Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 1 | /* pcm.c |
| 2 | ** |
| 3 | ** Copyright 2011, The Android Open Source Project |
| 4 | ** |
| 5 | ** Redistribution and use in source and binary forms, with or without |
| 6 | ** modification, are permitted provided that the following conditions are met: |
| 7 | ** * Redistributions of source code must retain the above copyright |
| 8 | ** notice, this list of conditions and the following disclaimer. |
| 9 | ** * Redistributions in binary form must reproduce the above copyright |
| 10 | ** notice, this list of conditions and the following disclaimer in the |
| 11 | ** documentation and/or other materials provided with the distribution. |
| 12 | ** * Neither the name of The Android Open Source Project nor the names of |
| 13 | ** its contributors may be used to endorse or promote products derived |
| 14 | ** from this software without specific prior written permission. |
| 15 | ** |
| 16 | ** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND |
| 17 | ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 18 | ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 19 | ** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE |
| 20 | ** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 21 | ** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| 22 | ** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| 23 | ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 24 | ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 25 | ** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| 26 | ** DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | #include <stdio.h> |
| 30 | #include <stdlib.h> |
| 31 | #include <fcntl.h> |
| 32 | #include <stdarg.h> |
| 33 | #include <string.h> |
| 34 | #include <errno.h> |
| 35 | #include <unistd.h> |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 36 | #include <poll.h> |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 37 | |
| 38 | #include <sys/ioctl.h> |
| 39 | #include <sys/mman.h> |
| 40 | #include <sys/time.h> |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 41 | #include <limits.h> |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 42 | |
| 43 | #include <linux/ioctl.h> |
| 44 | #define __force |
| 45 | #define __bitwise |
| 46 | #define __user |
| 47 | #include <sound/asound.h> |
| 48 | |
| 49 | #include <tinyalsa/asoundlib.h> |
| 50 | |
| 51 | #define PARAM_MAX SNDRV_PCM_HW_PARAM_LAST_INTERVAL |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 52 | #define SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP (1<<2) |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 53 | |
Andy Hung | 70530a6 | 2014-03-26 18:29:07 -0700 | [diff] [blame] | 54 | /* Logs information into a string; follows snprintf() in that |
| 55 | * offset may be greater than size, and though no characters are copied |
| 56 | * into string, characters are still counted into offset. */ |
| 57 | #define STRLOG(string, offset, size, ...) \ |
| 58 | do { int temp, clipoffset = offset > size ? size : offset; \ |
| 59 | temp = snprintf(string + clipoffset, size - clipoffset, __VA_ARGS__); \ |
| 60 | if (temp > 0) offset += temp; } while (0) |
| 61 | |
| 62 | #ifndef ARRAY_SIZE |
| 63 | #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) |
| 64 | #endif |
| 65 | |
| 66 | /* refer to SNDRV_PCM_ACCESS_##index in sound/asound.h. */ |
| 67 | static const char * const access_lookup[] = { |
| 68 | "MMAP_INTERLEAVED", |
| 69 | "MMAP_NONINTERLEAVED", |
| 70 | "MMAP_COMPLEX", |
| 71 | "RW_INTERLEAVED", |
| 72 | "RW_NONINTERLEAVED", |
| 73 | }; |
| 74 | |
| 75 | /* refer to SNDRV_PCM_FORMAT_##index in sound/asound.h. */ |
| 76 | static const char * const format_lookup[] = { |
| 77 | /*[0] =*/ "S8", |
| 78 | "U8", |
| 79 | "S16_LE", |
| 80 | "S16_BE", |
| 81 | "U16_LE", |
| 82 | "U16_BE", |
| 83 | "S24_LE", |
| 84 | "S24_BE", |
| 85 | "U24_LE", |
| 86 | "U24_BE", |
| 87 | "S32_LE", |
| 88 | "S32_BE", |
| 89 | "U32_LE", |
| 90 | "U32_BE", |
| 91 | "FLOAT_LE", |
| 92 | "FLOAT_BE", |
| 93 | "FLOAT64_LE", |
| 94 | "FLOAT64_BE", |
| 95 | "IEC958_SUBFRAME_LE", |
| 96 | "IEC958_SUBFRAME_BE", |
| 97 | "MU_LAW", |
| 98 | "A_LAW", |
| 99 | "IMA_ADPCM", |
| 100 | "MPEG", |
| 101 | /*[24] =*/ "GSM", |
| 102 | /* gap */ |
| 103 | [31] = "SPECIAL", |
| 104 | "S24_3LE", |
| 105 | "S24_3BE", |
| 106 | "U24_3LE", |
| 107 | "U24_3BE", |
| 108 | "S20_3LE", |
| 109 | "S20_3BE", |
| 110 | "U20_3LE", |
| 111 | "U20_3BE", |
| 112 | "S18_3LE", |
| 113 | "S18_3BE", |
| 114 | "U18_3LE", |
| 115 | /*[43] =*/ "U18_3BE", |
| 116 | #if 0 |
| 117 | /* recent additions, may not be present on local asound.h */ |
| 118 | "G723_24", |
| 119 | "G723_24_1B", |
| 120 | "G723_40", |
| 121 | "G723_40_1B", |
| 122 | "DSD_U8", |
| 123 | "DSD_U16_LE", |
| 124 | #endif |
| 125 | }; |
| 126 | |
| 127 | /* refer to SNDRV_PCM_SUBFORMAT_##index in sound/asound.h. */ |
| 128 | static const char * const subformat_lookup[] = { |
| 129 | "STD", |
| 130 | }; |
| 131 | |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 132 | static inline int param_is_mask(int p) |
| 133 | { |
| 134 | return (p >= SNDRV_PCM_HW_PARAM_FIRST_MASK) && |
| 135 | (p <= SNDRV_PCM_HW_PARAM_LAST_MASK); |
| 136 | } |
| 137 | |
| 138 | static inline int param_is_interval(int p) |
| 139 | { |
| 140 | return (p >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL) && |
| 141 | (p <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL); |
| 142 | } |
| 143 | |
| 144 | static inline struct snd_interval *param_to_interval(struct snd_pcm_hw_params *p, int n) |
| 145 | { |
| 146 | return &(p->intervals[n - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]); |
| 147 | } |
| 148 | |
| 149 | static inline struct snd_mask *param_to_mask(struct snd_pcm_hw_params *p, int n) |
| 150 | { |
| 151 | return &(p->masks[n - SNDRV_PCM_HW_PARAM_FIRST_MASK]); |
| 152 | } |
| 153 | |
| 154 | static void param_set_mask(struct snd_pcm_hw_params *p, int n, unsigned int bit) |
| 155 | { |
| 156 | if (bit >= SNDRV_MASK_MAX) |
| 157 | return; |
| 158 | if (param_is_mask(n)) { |
| 159 | struct snd_mask *m = param_to_mask(p, n); |
| 160 | m->bits[0] = 0; |
| 161 | m->bits[1] = 0; |
| 162 | m->bits[bit >> 5] |= (1 << (bit & 31)); |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | static void param_set_min(struct snd_pcm_hw_params *p, int n, unsigned int val) |
| 167 | { |
| 168 | if (param_is_interval(n)) { |
| 169 | struct snd_interval *i = param_to_interval(p, n); |
| 170 | i->min = val; |
| 171 | } |
| 172 | } |
| 173 | |
Simon Wilson | 42fc2d3 | 2012-12-03 11:18:57 -0800 | [diff] [blame] | 174 | static unsigned int param_get_min(struct snd_pcm_hw_params *p, int n) |
| 175 | { |
| 176 | if (param_is_interval(n)) { |
