307 lines
9.8 KiB
C
307 lines
9.8 KiB
C
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/*
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* Video Acceleration API (video transcoding) transcode sample
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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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 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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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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