1352 lines
42 KiB
C
1352 lines
42 KiB
C
/*
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* WMA compatible decoder
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* Copyright (c) 2002 The FFmpeg Project.
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avcodec.h"
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#include "dsputil.h"
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//#define DEBUG_PARAMS
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//#define DEBUG_TRACE
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/* size of blocks */
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#define BLOCK_MIN_BITS 7
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#define BLOCK_MAX_BITS 11
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#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
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#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
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/* XXX: find exact max size */
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#define HIGH_BAND_MAX_SIZE 16
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#define NB_LSP_COEFS 10
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/* XXX: is it a suitable value ? */
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#define MAX_CODED_SUPERFRAME_SIZE 4096
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#define MAX_CHANNELS 2
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#define NOISE_TAB_SIZE 8192
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#define LSP_POW_BITS 7
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typedef struct WMADecodeContext {
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GetBitContext gb;
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int sample_rate;
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int nb_channels;
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int bit_rate;
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int version; /* 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) */
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int block_align;
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int use_bit_reservoir;
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int use_variable_block_len;
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int use_exp_vlc; /* exponent coding: 0 = lsp, 1 = vlc + delta */
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int use_noise_coding; /* true if perceptual noise is added */
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int byte_offset_bits;
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VLC exp_vlc;
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int exponent_sizes[BLOCK_NB_SIZES];
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uint16_t exponent_bands[BLOCK_NB_SIZES][25];
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int high_band_start[BLOCK_NB_SIZES]; /* index of first coef in high band */
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int coefs_start; /* first coded coef */
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int coefs_end[BLOCK_NB_SIZES]; /* max number of coded coefficients */
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int exponent_high_sizes[BLOCK_NB_SIZES];
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int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
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VLC hgain_vlc;
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/* coded values in high bands */
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int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
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int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
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/* there are two possible tables for spectral coefficients */
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VLC coef_vlc[2];
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uint16_t *run_table[2];
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uint16_t *level_table[2];
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/* frame info */
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int frame_len; /* frame length in samples */
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int frame_len_bits; /* frame_len = 1 << frame_len_bits */
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int nb_block_sizes; /* number of block sizes */
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/* block info */
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int reset_block_lengths;
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int block_len_bits; /* log2 of current block length */
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int next_block_len_bits; /* log2 of next block length */
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int prev_block_len_bits; /* log2 of prev block length */
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int block_len; /* block length in samples */
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int block_num; /* block number in current frame */
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int block_pos; /* current position in frame */
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uint8_t ms_stereo; /* true if mid/side stereo mode */
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uint8_t channel_coded[MAX_CHANNELS]; /* true if channel is coded */
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float exponents[MAX_CHANNELS][BLOCK_MAX_SIZE] __attribute__((aligned(16)));
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float max_exponent[MAX_CHANNELS];
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int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
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float coefs[MAX_CHANNELS][BLOCK_MAX_SIZE] __attribute__((aligned(16)));
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MDCTContext mdct_ctx[BLOCK_NB_SIZES];
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float *windows[BLOCK_NB_SIZES];
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FFTSample mdct_tmp[BLOCK_MAX_SIZE] __attribute__((aligned(16))); /* temporary storage for imdct */
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/* output buffer for one frame and the last for IMDCT windowing */
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float frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2] __attribute__((aligned(16)));
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/* last frame info */
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uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
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int last_bitoffset;
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int last_superframe_len;
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float noise_table[NOISE_TAB_SIZE];
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int noise_index;
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float noise_mult; /* XXX: suppress that and integrate it in the noise array */
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/* lsp_to_curve tables */
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float lsp_cos_table[BLOCK_MAX_SIZE];
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float lsp_pow_e_table[256];
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float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
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float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
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} WMADecodeContext;
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typedef struct CoefVLCTable {
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int n; /* total number of codes */
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const uint32_t *huffcodes; /* VLC bit values */
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const uint8_t *huffbits; /* VLC bit size */
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const uint16_t *levels; /* table to build run/level tables */
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} CoefVLCTable;
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static void wma_lsp_to_curve_init(WMADecodeContext *s, int frame_len);
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#include "wmadata.h"
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#ifdef DEBUG_TRACE
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#include <stdarg.h>
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int frame_count;
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static FILE *flog;
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void trace(const char *fmt, ...)
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{
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va_list ap;
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if (!flog) {
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flog = fopen("/tmp/out.log", "w");
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setlinebuf(flog);
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}
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va_start(ap, fmt);
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vfprintf(flog, fmt, ap);
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va_end(ap);
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}
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#define get_bits(s, n) get_bits_trace(s, n)
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#define get_vlc(s, vlc) get_vlc_trace(s, vlc)
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unsigned int get_bits_trace(GetBitContext *s, int n)
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{
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unsigned int val;
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val = (get_bits)(s, n);
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trace("get_bits(%d) : 0x%x\n", n, val);
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return val;
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}
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static int get_vlc_trace(GetBitContext *s, VLC *vlc)
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{
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int code;
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code = (get_vlc)(s, vlc);
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trace("get_vlc() : %d\n", code);
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return code;
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}
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static void dump_shorts(const char *name, const short *tab, int n)
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{
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int i;
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trace("%s[%d]:\n", name, n);
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for(i=0;i<n;i++) {
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if ((i & 7) == 0)
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trace("%4d: ", i);
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trace(" %5d.0", tab[i]);
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if ((i & 7) == 7)
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trace("\n");
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}
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}
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static void dump_floats(const char *name, int prec, const float *tab, int n)
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{
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int i;
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trace("%s[%d]:\n", name, n);
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for(i=0;i<n;i++) {
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if ((i & 7) == 0)
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trace("%4d: ", i);
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trace(" %8.*f", prec, tab[i]);
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if ((i & 7) == 7)
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trace("\n");
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}
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if ((i & 7) != 0)
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trace("\n");
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}
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#else
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#define trace(fmt, ...)
