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Add avcodec_copy_context().

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Originally committed as revision 22750 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ronald S. Bultje 2010-03-31 20:40:49 +00:00
parent e33f1fa0a9
commit d103218046
2 changed files with 73 additions and 0 deletions
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13
libavcodec/avcodec.h
View File

@ -3258,6 +3258,19 @@ AVCodecContext *avcodec_alloc_context(void);
* we WILL change its arguments and name a few times! */
AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
/**
* Copy the settings of the source AVCodecContext into the destination
* AVCodecContext. The resulting destination codec context will be
* unopened, i.e. you are required to call avcodec_open() before you
* can use this AVCodecContext to decode/encode video/audio data.
*
* @param dest target codec context, should be initialized with
* avcodec_alloc_context(), but otherwise uninitialized
* @param src source codec context
* @return AVERROR() on error (e.g. memory allocation error), 0 on success
*/
int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
/**
* Sets the fields of the given AVFrame to default values.
*

60
libavcodec/options.c
View File

@ -471,3 +471,63 @@ AVCodecContext *avcodec_alloc_context(void){
return avcodec_alloc_context2(AVMEDIA_TYPE_UNKNOWN);
}
int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src)
{
if (dest->codec) { // 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);
return AVERROR(EINVAL);
}
memcpy(dest, src, sizeof(*dest));
/* set values specific to opened codecs back to their default state */
dest->priv_data = NULL;
dest->codec = NULL;
dest->palctrl = NULL;
dest->slice_offset = NULL;
dest->internal_buffer = NULL;
dest->hwaccel = NULL;
dest->execute = NULL;
dest->execute2 = NULL;
dest->reget_buffer = NULL;
dest->thread_opaque = NULL;
/* reallocate values that should be allocated separately */
dest->rc_eq = NULL;
dest->extradata = NULL;
dest->intra_matrix = NULL;
dest->inter_matrix = NULL;
dest->rc_override = NULL;
if (src->rc_eq) {
dest->rc_eq = av_strdup(src->rc_eq);
if (!dest->rc_eq)
return AVERROR(ENOMEM);
}
#define alloc_and_copy_or_fail(obj, size, pad) \
if (src->obj && size > 0) { \
dest->obj = av_malloc(size + pad); \
if (!dest->obj) \
goto fail; \
memcpy(dest->obj, src->obj, size); \
if (pad) \
memset(((uint8_t *) dest->obj) + size, 0, pad); \
}
alloc_and_copy_or_fail(extradata, src->extradata_size,
FF_INPUT_BUFFER_PADDING_SIZE);
alloc_and_copy_or_fail(intra_matrix, 64 * sizeof(int16_t), 0);
alloc_and_copy_or_fail(inter_matrix, 64 * sizeof(int16_t), 0);
alloc_and_copy_or_fail(rc_override, src->rc_override_count * sizeof(*src->rc_override), 0);
#undef alloc_and_copy_or_fail
return 0;
fail:
av_freep(&dest->rc_override);
av_freep(&dest->intra_matrix);
av_freep(&dest->inter_matrix);
av_freep(&dest->extradata);
av_freep(&dest->rc_eq);
return AVERROR(ENOMEM);
}