| 177 | struct snd_interval *i = param_to_interval(p, n); |
| 178 | return i->min; |
| 179 | } |
| 180 | return 0; |
| 181 | } |
| 182 | |
Paul McLean | b25ece4 | 2014-03-21 15:27:34 -0700 | [diff] [blame] | 183 | static void param_set_max(struct snd_pcm_hw_params *p, int n, unsigned int val) |
| 184 | { |
| 185 | if (param_is_interval(n)) { |
| 186 | struct snd_interval *i = param_to_interval(p, n); |
| 187 | i->max = val; |
| 188 | } |
| 189 | } |
| 190 | |
Simon Wilson | 42fc2d3 | 2012-12-03 11:18:57 -0800 | [diff] [blame] | 191 | static unsigned int param_get_max(struct snd_pcm_hw_params *p, int n) |
| 192 | { |
| 193 | if (param_is_interval(n)) { |
| 194 | struct snd_interval *i = param_to_interval(p, n); |
| 195 | return i->max; |
| 196 | } |
| 197 | return 0; |
| 198 | } |
| 199 | |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 200 | static void param_set_int(struct snd_pcm_hw_params *p, int n, unsigned int val) |
| 201 | { |
| 202 | if (param_is_interval(n)) { |
| 203 | struct snd_interval *i = param_to_interval(p, n); |
| 204 | i->min = val; |
| 205 | i->max = val; |
| 206 | i->integer = 1; |
| 207 | } |
| 208 | } |
| 209 | |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 210 | static unsigned int param_get_int(struct snd_pcm_hw_params *p, int n) |
| 211 | { |
| 212 | if (param_is_interval(n)) { |
| 213 | struct snd_interval *i = param_to_interval(p, n); |
| 214 | if (i->integer) |
| 215 | return i->max; |
| 216 | } |
| 217 | return 0; |
| 218 | } |
| 219 | |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 220 | static void param_init(struct snd_pcm_hw_params *p) |
| 221 | { |
| 222 | int n; |
| 223 | |
| 224 | memset(p, 0, sizeof(*p)); |
| 225 | for (n = SNDRV_PCM_HW_PARAM_FIRST_MASK; |
| 226 | n <= SNDRV_PCM_HW_PARAM_LAST_MASK; n++) { |
| 227 | struct snd_mask *m = param_to_mask(p, n); |
| 228 | m->bits[0] = ~0; |
| 229 | m->bits[1] = ~0; |
| 230 | } |
| 231 | for (n = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; |
| 232 | n <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; n++) { |
| 233 | struct snd_interval *i = param_to_interval(p, n); |
| 234 | i->min = 0; |
| 235 | i->max = ~0; |
| 236 | } |
Simon Wilson | 42fc2d3 | 2012-12-03 11:18:57 -0800 | [diff] [blame] | 237 | p->rmask = ~0U; |
| 238 | p->cmask = 0; |
| 239 | p->info = ~0U; |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 240 | } |
| 241 | |
| 242 | #define PCM_ERROR_MAX 128 |
| 243 | |
| 244 | struct pcm { |
| 245 | int fd; |
| 246 | unsigned int flags; |
| 247 | int running:1; |
Omair Mohammed Abdullah | 7a0b995 | 2013-01-31 16:35:39 +0530 | [diff] [blame] | 248 | int prepared:1; |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 249 | int underruns; |
| 250 | unsigned int buffer_size; |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 251 | unsigned int boundary; |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 252 | char error[PCM_ERROR_MAX]; |
| 253 | struct pcm_config config; |
Simon Wilson | dd88f13 | 2011-07-25 10:58:30 -0700 | [diff] [blame] | 254 | struct snd_pcm_mmap_status *mmap_status; |
| 255 | struct snd_pcm_mmap_control *mmap_control; |
| 256 | struct snd_pcm_sync_ptr *sync_ptr; |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 257 | void *mmap_buffer; |
| 258 | unsigned int noirq_frames_per_msec; |
Eric Laurent | 73b9c67 | 2011-10-14 11:12:24 -0700 | [diff] [blame] | 259 | int wait_for_avail_min; |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 260 | }; |
| 261 | |
| 262 | unsigned int pcm_get_buffer_size(struct pcm *pcm) |
| 263 | { |
| 264 | return pcm->buffer_size; |
| 265 | } |
| 266 | |
| 267 | const char* pcm_get_error(struct pcm *pcm) |
| 268 | { |
| 269 | return pcm->error; |
| 270 | } |
| 271 | |
| 272 | static int oops(struct pcm *pcm, int e, const char *fmt, ...) |
| 273 | { |
| 274 | va_list ap; |
| 275 | int sz; |
| 276 | |
| 277 | va_start(ap, fmt); |
| 278 | vsnprintf(pcm->error, PCM_ERROR_MAX, fmt, ap); |
| 279 | va_end(ap); |
| 280 | sz = strlen(pcm->error); |
| 281 | |
| 282 | if (errno) |
| 283 | snprintf(pcm->error + sz, PCM_ERROR_MAX - sz, |
| 284 | ": %s", strerror(e)); |
| 285 | return -1; |
| 286 | } |
| 287 | |
Simon Wilson | 83b1d6d | 2011-06-15 17:20:55 -0700 | [diff] [blame] | 288 | static unsigned int pcm_format_to_alsa(enum pcm_format format) |
| 289 | { |
| 290 | switch (format) { |
| 291 | case PCM_FORMAT_S32_LE: |
| 292 | return SNDRV_PCM_FORMAT_S32_LE; |
Simon Wilson | da39e0b | 2012-11-09 15:16:47 -0800 | [diff] [blame] | 293 | case PCM_FORMAT_S8: |
| 294 | return SNDRV_PCM_FORMAT_S8; |
Glenn Kasten | d9837d0 | 2014-01-31 07:56:33 -0800 | [diff] [blame] | 295 | case PCM_FORMAT_S24_3LE: |
| 296 | return SNDRV_PCM_FORMAT_S24_3LE; |
Simon Wilson | da39e0b | 2012-11-09 15:16:47 -0800 | [diff] [blame] | 297 | case PCM_FORMAT_S24_LE: |
| 298 | return SNDRV_PCM_FORMAT_S24_LE; |
Simon Wilson | 83b1d6d | 2011-06-15 17:20:55 -0700 | [diff] [blame] | 299 | default: |
| 300 | case PCM_FORMAT_S16_LE: |
| 301 | return SNDRV_PCM_FORMAT_S16_LE; |
| 302 | }; |
| 303 | } |
| 304 | |
Simon Wilson | 36ea2d8 | 2013-07-17 11:10:45 -0700 | [diff] [blame] | 305 | unsigned int pcm_format_to_bits(enum pcm_format format) |
Simon Wilson | 83b1d6d | 2011-06-15 17:20:55 -0700 | [diff] [blame] | 306 | { |
| 307 | switch (format) { |
| 308 | case PCM_FORMAT_S32_LE: |
Simon Wilson | 36ea2d8 | 2013-07-17 11:10:45 -0700 | [diff] [blame] | 309 | case PCM_FORMAT_S24_LE: |
Simon Wilson | 83b1d6d | 2011-06-15 17:20:55 -0700 | [diff] [blame] | 310 | return 32; |
Glenn Kasten | d9837d0 | 2014-01-31 07:56:33 -0800 | [diff] [blame] | 311 | case PCM_FORMAT_S24_3LE: |
| 312 | return 24; |
Simon Wilson | 83b1d6d | 2011-06-15 17:20:55 -0700 | [diff] [blame] | 313 | default: |
| 314 | case PCM_FORMAT_S16_LE: |
| 315 | return 16; |
| 316 | }; |
| 317 | } |
| 318 | |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 319 | unsigned int pcm_bytes_to_frames(struct pcm *pcm, unsigned int bytes) |
| 320 | { |
| 321 | return bytes / (pcm->config.channels * |
| 322 | (pcm_format_to_bits(pcm->config.format) >> 3)); |
| 323 | } |
| 324 | |
| 325 | unsigned int pcm_frames_to_bytes(struct pcm *pcm, unsigned int frames) |
| 326 | { |
| 327 | return frames * pcm->config.channels * |
| 328 | (pcm_format_to_bits(pcm->config.format) >> 3); |
| 329 | } |
| 330 | |
Simon Wilson | dd88f13 | 2011-07-25 10:58:30 -0700 | [diff] [blame] | 331 | static int pcm_sync_ptr(struct pcm *pcm, int flags) { |
| 332 | if (pcm->sync_ptr) { |
| 333 | pcm->sync_ptr->flags = flags; |
| 334 | if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_SYNC_PTR, pcm->sync_ptr) < 0) |
| 335 | return -1; |
| 336 | } |
| 337 | return 0; |
| 338 | } |
| 339 | |
| 340 | static int pcm_hw_mmap_status(struct pcm *pcm) { |
