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ffmpeg.wasm-core
Commit 6dc96cb0 authored by Juanjo's avatar Juanjo
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- Now ffmpeg handles MPEG-2 streams with pull down, it gets the real frame 

rate of the stream.

Originally committed as revision 498 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent 76c0441b
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Showing with 179 additions and 15 deletions
ffmpeg.c
View file @ 6dc96cb0
......@@ -18,6 +18,7 @@
*/
#define HAVE_AV_CONFIG_H
#include "avformat.h"
#include "tick.h"
#ifndef CONFIG_WIN32
#include <unistd.h>
......@@ -138,6 +139,8 @@ typedef struct AVInputStream {
AVStream *st;
int discard; /* true if stream data should be discarded */
int decoding_needed; /* true if the packets must be decoded in 'raw_fifo' */
Ticker pts_ticker; /* Ticker for PTS calculation */
int ticker_inited; /* to signal if the ticker was initialized */
INT64 pts; /* current pts */
int pts_increment; /* expected pts increment for next packet */
int frame_number; /* current frame */
......@@ -404,7 +407,7 @@ static void do_video_out(AVFormatContext *s,
AVPicture *picture1,
int *frame_size)
{
int n1, n2, nb, i, ret, frame_number;
int n1, n2, nb, i, ret, frame_number, dec_frame_rate;
AVPicture *picture, *picture2, *pict;
AVPicture picture_tmp1, picture_tmp2;
UINT8 video_buffer[1024*1024];
......@@ -415,9 +418,11 @@ static void do_video_out(AVFormatContext *s,
dec = &ist->st->codec;
frame_number = ist->frame_number;
dec_frame_rate = ist->st->r_frame_rate;
//fprintf(stderr, "\n%d", dec_frame_rate);
/* first drop frame if needed */
n1 = ((INT64)frame_number * enc->frame_rate) / dec->frame_rate;
n2 = (((INT64)frame_number + 1) * enc->frame_rate) / dec->frame_rate;
n1 = ((INT64)frame_number * enc->frame_rate) / dec_frame_rate;
n2 = (((INT64)frame_number + 1) * enc->frame_rate) / dec_frame_rate;
nb = n2 - n1;
if (nb <= 0)
return;
......@@ -477,7 +482,7 @@ static void do_video_out(AVFormatContext *s,
} else {
picture = pict;
}
nb=1;
/* duplicates frame if needed */
/* XXX: pb because no interleaving */
for(i=0;i<nb;i++) {
......@@ -487,6 +492,7 @@ static void do_video_out(AVFormatContext *s,
if (same_quality) {
enc->quality = dec->quality;
}
ret = avcodec_encode_video(enc,
video_buffer, sizeof(video_buffer),
picture);
......@@ -756,7 +762,16 @@ static int av_encode(AVFormatContext **output_files,
icodec->codec_id == CODEC_ID_AC3) {
/* Special case for 5:1 AC3 input */
/* and mono or stereo output */
ost->audio_resample = 0;
/* Request specific number of channels */
icodec->channels = codec->channels;
if (codec->sample_rate == icodec->sample_rate)
ost->audio_resample = 0;
else {
ost->audio_resample = 1;
ost->resample = audio_resample_init(codec->channels, icodec->channels,
codec->sample_rate,
icodec->sample_rate);
}
/* Request specific number of channels */
icodec->channels = codec->channels;
} else {
......@@ -844,8 +859,8 @@ static int av_encode(AVFormatContext **output_files,
ist->file_index, ist->index);
exit(1);
