2402 lines
80 KiB
C
2402 lines
80 KiB
C
/*
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* The simplest AC-3 encoder
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* Copyright (c) 2000 Fabrice Bellard
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* Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
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* Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* The simplest AC-3 encoder.
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*/
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//#define ASSERT_LEVEL 2
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#include <stdint.h>
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#include "libavutil/audioconvert.h"
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#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
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#include "libavutil/crc.h"
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#include "libavutil/opt.h"
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#include "avcodec.h"
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#include "put_bits.h"
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#include "dsputil.h"
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#include "ac3dsp.h"
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#include "ac3.h"
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#include "audioconvert.h"
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#include "fft.h"
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#include "ac3enc.h"
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#include "eac3enc.h"
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typedef struct AC3Mant {
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uint16_t *qmant1_ptr, *qmant2_ptr, *qmant4_ptr; ///< mantissa pointers for bap=1,2,4
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int mant1_cnt, mant2_cnt, mant4_cnt; ///< mantissa counts for bap=1,2,4
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} AC3Mant;
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#define CMIXLEV_NUM_OPTIONS 3
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static const float cmixlev_options[CMIXLEV_NUM_OPTIONS] = {
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LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB
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};
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#define SURMIXLEV_NUM_OPTIONS 3
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static const float surmixlev_options[SURMIXLEV_NUM_OPTIONS] = {
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LEVEL_MINUS_3DB, LEVEL_MINUS_6DB, LEVEL_ZERO
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};
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#define EXTMIXLEV_NUM_OPTIONS 8
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static const float extmixlev_options[EXTMIXLEV_NUM_OPTIONS] = {
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LEVEL_PLUS_3DB, LEVEL_PLUS_1POINT5DB, LEVEL_ONE, LEVEL_MINUS_4POINT5DB,
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LEVEL_MINUS_3DB, LEVEL_MINUS_4POINT5DB, LEVEL_MINUS_6DB, LEVEL_ZERO
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};
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/**
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* LUT for number of exponent groups.
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* exponent_group_tab[coupling][exponent strategy-1][number of coefficients]
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*/
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static uint8_t exponent_group_tab[2][3][256];
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/**
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* List of supported channel layouts.
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*/
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const int64_t ff_ac3_channel_layouts[19] = {
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AV_CH_LAYOUT_MONO,
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AV_CH_LAYOUT_STEREO,
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AV_CH_LAYOUT_2_1,
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AV_CH_LAYOUT_SURROUND,
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AV_CH_LAYOUT_2_2,
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AV_CH_LAYOUT_QUAD,
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AV_CH_LAYOUT_4POINT0,
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AV_CH_LAYOUT_5POINT0,
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AV_CH_LAYOUT_5POINT0_BACK,
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(AV_CH_LAYOUT_MONO | AV_CH_LOW_FREQUENCY),
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(AV_CH_LAYOUT_STEREO | AV_CH_LOW_FREQUENCY),
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(AV_CH_LAYOUT_2_1 | AV_CH_LOW_FREQUENCY),
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(AV_CH_LAYOUT_SURROUND | AV_CH_LOW_FREQUENCY),
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(AV_CH_LAYOUT_2_2 | AV_CH_LOW_FREQUENCY),
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(AV_CH_LAYOUT_QUAD | AV_CH_LOW_FREQUENCY),
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(AV_CH_LAYOUT_4POINT0 | AV_CH_LOW_FREQUENCY),
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AV_CH_LAYOUT_5POINT1,
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AV_CH_LAYOUT_5POINT1_BACK,
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0
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};
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/**
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* LUT to select the bandwidth code based on the bit rate, sample rate, and
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* number of full-bandwidth channels.
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* bandwidth_tab[fbw_channels-1][sample rate code][bit rate code]
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*/
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static const uint8_t ac3_bandwidth_tab[5][3][19] = {
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// 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640
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{ { 0, 0, 0, 12, 16, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
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{ 0, 0, 0, 16, 20, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
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{ 0, 0, 0, 32, 40, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
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{ { 0, 0, 0, 0, 0, 0, 0, 20, 24, 32, 48, 48, 48, 48, 48, 48, 48, 48, 48 },
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{ 0, 0, 0, 0, 0, 0, 4, 24, 28, 36, 56, 56, 56, 56, 56, 56, 56, 56, 56 },
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{ 0, 0, 0, 0, 0, 0, 20, 44, 52, 60, 60, 60, 60, 60, 60, 60, 60, 60, 60 } },
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{ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 24, 32, 40, 48, 48, 48, 48, 48, 48 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 4, 20, 28, 36, 44, 56, 56, 56, 56, 56, 56 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 20, 40, 48, 60, 60, 60, 60, 60, 60, 60, 60 } },
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{ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 32, 48, 48, 48, 48, 48, 48 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 28, 36, 56, 56, 56, 56, 56, 56 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 48, 60, 60, 60, 60, 60, 60, 60 } },
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{ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 20, 32, 40, 48, 48, 48, 48 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 24, 36, 44, 56, 56, 56, 56 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 44, 60, 60, 60, 60, 60, 60 } }
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};
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/**
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* LUT to select the coupling start band based on the bit rate, sample rate, and
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* number of full-bandwidth channels. -1 = coupling off
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* ac3_coupling_start_tab[channel_mode-2][sample rate code][bit rate code]
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*
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* TODO: more testing for optimal parameters.
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* multi-channel tests at 44.1kHz and 32kHz.
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*/
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static const int8_t ac3_coupling_start_tab[6][3][19] = {
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// 32 40 48 56 64 80 96 112 128 160 192 224 256 320 384 448 512 576 640
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// 2/0
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{ { 0, 0, 0, 0, 0, 0, 0, 1, 1, 7, 8, 11, 12, -1, -1, -1, -1, -1, -1 },
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{ 0, 0, 0, 0, 0, 0, 1, 3, 5, 7, 10, 12, 13, -1, -1, -1, -1, -1, -1 },
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{ 0, 0, 0, 0, 1, 2, 2, 9, 13, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
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// 3/0
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{ { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
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{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
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// 2/1 - untested
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{ { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 6, 9, 11, 12, 13, -1, -1, -1, -1 },
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{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
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// 3/1
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{ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
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{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
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// 2/2 - untested
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{ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 10, 11, 11, 12, 12, 14, -1 },
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{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
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// 3/2
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{ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 },
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 6, 8, 11, 12, 12, -1, -1 },
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{ -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 } },
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};
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/**
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* Adjust the frame size to make the average bit rate match the target bit rate.
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* This is only needed for 11025, 22050, and 44100 sample rates or any E-AC-3.
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*/
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static void adjust_frame_size(AC3EncodeContext *s)
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{
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while (s->bits_written >= s->bit_rate && s->samples_written >= s->sample_rate) {
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s->bits_written -= s->bit_rate;
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s->samples_written -= s->sample_rate;
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}
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s->frame_size = s->frame_size_min +
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2 * (s->bits_written * s->sample_rate < s->samples_written * s->bit_rate);
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s->bits_written += s->frame_size * 8;
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s->samples_written += AC3_FRAME_SIZE;
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}
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static void compute_coupling_strategy(AC3EncodeContext *s)
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{
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int blk, ch;
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int got_cpl_snr;
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/* set coupling use flags for each block/channel */
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/* TODO: turn coupling on/off and adjust start band based on bit usage */
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for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
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AC3Block *block = &s->blocks[blk];
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for (ch = 1; ch <= s->fbw_channels; ch++)
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block->channel_in_cpl[ch] = s->cpl_on;
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}
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/* enable coupling for each block if at least 2 channels have coupling
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enabled for that block */
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got_cpl_snr = 0;
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for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
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AC3Block *block = &s->blocks[blk];
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block->num_cpl_channels = 0;
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for (ch = 1; ch <= s->fbw_channels; ch++)
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block->num_cpl_channels += block->channel_in_cpl[ch];
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block->cpl_in_use = block->num_cpl_channels > 1;
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if (!block->cpl_in_use) {
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block->num_cpl_channels = 0;
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for (ch = 1; ch <= s->fbw_channels; ch++)
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block->channel_in_cpl[ch] = 0;
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}
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block->new_cpl_strategy = !blk;
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if (blk) {
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for (ch = 1; ch <= s->fbw_channels; ch++) {
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if (block->channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]) {
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block->new_cpl_strategy = 1;
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break;
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}
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}
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}
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block->new_cpl_leak = block->new_cpl_strategy;
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if (!blk || (block->cpl_in_use && !got_cpl_snr)) {
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block->new_snr_offsets = 1;
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if (block->cpl_in_use)
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got_cpl_snr = 1;
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} else {
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block->new_snr_offsets = 0;
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}
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}
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/* set bandwidth for each channel */
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for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
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AC3Block *block = &s->blocks[blk];
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for (ch = 1; ch <= s->fbw_channels; ch++) {
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if (block->channel_in_cpl[ch])
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block->end_freq[ch] = s->start_freq[CPL_CH];
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else
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block->end_freq[ch] = s->bandwidth_code * 3 + 73;
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}
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}
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}
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/**
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* Apply stereo rematrixing to coefficients based on rematrixing flags.
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*/
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static void apply_rematrixing(AC3EncodeContext *s)
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{
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int nb_coefs;
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int blk, bnd, i;
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int start, end;
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uint8_t *flags;
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if (!s->rematrixing_enabled)
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return;
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for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
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AC3Block *block = &s->blocks[blk];
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if (block->new_rematrixing_strategy)
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flags = block->rematrixing_flags;
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nb_coefs = FFMIN(block->end_freq[1], block->end_freq[2]);
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for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++) {
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if (flags[bnd]) {
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start = ff_ac3_rematrix_band_tab[bnd];
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end = FFMIN(nb_coefs, ff_ac3_rematrix_band_tab[bnd+1]);
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for (i = start; i < end; i++) {
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int32_t lt = block->fixed_coef[1][i];
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int32_t rt = block->fixed_coef[2][i];
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block->fixed_coef[1][i] = (lt + rt) >> 1;
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block->fixed_coef[2][i] = (lt - rt) >> 1;
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}
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}
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}
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}
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}
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/**
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* Initialize exponent tables.
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*/
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static av_cold void exponent_init(AC3EncodeContext *s)
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{
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int expstr, i, grpsize;
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for (expstr = EXP_D15-1; expstr <= EXP_D45-1; expstr++) {
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grpsize = 3 << expstr;
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for (i = 12; i < 256; i++) {
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exponent_group_tab[0][expstr][i] = (i + grpsize - 4) / grpsize;
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exponent_group_tab[1][expstr][i] = (i ) / grpsize;
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}
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}
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/* LFE */
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exponent_group_tab[0][0][7] = 2;
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}
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/**
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* Extract exponents from the MDCT coefficients.
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* This takes into account the normalization that was done to the input samples
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* by adjusting the exponents by the exponent shift values.
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*/
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static void extract_exponents(AC3EncodeContext *s)
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{
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int ch = !s->cpl_on;
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int chan_size = AC3_MAX_COEFS * AC3_MAX_BLOCKS * (s->channels - ch + 1);
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AC3Block *block = &s->blocks[0];
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s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch], chan_size);
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}
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/**
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* Exponent Difference Threshold.
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* New exponents are sent if their SAD exceed this number.
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*/
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#define EXP_DIFF_THRESHOLD 500
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/**
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* Calculate exponent strategies for all channels.
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* Array arrangement is reversed to simplify the per-channel calculation.
