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lavc: set AVCodecContext.codec in avcodec_get_context_defaults3().

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This way, if the AVCodecContext is allocated for a specific codec, the
caller doesn't need to store this codec separately and then pass it
again to avcodec_open2().

It also allows to set codec private options using av_opt_set_* before
opening the codec.
This commit is contained in:
Anton Khirnov 2012-01-28 19:15:15 +01:00
parent 0e72ad95f9
commit bc90199848
4 changed files with 23 additions and 8 deletions
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5
libavcodec/avcodec.h
View File

@ -3525,6 +3525,11 @@ int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2,
* @endcode
*
* @param avctx The context to initialize.
* @param codec The codec to open this context for. If a non-NULL codec has been
* previously passed to avcodec_alloc_context3() or
* avcodec_get_context_defaults3() for this context, then this
* parameter MUST be either NULL or equal to the previously passed
* codec.
* @param options A dictionary filled with AVCodecContext and codec-private options.
* On return this object will be filled with options that were not found.
*

1
libavcodec/options.c
View File

@ -432,6 +432,7 @@ int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec){
s->av_class = &av_codec_context_class;
s->codec_type = codec ? codec->type : AVMEDIA_TYPE_UNKNOWN;
s->codec = codec;
av_opt_set_defaults(s);
s->time_base = (AVRational){0,1};

17
libavcodec/utils.c
View File

@ -630,6 +630,18 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVD
if (avcodec_is_open(avctx))
return 0;
if ((!codec && !avctx->codec)) {
av_log(avctx, AV_LOG_ERROR, "No codec provided to avcodec_open2().\n");
return AVERROR(EINVAL);
}
if ((codec && avctx->codec && codec != avctx->codec)) {
av_log(avctx, AV_LOG_ERROR, "This AVCodecContext was allocated for %s, "
"but %s passed to avcodec_open2().\n", avctx->codec->name, codec->name);
return AVERROR(EINVAL);
}
if (!codec)
codec = avctx->codec;
if (avctx->extradata_size < 0 || avctx->extradata_size >= FF_MAX_EXTRADATA_SIZE)
return AVERROR(EINVAL);
@ -649,11 +661,6 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVD
goto end;
}
if(avctx->codec || !codec) {
ret = AVERROR(EINVAL);
goto end;
}
avctx->internal = av_mallocz(sizeof(AVCodecInternal));
if (!avctx->internal) {
ret = AVERROR(ENOMEM);

8
libavformat/utils.c
View File

@ -2009,7 +2009,9 @@ static int try_decode_frame(AVStream *st, AVPacket *avpkt, AVDictionary **option
if (!avcodec_is_open(st->codec)) {
AVDictionary *thread_opt = NULL;
codec = avcodec_find_decoder(st->codec->codec_id);
codec = st->codec->codec ? st->codec->codec :
avcodec_find_decoder(st->codec->codec_id);
if (!codec)
return -1;
@ -2169,8 +2171,8 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
st->parser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
}
}
assert(!st->codec->codec);
codec = avcodec_find_decoder(st->codec->codec_id);
codec = st->codec->codec ? st->codec->codec :
avcodec_find_decoder(st->codec->codec_id);
/* force thread count to 1 since the h264 decoder will not extract SPS
* and PPS to extradata during multi-threaded decoding */