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#endif
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/* XXX: use same run/length optimization as mpeg decoders */
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static void init_coef_vlc(VLC *vlc,
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uint16_t **prun_table, uint16_t **plevel_table,
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const CoefVLCTable *vlc_table)
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{
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int n = vlc_table->n;
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const uint8_t *table_bits = vlc_table->huffbits;
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const uint32_t *table_codes = vlc_table->huffcodes;
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const uint16_t *levels_table = vlc_table->levels;
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uint16_t *run_table, *level_table;
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const uint16_t *p;
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int i, l, j, level;
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init_vlc(vlc, 9, n, table_bits, 1, 1, table_codes, 4, 4);
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run_table = av_malloc(n * sizeof(uint16_t));
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level_table = av_malloc(n * sizeof(uint16_t));
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p = levels_table;
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i = 2;
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level = 1;
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while (i < n) {
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l = *p++;
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for(j=0;j<l;j++) {
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run_table[i] = j;
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level_table[i] = level;
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i++;
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}
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level++;
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}
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*prun_table = run_table;
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*plevel_table = level_table;
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}
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static int wma_decode_init(AVCodecContext * avctx)
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{
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WMADecodeContext *s = avctx->priv_data;
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int i, flags1, flags2;
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float *window;
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uint8_t *extradata;
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float bps1, high_freq, bps;
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int sample_rate1;
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int coef_vlc_table;
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s->sample_rate = avctx->sample_rate;
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s->nb_channels = avctx->channels;
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s->bit_rate = avctx->bit_rate;
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s->block_align = avctx->block_align;
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if (avctx->codec->id == CODEC_ID_WMAV1) {
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s->version = 1;
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} else {
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s->version = 2;
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}
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/* extract flag infos */
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flags1 = 0;
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flags2 = 0;
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extradata = avctx->extradata;
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if (s->version == 1 && avctx->extradata_size >= 4) {
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flags1 = extradata[0] | (extradata[1] << 8);
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flags2 = extradata[2] | (extradata[3] << 8);
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} else if (s->version == 2 && avctx->extradata_size >= 6) {
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flags1 = extradata[0] | (extradata[1] << 8) |
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(extradata[2] << 16) | (extradata[3] << 24);
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flags2 = extradata[4] | (extradata[5] << 8);
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}
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s->use_exp_vlc = flags2 & 0x0001;
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s->use_bit_reservoir = flags2 & 0x0002;
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s->use_variable_block_len = flags2 & 0x0004;
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/* compute MDCT block size */
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if (s->sample_rate <= 16000) {
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s->frame_len_bits = 9;
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} else if (s->sample_rate <= 22050 ||
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(s->sample_rate <= 32000 && s->version == 1)) {
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s->frame_len_bits = 10;
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} else {
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s->frame_len_bits = 11;
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}
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s->frame_len = 1 << s->frame_len_bits;
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if (s->use_variable_block_len) {
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int nb_max, nb;
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nb = ((flags2 >> 3) & 3) + 1;
