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_U24_LE
  74     case AF_FORMAT_U24_LE: return AFMT_U24_LE;
  75 #endif
  76 #ifdef AFMT_U24_BE
  77     case AF_FORMAT_U24_BE: return AFMT_U24_BE;
  78 #endif
  79 #ifdef AFMT_S24_LE
  80     case AF_FORMAT_S24_LE: return AFMT_S24_LE;
  81 #endif
  82 #ifdef AFMT_S24_BE
  83     case AF_FORMAT_S24_BE: return AFMT_S24_BE;
  84 #endif
  85 #ifdef AFMT_U32_LE
  86     case AF_FORMAT_U32_LE: return AFMT_U32_LE;
  87 #endif
  88 #ifdef AFMT_U32_BE
  89     case AF_FORMAT_U32_BE: return AFMT_U32_BE;
  90 #endif
  91 #ifdef AFMT_S32_LE
  92     case AF_FORMAT_S32_LE: return AFMT_S32_LE;
  93 #endif
  94 #ifdef AFMT_S32_BE
  95     case AF_FORMAT_S32_BE: return AFMT_S32_BE;
  96 #endif
  97 #ifdef AFMT_FLOAT
  98     case AF_FORMAT_FLOAT_NE: return AFMT_FLOAT;
  99 #endif
 100     // SPECIALS
 101     case AF_FORMAT_MU_LAW: return AFMT_MU_LAW;
 102     case AF_FORMAT_A_LAW: return AFMT_A_LAW;
 103     case AF_FORMAT_IMA_ADPCM: return AFMT_IMA_ADPCM;
 104 #ifdef AFMT_MPEG
 105     case AF_FORMAT_MPEG2: return AFMT_MPEG;
 106 #endif
 107 #ifdef AFMT_AC3
 108     case AF_FORMAT_AC3: return AFMT_AC3;
 109 #endif
 110     }
 111     mp_msg(MSGT_AO, MSGL_V, "OSS: Unknown/not supported internal format: %s\n", af_fmt2str_short(format));
 112     return -1;
 113 }
 114
 115 static int oss2format(int format)
 116 {
 117     switch(format)
 118     {
 119     case AFMT_U8: return AF_FORMAT_U8;
 120     case AFMT_S8: return AF_FORMAT_S8;
 121     case AFMT_U16_LE: return AF_FORMAT_U16_LE;
 122     case AFMT_U16_BE: return AF_FORMAT_U16_BE;
 123     case AFMT_S16_LE: return AF_FORMAT_S16_LE;
 124     case AFMT_S16_BE: return AF_FORMAT_S16_BE;
 125 #ifdef AFMT_U24_LE
 126     case AFMT_U24_LE: return AF_FORMAT_U24_LE;
 127 #endif
 128 #ifdef AFMT_U24_BE
 129     case AFMT_U24_BE: return AF_FORMAT_U24_BE;
 130 #endif
 131 #ifdef AFMT_S24_LE
 132     case AFMT_S24_LE: return AF_FORMAT_S24_LE;
 133 #endif
 134 #ifdef AFMT_S24_BE
 135     case AFMT_S24_BE: return AF_FORMAT_S24_BE;
 136 #endif
 137 #ifdef AFMT_U32_LE
 138     case AFMT_U32_LE: return AF_FORMAT_U32_LE;
 139 #endif
 140 #ifdef AFMT_U32_BE
 141     case AFMT_U32_BE: return AF_FORMAT_U32_BE;
 142 #endif
 143 #ifdef AFMT_S32_LE
 144     case AFMT_S32_LE: return AF_FORMAT_S32_LE;
 145 #endif
 146 #ifdef AFMT_S32_BE
 147     case AFMT_S32_BE: return AF_FORMAT_S32_BE;
 148 #endif
 149 #ifdef AFMT_FLOAT
 150     case AFMT_FLOAT: return AF_FORMAT_FLOAT_NE;
 151 #endif
 152     // SPECIALS
 153     case AFMT_MU_LAW: return AF_FORMAT_MU_LAW;
 154     case AFMT_A_LAW: return AF_FORMAT_A_LAW;
 155     case AFMT_IMA_ADPCM: return AF_FORMAT_IMA_ADPCM;
 156 #ifdef AFMT_MPEG
 157     case AFMT_MPEG: return AF_FORMAT_MPEG2;
 158 #endif
 159 #ifdef AFMT_AC3
 160     case AFMT_AC3: return AF_FORMAT_AC3;
 161 #endif
 162     }
 163     mp_msg(MSGT_GLOBAL,MSGL_ERR,MSGTR_AO_OSS_UnknownUnsupportedFormat, format);
 164     return -1;
 165 }
 166
 167 static char *dsp=PATH_DEV_DSP;
 168 static audio_buf_info zz;
 169 static int audio_fd=-1;
 170 static int prepause_space;
 171
 172 static const char *oss_mixer_device = PATH_DEV_MIXER;
 173 static int oss_mixer_channel = SOUND_MIXER_PCM;
 174
 175 // to set/get/query special features/parameters
 176 static int control(int cmd,void *arg){
