| /* |
| * 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_profile" |
| /*#define LOG_NDEBUG 0*/ |
| /*#define LOG_PCM_PARAMS 0*/ |
| |
| #include <errno.h> |
| #include <inttypes.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <cutils/properties.h> |
| |
| #include <log/log.h> |
| |
| #include "include/alsa_device_profile.h" |
| #include "include/alsa_format.h" |
| #include "include/alsa_logging.h" |
| |
| #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) |
| |
| #define PERIOD_DURATION_US (5 * 1000) |
| |
| #define DEFAULT_PERIOD_SIZE 1024 |
| |
| static const char * const format_string_map[] = { |
| "AUDIO_FORMAT_PCM_16_BIT", /* "PCM_FORMAT_S16_LE", */ |
| "AUDIO_FORMAT_PCM_32_BIT", /* "PCM_FORMAT_S32_LE", */ |
| "AUDIO_FORMAT_PCM_8_BIT", /* "PCM_FORMAT_S8", */ |
| "AUDIO_FORMAT_PCM_8_24_BIT", /* "PCM_FORMAT_S24_LE", */ |
| "AUDIO_FORMAT_PCM_24_BIT_PACKED"/* "PCM_FORMAT_S24_3LE" */ |
| }; |
| |
| extern int8_t const pcm_format_value_map[50]; |
| |
| /* Sort these in terms of preference (best first). |
| 192 kHz is not first because it requires significant resources for possibly worse |
| quality and driver instability (depends on device). |
| The order here determines the default sample rate for the device. |
| AudioPolicyManager may not respect this ordering when picking sample rates. |
| Update MAX_PROFILE_SAMPLE_RATES after changing the array size. |
| |
| TODO: remove 32000, 22050, 12000, 11025? Each sample rate check |
| requires opening the device which may cause pops. */ |
| static const unsigned std_sample_rates[] = |
| {96000, 88200, 192000, 176400, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000}; |
| |
| static void profile_reset(alsa_device_profile* profile) |
| { |
| profile->card = profile->device = -1; |
| |
| /* terminate the attribute arrays with invalid values */ |
| profile->formats[0] = PCM_FORMAT_INVALID; |
| profile->sample_rates[0] = 0; |
| profile->channel_counts[0] = 0; |
| |
| profile->min_period_size = profile->max_period_size = 0; |
| profile->min_channel_count = profile->max_channel_count = DEFAULT_CHANNEL_COUNT; |
| |
| profile->is_valid = false; |
| } |
| |
| void profile_init(alsa_device_profile* profile, int direction) |
| { |
| profile->direction = direction; |
| profile_reset(profile); |
| } |
| |
| bool profile_is_initialized(const alsa_device_profile* profile) |
| { |
| return profile->card >= 0 && profile->device >= 0; |
| } |
| |
| bool profile_is_valid(const alsa_device_profile* profile) { |
| return profile->is_valid; |
| } |
| |
| bool profile_is_cached_for(const alsa_device_profile* profile, int card, int device) { |
| return card == profile->card && device == profile->device; |
| } |
| |
| void profile_decache(alsa_device_profile* profile) { |
| profile_reset(profile); |
| } |
| |
| /* |
| * Returns the supplied value rounded up to the next even multiple of 16 |
| */ |
| static unsigned int round_to_16_mult(unsigned int size) |
| { |
| return (size + 15) & ~15; /* 0xFFFFFFF0; */ |
| } |
| |
| /* |
| * Returns the system defined minimum period size based on the supplied sample rate. |
| */ |
| unsigned profile_calc_min_period_size(const alsa_device_profile* profile, unsigned sample_rate) |
| { |
| ALOGV("profile_calc_min_period_size(%p, rate:%d)", profile, sample_rate); |
| if (profile == NULL) { |
| return DEFAULT_PERIOD_SIZE; |
| } else { |
| unsigned period_us = property_get_int32("ro.audio.usb.period_us", PERIOD_DURATION_US); |
| unsigned num_sample_frames = ((uint64_t)sample_rate * period_us) / 1000000; |
| |
| if (num_sample_frames < profile->min_period_size) { |
| num_sample_frames = profile->min_period_size; |
| } |
| return round_to_16_mult(num_sample_frames); |
| } |
| } |
| |
| unsigned int profile_get_period_size(const alsa_device_profile* profile, unsigned sample_rate) |
| { |
| unsigned int period_size = profile_calc_min_period_size(profile, sample_rate); |
