379 lines
14 KiB
C
379 lines
14 KiB
C
/*
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* H.26L/H.264/AVC/JVT/14496-10/... sei decoding
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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* H.264 / AVC / MPEG4 part10 sei decoding.
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* @author Michael Niedermayer <michaelni@gmx.at>
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*/
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#include "internal.h"
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#include "avcodec.h"
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#include "h264.h"
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#include "golomb.h"
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#include <assert.h>
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static const uint8_t sei_num_clock_ts_table[9] = {
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1, 1, 1, 2, 2, 3, 3, 2, 3
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};
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void ff_h264_reset_sei(H264Context *h)
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{
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h->sei_recovery_frame_cnt = -1;
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h->sei_dpb_output_delay = 0;
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h->sei_cpb_removal_delay = -1;
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h->sei_buffering_period_present = 0;
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}
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static int decode_picture_timing(H264Context *h)
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{
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SPS *sps = &h->sps;
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int i;
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for (i = 0; i<MAX_SPS_COUNT; i++)
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if (!sps->log2_max_frame_num && h->sps_buffers[i])
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sps = h->sps_buffers[i];
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if (sps->nal_hrd_parameters_present_flag || sps->vcl_hrd_parameters_present_flag) {
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h->sei_cpb_removal_delay = get_bits_long(&h->gb,
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sps->cpb_removal_delay_length);
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h->sei_dpb_output_delay = get_bits_long(&h->gb,
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sps->dpb_output_delay_length);
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}
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if (sps->pic_struct_present_flag) {
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unsigned int i, num_clock_ts;
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h->sei_pic_struct = get_bits(&h->gb, 4);
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h->sei_ct_type = 0;
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if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
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return AVERROR_INVALIDDATA;
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num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
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for (i = 0; i < num_clock_ts; i++) {
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if (get_bits(&h->gb, 1)) { /* clock_timestamp_flag */
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unsigned int full_timestamp_flag;
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h->sei_ct_type |= 1 << get_bits(&h->gb, 2);
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skip_bits(&h->gb, 1); /* nuit_field_based_flag */
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skip_bits(&h->gb, 5); /* counting_type */
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full_timestamp_flag = get_bits(&h->gb, 1);
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skip_bits(&h->gb, 1); /* discontinuity_flag */
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skip_bits(&h->gb, 1); /* cnt_dropped_flag */
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skip_bits(&h->gb, 8); /* n_frames */
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if (full_timestamp_flag) {
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skip_bits(&h->gb, 6); /* seconds_value 0..59 */
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skip_bits(&h->gb, 6); /* minutes_value 0..59 */
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skip_bits(&h->gb, 5); /* hours_value 0..23 */
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} else {
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if (get_bits(&h->gb, 1)) { /* seconds_flag */
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skip_bits(&h->gb, 6); /* seconds_value range 0..59 */
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if (get_bits(&h->gb, 1)) { /* minutes_flag */
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skip_bits(&h->gb, 6); /* minutes_value 0..59 */
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if (get_bits(&h->gb, 1)) /* hours_flag */
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skip_bits(&h->gb, 5); /* hours_value 0..23 */
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}
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}
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}
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if (sps->time_offset_length > 0)
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skip_bits(&h->gb,
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sps->time_offset_length); /* time_offset */
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}
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}
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if (h->avctx->debug & FF_DEBUG_PICT_INFO)
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av_log(h->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
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h->sei_ct_type, h->sei_pic_struct);
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}
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return 0;
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}
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static int decode_user_data_itu_t_t35(H264Context *h, int size)
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{
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uint32_t user_identifier;
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int dtg_active_format;
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if (size < 7)
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return -1;
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size -= 7;
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skip_bits(&h->gb, 8); // country_code
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skip_bits(&h->gb, 16); // provider_code
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user_identifier = get_bits_long(&h->gb, 32);
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switch (user_identifier) {
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case 0x44544731: // "DTG1" - AFD_data
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if (size < 1)
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return -1;
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skip_bits(&h->gb, 1);
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if (get_bits(&h->gb, 1)) {
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skip_bits(&h->gb, 6);
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if (size < 2)
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return -1;
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skip_bits(&h->gb, 4);
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dtg_active_format = get_bits(&h->gb, 4);
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h->avctx->dtg_active_format = dtg_active_format;
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} else {
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skip_bits(&h->gb, 6);
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}
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break;
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default:
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skip_bits(&h->gb, size * 8);
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break;
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}
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return 0;
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}
