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.
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.
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
18 #include <linux/init.h>
19 #include <linux/usb.h>
20 #include <linux/usb/audio.h>
22 #include <sound/core.h>
23 #include <sound/pcm.h>
32 * parse the audio format type I descriptor
33 * and returns the corresponding pcm format
36 * @fp: audioformat record
37 * @format: the format tag (wFormatTag)
38 * @fmt: the format type descriptor
40 static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,
41 struct audioformat *fp,
42 int format, void *_fmt,
45 int sample_width, sample_bytes;
50 struct uac_format_type_i_discrete_descriptor *fmt = _fmt;
51 sample_width = fmt->bBitResolution;
52 sample_bytes = fmt->bSubframeSize;
58 struct uac_format_type_i_ext_descriptor *fmt = _fmt;
59 sample_width = fmt->bBitResolution;
60 sample_bytes = fmt->bSubslotSize;
71 if (format == 0 || format == (1 << UAC_FORMAT_TYPE_I_UNDEFINED)) {
72 /* some devices don't define this correctly... */
73 snd_printdd(KERN_INFO "%d:%u:%d : format type 0 is detected, processed as PCM\n",
74 chip->dev->devnum, fp->iface, fp->altsetting);
75 format = 1 << UAC_FORMAT_TYPE_I_PCM;
77 if (format & (1 << UAC_FORMAT_TYPE_I_PCM)) {
78 if (sample_width > sample_bytes * 8) {
79 snd_printk(KERN_INFO "%d:%u:%d : sample bitwidth %d in over sample bytes %d\n",
80 chip->dev->devnum, fp->iface, fp->altsetting,
81 sample_width, sample_bytes);
83 /* check the format byte size */
84 switch (sample_bytes) {
86 pcm_formats |= SNDRV_PCM_FMTBIT_S8;
89 if (snd_usb_is_big_endian_format(chip, fp))
90 pcm_formats |= SNDRV_PCM_FMTBIT_S16_BE; /* grrr, big endian!! */
92 pcm_formats |= SNDRV_PCM_FMTBIT_S16_LE;
95 if (snd_usb_is_big_endian_format(chip, fp))
96 pcm_formats |= SNDRV_PCM_FMTBIT_S24_3BE; /* grrr, big endian!! */
98 pcm_formats |= SNDRV_PCM_FMTBIT_S24_3LE;
101 pcm_formats |= SNDRV_PCM_FMTBIT_S32_LE;
104 snd_printk(KERN_INFO "%d:%u:%d : unsupported sample bitwidth %d in %d bytes\n",
105 chip->dev->devnum, fp->iface, fp->altsetting,
106 sample_width, sample_bytes);
110 if (format & (1 << UAC_FORMAT_TYPE_I_PCM8)) {
111 /* Dallas DS4201 workaround: it advertises U8 format, but really
113 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
114 pcm_formats |= SNDRV_PCM_FMTBIT_S8;
116 pcm_formats |= SNDRV_PCM_FMTBIT_U8;
118 if (format & (1 << UAC_FORMAT_TYPE_I_IEEE_FLOAT)) {
119 pcm_formats |= SNDRV_PCM_FMTBIT_FLOAT_LE;
121 if (format & (1 << UAC_FORMAT_TYPE_I_ALAW)) {
122 pcm_formats |= SNDRV_PCM_FMTBIT_A_LAW;
124 if (format & (1 << UAC_FORMAT_TYPE_I_MULAW)) {
125 pcm_formats |= SNDRV_PCM_FMTBIT_MU_LAW;
127 if (format & ~0x3f) {
128 snd_printk(KERN_INFO "%d:%u:%d : unsupported format bits %#x\n",
129 chip->dev->devnum, fp->iface, fp->altsetting, format);
136 * parse the format descriptor and stores the possible sample rates
137 * on the audioformat table (audio class v1).
