libao2/ao_sgi.c

   1 /*
   2  * SGI/IRIX audio output driver
   3  *
   4  * copyright (c) 2001 oliver.schoenbrunner@jku.at
   5  *
   6  * This file is part of MPlayer.
   7  *
   8  * MPlayer is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * MPlayer is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 #include <errno.h>
  27 #include <dmedia/audio.h>
  28
  29 #include "audio_out.h"
  30 #include "audio_out_internal.h"
  31 #include "mp_msg.h"
  32 #include "help_mp.h"
  33 #include "libaf/af_format.h"
  34
  35 static const ao_info_t info =
  36 {
  37         "sgi audio output",
  38         "sgi",
  39         "Oliver Schoenbrunner",
  40         ""
  41 };
  42
  43 LIBAO_EXTERN(sgi)
  44
  45
  46 static ALconfig ao_config;
  47 static ALport   ao_port;
  48 static int sample_rate;
  49 static int queue_size;
  50 static int bytes_per_frame;
  51
  52 /**
  53  * \param   [in/out]  format
  54  * \param   [out]     width
  55  *
  56  * \return  the closest matching SGI AL sample format
  57  *
  58  * \note    width is set to required per-channel sample width
  59  *          format is updated to match the SGI AL sample format
  60  */
  61 static int fmt2sgial(int *format, int *width) {
  62   int smpfmt = AL_SAMPFMT_TWOSCOMP;
  63
  64   /* SGI AL only supports float and signed integers in native
  65    * endianness. If this is something else, we must rely on the audio
  66    * filter to convert it to a compatible format. */
  67
  68   /* 24-bit audio is supported, but only with 32-bit alignment.
  69    * mplayer's 24-bit format is packed, unfortunately.
  70    * So we must upgrade 24-bit requests to 32 bits. Then we drop the
  71    * lowest 8 bits during playback. */
  72
  73   switch(*format) {
  74   case AF_FORMAT_U8:
  75   case AF_FORMAT_S8:
  76     *width = AL_SAMPLE_8;
  77     *format = AF_FORMAT_S8;
  78     break;
  79
  80   case AF_FORMAT_U16_LE:
  81   case AF_FORMAT_U16_BE:
  82   case AF_FORMAT_S16_LE:
  83   case AF_FORMAT_S16_BE:
  84     *width = AL_SAMPLE_16;
  85     *format = AF_FORMAT_S16_NE;
  86     break;
  87
  88   case AF_FORMAT_U24_LE:
  89   case AF_FORMAT_U24_BE:
  90   case AF_FORMAT_S24_LE:
  91   case AF_FORMAT_S24_BE:
  92   case AF_FORMAT_U32_LE:
  93   case AF_FORMAT_U32_BE:
  94   case AF_FORMAT_S32_LE:
  95   case AF_FORMAT_S32_BE:
  96     *width = AL_SAMPLE_24;
  97     *format = AF_FORMAT_S32_NE;
  98     break;
  99
 100   case AF_FORMAT_FLOAT_LE:
 101   case AF_FORMAT_FLOAT_BE:
 102     *width = 4;
 103     *format = AF_FORMAT_FLOAT_NE;
 104     smpfmt = AL_SAMPFMT_FLOAT;
 105     break;
 106
 107   default:
 108     *width = AL_SAMPLE_16;
 109     *format = AF_FORMAT_S16_NE;
 110     break;
 111
 112   }
 113
 114   return smpfmt;
 115 }
 116
 117 // to set/get/query special features/parameters
 118 static int control(int cmd, void *arg){
 119
 120   mp_tmsg(MSGT_AO, MSGL_INFO, "[AO SGI] control.\n");
 121
 122   switch(cmd) {
 123   case AOCONTROL_QUERY_FORMAT:
 124     /* Do not reject any format: return the closest matching
 125      * format if the request is not supported natively. */
 126     return CONTROL_TRUE;
 127   }
 128
 129   return CONTROL_UNKNOWN;
 130 }
 131
 132 // open & setup audio device
 133 // return: 1=success 0=fail
 134 static int init(int rate, int channels, int format, int flags) {
 135
 136   int smpwidth, smpfmt;
 137   int rv = AL_DEFAULT_OUTPUT;
 138
 139   smpfmt = fmt2sgial(&format, &smpwidth);
 140
 141   mp_tmsg(MSGT_AO, MSGL_INFO, "[AO SGI] init: Samplerate: %iHz Channels: %s Format %s\n", rate, (channels > 1) ? "Stereo" : "Mono", af_fmt2str_short(format));
 142
 143   { /* from /usr/share/src/dmedia/audio/setrate.c */
 144
 145     double frate, realrate;
 146     ALpv x[2];
 147
 148     if(ao_subdevice) {
 149       rv = alGetResourceByName(AL_SYSTEM, ao_subdevice, AL_OUTPUT_DEVICE_TYPE);
 150       if (!rv) {
 151         mp_tmsg(MSGT_AO, MSGL_ERR, "[AO SGI] play: invalid device.\n");
 152         return 0;
 153       }
 154     }
 155
 156     frate = rate;
 157
 158     x[0].param = AL_RATE;
 159     x[0].value.ll = alDoubleToFixed(rate);
 160     x[1].param = AL_MASTER_CLOCK;
 161     x[1].value.i = AL_CRYSTAL_MCLK_TYPE;
 162
 163     if (alSetParams(rv,x, 2)<0) {
 164       mp_tmsg(MSGT_AO, MSGL_WARN, "[AO SGI] init: setparams failed: %s\nCould not set desired samplerate.\n", alGetErrorString(oserror()));
 165     }
 166
 167     if (x[0].sizeOut < 0) {
 168       mp_tmsg(MSGT_AO, MSGL_WARN, "[AO SGI] init: AL_RATE was not accepted on the given resource.\n");