 177     switch(cmd){
 178         case AOCONTROL_SET_DEVICE:
 179             dsp=(char*)arg;
 180             return CONTROL_OK;
 181         case AOCONTROL_GET_DEVICE:
 182             *(char**)arg=dsp;
 183             return CONTROL_OK;
 184 #ifdef SNDCTL_DSP_GETFMTS
 185         case AOCONTROL_QUERY_FORMAT:
 186         {
 187             int format;
 188             if (!ioctl(audio_fd, SNDCTL_DSP_GETFMTS, &format))
 189                 if ((unsigned int)format & (unsigned long)arg)
 190                     return CONTROL_TRUE;
 191             return CONTROL_FALSE;
 192         }
 193 #endif
 194         case AOCONTROL_GET_VOLUME:
 195         case AOCONTROL_SET_VOLUME:
 196         {
 197             ao_control_vol_t *vol = (ao_control_vol_t *)arg;
 198             int fd, v, devs;
 199
 200             if(ao_data.format == AF_FORMAT_AC3)
 201                 return CONTROL_TRUE;
 202
 203             if ((fd = open(oss_mixer_device, O_RDONLY)) > 0)
 204             {
 205                 ioctl(fd, SOUND_MIXER_READ_DEVMASK, &devs);
 206                 if (devs & (1 << oss_mixer_channel))
 207                 {
 208                     if (cmd == AOCONTROL_GET_VOLUME)
 209                     {
 210                         ioctl(fd, MIXER_READ(oss_mixer_channel), &v);
 211                         vol->right = (v & 0xFF00) >> 8;
 212                         vol->left = v & 0x00FF;
 213                     }
 214                     else
 215                     {
 216                         v = ((int)vol->right << 8) | (int)vol->left;
 217                         ioctl(fd, MIXER_WRITE(oss_mixer_channel), &v);
 218                     }
 219                 }
 220                 else
 221                 {
 222                     close(fd);
 223                     return CONTROL_ERROR;
 224                 }
 225                 close(fd);
 226                 return CONTROL_OK;
 227             }
 228         }
 229         return CONTROL_ERROR;
 230     }
 231     return CONTROL_UNKNOWN;
 232 }
 233
 234 // open & setup audio device
 235 // return: 1=success 0=fail
 236 static int init(int rate,int channels,int format,int flags){
 237   char *mixer_channels [SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES;
 238   int oss_format;
 239   char *mdev = mixer_device, *mchan = mixer_channel;
 240
 241   mp_msg(MSGT_AO,MSGL_V,"ao2: %d Hz  %d chans  %s\n",rate,channels,
 242     af_fmt2str_short(format));
 243
 244   if (ao_subdevice) {
 245     char *m,*c;
 246     m = strchr(ao_subdevice,':');
 247     if(m) {
 248       c = strchr(m+1,':');
 249       if(c) {
 250         mchan = c+1;
 251         c[0] = '\0';
 252       }
 253       mdev = m+1;
 254       m[0] = '\0';
 255     }
 256     dsp = ao_subdevice;
 257   }
 258
 259   if(mdev)
 260     oss_mixer_device=mdev;
 261   else
 262     oss_mixer_device=PATH_DEV_MIXER;
 263
 264   if(mchan){
 265     int fd, devs, i;
 266
 267     if ((fd = open(oss_mixer_device, O_RDONLY)) == -1){
 268       mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantOpenMixer,
 269         oss_mixer_device, strerror(errno));
 270     }else{
 271       ioctl(fd, SOUND_MIXER_READ_DEVMASK, &devs);
 272       close(fd);
 273
 274       for (i=0; i<SOUND_MIXER_NRDEVICES; i++){