| 341 | |
| 342 | if (pcm->sync_ptr) |
| 343 | return 0; |
| 344 | |
| 345 | int page_size = sysconf(_SC_PAGE_SIZE); |
| 346 | pcm->mmap_status = mmap(NULL, page_size, PROT_READ, MAP_FILE | MAP_SHARED, |
| 347 | pcm->fd, SNDRV_PCM_MMAP_OFFSET_STATUS); |
| 348 | if (pcm->mmap_status == MAP_FAILED) |
| 349 | pcm->mmap_status = NULL; |
| 350 | if (!pcm->mmap_status) |
| 351 | goto mmap_error; |
| 352 | |
| 353 | pcm->mmap_control = mmap(NULL, page_size, PROT_READ | PROT_WRITE, |
| 354 | MAP_FILE | MAP_SHARED, pcm->fd, SNDRV_PCM_MMAP_OFFSET_CONTROL); |
| 355 | if (pcm->mmap_control == MAP_FAILED) |
| 356 | pcm->mmap_control = NULL; |
| 357 | if (!pcm->mmap_control) { |
| 358 | munmap(pcm->mmap_status, page_size); |
| 359 | pcm->mmap_status = NULL; |
| 360 | goto mmap_error; |
| 361 | } |
Eric Laurent | 73b9c67 | 2011-10-14 11:12:24 -0700 | [diff] [blame] | 362 | if (pcm->flags & PCM_MMAP) |
| 363 | pcm->mmap_control->avail_min = pcm->config.avail_min; |
| 364 | else |
| 365 | pcm->mmap_control->avail_min = 1; |
Simon Wilson | dd88f13 | 2011-07-25 10:58:30 -0700 | [diff] [blame] | 366 | |
| 367 | return 0; |
| 368 | |
| 369 | mmap_error: |
| 370 | |
| 371 | pcm->sync_ptr = calloc(1, sizeof(*pcm->sync_ptr)); |
| 372 | if (!pcm->sync_ptr) |
| 373 | return -ENOMEM; |
| 374 | pcm->mmap_status = &pcm->sync_ptr->s.status; |
| 375 | pcm->mmap_control = &pcm->sync_ptr->c.control; |
Eric Laurent | 73b9c67 | 2011-10-14 11:12:24 -0700 | [diff] [blame] | 376 | if (pcm->flags & PCM_MMAP) |
| 377 | pcm->mmap_control->avail_min = pcm->config.avail_min; |
| 378 | else |
| 379 | pcm->mmap_control->avail_min = 1; |
| 380 | |
Simon Wilson | dd88f13 | 2011-07-25 10:58:30 -0700 | [diff] [blame] | 381 | pcm_sync_ptr(pcm, 0); |
| 382 | |
| 383 | return 0; |
| 384 | } |
| 385 | |
| 386 | static void pcm_hw_munmap_status(struct pcm *pcm) { |
| 387 | if (pcm->sync_ptr) { |
| 388 | free(pcm->sync_ptr); |
| 389 | pcm->sync_ptr = NULL; |
| 390 | } else { |
| 391 | int page_size = sysconf(_SC_PAGE_SIZE); |
| 392 | if (pcm->mmap_status) |
| 393 | munmap(pcm->mmap_status, page_size); |
| 394 | if (pcm->mmap_control) |
| 395 | munmap(pcm->mmap_control, page_size); |
| 396 | } |
| 397 | pcm->mmap_status = NULL; |
| 398 | pcm->mmap_control = NULL; |
| 399 | } |
| 400 | |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 401 | static int pcm_areas_copy(struct pcm *pcm, unsigned int pcm_offset, |
Eric Laurent | c98da79 | 2013-09-16 14:31:17 -0700 | [diff] [blame] | 402 | char *buf, unsigned int src_offset, |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 403 | unsigned int frames) |
| 404 | { |
| 405 | int size_bytes = pcm_frames_to_bytes(pcm, frames); |
| 406 | int pcm_offset_bytes = pcm_frames_to_bytes(pcm, pcm_offset); |
| 407 | int src_offset_bytes = pcm_frames_to_bytes(pcm, src_offset); |
| 408 | |
| 409 | /* interleaved only atm */ |
Eric Laurent | c98da79 | 2013-09-16 14:31:17 -0700 | [diff] [blame] | 410 | if (pcm->flags & PCM_IN) |
| 411 | memcpy(buf + src_offset_bytes, |
| 412 | (char*)pcm->mmap_buffer + pcm_offset_bytes, |
| 413 | size_bytes); |
| 414 | else |
| 415 | memcpy((char*)pcm->mmap_buffer + pcm_offset_bytes, |
| 416 | buf + src_offset_bytes, |
| 417 | size_bytes); |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 418 | return 0; |
| 419 | } |
| 420 | |
Eric Laurent | c98da79 | 2013-09-16 14:31:17 -0700 | [diff] [blame] | 421 | static int pcm_mmap_transfer_areas(struct pcm *pcm, char *buf, |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 422 | unsigned int offset, unsigned int size) |
| 423 | { |
| 424 | void *pcm_areas; |
| 425 | int commit; |
| 426 | unsigned int pcm_offset, frames, count = 0; |
| 427 | |
| 428 | while (size > 0) { |
| 429 | frames = size; |
| 430 | pcm_mmap_begin(pcm, &pcm_areas, &pcm_offset, &frames); |
Eric Laurent | c98da79 | 2013-09-16 14:31:17 -0700 | [diff] [blame] | 431 | pcm_areas_copy(pcm, pcm_offset, buf, offset, frames); |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 432 | commit = pcm_mmap_commit(pcm, pcm_offset, frames); |
| 433 | if (commit < 0) { |
| 434 | oops(pcm, commit, "failed to commit %d frames\n", frames); |
| 435 | return commit; |
| 436 | } |
| 437 | |
| 438 | offset += commit; |
| 439 | count += commit; |
| 440 | size -= commit; |
| 441 | } |
| 442 | return count; |
| 443 | } |
| 444 | |
Simon Wilson | dd88f13 | 2011-07-25 10:58:30 -0700 | [diff] [blame] | 445 | int pcm_get_htimestamp(struct pcm *pcm, unsigned int *avail, |
| 446 | struct timespec *tstamp) |
| 447 | { |
| 448 | int frames; |
| 449 | int rc; |
| 450 | snd_pcm_uframes_t hw_ptr; |
| 451 | |
| 452 | if (!pcm_is_ready(pcm)) |
| 453 | return -1; |
| 454 | |
| 455 | rc = pcm_sync_ptr(pcm, SNDRV_PCM_SYNC_PTR_APPL|SNDRV_PCM_SYNC_PTR_HWSYNC); |
| 456 | if (rc < 0) |
| 457 | return -1; |
| 458 | |
Simon Wilson | 8dd366f | 2011-11-17 13:16:52 -0800 | [diff] [blame] | 459 | if ((pcm->mmap_status->state != PCM_STATE_RUNNING) && |
| 460 | (pcm->mmap_status->state != PCM_STATE_DRAINING)) |
Simon Wilson | 5aed71d | 2011-11-16 14:45:38 -0800 | [diff] [blame] | 461 | return -1; |
| 462 | |
Simon Wilson | dd88f13 | 2011-07-25 10:58:30 -0700 | [diff] [blame] | 463 | *tstamp = pcm->mmap_status->tstamp; |
| 464 | if (tstamp->tv_sec == 0 && tstamp->tv_nsec == 0) |
| 465 | return -1; |
| 466 | |
| 467 | hw_ptr = pcm->mmap_status->hw_ptr; |
| 468 | if (pcm->flags & PCM_IN) |
| 469 | frames = hw_ptr - pcm->mmap_control->appl_ptr; |
| 470 | else |
| 471 | frames = hw_ptr + pcm->buffer_size - pcm->mmap_control->appl_ptr; |
| 472 | |
| 473 | if (frames < 0) |
Eric Laurent | 73b9c67 | 2011-10-14 11:12:24 -0700 | [diff] [blame] | 474 | frames += pcm->boundary; |
| 475 | else if (frames > (int)pcm->boundary) |
| 476 | frames -= pcm->boundary; |
Simon Wilson | dd88f13 | 2011-07-25 10:58:30 -0700 | [diff] [blame] | 477 | |
| 478 | *avail = (unsigned int)frames; |
| 479 | |
| 480 | return 0; |
| 481 | } |
| 482 | |
Simon Wilson | daa8329 | 2012-02-28 15:26:02 -0800 | [diff] [blame] | 483 | int pcm_write(struct pcm *pcm, const void *data, unsigned int count) |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 484 | { |
| 485 | struct snd_xferi x; |
| 486 | |
| 487 | if (pcm->flags & PCM_IN) |
| 488 | return -EINVAL; |
| 489 | |
Simon Wilson | daa8329 | 2012-02-28 15:26:02 -0800 | [diff] [blame] | 490 | x.buf = (void*)data; |
Simon Wilson | 83b1d6d | 2011-06-15 17:20:55 -0700 | [diff] [blame] | 491 | x.frames = count / (pcm->config.channels * |
| 492 | pcm_format_to_bits(pcm->config.format) / 8); |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 493 | |
| 494 | for (;;) { |
| 495 | if (!pcm->running) { |
Omair Mohammed Abdullah | 7a0b995 | 2013-01-31 16:35:39 +0530 | [diff] [blame] | 496 | int prepare_error = pcm_prepare(pcm); |
