playmus.c
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上传日期:2022-07-21
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文件大小:5k
- /*
- PLAYMUS: A test application for the SDL mixer library.
- Copyright (C) 1997-2009 Sam Lantinga
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later version.
- This library 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
- Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- Sam Lantinga
- slouken@libsdl.org
- */
- /* $Id: playmus.c 4211 2008-12-08 00:27:32Z slouken $ */
- #include <stdlib.h>
- #include <stdio.h>
- #include <string.h>
- #include <signal.h>
- #ifdef unix
- #include <unistd.h>
- #endif
- #include "SDL.h"
- #include "SDL_mixer.h"
- static int audio_open = 0;
- static Mix_Music *music = NULL;
- static int next_track = 0;
- void CleanUp(int exitcode)
- {
- if( Mix_PlayingMusic() ) {
- Mix_FadeOutMusic(1500);
- SDL_Delay(1500);
- }
- if ( music ) {
- Mix_FreeMusic(music);
- music = NULL;
- }
- if ( audio_open ) {
- Mix_CloseAudio();
- audio_open = 0;
- }
- SDL_Quit();
- exit(exitcode);
- }
- void Usage(char *argv0)
- {
- fprintf(stderr, "Usage: %s [-i] [-l] [-8] [-r rate] [-c channels] [-b buffers] [-v N] [-rwops] <musicfile>n", argv0);
- }
- void Menu(void)
- {
- char buf[10];
- printf("Available commands: (p)ause (r)esume (h)alt volume(v#) > ");
- fflush(stdin);
- scanf("%s",buf);
- switch(buf[0]){
- case 'p': case 'P':
- Mix_PauseMusic();
- break;
- case 'r': case 'R':
- Mix_ResumeMusic();
- break;
- case 'h': case 'H':
- Mix_HaltMusic();
- break;
- case 'v': case 'V':
- Mix_VolumeMusic(atoi(buf+1));
- break;
- }
- printf("Music playing: %s Paused: %sn", Mix_PlayingMusic() ? "yes" : "no",
- Mix_PausedMusic() ? "yes" : "no");
- }
- void IntHandler(int sig)
- {
- switch (sig) {
- case SIGINT:
- next_track++;
- break;
- }
- }
- int main(int argc, char *argv[])
- {
- SDL_RWops *rwfp;
- int audio_rate;
- Uint16 audio_format;
- int audio_channels;
- int audio_buffers;
- int audio_volume = MIX_MAX_VOLUME;
- int looping = 0;
- int interactive = 0;
- int rwops = 0;
- int i;
- /* Initialize variables */
- audio_rate = 22050;
- audio_format = AUDIO_S16;
- audio_channels = 2;
- audio_buffers = 4096;
- /* Check command line usage */
- for ( i=1; argv[i] && (*argv[i] == '-'); ++i ) {
- if ( (strcmp(argv[i], "-r") == 0) && argv[i+1] ) {
- ++i;
- audio_rate = atoi(argv[i]);
- } else
- if ( strcmp(argv[i], "-m") == 0 ) {
- audio_channels = 1;
- } else
- if ( (strcmp(argv[i], "-c") == 0) && argv[i+1] ) {
- ++i;
- audio_channels = atoi(argv[i]);
- } else
- if ( (strcmp(argv[i], "-b") == 0) && argv[i+1] ) {
- ++i;
- audio_buffers = atoi(argv[i]);
- } else
- if ( (strcmp(argv[i], "-v") == 0) && argv[i+1] ) {
- ++i;
- audio_volume = atoi(argv[i]);
- } else
- if ( strcmp(argv[i], "-l") == 0 ) {
- looping = -1;
- } else
- if ( strcmp(argv[i], "-i") == 0 ) {
- interactive = 1;
- } else
- if ( strcmp(argv[i], "-8") == 0 ) {
- audio_format = AUDIO_U8;
- } else
- if ( strcmp(argv[i], "-rwops") == 0 ) {
- rwops = 1;
- } else {
- Usage(argv[0]);
- return(1);
- }
- }
- if ( ! argv[i] ) {
- Usage(argv[0]);
- return(1);
- }
- /* Initialize the SDL library */
- if ( SDL_Init(SDL_INIT_AUDIO) < 0 ) {
- fprintf(stderr, "Couldn't initialize SDL: %sn",SDL_GetError());
- return(255);
- }
- signal(SIGINT, IntHandler);
- signal(SIGTERM, CleanUp);
- /* Open the audio device */
- if (Mix_OpenAudio(audio_rate, audio_format, audio_channels, audio_buffers) < 0) {
- fprintf(stderr, "Couldn't open audio: %sn", SDL_GetError());
- return(2);
- } else {
- Mix_QuerySpec(&audio_rate, &audio_format, &audio_channels);
- printf("Opened audio at %d Hz %d bit %s (%s), %d bytes audio buffern", audio_rate,
- (audio_format&0xFF),
- (audio_channels > 2) ? "surround" : (audio_channels > 1) ? "stereo" : "mono",
- (audio_format&0x1000) ? "BE" : "LE",
- audio_buffers );
- }
- audio_open = 1;
- /* Set the music volume */
- Mix_VolumeMusic(audio_volume);
- /* Set the external music player, if any */
- Mix_SetMusicCMD(getenv("MUSIC_CMD"));
- while (argv[i]) {
- next_track = 0;
-
- /* Load the requested music file */
- if ( rwops ) {
- rwfp = SDL_RWFromFile(argv[i], "rb");
- music = Mix_LoadMUS_RW(rwfp);
- } else {
- music = Mix_LoadMUS(argv[i]);
- }
- if ( music == NULL ) {
- fprintf(stderr, "Couldn't load %s: %sn",
- argv[i], SDL_GetError());
- CleanUp(2);
- }
-
- /* Play and then exit */
- printf("Playing %sn", argv[i]);
- Mix_FadeInMusic(music,looping,2000);
- while ( !next_track && (Mix_PlayingMusic() || Mix_PausedMusic()) ) {
- if(interactive)
- Menu();
- else
- SDL_Delay(100);
- }
- Mix_FreeMusic(music);
- if ( rwops ) {
- SDL_FreeRW(rwfp);
- }
- music = NULL;
- /* If the user presses Ctrl-C more than once, exit. */
- SDL_Delay(500);
- if ( next_track > 1 ) break;
-
- i++;
- }
- CleanUp(0);
- /* Not reached, but fixes compiler warnings */
- return 0;
- }