Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #define LOG_TAG "alsa_device_proxy" |
Paul Mclean | 2a3925e | 2016-06-02 14:48:10 +0000 | [diff] [blame] | 18 | /*#define LOG_NDEBUG 0*/ |
Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 19 | /*#define LOG_PCM_PARAMS 0*/ |
| 20 | |
| 21 | #include <log/log.h> |
| 22 | |
| 23 | #include <errno.h> |
Tri Vo | 82d9450 | 2017-06-23 15:42:32 -0700 | [diff] [blame] | 24 | #include <stdio.h> |
Dan Albert | d8ec6c2 | 2017-10-11 12:26:23 -0700 | [diff] [blame] | 25 | #include <string.h> |
Tri Vo | 82d9450 | 2017-06-23 15:42:32 -0700 | [diff] [blame] | 26 | |
Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 27 | #include "include/alsa_device_proxy.h" |
| 28 | |
| 29 | #include "include/alsa_logging.h" |
| 30 | |
| 31 | #define DEFAULT_PERIOD_SIZE 1024 |
| 32 | #define DEFAULT_PERIOD_COUNT 2 |
| 33 | |
Andy Hung | 8785fe1 | 2015-08-04 14:57:50 -0700 | [diff] [blame] | 34 | #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) |
| 35 | |
| 36 | static const unsigned format_byte_size_map[] = { |
| 37 | 2, /* PCM_FORMAT_S16_LE */ |
| 38 | 4, /* PCM_FORMAT_S32_LE */ |
| 39 | 1, /* PCM_FORMAT_S8 */ |
| 40 | 4, /* PCM_FORMAT_S24_LE */ |
| 41 | 3, /* PCM_FORMAT_S24_3LE */ |
| 42 | }; |
| 43 | |
Andy Hung | 2c95978 | 2017-10-27 20:20:27 -0700 | [diff] [blame] | 44 | int proxy_prepare(alsa_device_proxy * proxy, const alsa_device_profile* profile, |
Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 45 | struct pcm_config * config) |
| 46 | { |
Eric Laurent | 49bc03c | 2017-05-03 11:33:26 -0700 | [diff] [blame] | 47 | int ret = 0; |
| 48 | |
Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 49 | ALOGV("proxy_prepare(c:%d, d:%d)", profile->card, profile->device); |
Paul Mclean | 2a3925e | 2016-06-02 14:48:10 +0000 | [diff] [blame] | 50 | |
Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 51 | proxy->profile = profile; |
| 52 | |
| 53 | #ifdef LOG_PCM_PARAMS |
| 54 | log_pcm_config(config, "proxy_setup()"); |
| 55 | #endif |
| 56 | |
Paul McLean | a70650a | 2015-11-03 12:25:24 -0800 | [diff] [blame] | 57 | if (config->format != PCM_FORMAT_INVALID && profile_is_format_valid(profile, config->format)) { |
| 58 | proxy->alsa_config.format = config->format; |
| 59 | } else { |
Eric Laurent | 49bc03c | 2017-05-03 11:33:26 -0700 | [diff] [blame] | 60 | proxy->alsa_config.format = profile->default_config.format; |
Paul McLean | a70650a | 2015-11-03 12:25:24 -0800 | [diff] [blame] | 61 | ALOGW("Invalid format %d - using default %d.", |
| 62 | config->format, profile->default_config.format); |
Eric Laurent | 49bc03c | 2017-05-03 11:33:26 -0700 | [diff] [blame] | 63 | // Indicate override when default format was not requested |
| 64 | if (config->format != PCM_FORMAT_INVALID) { |
| 65 | ret = -EINVAL; |
| 66 | } |
Paul McLean | a70650a | 2015-11-03 12:25:24 -0800 | [diff] [blame] | 67 | } |
| 68 | |
| 69 | if (config->rate != 0 && profile_is_sample_rate_valid(profile, config->rate)) { |
| 70 | proxy->alsa_config.rate = config->rate; |
| 71 | } else { |
Eric Laurent | 49bc03c | 2017-05-03 11:33:26 -0700 | [diff] [blame] | 72 | proxy->alsa_config.rate = profile->default_config.rate; |
Paul McLean | a70650a | 2015-11-03 12:25:24 -0800 | [diff] [blame] | 73 | ALOGW("Invalid sample rate %u - using default %u.", |