 169     }
 170
 171     if (alGetParams(rv,x, 1)<0) {
 172       mp_tmsg(MSGT_AO, MSGL_WARN, "[AO SGI] init: getparams failed: %s\n", alGetErrorString(oserror()));
 173     }
 174
 175     realrate = alFixedToDouble(x[0].value.ll);
 176     if (frate != realrate) {
 177       mp_tmsg(MSGT_AO, MSGL_INFO, "[AO SGI] init: samplerate is now %f (desired rate is %f)\n", realrate, frate);
 178     }
 179     sample_rate = (int)realrate;
 180   }
 181
 182   bytes_per_frame = channels * smpwidth;
 183
 184   ao_data.samplerate = sample_rate;
 185   ao_data.channels = channels;
 186   ao_data.format = format;
 187   ao_data.bps = sample_rate * bytes_per_frame;
 188   ao_data.buffersize=131072;
 189   ao_data.outburst = ao_data.buffersize/16;
 190
 191   ao_config = alNewConfig();
 192
 193   if (!ao_config) {
 194     mp_tmsg(MSGT_AO, MSGL_ERR, "[AO SGI] init: %s\n", alGetErrorString(oserror()));
 195     return 0;
 196   }
 197
 198   if(alSetChannels(ao_config, channels) < 0 ||
 199      alSetWidth(ao_config, smpwidth) < 0 ||
 200      alSetSampFmt(ao_config, smpfmt) < 0 ||
 201      alSetQueueSize(ao_config, sample_rate) < 0 ||
 202      alSetDevice(ao_config, rv) < 0) {
 203     mp_tmsg(MSGT_AO, MSGL_ERR, "[AO SGI] init: %s\n", alGetErrorString(oserror()));
 204     return 0;
 205   }
 206
 207   ao_port = alOpenPort("mplayer", "w", ao_config);
 208
 209   if (!ao_port) {
 210     mp_tmsg(MSGT_AO, MSGL_ERR, "[AO SGI] init: Unable to open audio channel: %s\n", alGetErrorString(oserror()));
 211     return 0;
 212   }
 213
 214   // printf("ao_sgi, init: port %d config %d\n", ao_port, ao_config);
 215   queue_size = alGetQueueSize(ao_config);
 216   return 1;
 217
 218 }
 219
 220 // close audio device
 221 static void uninit(int immed) {
 222
 223   /* TODO: samplerate should be set back to the value before mplayer was started! */
 224
 225   mp_tmsg(MSGT_AO, MSGL_INFO, "[AO SGI] uninit: ...\n");
 226
 227   if (ao_config) {
 228     alFreeConfig(ao_config);
 229     ao_config = NULL;
 230   }
 231
 232   if (ao_port) {
 233     if (!immed)
 234     while(alGetFilled(ao_port) > 0) sginap(1);
 235     alClosePort(ao_port);
 236     ao_port = NULL;
 237   }
 238
 239 }
 240
 241 // stop playing and empty buffers (for seeking/pause)
 242 static void reset(void) {
 243
 244   mp_tmsg(MSGT_AO, MSGL_INFO, "[AO SGI] reset: ...\n");
 245
 246   alDiscardFrames(ao_port, queue_size);
 247 }
 248
 249 // stop playing, keep buffers (for pause)
 250 static void audio_pause(void) {
 251
 252   mp_tmsg(MSGT_AO, MSGL_INFO, "[AO SGI] audio_pause: ...\n");
 253
 254 }
 255
 256 // resume playing, after audio_pause()
 257 static void audio_resume(void) {
 258
 259   mp_tmsg(MSGT_AO, MSGL_INFO, "[AO SGI] audio_resume: ...\n");
 260
 261 }
 262
 263 // return: how many bytes can be played without blocking
 264 static int get_space(void) {
 265
 266   // printf("ao_sgi, get_space: (ao_outburst %d)\n", ao_data.outburst);
 267   // printf("ao_sgi, get_space: alGetFillable [%d] \n", alGetFillable(ao_port));
 268
 269   return alGetFillable(ao_port) * bytes_per_frame;
 270
 271 }
 272
 273
 274 // plays 'len' bytes of 'data'
 275 // it should round it down to outburst*n
 276 // return: number of bytes played
 277 static int play(void* data, int len, int flags) {
 278
 279   /* Always process data in quadword-aligned chunks (64-bits). */
 280   const int plen = len / (sizeof(uint64_t) * bytes_per_frame);
 281   const int framecount = plen * sizeof(uint64_t);
 282
 283   // printf("ao_sgi, play: len %d flags %d (%d %d)\n", len, flags, ao_port, ao_config);
 284   // printf("channels %d\n", ao_data.channels);
 285
 286   if(ao_data.format == AF_FORMAT_S32_NE) {
 287     /* The zen of this is explained in fmt2sgial() */
 288     int32_t *smpls = data;
 289     const int32_t *smple = smpls + (framecount * ao_data.channels);
 290     while(smpls < smple)
 291       *smpls++ >>= 8;
 292   }
 293
 294   alWriteFrames(ao_port, data, framecount);
 295
 296   return framecount * bytes_per_frame;
 297
 298 }
 299
 300 // return: delay in seconds between first and last sample in buffer
 301 static float get_delay(void){
 302
 303   // printf("ao_sgi, get_delay: (ao_buffersize %d)\n", ao_buffersize);
 304
 305   // return  (float)queue_size/((float)sample_rate);
 306   const int outstanding = alGetFilled(ao_port);
 307   return (float)((outstanding < 0) ? queue_size : outstanding) /
 308     ((float)sample_rate);
 309 }