Beispiel #1
0
void SoundSourceFLAC::flacMetadata(const FLAC__StreamMetadata* metadata) {
    // https://xiph.org/flac/api/group__flac__stream__decoder.html#ga43e2329c15731c002ac4182a47990f85
    // "...one STREAMINFO block, followed by zero or more other metadata blocks."
    // "...by default the decoder only calls the metadata callback for the STREAMINFO block..."
    // "...always before the first audio frame (i.e. write callback)."
    switch (metadata->type) {
    case FLAC__METADATA_TYPE_STREAMINFO:
    {
        const SINT channelCount = metadata->data.stream_info.channels;
        if (isValidChannelCount(channelCount)) {
            if (hasChannelCount()) {
                // already set before -> check for consistency
                if (getChannelCount() != channelCount) {
                    qWarning() << "Unexpected channel count:"
                            << channelCount << " <> " << getChannelCount();
                }
            } else {
                // not set before
                setChannelCount(channelCount);
            }
        } else {
            qWarning() << "Invalid channel count:"
                    << channelCount;
        }
        const SINT samplingRate = metadata->data.stream_info.sample_rate;
        if (isValidSamplingRate(samplingRate)) {
            if (hasSamplingRate()) {
                // already set before -> check for consistency
                if (getSamplingRate() != samplingRate) {
                    qWarning() << "Unexpected sampling rate:"
                            << samplingRate << " <> " << getSamplingRate();
                }
            } else {
                // not set before
                setSamplingRate(samplingRate);
            }
        } else {
            qWarning() << "Invalid sampling rate:"
                    << samplingRate;
        }
        const SINT frameCount = metadata->data.stream_info.total_samples;
        DEBUG_ASSERT(isValidFrameCount(frameCount));
        if (isEmpty()) {
            // not set before
            setFrameCount(frameCount);
        } else {
            // already set before -> check for consistency
            if (getFrameCount() != frameCount) {
                qWarning() << "Unexpected frame count:"
                        << frameCount << " <> " << getFrameCount();
            }
        }
        const unsigned bitsPerSample = metadata->data.stream_info.bits_per_sample;
        DEBUG_ASSERT(kBitsPerSampleDefault != bitsPerSample);
        if (kBitsPerSampleDefault == m_bitsPerSample) {
            // not set before
            m_bitsPerSample = bitsPerSample;
            m_sampleScaleFactor = CSAMPLE_PEAK
                    / CSAMPLE(FLAC__int32(1) << bitsPerSample);
        } else {
            // already set before -> check for consistency
            if (bitsPerSample != m_bitsPerSample) {
                qWarning() << "Unexpected bits per sample:"
                        << bitsPerSample << " <> " << m_bitsPerSample;
            }
        }
        m_maxBlocksize = metadata->data.stream_info.max_blocksize;
        if (0 >= m_maxBlocksize) {
            qWarning() << "Invalid max. blocksize" << m_maxBlocksize;
        }
        const SINT sampleBufferCapacity =
                m_maxBlocksize * getChannelCount();
        m_sampleBuffer.resetCapacity(sampleBufferCapacity);
        break;
    }
    default:
        // Ignore all other metadata types
        break;
    }
}
Beispiel #2
0
void AudioSource::setFrameCount(SINT frameCount) {
    DEBUG_ASSERT(isValidFrameCount(frameCount));
    m_frameCount = frameCount;
}