OpusMSDecoder *opus_multistream_decoder_create(
opus_int32 Fs,
int channels,
int streams,
int coupled_streams,
const unsigned char *mapping,
int *error
)
{
int ret;
OpusMSDecoder *st;
if ((channels>255) || (channels<1) || (coupled_streams>streams) ||
(coupled_streams+streams>255) || (streams<1) || (coupled_streams<0))
{
if (error)
*error = OPUS_BAD_ARG;
return NULL;
}
st = (OpusMSDecoder *)opus_alloc(opus_multistream_decoder_get_size(streams, coupled_streams));
if (st==NULL)
{
if (error)
*error = OPUS_ALLOC_FAIL;
return NULL;
}
ret = opus_multistream_decoder_init(st, Fs, channels, streams, coupled_streams, mapping);
if (error)
*error = ret;
if (ret != OPUS_OK)
{
opus_free(st);
st = NULL;
}
return st;
}
FOpusDecoderWrapper(uint16 SampleRate, uint8 NumChannels)
{
#if WITH_OPUS
check(NumChannels <= 8);
const UnrealChannelLayout& Layout = UnrealMappings[NumChannels-1];
#if USE_UE4_MEM_ALLOC
int32 DecSize = opus_multistream_decoder_get_size(Layout.NumStreams, Layout.NumCoupledStreams);
Decoder = (OpusMSDecoder*)FMemory::Malloc(DecSize);
DecError = opus_multistream_decoder_init(Decoder, SampleRate, NumChannels, Layout.NumStreams, Layout.NumCoupledStreams, Layout.Mapping);
#else
Decoder = opus_multistream_decoder_create(SampleRate, NumChannels, Layout.NumStreams, Layout.NumCoupledStreams, Layout.Mapping, &DecError);
#endif
#endif
}
int opus_projection_decoder_init(OpusProjectionDecoder *st, opus_int32 Fs,
int channels, int streams, int coupled_streams,
unsigned char *demixing_matrix, opus_int32 demixing_matrix_size)
{
int nb_input_streams;
opus_int32 expected_matrix_size;
int i, ret;
unsigned char mapping[255];
VARDECL(opus_int16, buf);
ALLOC_STACK;
/* Verify supplied matrix size. */
nb_input_streams = streams + coupled_streams;
expected_matrix_size = nb_input_streams * channels * sizeof(opus_int16);
if (expected_matrix_size != demixing_matrix_size)
{
RESTORE_STACK;
return OPUS_BAD_ARG;
}
/* Convert demixing matrix input into internal format. */
ALLOC(buf, nb_input_streams * channels, opus_int16);
for (i = 0; i < nb_input_streams * channels; i++)
{
int s = demixing_matrix[2*i + 1] << 8 | demixing_matrix[2*i];
s = ((s & 0xFFFF) ^ 0x8000) - 0x8000;
buf[i] = (opus_int16)s;
}
/* Assign demixing matrix. */
st->demixing_matrix_size_in_bytes =
mapping_matrix_get_size(channels, nb_input_streams);
if (!st->demixing_matrix_size_in_bytes)
{
RESTORE_STACK;
return OPUS_BAD_ARG;
}
mapping_matrix_init(get_demixing_matrix(st), channels, nb_input_streams, 0,
buf, demixing_matrix_size);
/* Set trivial mapping so each input channel pairs with a matrix column. */
for (i = 0; i < channels; i++)
mapping[i] = i;
ret = opus_multistream_decoder_init(
get_multistream_decoder(st), Fs, channels, streams, coupled_streams, mapping);
RESTORE_STACK;
return ret;
}
