On Tue, 21 Mar 2017 12:45:26 +0800 Jun Zhao <mypopy...@gmail.com> wrote:
> From 6b56c541ed7dd271ad0aa6eb6412a8427f009525 Mon Sep 17 00:00:00 2001 > From: Jun Zhao <jun.z...@intel.com> > Date: Tue, 21 Mar 2017 11:04:41 +0800 > Subject: [PATCH] examples/vaapi_dec: Add a VA-API hwaccel decoding example. > > Add a VA-API hwaccel decoding example. > > Signed-off-by: Liu, Kaixuan <kaixuan....@intel.com> > Signed-off-by: Jun Zhao <jun.z...@intel.com> > --- > doc/examples/vaapi_dec.c | 346 > +++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 346 insertions(+) > create mode 100644 doc/examples/vaapi_dec.c > > diff --git a/doc/examples/vaapi_dec.c b/doc/examples/vaapi_dec.c > new file mode 100644 > index 0000000..f975d86 > --- /dev/null > +++ b/doc/examples/vaapi_dec.c > @@ -0,0 +1,346 @@ > +/* > + * Video 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 > + * Intel VAAPI-accelerated decoding example. > + * > + * @example vaapi_dec.c > + * This example shows how to do VAAPI-accelerated decoding with output > + * frames from the VAAPI video surfaces. > + */ > + > +#include <stdio.h> > +#include <libavcodec/avcodec.h> > +#include <libavcodec/vaapi.h> > +#include <libavformat/avformat.h> > +#include <libswscale/swscale.h> > +#include <libavutil/pixdesc.h> > +#include <libavutil/hwcontext.h> > +#include <libavutil/opt.h> > +#include <libavutil/hwcontext_vaapi.h> > +#include <libavutil/avassert.h> > +#include <va/va.h> > +#include <va/va_x11.h> > +#include <va/va_drm.h> > + > +#define DEFAULT_SURFACES 20 > +static enum AVPixelFormat decode_format = AV_PIX_FMT_NV12; > +static enum AVPixelFormat output_format = AV_PIX_FMT_NV12; /* default output > format nv12 */ > +static AVBufferRef *frames_ref = NULL; > +static AVBufferRef *device_ref = NULL; > +FILE *output_file = NULL; > + > +void decoder_uninit_vaapi(AVCodecContext *avctx, AVVAAPIDeviceContext *hwctx) > +{ > + if (hwctx) { > + av_buffer_unref(&frames_ref); > + av_buffer_unref(&device_ref); > + } > + return; > +} > + > +int decoder_init_vaapi(AVCodecContext *ctx) > +{ > + AVBufferRef *hw_device_ctx = NULL; > + AVHWFramesContext *frames; > + int err = 0; > + char *dev_name = "/dev/dri/renderD128"; > + AVBufferRef *device_ref = NULL; > + AVHWDeviceContext *device = NULL; > + AVVAAPIDeviceContext *hwctx = NULL; > + > + if ((err = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_VAAPI, > + dev_name, NULL, 0)) < 0) { > + fprintf(stderr, "Failed to create a VAAPI device.\n"); > + return err; > + } > + > + device_ref = av_buffer_ref(hw_device_ctx); > + device = (AVHWDeviceContext *)device_ref->data; > + hwctx = (AVVAAPIDeviceContext *)device->hwctx; > + > + ctx->pix_fmt = output_format; > + if (!(frames_ref = av_hwframe_ctx_alloc(device_ref))) { > + fprintf(stderr, "Failed to create VAAPI frame context.\n"); > + err = AVERROR(ENOMEM); > + goto fail; > + } > + frames = (AVHWFramesContext *)frames_ref->data; > + frames->format = AV_PIX_FMT_VAAPI; > + frames->sw_format = decode_format; > + frames->width = ctx->coded_width; > + frames->height = ctx->coded_height; > + frames->initial_pool_size = DEFAULT_SURFACES; > + if ((err = av_hwframe_ctx_init(frames_ref)) < 0) { > + fprintf(stderr, "Failed to initialize VAAPI frame.\n"); > + goto fail; > + } > + > + ctx->hw_frames_ctx = av_buffer_ref(frames_ref); > + if (!ctx->hw_frames_ctx) { > + err = AVERROR(ENOMEM); > + fprintf(stderr, "Failed to ref VAAPI frame.