mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-10 09:31:06 +02:00
![Michael Niedermayer](/assets/img/avatar_default.png)
* qatar/master: (31 commits) cdxl demux: do not create packets with uninitialized data at EOF. Replace computations of remaining bits with calls to get_bits_left(). amrnb/amrwb: Remove get_bits usage. cosmetics: reindent avformat: do not require a pixel/sample format if there is no decoder avformat: do not fill-in audio packet duration in compute_pkt_fields() lavf: Use av_get_audio_frame_duration() in get_audio_frame_size() dca_parser: parse the sample rate and frame durations libspeexdec: do not set AVCodecContext.frame_size libopencore-amr: do not set AVCodecContext.frame_size alsdec: do not set AVCodecContext.frame_size siff: do not set AVCodecContext.frame_size amr demuxer: do not set AVCodecContext.frame_size. aiffdec: do not set AVCodecContext.frame_size mov: do not set AVCodecContext.frame_size ape: do not set AVCodecContext.frame_size. rdt: remove workaround for infinite loop with aac avformat: do not require frame_size in avformat_find_stream_info() for CELT avformat: do not require frame_size in avformat_find_stream_info() for MP1/2/3 avformat: do not require frame_size in avformat_find_stream_info() for AAC ... Conflicts: doc/APIchanges libavcodec/Makefile libavcodec/avcodec.h libavcodec/h264.c libavcodec/h264_ps.c libavcodec/utils.c libavcodec/version.h libavcodec/x86/dsputil_mmx.c libavformat/utils.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
214 lines
7.4 KiB
C
214 lines
7.4 KiB
C
/*
|
|
* H.26L/H.264/AVC/JVT/14496-10/... sei decoding
|
|
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* H.264 / AVC / MPEG4 part10 sei decoding.
|
|
* @author Michael Niedermayer <michaelni@gmx.at>
|
|
*/
|
|
|
|
#include "internal.h"
|
|
#include "avcodec.h"
|
|
#include "h264.h"
|
|
#include "golomb.h"
|
|
|
|
//#undef NDEBUG
|
|
#include <assert.h>
|
|
|
|
static const uint8_t sei_num_clock_ts_table[9]={
|
|
1, 1, 1, 2, 2, 3, 3, 2, 3
|
|
};
|
|
|
|
void ff_h264_reset_sei(H264Context *h) {
|
|
h->sei_recovery_frame_cnt = -1;
|
|
h->sei_dpb_output_delay = 0;
|
|
h->sei_cpb_removal_delay = -1;
|
|
h->sei_buffering_period_present = 0;
|
|
}
|
|
|
|
static int decode_picture_timing(H264Context *h){
|
|
MpegEncContext * const s = &h->s;
|
|
if(h->sps.nal_hrd_parameters_present_flag || h->sps.vcl_hrd_parameters_present_flag){
|
|
h->sei_cpb_removal_delay = get_bits(&s->gb, h->sps.cpb_removal_delay_length);
|
|
h->sei_dpb_output_delay = get_bits(&s->gb, h->sps.dpb_output_delay_length);
|
|
}
|
|
if(h->sps.pic_struct_present_flag){
|
|
unsigned int i, num_clock_ts;
|
|
h->sei_pic_struct = get_bits(&s->gb, 4);
|
|
h->sei_ct_type = 0;
|
|
|
|
if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
|
|
return -1;
|
|
|
|
num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
|
|
|
|
for (i = 0 ; i < num_clock_ts ; i++){
|
|
if(get_bits(&s->gb, 1)){ /* clock_timestamp_flag */
|
|
unsigned int full_timestamp_flag;
|
|
h->sei_ct_type |= 1<<get_bits(&s->gb, 2);
|
|
skip_bits(&s->gb, 1); /* nuit_field_based_flag */
|
|
skip_bits(&s->gb, 5); /* counting_type */
|
|
full_timestamp_flag = get_bits(&s->gb, 1);
|
|
skip_bits(&s->gb, 1); /* discontinuity_flag */
|
|
skip_bits(&s->gb, 1); /* cnt_dropped_flag */
|
|
skip_bits(&s->gb, 8); /* n_frames */
|
|
if(full_timestamp_flag){
|
|
skip_bits(&s->gb, 6); /* seconds_value 0..59 */
|
|
skip_bits(&s->gb, 6); /* minutes_value 0..59 */
|
|
skip_bits(&s->gb, 5); /* hours_value 0..23 */
|
|
}else{
|
|
if(get_bits(&s->gb, 1)){ /* seconds_flag */
|
|
skip_bits(&s->gb, 6); /* seconds_value range 0..59 */
|
|
if(get_bits(&s->gb, 1)){ /* minutes_flag */
|
|
skip_bits(&s->gb, 6); /* minutes_value 0..59 */
|
|
if(get_bits(&s->gb, 1)) /* hours_flag */