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if ((s->bit_rate / s->nb_channels) >= 32000)
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nb += 2;
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nb_max = s->frame_len_bits - BLOCK_MIN_BITS;
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if (nb > nb_max)
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nb = nb_max;
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s->nb_block_sizes = nb + 1;
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} else {
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s->nb_block_sizes = 1;
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}
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/* init rate dependant parameters */
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s->use_noise_coding = 1;
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high_freq = s->sample_rate * 0.5;
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/* if version 2, then the rates are normalized */
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sample_rate1 = s->sample_rate;
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if (s->version == 2) {
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if (sample_rate1 >= 44100)
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sample_rate1 = 44100;
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else if (sample_rate1 >= 22050)
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sample_rate1 = 22050;
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else if (sample_rate1 >= 16000)
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sample_rate1 = 16000;
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else if (sample_rate1 >= 11025)
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sample_rate1 = 11025;
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else if (sample_rate1 >= 8000)
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sample_rate1 = 8000;
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}
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bps = (float)s->bit_rate / (float)(s->nb_channels * s->sample_rate);
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s->byte_offset_bits = av_log2((int)(bps * s->frame_len / 8.0)) + 2;
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/* compute high frequency value and choose if noise coding should
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be activated */
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bps1 = bps;
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if (s->nb_channels == 2)
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bps1 = bps * 1.6;
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if (sample_rate1 == 44100) {
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if (bps1 >= 0.61)
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s->use_noise_coding = 0;
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else
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high_freq = high_freq * 0.4;
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} else if (sample_rate1 == 22050) {
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if (bps1 >= 1.16)
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s->use_noise_coding = 0;
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else if (bps1 >= 0.72)
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high_freq = high_freq * 0.7;
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else
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high_freq = high_freq * 0.6;
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} else if (sample_rate1 == 16000) {
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if (bps > 0.5)
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high_freq = high_freq * 0.5;
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else
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high_freq = high_freq * 0.3;
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} else if (sample_rate1 == 11025) {
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high_freq = high_freq * 0.7;
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} else if (sample_rate1 == 8000) {
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if (bps <= 0.625) {
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high_freq = high_freq * 0.5;
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} else if (bps > 0.75) {
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s->use_noise_coding = 0;
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} else {
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high_freq = high_freq * 0.65;
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}
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} else {
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if (bps >= 0.8) {
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high_freq = high_freq * 0.75;
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} else if (bps >= 0.6) {
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high_freq = high_freq * 0.6;
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} else {
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high_freq = high_freq * 0.5;
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}
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}
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#ifdef DEBUG_PARAMS
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printf("flags1=0x%x flags2=0x%x\n", flags1, flags2);
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printf("version=%d channels=%d sample_rate=%d bitrate=%d block_align=%d\n",
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s->version, s->nb_channels, s->sample_rate, s->bit_rate,
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s->block_align);
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printf("bps=%f bps1=%f high_freq=%f bitoffset=%d\n",
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bps, bps1, high_freq, s->byte_offset_bits);
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printf("use_noise_coding=%d use_exp_vlc=%d nb_block_sizes=%d\n",
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s->use_noise_coding, s->use_exp_vlc, s->nb_block_sizes);
