sound/usb/format.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  15  *
  16  */
  17
  18 #include <linux/init.h>
  19 #include <linux/slab.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/audio.h>
  22 #include <linux/usb/audio-v2.h>
  23
  24 #include <sound/core.h>
  25 #include <sound/pcm.h>
  26
  27 #include "usbaudio.h"
  28 #include "card.h"
  29 #include "quirks.h"
  30 #include "helper.h"
  31 #include "debug.h"
  32 #include "clock.h"
  33 #include "format.h"
  34
  35 /*
  36  * parse the audio format type I descriptor
  37  * and returns the corresponding pcm format
  38  *
  39  * @dev: usb device
  40  * @fp: audioformat record
  41  * @format: the format tag (wFormatTag)
  42  * @fmt: the format type descriptor
  43  */
  44 static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,
  45                                      struct audioformat *fp,
  46                                      int format, void *_fmt,
  47                                      int protocol)
  48 {
  49         int sample_width, sample_bytes;
  50         u64 pcm_formats;
  51
  52         switch (protocol) {
  53         case UAC_VERSION_1:
  54         default: {
  55                 struct uac_format_type_i_discrete_descriptor *fmt = _fmt;
  56                 sample_width = fmt->bBitResolution;
  57                 sample_bytes = fmt->bSubframeSize;
  58                 format = 1 << format;
  59                 break;
  60         }
  61
  62         case UAC_VERSION_2: {
  63                 struct uac_format_type_i_ext_descriptor *fmt = _fmt;
  64                 sample_width = fmt->bBitResolution;
  65                 sample_bytes = fmt->bSubslotSize;
  66                 format <<= 1;
  67                 break;
  68         }
  69         }
  70
  71         pcm_formats = 0;
  72
  73         if (format == 0 || format == (1 << UAC_FORMAT_TYPE_I_UNDEFINED)) {
  74                 /* some devices don't define this correctly... */
  75                 snd_printdd(KERN_INFO "%d:%u:%d : format type 0 is detected, processed as PCM\n",
  76                             chip->dev->devnum, fp->iface, fp->altsetting);
  77                 format = 1 << UAC_FORMAT_TYPE_I_PCM;
  78         }
  79         if (format & (1 << UAC_FORMAT_TYPE_I_PCM)) {
  80                 if (chip->usb_id == USB_ID(0x0582, 0x0016) /* Edirol SD-90 */ &&
  81                     sample_width == 24 && sample_bytes == 2)
  82                         sample_bytes = 3;
  83                 else if (sample_width > sample_bytes * 8) {
  84                         snd_printk(KERN_INFO "%d:%u:%d : sample bitwidth %d in over sample bytes %d\n",
  85                                    chip->dev->devnum, fp->iface, fp->altsetting,
  86                                    sample_width, sample_bytes);
  87                 }
  88                 /* check the format byte size */
  89                 switch (sample_bytes) {
  90                 case 1:
  91                         pcm_formats |= SNDRV_PCM_FMTBIT_S8;
  92                         break;
  93                 case 2:
  94                         if (snd_usb_is_big_endian_format(chip, fp))
  95                                 pcm_formats |= SNDRV_PCM_FMTBIT_S16_BE; /* grrr, big endian!! */
  96                         else
  97                                 pcm_formats |= SNDRV_PCM_FMTBIT_S16_LE;
  98                         break;
  99                 case 3:
 100                         if (snd_usb_is_big_endian_format(chip, fp))
 101                                 pcm_formats |= SNDRV_PCM_FMTBIT_S24_3BE; /* grrr, big endian!! */
 102                         else
 103                                 pcm_formats |= SNDRV_PCM_FMTBIT_S24_3LE;
 104                         break;
 105                 case 4:
 106                         pcm_formats |= SNDRV_PCM_FMTBIT_S32_LE;
 107                         break;
 108                 default:
 109                         snd_printk(KERN_INFO "%d:%u:%d : unsupported sample bitwidth %d in %d bytes\n",
 110                                    chip->dev->devnum, fp->iface, fp->altsetting,
 111                                    sample_width, sample_bytes);
 112                         break;
 113                 }
 114         }
 115         if (format & (1 << UAC_FORMAT_TYPE_I_PCM8)) {
 116                 /* Dallas DS4201 workaround: it advertises U8 format, but really
 117                    supports S8. */
 118                 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
