libao2/ao_oss.c

   1 /*
   2  * OSS audio output driver
   3  *
   4  * This file is part of MPlayer.
   5  *
   6  * MPlayer is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * MPlayer is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23
  24 #include <sys/ioctl.h>
  25 #include <unistd.h>
  26 #include <sys/time.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <fcntl.h>
  30 #include <errno.h>
  31 #include <string.h>
  32
  33 #include "config.h"
  34 #include "mp_msg.h"
  35 #include "mixer.h"
  36 #include "help_mp.h"
  37
  38 #ifdef HAVE_SYS_SOUNDCARD_H
  39 #include <sys/soundcard.h>
  40 #else
  41 #ifdef HAVE_SOUNDCARD_H
  42 #include <soundcard.h>
  43 #endif
  44 #endif
  45
  46 #include "libaf/af_format.h"
  47
  48 #include "audio_out.h"
  49 #include "audio_out_internal.h"
  50
  51 static const ao_info_t info =
  52 {
  53         "OSS/ioctl audio output",
  54         "oss",
  55         "A'rpi",
  56         ""
  57 };
  58
  59 /* Support for >2 output channels added 2001-11-25 - Steve Davies <steve@daviesfam.org> */
  60
  61 LIBAO_EXTERN(oss)
  62
  63 static int format2oss(int format)
  64 {
  65     switch(format)
  66     {
  67     case AF_FORMAT_U8: return AFMT_U8;
  68     case AF_FORMAT_S8: return AFMT_S8;
  69     case AF_FORMAT_U16_LE: return AFMT_U16_LE;
  70     case AF_FORMAT_U16_BE: return AFMT_U16_BE;
  71     case AF_FORMAT_S16_LE: return AFMT_S16_LE;
  72     case AF_FORMAT_S16_BE: return AFMT_S16_BE;
  73 #ifdef AFMT_S24_PACKED
  74     case AF_FORMAT_S24_LE: return AFMT_S24_PACKED;
  75 #endif
  76 #ifdef AFMT_U32_LE
  77     case AF_FORMAT_U32_LE: return AFMT_U32_LE;
  78 #endif
  79 #ifdef AFMT_U32_BE
  80     case AF_FORMAT_U32_BE: return AFMT_U32_BE;
  81 #endif
  82 #ifdef AFMT_S32_LE
  83     case AF_FORMAT_S32_LE: return AFMT_S32_LE;
  84 #endif
  85 #ifdef AFMT_S32_BE
  86     case AF_FORMAT_S32_BE: return AFMT_S32_BE;
  87 #endif
  88 #ifdef AFMT_FLOAT
  89     case AF_FORMAT_FLOAT_NE: return AFMT_FLOAT;
  90 #endif
  91     // SPECIALS
  92     case AF_FORMAT_MU_LAW: return AFMT_MU_LAW;
  93     case AF_FORMAT_A_LAW: return AFMT_A_LAW;
  94     case AF_FORMAT_IMA_ADPCM: return AFMT_IMA_ADPCM;
  95 #ifdef AFMT_MPEG
  96     case AF_FORMAT_MPEG2: return AFMT_MPEG;
  97 #endif
  98 #ifdef AFMT_AC3
  99     case AF_FORMAT_AC3: return AFMT_AC3;
 100 #endif
 101     }
 102     mp_msg(MSGT_AO, MSGL_V, "OSS: Unknown/not supported internal format: %s\n", af_fmt2str_short(format));
 103     return -1;
 104 }
 105
 106 static int oss2format(int format)
 107 {
 108     switch(format)
 109     {
 110     case AFMT_U8: return AF_FORMAT_U8;
 111     case AFMT_S8: return AF_FORMAT_S8;
 112     case AFMT_U16_LE: return AF_FORMAT_U16_LE;
 113     case AFMT_U16_BE: return AF_FORMAT_U16_BE;
 114     case AFMT_S16_LE: return AF_FORMAT_S16_LE;
 115     case AFMT_S16_BE: return AF_FORMAT_S16_BE;
 116 #ifdef AFMT_S24_PACKED
 117     case AFMT_S24_PACKED: return AF_FORMAT_S24_LE;
 118 #endif
 119 #ifdef AFMT_U32_LE
 120     case AFMT_U32_LE: return AF_FORMAT_U32_LE;
 121 #endif
 122 #ifdef AFMT_U32_BE
 123     case AFMT_U32_BE: return AF_FORMAT_U32_BE;
 124 #endif
 125 #ifdef AFMT_S32_LE
 126     case AFMT_S32_LE: return AF_FORMAT_S32_LE;
 127 #endif
 128 #ifdef AFMT_S32_BE
 129     case AFMT_S32_BE: return AF_FORMAT_S32_BE;
 130 #endif
 131 #ifdef AFMT_FLOAT
 132     case AFMT_FLOAT: return AF_FORMAT_FLOAT_NE;
 133 #endif
 134     // SPECIALS
 135     case AFMT_MU_LAW: return AF_FORMAT_MU_LAW;
 136     case AFMT_A_LAW: return AF_FORMAT_A_LAW;