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*/
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static void compute_exp_strategy(AC3EncodeContext *s)
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{
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int ch, blk, blk1;
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for (ch = !s->cpl_on; ch <= s->fbw_channels; ch++) {
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uint8_t *exp_strategy = s->exp_strategy[ch];
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uint8_t *exp = s->blocks[0].exp[ch];
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int exp_diff;
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/* estimate if the exponent variation & decide if they should be
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reused in the next frame */
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exp_strategy[0] = EXP_NEW;
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exp += AC3_MAX_COEFS;
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for (blk = 1; blk < AC3_MAX_BLOCKS; blk++, exp += AC3_MAX_COEFS) {
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if ((ch == CPL_CH && (!s->blocks[blk].cpl_in_use || !s->blocks[blk-1].cpl_in_use)) ||
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(ch > CPL_CH && (s->blocks[blk].channel_in_cpl[ch] != s->blocks[blk-1].channel_in_cpl[ch]))) {
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exp_strategy[blk] = EXP_NEW;
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continue;
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}
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exp_diff = s->dsp.sad[0](NULL, exp, exp - AC3_MAX_COEFS, 16, 16);
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exp_strategy[blk] = EXP_REUSE;
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if (ch == CPL_CH && exp_diff > (EXP_DIFF_THRESHOLD * (s->blocks[blk].end_freq[ch] - s->start_freq[ch]) / AC3_MAX_COEFS))
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exp_strategy[blk] = EXP_NEW;
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else if (ch > CPL_CH && exp_diff > EXP_DIFF_THRESHOLD)
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exp_strategy[blk] = EXP_NEW;
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}
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/* now select the encoding strategy type : if exponents are often
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recoded, we use a coarse encoding */
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blk = 0;
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while (blk < AC3_MAX_BLOCKS) {
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blk1 = blk + 1;
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while (blk1 < AC3_MAX_BLOCKS && exp_strategy[blk1] == EXP_REUSE)
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blk1++;
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switch (blk1 - blk) {
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case 1: exp_strategy[blk] = EXP_D45; break;
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case 2:
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case 3: exp_strategy[blk] = EXP_D25; break;
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default: exp_strategy[blk] = EXP_D15; break;
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}
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blk = blk1;
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}
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}
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if (s->lfe_on) {
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ch = s->lfe_channel;
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s->exp_strategy[ch][0] = EXP_D15;
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for (blk = 1; blk < AC3_MAX_BLOCKS; blk++)
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s->exp_strategy[ch][blk] = EXP_REUSE;
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}
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}
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/**
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* Update the exponents so that they are the ones the decoder will decode.
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*/
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static void encode_exponents_blk_ch(uint8_t *exp, int nb_exps, int exp_strategy,
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int cpl)
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{
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int nb_groups, i, k;
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nb_groups = exponent_group_tab[cpl][exp_strategy-1][nb_exps] * 3;
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/* for each group, compute the minimum exponent */
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switch(exp_strategy) {
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case EXP_D25:
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for (i = 1, k = 1-cpl; i <= nb_groups; i++) {
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uint8_t exp_min = exp[k];
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if (exp[k+1] < exp_min)
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exp_min = exp[k+1];
|
|
exp[i-cpl] = exp_min;
|
|
k += 2;
|
|
}
|
|
break;
|
|
case EXP_D45:
|
|
for (i = 1, k = 1-cpl; i <= nb_groups; i++) {
|
|
uint8_t exp_min = exp[k];
|
|
if (exp[k+1] < exp_min)
|
|
exp_min = exp[k+1];
|
|
if (exp[k+2] < exp_min)
|
|
exp_min = exp[k+2];
|
|
if (exp[k+3] < exp_min)
|
|
exp_min = exp[k+3];
|
|
exp[i-cpl] = exp_min;
|
|
k += 4;
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* constraint for DC exponent */
|
|
if (!cpl && exp[0] > 15)
|
|
exp[0] = 15;
|
|
|
|
/* decrease the delta between each groups to within 2 so that they can be
|
|
differentially encoded */
|
|
for (i = 1; i <= nb_groups; i++)
|
|
exp[i] = FFMIN(exp[i], exp[i-1] + 2);
|
|
i--;
|
|
while (--i >= 0)
|
|
exp[i] = FFMIN(exp[i], exp[i+1] + 2);
|
|
|
|
if (cpl)
|
|
exp[-1] = exp[0] & ~1;
|
|
|
|
/* now we have the exponent values the decoder will see */
|
|
switch (exp_strategy) {
|
|
case EXP_D25:
|
|
for (i = nb_groups, k = (nb_groups * 2)-cpl; i > 0; i--) {
|
|
uint8_t exp1 = exp[i-cpl];
|
|
exp[k--] = exp1;
|
|
exp[k--] = exp1;
|
|
}
|
|
break;
|
|
case EXP_D45:
|
|
for (i = nb_groups, k = (nb_groups * 4)-cpl; i > 0; i--) {
|
|
exp[k] = exp[k-1] = exp[k-2] = exp[k-3] = exp[i-cpl];
|
|
k -= 4;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Encode exponents from original extracted form to what the decoder will see.
|
|
* This copies and groups exponents based on exponent strategy and reduces
|
|
* deltas between adjacent exponent groups so that they can be differentially
|
|
* encoded.
|
|
*/
|
|
static void encode_exponents(AC3EncodeContext *s)
|
|
{
|
|
int blk, blk1, ch, cpl;
|
|
uint8_t *exp, *exp_strategy;
|
|
int nb_coefs, num_reuse_blocks;
|
|
|
|
for (ch = !s->cpl_on; ch <= s->channels; ch++) {
|
|
exp = s->blocks[0].exp[ch] + s->start_freq[ch];
|
|
exp_strategy = s->exp_strategy[ch];
|
|
|
|
cpl = (ch == CPL_CH);
|
|
blk = 0;
|
|
while (blk < AC3_MAX_BLOCKS) {
|
|
AC3Block *block = &s->blocks[blk];
|
|
if (cpl && !block->cpl_in_use) {
|
|
exp += AC3_MAX_COEFS;
|
|
blk++;
|
|
continue;
|
|
}
|
|
nb_coefs = block->end_freq[ch] - s->start_freq[ch];
|
|
blk1 = blk + 1;
|
|
|
|
/* count the number of EXP_REUSE blocks after the current block
|
|
and set exponent reference block numbers */
|
|
s->exp_ref_block[ch][blk] = blk;
|
|
while (blk1 < AC3_MAX_BLOCKS && exp_strategy[blk1] == EXP_REUSE) {
|
|
s->exp_ref_block[ch][blk1] = blk;
|
|
blk1++;
|
|
}
|
|
num_reuse_blocks = blk1 - blk - 1;
|
|
|
|
/* for the EXP_REUSE case we select the min of the exponents */
|
|
s->ac3dsp.ac3_exponent_min(exp-s->start_freq[ch], num_reuse_blocks,
|
|
AC3_MAX_COEFS);
|
|
|
|
encode_exponents_blk_ch(exp, nb_coefs, exp_strategy[blk], cpl);
|
|
|
|
exp += AC3_MAX_COEFS * (num_reuse_blocks + 1);
|
|
blk = blk1;
|
|
}
|
|
}
|
|
|
|
/* reference block numbers have been changed, so reset ref_bap_set */
|
|
s->ref_bap_set = 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* Group exponents.
|
|
* 3 delta-encoded exponents are in each 7-bit group. The number of groups
|
|
* varies depending on exponent strategy and bandwidth.
|
|
*/
|
|
static void group_exponents(AC3EncodeContext *s)
|
|
{
|
|
int blk, ch, i, cpl;
|
|
int group_size, nb_groups, bit_count;
|
|
uint8_t *p;
|
|
int delta0, delta1, delta2;
|
|
int exp0, exp1;
|
|
|
|
bit_count = 0;
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
|
|
AC3Block *block = &s->blocks[blk];
|
|
for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
|
|
int exp_strategy = s->exp_strategy[ch][blk];
|
|
if (exp_strategy == EXP_REUSE)
|
|
continue;
|
|
cpl = (ch == CPL_CH);
|
|
group_size = exp_strategy + (exp_strategy == EXP_D45);
|
|
nb_groups = exponent_group_tab[cpl][exp_strategy-1][block->end_freq[ch]-s->start_freq[ch]];
|
|
bit_count += 4 + (nb_groups * 7);
|
|
p = block->exp[ch] + s->start_freq[ch] - cpl;
|
|
|
|
/* DC exponent */
|
|
exp1 = *p++;
|
|
block->grouped_exp[ch][0] = exp1;
|
|
|
|
/* remaining exponents are delta encoded */
|
|
for (i = 1; i <= nb_groups; i++) {
|
|
/* merge three delta in one code */
|
|
exp0 = exp1;
|
|
exp1 = p[0];
|
|
p += group_size;
|
|
delta0 = exp1 - exp0 + 2;
|
|
av_assert2(delta0 >= 0 && delta0 <= 4);
|
|
|
|
exp0 = exp1;
|
|
exp1 = p[0];
|
|
p += group_size;
|
|
delta1 = exp1 - exp0 + 2;
|
|
av_assert2(delta1 >= 0 && delta1 <= 4);
|
|
|
|
exp0 = exp1;
|
|
exp1 = p[0];
|
|
p += group_size;
|
|
delta2 = exp1 - exp0 + 2;
|
|
av_assert2(delta2 >= 0 && delta2 <= 4);
|
|
|
|
block->grouped_exp[ch][i] = ((delta0 * 5 + delta1) * 5) + delta2;
|
|
}
|
|
}
|
|
}
|
|
|
|
s->exponent_bits = bit_count;
|
|
}
|
|
|
|
|
|
/**
|
|
* Calculate final exponents from the supplied MDCT coefficients and exponent shift.
|
|
* Extract exponents from MDCT coefficients, calculate exponent strategies,
|
|
* and encode final exponents.
|
|
*/
|
|
static void process_exponents(AC3EncodeContext *s)
|
|
{
|
|
extract_exponents(s);
|
|
|
|
compute_exp_strategy(s);
|
|
|
|
encode_exponents(s);
|
|
|
|
group_exponents(s);
|
|
|
|
emms_c();
|
|
}
|
|
|
|
|
|
/**
|
|
* Count frame bits that are based solely on fixed parameters.
|
|
* This only has to be run once when the encoder is initialized.
|
|
*/
|
|
static void count_frame_bits_fixed(AC3EncodeContext *s)
|
|
{
|
|
static const int frame_bits_inc[8] = { 0, 0, 2, 2, 2, 4, 2, 4 };
|
|
int blk;
|
|
int frame_bits;
|
|
|
|
/* assumptions:
|
|
* no dynamic range codes
|
|
* bit allocation parameters do not change between blocks
|
|
* no delta bit allocation
|
|
* no skipped data
|
|
* no auxilliary data
|
|
* no E-AC-3 metadata
|
|
*/
|
|
|
|
/* header */
|
|
frame_bits = 16; /* sync info */
|
|
if (s->eac3) {
|
|
/* bitstream info header */
|
|
frame_bits += 35;
|
|
frame_bits += 1 + 1 + 1;
|
|
/* audio frame header */
|
|
frame_bits += 2;
|
|
frame_bits += 10;
|
|
/* exponent strategy */
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
|
|
frame_bits += 2 * s->fbw_channels + s->lfe_on;
|
|
/* converter exponent strategy */
|
|
frame_bits += s->fbw_channels * 5;
|
|
/* snr offsets */
|
|
frame_bits += 10;
|
|
/* block start info */
|
|
frame_bits++;
|
|
} else {
|
|
frame_bits += 49;
|
|
frame_bits += frame_bits_inc[s->channel_mode];
|
|
}
|
|
|
|
/* audio blocks */
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
|
|
if (!s->eac3) {
|
|
/* block switch flags */
|
|
frame_bits += s->fbw_channels;
|
|
|
|
/* dither flags */
|
|
frame_bits += s->fbw_channels;
|
|
}
|
|
|
|
/* dynamic range */
|
|
frame_bits++;
|
|
|
|
/* spectral extension */
|
|
if (s->eac3)
|
|
frame_bits++;
|
|
|
|
if (!s->eac3) {
|
|
/* exponent strategy */
|
|
frame_bits += 2 * s->fbw_channels;
|
|
if (s->lfe_on)
|
|
frame_bits++;
|
|
|
|
/* bit allocation params */
|
|
frame_bits++;
|
|
if (!blk)
|
|
frame_bits += 2 + 2 + 2 + 2 + 3;
|
|
}
|
|
|
|
/* converter snr offset */
|
|
if (s->eac3)
|
|
frame_bits++;
|
|
|
|
if (!s->eac3) {
|
|
/* delta bit allocation */
|
|
frame_bits++;
|
|
|
|
/* skipped data */
|
|
frame_bits++;
|
|
}
|
|
}
|
|
|
|
/* auxiliary data */
|
|
frame_bits++;
|
|
|
|
/* CRC */
|
|
frame_bits += 1 + 16;
|
|
|
|
s->frame_bits_fixed = frame_bits;
|
|
}
|
|
|
|
|
|
/**
|
|
* Initialize bit allocation.
|
|
* Set default parameter codes and calculate parameter values.