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#endif
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/* compute the scale factor band sizes for each MDCT block size */
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{
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int a, b, pos, lpos, k, block_len, i, j, n;
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const uint8_t *table;
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if (s->version == 1) {
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s->coefs_start = 3;
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} else {
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s->coefs_start = 0;
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}
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for(k = 0; k < s->nb_block_sizes; k++) {
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block_len = s->frame_len >> k;
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if (s->version == 1) {
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lpos = 0;
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for(i=0;i<25;i++) {
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a = wma_critical_freqs[i];
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b = s->sample_rate;
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pos = ((block_len * 2 * a) + (b >> 1)) / b;
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if (pos > block_len)
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pos = block_len;
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s->exponent_bands[0][i] = pos - lpos;
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if (pos >= block_len) {
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i++;
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break;
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}
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lpos = pos;
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}
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s->exponent_sizes[0] = i;
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} else {
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/* hardcoded tables */
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table = NULL;
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a = s->frame_len_bits - BLOCK_MIN_BITS - k;
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if (a < 3) {
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if (s->sample_rate >= 44100)
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table = exponent_band_44100[a];
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else if (s->sample_rate >= 32000)
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table = exponent_band_32000[a];
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else if (s->sample_rate >= 22050)
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table = exponent_band_22050[a];
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}
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if (table) {
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n = *table++;
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for(i=0;i<n;i++)
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s->exponent_bands[k][i] = table[i];
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s->exponent_sizes[k] = n;
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} else {
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j = 0;
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lpos = 0;
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for(i=0;i<25;i++) {
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a = wma_critical_freqs[i];
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b = s->sample_rate;
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pos = ((block_len * 2 * a) + (b << 1)) / (4 * b);
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pos <<= 2;
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if (pos > block_len)
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pos = block_len;
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if (pos > lpos)
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s->exponent_bands[k][j++] = pos - lpos;
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if (pos >= block_len)
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break;
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lpos = pos;
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}
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s->exponent_sizes[k] = j;
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}
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}
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/* max number of coefs */
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s->coefs_end[k] = (s->frame_len - ((s->frame_len * 9) / 100)) >> k;
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/* high freq computation */
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s->high_band_start[k] = (int)((block_len * 2 * high_freq) /
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s->sample_rate + 0.5);
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n = s->exponent_sizes[k];
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j = 0;
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pos = 0;
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for(i=0;i<n;i++) {
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int start, end;
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start = pos;
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pos += s->exponent_bands[k][i];
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end = pos;
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if (start < s->high_band_start[k])
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start = s->high_band_start[k];
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if (end > s->coefs_end[k])
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end = s->coefs_end[k];
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if (end > start)
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s->exponent_high_bands[k][j++] = end - start;
