Esempio n. 1
0
void Audio_Stream::seekToTime(unsigned newSeekTime)
{
    unsigned duration = durationInSeconds();
    if (!(duration > 0)) {
        return;
    }
    
    close();
    
    setState(SEEKING);
    
    HTTP_Stream_Position position;
    double offset = (double)newSeekTime / (double)duration;
    position.start = m_dataOffset + offset * (contentLength() - m_dataOffset);
    position.end = contentLength();
    
    m_seekTime = newSeekTime;
    
    if (m_httpStream->open(position)) {
        AS_TRACE("%s: HTTP stream opened, buffering...\n", __PRETTY_FUNCTION__);
        m_httpStreamRunning = true;
    } else {
        AS_TRACE("%s: failed to open the HTTP stream\n", __PRETTY_FUNCTION__);
        setState(FAILED);
    }
}
Esempio n. 2
0
void Audio_Stream::seekToTime(unsigned newSeekTime)
{
    unsigned duration = durationInSeconds();
    if (!(duration > 0)) {
        return;
    }
    
    if (state() == SEEKING) {
        return;
    } else {
        setState(SEEKING);
    }
    
    m_seekTime = newSeekTime;
    
    double offset = (double)newSeekTime / (double)duration;
    UInt64 seekByteOffset = m_dataOffset + offset * (contentLength() - m_dataOffset);
    
    HTTP_Stream_Position position;

    position.start = seekByteOffset;
    position.end = contentLength();
    
    double packetDuration = m_srcFormat.mFramesPerPacket / m_srcFormat.mSampleRate;
    
    if (packetDuration > 0 && bitrate() > 0) {
        UInt32 ioFlags = 0;
        SInt64 packetAlignedByteOffset;
        SInt64 seekPacket = floor((double)newSeekTime / packetDuration);
        
        OSStatus err = AudioFileStreamSeek(m_audioFileStream, seekPacket, &packetAlignedByteOffset, &ioFlags);
        if (!err) {
            position.start = packetAlignedByteOffset + m_dataOffset;
        }
    }
    
    close();
    
    AS_TRACE("Seeking position %llu\n", position.start);
    
    if (m_httpStream->open(position)) {
        AS_TRACE("%s: HTTP stream opened, buffering...\n", __PRETTY_FUNCTION__);
        m_httpStreamRunning = true;
    } else {
        AS_TRACE("%s: failed to open the fHTTP stream\n", __PRETTY_FUNCTION__);
        setState(FAILED);
    }
}