static av_cold int dnxhd_encode_init(AVCodecContext *avctx)
{
    DNXHDEncContext *ctx = avctx->priv_data;
    int i, index, bit_depth;

    switch (avctx->pix_fmt) {
    case AV_PIX_FMT_YUV422P:
        bit_depth = 8;
        break;
    case AV_PIX_FMT_YUV422P10:
        bit_depth = 10;
        break;
    default:
        av_log(avctx, AV_LOG_ERROR, "pixel format is incompatible with DNxHD\n");
        return -1;
    }

    ctx->cid = ff_dnxhd_find_cid(avctx, bit_depth);
    if (!ctx->cid) {
        av_log(avctx, AV_LOG_ERROR, "video parameters incompatible with DNxHD. Valid DNxHD profiles:\n");
        ff_dnxhd_print_profiles(avctx, AV_LOG_ERROR);
        return -1;
    }
    av_log(avctx, AV_LOG_DEBUG, "cid %d\n", ctx->cid);

    index = ff_dnxhd_get_cid_table(ctx->cid);
    av_assert0(index >= 0);
    ctx->cid_table = &ff_dnxhd_cid_table[index];

    ctx->m.avctx = avctx;
    ctx->m.mb_intra = 1;
    ctx->m.h263_aic = 1;

    avctx->bits_per_raw_sample = ctx->cid_table->bit_depth;

    ff_dct_common_init(&ctx->m);
    ff_dct_encode_init(&ctx->m);

    if (!ctx->m.dct_quantize)
        ctx->m.dct_quantize = ff_dct_quantize_c;

    if (ctx->cid_table->bit_depth == 10) {
       ctx->m.dct_quantize = dnxhd_10bit_dct_quantize;
       ctx->get_pixels_8x4_sym = dnxhd_10bit_get_pixels_8x4_sym;
       ctx->block_width_l2 = 4;
    } else {
       ctx->get_pixels_8x4_sym = dnxhd_8bit_get_pixels_8x4_sym;
       ctx->block_width_l2 = 3;
    }

    if (ARCH_X86)
        ff_dnxhdenc_init_x86(ctx);

    ctx->m.mb_height = (avctx->height + 15) / 16;
    ctx->m.mb_width  = (avctx->width  + 15) / 16;

    if (avctx->flags & CODEC_FLAG_INTERLACED_DCT) {
        ctx->interlaced = 1;
        ctx->m.mb_height /= 2;
    }

    ctx->m.mb_num = ctx->m.mb_height * ctx->m.mb_width;

    if (avctx->intra_quant_bias != FF_DEFAULT_QUANT_BIAS)
        ctx->m.intra_quant_bias = avctx->intra_quant_bias;
    if (dnxhd_init_qmat(ctx, ctx->m.intra_quant_bias, 0) < 0) // XXX tune lbias/cbias
        return -1;

    // Avid Nitris hardware decoder requires a minimum amount of padding in the coding unit payload
    if (ctx->nitris_compat)
        ctx->min_padding = 1600;

    if (dnxhd_init_vlc(ctx) < 0)
        return -1;
    if (dnxhd_init_rc(ctx) < 0)
        return -1;

    FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->slice_size, ctx->m.mb_height*sizeof(uint32_t), fail);
    FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->slice_offs, ctx->m.mb_height*sizeof(uint32_t), fail);
    FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->mb_bits,    ctx->m.mb_num   *sizeof(uint16_t), fail);
    FF_ALLOCZ_OR_GOTO(ctx->m.avctx, ctx->mb_qscale,  ctx->m.mb_num   *sizeof(uint8_t),  fail);

    avctx->coded_frame = av_frame_alloc();
    if (!avctx->coded_frame)
        return AVERROR(ENOMEM);

    avctx->coded_frame->key_frame = 1;
    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;

    if (avctx->thread_count > MAX_THREADS) {
        av_log(avctx, AV_LOG_ERROR, "too many threads\n");
        return -1;
    }

    ctx->thread[0] = ctx;
    for (i = 1; i < avctx->thread_count; i++) {
        ctx->thread[i] =  av_malloc(sizeof(DNXHDEncContext));
        memcpy(ctx->thread[i], ctx, sizeof(DNXHDEncContext));
    }

    return 0;
 fail: //for FF_ALLOCZ_OR_GOTO
    return -1;
}
Unknown