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#include "framelist.h"
/********************************************************
Audio Tools, a module and set of tools for manipulating audio data
Copyright (C) 2007-2015 Brian Langenberger
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*******************************************************/
#ifndef STANDALONE
PyObject*
open_audiotools_pcm(void)
{
return PyImport_ImportModule("audiotools.pcm");
}
pcm_FrameList*
new_FrameList(PyObject* audiotools_pcm,
unsigned channels,
unsigned bits_per_sample,
unsigned pcm_frames)
{
/*have audiotools.pcm make an empty FrameList for us*/
pcm_FrameList *framelist =
(pcm_FrameList*)empty_FrameList(audiotools_pcm,
channels,
bits_per_sample);
/*then resize it to hold the requested amount of data*/
framelist->frames = pcm_frames;
framelist->samples_length = pcm_frames * framelist->channels;
framelist->samples = realloc(framelist->samples,
sizeof(int) * framelist->samples_length);
return framelist;
}
PyObject*
empty_FrameList(PyObject* audiotools_pcm,
unsigned channels,
unsigned bits_per_sample)
{
return PyObject_CallMethod(
audiotools_pcm,
"empty_framelist", "ii", channels, bits_per_sample);
}
#endif
void
put_channel_data(int *pcm_data,
unsigned channel_number,
unsigned channel_count,
unsigned pcm_frames,
const int *channel_data)
{
pcm_data += channel_number;
for (; pcm_frames; pcm_frames--) {
*pcm_data = *channel_data;
pcm_data += channel_count;
channel_data += 1;
}
}
void
swap_channel_data(int *pcm_data,
unsigned channel_a,
unsigned channel_b,
unsigned channel_count,
unsigned pcm_frames)
{
for (; pcm_frames; pcm_frames--) {
const int c = pcm_data[channel_a];
pcm_data[channel_a] = pcm_data[channel_b];
pcm_data[channel_b] = c;
pcm_data += channel_count;
}
}
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