On 06/11/17 06:56, Jun Zhao wrote:
> From d16f766363d9ecc240b0f8e025c2a8f91ea4775e Mon Sep 17 00:00:00 2001
> From: Jun Zhao <jun.z...@intel.com>
> Date: Mon, 6 Nov 2017 14:45:27 +0800
> Subject: [PATCH] examples/vaapi_encode: Add a VA-API encode example.
>
> add a VA-API encode example, only support NV12 input, usage like:
> ./vaapi_encode 1920 1080 test.yuv test.h264
>
> Signed-off-by: Jun Zhao <jun.z...@intel.com>
> Signed-off-by: Liu, Kaixuan <kaixuan....@intel.com>
> ---
> configure | 2 +
> doc/examples/Makefile | 1 +
> doc/examples/vaapi_encode.c | 308
> ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 311 insertions(+)
> create mode 100644 doc/examples/vaapi_encode.c
>
> diff --git a/configure b/configure
> index 1b0f064607..2df0205e09 100755
> --- a/configure
> +++ b/configure
> @@ -1524,6 +1524,7 @@ EXAMPLE_LIST="
> scaling_video_example
> transcode_aac_example
> transcoding_example
> + vaapi_encode_example
> "
>
> EXTERNAL_AUTODETECT_LIBRARY_LIST="
> @@ -3294,6 +3295,7 @@ 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_encode_example_deps="avfilter avcodec avformat avutil"
>
> # EXTRALIBS_LIST
> cpu_init_extralibs="pthreads_extralibs"
> diff --git a/doc/examples/Makefile b/doc/examples/Makefile
> index 58afd71b85..da5af36532 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_ENCODE_EXAMPLE) += vaapi_encode
>
> EXAMPLES := $(EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)$(EXESUF))
> EXAMPLES_G := $(EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)_g$(EXESUF))
> diff --git a/doc/examples/vaapi_encode.c b/doc/examples/vaapi_encode.c
> new file mode 100644
> index 0000000000..02b1ac5a4a
> --- /dev/null
> +++ b/doc/examples/vaapi_encode.c
> @@ -0,0 +1,308 @@
> +/*
> + * Video Acceleration API (video encoding) encode 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 encoding example.
> + *
> + * @example vaapi_encode.c
> + * This example shows how to do VAAPI-accelerated encoding. now only support
> NV12
> + * raw file, usage like: vaapi_enc 1920 1080 input.yuv output.h264
> + */
> +
> +#include <stdio.h>
> +#include <string.h>
> +#include <errno.h>
> +
> +#include <libavcodec/avcodec.h>
> +#include <libavformat/avformat.h>
> +#include <libavfilter/avfiltergraph.h>
> +#include <libavfilter/buffersink.h>
> +#include <libavfilter/buffersrc.h>
> +#include <libavutil/pixdesc.h>
> +#include <libavutil/hwcontext.h>
> +
> +typedef struct FilterContext {
> + AVFilterContext *buffersink_ctx;
> + AVFilterContext *buffersrc_ctx;
> + AVFilterGraph *filter_graph;
> +} FilterContext;
> +
> +static int width, height;
> +static AVBufferRef *hw_device_ctx = NULL;
> +
> +static int init_filter(FilterContext *filter_ctx, char *args, AVBufferRef
> *hw_device_ctx)
> +{
> + char filter_spec[] = "format=nv12,hwupload";
> + int ret = 0, i = 0;
> + const AVFilter *buffersrc, *buffersink;
> + AVFilterContext *buffersrc_ctx, *buffersink_ctx;
> + AVFilterInOut *outputs = avfilter_inout_alloc();
> + AVFilterInOut *inputs = avfilter_inout_alloc();
> + AVFilterGraph *filter_graph = avfilter_graph_alloc();
> +
> + buffersrc = avfilter_get_by_name("buffer");
> + buffersink = avfilter_get_by_name("buffersink");
> + if (!buffersrc || !buffersink) {
> + av_log(NULL, AV_LOG_ERROR, "filtering source or sink element not
> found\n");
> + ret = AVERROR_UNKNOWN;
> + goto fail;
> + }
> +
> + ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
> + args, NULL, filter_graph);
> + if (ret < 0) {
> + av_log(NULL, AV_LOG_ERROR, "Cannot create buffer source. Error
> code:%s\n", av_err2str(ret));
> + goto fail;
> + }
> + ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