 119                         pcm_formats |= SNDRV_PCM_FMTBIT_S8;
 120                 else
 121                         pcm_formats |= SNDRV_PCM_FMTBIT_U8;
 122         }
 123         if (format & (1 << UAC_FORMAT_TYPE_I_IEEE_FLOAT)) {
 124                 pcm_formats |= SNDRV_PCM_FMTBIT_FLOAT_LE;
 125         }
 126         if (format & (1 << UAC_FORMAT_TYPE_I_ALAW)) {
 127                 pcm_formats |= SNDRV_PCM_FMTBIT_A_LAW;
 128         }
 129         if (format & (1 << UAC_FORMAT_TYPE_I_MULAW)) {
 130                 pcm_formats |= SNDRV_PCM_FMTBIT_MU_LAW;
 131         }
 132         if (format & ~0x3f) {
 133                 snd_printk(KERN_INFO "%d:%u:%d : unsupported format bits %#x\n",
 134                            chip->dev->devnum, fp->iface, fp->altsetting, format);
 135         }
 136         return pcm_formats;
 137 }
 138
 139
 140 /*
 141  * parse the format descriptor and stores the possible sample rates
 142  * on the audioformat table (audio class v1).
 143  *
 144  * @dev: usb device
 145  * @fp: audioformat record
 146  * @fmt: the format descriptor
 147  * @offset: the start offset of descriptor pointing the rate type
 148  *          (7 for type I and II, 8 for type II)
 149  */
 150 static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audioformat *fp,
 151                                        unsigned char *fmt, int offset)
 152 {
 153         int nr_rates = fmt[offset];
 154
 155         if (fmt[0] < offset + 1 + 3 * (nr_rates ? nr_rates : 2)) {
 156                 snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_FORMAT_TYPE desc\n",
 157                                    chip->dev->devnum, fp->iface, fp->altsetting);
 158                 return -1;
 159         }
 160
 161         if (nr_rates) {
 162                 /*
 163                  * build the rate table and bitmap flags
 164                  */
 165                 int r, idx;
 166
 167                 fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
 168                 if (fp->rate_table == NULL) {
 169                         snd_printk(KERN_ERR "cannot malloc\n");
 170                         return -1;
 171                 }
 172
 173                 fp->nr_rates = 0;
 174                 fp->rate_min = fp->rate_max = 0;
 175                 for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
 176                         unsigned int rate = combine_triple(&fmt[idx]);
 177                         if (!rate)
 178                                 continue;
 179                         /* C-Media CM6501 mislabels its 96 kHz altsetting */
 180                         /* Terratec Aureon 7.1 USB C-Media 6206, too */
 181                         if (rate == 48000 && nr_rates == 1 &&
 182                             (chip->usb_id == USB_ID(0x0d8c, 0x0201) ||
 183                              chip->usb_id == USB_ID(0x0d8c, 0x0102) ||
 184                              chip->usb_id == USB_ID(0x0ccd, 0x00b1)) &&
 185                             fp->altsetting == 5 && fp->maxpacksize == 392)
 186                                 rate = 96000;
 187                         /* Creative VF0470 Live Cam reports 16 kHz instead of 8kHz */
 188                         if (rate == 16000 && chip->usb_id == USB_ID(0x041e, 0x4068))
 189                                 rate = 8000;
 190
 191                         fp->rate_table[fp->nr_rates] = rate;
 192                         if (!fp->rate_min || rate < fp->rate_min)
 193                                 fp->rate_min = rate;
 194                         if (!fp->rate_max || rate > fp->rate_max)
 195                                 fp->rate_max = rate;
 196                         fp->rates |= snd_pcm_rate_to_rate_bit(rate);
 197                         fp->nr_rates++;
 198                 }
 199                 if (!fp->nr_rates) {
 200                         hwc_debug("All rates were zero. Skipping format!\n");
 201                         return -1;
 202                 }
 203         } else {
 204                 /* continuous rates */
 205                 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
 206                 fp->rate_min = combine_triple(&fmt[offset + 1]);
 207                 fp->rate_max = combine_triple(&fmt[offset + 4]);
 208         }
 209         return 0;
 210 }
 211
 212 /*
 213  * Helper function to walk the array of sample rate triplets reported by
 214  * the device. The problem is that we need to parse whole array first to
 215  * get to know how many sample rates we have to expect.
