/* * 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 QSV-accelerated video transcoding API usage example * @example qsv_transcode.c * * Perform QSV-accelerated transcoding and show to dynamically change * encoder's options. * * Usage: qsv_transcode input_stream codec output_stream initial option *                      { frame_number new_option } * e.g: - qsv_transcode input.mp4 h264_qsv output_h264.mp4 "g 60" *      - qsv_transcode input.mp4 hevc_qsv output_hevc.mp4 "g 60 async_depth 1" *                      100 "g 120" *         (initialize codec with gop_size 60 and change it to 120 after 100 *          frames) */ #include <stdio.h>#include <errno.h> #include <libavutil/hwcontext.h>#include <libavutil/mem.h>#include <libavcodec/avcodec.h>#include <libavformat/avformat.h>#include <libavutil/opt.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; typedef struct DynamicSetting {    int frame_number;    char* optstr;} DynamicSetting;static DynamicSetting *dynamic_setting;static int setting_number;static int current_setting_number; static int str_to_dict(char* optstr, AVDictionary **opt){    char *key, *value;    if (strlen(optstr) == 0)        return 0;    key = strtok(optstr, " ");    if (key == NULL)        return AVERROR(EINVAL);    value = strtok(NULL, " ");    if (value == NULL)        return AVERROR(EINVAL);    av_dict_set(opt, key, value, 0);    do {        key = strtok(NULL, " ");        if (key == NULL)            return 0;        value = strtok(NULL, " ");        if (value == NULL)            return AVERROR(EINVAL);        av_dict_set(opt, key, value, 0);    } while(1);} static int dynamic_set_parameter(AVCodecContext *avctx){    AVDictionary *opts = NULL;    int ret = 0;    static int frame_number = 0;    frame_number++;    if (current_setting_number < setting_number &&        frame_number == dynamic_setting[current_setting_number].frame_number) {        AVDictionaryEntry *e = NULL;        ret = str_to_dict(dynamic_setting[current_setting_number++].optstr, &opts);        if (ret < 0) {            fprintf(stderr, "The dynamic parameter is wrong\n");            goto fail;        }        /* Set common option. The dictionary will be freed and replaced         * by a new one containing all options not found in common option list.         * Then this new dictionary is used to set private option. */        if ((ret = av_opt_set_dict(avctx, &opts)) < 0)            goto fail;        /* Set codec specific option */        if ((ret = av_opt_set_dict(avctx->priv_data, &opts)) < 0)            goto fail;        /* There is no "framerate" option in commom option list. Use "-r" to set         * framerate, which is compatible with ffmpeg commandline. The video is         * assumed to be average frame rate, so set time_base to 1/framerate. */        e = av_dict_get(opts, "r", NULL, 0);        if (e) {            avctx->framerate = av_d2q(atof(e->value), INT_MAX);            encoder_ctx->time_base = av_inv_q(encoder_ctx->framerate);        }    }fail:    av_dict_free(&opts);    return ret;} static int get_format(AVCodecContext *avctx, const enum AVPixelFormat *pix_fmts){    while (*pix_fmts != AV_PIX_FMT_NONE) {        if (*pix_fmts == AV_PIX_FMT_QSV) {            return AV_PIX_FMT_QSV;        }         pix_fmts++;    }     fprintf(stderr, "The QSV pixel format not offered in get_format()\n");     return AV_PIX_FMT_NONE;} static int open_input_file(char *filename){    int ret;    const 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, NULL, 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;    video = ifmt_ctx->streams[video_stream];     switch(video->codecpar->codec_id) {    case AV_CODEC_ID_H264:        decoder = avcodec_find_decoder_by_name("h264_qsv");        break;    case AV_CODEC_ID_HEVC:        decoder = avcodec_find_decoder_by_name("hevc_qsv");        break;    case AV_CODEC_ID_VP9:        decoder = avcodec_find_decoder_by_name("vp9_qsv");        break;    case AV_CODEC_ID_VP8:        decoder = avcodec_find_decoder_by_name("vp8_qsv");        break;    case AV_CODEC_ID_AV1:        decoder = avcodec_find_decoder_by_name("av1_qsv");        break;    case AV_CODEC_ID_MPEG2VIDEO:        decoder = avcodec_find_decoder_by_name("mpeg2_qsv");        break;    case AV_CODEC_ID_MJPEG:        decoder = avcodec_find_decoder_by_name("mjpeg_qsv");        break;    default:        fprintf(stderr, "Codec is not supportted by qsv\n");        return AVERROR(EINVAL);    }     if (!