 137     case AFMT_IMA_ADPCM: return AF_FORMAT_IMA_ADPCM;
 138 #ifdef AFMT_MPEG
 139     case AFMT_MPEG: return AF_FORMAT_MPEG2;
 140 #endif
 141 #ifdef AFMT_AC3
 142     case AFMT_AC3: return AF_FORMAT_AC3;
 143 #endif
 144     }
 145     mp_msg(MSGT_GLOBAL,MSGL_ERR,MSGTR_AO_OSS_UnknownUnsupportedFormat, format);
 146     return -1;
 147 }
 148
 149 static char *dsp=PATH_DEV_DSP;
 150 static audio_buf_info zz;
 151 static int audio_fd=-1;
 152 static int prepause_space;
 153
 154 static const char *oss_mixer_device = PATH_DEV_MIXER;
 155 static int oss_mixer_channel = SOUND_MIXER_PCM;
 156
 157 // to set/get/query special features/parameters
 158 static int control(int cmd,void *arg){
 159     switch(cmd){
 160         case AOCONTROL_SET_DEVICE:
 161             dsp=(char*)arg;
 162             return CONTROL_OK;
 163         case AOCONTROL_GET_DEVICE:
 164             *(char**)arg=dsp;
 165             return CONTROL_OK;
 166 #ifdef SNDCTL_DSP_GETFMTS
 167         case AOCONTROL_QUERY_FORMAT:
 168         {
 169             int format;
 170             if (!ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &format))
 171                 if ((unsigned int)format & (unsigned long)arg)
 172                     return CONTROL_TRUE;
 173             return CONTROL_FALSE;
 174         }
 175 #endif
 176         case AOCONTROL_GET_VOLUME:
 177         case AOCONTROL_SET_VOLUME:
 178         {
 179             ao_control_vol_t *vol = (ao_control_vol_t *)arg;
 180             int fd, v, devs;
 181
 182             if(ao_data.format == AF_FORMAT_AC3)
 183                 return CONTROL_TRUE;
 184
 185             if ((fd = open(oss_mixer_device, O_RDONLY)) > 0)
 186             {
 187                 ioctl(fd, SOUND_MIXER_READ_DEVMASK, &devs);
 188                 if (devs & (1 << oss_mixer_channel))
 189                 {
 190                     if (cmd == AOCONTROL_GET_VOLUME)
 191                     {
 192                         ioctl(fd, MIXER_READ(oss_mixer_channel), &v);
 193                         vol->right = (v & 0xFF00) >> 8;
 194                         vol->left = v & 0x00FF;
 195                     }
 196                     else
 197                     {
 198                         v = ((int)vol->right << 8) | (int)vol->left;
 199                         ioctl(fd, MIXER_WRITE(oss_mixer_channel), &v);
 200                     }
 201                 }
 202                 else
 203                 {
 204                     close(fd);
 205                     return CONTROL_ERROR;
 206                 }
 207                 close(fd);
 208                 return CONTROL_OK;
 209             }
 210         }
 211         return CONTROL_ERROR;
 212     }
 213     return CONTROL_UNKNOWN;
 214 }
 215
 216 // open & setup audio device
 217 // return: 1=success 0=fail
 218 static int init(int rate,int channels,int format,int flags){
 219   char *mixer_channels [SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES;
 220   int oss_format;
 221   char *mdev = mixer_device, *mchan = mixer_channel;
 222
 223   mp_msg(MSGT_AO,MSGL_V,"ao2: %d Hz  %d chans  %s\n",rate,channels,
 224     af_fmt2str_short(format));
 225
 226   if (ao_subdevice) {
 227     char *m,*c;
 228     m = strchr(ao_subdevice,':');
 229     if(m) {
 230       c = strchr(m+1,':');
 231       if(c) {
 232         mchan = c+1;
 233         c[0] = '\0';
 234       }
 235       mdev = m+1;
 236       m[0] = '\0';
 237     }
 238     dsp = ao_subdevice;
 239   }
 240
