| /* |
| * Copyright (c) 2015 Anton Khirnov |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| /** |
| * @file |
| * Intel QSV-accelerated H.264 decoding example. |
| * |
| * @example qsvdec.c |
| * This example shows how to do QSV-accelerated H.264 decoding with output |
| * frames in the GPU video surfaces. |
| */ |
| |
| #include "config.h" |
| |
| #include <stdio.h> |
| |
| #include "libavformat/avformat.h" |
| #include "libavformat/avio.h" |
| |
| #include "libavcodec/avcodec.h" |
| |
| #include "libavutil/buffer.h" |
| #include "libavutil/error.h" |
| #include "libavutil/hwcontext.h" |
| #include "libavutil/hwcontext_qsv.h" |
| #include "libavutil/mem.h" |
| |
| typedef struct DecodeContext { |
| AVBufferRef *hw_device_ref; |
| } DecodeContext; |
| |
| static int get_format(AVCodecContext *avctx, const enum AVPixelFormat *pix_fmts) |
| { |
| while (*pix_fmts != AV_PIX_FMT_NONE) { |
| if (*pix_fmts == AV_PIX_FMT_QSV) { |
| DecodeContext *decode = avctx->opaque; |
| AVHWFramesContext *frames_ctx; |
| AVQSVFramesContext *frames_hwctx; |
| int ret; |
| |
| /* create a pool of surfaces to be used by the decoder */ |
| avctx->hw_frames_ctx = av_hwframe_ctx_alloc(decode->hw_device_ref); |
| if (!avctx->hw_frames_ctx) |
| return AV_PIX_FMT_NONE; |
| frames_ctx = (AVHWFramesContext*)avctx->hw_frames_ctx->data; |
| frames_hwctx = frames_ctx->hwctx; |
| |
| frames_ctx->format = AV_PIX_FMT_QSV; |
| frames_ctx->sw_format = avctx->sw_pix_fmt; |
| frames_ctx->width = FFALIGN(avctx->coded_width, 32); |
| frames_ctx->height = FFALIGN(avctx->coded_height, 32); |
| frames_ctx->initial_pool_size = 32; |
| |
| frames_hwctx->frame_type = MFX_MEMTYPE_VIDEO_MEMORY_DECODER_TARGET; |
| |
| ret = av_hwframe_ctx_init(avctx->hw_frames_ctx); |
| if (ret < 0) |
| return AV_PIX_FMT_NONE; |
| |
| return AV_PIX_FMT_QSV; |
| } |
| |
| pix_fmts++; |
| } |
| |
| fprintf(stderr, "The QSV pixel format not offered in get_format()\n"); |
| |
| return AV_PIX_FMT_NONE; |
| } |
| |
| static int decode_packet(DecodeContext *decode, AVCodecContext *decoder_ctx, |
| AVFrame *frame, AVFrame *sw_frame, |
| AVPacket *pkt, AVIOContext *output_ctx) |
| { |
| int ret = 0; |
| |
| ret = avcodec_send_packet(decoder_ctx, pkt); |
| if (ret < 0) { |
| fprintf(stderr, "Error during decoding\n"); |
| return ret; |
| } |
| |
| while (ret >= 0) { |
| int i, j; |
| |
| ret = avcodec_receive_frame(decoder_ctx, frame); |
| if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) |
| break; |
| else if (ret < 0) { |
| fprintf(stderr, "Error during decoding\n"); |
| return ret; |
| } |
| |
| /* A real program would do something useful with the decoded frame here. |
| * We just retrieve the raw data and write it to a file, which is rather |
| * useless but pedagogic. */ |
| ret = av_hwframe_transfer_data(sw_frame, frame, 0); |
| if (ret < 0) { |
| fprintf(stderr, "Error transferring the data to system memory\n"); |
| goto fail; |
| } |
| |
| for (i = 0; i < FF_ARRAY_ELEMS(sw_frame->data) && sw_frame->data[i]; i++) |
| for (j = 0; j < (sw_frame->height >> (i > 0)); j++) |
| avio_write(output_ctx, sw_frame->data[i] + j * sw_frame->linesize[i], sw_frame->width); |
| |
| fail: |
| av_frame_unref(sw_frame); |
| av_frame_unref(frame); |
| |
| if (ret < 0) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| int main(int argc, char **argv) |
| { |
| AVFormatContext *input_ctx = NULL; |
| AVStream *video_st = NULL; |
