1 // SPDX-License-Identifier: GPL-2.0-or-later
5 #include <linux/init.h>
6 #include <linux/slab.h>
8 #include <linux/usb/audio.h>
9 #include <linux/usb/audio-v2.h>
10 #include <linux/usb/audio-v3.h>
12 #include <sound/core.h>
13 #include <sound/pcm.h>
23 * parse the audio format type I descriptor
24 * and returns the corresponding pcm format
27 * @fp: audioformat record
28 * @format: the format tag (wFormatTag)
29 * @fmt: the format type descriptor (v1/v2) or AudioStreaming descriptor (v3)
31 static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,
32 struct audioformat *fp,
33 u64 format, void *_fmt)
35 int sample_width, sample_bytes;
38 switch (fp->protocol) {
41 struct uac_format_type_i_discrete_descriptor *fmt = _fmt;
44 "%u:%d: invalid format type 0x%llx is detected, processed as PCM\n",
45 fp->iface, fp->altsetting, format);
46 format = UAC_FORMAT_TYPE_I_PCM;
48 sample_width = fmt->bBitResolution;
49 sample_bytes = fmt->bSubframeSize;
50 format = 1ULL << format;
55 struct uac_format_type_i_ext_descriptor *fmt = _fmt;
56 sample_width = fmt->bBitResolution;
57 sample_bytes = fmt->bSubslotSize;
59 if (format & UAC2_FORMAT_TYPE_I_RAW_DATA) {
60 pcm_formats |= SNDRV_PCM_FMTBIT_SPECIAL;
61 /* flag potentially raw DSD capable altsettings */
63 /* clear special format bit to avoid "unsupported format" msg below */
64 format &= ~UAC2_FORMAT_TYPE_I_RAW_DATA;
71 struct uac3_as_header_descriptor *as = _fmt;
73 sample_width = as->bBitResolution;
74 sample_bytes = as->bSubslotSize;
76 if (format & UAC3_FORMAT_TYPE_I_RAW_DATA) {
77 pcm_formats |= SNDRV_PCM_FMTBIT_SPECIAL;
78 /* clear special format bit to avoid "unsupported format" msg below */
79 format &= ~UAC3_FORMAT_TYPE_I_RAW_DATA;
87 fp->fmt_bits = sample_width;
89 if ((pcm_formats == 0) &&
90 (format == 0 || format == BIT(UAC_FORMAT_TYPE_I_UNDEFINED))) {
91 /* some devices don't define this correctly... */
92 usb_audio_info(chip, "%u:%d : format type 0 is detected, processed as PCM\n",
93 fp->iface, fp->altsetting);
94 format = BIT(UAC_FORMAT_TYPE_I_PCM);
96 if (format & BIT(UAC_FORMAT_TYPE_I_PCM)) {
97 if (((chip->usb_id == USB_ID(0x0582, 0x0016)) ||
99 (chip->usb_id == USB_ID(0x0582, 0x000c))) &&
101 sample_width == 24 && sample_bytes == 2)
103 else if (sample_width > sample_bytes * 8) {
104 usb_audio_info(chip, "%u:%d : sample bitwidth %d in over sample bytes %d\n",
105 fp->iface, fp->altsetting,
106 sample_width, sample_bytes);
108 /* check the format byte size */
109 switch (sample_bytes) {
111 pcm_formats |= SNDRV_PCM_FMTBIT_S8;
114 if (snd_usb_is_big_endian_format(chip, fp))
115 pcm_formats |= SNDRV_PCM_FMTBIT_S16_BE; /* grrr, big endian!! */
117 pcm_formats |= SNDRV_PCM_FMTBIT_S16_LE;
120 if (snd_usb_is_big_endian_format(chip, fp))
121 pcm_formats |= SNDRV_PCM_FMTBIT_S24_3BE; /* grrr, big endian!! */
123 pcm_formats |= SNDRV_PCM_FMTBIT_S24_3LE;
126 pcm_formats |= SNDRV_PCM_FMTBIT_S32_LE;
130 "%u:%d : unsupported sample bitwidth %d in %d bytes\n",
131 fp->iface, fp->altsetting,
132 sample_width, sample_bytes);
136 if (format & BIT(UAC_FORMAT_TYPE_I_PCM8)) {
137 /* Dallas DS4201 workaround: it advertises U8 format, but really
139 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
140 pcm_formats |= SNDRV_PCM_FMTBIT_S8;
