Moving AppendableAudioStream into SCUMM engine, as it is only used there

svn-id: r16494

5 files changed, 163 insertions, 4 deletions

diff --git a/scumm/imuse_digi/dimuse.h b/scumm/imuse_digi/dimuse.h
index 0b2a057f6d..eb1e0df68f 100644
--- a/scumm/imuse_digi/dimuse.h
+++ b/scumm/imuse_digi/dimuse.h
@@ -28,6 +28,7 @@
 #include "scumm/imuse_digi/dimuse_sndmgr.h"
 #include "scumm/music.h"
 #include "scumm/saveload.h"
+#include "scumm/sound.h"
 
 #include "sound/mixer.h"
 #include "sound/audiostream.h"
diff --git a/scumm/smush/smush_mixer.h b/scumm/smush/smush_mixer.h
index 29d40766cc..051303997e 100644
--- a/scumm/smush/smush_mixer.h
+++ b/scumm/smush/smush_mixer.h
@@ -23,8 +23,7 @@
 #define SMUSH_MIXER_H
 
 #include "stdafx.h"
-#include "sound/audiostream.h"
-#include "sound/mixer.h"
+#include "scumm/sound.h"
 
 namespace Scumm {
 
diff --git a/scumm/smush/smush_player.h b/scumm/smush/smush_player.h
index 08629450b5..4238e0f053 100644
--- a/scumm/smush/smush_player.h
+++ b/scumm/smush/smush_player.h
@@ -26,8 +26,7 @@
 #include "scumm/smush/chunk.h"
 #include "scumm/smush/codec37.h"
 #include "scumm/smush/codec47.h"
-#include "sound/audiostream.h"
-#include "sound/mixer.h"
+#include "scumm/sound.h"
 
 namespace Scumm {
 
diff --git a/scumm/sound.cpp b/scumm/sound.cpp
index 2d277a1bcf..6892579cf4 100644
--- a/scumm/sound.cpp
+++ b/scumm/sound.cpp
@@ -2237,4 +2237,150 @@ int ScummEngine::readSoundResourceSmallHeader(int type, int idx) {
 }
 
