ref: 33304ee6ff09806002181e6b739e2a4859be1ade
dir: /src/i_sound.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 sound. // //----------------------------------------------------------------------------- #include <stdio.h> #include <stdlib.h> #include <SDL.h> #include <SDL_mixer.h> #ifndef _WIN32 #include <unistd.h> #endif #include "memio.h" #include "mus2mid.h" #include "z_zone.h" #include "i_system.h" #include "i_sound.h" #include "deh_main.h" #include "m_argv.h" #include "m_misc.h" #include "m_swap.h" #include "w_wad.h" #include "doomdef.h" #define NUM_CHANNELS 16 #define MAXMIDLENGTH (96 * 1024) enum { SNDDEVICE_NONE = 0, SNDDEVICE_PCSPEAKER = 1, SNDDEVICE_ADLIB = 2, SNDDEVICE_SB = 3, SNDDEVICE_PAS = 4, SNDDEVICE_GUS = 5, SNDDEVICE_WAVEBLASTER = 6, SNDDEVICE_SOUNDCANVAS = 7, SNDDEVICE_GENMIDI = 8, SNDDEVICE_AWE32 = 9, }; extern int snd_sfxdevice; extern int snd_musicdevice; static boolean nosfxparm; static boolean nomusicparm; static boolean sound_initialised = false; static boolean music_initialised = false; static Mix_Chunk sound_chunks[NUMSFX]; static int channels_playing[NUM_CHANNELS]; int snd_musicdevice = SNDDEVICE_SB; int snd_sfxdevice = SNDDEVICE_SB; // When a sound stops, check if it is still playing. If it is not, // we can mark the sound data as CACHE to be freed back for other // means. void ReleaseSoundOnChannel(int channel) { int i; int id = channels_playing[channel]; if (!id) return; channels_playing[channel] = sfx_None; for (i=0; i<NUM_CHANNELS; ++i) { // Playing on this channel? if so, don't release. if (channels_playing[i] == id) return; } // Not used on any channel, and can be safely released Z_ChangeTag(sound_chunks[id].abuf, PU_CACHE); } // Expands the 11025Hz, 8bit, mono sound effects in Doom to // 22050Hz, 16bit stereo static void ExpandSoundData(byte *data, int samplerate, int length, Mix_Chunk *destination) { byte *expanded = (byte *) destination->abuf; int expanded_length; int expand_ratio; int i; if (samplerate == 11025) { // Most of Doom's sound effects are 11025Hz // need to expand to 2 channels, 11025->22050 and 8->16 bit for (i=0; i<length; ++i) { Uint16 sample; sample = data[i] | (data[i] << 8); sample -= 32768; expanded[i * 8] = expanded[i * 8 + 2] = expanded[i * 8 + 4] = expanded[i * 8 + 6] = sample & 0xff; expanded[i * 8 + 1] = expanded[i * 8 + 3] = expanded[i * 8 + 5] = expanded[i * 8 + 7] = (sample >> 8) & 0xff; } } else if (samplerate == 22050) { for (i=0; i<length; ++i) { Uint16 sample; sample = data[i] | (data[i] << 8); sample -= 32768; expanded[i * 4] = expanded[i * 4 + 2] = sample & 0xff; expanded[i * 4 + 1] = expanded[i * 4 + 3] = (sample >> 8) & 0xff; } } else { // Generic expansion function for all other sample rates // number of samples in the converted sound expanded_length = (length * 22050) / samplerate; expand_ratio = (length << 8) / expanded_length; for (i=0; i<expanded_length; ++i) { Uint16 sample; int src; src = (i * expand_ratio) >> 8; sample = data[src] | (data[src] << 8); sample -= 32768; // expand 8->16 bits, mono->stereo expanded[i * 4] = expanded[i * 4 + 2] = sample & 0xff; expanded[i * 4 + 1] = expanded[i * 4 + 3] = (sample >> 8) & 0xff; } } } // Load and convert a sound effect // Returns true if successful static boolean CacheSFX(int sound) { int lumpnum; int lumplen; int samplerate; int length; int expanded_length; byte *data; // need to load the sound lumpnum = I_GetSfxLumpNum(&S_sfx[sound]); data = W_CacheLumpNum(lumpnum, PU_STATIC); lumplen = W_LumpLength(lumpnum); // Check the header, and ensure this is a valid sound if (lumplen < 8 || data[0] != 0x03 || data[1] != 0x00 || data[6] != 0x00 || data[7] != 0x00) { // Invalid sound return false; } samplerate = (data[3] << 8) | data[2]; length = (data[5] << 8) | data[4]; // If the header specifies that the length of the sound is greater than // the length of the lump itself, this is an invalid sound lump if (length - 8 > lumplen) { return false; } expanded_length = (length * 22050) / (samplerate / 4); sound_chunks[sound].allocated = 1; sound_chunks[sound].alen = expanded_length; sound_chunks[sound].abuf = Z_Malloc(expanded_length, PU_STATIC, &sound_chunks[sound].abuf); sound_chunks[sound].volume = MIX_MAX_VOLUME; ExpandSoundData(data + 8, samplerate, length, &sound_chunks[sound]); // don't need the original lump any more Z_ChangeTag(data, PU_CACHE); return true; } static Mix_Chunk *getsfx(int sound) { if (sound_chunks[sound].abuf == NULL) { if (!CacheSFX(sound)) return NULL; } else { // don't free the sound while it is playing! Z_ChangeTag(sound_chunks[sound].abuf, PU_STATIC); } return &sound_chunks[sound]; } // // SFX API // Note: this was called by S_Init. // However, whatever they did in the // old DPMS based DOS version, this // were simply dummies in the Linux // version. // See soundserver initdata(). // void I_SetChannels() { } void