|
|
*/
|
|
static void bit_alloc_init(AC3EncodeContext *s)
|
|
{
|
|
int ch;
|
|
|
|
/* init default parameters */
|
|
s->slow_decay_code = 2;
|
|
s->fast_decay_code = 1;
|
|
s->slow_gain_code = 1;
|
|
s->db_per_bit_code = s->eac3 ? 2 : 3;
|
|
s->floor_code = 7;
|
|
for (ch = 0; ch <= s->channels; ch++)
|
|
s->fast_gain_code[ch] = 4;
|
|
|
|
/* initial snr offset */
|
|
s->coarse_snr_offset = 40;
|
|
|
|
/* compute real values */
|
|
/* currently none of these values change during encoding, so we can just
|
|
set them once at initialization */
|
|
s->bit_alloc.slow_decay = ff_ac3_slow_decay_tab[s->slow_decay_code] >> s->bit_alloc.sr_shift;
|
|
s->bit_alloc.fast_decay = ff_ac3_fast_decay_tab[s->fast_decay_code] >> s->bit_alloc.sr_shift;
|
|
s->bit_alloc.slow_gain = ff_ac3_slow_gain_tab[s->slow_gain_code];
|
|
s->bit_alloc.db_per_bit = ff_ac3_db_per_bit_tab[s->db_per_bit_code];
|
|
s->bit_alloc.floor = ff_ac3_floor_tab[s->floor_code];
|
|
s->bit_alloc.cpl_fast_leak = 0;
|
|
s->bit_alloc.cpl_slow_leak = 0;
|
|
|
|
count_frame_bits_fixed(s);
|
|
}
|
|
|
|
|
|
/**
|
|
* Count the bits used to encode the frame, minus exponents and mantissas.
|
|
* Bits based on fixed parameters have already been counted, so now we just
|
|
* have to add the bits based on parameters that change during encoding.
|
|
*/
|
|
static void count_frame_bits(AC3EncodeContext *s)
|
|
{
|
|
AC3EncOptions *opt = &s->options;
|
|
int blk, ch;
|
|
int frame_bits = 0;
|
|
|
|
/* header */
|
|
if (s->eac3) {
|
|
/* coupling */
|
|
if (s->channel_mode > AC3_CHMODE_MONO) {
|
|
frame_bits++;
|
|
for (blk = 1; blk < AC3_MAX_BLOCKS; blk++) {
|
|
AC3Block *block = &s->blocks[blk];
|
|
frame_bits++;
|
|
if (block->new_cpl_strategy)
|
|
frame_bits++;
|
|
}
|
|
}
|
|
/* coupling exponent strategy */
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
|
|
frame_bits += 2 * s->blocks[blk].cpl_in_use;
|
|
} else {
|
|
if (opt->audio_production_info)
|
|
frame_bits += 7;
|
|
if (s->bitstream_id == 6) {
|
|
if (opt->extended_bsi_1)
|
|
frame_bits += 14;
|
|
if (opt->extended_bsi_2)
|
|
frame_bits += 14;
|
|
}
|
|
}
|
|
|
|
/* audio blocks */
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
|
|
AC3Block *block = &s->blocks[blk];
|
|
|
|
/* coupling strategy */
|
|
if (!s->eac3)
|
|
frame_bits++;
|
|
if (block->new_cpl_strategy) {
|
|
if (!s->eac3)
|
|
frame_bits++;
|
|
if (block->cpl_in_use) {
|
|
if (s->eac3)
|
|
frame_bits++;
|
|
if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO)
|
|
frame_bits += s->fbw_channels;
|
|
if (s->channel_mode == AC3_CHMODE_STEREO)
|
|
frame_bits++;
|
|
frame_bits += 4 + 4;
|
|
if (s->eac3)
|
|
frame_bits++;
|
|
else
|
|
frame_bits += s->num_cpl_subbands - 1;
|
|
}
|
|
}
|
|
|
|
/* coupling coordinates */
|
|
if (block->cpl_in_use) {
|
|
for (ch = 1; ch <= s->fbw_channels; ch++) {
|
|
if (block->channel_in_cpl[ch]) {
|
|
if (!s->eac3 || block->new_cpl_coords != 2)
|
|
frame_bits++;
|
|
if (block->new_cpl_coords) {
|
|
frame_bits += 2;
|
|
frame_bits += (4 + 4) * s->num_cpl_bands;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* stereo rematrixing */
|
|
if (s->channel_mode == AC3_CHMODE_STEREO) {
|
|
if (!s->eac3 || blk > 0)
|
|
frame_bits++;
|
|
if (s->blocks[blk].new_rematrixing_strategy)
|
|
frame_bits += block->num_rematrixing_bands;
|
|
}
|
|
|
|
/* bandwidth codes & gain range */
|
|
for (ch = 1; ch <= s->fbw_channels; ch++) {
|
|
if (s->exp_strategy[ch][blk] != EXP_REUSE) {
|
|
if (!block->channel_in_cpl[ch])
|
|
frame_bits += 6;
|
|
frame_bits += 2;
|
|
}
|
|
}
|
|
|
|
/* coupling exponent strategy */
|
|
if (!s->eac3 && block->cpl_in_use)
|
|
frame_bits += 2;
|
|
|
|
/* snr offsets and fast gain codes */
|
|
if (!s->eac3) {
|
|
frame_bits++;
|
|
if (block->new_snr_offsets)
|
|
frame_bits += 6 + (s->channels + block->cpl_in_use) * (4 + 3);
|
|
}
|
|
|
|
/* coupling leak info */
|
|
if (block->cpl_in_use) {
|
|
if (!s->eac3 || block->new_cpl_leak != 2)
|
|
frame_bits++;
|
|
if (block->new_cpl_leak)
|
|
frame_bits += 3 + 3;
|
|
}
|
|
}
|
|
|
|
s->frame_bits = s->frame_bits_fixed + frame_bits;
|
|
}
|
|
|
|
|
|
/**
|
|
* Calculate masking curve based on the final exponents.
|
|
* Also calculate the power spectral densities to use in future calculations.
|
|
*/
|
|
static void bit_alloc_masking(AC3EncodeContext *s)
|
|
{
|
|
int blk, ch;
|
|
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
|
|
AC3Block *block = &s->blocks[blk];
|
|
for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
|
|
/* We only need psd and mask for calculating bap.
|
|
Since we currently do not calculate bap when exponent
|
|
strategy is EXP_REUSE we do not need to calculate psd or mask. */
|
|
if (s->exp_strategy[ch][blk] != EXP_REUSE) {
|
|
ff_ac3_bit_alloc_calc_psd(block->exp[ch], s->start_freq[ch],
|
|
block->end_freq[ch], block->psd[ch],
|
|
block->band_psd[ch]);
|
|
ff_ac3_bit_alloc_calc_mask(&s->bit_alloc, block->band_psd[ch],
|
|
s->start_freq[ch], block->end_freq[ch],
|
|
ff_ac3_fast_gain_tab[s->fast_gain_code[ch]],
|
|
ch == s->lfe_channel,
|
|
DBA_NONE, 0, NULL, NULL, NULL,
|
|
block->mask[ch]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Ensure that bap for each block and channel point to the current bap_buffer.
|
|
* They may have been switched during the bit allocation search.
|
|
*/
|
|
static void reset_block_bap(AC3EncodeContext *s)
|
|
{
|
|
int blk, ch;
|
|
uint8_t *ref_bap;
|
|
|
|
if (s->ref_bap[0][0] == s->bap_buffer && s->ref_bap_set)
|
|
return;
|
|
|
|
ref_bap = s->bap_buffer;
|
|
for (ch = 0; ch <= s->channels; ch++) {
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
|
|
s->ref_bap[ch][blk] = ref_bap + AC3_MAX_COEFS * s->exp_ref_block[ch][blk];
|
|
ref_bap += AC3_MAX_COEFS * AC3_MAX_BLOCKS;
|
|
}
|
|
s->ref_bap_set = 1;
|
|
}
|
|
|
|
|
|
/**
|
|
* Initialize mantissa counts.
|
|
* These are set so that they are padded to the next whole group size when bits
|
|
* are counted in compute_mantissa_size.
|
|
*/
|
|
static void count_mantissa_bits_init(uint16_t mant_cnt[AC3_MAX_BLOCKS][16])
|
|
{
|
|
int blk;
|
|
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
|
|
memset(mant_cnt[blk], 0, sizeof(mant_cnt[blk]));
|
|
mant_cnt[blk][1] = mant_cnt[blk][2] = 2;
|
|
mant_cnt[blk][4] = 1;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Update mantissa bit counts for all blocks in 1 channel in a given bandwidth
|
|
* range.
|
|
*/
|
|
static void count_mantissa_bits_update_ch(AC3EncodeContext *s, int ch,
|
|
uint16_t mant_cnt[AC3_MAX_BLOCKS][16],
|
|
int start, int end)
|
|
{
|
|
int blk;
|
|
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
|
|
AC3Block *block = &s->blocks[blk];
|
|
if (ch == CPL_CH && !block->cpl_in_use)
|
|
continue;
|
|
s->ac3dsp.update_bap_counts(mant_cnt[blk],
|
|
s->ref_bap[ch][blk] + start,
|
|
FFMIN(end, block->end_freq[ch]) - start);
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Count the number of mantissa bits in the frame based on the bap values.
|
|
*/
|
|
static int count_mantissa_bits(AC3EncodeContext *s)
|
|
{
|
|
int ch, max_end_freq;
|
|
LOCAL_ALIGNED_16(uint16_t, mant_cnt, [AC3_MAX_BLOCKS], [16]);
|
|
|
|
count_mantissa_bits_init(mant_cnt);
|
|
|
|
max_end_freq = s->bandwidth_code * 3 + 73;
|
|
for (ch = !s->cpl_enabled; ch <= s->channels; ch++)
|
|
count_mantissa_bits_update_ch(s, ch, mant_cnt, s->start_freq[ch],
|
|
max_end_freq);
|
|
|
|
return s->ac3dsp.compute_mantissa_size(mant_cnt);
|
|
}
|
|
|
|
|
|
/**
|
|
* Run the bit allocation with a given SNR offset.
|
|
* This calculates the bit allocation pointers that will be used to determine
|
|
* the quantization of each mantissa.
|
|
* @return the number of bits needed for mantissas if the given SNR offset is
|
|
* is used.
|
|
*/
|
|
static int bit_alloc(AC3EncodeContext *s, int snr_offset)
|
|
{
|
|
int blk, ch;
|
|
|
|
snr_offset = (snr_offset - 240) << 2;
|
|
|
|
reset_block_bap(s);
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
|
|
AC3Block *block = &s->blocks[blk];
|
|
|
|
for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
|
|
/* Currently the only bit allocation parameters which vary across
|
|
blocks within a frame are the exponent values. We can take
|
|
advantage of that by reusing the bit allocation pointers
|
|
whenever we reuse exponents. */
|
|
if (s->exp_strategy[ch][blk] != EXP_REUSE) {
|
|
s->ac3dsp.bit_alloc_calc_bap(block->mask[ch], block->psd[ch],
|
|
s->start_freq[ch], block->end_freq[ch],
|
|
snr_offset, s->bit_alloc.floor,
|
|
ff_ac3_bap_tab, s->ref_bap[ch][blk]);
|
|
}
|
|
}
|
|
}
|
|
return count_mantissa_bits(s);
|
|
}
|
|
|
|
|
|
/**
|
|
* Constant bitrate bit allocation search.
|
|
* Find the largest SNR offset that will allow data to fit in the frame.
|
|
*/
|
|
static int cbr_bit_allocation(AC3EncodeContext *s)
|
|
{
|
|
int ch;
|
|
int bits_left;
|
|
int snr_offset, snr_incr;
|
|
|
|
bits_left = 8 * s->frame_size - (s->frame_bits + s->exponent_bits);
|
|
if (bits_left < 0)
|
|
return AVERROR(EINVAL);
|
|
|
|
snr_offset = s->coarse_snr_offset << 4;
|
|
|
|
/* if previous frame SNR offset was 1023, check if current frame can also
|
|
use SNR offset of 1023. if so, skip the search. */
|
|
if ((snr_offset | s->fine_snr_offset[1]) == 1023) {
|
|
if (bit_alloc(s, 1023) <= bits_left)
|
|
return 0;
|
|
}
|
|
|
|
while (snr_offset >= 0 &&
|
|
bit_alloc(s, snr_offset) > bits_left) {
|
|
snr_offset -= 64;
|
|
}
|
|
if (snr_offset < 0)
|
|
return AVERROR(EINVAL);
|
|
|
|
FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
|
|
for (snr_incr = 64; snr_incr > 0; snr_incr >>= 2) {
|
|
while (snr_offset + snr_incr <= 1023 &&
|
|
bit_alloc(s, snr_offset + snr_incr) <= bits_left) {
|
|
snr_offset += snr_incr;
|
|
FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
|
|
}
|
|
}
|
|
FFSWAP(uint8_t *, s->bap_buffer, s->bap1_buffer);
|
|
reset_block_bap(s);
|
|
|
|
s->coarse_snr_offset = snr_offset >> 4;
|
|
for (ch = !s->cpl_on; ch <= s->channels; ch++)
|
|
s->fine_snr_offset[ch] = snr_offset & 0xF;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* Downgrade exponent strategies to reduce the bits used by the exponents.