 275         if(!strcasecmp(mixer_channels[i], mchan)){
 276           if(!(devs & (1 << i))){
 277             mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_ChanNotFound,mchan);
 278             i = SOUND_MIXER_NRDEVICES+1;
 279             break;
 280           }
 281           oss_mixer_channel = i;
 282           break;
 283         }
 284       }
 285       if(i==SOUND_MIXER_NRDEVICES){
 286         mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_ChanNotFound,mchan);
 287       }
 288     }
 289   } else
 290     oss_mixer_channel = SOUND_MIXER_PCM;
 291
 292   mp_msg(MSGT_AO,MSGL_V,"audio_setup: using '%s' dsp device\n", dsp);
 293   mp_msg(MSGT_AO,MSGL_V,"audio_setup: using '%s' mixer device\n", oss_mixer_device);
 294   mp_msg(MSGT_AO,MSGL_V,"audio_setup: using '%s' mixer device\n", mixer_channels[oss_mixer_channel]);
 295
 296 #ifdef __linux__
 297   audio_fd=open(dsp, O_WRONLY | O_NONBLOCK);
 298 #else
 299   audio_fd=open(dsp, O_WRONLY);
 300 #endif
 301   if(audio_fd<0){
 302     mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantOpenDev, dsp, strerror(errno));
 303     return 0;
 304   }
 305
 306 #ifdef __linux__
 307   /* Remove the non-blocking flag */
 308   if(fcntl(audio_fd, F_SETFL, 0) < 0) {
 309    mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantMakeFd, strerror(errno));
 310    return 0;
 311   }
 312 #endif
 313
 314 #if defined(FD_CLOEXEC) && defined(F_SETFD)
 315   fcntl(audio_fd, F_SETFD, FD_CLOEXEC);
 316 #endif
 317
 318   if(format == AF_FORMAT_AC3) {
 319     ao_data.samplerate=rate;
 320     ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_data.samplerate);
 321   }
 322
 323 ac3_retry:
 324   ao_data.format=format;
 325   oss_format=format2oss(format);
 326   if (oss_format == -1) {
 327 #ifdef WORDS_BIGENDIAN
 328     oss_format=AFMT_S16_BE;
 329 #else
 330     oss_format=AFMT_S16_LE;
 331 #endif
 332     format=AF_FORMAT_S16_NE;
 333   }
 334   if( ioctl(audio_fd, SNDCTL_DSP_SETFMT, &oss_format)<0 ||
 335       oss_format != format2oss(format)) {
 336     mp_msg(MSGT_AO,MSGL_WARN, MSGTR_AO_OSS_CantSet, dsp,
 337             af_fmt2str_short(format), af_fmt2str_short(AF_FORMAT_S16_NE) );
 338     format=AF_FORMAT_S16_NE;
 339     goto ac3_retry;
 340   }
 341 #if 0
 342   if(oss_format!=format2oss(format))
 343         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));
 344 #endif
 345
 346   ao_data.format = oss2format(oss_format);
 347   if (ao_data.format == -1) return 0;
 348
 349   mp_msg(MSGT_AO,MSGL_V,"audio_setup: sample format: %s (requested: %s)\n",
 350     af_fmt2str_short(ao_data.format), af_fmt2str_short(format));
 351
 352   ao_data.channels = channels;
 353   if(format != AF_FORMAT_AC3) {
 354     // We only use SNDCTL_DSP_CHANNELS for >2 channels, in case some drivers don't have it
 355     if (ao_data.channels > 2) {
 356       if ( ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &ao_data.channels) == -1 ||
 357            ao_data.channels != channels ) {
 358         mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantSetChans, channels);
 359         return 0;
 360       }
 361     }
 362     else {
 363       int c = ao_data.channels-1;
 364       if (ioctl (audio_fd, SNDCTL_DSP_STEREO, &c) == -1) {
