X-Git-Url: http://git.tdb.fi/?p=libs%2Fal.git;a=blobdiff_plain;f=source%2Fvorbis%2Foggdecoder.cpp;fp=source%2Fvorbis%2Foggdecoder.cpp;h=374cf0b5ba06966174270a96c1d193a511843bcb;hp=0000000000000000000000000000000000000000;hb=8e12e7c9f65632342a8f370ea2de6b029cb564ec;hpb=1e7141871d33e3e184456ba063fcf3448a8cc12a

diff --git a/source/vorbis/oggdecoder.cpp b/source/vorbis/oggdecoder.cpp
new file mode 100644
index 0000000..374cf0b
--- /dev/null
+++ b/source/vorbis/oggdecoder.cpp
@@ -0,0 +1,130 @@
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-variable"
+#include <vorbis/vorbisfile.h>
+#pragma GCC diagnostic pop
+#include <msp/strings/format.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 {
+
+ogg_error::ogg_error(const std::string &func, int code):
+	runtime_error(format("%s: %s", func, get_message(code)))
+{ }
+
+string ogg_error::get_message(int code)
+{
+	switch(code)
+	{
+	case OV_FALSE: return "No data available";
+	case OV_HOLE: return "Missing or corrupt data";
+	case OV_EREAD: return "Read error";
+	case OV_EFAULT: return "Internal inconsistency";
+	case OV_EIMPL: return "Not implemented";
+	case OV_EINVAL: return "Invalid argument";
+	case OV_ENOTVORBIS: return "Not Vorbis data";
+	case OV_EBADHEADER: return "Corrupt Vorbis header";
+	case OV_EVERSION: return "Unsupported version";
+	case OV_EBADLINK: return "Bad link";
+	case OV_ENOSEEK: return "Stream is not seekable";
+	default: return format("Unknown error (%d)", code);
+	}
+}
+
+
+struct OggDecoder::Private
+{
+	OggVorbis_File ovfile;	
+};
+
+OggDecoder::OggDecoder(IO::Seekable &io):
+	priv(new Private)
+{
+	int ret = ov_open_callbacks(&io, &priv->ovfile, 0, 0, io_callbacks);
+	if(ret<0)
+		throw ogg_error("ov_open_callbacks", ret);
+
+	vorbis_info *info = ov_info(&priv->ovfile, -1);
+	freq = info->rate;
+	format = create_format(2, info->channels);
+
+	size = ov_pcm_total(&priv->ovfile, 0)*get_unit_size(format);
+}
+
+OggDecoder::~OggDecoder()
+{
+	if(priv->ovfile.datasource)
+		ov_clear(&priv->ovfile);
+	delete priv;
+}
+
+bool OggDecoder::detect(const std::string &sig)
+{
+	static const char ogg_sig[] = { 'O', 'g', 'g', 'S' };
+	if(sig.size()<sizeof(ogg_sig))
+		return false;
+	return !sig.compare(0, sizeof(ogg_sig), ogg_sig, sizeof(ogg_sig));
+}
+
+void OggDecoder::seek(unsigned pos)
+{
+	pos /= get_unit_size(format);
+	ov_pcm_seek(&priv->ovfile, pos);
+}
+
+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 ogg_error("ov_read", res);
+	else if(res==0)
+		eof_flag = true;
+	return res;
+}
+
+} // namespace AL
+} // namespace Msp