|
|
* This is a fallback for when bit allocation fails with the normal exponent
|
|
* strategies. Each time this function is run it only downgrades the
|
|
* strategy in 1 channel of 1 block.
|
|
* @return non-zero if downgrade was unsuccessful
|
|
*/
|
|
static int downgrade_exponents(AC3EncodeContext *s)
|
|
{
|
|
int ch, blk;
|
|
|
|
for (blk = AC3_MAX_BLOCKS-1; blk >= 0; blk--) {
|
|
for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++) {
|
|
if (s->exp_strategy[ch][blk] == EXP_D15) {
|
|
s->exp_strategy[ch][blk] = EXP_D25;
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
for (blk = AC3_MAX_BLOCKS-1; blk >= 0; blk--) {
|
|
for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++) {
|
|
if (s->exp_strategy[ch][blk] == EXP_D25) {
|
|
s->exp_strategy[ch][blk] = EXP_D45;
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
/* block 0 cannot reuse exponents, so only downgrade D45 to REUSE if
|
|
the block number > 0 */
|
|
for (blk = AC3_MAX_BLOCKS-1; blk > 0; blk--) {
|
|
for (ch = !s->blocks[blk].cpl_in_use; ch <= s->fbw_channels; ch++) {
|
|
if (s->exp_strategy[ch][blk] > EXP_REUSE) {
|
|
s->exp_strategy[ch][blk] = EXP_REUSE;
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
|
|
/**
|
|
* Perform bit allocation search.
|
|
* Finds the SNR offset value that maximizes quality and fits in the specified
|
|
* frame size. Output is the SNR offset and a set of bit allocation pointers
|
|
* used to quantize the mantissas.
|
|
*/
|
|
static int compute_bit_allocation(AC3EncodeContext *s)
|
|
{
|
|
int ret;
|
|
|
|
count_frame_bits(s);
|
|
|
|
bit_alloc_masking(s);
|
|
|
|
ret = cbr_bit_allocation(s);
|
|
while (ret) {
|
|
/* fallback 1: disable channel coupling */
|
|
if (s->cpl_on) {
|
|
s->cpl_on = 0;
|
|
compute_coupling_strategy(s);
|
|
s->compute_rematrixing_strategy(s);
|
|
apply_rematrixing(s);
|
|
process_exponents(s);
|
|
ret = compute_bit_allocation(s);
|
|
continue;
|
|
}
|
|
|
|
/* fallback 2: downgrade exponents */
|
|
if (!downgrade_exponents(s)) {
|
|
extract_exponents(s);
|
|
encode_exponents(s);
|
|
group_exponents(s);
|
|
ret = compute_bit_allocation(s);
|
|
continue;
|
|
}
|
|
|
|
/* fallbacks were not enough... */
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* Symmetric quantization on 'levels' levels.
|
|
*/
|
|
static inline int sym_quant(int c, int e, int levels)
|
|
{
|
|
int v = (((levels * c) >> (24 - e)) + levels) >> 1;
|
|
av_assert2(v >= 0 && v < levels);
|
|
return v;
|
|
}
|
|
|
|
|
|
/**
|
|
* Asymmetric quantization on 2^qbits levels.
|
|
*/
|
|
static inline int asym_quant(int c, int e, int qbits)
|
|
{
|
|
int lshift, m, v;
|
|
|
|
lshift = e + qbits - 24;
|
|
if (lshift >= 0)
|
|
v = c << lshift;
|
|
else
|
|
v = c >> (-lshift);
|
|
/* rounding */
|
|
v = (v + 1) >> 1;
|
|
m = (1 << (qbits-1));
|
|
if (v >= m)
|
|
v = m - 1;
|
|
av_assert2(v >= -m);
|
|
return v & ((1 << qbits)-1);
|
|
}
|
|
|
|
|
|
/**
|
|
* Quantize a set of mantissas for a single channel in a single block.
|
|
*/
|
|
static void quantize_mantissas_blk_ch(AC3Mant *s, int32_t *fixed_coef,
|
|
uint8_t *exp, uint8_t *bap,
|
|
uint16_t *qmant, int start_freq,
|
|
int end_freq)
|
|
{
|
|
int i;
|
|
|
|
for (i = start_freq; i < end_freq; i++) {
|
|
int v;
|
|
int c = fixed_coef[i];
|
|
int e = exp[i];
|
|
int b = bap[i];
|
|
switch (b) {
|
|
case 0:
|
|
v = 0;
|
|
break;
|
|
case 1:
|
|
v = sym_quant(c, e, 3);
|
|
switch (s->mant1_cnt) {
|
|
case 0:
|
|
s->qmant1_ptr = &qmant[i];
|
|
v = 9 * v;
|
|
s->mant1_cnt = 1;
|
|
break;
|
|
case 1:
|
|
*s->qmant1_ptr += 3 * v;
|
|
s->mant1_cnt = 2;
|
|
v = 128;
|
|
break;
|
|
default:
|
|
*s->qmant1_ptr += v;
|
|
s->mant1_cnt = 0;
|
|
v = 128;
|
|
break;
|
|
}
|
|
break;
|
|
case 2:
|
|
v = sym_quant(c, e, 5);
|
|
switch (s->mant2_cnt) {
|
|
case 0:
|
|
s->qmant2_ptr = &qmant[i];
|
|
v = 25 * v;
|
|
s->mant2_cnt = 1;
|
|
break;
|
|
case 1:
|
|
*s->qmant2_ptr += 5 * v;
|
|
s->mant2_cnt = 2;
|
|
v = 128;
|
|
break;
|
|
default:
|
|
*s->qmant2_ptr += v;
|
|
s->mant2_cnt = 0;
|
|
v = 128;
|
|
break;
|
|
}
|
|
break;
|
|
case 3:
|
|
v = sym_quant(c, e, 7);
|
|
break;
|
|
case 4:
|
|
v = sym_quant(c, e, 11);
|
|
switch (s->mant4_cnt) {
|
|
case 0:
|
|
s->qmant4_ptr = &qmant[i];
|
|
v = 11 * v;
|
|
s->mant4_cnt = 1;
|
|
break;
|
|
default:
|
|
*s->qmant4_ptr += v;
|
|
s->mant4_cnt = 0;
|
|
v = 128;
|
|
break;
|
|
}
|
|
break;
|
|
case 5:
|
|
v = sym_quant(c, e, 15);
|
|
break;
|
|
case 14:
|
|
v = asym_quant(c, e, 14);
|
|
break;
|
|
case 15:
|
|
v = asym_quant(c, e, 16);
|
|
break;
|
|
default:
|
|
v = asym_quant(c, e, b - 1);
|
|
break;
|
|
}
|
|
qmant[i] = v;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Quantize mantissas using coefficients, exponents, and bit allocation pointers.
|
|
*/
|
|
static void quantize_mantissas(AC3EncodeContext *s)
|
|
{
|
|
int blk, ch, ch0=0, got_cpl;
|
|
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
|
|
AC3Block *block = &s->blocks[blk];
|
|
AC3Mant m = { 0 };
|
|
|
|
got_cpl = !block->cpl_in_use;
|
|
for (ch = 1; ch <= s->channels; ch++) {
|
|
if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
|
|
ch0 = ch - 1;
|
|
ch = CPL_CH;
|
|
got_cpl = 1;
|
|
}
|
|
quantize_mantissas_blk_ch(&m, block->fixed_coef[ch],
|
|
s->blocks[s->exp_ref_block[ch][blk]].exp[ch],
|
|
s->ref_bap[ch][blk], block->qmant[ch],
|
|
s->start_freq[ch], block->end_freq[ch]);
|
|
if (ch == CPL_CH)
|
|
ch = ch0;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Write the AC-3 frame header to the output bitstream.
|
|
*/
|
|
static void ac3_output_frame_header(AC3EncodeContext *s)
|
|
{
|
|
AC3EncOptions *opt = &s->options;
|
|
|
|
put_bits(&s->pb, 16, 0x0b77); /* frame header */
|
|
put_bits(&s->pb, 16, 0); /* crc1: will be filled later */
|
|
put_bits(&s->pb, 2, s->bit_alloc.sr_code);
|
|
put_bits(&s->pb, 6, s->frame_size_code + (s->frame_size - s->frame_size_min) / 2);
|
|
put_bits(&s->pb, 5, s->bitstream_id);
|
|
put_bits(&s->pb, 3, s->bitstream_mode);
|
|
put_bits(&s->pb, 3, s->channel_mode);
|
|
if ((s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO)
|
|
put_bits(&s->pb, 2, s->center_mix_level);
|
|
if (s->channel_mode & 0x04)
|
|
put_bits(&s->pb, 2, s->surround_mix_level);
|
|
if (s->channel_mode == AC3_CHMODE_STEREO)
|
|
put_bits(&s->pb, 2, opt->dolby_surround_mode);
|
|
put_bits(&s->pb, 1, s->lfe_on); /* LFE */
|
|
put_bits(&s->pb, 5, -opt->dialogue_level);
|
|
put_bits(&s->pb, 1, 0); /* no compression control word */
|
|
put_bits(&s->pb, 1, 0); /* no lang code */
|
|
put_bits(&s->pb, 1, opt->audio_production_info);
|
|
if (opt->audio_production_info) {
|
|
put_bits(&s->pb, 5, opt->mixing_level - 80);
|
|
put_bits(&s->pb, 2, opt->room_type);
|
|
}
|
|
put_bits(&s->pb, 1, opt->copyright);
|
|
put_bits(&s->pb, 1, opt->original);
|
|
if (s->bitstream_id == 6) {
|
|
/* alternate bit stream syntax */
|
|
put_bits(&s->pb, 1, opt->extended_bsi_1);
|
|
if (opt->extended_bsi_1) {
|
|
put_bits(&s->pb, 2, opt->preferred_stereo_downmix);
|
|
put_bits(&s->pb, 3, s->ltrt_center_mix_level);
|
|
put_bits(&s->pb, 3, s->ltrt_surround_mix_level);
|
|
put_bits(&s->pb, 3, s->loro_center_mix_level);
|
|
put_bits(&s->pb, 3, s->loro_surround_mix_level);
|
|
}
|
|
put_bits(&s->pb, 1, opt->extended_bsi_2);
|
|
if (opt->extended_bsi_2) {
|
|
put_bits(&s->pb, 2, opt->dolby_surround_ex_mode);
|
|
put_bits(&s->pb, 2, opt->dolby_headphone_mode);
|
|
put_bits(&s->pb, 1, opt->ad_converter_type);
|
|
put_bits(&s->pb, 9, 0); /* xbsi2 and encinfo : reserved */
|
|
}
|
|
} else {
|
|
put_bits(&s->pb, 1, 0); /* no time code 1 */
|
|
put_bits(&s->pb, 1, 0); /* no time code 2 */
|
|
}
|
|
put_bits(&s->pb, 1, 0); /* no additional bit stream info */
|
|
}
|
|
|
|
|
|
/**
|
|
* Write one audio block to the output bitstream.
