libao2/ao_oss.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3
   4 #include <sys/ioctl.h>
   5 #include <unistd.h>
   6 #include <sys/time.h>
   7 #include <sys/types.h>
   8 #include <sys/stat.h>
   9 #include <fcntl.h>
  10 #include <errno.h>
  11 #include <string.h>
  12
  13 #include "config.h"
  14 #include "mp_msg.h"
  15 #include "mixer.h"
  16 #include "help_mp.h"
  17
  18 #ifdef HAVE_SYS_SOUNDCARD_H
  19 #include <sys/soundcard.h>
  20 #else
  21 #ifdef HAVE_SOUNDCARD_H
  22 #include <soundcard.h>
  23 #endif
  24 #endif
  25
  26 #include "libaf/af_format.h"
  27
  28 #include "audio_out.h"
  29 #include "audio_out_internal.h"
  30
  31 static ao_info_t info =
  32 {
  33         "OSS/ioctl audio output",
  34         "oss",
  35         "A'rpi",
  36         ""
  37 };
  38
  39 /* Support for >2 output channels added 2001-11-25 - Steve Davies <steve@daviesfam.org> */
  40
  41 LIBAO_EXTERN(oss)
  42
  43 static int format2oss(int format)
  44 {
  45     switch(format)
  46     {
  47     case AF_FORMAT_U8: return AFMT_U8;
  48     case AF_FORMAT_S8: return AFMT_S8;
  49     case AF_FORMAT_U16_LE: return AFMT_U16_LE;
  50     case AF_FORMAT_U16_BE: return AFMT_U16_BE;
  51     case AF_FORMAT_S16_LE: return AFMT_S16_LE;
  52     case AF_FORMAT_S16_BE: return AFMT_S16_BE;
  53 #ifdef AFMT_U24_LE
  54     case AF_FORMAT_U24_LE: return AFMT_U24_LE;
  55 #endif
  56 #ifdef AFMT_U24_BE
  57     case AF_FORMAT_U24_BE: return AFMT_U24_BE;
  58 #endif
  59 #ifdef AFMT_S24_LE
  60     case AF_FORMAT_S24_LE: return AFMT_S24_LE;
  61 #endif
  62 #ifdef AFMT_S24_BE
  63     case AF_FORMAT_S24_BE: return AFMT_S24_BE;
  64 #endif
  65 #ifdef AFMT_U32_LE
  66     case AF_FORMAT_U32_LE: return AFMT_U32_LE;
  67 #endif
  68 #ifdef AFMT_U32_BE
  69     case AF_FORMAT_U32_BE: return AFMT_U32_BE;
  70 #endif
  71 #ifdef AFMT_S32_LE
  72     case AF_FORMAT_S32_LE: return AFMT_S32_LE;
  73 #endif
  74 #ifdef AFMT_S32_BE
  75     case AF_FORMAT_S32_BE: return AFMT_S32_BE;
  76 #endif
  77 #ifdef AFMT_FLOAT
  78     case AF_FORMAT_FLOAT_NE: return AFMT_FLOAT;
  79 #endif
  80     // SPECIALS
  81     case AF_FORMAT_MU_LAW: return AFMT_MU_LAW;
  82     case AF_FORMAT_A_LAW: return AFMT_A_LAW;
  83     case AF_FORMAT_IMA_ADPCM: return AFMT_IMA_ADPCM;
  84 #ifdef AFMT_MPEG
  85     case AF_FORMAT_MPEG2: return AFMT_MPEG;
  86 #endif
  87 #ifdef AFMT_AC3
  88     case AF_FORMAT_AC3: return AFMT_AC3;
  89 #endif
  90     }
  91     mp_msg(MSGT_AO, MSGL_V, "OSS: Unknown/not supported internal format: %s\n", af_fmt2str_short(format));
  92     return -1;
  93 }
  94
  95 static int oss2format(int format)
  96 {
  97     switch(format)
  98     {
  99     case AFMT_U8: return AF_FORMAT_U8;
 100     case AFMT_S8: return AF_FORMAT_S8;
 101     case AFMT_U16_LE: return AF_FORMAT_U16_LE;
 102     case AFMT_U16_BE: return AF_FORMAT_U16_BE;
 103     case AFMT_S16_LE: return AF_FORMAT_S16_LE;
 104     case AFMT_S16_BE: return AF_FORMAT_S16_BE;
 105 #ifdef AFMT_U24_LE
 106     case AFMT_U24_LE: return AF_FORMAT_U24_LE;
 107 #endif
 108 #ifdef AFMT_U24_BE
 109     case AFMT_U24_BE: return AF_FORMAT_U24_BE;
 110 #endif
 111 #ifdef AFMT_S24_LE
 112     case AFMT_S24_LE: return AF_FORMAT_S24_LE;
 113 #endif
 114 #ifdef AFMT_S24_BE
 115     case AFMT_S24_BE: return AF_FORMAT_S24_BE;
 116 #endif
 117 #ifdef AFMT_U32_LE
 118     case AFMT_U32_LE: return AF_FORMAT_U32_LE;
 119 #endif
 120 #ifdef AFMT_U32_BE
 121     case AFMT_U32_BE: return AF_FORMAT_U32_BE;
 122 #endif
 123 #ifdef AFMT_S32_LE
