mirror of
https://github.com/FFmpeg/FFmpeg.git
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b9129ec466
Some parts of the code are based on a patch by Timo Rothenpieler <timo@rothenpieler.org>
426 lines
12 KiB
C
426 lines
12 KiB
C
/*
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* HW decode acceleration through CUVID
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*
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* Copyright (c) 2016 Anton Khirnov
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <cuda.h>
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#include <cuviddec.h>
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#include "config.h"
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#include "libavutil/common.h"
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#include "libavutil/error.h"
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#include "libavutil/hwcontext.h"
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#include "libavutil/hwcontext_cuda.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/pixfmt.h"
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#include "avcodec.h"
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#include "decode.h"
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#include "cuvid.h"
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#include "internal.h"
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typedef struct CUVIDDecoder {
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CUvideodecoder decoder;
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AVBufferRef *hw_device_ref;
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CUcontext cuda_ctx;
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} CUVIDDecoder;
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typedef struct CUVIDFramePool {
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unsigned int dpb_size;
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unsigned int nb_allocated;
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} CUVIDFramePool;
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static int map_avcodec_id(enum AVCodecID id)
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{
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switch (id) {
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case AV_CODEC_ID_H264: return cudaVideoCodec_H264;
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}
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return -1;
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}
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static int map_chroma_format(enum AVPixelFormat pix_fmt)
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{
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int shift_h = 0, shift_v = 0;
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av_pix_fmt_get_chroma_sub_sample(pix_fmt, &shift_h, &shift_v);
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if (shift_h == 1 && shift_v == 1)
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return cudaVideoChromaFormat_420;
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else if (shift_h == 1 && shift_v == 0)
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return cudaVideoChromaFormat_422;
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else if (shift_h == 0 && shift_v == 0)
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return cudaVideoChromaFormat_444;
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return -1;
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}
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static void cuvid_decoder_free(void *opaque, uint8_t *data)
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{
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CUVIDDecoder *decoder = (CUVIDDecoder*)data;
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if (decoder->decoder)
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cuvidDestroyDecoder(decoder->decoder);
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av_buffer_unref(&decoder->hw_device_ref);
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av_freep(&decoder);
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}
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static int cuvid_decoder_create(AVBufferRef **out, AVBufferRef *hw_device_ref,
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CUVIDDECODECREATEINFO *params, void *logctx)
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{
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AVHWDeviceContext *hw_device_ctx = (AVHWDeviceContext*)hw_device_ref->data;
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AVCUDADeviceContext *device_hwctx = hw_device_ctx->hwctx;
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AVBufferRef *decoder_ref;
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CUVIDDecoder *decoder;
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CUcontext dummy;
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CUresult err;
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int ret;
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decoder = av_mallocz(sizeof(*decoder));
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if (!decoder)
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return AVERROR(ENOMEM);
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decoder_ref = av_buffer_create((uint8_t*)decoder, sizeof(*decoder),
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cuvid_decoder_free, NULL, AV_BUFFER_FLAG_READONLY);
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if (!decoder_ref) {
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av_freep(&decoder);
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return AVERROR(ENOMEM);
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}
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decoder->hw_device_ref = av_buffer_ref(hw_device_ref);
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if (!decoder->hw_device_ref) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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decoder->cuda_ctx = device_hwctx->cuda_ctx;
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err = cuCtxPushCurrent(decoder->cuda_ctx);
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if (err != CUDA_SUCCESS) {
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ret = AVERROR_UNKNOWN;
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goto fail;
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}
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err = cuvidCreateDecoder(&decoder->decoder, params);
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cuCtxPopCurrent(&dummy);
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if (err != CUDA_SUCCESS) {
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av_log(logctx, AV_LOG_ERROR, "Error creating a CUVID decoder: %d\n", err);
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ret = AVERROR_UNKNOWN;
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goto fail;
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}
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*out = decoder_ref;
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return 0;