142 pcm_formats |= SNDRV_PCM_FMTBIT_U8;
144 if (format & BIT(UAC_FORMAT_TYPE_I_IEEE_FLOAT))
145 pcm_formats |= SNDRV_PCM_FMTBIT_FLOAT_LE;
146 if (format & BIT(UAC_FORMAT_TYPE_I_ALAW))
147 pcm_formats |= SNDRV_PCM_FMTBIT_A_LAW;
148 if (format & BIT(UAC_FORMAT_TYPE_I_MULAW))
149 pcm_formats |= SNDRV_PCM_FMTBIT_MU_LAW;
150 if (format & ~0x3f) {
152 "%u:%d : unsupported format bits %#llx\n",
153 fp->iface, fp->altsetting, format);
156 pcm_formats |= snd_usb_interface_dsd_format_quirks(chip, fp, sample_bytes);
161 static int set_fixed_rate(struct audioformat *fp, int rate, int rate_bits)
163 kfree(fp->rate_table);
164 fp->rate_table = kmalloc(sizeof(int), GFP_KERNEL);
170 fp->rates = rate_bits;
171 fp->rate_table[0] = rate;
175 /* set up rate_min, rate_max and rates from the rate table */
176 static void set_rate_table_min_max(struct audioformat *fp)
181 fp->rate_min = INT_MAX;
184 for (i = 0; i < fp->nr_rates; i++) {
185 rate = fp->rate_table[i];
186 fp->rate_min = min(fp->rate_min, rate);
187 fp->rate_max = max(fp->rate_max, rate);
188 fp->rates |= snd_pcm_rate_to_rate_bit(rate);
193 * parse the format descriptor and stores the possible sample rates
194 * on the audioformat table (audio class v1).
197 * @fp: audioformat record
198 * @fmt: the format descriptor
199 * @offset: the start offset of descriptor pointing the rate type
200 * (7 for type I and II, 8 for type II)
202 static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audioformat *fp,
203 unsigned char *fmt, int offset)
205 int nr_rates = fmt[offset];
207 if (fmt[0] < offset + 1 + 3 * (nr_rates ? nr_rates : 2)) {
209 "%u:%d : invalid UAC_FORMAT_TYPE desc\n",
210 fp->iface, fp->altsetting);
216 * build the rate table and bitmap flags
220 fp->rate_table = kmalloc_array(nr_rates, sizeof(int),
222 if (fp->rate_table == NULL)
226 for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
227 unsigned int rate = combine_triple(&fmt[idx]);
230 /* C-Media CM6501 mislabels its 96 kHz altsetting */
231 /* Terratec Aureon 7.1 USB C-Media 6206, too */
232 /* Ozone Z90 USB C-Media, too */
233 if (rate == 48000 && nr_rates == 1 &&
234 (chip->usb_id == USB_ID(0x0d8c, 0x0201) ||
235 chip->usb_id == USB_ID(0x0d8c, 0x0102) ||
236 chip->usb_id == USB_ID(0x0d8c, 0x0078) ||
237 chip->usb_id == USB_ID(0x0ccd, 0x00b1)) &&
238 fp->altsetting == 5 && fp->maxpacksize == 392)
240 /* Creative VF0420/VF0470 Live Cams report 16 kHz instead of 8kHz */
242 (chip->usb_id == USB_ID(0x041e, 0x4064) ||
243 chip->usb_id == USB_ID(0x041e, 0x4068)))
246 fp->rate_table[fp->nr_rates++] = rate;
250 "%u:%d: All rates were zero\n",
251 fp->iface, fp->altsetting);
254 set_rate_table_min_max(fp);
256 /* continuous rates */
257 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
258 fp->rate_min = combine_triple(&fmt[offset + 1]);
259 fp->rate_max = combine_triple(&fmt[offset + 4]);
262 /* Jabra Evolve 65 headset */
263 if (chip->usb_id == USB_ID(0x0b0e, 0x030b)) {
264 /* only 48kHz for playback while keeping 16kHz for capture */
265 if (fp->nr_rates != 1)
266 return set_fixed_rate(fp, 48000, SNDRV_PCM_RATE_48000);
274 * Presonus Studio 1810c supports a limited set of sampling
275 * rates per altsetting but reports the full set each time.
