int VorbisProcessData(OggData *data, char *buffer)
{
int num_samples;
float **pcm;
float *chan;
int i, j;
int val;
ogg_packet packet;
int len;
len = 0;
num_samples = 0;
while (!len) {
if (ogg_stream_packetout(&data->astream, &packet) != 1) {
if (OggGetNextPage(&data->page, &data->sync, data->File)) {
// EOF
return -1;
}
ogg_stream_pagein(&data->astream, &data->page);
} else {
if (vorbis_synthesis(&data->vblock, &packet) == 0) {
vorbis_synthesis_blockin(&data->vdsp, &data->vblock);
}
while ((num_samples = vorbis_synthesis_pcmout(&data->vdsp, &pcm)) > 0) {
j = 0;
for (i = 0; i < data->vinfo.channels; ++i) {
chan = pcm[i];
for (j = 0; j < num_samples; ++j) {
val = static_cast<int>(chan[j] * 32767.f);
if (val > 32767) {
val = 32767;
} else if (val < -32768) {
val = -32768;
}
*(Sint16 *)(buffer + len
+ (j * 2 * data->vinfo.channels) + i * 2) = (Sint16)val;
}
}
len += j * 2 * data->vinfo.channels;
// we consumed num_samples
vorbis_synthesis_read(&data->vdsp, num_samples);
}
}
}
return len;
}
/**
** Process Ogg data
*/
static int TheoraProcessData(OggData *data)
{
ogg_packet packet;
while (1) {
if (ogg_stream_packetout(&data->vstream, &packet) != 1) {
if (OggGetNextPage(&data->page, &data->sync, data->File)) {
// EOF
return -1;
}
ogg_stream_pagein(&data->vstream, &data->page);
} else {
theora_decode_packetin(&data->tstate, &packet);
return 0;
}
}
}
int OggInit(CFile *f, OggData *data)
{
ogg_packet packet;
int num_vorbis;
#ifdef USE_THEORA
int num_theora;
#endif
int stream_start;
int ret;
unsigned magic;
f->read(&magic, sizeof(magic));
if (SDL_SwapLE32(magic) != 0x5367674F) { // "OggS" in ASCII
return -1;
}
f->seek(0, SEEK_SET);
ogg_sync_init(&data->sync);
vorbis_info_init(&data->vinfo);
vorbis_comment_init(&data->vcomment);
#ifdef USE_THEORA
theora_info_init(&data->tinfo);
theora_comment_init(&data->tcomment);
#endif
#ifdef USE_THEORA
num_theora = 0;
#endif
num_vorbis = 0;
stream_start = 0;
while (!stream_start) {
ogg_stream_state test;
if (OggGetNextPage(&data->page, &data->sync, f)) {
return -1;
}
if (!ogg_page_bos(&data->page)) {
if (num_vorbis) {
ogg_stream_pagein(&data->astream, &data->page);
}
#ifdef USE_THEORA
if (num_theora) {
ogg_stream_pagein(&data->vstream, &data->page);
}
#endif
stream_start = 1;
break;
}
ogg_stream_init(&test, ogg_page_serialno(&data->page));
ogg_stream_pagein(&test, &data->page);
// initial codec headers
while (ogg_stream_packetout(&test, &packet) == 1) {
#ifdef USE_THEORA
if (theora_decode_header(&data->tinfo, &data->tcomment, &packet) >= 0) {
memcpy(&data->vstream, &test, sizeof(test));
++num_theora;
} else
#endif
if (!vorbis_synthesis_headerin(&data->vinfo, &data->vcomment, &packet)) {
memcpy(&data->astream, &test, sizeof(test));
++num_vorbis;
} else {
ogg_stream_clear(&test);
}
}
}
data->audio = num_vorbis;
#ifdef USE_THEORA
data->video = num_theora;
#endif
// remainint codec headers
while ((num_vorbis && num_vorbis < 3)
#ifdef USE_THEORA
|| (num_theora && num_theora < 3) ) {
// are we in the theora page ?
while (num_theora && num_theora < 3 &&
(ret = ogg_stream_packetout(&data->vstream, &packet))) {
if (ret < 0) {
return -1;
}
if (theora_decode_header(&data->tinfo, &data->tcomment, &packet)) {
return -1;
}
++num_theora;
}
#else
) {
#endif
// are we in the vorbis page ?
while (num_vorbis && num_vorbis < 3 &&
(ret = ogg_stream_packetout(&data->astream, &packet))) {
if (ret < 0) {
return -1;
}
if (vorbis_synthesis_headerin(&data->vinfo, &data->vcomment, &packet)) {
return -1;
}
++num_vorbis;
}
if (OggGetNextPage(&data->page, &data->sync, f)) {
break;
}
if (num_vorbis) {
ogg_stream_pagein(&data->astream, &data->page);
}
#ifdef USE_THEORA
if (num_theora) {
ogg_stream_pagein(&data->vstream, &data->page);
}
#endif
}
if (num_vorbis) {
vorbis_synthesis_init(&data->vdsp, &data->vinfo);
vorbis_block_init(&data->vdsp, &data->vblock);
} else {
vorbis_info_clear(&data->vinfo);
vorbis_comment_clear(&data->vcomment);
}
#ifdef USE_THEORA
if (num_theora) {
theora_decode_init(&data->tstate, &data->tinfo);
data->tstate.internal_encode = NULL; // needed for a bug in libtheora (fixed in next release)
} else {
theora_info_clear(&data->tinfo);
theora_comment_clear(&data->tcomment);
}
return !(num_vorbis || num_theora);
#else
return !num_vorbis;
#endif
}