 124     case AFMT_S32_LE: return AF_FORMAT_S32_LE;
 125 #endif
 126 #ifdef AFMT_S32_BE
 127     case AFMT_S32_BE: return AF_FORMAT_S32_BE;
 128 #endif
 129 #ifdef AFMT_FLOAT
 130     case AFMT_FLOAT: return AF_FORMAT_FLOAT_NE;
 131 #endif
 132     // SPECIALS
 133     case AFMT_MU_LAW: return AF_FORMAT_MU_LAW;
 134     case AFMT_A_LAW: return AF_FORMAT_A_LAW;
 135     case AFMT_IMA_ADPCM: return AF_FORMAT_IMA_ADPCM;
 136 #ifdef AFMT_MPEG
 137     case AFMT_MPEG: return AF_FORMAT_MPEG2;
 138 #endif
 139 #ifdef AFMT_AC3
 140     case AFMT_AC3: return AF_FORMAT_AC3;
 141 #endif
 142     }
 143     mp_msg(MSGT_GLOBAL,MSGL_ERR,MSGTR_AO_OSS_UnknownUnsupportedFormat, format);
 144     return -1;
 145 }
 146
 147 static char *dsp=PATH_DEV_DSP;
 148 static audio_buf_info zz;
 149 static int audio_fd=-1;
 150 static int prepause_space;
 151
 152 static const char *oss_mixer_device = PATH_DEV_MIXER;
 153 static int oss_mixer_channel = SOUND_MIXER_PCM;
 154
 155 // to set/get/query special features/parameters
 156 static int control(int cmd,void *arg){
 157     switch(cmd){
 158         case AOCONTROL_SET_DEVICE:
 159             dsp=(char*)arg;
 160             return CONTROL_OK;
 161         case AOCONTROL_GET_DEVICE:
 162             *(char**)arg=dsp;
 163             return CONTROL_OK;
 164 #ifdef SNDCTL_DSP_GETFMTS
 165         case AOCONTROL_QUERY_FORMAT:
 166         {
 167             int format;
 168             if (!ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &format))
 169                 if ((unsigned int)format & (unsigned long)arg)
 170                     return CONTROL_TRUE;
 171             return CONTROL_FALSE;
 172         }
 173 #endif
 174         case AOCONTROL_GET_VOLUME:
 175         case AOCONTROL_SET_VOLUME:
 176         {
 177             ao_control_vol_t *vol = (ao_control_vol_t *)arg;
 178             int fd, v, devs;
 179
 180             if(ao_data.format == AF_FORMAT_AC3)
 181                 return CONTROL_TRUE;
 182
 183             if ((fd = open(oss_mixer_device, O_RDONLY)) > 0)
 184             {
 185                 ioctl(fd, SOUND_MIXER_READ_DEVMASK, &devs);
 186                 if (devs & (1 << oss_mixer_channel))
 187                 {
 188                     if (cmd == AOCONTROL_GET_VOLUME)
 189                     {
 190                         ioctl(fd, MIXER_READ(oss_mixer_channel), &v);
 191                         vol->right = (v & 0xFF00) >> 8;
 192                         vol->left = v & 0x00FF;
 193                     }
 194                     else
 195                     {
 196                         v = ((int)vol->right << 8) | (int)vol->left;
 197                         ioctl(fd, MIXER_WRITE(oss_mixer_channel), &v);
 198                     }
 199                 }
 200                 else
 201                 {
 202                     close(fd);
 203                     return CONTROL_ERROR;
 204                 }
 205                 close(fd);
 206                 return CONTROL_OK;
 207             }
 208         }
 209         return CONTROL_ERROR;
 210     }
 211     return CONTROL_UNKNOWN;
 212 }
 213
 214 // open & setup audio device
 215 // return: 1=success 0=fail
 216 static int init(int rate,int channels,int format,int flags){
 217   char *mixer_channels [SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES;
 218   int oss_format;
 219   char *mdev = mixer_device, *mchan = mixer_channel;
 220
 221   mp_msg(MSGT_AO,MSGL_V,"ao2: %d Hz  %d chans  %s\n",rate,channels,
 222     af_fmt2str_short(format));
 223
 224   if (ao_subdevice) {
