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avutil/frame: add helper for adding existing side data to array

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This commit is contained in:
Jan Ekström 2023-10-12 23:25:54 +03:00
parent 53335f6cf4
commit 3c52f73e25
2 changed files with 69 additions and 0 deletions
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49
libavutil/frame.c
View File

@ -98,6 +98,23 @@ static void remove_side_data(AVFrameSideData ***sd, int *nb_side_data,
}
}
static void remove_side_data_by_entry(AVFrameSideData ***sd, int *nb_sd,
const AVFrameSideData *target)
{
for (int i = *nb_sd - 1; i >= 0; i--) {
AVFrameSideData *entry = ((*sd)[i]);
if (entry != target)
continue;
free_side_data(&entry);
((*sd)[i]) = ((*sd)[*nb_sd - 1]);
(*nb_sd)--;
return;
}
}
AVFrame *av_frame_alloc(void)
{
AVFrame *frame = av_malloc(sizeof(*frame));
@ -764,6 +781,38 @@ AVFrameSideData *av_frame_side_data_new(AVFrameSideData ***sd, int *nb_sd,
return ret;
}
int av_frame_side_data_clone(AVFrameSideData ***sd, int *nb_sd,
const AVFrameSideData *src, unsigned int flags)
{
AVBufferRef *buf = NULL;
AVFrameSideData *sd_dst = NULL;
int ret = AVERROR_BUG;
if (!sd || !src || !nb_sd || (*nb_sd && !*sd))
return AVERROR(EINVAL);
buf = av_buffer_ref(src->buf);
if (!buf)
return AVERROR(ENOMEM);
if (flags & AV_FRAME_SIDE_DATA_FLAG_UNIQUE)
remove_side_data(sd, nb_sd, src->type);
sd_dst = add_side_data_from_buf(sd, nb_sd, src->type, buf);
if (!sd_dst) {
av_buffer_unref(&buf);
return AVERROR(ENOMEM);
}
ret = av_dict_copy(&sd_dst->metadata, src->metadata, 0);
if (ret < 0) {
remove_side_data_by_entry(sd, nb_sd, sd_dst);
return ret;
}
return 0;
}
AVFrameSideData *av_frame_get_side_data(const AVFrame *frame,
enum AVFrameSideDataType type)
{

20
libavutil/frame.h
View File

@ -1021,6 +1021,26 @@ AVFrameSideData *av_frame_side_data_new(AVFrameSideData ***sd, int *nb_sd,
enum AVFrameSideDataType type,
size_t size, unsigned int flags);
/**
* Add a new side data entry to an array based on existing side data, taking
* a reference towards the contained AVBufferRef.
*
* @param sd pointer to array of side data to which to add another entry,
* or to NULL in order to start a new array.
* @param nb_sd pointer to an integer containing the number of entries in
* the array.
* @param src side data to be cloned, with a new reference utilized
* for the buffer.
* @param flags Some combination of AV_FRAME_SIDE_DATA_FLAG_* flags, or 0.
*
* @return negative error code on failure, >=0 on success. In case of
* AV_FRAME_SIDE_DATA_FLAG_UNIQUE being set, entries of matching
* AVFrameSideDataType will be removed before the addition is
* attempted.
*/
int av_frame_side_data_clone(AVFrameSideData ***sd, int *nb_sd,
const AVFrameSideData *src, unsigned int flags);
/**
* @}
*/