| 74 | config->rate, profile->default_config.rate); |
Eric Laurent | 49bc03c | 2017-05-03 11:33:26 -0700 | [diff] [blame] | 75 | // Indicate override when default rate was not requested |
| 76 | if (config->rate != 0) { |
| 77 | ret = -EINVAL; |
| 78 | } |
Paul McLean | a70650a | 2015-11-03 12:25:24 -0800 | [diff] [blame] | 79 | } |
| 80 | |
| 81 | if (config->channels != 0 && profile_is_channel_count_valid(profile, config->channels)) { |
| 82 | proxy->alsa_config.channels = config->channels; |
| 83 | } else { |
Paul McLean | eafa18a | 2016-06-10 11:47:43 -0600 | [diff] [blame] | 84 | proxy->alsa_config.channels = profile_get_closest_channel_count(profile, config->channels); |
| 85 | ALOGW("Invalid channel count %u - using closest %u.", |
| 86 | config->channels, proxy->alsa_config.channels); |
Eric Laurent | 49bc03c | 2017-05-03 11:33:26 -0700 | [diff] [blame] | 87 | // Indicate override when default channel count was not requested |
| 88 | if (config->channels != 0) { |
| 89 | ret = -EINVAL; |
| 90 | } |
Paul McLean | a70650a | 2015-11-03 12:25:24 -0800 | [diff] [blame] | 91 | } |
Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 92 | |
| 93 | proxy->alsa_config.period_count = profile->default_config.period_count; |
| 94 | proxy->alsa_config.period_size = |
| 95 | profile_get_period_size(proxy->profile, proxy->alsa_config.rate); |
| 96 | |
| 97 | // Hack for USB accessory audio. |
| 98 | // Here we set the correct value for period_count if tinyalsa fails to get it from the |
| 99 | // f_audio_source driver. |
| 100 | if (proxy->alsa_config.period_count == 0) { |
| 101 | proxy->alsa_config.period_count = 4; |
| 102 | } |
| 103 | |
| 104 | proxy->pcm = NULL; |
Andy Hung | 8785fe1 | 2015-08-04 14:57:50 -0700 | [diff] [blame] | 105 | // config format should be checked earlier against profile. |
| 106 | if (config->format >= 0 && (size_t)config->format < ARRAY_SIZE(format_byte_size_map)) { |
| 107 | proxy->frame_size = format_byte_size_map[config->format] * proxy->alsa_config.channels; |
| 108 | } else { |
| 109 | proxy->frame_size = 1; |
| 110 | } |
Paul McLean | 948a6a4 | 2017-03-08 15:06:27 -0700 | [diff] [blame] | 111 | |
| 112 | // let's check to make sure we can ACTUALLY use the maximum rate (with the channel count) |
| 113 | // Note that profile->sample_rates is sorted highest to lowest, so the scan will get |
| 114 | // us the highest working rate |
| 115 | int max_rate_index = proxy_scan_rates(proxy, profile->sample_rates); |
| 116 | if (max_rate_index >= 0) { |
Eric Laurent | 49bc03c | 2017-05-03 11:33:26 -0700 | [diff] [blame] | 117 | if (proxy->alsa_config.rate > profile->sample_rates[max_rate_index]) { |
| 118 | ALOGW("Limiting samplnig rate from %u to %u.", |
| 119 | proxy->alsa_config.rate, profile->sample_rates[max_rate_index]); |
| 120 | proxy->alsa_config.rate = profile->sample_rates[max_rate_index]; |
| 121 | ret = -EINVAL; |
| 122 | } |
Paul McLean | 948a6a4 | 2017-03-08 15:06:27 -0700 | [diff] [blame] | 123 | } |
Eric Laurent | 49bc03c | 2017-05-03 11:33:26 -0700 | [diff] [blame] | 124 | return ret; |
Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 125 | } |
| 126 | |
| 127 | int proxy_open(alsa_device_proxy * proxy) |