276 * If we don't filter out the unsupported rates and attempt
277 * to configure the card, it will hang refusing to do any
278 * further audio I/O until a hard reset is performed.
280 * The list of supported rates per altsetting (set of available
281 * I/O channels) is described in the owner's manual, section 2.2.
283 static bool s1810c_valid_sample_rate(struct audioformat *fp,
286 switch (fp->altsetting) {
288 /* All ADAT ports available */
289 return rate <= 48000;
291 /* Half of ADAT ports available */
292 return (rate == 88200 || rate == 96000);
294 /* Analog I/O only (no S/PDIF nor ADAT) */
295 return rate >= 176400;
303 * Many Focusrite devices supports a limited set of sampling rates per
304 * altsetting. Maximum rate is exposed in the last 4 bytes of Format Type
305 * descriptor which has a non-standard bLength = 10.
307 static bool focusrite_valid_sample_rate(struct snd_usb_audio *chip,
308 struct audioformat *fp,
311 struct usb_interface *iface;
312 struct usb_host_interface *alts;
314 unsigned int max_rate;
316 iface = usb_ifnum_to_if(chip->dev, fp->iface);
320 alts = &iface->altsetting[fp->altset_idx];
321 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen,
322 NULL, UAC_FORMAT_TYPE);
326 if (fmt[0] == 10) { /* bLength */
327 max_rate = combine_quad(&fmt[6]);
329 /* Validate max rate */
330 if (max_rate != 48000 &&
332 max_rate != 192000 &&
333 max_rate != 384000) {
336 "%u:%d : unexpected max rate: %u\n",
337 fp->iface, fp->altsetting, max_rate);
342 return rate <= max_rate;
349 * Helper function to walk the array of sample rate triplets reported by
350 * the device. The problem is that we need to parse whole array first to
351 * get to know how many sample rates we have to expect.
352 * Then fp->rate_table can be allocated and filled.
354 static int parse_uac2_sample_rate_range(struct snd_usb_audio *chip,
355 struct audioformat *fp, int nr_triplets,
356 const unsigned char *data)
360 for (i = 0; i < nr_triplets; i++) {
361 int min = combine_quad(&data[2 + 12 * i]);
362 int max = combine_quad(&data[6 + 12 * i]);
363 int res = combine_quad(&data[10 + 12 * i]);
366 if ((max < 0) || (min < 0) || (res < 0) || (max < min))
370 * for ranges with res == 1, we announce a continuous sample
371 * rate range, and this function should return 0 for no further
377 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
381 for (rate = min; rate <= max; rate += res) {
383 /* Filter out invalid rates on Presonus Studio 1810c */
384 if (chip->usb_id == USB_ID(0x194f, 0x010c) &&
385 !s1810c_valid_sample_rate(fp, rate))
388 /* Filter out invalid rates on Focusrite devices */
389 if (USB_ID_VENDOR(chip->usb_id) == 0x1235 &&
390 !focusrite_valid_sample_rate(chip, fp, rate))
394 fp->rate_table[nr_rates] = rate;
396 if (nr_rates >= MAX_NR_RATES) {
397 usb_audio_err(chip, "invalid uac2 rates\n");
402 /* avoid endless loop */
411 /* Line6 Helix series and the Rode Rodecaster Pro don't support the
412 * UAC2_CS_RANGE usb function call. Return a static table of known
415 static int line6_parse_audio_format_rates_quirk(struct snd_usb_audio *chip,
416 struct audioformat *fp)
418 switch (chip->usb_id) {
419 case USB_ID(0x0e41, 0x4241): /* Line6 Helix */