> + NULL, NULL, filter_graph);
> + if (ret < 0) {
> + av_log(NULL, AV_LOG_ERROR, "Cannot create buffer sink. Error
> code:%s\n", av_err2str(ret));
> + goto fail;
> + }
> +
> + outputs->name = av_strdup("in");
> + outputs->filter_ctx = buffersrc_ctx;
> + outputs->pad_idx = 0;
> + outputs->next = NULL;
> + inputs->name = av_strdup("out");
> + inputs->filter_ctx = buffersink_ctx;
> + inputs->pad_idx = 0;
> + inputs->next = NULL;
> + if (!outputs->name || !inputs->name) {
> + ret = AVERROR(ENOMEM);
> + goto fail;
> + }
> +
> + if ((ret = avfilter_graph_parse_ptr(filter_graph, filter_spec,
> + &inputs, &outputs, NULL)) < 0) {
> + av_log(NULL, AV_LOG_ERROR, "Error code: %s\n", av_err2str(ret));
> + goto fail;
> + }
> +
> + if (hw_device_ctx) {
> + for (i = 0; i < filter_graph->nb_filters; i++) {
> + filter_graph->filters[i]->hw_device_ctx =
> av_buffer_ref(hw_device_ctx);
> + }
> + }
> +
> + if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0) {
> + av_log(NULL, AV_LOG_ERROR, "Fail to config filter graph. Error code:
> %s\n", av_err2str(ret));
> + goto fail;
> + }
> +
> + filter_ctx->buffersrc_ctx = buffersrc_ctx;
> + filter_ctx->buffersink_ctx = buffersink_ctx;
> + filter_ctx->filter_graph = filter_graph;
> +
> +fail:
> + avfilter_inout_free(&inputs);
> + avfilter_inout_free(&outputs);
> + return ret;
> +}
Do you really want to use libavfilter here for the upload? Given that you
require NV12 input, this could be done more easily by making a new hwframe
context and transfering data to that.
> +
> +static int encode_write(AVCodecContext *avctx, AVFrame *frame, FILE *fout)
> +{
> + int ret = 0;
> + AVPacket enc_pkt;
> +
> + av_init_packet(&enc_pkt);
> + enc_pkt.data = NULL;
> + enc_pkt.size = 0;
> +
> + if ((ret = avcodec_send_frame(avctx, frame)) < 0) {
> + fprintf(stderr, "Error code: %s\n", av_err2str(ret));
> + goto end;
> + }
> + while (1) {
> + ret = avcodec_receive_packet(avctx, &enc_pkt);
> + if (ret)
> + break;
> +
> + enc_pkt.stream_index = 0;
> + ret = fwrite(enc_pkt.data, enc_pkt.size, 1, fout);
For an example, I think it would be better not to rely on the implicit
av_packet_unref() in avcodec_receive_packet().
> + }
> +
> +end:
> + ret = ((ret == AVERROR(EAGAIN)) ? 0 : -1);
> + return ret;
> +}
> +
> +int main(int argc, char *argv[])
> +{
> + int ret, size;
> + FILE *fin = NULL, *fout = NULL;
> + AVFrame *sw_frame = NULL, *hw_frame = NULL;
> + AVCodecContext *avctx = NULL;
> + FilterContext *filter_ctx = NULL;
> + AVCodec *codec = NULL;
> + const char *enc_name = "h264_vaapi";
> + char args[512];
> +
> + if (argc < 4) {
< 5
> + fprintf(stderr, "Usage: %s <width> <height> <input file> <output
> file>\n", argv[0]);
> + return -1;
> + }
> +
> + width = atoi(argv[1]);
> + height = atoi(argv[2]);
> + size = width * height;
> +
> + if (!(fin = fopen(argv[3], "r"))) {
> + fprintf(stderr, "Fail to open input file : %s\n", strerror(errno));
> + ret = -1;
> + goto close;
> + }
> + if (!(fout = fopen(argv[4], "w+b"))) {
> + fprintf(stderr, "Fail to open output file : %s\n", strerror(errno));
> + ret = -1;
> + goto close;
> + }
> +
> + av_register_all();
> + avfilter_register_all();
> +
> + ret = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_VAAPI,
> + NULL, NULL, 0);
> + if (ret < 0) {
> + fprintf(stderr, "Failed to create a VAAPI device. Error code: %s\n",
> av_err2str(ret));
> + goto close;
> + }
> +
> + if (!(codec = avcodec_find_encoder_by_name(enc_name))) {
> + fprintf(stderr, "Could not find encoder.\n");
> + ret = -1;
> + goto close;
> + }
> +
> + if (!(avctx = avcodec_alloc_context3(codec))) {
> + ret = AVERROR(ENOMEM);
