/* * Video Acceleration API (video transcoding) transcode sample * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ /** * @file * Intel VAAPI-accelerated transcoding example. * * @example vaapi_transcode.c * This example shows how to do VAAPI-accelerated transcoding. * Usage: vaapi_transcode input_stream codec output_stream * e.g: - vaapi_transcode input.mp4 h264_vaapi output_h264.mp4 *      - vaapi_transcode input.mp4 vp9_vaapi output_vp9.ivf */ #include <stdio.h>#include <errno.h> #include <libavutil/hwcontext.h>#include <libavcodec/avcodec.h>#include <libavformat/avformat.h> static AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;static AVBufferRef *hw_device_ctx = NULL;static AVCodecContext *decoder_ctx = NULL, *encoder_ctx = NULL;static int video_stream = -1;static AVStream *ost;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 != AV_PIX_FMT_NONE; p++) {        if (*p == AV_PIX_FMT_VAAPI)            return *p;    }     fprintf(stderr, "Unable to decode this file using VA-API.\n");    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));        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);    if (!decoder_ctx->hw_device_ctx) {        fprintf(stderr, "A hardware device reference create failed.\n");        return AVERROR(ENOMEM);    }    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;        av_packet_rescale_ts(&enc_pkt, ifmt_ctx->streams[video_stream]->time_base,                             ofmt_ctx->streams[0]->time_base);        ret = av_interleaved_write_frame(ofmt_ctx, &enc_pkt);        if (ret < 0) {            fprintf(stderr, "Error during writing data to output file. "                    "Error code: %s\n", av_err2str(ret));            return -1;        }    } 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) {            /* 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;            }            /* set AVCodecContext Parameters for encoder, here we keep them stay             * the same as decoder.             * xxx: now the sample can't handle resolution change case.             */            encoder_ctx->time_base = av_inv_q(decoder_ctx->framerate);            encoder_ctx->pix_fmt   = AV_PIX_FMT_VAAPI;            encoder_ctx->width     = decoder_ctx->width;            encoder_ctx->height    = decoder_ctx->height;             if ((ret = avcodec_open2(encoder_ctx, enc_codec, NULL)) < 0) {                fprintf(stderr, "Failed to open encode codec. Error code: %s\n",                        av_err2str(ret));                goto fail;            }             if (!(ost = avformat_new_stream(ofmt_ctx, enc_codec))) {                fprintf(stderr, "Failed to allocate stream for output format.\n");                ret = AVERROR(ENOMEM);                goto fail;            }             ost->time_base = encoder_ctx->time_base;            ret = avcodec_parameters_from_context(ost->codecpar, encoder_ctx);            if (ret < 0) {                fprintf(stderr, "Failed to copy the stream parameters. "                        "Error code: %s\n", av_err2str(ret));                goto fail;            }             /* write the stream header */            if ((ret = avformat_write_header(ofmt_ctx, NULL)) < 0) {                fprintf(stderr, "Error while writing stream header. "                        "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"                "The output format is guessed according to the file extension.\n"                "\n", argv[0]);        return -1;    }     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 ((ret = (avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, argv[3]))) < 0) {        fprintf(stderr, "Failed to deduce output format from file extension. Error code: "                "%s\n", av_err2str(ret));        goto end;    }     if (!(encoder_ctx = avcodec_alloc_context3(enc_codec))) {        ret = AVERROR(ENOMEM);        goto end;    }     ret = avio_open(&ofmt_ctx->pb, argv[3], AVIO_FLAG_WRITE);    if (ret < 0) {        fprintf(stderr, "Cannot open output file. "                "Error code: %s\n", av_err2str(ret));        goto end;    }     /* 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);     /* write the trailer for output stream */    av_write_trailer(ofmt_ctx); end:    avformat_close_input(&ifmt_ctx);    avformat_close_input(&ofmt_ctx);    avcodec_free_context(&decoder_ctx);    avcodec_free_context(&encoder_ctx);    av_buffer_unref(&hw_device_ctx);    return ret;}