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avcodec/nvdec: avoid needless copy of output frame 

Replaces the data pointers with the mapped cuvid ones.
Adds buffer_refs to the frame to ensure the needed contexts stay alive
and the cuvid idx stays allocated.
Adds another buffer_ref to unmap the frame when it's unreferenced itself.
This commit is contained in:
Timo Rothenpieler 2018-05-07 18:23:38 +02:00
parent 2e700b082c
commit baabd3c2ad
1 changed files with 74 additions and 24 deletions
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98
libavcodec/nvdec.c
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@ -308,7 +308,7 @@ int ff_nvdec_decode_init(AVCodecContext *avctx)
params.CodecType = cuvid_codec_type;
params.ChromaFormat = cuvid_chroma_format;
params.ulNumDecodeSurfaces = frames_ctx->initial_pool_size;
params.ulNumOutputSurfaces = 1;
params.ulNumOutputSurfaces = frames_ctx->initial_pool_size;
ret = nvdec_decoder_create(&ctx->decoder_ref, frames_ctx->device_ref, &params, avctx);
if (ret < 0) {
@ -354,6 +354,32 @@ static void nvdec_fdd_priv_free(void *priv)
av_freep(&priv);
}
static void nvdec_unmap_mapped_frame(void *opaque, uint8_t *data)
{
NVDECFrame *unmap_data = (NVDECFrame*)data;
NVDECDecoder *decoder = (NVDECDecoder*)unmap_data->decoder_ref->data;
CUdeviceptr devptr = (CUdeviceptr)opaque;
CUresult err;
CUcontext dummy;
err = decoder->cudl->cuCtxPushCurrent(decoder->cuda_ctx);
if (err != CUDA_SUCCESS) {
av_log(NULL, AV_LOG_ERROR, "cuCtxPushCurrent failed\n");
goto finish;
}
err = decoder->cvdl->cuvidUnmapVideoFrame(decoder->decoder, devptr);
if (err != CUDA_SUCCESS)
av_log(NULL, AV_LOG_ERROR, "cuvidUnmapVideoFrame failed\n");
decoder->cudl->cuCtxPopCurrent(&dummy);
finish:
av_buffer_unref(&unmap_data->idx_ref);
av_buffer_unref(&unmap_data->decoder_ref);
av_free(unmap_data);
}
static int nvdec_retrieve_data(void *logctx, AVFrame *frame)
{
FrameDecodeData *fdd = (FrameDecodeData*)frame->private_ref->data;
@ -361,6 +387,7 @@ static int nvdec_retrieve_data(void *logctx, AVFrame *frame)
NVDECDecoder *decoder = (NVDECDecoder*)cf->decoder_ref->data;
CUVIDPROCPARAMS vpp = { .progressive_frame = 1 };
NVDECFrame *unmap_data = NULL;
CUresult err;
CUcontext dummy;
@ -383,32 +410,39 @@ static int nvdec_retrieve_data(void *logctx, AVFrame *frame)
goto finish;
}
for (i = 0; frame->data[i]; i++) {
CUDA_MEMCPY2D cpy = {
.srcMemoryType = CU_MEMORYTYPE_DEVICE,
.dstMemoryType = CU_MEMORYTYPE_DEVICE,
.srcDevice = devptr,
.dstDevice = (CUdeviceptr)frame->data[i],
.srcPitch = pitch,
.dstPitch = frame->linesize[i],
.srcY = offset,
.WidthInBytes = FFMIN(pitch, frame->linesize[i]),
.Height = frame->height >> (i ? 1 : 0),
};
err = decoder->cudl->cuMemcpy2D(&cpy);
if (err != CUDA_SUCCESS) {
av_log(logctx, AV_LOG_ERROR, "Error copying decoded frame: %d\n",
err);
ret = AVERROR_UNKNOWN;
goto copy_fail;
}
offset += cpy.Height;
unmap_data = av_mallocz(sizeof(*unmap_data));
if (!unmap_data) {
ret = AVERROR(ENOMEM);
goto copy_fail;
}
frame->buf[1] = av_buffer_create((uint8_t *)unmap_data, sizeof(*unmap_data),
nvdec_unmap_mapped_frame, (void*)devptr,
AV_BUFFER_FLAG_READONLY);
if (!frame->buf[1]) {
ret = AVERROR(ENOMEM);
goto copy_fail;
}
unmap_data->idx = cf->idx;
unmap_data->idx_ref = av_buffer_ref(cf->idx_ref);
unmap_data->decoder_ref = av_buffer_ref(cf->decoder_ref);
for (i = 0; frame->linesize[i]; i++) {
frame->data[i] = (uint8_t*)(devptr + offset);
frame->linesize[i] = pitch;
offset += pitch * (frame->height >> (i ? 1 : 0));
}
goto finish;
copy_fail:
decoder->cvdl->cuvidUnmapVideoFrame(decoder->decoder, devptr);
if (!frame->buf[1]) {
decoder->cvdl->cuvidUnmapVideoFrame(decoder->decoder, devptr);
av_freep(&unmap_data);
} else {
av_buffer_unref(&frame->buf[1]);
}
finish:
decoder->cudl->cuCtxPopCurrent(&dummy);
@ -521,6 +555,16 @@ int ff_nvdec_simple_decode_slice(AVCodecContext *avctx, const uint8_t *buffer,
return 0;
}
static void nvdec_free_dummy(struct AVHWFramesContext *ctx)
{
av_buffer_pool_uninit(&ctx->pool);
}
static AVBufferRef *nvdec_alloc_dummy(int size)
{
return av_buffer_create(NULL, 0, NULL, NULL, 0);
}
int ff_nvdec_frame_params(AVCodecContext *avctx,
AVBufferRef *hw_frames_ctx,
int dpb_size)
@ -550,6 +594,12 @@ int ff_nvdec_frame_params(AVCodecContext *avctx,
frames_ctx->height = (avctx->coded_height + 1) & ~1;
frames_ctx->initial_pool_size = dpb_size;
frames_ctx->free = nvdec_free_dummy;
frames_ctx->pool = av_buffer_pool_init(0, nvdec_alloc_dummy);
if (!frames_ctx->pool)
return AVERROR(ENOMEM);
switch (sw_desc->comp[0].depth) {
case 8:
frames_ctx->sw_format = AV_PIX_FMT_NV12;