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FFmpeg/libavformat/avformat.c

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/*
* Various functions used by both muxers and demuxers
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
*
* 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
*/
#include <math.h>
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/frame.h"
#include "libavutil/iamf.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixfmt.h"
#include "libavutil/samplefmt.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/codec.h"
#include "libavcodec/bsf.h"
#include "libavcodec/codec_desc.h"
#include "libavcodec/packet_internal.h"
#include "avformat.h"
#include "avio.h"
#include "demux.h"
#include "mux.h"
#include "internal.h"
void ff_free_stream(AVStream **pst)
{
AVStream *st = *pst;
FFStream *const sti = ffstream(st);
if (!st)
return;
#if FF_API_AVSTREAM_SIDE_DATA
FF_DISABLE_DEPRECATION_WARNINGS
for (int i = 0; i < st->nb_side_data; i++)
av_freep(&st->side_data[i].data);
av_freep(&st->side_data);
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if (st->attached_pic.data)
av_packet_unref(&st->attached_pic);
av_parser_close(sti->parser);
avcodec_free_context(&sti->avctx);
av_bsf_free(&sti->bsfc);
av_freep(&sti->index_entries);
av_freep(&sti->probe_data.buf);
av_bsf_free(&sti->extract_extradata.bsf);
if (sti->info) {
av_freep(&sti->info->duration_error);
av_freep(&sti->info);
}
av_dict_free(&st->metadata);
avcodec_parameters_free(&st->codecpar);
av_freep(&st->priv_data);
av_freep(pst);
}
void ff_free_stream_group(AVStreamGroup **pstg)
{
AVStreamGroup *stg = *pstg;
if (!stg)
return;
av_freep(&stg->streams);
av_dict_free(&stg->metadata);
av_freep(&stg->priv_data);
switch (stg->type) {
case AV_STREAM_GROUP_PARAMS_IAMF_AUDIO_ELEMENT: {
av_iamf_audio_element_free(&stg->params.iamf_audio_element);
break;
}
case AV_STREAM_GROUP_PARAMS_IAMF_MIX_PRESENTATION: {
av_iamf_mix_presentation_free(&stg->params.iamf_mix_presentation);
break;
}
case AV_STREAM_GROUP_PARAMS_TILE_GRID:
av_opt_free(stg->params.tile_grid);
av_freep(&stg->params.tile_grid->offsets);
av_freep(&stg->params.tile_grid);
break;
default:
break;
}
av_freep(pstg);
}
void ff_remove_stream(AVFormatContext *s, AVStream *st)
{
av_assert0(s->nb_streams>0);
av_assert0(s->streams[ s->nb_streams - 1 ] == st);
ff_free_stream(&s->streams[ --s->nb_streams ]);
}
void ff_remove_stream_group(AVFormatContext *s, AVStreamGroup *stg)
{
av_assert0(s->nb_stream_groups > 0);
av_assert0(s->stream_groups[ s->nb_stream_groups - 1 ] == stg);
ff_free_stream_group(&s->stream_groups[ --s->nb_stream_groups ]);
}
/* XXX: suppress the packet queue */
void ff_flush_packet_queue(AVFormatContext *s)
{
FFFormatContext *const si = ffformatcontext(s);
avpriv_packet_list_free(&si->parse_queue);
avpriv_packet_list_free(&si->packet_buffer);
avpriv_packet_list_free(&si->raw_packet_buffer);
si->raw_packet_buffer_size = 0;
}
void avformat_free_context(AVFormatContext *s)
{
FFFormatContext *si;
if (!s)
return;
si = ffformatcontext(s);
if (s->oformat && ffofmt(s->oformat)->deinit && si->initialized)
ffofmt(s->oformat)->deinit(s);
av_opt_free(s);
if (s->iformat && s->iformat->priv_class && s->priv_data)
av_opt_free(s->priv_data);
if (s->oformat && s->oformat->priv_class && s->priv_data)
av_opt_free(s->priv_data);
for (unsigned i = 0; i < s->nb_streams; i++)
ff_free_stream(&s->streams[i]);
for (unsigned i = 0; i < s->nb_stream_groups; i++)
ff_free_stream_group(&s->stream_groups[i]);
s->nb_stream_groups = 0;
s->nb_streams = 0;
for (unsigned i = 0; i < s->nb_programs; i++) {
av_dict_free(&s->programs[i]->metadata);
av_freep(&s->programs[i]->stream_index);
av_freep(&s->programs[i]);
}
s->nb_programs = 0;
av_freep(&s->programs);
av_freep(&s->priv_data);
while (s->nb_chapters--) {
av_dict_free(&s->chapters[s->nb_chapters]->metadata);
av_freep(&s->chapters[s->nb_chapters]);
}
av_freep(&s->chapters);
av_dict_free(&s->metadata);
av_dict_free(&si->id3v2_meta);
av_packet_free(&si->pkt);
av_packet_free(&si->parse_pkt);
av_freep(&s->streams);
av_freep(&s->stream_groups);
ff_flush_packet_queue(s);
av_freep(&s->url);
av_free(s);
}
#if FF_API_AVSTREAM_SIDE_DATA
FF_DISABLE_DEPRECATION_WARNINGS
uint8_t *av_stream_get_side_data(const AVStream *st,
enum AVPacketSideDataType type, size_t *size)
{
for (int i = 0; i < st->nb_side_data; i++) {
if (st->side_data[i].type == type) {
if (size)
*size = st->side_data[i].size;
return st->side_data[i].data;
}
}
if (size)
*size = 0;
return NULL;
}
int av_stream_add_side_data(AVStream *st, enum AVPacketSideDataType type,
uint8_t *data, size_t size)
{
AVPacketSideData *sd, *tmp;
for (int i = 0; i < st->nb_side_data; i++) {
sd = &st->side_data[i];
if (sd->type == type) {
av_freep(&sd->data);
sd->data = data;
sd->size = size;
return 0;
}
}
if (st->nb_side_data + 1U > FFMIN(INT_MAX, SIZE_MAX / sizeof(*tmp)))
return AVERROR(ERANGE);
tmp = av_realloc_array(st->side_data, st->nb_side_data + 1, sizeof(*tmp));
if (!tmp) {
return AVERROR(ENOMEM);
}
st->side_data = tmp;
st->nb_side_data++;
sd = &st->side_data[st->nb_side_data - 1];
sd->type = type;
sd->data = data;
sd->size = size;
return 0;
}
uint8_t *av_stream_new_side_data(AVStream *st, enum AVPacketSideDataType type,
size_t size)
{
int ret;
uint8_t *data = av_malloc(size);
if (!data)
return NULL;
ret = av_stream_add_side_data(st, type, data, size);
if (ret < 0) {
av_freep(&data);
return NULL;
}
return data;
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif
/**
* Copy all stream parameters from source to destination stream, with the
* exception of the index field, which is usually set by avformat_new_stream().
