void Splicer::pull(AudioChunk &chunk) { Uint32 left = chunk.length(), chans = chunk.format().channels; Sint32 *data[PG_MAX_CHANNELS]; for (Uint32 i = 0; i < chans; ++i) data[i] = chunk.start(i); //Query exhausted each loop to refresh the value of "current". while (!exhausted()) { //Pull data from next stream AudioChunk sub(chunk.scratch(), output, data, left, chunk.sync); current->pull(sub); //Partial advance if (current->exhausted()) { Uint32 cut = sub.cutoff(); for (Uint32 i = 0; i < chans; ++i) data[i] += cut; left -= cut; current = NULL; if (left) continue; } return; } //The Splicer is exhausted! chunk.cutoff(data[0] - chunk.start(0)); }
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));} } }