| 497 | if (prepare_error) |
| 498 | return prepare_error; |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 499 | if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_WRITEI_FRAMES, &x)) |
| 500 | return oops(pcm, errno, "cannot write initial data"); |
| 501 | pcm->running = 1; |
| 502 | return 0; |
| 503 | } |
| 504 | if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_WRITEI_FRAMES, &x)) { |
Omair Mohammed Abdullah | 7a0b995 | 2013-01-31 16:35:39 +0530 | [diff] [blame] | 505 | pcm->prepared = 0; |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 506 | pcm->running = 0; |
| 507 | if (errno == EPIPE) { |
John Grossman | 673253a | 2012-04-03 16:37:38 -0700 | [diff] [blame] | 508 | /* we failed to make our window -- try to restart if we are |
| 509 | * allowed to do so. Otherwise, simply allow the EPIPE error to |
| 510 | * propagate up to the app level */ |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 511 | pcm->underruns++; |
John Grossman | 673253a | 2012-04-03 16:37:38 -0700 | [diff] [blame] | 512 | if (pcm->flags & PCM_NORESTART) |
| 513 | return -EPIPE; |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 514 | continue; |
| 515 | } |
| 516 | return oops(pcm, errno, "cannot write stream data"); |
| 517 | } |
| 518 | return 0; |
| 519 | } |
| 520 | } |
| 521 | |
| 522 | int pcm_read(struct pcm *pcm, void *data, unsigned int count) |
| 523 | { |
| 524 | struct snd_xferi x; |
| 525 | |
| 526 | if (!(pcm->flags & PCM_IN)) |
| 527 | return -EINVAL; |
| 528 | |
| 529 | x.buf = data; |
Simon Wilson | 83b1d6d | 2011-06-15 17:20:55 -0700 | [diff] [blame] | 530 | x.frames = count / (pcm->config.channels * |
| 531 | pcm_format_to_bits(pcm->config.format) / 8); |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 532 | |
| 533 | for (;;) { |
| 534 | if (!pcm->running) { |
Simon Wilson | 85dc38f | 2012-05-15 17:37:19 -0700 | [diff] [blame] | 535 | if (pcm_start(pcm) < 0) { |
| 536 | fprintf(stderr, "start error"); |
| 537 | return -errno; |
| 538 | } |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 539 | } |
| 540 | if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_READI_FRAMES, &x)) { |
Omair Mohammed Abdullah | 7a0b995 | 2013-01-31 16:35:39 +0530 | [diff] [blame] | 541 | pcm->prepared = 0; |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 542 | pcm->running = 0; |
| 543 | if (errno == EPIPE) { |
| 544 | /* we failed to make our window -- try to restart */ |
| 545 | pcm->underruns++; |
| 546 | continue; |
| 547 | } |
| 548 | return oops(pcm, errno, "cannot read stream data"); |
| 549 | } |
| 550 | return 0; |
| 551 | } |
| 552 | } |
| 553 | |
| 554 | static struct pcm bad_pcm = { |
| 555 | .fd = -1, |
| 556 | }; |
| 557 | |
Simon Wilson | 42fc2d3 | 2012-12-03 11:18:57 -0800 | [diff] [blame] | 558 | struct pcm_params *pcm_params_get(unsigned int card, unsigned int device, |
| 559 | unsigned int flags) |
| 560 | { |
| 561 | struct snd_pcm_hw_params *params; |
| 562 | char fn[256]; |
| 563 | int fd; |
| 564 | |
| 565 | snprintf(fn, sizeof(fn), "/dev/snd/pcmC%uD%u%c", card, device, |
| 566 | flags & PCM_IN ? 'c' : 'p'); |
| 567 | |
| 568 | fd = open(fn, O_RDWR); |
| 569 | if (fd < 0) { |
| 570 | fprintf(stderr, "cannot open device '%s'\n", fn); |
| 571 | goto err_open; |
| 572 | } |
| 573 | |
| 574 | params = calloc(1, sizeof(struct snd_pcm_hw_params)); |
| 575 | if (!params) |
| 576 | goto err_calloc; |
| 577 | |
| 578 | param_init(params); |
| 579 | if (ioctl(fd, SNDRV_PCM_IOCTL_HW_REFINE, params)) { |
| 580 | fprintf(stderr, "SNDRV_PCM_IOCTL_HW_REFINE error (%d)\n", errno); |
| 581 | goto err_hw_refine; |
| 582 | } |
| 583 | |
| 584 | close(fd); |
| 585 | |
| 586 | return (struct pcm_params *)params; |
| 587 | |
| 588 | err_hw_refine: |
| 589 | free(params); |
| 590 | err_calloc: |
| 591 | close(fd); |
| 592 | err_open: |
| 593 | return NULL; |
| 594 | } |
| 595 | |
| 596 | void pcm_params_free(struct pcm_params *pcm_params) |
| 597 | { |
| 598 | struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params; |
| 599 | |
| 600 | if (params) |
| 601 | free(params); |
| 602 | } |
| 603 | |
| 604 | static int pcm_param_to_alsa(enum pcm_param param) |
| 605 | { |
| 606 | switch (param) { |
Andy Hung | a5b44d9 | 2014-03-10 18:08:15 -0700 | [diff] [blame] | 607 | case PCM_PARAM_ACCESS: |
| 608 | return SNDRV_PCM_HW_PARAM_ACCESS; |
| 609 | case PCM_PARAM_FORMAT: |
| 610 | return SNDRV_PCM_HW_PARAM_FORMAT; |
| 611 | case PCM_PARAM_SUBFORMAT: |
| 612 | return SNDRV_PCM_HW_PARAM_SUBFORMAT; |
Simon Wilson | 42fc2d3 | 2012-12-03 11:18:57 -0800 | [diff] [blame] | 613 | case PCM_PARAM_SAMPLE_BITS: |
| 614 | return SNDRV_PCM_HW_PARAM_SAMPLE_BITS; |
| 615 | break; |
| 616 | case PCM_PARAM_FRAME_BITS: |
| 617 | return SNDRV_PCM_HW_PARAM_FRAME_BITS; |
| 618 | break; |
| 619 | case PCM_PARAM_CHANNELS: |
| 620 | return SNDRV_PCM_HW_PARAM_CHANNELS; |
| 621 | break; |
| 622 | case PCM_PARAM_RATE: |
| 623 | return SNDRV_PCM_HW_PARAM_RATE; |
| 624 | break; |
| 625 | case PCM_PARAM_PERIOD_TIME: |
| 626 | return SNDRV_PCM_HW_PARAM_PERIOD_TIME; |
| 627 | break; |
| 628 | case PCM_PARAM_PERIOD_SIZE: |
| 629 | return SNDRV_PCM_HW_PARAM_PERIOD_SIZE; |
| 630 | break; |
| 631 | case PCM_PARAM_PERIOD_BYTES: |
| 632 | return SNDRV_PCM_HW_PARAM_PERIOD_BYTES; |
| 633 | break; |
| 634 | case PCM_PARAM_PERIODS: |
| 635 | return SNDRV_PCM_HW_PARAM_PERIODS; |
| 636 | break; |
| 637 | case PCM_PARAM_BUFFER_TIME: |
| 638 | return SNDRV_PCM_HW_PARAM_BUFFER_TIME; |
| 639 | break; |
| 640 | case PCM_PARAM_BUFFER_SIZE: |
| 641 | return SNDRV_PCM_HW_PARAM_BUFFER_SIZE; |
| 642 | break; |
| 643 | case PCM_PARAM_BUFFER_BYTES: |
| 644 | return SNDRV_PCM_HW_PARAM_BUFFER_BYTES; |
| 645 | break; |
| 646 | case PCM_PARAM_TICK_TIME: |
| 647 | return SNDRV_PCM_HW_PARAM_TICK_TIME; |
| 648 | break; |
| 649 | |
| 650 | default: |
| 651 | return -1; |
| 652 | } |
| 653 | } |
| 654 | |
Andy Hung | a5b44d9 | 2014-03-10 18:08:15 -0700 | [diff] [blame] | 655 | struct pcm_mask *pcm_params_get_mask(struct pcm_params *pcm_params, |
| 656 | enum pcm_param param) |
| 657 | { |
| 658 | int p; |
| 659 | struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params; |
| 660 | if (params == NULL) { |
| 661 | return NULL; |
| 662 | } |
| 663 | |
| 664 | p = pcm_param_to_alsa(param); |
| 665 | if (p < 0 || !param_is_mask(p)) { |
| 666 | return NULL; |
| 667 | } |
| 668 | |
| 669 | return (struct pcm_mask *)param_to_mask(params, p); |
| 670 | } |
| 671 | |
Simon Wilson | 42fc2d3 | 2012-12-03 11:18:57 -0800 | [diff] [blame] | 672 | unsigned int pcm_params_get_min(struct pcm_params *pcm_params, |
| 673 | enum pcm_param param) |
| 674 | { |
| 675 | struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params; |
| 676 | int p; |
| 677 | |