*
* @param dst pointer to destination AVStream
* @param src pointer to source AVStream
* @return >=0 on success, AVERROR code on error
*/
static int stream_params_copy(AVStream *dst, const AVStream *src)
{
int ret;
dst->id = src->id;
dst->time_base = src->time_base;
dst->start_time = src->start_time;
dst->duration = src->duration;
dst->nb_frames = src->nb_frames;
dst->disposition = src->disposition;
dst->discard = src->discard;
dst->sample_aspect_ratio = src->sample_aspect_ratio;
dst->avg_frame_rate = src->avg_frame_rate;
dst->event_flags = src->event_flags;
dst->r_frame_rate = src->r_frame_rate;
dst->pts_wrap_bits = src->pts_wrap_bits;
av_dict_free(&dst->metadata);
ret = av_dict_copy(&dst->metadata, src->metadata, 0);
if (ret < 0)
return ret;
ret = avcodec_parameters_copy(dst->codecpar, src->codecpar);
if (ret < 0)
return ret;
av_packet_unref(&dst->attached_pic);
if (src->attached_pic.data) {
ret = av_packet_ref(&dst->attached_pic, &src->attached_pic);
if (ret < 0)
return ret;
}
return 0;
}
AVStream *ff_stream_clone(AVFormatContext *dst_ctx, const AVStream *src)
{
AVStream *st;
int ret;
st = avformat_new_stream(dst_ctx, NULL);
if (!st)
return NULL;
ret = stream_params_copy(st, src);
if (ret < 0) {
ff_remove_stream(dst_ctx, st);
return NULL;
}
return st;
}
const char *avformat_stream_group_name(enum AVStreamGroupParamsType type)
{
switch(type) {
case AV_STREAM_GROUP_PARAMS_IAMF_AUDIO_ELEMENT: return "IAMF Audio Element";
case AV_STREAM_GROUP_PARAMS_IAMF_MIX_PRESENTATION: return "IAMF Mix Presentation";
case AV_STREAM_GROUP_PARAMS_TILE_GRID: return "Tile Grid";
}
return NULL;
}
AVProgram *av_new_program(AVFormatContext *ac, int id)
{
AVProgram *program = NULL;
int ret;
av_log(ac, AV_LOG_TRACE, "new_program: id=0x%04x\n", id);
for (unsigned i = 0; i < ac->nb_programs; i++)
if (ac->programs[i]->id == id)
program = ac->programs[i];
if (!program) {
program = av_mallocz(sizeof(*program));
if (!program)
return NULL;
ret = av_dynarray_add_nofree(&ac->programs, &ac->nb_programs, program);
if (ret < 0) {
av_free(program);
return NULL;
}
program->discard = AVDISCARD_NONE;
program->pmt_version = -1;
program->id = id;
program->pts_wrap_reference = AV_NOPTS_VALUE;
program->pts_wrap_behavior = AV_PTS_WRAP_IGNORE;
program->start_time =
program->end_time = AV_NOPTS_VALUE;
}
return program;
}
void av_program_add_stream_index(AVFormatContext *ac, int progid, unsigned idx)
{
AVProgram *program = NULL;
void *tmp;
if (idx >= ac->nb_streams) {
av_log(ac, AV_LOG_ERROR, "stream index %d is not valid\n", idx);
return;
}
for (unsigned i = 0; i < ac->nb_programs; i++) {
if (ac->programs[i]->id != progid)
continue;
program = ac->programs[i];
for (unsigned j = 0; j < program->nb_stream_indexes; j++)
if (program->stream_index[j] == idx)
return;
tmp = av_realloc_array(program->stream_index, program->nb_stream_indexes+1, sizeof(unsigned int));
if (!tmp)
return;
program->stream_index = tmp;
program->stream_index[program->nb_stream_indexes++] = idx;
return;
}
}
AVProgram *av_find_program_from_stream(AVFormatContext *ic, AVProgram *last, int s)
{
for (unsigned i = 0; i < ic->nb_programs; i++) {
if (ic->programs[i] == last) {