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fail:
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av_buffer_unref(&decoder_ref);
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return ret;
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}
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static AVBufferRef *cuvid_decoder_frame_alloc(void *opaque, int size)
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{
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CUVIDFramePool *pool = opaque;
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AVBufferRef *ret;
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if (pool->nb_allocated >= pool->dpb_size)
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return NULL;
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ret = av_buffer_alloc(sizeof(unsigned int));
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if (!ret)
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return NULL;
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*(unsigned int*)ret->data = pool->nb_allocated++;
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return ret;
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}
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int ff_cuvid_decode_uninit(AVCodecContext *avctx)
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{
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CUVIDContext *ctx = avctx->internal->hwaccel_priv_data;
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av_freep(&ctx->bitstream);
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ctx->bitstream_len = 0;
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ctx->bitstream_allocated = 0;
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av_freep(&ctx->slice_offsets);
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ctx->nb_slices = 0;
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ctx->slice_offsets_allocated = 0;
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av_buffer_unref(&ctx->decoder_ref);
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av_buffer_pool_uninit(&ctx->decoder_pool);
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return 0;
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}
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int ff_cuvid_decode_init(AVCodecContext *avctx, unsigned int dpb_size)
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{
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CUVIDContext *ctx = avctx->internal->hwaccel_priv_data;
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CUVIDFramePool *pool;
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AVHWFramesContext *frames_ctx;
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const AVPixFmtDescriptor *sw_desc;
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CUVIDDECODECREATEINFO params = { 0 };
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int cuvid_codec_type, cuvid_chroma_format;
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int ret = 0;
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sw_desc = av_pix_fmt_desc_get(avctx->sw_pix_fmt);
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if (!sw_desc)
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return AVERROR_BUG;
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cuvid_codec_type = map_avcodec_id(avctx->codec_id);
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if (cuvid_codec_type < 0) {
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av_log(avctx, AV_LOG_ERROR, "Unsupported codec ID\n");
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return AVERROR_BUG;
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}
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cuvid_chroma_format = map_chroma_format(avctx->sw_pix_fmt);
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if (cuvid_chroma_format < 0) {
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av_log(avctx, AV_LOG_ERROR, "Unsupported chroma format\n");
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return AVERROR(ENOSYS);
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}
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if (avctx->thread_type & FF_THREAD_FRAME)
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dpb_size += avctx->thread_count;
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if (!avctx->hw_frames_ctx) {
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AVHWFramesContext *frames_ctx;
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if (!avctx->hw_device_ctx) {
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av_log(avctx, AV_LOG_ERROR, "A hardware device or frames context "
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"is required for CUVID decoding.\n");
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return AVERROR(EINVAL);
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}
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avctx->hw_frames_ctx = av_hwframe_ctx_alloc(avctx->hw_device_ctx);
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if (!avctx->hw_frames_ctx)
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return AVERROR(ENOMEM);
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frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
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frames_ctx->format = AV_PIX_FMT_CUDA;
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frames_ctx->width = avctx->coded_width;
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frames_ctx->height = avctx->coded_height;
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frames_ctx->sw_format = AV_PIX_FMT_NV12;
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frames_ctx->sw_format = sw_desc->comp[0].depth > 8 && HAVE_CUVIDDECODECREATEINFO_BITDEPTHMINUS8 ?
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AV_PIX_FMT_P010 : AV_PIX_FMT_NV12;
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frames_ctx->initial_pool_size = dpb_size;
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ret = av_hwframe_ctx_init(avctx->hw_frames_ctx);
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if (ret < 0) {
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av_log(avctx, AV_LOG_ERROR, "Error initializing internal frames context\n");
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return ret;
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}
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}
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frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
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params.ulWidth = avctx->coded_width;
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params.ulHeight = avctx->coded_height;
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params.ulTargetWidth = avctx->coded_width;
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params.ulTargetHeight = avctx->coded_height;
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#if HAVE_CUVIDDECODECREATEINFO_BITDEPTHMINUS8
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params.bitDepthMinus8 = sw_desc->comp[0].depth - 8;
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params.OutputFormat = params.bitDepthMinus8 ?
