moved Audio CD (emulation) code from scumm/sound.cpp to sound/, so that it may be reused by other engines in the future

svn-id: r11421

1 files changed, 127 insertions, 0 deletions

diff --git a/sound/mp3.cpp b/sound/mp3.cpp
new file mode 100644
index 0000000000..db73f7f394
--- /dev/null
+++ b/sound/mp3.cpp
@@ -0,0 +1,127 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2003 The ScummVM project
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * $Header$
+ *
+ */
+
+#include "stdafx.h"
+
+#include "sound/mp3.h"
+#include "common/file.h"
+#include "common/util.h"
+
+#ifdef USE_MAD
+MP3TrackInfo::MP3TrackInfo(File *file) {
+	struct mad_stream stream;
+	struct mad_frame frame;
+	unsigned char buffer[8192];
+	unsigned int buflen = 0;
+	int count = 0;
+
+	// Check the format and bitrate
+	mad_stream_init(&stream);
+	mad_frame_init(&frame);
+
+	while (1) {
+		if (buflen < sizeof(buffer)) {
+			int bytes;
+
+			bytes = file->read(buffer + buflen, sizeof(buffer) - buflen);
+			if (bytes <= 0) {
+				if (bytes == -1) {
+					warning("Invalid file format");
+					goto error;
+				}
+				break;
+			}
+
+			buflen += bytes;
+		}
+
+		mad_stream_buffer(&stream, buffer, buflen);
+
+		while (1) {
+			if (mad_frame_decode(&frame, &stream) == -1) {
+				if (!MAD_RECOVERABLE(stream.error))
+					break;
+
+				if (stream.error != MAD_ERROR_BADCRC)
+					continue;
+			}
+
+			if (count++)
+				break;
+		}
+
+		if (count || stream.error != MAD_ERROR_BUFLEN)
+			break;
+
+		memmove(buffer, stream.next_frame,
+		        buflen = &buffer[buflen] - stream.next_frame);
+	}
+
+	if (count)
+		memcpy(&_mad_header, &frame.header, sizeof(mad_header));
+	else {
+		warning("Invalid file format");
+		goto error;
+	}
+
+	mad_frame_finish(&frame);
+	mad_stream_finish(&stream);
+	// Get file size
+	_size = file->size();
+	_file = file;
+	_error_flag = false;
+	return;
+
+error:
+	mad_frame_finish(&frame);
+	mad_stream_finish(&stream);
+	_error_flag = true;
+	delete file;
+}
+
+int MP3TrackInfo::play(SoundMixer *mixer, PlayingSoundHandle *handle, int startFrame, int duration) {
+	unsigned int offset;
+	mad_timer_t durationTime;
+
+	// Calc offset. As all bitrates are in kilobit per seconds, the division by 200 is always exact
+	offset = (startFrame * (_mad_header.bitrate / (8 * 25))) / 3;
+	_file->seek(offset, SEEK_SET);
+
+	// Calc delay
+	if (!duration) {
+		// FIXME: Using _size here is a problem if offset (or equivalently
+		// startFrame) is non-zero.
+		mad_timer_set(&durationTime, (_size * 8) / _mad_header.bitrate,
+					(_size * 8) % _mad_header.bitrate, _mad_header.bitrate);
+	} else {
+		mad_timer_set(&durationTime, duration / 75, duration % 75, 75);
+	}
+
+	// Play it
+	return mixer->playMP3CDTrack(handle, _file, durationTime);
+}
+
+MP3TrackInfo::~MP3TrackInfo() {
+	if (! _error_flag)
+		_file->close();
+}
+
+#endif