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Code Issues Releases Activity

doc/examples/transcoding: use av_packet_alloc() to allocate packets

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Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2021-01-31 14:28:13 -03:00
parent 16dba17329
commit b896832b78
1 changed files with 28 additions and 20 deletions
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48
doc/examples/transcoding.c
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@ -42,6 +42,7 @@ typedef struct FilteringContext {
AVFilterContext *buffersrc_ctx;
AVFilterGraph *filter_graph;
AVPacket *enc_pkt;
AVFrame *filtered_frame;
} FilteringContext;
static FilteringContext *filter_ctx;
@ -407,6 +408,10 @@ static int init_filters(void)
if (ret)
return ret;
filter_ctx[i].enc_pkt = av_packet_alloc();
if (!filter_ctx[i].enc_pkt)
return AVERROR(ENOMEM);
filter_ctx[i].filtered_frame = av_frame_alloc();
if (!filter_ctx[i].filtered_frame)
return AVERROR(ENOMEM);
@ -414,17 +419,17 @@ static int init_filters(void)
return 0;
}
static int encode_write_frame(AVFrame *filt_frame, unsigned int stream_index)
static int encode_write_frame(unsigned int stream_index, int flush)
{
StreamContext *stream = &stream_ctx[stream_index];
FilteringContext *filter = &filter_ctx[stream_index];
AVFrame *filt_frame = flush ? NULL : filter->filtered_frame;
AVPacket *enc_pkt = filter->enc_pkt;
int ret;
AVPacket enc_pkt;
av_log(NULL, AV_LOG_INFO, "Encoding frame\n");
/* encode filtered frame */
enc_pkt.data = NULL;
enc_pkt.size = 0;
av_init_packet(&enc_pkt);
av_packet_unref(enc_pkt);
ret = avcodec_send_frame(stream->enc_ctx, filt_frame);
@ -432,20 +437,20 @@ static int encode_write_frame(AVFrame *filt_frame, unsigned int stream_index)
return ret;
while (ret >= 0) {
ret = avcodec_receive_packet(stream->enc_ctx, &enc_pkt);
ret = avcodec_receive_packet(stream->enc_ctx, enc_pkt);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
return 0;
/* prepare packet for muxing */
enc_pkt.stream_index = stream_index;
av_packet_rescale_ts(&enc_pkt,
enc_pkt->stream_index = stream_index;
av_packet_rescale_ts(enc_pkt,
stream->enc_ctx->time_base,
ofmt_ctx->streams[stream_index]->time_base);
av_log(NULL, AV_LOG_DEBUG, "Muxing frame\n");
/* mux encoded frame */
ret = av_interleaved_write_frame(ofmt_ctx, &enc_pkt);
ret = av_interleaved_write_frame(ofmt_ctx, enc_pkt);
}
return ret;
@ -481,7 +486,7 @@ static int filter_encode_write_frame(AVFrame *frame, unsigned int stream_index)
}
filter->filtered_frame->pict_type = AV_PICTURE_TYPE_NONE;
ret = encode_write_frame(filter->filtered_frame, stream_index);
ret = encode_write_frame(stream_index, 0);
av_frame_unref(filter->filtered_frame);
if (ret < 0)
break;
@ -497,13 +502,13 @@ static int flush_encoder(unsigned int stream_index)
return 0;
av_log(NULL, AV_LOG_INFO, "Flushing stream #%u encoder\n", stream_index);
return encode_write_frame(NULL, stream_index);
return encode_write_frame(stream_index, 1);
}
int main(int argc, char **argv)
{
int ret;
AVPacket packet = { .data = NULL, .size = 0 };
AVPacket *packet = NULL;
unsigned int stream_index;
unsigned int i;
@ -518,12 +523,14 @@ int main(int argc, char **argv)
goto end;
if ((ret = init_filters()) < 0)
goto end;
if (!(packet = av_packet_alloc()))
goto end;
/* read all packets */
while (1) {
if ((ret = av_read_frame(ifmt_ctx, &packet)) < 0)
if ((ret = av_read_frame(ifmt_ctx, packet)) < 0)
break;
stream_index = packet.stream_index;
stream_index = packet->stream_index;
av_log(NULL, AV_LOG_DEBUG, "Demuxer gave frame of stream_index %u\n",
stream_index);
@ -532,10 +539,10 @@ int main(int argc, char **argv)
av_log(NULL, AV_LOG_DEBUG, "Going to reencode&filter the frame\n");
av_packet_rescale_ts(&packet,
av_packet_rescale_ts(packet,
ifmt_ctx->streams[stream_index]->time_base,
stream->dec_ctx->time_base);
ret = avcodec_send_packet(stream->dec_ctx, &packet);
ret = avcodec_send_packet(stream->dec_ctx, packet);
if (ret < 0) {
av_log(NULL, AV_LOG_ERROR, "Decoding failed\n");
break;
@ -555,15 +562,15 @@ int main(int argc, char **argv)
}
} else {
/* remux this frame without reencoding */
av_packet_rescale_ts(&packet,
av_packet_rescale_ts(packet,
ifmt_ctx->streams[stream_index]->time_base,
ofmt_ctx->streams[stream_index]->time_base);
ret = av_interleaved_write_frame(ofmt_ctx, &packet);
ret = av_interleaved_write_frame(ofmt_ctx, packet);
if (ret < 0)
goto end;
}
av_packet_unref(&packet);
av_packet_unref(packet);
}
/* flush filters and encoders */
@ -587,13 +594,14 @@ int main(int argc, char **argv)
av_write_trailer(ofmt_ctx);
end:
av_packet_unref(&packet);
av_packet_free(&packet);
for (i = 0; i < ifmt_ctx->nb_streams; i++) {
avcodec_free_context(&stream_ctx[i].dec_ctx);
if (ofmt_ctx && ofmt_ctx->nb_streams > i && ofmt_ctx->streams[i] && stream_ctx[i].enc_ctx)
avcodec_free_context(&stream_ctx[i].enc_ctx);
if (filter_ctx && filter_ctx[i].filter_graph) {
avfilter_graph_free(&filter_ctx[i].filter_graph);
av_packet_free(&filter_ctx[i].enc_pkt);
av_frame_free(&filter_ctx[i].filtered_frame);
}