Function ff_mpv_encode_init

libavcodec/mpegvideo_enc.c:553–1086

init video encoder */

/* init video encoder */
av_cold int ff_mpv_encode_init(AVCodecContext *avctx)
{
    MPVMainEncContext *const m = avctx->priv_data;
    MPVEncContext    *const s = &m->s;
    AVCPBProperties *cpb_props;
    int gcd, ret;

    mpv_encode_defaults(m);

    switch (avctx->pix_fmt) {
    case AV_PIX_FMT_YUVJ444P:
    case AV_PIX_FMT_YUV444P:
        s->c.chroma_format = CHROMA_444;
        break;
    case AV_PIX_FMT_YUVJ422P:
    case AV_PIX_FMT_YUV422P:
        s->c.chroma_format = CHROMA_422;
        break;
    default:
        av_unreachable("Already checked via CODEC_PIXFMTS");
    case AV_PIX_FMT_YUVJ420P:
    case AV_PIX_FMT_YUV420P:
        s->c.chroma_format = CHROMA_420;
        break;
    }

    avctx->bits_per_raw_sample = av_clip(avctx->bits_per_raw_sample, 0, 8);

    m->bit_rate = avctx->bit_rate;
    s->c.width  = avctx->width;
    s->c.height = avctx->height;
    if (avctx->gop_size > 600 &&
        avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
        av_log(avctx, AV_LOG_WARNING,
               "keyframe interval too large!, reducing it from %d to %d\n",
               avctx->gop_size, 600);
        avctx->gop_size = 600;
    }
    m->gop_size     = avctx->gop_size;
    s->c.avctx      = avctx;
    if (avctx->max_b_frames > MPVENC_MAX_B_FRAMES) {
        av_log(avctx, AV_LOG_ERROR, "Too many B-frames requested, maximum "
               "is " AV_STRINGIFY(MPVENC_MAX_B_FRAMES) ".\n");
        avctx->max_b_frames = MPVENC_MAX_B_FRAMES;
    } else if (avctx->max_b_frames < 0) {
        av_log(avctx, AV_LOG_ERROR,
               "max b frames must be 0 or positive for mpegvideo based encoders\n");
        return AVERROR(EINVAL);
    }
    m->max_b_frames = avctx->max_b_frames;
    s->c.codec_id   = avctx->codec->id;
    if (m->max_b_frames && !(avctx->codec->capabilities & AV_CODEC_CAP_DELAY)) {
        av_log(avctx, AV_LOG_ERROR, "B-frames not supported by codec\n");
        return AVERROR(EINVAL);
    }

    s->c.quarter_sample     = (avctx->flags & AV_CODEC_FLAG_QPEL) != 0;
    s->rtp_mode           = !!s->rtp_payload_size;