On 11/01/18 07:07, Jun Zhao wrote: > From b76a2f790814df326d7d93c54b14b3c8e74ab759 Mon Sep 17 00:00:00 2001 > From: Jun Zhao <jun.z...@intel.com> > Date: Thu, 11 Jan 2018 15:00:30 +0800 > Subject: [PATCH 2/2] example/vaapi_transcode: Add a VA-API transcode example. > > Add VA-API transcoding example, useage like: > ./vaapi_transcode input_stream h264_vaapi output_stream > > 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_transcode.c | 256 > +++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 259 insertions(+) > create mode 100644 doc/examples/vaapi_transcode.c > > diff --git a/configure b/configure > index b8985ba542..6d08c0fbbb 100755 > --- a/configure > +++ b/configure > @@ -1526,6 +1526,7 @@ EXAMPLE_LIST=" > transcode_aac_example > transcoding_example > vaapi_encode_example > + vaapi_transcode_example > " > > EXTERNAL_AUTODETECT_LIBRARY_LIST=" > @@ -3319,6 +3320,7 @@ scaling_video_example_deps="avutil swscale" > transcode_aac_example_deps="avcodec avformat swresample" > transcoding_example_deps="avfilter avcodec avformat avutil" > vaapi_encode_example_deps="avcodec avutil" > +vaapi_transcode_example_deps="avcodec avformat avutil" > > # EXTRALIBS_LIST > cpu_init_extralibs="pthreads_extralibs" > diff --git a/doc/examples/Makefile b/doc/examples/Makefile > index da5af36532..928ff306b3 100644 > --- a/doc/examples/Makefile > +++ b/doc/examples/Makefile > @@ -20,6 +20,7 @@ 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-$(CONFIG_VAAPI_TRANSCODE_EXAMPLE) += vaapi_transcode > > EXAMPLES := $(EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)$(EXESUF)) > EXAMPLES_G := $(EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)_g$(EXESUF)) > diff --git a/doc/examples/vaapi_transcode.c b/doc/examples/vaapi_transcode.c > new file mode 100644 > index 0000000000..b92a387f2f > --- /dev/null > +++ b/doc/examples/vaapi_transcode.c > @@ -0,0 +1,256 @@ > +/* > + * Video Acceleration API (video transcoding) transcode 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 transcoding example. > + * > + * @example vaapi_transcode.c > + * This example shows how to do VAAPI-accelerated transcoding. > + * Usage: vaapi_transcode input_stream h264_vaapi output_stream > + */ > + > +#include <stdio.h> > +#include <libavcodec/avcodec.h> > +#include <libavformat/avformat.h> > +#include <libavutil/hwcontext.h> > +#include <libavutil/avassert.h> > +#include <errno.h> > + > +static AVFormatContext *ifmt_ctx = NULL; > +static AVBufferRef *hw_device_ctx = NULL; > +static AVCodecContext *decoder_ctx = NULL, *encoder_ctx = NULL; > +static int video_stream = -1; > +static FILE *fout; > +static int initialized = 0; > + > +static enum AVPixelFormat get_vaapi_format(AVCodecContext *ctx, > + const enum AVPixelFormat > *pix_fmts) > +{ > + const enum AVPixelFormat *p; > + > + for (p = pix_fmts; *p != -1; p++) {
AV_PIX_FMT_NONE would be clearer than -1 here. > + if (*p == AV_PIX_FMT_VAAPI) > + return *p; > + } > + > + fprintf(stderr, "Failed to get vaapi pix format\n"); Maybe something like "Unable to decode this file using VAAPI", since that's what it actually means (the decoder didn't offer the VAAPI output format). > + return AV_PIX_FMT_NONE; > +} > + > +static int open_input_file(const char *filename) > +{ > + int ret; > + AVCodec *decoder = NULL; > + AVStream *video = NULL; > + > + if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) { > + fprintf(stderr, "Cannot open input file '%s', Error code: %s\n", > + filename, av_err2str(ret)); > + return ret; > + } > + > + if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) { > + fprintf(stderr, "Cannot find input stream information. Error code: > %s\n", > + av_err2str(ret)); > + return ret; > + } > + > + ret = av_find_best_stream(ifmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, > &decoder, 0); > + if (ret < 0) { > + fprintf(stderr, "Cannot find a video stream in the input file.\ > + Error code: %s\n", av_err2str(ret)); Use multiple string constants ("foo" "bar") rather than continuation escapes - this is putting a lot of spaces in the middle of the message. > + return ret; > + } > + video_stream = ret; > + > + if (!