playmus.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 01 May 2006 03:12:21 +0000
changeset 297 c901cf1335d4
parent 257 8a32c0a3c609
child 321 a72a7f07c8f1
permissions -rw-r--r--
Added info on audio format endianness
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/*
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    PLAYMUS:  A test application for the SDL mixer library.
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    Copyright (C) 1997-2004 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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/* $Id$ */
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <signal.h>
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#ifdef unix
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#include <unistd.h>
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#endif
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#include "SDL.h"
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#include "SDL_mixer.h"
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static int audio_open = 0;
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static Mix_Music *music = NULL;
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static int next_track = 0;
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void CleanUp(void)
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{
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	if( Mix_PlayingMusic() ) {
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		Mix_FadeOutMusic(1500);
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		SDL_Delay(1500);
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	}
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	if ( music ) {
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		Mix_FreeMusic(music);
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		music = NULL;
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	}
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	if ( audio_open ) {
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		Mix_CloseAudio();
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		audio_open = 0;
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	}
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	SDL_Quit();
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}
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void Usage(char *argv0)
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{
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	fprintf(stderr, "Usage: %s [-i] [-l] [-8] [-r rate] [-c channels] [-b buffers] [-v N] [-rwops] <musicfile>\n", argv0);
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}
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void Menu(void)
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{
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	char buf[10];
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	printf("Available commands: (p)ause (r)esume (h)alt > ");
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	fflush(stdin);
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	scanf("%s",buf);
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	switch(buf[0]){
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	case 'p': case 'P':
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		Mix_PauseMusic();
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		break;
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	case 'r': case 'R':
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		Mix_ResumeMusic();
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		break;
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	case 'h': case 'H':
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		Mix_HaltMusic();
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		break;
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	}
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	printf("Music playing: %s Paused: %s\n", Mix_PlayingMusic() ? "yes" : "no", 
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		   Mix_PausedMusic() ? "yes" : "no");
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}
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void IntHandler(int sig)
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{
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	switch (sig) {
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	        case SIGINT:
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			next_track++;
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			break;
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	}
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}
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int main(int argc, char *argv[])
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{
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	SDL_RWops *rwfp;
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	int audio_rate;
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	Uint16 audio_format;
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	int audio_channels;
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	int audio_buffers;
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	int audio_volume = MIX_MAX_VOLUME;
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	int looping = 0;
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	int interactive = 0;
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	int rwops = 0;
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	int i;
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	/* Initialize variables */
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	audio_rate = 22050;
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	audio_format = AUDIO_S16;
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	audio_channels = 2;
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	audio_buffers = 4096;
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	/* Check command line usage */
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	for ( i=1; argv[i] && (*argv[i] == '-'); ++i ) {
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		if ( (strcmp(argv[i], "-r") == 0) && argv[i+1] ) {
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			++i;
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			audio_rate = atoi(argv[i]);
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		} else
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		if ( strcmp(argv[i], "-m") == 0 ) {
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			audio_channels = 1;
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		} else
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		if ( (strcmp(argv[i], "-c") == 0) && argv[i+1] ) {
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			++i;
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			audio_channels = atoi(argv[i]);
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		} else
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		if ( (strcmp(argv[i], "-b") == 0) && argv[i+1] ) {
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			++i;
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			audio_buffers = atoi(argv[i]);
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		} else
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		if ( (strcmp(argv[i], "-v") == 0) && argv[i+1] ) {
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			++i;
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			audio_volume = atoi(argv[i]);
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		} else
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		if ( strcmp(argv[i], "-l") == 0 ) {
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			looping = -1;
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		} else
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		if ( strcmp(argv[i], "-i") == 0 ) {
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			interactive = 1;
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		} else
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		if ( strcmp(argv[i], "-8") == 0 ) {
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			audio_format = AUDIO_U8;
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		} else
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		if ( strcmp(argv[i], "-rwops") == 0 ) {
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			rwops = 1;
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		} else {
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			Usage(argv[0]);
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			return(1);
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		}
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	}
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	if ( ! argv[i] ) {
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		Usage(argv[0]);
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		return(1);
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	}
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	/* Initialize the SDL library */
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	if ( SDL_Init(SDL_INIT_AUDIO) < 0 ) {
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		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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		return(255);
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	}
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	atexit(CleanUp);
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	signal(SIGINT, IntHandler);
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	signal(SIGTERM, exit);
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	/* Open the audio device */
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	if (Mix_OpenAudio(audio_rate, audio_format, audio_channels, audio_buffers) < 0) {
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		fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError());
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		return(2);
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	} else {
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		Mix_QuerySpec(&audio_rate, &audio_format, &audio_channels);
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		printf("Opened audio at %d Hz %d bit %s (%s), %d bytes audio buffer\n", audio_rate,
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			(audio_format&0xFF),
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			(audio_channels > 2) ? "surround" : (audio_channels > 1) ? "stereo" : "mono", 
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			(audio_format&0x1000) ? "BE" : "LE",
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			audio_buffers );
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	}
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	audio_open = 1;
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	/* Set the music volume */
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	Mix_VolumeMusic(audio_volume);
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	/* Set the external music player, if any */
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	Mix_SetMusicCMD(getenv("MUSIC_CMD"));
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	while (argv[i]) {
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		next_track = 0;
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		/* Load the requested music file */
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		if ( rwops ) {
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			rwfp = SDL_RWFromFile(argv[i], "rb");
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			music = Mix_LoadMUS_RW(rwfp);
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		} else {
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			music = Mix_LoadMUS(argv[i]);
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		}
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		if ( music == NULL ) {
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			fprintf(stderr, "Couldn't load %s: %s\n",
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				argv[i], SDL_GetError());
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			return(2);
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		}
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		/* Play and then exit */
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		printf("Playing %s\n", argv[i]);
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		Mix_FadeInMusic(music,looping,2000);
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		while ( !next_track && (Mix_PlayingMusic() || Mix_PausedMusic()) ) {
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			if(interactive)
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				Menu();
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			else
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				SDL_Delay(100);
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		}
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		Mix_FreeMusic(music);
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		if ( rwops ) {
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			SDL_FreeRW(rwfp);
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		}
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		music = NULL;
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		/* If the user presses Ctrl-C more than once, exit. */
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		SDL_Delay(500);
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		if ( next_track > 1 ) break;
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		i++;
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	}
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	return(0);
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}