|
|
*/
|
|
static void output_audio_block(AC3EncodeContext *s, int blk)
|
|
{
|
|
int ch, i, baie, bnd, got_cpl;
|
|
int av_uninit(ch0);
|
|
AC3Block *block = &s->blocks[blk];
|
|
|
|
/* block switching */
|
|
if (!s->eac3) {
|
|
for (ch = 0; ch < s->fbw_channels; ch++)
|
|
put_bits(&s->pb, 1, 0);
|
|
}
|
|
|
|
/* dither flags */
|
|
if (!s->eac3) {
|
|
for (ch = 0; ch < s->fbw_channels; ch++)
|
|
put_bits(&s->pb, 1, 1);
|
|
}
|
|
|
|
/* dynamic range codes */
|
|
put_bits(&s->pb, 1, 0);
|
|
|
|
/* spectral extension */
|
|
if (s->eac3)
|
|
put_bits(&s->pb, 1, 0);
|
|
|
|
/* channel coupling */
|
|
if (!s->eac3)
|
|
put_bits(&s->pb, 1, block->new_cpl_strategy);
|
|
if (block->new_cpl_strategy) {
|
|
if (!s->eac3)
|
|
put_bits(&s->pb, 1, block->cpl_in_use);
|
|
if (block->cpl_in_use) {
|
|
int start_sub, end_sub;
|
|
if (s->eac3)
|
|
put_bits(&s->pb, 1, 0); /* enhanced coupling */
|
|
if (!s->eac3 || s->channel_mode != AC3_CHMODE_STEREO) {
|
|
for (ch = 1; ch <= s->fbw_channels; ch++)
|
|
put_bits(&s->pb, 1, block->channel_in_cpl[ch]);
|
|
}
|
|
if (s->channel_mode == AC3_CHMODE_STEREO)
|
|
put_bits(&s->pb, 1, 0); /* phase flags in use */
|
|
start_sub = (s->start_freq[CPL_CH] - 37) / 12;
|
|
end_sub = (s->cpl_end_freq - 37) / 12;
|
|
put_bits(&s->pb, 4, start_sub);
|
|
put_bits(&s->pb, 4, end_sub - 3);
|
|
/* coupling band structure */
|
|
if (s->eac3) {
|
|
put_bits(&s->pb, 1, 0); /* use default */
|
|
} else {
|
|
for (bnd = start_sub+1; bnd < end_sub; bnd++)
|
|
put_bits(&s->pb, 1, ff_eac3_default_cpl_band_struct[bnd]);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* coupling coordinates */
|
|
if (block->cpl_in_use) {
|
|
for (ch = 1; ch <= s->fbw_channels; ch++) {
|
|
if (block->channel_in_cpl[ch]) {
|
|
if (!s->eac3 || block->new_cpl_coords != 2)
|
|
put_bits(&s->pb, 1, block->new_cpl_coords);
|
|
if (block->new_cpl_coords) {
|
|
put_bits(&s->pb, 2, block->cpl_master_exp[ch]);
|
|
for (bnd = 0; bnd < s->num_cpl_bands; bnd++) {
|
|
put_bits(&s->pb, 4, block->cpl_coord_exp [ch][bnd]);
|
|
put_bits(&s->pb, 4, block->cpl_coord_mant[ch][bnd]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* stereo rematrixing */
|
|
if (s->channel_mode == AC3_CHMODE_STEREO) {
|
|
if (!s->eac3 || blk > 0)
|
|
put_bits(&s->pb, 1, block->new_rematrixing_strategy);
|
|
if (block->new_rematrixing_strategy) {
|
|
/* rematrixing flags */
|
|
for (bnd = 0; bnd < block->num_rematrixing_bands; bnd++)
|
|
put_bits(&s->pb, 1, block->rematrixing_flags[bnd]);
|
|
}
|
|
}
|
|
|
|
/* exponent strategy */
|
|
if (!s->eac3) {
|
|
for (ch = !block->cpl_in_use; ch <= s->fbw_channels; ch++)
|
|
put_bits(&s->pb, 2, s->exp_strategy[ch][blk]);
|
|
if (s->lfe_on)
|
|
put_bits(&s->pb, 1, s->exp_strategy[s->lfe_channel][blk]);
|
|
}
|
|
|
|
/* bandwidth */
|
|
for (ch = 1; ch <= s->fbw_channels; ch++) {
|
|
if (s->exp_strategy[ch][blk] != EXP_REUSE && !block->channel_in_cpl[ch])
|
|
put_bits(&s->pb, 6, s->bandwidth_code);
|
|
}
|
|
|
|
/* exponents */
|
|
for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
|
|
int nb_groups;
|
|
int cpl = (ch == CPL_CH);
|
|
|
|
if (s->exp_strategy[ch][blk] == EXP_REUSE)
|
|
continue;
|
|
|
|
/* DC exponent */
|
|
put_bits(&s->pb, 4, block->grouped_exp[ch][0] >> cpl);
|
|
|
|
/* exponent groups */
|
|
nb_groups = exponent_group_tab[cpl][s->exp_strategy[ch][blk]-1][block->end_freq[ch]-s->start_freq[ch]];
|
|
for (i = 1; i <= nb_groups; i++)
|
|
put_bits(&s->pb, 7, block->grouped_exp[ch][i]);
|
|
|
|
/* gain range info */
|
|
if (ch != s->lfe_channel && !cpl)
|
|
put_bits(&s->pb, 2, 0);
|
|
}
|
|
|
|
/* bit allocation info */
|
|
if (!s->eac3) {
|
|
baie = (blk == 0);
|
|
put_bits(&s->pb, 1, baie);
|
|
if (baie) {
|
|
put_bits(&s->pb, 2, s->slow_decay_code);
|
|
put_bits(&s->pb, 2, s->fast_decay_code);
|
|
put_bits(&s->pb, 2, s->slow_gain_code);
|
|
put_bits(&s->pb, 2, s->db_per_bit_code);
|
|
put_bits(&s->pb, 3, s->floor_code);
|
|
}
|
|
}
|
|
|
|
/* snr offset */
|
|
if (!s->eac3) {
|
|
put_bits(&s->pb, 1, block->new_snr_offsets);
|
|
if (block->new_snr_offsets) {
|
|
put_bits(&s->pb, 6, s->coarse_snr_offset);
|
|
for (ch = !block->cpl_in_use; ch <= s->channels; ch++) {
|
|
put_bits(&s->pb, 4, s->fine_snr_offset[ch]);
|
|
put_bits(&s->pb, 3, s->fast_gain_code[ch]);
|
|
}
|
|
}
|
|
} else {
|
|
put_bits(&s->pb, 1, 0); /* no converter snr offset */
|
|
}
|
|
|
|
/* coupling leak */
|
|
if (block->cpl_in_use) {
|
|
if (!s->eac3 || block->new_cpl_leak != 2)
|
|
put_bits(&s->pb, 1, block->new_cpl_leak);
|
|
if (block->new_cpl_leak) {
|
|
put_bits(&s->pb, 3, s->bit_alloc.cpl_fast_leak);
|
|
put_bits(&s->pb, 3, s->bit_alloc.cpl_slow_leak);
|
|
}
|
|
}
|
|
|
|
if (!s->eac3) {
|
|
put_bits(&s->pb, 1, 0); /* no delta bit allocation */
|
|
put_bits(&s->pb, 1, 0); /* no data to skip */
|
|
}
|
|
|
|
/* mantissas */
|
|
got_cpl = !block->cpl_in_use;
|
|
for (ch = 1; ch <= s->channels; ch++) {
|
|
int b, q;
|
|
|
|
if (!got_cpl && ch > 1 && block->channel_in_cpl[ch-1]) {
|
|
ch0 = ch - 1;
|
|
ch = CPL_CH;
|
|
got_cpl = 1;
|
|
}
|
|
for (i = s->start_freq[ch]; i < block->end_freq[ch]; i++) {
|
|
q = block->qmant[ch][i];
|
|
b = s->ref_bap[ch][blk][i];
|
|
switch (b) {
|
|
case 0: break;
|
|
case 1: if (q != 128) put_bits(&s->pb, 5, q); break;
|
|
case 2: if (q != 128) put_bits(&s->pb, 7, q); break;
|
|
case 3: put_bits(&s->pb, 3, q); break;
|
|
case 4: if (q != 128) put_bits(&s->pb, 7, q); break;
|
|
case 14: put_bits(&s->pb, 14, q); break;
|
|
case 15: put_bits(&s->pb, 16, q); break;
|
|
default: put_bits(&s->pb, b-1, q); break;
|
|
}
|
|
}
|
|
if (ch == CPL_CH)
|
|
ch = ch0;
|
|
}
|
|
}
|
|
|
|
|
|
/** CRC-16 Polynomial */
|
|
#define CRC16_POLY ((1 << 0) | (1 << 2) | (1 << 15) | (1 << 16))
|
|
|
|
|
|
static unsigned int mul_poly(unsigned int a, unsigned int b, unsigned int poly)
|
|
{
|
|
unsigned int c;
|
|
|
|
c = 0;
|
|
while (a) {
|
|
if (a & 1)
|
|
c ^= b;
|
|
a = a >> 1;
|
|
b = b << 1;
|
|
if (b & (1 << 16))
|
|
b ^= poly;
|
|
}
|
|
return c;
|
|
}
|
|
|
|
|
|
static unsigned int pow_poly(unsigned int a, unsigned int n, unsigned int poly)
|
|
{
|
|
unsigned int r;
|
|
r = 1;
|
|
while (n) {
|
|
if (n & 1)
|
|
r = mul_poly(r, a, poly);
|
|
a = mul_poly(a, a, poly);
|
|
n >>= 1;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
|
|
/**
|
|
* Fill the end of the frame with 0's and compute the two CRCs.
|
|
*/
|
|
static void output_frame_end(AC3EncodeContext *s)
|
|
{
|
|
const AVCRC *crc_ctx = av_crc_get_table(AV_CRC_16_ANSI);
|
|
int frame_size_58, pad_bytes, crc1, crc2_partial, crc2, crc_inv;
|
|
uint8_t *frame;
|
|
|
|
frame_size_58 = ((s->frame_size >> 2) + (s->frame_size >> 4)) << 1;
|
|
|
|
/* pad the remainder of the frame with zeros */
|
|
av_assert2(s->frame_size * 8 - put_bits_count(&s->pb) >= 18);
|
|
flush_put_bits(&s->pb);
|
|
frame = s->pb.buf;
|
|
pad_bytes = s->frame_size - (put_bits_ptr(&s->pb) - frame) - 2;
|
|
av_assert2(pad_bytes >= 0);
|
|
if (pad_bytes > 0)
|
|
memset(put_bits_ptr(&s->pb), 0, pad_bytes);
|
|
|
|
if (s->eac3) {
|
|
/* compute crc2 */
|
|
crc2_partial = av_crc(crc_ctx, 0, frame + 2, s->frame_size - 5);
|
|
} else {
|
|
/* compute crc1 */
|
|
/* this is not so easy because it is at the beginning of the data... */
|
|
crc1 = av_bswap16(av_crc(crc_ctx, 0, frame + 4, frame_size_58 - 4));
|
|
crc_inv = s->crc_inv[s->frame_size > s->frame_size_min];
|
|
crc1 = mul_poly(crc_inv, crc1, CRC16_POLY);
|
|
AV_WB16(frame + 2, crc1);
|
|
|
|
/* compute crc2 */
|
|
crc2_partial = av_crc(crc_ctx, 0, frame + frame_size_58,
|
|
s->frame_size - frame_size_58 - 3);
|
|
}
|
|
crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1);
|
|
/* ensure crc2 does not match sync word by flipping crcrsv bit if needed */
|
|
if (crc2 == 0x770B) {
|
|
frame[s->frame_size - 3] ^= 0x1;
|
|
crc2 = av_crc(crc_ctx, crc2_partial, frame + s->frame_size - 3, 1);
|
|
}
|
|
crc2 = av_bswap16(crc2);
|
|
AV_WB16(frame + s->frame_size - 2, crc2);
|
|
}
|
|
|
|
|
|
/**
|
|
* Write the frame to the output bitstream.
