// Open Media file and return elapsed time in millseconds
int Waveform::OpenfileMedia(AudioManager* media, wxString& error)
{
_media = media;
views.clear();
if (_media != NULL)
{
float samplesPerLine = GetSamplesPerLineFromZoomLevel(mZoomLevel);
WaveView wv(mZoomLevel, samplesPerLine, media);
views.push_back(wv);
mCurrentWaveView = 0;
return media->LengthMS();
}
else
{
return 0;
}
}
void Waveform::SetZoomLevel(int level)
{
mZoomLevel = level;
if(!mIsInitialized){return;}
mCurrentWaveView = NO_WAVE_VIEW_SELECTED;
for(int i=0;i<views.size();i++)
{
if(views[i].GetZoomLevel() == mZoomLevel)
{
mCurrentWaveView = i;
}
}
if (mCurrentWaveView == NO_WAVE_VIEW_SELECTED)
{
float samplesPerLine = GetSamplesPerLineFromZoomLevel(mZoomLevel);
WaveView wv(mZoomLevel,samplesPerLine,m_left_data,mMediaTrackSize);
views.push_back(wv);
mCurrentWaveView = views.size()-1;
}
}
// Open Media file and return elapsed time in millseconds
int Waveform::OpenfileMediaFile(const wxString &filename, wxString& error)
{
mpg123_handle *mh = NULL;
int err;
size_t buffer_size;
int channels, encoding;
long rate;
err = mpg123_init();
if(err != MPG123_OK || (mh = mpg123_new(NULL, &err)) == NULL)
{
error = wxString::Format("Basic setup goes wrong: %s", mpg123_plain_strerror(err));
if (mh != NULL) {
cleanup(mh);
}
return -1;
}
/* open the file and get the decoding format */
if( mpg123_open(mh, filename.c_str()) != MPG123_OK ||
mpg123_getformat(mh, &rate, &channels, &encoding) != MPG123_OK )
{
error = wxString::Format("Trouble with mpg123: %s", mpg123_strerror(mh));
cleanup(mh);
return -1;
}
if( encoding != MPG123_ENC_SIGNED_16 )
{
error = "Encoding unsupported. Must be signed 16 bit.";
cleanup(mh);
return -2;
}
/* set the output format and open the output device */
m_bits = mpg123_encsize(encoding);
m_rate = rate;
m_channels = channels;
/* Get Track Size */
mMediaTrackSize = GetTrackSize(mh,m_bits,m_channels);
buffer_size = mpg123_outblock(mh);
int size = (mMediaTrackSize+buffer_size)*m_bits*m_channels;
char * trackData = (char*)malloc(size);
LoadTrackData(mh,trackData, size);
// Split data into left and right and normalize -1 to 1
m_left_data = (float*)malloc(sizeof(float)*mMediaTrackSize);
if( m_channels == 2 )
{
m_right_data = (float*)malloc(sizeof(float)*mMediaTrackSize);
SplitTrackDataAndNormalize((signed short*)trackData,mMediaTrackSize,m_left_data,m_right_data);
}
else if( m_channels == 1 )
{
NormalizeMonoTrackData((signed short*)trackData,mMediaTrackSize,m_left_data);
}
else
{
error = "More than 2 audio channels is not supported yet.";
}
views.clear();
float samplesPerLine = GetSamplesPerLineFromZoomLevel(mZoomLevel);
WaveView wv(mZoomLevel,samplesPerLine,m_left_data,mMediaTrackSize);
views.push_back(wv);
mCurrentWaveView = 0;
mpg123_close(mh);
mpg123_delete(mh);
mpg123_exit();
free(trackData);
float seconds = (float)mMediaTrackSize * ((float)1/(float)rate);
mAudioIsLoaded = true;
return (int)(seconds * (float)1000);
}
