mpd/src/inputPlugins/mod_plugin.c

/* the Music Player Daemon (MPD)
 * (c)2003-2004 by Warren Dukes (shank@mercury.chem.pitt.edu)
 * 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 "../inputPlugin.h"

#ifdef HAVE_MIKMOD

#include "../utils.h"
#include "../audio.h"
#include "../log.h"
#include "../pcm_utils.h"
#include "../playerData.h"

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <mikmod.h>

/* this is largely copied from alsaplayer */

#define MIKMOD_FRAME_SIZE	4096

static BOOL mod_mpd_Init() {
	return VC_Init();
}

static void mod_mpd_Exit() {
	VC_Exit();
}

static void mod_mpd_Update() {
}

static BOOL mod_mpd_IsThere() {
	return 1;
}

MDRIVER drv_mpd =
{
	NULL,
	"MPD",
	"MPD Output Driver v0.1",
	0,
	255,
	"mpd",
	NULL,
	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 int mod_mikModInitiated = 0;
static int mod_mikModInitError = 0;

static int mod_initMikMod() {
	if(mod_mikModInitError) return -1;

	if(!mod_mikModInitiated) {
		mod_mikModInitiated = 1;

		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("")) {
		ERROR("Could not init MikMod: %s\n", 
			MikMod_strerror(MikMod_errno));
		mod_mikModInitError = 1;
		return -1;
	}

	return 0;
}

void mod_finishMikMod() {
	MikMod_Exit();
}

typedef struct _mod_Data {
	MODULE * moduleHandle;
	SBYTE * audio_buffer;
} mod_Data; 

static mod_Data * mod_open(char * path) {
	MODULE * moduleHandle;
	mod_Data * data;

	if(!(moduleHandle = Player_Load(path, 128, 0))) return NULL;

	data = malloc(sizeof(mod_Data));

	data->audio_buffer = malloc(MIKMOD_FRAME_SIZE);
	data->moduleHandle = moduleHandle;

	Player_Start(data->moduleHandle);

	return data;
}

static void mod_close(mod_Data * data) {
	Player_Stop();
	Player_Free(data->moduleHandle);
	free(data->audio_buffer);
	free(data);
}

int mod_decode(OutputBuffer * cb, DecoderControl * dc, char * path) {
	mod_Data * data;
	float time = 0.0;
	int ret;
	float secPerByte;

	if(mod_initMikMod() < 0) return -1;

	if(!(data = mod_open(path))) {
		ERROR("failed to open mod: %s\n", path);
		MikMod_Exit();
		return -1;
	}
	
	dc->audioFormat.bits = 16;
	dc->audioFormat.sampleRate = 44100;
	dc->audioFormat.channels = 2;
        getOutputAudioFormat(&(dc->audioFormat),&(cb->audioFormat));

	secPerByte = 1.0/((dc->audioFormat.bits*dc->audioFormat.channels/8.0)*
				(float)dc->audioFormat.sampleRate);
	
	dc->state = DECODE_STATE_DECODE;
	while(1) {
		if(dc->seek) {
			dc->seekError = 1;
			dc->seek = 0;
		}

		if(dc->stop) break;

		if(!Player_Active()) break;

		ret = VC_WriteBytes(data->audio_buffer, MIKMOD_FRAME_SIZE);
		time += ret*secPerByte;
		sendDataToOutputBuffer(cb, NULL, dc, 0, 
					(char *)data->audio_buffer, ret, time,
					0, NULL);
	}

	flushOutputBuffer(cb);

	mod_close(data);

	MikMod_Exit();

	if(dc->stop) {
		dc->state = DECODE_STATE_STOP;
		dc->stop = 0;
	}
	else dc->state = DECODE_STATE_STOP;

	return 0;
}

MpdTag * modTagDup(char * file) {
	MpdTag * ret = NULL;
	MODULE * moduleHandle;
	char * title;

	if(mod_initMikMod() < 0) {
		DEBUG("modTagDup: Failed to initialize MikMod\n");
		return NULL;
	}

	if(!(moduleHandle = Player_Load(file, 128, 0))) {
		DEBUG("modTagDup: Failed to open file: %s\n",file);
		MikMod_Exit();
		return NULL;

	}
	Player_Free(moduleHandle);

	ret = newMpdTag();

	ret->time = 0;
	title = strdup(Player_LoadTitle(file));
	if(title) addItemToMpdTag(ret, TAG_ITEM_TITLE, title);

	MikMod_Exit();

	return ret;
}

char * modSuffixes[] = {"amf",
			"dsm",
			"far",
			"gdm",
			"imf",
			"it",
			"med",
			"mod",
			"mtm",
			"s3m",
			"stm",
			"stx",
			"ult",
			"uni",
			"xm",
			NULL};

InputPlugin modPlugin = 
{
        "mod",
        NULL,
	mod_finishMikMod,
	NULL,
	NULL,
        mod_decode,
        modTagDup,
        INPUT_PLUGIN_STREAM_FILE,
        modSuffixes,
        NULL
};

#else

InputPlugin modPlugin =
{
        NULL,
        NULL,
        NULL,
	NULL,
        NULL,
	NULL,
	NULL,
        0,
        NULL,
        NULL
};

#endif /* HAVE_AUDIOFILE */