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));
}
