1 /* Copyright (c) 2013 The Chromium OS Authors. All rights reserved. 2 * Use of this source code is governed by a BSD-style license that can be 3 * found in the LICENSE file. 4 */ 5 6 #include <pthread.h> 7 #include <sys/param.h> 8 #include <syslog.h> 9 10 #include "byte_buffer.h" 11 #include "cras_audio_area.h" 12 #include "cras_config.h" 13 #include "cras_iodev.h" 14 #include "cras_iodev_list.h" 15 #include "cras_types.h" 16 #include "cras_util.h" 17 #include "sfh.h" 18 #include "utlist.h" 19 20 #define LOOPBACK_BUFFER_SIZE 8192 21 22 static const char *loopdev_names[LOOPBACK_NUM_TYPES] = { 23 "Post Mix Pre DSP Loopback", 24 "Post DSP Loopback", 25 }; 26 27 static size_t loopback_supported_rates[] = { 28 48000, 0 29 }; 30 31 static size_t loopback_supported_channel_counts[] = { 32 2, 0 33 }; 34 35 static snd_pcm_format_t loopback_supported_formats[] = { 36 SND_PCM_FORMAT_S16_LE, 37 0 38 }; 39 40 /* loopack iodev. Keep state of a loopback device. 41 * sample_buffer - Pointer to sample buffer. 42 */ 43 struct loopback_iodev { 44 struct cras_iodev base; 45 enum CRAS_LOOPBACK_TYPE loopback_type; 46 struct timespec last_filled; 47 struct byte_buffer *sample_buffer; 48 }; 49 50 static int sample_hook(const uint8_t *frames, unsigned int nframes, 51 const struct cras_audio_format *fmt, 52 void *cb_data) 53 { 54 struct loopback_iodev *loopdev = (struct loopback_iodev *)cb_data; 55 struct byte_buffer *sbuf = loopdev->sample_buffer; 56 unsigned int frame_bytes = cras_get_format_bytes(fmt); 57 unsigned int frames_to_copy, bytes_to_copy; 58 struct cras_iodev *edev = cras_iodev_list_get_first_enabled_iodev( 59 CRAS_STREAM_OUTPUT); 60 61 /* If there's no active streams, the logic in frames_queued will fill 62 * zeros for loopback capture, do not accept zeros for draining device. 63 */ 64 if (!edev || !edev->streams) 65 return 0; 66 67 frames_to_copy = MIN(buf_writable_bytes(sbuf) / frame_bytes, nframes); 68 if (!frames_to_copy) 69 return 0; 70 71 bytes_to_copy = frames_to_copy * frame_bytes; 72 memcpy(buf_write_pointer(sbuf), frames, bytes_to_copy); 73 buf_increment_write(sbuf, bytes_to_copy); 74 clock_gettime(CLOCK_MONOTONIC_RAW, &loopdev->last_filled); 75 76 return frames_to_copy; 77 } 78 79 static void register_loopback_hook(enum CRAS_LOOPBACK_TYPE loopback_type, 80 struct cras_iodev *iodev, 81 loopback_hook_t hook, void *cb_data) 82 { 83 if (!iodev) { 84 syslog(LOG_ERR, "Failed to register loopback hook."); 85 return; 86 } 87 88 if (loopback_type == LOOPBACK_POST_MIX_PRE_DSP) 89 cras_iodev_register_pre_dsp_hook(iodev, hook, cb_data); 90 else if (loopback_type == LOOPBACK_POST_DSP) 91 cras_iodev_register_post_dsp_hook(iodev, hook, cb_data); 92 } 93 94 static void device_enabled_hook(struct cras_iodev *iodev, int enabled, 95 void *cb_data) 96 { 97 struct loopback_iodev *loopdev = (struct loopback_iodev *)cb_data; 98 struct cras_iodev *edev; 99 100 if (iodev->direction != CRAS_STREAM_OUTPUT) 101 return; 102 103 if (!enabled) { 104 /* Unregister loopback hook from disabled iodev. */ 105 register_loopback_hook(loopdev->loopback_type, iodev, NULL, 106 NULL); 107 } else { 108 /* Register loopback hook onto first enabled iodev. */ 109 edev = cras_iodev_list_get_first_enabled_iodev( 110 CRAS_STREAM_OUTPUT); 111 register_loopback_hook(loopdev->loopback_type, edev, 112 sample_hook, cb_data); 113 } 114 } 115 116 /* 117 * iodev callbacks. 