 225     char *m,*c;
 226     m = strchr(ao_subdevice,':');
 227     if(m) {
 228       c = strchr(m+1,':');
 229       if(c) {
 230         mchan = c+1;
 231         c[0] = '\0';
 232       }
 233       mdev = m+1;
 234       m[0] = '\0';
 235     }
 236     dsp = ao_subdevice;
 237   }
 238
 239   if(mdev)
 240     oss_mixer_device=mdev;
 241   else
 242     oss_mixer_device=PATH_DEV_MIXER;
 243
 244   if(mchan){
 245     int fd, devs, i;
 246
 247     if ((fd = open(oss_mixer_device, O_RDONLY)) == -1){
 248       mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantOpenMixer,
 249         oss_mixer_device, strerror(errno));
 250     }else{
 251       ioctl(fd, SOUND_MIXER_READ_DEVMASK, &devs);
 252       close(fd);
 253
 254       for (i=0; i<SOUND_MIXER_NRDEVICES; i++){
 255         if(!strcasecmp(mixer_channels[i], mchan)){
 256           if(!(devs & (1 << i))){
 257             mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_ChanNotFound,mchan);
 258             i = SOUND_MIXER_NRDEVICES+1;
 259             break;
 260           }
 261           oss_mixer_channel = i;
 262           break;
 263         }
 264       }
 265       if(i==SOUND_MIXER_NRDEVICES){
 266         mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_ChanNotFound,mchan);
 267       }
 268     }
 269   } else
 270     oss_mixer_channel = SOUND_MIXER_PCM;
 271
 272   mp_msg(MSGT_AO,MSGL_V,"audio_setup: using '%s' dsp device\n", dsp);
 273   mp_msg(MSGT_AO,MSGL_V,"audio_setup: using '%s' mixer device\n", oss_mixer_device);
 274   mp_msg(MSGT_AO,MSGL_V,"audio_setup: using '%s' mixer device\n", mixer_channels[oss_mixer_channel]);
 275
 276 #ifdef __linux__
 277   audio_fd=open(dsp, O_WRONLY | O_NONBLOCK);
 278 #else
 279   audio_fd=open(dsp, O_WRONLY);
 280 #endif
 281   if(audio_fd<0){
 282     mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantOpenDev, dsp, strerror(errno));
 283     return 0;
 284   }
 285
 286 #ifdef __linux__
 287   /* Remove the non-blocking flag */
 288   if(fcntl(audio_fd, F_SETFL, 0) < 0) {
 289    mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantMakeFd, strerror(errno));
 290    return 0;
 291   }
 292 #endif
 293
 294 #if defined(FD_CLOEXEC) && defined(F_SETFD)
 295   fcntl(audio_fd, F_SETFD, FD_CLOEXEC);
 296 #endif
 297
 298   if(format == AF_FORMAT_AC3) {
 299     ao_data.samplerate=rate;
 300     ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_data.samplerate);
 301   }
 302
 303 ac3_retry:
 304   ao_data.format=format;
 305   oss_format=format2oss(format);
 306   if (oss_format == -1) {
 307 #ifdef WORDS_BIGENDIAN
 308     oss_format=AFMT_S16_BE;
 309 #else
 310     oss_format=AFMT_S16_LE;
 311 #endif
 312     format=AF_FORMAT_S16_NE;
 313   }
 314   if( ioctl(audio_fd, SNDCTL_DSP_SETFMT, &oss_format)<0 ||
 315       oss_format != format2oss(format)) {
 316     mp_msg(MSGT_AO,MSGL_WARN, MSGTR_AO_OSS_CantSet, dsp,
 317             af_fmt2str_short(format), af_fmt2str_short(AF_FORMAT_S16_NE) );
 318     format=AF_FORMAT_S16_NE;
 319     goto ac3_retry;
 320   }
 321 #if 0
 322   if(oss_format!=format2oss(format))
 323         mp_msg(MSGT_AO,MSGL_WARN,"WARNING! Your soundcard does NOT support %s sample format! Broken audio or bad playback speed are possible! Try with '-af format'\n",audio_out_format_name(format));
 324 #endif
 325
 326   ao_data.format = oss2format(oss_format);
 327   if (ao_data.format == -1) return 0;
 328
 329   mp_msg(MSGT_AO,MSGL_V,"audio_setup: sample format: %s (requested: %s)\n",
 330     af_fmt2str_short(ao_data.format), af_fmt2str_short(format));
