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hwcontext: Add device derivation

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Creates a new device context from another of a different type which
refers to the same underlying hardware.

(cherry picked from commit b266ad56fe)
This commit is contained in:
Mark Thompson
2017-03-04 23:57:28 +00:00
parent 92bd089745
commit b22172f6f3
5 changed files with 103 additions and 1 deletions
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65
libavutil/hwcontext.c
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@@ -68,6 +68,8 @@ static void hwdevice_ctx_free(void *opaque, uint8_t *data)
if (ctx->free)
ctx->free(ctx);
av_buffer_unref(&ctx->internal->source_device);
av_freep(&ctx->hwctx);
av_freep(&ctx->internal->priv);
av_freep(&ctx->internal);
@@ -538,6 +540,69 @@ fail:
return ret;
}
int av_hwdevice_ctx_create_derived(AVBufferRef **dst_ref_ptr,
enum AVHWDeviceType type,
AVBufferRef *src_ref, int flags)
{
AVBufferRef *dst_ref = NULL, *tmp_ref;
AVHWDeviceContext *dst_ctx, *tmp_ctx;
int ret = 0;
tmp_ref = src_ref;
while (tmp_ref) {
tmp_ctx = (AVHWDeviceContext*)tmp_ref->data;
if (tmp_ctx->type == type) {
dst_ref = av_buffer_ref(tmp_ref);
if (!dst_ref) {
ret = AVERROR(ENOMEM);
goto fail;
}
goto done;
}
tmp_ref = tmp_ctx->internal->source_device;
}
dst_ref = av_hwdevice_ctx_alloc(type);
if (!dst_ref) {
ret = AVERROR(ENOMEM);
goto fail;
}
dst_ctx = (AVHWDeviceContext*)dst_ref->data;
tmp_ref = src_ref;
while (tmp_ref) {
tmp_ctx = (AVHWDeviceContext*)tmp_ref->data;
if (dst_ctx->internal->hw_type->device_derive) {
ret = dst_ctx->internal->hw_type->device_derive(dst_ctx,
tmp_ctx,
flags);
if (ret == 0) {
dst_ctx->internal->source_device = av_buffer_ref(src_ref);
if (!dst_ctx->internal->source_device) {
ret = AVERROR(ENOMEM);
goto fail;
}
goto done;
}
if (ret != AVERROR(ENOSYS))
goto fail;
}
tmp_ref = tmp_ctx->internal->source_device;
}
ret = AVERROR(ENOSYS);
goto fail;
done:
*dst_ref_ptr = dst_ref;
return 0;
fail:
av_buffer_unref(&dst_ref);
*dst_ref_ptr = NULL;
return ret;
}
static void ff_hwframe_unmap(void *opaque, uint8_t *data)
{
HWMapDescriptor *hwmap = (HWMapDescriptor*)data;