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lavc: deprecate avcodec_get_context_defaults3()

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This function is supposed to "reset" a codec context to a clean state so
that it can be opened again. The only reason it exists is to allow using
AVStream.codec as a decoding context (after it was already
opened/used/closed by avformat_find_stream_info()). Since that behaviour
is now deprecated, there is no reason for this function to exist
anymore.
This commit is contained in:
Anton Khirnov 2016-05-21 11:57:28 +02:00
parent 5f30ac2779
commit 04fc8e24a0
3 changed files with 21 additions and 16 deletions
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23
libavcodec/avcodec.h
View File

@ -3619,7 +3619,6 @@ void avcodec_register_all(void);
* important mainly for encoders, e.g. libx264).
*
* @return An AVCodecContext filled with default values or NULL on failure.
* @see avcodec_get_context_defaults
*/
AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
@ -3629,16 +3628,14 @@ AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
*/
void avcodec_free_context(AVCodecContext **avctx);
#if FF_API_GET_CONTEXT_DEFAULTS
/**
* Set the fields of the given AVCodecContext to default values corresponding
* to the given codec (defaults may be codec-dependent).
*
* Do not call this function if a non-NULL codec has been passed
* to avcodec_alloc_context3() that allocated this AVCodecContext.
* If codec is non-NULL, it is illegal to call avcodec_open2() with a
* different codec on this AVCodecContext.
* @deprecated This function should not be used, as closing and opening a codec
* context multiple time is not supported. A new codec context should be
* allocated for each new use.
*/
int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
#endif
/**
* Get the AVClass for AVCodecContext. It can be used in combination with
@ -3741,9 +3738,8 @@ int avcodec_parameters_to_context(AVCodecContext *codec,
* @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.
* 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.
*
@ -3758,9 +3754,8 @@ int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **op
* (but not the AVCodecContext itself).
*
* Calling this function on an AVCodecContext that hasn't been opened will free
* the codec-specific data allocated in avcodec_alloc_context3() /
* avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
* do nothing.
* the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
* codec. Subsequent calls will do nothing.
*/
int avcodec_close(AVCodecContext *avctx);

11
libavcodec/options.c
View File

@ -80,7 +80,7 @@ static const AVClass av_codec_context_class = {
.child_class_next = codec_child_class_next,
};
int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
static int init_context_defaults(AVCodecContext *s, const AVCodec *codec)
{
memset(s, 0, sizeof(AVCodecContext));
@ -125,6 +125,13 @@ int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
return 0;
}
#if FF_API_GET_CONTEXT_DEFAULTS
int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec)
{
return init_context_defaults(s, codec);
}
#endif
AVCodecContext *avcodec_alloc_context3(const AVCodec *codec)
{
AVCodecContext *avctx= av_malloc(sizeof(AVCodecContext));
@ -132,7 +139,7 @@ AVCodecContext *avcodec_alloc_context3(const AVCodec *codec)
if (!avctx)
return NULL;
if(avcodec_get_context_defaults3(avctx, codec) < 0){
if (init_context_defaults(avctx, codec) < 0) {
av_free(avctx);
return NULL;
}

3
libavcodec/version.h
View File

@ -203,5 +203,8 @@
#ifndef FF_API_COPY_CONTEXT
#define FF_API_COPY_CONTEXT (LIBAVCODEC_VERSION_MAJOR < 59)
#endif
#ifndef FF_API_GET_CONTEXT_DEFAULTS
#define FF_API_GET_CONTEXT_DEFAULTS (LIBAVCODEC_VERSION_MAJOR < 59)
#endif
#endif /* AVCODEC_VERSION_H */