 216  * Then fp->rate_table can be allocated and filled.
 217  */
 218 static int parse_uac2_sample_rate_range(struct audioformat *fp, int nr_triplets,
 219                                         const unsigned char *data)
 220 {
 221         int i, nr_rates = 0;
 222
 223         fp->rates = fp->rate_min = fp->rate_max = 0;
 224
 225         for (i = 0; i < nr_triplets; i++) {
 226                 int min = combine_quad(&data[2 + 12 * i]);
 227                 int max = combine_quad(&data[6 + 12 * i]);
 228                 int res = combine_quad(&data[10 + 12 * i]);
 229                 int rate;
 230
 231                 if ((max < 0) || (min < 0) || (res < 0) || (max < min))
 232                         continue;
 233
 234                 /*
 235                  * for ranges with res == 1, we announce a continuous sample
 236                  * rate range, and this function should return 0 for no further
 237                  * parsing.
 238                  */
 239                 if (res == 1) {
 240                         fp->rate_min = min;
 241                         fp->rate_max = max;
 242                         fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
 243                         return 0;
 244                 }
 245
 246                 for (rate = min; rate <= max; rate += res) {
 247                         if (fp->rate_table)
 248                                 fp->rate_table[nr_rates] = rate;
 249                         if (!fp->rate_min || rate < fp->rate_min)
 250                                 fp->rate_min = rate;
 251                         if (!fp->rate_max || rate > fp->rate_max)
 252                                 fp->rate_max = rate;
 253                         fp->rates |= snd_pcm_rate_to_rate_bit(rate);
 254
 255                         nr_rates++;
 256
 257                         /* avoid endless loop */
 258                         if (res == 0)
 259                                 break;
 260                 }
 261         }
 262
 263         return nr_rates;
 264 }
 265
 266 /*
 267  * parse the format descriptor and stores the possible sample rates
 268  * on the audioformat table (audio class v2).
 269  */
 270 static int parse_audio_format_rates_v2(struct snd_usb_audio *chip,
 271                                        struct audioformat *fp)
 272 {
 273         struct usb_device *dev = chip->dev;
 274         unsigned char tmp[2], *data;
 275         int nr_triplets, data_size, ret = 0;
 276         int clock = snd_usb_clock_find_source(chip, fp->clock);
 277
 278         if (clock < 0) {
 279                 snd_printk(KERN_ERR "%s(): unable to find clock source (clock %d)\n",
 280                                 __func__, clock);
 281                 goto err;
 282         }
 283
 284         /* get the number of sample rates first by only fetching 2 bytes */
 285         ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
 286                               USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 287                               UAC2_CS_CONTROL_SAM_FREQ << 8,
 288                               snd_usb_ctrl_intf(chip) | (clock << 8),
 289                               tmp, sizeof(tmp));
 290
 291         if (ret < 0) {
 292                 snd_printk(KERN_ERR "%s(): unable to retrieve number of sample rates (clock %d)\n",
 293                                 __func__, clock);
 294                 goto err;
 295         }
 296
 297         nr_triplets = (tmp[1] << 8) | tmp[0];
 298         data_size = 2 + 12 * nr_triplets;
 299         data = kzalloc(data_size, GFP_KERNEL);
 300         if (!data) {
 301                 ret = -ENOMEM;
 302                 goto err;
 303         }
 304
 305         /* now get the full information */
 306         ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
 307                               USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 308                               UAC2_CS_CONTROL_SAM_FREQ << 8,
 309                               snd_usb_ctrl_intf(chip) | (clock << 8),
 310                               data, data_size);
 311
 312         if (ret < 0) {
 313                 snd_printk(KERN_ERR "%s(): unable to retrieve sample rate range (clock %d)\n",
 314                                 __func__, clock);
 315                 ret = -EINVAL;
 316                 goto err_free;
 317         }
 318
 319         /* Call the triplet parser, and make sure fp->rate_table is NULL.