 331
 332   ao_data.channels = channels;
 333   if(format != AF_FORMAT_AC3) {
 334     // We only use SNDCTL_DSP_CHANNELS for >2 channels, in case some drivers don't have it
 335     if (ao_data.channels > 2) {
 336       if ( ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &ao_data.channels) == -1 ||
 337            ao_data.channels != channels ) {
 338         mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantSetChans, channels);
 339         return 0;
 340       }
 341     }
 342     else {
 343       int c = ao_data.channels-1;
 344       if (ioctl (audio_fd, SNDCTL_DSP_STEREO, &c) == -1) {
 345         mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantSetChans, ao_data.channels);
 346         return 0;
 347       }
 348       ao_data.channels=c+1;
 349     }
 350     mp_msg(MSGT_AO,MSGL_V,"audio_setup: using %d channels (requested: %d)\n", ao_data.channels, channels);
 351     // set rate
 352     ao_data.samplerate=rate;
 353     ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_data.samplerate);
 354     mp_msg(MSGT_AO,MSGL_V,"audio_setup: using %d Hz samplerate (requested: %d)\n",ao_data.samplerate,rate);
 355   }
 356
 357   if(ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz)==-1){
 358       int r=0;
 359       mp_msg(MSGT_AO,MSGL_WARN,MSGTR_AO_OSS_CantUseGetospace);
 360       if(ioctl(audio_fd, SNDCTL_DSP_GETBLKSIZE, &r)==-1){
 361           mp_msg(MSGT_AO,MSGL_V,"audio_setup: %d bytes/frag (config.h)\n",ao_data.outburst);
 362       } else {
 363           ao_data.outburst=r;
 364           mp_msg(MSGT_AO,MSGL_V,"audio_setup: %d bytes/frag (GETBLKSIZE)\n",ao_data.outburst);
 365       }
 366   } else {
 367       mp_msg(MSGT_AO,MSGL_V,"audio_setup: frags: %3d/%d  (%d bytes/frag)  free: %6d\n",
 368           zz.fragments, zz.fragstotal, zz.fragsize, zz.bytes);
 369       if(ao_data.buffersize==-1) ao_data.buffersize=zz.bytes;
 370       ao_data.outburst=zz.fragsize;
 371   }
 372
 373   if(ao_data.buffersize==-1){
 374     // Measuring buffer size:
 375     void* data;
 376     ao_data.buffersize=0;
 377 #ifdef HAVE_AUDIO_SELECT
 378     data=malloc(ao_data.outburst); memset(data,0,ao_data.outburst);
 379     while(ao_data.buffersize<0x40000){
 380       fd_set rfds;
 381       struct timeval tv;
 382       FD_ZERO(&rfds); FD_SET(audio_fd,&rfds);
 383       tv.tv_sec=0; tv.tv_usec = 0;
 384       if(!select(audio_fd+1, NULL, &rfds, NULL, &tv)) break;
 385       write(audio_fd,data,ao_data.outburst);
 386       ao_data.buffersize+=ao_data.outburst;
 387     }
 388     free(data);
 389     if(ao_data.buffersize==0){
 390         mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantUseSelect);
 391         return 0;
 392     }
 393 #endif
 394   }
 395
 396   ao_data.bps=ao_data.channels;
 397   if(ao_data.format != AF_FORMAT_U8 && ao_data.format != AF_FORMAT_S8)
 398     ao_data.bps*=2;
 399
 400   ao_data.outburst-=ao_data.outburst % ao_data.bps; // round down
 401   ao_data.bps*=ao_data.samplerate;
 402
 403     return 1;
 404 }
 405
 406 // close audio device
 407 static void uninit(int immed){
 408     if(audio_fd == -1) return;
 409 #ifdef SNDCTL_DSP_SYNC
 410     // to get the buffer played
 411     if (!immed)
 412         ioctl(audio_fd, SNDCTL_DSP_SYNC, NULL);
 413 #endif
 414 #ifdef SNDCTL_DSP_RESET
 415     if (immed)
 416         ioctl(audio_fd, SNDCTL_DSP_RESET, NULL);
 417 #endif
 418     close(audio_fd);
 419     audio_fd = -1;
 420 }
 421
 422 // stop playing and empty buffers (for seeking/pause)