}
if (ist->st->codec.codec_type == CODEC_TYPE_VIDEO)
ist->st->codec.repeat_pict = 1;
//if (ist->st->codec.codec_type == CODEC_TYPE_VIDEO)
// ist->st->codec.flags |= CODEC_FLAG_REPEAT_FIELD;
}
}
......@@ -1006,6 +1021,7 @@ static int av_encode(AVFormatContext **output_files,
len -= ret;
continue;
}
}
break;
default:
......@@ -1016,17 +1032,38 @@ static int av_encode(AVFormatContext **output_files,
data_size = len;
ret = len;
}
/* init tickers */
if (!ist->ticker_inited) {
switch (ist->st->codec.codec_type) {
case CODEC_TYPE_AUDIO:
ticker_init(&ist->pts_ticker,
(INT64)ist->st->codec.sample_rate,
(INT64)(1000000));
ist->ticker_inited = 1;
break;
case CODEC_TYPE_VIDEO:
ticker_init(&ist->pts_ticker,
(INT64)ist->st->r_frame_rate,
((INT64)1000000 * FRAME_RATE_BASE));
ist->ticker_inited = 1;
break;
default:
abort();
}
}
/* update pts */
switch(ist->st->codec.codec_type) {
case CODEC_TYPE_AUDIO:
ist->pts = (INT64)1000000 * ist->sample_index / ist->st->codec.sample_rate;
//ist->pts = (INT64)1000000 * ist->sample_index / ist->st->codec.sample_rate;
ist->pts = ticker_tick(&ist->pts_ticker, ist->sample_index);
ist->sample_index += data_size / (2 * ist->st->codec.channels);
ist->pts_increment = (INT64) (data_size / (2 * ist->st->codec.channels)) * 1000000 / ist->st->codec.sample_rate;
break;
case CODEC_TYPE_VIDEO:
ist->frame_number++;
ist->pts = ((INT64)ist->frame_number * 1000000 * FRAME_RATE_BASE) /
ist->st->codec.frame_rate;
//ist->pts = ((INT64)ist->frame_number * 1000000 * FRAME_RATE_BASE) /
// ist->st->codec.frame_rate;
ist->pts = ticker_tick(&ist->pts_ticker, ist->frame_number);
ist->pts_increment = ((INT64) 1000000 * FRAME_RATE_BASE) /
ist->st->codec.frame_rate;
break;
......@@ -1493,7 +1530,7 @@ int find_codec_parameters(AVFormatContext *ic)
AVStream *st;
AVPacket *pkt;
AVPicture picture;
AVPacketList *pktl, **ppktl;
AVPacketList *pktl=NULL, **ppktl;
short samples[AVCODEC_MAX_AUDIO_FRAME_SIZE / 2];
UINT8 *ptr;
......@@ -1554,7 +1591,7 @@ int find_codec_parameters(AVFormatContext *ic)
break;
}
st = ic->streams[pkt->stream_index];
/* decode the data and update codec parameters */
ptr = pkt->data;
size = pkt->size;
......@@ -1562,6 +1599,10 @@ int find_codec_parameters(AVFormatContext *ic)
switch(st->codec.codec_type) {
case CODEC_TYPE_VIDEO:
ret = avcodec_decode_video(&st->codec, &picture, &got_picture, ptr, size);
if (st->codec.codec_id == CODEC_ID_MPEG1VIDEO) {
//mpegvid = pkt->stream_index;
//fps = st->codec.frame_rate;
}
break;
case CODEC_TYPE_AUDIO:
ret = avcodec_decode_audio(&st->codec, samples, &got_picture, ptr, size);
......@@ -1583,7 +1624,7 @@ int find_codec_parameters(AVFormatContext *ic)
count++;
}
the_end:
if (count > 0) {
if (count > 0) {
/* close each codec */
for(i=0;i<ic->nb_streams;i++) {
st = ic->streams[i];
......@@ -1593,6 +1634,118 @@ int find_codec_parameters(AVFormatContext *ic)
return ret;
}
/* Returns the real frame rate of telecine streams */
int get_real_fps(AVFormatContext *ic, AVFormat *fmt, AVFormatParameters *ap, int stream_id)
{
int frame_num, r_frames, fps, rfps;