| 678 | if (!params) |
| 679 | return 0; |
| 680 | |
| 681 | p = pcm_param_to_alsa(param); |
| 682 | if (p < 0) |
| 683 | return 0; |
| 684 | |
| 685 | return param_get_min(params, p); |
| 686 | } |
| 687 | |
Paul McLean | b25ece4 | 2014-03-21 15:27:34 -0700 | [diff] [blame] | 688 | void pcm_params_set_min(struct pcm_params *pcm_params, |
| 689 | enum pcm_param param, unsigned int val) |
| 690 | { |
| 691 | struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params; |
| 692 | int p; |
| 693 | |
| 694 | if (!params) |
| 695 | return; |
| 696 | |
| 697 | p = pcm_param_to_alsa(param); |
| 698 | if (p < 0) |
| 699 | return; |
| 700 | |
| 701 | param_set_min(params, p, val); |
| 702 | } |
| 703 | |
Simon Wilson | 42fc2d3 | 2012-12-03 11:18:57 -0800 | [diff] [blame] | 704 | unsigned int pcm_params_get_max(struct pcm_params *pcm_params, |
| 705 | enum pcm_param param) |
| 706 | { |
| 707 | struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params; |
| 708 | int p; |
| 709 | |
| 710 | if (!params) |
| 711 | return 0; |
| 712 | |
| 713 | p = pcm_param_to_alsa(param); |
| 714 | if (p < 0) |
| 715 | return 0; |
| 716 | |
| 717 | return param_get_max(params, p); |
| 718 | } |
| 719 | |
Paul McLean | b25ece4 | 2014-03-21 15:27:34 -0700 | [diff] [blame] | 720 | void pcm_params_set_max(struct pcm_params *pcm_params, |
| 721 | enum pcm_param param, unsigned int val) |
| 722 | { |
| 723 | struct snd_pcm_hw_params *params = (struct snd_pcm_hw_params *)pcm_params; |
| 724 | int p; |
| 725 | |
| 726 | if (!params) |
| 727 | return; |
| 728 | |
| 729 | p = pcm_param_to_alsa(param); |
| 730 | if (p < 0) |
| 731 | return; |
| 732 | |
| 733 | param_set_max(params, p, val); |
| 734 | } |
| 735 | |
Andy Hung | 70530a6 | 2014-03-26 18:29:07 -0700 | [diff] [blame] | 736 | static int pcm_mask_test(struct pcm_mask *m, unsigned int index) |
| 737 | { |
| 738 | const unsigned int bitshift = 5; /* for 32 bit integer */ |
| 739 | const unsigned int bitmask = (1 << bitshift) - 1; |
| 740 | unsigned int element; |
| 741 | |
| 742 | element = index >> bitshift; |
| 743 | if (element >= ARRAY_SIZE(m->bits)) |
| 744 | return 0; /* for safety, but should never occur */ |
| 745 | return (m->bits[element] >> (index & bitmask)) & 1; |
| 746 | } |
| 747 | |
| 748 | static int pcm_mask_to_string(struct pcm_mask *m, char *string, unsigned int size, |
| 749 | char *mask_name, |
| 750 | const char * const *bit_array_name, size_t bit_array_size) |
| 751 | { |
| 752 | unsigned int i; |
| 753 | unsigned int offset = 0; |
| 754 | |
| 755 | if (m == NULL) |
| 756 | return 0; |
| 757 | if (bit_array_size < 32) { |
| 758 | STRLOG(string, offset, size, "%12s:\t%#08x\n", mask_name, m->bits[0]); |
| 759 | } else { /* spans two or more bitfields, print with an array index */ |
| 760 | for (i = 0; i < (bit_array_size + 31) >> 5; ++i) { |
| 761 | STRLOG(string, offset, size, "%9s[%d]:\t%#08x\n", |
| 762 | mask_name, i, m->bits[i]); |
| 763 | } |
| 764 | } |
| 765 | for (i = 0; i < bit_array_size; ++i) { |
| 766 | if (pcm_mask_test(m, i)) { |
| 767 | STRLOG(string, offset, size, "%12s \t%s\n", "", bit_array_name[i]); |
| 768 | } |
| 769 | } |
| 770 | return offset; |
| 771 | } |
| 772 | |
| 773 | int pcm_params_to_string(struct pcm_params *params, char *string, unsigned int size) |
| 774 | { |
| 775 | struct pcm_mask *m; |
| 776 | unsigned int min, max; |
| 777 | unsigned int clipoffset, offset; |
| 778 | |
| 779 | m = pcm_params_get_mask(params, PCM_PARAM_ACCESS); |
| 780 | offset = pcm_mask_to_string(m, string, size, |
| 781 | "Access", access_lookup, ARRAY_SIZE(access_lookup)); |
| 782 | m = pcm_params_get_mask(params, PCM_PARAM_FORMAT); |
| 783 | clipoffset = offset > size ? size : offset; |
| 784 | offset += pcm_mask_to_string(m, string + clipoffset, size - clipoffset, |
| 785 | "Format", format_lookup, ARRAY_SIZE(format_lookup)); |
| 786 | m = pcm_params_get_mask(params, PCM_PARAM_SUBFORMAT); |
| 787 | clipoffset = offset > size ? size : offset; |
| 788 | offset += pcm_mask_to_string(m, string + clipoffset, size - clipoffset, |
| 789 | "Subformat", subformat_lookup, ARRAY_SIZE(subformat_lookup)); |
| 790 | min = pcm_params_get_min(params, PCM_PARAM_RATE); |
| 791 | max = pcm_params_get_max(params, PCM_PARAM_RATE); |
| 792 | STRLOG(string, offset, size, " Rate:\tmin=%uHz\tmax=%uHz\n", min, max); |
| 793 | min = pcm_params_get_min(params, PCM_PARAM_CHANNELS); |
| 794 | max = pcm_params_get_max(params, PCM_PARAM_CHANNELS); |
| 795 | STRLOG(string, offset, size, " Channels:\tmin=%u\t\tmax=%u\n", min, max); |
| 796 | min = pcm_params_get_min(params, PCM_PARAM_SAMPLE_BITS); |
| 797 | max = pcm_params_get_max(params, PCM_PARAM_SAMPLE_BITS); |
| 798 | STRLOG(string, offset, size, " Sample bits:\tmin=%u\t\tmax=%u\n", min, max); |
| 799 | min = pcm_params_get_min(params, PCM_PARAM_PERIOD_SIZE); |
| 800 | max = pcm_params_get_max(params, PCM_PARAM_PERIOD_SIZE); |
| 801 | STRLOG(string, offset, size, " Period size:\tmin=%u\t\tmax=%u\n", min, max); |
| 802 | min = pcm_params_get_min(params, PCM_PARAM_PERIODS); |
| 803 | max = pcm_params_get_max(params, PCM_PARAM_PERIODS); |
| 804 | STRLOG(string, offset, size, "Period count:\tmin=%u\t\tmax=%u\n", min, max); |
| 805 | return offset; |
| 806 | } |
| 807 | |
| 808 | int pcm_params_format_test(struct pcm_params *params, enum pcm_format format) |
| 809 | { |
| 810 | unsigned int alsa_format = pcm_format_to_alsa(format); |
| 811 | |
| 812 | if (alsa_format == SNDRV_PCM_FORMAT_S16_LE && format != PCM_FORMAT_S16_LE) |
| 813 | return 0; /* caution: format not recognized is equivalent to S16_LE */ |
| 814 | return pcm_mask_test(pcm_params_get_mask(params, PCM_PARAM_FORMAT), alsa_format); |
| 815 | } |
| 816 | |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 817 | int pcm_close(struct pcm *pcm) |
| 818 | { |
| 819 | if (pcm == &bad_pcm) |
| 820 | return 0; |
| 821 | |
Simon Wilson | dd88f13 | 2011-07-25 10:58:30 -0700 | [diff] [blame] | 822 | pcm_hw_munmap_status(pcm); |
| 823 | |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 824 | if (pcm->flags & PCM_MMAP) { |
| 825 | pcm_stop(pcm); |
| 826 | munmap(pcm->mmap_buffer, pcm_frames_to_bytes(pcm, pcm->buffer_size)); |
| 827 | } |
| 828 | |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 829 | if (pcm->fd >= 0) |
| 830 | close(pcm->fd); |
Omair Mohammed Abdullah | 7a0b995 | 2013-01-31 16:35:39 +0530 | [diff] [blame] | 831 | pcm->prepared = 0; |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 832 | pcm->running = 0; |
| 833 | pcm->buffer_size = 0; |
| 834 | pcm->fd = -1; |
Simon Wilson | dd88f13 | 2011-07-25 10:58:30 -0700 | [diff] [blame] | 835 | free(pcm); |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 836 | return 0; |
| 837 | } |