\n"); > + goto fail; > + } All of this code (except device creation) will be unnecessary once the Libav change of improving the hw decoding API has been merged. See e.g.: https://git.libav.org/?p=libav.git;a=commit;h=62a1ef9f26c654a3e988aa465c4ac1d776c4c356 > + > +fail: > + if (err < 0) > + decoder_uninit_vaapi(ctx, hwctx); > + return err; > +} > + > +static enum AVPixelFormat get_hw_vaapi_format(AVCodecContext *ctx, > + const enum AVPixelFormat > *pix_fmts) > +{ > + const enum AVPixelFormat *p; > + int ret; > + > + for (p = pix_fmts; *p != -1; p++) { > + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(*p); > + if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL)) > + break; > + > + if (!(strstr(desc->name, "vaapi"))) > + continue; > + > + if ((ret = decoder_init_vaapi(ctx)) < 0) { > + fprintf(stderr, "hwaccel for decoder(VAAPI) cannot be > initialized.\n"); > + return AV_PIX_FMT_NONE; > + } > + break; > + } > + return *p; > +} > + > +static int get_hw_vaapi_buffer(AVCodecContext *ctx, AVFrame *frame, int > flags) > +{ > + int err; > + if ((err = av_hwframe_get_buffer(frames_ref, frame, 0)) < 0) > + av_log(NULL, AV_LOG_ERROR, "Failed to allocate decoder surface.\n"); > + > + return err; > +} This function will also be unnecessary. > + > +int retrieve_data(AVFrame *input) > +{ > + AVFrame *output = 0; > + int err; > + av_assert0(input->format == AV_PIX_FMT_VAAPI); > + > + if (output_format == AV_PIX_FMT_VAAPI) > + return 0; Not necessary to check the pixfmt. As long as the AVFrame has a hw_frames_ctx set, it should work. (Even if not, the transfer data function would just return AVERROR(ENOSYS).) > + > + if (!(output = av_frame_alloc())) > + return AVERROR(ENOMEM); > + output->format = output_format; > + if ((err = av_hwframe_transfer_data(output, input, 0)) < 0) { > + fprintf(stderr, "Failed to transfer data to output frame: %d.\n", > err); > + goto fail; > + } > + > + if ((err = av_frame_copy_props(output, input)) < 0) { > + av_frame_unref(output); > + goto fail; > + } > + > + av_frame_unref(input); > + av_frame_move_ref(input, output); > + av_frame_free(&output); > + return 0; > + > +fail: > + av_frame_free(&output); > + return err; > +} > + > +int write_frame(AVFrame *frame) > +{ > + int idx, size; > + int width = frame->width; > + int height = frame->height; > + > + av_assert0(frame && frame->data[0] && output_file); > + > + for (idx = 0; idx < height; idx++) { > + if ((size = fwrite(frame->data[0] + idx*frame->linesize[0], > + 1, width, output_file)) < 0) { > + fprintf(stderr, "Dump Y to file error.\n"); > + return -1; > + } > + } > + > + height >>= 1; > + for (idx = 0; idx < height; idx++) { > + if ((size = fwrite(frame->data[1] + idx*frame->linesize[1], > + 1, width, output_file)) < 0) { > + fprintf(stderr, "Dump UV to file error.\n"); > + return -1; > + } > + } > + > + return 0; > +} > + > +int decode_write(AVCodecContext *avctx, AVPacket packet, int flush) > +{ > + AVFrame *frame = NULL; > + int ret = 0, got_frame = 0; > + > + if (!