int ret, got_picture, size;
UINT8 *ptr;
AVStream *st;
AVPacket *pkt;
AVPicture picture;
AVPacketList *pktl=NULL, **ppktl=NULL;
AVCodec *codec;
AVFormatContext *fc;
frame_num = 0;
r_frames = 0;
fps = rfps = -1;
if (stream_id < 0 || stream_id >= ic->nb_streams)
return -1;
/* We must use another AVFormatContext, and open the
file again, since we do not have good seeking */
fc = av_mallocz(sizeof(AVFormatContext));
if (!fc)
goto the_end;
strcpy(fc->filename, ic->filename);
/* open file */
if (!(fmt->flags & AVFMT_NOFILE)) {
if (url_fopen(&fc->pb, fc->filename, URL_RDONLY) < 0) {
fprintf(stderr, "Could not open '%s'\n", fc->filename);
exit(1);
}
}
/* check format */
if (!fmt) {
goto the_end;
}
fc->format = fmt;
/* Read header */
ret = fc->format->read_header(fc, ap);
if (ret < 0) {
fprintf(stderr, "%s: Error while parsing header\n", fc->filename);
goto the_end;
}
/* Find and open codec */
st = fc->streams[stream_id];
codec = avcodec_find_decoder(st->codec.codec_id);
if (codec == NULL) {
goto the_end;
}
ret = avcodec_open(&st->codec, codec);
if (ret < 0)
goto the_end;
ppktl = &fc->packet_buffer;
if (stream_id > -1) {
/* check telecine MPEG video streams, we */
/* decode 40 frames to get the real fps */
while(1) {
pktl = av_mallocz(sizeof(AVPacketList));
if (!pktl) {
goto the_end;
break;
}
/* add the packet in the buffered packet list */
*ppktl = pktl;
ppktl = &pktl->next;
pkt = &pktl->pkt;
if (fc->format->read_packet(fc, pkt) < 0) {
goto the_end;
break;
}
st = fc->streams[pkt->stream_index];
/* decode the video */
ptr = pkt->data;
size = pkt->size;
while (size > 0) {
if (pkt->stream_index == stream_id) {
ret = avcodec_decode_video(&st->codec, &picture, &got_picture, ptr, size);
fps = st->codec.frame_rate;
if (ret < 0) {
goto the_end;
}
if (got_picture) {
frame_num++;
r_frames += st->codec.repeat_pict;
}
}
ptr += ret;
size -= ret;
}
if (frame_num > 39)
break;
}
rfps = (fps * frame_num) / (frame_num + (r_frames >> 1));
/* close codec */
avcodec_close(&st->codec);
}
the_end:
/* FIXME: leak in packet_buffer */
if (fc)
free(fc);
return rfps;
}
int filename_number_test(const char *filename)
{
char buf[1024];
......@@ -1615,7 +1768,7 @@ void opt_input_file(const char *filename)
AVFormatParameters params, *ap = &params;
URLFormat url_format;
AVFormat *fmt;
int err, i, ret;
int err, i, ret, rfps;
ic = av_mallocz(sizeof(AVFormatContext));
strcpy(ic->filename, filename);
......@@ -1703,7 +1856,18 @@ void opt_input_file(const char *filename)
case CODEC_TYPE_VIDEO:
frame_height = enc->height;
frame_width = enc->width;
frame_rate = enc->frame_rate;
rfps = enc->frame_rate;
if (enc->codec_id == CODEC_ID_MPEG1VIDEO) {
rfps = get_real_fps(ic, fmt, ap, i);
}
if (rfps > 0 && rfps != enc->frame_rate) {
frame_rate = rfps;
fprintf(stderr,"\nSeems that stream %d comes from film source: %2.2f->%2.2f\n",
i, (float)enc->frame_rate / FRAME_RATE_BASE,
(float)rfps / FRAME_RATE_BASE);
} else
frame_rate = enc->frame_rate;
ic->streams[i]->r_frame_rate = rfps;
break;
default:
abort();
......
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