ref: 7c747c3d576521f2e1773fd285c0d2c7cb32aca8
dir: /src/i_sdlmusic.c/
// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005 Simon Howard
//
// 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.
//
// DESCRIPTION:
// System interface for music.
//
//-----------------------------------------------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include "SDL.h"
#include "SDL_mixer.h"
#include "doomtype.h"
#include "memio.h"
#include "mus2mid.h"
#include "deh_str.h"
#include "i_sound.h"
#include "m_misc.h"
#include "w_wad.h"
#include "z_zone.h"
#define MAXMIDLENGTH (96 * 1024)
static boolean music_initialised = false;
// If this is true, this module initialised SDL sound and has the
// responsibility to shut it down
static boolean sdl_was_initialised = false;
static boolean musicpaused = false;
static int current_music_volume;
// Shutdown music
static void I_SDL_ShutdownMusic(void)
{
if (music_initialised)
{
Mix_HaltMusic();
music_initialised = false;
if (sdl_was_initialised)
{
Mix_CloseAudio();
SDL_QuitSubSystem(SDL_INIT_AUDIO);
sdl_was_initialised = false;
}
}
}
static boolean SDLIsInitialised(void)
{
int freq, channels;
Uint16 format;
return Mix_QuerySpec(&freq, &format, &channels) != 0;
}
// Initialise music subsystem
static boolean I_SDL_InitMusic(void)
{
// When trying to run with music enabled on OSX, display
// a warning message.
#ifdef __APPLE__
printf("\n"
" *** WARNING ***\n"
" Music playback on OSX may cause crashes and\n"
" is disabled by default.\n"
"\n");
#endif
// If SDL_mixer is not initialised, we have to initialise it
// and have the responsibility to shut it down later on.
if (!SDLIsInitialised())
{
if (SDL_Init(SDL_INIT_AUDIO) < 0)
{
fprintf(stderr, "Unable to set up sound.\n");
return false;
}
if (Mix_OpenAudio(snd_samplerate, AUDIO_S16SYS, 2, 1024) < 0)
{
fprintf(stderr, "Error initialising SDL_mixer: %s\n", Mix_GetError());
SDL_QuitSubSystem(SDL_INIT_AUDIO);
return false;
}
SDL_PauseAudio(0);
sdl_was_initialised = true;
}
music_initialised = true;
return true;
}
//
// SDL_mixer's native MIDI music playing does not pause properly.
// As a workaround, set the volume to 0 when paused.
//
static void UpdateMusicVolume(void)
{
int vol;
if (musicpaused)
{
vol = 0;
}
else
{
vol = (current_music_volume * MIX_MAX_VOLUME) / 127;
}
Mix_VolumeMusic(vol);
}
// Set music volume (0 - 127)
static void I_SDL_SetMusicVolume(int volume)
{
// Internal state variable.
current_music_volume = volume;
UpdateMusicVolume();
}
// Start playing a mid
static void I_SDL_PlaySong(void *handle, boolean looping)
{
Mix_Music *music = (Mix_Music *) handle;
int loops;
if (!music_initialised)
{
return;
}
if (handle == NULL)
{
return;
}
if (looping)
{
loops = -1;
}
else
{
loops = 1;
}
Mix_PlayMusic(music, loops);
}
static void I_SDL_PauseSong(void)
{
if (!music_initialised)
{
return;
}
musicpaused = true;
UpdateMusicVolume();
}
static void I_SDL_ResumeSong(void)
{
if (!music_initialised)
{
return;
}
musicpaused = false;
UpdateMusicVolume();
}
static void I_SDL_StopSong(void)
{
if (!music_initialised)
{
return;
}
Mix_HaltMusic();
}
static void I_SDL_UnRegisterSong(void *handle)
{
Mix_Music *music = (Mix_Music *) handle;
if (!music_initialised)
{
return;
}
if (handle == NULL)
{
return;
}
Mix_FreeMusic(music);
}
// Determine whether memory block is a .mid file
static boolean IsMid(byte *mem, int len)
{
return len > 4 && !memcmp(mem, "MThd", 4);
}
static boolean ConvertMus(byte *musdata, int len, char *filename)
{
MEMFILE *instream;
MEMFILE *outstream;
void *outbuf;
size_t outbuf_len;
int result;
instream = mem_fopen_read(musdata, len);
outstream = mem_fopen_write();
result = mus2mid(instream, outstream);
if (result == 0)
{
mem_get_buf(outstream, &outbuf, &outbuf_len);
M_WriteFile(filename, outbuf, outbuf_len);
}
mem_fclose(instream);
mem_fclose(outstream);
return result;
}
static void *I_SDL_RegisterSong(void *data, int len)
{
char *filename;
Mix_Music *music;
if (!music_initialised)
{
return NULL;
}
// MUS files begin with "MUS"
// Reject anything which doesnt have this signature
filename = M_TempFile("doom.mid");
if (IsMid(data, len) && len < MAXMIDLENGTH)
{
M_WriteFile(filename, data, len);
}
else
{
// Assume a MUS file and try to convert
ConvertMus(data, len, filename);
}
// Load the MIDI
music = Mix_LoadMUS(filename);
if (music == NULL)
{
// Failed to load
fprintf(stderr, "Error loading midi: %s\n", Mix_GetError());
}
// remove file now
remove(filename);
Z_Free(filename);
return music;
}
// Is the song playing?
static boolean I_SDL_MusicIsPlaying(void)
{
if (!music_initialised)
{
return false;
}
return Mix_PlayingMusic();
}
static snddevice_t music_sdl_devices[] =
{
SNDDEVICE_ADLIB,
SNDDEVICE_SB,
SNDDEVICE_PAS,
SNDDEVICE_GUS,
SNDDEVICE_WAVEBLASTER,
SNDDEVICE_SOUNDCANVAS,
SNDDEVICE_GENMIDI,
SNDDEVICE_AWE32,
};
music_module_t music_sdl_module =
{
music_sdl_devices,
arrlen(music_sdl_devices),
I_SDL_InitMusic,
I_SDL_ShutdownMusic,
I_SDL_SetMusicVolume,
I_SDL_PauseSong,
I_SDL_ResumeSong,
I_SDL_RegisterSong,
I_SDL_UnRegisterSong,
I_SDL_PlaySong,
I_SDL_StopSong,
I_SDL_MusicIsPlaying,
};