int opus_multistream_decoder_init(
OpusMSDecoder *st,
opus_int32 Fs,
int channels,
int streams,
int coupled_streams,
const unsigned char *mapping
)
{
int coupled_size;
int mono_size;
int i, ret;
char *ptr;
if ((channels>255) || (channels<1) || (coupled_streams>streams) ||
(coupled_streams+streams>255) || (streams<1) || (coupled_streams<0))
return OPUS_BAD_ARG;
st->layout.nb_channels = channels;
st->layout.nb_streams = streams;
st->layout.nb_coupled_streams = coupled_streams;
for (i=0;i<st->layout.nb_channels;i++)
st->layout.mapping[i] = mapping[i];
if (!validate_layout(&st->layout))
return OPUS_BAD_ARG;
ptr = (char*)st + align(sizeof(OpusMSDecoder));
coupled_size = opus_decoder_get_size(2);
mono_size = opus_decoder_get_size(1);
for (i=0;i<st->layout.nb_coupled_streams;i++)
{
ret=opus_decoder_init((OpusDecoder*)ptr, Fs, 2);
if(ret!=OPUS_OK)return ret;
ptr += align(coupled_size);
}
for (;i<st->layout.nb_streams;i++)
{
ret=opus_decoder_init((OpusDecoder*)ptr, Fs, 1);
if(ret!=OPUS_OK)return ret;
ptr += align(mono_size);
}
return OPUS_OK;
}
static int opus_multistream_encoder_init_impl(
OpusMSEncoder *st,
opus_int32 Fs,
int channels,
int streams,
int coupled_streams,
const unsigned char *mapping,
int application,
MappingType mapping_type
)
{
int coupled_size;
int mono_size;
int i, ret;
char *ptr;
if ((channels>255) || (channels<1) || (coupled_streams>streams) ||
(streams<1) || (coupled_streams<0) || (streams>255-coupled_streams))
return OPUS_BAD_ARG;
st->arch = opus_select_arch();
st->layout.nb_channels = channels;
st->layout.nb_streams = streams;
st->layout.nb_coupled_streams = coupled_streams;
if (mapping_type != MAPPING_TYPE_SURROUND)
st->lfe_stream = -1;
st->bitrate_bps = OPUS_AUTO;
st->application = application;
st->variable_duration = OPUS_FRAMESIZE_ARG;
for (i=0;i<st->layout.nb_channels;i++)
st->layout.mapping[i] = mapping[i];
if (!validate_layout(&st->layout) || !validate_encoder_layout(&st->layout))
return OPUS_BAD_ARG;
ptr = (char*)st + align(sizeof(OpusMSEncoder));
coupled_size = opus_encoder_get_size(2);
mono_size = opus_encoder_get_size(1);
for (i=0;i<st->layout.nb_coupled_streams;i++)
{
ret = opus_encoder_init((OpusEncoder*)ptr, Fs, 2, application);
if(ret!=OPUS_OK)return ret;
if (i==st->lfe_stream)
opus_encoder_ctl((OpusEncoder*)ptr, OPUS_SET_LFE(1));
ptr += align(coupled_size);
}
for (;i<st->layout.nb_streams;i++)
{
ret = opus_encoder_init((OpusEncoder*)ptr, Fs, 1, application);
if (i==st->lfe_stream)
opus_encoder_ctl((OpusEncoder*)ptr, OPUS_SET_LFE(1));
if(ret!=OPUS_OK)return ret;
ptr += align(mono_size);
}
if (mapping_type == MAPPING_TYPE_SURROUND)
{
OPUS_CLEAR(ms_get_preemph_mem(st), channels);
OPUS_CLEAR(ms_get_window_mem(st), channels*120);
}
st->mapping_type = mapping_type;
return OPUS_OK;
}