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cudaVideoSurfaceFormat_P016 : cudaVideoSurfaceFormat_NV12;
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#else
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params.OutputFormat = cudaVideoSurfaceFormat_NV12;
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#endif
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params.CodecType = cuvid_codec_type;
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params.ChromaFormat = cuvid_chroma_format;
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params.ulNumDecodeSurfaces = dpb_size;
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params.ulNumOutputSurfaces = 1;
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ret = cuvid_decoder_create(&ctx->decoder_ref, frames_ctx->device_ref, ¶ms, avctx);
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if (ret < 0)
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return ret;
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pool = av_mallocz(sizeof(*pool));
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if (!pool) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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pool->dpb_size = dpb_size;
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ctx->decoder_pool = av_buffer_pool_init2(sizeof(int), pool,
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cuvid_decoder_frame_alloc, av_free);
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if (!ctx->decoder_pool) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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return 0;
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fail:
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ff_cuvid_decode_uninit(avctx);
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return ret;
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}
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static void cuvid_fdd_priv_free(void *priv)
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{
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CUVIDFrame *cf = priv;
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if (!cf)
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return;
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av_buffer_unref(&cf->idx_ref);
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av_buffer_unref(&cf->decoder_ref);
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av_freep(&priv);
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}
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static int cuvid_retrieve_data(void *logctx, AVFrame *frame)
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{
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FrameDecodeData *fdd = (FrameDecodeData*)frame->opaque_ref->data;
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CUVIDFrame *cf = (CUVIDFrame*)fdd->hwaccel_priv;
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CUVIDDecoder *decoder = (CUVIDDecoder*)cf->decoder_ref->data;
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CUVIDPROCPARAMS vpp = { .progressive_frame = 1 };
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CUresult err;
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CUcontext dummy;
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CUdeviceptr devptr;
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unsigned int pitch, i;
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unsigned int offset = 0;
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int ret = 0;
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err = cuCtxPushCurrent(decoder->cuda_ctx);
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if (err != CUDA_SUCCESS)
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return AVERROR_UNKNOWN;
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err = cuvidMapVideoFrame(decoder->decoder, cf->idx, &devptr, &pitch, &vpp);
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if (err != CUDA_SUCCESS) {
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av_log(logctx, AV_LOG_ERROR, "Error mapping a picture with CUVID: %d\n",
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err);
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ret = AVERROR_UNKNOWN;
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goto finish;
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}
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for (i = 0; frame->data[i]; i++) {
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CUDA_MEMCPY2D cpy = {
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.srcMemoryType = CU_MEMORYTYPE_DEVICE,
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.dstMemoryType = CU_MEMORYTYPE_DEVICE,
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.srcDevice = devptr,
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.dstDevice = (CUdeviceptr)frame->data[i],
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.srcPitch = pitch,
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.dstPitch = frame->linesize[i],
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.srcY = offset,
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.WidthInBytes = FFMIN(pitch, frame->linesize[i]),
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.Height = frame->height >> (i ? 1 : 0),
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};
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err = cuMemcpy2D(&cpy);
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if (err != CUDA_SUCCESS) {
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av_log(logctx, AV_LOG_ERROR, "Error copying decoded frame: %d\n",
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err);
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ret = AVERROR_UNKNOWN;
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goto copy_fail;
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}
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offset += cpy.Height;
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}
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copy_fail:
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cuvidUnmapVideoFrame(decoder->decoder, devptr);
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finish:
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cuCtxPopCurrent(&dummy);
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return ret;
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}
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int ff_cuvid_start_frame(AVCodecContext *avctx, AVFrame *frame)
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{
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CUVIDContext *ctx = avctx->internal->hwaccel_priv_data;
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FrameDecodeData *fdd = (FrameDecodeData*)frame->opaque_ref->data;
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CUVIDFrame *cf = NULL;
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int ret;
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ctx->bitstream_len = 0;
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ctx->nb_slices = 0;
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if (fdd->hwaccel_priv)
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return 0;
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cf = av_mallocz(sizeof(*cf));
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if (!cf)
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return AVERROR(ENOMEM);
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cf->decoder_ref = av_buffer_ref(ctx->decoder_ref);
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if (!cf->decoder_ref)
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goto fail;
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cf->idx_ref = av_buffer_pool_get(ctx->decoder_pool);
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if (!cf->idx_ref) {
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av_log(avctx, AV_LOG_ERROR, "No decoder surfaces left\n");
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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cf->idx = *(unsigned int*)cf->idx_ref->data;
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fdd->hwaccel_priv = cf;
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fdd->hwaccel_priv_free = cuvid_fdd_priv_free;
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fdd->post_process = cuvid_retrieve_data;
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return 0;
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fail:
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cuvid_fdd_priv_free(cf);
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return ret;
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}
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int ff_cuvid_end_frame(AVCodecContext *avctx)
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{
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CUVIDContext *ctx = avctx->internal->hwaccel_priv_data;
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CUVIDDecoder *decoder = (CUVIDDecoder*)ctx->decoder_ref->data;
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CUVIDPICPARAMS *pp = &ctx->pic_params;
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CUresult err;
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CUcontext dummy;
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int ret = 0;
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pp->nBitstreamDataLen = ctx->bitstream_len;
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pp->pBitstreamData = ctx->bitstream;
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pp->nNumSlices = ctx->nb_slices;
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pp->pSliceDataOffsets = ctx->slice_offsets;
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err = cuCtxPushCurrent(decoder->cuda_ctx);
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if (err != CUDA_SUCCESS)
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return AVERROR_UNKNOWN;
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err = cuvidDecodePicture(decoder->decoder, &ctx->pic_params);
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if (err != CUDA_SUCCESS) {
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av_log(avctx, AV_LOG_ERROR, "Error decoding a picture with CUVID: %d\n",
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err);
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ret = AVERROR_UNKNOWN;
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goto finish;
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}
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finish:
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cuCtxPopCurrent(&dummy);
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return ret;
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}
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