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ffmpeg.wasm-core
Commit 1565a9a9 authored by Michael Niedermayer's avatar Michael Niedermayer
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avformat/utils: factor rfps calculation out 

Signed-off-by: 's avatarMichael Niedermayer <michaelni@gmx.at>
parent dc1b0a54
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Showing with 102 additions and 67 deletions
libavformat/internal.h
View file @ 1565a9a9
......@@ -371,4 +371,14 @@ int ff_generate_avci_extradata(AVStream *st);
*/
int ff_alloc_extradata(AVCodecContext *avctx, int size);
/**
* add frame for rfps calculation.
*
* @param dts timestamp of the i-th frame
* @return 0 if OK, AVERROR_xxx on error
*/
int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts);
void ff_rfps_calculate(AVFormatContext *ic);
#endif /* AVFORMAT_INTERNAL_H */
libavformat/utils.c
View file @ 1565a9a9
......@@ -2701,6 +2701,94 @@ int ff_alloc_extradata(AVCodecContext *avctx, int size)
return ret;
}
int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t ts)
{
int i, j;
int64_t last = st->info->last_dts;
if( ts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && ts > last
&& ts - (uint64_t)last < INT64_MAX){
double dts= (is_relative(ts) ? ts - RELATIVE_TS_BASE : ts) * av_q2d(st->time_base);
int64_t duration= ts - last;
if (!st->info->duration_error)
st->info->duration_error = av_mallocz(sizeof(st->info->duration_error[0])*2);
if (!st->info->duration_error)
return AVERROR(ENOMEM);
// if(st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
// av_log(NULL, AV_LOG_ERROR, "%f\n", dts);
for (i=0; i<MAX_STD_TIMEBASES; i++) {
int framerate= get_std_framerate(i);
double sdts= dts*framerate/(1001*12);
for(j=0; j<2; j++){
int64_t ticks= llrint(sdts+j*0.5);
double error= sdts - ticks + j*0.5;
st->info->duration_error[j][0][i] += error;
st->info->duration_error[j][1][i] += error*error;
}
}
st->info->duration_count++;
// ignore the first 4 values, they might have some random jitter
if (st->info->duration_count > 3 && is_relative(ts) == is_relative(last))
st->info->duration_gcd = av_gcd(st->info->duration_gcd, duration);
}
if (ts != AV_NOPTS_VALUE)
st->info->last_dts = ts;
return 0;
}
void ff_rfps_calculate(AVFormatContext *ic)
{
int i, j;
for (i = 0; i<ic->nb_streams; i++) {
AVStream *st = ic->streams[i];
if (st->codec->codec_type != AVMEDIA_TYPE_VIDEO)
continue;
// the check for tb_unreliable() is not completely correct, since this is not about handling
// a unreliable/inexact time base, but a time base that is finer than necessary, as e.g.
// ipmovie.c produces.
if (tb_unreliable(st->codec) && st->info->duration_count > 15 && st->info->duration_gcd > FFMAX(1, st->time_base.den/(500LL*st->time_base.num)) && !st->r_frame_rate.num)
av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, st->time_base.den, st->time_base.num * st->info->duration_gcd, INT_MAX);
if (st->info->duration_count>1 && !st->r_frame_rate.num
&& tb_unreliable(st->codec)) {
int num = 0;
double best_error= 0.01;
for (j=0; j<MAX_STD_TIMEBASES; j++) {
int k;
if(st->info->codec_info_duration && st->info->codec_info_duration*av_q2d(st->time_base) < (1001*12.0)/get_std_framerate(j))
continue;
if(!st->info->codec_info_duration && 1.0 < (1001*12.0)/get_std_framerate(j))
continue;
for(k=0; k<2; k++){
int n= st->info->duration_count;
double a= st->info->duration_error[k][0][j] / n;
double error= st->info->duration_error[k][1][j]/n - a*a;
if(error < best_error && best_error> 0.000000001){
best_error= error;
num = get_std_framerate(j);
}
if(error < 0.02)
av_log(NULL, AV_LOG_DEBUG, "rfps: %f %f\n", get_std_framerate(j) / 12.0/1001, error);
}
}
// do not increase frame rate by more than 1 % in order to match a standard rate.