 320          * We just use the return value to know how many sample rates we
 321          * will have to deal with. */
 322         kfree(fp->rate_table);
 323         fp->rate_table = NULL;
 324         fp->nr_rates = parse_uac2_sample_rate_range(fp, nr_triplets, data);
 325
 326         if (fp->nr_rates == 0) {
 327                 /* SNDRV_PCM_RATE_CONTINUOUS */
 328                 ret = 0;
 329                 goto err_free;
 330         }
 331
 332         fp->rate_table = kmalloc(sizeof(int) * fp->nr_rates, GFP_KERNEL);
 333         if (!fp->rate_table) {
 334                 ret = -ENOMEM;
 335                 goto err_free;
 336         }
 337
 338         /* Call the triplet parser again, but this time, fp->rate_table is
 339          * allocated, so the rates will be stored */
 340         parse_uac2_sample_rate_range(fp, nr_triplets, data);
 341
 342 err_free:
 343         kfree(data);
 344 err:
 345         return ret;
 346 }
 347
 348 /*
 349  * parse the format type I and III descriptors
 350  */
 351 static int parse_audio_format_i(struct snd_usb_audio *chip,
 352                                 struct audioformat *fp, int format,
 353                                 struct uac_format_type_i_continuous_descriptor *fmt,
 354                                 struct usb_host_interface *iface)
 355 {
 356         struct usb_interface_descriptor *altsd = get_iface_desc(iface);
 357         int protocol = altsd->bInterfaceProtocol;
 358         int pcm_format, ret;
 359
 360         if (fmt->bFormatType == UAC_FORMAT_TYPE_III) {
 361                 /* FIXME: the format type is really IECxxx
 362                  *        but we give normal PCM format to get the existing
 363                  *        apps working...
 364                  */
 365                 switch (chip->usb_id) {
 366
 367                 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
 368                         if (chip->setup == 0x00 &&
 369                             fp->altsetting == 6)
 370                                 pcm_format = SNDRV_PCM_FORMAT_S16_BE;
 371                         else
 372                                 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
 373                         break;
 374                 default:
 375                         pcm_format = SNDRV_PCM_FORMAT_S16_LE;
 376                 }
 377                 fp->formats = 1uLL << pcm_format;
 378         } else {
 379                 fp->formats = parse_audio_format_i_type(chip, fp, format,
 380                                                         fmt, protocol);
 381                 if (!fp->formats)
 382                         return -1;
 383         }
 384
 385         /* gather possible sample rates */
 386         /* audio class v1 reports possible sample rates as part of the
 387          * proprietary class specific descriptor.
 388          * audio class v2 uses class specific EP0 range requests for that.
 389          */
 390         switch (protocol) {
 391         default:
 392                 snd_printdd(KERN_WARNING "%d:%u:%d : invalid protocol version %d, assuming v1\n",
 393                            chip->dev->devnum, fp->iface, fp->altsetting, protocol);
 394                 /* fall through */
 395         case UAC_VERSION_1:
 396                 fp->channels = fmt->bNrChannels;
 397                 ret = parse_audio_format_rates_v1(chip, fp, (unsigned char *) fmt, 7);
 398                 break;
 399         case UAC_VERSION_2:
 400                 /* fp->channels is already set in this case */
 401                 ret = parse_audio_format_rates_v2(chip, fp);
 402                 break;
 403         }
 404
 405         if (fp->channels < 1) {
 406                 snd_printk(KERN_ERR "%d:%u:%d : invalid channels %d\n",
 407                            chip->dev->devnum, fp->iface, fp->altsetting, fp->channels);
 408                 return -1;
 409         }
 410
 411         return ret;
 412 }
 413
 414 /*
 415  * parse the format type II descriptor
 416  */
 417 static int parse_audio_format_ii(struct snd_usb_audio *chip,
 418                                  struct audioformat *fp,
 419                                  int format, void *_fmt,
