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examples/muxing: set codec in the codec context

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Make add_{audio,video}_stream return the found codec, and pass it to
avcodec_open2() through open_{audio,video} functions.

Fix failure:
No codec provided to avcodec_open2().
could not open codec

This is also consistent with the use of the avcodec_open2() API in the
codebase.
This commit is contained in:
Stefano Sabatini 2012-08-03 17:57:45 +02:00
parent 8993c25695
commit 13bbc464ed
1 changed files with 20 additions and 19 deletions
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39
doc/examples/muxing.c
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@ -57,20 +57,20 @@ static int audio_input_frame_size;
/* /*
* add an audio output stream * add an audio output stream
*/ */
static AVStream *add_audio_stream(AVFormatContext *oc, enum CodecID codec_id) static AVStream *add_audio_stream(AVFormatContext *oc, AVCodec **codec,
enum CodecID codec_id)
{ {
AVCodecContext *c; AVCodecContext *c;
AVStream *st; AVStream *st;
AVCodec *codec;
/* find the audio encoder */ /* find the audio encoder */
codec = avcodec_find_encoder(codec_id); *codec = avcodec_find_encoder(codec_id);
if (!codec) { if (!(*codec)) {
fprintf(stderr, "codec not found\n"); fprintf(stderr, "codec not found\n");
exit(1); exit(1);
} }
st = avformat_new_stream(oc, codec); st = avformat_new_stream(oc, *codec);
if (!st) { if (!st) {
fprintf(stderr, "Could not alloc stream\n"); fprintf(stderr, "Could not alloc stream\n");
exit(1); exit(1);
@ -92,14 +92,14 @@ static AVStream *add_audio_stream(AVFormatContext *oc, enum CodecID codec_id)
return st; return st;
} }
static void open_audio(AVFormatContext *oc, AVStream *st) static void open_audio(AVFormatContext *oc, AVCodec *codec, AVStream *st)
{ {
AVCodecContext *c; AVCodecContext *c;
c = st->codec; c = st->codec;
/* open it */ /* open it */
if (avcodec_open2(c, NULL, NULL) < 0) { if (avcodec_open2(c, codec, NULL) < 0) {
fprintf(stderr, "could not open codec\n"); fprintf(stderr, "could not open codec\n");
exit(1); exit(1);
} }
@ -182,20 +182,20 @@ static uint8_t *video_outbuf;
static int frame_count, video_outbuf_size; static int frame_count, video_outbuf_size;
/* Add a video output stream. */ /* Add a video output stream. */
static AVStream *add_video_stream(AVFormatContext *oc, enum CodecID codec_id) static AVStream *add_video_stream(AVFormatContext *oc, AVCodec **codec,
enum CodecID codec_id)
{ {
AVCodecContext *c; AVCodecContext *c;
AVStream *st; AVStream *st;
AVCodec *codec;
/* find the video encoder */ /* find the video encoder */
codec = avcodec_find_encoder(codec_id); *codec = avcodec_find_encoder(codec_id);
if (!codec) { if (!(*codec)) {
fprintf(stderr, "codec not found\n"); fprintf(stderr, "codec not found\n");
exit(1); exit(1);
} }
st = avformat_new_stream(oc, codec); st = avformat_new_stream(oc, *codec);
if (!st) { if (!st) {
fprintf(stderr, "Could not alloc stream\n"); fprintf(stderr, "Could not alloc stream\n");
exit(1); exit(1);
@ -203,7 +203,7 @@ static AVStream *add_video_stream(AVFormatContext *oc, enum CodecID codec_id)
c = st->codec; c = st->codec;
avcodec_get_context_defaults3(c, codec); avcodec_get_context_defaults3(c, *codec);
c->codec_id = codec_id; c->codec_id = codec_id;
@ -245,14 +245,14 @@ static AVFrame *alloc_picture(enum PixelFormat pix_fmt, int width, int height)
return picture; return picture;
} }
static void open_video(AVFormatContext *oc, AVStream *st) static void open_video(AVFormatContext *oc, AVCodec *codec, AVStream *st)
{ {
AVCodecContext *c; AVCodecContext *c;
c = st->codec; c = st->codec;
/* open the codec */ /* open the codec */
if (avcodec_open2(c, NULL, NULL) < 0) { if (avcodec_open2(c, codec, NULL) < 0) {
fprintf(stderr, "could not open codec\n"); fprintf(stderr, "could not open codec\n");
exit(1); exit(1);
} }
@ -412,6 +412,7 @@ int main(int argc, char **argv)
AVOutputFormat *fmt; AVOutputFormat *fmt;
AVFormatContext *oc; AVFormatContext *oc;
AVStream *audio_st, *video_st; AVStream *audio_st, *video_st;
AVCodec *audio_codec, *video_codec;
double audio_pts, video_pts; double audio_pts, video_pts;
int i; int i;
@ -445,18 +446,18 @@ int main(int argc, char **argv)
video_st = NULL; video_st = NULL;
audio_st = NULL; audio_st = NULL;
if (fmt->video_codec != CODEC_ID_NONE) { if (fmt->video_codec != CODEC_ID_NONE) {
video_st = add_video_stream(oc, fmt->video_codec); video_st = add_video_stream(oc, &video_codec, fmt->video_codec);
} }
if (fmt->audio_codec != CODEC_ID_NONE) { if (fmt->audio_codec != CODEC_ID_NONE) {
audio_st = add_audio_stream(oc, fmt->audio_codec); audio_st = add_audio_stream(oc, &audio_codec, fmt->audio_codec);
} }
/* Now that all the parameters are set, we can open the audio and /* Now that all the parameters are set, we can open the audio and
* video codecs and allocate the necessary encode buffers. */ * video codecs and allocate the necessary encode buffers. */
if (video_st) if (video_st)
open_video(oc, video_st); open_video(oc, video_codec, video_st);
if (audio_st) if (audio_st)
open_audio(oc, audio_st); open_audio(oc, audio_codec, audio_st);
av_dump_format(oc, 0, filename, 1); av_dump_format(oc, 0, filename, 1);