(frame = av_frame_alloc())) > + return AVERROR(ENOMEM); > + > + if ((ret = avcodec_decode_video2(avctx, frame, &got_frame, &packet)) < > 0) { > + fprintf(stderr, "Error during decoding\n"); > + goto fail; > + } Deprecated API use. > + > + if (got_frame) { > + if (AV_PIX_FMT_VAAPI == frame->format) { I think we want to avoid "yoda conditions" in this project. > + /* retrieve data from GPU to CPU */ > + if ((ret = retrieve_data(frame)) < 0) > + goto fail; > + > + if ((ret = write_frame(frame)) < 0) > + goto fail; > + } > + } else if (flush == 1) { > + ret = -1; > + } > + > +fail: > + av_frame_free(&frame); > + return ret; > +} > + > +/* flush the decoder */ > +int flush(AVCodecContext *avctx) > +{ > + AVPacket packet; > + int ret = 0; > + > + av_init_packet(&packet); > + packet.data = NULL; > + packet.size = 0; > + > + while (1) { > + if ((ret = decode_write(avctx, packet, 1)) < 0) > + break; > + } > + av_packet_unref(&packet); > + > + return 0; > +} > + > +int main(int argc, char *argv[]) > +{ > + AVFormatContext *input_ctx = NULL; > + int i,video_stream,ret; > + AVCodecContext *decoder_ctx = NULL; > + AVCodec *decoder = NULL; > + AVPacket packet; > + > + if (argc < 3) { > + fprintf(stderr, "Usage: %s <input file> <output file>\n", argv[0]); > + return -1; > + } > + > + av_register_all(); > + > + /* open the input file */ > + if (avformat_open_input(&input_ctx, argv[1], NULL, NULL) != 0) { > + fprintf(stderr, "Cannot open input file '%s'\n", argv[1]); > + return -1; > + } > + > + if (avformat_find_stream_info(input_ctx, NULL) < 0) { > + fprintf(stderr, "Couldn't find input stream information.\n"); > + return -1; > + } > + > + /* find the video stream information */ > + video_stream = -1; > + for (i = 0; i < input_ctx->nb_streams; i++) { > + AVStream *st = input_ctx->streams[i]; > + if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) { > + /* NOTE: just handle the first video stream */ > + video_stream = i; > + break; > + } > + } > + > + if (video_stream == -1) { > + fprintf(stderr, "No find a video stream in the input file.\n"); > + return -1; > + } > + > + /* initialize the video decoder */ > + if (!(decoder = > avcodec_find_decoder(input_ctx->streams[video_stream]->codecpar->codec_id))) { > + fprintf(stderr, "Could not find input codec\n"); > + avformat_close_input(&input_ctx); > + return -1; > + } > + > + if (!(decoder_ctx = avcodec_alloc_context3(decoder))) > + return AVERROR(ENOMEM); > + > + if (avcodec_parameters_to_context(decoder_ctx, > + > input_ctx->streams[video_stream]->codecpar) < 0) { > + avcodec_free_context(&decoder_ctx); > + avformat_close_input(&input_ctx); > + return -1; > + } > + > + decoder_ctx->get_format = get_hw_vaapi_format; > + decoder_ctx->get_buffer2 = get_hw_vaapi_buffer; > + av_opt_set_int(decoder_ctx, "refcounted_frames", 1, 0); > + > + if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0) { > + fprintf(stderr, "Failed to open codec for stream #%u\n", i); > + return ret; > + } > + > + /* open the output file to dump YUV */ > + output_file = fopen(argv[2], "w+"); > + > + /* actual decoding and dump the YUV data */ > + while (av_read_frame(input_ctx, &packet) >= 0) { > + if (video_stream == packet.stream_index) > + ret = decode_write(decoder_ctx, packet, 0); > + av_packet_unref(&packet); > + > + if (ret < 0) > + break; > + } > + > + /* flush the decoder */ > + flush(decoder_ctx); > + > + if (output_file) > + fclose(output_file); > + avcodec_free_context(&decoder_ctx); > + avformat_close_input(&input_ctx); > + > + av_buffer_unref(&frames_ref); > + av_buffer_unref(&device_ref); > + > + return ret; > +} > + Rest seems ok. _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel