| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Library General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2 of the License, or (at your option) any later version. |
| 9 | |
| 10 | This library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Library General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Library General Public |
| 16 | License along with this library; if not, write to the Free |
| 17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 23 | |
| 24 | /* Tru64 UNIX MME support */ |
| 25 | #include <mme_api.h> |
| 26 | |
| 27 | #include "SDL_timer.h" |
| 28 | #include "SDL_audio.h" |
| 29 | #include "../SDL_audio_c.h" |
| 30 | #include "SDL_mmeaudio.h" |
| 31 | |
| 32 | static BOOL inUse[NUM_BUFFERS]; |
| 33 | |
| 34 | /* Audio driver functions */ |
| 35 | static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec); |
| 36 | static void MME_WaitAudio(_THIS); |
| 37 | static Uint8 *MME_GetAudioBuf(_THIS); |
| 38 | static void MME_PlayAudio(_THIS); |
| 39 | static void MME_WaitDone(_THIS); |
| 40 | static void MME_CloseAudio(_THIS); |
| 41 | |
| 42 | /* Audio driver bootstrap functions */ |
| 43 | static int Audio_Available(void) |
| 44 | { |
| 45 | return(1); |
| 46 | } |
| 47 | |
| 48 | static void Audio_DeleteDevice(SDL_AudioDevice *device) |
| 49 | { |
| 50 | if ( device ) { |
| 51 | if ( device->hidden ) { |
| 52 | SDL_free(device->hidden); |
| 53 | device->hidden = NULL; |
| 54 | } |
| 55 | SDL_free(device); |
| 56 | device = NULL; |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | static SDL_AudioDevice *Audio_CreateDevice(int devindex) |
| 61 | { |
| 62 | SDL_AudioDevice *this; |
| 63 | |
| 64 | /* Initialize all variables that we clean on shutdown */ |
| 65 | this = SDL_malloc(sizeof(SDL_AudioDevice)); |
| 66 | if ( this ) { |
| 67 | SDL_memset(this, 0, (sizeof *this)); |
| 68 | this->hidden = SDL_malloc((sizeof *this->hidden)); |
| 69 | } |
| 70 | if ( (this == NULL) || (this->hidden == NULL) ) { |
| 71 | SDL_OutOfMemory(); |
| 72 | if ( this ) { |
| 73 | SDL_free(this); |
| 74 | } |
| 75 | return(0); |
| 76 | } |
| 77 | SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 78 | /* Set the function pointers */ |
| 79 | this->OpenAudio = MME_OpenAudio; |
| 80 | this->WaitAudio = MME_WaitAudio; |
| 81 | this->PlayAudio = MME_PlayAudio; |
| 82 | this->GetAudioBuf = MME_GetAudioBuf; |
| 83 | this->WaitDone = MME_WaitDone; |
| 84 | this->CloseAudio = MME_CloseAudio; |
| 85 | this->free = Audio_DeleteDevice; |
| 86 | |
| 87 | return this; |
| 88 | } |
| 89 | |
| 90 | AudioBootStrap MMEAUDIO_bootstrap = { |
| 91 | "waveout", "Tru64 MME WaveOut", |
| 92 | Audio_Available, Audio_CreateDevice |
| 93 | }; |
| 94 | |
| 95 | static void SetMMerror(char *function, MMRESULT code) |
| 96 | { |
| 97 | int len; |
| 98 | char errbuf[MAXERRORLENGTH]; |
| 99 | |
| 100 | SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function); |
| 101 | len = SDL_strlen(errbuf); |
| 102 | waveOutGetErrorText(code, errbuf+len, MAXERRORLENGTH-len); |
| 103 | SDL_SetError("%s",errbuf); |
| 104 | } |
| 105 | |
| 106 | static void CALLBACK MME_CALLBACK(HWAVEOUT hwo, |
| 107 | UINT uMsg, |
| 108 | DWORD dwInstance, |
| 109 | LPARAM dwParam1, |
| 110 | LPARAM dwParam2) |
| 111 | { |
| 112 | WAVEHDR *wp = (WAVEHDR *) dwParam1; |
| 113 | |
| 114 | if ( uMsg == WOM_DONE ) |
| 115 | inUse[wp->dwUser] = FALSE; |
| 116 | } |
| 117 | |
| 118 | static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec) |
| 119 | { |
| 120 | MMRESULT result; |
| 121 | int i; |
| 122 | |
| 123 | mixbuf = NULL; |
| 124 | |
| 125 | /* Set basic WAVE format parameters */ |
| 126 | shm = mmeAllocMem(sizeof(*shm)); |
| 127 | if ( shm == NULL ) { |
| 128 | SDL_SetError("Out of memory: shm"); |
| 129 | return(-1); |
| 130 | } |
| 131 | shm->sound = 0; |
| 132 | shm->wFmt.wf.wFormatTag = WAVE_FORMAT_PCM; |
| 133 | |
| 134 | /* Determine the audio parameters from the AudioSpec */ |
| 135 | switch ( spec->format & 0xFF ) { |
| 136 | case 8: |