| ALOGV("profile_get_period_size(rate:%d) = %d", sample_rate, period_size); |
| return period_size; |
| } |
| |
| /* |
| * Sample Rate |
| */ |
| unsigned profile_get_default_sample_rate(const alsa_device_profile* profile) |
| { |
| /* |
| * This is probably a poor algorithm. The default sample rate should be the highest (within |
| * limits) rate that is available for both input and output. HOWEVER, the profile has only |
| * one or the other, so that will need to be done at a higher level, like in the HAL. |
| */ |
| /* |
| * TODO this won't be right in general. we should store a preferred rate as we are scanning. |
| * But right now it will return the highest rate, which may be correct. |
| */ |
| return profile_is_valid(profile) ? profile->sample_rates[0] : DEFAULT_SAMPLE_RATE; |
| } |
| |
| unsigned profile_get_highest_sample_rate(const alsa_device_profile* profile) { |
| /* The hightest sample rate is always stored in the first element of sample_rates. |
| * Note that profile_reset() initiaizes the first element of samples_rates to 0 |
| * Which is what we want to return if the profile had not been read anyway. |
| */ |
| return profile->sample_rates[0]; |
| } |
| |
| bool profile_is_sample_rate_valid(const alsa_device_profile* profile, unsigned rate) |
| { |
| if (profile_is_valid(profile)) { |
| size_t index; |
| for (index = 0; profile->sample_rates[index] != 0; index++) { |
| if (profile->sample_rates[index] == rate) { |
| return true; |
| } |
| } |
| |
| return false; |
| } else { |
| ALOGW("**** PROFILE NOT VALID!"); |
| return rate == DEFAULT_SAMPLE_RATE; |
| } |
| } |
| |
| /* |
| * Format |
| */ |
| enum pcm_format profile_get_default_format(const alsa_device_profile* profile) |
| { |
| /* |
| * TODO this won't be right in general. we should store a preferred format as we are scanning. |
| */ |
| return profile_is_valid(profile) ? profile->formats[0] : DEFAULT_SAMPLE_FORMAT; |
| } |
| |
| bool profile_is_format_valid(const alsa_device_profile* profile, enum pcm_format fmt) { |
| if (profile_is_valid(profile)) { |
| size_t index; |
| for (index = 0; profile->formats[index] != PCM_FORMAT_INVALID; index++) { |
| if (profile->formats[index] == fmt) { |
| return true; |
| } |
| } |
| |
| return false; |
| } else { |
| return fmt == DEFAULT_SAMPLE_FORMAT; |
| } |
| } |
| |
| /* |
| * Channels |
| */ |
| unsigned profile_get_default_channel_count(const alsa_device_profile* profile) |
| { |
| return profile_is_valid(profile) ? profile->channel_counts[0] : DEFAULT_CHANNEL_COUNT; |
| } |
| |
| unsigned profile_get_closest_channel_count(const alsa_device_profile* profile, unsigned count) |
| { |
| if (profile_is_valid(profile)) { |
| if (count < profile->min_channel_count) { |
| return profile->min_channel_count; |
| } else if (count > profile->max_channel_count) { |
| return profile->max_channel_count; |
| } else { |
| return count; |
| } |
| } else { |
| return 0; |
| } |
| } |
| |
| bool profile_is_channel_count_valid(const alsa_device_profile* profile, unsigned count) |
| { |
| if (profile_is_initialized(profile)) { |
| return count >= profile->min_channel_count && count <= profile->max_channel_count; |
| } else { |
| return count == DEFAULT_CHANNEL_COUNT; |
| } |
| } |
| |
| static bool profile_test_sample_rate(const alsa_device_profile* profile, unsigned rate) |
| { |
| struct pcm_config config = profile->default_config; |
| config.rate = rate; |
| // This method tests whether a sample rate is supported by the USB device |
| // by attempting to open it. |
| // |
| // The profile default_config currently contains the minimum channel count. |
| // As some usb devices cannot sustain the sample rate across all its supported |
| // channel counts, we try the largest usable channel count. This is |
| // bounded by FCC_LIMIT. |
| // |
| // If config.channels > FCC_LIMIT then we still test it for sample rate compatibility. |