| 838 | |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 839 | struct pcm *pcm_open(unsigned int card, unsigned int device, |
| 840 | unsigned int flags, struct pcm_config *config) |
| 841 | { |
| 842 | struct pcm *pcm; |
| 843 | struct snd_pcm_info info; |
| 844 | struct snd_pcm_hw_params params; |
| 845 | struct snd_pcm_sw_params sparams; |
| 846 | char fn[256]; |
Simon Wilson | dd88f13 | 2011-07-25 10:58:30 -0700 | [diff] [blame] | 847 | int rc; |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 848 | |
| 849 | pcm = calloc(1, sizeof(struct pcm)); |
| 850 | if (!pcm || !config) |
| 851 | return &bad_pcm; /* TODO: could support default config here */ |
| 852 | |
| 853 | pcm->config = *config; |
| 854 | |
| 855 | snprintf(fn, sizeof(fn), "/dev/snd/pcmC%uD%u%c", card, device, |
| 856 | flags & PCM_IN ? 'c' : 'p'); |
| 857 | |
| 858 | pcm->flags = flags; |
| 859 | pcm->fd = open(fn, O_RDWR); |
| 860 | if (pcm->fd < 0) { |
| 861 | oops(pcm, errno, "cannot open device '%s'", fn); |
| 862 | return pcm; |
| 863 | } |
| 864 | |
| 865 | if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_INFO, &info)) { |
| 866 | oops(pcm, errno, "cannot get info"); |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 867 | goto fail_close; |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 868 | } |
| 869 | |
| 870 | param_init(¶ms); |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 871 | param_set_mask(¶ms, SNDRV_PCM_HW_PARAM_FORMAT, |
| 872 | pcm_format_to_alsa(config->format)); |
| 873 | param_set_mask(¶ms, SNDRV_PCM_HW_PARAM_SUBFORMAT, |
| 874 | SNDRV_PCM_SUBFORMAT_STD); |
| 875 | param_set_min(¶ms, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, config->period_size); |
| 876 | param_set_int(¶ms, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, |
| 877 | pcm_format_to_bits(config->format)); |
| 878 | param_set_int(¶ms, SNDRV_PCM_HW_PARAM_FRAME_BITS, |
| 879 | pcm_format_to_bits(config->format) * config->channels); |
| 880 | param_set_int(¶ms, SNDRV_PCM_HW_PARAM_CHANNELS, |
| 881 | config->channels); |
| 882 | param_set_int(¶ms, SNDRV_PCM_HW_PARAM_PERIODS, config->period_count); |
| 883 | param_set_int(¶ms, SNDRV_PCM_HW_PARAM_RATE, config->rate); |
| 884 | |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 885 | if (flags & PCM_NOIRQ) { |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 886 | if (!(flags & PCM_MMAP)) { |
| 887 | oops(pcm, -EINVAL, "noirq only currently supported with mmap()."); |
| 888 | goto fail; |
| 889 | } |
| 890 | |
| 891 | params.flags |= SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP; |
| 892 | pcm->noirq_frames_per_msec = config->rate / 1000; |
| 893 | } |
| 894 | |
| 895 | if (flags & PCM_MMAP) |
| 896 | param_set_mask(¶ms, SNDRV_PCM_HW_PARAM_ACCESS, |
Paul McLean | b25ece4 | 2014-03-21 15:27:34 -0700 | [diff] [blame] | 897 | SNDRV_PCM_ACCESS_MMAP_INTERLEAVED); |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 898 | else |
| 899 | param_set_mask(¶ms, SNDRV_PCM_HW_PARAM_ACCESS, |
Paul McLean | b25ece4 | 2014-03-21 15:27:34 -0700 | [diff] [blame] | 900 | SNDRV_PCM_ACCESS_RW_INTERLEAVED); |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 901 | |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 902 | if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_HW_PARAMS, ¶ms)) { |
| 903 | oops(pcm, errno, "cannot set hw params"); |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 904 | goto fail_close; |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 905 | } |
| 906 | |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 907 | /* get our refined hw_params */ |
| 908 | config->period_size = param_get_int(¶ms, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); |
| 909 | config->period_count = param_get_int(¶ms, SNDRV_PCM_HW_PARAM_PERIODS); |
| 910 | pcm->buffer_size = config->period_count * config->period_size; |
| 911 | |
| 912 | if (flags & PCM_MMAP) { |
| 913 | pcm->mmap_buffer = mmap(NULL, pcm_frames_to_bytes(pcm, pcm->buffer_size), |
| 914 | PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, pcm->fd, 0); |
| 915 | if (pcm->mmap_buffer == MAP_FAILED) { |
| 916 | oops(pcm, -errno, "failed to mmap buffer %d bytes\n", |
| 917 | pcm_frames_to_bytes(pcm, pcm->buffer_size)); |
| 918 | goto fail_close; |
| 919 | } |
| 920 | } |
| 921 | |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 922 | memset(&sparams, 0, sizeof(sparams)); |
Simon Wilson | dd88f13 | 2011-07-25 10:58:30 -0700 | [diff] [blame] | 923 | sparams.tstamp_mode = SNDRV_PCM_TSTAMP_ENABLE; |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 924 | sparams.period_step = 1; |
Simon Wilson | c123962 | 2011-07-27 15:08:34 -0700 | [diff] [blame] | 925 | |
Eric Laurent | ff2e542 | 2012-08-22 16:18:14 -0700 | [diff] [blame] | 926 | if (!config->start_threshold) { |
| 927 | if (pcm->flags & PCM_IN) |
| 928 | pcm->config.start_threshold = sparams.start_threshold = 1; |
| 929 | else |
| 930 | pcm->config.start_threshold = sparams.start_threshold = |
| 931 | config->period_count * config->period_size / 2; |
| 932 | } else |
Simon Wilson | c123962 | 2011-07-27 15:08:34 -0700 | [diff] [blame] | 933 | sparams.start_threshold = config->start_threshold; |
| 934 | |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 935 | /* pick a high stop threshold - todo: does this need further tuning */ |
Eric Laurent | 1b32ddf | 2012-01-30 11:31:56 -0800 | [diff] [blame] | 936 | if (!config->stop_threshold) { |
| 937 | if (pcm->flags & PCM_IN) |
| 938 | pcm->config.stop_threshold = sparams.stop_threshold = |
| 939 | config->period_count * config->period_size * 10; |
| 940 | else |
| 941 | pcm->config.stop_threshold = sparams.stop_threshold = |
| 942 | config->period_count * config->period_size; |
| 943 | } |
Simon Wilson | c123962 | 2011-07-27 15:08:34 -0700 | [diff] [blame] | 944 | else |
| 945 | sparams.stop_threshold = config->stop_threshold; |
| 946 | |
Eric Laurent | 73b9c67 | 2011-10-14 11:12:24 -0700 | [diff] [blame] | 947 | if (!pcm->config.avail_min) { |
| 948 | if (pcm->flags & PCM_MMAP) |
| 949 | pcm->config.avail_min = sparams.avail_min = pcm->config.period_size; |
| 950 | else |
| 951 | pcm->config.avail_min = sparams.avail_min = 1; |
| 952 | } else |
| 953 | sparams.avail_min = config->avail_min; |
| 954 | |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 955 | sparams.xfer_align = config->period_size / 2; /* needed for old kernels */ |
| 956 | sparams.silence_size = 0; |
Simon Wilson | c123962 | 2011-07-27 15:08:34 -0700 | [diff] [blame] | 957 | sparams.silence_threshold = config->silence_threshold; |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 958 | pcm->boundary = sparams.boundary = pcm->buffer_size; |
Simon Wilson | c123962 | 2011-07-27 15:08:34 -0700 | [diff] [blame] | 959 | |