140 * @fp: audioformat record
141 * @fmt: the format descriptor
142 * @offset: the start offset of descriptor pointing the rate type
143 * (7 for type I and II, 8 for type II)
145 static int parse_audio_format_rates_v1(struct snd_usb_audio *chip, struct audioformat *fp,
146 unsigned char *fmt, int offset)
148 int nr_rates = fmt[offset];
150 if (fmt[0] < offset + 1 + 3 * (nr_rates ? nr_rates : 2)) {
151 snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_FORMAT_TYPE desc\n",
152 chip->dev->devnum, fp->iface, fp->altsetting);
158 * build the rate table and bitmap flags
162 fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
163 if (fp->rate_table == NULL) {
164 snd_printk(KERN_ERR "cannot malloc\n");
169 fp->rate_min = fp->rate_max = 0;
170 for (r = 0, idx = offset + 1; r < nr_rates; r++, idx += 3) {
171 unsigned int rate = combine_triple(&fmt[idx]);
174 /* C-Media CM6501 mislabels its 96 kHz altsetting */
175 if (rate == 48000 && nr_rates == 1 &&
176 (chip->usb_id == USB_ID(0x0d8c, 0x0201) ||
177 chip->usb_id == USB_ID(0x0d8c, 0x0102)) &&
178 fp->altsetting == 5 && fp->maxpacksize == 392)
180 /* Creative VF0470 Live Cam reports 16 kHz instead of 8kHz */
181 if (rate == 16000 && chip->usb_id == USB_ID(0x041e, 0x4068))
184 fp->rate_table[fp->nr_rates] = rate;
185 if (!fp->rate_min || rate < fp->rate_min)
187 if (!fp->rate_max || rate > fp->rate_max)
189 fp->rates |= snd_pcm_rate_to_rate_bit(rate);
193 hwc_debug("All rates were zero. Skipping format!\n");
197 /* continuous rates */
198 fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
199 fp->rate_min = combine_triple(&fmt[offset + 1]);
200 fp->rate_max = combine_triple(&fmt[offset + 4]);
206 * parse the format descriptor and stores the possible sample rates
207 * on the audioformat table (audio class v2).
209 static int parse_audio_format_rates_v2(struct snd_usb_audio *chip,
210 struct audioformat *fp,
211 struct usb_host_interface *iface)
213 struct usb_device *dev = chip->dev;
214 unsigned char tmp[2], *data;
215 int i, nr_rates, data_size, ret = 0;
217 /* get the number of sample rates first by only fetching 2 bytes */
218 ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
219 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
220 0x0100, chip->clock_id << 8, tmp, sizeof(tmp), 1000);
223 snd_printk(KERN_ERR "unable to retrieve number of sample rates\n");
227 nr_rates = (tmp[1] << 8) | tmp[0];
228 data_size = 2 + 12 * nr_rates;
229 data = kzalloc(data_size, GFP_KERNEL);
235 /* now get the full information */
236 ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
237 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
238 0x0100, chip->clock_id << 8, data, data_size, 1000);
241 snd_printk(KERN_ERR "unable to retrieve sample rate range\n");
246 fp->rate_table = kmalloc(sizeof(int) * nr_rates, GFP_KERNEL);
247 if (!fp->rate_table) {
253 fp->rate_min = fp->rate_max = 0;
255 for (i = 0; i < nr_rates; i++) {
256 int rate = combine_quad(&data[2 + 12 * i]);
258 fp->rate_table[fp->nr_rates] = rate;
259 if (!fp->rate_min || rate < fp->rate_min)
261 if (!fp->rate_max || rate > fp->rate_max)
263 fp->rates |= snd_pcm_rate_to_rate_bit(rate);
274 * parse the format type I and III descriptors
276 static int parse_audio_format_i(struct snd_usb_audio *chip,
277 struct audioformat *fp,
278 int format, void *_fmt,
279 struct usb_host_interface *iface)
281 struct usb_interface_descriptor *altsd = get_iface_desc(iface);
282 struct uac_format_type_i_discrete_descriptor *fmt = _fmt;
283 int protocol = altsd->bInterfaceProtocol;
286 if (fmt->bFormatType == UAC_FORMAT_TYPE_III) {
287 /* FIXME: the format type is really IECxxx
288 * but we give normal PCM format to get the existing
291 switch (chip->usb_id) {
293 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
294 if (chip->setup == 0x00 &&
296 pcm_format = SNDRV_PCM_FORMAT_S16_BE;
298 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
301 pcm_format = SNDRV_PCM_FORMAT_S16_LE;
303 fp->formats = 1uLL << pcm_format;
305 fp->formats = parse_audio_format_i_type(chip, fp, format,
311 /* gather possible sample rates */
312 /* audio class v1 reports possible sample rates as part of the
313 * proprietary class specific descriptor.