 
+#pragma mark -
+#pragma mark --- Appendable audio stream ---
+#pragma mark -
+
+
+/**
+ * Wrapped memory stream.
+ */
+template<bool stereo, bool is16Bit, bool isUnsigned, bool isLE>
+class AppendableMemoryStream : public AppendableAudioStream {
+protected:
+	OSystem::MutexRef _mutex;
+
+	byte *_bufferStart;
+	byte *_bufferEnd;
+	byte *_pos;
+	byte *_end;
+	bool _finalized;
+	const int _rate;
+
+	inline bool eosIntern() const { return _end == _pos; };
+public:
+	AppendableMemoryStream(int rate, uint bufferSize);
+	~AppendableMemoryStream();
+	int readBuffer(int16 *buffer, const int numSamples);
+
+	bool isStereo() const		{ return stereo; }
+	bool endOfStream() const	{ return _finalized && eosIntern(); }
+	bool endOfData() const		{ return eosIntern(); }
+
+	int getRate() const			{ return _rate; }
+
+	void append(const byte *data, uint32 len);
+	void finish()				{ _finalized = true; }
+};
+
+template<bool stereo, bool is16Bit, bool isUnsigned, bool isLE>
+AppendableMemoryStream<stereo, is16Bit, isUnsigned, isLE>::AppendableMemoryStream(int rate, uint bufferSize)
+ : _finalized(false), _rate(rate) {
+
+	// Verify the buffer size is sane
+	if (is16Bit && stereo)
+		assert((bufferSize & 3) == 0);
+	else if (is16Bit || stereo)
+		assert((bufferSize & 1) == 0);
+
+	_bufferStart = (byte *)malloc(bufferSize);
+	_pos = _end = _bufferStart;
+	_bufferEnd = _bufferStart + bufferSize;
+
+	_mutex = g_system->createMutex();
+}
+
+template<bool stereo, bool is16Bit, bool isUnsigned, bool isLE>
+AppendableMemoryStream<stereo, is16Bit, isUnsigned, isLE>::~AppendableMemoryStream() {
+	free(_bufferStart);
+	g_system->deleteMutex(_mutex);
+}
+
+template<bool stereo, bool is16Bit, bool isUnsigned, bool isLE>
+int AppendableMemoryStream<stereo, is16Bit, isUnsigned, isLE>::readBuffer(int16 *buffer, const int numSamples) {
+	Common::StackLock lock(_mutex);
+
+	int samples = 0;
+	while (samples < numSamples && !eosIntern()) {
+		// Wrap around?
+		if (_pos >= _bufferEnd)
+			_pos = _pos - (_bufferEnd - _bufferStart);
+
+		const byte *endMarker = (_pos > _end) ? _bufferEnd : _end;
+		const int len = MIN(numSamples, samples + (int)(endMarker - _pos) / (is16Bit ? 2 : 1));
+		while (samples < len) {
+			*buffer++ = READ_ENDIAN_SAMPLE(is16Bit, isUnsigned, _pos, isLE);
+			_pos += (is16Bit ? 2 : 1);
+			samples++;
+		}
+	}
+
+	return samples;
+}
+
+template<bool stereo, bool is16Bit, bool isUnsigned, bool isLE>
+void AppendableMemoryStream<stereo, is16Bit, isUnsigned, isLE>::append(const byte *data, uint32 len) {
+	Common::StackLock lock(_mutex);
+
+	// Verify the buffer size is sane
+	if (is16Bit && stereo)
+		assert((len & 3) == 0);
+	else if (is16Bit || stereo)
+		assert((len & 1) == 0);
+	
+	// Verify that the stream has not yet been finalized (by a call to finish())
+	assert(!_finalized);
+
+	if (_end + len > _bufferEnd) {
+		// Wrap-around case
+		uint32 size_to_end_of_buffer = _bufferEnd - _end;
+		len -= size_to_end_of_buffer;
+		if ((_end < _pos) || (_bufferStart + len >= _pos)) {
+			debug(2, "AppendableMemoryStream: buffer overflow (A)");
+			return;
+		}
+		memcpy(_end, data, size_to_end_of_buffer);
+		memcpy(_bufferStart, data + size_to_end_of_buffer, len);
+		_end = _bufferStart + len;
+	} else {
+		if ((_end < _pos) && (_end + len >= _pos)) {
+			debug(2, "AppendableMemoryStream: buffer overflow (B)");
+			return;
+		}
+		memcpy(_end, data, len);
+		_end += len;
+	}
+}
+
+
+#define MAKE_WRAPPED(STEREO, UNSIGNED) \
+		if (is16Bit) { \
+			if (isLE) \
+				return new AppendableMemoryStream<STEREO, true, UNSIGNED, true>(rate, len); \
+			else  \
+				return new AppendableMemoryStream<STEREO, true, UNSIGNED, false>(rate, len); \
+		} else \
+			return new AppendableMemoryStream<STEREO, false, UNSIGNED, false>(rate, len)
+
+AppendableAudioStream *makeAppendableAudioStream(int rate, byte _flags, uint32 len) {
+	const bool isStereo = (_flags & SoundMixer::FLAG_STEREO) != 0;
+	const bool is16Bit = (_flags & SoundMixer::FLAG_16BITS) != 0;
+	const bool isUnsigned = (_flags & SoundMixer::FLAG_UNSIGNED) != 0;
+	const bool isLE       = (_flags & SoundMixer::FLAG_LITTLE_ENDIAN) != 0;
+	
+	if (isStereo) {
+		if (isUnsigned) {
+			MAKE_WRAPPED(true, true);
+		} else {
+			MAKE_WRAPPED(true, false);
+		}
+	} else {
+		if (isUnsigned) {
+			MAKE_WRAPPED(false, true);
+		} else {
+			MAKE_WRAPPED(false, false);
+		}
+	}
+}
+
 } // End of namespace Scumm
diff --git a/scumm/sound.h b/scumm/sound.h
index 6bbff1dfe2..16d1e7b738 100644
--- a/scumm/sound.h
+++ b/scumm/sound.h
@@ -22,6 +22,7 @@
 #define SOUND_H
 
 #include "common/scummsys.h"
+#include "sound/audiostream.h"
 #include "sound/mixer.h"
 
 class File;
@@ -129,6 +130,19 @@ protected:
 	bool isSoundInQueue(int sound) const;
 };
 
+/**
+ * An audio stream to which additional data can be appended on-the-fly.
+ * Used by SMUSH and iMuseDigital.
+ */
+class AppendableAudioStream : public AudioStream {
+public:
+	virtual void append(const byte *data, uint32 len) = 0;
+	virtual void finish() = 0;
+};
+
+AppendableAudioStream *makeAppendableAudioStream(int rate, byte _flags, uint32 len);
+
+
 } // End of namespace Scumm
 
 #endif