void Signal::pull(AudioChunk &chunk) const { if (!data) {chunk.silence(); return;} if (data->trans) data->trans->pull(chunk); else data->stream->pull(chunk); }
virtual void pull(AudioChunk &chunk) { if (!chunk.length()) return; if (!valid || finished) {chunk.silence(); return;} int samples, have = 0, need = chunk.length(); //Create pointers to 16-bit data short *d16[PG_MAX_CHANNELS]; for (Uint32 i = 0; i < chunk.format().channels; ++i) d16[i] = (short*) chunk.start(i); while (true) { samples = stb_vorbis_get_samples_short(ogg, chunk.format().channels, d16, (need-have)); if (samples < 0) { finished = true; //cout << " VORBIS ERROR" << endl; break; } if (samples == 0) { //File's end if (loop) { stb_vorbis_seek_start(ogg); continue; } else { finished = true; break; } } for (Uint32 i=0; i < chunk.format().channels; ++i) d16[i] += samples; have += samples; //if (have > need) cout << "VORBIS OVERDRAW" << endl; //std::cout << "OGG pull: " << have << "/" << need << std::endl; if (have >= need) break; } //Cutoff marker if necessary if (have < need) chunk.cutoff(have); //Upsample data to 24-bit Sint32s for (Uint32 i=0; i < chunk.format().channels; ++i) { Sint32 *start = chunk.start(i), *op = start + have; short *ip = d16[i]; while (op!=start) {*(--op) = 256 * Sint32(*(--ip));} } }
virtual void pull(AudioChunk &chunk) { //This is possible at startup; race conditions are bad. if (!back) chunk.silence(); //Shorthand. Uint32 frame = back->mikeFrame, length = back->mikeLength; const Sint32 *data = back->mikeData; //How much information is available? if (readFrame != frame) {readFrame = frame; prog = 0;} Uint32 want = chunk.length(), get = std::min(length-prog, want); //Read what we can from the buffer std::memcpy((void*)chunk.start(0), (const void*)(data+prog), 4*get); prog += get; //Fill your cup too full and it will spill... if (get < want) std::memset((void*)(chunk.start(0)+get), 0, 4*(want-get)); }