|
|
*/
|
|
static void output_frame(AC3EncodeContext *s, unsigned char *frame)
|
|
{
|
|
int blk;
|
|
|
|
init_put_bits(&s->pb, frame, AC3_MAX_CODED_FRAME_SIZE);
|
|
|
|
s->output_frame_header(s);
|
|
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
|
|
output_audio_block(s, blk);
|
|
|
|
output_frame_end(s);
|
|
}
|
|
|
|
|
|
static void dprint_options(AVCodecContext *avctx)
|
|
{
|
|
#ifdef DEBUG
|
|
AC3EncodeContext *s = avctx->priv_data;
|
|
AC3EncOptions *opt = &s->options;
|
|
char strbuf[32];
|
|
|
|
switch (s->bitstream_id) {
|
|
case 6: av_strlcpy(strbuf, "AC-3 (alt syntax)", 32); break;
|
|
case 8: av_strlcpy(strbuf, "AC-3 (standard)", 32); break;
|
|
case 9: av_strlcpy(strbuf, "AC-3 (dnet half-rate)", 32); break;
|
|
case 10: av_strlcpy(strbuf, "AC-3 (dnet quater-rate)", 32); break;
|
|
case 16: av_strlcpy(strbuf, "E-AC-3 (enhanced)", 32); break;
|
|
default: snprintf(strbuf, 32, "ERROR");
|
|
}
|
|
av_dlog(avctx, "bitstream_id: %s (%d)\n", strbuf, s->bitstream_id);
|
|
av_dlog(avctx, "sample_fmt: %s\n", av_get_sample_fmt_name(avctx->sample_fmt));
|
|
av_get_channel_layout_string(strbuf, 32, s->channels, avctx->channel_layout);
|
|
av_dlog(avctx, "channel_layout: %s\n", strbuf);
|
|
av_dlog(avctx, "sample_rate: %d\n", s->sample_rate);
|
|
av_dlog(avctx, "bit_rate: %d\n", s->bit_rate);
|
|
if (s->cutoff)
|
|
av_dlog(avctx, "cutoff: %d\n", s->cutoff);
|
|
|
|
av_dlog(avctx, "per_frame_metadata: %s\n",
|
|
opt->allow_per_frame_metadata?"on":"off");
|
|
if (s->has_center)
|
|
av_dlog(avctx, "center_mixlev: %0.3f (%d)\n", opt->center_mix_level,
|
|
s->center_mix_level);
|
|
else
|
|
av_dlog(avctx, "center_mixlev: {not written}\n");
|
|
if (s->has_surround)
|
|
av_dlog(avctx, "surround_mixlev: %0.3f (%d)\n", opt->surround_mix_level,
|
|
s->surround_mix_level);
|
|
else
|
|
av_dlog(avctx, "surround_mixlev: {not written}\n");
|
|
if (opt->audio_production_info) {
|
|
av_dlog(avctx, "mixing_level: %ddB\n", opt->mixing_level);
|
|
switch (opt->room_type) {
|
|
case 0: av_strlcpy(strbuf, "notindicated", 32); break;
|
|
case 1: av_strlcpy(strbuf, "large", 32); break;
|
|
case 2: av_strlcpy(strbuf, "small", 32); break;
|
|
default: snprintf(strbuf, 32, "ERROR (%d)", opt->room_type);
|
|
}
|
|
av_dlog(avctx, "room_type: %s\n", strbuf);
|
|
} else {
|
|
av_dlog(avctx, "mixing_level: {not written}\n");
|
|
av_dlog(avctx, "room_type: {not written}\n");
|
|
}
|
|
av_dlog(avctx, "copyright: %s\n", opt->copyright?"on":"off");
|
|
av_dlog(avctx, "dialnorm: %ddB\n", opt->dialogue_level);
|
|
if (s->channel_mode == AC3_CHMODE_STEREO) {
|
|
switch (opt->dolby_surround_mode) {
|
|
case 0: av_strlcpy(strbuf, "notindicated", 32); break;
|
|
case 1: av_strlcpy(strbuf, "on", 32); break;
|
|
case 2: av_strlcpy(strbuf, "off", 32); break;
|
|
default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_mode);
|
|
}
|
|
av_dlog(avctx, "dsur_mode: %s\n", strbuf);
|
|
} else {
|
|
av_dlog(avctx, "dsur_mode: {not written}\n");
|
|
}
|
|
av_dlog(avctx, "original: %s\n", opt->original?"on":"off");
|
|
|
|
if (s->bitstream_id == 6) {
|
|
if (opt->extended_bsi_1) {
|
|
switch (opt->preferred_stereo_downmix) {
|
|
case 0: av_strlcpy(strbuf, "notindicated", 32); break;
|
|
case 1: av_strlcpy(strbuf, "ltrt", 32); break;
|
|
case 2: av_strlcpy(strbuf, "loro", 32); break;
|
|
default: snprintf(strbuf, 32, "ERROR (%d)", opt->preferred_stereo_downmix);
|
|
}
|
|
av_dlog(avctx, "dmix_mode: %s\n", strbuf);
|
|
av_dlog(avctx, "ltrt_cmixlev: %0.3f (%d)\n",
|
|
opt->ltrt_center_mix_level, s->ltrt_center_mix_level);
|
|
av_dlog(avctx, "ltrt_surmixlev: %0.3f (%d)\n",
|
|
opt->ltrt_surround_mix_level, s->ltrt_surround_mix_level);
|
|
av_dlog(avctx, "loro_cmixlev: %0.3f (%d)\n",
|
|
opt->loro_center_mix_level, s->loro_center_mix_level);
|
|
av_dlog(avctx, "loro_surmixlev: %0.3f (%d)\n",
|
|
opt->loro_surround_mix_level, s->loro_surround_mix_level);
|
|
} else {
|
|
av_dlog(avctx, "extended bitstream info 1: {not written}\n");
|
|
}
|
|
if (opt->extended_bsi_2) {
|
|
switch (opt->dolby_surround_ex_mode) {
|
|
case 0: av_strlcpy(strbuf, "notindicated", 32); break;
|
|
case 1: av_strlcpy(strbuf, "on", 32); break;
|
|
case 2: av_strlcpy(strbuf, "off", 32); break;
|
|
default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_surround_ex_mode);
|
|
}
|
|
av_dlog(avctx, "dsurex_mode: %s\n", strbuf);
|
|
switch (opt->dolby_headphone_mode) {
|
|
case 0: av_strlcpy(strbuf, "notindicated", 32); break;
|
|
case 1: av_strlcpy(strbuf, "on", 32); break;
|
|
case 2: av_strlcpy(strbuf, "off", 32); break;
|
|
default: snprintf(strbuf, 32, "ERROR (%d)", opt->dolby_headphone_mode);
|
|
}
|
|
av_dlog(avctx, "dheadphone_mode: %s\n", strbuf);
|
|
|
|
switch (opt->ad_converter_type) {
|
|
case 0: av_strlcpy(strbuf, "standard", 32); break;
|
|
case 1: av_strlcpy(strbuf, "hdcd", 32); break;
|
|
default: snprintf(strbuf, 32, "ERROR (%d)", opt->ad_converter_type);
|
|
}
|
|
av_dlog(avctx, "ad_conv_type: %s\n", strbuf);
|
|
} else {
|
|
av_dlog(avctx, "extended bitstream info 2: {not written}\n");
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
#define FLT_OPTION_THRESHOLD 0.01
|
|
|
|
static int validate_float_option(float v, const float *v_list, int v_list_size)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < v_list_size; i++) {
|
|
if (v < (v_list[i] + FLT_OPTION_THRESHOLD) &&
|
|
v > (v_list[i] - FLT_OPTION_THRESHOLD))
|
|
break;
|
|
}
|
|
if (i == v_list_size)
|
|
return -1;
|
|
|
|
return i;
|
|
}
|
|
|
|
|
|
static void validate_mix_level(void *log_ctx, const char *opt_name,
|
|
float *opt_param, const float *list,
|
|
int list_size, int default_value, int min_value,
|
|
int *ctx_param)
|
|
{
|
|
int mixlev = validate_float_option(*opt_param, list, list_size);
|
|
if (mixlev < min_value) {
|
|
mixlev = default_value;
|
|
if (*opt_param >= 0.0) {
|
|
av_log(log_ctx, AV_LOG_WARNING, "requested %s is not valid. using "
|
|
"default value: %0.3f\n", opt_name, list[mixlev]);
|
|
}
|
|
}
|
|
*opt_param = list[mixlev];
|
|
*ctx_param = mixlev;
|
|
}
|
|
|
|
|
|
/**
|
|
* Validate metadata options as set by AVOption system.
|
|
* These values can optionally be changed per-frame.
|
|
*/
|
|
static int validate_metadata(AVCodecContext *avctx)
|
|
{
|
|
AC3EncodeContext *s = avctx->priv_data;
|
|
AC3EncOptions *opt = &s->options;
|
|
|
|
/* validate mixing levels */
|
|
if (s->has_center) {
|
|
validate_mix_level(avctx, "center_mix_level", &opt->center_mix_level,
|
|
cmixlev_options, CMIXLEV_NUM_OPTIONS, 1, 0,
|
|
&s->center_mix_level);
|
|
}
|
|
if (s->has_surround) {
|
|
validate_mix_level(avctx, "surround_mix_level", &opt->surround_mix_level,
|
|
surmixlev_options, SURMIXLEV_NUM_OPTIONS, 1, 0,
|
|
&s->surround_mix_level);
|
|
}
|
|
|
|
/* set audio production info flag */
|
|
if (opt->mixing_level >= 0 || opt->room_type >= 0) {
|
|
if (opt->mixing_level < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "mixing_level must be set if "
|
|
"room_type is set\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
if (opt->mixing_level < 80) {
|
|
av_log(avctx, AV_LOG_ERROR, "invalid mixing level. must be between "
|
|
"80dB and 111dB\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
/* default room type */
|
|
if (opt->room_type < 0)
|
|
opt->room_type = 0;
|
|
opt->audio_production_info = 1;
|
|
} else {
|
|
opt->audio_production_info = 0;
|
|
}
|
|
|
|
/* set extended bsi 1 flag */
|
|
if ((s->has_center || s->has_surround) &&
|
|
(opt->preferred_stereo_downmix >= 0 ||
|
|
opt->ltrt_center_mix_level >= 0 ||
|
|
opt->ltrt_surround_mix_level >= 0 ||
|
|
opt->loro_center_mix_level >= 0 ||
|
|
opt->loro_surround_mix_level >= 0)) {
|
|
/* default preferred stereo downmix */
|
|
if (opt->preferred_stereo_downmix < 0)
|
|
opt->preferred_stereo_downmix = 0;
|
|
/* validate Lt/Rt center mix level */
|
|
validate_mix_level(avctx, "ltrt_center_mix_level",
|
|
&opt->ltrt_center_mix_level, extmixlev_options,
|
|
EXTMIXLEV_NUM_OPTIONS, 5, 0,
|
|
&s->ltrt_center_mix_level);
|
|
/* validate Lt/Rt surround mix level */
|
|
validate_mix_level(avctx, "ltrt_surround_mix_level",
|
|
&opt->ltrt_surround_mix_level, extmixlev_options,
|
|
EXTMIXLEV_NUM_OPTIONS, 6, 3,
|
|
&s->ltrt_surround_mix_level);
|
|
/* validate Lo/Ro center mix level */
|
|
validate_mix_level(avctx, "loro_center_mix_level",
|
|
&opt->loro_center_mix_level, extmixlev_options,
|
|
EXTMIXLEV_NUM_OPTIONS, 5, 0,
|
|
&s->loro_center_mix_level);
|
|
/* validate Lo/Ro surround mix level */
|
|
validate_mix_level(avctx, "loro_surround_mix_level",
|
|
&opt->loro_surround_mix_level, extmixlev_options,
|
|
EXTMIXLEV_NUM_OPTIONS, 6, 3,
|
|
&s->loro_surround_mix_level);
|
|
opt->extended_bsi_1 = 1;
|
|
} else {
|
|
opt->extended_bsi_1 = 0;
|
|
}
|
|
|
|
/* set extended bsi 2 flag */
|
|
if (opt->dolby_surround_ex_mode >= 0 ||
|
|
opt->dolby_headphone_mode >= 0 ||
|
|
opt->ad_converter_type >= 0) {
|
|
/* default dolby surround ex mode */
|
|
if (opt->dolby_surround_ex_mode < 0)
|
|
opt->dolby_surround_ex_mode = 0;
|
|
/* default dolby headphone mode */
|
|
if (opt->dolby_headphone_mode < 0)
|
|
opt->dolby_headphone_mode = 0;
|
|
/* default A/D converter type */
|
|
if (opt->ad_converter_type < 0)
|
|
opt->ad_converter_type = 0;
|
|
opt->extended_bsi_2 = 1;
|
|
} else {
|
|
opt->extended_bsi_2 = 0;
|
|
}
|
|
|
|
/* set bitstream id for alternate bitstream syntax */
|
|
if (opt->extended_bsi_1 || opt->extended_bsi_2) {
|
|
if (s->bitstream_id > 8 && s->bitstream_id < 11) {
|
|
static int warn_once = 1;
|
|
if (warn_once) {
|
|
av_log(avctx, AV_LOG_WARNING, "alternate bitstream syntax is "
|
|
"not compatible with reduced samplerates. writing of "
|
|
"extended bitstream information will be disabled.\n");
|
|
warn_once = 0;
|
|
}
|
|
} else {
|
|
s->bitstream_id = 6;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* Encode a single AC-3 frame.
