/**
* Specify data to be filled into a looping buffer.
* This takes the current position at the time of the
* call, and returns the number of samples written.
*
* FIXME: this version is not as stingy about memory as
* it could be.
*
* FIXME: move convert to the bottom of the testing, so
* that only as much data as is being used will be
* converted.
*
* FIXME: mostly untested
*
* FIXME: this is the most horrible function ever. I can only
* claim responsibility for 50% of the hideous horror that
* is this function. Before you smite me to eternal damnation
* for the monstrosity that follows, please keep in mind that
* the remaining half of the horror belongs squarely on those
* who defined the semantics and side effects of this disgusting
* monster.
*
*/
ALsizei alBufferAppendData_LOKI( ALuint buffer,
ALenum format,
void* data,
ALsizei osamps,
ALsizei freq ) {
AL_buffer *buf;
ALuint osize; /* old size */
ALuint csize; /* converted size */
ALuint nsamps; /* number of samples that csize represents */
ALuint csamps; /* number of samples to convert */
ALuint psize; /* predicted size of passed data after conversion */
ALuint orig_csamps; /* original number of samples to convert, pre truncation */
unsigned int remainingspace = 0;
unsigned int copyoffset = 0;
unsigned int copysize = 0;
ALenum tformat = 0; /* buffer's target format */
ALuint tfreq = 0; /* buffer's target frequency */
void *temp = NULL;
ALuint i;
_alLockBuffer();
buf = _alGetBuffer(buffer);
if(buf == NULL) {
/* invalid buffers go */
_alUnlockBuffer();
_alDebug(ALD_BUFFER, __FILE__, __LINE__,
"buffer id %d is invalid",
buffer);
_alDCSetError(AL_INVALID_NAME);
return 0;
}
/*
* Non streaming buffers go bye bye
*/
if(!(buf->flags & ALB_STREAMING)) {
_alUnlockBuffer();
_alDebug(ALD_STREAMING, __FILE__, __LINE__,
"buffer id %d not created with alGenStreamingBuffer",
buffer);
_alDCSetError(AL_INVALID_OPERATION);
return 0;
}
/* initialize stuff */
osize = buf->size;
/*
* Set csamps to the size of osamps in bytes.
*
* make sure that csamps contains an even multiple of
* the number of channels
*/
csamps = osamps;
csamps -= (csamps % _alGetChannelsFromFormat(format));
csamps *= (_alGetBitsFromFormat(format) / 8);
orig_csamps = csamps;
/* Set psize to the value that csamps would be in converted format */
psize = _al_PCMRatioify(freq, buf->frequency, format, buf->format, csamps);
/* set nsamps */
nsamps = osamps;
if(buf->streampos > buf->size) {
/* underflow! */
_alDebug(ALD_STREAMING,
__FILE__, __LINE__, "underflow! sp|size %d|%d",
buf->streampos, buf->size);
buf->streampos = buf->appendpos = 0;
remainingspace = buf->size;
} else if(buf->appendpos > buf->streampos) {
remainingspace = buf->size - buf->appendpos;
} else if(buf->size != 0) {
remainingspace = buf->streampos - buf->appendpos;
} else {
remainingspace = 0;
}
if((remainingspace >= MINSTREAMCHUNKSIZE) ||
(psize <= remainingspace)) {
/* only take enough space to fill buffer. */
_alDebug(ALD_STREAMING, __FILE__, __LINE__,
"fill data to end: rs|sp|ap. %d|%d|%d",
remainingspace, buf->streampos, buf->appendpos);
if(remainingspace < psize) {
copysize = remainingspace;
} else {
copysize = psize;
}
/* scale samples */
nsamps *= copysize;
nsamps /= psize;
/* remember to set copyoffset for offset_memcpy below */
copyoffset = buf->appendpos;
buf->appendpos += copysize;
} else if((osize > EXPANDSTREAMBUFSIZE) &&
(buf->streampos > MINSTREAMCHUNKSIZE) &&
(buf->appendpos > buf->streampos)) {
/*
* Okay:
*
* Since streampos is after append pos, and
* streampos is less than the min stream chunk
* size, we can safely wrap around and put the
* data at the beginning (the WRAP flag gets
* removed elsewhere.
*
* The only thing is, if the buffer is still
* fairly small, it would be nice to expand it
* so that it can accomodate more data (within
* reason). So we check to see if the size
* greater than a certain threshold (expandbuffersize),
* below which we defer to allow BufferAppendData to
* expand the buffer.
