X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;ds=sidebyside;f=source%2Foggdecoder.cpp;fp=source%2Foggdecoder.cpp;h=a00b78ed7341bbfb42e1229d006490f15a6514b1;hb=10cdb043b613d60c5de8f1cce0f7a5512b0d0074;hp=0000000000000000000000000000000000000000;hpb=ef9906f379e066cb9c754853a3cc771e8e881356;p=libs%2Fal.git

diff --git a/source/oggdecoder.cpp b/source/oggdecoder.cpp
new file mode 100644
index 0000000..a00b78e
--- /dev/null
+++ b/source/oggdecoder.cpp
@@ -0,0 +1,99 @@
+#include <stdexcept>
+#include <vorbis/vorbisfile.h>
+#include "oggdecoder.h"
+
+using namespace std;
+
+namespace {
+
+size_t read(void *ptr, size_t size, size_t nmemb, void *src)
+{
+	Msp::IO::Base *in = reinterpret_cast<Msp::IO::Base *>(src);
+	unsigned len = in->read(reinterpret_cast<char *>(ptr), size*nmemb);
+	return len/size;
+}
+
+int seek(void *src, ogg_int64_t offset, int whence)
+{
+	Msp::IO::SeekType type;
+	if(whence==SEEK_SET)
+		type = Msp::IO::S_BEG;
+	else if(whence==SEEK_CUR)
+		type = Msp::IO::S_CUR;
+	else if(whence==SEEK_END)
+		type = Msp::IO::S_END;
+	else
+		return -1;
+
+	Msp::IO::Seekable *in = reinterpret_cast<Msp::IO::Seekable *>(src);
+	return in->seek(offset, type);
+}
+
+long tell(void *src)
+{
+	return reinterpret_cast<Msp::IO::Seekable *>(src)->tell();
+}
+
+ov_callbacks io_callbacks =
+{
+	&read,
+	&seek,
+	0,
+	&tell
+};
+
+} // namespace
+
+
+namespace Msp {
+namespace AL {
+
+struct OggDecoder::Private
+{
+	OggVorbis_File ovfile;	
+};
+
+OggDecoder::OggDecoder(IO::Seekable &io):
+	priv(new Private)
+{
+	if(ov_open_callbacks(&io, &priv->ovfile, 0, 0, io_callbacks)<0)
+		throw runtime_error("Could not open ogg vorbis resource");
+
+	vorbis_info *info = ov_info(&priv->ovfile, -1);
+	freq = info->rate;
+
+	size = ov_pcm_total(&priv->ovfile, 0)*info->channels*2;
+
+	switch(info->channels)
+	{
+	case 1: format = MONO16; break;
+	case 2: format = STEREO16; break;
+	default: throw runtime_error("Unsupported number of channels");
+	}
+}
+
+OggDecoder::~OggDecoder()
+{
+	if(priv->ovfile.datasource)
+		ov_clear(&priv->ovfile);
+	delete priv;
+}
+
+void OggDecoder::rewind()
+{
+	ov_pcm_seek(&priv->ovfile, 0);
+}
+
+unsigned OggDecoder::read(char *buf, unsigned len)
+{
+	int section = 0;
+	int res = ov_read(&priv->ovfile, buf, len, 0, 2, 1, &section);
+	if(res<0)
+		throw runtime_error("Error reading ogg vorbis file");
+	else if(res==0)
+		eof_flag = true;
+	return res;
+}
+
+} // namespace AL
+} // namespace Msp