Function process_subframes_

choc/audio/choc_AudioFileFormat_FLAC.h:15363–15605

}

FLAC__bool process_subframes_(FLAC__StreamEncoder *encoder, FLAC__bool is_fractional_block)
{
    FLAC__FrameHeader frame_header;
    unsigned channel, min_partition_order = encoder->protected_->min_residual_partition_order, max_partition_order;
    FLAC__bool do_independent, do_mid_side;

    /*
     * Calculate the min,max Rice partition orders
     */
    if(is_fractional_block) {
        max_partition_order = 0;
    }
    else {
        max_partition_order = FLAC__format_get_max_rice_partition_order_from_blocksize(encoder->protected_->blocksize);
        max_partition_order = std::min(max_partition_order, encoder->protected_->max_residual_partition_order);
    }
    min_partition_order = std::min(min_partition_order, max_partition_order);

    /*
     * Setup the frame
     */
    frame_header.blocksize = encoder->protected_->blocksize;
    frame_header.sample_rate = encoder->protected_->sample_rate;
    frame_header.channels = encoder->protected_->channels;
    frame_header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; /* the default unless the encoder determines otherwise */
    frame_header.bits_per_sample = encoder->protected_->bits_per_sample;
    frame_header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER;
    frame_header.number.frame_number = encoder->private_->current_frame_number;

    /*
     * Figure out what channel assignments to try
     */
    if(encoder->protected_->do_mid_side_stereo) {
        if(encoder->protected_->loose_mid_side_stereo) {
            if(encoder->private_->loose_mid_side_stereo_frame_count == 0) {
                do_independent = true;
                do_mid_side = true;
            }
            else {
                do_independent = (encoder->private_->last_channel_assignment == FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT);
                do_mid_side = !do_independent;
            }
        }
        else {
            do_independent = true;
            do_mid_side = true;
        }
    }
    else {
        do_independent = true;
        do_mid_side = false;
    }

    CHOC_ASSERT(do_independent || do_mid_side);

    /*
     * Check for wasted bits; set effective bps for each subframe
     */