C++ (Cpp) ff_acelp_vectors_init示例

示例#1

文件： amrnbdec.c 项目： 0xFFeng/ffmpeg

static av_cold int amrnb_decode_init(AVCodecContext *avctx)
{
    AMRContext *p = avctx->priv_data;
    int i;

    if (avctx->channels > 1) {
        avpriv_report_missing_feature(avctx, "multi-channel AMR");
        return AVERROR_PATCHWELCOME;
    }

    avctx->channels       = 1;
    avctx->channel_layout = AV_CH_LAYOUT_MONO;
    if (!avctx->sample_rate)
        avctx->sample_rate = 8000;
    avctx->sample_fmt     = AV_SAMPLE_FMT_FLT;

    // p->excitation always points to the same position in p->excitation_buf
    p->excitation = &p->excitation_buf[PITCH_DELAY_MAX + LP_FILTER_ORDER + 1];

    for (i = 0; i < LP_FILTER_ORDER; i++) {
        p->prev_lsp_sub4[i] =    lsp_sub4_init[i] * 1000 / (float)(1 << 15);
        p->lsf_avg[i] = p->lsf_q[3][i] = lsp_avg_init[i] / (float)(1 << 15);
    }

    for (i = 0; i < 4; i++)
        p->prediction_error[i] = MIN_ENERGY;

    ff_acelp_filter_init(&p->acelpf_ctx);
    ff_acelp_vectors_init(&p->acelpv_ctx);
    ff_celp_filter_init(&p->celpf_ctx);
    ff_celp_math_init(&p->celpm_ctx);

    return 0;
}

示例#2

static av_cold int amrnb_decode_init(AVCodecContext *avctx)
{
    AMRContext *p = avctx->priv_data;
    int i;

    avctx->sample_fmt = AV_SAMPLE_FMT_FLT;

    // p->excitation always points to the same position in p->excitation_buf
    p->excitation = &p->excitation_buf[PITCH_DELAY_MAX + LP_FILTER_ORDER + 1];

    for (i = 0; i < LP_FILTER_ORDER; i++) {
        p->prev_lsp_sub4[i] =    lsp_sub4_init[i] * 1000 / (float)(1 << 15);
        p->lsf_avg[i] = p->lsf_q[3][i] = lsp_avg_init[i] / (float)(1 << 15);
    }

    for (i = 0; i < 4; i++)
        p->prediction_error[i] = MIN_ENERGY;

    avcodec_get_frame_defaults(&p->avframe);
    avctx->coded_frame = &p->avframe;

    ff_acelp_filter_init(&p->acelpf_ctx);
    ff_acelp_vectors_init(&p->acelpv_ctx);
    ff_celp_filter_init(&p->celpf_ctx);
    ff_celp_math_init(&p->celpm_ctx);

    return 0;
}

示例#3

文件： amrwbdec.c 项目： MikeSouza/mpc-hc

static av_cold int amrwb_decode_init(AVCodecContext *avctx)
{
    AMRWBContext *ctx = avctx->priv_data;
    int i;

    avctx->sample_fmt = AV_SAMPLE_FMT_FLT;

    av_lfg_init(&ctx->prng, 1);

    ctx->excitation  = &ctx->excitation_buf[AMRWB_P_DELAY_MAX + LP_ORDER + 1];
    ctx->first_frame = 1;

    for (i = 0; i < LP_ORDER; i++)
        ctx->isf_past_final[i] = isf_init[i] * (1.0f / (1 << 15));

    for (i = 0; i < 4; i++)
        ctx->prediction_error[i] = MIN_ENERGY;

    avcodec_get_frame_defaults(&ctx->avframe);
    avctx->coded_frame = &ctx->avframe;

    ff_acelp_filter_init(&ctx->acelpf_ctx);
    ff_acelp_vectors_init(&ctx->acelpv_ctx);
    ff_celp_filter_init(&ctx->celpf_ctx);
    ff_celp_math_init(&ctx->celpm_ctx);

    return 0;
}

示例#4

文件： amrwbdec.c 项目： markjreed/vice-emu

static av_cold int amrwb_decode_init(AVCodecContext *avctx)
{
    AMRWBContext *ctx = avctx->priv_data;
    int i;

    if (avctx->channels > 1) {
        avpriv_report_missing_feature(avctx, "multi-channel AMR");
        return AVERROR_PATCHWELCOME;
    }

    avctx->channels       = 1;
    avctx->channel_layout = AV_CH_LAYOUT_MONO;
    if (!avctx->sample_rate)
        avctx->sample_rate = 16000;
    avctx->sample_fmt     = AV_SAMPLE_FMT_FLT;

    av_lfg_init(&ctx->prng, 1);

    ctx->excitation  = &ctx->excitation_buf[AMRWB_P_DELAY_MAX + LP_ORDER + 1];
    ctx->first_frame = 1;

    for (i = 0; i < LP_ORDER; i++)
        ctx->isf_past_final[i] = isf_init[i] * (1.0f / (1 << 15));

    for (i = 0; i < 4; i++)
        ctx->prediction_error[i] = MIN_ENERGY;

    ff_acelp_filter_init(&ctx->acelpf_ctx);
    ff_acelp_vectors_init(&ctx->acelpv_ctx);
    ff_celp_filter_init(&ctx->celpf_ctx);
    ff_celp_math_init(&ctx->celpm_ctx);

    return 0;
}