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}
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s->exponent_high_sizes[k] = j;
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#if 0
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trace("%5d: coefs_end=%d high_band_start=%d nb_high_bands=%d: ",
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s->frame_len >> k,
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s->coefs_end[k],
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s->high_band_start[k],
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s->exponent_high_sizes[k]);
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for(j=0;j<s->exponent_high_sizes[k];j++)
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trace(" %d", s->exponent_high_bands[k][j]);
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trace("\n");
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#endif
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}
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}
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#ifdef DEBUG_TRACE
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{
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int i, j;
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for(i = 0; i < s->nb_block_sizes; i++) {
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trace("%5d: n=%2d:",
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s->frame_len >> i,
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s->exponent_sizes[i]);
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for(j=0;j<s->exponent_sizes[i];j++)
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trace(" %d", s->exponent_bands[i][j]);
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|
trace("\n");
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* init MDCT */
|
|
for(i = 0; i < s->nb_block_sizes; i++)
|
|
ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 1);
|
|
|
|
/* init MDCT windows : simple sinus window */
|
|
for(i = 0; i < s->nb_block_sizes; i++) {
|
|
int n, j;
|
|
float alpha;
|
|
n = 1 << (s->frame_len_bits - i);
|
|
window = av_malloc(sizeof(float) * n);
|
|
alpha = M_PI / (2.0 * n);
|
|
for(j=0;j<n;j++) {
|
|
window[n - j - 1] = sin((j + 0.5) * alpha);
|
|
}
|
|
s->windows[i] = window;
|
|
}
|
|
|
|
s->reset_block_lengths = 1;
|
|
|
|
if (s->use_noise_coding) {
|
|
|
|
/* init the noise generator */
|
|
if (s->use_exp_vlc)
|
|
s->noise_mult = 0.02;
|
|
else
|
|
s->noise_mult = 0.04;
|
|
|
|
#if defined(DEBUG_TRACE)
|
|
for(i=0;i<NOISE_TAB_SIZE;i++)
|
|
s->noise_table[i] = 1.0 * s->noise_mult;
|
|
#else
|
|
{
|
|
unsigned int seed;
|
|
float norm;
|
|
seed = 1;
|
|
norm = (1.0 / (float)(1LL << 31)) * sqrt(3) * s->noise_mult;
|
|
for(i=0;i<NOISE_TAB_SIZE;i++) {
|
|
seed = seed * 314159 + 1;
|
|
s->noise_table[i] = (float)((int)seed) * norm;
|
|
}
|
|
}
|
|
#endif
|
|
init_vlc(&s->hgain_vlc, 9, sizeof(hgain_huffbits),
|
|
hgain_huffbits, 1, 1,
|
|
hgain_huffcodes, 2, 2);
|
|
}
|
|
|
|
if (s->use_exp_vlc) {
|
|
init_vlc(&s->exp_vlc, 9, sizeof(scale_huffbits),
|
|
scale_huffbits, 1, 1,
|
|
scale_huffcodes, 4, 4);
|
|
} else {
|
|
wma_lsp_to_curve_init(s, s->frame_len);
|
|
}
|
|
|
|
/* choose the VLC tables for the coefficients */
|
|
coef_vlc_table = 2;
|
|
if (s->sample_rate >= 32000) {
|
|
if (bps1 < 0.72)
|
|
coef_vlc_table = 0;
|
|
else if (bps1 < 1.16)
|
|
coef_vlc_table = 1;
|
|
}
|
|
|
|
init_coef_vlc(&s->coef_vlc[0], &s->run_table[0], &s->level_table[0],
|
|
&coef_vlcs[coef_vlc_table * 2]);
|
|
init_coef_vlc(&s->coef_vlc[1], &s->run_table[1], &s->level_table[1],
|
|
&coef_vlcs[coef_vlc_table * 2 + 1]);
|
|
return 0;
|
|
}
|
|
|
|
/* interpolate values for a bigger or smaller block. The block must
|
|
have multiple sizes */
|
|
static void interpolate_array(float *scale, int old_size, int new_size)
|
|
{
|
|
int i, j, jincr, k;
|
|
float v;
|
|
|
|
if (new_size > old_size) {
|
|
jincr = new_size / old_size;
|
|
j = new_size;
|
|
for(i = old_size - 1; i >=0; i--) {
|
|
v = scale[i];
|
|
k = jincr;
|
|
do {
|
|
scale[--j] = v;
|
|
} while (--k);
|
|
}
|
|
} else if (new_size < old_size) {
|
|
j = 0;
|
|
jincr = old_size / new_size;
|
|
for(i = 0; i < new_size; i++) {
|
|
scale[i] = scale[j];
|
|
j += jincr;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* compute x^-0.25 with an exponent and mantissa table. We use linear
|
|
interpolation to reduce the mantissa table size at a small speed
|
|
expense (linear interpolation approximately doubles the number of
|
|
bits of precision). */
|
|
static inline float pow_m1_4(WMADecodeContext *s, float x)
|
|
{
|
|
union {
|
|
float f;
|
|
unsigned int v;
|
|
} u, t;
|
|
unsigned int e, m;
|
|
float a, b;
|
|
|
|
u.f = x;
|
|
e = u.v >> 23;
|
|
m = (u.v >> (23 - LSP_POW_BITS)) & ((1 << LSP_POW_BITS) - 1);
|
|
/* build interpolation scale: 1 <= t < 2. */
|
|
t.v = ((u.v << LSP_POW_BITS) & ((1 << 23) - 1)) | (127 << 23);
|
|
a = s->lsp_pow_m_table1[m];
|
|
b = s->lsp_pow_m_table2[m];
|
|
return s->lsp_pow_e_table[e] * (a + b * t.f);
|
|
}
|
|
|
|
static void wma_lsp_to_curve_init(WMADecodeContext *s, int frame_len)
|
|
{
|
|
float wdel, a, b;
|
|
int i, e, m;
|
|
|
|
wdel = M_PI / frame_len;
|
|
for(i=0;i<frame_len;i++)
|
|
s->lsp_cos_table[i] = 2.0f * cos(wdel * i);
|
|
|
|
/* tables for x^-0.25 computation */
|
|
for(i=0;i<256;i++) {
|
|
e = i - 126;
|
|
s->lsp_pow_e_table[i] = pow(2.0, e * -0.25);
|
|
}
|
|
|
|
/* NOTE: these two tables are needed to avoid two operations in
|
|
pow_m1_4 */
|
|
b = 1.0;
|
|
for(i=(1 << LSP_POW_BITS) - 1;i>=0;i--) {
|
|
m = (1 << LSP_POW_BITS) + i;
|
|
a = (float)m * (0.5 / (1 << LSP_POW_BITS));
|
|
a = pow(a, -0.25);
|
|
s->lsp_pow_m_table1[i] = 2 * a - b;
|
|
s->lsp_pow_m_table2[i] = b - a;
|
|
b = a;
|
|
}
|
|
#if 0
|
|
for(i=1;i<20;i++) {
|
|
float v, r1, r2;
|
|
v = 5.0 / i;
|
|
r1 = pow_m1_4(s, v);
|
|
r2 = pow(v,-0.25);
|
|
printf("%f^-0.25=%f e=%f\n", v, r1, r2 - r1);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/* NOTE: We use the same code as Vorbis here */
|
|
/* XXX: optimize it further with SSE/3Dnow */
|
|
static void wma_lsp_to_curve(WMADecodeContext *s,
|
|
float *out, float *val_max_ptr,
|
|
