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examples/muxing: Don't use stack packet 

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2021-09-03 22:56:09 +02:00
parent 53f374c08d
commit 0230d125cb
1 changed files with 17 additions and 10 deletions
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27
doc/examples/muxing.c
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@ -62,6 +62,8 @@ typedef struct OutputStream {
AVFrame *frame; AVFrame *frame;
AVFrame *tmp_frame; AVFrame *tmp_frame;
AVPacket *tmp_pkt;
float t, tincr, tincr2; float t, tincr, tincr2;
struct SwsContext *sws_ctx; struct SwsContext *sws_ctx;
@ -80,7 +82,7 @@ static void log_packet(const AVFormatContext *fmt_ctx, const AVPacket *pkt)
} }
static int write_frame(AVFormatContext *fmt_ctx, AVCodecContext *c, static int write_frame(AVFormatContext *fmt_ctx, AVCodecContext *c,
AVStream *st, AVFrame *frame) AVStream *st, AVFrame *frame, AVPacket *pkt)
{ {
int ret; int ret;
@ -93,9 +95,7 @@ static int write_frame(AVFormatContext *fmt_ctx, AVCodecContext *c,
} }
while (ret >= 0) { while (ret >= 0) {
AVPacket pkt = { 0 }; ret = avcodec_receive_packet(c, pkt);
ret = avcodec_receive_packet(c, &pkt);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
break; break;
else if (ret < 0) { else if (ret < 0) {
@ -104,12 +104,12 @@ static int write_frame(AVFormatContext *fmt_ctx, AVCodecContext *c,
} }
/* rescale output packet timestamp values from codec to stream timebase */ /* rescale output packet timestamp values from codec to stream timebase */
av_packet_rescale_ts(&pkt, c->time_base, st->time_base); av_packet_rescale_ts(pkt, c->time_base, st->time_base);
pkt.stream_index = st->index; pkt->stream_index = st->index;
/* Write the compressed frame to the media file. */ /* Write the compressed frame to the media file. */
log_packet(fmt_ctx, &pkt); log_packet(fmt_ctx, pkt);
ret = av_interleaved_write_frame(fmt_ctx, &pkt); ret = av_interleaved_write_frame(fmt_ctx, pkt);
/* pkt is now blank (av_interleaved_write_frame() takes ownership of /* pkt is now blank (av_interleaved_write_frame() takes ownership of
* its contents and resets pkt), so that no unreferencing is necessary. * its contents and resets pkt), so that no unreferencing is necessary.
* This would be different if one used av_write_frame(). */ * This would be different if one used av_write_frame(). */
@ -138,6 +138,12 @@ static void add_stream(OutputStream *ost, AVFormatContext *oc,
exit(1); exit(1);
} }
ost->tmp_pkt = av_packet_alloc();
if (!ost->tmp_pkt) {
fprintf(stderr, "Could not allocate AVPacket\n");
exit(1);
}
ost->st = avformat_new_stream(oc, NULL); ost->st = avformat_new_stream(oc, NULL);
if (!ost->st) { if (!ost->st) {
fprintf(stderr, "Could not allocate stream\n"); fprintf(stderr, "Could not allocate stream\n");
@ -380,7 +386,7 @@ static int write_audio_frame(AVFormatContext *oc, OutputStream *ost)
ost->samples_count += dst_nb_samples; ost->samples_count += dst_nb_samples;
} }
return write_frame(oc, c, ost->st, frame); return write_frame(oc, c, ost->st, frame, ost->tmp_pkt);
} }
/**************************************************************/ /**************************************************************/
@ -523,7 +529,7 @@ static AVFrame *get_video_frame(OutputStream *ost)
*/ */
static int write_video_frame(AVFormatContext *oc, OutputStream *ost) static int write_video_frame(AVFormatContext *oc, OutputStream *ost)
{ {
return write_frame(oc, ost->enc, ost->st, get_video_frame(ost)); return write_frame(oc, ost->enc, ost->st, get_video_frame(ost), ost->tmp_pkt);
} }
static void close_stream(AVFormatContext *oc, OutputStream *ost) static void close_stream(AVFormatContext *oc, OutputStream *ost)
@ -531,6 +537,7 @@ static void close_stream(AVFormatContext *oc, OutputStream *ost)
avcodec_free_context(&ost->enc); avcodec_free_context(&ost->enc);
av_frame_free(&ost->frame); av_frame_free(&ost->frame);
av_frame_free(&ost->tmp_frame); av_frame_free(&ost->tmp_frame);
av_packet_free(&ost->tmp_pkt);
sws_freeContext(ost->sws_ctx); sws_freeContext(ost->sws_ctx);
swr_free(&ost->swr_ctx); swr_free(&ost->swr_ctx);
} }