 365         mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantSetChans, ao_data.channels);
 366         return 0;
 367       }
 368       ao_data.channels=c+1;
 369     }
 370     mp_msg(MSGT_AO,MSGL_V,"audio_setup: using %d channels (requested: %d)\n", ao_data.channels, channels);
 371     // set rate
 372     ao_data.samplerate=rate;
 373     ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_data.samplerate);
 374     mp_msg(MSGT_AO,MSGL_V,"audio_setup: using %d Hz samplerate (requested: %d)\n",ao_data.samplerate,rate);
 375   }
 376
 377   if(ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz)==-1){
 378       int r=0;
 379       mp_msg(MSGT_AO,MSGL_WARN,MSGTR_AO_OSS_CantUseGetospace);
 380       if(ioctl(audio_fd, SNDCTL_DSP_GETBLKSIZE, &r)==-1){
 381           mp_msg(MSGT_AO,MSGL_V,"audio_setup: %d bytes/frag (config.h)\n",ao_data.outburst);
 382       } else {
 383           ao_data.outburst=r;
 384           mp_msg(MSGT_AO,MSGL_V,"audio_setup: %d bytes/frag (GETBLKSIZE)\n",ao_data.outburst);
 385       }
 386   } else {
 387       mp_msg(MSGT_AO,MSGL_V,"audio_setup: frags: %3d/%d  (%d bytes/frag)  free: %6d\n",
 388           zz.fragments, zz.fragstotal, zz.fragsize, zz.bytes);
 389       if(ao_data.buffersize==-1) ao_data.buffersize=zz.bytes;
 390       ao_data.outburst=zz.fragsize;
 391   }
 392
 393   if(ao_data.buffersize==-1){
 394     // Measuring buffer size:
 395     void* data;
 396     ao_data.buffersize=0;
 397 #ifdef HAVE_AUDIO_SELECT
 398     data=malloc(ao_data.outburst); memset(data,0,ao_data.outburst);
 399     while(ao_data.buffersize<0x40000){
 400       fd_set rfds;
 401       struct timeval tv;
 402       FD_ZERO(&rfds); FD_SET(audio_fd,&rfds);
 403       tv.tv_sec=0; tv.tv_usec = 0;
 404       if(!select(audio_fd+1, NULL, &rfds, NULL, &tv)) break;
 405       write(audio_fd,data,ao_data.outburst);
 406       ao_data.buffersize+=ao_data.outburst;
 407     }
 408     free(data);
 409     if(ao_data.buffersize==0){
 410         mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantUseSelect);
 411         return 0;
 412     }
 413 #endif
 414   }
 415
 416   ao_data.bps=ao_data.channels;
 417   if(ao_data.format != AF_FORMAT_U8 && ao_data.format != AF_FORMAT_S8)
 418     ao_data.bps*=2;
 419
 420   ao_data.outburst-=ao_data.outburst % ao_data.bps; // round down
 421   ao_data.bps*=ao_data.samplerate;
 422
 423     return 1;
 424 }
 425
 426 // close audio device
 427 static void uninit(int immed){
 428     if(audio_fd == -1) return;
 429 #ifdef SNDCTL_DSP_SYNC
 430     // to get the buffer played
 431     if (!immed)
 432         ioctl(audio_fd, SNDCTL_DSP_SYNC, NULL);
 433 #endif
 434 #ifdef SNDCTL_DSP_RESET
 435     if (immed)
 436         ioctl(audio_fd, SNDCTL_DSP_RESET, NULL);
 437 #endif
 438     close(audio_fd);
 439     audio_fd = -1;
 440 }
 441
 442 // stop playing and empty buffers (for seeking/pause)
 443 static void reset(void){
 444   int oss_format;
 445     uninit(1);
 446     audio_fd=open(dsp, O_WRONLY);
 447     if(audio_fd < 0){
 448         mp_msg(MSGT_AO,MSGL_ERR,MSGTR_AO_OSS_CantReopen, strerror(errno));
 449         return;
 450     }
 451
 452 #if defined(FD_CLOEXEC) && defined(F_SETFD)
 453   fcntl(audio_fd, F_SETFD, FD_CLOEXEC);
 454 #endif
 455
 456   oss_format = format2oss(ao_data.format);