 241   if(mdev)
 242     oss_mixer_device=mdev;
 243   else
 244     oss_mixer_device=PATH_DEV_MIXER;
 245
 246   if(mchan){
 247     int fd, devs, i;
 248
 249     if ((fd = open(oss_mixer_device, O_RDONLY)) == -1){
 250       mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantOpenMixer,
 251         oss_mixer_device, strerror(errno));
 252     }else{
 253       ioctl(fd, SOUND_MIXER_READ_DEVMASK, &devs);
 254       close(fd);
 255
 256       for (i=0; i<SOUND_MIXER_NRDEVICES; i++){
 257         if(!strcasecmp(mixer_channels[i], mchan)){
 258           if(!(devs & (1 << i))){
 259             mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_ChanNotFound,mchan);
 260             i = SOUND_MIXER_NRDEVICES+1;
 261             break;
 262           }
 263           oss_mixer_channel = i;
 264           break;
 265         }
 266       }
 267       if(i==SOUND_MIXER_NRDEVICES){
 268         mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_ChanNotFound,mchan);
 269       }
 270     }
 271   } else
 272     oss_mixer_channel = SOUND_MIXER_PCM;
 273
 274   mp_msg(MSGT_AO,MSGL_V,"audio_setup: using '%s' dsp device\n", dsp);
 275   mp_msg(MSGT_AO,MSGL_V,"audio_setup: using '%s' mixer device\n", oss_mixer_device);
 276   mp_msg(MSGT_AO,MSGL_V,"audio_setup: using '%s' mixer device\n", mixer_channels[oss_mixer_channel]);
 277
 278 #ifdef __linux__
 279   audio_fd=open(dsp, O_WRONLY | O_NONBLOCK);
 280 #else
 281   audio_fd=open(dsp, O_WRONLY);
 282 #endif
 283   if(audio_fd<0){
 284     mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantOpenDev, dsp, strerror(errno));
 285     return 0;
 286   }
 287
 288 #ifdef __linux__
 289   /* Remove the non-blocking flag */
 290   if(fcntl(audio_fd, F_SETFL, 0) < 0) {
 291    mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantMakeFd, strerror(errno));
 292    return 0;
 293   }
 294 #endif
 295
 296 #if defined(FD_CLOEXEC) && defined(F_SETFD)
 297   fcntl(audio_fd, F_SETFD, FD_CLOEXEC);
 298 #endif
 299
 300   if(format == AF_FORMAT_AC3) {
 301     ao_data.samplerate=rate;
 302     ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_data.samplerate);
 303   }
 304
 305 ac3_retry:
 306   ao_data.format=format;
 307   oss_format=format2oss(format);
 308   if (oss_format == -1) {
 309 #if HAVE_BIGENDIAN
 310     oss_format=AFMT_S16_BE;
 311 #else
 312     oss_format=AFMT_S16_LE;
 313 #endif
 314     format=AF_FORMAT_S16_NE;
 315   }
 316   if( ioctl(audio_fd, SNDCTL_DSP_SETFMT, &oss_format)<0 ||
 317       oss_format != format2oss(format)) {
 318     mp_msg(MSGT_AO,MSGL_WARN, MSGTR_AO_OSS_CantSet, dsp,
 319             af_fmt2str_short(format), af_fmt2str_short(AF_FORMAT_S16_NE) );
 320     format=AF_FORMAT_S16_NE;
 321     goto ac3_retry;
 322   }
 323 #if 0
 324   if(oss_format!=format2oss(format))
 325         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));
 326 #endif
 327
 328   ao_data.format = oss2format(oss_format);
 329   if (ao_data.format == -1) return 0;
 330
 331   mp_msg(MSGT_AO,MSGL_V,"audio_setup: sample format: %s (requested: %s)\n",
 332     af_fmt2str_short(ao_data.format), af_fmt2str_short(format));
 333
 334   ao_data.channels = channels;
 335   if(format != AF_FORMAT_AC3) {
 336     // We only use SNDCTL_DSP_CHANNELS for >2 channels, in case some drivers don't have it
 337     if (ao_data.channels > 2) {
 338       if ( ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &ao_data.channels) == -1 ||
 339            ao_data.channels != channels ) {
