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ffmpeg/libavcodec/cuvid.c

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/*
* HW decode acceleration through CUVID
*
* Copyright (c) 2016 Anton Khirnov
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <cuda.h>
#include <cuviddec.h>
#include "config.h"
#include "libavutil/common.h"
#include "libavutil/error.h"
#include "libavutil/hwcontext.h"
#include "libavutil/hwcontext_cuda.h"
#include "libavutil/pixdesc.h"
#include "libavutil/pixfmt.h"
#include "avcodec.h"
#include "decode.h"
#include "cuvid.h"
#include "internal.h"
typedef struct CUVIDDecoder {
CUvideodecoder decoder;
AVBufferRef *hw_device_ref;
CUcontext cuda_ctx;
} CUVIDDecoder;
typedef struct CUVIDFramePool {
unsigned int dpb_size;
unsigned int nb_allocated;
} CUVIDFramePool;
static int map_avcodec_id(enum AVCodecID id)
{
switch (id) {
case AV_CODEC_ID_H264: return cudaVideoCodec_H264;
case AV_CODEC_ID_HEVC: return cudaVideoCodec_HEVC;
}
return -1;
}
static int map_chroma_format(enum AVPixelFormat pix_fmt)
{
int shift_h = 0, shift_v = 0;
av_pix_fmt_get_chroma_sub_sample(pix_fmt, &shift_h, &shift_v);
if (shift_h == 1 && shift_v == 1)
return cudaVideoChromaFormat_420;
else if (shift_h == 1 && shift_v == 0)
return cudaVideoChromaFormat_422;
else if (shift_h == 0 && shift_v == 0)
return cudaVideoChromaFormat_444;
return -1;
}
static void cuvid_decoder_free(void *opaque, uint8_t *data)
{
CUVIDDecoder *decoder = (CUVIDDecoder*)data;
if (decoder->decoder)
cuvidDestroyDecoder(decoder->decoder);
av_buffer_unref(&decoder->hw_device_ref);
av_freep(&decoder);
}
static int cuvid_decoder_create(AVBufferRef **out, AVBufferRef *hw_device_ref,
CUVIDDECODECREATEINFO *params, void *logctx)
{
AVHWDeviceContext *hw_device_ctx = (AVHWDeviceContext*)hw_device_ref->data;
AVCUDADeviceContext *device_hwctx = hw_device_ctx->hwctx;
AVBufferRef *decoder_ref;
CUVIDDecoder *decoder;
CUcontext dummy;
CUresult err;
int ret;
decoder = av_mallocz(sizeof(*decoder));
if (!decoder)
return AVERROR(ENOMEM);
decoder_ref = av_buffer_create((uint8_t*)decoder, sizeof(*decoder),
cuvid_decoder_free, NULL, AV_BUFFER_FLAG_READONLY);
if (!decoder_ref) {
av_freep(&decoder);
return AVERROR(ENOMEM);
}
decoder->hw_device_ref = av_buffer_ref(hw_device_ref);
if (!decoder->hw_device_ref) {
ret = AVERROR(ENOMEM);
goto fail;
}
decoder->cuda_ctx = device_hwctx->cuda_ctx;
err = cuCtxPushCurrent(decoder->cuda_ctx);
if (err != CUDA_SUCCESS) {
ret = AVERROR_UNKNOWN;
goto fail;
}
err = cuvidCreateDecoder(&decoder->decoder, params);
cuCtxPopCurrent(&dummy);
if (err != CUDA_SUCCESS) {
av_log(logctx, AV_LOG_ERROR, "Error creating a CUVID decoder: %d\n", err);
ret = AVERROR_UNKNOWN;
goto fail;
}
*out = decoder_ref;
return 0;
fail:
av_buffer_unref(&decoder_ref);