int n, float *lsp)
|
|
{
|
|
int i, j;
|
|
float p, q, w, v, val_max;
|
|
|
|
val_max = 0;
|
|
for(i=0;i<n;i++) {
|
|
p = 0.5f;
|
|
q = 0.5f;
|
|
w = s->lsp_cos_table[i];
|
|
for(j=1;j<NB_LSP_COEFS;j+=2){
|
|
q *= w - lsp[j - 1];
|
|
p *= w - lsp[j];
|
|
}
|
|
p *= p * (2.0f - w);
|
|
q *= q * (2.0f + w);
|
|
v = p + q;
|
|
v = pow_m1_4(s, v);
|
|
if (v > val_max)
|
|
val_max = v;
|
|
out[i] = v;
|
|
}
|
|
*val_max_ptr = val_max;
|
|
}
|
|
|
|
/* decode exponents coded with LSP coefficients (same idea as Vorbis) */
|
|
static void decode_exp_lsp(WMADecodeContext *s, int ch)
|
|
{
|
|
float lsp_coefs[NB_LSP_COEFS];
|
|
int val, i;
|
|
|
|
for(i = 0; i < NB_LSP_COEFS; i++) {
|
|
if (i == 0 || i >= 8)
|
|
val = get_bits(&s->gb, 3);
|
|
else
|
|
val = get_bits(&s->gb, 4);
|
|
lsp_coefs[i] = lsp_codebook[i][val];
|
|
}
|
|
|
|
wma_lsp_to_curve(s, s->exponents[ch], &s->max_exponent[ch],
|
|
s->block_len, lsp_coefs);
|
|
}
|
|
|
|
/* decode exponents coded with VLC codes */
|
|
static int decode_exp_vlc(WMADecodeContext *s, int ch)
|
|
{
|
|
int last_exp, n, code;
|
|
const uint16_t *ptr, *band_ptr;
|
|
float v, *q, max_scale, *q_end;
|
|
|
|
band_ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits];
|
|
ptr = band_ptr;
|
|
q = s->exponents[ch];
|
|
q_end = q + s->block_len;
|
|
max_scale = 0;
|
|
if (s->version == 1) {
|
|
last_exp = get_bits(&s->gb, 5) + 10;
|
|
/* XXX: use a table */
|
|
v = pow(10, last_exp * (1.0 / 16.0));
|
|
max_scale = v;
|
|
n = *ptr++;
|
|
do {
|
|
*q++ = v;
|
|
} while (--n);
|
|
}
|
|
last_exp = 36;
|
|
while (q < q_end) {
|
|
code = get_vlc(&s->gb, &s->exp_vlc);
|
|
if (code < 0)
|
|
return -1;
|
|
/* NOTE: this offset is the same as MPEG4 AAC ! */
|
|
last_exp += code - 60;
|
|
/* XXX: use a table */
|
|
v = pow(10, last_exp * (1.0 / 16.0));
|
|
if (v > max_scale)
|
|
max_scale = v;
|
|
n = *ptr++;
|
|
do {
|
|
*q++ = v;
|
|
} while (--n);
|
|
}
|
|
s->max_exponent[ch] = max_scale;
|
|
return 0;
|
|
}
|
|
|
|
/* return 0 if OK. return 1 if last block of frame. return -1 if
|
|
unrecorrable error. */
|
|
static int wma_decode_block(WMADecodeContext *s)
|
|
{
|
|
int n, v, a, ch, code, bsize;
|
|
int coef_nb_bits, total_gain, parse_exponents;
|
|
float window[BLOCK_MAX_SIZE * 2];
|
|
int nb_coefs[MAX_CHANNELS];
|
|
float mdct_norm;
|
|
|
|
trace("***decode_block: %d:%d\n", frame_count - 1, s->block_num);
|
|
|
|
/* compute current block length */
|
|
if (s->use_variable_block_len) {
|
|
n = av_log2(s->nb_block_sizes - 1) + 1;
|
|
|
|
if (s->reset_block_lengths) {
|
|
s->reset_block_lengths = 0;
|
|
v = get_bits(&s->gb, n);
|
|
if (v >= s->nb_block_sizes)
|
|
return -1;
|
|
s->prev_block_len_bits = s->frame_len_bits - v;
|
|
v = get_bits(&s->gb, n);
|
|
if (v >= s->nb_block_sizes)
|
|
return -1;
|
|
s->block_len_bits = s->frame_len_bits - v;
|
|
} else {
|
|
/* update block lengths */
|
|
s->prev_block_len_bits = s->block_len_bits;
|
|
s->block_len_bits = s->next_block_len_bits;
|
|
}
|
|
v = get_bits(&s->gb, n);
|
|
if (v >= s->nb_block_sizes)
|
|
return -1;
|
|
s->next_block_len_bits = s->frame_len_bits - v;
|
|
} else {
|
|
/* fixed block len */
|
|
s->next_block_len_bits = s->frame_len_bits;
|
|
s->prev_block_len_bits = s->frame_len_bits;
|
|
s->block_len_bits = s->frame_len_bits;
|
|
}
|
|
|
|
/* now check if the block length is coherent with the frame length */
|
|
s->block_len = 1 << s->block_len_bits;
|
|
if ((s->block_pos + s->block_len) > s->frame_len)
|
|
return -1;
|
|
|
|
if (s->nb_channels == 2) {
|
|
s->ms_stereo = get_bits(&s->gb, 1);
|
|
}
|
|
v = 0;
|
|
for(ch = 0; ch < s->nb_channels; ch++) {
|
|
a = get_bits(&s->gb, 1);
|
|
s->channel_coded[ch] = a;
|
|
v |= a;
|
|
}
|
|
/* if no channel coded, no need to go further */
|
|
/* XXX: fix potential framing problems */
|
|
if (!v)
|
|
goto next;
|
|
|
|
bsize = s->frame_len_bits - s->block_len_bits;
|
|
|
|
/* read total gain and extract corresponding number of bits for
|
|
coef escape coding */
|
|
total_gain = 1;
|
|
for(;;) {
|
|
a = get_bits(&s->gb, 7);
|
|
total_gain += a;
|
|
if (a != 127)
|
|
break;
|
|
}
|
|
|
|
if (total_gain < 15)
|
|
coef_nb_bits = 13;
|
|
else if (total_gain < 32)
|
|
coef_nb_bits = 12;
|
|
else if (total_gain < 40)
|
|
coef_nb_bits = 11;
|
|
else if (total_gain < 45)
|
|
coef_nb_bits = 10;
|
|
else
|
|
coef_nb_bits = 9;
|
|
|
|
/* compute number of coefficients */
|
|
n = s->coefs_end[bsize] - s->coefs_start;
|
|
for(ch = 0; ch < s->nb_channels; ch++)
|
|
nb_coefs[ch] = n;
|
|
|
|
/* complex coding */
|
|
if (s->use_noise_coding) {
|
|
|
|
for(ch = 0; ch < s->nb_channels; ch++) {
|
|
if (s->channel_coded[ch]) {
|
|
int i, n, a;
|
|
n = s->exponent_high_sizes[bsize];
|
|
for(i=0;i<n;i++) {
|
|
a = get_bits(&s->gb, 1);
|
|
s->high_band_coded[ch][i] = a;
|
|
/* if noise coding, the coefficients are not transmitted */
|
|
if (a)
|
|
nb_coefs[ch] -= s->exponent_high_bands[bsize][i];
|
|
}
|
|
}
|
|
}
|
|
for(ch = 0; ch < s->nb_channels; ch++) {
|
|
if (s->channel_coded[ch]) {
|
|
int i, n, val, code;
|
|
|
|
n = s->exponent_high_sizes[bsize];
|
|
val = (int)0x80000000;
|
|
for(i=0;i<n;i++) {
|
|
if (s->high_band_coded[ch][i]) {
|
|
if (val == (int)0x80000000) {
|
|
val = get_bits(&s->gb, 7) - 19;
|
|
} else {
|
|
code = get_vlc(&s->gb, &s->hgain_vlc);
|
|
if (code < 0)
|
|
return -1;
|
|
val += code - 18;
|
|
}
|
|
s->high_band_values[ch][i] = val;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* exposant can be interpolated in short blocks. */
|
|
parse_exponents = 1;
|
|
if (s->block_len_bits != s->frame_len_bits) {
|
|
parse_exponents = get_bits(&s->gb, 1);
|
|
}
|
|
|
|
if (parse_exponents) {
|
|
for(ch = 0; ch < s->nb_channels; ch++) {
|
|
if (s->channel_coded[ch]) {
|
|
if (s->use_exp_vlc) {
|
|
if (decode_exp_vlc(s, ch) < 0)
|
|
return -1;
|
|
} else {
|
|
decode_exp_lsp(s, ch);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
for(ch = 0; ch < s->nb_channels; ch++) {
|
|
if (s->channel_coded[ch]) {
|
|
interpolate_array(s->exponents[ch], 1 << s->prev_block_len_bits,
|
|
s->block_len);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* parse spectral coefficients : just RLE encoding */
|
|
for(ch = 0; ch < s->nb_channels; ch++) {
|
|
if (s->channel_coded[ch]) {
|
|
VLC *coef_vlc;