last = NULL;
} else {
if (!last)
for (unsigned j = 0; j < ic->programs[i]->nb_stream_indexes; j++)
if (ic->programs[i]->stream_index[j] == s)
return ic->programs[i];
}
}
return NULL;
}
int av_find_default_stream_index(AVFormatContext *s)
{
int best_stream = 0;
int best_score = INT_MIN;
if (s->nb_streams <= 0)
return -1;
for (unsigned i = 0; i < s->nb_streams; i++) {
const AVStream *const st = s->streams[i];
const FFStream *const sti = cffstream(st);
int score = 0;
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
if (st->disposition & AV_DISPOSITION_ATTACHED_PIC)
score -= 400;
if (st->codecpar->width && st->codecpar->height)
score += 50;
score+= 25;
}
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
if (st->codecpar->sample_rate)
score += 50;
}
if (sti->codec_info_nb_frames)
score += 12;
if (st->discard != AVDISCARD_ALL)
score += 200;
if (score > best_score) {
best_score = score;
best_stream = i;
}
}
return best_stream;
}
int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type,
int wanted_stream_nb, int related_stream,
const AVCodec **decoder_ret, int flags)
{
int nb_streams = ic->nb_streams;
int ret = AVERROR_STREAM_NOT_FOUND;
int best_count = -1, best_multiframe = -1, best_disposition = -1;
int count, multiframe, disposition;
int64_t best_bitrate = -1;
int64_t bitrate;
unsigned *program = NULL;
const AVCodec *decoder = NULL, *best_decoder = NULL;
if (related_stream >= 0 && wanted_stream_nb < 0) {
AVProgram *p = av_find_program_from_stream(ic, NULL, related_stream);
if (p) {
program = p->stream_index;
nb_streams = p->nb_stream_indexes;
}
}
for (unsigned i = 0; i < nb_streams; i++) {
int real_stream_index = program ? program[i] : i;
AVStream *st = ic->streams[real_stream_index];
AVCodecParameters *par = st->codecpar;
if (par->codec_type != type)
continue;
if (wanted_stream_nb >= 0 && real_stream_index != wanted_stream_nb)
continue;
if (type == AVMEDIA_TYPE_AUDIO && !(par->ch_layout.nb_channels && par->sample_rate))
continue;
if (decoder_ret) {
decoder = ff_find_decoder(ic, st, par->codec_id);
if (!decoder) {
if (ret < 0)
ret = AVERROR_DECODER_NOT_FOUND;
continue;
}
}
disposition = !(st->disposition & (AV_DISPOSITION_HEARING_IMPAIRED | AV_DISPOSITION_VISUAL_IMPAIRED))
+ !! (st->disposition & AV_DISPOSITION_DEFAULT);
count = ffstream(st)->codec_info_nb_frames;
bitrate = par->bit_rate;
multiframe = FFMIN(5, count);
if ((best_disposition > disposition) ||
(best_disposition == disposition && best_multiframe > multiframe) ||
(best_disposition == disposition && best_multiframe == multiframe && best_bitrate > bitrate) ||
(best_disposition == disposition && best_multiframe == multiframe && best_bitrate == bitrate && best_count >= count))
continue;
best_disposition = disposition;
best_count = count;
best_bitrate = bitrate;
best_multiframe = multiframe;
ret = real_stream_index;
best_decoder = decoder;
if (program && i == nb_streams - 1 && ret < 0) {
program = NULL;
nb_streams = ic->nb_streams;
/* no related stream found, try again with everything */
i = 0;
}
}
if (decoder_ret)
*decoder_ret = best_decoder;
return ret;
}
/**
* Matches a stream specifier (but ignores requested index).
