From 42ab839dd6c8a1570b232101eb97f4e54de57935 Mon Sep 17 00:00:00 2001
From: Max Horn
Date: Wed, 9 Feb 2011 01:09:01 +0000
Subject: AUDIO: Rename sound/ dir to audio/

svn-id: r55850
---
 audio/decoders/aiff.cpp | 186 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 186 insertions(+)
 create mode 100644 audio/decoders/aiff.cpp

(limited to 'audio/decoders/aiff.cpp')

diff --git a/audio/decoders/aiff.cpp b/audio/decoders/aiff.cpp
new file mode 100644
index 0000000000..0f947752f6
--- /dev/null
+++ b/audio/decoders/aiff.cpp
@@ -0,0 +1,186 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+/*
+ * The code in this file is based on information found at
+ * http://www.borg.com/~jglatt/tech/aiff.htm
+ *
+ * We currently only implement uncompressed AIFF. If we ever need AIFF-C, SoX
+ * (http://sox.sourceforge.net) may be a good place to start from.
+ */
+
+#include "common/endian.h"
+#include "common/util.h"
+#include "common/stream.h"
+
+#include "audio/decoders/aiff.h"
+#include "audio/audiostream.h"
+#include "audio/mixer.h"
+#include "audio/decoders/raw.h"
+
+namespace Audio {
+
+uint32 readExtended(Common::SeekableReadStream &stream) {
+	// The sample rate is stored as an "80 bit IEEE Standard 754 floating
+	// point number (Standard Apple Numeric Environment [SANE] data type
+	// Extended).
+
+	byte buf[10];
+	uint32 mantissa;
+	uint32 last = 0;
+	byte exp;
+
+	stream.read(buf, 10);
+	mantissa = READ_BE_UINT32(buf + 2);
+	exp = 30 - buf[1];
+
+	while (exp--) {
+		last = mantissa;
+		mantissa >>= 1;
+	}
+
+	if (last & 0x00000001)
+		mantissa++;
+
+	return mantissa;
+}
+
+bool loadAIFFFromStream(Common::SeekableReadStream &stream, int &size, int &rate, byte &flags) {
+	byte buf[4];
+
+	stream.read(buf, 4);
+	if (memcmp(buf, "FORM", 4) != 0) {
+		warning("loadAIFFFromStream: No 'FORM' header");
+		return false;
+	}
+
+	stream.readUint32BE();
+
+	// This could be AIFC, but we don't handle that case.
+
+	stream.read(buf, 4);
+	if (memcmp(buf, "AIFF", 4) != 0) {
+		warning("loadAIFFFromStream: No 'AIFF' header");
+		return false;
+	}
+
+	// From here on, we only care about the COMM and SSND chunks, which are
+	// the only required chunks.
+
+	bool foundCOMM = false;
+	bool foundSSND = false;
+
+	uint16 numChannels = 0, bitsPerSample = 0;
+	uint32 numSampleFrames = 0, offset = 0, blockSize = 0, soundOffset = 0;
+
+	while (!(foundCOMM && foundSSND) && !stream.err() && !stream.eos()) {
+		uint32 length, pos;
+
+		stream.read(buf, 4);
+		length = stream.readUint32BE();
+		pos = stream.pos();
+
+		if (memcmp(buf, "COMM", 4) == 0) {
+			foundCOMM = true;
+			numChannels = stream.readUint16BE();
+			numSampleFrames = stream.readUint32BE();
+			bitsPerSample = stream.readUint16BE();
+			rate = readExtended(stream);
+			size = numSampleFrames * numChannels * (bitsPerSample / 8);
+		} else if (memcmp(buf, "SSND", 4) == 0) {
+			foundSSND = true;
+			offset = stream.readUint32BE();
+			blockSize = stream.readUint32BE();
+			soundOffset = stream.pos();
+		}
+
+		stream.seek(pos + length);
+	}
+
+	if (!foundCOMM) {
+		warning("loadAIFFFromStream: Cound not find 'COMM' chunk");
+		return false;
+	}
+
+	if (!foundSSND) {
+		warning("loadAIFFFromStream: Cound not find 'SSND' chunk");
+		return false;
+	}
+
+	// We only implement a subset of the AIFF standard.
+
+	if (numChannels < 1 || numChannels > 2) {
+		warning("loadAIFFFromStream: Only 1 or 2 channels are supported, not %d", numChannels);
+		return false;
+	}
+
+	if (bitsPerSample != 8 && bitsPerSample != 16) {
+		warning("loadAIFFFromStream: Only 8 or 16 bits per sample are supported, not %d", bitsPerSample);
+		return false;
+	}
+
+	if (offset != 0 || blockSize != 0) {
+		warning("loadAIFFFromStream: Block-aligned data is not supported");
+		return false;
+	}
+
+	// Samples are always signed, and big endian.
+
+	flags = 0;
+	if (bitsPerSample == 16)
+		flags |= Audio::FLAG_16BITS;
+	if (numChannels == 2)
+		flags |= Audio::FLAG_STEREO;
+
+	stream.seek(soundOffset);
+
+	// Stream now points at the sample data
+
+	return true;
+}
+
+SeekableAudioStream *makeAIFFStream(Common::SeekableReadStream *stream,
+	DisposeAfterUse::Flag disposeAfterUse) {
+	int size, rate;
+	byte *data, flags;
+
+	if (!loadAIFFFromStream(*stream, size, rate, flags)) {
+		if (disposeAfterUse == DisposeAfterUse::YES)
+			delete stream;
+		return 0;
+	}
+
+	data = (byte *)malloc(size);
+	assert(data);
+	stream->read(data, size);
+
+	if (disposeAfterUse == DisposeAfterUse::YES)
+		delete stream;
+
+	// Since we allocated our own buffer for the data, we must specify DisposeAfterUse::YES.
+	return makeRawStream(data, size, rate, flags);
+}
+
+} // End of namespace Audio
-- 
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