/* * HW decode acceleration through NVDEC * * Copyright (c) 2016 Anton Khirnov * * This file is part of FFmpeg. * * FFmpeg 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. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "config.h" #include "libavutil/common.h" #include "libavutil/error.h" #include "libavutil/hwcontext.h" #include "libavutil/hwcontext_cuda_internal.h" #include "libavutil/pixdesc.h" #include "libavutil/pixfmt.h" #include "avcodec.h" #include "decode.h" #include "nvdec.h" #include "internal.h" typedef struct NVDECDecoder { CUvideodecoder decoder; AVBufferRef *hw_device_ref; CUcontext cuda_ctx; CudaFunctions *cudl; CuvidFunctions *cvdl; } NVDECDecoder; typedef struct NVDECFramePool { unsigned int dpb_size; unsigned int nb_allocated; } NVDECFramePool; 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 nvdec_decoder_free(void *opaque, uint8_t *data) { NVDECDecoder *decoder = (NVDECDecoder*)data; if (decoder->decoder) decoder->cvdl->cuvidDestroyDecoder(decoder->decoder); av_buffer_unref(&decoder->hw_device_ref); cuvid_free_functions(&decoder->cvdl); av_freep(&decoder); } static int nvdec_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; NVDECDecoder *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), nvdec_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; decoder->cudl = device_hwctx->internal->cuda_dl; ret = cuvid_load_functions(&decoder->cvdl); if (ret < 0) { av_log(logctx, AV_LOG_ERROR, "Failed loading nvcuvid.\n"); goto fail; } err = decoder->cudl->cuCtxPushCurrent(decoder->cuda_ctx); if (err != CUDA_SUCCESS) { ret = AVERROR_UNKNOWN; goto fail; } err = decoder->cvdl->cuvidCreateDecoder(&decoder->decoder, params); decoder->cudl->cuCtxPopCurrent(&dummy); if (err != CUDA_SUCCESS) { av_log(logctx, AV_LOG_ERROR, "Error creating a NVDEC decoder: %d\n", err); ret = AVERROR_UNKNOWN; goto fail; } *out = decoder_ref; return 0; fail: av_buffer_unref(&decoder_ref); return ret; } static AVBufferRef *nvdec_decoder_frame_alloc(void *opaque, int size) { NVDECFramePool *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_nvdec_decode_uninit(AVCodecContext *avctx) { NVDECContext *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_nvdec_decode_init(AVCodecContext *avctx, unsigned int dpb_size) { NVDECContext *ctx = avctx->internal->hwaccel_priv_data; NVDECFramePool *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 ? 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; params.bitDepthMinus8 = sw_desc->comp[0].depth - 8; params.OutputFormat = params.bitDepthMinus8 ? cudaVideoSurfaceFormat_P016 : cudaVideoSurfaceFormat_NV12; params.CodecType = cuvid_codec_type; params.ChromaFormat = cuvid_chroma_format; params.ulNumDecodeSurfaces = dpb_size; params.ulNumOutputSurfaces = 1; ret = nvdec_decoder_create(&ctx->decoder_ref, frames_ctx->device_ref, ¶ms, 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, nvdec_decoder_frame_alloc, av_free); if (!ctx->decoder_pool) { ret = AVERROR(ENOMEM); goto fail; } return 0; fail: ff_nvdec_decode_uninit(avctx); return ret; } static void nvdec_fdd_priv_free(void *priv) { NVDECFrame *cf = priv; if (!cf) return; av_buffer_unref(&cf->idx_ref); av_buffer_unref(&cf->decoder_ref); av_freep(&priv); } static int nvdec_retrieve_data(void *logctx, AVFrame *frame) { FrameDecodeData *fdd = (FrameDecodeData*)frame->private_ref->data; NVDECFrame *cf = (NVDECFrame*)fdd->hwaccel_priv; NVDECDecoder *decoder = (NVDECDecoder*)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 = decoder->cudl->cuCtxPushCurrent(decoder->cuda_ctx); if (err != CUDA_SUCCESS) return AVERROR_UNKNOWN; err = decoder->cvdl->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 = 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; } copy_fail: decoder->cvdl->cuvidUnmapVideoFrame(decoder->decoder, devptr); finish: decoder->cudl->cuCtxPopCurrent(&dummy); return ret; } int ff_nvdec_start_frame(AVCodecContext *avctx, AVFrame *frame) { NVDECContext *ctx = avctx->internal->hwaccel_priv_data; FrameDecodeData *fdd = (FrameDecodeData*)frame->private_ref->data; NVDECFrame *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 = nvdec_fdd_priv_free; fdd->post_process = nvdec_retrieve_data; return 0; fail: nvdec_fdd_priv_free(cf); return ret; } int ff_nvdec_end_frame(AVCodecContext *avctx) { NVDECContext *ctx = avctx->internal->hwaccel_priv_data; NVDECDecoder *decoder = (NVDECDecoder*)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 = decoder->cudl->cuCtxPushCurrent(decoder->cuda_ctx); if (err != CUDA_SUCCESS) return AVERROR_UNKNOWN; err = decoder->cvdl->cuvidDecodePicture(decoder->decoder, &ctx->pic_params); if (err != CUDA_SUCCESS) { av_log(avctx, AV_LOG_ERROR, "Error decoding a picture with NVDEC: %d\n", err); ret = AVERROR_UNKNOWN; goto finish; } finish: decoder->cudl->cuCtxPopCurrent(&dummy); return ret; }