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;
int i;
pcm_FrameList *framelist = new_FrameList(self->audiotools_pcm,
channel_count,
BITS_PER_SAMPLE,
pcm_frames_read);
int *samples = framelist->samples;
for (i = 0; i < pcm_frames_read * channel_count; i++) {
samples[i] = pcm[i];
}
/*reorder channels to .wav order if necessary*/
switch (self->channel_count) {
case 1:
case 2:
default:
/*no change*/
break;
case 3:
/*fL fC fR -> fL fR fC*/
swap_channel_data(samples, 1, 2,
self->channel_count,
(unsigned)pcm_frames_read);
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*/
swap_channel_data(samples, 1, 2,
self->channel_count,
(unsigned)pcm_frames_read);
break;
case 6:
/*fL fC fR bL bR LFE -> fL fR fC bL bR LFE*/
swap_channel_data(samples, 1, 2,
self->channel_count,
(unsigned)pcm_frames_read);
/*fL fR fC bL bR LFE -> fL fR fC LFE bR bL*/
swap_channel_data(samples, 3, 5,
self->channel_count,
(unsigned)pcm_frames_read);
/*fL fR fC LFE bR bL -> fL fR fC LFE bL bR*/
swap_channel_data(samples, 4, 5,
self->channel_count,
(unsigned)pcm_frames_read);
break;
case 7:
/*fL fC fR sL sR bC LFE -> fL fR fC sL sR bC LFE*/
swap_channel_data(samples, 1, 2,
self->channel_count,
(unsigned)pcm_frames_read);
/*fL fR fC sL sR bC LFE -> fL fR fC LFE sR bC sL*/
swap_channel_data(samples, 3, 6,
self->channel_count,
(unsigned)pcm_frames_read);
/*fL fR fC LFE sR bC sL -> fL fR fC LFE bC sR sL*/
swap_channel_data(samples, 4, 5,
self->channel_count,
(unsigned)pcm_frames_read);
/*fL fR fC LFE bC sR sL -> fL fR fC LFE bC sL sR*/
swap_channel_data(samples, 5, 6,
self->channel_count,
(unsigned)pcm_frames_read);
break;
case 8:
/*fL fC fR sL sR bL bR LFE -> fL fR fC sL sR bL bR LFE*/
swap_channel_data(samples, 1, 2,
self->channel_count,
(unsigned)pcm_frames_read);
/*fL fR fC sL sR bL bR LFE -> fL fR fC LFE sR bL bR sL*/
swap_channel_data(samples, 3, 6,
self->channel_count,
(unsigned)pcm_frames_read);
/*fL fR fC LFE sR bL bR sL -> fL fR fC LFE bL sR bR sL*/
swap_channel_data(samples, 4, 5,
self->channel_count,
(unsigned)pcm_frames_read);
/*fL fR fC LFE bL sR bR sL -> fL fR fC LFE bL bR sR sL*/
swap_channel_data(samples, 5, 6,
self->channel_count,
(unsigned)pcm_frames_read);
/*fL fR fC LFE bL bR sR sL -> fL fR fC LFE bL bR sL sR*/
swap_channel_data(samples, 6, 7,
self->channel_count,
(unsigned)pcm_frames_read);
break;
}
return (PyObject*)framelist;
} else {
/*some sort of read error occurred*/
PyErr_SetString(PyExc_ValueError, "error reading from file");
return NULL;
}
}
static void
reorder_channels(unsigned channel_mask, unsigned pcm_frames, int *samples)
{
/*reorder channels if necessary based on assignment*/
switch (channel_mask) {
default:
break;
case (fL | fR | fC):
/*fL fR fC -> fL fC fR*/
swap_channel_data(samples, 1, 2, 3, pcm_frames);
break;
case (fL | fR | bL | bR):
/*fL fR bL bR -> fL fR bL bR*/
/*no change*/
break;
case (fL | fR | fC | bL | bR):
/*fL fR fC bL bR -> fL fC fR bL bR*/
swap_channel_data(samples, 1, 2, 5, pcm_frames);
break;
case (fL | fR | fC | LFE | bL | bR):
/*fL fR fC LFE bL bR -> fL fR fC LFE bR bL*/
swap_channel_data(samples, 4, 5, 6, pcm_frames);
/*fL fR fC LFE bR bL -> fL fR fC bL bR LFE*/
swap_channel_data(samples, 3, 5, 6, pcm_frames);
/*fL fR fC bL bR LFE -> fL fC fR bL bR LFE*/
swap_channel_data(samples, 1, 2, 6, pcm_frames);
break;
case (fL | fR | fC | LFE | bC | sL | sR):
/*fL fR fC LFE bC sL sR -> fL fR fC LFE bC sR sL*/
swap_channel_data(samples, 5, 6, 7, pcm_frames);
/*fL fR fC LFE bC sR sL -> fL fR fC LFE sR bC sL*/
swap_channel_data(samples, 4, 5, 7, pcm_frames);
/*fL fR fC LFE sR bC sL -> fL fR fC sL sR bC LFE*/
swap_channel_data(samples, 3, 6, 7, pcm_frames);
/*fL fR fC sL sR bC LFE -> fL fC fR sL sR bC LFE*/
swap_channel_data(samples, 1, 2, 7, pcm_frames);
break;
case (fL | fR | fC | LFE | bL | bR | sL | sR):
/*fL fR fC LFE bL bR sL sR -> fL fR fC LFE bL bR sR sL*/
swap_channel_data(samples, 6, 7, 8, pcm_frames);
/*fL fR fC LFE bL bR sR sL -> fL fR fC LFE bL sR bR sL*/