420 case USB_ID(0x0e41, 0x4242): /* Line6 Helix Rack */
421 case USB_ID(0x0e41, 0x4244): /* Line6 Helix LT */
422 case USB_ID(0x0e41, 0x4246): /* Line6 HX-Stomp */
423 case USB_ID(0x0e41, 0x4253): /* Line6 HX-Stomp XL */
424 case USB_ID(0x0e41, 0x4247): /* Line6 Pod Go */
425 case USB_ID(0x0e41, 0x4248): /* Line6 Helix >= fw 2.82 */
426 case USB_ID(0x0e41, 0x4249): /* Line6 Helix Rack >= fw 2.82 */
427 case USB_ID(0x0e41, 0x424a): /* Line6 Helix LT >= fw 2.82 */
428 case USB_ID(0x0e41, 0x424b): /* Line6 Pod Go */
429 case USB_ID(0x19f7, 0x0011): /* Rode Rodecaster Pro */
430 return set_fixed_rate(fp, 48000, SNDRV_PCM_RATE_48000);
436 /* check whether the given altsetting is supported for the already set rate */
437 static bool check_valid_altsetting_v2v3(struct snd_usb_audio *chip, int iface,
440 struct usb_device *dev = chip->dev;
445 /* we assume 64bit is enough for any altsettings */
446 if (snd_BUG_ON(altsetting >= 64 - 8))
449 err = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_CUR,
450 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
451 UAC2_AS_VAL_ALT_SETTINGS << 8,
452 iface, &raw_data, sizeof(raw_data));
456 data = le64_to_cpu(raw_data);
457 /* first byte contains the bitmap size */
458 if ((data & 0xff) * 8 < altsetting)
460 if (data & (1ULL << (altsetting + 8)))
467 * Validate each sample rate with the altsetting
468 * Rebuild the rate table if only partial values are valid
470 static int validate_sample_rate_table_v2v3(struct snd_usb_audio *chip,
471 struct audioformat *fp,
474 struct usb_device *dev = chip->dev;
475 struct usb_host_interface *alts;
477 unsigned int nr_rates;
481 /* performing the rate verification may lead to unexpected USB bus
482 * behavior afterwards by some unknown reason. Do this only for the
485 if (!(chip->quirk_flags & QUIRK_FLAG_VALIDATE_RATES))
486 return 0; /* don't perform the validation as default */
488 alts = snd_usb_get_host_interface(chip, fp->iface, fp->altsetting);
492 if (fp->protocol == UAC_VERSION_3) {
493 struct uac3_as_header_descriptor *as = snd_usb_find_csint_desc(
494 alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
495 bmControls = le32_to_cpu(as->bmControls);
497 struct uac2_as_header_descriptor *as = snd_usb_find_csint_desc(
498 alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
499 bmControls = as->bmControls;
502 if (!uac_v2v3_control_is_readable(bmControls,
503 UAC2_AS_VAL_ALT_SETTINGS))
506 table = kcalloc(fp->nr_rates, sizeof(*table), GFP_KERNEL);
510 /* clear the interface altsetting at first */
511 usb_set_interface(dev, fp->iface, 0);
514 for (i = 0; i < fp->nr_rates; i++) {
515 err = snd_usb_set_sample_rate_v2v3(chip, fp, clock,
520 if (check_valid_altsetting_v2v3(chip, fp->iface, fp->altsetting))
521 table[nr_rates++] = fp->rate_table[i];
526 "No valid sample rate available for %d:%d, assuming a firmware bug\n",
527 fp->iface, fp->altsetting);
528 nr_rates = fp->nr_rates; /* continue as is */
531 if (fp->nr_rates == nr_rates) {
536 kfree(fp->rate_table);
537 fp->rate_table = table;
538 fp->nr_rates = nr_rates;
543 * parse the format descriptor and stores the possible sample rates
544 * on the audioformat table (audio class v2 and v3).
