static void
reorder_channels(unsigned channel_mask, aa_int *samples)
{
/*reorder channels if necessary based on assignment*/
switch (channel_mask) {
default:
break;
case (0x1 | 0x2 | 0x4):
/*fL fR fC -> fL fC fR*/
a_int_swap(samples->_[1], samples->_[2]);
break;
case (0x1 | 0x2 | 0x10 | 0x20):
/*fL fR bL bR -> fL fR bL bR*/
/*no change*/
break;
case (0x1 | 0x2 | 0x4 | 0x10 | 0x20):
/*fL fR fC bL bR -> fL fC fR bL bR*/
a_int_swap(samples->_[1], samples->_[2]);
break;
case (0x1 | 0x2 | 0x4 | 0x8 | 0x10 | 0x20):
/*fL fR fC LFE bL bR -> fL fR fC LFE bR bL*/
a_int_swap(samples->_[4], samples->_[5]);
/*fL fR fC LFE bR bL -> fL fR fC bL bR LFE*/
a_int_swap(samples->_[3], samples->_[5]);
/*fL fR fC bL bR LFE -> fL fC fR bL bR LFE*/
a_int_swap(samples->_[1], samples->_[2]);
break;
case (0x1 | 0x2 | 0x4 | 0x8 | 0x100 | 0x200 | 0x400):
/*fL fR fC LFE bC sL sR -> fL fR fC LFE bC sR sL*/
a_int_swap(samples->_[5], samples->_[6]);
/*fL fR fC LFE bC sR sL -> fL fR fC LFE sR bC sL*/
a_int_swap(samples->_[4], samples->_[5]);
/*fL fR fC LFE sR bC sL -> fL fR fC sL sR bC LFE*/
a_int_swap(samples->_[3], samples->_[6]);
/*fL fR fC sL sR bC LFE -> fL fC fR sL sR bC LFE*/
a_int_swap(samples->_[1], samples->_[2]);
break;
case (0x1 | 0x2 | 0x4 | 0x8 | 0x10 | 0x20 | 0x200 | 0x400):
/*fL fR fC LFE bL bR sL sR -> fL fR fC LFE bL bR sR sL*/
a_int_swap(samples->_[6], samples->_[7]);
/*fL fR fC LFE bL bR sR sL -> fL fR fC LFE bL sR bR sL*/
a_int_swap(samples->_[5], samples->_[6]);
/*fL fR fC LFE bL sR bR sL -> fL fR fC LFE sR bL bR sL*/
a_int_swap(samples->_[4], samples->_[5]);
/*fL fR fC LFE sR bL bR sL -> fL fR fC sL sR bL bR LFE*/
a_int_swap(samples->_[3], samples->_[6]);
/*fL fR fC sL sR bL bR LFE -> fL fC fR sL sR bL bR LFE*/
a_int_swap(samples->_[1], samples->_[2]);
break;
}
}
/*the OpusDecoder.read() method*/
static PyObject*
OpusDecoder_read(decoders_OpusDecoder* self, PyObject *args)
{
static opus_int16 pcm[BUF_SIZE];
int pcm_frames_read;
if (self->closed) {
PyErr_SetString(PyExc_ValueError, "stream is closed");
return NULL;
}
if ((pcm_frames_read = op_read(self->opus_file,
pcm,
BUF_SIZE,
NULL)) >= 0) {
const int channel_count = op_head(self->opus_file, -1)->channel_count;
aa_int *channels = self->channels;
int c;
channels->reset(channels);
/*split buffer by channel*/
for (c = 0; c < channel_count; c++) {
a_int *channel = channels->append(channels);
int i;
channel->resize(channel, pcm_frames_read);
for (i = 0; i < pcm_frames_read; i++) {
a_append(channel, pcm[c + (i * channel_count)]);
}
}
/*reorder channels to .wav order if necessary*/
switch (channel_count) {
case 1:
case 2:
default:
/*no change*/
break;
case 3:
/*fL fC fR -> fL fR fC*/
a_int_swap(channels->_[1], channels->_[2]);
break;
case 4:
/*fL fR bL bR -> fL fR bL bR*/
/*no change*/
break;
case 5:
/*fL fC fR bL bR -> fL fR fC bL bR*/
a_int_swap(channels->_[1], channels->_[2]);
break;
case 6:
/*fL fC fR bL bR LFE -> fL fR fC bL bR LFE*/
a_int_swap(channels->_[1], channels->_[2]);
/*fL fR fC bL bR LFE -> fL fR fC LFE bR bL*/
a_int_swap(channels->_[3], channels->_[5]);
/*fL fR fC LFE bR bL -> fL fR fC LFE bL bR*/
a_int_swap(channels->_[4], channels->_[5]);
break;
case 7:
/*fL fC fR sL sR bC LFE -> fL fR fC sL sR bC LFE*/
a_int_swap(channels->_[1], channels->_[2]);
/*fL fR fC sL sR bC LFE -> fL fR fC LFE sR bC sL*/
a_int_swap(channels->_[3], channels->_[6]);
/*fL fR fC LFE sR bC sL -> fL fR fC LFE bC sR sL*/
a_int_swap(channels->_[4], channels->_[5]);
/*fL fR fC LFE bC sR sL -> fL fR fC LFE bC sL sR*/
a_int_swap(channels->_[5], channels->_[6]);
break;
case 8:
/*fL fC fR sL sR bL bR LFE -> fL fR fC sL sR bL bR LFE*/
a_int_swap(channels->_[1], channels->_[2]);
/*fL fR fC sL sR bL bR LFE -> fL fR fC LFE sR bL bR sL*/
a_int_swap(channels->_[3], channels->_[6]);
/*fL fR fC LFE sR bL bR sL -> fL fR fC LFE bL sR bR sL*/
a_int_swap(channels->_[4], channels->_[5]);
/*fL fR fC LFE bL sR bR sL -> fL fR fC LFE bL bR sR sL*/
a_int_swap(channels->_[5], channels->_[6]);
/*fL fR fC LFE bL bR sR sL -> fL fR fC LFE bL bR sL sR*/
a_int_swap(channels->_[6], channels->_[7]);
break;
}
/*return new FrameList object*/
return aa_int_to_FrameList(self->audiotools_pcm,
channels,
16);
} else {
/*some sort of read error occurred*/
PyErr_SetString(PyExc_ValueError, "error reading from file");
return NULL;
}
}
