diff options
| -rwxr-xr-x | configure | 2 | ||||
| -rw-r--r-- | doc/Makefile | 1 | ||||
| -rw-r--r-- | doc/examples/Makefile | 1 | ||||
| -rw-r--r-- | doc/examples/hw_decode.c | 266 |
4 files changed, 270 insertions, 0 deletions
@@ -1468,6 +1468,7 @@ EXAMPLE_LIST=" filtering_audio_example filtering_video_example http_multiclient_example + hw_decode_example metadata_example muxing_example qsvdec_example @@ -3208,6 +3209,7 @@ filter_audio_example_deps="avfilter avutil" filtering_audio_example_deps="avfilter avcodec avformat avutil" filtering_video_example_deps="avfilter avcodec avformat avutil" http_multiclient_example_deps="avformat avutil fork" +hw_decode_example_deps="avcodec avformat avutil" metadata_example_deps="avformat avutil" muxing_example_deps="avcodec avformat avutil swscale" qsvdec_example_deps="avcodec avutil libmfx h264_qsv_decoder" diff --git a/doc/Makefile b/doc/Makefile index 4cc9eed..b670f0b 100644 --- a/doc/Makefile +++ b/doc/Makefile @@ -48,6 +48,7 @@ DOC_EXAMPLES-$(CONFIG_FILTER_AUDIO_EXAMPLE) += filter_audio DOC_EXAMPLES-$(CONFIG_FILTERING_AUDIO_EXAMPLE) += filtering_audio DOC_EXAMPLES-$(CONFIG_FILTERING_VIDEO_EXAMPLE) += filtering_video DOC_EXAMPLES-$(CONFIG_HTTP_MULTICLIENT_EXAMPLE) += http_multiclient +DOC_EXAMPLES-$(CONFIG_HW_DECODE_EXAMPLE) += hw_decode DOC_EXAMPLES-$(CONFIG_METADATA_EXAMPLE) += metadata DOC_EXAMPLES-$(CONFIG_MUXING_EXAMPLE) += muxing DOC_EXAMPLES-$(CONFIG_QSVDEC_EXAMPLE) += qsvdec diff --git a/doc/examples/Makefile b/doc/examples/Makefile index 2d0a306..6428154 100644 --- a/doc/examples/Makefile +++ b/doc/examples/Makefile @@ -22,6 +22,7 @@ EXAMPLES= avio_dir_cmd \ filtering_video \ filtering_audio \ http_multiclient \ + hw_decode \ metadata \ muxing \ remuxing \ diff --git a/doc/examples/hw_decode.c b/doc/examples/hw_decode.c new file mode 100644 index 0000000..9c7adbf --- /dev/null +++ b/doc/examples/hw_decode.c @@ -0,0 +1,266 @@ +/* + * 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; +} |