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static int decode_unregistered_user_data(H264Context *h, int size)
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{
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uint8_t user_data[16 + 256];
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int e, build, i;
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if (size < 16)
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return AVERROR_INVALIDDATA;
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for (i = 0; i < sizeof(user_data) - 1 && i < size; i++)
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user_data[i] = get_bits(&h->gb, 8);
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user_data[i] = 0;
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e = sscanf(user_data + 16, "x264 - core %d", &build);
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if (e == 1 && build > 0)
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h->x264_build = build;
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if (e == 1 && build == 1 && !strncmp(user_data+16, "x264 - core 0000", 16))
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h->x264_build = 67;
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if (h->avctx->debug & FF_DEBUG_BUGS)
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av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data + 16);
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for (; i < size; i++)
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skip_bits(&h->gb, 8);
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return 0;
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}
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static int decode_recovery_point(H264Context *h)
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{
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h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb);
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/* 1b exact_match_flag,
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* 1b broken_link_flag,
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* 2b changing_slice_group_idc */
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skip_bits(&h->gb, 4);
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if (h->avctx->debug & FF_DEBUG_PICT_INFO)
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av_log(h->avctx, AV_LOG_DEBUG, "sei_recovery_frame_cnt: %d\n", h->sei_recovery_frame_cnt);
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return 0;
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}
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static int decode_buffering_period(H264Context *h)
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{
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unsigned int sps_id;
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int sched_sel_idx;
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SPS *sps;
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sps_id = get_ue_golomb_31(&h->gb);
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if (sps_id > 31 || !h->sps_buffers[sps_id]) {
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av_log(h->avctx, AV_LOG_ERROR,
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"non-existing SPS %d referenced in buffering period\n", sps_id);
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return AVERROR_INVALIDDATA;
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}
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sps = h->sps_buffers[sps_id];
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// NOTE: This is really so duplicated in the standard... See H.264, D.1.1
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if (sps->nal_hrd_parameters_present_flag) {
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for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
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h->initial_cpb_removal_delay[sched_sel_idx] =
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get_bits_long(&h->gb, sps->initial_cpb_removal_delay_length);
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// initial_cpb_removal_delay_offset
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skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
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}
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}
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if (sps->vcl_hrd_parameters_present_flag) {
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for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
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h->initial_cpb_removal_delay[sched_sel_idx] =
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get_bits_long(&h->gb, sps->initial_cpb_removal_delay_length);
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// initial_cpb_removal_delay_offset
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skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
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}
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}
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h->sei_buffering_period_present = 1;
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return 0;
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}
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static int decode_frame_packing(H264Context *h, int size) {
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int bits = get_bits_left(&h->gb);
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h->sei_fpa.frame_packing_arrangement_id = get_ue_golomb(&h->gb);
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h->sei_fpa.frame_packing_arrangement_cancel_flag = get_bits(&h->gb, 1);
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if (!h->sei_fpa.frame_packing_arrangement_cancel_flag) {
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h->sei_fpa.frame_packing_arrangement_type = get_bits(&h->gb, 7);
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h->sei_fpa.quincunx_sampling_flag = get_bits(&h->gb, 1);
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h->sei_fpa.content_interpretation_type = get_bits(&h->gb, 6);
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skip_bits(&h->gb, 1); /* spatial_flipping_flag */
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skip_bits(&h->gb, 1); /* frame0_flipped_flag */
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skip_bits(&h->gb, 1); /* field_views_flag */
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skip_bits(&h->gb, 1); /* current_frame_is_frame0_flag */
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skip_bits(&h->gb, 1); /* frame0_self_contained_flag */
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skip_bits(&h->gb, 1); /* frame1_self_contained_flag */
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if (!h->sei_fpa.quincunx_sampling_flag && h->sei_fpa.frame_packing_arrangement_type != 5) {
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skip_bits(&h->gb, 4); /* frame0_grid_position_x */
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skip_bits(&h->gb, 4); /* frame0_grid_position_y */
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skip_bits(&h->gb, 4); /* frame1_grid_position_x */
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skip_bits(&h->gb, 4); /* frame1_grid_position_y */
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}
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skip_bits(&h->gb, 8); /* frame_packing_arrangement_reserved_byte */
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h->sei_fpa.frame_packing_arrangement_repetition_period = get_ue_golomb(&h->gb) /* frame_packing_arrangement_repetition_period */;
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}
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skip_bits(&h->gb, 1); /* frame_packing_arrangement_extension_flag */
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if (h->avctx->debug & FF_DEBUG_PICT_INFO)
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av_log(h->avctx, AV_LOG_DEBUG, "SEI FPA %d %d %d %d %d %d\n",
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h->sei_fpa.frame_packing_arrangement_id,
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h->sei_fpa.frame_packing_arrangement_cancel_flag,
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h->sei_fpa.frame_packing_arrangement_type,
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h->sei_fpa.quincunx_sampling_flag,
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h->sei_fpa.content_interpretation_type,