| 128 | { |
Andy Hung | 2c95978 | 2017-10-27 20:20:27 -0700 | [diff] [blame] | 129 | const alsa_device_profile* profile = proxy->profile; |
Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 130 | ALOGV("proxy_open(card:%d device:%d %s)", profile->card, profile->device, |
| 131 | profile->direction == PCM_OUT ? "PCM_OUT" : "PCM_IN"); |
| 132 | |
| 133 | if (profile->card < 0 || profile->device < 0) { |
| 134 | return -EINVAL; |
| 135 | } |
| 136 | |
Andy Hung | 8785fe1 | 2015-08-04 14:57:50 -0700 | [diff] [blame] | 137 | proxy->pcm = pcm_open(profile->card, profile->device, |
| 138 | profile->direction | PCM_MONOTONIC, &proxy->alsa_config); |
Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 139 | if (proxy->pcm == NULL) { |
| 140 | return -ENOMEM; |
| 141 | } |
| 142 | |
| 143 | if (!pcm_is_ready(proxy->pcm)) { |
Paul McLean | 948a6a4 | 2017-03-08 15:06:27 -0700 | [diff] [blame] | 144 | ALOGE(" proxy_open() pcm_is_ready() failed: %s", pcm_get_error(proxy->pcm)); |
Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 145 | #if defined(LOG_PCM_PARAMS) |
| 146 | log_pcm_config(&proxy->alsa_config, "config"); |
| 147 | #endif |
| 148 | pcm_close(proxy->pcm); |
| 149 | proxy->pcm = NULL; |
| 150 | return -ENOMEM; |
| 151 | } |
| 152 | |
| 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | void proxy_close(alsa_device_proxy * proxy) |
| 157 | { |
| 158 | ALOGV("proxy_close() [pcm:%p]", proxy->pcm); |
| 159 | |
| 160 | if (proxy->pcm != NULL) { |
| 161 | pcm_close(proxy->pcm); |
| 162 | proxy->pcm = NULL; |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | /* |
| 167 | * Sample Rate |
| 168 | */ |
| 169 | unsigned proxy_get_sample_rate(const alsa_device_proxy * proxy) |
| 170 | { |
| 171 | return proxy->alsa_config.rate; |
| 172 | } |
| 173 | |
| 174 | /* |
| 175 | * Format |
| 176 | */ |
| 177 | enum pcm_format proxy_get_format(const alsa_device_proxy * proxy) |
| 178 | { |
| 179 | return proxy->alsa_config.format; |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Channel Count |
| 184 | */ |
| 185 | unsigned proxy_get_channel_count(const alsa_device_proxy * proxy) |
| 186 | { |
| 187 | return proxy->alsa_config.channels; |
| 188 | } |
| 189 | |
| 190 | /* |
| 191 | * Other |
| 192 | */ |
| 193 | unsigned int proxy_get_period_size(const alsa_device_proxy * proxy) |
| 194 | { |
| 195 | return proxy->alsa_config.period_size; |
| 196 | } |
| 197 | |
| 198 | unsigned int proxy_get_period_count(const alsa_device_proxy * proxy) |
| 199 | { |
| 200 | return proxy->alsa_config.period_count; |
| 201 | } |
| 202 | |
| 203 | unsigned proxy_get_latency(const alsa_device_proxy * proxy) |
| 204 | { |
| 205 | return (proxy_get_period_size(proxy) * proxy_get_period_count(proxy) * 1000) |
| 206 | / proxy_get_sample_rate(proxy); |
| 207 | } |
| 208 | |
Andy Hung | 8785fe1 | 2015-08-04 14:57:50 -0700 | [diff] [blame] | 209 | int proxy_get_presentation_position(const alsa_device_proxy * proxy, |
| 210 | uint64_t *frames, struct timespec *timestamp) |
| 211 | { |
| 212 | int ret = -EPERM; // -1 |
| 213 | unsigned int avail; |
| 214 | if (proxy->pcm != NULL |
| 215 | && pcm_get_htimestamp(proxy->pcm, &avail, timestamp) == 0) { |
| 216 | const size_t kernel_buffer_size = |
