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lavc: add avcodec_is_open().

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It allows to check whether an AVCodecContext is open in a documented
way. Right now the undocumented way this check is done in lavf/lavc is
by checking whether AVCodecContext.codec is NULL. However it's desirable
to be able to set AVCodecContext.codec before avcodec_open2().
This commit is contained in:
Anton Khirnov 2011-12-08 06:57:44 +01:00
parent f7fe41a04f
commit af08d9aeea
5 changed files with 20 additions and 4 deletions
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3
doc/APIchanges
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@ -13,6 +13,9 @@ libavutil: 2011-04-18
API changes, most recent first:
2012-01-31 - xxxxxxx - lavc 54.01.0
Add avcodec_is_open() function.
2012-01-30 - xxxxxxx - lavu 51.22.0 - intfloat.h
Add a new installed header libavutil/intfloat.h with int/float punning
functions.

6
libavcodec/avcodec.h
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@ -4183,4 +4183,10 @@ enum AVMediaType avcodec_get_type(enum CodecID codec_id);
*/
const AVClass *avcodec_get_class(void);
/**
* @return a positive value if s is open (i.e. avcodec_open2() was called on it
* with no corresponding avcodec_close()), 0 otherwise.
*/
int avcodec_is_open(AVCodecContext *s);
#endif /* AVCODEC_AVCODEC_H */

2
libavcodec/options.c
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@ -485,7 +485,7 @@ AVCodecContext *avcodec_alloc_context3(AVCodec *codec){
int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
{
if (dest->codec) { // check that the dest context is uninitialized
if (avcodec_is_open(dest)) { // check that the dest context is uninitialized
av_log(dest, AV_LOG_ERROR,
"Tried to copy AVCodecContext %p into already-initialized %p\n",
src, dest);

8
libavcodec/utils.c
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@ -627,6 +627,9 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVD
int ret = 0;
AVDictionary *tmp = NULL;
if (avcodec_is_open(avctx))
return 0;
if (avctx->extradata_size < 0 || avctx->extradata_size >= FF_MAX_EXTRADATA_SIZE)
return AVERROR(EINVAL);
@ -1803,3 +1806,8 @@ enum AVMediaType avcodec_get_type(enum CodecID codec_id)
return AVMEDIA_TYPE_UNKNOWN;
}
int avcodec_is_open(AVCodecContext *s)
{
return !!s->internal;
}

5
libavformat/utils.c
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@ -2006,7 +2006,7 @@ static int try_decode_frame(AVStream *st, AVPacket *avpkt, AVDictionary **option
AVFrame picture;
AVPacket pkt = *avpkt;
if(!st->codec->codec){
if (!avcodec_is_open(st->codec)) {
AVDictionary *thread_opt = NULL;
codec = avcodec_find_decoder(st->codec->codec_id);
@ -2354,8 +2354,7 @@ int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
// close codecs which were opened in try_decode_frame()
for(i=0;i<ic->nb_streams;i++) {
st = ic->streams[i];
if(st->codec->codec)
avcodec_close(st->codec);
avcodec_close(st->codec);
}
for(i=0;i<ic->nb_streams;i++) {
st = ic->streams[i];