virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00
Code Issues Releases Activity

lavf: refactor av_read_frame() to make it easier to understand.

Browse Source
This commit is contained in:
Anton Khirnov 2012-01-05 10:14:07 +01:00
parent 7f09791d28
commit 6450599e22
1 changed files with 33 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
libavformat/utils.c
View File

@ -31,6 +31,7 @@
#include "libavutil/pixdesc.h"
#include "metadata.h"
#include "id3v2.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/mathematics.h"
#include "libavutil/parseutils.h"
@ -1248,18 +1249,34 @@ static int read_frame_internal(AVFormatContext *s, AVPacket *pkt)
return 0;
}
static int read_from_packet_buffer(AVFormatContext *s, AVPacket *pkt)
{
AVPacketList *pktl = s->packet_buffer;
av_assert0(pktl);
*pkt = pktl->pkt;
s->packet_buffer = pktl->next;
av_freep(&pktl);
return 0;
}
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
{
AVPacketList *pktl;
int eof=0;
const int genpts= s->flags & AVFMT_FLAG_GENPTS;
if (!genpts)
return s->packet_buffer ? read_from_packet_buffer(s, pkt) :
read_frame_internal(s, pkt);
for(;;){
int ret;
pktl = s->packet_buffer;
if (pktl) {
AVPacket *next_pkt= &pktl->pkt;
if(genpts && next_pkt->dts != AV_NOPTS_VALUE){
if (next_pkt->dts != AV_NOPTS_VALUE) {
int wrap_bits = s->streams[next_pkt->stream_index]->pts_wrap_bits;
while(pktl && next_pkt->pts == AV_NOPTS_VALUE){
if( pktl->pkt.stream_index == next_pkt->stream_index
@ -1272,33 +1289,24 @@ int av_read_frame(AVFormatContext *s, AVPacket *pkt)
pktl = s->packet_buffer;
}
if( next_pkt->pts != AV_NOPTS_VALUE
|| next_pkt->dts == AV_NOPTS_VALUE
|| !genpts || eof){
/* read packet from packet buffer, if there is data */
*pkt = *next_pkt;
s->packet_buffer = pktl->next;
av_free(pktl);
return 0;
}
/* read packet from packet buffer, if there is data */
if (!(next_pkt->pts == AV_NOPTS_VALUE &&
next_pkt->dts != AV_NOPTS_VALUE && !eof))
return read_from_packet_buffer(s, pkt);
}
if(genpts){
int ret= read_frame_internal(s, pkt);
if(ret<0){
if(pktl && ret != AVERROR(EAGAIN)){
eof=1;
continue;
}else
return ret;
}
if(av_dup_packet(add_to_pktbuf(&s->packet_buffer, pkt,
&s->packet_buffer_end)) < 0)
return AVERROR(ENOMEM);
}else{
assert(!s->packet_buffer);
return read_frame_internal(s, pkt);
ret = read_frame_internal(s, pkt);
if (ret < 0) {
if (pktl && ret != AVERROR(EAGAIN)) {
eof = 1;
continue;
} else
return ret;
}
if (av_dup_packet(add_to_pktbuf(&s->packet_buffer, pkt,
&s->packet_buffer_end)) < 0)
return AVERROR(ENOMEM);
}
}