546 static int parse_audio_format_rates_v2v3(struct snd_usb_audio *chip,
547 struct audioformat *fp)
549 struct usb_device *dev = chip->dev;
550 unsigned char tmp[2], *data;
551 int nr_triplets, data_size, ret = 0, ret_l6;
552 int clock = snd_usb_clock_find_source(chip, fp, false);
553 struct usb_host_interface *ctrl_intf;
555 ctrl_intf = snd_usb_find_ctrl_interface(chip, fp->iface);
558 "%s(): unable to find clock source (clock %d)\n",
563 /* get the number of sample rates first by only fetching 2 bytes */
564 ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
565 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
566 UAC2_CS_CONTROL_SAM_FREQ << 8,
567 snd_usb_ctrl_intf(ctrl_intf) | (clock << 8),
571 /* line6 helix devices don't support UAC2_CS_CONTROL_SAM_FREQ call */
572 ret_l6 = line6_parse_audio_format_rates_quirk(chip, fp);
573 if (ret_l6 == -ENODEV) {
574 /* no line6 device found continue showing the error */
576 "%s(): unable to retrieve number of sample rates (clock %d)\n",
582 "%s(): unable to retrieve number of sample rates: set it to a predefined value (clock %d).\n",
590 nr_triplets = (tmp[1] << 8) | tmp[0];
591 data_size = 2 + 12 * nr_triplets;
592 data = kzalloc(data_size, GFP_KERNEL);
598 /* now get the full information */
599 ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
600 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
601 UAC2_CS_CONTROL_SAM_FREQ << 8,
602 snd_usb_ctrl_intf(ctrl_intf) | (clock << 8),
607 "%s(): unable to retrieve sample rate range (clock %d)\n",
613 /* Call the triplet parser, and make sure fp->rate_table is NULL.
614 * We just use the return value to know how many sample rates we
615 * will have to deal with. */
616 kfree(fp->rate_table);
617 fp->rate_table = NULL;
618 fp->nr_rates = parse_uac2_sample_rate_range(chip, fp, nr_triplets, data);
620 if (fp->nr_rates == 0) {
621 /* SNDRV_PCM_RATE_CONTINUOUS */
626 fp->rate_table = kmalloc_array(fp->nr_rates, sizeof(int), GFP_KERNEL);
627 if (!fp->rate_table) {
632 /* Call the triplet parser again, but this time, fp->rate_table is
633 * allocated, so the rates will be stored */
634 parse_uac2_sample_rate_range(chip, fp, nr_triplets, data);
636 ret = validate_sample_rate_table_v2v3(chip, fp, clock);
640 set_rate_table_min_max(fp);
649 * parse the format type I and III descriptors
651 static int parse_audio_format_i(struct snd_usb_audio *chip,
652 struct audioformat *fp, u64 format,
655 snd_pcm_format_t pcm_format;
656 unsigned int fmt_type;
659 switch (fp->protocol) {
662 case UAC_VERSION_2: {
663 struct uac_format_type_i_continuous_descriptor *fmt = _fmt;
665 fmt_type = fmt->bFormatType;
668 case UAC_VERSION_3: {
669 /* fp->fmt_type is already set in this case */
670 fmt_type = fp->fmt_type;
675 if (fmt_type == UAC_FORMAT_TYPE_III) {
676 /* FIXME: the format type is really IECxxx
677 * but we give normal PCM format to get the existing
680 switch (chip->usb_id) {
682 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
683 if (chip->setup == 0x00 &&
685 pcm_format = SNDRV_PCM_FORMAT_S16_BE;
687 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
690 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
692 fp->formats = pcm_format_to_bits(pcm_format);
694 fp->formats = parse_audio_format_i_type(chip, fp, format, _fmt);
699 /* gather possible sample rates */
700 /* audio class v1 reports possible sample rates as part of the
701 * proprietary class specific descriptor.
702 * audio class v2 uses class specific EP0 range requests for that.