|
|
int level, run, sign, tindex;
|
|
int16_t *ptr, *eptr;
|
|
const int16_t *level_table, *run_table;
|
|
|
|
/* special VLC tables are used for ms stereo because
|
|
there is potentially less energy there */
|
|
tindex = (ch == 1 && s->ms_stereo);
|
|
coef_vlc = &s->coef_vlc[tindex];
|
|
run_table = s->run_table[tindex];
|
|
level_table = s->level_table[tindex];
|
|
/* XXX: optimize */
|
|
ptr = &s->coefs1[ch][0];
|
|
eptr = ptr + nb_coefs[ch];
|
|
memset(ptr, 0, s->block_len * sizeof(int16_t));
|
|
for(;;) {
|
|
code = get_vlc(&s->gb, coef_vlc);
|
|
if (code < 0)
|
|
return -1;
|
|
if (code == 1) {
|
|
/* EOB */
|
|
break;
|
|
} else if (code == 0) {
|
|
/* escape */
|
|
level = get_bits(&s->gb, coef_nb_bits);
|
|
/* NOTE: this is rather suboptimal. reading
|
|
block_len_bits would be better */
|
|
run = get_bits(&s->gb, s->frame_len_bits);
|
|
} else {
|
|
/* normal code */
|
|
run = run_table[code];
|
|
level = level_table[code];
|
|
}
|
|
sign = get_bits(&s->gb, 1);
|
|
if (!sign)
|
|
level = -level;
|
|
ptr += run;
|
|
if (ptr >= eptr)
|
|
return -1;
|
|
*ptr++ = level;
|
|
/* NOTE: EOB can be omitted */
|
|
if (ptr >= eptr)
|
|
break;
|
|
}
|
|
}
|
|
if (s->version == 1 && s->nb_channels >= 2) {
|
|
align_get_bits(&s->gb);
|
|
}
|
|
}
|
|
|
|
/* normalize */
|
|
{
|
|
int n4 = s->block_len / 2;
|
|
mdct_norm = 1.0 / (float)n4;
|
|
if (s->version == 1) {
|
|
mdct_norm *= sqrt(n4);
|
|
}
|
|
}
|
|
|
|
/* finally compute the MDCT coefficients */
|
|
for(ch = 0; ch < s->nb_channels; ch++) {
|
|
if (s->channel_coded[ch]) {
|
|
int16_t *coefs1;
|
|
float *coefs, *exponents, mult, mult1, noise, *exp_ptr;
|
|
int i, j, n, n1, last_high_band;
|
|
float exp_power[HIGH_BAND_MAX_SIZE];
|
|
|
|
coefs1 = s->coefs1[ch];
|
|
exponents = s->exponents[ch];
|
|
mult = pow(10, total_gain * 0.05) / s->max_exponent[ch];
|
|
mult *= mdct_norm;
|
|
coefs = s->coefs[ch];
|
|
if (s->use_noise_coding) {
|
|
mult1 = mult;
|
|
/* very low freqs : noise */
|
|
for(i = 0;i < s->coefs_start; i++) {
|
|
*coefs++ = s->noise_table[s->noise_index] * (*exponents++) * mult1;
|
|
s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
|
|
}
|
|
|
|
n1 = s->exponent_high_sizes[bsize];
|
|
|
|
/* compute power of high bands */
|
|
exp_ptr = exponents +
|
|
s->high_band_start[bsize] -
|
|
s->coefs_start;
|
|
last_high_band = 0; /* avoid warning */
|
|
for(j=0;j<n1;j++) {
|
|
n = s->exponent_high_bands[s->frame_len_bits -
|
|
s->block_len_bits][j];
|
|
if (s->high_band_coded[ch][j]) {
|
|
float e2, v;
|
|
e2 = 0;
|
|
for(i = 0;i < n; i++) {
|
|
v = exp_ptr[i];
|
|
e2 += v * v;
|
|
}
|
|
exp_power[j] = e2 / n;
|
|
last_high_band = j;
|
|
trace("%d: power=%f (%d)\n", j, exp_power[j], n);
|
|
}
|
|
exp_ptr += n;
|
|
}
|
|
|
|
/* main freqs and high freqs */
|
|
for(j=-1;j<n1;j++) {
|
|
if (j < 0) {
|
|
n = s->high_band_start[bsize] -
|
|
s->coefs_start;
|
|
} else {
|
|
n = s->exponent_high_bands[s->frame_len_bits -
|
|
s->block_len_bits][j];
|
|
}
|
|
if (j >= 0 && s->high_band_coded[ch][j]) {
|
|
/* use noise with specified power */
|
|
mult1 = sqrt(exp_power[j] / exp_power[last_high_band]);
|
|
/* XXX: use a table */
|
|
mult1 = mult1 * pow(10, s->high_band_values[ch][j] * 0.05);
|
|
mult1 = mult1 / (s->max_exponent[ch] * s->noise_mult);
|
|
mult1 *= mdct_norm;
|
|
for(i = 0;i < n; i++) {
|
|
noise = s->noise_table[s->noise_index];
|
|
s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
|
|
*coefs++ = (*exponents++) * noise * mult1;
|
|
}
|
|
} else {
|
|
/* coded values + small noise */
|
|
for(i = 0;i < n; i++) {
|
|
noise = s->noise_table[s->noise_index];
|
|
s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
|
|
*coefs++ = ((*coefs1++) + noise) * (*exponents++) * mult;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* very high freqs : noise */
|
|
n = s->block_len - s->coefs_end[bsize];
|
|
mult1 = mult * exponents[-1];
|
|
for(i = 0; i < n; i++) {
|
|
*coefs++ = s->noise_table[s->noise_index] * mult1;
|
|
s->noise_index = (s->noise_index + 1) & (NOISE_TAB_SIZE - 1);
|
|
}
|
|
} else {
|
|
/* XXX: optimize more */
|
|
for(i = 0;i < s->coefs_start; i++)
|
|
*coefs++ = 0.0;
|
|
n = nb_coefs[ch];
|
|
for(i = 0;i < n; i++) {
|
|
*coefs++ = coefs1[i] * exponents[i] * mult;
|
|
}
|
|
n = s->block_len - s->coefs_end[bsize];
|
|
for(i = 0;i < n; i++)
|
|
*coefs++ = 0.0;
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG_TRACE
|
|
for(ch = 0; ch < s->nb_channels; ch++) {
|
|
if (s->channel_coded[ch]) {
|
|
dump_floats("exponents", 3, s->exponents[ch], s->block_len);
|
|
dump_floats("coefs", 1, s->coefs[ch], s->block_len);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (s->ms_stereo && s->channel_coded[1]) {
|
|
float a, b;
|
|
int i;
|
|
|
|
/* nominal case for ms stereo: we do it before mdct */
|
|
/* no need to optimize this case because it should almost
|
|
never happen */
|
|
if (!s->channel_coded[0]) {
|
|
#ifdef DEBUG_TRACE
|
|
trace("rare ms-stereo case happened\n");
|
|
#endif
|
|
memset(s->coefs[0], 0, sizeof(float) * s->block_len);
|
|
s->channel_coded[0] = 1;
|
|
}
|
|
|
|
for(i = 0; i < s->block_len; i++) {
|
|
a = s->coefs[0][i];
|
|
b = s->coefs[1][i];
|
|
s->coefs[0][i] = a + b;
|
|
s->coefs[1][i] = a - b;
|
|
}
|
|
}
|
|
|
|
/* build the window : we ensure that when the windows overlap
|
|
their squared sum is always 1 (MDCT reconstruction rule) */
|
|
/* XXX: merge with output */
|
|
{
|
|
int i, next_block_len, block_len, prev_block_len, n;
|
|
float *wptr;
|
|
|
|
block_len = s->block_len;
|
|
prev_block_len = 1 << s->prev_block_len_bits;
|
|
next_block_len = 1 << s->next_block_len_bits;
|
|
|
|
/* right part */
|
|
wptr = window + block_len;
|
|
if (block_len <= next_block_len) {
|
|
for(i=0;i<block_len;i++)
|
|
*wptr++ = s->windows[bsize][i];
|
|
} else {
|
|
/* overlap */
|
|
n = (block_len / 2) - (next_block_len / 2);
|
|
for(i=0;i<n;i++)
|
|
*wptr++ = 1.0;
|
|
for(i=0;i<next_block_len;i++)
|
|
*wptr++ = s->windows[s->frame_len_bits - s->next_block_len_bits][i];
|
|
for(i=0;i<n;i++)
|
|
*wptr++ = 0.0;
|
|
}
|
|
|
|
/* left part */
|
|
wptr = window + block_len;
|
|
if (block_len <= prev_block_len) {
|
|
for(i=0;i<block_len;i++)
|
|
*--wptr = s->windows[bsize][i];
|
|
} else {
|
|
/* overlap */
|
|