 340         mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantSetChans, channels);
 341         return 0;
 342       }
 343     }
 344     else {
 345       int c = ao_data.channels-1;
 346       if (ioctl (audio_fd, SNDCTL_DSP_STEREO, &c) == -1) {
 347         mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantSetChans, ao_data.channels);
 348         return 0;
 349       }
 350       ao_data.channels=c+1;
 351     }
 352     mp_msg(MSGT_AO,MSGL_V,"audio_setup: using %d channels (requested: %d)\n", ao_data.channels, channels);
 353     // set rate
 354     ao_data.samplerate=rate;
 355     ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_data.samplerate);
 356     mp_msg(MSGT_AO,MSGL_V,"audio_setup: using %d Hz samplerate (requested: %d)\n",ao_data.samplerate,rate);
 357   }
 358
 359   if(ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz)==-1){
 360       int r=0;
 361       mp_msg(MSGT_AO,MSGL_WARN,MSGTR_AO_OSS_CantUseGetospace);
 362       if(ioctl(audio_fd, SNDCTL_DSP_GETBLKSIZE, &r)==-1){
 363           mp_msg(MSGT_AO,MSGL_V,"audio_setup: %d bytes/frag (config.h)\n",ao_data.outburst);
 364       } else {
 365           ao_data.outburst=r;
 366           mp_msg(MSGT_AO,MSGL_V,"audio_setup: %d bytes/frag (GETBLKSIZE)\n",ao_data.outburst);
 367       }
 368   } else {
 369       mp_msg(MSGT_AO,MSGL_V,"audio_setup: frags: %3d/%d  (%d bytes/frag)  free: %6d\n",
 370           zz.fragments, zz.fragstotal, zz.fragsize, zz.bytes);
 371       if(ao_data.buffersize==-1) ao_data.buffersize=zz.bytes;
 372       ao_data.outburst=zz.fragsize;
 373   }
 374
 375   if(ao_data.buffersize==-1){
 376     // Measuring buffer size:
 377     void* data;
 378     ao_data.buffersize=0;
 379 #ifdef HAVE_AUDIO_SELECT
 380     data=malloc(ao_data.outburst); memset(data,0,ao_data.outburst);
 381     while(ao_data.buffersize<0x40000){
 382       fd_set rfds;
 383       struct timeval tv;
 384       FD_ZERO(&rfds); FD_SET(audio_fd,&rfds);
 385       tv.tv_sec=0; tv.tv_usec = 0;
 386       if(!select(audio_fd+1, NULL, &rfds, NULL, &tv)) break;
 387       write(audio_fd,data,ao_data.outburst);
 388       ao_data.buffersize+=ao_data.outburst;
 389     }
 390     free(data);
 391     if(ao_data.buffersize==0){
 392         mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantUseSelect);
 393         return 0;
 394     }
 395 #endif
 396   }
 397
 398   ao_data.bps=ao_data.channels;
 399   switch (ao_data.format & AF_FORMAT_BITS_MASK) {
 400   case AF_FORMAT_8BIT:
 401     break;
 402   case AF_FORMAT_16BIT:
 403     ao_data.bps*=2;
 404     break;
 405   case AF_FORMAT_24BIT:
 406     ao_data.bps*=3;
 407     break;
 408   case AF_FORMAT_32BIT:
 409     ao_data.bps*=4;
 410     break;
 411   }
 412
 413   ao_data.outburst-=ao_data.outburst % ao_data.bps; // round down
 414   ao_data.bps*=ao_data.samplerate;
 415
 416     return 1;
 417 }
 418
 419 // close audio device
 420 static void uninit(int immed){
 421     if(audio_fd == -1) return;
 422 #ifdef SNDCTL_DSP_SYNC
 423     // to get the buffer played
 424     if (!immed)
 425         ioctl(audio_fd, SNDCTL_DSP_SYNC, NULL);
 426 #endif
 427 #ifdef SNDCTL_DSP_RESET
 428     if (immed)
 429         ioctl(audio_fd, SNDCTL_DSP_RESET, NULL);
 430 #endif
 431     close(audio_fd);
 432     audio_fd = -1;
 433 }
 434
 435 // stop playing and empty buffers (for seeking/pause)
 436 static void reset(void){
 437   int oss_format;
 438     uninit(1);
 439     audio_fd=open(dsp, O_WRONLY);
 440     if(audio_fd < 0){