return ret;
}
static AVBufferRef *cuvid_decoder_frame_alloc(void *opaque, int size)
{
CUVIDFramePool *pool = opaque;
AVBufferRef *ret;
if (pool->nb_allocated >= pool->dpb_size)
return NULL;
ret = av_buffer_alloc(sizeof(unsigned int));
if (!ret)
return NULL;
*(unsigned int*)ret->data = pool->nb_allocated++;
return ret;
}
int ff_cuvid_decode_uninit(AVCodecContext *avctx)
{
CUVIDContext *ctx = avctx->internal->hwaccel_priv_data;
av_freep(&ctx->bitstream);
ctx->bitstream_len = 0;
ctx->bitstream_allocated = 0;
av_freep(&ctx->slice_offsets);
ctx->nb_slices = 0;
ctx->slice_offsets_allocated = 0;
av_buffer_unref(&ctx->decoder_ref);
av_buffer_pool_uninit(&ctx->decoder_pool);
return 0;
}
int ff_cuvid_decode_init(AVCodecContext *avctx, unsigned int dpb_size)
{
CUVIDContext *ctx = avctx->internal->hwaccel_priv_data;
CUVIDFramePool *pool;
AVHWFramesContext *frames_ctx;
const AVPixFmtDescriptor *sw_desc;
CUVIDDECODECREATEINFO params = { 0 };
int cuvid_codec_type, cuvid_chroma_format;
int ret = 0;
sw_desc = av_pix_fmt_desc_get(avctx->sw_pix_fmt);
if (!sw_desc)
return AVERROR_BUG;
cuvid_codec_type = map_avcodec_id(avctx->codec_id);
if (cuvid_codec_type < 0) {
av_log(avctx, AV_LOG_ERROR, "Unsupported codec ID\n");
return AVERROR_BUG;
}
cuvid_chroma_format = map_chroma_format(avctx->sw_pix_fmt);
if (cuvid_chroma_format < 0) {
av_log(avctx, AV_LOG_ERROR, "Unsupported chroma format\n");
return AVERROR(ENOSYS);
}
if (avctx->thread_type & FF_THREAD_FRAME)
dpb_size += avctx->thread_count;
if (!avctx->hw_frames_ctx) {
AVHWFramesContext *frames_ctx;
if (!avctx->hw_device_ctx) {
av_log(avctx, AV_LOG_ERROR, "A hardware device or frames context "
"is required for CUVID decoding.\n");
return AVERROR(EINVAL);
}
avctx->hw_frames_ctx = av_hwframe_ctx_alloc(avctx->hw_device_ctx);
if (!avctx->hw_frames_ctx)
return AVERROR(ENOMEM);
frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
frames_ctx->format = AV_PIX_FMT_CUDA;
frames_ctx->width = avctx->coded_width;
frames_ctx->height = avctx->coded_height;
frames_ctx->sw_format = AV_PIX_FMT_NV12;
frames_ctx->sw_format = sw_desc->comp[0].depth > 8 && HAVE_CUVIDDECODECREATEINFO_BITDEPTHMINUS8 ?
AV_PIX_FMT_P010 : AV_PIX_FMT_NV12;
frames_ctx->initial_pool_size = dpb_size;
ret = av_hwframe_ctx_init(avctx->hw_frames_ctx);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error initializing internal frames context\n");
return ret;
}
}
frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
params.ulWidth = avctx->coded_width;
params.ulHeight = avctx->coded_height;
params.ulTargetWidth = avctx->coded_width;
params.ulTargetHeight = avctx->coded_height;
#if HAVE_CUVIDDECODECREATEINFO_BITDEPTHMINUS8
params.bitDepthMinus8 = sw_desc->comp[0].depth - 8;
params.OutputFormat = params.bitDepthMinus8 ?
