From f00cd05b331cb5db1dfee140608d6189385950a4 Mon Sep 17 00:00:00 2001
From: Max Horn
Date: Sat, 29 Nov 2003 12:11:01 +0000
Subject: 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
---
 sound/vorbis.cpp | 150 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 150 insertions(+)
 create mode 100644 sound/vorbis.cpp

(limited to 'sound/vorbis.cpp')

diff --git a/sound/vorbis.cpp b/sound/vorbis.cpp
new file mode 100644
index 0000000000..cd1a84ad08
--- /dev/null
+++ b/sound/vorbis.cpp
@@ -0,0 +1,150 @@
+/* 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/vorbis.h"
+#include "common/file.h"
+#include "common/util.h"
+
+#ifdef USE_VORBIS
+// These are wrapper functions to allow using a File object to
+// provide data to the OggVorbis_File object.
+
+struct file_info {
+	File *file;
+	int start, curr_pos;
+	size_t len;
+};
+
+static size_t read_wrap(void *ptr, size_t size, size_t nmemb, void *datasource) {
+	file_info *f = (file_info *) datasource;
+	int result;
+
+	nmemb *= size;
+	if (f->curr_pos > (int) f->len)
+		nmemb = 0;
+	else if (nmemb > f->len - f->curr_pos)
+		nmemb = f->len - f->curr_pos;
+	result = f->file->read(ptr, nmemb);
+	if (result == -1) {
+		f->curr_pos = f->file->pos() - f->start;
+		return (size_t) -1;
+	} else {
+		f->curr_pos += result;
+		return result / size;
+	}
+}
+
+static int seek_wrap(void *datasource, ogg_int64_t offset, int whence) {
+	file_info *f = (file_info *) datasource;
+
+	if (whence == SEEK_SET)
+		offset += f->start;
+	else if (whence == SEEK_END) {
+		offset += f->start + f->len;
+		whence = SEEK_SET;
+	}
+
+	f->file->seek(offset, whence);
+	f->curr_pos = f->file->pos() - f->start;
+	return f->curr_pos;
+}
+
+static int close_wrap(void *datasource) {
+	file_info *f = (file_info *) datasource;
+
+	f->file->close();
+	delete f;
+	return 0;
+}
+
+static long tell_wrap(void *datasource) {
+	file_info *f = (file_info *) datasource;
+
+	return f->curr_pos;
+}
+
+static ov_callbacks g_File_wrap = {
+	read_wrap, seek_wrap, close_wrap, tell_wrap
+};
+#endif
+
+#ifdef USE_VORBIS
+
+VorbisTrackInfo::VorbisTrackInfo(File *file) {
+	file_info *f = new file_info;
+
+	f->file = file;
+	f->start = 0;
+	f->len = file->size();
+	f->curr_pos = file->pos();
+
+	if (ov_open_callbacks((void *) f, &_ov_file, NULL, 0, g_File_wrap) < 0) {
+		warning("Invalid file format");
+		_error_flag = true;
+		delete f;
+		delete file;
+	} else {
+		_error_flag = false;
+		_file = file;
+	}
+}
+
+#ifdef CHUNKSIZE
+#define VORBIS_TREMOR
+#endif
+
+int VorbisTrackInfo::play(SoundMixer *mixer, PlayingSoundHandle *handle, int startFrame, int duration) {
+#ifdef VORBIS_TREMOR
+	ov_time_seek(&_ov_file, (ogg_int64_t)(startFrame / 75.0 * 1000));
+#else
+	ov_time_seek(&_ov_file, startFrame / 75.0);
+#endif
+	return mixer->playVorbis(handle, &_ov_file,
+							duration * ov_info(&_ov_file, -1)->rate / 75, true);
+}
+
+VorbisTrackInfo::~VorbisTrackInfo() {
+	if (! _error_flag) {
+		ov_clear(&_ov_file);
+		delete _file;
+	}
+}
+
+void playSfxSound_Vorbis(SoundMixer *mixer, File *file, uint32 size, PlayingSoundHandle *handle) {
+	OggVorbis_File *ov_file = new OggVorbis_File;
+	file_info *f = new file_info;
+
+	f->file = file;
+	f->start = file->pos();
+	f->len = size;
+	f->curr_pos = 0;
+
+	if (ov_open_callbacks((void *) f, ov_file, NULL, 0, g_File_wrap) < 0) {
+		warning("Invalid file format");
+		delete ov_file;
+		delete f;
+	} else
+		mixer->playVorbis(handle, ov_file, 0, false);
+}
+
+#endif
-- 
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