| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "alsa_device_proxy" |
| /*#define LOG_NDEBUG 0*/ |
| /*#define LOG_PCM_PARAMS 0*/ |
| |
| #include <log/log.h> |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include <audio_utils/clock.h> |
| |
| #include "include/alsa_device_proxy.h" |
| |
| #include "include/alsa_logging.h" |
| |
| #define DEFAULT_PERIOD_SIZE 1024 |
| #define DEFAULT_PERIOD_COUNT 2 |
| |
| #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) |
| |
| static const unsigned format_byte_size_map[] = { |
| 2, /* PCM_FORMAT_S16_LE */ |
| 4, /* PCM_FORMAT_S32_LE */ |
| 1, /* PCM_FORMAT_S8 */ |
| 4, /* PCM_FORMAT_S24_LE */ |
| 3, /* PCM_FORMAT_S24_3LE */ |
| }; |
| |
| int proxy_prepare(alsa_device_proxy * proxy, const alsa_device_profile* profile, |
| struct pcm_config * config) |
| { |
| int ret = 0; |
| |
| ALOGV("proxy_prepare(c:%d, d:%d)", profile->card, profile->device); |
| |
| proxy->profile = profile; |
| |
| #ifdef LOG_PCM_PARAMS |
| log_pcm_config(config, "proxy_setup()"); |
| #endif |
| |
| if (config->format != PCM_FORMAT_INVALID && profile_is_format_valid(profile, config->format)) { |
| proxy->alsa_config.format = config->format; |
| } else { |
| proxy->alsa_config.format = profile->default_config.format; |
| ALOGW("Invalid format %d - using default %d.", |
| config->format, profile->default_config.format); |
| // Indicate override when default format was not requested |
| if (config->format != PCM_FORMAT_INVALID) { |
| ret = -EINVAL; |
| } |
| } |
| |
| if (config->rate != 0 && profile_is_sample_rate_valid(profile, config->rate)) { |
| proxy->alsa_config.rate = config->rate; |
| } else { |
| proxy->alsa_config.rate = profile->default_config.rate; |
| ALOGW("Invalid sample rate %u - using default %u.", |
| config->rate, profile->default_config.rate); |
| // Indicate override when default rate was not requested |
| if (config->rate != 0) { |
| ret = -EINVAL; |
| } |
| } |
| |
| if (config->channels != 0 && profile_is_channel_count_valid(profile, config->channels)) { |
| proxy->alsa_config.channels = config->channels; |
| } else { |
| proxy->alsa_config.channels = profile_get_closest_channel_count(profile, config->channels); |
| ALOGW("Invalid channel count %u - using closest %u.", |
| config->channels, proxy->alsa_config.channels); |
| // Indicate override when default channel count was not requested |
| if (config->channels != 0) { |
| ret = -EINVAL; |
| } |
| } |
| |
| proxy->alsa_config.period_count = profile->default_config.period_count; |
| proxy->alsa_config.period_size = |
| profile_get_period_size(proxy->profile, proxy->alsa_config.rate); |
| |
| // Hack for USB accessory audio. |
| // Here we set the correct value for period_count if tinyalsa fails to get it from the |
| // f_audio_source driver. |
| if (proxy->alsa_config.period_count == 0) { |
| proxy->alsa_config.period_count = 4; |
| } |
| |
| proxy->pcm = NULL; |
| // config format should be checked earlier against profile. |
| if (config->format >= 0 && (size_t)config->format < ARRAY_SIZE(format_byte_size_map)) { |
| proxy->frame_size = format_byte_size_map[config->format] * proxy->alsa_config.channels; |
| } else { |
| proxy->frame_size = 1; |
| } |
| |
| // let's check to make sure we can ACTUALLY use the maximum rate (with the channel count) |
| // Note that profile->sample_rates is sorted highest to lowest, so the scan will get |
| // us the highest working rate |
| int max_rate_index = proxy_scan_rates(proxy, profile->sample_rates); |
| if (max_rate_index >= 0) { |
| if (proxy->alsa_config.rate > profile->sample_rates[max_rate_index]) { |
| ALOGW("Limiting samplnig rate from %u to %u.", |
| proxy->alsa_config.rate, profile->sample_rates[max_rate_index]); |
| proxy->alsa_config.rate = profile->sample_rates[max_rate_index]; |
| ret = -EINVAL; |
| } |
| } |
| return ret; |
| } |
| |
| int proxy_open(alsa_device_proxy * proxy) |
| { |
| const alsa_device_profile* profile = proxy->profile; |
| ALOGV("proxy_open(card:%d device:%d %s)", profile->card, profile->device, |
| profile->direction == PCM_OUT ? "PCM_OUT" : "PCM_IN"); |
| |
| if (profile->card < 0 || profile->device < 0) { |
| return -EINVAL; |
| } |
| |
| proxy->pcm = pcm_open(profile->card, profile->device, |
| profile->direction | PCM_MONOTONIC, &proxy->alsa_config); |
| if (proxy->pcm == NULL) { |
| return -ENOMEM; |
| } |
| |
| if (!pcm_is_ready(proxy->pcm)) { |
| ALOGE(" proxy_open() pcm_is_ready() failed: %s", pcm_get_error(proxy->pcm)); |
| #if defined(LOG_PCM_PARAMS) |
| log_pcm_config(&proxy->alsa_config, "config"); |
| #endif |
| pcm_close(proxy->pcm); |