118 */ 119 120 static int frames_queued(const struct cras_iodev *iodev, 121 struct timespec *hw_tstamp) 122 { 123 struct loopback_iodev *loopdev = (struct loopback_iodev *)iodev; 124 struct byte_buffer *sbuf = loopdev->sample_buffer; 125 unsigned int frame_bytes = cras_get_format_bytes(iodev->format); 126 struct cras_iodev *edev = cras_iodev_list_get_first_enabled_iodev( 127 CRAS_STREAM_OUTPUT); 128 129 if (!edev || !edev->streams) { 130 unsigned int frames_since_last, frames_to_fill, bytes_to_fill; 131 132 frames_since_last = cras_frames_since_time( 133 &loopdev->last_filled, 134 iodev->format->frame_rate); 135 frames_to_fill = MIN(buf_writable_bytes(sbuf) / frame_bytes, 136 frames_since_last); 137 if (frames_to_fill > 0) { 138 bytes_to_fill = frames_to_fill * frame_bytes; 139 memset(buf_write_pointer(sbuf), 0, bytes_to_fill); 140 buf_increment_write(sbuf, bytes_to_fill); 141 clock_gettime(CLOCK_MONOTONIC_RAW, 142 &loopdev->last_filled); 143 } 144 } 145 *hw_tstamp = loopdev->last_filled; 146 return buf_queued_bytes(sbuf) / frame_bytes; 147 } 148 149 static int delay_frames(const struct cras_iodev *iodev) 150 { 151 struct timespec tstamp; 152 153 return frames_queued(iodev, &tstamp); 154 } 155 156 static int close_record_dev(struct cras_iodev *iodev) 157 { 158 struct loopback_iodev *loopdev = (struct loopback_iodev *)iodev; 159 struct byte_buffer *sbuf = loopdev->sample_buffer; 160 struct cras_iodev *edev; 161 162 cras_iodev_free_format(iodev); 163 cras_iodev_free_audio_area(iodev); 164 buf_reset(sbuf); 165 166 edev = cras_iodev_list_get_first_enabled_iodev(CRAS_STREAM_OUTPUT); 167 register_loopback_hook(loopdev->loopback_type, edev, NULL, NULL); 168 cras_iodev_list_set_device_enabled_callback(NULL, NULL); 169 170 return 0; 171 } 172 173 static int open_record_dev(struct cras_iodev *iodev) 174 { 175 struct loopback_iodev *loopdev = (struct loopback_iodev *)iodev; 176 struct cras_iodev *edev; 177 178 cras_iodev_init_audio_area(iodev, iodev->format->num_channels); 179 clock_gettime(CLOCK_MONOTONIC_RAW, &loopdev->last_filled); 180 181 edev = cras_iodev_list_get_first_enabled_iodev(CRAS_STREAM_OUTPUT); 182 register_loopback_hook(loopdev->loopback_type, edev, sample_hook, 183 (void *)iodev); 184 cras_iodev_list_set_device_enabled_callback(device_enabled_hook, 185 (void *)iodev); 186 187 return 0; 188 } 189 190 static int get_record_buffer(struct cras_iodev *iodev, 191 struct cras_audio_area **area, 192 unsigned *frames) 193 { 194 struct loopback_iodev *loopdev = (struct loopback_iodev *)iodev; 195 struct byte_buffer *sbuf = loopdev->sample_buffer; 196 unsigned int frame_bytes = cras_get_format_bytes(iodev->format); 197 unsigned int avail_frames = buf_readable_bytes(sbuf) / frame_bytes; 198 199 *frames = MIN(avail_frames, *frames); 200 iodev->area->frames = *frames; 201 cras_audio_area_config_buf_pointers(iodev->area, iodev->format, 202 buf_read_pointer(sbuf)); 203 *area = iodev->area; 204 205 return 0; 206 } 207 208 static int put_record_buffer(struct cras_iodev *iodev, unsigned nframes) 209 { 210 struct loopback_iodev *loopdev = (struct loopback_iodev *)iodev; 211 struct byte_buffer *sbuf = loopdev->sample_buffer; 212 unsigned int frame_bytes = cras_get_format_bytes(iodev->format); 213 214 buf_increment_read(sbuf, nframes * frame_bytes); 215 216 return 0; 217 } 218 219 