if (num && (!st->r_frame_rate.num || (double)num/(12*1001) < 1.01 * av_q2d(st->r_frame_rate)))
av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, num, 12*1001, INT_MAX);
}
av_freep(&st->info->duration_error);
st->info->last_dts = AV_NOPTS_VALUE;
st->info->duration_count = 0;
}
}
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
{
int i, count, ret = 0, j;
......@@ -2918,39 +3006,7 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
}
}
#if FF_API_R_FRAME_RATE
{
int64_t last = st->info->last_dts;
if( pkt->dts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && pkt->dts > last
&& pkt->dts - (uint64_t)last < INT64_MAX){
double dts= (is_relative(pkt->dts) ? pkt->dts - RELATIVE_TS_BASE : pkt->dts) * av_q2d(st->time_base);
int64_t duration= pkt->dts - last;
if (!st->info->duration_error)
st->info->duration_error = av_mallocz(sizeof(st->info->duration_error[0])*2);
if (!st->info->duration_error)
return AVERROR(ENOMEM);
// if(st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
// av_log(NULL, AV_LOG_ERROR, "%f\n", dts);
for (i=0; i<MAX_STD_TIMEBASES; i++) {
int framerate= get_std_framerate(i);
double sdts= dts*framerate/(1001*12);
for(j=0; j<2; j++){
int64_t ticks= llrint(sdts+j*0.5);
double error= sdts - ticks + j*0.5;
st->info->duration_error[j][0][i] += error;
st->info->duration_error[j][1][i] += error*error;
}
}
st->info->duration_count++;
// ignore the first 4 values, they might have some random jitter
if (st->info->duration_count > 3 && is_relative(pkt->dts) == is_relative(last))
st->info->duration_gcd = av_gcd(st->info->duration_gcd, duration);
}
if (pkt->dts != AV_NOPTS_VALUE)
st->info->last_dts = pkt->dts;
}
ff_rfps_add_frame(ic, st, pkt->dts);
#endif
if(st->parser && st->parser->parser->split && !st->codec->extradata){
int i= st->parser->parser->split(st->codec, pkt->data, pkt->size);
......@@ -3006,6 +3062,9 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
st = ic->streams[i];
avcodec_close(st->codec);
}
ff_rfps_calculate(ic);
for(i=0;i<ic->nb_streams;i++) {
st = ic->streams[i];
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
......@@ -3044,40 +3103,6 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
best_fps, 12*1001, INT_MAX);
}
}
// the check for tb_unreliable() is not completely correct, since this is not about handling
// a unreliable/inexact time base, but a time base that is finer than necessary, as e.g.
// ipmovie.c produces.
if (tb_unreliable(st->codec) && st->info->duration_count > 15 && st->info->duration_gcd > FFMAX(1, st->time_base.den/(500LL*st->time_base.num)) && !st->r_frame_rate.num)
av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, st->time_base.den, st->time_base.num * st->info->duration_gcd, INT_MAX);
if (st->info->duration_count>1 && !st->r_frame_rate.num
&& tb_unreliable(st->codec)) {
int num = 0;
double best_error= 0.01;
for (j=0; j<MAX_STD_TIMEBASES; j++) {
int k;
if(st->info->codec_info_duration && st->info->codec_info_duration*av_q2d(st->time_base) < (1001*12.0)/get_std_framerate(j))
continue;
if(!st->info->codec_info_duration && 1.0 < (1001*12.0)/get_std_framerate(j))
continue;
for(k=0; k<2; k++){
int n= st->info->duration_count;
double a= st->info->duration_error[k][0][j] / n;
double error= st->info->duration_error[k][1][j]/n - a*a;
if(error < best_error && best_error> 0.000000001){
best_error= error;
num = get_std_framerate(j);
}
if(error < 0.02)
av_log(NULL, AV_LOG_DEBUG, "rfps: %f %f\n", get_std_framerate(j) / 12.0/1001, error);
}
}
// do not increase frame rate by more than 1 % in order to match a standard rate.
if (num && (!st->r_frame_rate.num || (double)num/(12*1001) < 1.01 * av_q2d(st->r_frame_rate)))
av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, num, 12*1001, INT_MAX);
}
if (!st->r_frame_rate.num){
if( st->codec->time_base.den * (int64_t)st->time_base.num
......
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