int opus_decoder_get_size(int channels) { int silkDecSizeBytes, celtDecSizeBytes; int ret; if (channels<1 || channels > 2) return 0; ret = silk_Get_Decoder_Size( &silkDecSizeBytes ); if(ret) return 0; silkDecSizeBytes = align(silkDecSizeBytes); celtDecSizeBytes = celt_decoder_get_size(channels); return align(sizeof(OpusDecoder))+silkDecSizeBytes+celtDecSizeBytes; }
int opus_decoder_init(OpusDecoder *st, opus_int32 Fs, int channels) { void *silk_dec; CELTDecoder *celt_dec; int ret, silkDecSizeBytes; if ((Fs!=48000&&Fs!=24000&&Fs!=16000&&Fs!=12000&&Fs!=8000) || (channels!=1&&channels!=2)) return OPUS_BAD_ARG; OPUS_CLEAR((char*)st, opus_decoder_get_size(channels)); /* Initialize SILK encoder */ ret = silk_Get_Decoder_Size(&silkDecSizeBytes); if (ret) return OPUS_INTERNAL_ERROR; silkDecSizeBytes = align(silkDecSizeBytes); st->silk_dec_offset = align(sizeof(OpusDecoder)); st->celt_dec_offset = st->silk_dec_offset+silkDecSizeBytes; silk_dec = (char*)st+st->silk_dec_offset; celt_dec = (CELTDecoder*)((char*)st+st->celt_dec_offset); st->stream_channels = st->channels = channels; st->Fs = Fs; st->DecControl.API_sampleRate = st->Fs; st->DecControl.nChannelsAPI = st->channels; st->arch = opus_select_arch(); /* Reset decoder */ ret = silk_InitDecoder( silk_dec ); if(ret)return OPUS_INTERNAL_ERROR; /* Initialize CELT decoder */ ret = celt_decoder_init(celt_dec, Fs, channels); if(ret!=OPUS_OK)return OPUS_INTERNAL_ERROR; celt_decoder_ctl(celt_dec, CELT_SET_SIGNALLING(0)); st->prev_mode = 0; st->frame_size = Fs/400; return OPUS_OK; }