cudaVideoSurfaceFormat_P016 : cudaVideoSurfaceFormat_NV12;
#else
params.OutputFormat = cudaVideoSurfaceFormat_NV12;
#endif
params.CodecType = cuvid_codec_type;
params.ChromaFormat = cuvid_chroma_format;
params.ulNumDecodeSurfaces = dpb_size;
params.ulNumOutputSurfaces = 1;
ret = cuvid_decoder_create(&ctx->decoder_ref, frames_ctx->device_ref, &params, avctx);
if (ret < 0)
return ret;
pool = av_mallocz(sizeof(*pool));
if (!pool) {
ret = AVERROR(ENOMEM);
goto fail;
}
pool->dpb_size = dpb_size;
ctx->decoder_pool = av_buffer_pool_init2(sizeof(int), pool,
cuvid_decoder_frame_alloc, av_free);
if (!ctx->decoder_pool) {
ret = AVERROR(ENOMEM);
goto fail;
}
return 0;
fail:
ff_cuvid_decode_uninit(avctx);
return ret;
}
static void cuvid_fdd_priv_free(void *priv)
{
CUVIDFrame *cf = priv;
if (!cf)
return;
av_buffer_unref(&cf->idx_ref);
av_buffer_unref(&cf->decoder_ref);
av_freep(&priv);
}
static int cuvid_retrieve_data(void *logctx, AVFrame *frame)
{
FrameDecodeData *fdd = (FrameDecodeData*)frame->opaque_ref->data;
CUVIDFrame *cf = (CUVIDFrame*)fdd->hwaccel_priv;
CUVIDDecoder *decoder = (CUVIDDecoder*)cf->decoder_ref->data;
CUVIDPROCPARAMS vpp = { .progressive_frame = 1 };
CUresult err;
CUcontext dummy;
CUdeviceptr devptr;
unsigned int pitch, i;
unsigned int offset = 0;
int ret = 0;
err = cuCtxPushCurrent(decoder->cuda_ctx);
if (err != CUDA_SUCCESS)
return AVERROR_UNKNOWN;
err = cuvidMapVideoFrame(decoder->decoder, cf->idx, &devptr, &pitch, &vpp);
if (err != CUDA_SUCCESS) {
av_log(logctx, AV_LOG_ERROR, "Error mapping a picture with CUVID: %d\n",
err);
ret = AVERROR_UNKNOWN;
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 = 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;
}
copy_fail:
cuvidUnmapVideoFrame(decoder->decoder, devptr);
finish:
cuCtxPopCurrent(&dummy);
return ret;
}
int ff_cuvid_start_frame(AVCodecContext *avctx, AVFrame *frame)
{
CUVIDContext *ctx = avctx->internal->hwaccel_priv_data;
FrameDecodeData *fdd = (FrameDecodeData*)frame->opaque_ref->data;
CUVIDFrame *cf = NULL;
int ret;
ctx->bitstream_len = 0;
ctx->nb_slices = 0;
if (fdd->hwaccel_priv)
return 0;
cf = av_mallocz(sizeof(*cf));
if (!cf)
return AVERROR(ENOMEM);
cf->decoder_ref = av_buffer_ref(ctx->decoder_ref);
if (!cf->decoder_ref)
goto fail;
cf->idx_ref = av_buffer_pool_get(ctx->decoder_pool);
if (!cf->idx_ref) {
av_log(avctx, AV_LOG_ERROR, "No decoder surfaces left\n");
ret = AVERROR(ENOMEM);
goto fail;
}
cf->idx = *(unsigned int*)cf->idx_ref->data;
fdd->hwaccel_priv = cf;
fdd->hwaccel_priv_free = cuvid_fdd_priv_free;
fdd->post_process = cuvid_retrieve_data;
return 0;
fail:
cuvid_fdd_priv_free(cf);
return ret;
}
int ff_cuvid_end_frame(AVCodecContext *avctx)
{
CUVIDContext *ctx = avctx->internal->hwaccel_priv_data;
CUVIDDecoder *decoder = (CUVIDDecoder*)ctx->decoder_ref->data;
CUVIDPICPARAMS *pp = &ctx->pic_params;
CUresult err;
CUcontext dummy;
int ret = 0;
pp->nBitstreamDataLen = ctx->bitstream_len;
pp->pBitstreamData = ctx->bitstream;
pp->nNumSlices = ctx->nb_slices;
pp->pSliceDataOffsets = ctx->slice_offsets;
err = cuCtxPushCurrent(decoder->cuda_ctx);
if (err != CUDA_SUCCESS)
return AVERROR_UNKNOWN;
err = cuvidDecodePicture(decoder->decoder, &ctx->pic_params);
if (err != CUDA_SUCCESS) {
av_log(avctx, AV_LOG_ERROR, "Error decoding a picture with CUVID: %d\n",
err);
ret = AVERROR_UNKNOWN;
goto finish;
}
finish:
cuCtxPopCurrent(&dummy);
return ret;
}
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