(decoder_ctx = avcodec_alloc_context3(decoder)))        return AVERROR(ENOMEM);     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->framerate = av_guess_frame_rate(ifmt_ctx, video, NULL);     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_format;    decoder_ctx->pkt_timebase = video->time_base;    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(AVPacket *enc_pkt, AVFrame *frame){    int ret = 0;     av_packet_unref(enc_pkt);     if((ret = dynamic_set_parameter(encoder_ctx)) < 0) {        fprintf(stderr, "Failed to set dynamic parameter. Error code: %s\n",                av_err2str(ret));        goto end;    }     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) {        if (ret = avcodec_receive_packet(encoder_ctx, enc_pkt))            break;        enc_pkt->stream_index = 0;        av_packet_rescale_ts(enc_pkt, encoder_ctx->time_base,                             ofmt_ctx->streams[0]->time_base);        if ((ret = av_interleaved_write_frame(ofmt_ctx, enc_pkt)) < 0) {            fprintf(stderr, "Error during writing data to output file. "                    "Error code: %s\n", av_err2str(ret));            return ret;        }    } end:    if (ret == AVERROR_EOF)        return 0;    ret = ((ret == AVERROR(EAGAIN)) ? 0:-1);    return ret;} static int dec_enc(AVPacket *pkt, const AVCodec *enc_codec, char *optstr){    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 (!encoder_ctx->hw_frames_ctx) {            AVDictionaryEntry *e = NULL;            AVDictionary *opts = NULL;            AVStream *ost;            /* 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.             */            encoder_ctx->time_base = av_inv_q(decoder_ctx->framerate);            encoder_ctx->pix_fmt   = AV_PIX_FMT_QSV;            encoder_ctx->width     = decoder_ctx->width;            encoder_ctx->height    = decoder_ctx->height;            if ((ret = str_to_dict(optstr, &opts)) < 0) {                fprintf(stderr, "Failed to set encoding parameter.\n");                goto fail;            }            /* There is no "framerate" option in commom option list. Use "-r" to            * set framerate, which is compatible with ffmpeg commandline. The            * video is assumed to be average frame rate, so set time_base to            * 1/framerate. */            e = av_dict_get(opts, "r", NULL, 0);            if (e) {                encoder_ctx->framerate = av_d2q(atof(e->value), INT_MAX);                encoder_ctx->time_base = av_inv_q(encoder_ctx->framerate);            }            if ((ret = avcodec_open2(encoder_ctx, enc_codec, &opts)) < 0) {                fprintf(stderr, "Failed to open encode codec. Error code: %s\n",                        av_err2str(ret));                av_dict_free(&opts);                goto fail;            }            av_dict_free(&opts);             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;            }        }        frame->pts = av_rescale_q(frame->pts, decoder_ctx->pkt_timebase,                                  encoder_ctx->time_base);        if ((ret = encode_write(pkt, frame)) < 0)            fprintf(stderr, "Error during encoding and writing.\n"); fail:        av_frame_free(&frame);    }    return ret;} int main(int argc, char **argv){    const AVCodec *enc_codec;    int ret = 0;    AVPacket *dec_pkt = NULL;     if (argc < 5 || (argc - 5) % 2) {        av_log(NULL, AV_LOG_ERROR, "Usage: %s <input file> <encoder> <output file>"               " <\"encoding option set 0\"> [<frame_number> <\"encoding options set 1\">]...\n", argv[0]);        return 1;    }    setting_number = (argc - 5) / 2;    dynamic_setting = av_malloc(setting_number * sizeof(*dynamic_setting));    current_setting_number = 0;    for (int i = 0; i < setting_number; i++) {        dynamic_setting[i].frame_number = atoi(argv[i*2 + 5]);        dynamic_setting[i].optstr = argv[i*2 + 6];    }     ret = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_QSV, NULL, NULL, 0);    if (ret < 0) {        fprintf(stderr, "Failed to create a QSV device. Error code: %s\n", av_err2str(ret));        goto end;    }     dec_pkt = av_packet_alloc();    if (!dec_pkt) {        fprintf(stderr, "Failed to allocate decode packet\n");        goto end;    }     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, argv[4]);         av_packet_unref(dec_pkt);    }     /* flush decoder */    av_packet_unref(dec_pkt);    if ((ret = dec_enc(dec_pkt, enc_codec, argv[4])) < 0) {        fprintf(stderr, "Failed to flush decoder %s\n", av_err2str(ret));        goto end;    }     /* flush encoder */    if ((ret = encode_write(dec_pkt, NULL)) < 0) {        fprintf(stderr, "Failed to flush encoder %s\n", av_err2str(ret));        goto end;    }     /* write the trailer for output stream */    if ((ret = av_write_trailer(ofmt_ctx)) < 0)        fprintf(stderr, "Failed to write trailer %s\n", av_err2str(ret)); 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);    av_packet_free(&dec_pkt);    av_freep(&dynamic_setting);    return ret;}