X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fsound.cpp;h=8b6af20fcde8fe2c0ea22951a8d138c3dece0289;hb=97dae493948466867b9f661f45e451711dd6b41b;hp=896d1d5c392798eb63595b0bb1b1f402a990a1fa;hpb=8e69eba7dc53233c169152bdf654f032fcd0629f;p=libs%2Fal.git

diff --git a/source/sound.cpp b/source/sound.cpp
index 896d1d5..8b6af20 100644
--- a/source/sound.cpp
+++ b/source/sound.cpp
@@ -5,39 +5,108 @@ Copyright © 2008 Mikko Rasa, Mikkosoft Productions
 Distributed under the LGPL
 */
 
+#include <cstring>
 #include <msp/core/except.h>
 #include "sound.h"
 
 using namespace std;
 
+namespace {
+
+struct MemorySource
+{
+	const void *data;
+	unsigned length;
+	unsigned pos;
+
+	MemorySource(const void *d, unsigned l): data(d), length(l), pos(0) { }
+};
+
+size_t memory_read(void *ptr, size_t size, size_t nmemb, void *src)
+{
+	MemorySource &memsrc=*reinterpret_cast<MemorySource *>(src);
+	unsigned len=min(size*nmemb, memsrc.length-memsrc.pos);
+	memcpy(ptr, reinterpret_cast<const char *>(memsrc.data)+memsrc.pos, len);
+	memsrc.pos+=len;
+
+	return len/size;
+}
+
+int memory_seek(void *src, ogg_int64_t offset, int whence)
+{
+	MemorySource &memsrc=*reinterpret_cast<MemorySource *>(src);
+	if(whence==SEEK_SET)
+		memsrc.pos=offset;
+	else if(whence==SEEK_CUR)
+		memsrc.pos+=offset;
+	else if(whence==SEEK_END)
+		memsrc.pos=memsrc.length-offset;
+	memsrc.pos=min(memsrc.pos, memsrc.length);
+
+	return memsrc.pos;
+}
+
+void memory_close(void *src)
+{
+	delete reinterpret_cast<MemorySource *>(src);
+}
+
+long memory_tell(void *src)
+{
+	MemorySource &memsrc=*reinterpret_cast<MemorySource *>(src);
+	return memsrc.pos;
+}
+
+ov_callbacks memory_callbacks=
+{
+	&memory_read,
+	&memory_seek,
+	0,
+	&memory_tell
+};
+
+} // namespace
+
 namespace Msp {
 namespace AL {
 
 Sound::Sound():
-	data(0)
+	data(0),
+	eof_flag(false)
 {
 	ovfile.datasource=0;
 }
 
 Sound::~Sound()
 {
+	delete[] data;
 	if(ovfile.datasource)
 		ov_clear(&ovfile);
 }
 
-void Sound::open(const string &fn)
+void Sound::open_file(const string &fn)
 {
+	if(ovfile.datasource)
+		throw InvalidState("Sound has already been opened");
 	if(ov_fopen(const_cast<char *>(fn.c_str()), &ovfile)<0)
 		throw Exception("Could not open ogg vorbis file "+fn);
 
-	vorbis_info *info=ov_info(&ovfile, -1);
-	freq=info->rate;
-	switch(info->channels)
+	open_common();
+}
+
+void Sound::open_memory(const void *d, unsigned len)
+{
+	if(ovfile.datasource)
+		throw InvalidState("Sound has already been opened");
+
+	MemorySource *src=new MemorySource(d, len);
+	if(ov_open_callbacks(src, &ovfile, 0, 0, memory_callbacks)<0)
 	{
-	case 1: format=MONO16; break;
-	case 2: format=STEREO16; break;
-	default: throw Exception("Unsupported number of channels");
+		delete src;
+		throw Exception("Could not open ogg vorbis memory block");
 	}
+
+	open_common();
 }
 
 void Sound::load_data()
@@ -46,17 +115,64 @@ void Sound::load_data()
 		throw InvalidState("Data has already been loaded");
 
 	size=ov_pcm_total(&ovfile, 0)*4;
-	data=new char[size];
+	char *dptr=new char[size];
 	unsigned pos=0;
-	while(unsigned len=read(data+pos, size-pos))
+	while(unsigned len=read(dptr+pos, size-pos))
 		pos+=len;
+	data=dptr;
 	size=pos;
+	read_pos=0;
+}
+
+void Sound::load_file(const std::string &fn)
+{
+	open_file(fn);
+	load_data();
+	close();
 }
 
-void Sound::load(const string &fn)
+void Sound::load_memory(const void *d, unsigned len)
 {
-	open(fn);
+	open_memory(d, len);
 	load_data();
+	close();
+}
+
+void Sound::close()
+{
+	if(ovfile.datasource)
+		ov_clear(&ovfile);
+}
+
+void Sound::rewind()
+{
+	if(data)
+		read_pos=0;
+	else
+		ov_pcm_seek(&ovfile, 0);
+}
+
+unsigned Sound::read(char *buf, unsigned len)
+{
+	if(data)
+	{
+		len=min(len, size-read_pos);
+		memcpy(buf, data+read_pos, len);
+		read_pos+=len;
+		return len;
+	}
+	else if(ovfile.datasource)
+	{
+		int section=0;
+		int res=ov_read(&ovfile, buf, len, 0, 2, 1, &section);
+		if(res<0)
+			throw Exception("Error reading ogg vorbis file");
+		else if(res==0)
+			eof_flag=true;
+		return res;
+	}
+	else
+		throw InvalidState("No data available");
 }
 
 const char *Sound::get_data() const
@@ -66,13 +182,19 @@ const char *Sound::get_data() const
 	return data;
 }
 
-unsigned Sound::read(char *buf, unsigned len)
+void Sound::open_common()
 {
-	int section=0;
-	int res=ov_read(&ovfile, buf, len, 0, 2, 1, &section);
-	if(res<0)
-		throw Exception("Error reading ogg vorbis file");
-	return res;
+	delete data;
+	data=0;
+
+	vorbis_info *info=ov_info(&ovfile, -1);
+	freq=info->rate;
+	switch(info->channels)
+	{
+	case 1: format=MONO16; break;
+	case 2: format=STEREO16; break;
+	default: throw Exception("Unsupported number of channels");
+	}
 }
 
 } // namespace AL