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lavu/hwcontext: clarify behavior on av_hwframe_map() failure

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Clear anything that av_hwframe_map() might have done to the destination
frame, but leave caller-provided fields unchanged.
This commit is contained in:
Anton Khirnov 2022-01-19 14:37:51 +01:00
parent 6fc5e5a52c
commit 09ca2f1950
2 changed files with 29 additions and 2 deletions
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27
libavutil/hwcontext.c
View File

@ -18,6 +18,7 @@
#include "config.h"
#include "avassert.h"
#include "buffer.h"
#include "common.h"
#include "hwcontext.h"
@ -788,6 +789,8 @@ fail:
int av_hwframe_map(AVFrame *dst, const AVFrame *src, int flags)
{
AVBufferRef *orig_dst_frames = dst->hw_frames_ctx;
enum AVPixelFormat orig_dst_fmt = dst->format;
AVHWFramesContext *src_frames, *dst_frames;
HWMapDescriptor *hwmap;
int ret;
@ -824,8 +827,10 @@ int av_hwframe_map(AVFrame *dst, const AVFrame *src, int flags)
src_frames->internal->hw_type->map_from) {
ret = src_frames->internal->hw_type->map_from(src_frames,
dst, src, flags);
if (ret != AVERROR(ENOSYS))
if (ret >= 0)
return ret;
else if (ret != AVERROR(ENOSYS))
goto fail;
}
}
@ -836,12 +841,30 @@ int av_hwframe_map(AVFrame *dst, const AVFrame *src, int flags)
dst_frames->internal->hw_type->map_to) {
ret = dst_frames->internal->hw_type->map_to(dst_frames,
dst, src, flags);
if (ret != AVERROR(ENOSYS))
if (ret >= 0)
return ret;
else if (ret != AVERROR(ENOSYS))
goto fail;
}
}
return AVERROR(ENOSYS);
fail:
// if the caller provided dst frames context, it should be preserved
// by this function
av_assert0(orig_dst_frames == NULL ||
orig_dst_frames == dst->hw_frames_ctx);
// preserve user-provided dst frame fields, but clean
// anything we might have set
dst->hw_frames_ctx = NULL;
av_frame_unref(dst);
dst->hw_frames_ctx = orig_dst_frames;
dst->format = orig_dst_fmt;
return ret;
}
int av_hwframe_ctx_create_derived(AVBufferRef **derived_frame_ctx,

4
libavutil/hwcontext.h
View File

@ -571,6 +571,10 @@ enum {
* possible with the given arguments and hwframe setup, while other return
* values indicate that it failed somehow.
*
* On failure, the destination frame will be left blank, except for the
* hw_frames_ctx/format fields thay may have been set by the caller - those will
* be preserved as they were.
*
* @param dst Destination frame, to contain the mapping.
* @param src Source frame, to be mapped.
* @param flags Some combination of AV_HWFRAME_MAP_* flags.