|
|
skip_bits(&s->gb, 5); /* hours_value 0..23 */
|
|
}
|
|
}
|
|
}
|
|
if(h->sps.time_offset_length > 0)
|
|
skip_bits(&s->gb, h->sps.time_offset_length); /* time_offset */
|
|
}
|
|
}
|
|
|
|
if(s->avctx->debug & FF_DEBUG_PICT_INFO)
|
|
av_log(s->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n", h->sei_ct_type, h->sei_pic_struct);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int decode_unregistered_user_data(H264Context *h, int size){
|
|
MpegEncContext * const s = &h->s;
|
|
uint8_t user_data[16+256];
|
|
int e, build, i;
|
|
|
|
if(size<16)
|
|
return -1;
|
|
|
|
for(i=0; i<sizeof(user_data)-1 && i<size; i++){
|
|
user_data[i]= get_bits(&s->gb, 8);
|
|
}
|
|
|
|
user_data[i]= 0;
|
|
e= sscanf(user_data+16, "x264 - core %d"/*%s - H.264/MPEG-4 AVC codec - Copyleft 2005 - http://www.videolan.org/x264.html*/, &build);
|
|
if(e==1 && build>0)
|
|
h->x264_build= build;
|
|
|
|
if(s->avctx->debug & FF_DEBUG_BUGS)
|
|
av_log(s->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data+16);
|
|
|
|
for(; i<size; i++)
|
|
skip_bits(&s->gb, 8);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_recovery_point(H264Context *h){
|
|
MpegEncContext * const s = &h->s;
|
|
|
|
h->sei_recovery_frame_cnt = get_ue_golomb(&s->gb);
|
|
skip_bits(&s->gb, 4); /* 1b exact_match_flag, 1b broken_link_flag, 2b changing_slice_group_idc */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_buffering_period(H264Context *h){
|
|
MpegEncContext * const s = &h->s;
|
|
unsigned int sps_id;
|
|
int sched_sel_idx;
|
|
SPS *sps;
|
|
|
|
sps_id = get_ue_golomb_31(&s->gb);
|
|
if(sps_id > 31 || !h->sps_buffers[sps_id]) {
|
|
av_log(h->s.avctx, AV_LOG_ERROR, "non-existing SPS %d referenced in buffering period\n", sps_id);
|
|
return -1;
|
|
}
|
|
sps = h->sps_buffers[sps_id];
|
|
|
|
// NOTE: This is really so duplicated in the standard... See H.264, D.1.1
|
|
if (sps->nal_hrd_parameters_present_flag) {
|
|
for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
|
|
h->initial_cpb_removal_delay[sched_sel_idx] = get_bits(&s->gb, sps->initial_cpb_removal_delay_length);
|
|
skip_bits(&s->gb, sps->initial_cpb_removal_delay_length); // initial_cpb_removal_delay_offset
|
|
}
|
|
}
|
|
if (sps->vcl_hrd_parameters_present_flag) {
|
|
for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
|
|
h->initial_cpb_removal_delay[sched_sel_idx] = get_bits(&s->gb, sps->initial_cpb_removal_delay_length);
|
|
skip_bits(&s->gb, sps->initial_cpb_removal_delay_length); // initial_cpb_removal_delay_offset
|
|
}
|
|
}
|
|
|
|
h->sei_buffering_period_present = 1;
|
|
return 0;
|
|
}
|
|
|
|
int ff_h264_decode_sei(H264Context *h){
|
|
MpegEncContext * const s = &h->s;
|
|
|
|
while (get_bits_left(&s->gb) > 16) {
|
|
int size, type;
|
|
|
|
type=0;
|
|
do{
|
|
if (get_bits_left(&s->gb) < 8)
|
|
return -1;
|
|
type+= show_bits(&s->gb, 8);
|
|
}while(get_bits(&s->gb, 8) == 255);
|
|
|
|
size=0;
|
|
do{
|
|
if (get_bits_left(&s->gb) < 8)
|
|
return -1;
|
|
size+= show_bits(&s->gb, 8);
|
|
}while(get_bits(&s->gb, 8) == 255);
|
|
|
|
if(s->avctx->debug&FF_DEBUG_STARTCODE)
|
|
av_log(h->s.avctx, AV_LOG_DEBUG, "SEI %d len:%d\n", type, size);
|
|
|
|
switch(type){
|
|
case SEI_TYPE_PIC_TIMING: // Picture timing SEI
|
|
if(decode_picture_timing(h) < 0)
|
|
return -1;
|
|
break;
|
|
case SEI_TYPE_USER_DATA_UNREGISTERED:
|
|
if(decode_unregistered_user_data(h, size) < 0)
|
|
return -1;
|
|
break;
|
|
case SEI_TYPE_RECOVERY_POINT:
|
|
if(decode_recovery_point(h) < 0)
|
|
return -1;
|
|
break;
|
|
case SEI_BUFFERING_PERIOD:
|
|
if(decode_buffering_period(h) < 0)
|
|
return -1;
|
|
break;
|
|
default:
|
|
skip_bits(&s->gb, 8*size);
|
|
}
|
|
|
|
//FIXME check bits here
|
|
align_get_bits(&s->gb);
|
|
}
|
|
|
|
return 0;
|
|
}
|