swap_channel_data(samples, 5, 6, 8, pcm_frames);
/*fL fR fC LFE bL sR bR sL -> fL fR fC LFE sR bL bR sL*/
swap_channel_data(samples, 4, 5, 8, pcm_frames);
/*fL fR fC LFE sR bL bR sL -> fL fR fC sL sR bL bR LFE*/
swap_channel_data(samples, 3, 6, 8, pcm_frames);
/*fL fR fC sL sR bL bR LFE -> fL fC fR sL sR bL bR LFE*/
swap_channel_data(samples, 1, 2, 8, pcm_frames);
break;
}
}
static PyObject*
VorbisDecoder_read(decoders_VorbisDecoder *self, PyObject *args) {
int current_bitstream;
long samples_read;
float **pcm_channels;
if (self->closed) {
PyErr_SetString(PyExc_ValueError, "stream is closed");
return NULL;
}
samples_read = ov_read_float(&(self->vorbisfile),
&pcm_channels,
4096,
¤t_bitstream);
if (samples_read >= 0) {
/*convert floating point samples to integer-based ones*/
pcm_FrameList *framelist;
int *samples;
int c;
if (samples_read == 0) {
if (self->vorbisfile.os.e_o_s == 0) {
/*EOF encountered without EOF being marked in stream*/
PyErr_SetString(PyExc_IOError,
"I/O error reading from Ogg stream");
return NULL;
} else {
return empty_FrameList(self->audiotools_pcm,
self->channel_count,
BITS_PER_SAMPLE);
}
}
framelist = new_FrameList(self->audiotools_pcm,
self->channel_count,
BITS_PER_SAMPLE,
(unsigned)samples_read);
samples = framelist->samples;
for (c = 0; c < self->channel_count; c++) {
int channel[samples_read];
float_to_int_converter(BITS_PER_SAMPLE)(
(unsigned)samples_read,
pcm_channels[c],
channel);
put_channel_data(samples,
c,
self->channel_count,
(unsigned)samples_read,
channel);
}
/*reorder channels to .wav order if necessary*/
switch (self->channel_count) {
case 1:
case 2:
default:
/*no change*/
break;
case 3:
/*fL fC fR -> fL fR fC*/
swap_channel_data(samples, 1, 2,
self->channel_count, (unsigned)samples_read);
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*/
swap_channel_data(samples, 1, 2,
self->channel_count, (unsigned)samples_read);
break;
case 6:
/*fL fC fR bL bR LFE -> fL fR fC bL bR LFE*/
swap_channel_data(samples, 1, 2,
self->channel_count, (unsigned)samples_read);
/*fL fR fC bL bR LFE -> fL fR fC LFE bR bL*/
swap_channel_data(samples, 3, 5,
self->channel_count, (unsigned)samples_read);
/*fL fR fC LFE bR bL -> fL fR fC LFE bL bR*/
swap_channel_data(samples, 4, 5,
self->channel_count, (unsigned)samples_read);
break;
case 7:
/*fL fC fR sL sR bC LFE -> fL fR fC sL sR bC LFE*/
swap_channel_data(samples, 1, 2,
self->channel_count, (unsigned)samples_read);
/*fL fR fC sL sR bC LFE -> fL fR fC LFE sR bC sL*/
swap_channel_data(samples, 3, 6,
self->channel_count, (unsigned)samples_read);
/*fL fR fC LFE sR bC sL -> fL fR fC LFE bC sR sL*/
swap_channel_data(samples, 4, 5,
self->channel_count, (unsigned)samples_read);
/*fL fR fC LFE bC sR sL -> fL fR fC LFE bC sL sR*/
swap_channel_data(samples, 5, 6,
self->channel_count, (unsigned)samples_read);
break;
case 8:
/*fL fC fR sL sR bL bR LFE -> fL fR fC sL sR bL bR LFE*/
swap_channel_data(samples, 1, 2,
self->channel_count, (unsigned)samples_read);
/*fL fR fC sL sR bL bR LFE -> fL fR fC LFE sR bL bR sL*/
swap_channel_data(samples, 3, 6,
self->channel_count, (unsigned)samples_read);
/*fL fR fC LFE sR bL bR sL -> fL fR fC LFE bL sR bR sL*/
swap_channel_data(samples, 4, 5,
self->channel_count, (unsigned)samples_read);
/*fL fR fC LFE bL sR bR sL -> fL fR fC LFE bL bR sR sL*/
swap_channel_data(samples, 5, 6,
self->channel_count, (unsigned)samples_read);
/*fL fR fC LFE bL bR sR sL -> fL fR fC LFE bL bR sL sR*/
swap_channel_data(samples, 6, 7,
self->channel_count, (unsigned)samples_read);
break;
}
return (PyObject*)framelist;
} else {
switch (samples_read) {
case OV_HOLE:
PyErr_SetString(PyExc_ValueError, "data interruption detected");
return NULL;
case OV_EBADLINK:
PyErr_SetString(PyExc_ValueError, "invalid stream section");
return NULL;
case OV_EINVAL:
PyErr_SetString(PyExc_ValueError, "initial file headers corrupt");
return NULL;
default:
PyErr_SetString(PyExc_ValueError, "unspecified error");
return NULL;
}
}
}