*
* @param indexptr set to point to the requested stream index if there is one
*
* @return <0 on error
* 0 if st is NOT a matching stream
* >0 if st is a matching stream
*/
static int match_stream_specifier(const AVFormatContext *s, const AVStream *st,
const char *spec, const char **indexptr,
const AVStreamGroup **g, const AVProgram **p)
{
int match = 1; /* Stores if the specifier matches so far. */
while (*spec) {
if (*spec <= '9' && *spec >= '0') { /* opt:index */
if (indexptr)
*indexptr = spec;
return match;
} else if (*spec == 'v' || *spec == 'a' || *spec == 's' || *spec == 'd' ||
*spec == 't' || *spec == 'V') { /* opt:[vasdtV] */
enum AVMediaType type;
int nopic = 0;
switch (*spec++) {
case 'v': type = AVMEDIA_TYPE_VIDEO; break;
case 'a': type = AVMEDIA_TYPE_AUDIO; break;
case 's': type = AVMEDIA_TYPE_SUBTITLE; break;
case 'd': type = AVMEDIA_TYPE_DATA; break;
case 't': type = AVMEDIA_TYPE_ATTACHMENT; break;
case 'V': type = AVMEDIA_TYPE_VIDEO; nopic = 1; break;
default: av_assert0(0);
}
if (*spec && *spec++ != ':') /* If we are not at the end, then another specifier must follow. */
return AVERROR(EINVAL);
if (type != st->codecpar->codec_type)
match = 0;
if (nopic && (st->disposition & AV_DISPOSITION_ATTACHED_PIC))
match = 0;
} else if (*spec == 'g' && *(spec + 1) == ':') {
int64_t group_idx = -1, group_id = -1;
int found = 0;
char *endptr;
spec += 2;
if (*spec == '#' || (*spec == 'i' && *(spec + 1) == ':')) {
spec += 1 + (*spec == 'i');
group_id = strtol(spec, &endptr, 0);
if (spec == endptr || (*endptr && *endptr++ != ':'))
return AVERROR(EINVAL);
spec = endptr;
} else {
group_idx = strtol(spec, &endptr, 0);
/* Disallow empty id and make sure that if we are not at the end, then another specifier must follow. */
if (spec == endptr || (*endptr && *endptr++ != ':'))
return AVERROR(EINVAL);
spec = endptr;
}
if (match) {
if (group_id > 0) {
for (unsigned i = 0; i < s->nb_stream_groups; i++) {
if (group_id == s->stream_groups[i]->id) {
group_idx = i;
break;
}
}
}
if (group_idx < 0 || group_idx >= s->nb_stream_groups)
return AVERROR(EINVAL);
for (unsigned j = 0; j < s->stream_groups[group_idx]->nb_streams; j++) {
if (st->index == s->stream_groups[group_idx]->streams[j]->index) {
found = 1;
if (g)
*g = s->stream_groups[group_idx];
break;
}
}
}
if (!found)
match = 0;
} else if (*spec == 'p' && *(spec + 1) == ':') {
int prog_id;
int found = 0;
char *endptr;
spec += 2;
prog_id = strtol(spec, &endptr, 0);
/* Disallow empty id and make sure that if we are not at the end, then another specifier must follow. */
if (spec == endptr || (*endptr && *endptr++ != ':'))
return AVERROR(EINVAL);
spec = endptr;
if (match) {
for (unsigned i = 0; i < s->nb_programs; i++) {
if (s->programs[i]->id != prog_id)
continue;
for (unsigned j = 0; j < s->programs[i]->nb_stream_indexes; j++) {
if (st->index == s->programs[i]->stream_index[j]) {
found = 1;
if (p)
*p = s->programs[i];
i = s->nb_programs;
break;
}
}
}
}
if (!found)
match = 0;
} else if (*spec == '#' ||
(*spec == 'i' && *(spec + 1) == ':')) {
int stream_id;
char *endptr;
spec += 1 + (*spec == 'i');
stream_id = strtol(spec, &endptr, 0);
