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avcodec/decode: add a flags parameter to ff_reget_buffer()

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Some decoders may not need a writable buffer in some specific cases, but only
a reference to the existing buffer with updated frame properties instead, for
the purpose of returning duplicate frames. For this, the
FF_REGET_BUFFER_FLAG_READONLY flag is added, which will prevent potential
allocations and buffer copies when they are not needed.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
2019-08-30 11:37:25 -03:00
parent 39f1295937
commit 9ea6d2149e
48 changed files with 58 additions and 57 deletions
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8
libavcodec/decode.c
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@@ -1970,7 +1970,7 @@ int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
return ret;
}
static int reget_buffer_internal(AVCodecContext *avctx, AVFrame *frame)
static int reget_buffer_internal(AVCodecContext *avctx, AVFrame *frame, int flags)
{
AVFrame *tmp;
int ret;
@@ -1986,7 +1986,7 @@ static int reget_buffer_internal(AVCodecContext *avctx, AVFrame *frame)
if (!frame->data[0])
return ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF);
if (av_frame_is_writable(frame))
if ((flags & FF_REGET_BUFFER_FLAG_READONLY) || av_frame_is_writable(frame))
return ff_decode_frame_props(avctx, frame);
tmp = av_frame_alloc();
@@ -2007,9 +2007,9 @@ static int reget_buffer_internal(AVCodecContext *avctx, AVFrame *frame)
return 0;
}
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
{
int ret = reget_buffer_internal(avctx, frame);
int ret = reget_buffer_internal(avctx, frame, flags);
if (ret < 0)
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
return ret;