On Mon, Jun 11, 2018 at 7:22 PM Jun Zhao <mypopy...@gmail.com> wrote:
>
> add a vaapi decoding/scaling sample.
>
> Signed-off-by: Jun Zhao <mypopy...@gmail.com>
> ---
> configure | 2 +
> doc/examples/Makefile | 1 +
> doc/examples/vaapi_dec_scaling.c | 375
+++++++++++++++++++++++++++++++++++++++
> 3 files changed, 378 insertions(+)
> create mode 100644 doc/examples/vaapi_dec_scaling.c
>
> diff --git a/configure b/configure
> index 473be31..d28dc37 100755
> --- a/configure
> +++ b/configure
> @@ -1610,6 +1610,7 @@ EXAMPLE_LIST="
> scaling_video_example
> transcode_aac_example
> transcoding_example
> + vaapi_dec_scaling_example
> vaapi_encode_example
> vaapi_transcode_example
> "
> @@ -3445,6 +3446,7 @@ resampling_audio_example_deps="avutil swresample"
> scaling_video_example_deps="avutil swscale"
> transcode_aac_example_deps="avcodec avformat swresample"
> transcoding_example_deps="avfilter avcodec avformat avutil"
> +vaapi_dec_scaling_example_deps="avfilter avcodec avformat avutil"
> vaapi_encode_example_deps="avcodec avutil h264_vaapi_encoder"
> vaapi_transcode_example_deps="avcodec avformat avutil h264_vaapi_encoder"
>
> diff --git a/doc/examples/Makefile b/doc/examples/Makefile
> index 928ff30..3ea6899 100644
> --- a/doc/examples/Makefile
> +++ b/doc/examples/Makefile
> @@ -19,6 +19,7 @@ EXAMPLES-$(CONFIG_RESAMPLING_AUDIO_EXAMPLE) +=
resampling_audio
> EXAMPLES-$(CONFIG_SCALING_VIDEO_EXAMPLE) += scaling_video
> EXAMPLES-$(CONFIG_TRANSCODE_AAC_EXAMPLE) += transcode_aac
> EXAMPLES-$(CONFIG_TRANSCODING_EXAMPLE) += transcoding
> +EXAMPLES-$(CONFIG_VAAPI_DEC_SCALING_EXAMPLE) += vaapi_dec_scaling
> EXAMPLES-$(CONFIG_VAAPI_ENCODE_EXAMPLE) += vaapi_encode
> EXAMPLES-$(CONFIG_VAAPI_TRANSCODE_EXAMPLE) += vaapi_transcode
>
> diff --git a/doc/examples/vaapi_dec_scaling.c
b/doc/examples/vaapi_dec_scaling.c
> new file mode 100644
> index 0000000..6ec65da
> --- /dev/null
> +++ b/doc/examples/vaapi_dec_scaling.c
> @@ -0,0 +1,375 @@
> +/*
> + * Copyright (c) 2018 Jun Zhao
> + *
> + * VA-API Acceleration API (video decoding/scaling) 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
> + * VA-API-Accelerated decoding/scaling example.
> + *
> + * @example vaapi_dec_scaling.c
> + * This example shows how to do VA-API-accelerated decoding/scaling with
output
> + * frames from the HW video surfaces.
