| /* |
| * Copyright (c) 2017 Jun Zhao |
| * Copyright (c) 2017 Kaixuan Liu |
| * |
| * HW Acceleration API (video decoding) decode sample |
| * |
| * 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 |
| */ |
| |
| /** |
| * @file |
| * HW-Accelerated decoding example. |
| * |
| * @example hw_decode.c |
| * This example shows how to do HW-accelerated decoding with output |
| * frames from the HW video surfaces. |
| */ |
| |
| #include <stdio.h> |
| |
| #include <libavcodec/avcodec.h> |
| #include <libavformat/avformat.h> |
| #include <libavutil/pixdesc.h> |
| #include <libavutil/hwcontext.h> |
| #include <libavutil/opt.h> |
| #include <libavutil/avassert.h> |
| #include <libavutil/imgutils.h> |
| |
| static AVBufferRef *hw_device_ctx = NULL; |
| static enum AVPixelFormat hw_pix_fmt; |
| static FILE *output_file = NULL; |
| |
| static enum AVPixelFormat find_fmt_by_hw_type(const enum AVHWDeviceType type) |
| { |
| enum AVPixelFormat fmt; |
| |
| switch (type) { |
| case AV_HWDEVICE_TYPE_VAAPI: |
| fmt = AV_PIX_FMT_VAAPI; |
| break; |
| case AV_HWDEVICE_TYPE_DXVA2: |
| fmt = AV_PIX_FMT_DXVA2_VLD; |
| break; |
| case AV_HWDEVICE_TYPE_D3D11VA: |
| fmt = AV_PIX_FMT_D3D11; |
| break; |
| case AV_HWDEVICE_TYPE_VDPAU: |
| fmt = AV_PIX_FMT_VDPAU; |
| break; |
| case AV_HWDEVICE_TYPE_VIDEOTOOLBOX: |
| fmt = AV_PIX_FMT_VIDEOTOOLBOX; |
| break; |
| default: |
| fmt = AV_PIX_FMT_NONE; |
| break; |
| } |
| |
| return fmt; |
| } |
| |
| static int hw_decoder_init(AVCodecContext *ctx, const enum AVHWDeviceType type) |
| { |
| int err = 0; |
| |
| if ((err = av_hwdevice_ctx_create(&hw_device_ctx, type, |
| NULL, NULL, 0)) < 0) { |
| fprintf(stderr, "Failed to create specified HW device.\n"); |
| return err; |
| } |
| ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx); |
| |
| return err; |
| } |
| |
| static enum AVPixelFormat get_hw_format(AVCodecContext *ctx, |
| const enum AVPixelFormat *pix_fmts) |
| { |
| const enum AVPixelFormat *p; |
| |
| for (p = pix_fmts; *p != -1; p++) { |
| if (*p == hw_pix_fmt) |
| return *p; |
| } |
| |
| fprintf(stderr, "Failed to get HW surface format.\n"); |
| return AV_PIX_FMT_NONE; |
| } |
| |
| static int decode_write(AVCodecContext *avctx, AVPacket *packet) |
| { |
| AVFrame *frame = NULL, *sw_frame = NULL; |
| AVFrame *tmp_frame = NULL; |
| uint8_t *buffer = NULL; |
| int size; |
| int ret = 0; |
| |
| ret = avcodec_send_packet(avctx, packet); |
| if (ret < 0) { |
| fprintf(stderr, "Error during decoding\n"); |
| return ret; |
| } |
| |
| while (ret >= 0) { |
| if (!(frame = av_frame_alloc()) || !(sw_frame = av_frame_alloc())) { |
| fprintf(stderr, "Can not alloc frame\n"); |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| |
| ret = avcodec_receive_frame(avctx, frame); |
| if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) { |
| av_frame_free(&frame); |
| av_frame_free(&sw_frame); |
| return 0; |
| } else if (ret < 0) { |
| fprintf(stderr, "Error while decoding\n"); |
| goto fail; |
| } |
| |
| if (frame->format == hw_pix_fmt) { |
| /* retrieve data from GPU to CPU */ |
| if ((ret = av_hwframe_transfer_data(sw_frame, frame, 0)) < 0) { |
| fprintf(stderr, "Error transferring the data to system memory\n"); |
| goto fail; |
| } |
| tmp_frame = sw_frame; |
| } else |
| tmp_frame = frame; |
| |