if (spec == endptr || *endptr) /* Disallow empty id and make sure we are at the end. */
return AVERROR(EINVAL);
return match && (stream_id == st->id);
} else if (*spec == 'm' && *(spec + 1) == ':') {
const AVDictionaryEntry *tag;
char *key, *val;
int ret;
if (match) {
spec += 2;
val = strchr(spec, ':');
key = val ? av_strndup(spec, val - spec) : av_strdup(spec);
if (!key)
return AVERROR(ENOMEM);
tag = av_dict_get(st->metadata, key, NULL, 0);
if (tag) {
if (!val || !strcmp(tag->value, val + 1))
ret = 1;
else
ret = 0;
} else
ret = 0;
av_freep(&key);
}
return match && ret;
} else if (*spec == 'u' && *(spec + 1) == '\0') {
const AVCodecParameters *par = st->codecpar;
int val;
switch (par->codec_type) {
case AVMEDIA_TYPE_AUDIO:
val = par->sample_rate && par->ch_layout.nb_channels;
if (par->format == AV_SAMPLE_FMT_NONE)
return 0;
break;
case AVMEDIA_TYPE_VIDEO:
val = par->width && par->height;
if (par->format == AV_PIX_FMT_NONE)
return 0;
break;
case AVMEDIA_TYPE_UNKNOWN:
val = 0;
break;
default:
val = 1;
break;
}
return match && (par->codec_id != AV_CODEC_ID_NONE && val != 0);
} else {
return AVERROR(EINVAL);
}
}
return match;
}
int avformat_match_stream_specifier(AVFormatContext *s, AVStream *st,
const char *spec)
{
int ret, index;
char *endptr;
const char *indexptr = NULL;
const AVStreamGroup *g = NULL;
const AVProgram *p = NULL;
int nb_streams;
ret = match_stream_specifier(s, st, spec, &indexptr, &g, &p);
if (ret < 0)
goto error;
if (!indexptr)
return ret;
index = strtol(indexptr, &endptr, 0);
if (*endptr) { /* We can't have anything after the requested index. */
ret = AVERROR(EINVAL);
goto error;
}
/* This is not really needed but saves us a loop for simple stream index specifiers. */
if (spec == indexptr)
return (index == st->index);
/* If we requested a matching stream index, we have to ensure st is that. */
nb_streams = g ? g->nb_streams : (p ? p->nb_stream_indexes : s->nb_streams);
for (int i = 0; i < nb_streams && index >= 0; i++) {
unsigned idx = g ? g->streams[i]->index : (p ? p->stream_index[i] : i);
const AVStream *candidate = s->streams[idx];
ret = match_stream_specifier(s, candidate, spec, NULL, NULL, NULL);
if (ret < 0)
goto error;
if (ret > 0 && index-- == 0 && st == candidate)
return 1;
}
return 0;
error:
if (ret == AVERROR(EINVAL))
av_log(s, AV_LOG_ERROR, "Invalid stream specifier: %s.\n", spec);
return ret;
}
AVRational av_guess_sample_aspect_ratio(AVFormatContext *format, AVStream *stream, AVFrame *frame)
{
AVRational undef = {0, 1};
AVRational stream_sample_aspect_ratio = stream ? stream->sample_aspect_ratio : undef;
AVRational codec_sample_aspect_ratio = stream && stream->codecpar ? stream->codecpar->sample_aspect_ratio : undef;
AVRational frame_sample_aspect_ratio = frame ? frame->sample_aspect_ratio : codec_sample_aspect_ratio;
av_reduce(&stream_sample_aspect_ratio.num, &stream_sample_aspect_ratio.den,
stream_sample_aspect_ratio.num, stream_sample_aspect_ratio.den, INT_MAX);
if (stream_sample_aspect_ratio.num <= 0 || stream_sample_aspect_ratio.den <= 0)
stream_sample_aspect_ratio = undef;