Simon Wilson | daa8329 | 2012-02-28 15:26:02 -0800 | [diff] [blame] | 960 | while (pcm->boundary * 2 <= INT_MAX - pcm->buffer_size) |
Paul McLean | b25ece4 | 2014-03-21 15:27:34 -0700 | [diff] [blame] | 961 | pcm->boundary *= 2; |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 962 | |
| 963 | if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_SW_PARAMS, &sparams)) { |
| 964 | oops(pcm, errno, "cannot set sw params"); |
| 965 | goto fail; |
| 966 | } |
| 967 | |
Simon Wilson | dd88f13 | 2011-07-25 10:58:30 -0700 | [diff] [blame] | 968 | rc = pcm_hw_mmap_status(pcm); |
| 969 | if (rc < 0) { |
| 970 | oops(pcm, rc, "mmap status failed"); |
| 971 | goto fail; |
| 972 | } |
| 973 | |
Glenn Kasten | 6b0a206 | 2013-08-22 15:11:48 -0700 | [diff] [blame] | 974 | #ifdef SNDRV_PCM_IOCTL_TTSTAMP |
| 975 | if (pcm->flags & PCM_MONOTONIC) { |
| 976 | int arg = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC; |
| 977 | rc = ioctl(pcm->fd, SNDRV_PCM_IOCTL_TTSTAMP, &arg); |
| 978 | if (rc < 0) { |
| 979 | oops(pcm, rc, "cannot set timestamp type"); |
| 980 | goto fail; |
| 981 | } |
| 982 | } |
| 983 | #endif |
| 984 | |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 985 | pcm->underruns = 0; |
| 986 | return pcm; |
| 987 | |
| 988 | fail: |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 989 | if (flags & PCM_MMAP) |
| 990 | munmap(pcm->mmap_buffer, pcm_frames_to_bytes(pcm, pcm->buffer_size)); |
| 991 | fail_close: |
Simon Wilson | edff708 | 2011-06-06 15:33:34 -0700 | [diff] [blame] | 992 | close(pcm->fd); |
| 993 | pcm->fd = -1; |
| 994 | return pcm; |
| 995 | } |
| 996 | |
| 997 | int pcm_is_ready(struct pcm *pcm) |
| 998 | { |
| 999 | return pcm->fd >= 0; |
| 1000 | } |
Simon Wilson | 70d7708 | 2011-06-24 11:08:10 -0700 | [diff] [blame] | 1001 | |
Omair Mohammed Abdullah | 7a0b995 | 2013-01-31 16:35:39 +0530 | [diff] [blame] | 1002 | int pcm_prepare(struct pcm *pcm) |
Simon Wilson | 70d7708 | 2011-06-24 11:08:10 -0700 | [diff] [blame] | 1003 | { |
Omair Mohammed Abdullah | 7a0b995 | 2013-01-31 16:35:39 +0530 | [diff] [blame] | 1004 | if (pcm->prepared) |
| 1005 | return 0; |
| 1006 | |
Simon Wilson | 70d7708 | 2011-06-24 11:08:10 -0700 | [diff] [blame] | 1007 | if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_PREPARE) < 0) |
| 1008 | return oops(pcm, errno, "cannot prepare channel"); |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 1009 | |
Omair Mohammed Abdullah | 7a0b995 | 2013-01-31 16:35:39 +0530 | [diff] [blame] | 1010 | pcm->prepared = 1; |
| 1011 | return 0; |
| 1012 | } |
| 1013 | |
| 1014 | int pcm_start(struct pcm *pcm) |
| 1015 | { |
| 1016 | int prepare_error = pcm_prepare(pcm); |
| 1017 | if (prepare_error) |
| 1018 | return prepare_error; |
| 1019 | |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 1020 | if (pcm->flags & PCM_MMAP) |
| 1021 | pcm_sync_ptr(pcm, 0); |
| 1022 | |
Simon Wilson | 70d7708 | 2011-06-24 11:08:10 -0700 | [diff] [blame] | 1023 | if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_START) < 0) |
| 1024 | return oops(pcm, errno, "cannot start channel"); |
| 1025 | |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 1026 | pcm->running = 1; |
Simon Wilson | 70d7708 | 2011-06-24 11:08:10 -0700 | [diff] [blame] | 1027 | return 0; |
| 1028 | } |
| 1029 | |
| 1030 | int pcm_stop(struct pcm *pcm) |
| 1031 | { |
| 1032 | if (ioctl(pcm->fd, SNDRV_PCM_IOCTL_DROP) < 0) |
| 1033 | return oops(pcm, errno, "cannot stop channel"); |
| 1034 | |
Omair Mohammed Abdullah | 7a0b995 | 2013-01-31 16:35:39 +0530 | [diff] [blame] | 1035 | pcm->prepared = 0; |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 1036 | pcm->running = 0; |
Simon Wilson | 70d7708 | 2011-06-24 11:08:10 -0700 | [diff] [blame] | 1037 | return 0; |
| 1038 | } |
| 1039 | |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 1040 | static inline int pcm_mmap_playback_avail(struct pcm *pcm) |
| 1041 | { |
| 1042 | int avail; |
| 1043 | |
| 1044 | avail = pcm->mmap_status->hw_ptr + pcm->buffer_size - pcm->mmap_control->appl_ptr; |
| 1045 | |
| 1046 | if (avail < 0) |
| 1047 | avail += pcm->boundary; |
| 1048 | else if (avail > (int)pcm->boundary) |
| 1049 | avail -= pcm->boundary; |
| 1050 | |
| 1051 | return avail; |
| 1052 | } |
| 1053 | |
| 1054 | static inline int pcm_mmap_capture_avail(struct pcm *pcm) |
| 1055 | { |
| 1056 | int avail = pcm->mmap_status->hw_ptr - pcm->mmap_control->appl_ptr; |
| 1057 | if (avail < 0) |
| 1058 | avail += pcm->boundary; |
| 1059 | return avail; |
| 1060 | } |
| 1061 | |
| 1062 | static inline int pcm_mmap_avail(struct pcm *pcm) |
| 1063 | { |
| 1064 | pcm_sync_ptr(pcm, SNDRV_PCM_SYNC_PTR_HWSYNC); |
| 1065 | if (pcm->flags & PCM_IN) |
| 1066 | return pcm_mmap_capture_avail(pcm); |
| 1067 | else |
| 1068 | return pcm_mmap_playback_avail(pcm); |
| 1069 | } |
| 1070 | |
| 1071 | static void pcm_mmap_appl_forward(struct pcm *pcm, int frames) |
| 1072 | { |
| 1073 | unsigned int appl_ptr = pcm->mmap_control->appl_ptr; |
| 1074 | appl_ptr += frames; |
| 1075 | |
| 1076 | /* check for boundary wrap */ |
| 1077 | if (appl_ptr > pcm->boundary) |
| 1078 | appl_ptr -= pcm->boundary; |
| 1079 | pcm->mmap_control->appl_ptr = appl_ptr; |
| 1080 | } |
| 1081 | |
| 1082 | int pcm_mmap_begin(struct pcm *pcm, void **areas, unsigned int *offset, |
| 1083 | unsigned int *frames) |
| 1084 | { |
| 1085 | unsigned int continuous, copy_frames, avail; |
| 1086 | |
| 1087 | /* return the mmap buffer */ |
| 1088 | *areas = pcm->mmap_buffer; |
| 1089 | |
| 1090 | /* and the application offset in frames */ |
| 1091 | *offset = pcm->mmap_control->appl_ptr % pcm->buffer_size; |
| 1092 | |
| 1093 | avail = pcm_mmap_avail(pcm); |
| 1094 | if (avail > pcm->buffer_size) |
| 1095 | avail = pcm->buffer_size; |
| 1096 | continuous = pcm->buffer_size - *offset; |
| 1097 | |
| 1098 | /* we can only copy frames if the are availabale and continuos */ |
| 1099 | copy_frames = *frames; |
| 1100 | if (copy_frames > avail) |
| 1101 | copy_frames = avail; |
| 1102 | if (copy_frames > continuous) |
| 1103 | copy_frames = continuous; |
| 1104 | *frames = copy_frames; |
| 1105 | |
| 1106 | return 0; |
| 1107 | } |
| 1108 | |
| 1109 | int pcm_mmap_commit(struct pcm *pcm, unsigned int offset, unsigned int frames) |
| 1110 | { |
| 1111 | /* update the application pointer in userspace and kernel */ |
| 1112 | pcm_mmap_appl_forward(pcm, frames); |
| 1113 | pcm_sync_ptr(pcm, 0); |
| 1114 | |
| 1115 | return frames; |
| 1116 | } |
| 1117 | |
| 1118 | int pcm_avail_update(struct pcm *pcm) |
| 1119 | { |
| 1120 | pcm_sync_ptr(pcm, 0); |
| 1121 | return pcm_mmap_avail(pcm); |
| 1122 | } |
| 1123 | |
| 1124 | int pcm_state(struct pcm *pcm) |
| 1125 | { |
| 1126 | int err = pcm_sync_ptr(pcm, 0); |
| 1127 | if (err < 0) |