| 137 | /* Unsigned 8 bit audio data */ |
| 138 | spec->format = AUDIO_U8; |
| 139 | shm->wFmt.wBitsPerSample = 8; |
| 140 | break; |
| 141 | case 16: |
| 142 | /* Signed 16 bit audio data */ |
| 143 | spec->format = AUDIO_S16; |
| 144 | shm->wFmt.wBitsPerSample = 16; |
| 145 | break; |
| 146 | default: |
| 147 | SDL_SetError("Unsupported audio format"); |
| 148 | return(-1); |
| 149 | } |
| 150 | |
| 151 | shm->wFmt.wf.nChannels = spec->channels; |
| 152 | shm->wFmt.wf.nSamplesPerSec = spec->freq; |
| 153 | shm->wFmt.wf.nBlockAlign = |
| 154 | shm->wFmt.wf.nChannels * shm->wFmt.wBitsPerSample / 8; |
| 155 | shm->wFmt.wf.nAvgBytesPerSec = |
| 156 | shm->wFmt.wf.nSamplesPerSec * shm->wFmt.wf.nBlockAlign; |
| 157 | |
| 158 | /* Check the buffer size -- minimum of 1/4 second (word aligned) */ |
| 159 | if ( spec->samples < (spec->freq/4) ) |
| 160 | spec->samples = ((spec->freq/4)+3)&~3; |
| 161 | |
| 162 | /* Update the fragment size as size in bytes */ |
| 163 | SDL_CalculateAudioSpec(spec); |
| 164 | |
| 165 | /* Open the audio device */ |
| 166 | result = waveOutOpen(&(shm->sound), |
| 167 | WAVE_MAPPER, |
| 168 | &(shm->wFmt.wf), |
| 169 | MME_CALLBACK, |
| 170 | NULL, |
| 171 | (CALLBACK_FUNCTION|WAVE_OPEN_SHAREABLE)); |
| 172 | if ( result != MMSYSERR_NOERROR ) { |
| 173 | SetMMerror("waveOutOpen()", result); |
| 174 | return(-1); |
| 175 | } |
| 176 | |
| 177 | /* Create the sound buffers */ |
| 178 | mixbuf = (Uint8 *)mmeAllocBuffer(NUM_BUFFERS * (spec->size)); |
| 179 | if ( mixbuf == NULL ) { |
| 180 | SDL_SetError("Out of memory: mixbuf"); |
| 181 | return(-1); |
| 182 | } |
| 183 | |
| 184 | for (i = 0; i < NUM_BUFFERS; i++) { |
| 185 | shm->wHdr[i].lpData = &mixbuf[i * (spec->size)]; |
| 186 | shm->wHdr[i].dwBufferLength = spec->size; |
| 187 | shm->wHdr[i].dwFlags = 0; |
| 188 | shm->wHdr[i].dwUser = i; |
| 189 | shm->wHdr[i].dwLoops = 0; /* loop control counter */ |
| 190 | shm->wHdr[i].lpNext = NULL; /* reserved for driver */ |
| 191 | shm->wHdr[i].reserved = 0; |
| 192 | inUse[i] = FALSE; |
| 193 | } |
| 194 | next_buffer = 0; |
| 195 | return 0; |
| 196 | } |
| 197 | |
| 198 | static void MME_WaitAudio(_THIS) |
| 199 | { |
| 200 | while ( inUse[next_buffer] ) { |
| 201 | mmeWaitForCallbacks(); |
| 202 | mmeProcessCallbacks(); |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | static Uint8 *MME_GetAudioBuf(_THIS) |
| 207 | { |
| 208 | Uint8 *retval; |
| 209 | |
| 210 | inUse[next_buffer] = TRUE; |
| 211 | retval = (Uint8 *)(shm->wHdr[next_buffer].lpData); |
| 212 | return retval; |
| 213 | } |
| 214 | |
| 215 | static void MME_PlayAudio(_THIS) |
| 216 | { |
| 217 | /* Queue it up */ |
| 218 | waveOutWrite(shm->sound, &(shm->wHdr[next_buffer]), sizeof(WAVEHDR)); |
| 219 | next_buffer = (next_buffer+1)%NUM_BUFFERS; |
| 220 | } |
| 221 | |
| 222 | static void MME_WaitDone(_THIS) |
| 223 | { |
| 224 | MMRESULT result; |
| 225 | int i; |
| 226 | |
| 227 | if ( shm->sound ) { |
| 228 | for (i = 0; i < NUM_BUFFERS; i++) |
| 229 | while ( inUse[i] ) { |
| 230 | mmeWaitForCallbacks(); |
| 231 | mmeProcessCallbacks(); |
| 232 | } |
| 233 | result = waveOutReset(shm->sound); |
| 234 | if ( result != MMSYSERR_NOERROR ) |
| 235 | SetMMerror("waveOutReset()", result); |
| 236 | mmeProcessCallbacks(); |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | static void MME_CloseAudio(_THIS) |
| 241 | { |
| 242 | MMRESULT result; |
| 243 | |
| 244 | if ( mixbuf ) { |
| 245 | result = mmeFreeBuffer(mixbuf); |
| 246 | if (result != MMSYSERR_NOERROR ) |
| 247 | SetMMerror("mmeFreeBuffer", result); |
| 248 | mixbuf = NULL; |
| 249 | } |
| 250 | |
| 251 | if ( shm ) { |
| 252 | if ( shm->sound ) { |
| 253 | result = waveOutClose(shm->sound); |
| 254 | if (result != MMSYSERR_NOERROR ) |
| 255 | SetMMerror("waveOutClose()", result); |
| 256 | mmeProcessCallbacks(); |
| 257 | } |
| 258 | result = mmeFreeMem(shm); |
| 259 | if (result != MMSYSERR_NOERROR ) |
| 260 | SetMMerror("mmeFreeMem()", result); |
| 261 | shm = NULL; |
| 262 | } |
| 263 | } |
| 264 | |