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h->sei_fpa.frame_packing_arrangement_repetition_period);
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skip_bits_long(&h->gb, 8 * size - (bits - get_bits_left(&h->gb)));
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return 0;
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}
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int ff_h264_decode_sei(H264Context *h)
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{
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while (get_bits_left(&h->gb) > 16) {
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int type = 0;
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unsigned size = 0;
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unsigned next;
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int ret = 0;
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do {
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if (get_bits_left(&h->gb) < 8)
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return AVERROR_INVALIDDATA;
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type += show_bits(&h->gb, 8);
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} while (get_bits(&h->gb, 8) == 255);
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do {
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if (get_bits_left(&h->gb) < 8)
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return AVERROR_INVALIDDATA;
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size += show_bits(&h->gb, 8);
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} while (get_bits(&h->gb, 8) == 255);
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if (h->avctx->debug&FF_DEBUG_STARTCODE)
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av_log(h->avctx, AV_LOG_DEBUG, "SEI %d len:%d\n", type, size);
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if (size > get_bits_left(&h->gb) / 8) {
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av_log(h->avctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
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type, 8*size, get_bits_left(&h->gb));
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return AVERROR_INVALIDDATA;
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}
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next = get_bits_count(&h->gb) + 8 * size;
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switch (type) {
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case SEI_TYPE_PIC_TIMING: // Picture timing SEI
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ret = decode_picture_timing(h);
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if (ret < 0)
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return ret;
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break;
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case SEI_TYPE_USER_DATA_ITU_T_T35:
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if (decode_user_data_itu_t_t35(h, size) < 0)
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return -1;
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break;
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case SEI_TYPE_USER_DATA_UNREGISTERED:
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ret = decode_unregistered_user_data(h, size);
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if (ret < 0)
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return ret;
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break;
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case SEI_TYPE_RECOVERY_POINT:
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ret = decode_recovery_point(h);
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if (ret < 0)
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return ret;
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break;
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case SEI_BUFFERING_PERIOD:
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ret = decode_buffering_period(h);
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if (ret < 0)
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return ret;
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break;
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case SEI_TYPE_FRAME_PACKING:
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if (decode_frame_packing(h, size) < 0)
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return -1;
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break;
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default:
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av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
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}
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skip_bits_long(&h->gb, next - get_bits_count(&h->gb));
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// FIXME check bits here
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align_get_bits(&h->gb);
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}
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return 0;
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}
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const char* ff_h264_sei_stereo_mode(H264Context *h)
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{
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if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 0) {
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switch (h->sei_fpa.frame_packing_arrangement_type) {
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case SEI_FPA_TYPE_CHECKERBOARD:
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if (h->sei_fpa.content_interpretation_type == 2)
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return "checkerboard_rl";
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else
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return "checkerboard_lr";
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case SEI_FPA_TYPE_INTERLEAVE_COLUMN:
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if (h->sei_fpa.content_interpretation_type == 2)
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return "col_interleaved_rl";
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else
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return "col_interleaved_lr";
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case SEI_FPA_TYPE_INTERLEAVE_ROW:
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if (h->sei_fpa.content_interpretation_type == 2)
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return "row_interleaved_rl";
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else
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return "row_interleaved_lr";
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case SEI_FPA_TYPE_SIDE_BY_SIDE:
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if (h->sei_fpa.content_interpretation_type == 2)
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return "right_left";
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else
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return "left_right";
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case SEI_FPA_TYPE_TOP_BOTTOM:
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if (h->sei_fpa.content_interpretation_type == 2)
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return "bottom_top";
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else
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return "top_bottom";
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case SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
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if (h->sei_fpa.content_interpretation_type == 2)
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return "block_rl";
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else
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return "block_lr";
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case SEI_FPA_TYPE_2D:
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default:
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return "mono";
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}
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} else if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 1) {
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return "mono";
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} else {
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return NULL;
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}
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}
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