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));}
}
}