static int flush_record_buffer(struct cras_iodev *iodev) 220 { 221 struct loopback_iodev *loopdev = (struct loopback_iodev *)iodev; 222 struct byte_buffer *sbuf = loopdev->sample_buffer; 223 unsigned int queued_bytes = buf_queued_bytes(sbuf); 224 buf_increment_read(sbuf, queued_bytes); 225 return 0; 226 } 227 228 static void update_active_node(struct cras_iodev *iodev, unsigned node_idx, 229 unsigned dev_enabled) 230 { 231 } 232 233 static struct cras_iodev *create_loopback_iodev(enum CRAS_LOOPBACK_TYPE type) 234 { 235 struct loopback_iodev *loopback_iodev; 236 struct cras_iodev *iodev; 237 238 loopback_iodev = calloc(1, sizeof(*loopback_iodev)); 239 if (loopback_iodev == NULL) 240 return NULL; 241 242 loopback_iodev->sample_buffer = byte_buffer_create(1024*16*4); 243 if (loopback_iodev->sample_buffer == NULL) { 244 free(loopback_iodev); 245 return NULL; 246 } 247 248 loopback_iodev->loopback_type = type; 249 250 iodev = &loopback_iodev->base; 251 iodev->direction = CRAS_STREAM_INPUT; 252 snprintf(iodev->info.name, ARRAY_SIZE(iodev->info.name), "%s", 253 loopdev_names[type]); 254 iodev->info.name[ARRAY_SIZE(iodev->info.name) - 1] = '\0'; 255 iodev->info.stable_id = SuperFastHash(iodev->info.name, 256 strlen(iodev->info.name), 257 strlen(iodev->info.name)); 258 iodev->info.stable_id_new = iodev->info.stable_id; 259 260 iodev->supported_rates = loopback_supported_rates; 261 iodev->supported_channel_counts = loopback_supported_channel_counts; 262 iodev->supported_formats = loopback_supported_formats; 263 iodev->buffer_size = LOOPBACK_BUFFER_SIZE; 264 265 iodev->frames_queued = frames_queued; 266 iodev->delay_frames = delay_frames; 267 iodev->update_active_node = update_active_node; 268 iodev->open_dev = open_record_dev; 269 iodev->close_dev = close_record_dev; 270 iodev->get_buffer = get_record_buffer; 271 iodev->put_buffer = put_record_buffer; 272 iodev->flush_buffer = flush_record_buffer; 273 274 return iodev; 275 } 276 277 /* 278 * Exported Interface. 279 */ 280 281 struct cras_iodev *loopback_iodev_create(enum CRAS_LOOPBACK_TYPE type) 282 { 283 struct cras_iodev *iodev; 284 struct cras_ionode *node; 285 enum CRAS_NODE_TYPE node_type; 286 287 switch (type) { 288 case LOOPBACK_POST_MIX_PRE_DSP: 289 node_type = CRAS_NODE_TYPE_POST_MIX_PRE_DSP; 290 break; 291 case LOOPBACK_POST_DSP: 292 node_type = CRAS_NODE_TYPE_POST_DSP; 293 break; 294 default: 295 return NULL; 296 } 297 298 iodev = create_loopback_iodev(type); 299 if (iodev == NULL) 300 return NULL; 301 302 /* Create a dummy ionode */ 303 node = (struct cras_ionode *)calloc(1, sizeof(*node)); 304 node->dev = iodev; 305 node->type = node_type; 306 node->plugged = 1; 307 node->volume = 100; 308 node->stable_id = iodev->info.stable_id; 309 node->stable_id_new = iodev->info.stable_id_new; 310 node->software_volume_needed = 0; 311 node->max_software_gain = 0; 312 strcpy(node->name, loopdev_names[type]); 313 cras_iodev_add_node(iodev, node); 314 cras_iodev_set_active_node(iodev, node); 315 316 cras_iodev_list_add_input(iodev); 317 318 return iodev; 319 } 320 321 void loopback_iodev_destroy(struct cras_iodev *iodev) 322 { 323 struct loopback_iodev *loopdev = (struct loopback_iodev *)iodev; 324 struct byte_buffer *sbuf = loopdev->sample_buffer; 325 326 cras_iodev_list_rm_input(iodev); 327 328 byte_buffer_destroy(sbuf); 329 free(loopdev); 330 } 331