I_SetSfxVolume(int volume) { // Unused } // // Retrieve the raw data lump index // for a given SFX name. // int I_GetSfxLumpNum(sfxinfo_t* sfx) { char namebuf[9]; sprintf(namebuf, "ds%s", DEH_String(sfx->name)); return W_GetNumForName(namebuf); } // // Starting a sound means adding it // to the current list of active sounds // in the internal channels. // As the SFX info struct contains // e.g. a pointer to the raw data, // it is ignored. // As our sound handling does not handle // priority, it is ignored. // Pitching (that is, increased speed of playback) // is set, but currently not used by mixing. // int I_StartSound ( int id, int channel, int vol, int sep, int pitch, int priority ) { Mix_Chunk *chunk; if (!sound_initialised) return 0; // Release a sound effect if there is already one playing // on this channel ReleaseSoundOnChannel(channel); // Get the sound data chunk = getsfx(id); if (chunk == NULL) { return -1; } // play sound Mix_PlayChannelTimed(channel, chunk, 0, -1); channels_playing[channel] = id; // set separation, etc. I_UpdateSoundParams(channel, vol, sep, pitch); return channel; } void I_StopSound (int handle) { if (!sound_initialised) return; Mix_HaltChannel(handle); // Sound data is no longer needed; release the // sound data being used for this channel ReleaseSoundOnChannel(handle); } int I_SoundIsPlaying(int handle) { if (!sound_initialised) return false; if (handle < 0) return false; return Mix_Playing(handle); } // // Periodically called to update the sound system // void I_UpdateSound( void ) { int i; if (!sound_initialised) return; // Check all channels to see if a sound has finished for (i=0; i<NUM_CHANNELS; ++i) { if (channels_playing[i] && !I_SoundIsPlaying(i)) { // Sound has finished playing on this channel, // but sound data has not been released to cache ReleaseSoundOnChannel(i); } } } // // This would be used to write out the mixbuffer // during each game loop update. // Updates sound buffer and audio device at runtime. // It is called during Timer interrupt with SNDINTR. // Mixing now done synchronous, and // only output be done asynchronous? // void I_SubmitSound(void) { } void I_UpdateSoundParams ( int handle, int vol, int sep, int pitch) { int left, right; if (!sound_initialised) return; left = ((254 - sep) * vol) / 127; right = ((sep) * vol) / 127; Mix_SetPanning(handle, left, right); } void I_ShutdownSound(void) { if (!sound_initialised && !music_initialised) return; Mix_CloseAudio(); SDL_QuitSubSystem(SDL_INIT_AUDIO); } void I_InitSound() { int i; // No sounds yet for (i=0; i<NUMSFX; ++i) { sound_chunks[i].abuf = NULL; } for (i=0; i<NUM_CHANNELS; ++i) { channels_playing[i] = sfx_None; } nomusicparm = M_CheckParm("-nomusic") > 0 || M_CheckParm("-nosound") > 0 || snd_musicdevice < SNDDEVICE_ADLIB; nosfxparm = M_CheckParm("-nosfx") > 0 || M_CheckParm("-nosound") > 0 || snd_sfxdevice < SNDDEVICE_SB; // If music or sound is going to play, we need to at least // initialise SDL if (nomusicparm && nosfxparm) return; if (SDL_Init(SDL_INIT_AUDIO) < 0) { fprintf(stderr, "Unable to set up sound.\n"); return; } if (Mix_OpenAudio(22050, AUDIO_S16LSB, 2, 1024) < 0) { fprintf(stderr, "Error initialising SDL_mixer: %s\n", SDL_GetError()); return; } Mix_AllocateChannels(NUM_CHANNELS); SDL_PauseAudio(0); if (!nomusicparm) music_initialised = true; if (!nosfxparm) sound_initialised = true; } // // MUSIC API. // void I_InitMusic(void) { } void I_ShutdownMusic(void) { music_initialised = false; } static boolean musicpaused = false; static int currentMusicVolume; // // 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 = (currentMusicVolume * MIX_MAX_VOLUME) / 127; Mix_VolumeMusic(vol); } // MUSIC API - dummy. Some code from DOS version. void I_SetMusicVolume(int volume) { // Internal state variable. currentMusicVolume = volume; UpdateMusicVolume(); } void I_PlaySong(void *handle, int 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); } void I_PauseSong (void *handle) { if (!music_initialised) return; musicpaused = true; UpdateMusicVolume(); } void I_ResumeSong (void *handle) { if (!music_initialised) return; musicpaused = false; UpdateMusicVolume(); } void I_StopSong(void *handle) { if (!music_initialised) return; Mix_HaltMusic(); } void I_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; } void *I_RegisterSong(void *data, int len) { char filename[64]; Mix_Music *music; if (!music_initialised) return NULL; // MUS files begin with "MUS" // Reject anything which doesnt have this signature #ifdef _WIN32 sprintf(filename, "doom.mid"); #else sprintf(filename, "/tmp/doom-%i.mid", getpid()); #endif 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\n"); } // remove file now remove(filename); return music; } // Is the song playing? boolean I_QrySongPlaying(void *handle) { if (!music_initialised) return false; return Mix_PlayingMusic(); }