renamed the "mod" decoder plugin to "mikmod"

We have two mod plugins now: modplug and mod.  Rename the latter to a
more useful name.

src/decoder/mikmod_plugin.c

@@ -0,0 +1,257 @@
+/* the Music Player Daemon (MPD)
+ * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
+ * This project's homepage is: http://www.musicpd.org
+ * 
+ * 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
+ */
+
+#include "../decoder_api.h"
+
+#include <glib.h>
+#include <mikmod.h>
+
+/* this is largely copied from alsaplayer */
+
+#define MIKMOD_FRAME_SIZE	4096
+
+static BOOL mod_mpd_Init(void)
+{
+	return VC_Init();
+}
+
+static void mod_mpd_Exit(void)
+{
+	VC_Exit();
+}
+
+static void mod_mpd_Update(void)
+{
+}
+
+static BOOL mod_mpd_IsThere(void)
+{
+	return 1;
+}
+
+static char drv_name[] = "MPD";
+static char drv_version[] = "MPD Output Driver v0.1";
+
+#if (LIBMIKMOD_VERSION > 0x030106)
+static char drv_alias[] = "mpd";
+#endif
+
+static MDRIVER drv_mpd = {
+	NULL,
+	drv_name,
+	drv_version,
+	0,
+	255,
+#if (LIBMIKMOD_VERSION > 0x030106)
+	drv_alias,
+#if (LIBMIKMOD_VERSION >= 0x030200)
+	NULL,  /* CmdLineHelp */
+#endif
+	NULL,  /* CommandLine */
+#endif
+	mod_mpd_IsThere,
+	VC_SampleLoad,
+	VC_SampleUnload,
+	VC_SampleSpace,
+	VC_SampleLength,
+	mod_mpd_Init,
+	mod_mpd_Exit,
+	NULL,
+	VC_SetNumVoices,
+	VC_PlayStart,
+	VC_PlayStop,
+	mod_mpd_Update,
+	NULL,
+	VC_VoiceSetVolume,
+	VC_VoiceGetVolume,
+	VC_VoiceSetFrequency,
+	VC_VoiceGetFrequency,
+	VC_VoiceSetPanning,
+	VC_VoiceGetPanning,
+	VC_VoicePlay,
+	VC_VoiceStop,
+	VC_VoiceStopped,
+	VC_VoiceGetPosition,
+	VC_VoiceRealVolume
+};
+
+static bool mod_initMikMod(void)
+{
+	static char params[] = "";
+
+	md_device = 0;
+	md_reverb = 0;
+
+	MikMod_RegisterDriver(&drv_mpd);
+	MikMod_RegisterAllLoaders();
+
+	md_pansep = 64;
+	md_mixfreq = 44100;
+	md_mode = (DMODE_SOFT_MUSIC | DMODE_INTERP | DMODE_STEREO |
+		   DMODE_16BITS);
+
+	if (MikMod_Init(params)) {
+		g_warning("Could not init MikMod: %s\n",
+			  MikMod_strerror(MikMod_errno));
+		return false;
+	}
+
+	return true;
+}
+
+static void mod_finishMikMod(void)
+{
+	MikMod_Exit();
+}
+
+typedef struct _mod_Data {
+	MODULE *moduleHandle;
+	SBYTE audio_buffer[MIKMOD_FRAME_SIZE];
+} mod_Data;
+
+static mod_Data *mod_open(const char *path)
+{
+	char *path2;
+	MODULE *moduleHandle;
+	mod_Data *data;
+
+	path2 = g_strdup(path);
+	moduleHandle = Player_Load(path2, 128, 0);
+	g_free(path2);
+
+	if (moduleHandle == NULL)
+		return NULL;
+
+	/* Prevent module from looping forever */
+	moduleHandle->loop = 0;
+
+	data = g_new(mod_Data, 1);
+	data->moduleHandle = moduleHandle;
+
+	Player_Start(data->moduleHandle);
+
+	return data;
+}
+
+static void mod_close(mod_Data * data)
+{
+	Player_Stop();
+	Player_Free(data->moduleHandle);
+	free(data);
+}
+
+static void
+mod_decode(struct decoder *decoder, const char *path)
+{
+	mod_Data *data;
+	struct audio_format audio_format;
+	float total_time = 0.0;
+	int ret;
+	float secPerByte;
+	enum decoder_command cmd = DECODE_COMMAND_NONE;
+
+	if (!(data = mod_open(path))) {
+		g_warning("failed to open mod: %s\n", path);
+		MikMod_Exit();
+		return;
+	}
+
+	audio_format.bits = 16;
+	audio_format.sample_rate = 44100;
+	audio_format.channels = 2;
+
+	secPerByte =
+	    1.0 / ((audio_format.bits * audio_format.channels / 8.0) *
+		   (float)audio_format.sample_rate);
+
+	decoder_initialized(decoder, &audio_format, false, 0);
+
+	while (cmd == DECODE_COMMAND_NONE && Player_Active()) {
+		ret = VC_WriteBytes(data->audio_buffer, MIKMOD_FRAME_SIZE);
+		total_time += ret * secPerByte;
+		cmd = decoder_data(decoder, NULL,
+				   data->audio_buffer, ret,
+				   total_time, 0, NULL);
+	}
+
+	mod_close(data);
+
+	MikMod_Exit();
+}
+
+static struct tag *modTagDup(const char *file)
+{
+	char *path2;
+	struct tag *ret = NULL;
+	MODULE *moduleHandle;
+	char *title;
+
+	path2 = g_strdup(file);
+	moduleHandle = Player_Load(path2, 128, 0);
+	g_free(path2);
+
+	if (moduleHandle == NULL) {
+		g_debug("modTagDup: Failed to open file: %s\n", file);
+		MikMod_Exit();
+		return NULL;
+
+	}
+	Player_Free(moduleHandle);
+
+	ret = tag_new();
+
+	ret->time = 0;
+
+	path2 = g_strdup(file);
+	title = g_strdup(Player_LoadTitle(path2));
+	g_free(path2);
+	if (title)
+		tag_add_item(ret, TAG_ITEM_TITLE, title);
+
+	MikMod_Exit();
+
+	return ret;
+}
+
+static const char *const modSuffixes[] = {
+	"amf",
+	"dsm",
+	"far",
+	"gdm",
+	"imf",
+	"it",
+	"med",
+	"mod",
+	"mtm",
+	"s3m",
+	"stm",
+	"stx",
+	"ult",
+	"uni",
+	"xm",
+	NULL
+};
+
+const struct decoder_plugin mikmod_decoder_plugin = {
+	.name = "mikmod",
+	.init = mod_initMikMod,
+	.finish = mod_finishMikMod,
+	.file_decode = mod_decode,
+	.tag_dup = modTagDup,
+	.suffixes = modSuffixes,
+};