 457   if(ao_data.format == AF_FORMAT_AC3)
 458     ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_data.samplerate);
 459   ioctl (audio_fd, SNDCTL_DSP_SETFMT, &oss_format);
 460   if(ao_data.format != AF_FORMAT_AC3) {
 461     if (ao_data.channels > 2)
 462       ioctl (audio_fd, SNDCTL_DSP_CHANNELS, &ao_data.channels);
 463     else {
 464       int c = ao_data.channels-1;
 465       ioctl (audio_fd, SNDCTL_DSP_STEREO, &c);
 466     }
 467     ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_data.samplerate);
 468   }
 469 }
 470
 471 // stop playing, keep buffers (for pause)
 472 static void audio_pause(void)
 473 {
 474     prepause_space = get_space();
 475     uninit(1);
 476 }
 477
 478 // resume playing, after audio_pause()
 479 static void audio_resume(void)
 480 {
 481     int fillcnt;
 482     reset();
 483     fillcnt = get_space() - prepause_space;
 484     if (fillcnt > 0 && !(ao_data.format & AF_FORMAT_SPECIAL_MASK)) {
 485       void *silence = calloc(fillcnt, 1);
 486       play(silence, fillcnt, 0);
 487       free(silence);
 488     }
 489 }
 490
 491
 492 // return: how many bytes can be played without blocking
 493 static int get_space(void){
 494   int playsize=ao_data.outburst;
 495
 496 #ifdef SNDCTL_DSP_GETOSPACE
 497   if(ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz)!=-1){
 498       // calculate exact buffer space:
 499       playsize = zz.fragments*zz.fragsize;
 500       if (playsize > MAX_OUTBURST)
 501         playsize = (MAX_OUTBURST / zz.fragsize) * zz.fragsize;
 502       return playsize;
 503   }
 504 #endif
 505
 506     // check buffer
 507 #ifdef HAVE_AUDIO_SELECT
 508     {  fd_set rfds;
 509        struct timeval tv;
 510        FD_ZERO(&rfds);
 511        FD_SET(audio_fd, &rfds);
 512        tv.tv_sec = 0;
 513        tv.tv_usec = 0;
 514        if(!select(audio_fd+1, NULL, &rfds, NULL, &tv)) return 0; // not block!
 515     }
 516 #endif
 517
 518   return ao_data.outburst;
 519 }
 520
 521 // plays 'len' bytes of 'data'
 522 // it should round it down to outburst*n
 523 // return: number of bytes played
 524 static int play(void* data,int len,int flags){
 525     if(len==0)
 526         return len;
 527     if(len>ao_data.outburst || !(flags & AOPLAY_FINAL_CHUNK)) {
 528         len/=ao_data.outburst;
 529         len*=ao_data.outburst;
 530     }
 531     len=write(audio_fd,data,len);
 532     return len;
 533 }
 534
 535 static int audio_delay_method=2;
 536
 537 // return: delay in seconds between first and last sample in buffer
 538 static float get_delay(void){
 539   /* Calculate how many bytes/second is sent out */
 540   if(audio_delay_method==2){
 541 #ifdef SNDCTL_DSP_GETODELAY
 542       int r=0;
 543       if(ioctl(audio_fd, SNDCTL_DSP_GETODELAY, &r)!=-1)
 544          return ((float)r)/(float)ao_data.bps;
 545 #endif
 546       audio_delay_method=1; // fallback if not supported
 547   }
 548   if(audio_delay_method==1){
 549       // SNDCTL_DSP_GETOSPACE
 550       if(ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz)!=-1)
 551          return ((float)(ao_data.buffersize-zz.bytes))/(float)ao_data.bps;
 552       audio_delay_method=0; // fallback if not supported
 553   }
 554   return ((float)ao_data.buffersize)/(float)ao_data.bps;
 555 }