| 217 | proxy->alsa_config.period_size * proxy->alsa_config.period_count; |
| 218 | if (avail > kernel_buffer_size) { |
| 219 | ALOGE("available frames(%u) > buffer size(%zu)", avail, kernel_buffer_size); |
| 220 | } else { |
| 221 | int64_t signed_frames = proxy->transferred - kernel_buffer_size + avail; |
| 222 | // It is possible to compensate for additional driver and device delay |
| 223 | // by changing signed_frames. Example: |
| 224 | // signed_frames -= 20 /* ms */ * proxy->alsa_config.rate / 1000; |
| 225 | if (signed_frames >= 0) { |
| 226 | *frames = signed_frames; |
| 227 | ret = 0; |
| 228 | } |
| 229 | } |
| 230 | } |
| 231 | return ret; |
| 232 | } |
| 233 | |
Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 234 | /* |
| 235 | * I/O |
| 236 | */ |
Andy Hung | 8785fe1 | 2015-08-04 14:57:50 -0700 | [diff] [blame] | 237 | int proxy_write(alsa_device_proxy * proxy, const void *data, unsigned int count) |
Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 238 | { |
Andy Hung | 8785fe1 | 2015-08-04 14:57:50 -0700 | [diff] [blame] | 239 | int ret = pcm_write(proxy->pcm, data, count); |
| 240 | if (ret == 0) { |
| 241 | proxy->transferred += count / proxy->frame_size; |
| 242 | } |
| 243 | return ret; |
Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 244 | } |
| 245 | |
| 246 | int proxy_read(const alsa_device_proxy * proxy, void *data, unsigned int count) |
| 247 | { |
| 248 | return pcm_read(proxy->pcm, data, count); |
| 249 | } |
Paul McLean | 21b04ad | 2016-05-25 14:07:00 -0600 | [diff] [blame] | 250 | |
| 251 | /* |
| 252 | * Debugging |
| 253 | */ |
| 254 | void proxy_dump(const alsa_device_proxy* proxy, int fd) |
| 255 | { |
| 256 | if (proxy != NULL) { |
| 257 | dprintf(fd, " channels: %d\n", proxy->alsa_config.channels); |
| 258 | dprintf(fd, " rate: %d\n", proxy->alsa_config.rate); |
| 259 | dprintf(fd, " period_size: %d\n", proxy->alsa_config.period_size); |
| 260 | dprintf(fd, " period_count: %d\n", proxy->alsa_config.period_count); |
| 261 | dprintf(fd, " format: %d\n", proxy->alsa_config.format); |
| 262 | } |
| 263 | } |
Paul McLean | 948a6a4 | 2017-03-08 15:06:27 -0700 | [diff] [blame] | 264 | |
Andy Hung | 2c95978 | 2017-10-27 20:20:27 -0700 | [diff] [blame] | 265 | int proxy_scan_rates(alsa_device_proxy * proxy, const unsigned sample_rates[]) { |
| 266 | const alsa_device_profile* profile = proxy->profile; |
Paul McLean | 948a6a4 | 2017-03-08 15:06:27 -0700 | [diff] [blame] | 267 | if (profile->card < 0 || profile->device < 0) { |
| 268 | return -EINVAL; |
| 269 | } |
| 270 | |
| 271 | struct pcm_config alsa_config; |
| 272 | memcpy(&alsa_config, &proxy->alsa_config, sizeof(alsa_config)); |
| 273 | |
| 274 | struct pcm * alsa_pcm; |
| 275 | int rate_index = 0; |
| 276 | while (sample_rates[rate_index] != 0) { |
| 277 | alsa_config.rate = sample_rates[rate_index]; |
| 278 | alsa_pcm = pcm_open(profile->card, profile->device, |
| 279 | profile->direction | PCM_MONOTONIC, &alsa_config); |
| 280 | if (alsa_pcm != NULL) { |
| 281 | if (pcm_is_ready(alsa_pcm)) { |
| 282 | pcm_close(alsa_pcm); |
| 283 | return rate_index; |
| 284 | } |
| 285 | |
| 286 | pcm_close(alsa_pcm); |
| 287 | } |
| 288 | |
| 289 | rate_index++; |
| 290 | } |
| 291 | |
| 292 | return -EINVAL; |
| 293 | } |