704 switch (fp->protocol) {
706 case UAC_VERSION_1: {
707 struct uac_format_type_i_continuous_descriptor *fmt = _fmt;
709 fp->channels = fmt->bNrChannels;
710 ret = parse_audio_format_rates_v1(chip, fp, (unsigned char *) fmt, 7);
714 case UAC_VERSION_3: {
715 /* fp->channels is already set in this case */
716 ret = parse_audio_format_rates_v2v3(chip, fp);
721 if (fp->channels < 1) {
723 "%u:%d : invalid channels %d\n",
724 fp->iface, fp->altsetting, fp->channels);
732 * parse the format type II descriptor
734 static int parse_audio_format_ii(struct snd_usb_audio *chip,
735 struct audioformat *fp,
736 u64 format, void *_fmt)
738 int brate, framesize, ret;
741 case UAC_FORMAT_TYPE_II_AC3:
742 /* FIXME: there is no AC3 format defined yet */
743 // fp->formats = SNDRV_PCM_FMTBIT_AC3;
744 fp->formats = SNDRV_PCM_FMTBIT_U8; /* temporary hack to receive byte streams */
746 case UAC_FORMAT_TYPE_II_MPEG:
747 fp->formats = SNDRV_PCM_FMTBIT_MPEG;
751 "%u:%d : unknown format tag %#llx is detected. processed as MPEG.\n",
752 fp->iface, fp->altsetting, format);
753 fp->formats = SNDRV_PCM_FMTBIT_MPEG;
759 switch (fp->protocol) {
761 case UAC_VERSION_1: {
762 struct uac_format_type_ii_discrete_descriptor *fmt = _fmt;
763 brate = le16_to_cpu(fmt->wMaxBitRate);
764 framesize = le16_to_cpu(fmt->wSamplesPerFrame);
765 usb_audio_info(chip, "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
766 fp->frame_size = framesize;
767 ret = parse_audio_format_rates_v1(chip, fp, _fmt, 8); /* fmt[8..] sample rates */
770 case UAC_VERSION_2: {
771 struct uac_format_type_ii_ext_descriptor *fmt = _fmt;
772 brate = le16_to_cpu(fmt->wMaxBitRate);
773 framesize = le16_to_cpu(fmt->wSamplesPerFrame);
774 usb_audio_info(chip, "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
775 fp->frame_size = framesize;
776 ret = parse_audio_format_rates_v2v3(chip, fp);
784 int snd_usb_parse_audio_format(struct snd_usb_audio *chip,
785 struct audioformat *fp, u64 format,
786 struct uac_format_type_i_continuous_descriptor *fmt,
791 switch (fmt->bFormatType) {
792 case UAC_FORMAT_TYPE_I:
793 case UAC_FORMAT_TYPE_III:
794 err = parse_audio_format_i(chip, fp, format, fmt);
796 case UAC_FORMAT_TYPE_II:
797 err = parse_audio_format_ii(chip, fp, format, fmt);
801 "%u:%d : format type %d is not supported yet\n",
802 fp->iface, fp->altsetting,
806 fp->fmt_type = fmt->bFormatType;
810 /* FIXME: temporary hack for extigy/audigy 2 nx/zs */
811 /* extigy apparently supports sample rates other than 48k
812 * but not in ordinary way. so we enable only 48k atm.
814 if (chip->usb_id == USB_ID(0x041e, 0x3000) ||
815 chip->usb_id == USB_ID(0x041e, 0x3020) ||
816 chip->usb_id == USB_ID(0x041e, 0x3061)) {
817 if (fmt->bFormatType == UAC_FORMAT_TYPE_I &&
818 fp->rates != SNDRV_PCM_RATE_48000 &&
819 fp->rates != SNDRV_PCM_RATE_96000)
826 int snd_usb_parse_audio_format_v3(struct snd_usb_audio *chip,
827 struct audioformat *fp,
828 struct uac3_as_header_descriptor *as,
831 u64 format = le64_to_cpu(as->bmFormats);
835 * Type I format bits are D0..D6
836 * This test works because type IV is not supported
839 fp->fmt_type = UAC_FORMAT_TYPE_I;
841 fp->fmt_type = UAC_FORMAT_TYPE_III;
843 err = parse_audio_format_i(chip, fp, format, as);