*/
_alDebug(ALD_STREAMING, __FILE__, __LINE__,
"reset offset 0 osize|psize|sp|ap|rs %d|%d|%d|%d|%d",
osize, psize, buf->streampos, buf->appendpos,
remainingspace);
if(buf->streampos < psize) {
copysize = buf->streampos;
} else {
copysize = psize;
}
/* scale samples */
nsamps *= copysize;
nsamps /= psize;
copyoffset = 0;
buf->appendpos = copysize;
/* we can wrap. */
buf->flags |= ALB_STREAMING_WRAP;
} else if(buf->streampos < buf->appendpos) {
unsigned int newsize;
_alDebug(ALD_STREAMING, __FILE__, __LINE__,
"eb time: size|rs|ap|sp %d|%d|%d|%d",
osize, remainingspace, buf->appendpos, buf->streampos);
/* we must expand the size of our buffer */
newsize = buf->appendpos + psize;
assert(newsize >= osize);
for(i = 0; i < buf->num_buffers; i++) {
temp = realloc(buf->orig_buffers[i], newsize);
if(temp == NULL) {
_alUnlockBuffer();
return 0;
}
buf->orig_buffers[i] = temp;
}
/* set copy params for offset_memcpy below */
copyoffset = buf->appendpos;
copysize = psize;
/* reset size */
buf->size = newsize;
/*
* set append
*/
buf->appendpos += psize;
} else if(buf->size > 0) {
/* not ready to accept data */
_alDebug(ALD_STREAMING, __FILE__, __LINE__,
"osize|sp|ap|rs %d|%d|%d|%d",
osize,
buf->streampos,
buf->appendpos,
remainingspace);
_alUnlockBuffer();
return 0;
}
/*
* unlock buffer for time intensive stuff, but
* get buffer params first
*/
tformat = buf->format;
tfreq = buf->frequency;
_alUnlockBuffer();
/*
* Recompute csamps to reflect a decrease of the amount of
* data that we will use.
*/
csamps = nsamps;
csamps -= (csamps % _alGetChannelsFromFormat(format));
csamps *= (_alGetBitsFromFormat(format) / 8);
/*
* We should decide how much data to use such that csize is
* a reasonable number.
*
* bufferAppendScratch = converted data scratch space
* csize = converted data's size
*
* nsamps = number of samples that csize represents
*/
if(scratch.size < csamps * (_alGetBitsFromFormat(format)/8)) {
temp = realloc(scratch.data, csamps * (_alGetBitsFromFormat(format)/8));
if(temp == NULL) {
/* oops */
return 0;
}
scratch.data = temp;
scratch.size = csamps * (_alGetBitsFromFormat(format)/8);
}
memcpy(scratch.data, data, csamps * (_alGetBitsFromFormat(format)>>3));
temp = _alBufferCanonizeData(format,
scratch.data,
csamps,
freq,
tformat,
tfreq,
&csize,
AL_TRUE);
if(temp == NULL) {
/* conversion problem */
_alDCSetError(AL_OUT_OF_MEMORY);
_alDebug(ALD_CONVERT, __FILE__, __LINE__,
"streaming buffer id %d: could not convert",
buffer);
return 0;
}
/* lock buffer again, as we are about to make changes */
_alLockBuffer();
if(buf->size == 0) {
/* first time: copy data */
_alDebug(ALD_STREAMING, __FILE__, __LINE__,
"first time!");
/* first time */
buf->size = csize / _alGetChannelsFromFormat(buf->format);
for(i = 0; i < buf->num_buffers; i++) {
temp = realloc(buf->orig_buffers[i], csize / _alGetChannelsFromFormat(buf->format));
if(temp == NULL) {
_alUnlockBuffer();
return 0;
}
buf->orig_buffers[i] = temp;
}
_alMonoify((ALshort **) buf->orig_buffers,
scratch.data,
csize / _alGetChannelsFromFormat(buf->format),
buf->num_buffers, _alGetChannelsFromFormat(buf->format));
buf->appendpos = csize;
_alUnlockBuffer();
return osamps;
}
_alMonoifyOffset((ALshort **) buf->orig_buffers,
copyoffset,
scratch.data,
csize / _alGetChannelsFromFormat(buf->format),
buf->num_buffers, _alGetChannelsFromFormat(buf->format));
/*
offset_memcpy(buf->_orig_buffer, copyoffset, bufferAppendScratch, copysize);
*/
_alUnlockBuffer();
return nsamps;
}
ALsizei alCaptureGetData_EXT( UNUSED(ALvoid* data),
UNUSED(ALsizei n),
UNUSED(ALenum format),
UNUSED(ALuint rate) )
{
AL_device *dev;
ALuint size;
ALuint cid;
AL_context *cc;
/* get the read device */
cid = _alcCCId;
cc = _alcGetContext(cid);
if ( cc == NULL ) {
return 0;
}
dev = cc->read_device;
if ( (dev->format == format) && (dev->speed == rate) ) {
size = _alcDeviceRead(cid, data, n);
} else {
ALuint samples;
void *temp;
samples = n / (_al_formatbits(format) / 8);
/* Set size to the bytes of raw audio data we need */
size = _al_PCMRatioify(rate, dev->speed,
format, dev->format, samples);
size *= (_al_formatbits(dev->format) / 8);
if ( n > (ALsizei)size )
temp = malloc( n );
else
temp = malloc( size );
if ( size > 0 ) {
size = _alcDeviceRead(cid, temp, size);
temp = _alBufferCanonizeData(dev->format,
temp,
size,
dev->speed,
format,
rate,
&size,
AL_TRUE);
} else {
/* Hmm, zero size in record.. */
memset(temp, 0, n);
size = n;
}
if(temp == NULL) {
fprintf(stderr, "could not canonize data\n");
return 0;
}
memcpy(data, temp, size);
free( temp );
}
return size;
}