| AVCodecContext *decoder_ctx = NULL; |
| const AVCodec *decoder; |
| |
| AVPacket pkt = { 0 }; |
| AVFrame *frame = NULL, *sw_frame = NULL; |
| |
| DecodeContext decode = { NULL }; |
| |
| AVIOContext *output_ctx = NULL; |
| |
| int ret, i; |
| |
| if (argc < 3) { |
| fprintf(stderr, "Usage: %s <input file> <output file>\n", argv[0]); |
| return 1; |
| } |
| |
| /* open the input file */ |
| ret = avformat_open_input(&input_ctx, argv[1], NULL, NULL); |
| if (ret < 0) { |
| fprintf(stderr, "Cannot open input file '%s': ", argv[1]); |
| goto finish; |
| } |
| |
| /* find the first H.264 video stream */ |
| for (i = 0; i < input_ctx->nb_streams; i++) { |
| AVStream *st = input_ctx->streams[i]; |
| |
| if (st->codecpar->codec_id == AV_CODEC_ID_H264 && !video_st) |
| video_st = st; |
| else |
| st->discard = AVDISCARD_ALL; |
| } |
| if (!video_st) { |
| fprintf(stderr, "No H.264 video stream in the input file\n"); |
| goto finish; |
| } |
| |
| /* open the hardware device */ |
| ret = av_hwdevice_ctx_create(&decode.hw_device_ref, AV_HWDEVICE_TYPE_QSV, |
| "auto", NULL, 0); |
| if (ret < 0) { |
| fprintf(stderr, "Cannot open the hardware device\n"); |
| goto finish; |
| } |
| |
| /* initialize the decoder */ |
| decoder = avcodec_find_decoder_by_name("h264_qsv"); |
| if (!decoder) { |
| fprintf(stderr, "The QSV decoder is not present in libavcodec\n"); |
| goto finish; |
| } |
| |
| decoder_ctx = avcodec_alloc_context3(decoder); |
| if (!decoder_ctx) { |
| ret = AVERROR(ENOMEM); |
| goto finish; |
| } |
| decoder_ctx->codec_id = AV_CODEC_ID_H264; |
| if (video_st->codecpar->extradata_size) { |
| decoder_ctx->extradata = av_mallocz(video_st->codecpar->extradata_size + |
| AV_INPUT_BUFFER_PADDING_SIZE); |
| if (!decoder_ctx->extradata) { |
| ret = AVERROR(ENOMEM); |
| goto finish; |
| } |
| memcpy(decoder_ctx->extradata, video_st->codecpar->extradata, |
| video_st->codecpar->extradata_size); |
| decoder_ctx->extradata_size = video_st->codecpar->extradata_size; |
| } |
| |
| decoder_ctx->opaque = &decode; |
| decoder_ctx->get_format = get_format; |
| |
| ret = avcodec_open2(decoder_ctx, NULL, NULL); |
| if (ret < 0) { |
| fprintf(stderr, "Error opening the decoder: "); |
| goto finish; |
| } |
| |
| /* open the output stream */ |
| ret = avio_open(&output_ctx, argv[2], AVIO_FLAG_WRITE); |
| if (ret < 0) { |
| fprintf(stderr, "Error opening the output context: "); |
| goto finish; |
| } |
| |
| frame = av_frame_alloc(); |
| sw_frame = av_frame_alloc(); |
| if (!frame || !sw_frame) { |
| ret = AVERROR(ENOMEM); |
| goto finish; |
| } |
| |
| /* actual decoding */ |
| while (ret >= 0) { |
| ret = av_read_frame(input_ctx, &pkt); |
| if (ret < 0) |
| break; |
| |
| if (pkt.stream_index == video_st->index) |
| ret = decode_packet(&decode, decoder_ctx, frame, sw_frame, &pkt, output_ctx); |
| |
| av_packet_unref(&pkt); |
| } |
| |
| /* flush the decoder */ |
| pkt.data = NULL; |
| pkt.size = 0; |
| ret = decode_packet(&decode, decoder_ctx, frame, sw_frame, &pkt, output_ctx); |
| |
| finish: |
| if (ret < 0) { |
| char buf[1024]; |
| av_strerror(ret, buf, sizeof(buf)); |
| fprintf(stderr, "%s\n", buf); |
| } |
| |
| avformat_close_input(&input_ctx); |
| |
| av_frame_free(&frame); |
| av_frame_free(&sw_frame); |
| |
| avcodec_free_context(&decoder_ctx); |
| |
| av_buffer_unref(&decode.hw_device_ref); |
| |
| avio_close(output_ctx); |
| |
| return ret; |
| } |