av_reduce(&frame_sample_aspect_ratio.num, &frame_sample_aspect_ratio.den,
frame_sample_aspect_ratio.num, frame_sample_aspect_ratio.den, INT_MAX);
if (frame_sample_aspect_ratio.num <= 0 || frame_sample_aspect_ratio.den <= 0)
frame_sample_aspect_ratio = undef;
if (stream_sample_aspect_ratio.num)
return stream_sample_aspect_ratio;
else
return frame_sample_aspect_ratio;
}
AVRational av_guess_frame_rate(AVFormatContext *format, AVStream *st, AVFrame *frame)
{
AVRational fr = st->r_frame_rate;
const AVCodecDescriptor *desc = cffstream(st)->codec_desc;
AVRational avg_fr = st->avg_frame_rate;
if (avg_fr.num > 0 && avg_fr.den > 0 && fr.num > 0 && fr.den > 0 &&
av_q2d(avg_fr) < 70 && av_q2d(fr) > 210) {
fr = avg_fr;
}
if (desc && (desc->props & AV_CODEC_PROP_FIELDS)) {
const AVCodecContext *const avctx = ffstream(st)->avctx;
AVRational codec_fr = avctx->framerate;
if ( codec_fr.num > 0 && codec_fr.den > 0 &&
(fr.num == 0 || av_q2d(codec_fr) < av_q2d(fr)*0.7 && fabs(1.0 - av_q2d(av_div_q(avg_fr, fr))) > 0.1))
fr = codec_fr;
}
return fr;
}
int avformat_transfer_internal_stream_timing_info(const AVOutputFormat *ofmt,
AVStream *ost, const AVStream *ist,
enum AVTimebaseSource copy_tb)
{
const AVCodecDescriptor *desc = cffstream(ist)->codec_desc;
const AVCodecContext *const dec_ctx = cffstream(ist)->avctx;
AVRational mul = (AVRational){ desc && (desc->props & AV_CODEC_PROP_FIELDS) ? 2 : 1, 1 };
AVRational dec_ctx_framerate = dec_ctx ? dec_ctx->framerate : (AVRational){ 0, 0 };
AVRational dec_ctx_tb = dec_ctx_framerate.num ? av_inv_q(av_mul_q(dec_ctx_framerate, mul))
: (ist->codecpar->codec_type == AVMEDIA_TYPE_AUDIO ? (AVRational){0, 1}
: ist->time_base);
AVRational enc_tb = ist->time_base;
#if FF_API_TICKS_PER_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
int ticks_per_frame = dec_ctx ? dec_ctx->ticks_per_frame : 1;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
/*
* Avi is a special case here because it supports variable fps but
* having the fps and timebase differe significantly adds quite some
* overhead
*/
if (!strcmp(ofmt->name, "avi")) {
#if FF_API_R_FRAME_RATE
if (copy_tb == AVFMT_TBCF_AUTO && ist->r_frame_rate.num
&& av_q2d(ist->r_frame_rate) >= av_q2d(ist->avg_frame_rate)
&& 0.5/av_q2d(ist->r_frame_rate) > av_q2d(ist->time_base)
&& 0.5/av_q2d(ist->r_frame_rate) > av_q2d(dec_ctx_tb)
&& av_q2d(ist->time_base) < 1.0/500 && av_q2d(dec_ctx_tb) < 1.0/500
|| copy_tb == AVFMT_TBCF_R_FRAMERATE) {
enc_tb.num = ist->r_frame_rate.den;
enc_tb.den = 2*ist->r_frame_rate.num;
} else
#endif
if (copy_tb == AVFMT_TBCF_AUTO && dec_ctx_framerate.num &&
av_q2d(av_inv_q(dec_ctx_framerate)) > 2*av_q2d(ist->time_base)
&& av_q2d(ist->time_base) < 1.0/500
|| (copy_tb == AVFMT_TBCF_DECODER &&
(dec_ctx_framerate.num || ist->codecpar->codec_type == AVMEDIA_TYPE_AUDIO))) {
enc_tb = dec_ctx_tb;
enc_tb.den *= 2;
#if FF_API_TICKS_PER_FRAME
enc_tb.num *= ticks_per_frame;
#endif
}
} else if (!(ofmt->flags & AVFMT_VARIABLE_FPS)
&& !av_match_name(ofmt->name, "mov,mp4,3gp,3g2,psp,ipod,ismv,f4v")) {
if (copy_tb == AVFMT_TBCF_AUTO && dec_ctx_framerate.num
&& av_q2d(av_inv_q(dec_ctx_framerate)) > av_q2d(ist->time_base)