> + */
> +
> +#include <stdio.h>
> +
> +#include <libavcodec/avcodec.h>
> +#include <libavformat/avformat.h>
> +#include <libavfilter/buffersink.h>
> +#include <libavfilter/buffersrc.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;
> +AVFilterContext *buffersink_ctx;
> +AVFilterContext *buffersrc_ctx;
> +AVFilterGraph *filter_graph;
> +const char *filter_descr =
> + "format=vaapi,scale_vaapi=w=iw/2:h=ih/2,hwdownload,format=nv12";
> +int init_filter = 0;
> +
> +static int init_hw_decode(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 int init_filters(AVFormatContext *fmt_ctx, AVCodecContext
*dec_ctx,
> + int video_stream_index, const char
*filters_descr)
> +{
> + char args[512];
> + int ret = 0;
> + const AVFilter *buffersrc = avfilter_get_by_name("buffer");
> + const AVFilter *buffersink = avfilter_get_by_name("buffersink");
> + AVFilterInOut *outputs = avfilter_inout_alloc();
> + AVFilterInOut *inputs = avfilter_inout_alloc();
> + AVRational time_base =
fmt_ctx->streams[video_stream_index]->time_base;
> + AVBufferSrcParameters *par = av_buffersrc_parameters_alloc();
> +
> + filter_graph = avfilter_graph_alloc();
> + if (!outputs || !inputs || !filter_graph || !par) {
> + ret = AVERROR(ENOMEM);
> + goto end;
> + }
> +
> + /* buffer video source: the decoded frames from the decoder will be
inserted here. */
> + snprintf(args, sizeof(args),
> +
"video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
> + dec_ctx->width, dec_ctx->height, AV_PIX_FMT_VAAPI,
> + time_base.num, time_base.den,
> + dec_ctx->sample_aspect_ratio.num,
dec_ctx->sample_aspect_ratio.den);
> +
> + ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
> + args, NULL, filter_graph);
> + if (ret < 0) {
> + fprintf(stderr, "Cannot create buffer source\n");
> + goto end;
> + }
> + par->hw_frames_ctx = dec_ctx->hw_frames_ctx;
> + ret = av_buffersrc_parameters_set(buffersrc_ctx, par);
> + if (ret < 0)
> + goto end;
> + av_freep(&par);
> +
> + /* buffer video sink: to terminate the filter chain. */
> + ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink,
"out",
> + NULL, NULL, filter_graph);
> + if (ret < 0) {
> + fprintf(stderr, "Cannot create buffer sink\n");
> + goto end;
> + }
> +
> + /*
> + * Set the endpoints for the filter graph. The filter_graph will
> + * be linked to the graph described by filters_descr.
> + */
> +
> + /*
> + * The buffer source output must be connected to the input pad of
> + * the first filter described by filters_descr; since the first
> + * filter input label is not specified, it is set to "in" by
> + * default.
> + */
> + outputs->name = av_strdup("in");
> + outputs->filter_ctx = buffersrc_ctx;
> + outputs->pad_idx = 0;
> + outputs->next = NULL;
> +
> + /*
> + * The buffer sink input must be connected to the output pad of
> + * the last filter described by filters_descr; since the last
> + * filter output label is not specified, it is set to "out" by
> + * default.
> + */
> + inputs->name = av_strdup("out");
> + inputs->filter_ctx = buffersink_ctx;
> + inputs->pad_idx = 0;
> + inputs->next = NULL;
> +
> + if ((ret = avfilter_graph_parse_ptr(filter_graph, filters_descr,
> + &inputs, &outputs, NULL)) < 0)
> + goto end;
> +
> + for (int i = 0; i < filter_graph->nb_filters; i++) {
> + filter_graph->filters[i]->hw_device_ctx =
av_buffer_ref(hw_device_ctx);
> + if (!filter_graph->filters[i]->hw_device_ctx) {
> + ret = AVERROR(ENOMEM);
> + goto end;
> + }
> + }
> +
> + if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0)
> + goto end;
> +
> +end:
> + avfilter_inout_free(&inputs);
> + avfilter_inout_free(&outputs);
> +
> + return ret;
> +}
> +
> +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_filte(AVFormatContext *input_ctx, AVCodecContext
*avctx,
> + int video_stream, AVPacket *packet)
> +{
> + AVFrame *frame = NULL;
> + AVFrame *filt_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;
> + }
> +
> + frame = av_frame_alloc();