(decoder_ctx = avcodec_alloc_context3(decoder))) > + return AVERROR(ENOMEM); > + > + video = ifmt_ctx->streams[video_stream]; > + if ((ret = avcodec_parameters_to_context(decoder_ctx, video->codecpar)) > < 0) { > + fprintf(stderr, "avcodec_parameters_to_context error. Error code: > %s\n", > + av_err2str(ret)); > + return ret; > + } > + > + decoder_ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx); > + decoder_ctx->get_format = get_vaapi_format; > + > + if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0) > + fprintf(stderr, "Failed to open codec for decoding. Error code: > %s\n", > + av_err2str(ret)); > + > + return ret; > +} > + > +static int encode_write(AVFrame *frame) > +{ > + int ret = 0; > + AVPacket enc_pkt; > + > + av_init_packet(&enc_pkt); > + enc_pkt.data = NULL; > + enc_pkt.size = 0; > + > + if ((ret = avcodec_send_frame(encoder_ctx, frame)) < 0) { > + fprintf(stderr, "Error during encoding. Error code: %s\n", > av_err2str(ret)); > + goto end; > + } > + while (1) { > + ret = avcodec_receive_packet(encoder_ctx, &enc_pkt); > + if (ret) > + break; > + > + enc_pkt.stream_index = 0; > + ret = fwrite(enc_pkt.data, 1, enc_pkt.size, fout); fwrite() can fail (returning zero). > + } > + > +end: > + if (ret == AVERROR_EOF) > + return 0; > + ret = ((ret == AVERROR(EAGAIN)) ? 0:-1); > + return ret; > +} > + > +static int dec_enc(AVPacket *pkt, AVCodec *enc_codec) > +{ > + AVFrame *frame; > + int ret = 0; > + > + ret = avcodec_send_packet(decoder_ctx, pkt); > + if (ret < 0) { > + fprintf(stderr, "Error during decoding. Error code: %s\n", > av_err2str(ret)); > + return ret; > + } > + > + while (ret >= 0) { > + if (!(frame = av_frame_alloc())) > + return AVERROR(ENOMEM); > + > + ret = avcodec_receive_frame(decoder_ctx, frame); > + if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) { > + av_frame_free(&frame); > + return 0; > + } else if (ret < 0) { > + fprintf(stderr, "Error while decoding. Error code: %s\n", > av_err2str(ret)); > + goto fail; > + } > + > + if (!initialized) { > + /* Here we need to ref hw_frames_ctx of decoder to initialize > encoder's codec. > + Only after we get a decoded frame, can we obtain its > hw_frames_ctx */ > + encoder_ctx->hw_frames_ctx = > av_buffer_ref(decoder_ctx->hw_frames_ctx); > + if (!encoder_ctx->hw_frames_ctx) { > + ret = AVERROR(ENOMEM); > + goto fail; > + } > + if ((ret = avcodec_open2(encoder_ctx, enc_codec, NULL)) < 0) { > + fprintf(stderr, "Error while open encode codec. Error code: > %s\n", > + av_err2str(ret)); > + goto fail; > + } > + initialized = 1; > + } > + > + if ((ret = encode_write(frame)) < 0) > + fprintf(stderr, "Error during encoding and writing.\n"); > + > +fail: > + av_frame_free(&frame); > + if (ret < 0) > + return ret; > + } > + return 0; > +} > + > +int main(int argc, char **argv) { > + int ret = 0; > + AVPacket dec_pkt; > + AVCodec *enc_codec; > + > + if (argc != 4) { > + fprintf(stderr, "Usage: %s <input file> <encode codec> <output > file>\n", argv[0]); > + return -1; > + } > + > + av_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)); > + return -1; > + } > + > + if ((ret = open_input_file(argv[1])) < 0) > + goto end; > + > + if (!(enc_codec = avcodec_find_encoder_by_name(argv[2]))) { > + fprintf(stderr, "Could not find encoder '%s'\n", argv[2]); > + ret = -1; > + goto end; > + } > + > + if (!(fout = fopen(argv[3], "w+b"))) { > + fprintf(stderr, "Failed to open output file: %s\n", strerror(errno)); > + ret = -1; > + goto end; > + } > + > + if (!(encoder_ctx= avcodec_alloc_context3(enc_codec))) { > + ret = AVERROR(ENOMEM); > + goto end; > + } > + > + /* set AVCodecContext Parameters */ > + encoder_ctx->width = decoder_ctx->width; > + encoder_ctx->height = decoder_ctx->height; Not sure you necessarily know this width and height here before the decoder has produced any output? libavformat may have filled this in some cases, but I don't think it has to in all. > + encoder_ctx->time_base = (AVRational){1, 25}; > + encoder_ctx->pix_fmt = AV_PIX_FMT_VAAPI; > + > + /* read all packets and only transcoding video */ > + while (ret >= 0) { > + if ((ret = av_read_frame(ifmt_ctx, &dec_pkt)) < 0) > + break; > + > + if (video_stream == dec_pkt.stream_index) > + ret = dec_enc(&dec_pkt, enc_codec); > + > + av_packet_unref(&dec_pkt); > + } > + > + /* flush decoder */ > + dec_pkt.data = NULL; > + dec_pkt.size = 0; > + ret = dec_enc(&dec_pkt, enc_codec); > + av_packet_unref(&dec_pkt); > + > + /* flush encoder */ > + ret = encode_write(NULL); > + > +end: > + avformat_close_input(&ifmt_ctx); > + if (fout) > + fclose(fout); > + avcodec_free_context(&decoder_ctx); > + avcodec_free_context(&encoder_ctx); > + av_buffer_unref(&hw_device_ctx); > + return ret; > +} > -- > 2.14.1 > Generally looks fine, and tested a bit. Probably ignorable, but I note it doesn't produce a usable stream for VP8/VP9 because they don't support raw streams like this. Thanks, - Mark _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel