examples: Add a VA-API transcode example.
Usage is: ./vaapi_transcode input_stream codec output_stream For example: - ./vaapi_transcode input.mp4 h264_vaapi output_h264.mp4 - ./vaapi_transcode input.mp4 vp8_vaapi output_vp8.ivf Does not handle resolution changes on the input stream. Signed-off-by: Jun Zhao <jun.zhao@intel.com> Signed-off-by: Liu, Kaixuan <kaixuan.liu@intel.com> Signed-off-by: Mark Thompson <sw@jkqxz.net>
This commit is contained in:
Jun Zhao
Mark Thompson
parent
3caecf7ce8
commit
0519e66a90
2
configure
vendored
2
configure
vendored
@ -1526,6 +1526,7 @@ EXAMPLE_LIST="
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transcode_aac_example
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transcoding_example
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vaapi_encode_example
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vaapi_transcode_example
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"
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EXTERNAL_AUTODETECT_LIBRARY_LIST="
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@ -3320,6 +3321,7 @@ scaling_video_example_deps="avutil swscale"
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transcode_aac_example_deps="avcodec avformat swresample"
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transcoding_example_deps="avfilter avcodec avformat avutil"
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vaapi_encode_example_deps="avcodec avutil h264_vaapi_encoder"
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vaapi_transcode_example_deps="avcodec avformat avutil h264_vaapi_encoder"
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# EXTRALIBS_LIST
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cpu_init_extralibs="pthreads_extralibs"
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@ -20,6 +20,7 @@ EXAMPLES-$(CONFIG_SCALING_VIDEO_EXAMPLE) += scaling_video
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EXAMPLES-$(CONFIG_TRANSCODE_AAC_EXAMPLE) += transcode_aac
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EXAMPLES-$(CONFIG_TRANSCODING_EXAMPLE) += transcoding
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EXAMPLES-$(CONFIG_VAAPI_ENCODE_EXAMPLE) += vaapi_encode
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EXAMPLES-$(CONFIG_VAAPI_TRANSCODE_EXAMPLE) += vaapi_transcode
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EXAMPLES := $(EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)$(EXESUF))
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EXAMPLES_G := $(EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)_g$(EXESUF))
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306
doc/examples/vaapi_transcode.c
Normal file
306
doc/examples/vaapi_transcode.c
Normal file
@ -0,0 +1,306 @@
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/*
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* Video Acceleration API (video transcoding) transcode sample
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Intel VAAPI-accelerated transcoding example.
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*
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* @example vaapi_transcode.c
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* This example shows how to do VAAPI-accelerated transcoding.
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* Usage: vaapi_transcode input_stream codec output_stream
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* e.g: - vaapi_transcode input.mp4 h264_vaapi output_h264.mp4
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* - vaapi_transcode input.mp4 vp9_vaapi output_vp9.ivf
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <libavutil/hwcontext.h>
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#include <libavcodec/avcodec.h>
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#include <libavformat/avformat.h>
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static AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
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static AVBufferRef *hw_device_ctx = NULL;
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static AVCodecContext *decoder_ctx = NULL, *encoder_ctx = NULL;
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static int video_stream = -1;
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static AVStream *ost;
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static int initialized = 0;
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static enum AVPixelFormat get_vaapi_format(AVCodecContext *ctx,
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const enum AVPixelFormat *pix_fmts)
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{
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const enum AVPixelFormat *p;
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for (p = pix_fmts; *p != AV_PIX_FMT_NONE; p++) {
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if (*p == AV_PIX_FMT_VAAPI)
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return *p;
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}
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fprintf(stderr, "Unable to decode this file using VA-API.\n");
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return AV_PIX_FMT_NONE;
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}
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static int open_input_file(const char *filename)
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{
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int ret;
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AVCodec *decoder = NULL;
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AVStream *video = NULL;
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if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) {
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fprintf(stderr, "Cannot open input file '%s', Error code: %s\n",
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filename, av_err2str(ret));
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return ret;
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}
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if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) {
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fprintf(stderr, "Cannot find input stream information. Error code: %s\n",
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av_err2str(ret));
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return ret;
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}
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ret = av_find_best_stream(ifmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &decoder, 0);
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if (ret < 0) {
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fprintf(stderr, "Cannot find a video stream in the input file. "
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"Error code: %s\n", av_err2str(ret));
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return ret;
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}
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video_stream = ret;
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if (!(decoder_ctx = avcodec_alloc_context3(decoder)))
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return AVERROR(ENOMEM);
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video = ifmt_ctx->streams[video_stream];
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if ((ret = avcodec_parameters_to_context(decoder_ctx, video->codecpar)) < 0) {
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fprintf(stderr, "avcodec_parameters_to_context error. Error code: %s\n",
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av_err2str(ret));
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return ret;
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}
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decoder_ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx);
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if (!decoder_ctx->hw_device_ctx) {
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fprintf(stderr, "A hardware device reference create failed.\n");
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return AVERROR(ENOMEM);
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}
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decoder_ctx->get_format = get_vaapi_format;
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if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0)
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fprintf(stderr, "Failed to open codec for decoding. Error code: %s\n",
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av_err2str(ret));
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return ret;
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}
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static int encode_write(AVFrame *frame)
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{
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int ret = 0;
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AVPacket enc_pkt;
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av_init_packet(&enc_pkt);
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enc_pkt.data = NULL;
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enc_pkt.size = 0;
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if ((ret = avcodec_send_frame(encoder_ctx, frame)) < 0) {
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fprintf(stderr, "Error during encoding. Error code: %s\n", av_err2str(ret));
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goto end;
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}
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while (1) {
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ret = avcodec_receive_packet(encoder_ctx, &enc_pkt);
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if (ret)
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break;
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enc_pkt.stream_index = 0;
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av_packet_rescale_ts(&enc_pkt, ifmt_ctx->streams[video_stream]->time_base,
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ofmt_ctx->streams[0]->time_base);
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ret = av_interleaved_write_frame(ofmt_ctx, &enc_pkt);
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if (ret < 0) {
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fprintf(stderr, "Error during writing data to output file. "
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"Error code: %s\n", av_err2str(ret));
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return -1;
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}
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}
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end:
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if (ret == AVERROR_EOF)
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return 0;
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ret = ((ret == AVERROR(EAGAIN)) ? 0:-1);
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return ret;
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}
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static int dec_enc(AVPacket *pkt, AVCodec *enc_codec)
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{
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AVFrame *frame;
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int ret = 0;
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ret = avcodec_send_packet(decoder_ctx, pkt);
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if (ret < 0) {
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fprintf(stderr, "Error during decoding. Error code: %s\n", av_err2str(ret));
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return ret;
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}
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while (ret >= 0) {
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if (!(frame = av_frame_alloc()))
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return AVERROR(ENOMEM);
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ret = avcodec_receive_frame(decoder_ctx, frame);
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if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
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av_frame_free(&frame);
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return 0;
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} else if (ret < 0) {
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fprintf(stderr, "Error while decoding. Error code: %s\n", av_err2str(ret));
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goto fail;
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}
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if (!initialized) {
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/* we need to ref hw_frames_ctx of decoder to initialize encoder's codec.
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Only after we get a decoded frame, can we obtain its hw_frames_ctx */
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encoder_ctx->hw_frames_ctx = av_buffer_ref(decoder_ctx->hw_frames_ctx);
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if (!encoder_ctx->hw_frames_ctx) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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/* set AVCodecContext Parameters for encoder, here we keep them stay
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* the same as decoder.
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* xxx: now the the sample can't handle resolution change case.
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*/
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encoder_ctx->time_base = av_inv_q(decoder_ctx->framerate);
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encoder_ctx->pix_fmt = AV_PIX_FMT_VAAPI;
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encoder_ctx->width = decoder_ctx->width;
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encoder_ctx->height = decoder_ctx->height;
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if ((ret = avcodec_open2(encoder_ctx, enc_codec, NULL)) < 0) {
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fprintf(stderr, "Failed to open encode codec. Error code: %s\n",
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av_err2str(ret));
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goto fail;
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}
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if (!(ost = avformat_new_stream(ofmt_ctx, enc_codec))) {
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fprintf(stderr, "Failed to allocate stream for output format.\n");
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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ost->time_base = encoder_ctx->time_base;
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ret = avcodec_parameters_from_context(ost->codecpar, encoder_ctx);
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if (ret < 0) {
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fprintf(stderr, "Failed to copy the stream parameters. "
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"Error code: %s\n", av_err2str(ret));
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goto fail;
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}
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/* write the stream header */
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if ((ret = avformat_write_header(ofmt_ctx, NULL)) < 0) {
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fprintf(stderr, "Error while writing stream header. "
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"Error code: %s\n", av_err2str(ret));
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goto fail;
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}
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initialized = 1;
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}
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if ((ret = encode_write(frame)) < 0)
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fprintf(stderr, "Error during encoding and writing.\n");
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fail:
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av_frame_free(&frame);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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int main(int argc, char **argv)
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{
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int ret = 0;
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AVPacket dec_pkt;
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AVCodec *enc_codec;
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if (argc != 4) {
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fprintf(stderr, "Usage: %s <input file> <encode codec> <output file>\n"
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"The output format is guessed according to the file extension.\n"
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"\n", argv[0]);
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return -1;
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}
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av_register_all();
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ret = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_VAAPI, NULL, NULL, 0);
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if (ret < 0) {
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fprintf(stderr, "Failed to create a VAAPI device. Error code: %s\n", av_err2str(ret));
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return -1;
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}
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if ((ret = open_input_file(argv[1])) < 0)
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goto end;
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if (!(enc_codec = avcodec_find_encoder_by_name(argv[2]))) {
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fprintf(stderr, "Could not find encoder '%s'\n", argv[2]);
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ret = -1;
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goto end;
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}
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if ((ret = (avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, argv[3]))) < 0) {
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fprintf(stderr, "Failed to deduce output format from file extension. Error code: "
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"%s\n", av_err2str(ret));
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goto end;
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}
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if (!(encoder_ctx = avcodec_alloc_context3(enc_codec))) {
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ret = AVERROR(ENOMEM);
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goto end;
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}
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ret = avio_open(&ofmt_ctx->pb, argv[3], AVIO_FLAG_WRITE);
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if (ret < 0) {
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fprintf(stderr, "Cannot open output file. "
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"Error code: %s\n", av_err2str(ret));
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goto end;
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}
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/* read all packets and only transcoding video */
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while (ret >= 0) {
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if ((ret = av_read_frame(ifmt_ctx, &dec_pkt)) < 0)
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break;
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if (video_stream == dec_pkt.stream_index)
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ret = dec_enc(&dec_pkt, enc_codec);
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av_packet_unref(&dec_pkt);
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}
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/* flush decoder */
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dec_pkt.data = NULL;
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dec_pkt.size = 0;
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ret = dec_enc(&dec_pkt, enc_codec);
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av_packet_unref(&dec_pkt);
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/* flush encoder */
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ret = encode_write(NULL);
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/* write the trailer for output stream */
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av_write_trailer(ofmt_ctx);
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end:
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avformat_close_input(&ifmt_ctx);
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avformat_close_input(&ofmt_ctx);
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avcodec_free_context(&decoder_ctx);
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avcodec_free_context(&encoder_ctx);
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av_buffer_unref(&hw_device_ctx);
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return ret;
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}
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