 423 static void reset(void){
 424   int oss_format;
 425     uninit(1);
 426     audio_fd=open(dsp, O_WRONLY);
 427     if(audio_fd < 0){
 428         mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantReopen, strerror(errno));
 429         return;
 430     }
 431
 432 #if defined(FD_CLOEXEC) && defined(F_SETFD)
 433   fcntl(audio_fd, F_SETFD, FD_CLOEXEC);
 434 #endif
 435
 436   oss_format = format2oss(ao_data.format);
 437   ioctl (audio_fd, SNDCTL_DSP_SETFMT, &oss_format);
 438   if(ao_data.format != AF_FORMAT_AC3) {
 439     if (ao_data.channels > 2)
 440       ioctl (audio_fd, SNDCTL_DSP_CHANNELS, &ao_data.channels);
 441     else {
 442       int c = ao_data.channels-1;
 443       ioctl (audio_fd, SNDCTL_DSP_STEREO, &c);
 444     }
 445     ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_data.samplerate);
 446   }
 447 }
 448
 449 // stop playing, keep buffers (for pause)
 450 static void audio_pause(void)
 451 {
 452     prepause_space = get_space();
 453     uninit(1);
 454 }
 455
 456 // resume playing, after audio_pause()
 457 static void audio_resume(void)
 458 {
 459     int fillcnt;
 460     reset();
 461     fillcnt = get_space() - prepause_space;
 462     if (fillcnt > 0) {
 463       void *silence = calloc(fillcnt, 1);
 464       play(silence, fillcnt, 0);
 465       free(silence);
 466     }
 467 }
 468
 469
 470 // return: how many bytes can be played without blocking
 471 static int get_space(void){
 472   int playsize=ao_data.outburst;
 473
 474 #ifdef SNDCTL_DSP_GETOSPACE
 475   if(ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz)!=-1){
 476       // calculate exact buffer space:
 477       playsize = zz.fragments*zz.fragsize;
 478       if (playsize > MAX_OUTBURST)
 479         playsize = (MAX_OUTBURST / zz.fragsize) * zz.fragsize;
 480       return playsize;
 481   }
 482 #endif
 483
 484     // check buffer
 485 #ifdef HAVE_AUDIO_SELECT
 486     {  fd_set rfds;
 487        struct timeval tv;
 488        FD_ZERO(&rfds);
 489        FD_SET(audio_fd, &rfds);
 490        tv.tv_sec = 0;
 491        tv.tv_usec = 0;
 492        if(!select(audio_fd+1, NULL, &rfds, NULL, &tv)) return 0; // not block!
 493     }
 494 #endif
 495
 496   return ao_data.outburst;
 497 }
 498
 499 // plays 'len' bytes of 'data'
 500 // it should round it down to outburst*n
 501 // return: number of bytes played
 502 static int play(void* data,int len,int flags){
 503     if(len==0)
 504         return len;
 505     if(len>ao_data.outburst || !(flags & AOPLAY_FINAL_CHUNK)) {
 506         len/=ao_data.outburst;
 507         len*=ao_data.outburst;
 508     }
 509     len=write(audio_fd,data,len);
 510     return len;
 511 }
 512
 513 static int audio_delay_method=2;
 514
 515 // return: delay in seconds between first and last sample in buffer
 516 static float get_delay(void){
 517   /* Calculate how many bytes/second is sent out */
 518   if(audio_delay_method==2){
 519 #ifdef SNDCTL_DSP_GETODELAY
 520       int r=0;
 521       if(ioctl(audio_fd, SNDCTL_DSP_GETODELAY, &r)!=-1)
 522          return ((float)r)/(float)ao_data.bps;
 523 #endif
 524       audio_delay_method=1; // fallback if not supported
 525   }
 526   if(audio_delay_method==1){
 527       // SNDCTL_DSP_GETOSPACE
 528       if(ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz)!=-1)
 529          return ((float)(ao_data.buffersize-zz.bytes))/(float)ao_data.bps;
 530       audio_delay_method=0; // fallback if not supported
 531   }
 532   return ((float)ao_data.buffersize)/(float)ao_data.bps;
 533 }