qboolean decoder_ogg_reset( snd_stream_t *stream )
{
snd_ogg_stream_t *ogg_stream;
if( stream->isUrl )
return qfalse;
ogg_stream = (snd_ogg_stream_t *)stream->ptr;
return qov_pcm_seek( &ogg_stream->vorbisfile, 0 ) == 0;
}
/*
====================
OGG_GetSamplesFloat
====================
*/
static void OGG_GetSamplesFloat (channel_t *ch, sfx_t *sfx, int firstsampleframe, int numsampleframes, float *outsamplesfloat)
{
ogg_stream_perchannel_t *per_ch = (ogg_stream_perchannel_t *)ch->fetcher_data;
ogg_stream_persfx_t *per_sfx = (ogg_stream_persfx_t *)sfx->fetcher_data;
int f = sfx->format.width * sfx->format.channels; // bytes per frame in the buffer
short *buf;
int i, len;
int newlength, done, ret;
// if this channel does not yet have a channel fetcher, make one
if (per_ch == NULL)
{
// allocate a struct to keep track of our file position and buffer
per_ch = (ogg_stream_perchannel_t *)Mem_Alloc(snd_mempool, sizeof(*per_ch));
// begin decoding the file
per_ch->ov_decode.buffer = per_sfx->file;
per_ch->ov_decode.ind = 0;
per_ch->ov_decode.buffsize = per_sfx->filesize;
if (qov_open_callbacks(&per_ch->ov_decode, &per_ch->vf, NULL, 0, callbacks) < 0)
{
// this never happens - this function succeeded earlier on the same data
Mem_Free(per_ch);
return;
}
per_ch->bs = 0;
per_ch->buffer_firstframe = 0;
per_ch->buffer_numframes = 0;
// attach the struct to our channel
ch->fetcher_data = (void *)per_ch;
}
// if the request is too large for our buffer, loop...
while (numsampleframes * f > (int)sizeof(per_ch->buffer))
{
done = sizeof(per_ch->buffer) / f;
OGG_GetSamplesFloat(ch, sfx, firstsampleframe, done, outsamplesfloat);
firstsampleframe += done;
numsampleframes -= done;
outsamplesfloat += done * sfx->format.channels;
}
// seek if the request is before the current buffer (loop back)
// seek if the request starts beyond the current buffer by at least one frame (channel was zero volume for a while)
// do not seek if the request overlaps the buffer end at all (expected behavior)
if (per_ch->buffer_firstframe > firstsampleframe || per_ch->buffer_firstframe + per_ch->buffer_numframes < firstsampleframe)
{
// we expect to decode forward from here so this will be our new buffer start
per_ch->buffer_firstframe = firstsampleframe;
per_ch->buffer_numframes = 0;
ret = qov_pcm_seek(&per_ch->vf, (ogg_int64_t)firstsampleframe);
if (ret != 0)
{
// LordHavoc: we can't Con_Printf here, not thread safe...
//Con_Printf("OGG_FetchSound: qov_pcm_seek(..., %d) returned %d\n", firstsampleframe, ret);
return;
}
}
// decompress the file as needed
if (firstsampleframe + numsampleframes > per_ch->buffer_firstframe + per_ch->buffer_numframes)
{
// first slide the buffer back, discarding any data preceding the range we care about
int offset = firstsampleframe - per_ch->buffer_firstframe;
int keeplength = per_ch->buffer_numframes - offset;
if (keeplength > 0)
memmove(per_ch->buffer, per_ch->buffer + offset * sfx->format.width * sfx->format.channels, keeplength * sfx->format.width * sfx->format.channels);
per_ch->buffer_firstframe = firstsampleframe;
per_ch->buffer_numframes -= offset;
// decompress as much as we can fit in the buffer
newlength = sizeof(per_ch->buffer) - per_ch->buffer_numframes * f;
done = 0;
while (newlength > done && (ret = qov_read(&per_ch->vf, (char *)per_ch->buffer + per_ch->buffer_numframes * f + done, (int)(newlength - done), mem_bigendian, 2, 1, &per_ch->bs)) > 0)
done += ret;
// clear the missing space if any
if (done < newlength)
memset(per_ch->buffer + done, 0, newlength - done);
// we now have more data in the buffer
per_ch->buffer_numframes += done / f;
}
// convert the sample format for the caller
buf = (short *)((char *)per_ch->buffer + (firstsampleframe - per_ch->buffer_firstframe) * f);
len = numsampleframes * sfx->format.channels;
for (i = 0;i < len;i++)
outsamplesfloat[i] = buf[i] * (1.0f / 32768.0f);
}