> + filt_frame = av_frame_alloc();
> + if (!frame || !filt_frame) {
> + fprintf(stderr, "Can not alloc frame\n");
> + ret = AVERROR(ENOMEM);
> + return ret;
> + }
> +
> + while (1) {
> + ret = avcodec_receive_frame(avctx, frame);
> + if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
> + av_frame_free(&frame);
> + av_frame_free(&filt_frame);
> + return 0;
> + } else if (ret < 0) {
> + fprintf(stderr, "Error while decoding\n");
> + goto fail;
> + }
> +
> + if (frame->format == hw_pix_fmt) {
> + if (!init_filter) {
> + if ((ret = init_filters(input_ctx, avctx,
> + video_stream, filter_descr)) <
0) {
> + fprintf(stderr, "Failed to init filter\n");
> + goto fail;
> + }
> + init_filter = 1;
> + }
> +
> + /* push the decoded frame into the filtergraph */
> + if (av_buffersrc_add_frame_flags(buffersrc_ctx, frame,
AV_BUFFERSRC_FLAG_KEEP_REF) < 0) {
> + av_log(NULL, AV_LOG_ERROR, "Error while feeding the
filtergraph\n");
> + goto fail;
> + }
> +
> + /* pull filtered frames from the filtergraph */
> + while (1) {
> + ret = av_buffersink_get_frame(buffersink_ctx,
filt_frame);
> + if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
> + break;
> + if (ret < 0)
> + goto fail;
> +
> + size = av_image_get_buffer_size(filt_frame->format,
filt_frame->width,
> + filt_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
*)filt_frame->data,
> + (const int
*)filt_frame->linesize, filt_frame->format,
> + filt_frame->width,
filt_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 filted raw data.\n");
> + goto fail;
> + }
> +
> + av_frame_unref(filt_frame);
> + av_freep(&buffer);
> + }
> + av_frame_unref(frame);
> + }
> + }
> +
> +fail:
> + av_frame_free(&frame);
> + av_frame_free(&filt_frame);
> + av_freep(&buffer);
> +
> + return ret;
> +}
> +
> +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;
> + int i;
> +
> + if (argc < 3) {
> + fprintf(stderr, "Usage: %s <input file> <output file>\n",
argv[0]);
> + return -1;
> + }
> +
> + type = av_hwdevice_find_type_by_name("vaapi");
> + if (type == AV_HWDEVICE_TYPE_NONE) {
> + fprintf(stderr, "Device type vaapi is not supported.\n");
> + fprintf(stderr, "Available device types:");
> + while((type = av_hwdevice_iterate_types(type)) !=
AV_HWDEVICE_TYPE_NONE)
> + fprintf(stderr, " %s", av_hwdevice_get_type_name(type));
> + fprintf(stderr, "\n");
> + return -1;
> + }
> +
> + /* open the input file */
> + if (avformat_open_input(&input_ctx, argv[1], 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;
> +
> + for (i = 0;; i++) {
> + const AVCodecHWConfig *config = avcodec_get_hw_config(decoder,
i);
> + if (!config) {
> + fprintf(stderr, "Decoder %s does not support device type
%s.\n",
> + decoder->name, av_hwdevice_get_type_name(type));
> + return -1;
> + }
> + if (config->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX &&
> + config->device_type == type) {
> + hw_pix_fmt = config->pix_fmt;
> + break;
> + }
> + }
> +
> + 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;
> +
> + if (init_hw_decode(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 scaled data */
> + output_file = fopen(argv[2], "w+");
> +
> + /* actual decoding/scaling 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_filte(input_ctx, decoder_ctx, video_stream,
&packet);
> +
> + av_packet_unref(&packet);
> + }
> +
> + /* flush the decoder/avfilter */
> + packet.data = NULL;
> + packet.size = 0;
> + ret = decode_filte(input_ctx, decoder_ctx, video_stream, &packet);
> + av_packet_unref(&packet);
> +
> + if (output_file)
> + fclose(output_file);
> + avfilter_graph_free(&filter_graph);
> + avcodec_free_context(&decoder_ctx);
> + avformat_close_input(&input_ctx);
> + av_buffer_unref(&hw_device_ctx);
> +
> + return 0;
> +}
> --
Ping, this is the sample to demo how to enable the HWAccel decoder/scaling
from API level, any comments will be welcome. Thanks.
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