diff options
Diffstat (limited to 'src/audiofile.cc')
-rw-r--r-- | src/audiofile.cc | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/src/audiofile.cc b/src/audiofile.cc index 455bab0..05b356a 100644 --- a/src/audiofile.cc +++ b/src/audiofile.cc @@ -23,6 +23,8 @@ * You should have received a copy of the GNU General Public License * along with DrumGizmo; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + * + * Multichannel feature by John Hammen copyright 2014 */ #include "audiofile.h" @@ -39,10 +41,11 @@ #include <config.h> -AudioFile::AudioFile(std::string filename) +AudioFile::AudioFile(std::string filename, int filechannel) { is_loaded = false; this->filename = filename; + this->filechannel = filechannel; data = NULL; size = 0; @@ -91,6 +94,8 @@ void AudioFile::unload() #endif/*LAZYLOAD*/ } +#define BUFFER_SIZE 4092 + void AudioFile::load(int num_samples) { // Make sure we don't unload the object while loading it... @@ -123,7 +128,27 @@ void AudioFile::load(int num_samples) } sample_t* data = new sample_t[size]; - size = sf_read_float(fh, data, size); + if(sf_info.channels == 1) { + size = sf_read_float(fh, data, size); + } + else { + // check filechannel exists + if(filechannel >= sf_info.channels) { + filechannel = sf_info.channels - 1; + } + sample_t buffer[BUFFER_SIZE]; + int readsize = BUFFER_SIZE / sf_info.channels; + int totalread = 0; + int read; + do { + read = sf_readf_float(fh, buffer, readsize); + for (int i = 0; i < read; i++) { + data[totalread++] = buffer[i * sf_info.channels + filechannel]; + } + } while(read > 0 && totalread < (int)size); + // set data size to total bytes read + size = totalread; + } DEBUG(audiofile,"Loaded %d samples %p\n", (int)size, this); |