|
|
*/
|
|
int ff_ac3_encode_frame(AVCodecContext *avctx, unsigned char *frame,
|
|
int buf_size, void *data)
|
|
{
|
|
AC3EncodeContext *s = avctx->priv_data;
|
|
const SampleType *samples = data;
|
|
int ret;
|
|
|
|
if (!s->eac3 && s->options.allow_per_frame_metadata) {
|
|
ret = validate_metadata(avctx);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (s->bit_alloc.sr_code == 1 || s->eac3)
|
|
adjust_frame_size(s);
|
|
|
|
s->deinterleave_input_samples(s, samples);
|
|
|
|
s->apply_mdct(s);
|
|
|
|
s->scale_coefficients(s);
|
|
|
|
s->cpl_on = s->cpl_enabled;
|
|
compute_coupling_strategy(s);
|
|
|
|
if (s->cpl_on)
|
|
s->apply_channel_coupling(s);
|
|
|
|
s->compute_rematrixing_strategy(s);
|
|
|
|
apply_rematrixing(s);
|
|
|
|
process_exponents(s);
|
|
|
|
ret = compute_bit_allocation(s);
|
|
if (ret) {
|
|
av_log(avctx, AV_LOG_ERROR, "Bit allocation failed. Try increasing the bitrate.\n");
|
|
return ret;
|
|
}
|
|
|
|
quantize_mantissas(s);
|
|
|
|
output_frame(s, frame);
|
|
|
|
return s->frame_size;
|
|
}
|
|
|
|
|
|
/**
|
|
* Finalize encoding and free any memory allocated by the encoder.
|
|
*/
|
|
av_cold int ff_ac3_encode_close(AVCodecContext *avctx)
|
|
{
|
|
int blk, ch;
|
|
AC3EncodeContext *s = avctx->priv_data;
|
|
|
|
av_freep(&s->windowed_samples);
|
|
for (ch = 0; ch < s->channels; ch++)
|
|
av_freep(&s->planar_samples[ch]);
|
|
av_freep(&s->planar_samples);
|
|
av_freep(&s->bap_buffer);
|
|
av_freep(&s->bap1_buffer);
|
|
av_freep(&s->mdct_coef_buffer);
|
|
av_freep(&s->fixed_coef_buffer);
|
|
av_freep(&s->exp_buffer);
|
|
av_freep(&s->grouped_exp_buffer);
|
|
av_freep(&s->psd_buffer);
|
|
av_freep(&s->band_psd_buffer);
|
|
av_freep(&s->mask_buffer);
|
|
av_freep(&s->qmant_buffer);
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
|
|
AC3Block *block = &s->blocks[blk];
|
|
av_freep(&block->mdct_coef);
|
|
av_freep(&block->fixed_coef);
|
|
av_freep(&block->exp);
|
|
av_freep(&block->grouped_exp);
|
|
av_freep(&block->psd);
|
|
av_freep(&block->band_psd);
|
|
av_freep(&block->mask);
|
|
av_freep(&block->qmant);
|
|
}
|
|
|
|
s->mdct_end(s->mdct);
|
|
av_freep(&s->mdct);
|
|
|
|
av_freep(&avctx->coded_frame);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* Set channel information during initialization.
|
|
*/
|
|
static av_cold int set_channel_info(AC3EncodeContext *s, int channels,
|
|
int64_t *channel_layout)
|
|
{
|
|
int ch_layout;
|
|
|
|
if (channels < 1 || channels > AC3_MAX_CHANNELS)
|
|
return AVERROR(EINVAL);
|
|
if ((uint64_t)*channel_layout > 0x7FF)
|
|
return AVERROR(EINVAL);
|
|
ch_layout = *channel_layout;
|
|
if (!ch_layout)
|
|
ch_layout = avcodec_guess_channel_layout(channels, CODEC_ID_AC3, NULL);
|
|
|
|
s->lfe_on = !!(ch_layout & AV_CH_LOW_FREQUENCY);
|
|
s->channels = channels;
|
|
s->fbw_channels = channels - s->lfe_on;
|
|
s->lfe_channel = s->lfe_on ? s->fbw_channels + 1 : -1;
|
|
if (s->lfe_on)
|
|
ch_layout -= AV_CH_LOW_FREQUENCY;
|
|
|
|
switch (ch_layout) {
|
|
case AV_CH_LAYOUT_MONO: s->channel_mode = AC3_CHMODE_MONO; break;
|
|
case AV_CH_LAYOUT_STEREO: s->channel_mode = AC3_CHMODE_STEREO; break;
|
|
case AV_CH_LAYOUT_SURROUND: s->channel_mode = AC3_CHMODE_3F; break;
|
|
case AV_CH_LAYOUT_2_1: s->channel_mode = AC3_CHMODE_2F1R; break;
|
|
case AV_CH_LAYOUT_4POINT0: s->channel_mode = AC3_CHMODE_3F1R; break;
|
|
case AV_CH_LAYOUT_QUAD:
|
|
case AV_CH_LAYOUT_2_2: s->channel_mode = AC3_CHMODE_2F2R; break;
|
|
case AV_CH_LAYOUT_5POINT0:
|
|
case AV_CH_LAYOUT_5POINT0_BACK: s->channel_mode = AC3_CHMODE_3F2R; break;
|
|
default:
|
|
return AVERROR(EINVAL);
|
|
}
|
|
s->has_center = (s->channel_mode & 0x01) && s->channel_mode != AC3_CHMODE_MONO;
|
|
s->has_surround = s->channel_mode & 0x04;
|
|
|
|
s->channel_map = ff_ac3_enc_channel_map[s->channel_mode][s->lfe_on];
|
|
*channel_layout = ch_layout;
|
|
if (s->lfe_on)
|
|
*channel_layout |= AV_CH_LOW_FREQUENCY;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static av_cold int validate_options(AVCodecContext *avctx, AC3EncodeContext *s)
|
|
{
|
|
int i, ret, max_sr;
|
|
|
|
/* validate channel layout */
|
|
if (!avctx->channel_layout) {
|
|
av_log(avctx, AV_LOG_WARNING, "No channel layout specified. The "
|
|
"encoder will guess the layout, but it "
|
|
"might be incorrect.\n");
|
|
}
|
|
ret = set_channel_info(s, avctx->channels, &avctx->channel_layout);
|
|
if (ret) {
|
|
av_log(avctx, AV_LOG_ERROR, "invalid channel layout\n");
|
|
return ret;
|
|
}
|
|
|
|
/* validate sample rate */
|
|
/* note: max_sr could be changed from 2 to 5 for E-AC-3 once we find a
|
|
decoder that supports half sample rate so we can validate that
|
|
the generated files are correct. */
|
|
max_sr = s->eac3 ? 2 : 8;
|
|
for (i = 0; i <= max_sr; i++) {
|
|
if ((ff_ac3_sample_rate_tab[i % 3] >> (i / 3)) == avctx->sample_rate)
|
|
break;
|
|
}
|
|
if (i > max_sr) {
|
|
av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
s->sample_rate = avctx->sample_rate;
|
|
s->bit_alloc.sr_shift = i / 3;
|
|
s->bit_alloc.sr_code = i % 3;
|
|
s->bitstream_id = s->eac3 ? 16 : 8 + s->bit_alloc.sr_shift;
|
|
|
|
/* validate bit rate */
|
|
if (s->eac3) {
|
|
int max_br, min_br, wpf, min_br_dist, min_br_code;
|
|
|
|
/* calculate min/max bitrate */
|
|
max_br = 2048 * s->sample_rate / AC3_FRAME_SIZE * 16;
|
|
min_br = ((s->sample_rate + (AC3_FRAME_SIZE-1)) / AC3_FRAME_SIZE) * 16;
|
|
if (avctx->bit_rate < min_br || avctx->bit_rate > max_br) {
|
|
av_log(avctx, AV_LOG_ERROR, "invalid bit rate. must be %d to %d "
|
|
"for this sample rate\n", min_br, max_br);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
/* calculate words-per-frame for the selected bitrate */
|
|
wpf = (avctx->bit_rate / 16) * AC3_FRAME_SIZE / s->sample_rate;
|
|
av_assert1(wpf > 0 && wpf <= 2048);
|
|
|
|
/* find the closest AC-3 bitrate code to the selected bitrate.
|
|
this is needed for lookup tables for bandwidth and coupling
|
|
parameter selection */
|
|
min_br_code = -1;
|
|
min_br_dist = INT_MAX;
|
|
for (i = 0; i < 19; i++) {
|
|
int br_dist = abs(ff_ac3_bitrate_tab[i] * 1000 - avctx->bit_rate);
|
|
if (br_dist < min_br_dist) {
|
|
min_br_dist = br_dist;
|
|
min_br_code = i;
|
|
}
|
|
}
|
|
|
|
/* make sure the minimum frame size is below the average frame size */
|
|
s->frame_size_code = min_br_code << 1;
|
|
while (wpf > 1 && wpf * s->sample_rate / AC3_FRAME_SIZE * 16 > avctx->bit_rate)
|
|
wpf--;
|
|
s->frame_size_min = 2 * wpf;
|
|
} else {
|
|
for (i = 0; i < 19; i++) {
|
|
if ((ff_ac3_bitrate_tab[i] >> s->bit_alloc.sr_shift)*1000 == avctx->bit_rate)
|
|
break;
|
|
}
|
|
if (i == 19) {
|
|
av_log(avctx, AV_LOG_ERROR, "invalid bit rate\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
s->frame_size_code = i << 1;
|
|
s->frame_size_min = 2 * ff_ac3_frame_size_tab[s->frame_size_code][s->bit_alloc.sr_code];
|
|
}
|
|
s->bit_rate = avctx->bit_rate;
|
|
s->frame_size = s->frame_size_min;
|
|
|
|
/* validate cutoff */
|
|
if (avctx->cutoff < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "invalid cutoff frequency\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
s->cutoff = avctx->cutoff;
|
|
if (s->cutoff > (s->sample_rate >> 1))
|
|
s->cutoff = s->sample_rate >> 1;
|
|
|
|
/* validate audio service type / channels combination */
|
|
if ((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_KARAOKE &&
|
|
avctx->channels == 1) ||
|
|
((avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_COMMENTARY ||
|
|
avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_EMERGENCY ||
|
|
avctx->audio_service_type == AV_AUDIO_SERVICE_TYPE_VOICE_OVER)
|
|
&& avctx->channels > 1)) {
|
|
av_log(avctx, AV_LOG_ERROR, "invalid audio service type for the "
|
|
"specified number of channels\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if (!s->eac3) {
|
|
ret = validate_metadata(avctx);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
s->rematrixing_enabled = s->options.stereo_rematrixing &&
|
|
(s->channel_mode == AC3_CHMODE_STEREO);
|
|
|
|
s->cpl_enabled = s->options.channel_coupling &&
|
|
s->channel_mode >= AC3_CHMODE_STEREO && !s->fixed_point;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* Set bandwidth for all channels.
|
|
* The user can optionally supply a cutoff frequency. Otherwise an appropriate
|
|
* default value will be used.