n = (block_len / 2) - (prev_block_len / 2);
|
|
for(i=0;i<n;i++)
|
|
*--wptr = 1.0;
|
|
for(i=0;i<prev_block_len;i++)
|
|
*--wptr = s->windows[s->frame_len_bits - s->prev_block_len_bits][i];
|
|
for(i=0;i<n;i++)
|
|
*--wptr = 0.0;
|
|
}
|
|
}
|
|
|
|
|
|
for(ch = 0; ch < s->nb_channels; ch++) {
|
|
if (s->channel_coded[ch]) {
|
|
FFTSample output[BLOCK_MAX_SIZE * 2] __attribute__((aligned(16)));
|
|
float *ptr;
|
|
int i, n4, index, n;
|
|
|
|
n = s->block_len;
|
|
n4 = s->block_len / 2;
|
|
ff_imdct_calc(&s->mdct_ctx[bsize],
|
|
output, s->coefs[ch], s->mdct_tmp);
|
|
|
|
/* XXX: optimize all that by build the window and
|
|
multipying/adding at the same time */
|
|
/* multiply by the window */
|
|
for(i=0;i<n * 2;i++) {
|
|
output[i] *= window[i];
|
|
}
|
|
|
|
/* add in the frame */
|
|
index = (s->frame_len / 2) + s->block_pos - n4;
|
|
ptr = &s->frame_out[ch][index];
|
|
for(i=0;i<n * 2;i++) {
|
|
*ptr += output[i];
|
|
ptr++;
|
|
}
|
|
|
|
/* specific fast case for ms-stereo : add to second
|
|
channel if it is not coded */
|
|
if (s->ms_stereo && !s->channel_coded[1]) {
|
|
ptr = &s->frame_out[1][index];
|
|
for(i=0;i<n * 2;i++) {
|
|
*ptr += output[i];
|
|
ptr++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
next:
|
|
/* update block number */
|
|
s->block_num++;
|
|
s->block_pos += s->block_len;
|
|
if (s->block_pos >= s->frame_len)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/* decode a frame of frame_len samples */
|
|
static int wma_decode_frame(WMADecodeContext *s, int16_t *samples)
|
|
{
|
|
int ret, i, n, a, ch, incr;
|
|
int16_t *ptr;
|
|
float *iptr;
|
|
|
|
trace("***decode_frame: %d size=%d\n", frame_count++, s->frame_len);
|
|
|
|
/* read each block */
|
|
s->block_num = 0;
|
|
s->block_pos = 0;
|
|
for(;;) {
|
|
ret = wma_decode_block(s);
|
|
if (ret < 0)
|
|
return -1;
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
/* convert frame to integer */
|
|
n = s->frame_len;
|
|
incr = s->nb_channels;
|
|
for(ch = 0; ch < s->nb_channels; ch++) {
|
|
ptr = samples + ch;
|
|
iptr = s->frame_out[ch];
|
|
|
|
for(i=0;i<n;i++) {
|
|
a = lrintf(*iptr++);
|
|
if (a > 32767)
|
|
a = 32767;
|
|
else if (a < -32768)
|
|
a = -32768;
|
|
*ptr = a;
|
|
ptr += incr;
|
|
}
|
|
/* prepare for next block */
|
|
memmove(&s->frame_out[ch][0], &s->frame_out[ch][s->frame_len],
|
|
s->frame_len * sizeof(float));
|
|
/* XXX: suppress this */
|
|
memset(&s->frame_out[ch][s->frame_len], 0,
|
|
s->frame_len * sizeof(float));
|
|
}
|
|
|
|
#ifdef DEBUG_TRACE
|
|
dump_shorts("samples", samples, n * s->nb_channels);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int wma_decode_superframe(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
UINT8 *buf, int buf_size)
|
|
{
|
|
WMADecodeContext *s = avctx->priv_data;
|
|
int nb_frames, bit_offset, i, pos, len;
|
|
uint8_t *q;
|
|
int16_t *samples;
|
|
|
|
trace("***decode_superframe:\n");
|
|
|
|
samples = data;
|
|
|
|
init_get_bits(&s->gb, buf, buf_size*8);
|
|
|
|
if (s->use_bit_reservoir) {
|
|
/* read super frame header */
|
|
get_bits(&s->gb, 4); /* super frame index */
|
|
nb_frames = get_bits(&s->gb, 4) - 1;
|
|
|
|
bit_offset = get_bits(&s->gb, s->byte_offset_bits + 3);
|
|
|
|
if (s->last_superframe_len > 0) {
|
|
// printf("skip=%d\n", s->last_bitoffset);
|
|
/* add bit_offset bits to last frame */
|
|
if ((s->last_superframe_len + ((bit_offset + 7) >> 3)) >
|
|
MAX_CODED_SUPERFRAME_SIZE)
|
|
goto fail;
|
|
q = s->last_superframe + s->last_superframe_len;
|
|
len = bit_offset;
|
|
while (len > 0) {
|
|
*q++ = (get_bits)(&s->gb, 8);
|
|
len -= 8;
|
|
}
|
|
if (len > 0) {
|
|
*q++ = (get_bits)(&s->gb, len) << (8 - len);
|
|
}
|
|
|
|
/* XXX: bit_offset bits into last frame */
|
|
init_get_bits(&s->gb, s->last_superframe, MAX_CODED_SUPERFRAME_SIZE*8);
|
|
/* skip unused bits */
|
|
if (s->last_bitoffset > 0)
|
|
skip_bits(&s->gb, s->last_bitoffset);
|
|
/* this frame is stored in the last superframe and in the
|
|
current one */
|
|
if (wma_decode_frame(s, samples) < 0)
|
|
goto fail;
|
|
samples += s->nb_channels * s->frame_len;
|
|
}
|
|
|
|
/* read each frame starting from bit_offset */
|
|
pos = bit_offset + 4 + 4 + s->byte_offset_bits + 3;
|
|
init_get_bits(&s->gb, buf + (pos >> 3), (MAX_CODED_SUPERFRAME_SIZE - (pos >> 3))*8);
|
|
len = pos & 7;
|
|
if (len > 0)
|
|
skip_bits(&s->gb, len);
|
|
|
|
s->reset_block_lengths = 1;
|
|
for(i=0;i<nb_frames;i++) {
|
|
if (wma_decode_frame(s, samples) < 0)
|
|
goto fail;
|
|
samples += s->nb_channels * s->frame_len;
|
|
}
|
|
|
|
/* we copy the end of the frame in the last frame buffer */
|
|
pos = get_bits_count(&s->gb) + ((bit_offset + 4 + 4 + s->byte_offset_bits + 3) & ~7);
|
|
s->last_bitoffset = pos & 7;
|
|
pos >>= 3;
|
|
len = buf_size - pos;
|
|
if (len > MAX_CODED_SUPERFRAME_SIZE || len < 0) {
|
|
goto fail;
|
|
}
|
|
s->last_superframe_len = len;
|
|
memcpy(s->last_superframe, buf + pos, len);
|
|
} else {
|
|
/* single frame decode */
|
|
if (wma_decode_frame(s, samples) < 0)
|
|
goto fail;
|
|
samples += s->nb_channels * s->frame_len;
|
|
}
|
|
*data_size = (int8_t *)samples - (int8_t *)data;
|
|
return s->block_align;
|
|
fail:
|
|
/* when error, we reset the bit reservoir */
|
|
s->last_superframe_len = 0;
|
|
return -1;
|
|
}
|
|
|
|
static int wma_decode_end(AVCodecContext *avctx)
|
|
{
|
|
WMADecodeContext *s = avctx->priv_data;
|
|
int i;
|
|
|
|
for(i = 0; i < s->nb_block_sizes; i++)
|
|
ff_mdct_end(&s->mdct_ctx[i]);
|
|
for(i = 0; i < s->nb_block_sizes; i++)
|
|
av_free(s->windows[i]);
|
|
|
|
if (s->use_exp_vlc) {
|
|
free_vlc(&s->exp_vlc);
|
|
}
|
|
if (s->use_noise_coding) {
|
|
free_vlc(&s->hgain_vlc);
|
|
}
|
|
for(i = 0;i < 2; i++) {
|
|
free_vlc(&s->coef_vlc[i]);
|
|
av_free(s->run_table[i]);
|
|
av_free(s->level_table[i]);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec wmav1_decoder =
|
|
{
|
|
"wmav1",
|
|
CODEC_TYPE_AUDIO,
|
|
CODEC_ID_WMAV1,
|
|
sizeof(WMADecodeContext),
|
|
wma_decode_init,
|
|
NULL,
|
|
wma_decode_end,
|
|
wma_decode_superframe,
|
|
};
|
|
|
|
AVCodec wmav2_decoder =
|
|
{
|
|
"wmav2",
|
|
CODEC_TYPE_AUDIO,
|
|
CODEC_ID_WMAV2,
|
|
sizeof(WMADecodeContext),
|
|
wma_decode_init,
|
|
NULL,
|
|
wma_decode_end,
|
|
wma_decode_superframe,
|
|
};
|