| size = av_image_get_buffer_size(tmp_frame->format, tmp_frame->width, |
| tmp_frame->height, 1); |
| buffer = av_malloc(size); |
| if (!buffer) { |
| fprintf(stderr, "Can not alloc buffer\n"); |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| ret = av_image_copy_to_buffer(buffer, size, |
| (const uint8_t * const *)tmp_frame->data, |
| (const int *)tmp_frame->linesize, tmp_frame->format, |
| tmp_frame->width, tmp_frame->height, 1); |
| if (ret < 0) { |
| fprintf(stderr, "Can not copy image to buffer\n"); |
| goto fail; |
| } |
| |
| if ((ret = fwrite(buffer, 1, size, output_file)) < 0) { |
| fprintf(stderr, "Failed to dump raw data.\n"); |
| goto fail; |
| } |
| |
| fail: |
| av_frame_free(&frame); |
| av_frame_free(&sw_frame); |
| if (buffer) |
| av_freep(&buffer); |
| if (ret < 0) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| AVFormatContext *input_ctx = NULL; |
| int video_stream, ret; |
| AVStream *video = NULL; |
| AVCodecContext *decoder_ctx = NULL; |
| AVCodec *decoder = NULL; |
| AVPacket packet; |
| enum AVHWDeviceType type; |
| |
| if (argc < 4) { |
| fprintf(stderr, "Usage: %s <vaapi|vdpau|dxva2|d3d11va> <input file> <output file>\n", argv[0]); |
| return -1; |
| } |
| |
| av_register_all(); |
| |
| type = av_hwdevice_find_type_by_name(argv[1]); |
| hw_pix_fmt = find_fmt_by_hw_type(type); |
| if (hw_pix_fmt == -1) { |
| fprintf(stderr, "Cannot support '%s' in this example.\n", argv[1]); |
| return -1; |
| } |
| |
| /* open the input file */ |
| if (avformat_open_input(&input_ctx, argv[2], NULL, NULL) != 0) { |
| fprintf(stderr, "Cannot open input file '%s'\n", argv[2]); |
| return -1; |
| } |
| |
| if (avformat_find_stream_info(input_ctx, NULL) < 0) { |
| fprintf(stderr, "Cannot find input stream information.\n"); |
| return -1; |
| } |
| |
| /* find the video stream information */ |
| ret = av_find_best_stream(input_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &decoder, 0); |
| if (ret < 0) { |
| fprintf(stderr, "Cannot find a video stream in the input file\n"); |
| return -1; |
| } |
| video_stream = ret; |
| |
| if (!(decoder_ctx = avcodec_alloc_context3(decoder))) |
| return AVERROR(ENOMEM); |
| |
| video = input_ctx->streams[video_stream]; |
| if (avcodec_parameters_to_context(decoder_ctx, video->codecpar) < 0) |
| return -1; |
| |
| decoder_ctx->get_format = get_hw_format; |
| av_opt_set_int(decoder_ctx, "refcounted_frames", 1, 0); |
| |
| if (hw_decoder_init(decoder_ctx, type) < 0) |
| return -1; |
| |
| if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0) { |
| fprintf(stderr, "Failed to open codec for stream #%u\n", video_stream); |
| return -1; |
| } |
| |
| /* open the file to dump raw data */ |
| output_file = fopen(argv[3], "w+"); |
| |
| /* actual decoding and dump the raw data */ |
| while (ret >= 0) { |
| if ((ret = av_read_frame(input_ctx, &packet)) < 0) |
| break; |
| |
| if (video_stream == packet.stream_index) |
| ret = decode_write(decoder_ctx, &packet); |
| |
| av_packet_unref(&packet); |
| } |
| |
| /* flush the decoder */ |
| packet.data = NULL; |
| packet.size = 0; |
| ret = decode_write(decoder_ctx, &packet); |
| av_packet_unref(&packet); |
| |
| if (output_file) |
| fclose(output_file); |
| avcodec_free_context(&decoder_ctx); |
| avformat_close_input(&input_ctx); |
| av_buffer_unref(&hw_device_ctx); |
| |
| return 0; |
| } |