| 1128 | return err; |
| 1129 | |
| 1130 | return pcm->mmap_status->state; |
| 1131 | } |
| 1132 | |
Eric Laurent | 73b9c67 | 2011-10-14 11:12:24 -0700 | [diff] [blame] | 1133 | int pcm_set_avail_min(struct pcm *pcm, int avail_min) |
| 1134 | { |
| 1135 | if ((~pcm->flags) & (PCM_MMAP | PCM_NOIRQ)) |
| 1136 | return -ENOSYS; |
| 1137 | |
| 1138 | pcm->config.avail_min = avail_min; |
| 1139 | return 0; |
| 1140 | } |
| 1141 | |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 1142 | int pcm_wait(struct pcm *pcm, int timeout) |
| 1143 | { |
| 1144 | struct pollfd pfd; |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 1145 | int err; |
| 1146 | |
| 1147 | pfd.fd = pcm->fd; |
| 1148 | pfd.events = POLLOUT | POLLERR | POLLNVAL; |
| 1149 | |
| 1150 | do { |
| 1151 | /* let's wait for avail or timeout */ |
| 1152 | err = poll(&pfd, 1, timeout); |
| 1153 | if (err < 0) |
| 1154 | return -errno; |
| 1155 | |
| 1156 | /* timeout ? */ |
| 1157 | if (err == 0) |
| 1158 | return 0; |
| 1159 | |
| 1160 | /* have we been interrupted ? */ |
| 1161 | if (errno == -EINTR) |
| 1162 | continue; |
| 1163 | |
| 1164 | /* check for any errors */ |
| 1165 | if (pfd.revents & (POLLERR | POLLNVAL)) { |
| 1166 | switch (pcm_state(pcm)) { |
| 1167 | case PCM_STATE_XRUN: |
| 1168 | return -EPIPE; |
| 1169 | case PCM_STATE_SUSPENDED: |
| 1170 | return -ESTRPIPE; |
| 1171 | case PCM_STATE_DISCONNECTED: |
| 1172 | return -ENODEV; |
| 1173 | default: |
| 1174 | return -EIO; |
| 1175 | } |
| 1176 | } |
| 1177 | /* poll again if fd not ready for IO */ |
| 1178 | } while (!(pfd.revents & (POLLIN | POLLOUT))); |
| 1179 | |
| 1180 | return 1; |
| 1181 | } |
| 1182 | |
Eric Laurent | c98da79 | 2013-09-16 14:31:17 -0700 | [diff] [blame] | 1183 | int pcm_mmap_transfer(struct pcm *pcm, const void *buffer, unsigned int bytes) |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 1184 | { |
| 1185 | int err = 0, frames, avail; |
| 1186 | unsigned int offset = 0, count; |
| 1187 | |
| 1188 | if (bytes == 0) |
| 1189 | return 0; |
| 1190 | |
| 1191 | count = pcm_bytes_to_frames(pcm, bytes); |
| 1192 | |
| 1193 | while (count > 0) { |
| 1194 | |
| 1195 | /* get the available space for writing new frames */ |
| 1196 | avail = pcm_avail_update(pcm); |
| 1197 | if (avail < 0) { |
| 1198 | fprintf(stderr, "cannot determine available mmap frames"); |
| 1199 | return err; |
| 1200 | } |
| 1201 | |
| 1202 | /* start the audio if we reach the threshold */ |
| 1203 | if (!pcm->running && |
| 1204 | (pcm->buffer_size - avail) >= pcm->config.start_threshold) { |
| 1205 | if (pcm_start(pcm) < 0) { |
| 1206 | fprintf(stderr, "start error: hw 0x%x app 0x%x avail 0x%x\n", |
| 1207 | (unsigned int)pcm->mmap_status->hw_ptr, |
| 1208 | (unsigned int)pcm->mmap_control->appl_ptr, |
| 1209 | avail); |
| 1210 | return -errno; |
| 1211 | } |
Eric Laurent | 73b9c67 | 2011-10-14 11:12:24 -0700 | [diff] [blame] | 1212 | pcm->wait_for_avail_min = 0; |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 1213 | } |
| 1214 | |
| 1215 | /* sleep until we have space to write new frames */ |
Eric Laurent | 73b9c67 | 2011-10-14 11:12:24 -0700 | [diff] [blame] | 1216 | if (pcm->running) { |
| 1217 | /* enable waiting for avail_min threshold when less frames than we have to write |
| 1218 | * are available. */ |
| 1219 | if (!pcm->wait_for_avail_min && (count > (unsigned int)avail)) |
| 1220 | pcm->wait_for_avail_min = 1; |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 1221 | |
Eric Laurent | 73b9c67 | 2011-10-14 11:12:24 -0700 | [diff] [blame] | 1222 | if (pcm->wait_for_avail_min && (avail < pcm->config.avail_min)) { |
| 1223 | int time = -1; |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 1224 | |
Eric Laurent | 73b9c67 | 2011-10-14 11:12:24 -0700 | [diff] [blame] | 1225 | /* disable waiting for avail_min threshold to allow small amounts of data to be |
| 1226 | * written without waiting as long as there is enough room in buffer. */ |
| 1227 | pcm->wait_for_avail_min = 0; |
| 1228 | |
| 1229 | if (pcm->flags & PCM_NOIRQ) |
| 1230 | time = (pcm->config.avail_min - avail) / pcm->noirq_frames_per_msec; |
| 1231 | |
| 1232 | err = pcm_wait(pcm, time); |
| 1233 | if (err < 0) { |
Omair Mohammed Abdullah | 7a0b995 | 2013-01-31 16:35:39 +0530 | [diff] [blame] | 1234 | pcm->prepared = 0; |
Eric Laurent | 73b9c67 | 2011-10-14 11:12:24 -0700 | [diff] [blame] | 1235 | pcm->running = 0; |
| 1236 | oops(pcm, err, "wait error: hw 0x%x app 0x%x avail 0x%x\n", |
| 1237 | (unsigned int)pcm->mmap_status->hw_ptr, |
| 1238 | (unsigned int)pcm->mmap_control->appl_ptr, |
| 1239 | avail); |
| 1240 | pcm->mmap_control->appl_ptr = 0; |
| 1241 | return err; |
| 1242 | } |
| 1243 | continue; |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 1244 | } |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 1245 | } |
| 1246 | |
| 1247 | frames = count; |
| 1248 | if (frames > avail) |
| 1249 | frames = avail; |
| 1250 | |
| 1251 | if (!frames) |
| 1252 | break; |
| 1253 | |
| 1254 | /* copy frames from buffer */ |
Eric Laurent | c98da79 | 2013-09-16 14:31:17 -0700 | [diff] [blame] | 1255 | frames = pcm_mmap_transfer_areas(pcm, (void *)buffer, offset, frames); |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 1256 | if (frames < 0) { |
| 1257 | fprintf(stderr, "write error: hw 0x%x app 0x%x avail 0x%x\n", |
| 1258 | (unsigned int)pcm->mmap_status->hw_ptr, |
| 1259 | (unsigned int)pcm->mmap_control->appl_ptr, |
| 1260 | avail); |
| 1261 | return frames; |
| 1262 | } |
| 1263 | |
| 1264 | offset += frames; |
| 1265 | count -= frames; |
| 1266 | } |
| 1267 | |
Simon Wilson | e9942c8 | 2011-10-13 13:57:25 -0700 | [diff] [blame] | 1268 | return 0; |
| 1269 | } |
Eric Laurent | c98da79 | 2013-09-16 14:31:17 -0700 | [diff] [blame] | 1270 | |
| 1271 | int pcm_mmap_write(struct pcm *pcm, const void *data, unsigned int count) |
| 1272 | { |
| 1273 | if ((~pcm->flags) & (PCM_OUT | PCM_MMAP)) |
| 1274 | return -ENOSYS; |
| 1275 | |
| 1276 | return pcm_mmap_transfer(pcm, (void *)data, count); |
| 1277 | } |
| 1278 | |
| 1279 | int pcm_mmap_read(struct pcm *pcm, void *data, unsigned int count) |
| 1280 | { |
| 1281 | if ((~pcm->flags) & (PCM_IN | PCM_MMAP)) |
| 1282 | return -ENOSYS; |
| 1283 | |
| 1284 | return pcm_mmap_transfer(pcm, data, count); |
| 1285 | } |
Shiv Maliyappanahalli | 892d6a5 | 2014-05-23 15:20:13 -0700 | [diff] [blame] | 1286 | |
| 1287 | int pcm_ioctl(struct pcm *pcm, int request, ...) |
| 1288 | { |
| 1289 | va_list ap; |
| 1290 | void * arg; |
| 1291 | |
| 1292 | if (!pcm_is_ready(pcm)) |
| 1293 | return -1; |
| 1294 | |
| 1295 | va_start(ap, request); |
| 1296 | arg = va_arg(ap, void *); |
| 1297 | va_end(ap); |
| 1298 | |
| 1299 | return ioctl(pcm->fd, request, arg); |
| 1300 | } |