> + goto close;
> + }
> +
> + avctx->width = width;
> + avctx->height = height;
> + avctx->time_base = (AVRational){1, 25};
> + avctx->framerate = (AVRational){25, 1};
> + avctx->sample_aspect_ratio = (AVRational){1, 1};
> + avctx->pix_fmt = AV_PIX_FMT_VAAPI;
> +
> + /* create filters and binding HWDevice */
> + snprintf(args, sizeof(args),
> +
> "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d:frame_rate=%d/%d",
> + avctx->width, avctx->height, AV_PIX_FMT_NV12,
> + avctx->time_base.num, avctx->time_base.den,
> + avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den,
> + avctx->framerate.num, avctx->framerate.den);
> +
> + if (!(filter_ctx = av_malloc(sizeof(*filter_ctx)))) {
> + ret = AVERROR(ENOMEM);
> + goto close;
> + }
> +
> + if ((ret = init_filter(filter_ctx, args, hw_device_ctx)) < 0) {
> + fprintf(stderr, "Failed to initialize the filtering context.\n");
> + goto close;
> + }
> +
> + avctx->hw_frames_ctx = av_buffer_ref(av_buffersink_get_hw_frames_ctx
> + (filter_ctx->buffersink_ctx));
> + if (!avctx->hw_frames_ctx) {
> + ret = AVERROR(ENOMEM);
> + goto close;
> + }
> +
> + if ((ret = avcodec_open2(avctx, codec, NULL)) < 0) {
> + fprintf(stderr, "Cannot open video encoder codec. Error code: %s\n",
> av_err2str(ret));
> + goto close;
> + }
> +
> + while (1) {
> + if (!(sw_frame = av_frame_alloc())) {
> + ret = AVERROR(ENOMEM);
> + goto close;
> + }
> + sw_frame->width = width;
> + sw_frame->height = height;
> + sw_frame->format = AV_PIX_FMT_NV12;
> + if ((ret = av_frame_get_buffer(sw_frame, 32)) < 0)
> + goto close;
> + if ((ret = fread((uint8_t*)(sw_frame->data[0]), size, 1, fin)) <= 0)
> + break;
> + if ((ret = fread((uint8_t*)(sw_frame->data[1]), size/2, 1, fin)) <=
> 0)
> + break;
> + /* push the sw frame into the filtergraph */
> + ret = av_buffersrc_add_frame_flags(filter_ctx->buffersrc_ctx,
> sw_frame, 0);
> + if (ret < 0) {
> + fprintf(stderr, "Error while feeding the filtergraph. Error
> code: %s\n", av_err2str(ret));
> + goto close;
> + }
> + /* pull hw frames from the filtergraph */
> + while (1) {
> + if (!(hw_frame = av_frame_alloc())) {
> + ret = AVERROR(ENOMEM);
> + goto close;
> + }
> + if ((ret = (av_buffersink_get_frame(filter_ctx->buffersink_ctx,
> hw_frame))) < 0) {
> + /* if no more frames for output - returns AVERROR(EAGAIN)
> + * if flushed and no more frames for output - returns
> AVERROR_EOF
> + * rewrite retcode to 0 to show it as normal procedure
> completion
> + */
> + if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
> + ret = 0;
> + av_frame_free(&hw_frame);
> + break;
> + }
> +
> + if ((ret = (encode_write(avctx, hw_frame, fout))) < 0) {
> + fprintf(stderr, "Failed to encode.\n");
> + goto close;
> + }
> + av_frame_free(&hw_frame);
> + }
> + av_frame_free(&sw_frame);
> + }
> +
> + /* flush encode */
> + ret = encode_write(avctx, NULL, fout);
> +
> +close:
> + if (fin)
> + fclose(fin);
> + if (fout)
> + fclose(fout);
> + if (sw_frame)
> + av_frame_free(&sw_frame);
> + if (hw_frame)
> + av_frame_free(&hw_frame);
> + if (avctx)
> + avcodec_free_context(&avctx);
> + if (filter_ctx) {
> + avfilter_free(filter_ctx->buffersrc_ctx);
> + avfilter_free(filter_ctx->buffersink_ctx);
> + avfilter_graph_free(&(filter_ctx->filter_graph));
> + av_free(filter_ctx);
> + }
> + if (hw_device_ctx)
> + av_buffer_unref(&hw_device_ctx);
These free functions don't require a check - they accept and do nothing with a
null pointer.
> +
> + return ret;
This ends up returning -1 from the program when everything worked, which is a
bit odd.
> +}
> --
> 2.14.1
>
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