 420                                  struct usb_host_interface *iface)
 421 {
 422         int brate, framesize, ret;
 423         struct usb_interface_descriptor *altsd = get_iface_desc(iface);
 424         int protocol = altsd->bInterfaceProtocol;
 425
 426         switch (format) {
 427         case UAC_FORMAT_TYPE_II_AC3:
 428                 /* FIXME: there is no AC3 format defined yet */
 429                 // fp->formats = SNDRV_PCM_FMTBIT_AC3;
 430                 fp->formats = SNDRV_PCM_FMTBIT_U8; /* temporary hack to receive byte streams */
 431                 break;
 432         case UAC_FORMAT_TYPE_II_MPEG:
 433                 fp->formats = SNDRV_PCM_FMTBIT_MPEG;
 434                 break;
 435         default:
 436                 snd_printd(KERN_INFO "%d:%u:%d : unknown format tag %#x is detected.  processed as MPEG.\n",
 437                            chip->dev->devnum, fp->iface, fp->altsetting, format);
 438                 fp->formats = SNDRV_PCM_FMTBIT_MPEG;
 439                 break;
 440         }
 441
 442         fp->channels = 1;
 443
 444         switch (protocol) {
 445         default:
 446                 snd_printdd(KERN_WARNING "%d:%u:%d : invalid protocol version %d, assuming v1\n",
 447                            chip->dev->devnum, fp->iface, fp->altsetting, protocol);
 448                 /* fall through */
 449         case UAC_VERSION_1: {
 450                 struct uac_format_type_ii_discrete_descriptor *fmt = _fmt;
 451                 brate = le16_to_cpu(fmt->wMaxBitRate);
 452                 framesize = le16_to_cpu(fmt->wSamplesPerFrame);
 453                 snd_printd(KERN_INFO "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
 454                 fp->frame_size = framesize;
 455                 ret = parse_audio_format_rates_v1(chip, fp, _fmt, 8); /* fmt[8..] sample rates */
 456                 break;
 457         }
 458         case UAC_VERSION_2: {
 459                 struct uac_format_type_ii_ext_descriptor *fmt = _fmt;
 460                 brate = le16_to_cpu(fmt->wMaxBitRate);
 461                 framesize = le16_to_cpu(fmt->wSamplesPerFrame);
 462                 snd_printd(KERN_INFO "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
 463                 fp->frame_size = framesize;
 464                 ret = parse_audio_format_rates_v2(chip, fp);
 465                 break;
 466         }
 467         }
 468
 469         return ret;
 470 }
 471
 472 int snd_usb_parse_audio_format(struct snd_usb_audio *chip, struct audioformat *fp,
 473                                int format, struct uac_format_type_i_continuous_descriptor *fmt,
 474                                int stream, struct usb_host_interface *iface)
 475 {
 476         int err;
 477
 478         switch (fmt->bFormatType) {
 479         case UAC_FORMAT_TYPE_I:
 480         case UAC_FORMAT_TYPE_III:
 481                 err = parse_audio_format_i(chip, fp, format, fmt, iface);
 482                 break;
 483         case UAC_FORMAT_TYPE_II:
 484                 err = parse_audio_format_ii(chip, fp, format, fmt, iface);
 485                 break;
 486         default:
 487                 snd_printd(KERN_INFO "%d:%u:%d : format type %d is not supported yet\n",
 488                            chip->dev->devnum, fp->iface, fp->altsetting,
 489                            fmt->bFormatType);
 490                 return -ENOTSUPP;
 491         }
 492         fp->fmt_type = fmt->bFormatType;
 493         if (err < 0)
 494                 return err;
 495 #if 1
 496         /* FIXME: temporary hack for extigy/audigy 2 nx/zs */
 497         /* extigy apparently supports sample rates other than 48k
 498          * but not in ordinary way.  so we enable only 48k atm.
 499          */
 500         if (chip->usb_id == USB_ID(0x041e, 0x3000) ||
 501             chip->usb_id == USB_ID(0x041e, 0x3020) ||
 502             chip->usb_id == USB_ID(0x041e, 0x3061)) {
 503                 if (fmt->bFormatType == UAC_FORMAT_TYPE_I &&
 504                     fp->rates != SNDRV_PCM_RATE_48000 &&
 505                     fp->rates != SNDRV_PCM_RATE_96000)
 506                         return -ENOTSUPP;
 507         }
 508 #endif
 509         return 0;
 510 }
 511