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/*
* Plays Ogg Vorbis files using libvorbisfile (could perhaps slash
* the file size a bit by using only libvorbis+libogg, but it's a
* bit complicated and I don't think it's worth it). Ogg Vorbis
* rules, MP3 sucks. Whoa! ;-)
*/
#include <stdlib.h>
#include "audio/vorbis.h"
#include "exception.h"
/*
* These simply emulate a file to libvorbisfile, using the FileReader
* class.
*/
size_t mem_readfunc(void *ptr, size_t size, size_t nmemb, void *datasource)
{
return ((FileReader *) datasource)->fread(ptr, size, nmemb);
}
int mem_seekfunc(void *datasource, ogg_int64_t offset, int whence)
{
// <Vakor> make sure your seek callback returns -1 if you want to save cpu time,
// effort, and so on .
// (but for jump support, seek is nice)
return ((FileReader *) datasource)->fseek(offset, whence);
// return -1;
}
int mem_closefunc(void *datasource)
{
return 0;
}
long mem_tellfunc(void *datasource)
{
return ((FileReader *) datasource)->ftell();
}
OggVorbisAudioProvider::OggVorbisAudioProvider(File *file, float jump)
{
this->vf = (OggVorbis_File *)malloc(sizeof(OggVorbis_File));
if (this->vf == NULL) {
throw new FatalException("Out of memory!");
}
ov_callbacks mem_callbacks = {
mem_readfunc,
mem_seekfunc,
mem_closefunc,
mem_tellfunc
};
this->vfr = new FileReader(file);
if (ov_open_callbacks(this->vfr, this->vf, NULL, 0, mem_callbacks) < 0)
throw new FatalException("Couldn't open the Ogg bitstream");
if (jump != 0.0f) {
ov_time_seek(this->vf, jump);
}
/* validate it better later */
}
OggVorbisAudioProvider::~OggVorbisAudioProvider()
{
ov_clear(this->vf);
free(this->vf);
this->vf = NULL;
delete this->vfr;
this->vfr = NULL;
}
int OggVorbisAudioProvider::fill_buf(char *buf, int bytes)
{
int junk, ret;
ret = ov_read(this->vf, buf, bytes, 0, 2, 1, &junk);
if (ret < 0)
throw new FatalException("Ogg Vorbis stream error!");
return ret;
}
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