 441         mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantReopen, strerror(errno));
 442         return;
 443     }
 444
 445 #if defined(FD_CLOEXEC) && defined(F_SETFD)
 446   fcntl(audio_fd, F_SETFD, FD_CLOEXEC);
 447 #endif
 448
 449   oss_format = format2oss(ao_data.format);
 450   if(ao_data.format == AF_FORMAT_AC3)
 451     ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_data.samplerate);
 452   ioctl (audio_fd, SNDCTL_DSP_SETFMT, &oss_format);
 453   if(ao_data.format != AF_FORMAT_AC3) {
 454     if (ao_data.channels > 2)
 455       ioctl (audio_fd, SNDCTL_DSP_CHANNELS, &ao_data.channels);
 456     else {
 457       int c = ao_data.channels-1;
 458       ioctl (audio_fd, SNDCTL_DSP_STEREO, &c);
 459     }
 460     ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_data.samplerate);
 461   }
 462 }
 463
 464 // stop playing, keep buffers (for pause)
 465 static void audio_pause(void)
 466 {
 467     prepause_space = get_space();
 468     uninit(1);
 469 }
 470
 471 // resume playing, after audio_pause()
 472 static void audio_resume(void)
 473 {
 474     int fillcnt;
 475     reset();
 476     fillcnt = get_space() - prepause_space;
 477     if (fillcnt > 0 && !(ao_data.format & AF_FORMAT_SPECIAL_MASK)) {
 478       void *silence = calloc(fillcnt, 1);
 479       play(silence, fillcnt, 0);
 480       free(silence);
 481     }
 482 }
 483
 484
 485 // return: how many bytes can be played without blocking
 486 static int get_space(void){
 487   int playsize=ao_data.outburst;
 488
 489 #ifdef SNDCTL_DSP_GETOSPACE
 490   if(ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz)!=-1){
 491       // calculate exact buffer space:
 492       playsize = zz.fragments*zz.fragsize;
 493       if (playsize > MAX_OUTBURST)
 494         playsize = (MAX_OUTBURST / zz.fragsize) * zz.fragsize;
 495       return playsize;
 496   }
 497 #endif
 498
 499     // check buffer
 500 #ifdef HAVE_AUDIO_SELECT
 501     {  fd_set rfds;
 502        struct timeval tv;
 503        FD_ZERO(&rfds);
 504        FD_SET(audio_fd, &rfds);
 505        tv.tv_sec = 0;
 506        tv.tv_usec = 0;
 507        if(!select(audio_fd+1, NULL, &rfds, NULL, &tv)) return 0; // not block!
 508     }
 509 #endif
 510
 511   return ao_data.outburst;
 512 }
 513
 514 // plays 'len' bytes of 'data'
 515 // it should round it down to outburst*n
 516 // return: number of bytes played
 517 static int play(void* data,int len,int flags){
 518     if(len==0)
 519         return len;
 520     if(len>ao_data.outburst || !(flags & AOPLAY_FINAL_CHUNK)) {
 521         len/=ao_data.outburst;
 522         len*=ao_data.outburst;
 523     }
 524     len=write(audio_fd,data,len);
 525     return len;
 526 }
 527
 528 static int audio_delay_method=2;
 529
 530 // return: delay in seconds between first and last sample in buffer
 531 static float get_delay(void){
 532   /* Calculate how many bytes/second is sent out */
 533   if(audio_delay_method==2){
 534 #ifdef SNDCTL_DSP_GETODELAY
 535       int r=0;
 536       if(ioctl(audio_fd, SNDCTL_DSP_GETODELAY, &r)!=-1)
 537          return ((float)r)/(float)ao_data.bps;
 538 #endif
 539       audio_delay_method=1; // fallback if not supported
 540   }
 541   if(audio_delay_method==1){
 542       // SNDCTL_DSP_GETOSPACE
 543       if(ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz)!=-1)
 544          return ((float)(ao_data.buffersize-zz.bytes))/(float)ao_data.bps;
 545       audio_delay_method=0; // fallback if not supported
 546   }
 547   return ((float)ao_data.buffersize)/(float)ao_data.bps;
 548 }