314 * audio class v2 uses class specific EP0 range requests for that.
318 fp->channels = fmt->bNrChannels;
319 ret = parse_audio_format_rates_v1(chip, fp, _fmt, 7);
322 /* fp->channels is already set in this case */
323 ret = parse_audio_format_rates_v2(chip, fp, iface);
327 if (fp->channels < 1) {
328 snd_printk(KERN_ERR "%d:%u:%d : invalid channels %d\n",
329 chip->dev->devnum, fp->iface, fp->altsetting, fp->channels);
337 * parse the format type II descriptor
339 static int parse_audio_format_ii(struct snd_usb_audio *chip,
340 struct audioformat *fp,
341 int format, void *_fmt,
342 struct usb_host_interface *iface)
344 int brate, framesize, ret;
345 struct usb_interface_descriptor *altsd = get_iface_desc(iface);
346 int protocol = altsd->bInterfaceProtocol;
349 case UAC_FORMAT_TYPE_II_AC3:
350 /* FIXME: there is no AC3 format defined yet */
351 // fp->formats = SNDRV_PCM_FMTBIT_AC3;
352 fp->formats = SNDRV_PCM_FMTBIT_U8; /* temporary hack to receive byte streams */
354 case UAC_FORMAT_TYPE_II_MPEG:
355 fp->formats = SNDRV_PCM_FMTBIT_MPEG;
358 snd_printd(KERN_INFO "%d:%u:%d : unknown format tag %#x is detected. processed as MPEG.\n",
359 chip->dev->devnum, fp->iface, fp->altsetting, format);
360 fp->formats = SNDRV_PCM_FMTBIT_MPEG;
367 case UAC_VERSION_1: {
368 struct uac_format_type_ii_discrete_descriptor *fmt = _fmt;
369 brate = le16_to_cpu(fmt->wMaxBitRate);
370 framesize = le16_to_cpu(fmt->wSamplesPerFrame);
371 snd_printd(KERN_INFO "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
372 fp->frame_size = framesize;
373 ret = parse_audio_format_rates_v1(chip, fp, _fmt, 8); /* fmt[8..] sample rates */
376 case UAC_VERSION_2: {
377 struct uac_format_type_ii_ext_descriptor *fmt = _fmt;
378 brate = le16_to_cpu(fmt->wMaxBitRate);
379 framesize = le16_to_cpu(fmt->wSamplesPerFrame);
380 snd_printd(KERN_INFO "found format II with max.bitrate = %d, frame size=%d\n", brate, framesize);
381 fp->frame_size = framesize;
382 ret = parse_audio_format_rates_v2(chip, fp, iface);
390 int snd_usb_parse_audio_format(struct snd_usb_audio *chip, struct audioformat *fp,
391 int format, unsigned char *fmt, int stream,
392 struct usb_host_interface *iface)
397 case UAC_FORMAT_TYPE_I:
398 case UAC_FORMAT_TYPE_III:
399 err = parse_audio_format_i(chip, fp, format, fmt, iface);
401 case UAC_FORMAT_TYPE_II:
402 err = parse_audio_format_ii(chip, fp, format, fmt, iface);
405 snd_printd(KERN_INFO "%d:%u:%d : format type %d is not supported yet\n",
406 chip->dev->devnum, fp->iface, fp->altsetting, fmt[3]);
409 fp->fmt_type = fmt[3];
413 /* FIXME: temporary hack for extigy/audigy 2 nx/zs */
414 /* extigy apparently supports sample rates other than 48k
415 * but not in ordinary way. so we enable only 48k atm.
417 if (chip->usb_id == USB_ID(0x041e, 0x3000) ||
418 chip->usb_id == USB_ID(0x041e, 0x3020) ||
419 chip->usb_id == USB_ID(0x041e, 0x3061)) {
420 if (fmt[3] == UAC_FORMAT_TYPE_I &&
421 fp->rates != SNDRV_PCM_RATE_48000 &&
422 fp->rates != SNDRV_PCM_RATE_96000)