|
|
*/
|
|
static av_cold void set_bandwidth(AC3EncodeContext *s)
|
|
{
|
|
int blk, ch;
|
|
int av_uninit(cpl_start);
|
|
|
|
if (s->cutoff) {
|
|
/* calculate bandwidth based on user-specified cutoff frequency */
|
|
int fbw_coeffs;
|
|
fbw_coeffs = s->cutoff * 2 * AC3_MAX_COEFS / s->sample_rate;
|
|
s->bandwidth_code = av_clip((fbw_coeffs - 73) / 3, 0, 60);
|
|
} else {
|
|
/* use default bandwidth setting */
|
|
s->bandwidth_code = ac3_bandwidth_tab[s->fbw_channels-1][s->bit_alloc.sr_code][s->frame_size_code/2];
|
|
}
|
|
|
|
/* set number of coefficients for each channel */
|
|
for (ch = 1; ch <= s->fbw_channels; ch++) {
|
|
s->start_freq[ch] = 0;
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
|
|
s->blocks[blk].end_freq[ch] = s->bandwidth_code * 3 + 73;
|
|
}
|
|
/* LFE channel always has 7 coefs */
|
|
if (s->lfe_on) {
|
|
s->start_freq[s->lfe_channel] = 0;
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
|
|
s->blocks[blk].end_freq[ch] = 7;
|
|
}
|
|
|
|
/* initialize coupling strategy */
|
|
if (s->cpl_enabled) {
|
|
if (s->options.cpl_start >= 0) {
|
|
cpl_start = s->options.cpl_start;
|
|
} else {
|
|
cpl_start = ac3_coupling_start_tab[s->channel_mode-2][s->bit_alloc.sr_code][s->frame_size_code/2];
|
|
if (cpl_start < 0)
|
|
s->cpl_enabled = 0;
|
|
}
|
|
}
|
|
if (s->cpl_enabled) {
|
|
int i, cpl_start_band, cpl_end_band;
|
|
uint8_t *cpl_band_sizes = s->cpl_band_sizes;
|
|
|
|
cpl_end_band = s->bandwidth_code / 4 + 3;
|
|
cpl_start_band = av_clip(cpl_start, 0, FFMIN(cpl_end_band-1, 15));
|
|
|
|
s->num_cpl_subbands = cpl_end_band - cpl_start_band;
|
|
|
|
s->num_cpl_bands = 1;
|
|
*cpl_band_sizes = 12;
|
|
for (i = cpl_start_band + 1; i < cpl_end_band; i++) {
|
|
if (ff_eac3_default_cpl_band_struct[i]) {
|
|
*cpl_band_sizes += 12;
|
|
} else {
|
|
s->num_cpl_bands++;
|
|
cpl_band_sizes++;
|
|
*cpl_band_sizes = 12;
|
|
}
|
|
}
|
|
|
|
s->start_freq[CPL_CH] = cpl_start_band * 12 + 37;
|
|
s->cpl_end_freq = cpl_end_band * 12 + 37;
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++)
|
|
s->blocks[blk].end_freq[CPL_CH] = s->cpl_end_freq;
|
|
}
|
|
}
|
|
|
|
|
|
static av_cold int allocate_buffers(AVCodecContext *avctx)
|
|
{
|
|
int blk, ch;
|
|
AC3EncodeContext *s = avctx->priv_data;
|
|
int channels = s->channels + 1; /* includes coupling channel */
|
|
|
|
if (s->allocate_sample_buffers(s))
|
|
goto alloc_fail;
|
|
|
|
FF_ALLOC_OR_GOTO(avctx, s->bap_buffer, AC3_MAX_BLOCKS * channels *
|
|
AC3_MAX_COEFS * sizeof(*s->bap_buffer), alloc_fail);
|
|
FF_ALLOC_OR_GOTO(avctx, s->bap1_buffer, AC3_MAX_BLOCKS * channels *
|
|
AC3_MAX_COEFS * sizeof(*s->bap1_buffer), alloc_fail);
|
|
FF_ALLOCZ_OR_GOTO(avctx, s->mdct_coef_buffer, AC3_MAX_BLOCKS * channels *
|
|
AC3_MAX_COEFS * sizeof(*s->mdct_coef_buffer), alloc_fail);
|
|
FF_ALLOC_OR_GOTO(avctx, s->exp_buffer, AC3_MAX_BLOCKS * channels *
|
|
AC3_MAX_COEFS * sizeof(*s->exp_buffer), alloc_fail);
|
|
FF_ALLOC_OR_GOTO(avctx, s->grouped_exp_buffer, AC3_MAX_BLOCKS * channels *
|
|
128 * sizeof(*s->grouped_exp_buffer), alloc_fail);
|
|
FF_ALLOC_OR_GOTO(avctx, s->psd_buffer, AC3_MAX_BLOCKS * channels *
|
|
AC3_MAX_COEFS * sizeof(*s->psd_buffer), alloc_fail);
|
|
FF_ALLOC_OR_GOTO(avctx, s->band_psd_buffer, AC3_MAX_BLOCKS * channels *
|
|
64 * sizeof(*s->band_psd_buffer), alloc_fail);
|
|
FF_ALLOC_OR_GOTO(avctx, s->mask_buffer, AC3_MAX_BLOCKS * channels *
|
|
64 * sizeof(*s->mask_buffer), alloc_fail);
|
|
FF_ALLOC_OR_GOTO(avctx, s->qmant_buffer, AC3_MAX_BLOCKS * channels *
|
|
AC3_MAX_COEFS * sizeof(*s->qmant_buffer), alloc_fail);
|
|
if (s->cpl_enabled) {
|
|
FF_ALLOC_OR_GOTO(avctx, s->cpl_coord_exp_buffer, AC3_MAX_BLOCKS * channels *
|
|
16 * sizeof(*s->cpl_coord_exp_buffer), alloc_fail);
|
|
FF_ALLOC_OR_GOTO(avctx, s->cpl_coord_mant_buffer, AC3_MAX_BLOCKS * channels *
|
|
16 * sizeof(*s->cpl_coord_mant_buffer), alloc_fail);
|
|
}
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
|
|
AC3Block *block = &s->blocks[blk];
|
|
FF_ALLOCZ_OR_GOTO(avctx, block->mdct_coef, channels * sizeof(*block->mdct_coef),
|
|
alloc_fail);
|
|
FF_ALLOCZ_OR_GOTO(avctx, block->exp, channels * sizeof(*block->exp),
|
|
alloc_fail);
|
|
FF_ALLOCZ_OR_GOTO(avctx, block->grouped_exp, channels * sizeof(*block->grouped_exp),
|
|
alloc_fail);
|
|
FF_ALLOCZ_OR_GOTO(avctx, block->psd, channels * sizeof(*block->psd),
|
|
alloc_fail);
|
|
FF_ALLOCZ_OR_GOTO(avctx, block->band_psd, channels * sizeof(*block->band_psd),
|
|
alloc_fail);
|
|
FF_ALLOCZ_OR_GOTO(avctx, block->mask, channels * sizeof(*block->mask),
|
|
alloc_fail);
|
|
FF_ALLOCZ_OR_GOTO(avctx, block->qmant, channels * sizeof(*block->qmant),
|
|
alloc_fail);
|
|
if (s->cpl_enabled) {
|
|
FF_ALLOCZ_OR_GOTO(avctx, block->cpl_coord_exp, channels * sizeof(*block->cpl_coord_exp),
|
|
alloc_fail);
|
|
FF_ALLOCZ_OR_GOTO(avctx, block->cpl_coord_mant, channels * sizeof(*block->cpl_coord_mant),
|
|
alloc_fail);
|
|
}
|
|
|
|
for (ch = 0; ch < channels; ch++) {
|
|
/* arrangement: block, channel, coeff */
|
|
block->grouped_exp[ch] = &s->grouped_exp_buffer[128 * (blk * channels + ch)];
|
|
block->psd[ch] = &s->psd_buffer [AC3_MAX_COEFS * (blk * channels + ch)];
|
|
block->band_psd[ch] = &s->band_psd_buffer [64 * (blk * channels + ch)];
|
|
block->mask[ch] = &s->mask_buffer [64 * (blk * channels + ch)];
|
|
block->qmant[ch] = &s->qmant_buffer [AC3_MAX_COEFS * (blk * channels + ch)];
|
|
if (s->cpl_enabled) {
|
|
block->cpl_coord_exp[ch] = &s->cpl_coord_exp_buffer [16 * (blk * channels + ch)];
|
|
block->cpl_coord_mant[ch] = &s->cpl_coord_mant_buffer[16 * (blk * channels + ch)];
|
|
}
|
|
|
|
/* arrangement: channel, block, coeff */
|
|
block->exp[ch] = &s->exp_buffer [AC3_MAX_COEFS * (AC3_MAX_BLOCKS * ch + blk)];
|
|
block->mdct_coef[ch] = &s->mdct_coef_buffer [AC3_MAX_COEFS * (AC3_MAX_BLOCKS * ch + blk)];
|
|
}
|
|
}
|
|
|
|
if (!s->fixed_point) {
|
|
FF_ALLOCZ_OR_GOTO(avctx, s->fixed_coef_buffer, AC3_MAX_BLOCKS * channels *
|
|
AC3_MAX_COEFS * sizeof(*s->fixed_coef_buffer), alloc_fail);
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
|
|
AC3Block *block = &s->blocks[blk];
|
|
FF_ALLOCZ_OR_GOTO(avctx, block->fixed_coef, channels *
|
|
sizeof(*block->fixed_coef), alloc_fail);
|
|
for (ch = 0; ch < channels; ch++)
|
|
block->fixed_coef[ch] = &s->fixed_coef_buffer[AC3_MAX_COEFS * (AC3_MAX_BLOCKS * ch + blk)];
|
|
}
|
|
} else {
|
|
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
|
|
AC3Block *block = &s->blocks[blk];
|
|
FF_ALLOCZ_OR_GOTO(avctx, block->fixed_coef, channels *
|
|
sizeof(*block->fixed_coef), alloc_fail);
|
|
for (ch = 0; ch < channels; ch++)
|
|
block->fixed_coef[ch] = (int32_t *)block->mdct_coef[ch];
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
alloc_fail:
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
|
|
/**
|
|
* Initialize the encoder.
|
|
*/
|
|
av_cold int ff_ac3_encode_init(AVCodecContext *avctx)
|
|
{
|
|
AC3EncodeContext *s = avctx->priv_data;
|
|
int ret, frame_size_58;
|
|
|
|
s->avctx = avctx;
|
|
|
|
s->eac3 = avctx->codec_id == CODEC_ID_EAC3;
|
|
|
|
avctx->frame_size = AC3_FRAME_SIZE;
|
|
|
|
ff_ac3_common_init();
|
|
|
|
ret = validate_options(avctx, s);
|
|
if (ret)
|
|
return ret;
|
|
|
|
s->bitstream_mode = avctx->audio_service_type;
|
|
if (s->bitstream_mode == AV_AUDIO_SERVICE_TYPE_KARAOKE)
|
|
s->bitstream_mode = 0x7;
|
|
|
|
s->bits_written = 0;
|
|
s->samples_written = 0;
|
|
|
|
/* calculate crc_inv for both possible frame sizes */
|
|
frame_size_58 = (( s->frame_size >> 2) + ( s->frame_size >> 4)) << 1;
|
|
s->crc_inv[0] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
|
|
if (s->bit_alloc.sr_code == 1) {
|
|
frame_size_58 = (((s->frame_size+2) >> 2) + ((s->frame_size+2) >> 4)) << 1;
|
|
s->crc_inv[1] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
|
|
}
|
|
|
|
/* set function pointers */
|
|
if (CONFIG_AC3_FIXED_ENCODER && s->fixed_point) {
|
|
s->mdct_end = ff_ac3_fixed_mdct_end;
|
|
s->mdct_init = ff_ac3_fixed_mdct_init;
|
|
s->apply_window = ff_ac3_fixed_apply_window;
|
|
s->normalize_samples = ff_ac3_fixed_normalize_samples;
|
|
s->scale_coefficients = ff_ac3_fixed_scale_coefficients;
|
|
s->allocate_sample_buffers = ff_ac3_fixed_allocate_sample_buffers;
|
|
s->deinterleave_input_samples = ff_ac3_fixed_deinterleave_input_samples;
|
|
s->apply_mdct = ff_ac3_fixed_apply_mdct;
|
|
s->apply_channel_coupling = ff_ac3_fixed_apply_channel_coupling;
|
|
s->compute_rematrixing_strategy = ff_ac3_fixed_compute_rematrixing_strategy;
|
|
} else if (CONFIG_AC3_ENCODER || CONFIG_EAC3_ENCODER) {
|
|
s->mdct_end = ff_ac3_float_mdct_end;
|
|
s->mdct_init = ff_ac3_float_mdct_init;
|
|
s->apply_window = ff_ac3_float_apply_window;
|
|
s->scale_coefficients = ff_ac3_float_scale_coefficients;
|
|
s->allocate_sample_buffers = ff_ac3_float_allocate_sample_buffers;
|
|
s->deinterleave_input_samples = ff_ac3_float_deinterleave_input_samples;
|
|
s->apply_mdct = ff_ac3_float_apply_mdct;
|
|
s->apply_channel_coupling = ff_ac3_float_apply_channel_coupling;
|
|
s->compute_rematrixing_strategy = ff_ac3_float_compute_rematrixing_strategy;
|
|
}
|
|
if (CONFIG_EAC3_ENCODER && s->eac3)
|
|
s->output_frame_header = ff_eac3_output_frame_header;
|
|
else
|
|
s->output_frame_header = ac3_output_frame_header;
|
|
|
|
set_bandwidth(s);
|
|
|
|
exponent_init(s);
|
|
|
|
bit_alloc_init(s);
|
|
|
|
FF_ALLOCZ_OR_GOTO(avctx, s->mdct, sizeof(AC3MDCTContext), init_fail);
|
|
ret = s->mdct_init(avctx, s->mdct, 9);
|
|
if (ret)
|
|
goto init_fail;
|
|
|
|
ret = allocate_buffers(avctx);
|
|
if (ret)
|
|
goto init_fail;
|
|
|
|
avctx->coded_frame= avcodec_alloc_frame();
|
|
|
|
dsputil_init(&s->dsp, avctx);
|
|
ff_ac3dsp_init(&s->ac3dsp, avctx->flags & CODEC_FLAG_BITEXACT);
|
|
|
|
dprint_options(avctx);
|
|
|
|
return 0;
|
|
init_fail:
|
|
ff_ac3_encode_close(avctx);
|
|
return ret;
|
|
}
|