| proxy->pcm = NULL; |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| void proxy_close(alsa_device_proxy * proxy) |
| { |
| ALOGV("proxy_close() [pcm:%p]", proxy->pcm); |
| |
| if (proxy->pcm != NULL) { |
| pcm_close(proxy->pcm); |
| proxy->pcm = NULL; |
| } |
| } |
| |
| /* |
| * Sample Rate |
| */ |
| unsigned proxy_get_sample_rate(const alsa_device_proxy * proxy) |
| { |
| return proxy->alsa_config.rate; |
| } |
| |
| /* |
| * Format |
| */ |
| enum pcm_format proxy_get_format(const alsa_device_proxy * proxy) |
| { |
| return proxy->alsa_config.format; |
| } |
| |
| /* |
| * Channel Count |
| */ |
| unsigned proxy_get_channel_count(const alsa_device_proxy * proxy) |
| { |
| return proxy->alsa_config.channels; |
| } |
| |
| /* |
| * Other |
| */ |
| unsigned int proxy_get_period_size(const alsa_device_proxy * proxy) |
| { |
| return proxy->alsa_config.period_size; |
| } |
| |
| unsigned int proxy_get_period_count(const alsa_device_proxy * proxy) |
| { |
| return proxy->alsa_config.period_count; |
| } |
| |
| unsigned proxy_get_latency(const alsa_device_proxy * proxy) |
| { |
| return (proxy_get_period_size(proxy) * proxy_get_period_count(proxy) * 1000) |
| / proxy_get_sample_rate(proxy); |
| } |
| |
| int proxy_get_presentation_position(const alsa_device_proxy * proxy, |
| uint64_t *frames, struct timespec *timestamp) |
| { |
| int ret = -EPERM; // -1 |
| unsigned int avail; |
| if (proxy->pcm != NULL |
| && pcm_get_htimestamp(proxy->pcm, &avail, timestamp) == 0) { |
| const size_t kernel_buffer_size = |
| proxy->alsa_config.period_size * proxy->alsa_config.period_count; |
| if (avail > kernel_buffer_size) { |
| ALOGE("available frames(%u) > buffer size(%zu)", avail, kernel_buffer_size); |
| } else { |
| int64_t signed_frames = proxy->transferred - kernel_buffer_size + avail; |
| // It is possible to compensate for additional driver and device delay |
| // by changing signed_frames. Example: |
| // signed_frames -= 20 /* ms */ * proxy->alsa_config.rate / 1000; |
| if (signed_frames >= 0) { |
| *frames = signed_frames; |
| ret = 0; |
| } |
| } |
| } |
| return ret; |
| } |
| |
| int proxy_get_capture_position(const alsa_device_proxy * proxy, |
| int64_t *frames, int64_t *time) |
| { |
| int ret = -ENOSYS; |
| unsigned int avail; |
| struct timespec timestamp; |
| // TODO: add logging for tinyalsa errors. |
| if (proxy->pcm != NULL |
| && pcm_get_htimestamp(proxy->pcm, &avail, ×tamp) == 0) { |
| const size_t kernel_buffer_size = |
| proxy->alsa_config.period_size * proxy->alsa_config.period_count; |
| if (avail > kernel_buffer_size) { |
| ALOGE("available frames(%u) > buffer size(%zu)", avail, kernel_buffer_size); |
| } else { |
| *frames = proxy->transferred + avail; |
| *time = audio_utils_ns_from_timespec(×tamp); |
| ret = 0; |
| } |
| } |
| return ret; |
| } |
| |
| /* |
| * I/O |
| */ |
| int proxy_write(alsa_device_proxy * proxy, const void *data, unsigned int count) |
| { |
| int ret = pcm_write(proxy->pcm, data, count); |
| if (ret == 0) { |
| proxy->transferred += count / proxy->frame_size; |
| } |
| return ret; |
| } |
| |
| int proxy_read(alsa_device_proxy * proxy, void *data, unsigned int count) |
| { |
| int ret = pcm_read(proxy->pcm, data, count); |
| if (ret == 0) { |
| proxy->transferred += count / proxy->frame_size; |
| } |
| return ret; |
| } |
| |
| /* |
| * Debugging |
| */ |
| void proxy_dump(const alsa_device_proxy* proxy, int fd) |
| { |
| if (proxy != NULL) { |
| dprintf(fd, " channels: %d\n", proxy->alsa_config.channels); |
| dprintf(fd, " rate: %d\n", proxy->alsa_config.rate); |
| dprintf(fd, " period_size: %d\n", proxy->alsa_config.period_size); |
| dprintf(fd, " period_count: %d\n", proxy->alsa_config.period_count); |
| dprintf(fd, " format: %d\n", proxy->alsa_config.format); |
| } |
| } |
| |
| int proxy_scan_rates(alsa_device_proxy * proxy, const unsigned sample_rates[]) { |
| const alsa_device_profile* profile = proxy->profile; |
| if (profile->card < 0 || profile->device < 0) { |
| return -EINVAL; |
| } |
| |
| struct pcm_config alsa_config; |
| memcpy(&alsa_config, &proxy->alsa_config, sizeof(alsa_config)); |
| |
| struct pcm * alsa_pcm; |
| int rate_index = 0; |
| while (sample_rates[rate_index] != 0) { |
| alsa_config.rate = sample_rates[rate_index]; |
| alsa_pcm = pcm_open(profile->card, profile->device, |
| profile->direction | PCM_MONOTONIC, &alsa_config); |
| if (alsa_pcm != NULL) { |
| if (pcm_is_ready(alsa_pcm)) { |
| pcm_close(alsa_pcm); |
| return rate_index; |
| } |
| |
| pcm_close(alsa_pcm); |
| } |
| |
| rate_index++; |
| } |
| |
| return -EINVAL; |
| } |