&& av_q2d(ist->time_base) < 1.0/500
|| (copy_tb == AVFMT_TBCF_DECODER &&
(dec_ctx_framerate.num || ist->codecpar->codec_type == AVMEDIA_TYPE_AUDIO))) {
enc_tb = dec_ctx_tb;
#if FF_API_TICKS_PER_FRAME
enc_tb.num *= ticks_per_frame;
#endif
}
}
if (ost->codecpar->codec_tag == AV_RL32("tmcd")
&& dec_ctx_tb.num < dec_ctx_tb.den
&& dec_ctx_tb.num > 0
&& 121LL*dec_ctx_tb.num > dec_ctx_tb.den) {
enc_tb = dec_ctx_tb;
}
av_reduce(&ffstream(ost)->transferred_mux_tb.num,
&ffstream(ost)->transferred_mux_tb.den,
enc_tb.num, enc_tb.den, INT_MAX);
return 0;
}
AVRational av_stream_get_codec_timebase(const AVStream *st)
{
return cffstream(st)->avctx ? cffstream(st)->avctx->time_base : cffstream(st)->transferred_mux_tb;
}
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits,
unsigned int pts_num, unsigned int pts_den)
{
FFStream *const sti = ffstream(st);
AVRational new_tb;
if (av_reduce(&new_tb.num, &new_tb.den, pts_num, pts_den, INT_MAX)) {
if (new_tb.num != pts_num)
av_log(NULL, AV_LOG_DEBUG,
"st:%d removing common factor %d from timebase\n",
st->index, pts_num / new_tb.num);
} else
av_log(NULL, AV_LOG_WARNING,
"st:%d has too large timebase, reducing\n", st->index);
if (new_tb.num <= 0 || new_tb.den <= 0) {
av_log(NULL, AV_LOG_ERROR,
"Ignoring attempt to set invalid timebase %d/%d for st:%d\n",
new_tb.num, new_tb.den,
st->index);
return;
}
st->time_base = new_tb;
if (sti->avctx)
sti->avctx->pkt_timebase = new_tb;
st->pts_wrap_bits = pts_wrap_bits;
}
const AVCodec *ff_find_decoder(AVFormatContext *s, const AVStream *st,
enum AVCodecID codec_id)
{
switch (st->codecpar->codec_type) {
case AVMEDIA_TYPE_VIDEO:
if (s->video_codec) return s->video_codec;
break;
case AVMEDIA_TYPE_AUDIO:
if (s->audio_codec) return s->audio_codec;
break;
case AVMEDIA_TYPE_SUBTITLE:
if (s->subtitle_codec) return s->subtitle_codec;
break;
}
return avcodec_find_decoder(codec_id);
}
int ff_copy_whiteblacklists(AVFormatContext *dst, const AVFormatContext *src)
{
#define OFF(field) offsetof(AVFormatContext, field)
static const unsigned offsets[] = {
OFF(codec_whitelist), OFF(format_whitelist),
OFF(protocol_whitelist), OFF(protocol_blacklist),
};
#undef OFF
av_assert0(!dst->codec_whitelist &&
!dst->format_whitelist &&
!dst->protocol_whitelist &&
!dst->protocol_blacklist);
for (unsigned i = 0; i < FF_ARRAY_ELEMS(offsets); i++) {
const char *src_str = *(char *const*)((const char*)src + offsets[i]);
if (src_str) {
char *dst_str = av_strdup(src_str);
if (!dst_str) {
av_log(dst, AV_LOG_ERROR, "Failed to duplicate black/whitelist\n");
return AVERROR(ENOMEM);
}
*(char **)((char*)dst + offsets[i]) = dst_str;
}
}
return 0;
}
int ff_is_intra_only(enum AVCodecID id)
{
const AVCodecDescriptor *d = avcodec_descriptor_get(id);
if (!d)
return 0;
if ((d->type == AVMEDIA_TYPE_VIDEO || d->type == AVMEDIA_TYPE_AUDIO) &&
!(d->props & AV_CODEC_PROP_INTRA_ONLY))
return 0;
return 1;
}
void ff_format_set_url(AVFormatContext *s, char *url)
{
av_assert0(url);
av_freep(&s->url);
s->url = url;
}
int ff_format_io_close(AVFormatContext *s, AVIOContext **pb)
{
int ret = 0;
if (*pb)
ret = s->io_close2(s, *pb);
*pb = NULL;
return ret;
}