Function flac_encode_init

libavcodec/flacenc.c:270–476

static av_cold int flac_encode_init(AVCodecContext *avctx)
{
    int freq = avctx->sample_rate;
    int channels = avctx->ch_layout.nb_channels;
    FlacEncodeContext *s = avctx->priv_data;
    int i, level, ret;
    uint8_t *streaminfo;

    s->avctx = avctx;

    switch (avctx->sample_fmt) {
    case AV_SAMPLE_FMT_S16:
        avctx->bits_per_raw_sample = 16;
        s->bps_code                = 4;
        break;
    case AV_SAMPLE_FMT_S32:
        if (avctx->bits_per_raw_sample <= 24) {
            if (avctx->bits_per_raw_sample < 24)
                av_log(avctx, AV_LOG_WARNING, "encoding as 24 bits-per-sample\n");
            avctx->bits_per_raw_sample = 24;
            s->bps_code                = 6;
        } else if (avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
            av_log(avctx, AV_LOG_WARNING,
                   "encoding as 24 bits-per-sample, more is considered "
                   "experimental. Add -strict experimental if you want "
                   "to encode more than 24 bits-per-sample\n");
            avctx->bits_per_raw_sample = 24;
            s->bps_code                = 6;
        } else {
            avctx->bits_per_raw_sample = 32;
            s->bps_code = 7;
        }
        break;
    }

    if (channels < 1 || channels > FLAC_MAX_CHANNELS) {
        av_log(avctx, AV_LOG_ERROR, "%d channels not supported (max %d)\n",
               channels, FLAC_MAX_CHANNELS);
        return AVERROR(EINVAL);
    }
    s->channels = channels;

    /* find samplerate in table */
    if (freq < 1)
        return AVERROR(EINVAL);
    for (i = 1; i < 12; i++) {
        if (freq == ff_flac_sample_rate_table[i]) {
            s->samplerate = ff_flac_sample_rate_table[i];
            s->sr_code[0] = i;
            s->sr_code[1] = 0;
            break;
        }
    }
    /* if not in table, samplerate is non-standard */
    if (i == 12) {
        if (freq % 1000 == 0 && freq < 255000) {
            s->sr_code[0] = 12;
            s->sr_code[1] = freq / 1000;