| // It is possible that the USB device does not support less than a certain number |
| // of channels, and that minimum number is > FCC_LIMIT. Then the default_config |
| // channels will be > FCC_LIMIT (and we still proceed with the test). |
| // |
| // For example, the FocusRite Scarlett 18i20 supports between 16 to 20 playback |
| // channels and between 14 to 18 capture channels. |
| // If FCC_LIMIT is 8, we still need to use and test 16 output channels for playback |
| // and 14 input channels for capture, as that will be the ALSA opening configuration. |
| // The Android USB audio HAL layer will automatically zero pad to accommodate the |
| // 16 playback or 14 capture channel configuration from the (up to FCC_LIMIT) |
| // channels delivered by AudioFlinger. |
| if (config.channels < FCC_LIMIT) { |
| config.channels = profile->max_channel_count; |
| if (config.channels > FCC_LIMIT) config.channels = FCC_LIMIT; |
| } |
| bool works = false; /* let's be pessimistic */ |
| struct pcm * pcm = pcm_open(profile->card, profile->device, |
| profile->direction, &config); |
| |
| if (pcm != NULL) { |
| works = pcm_is_ready(pcm); |
| pcm_close(pcm); |
| } |
| |
| return works; |
| } |
| |
| static unsigned profile_enum_sample_rates(alsa_device_profile* profile, unsigned min, unsigned max) |
| { |
| unsigned num_entries = 0; |
| unsigned index; |
| |
| for (index = 0; index < ARRAY_SIZE(std_sample_rates) && |
| num_entries < ARRAY_SIZE(profile->sample_rates) - 1; |
| index++) { |
| if (std_sample_rates[index] >= min && std_sample_rates[index] <= max |
| && profile_test_sample_rate(profile, std_sample_rates[index])) { |
| profile->sample_rates[num_entries++] = std_sample_rates[index]; |
| } |
| } |
| profile->sample_rates[num_entries] = 0; /* terminate */ |
| return num_entries; /* return # of supported rates */ |
| } |
| |
| static unsigned profile_enum_sample_formats(alsa_device_profile* profile, |
| const struct pcm_mask * mask) |
| { |
| const int num_slots = ARRAY_SIZE(mask->bits); |
| const int bits_per_slot = sizeof(mask->bits[0]) * 8; |
| |
| const int table_size = ARRAY_SIZE(pcm_format_value_map); |
| |
| int slot_index, bit_index, table_index; |
| table_index = 0; |
| int num_written = 0; |
| for (slot_index = 0; slot_index < num_slots && table_index < table_size; |
| slot_index++) { |
| unsigned bit_mask = 1; |
| for (bit_index = 0; |
| bit_index < bits_per_slot && table_index < table_size; |
| bit_index++) { |
| if ((mask->bits[slot_index] & bit_mask) != 0) { |
| enum pcm_format format = pcm_format_value_map[table_index]; |
| /* Never return invalid (unrecognized) or 8-bit */ |
| if (format != PCM_FORMAT_INVALID && format != PCM_FORMAT_S8) { |
| profile->formats[num_written++] = format; |
| if (num_written == ARRAY_SIZE(profile->formats) - 1) { |
| /* leave at least one PCM_FORMAT_INVALID at the end */ |
| goto end; |
| } |
| } |
| } |
| bit_mask <<= 1; |
| table_index++; |
| } |
| } |
| end: |
| profile->formats[num_written] = PCM_FORMAT_INVALID; |
| return num_written; |
| } |
| |
| static unsigned profile_enum_channel_counts(alsa_device_profile* profile, unsigned min, |
| unsigned max) |
| { |
| /* modify alsa_device_profile.h if you change the std_channel_counts[] array. */ |
| // The order of this array controls the order for channel mask generation. |
| // In general, this is just counting from max to min not skipping anything, |
| // but need not be that way. |
| static const unsigned std_channel_counts[FCC_24] = { |
| 24, 23, 22, 21, 20, 19, 18, 17, |
| 16, 15, 14, 13, 12, 11, 10, 9, |
| 8, 7, 6, 5, 4, 3, 2, 1 |
| }; |
| |
| unsigned num_counts = 0; |
| unsigned index; |
| int max_allowed_index = -1; // index of maximum allowed channel count reported by device. |
| /* TODO write a profile_test_channel_count() */ |
| /* Ensure there is at least one invalid channel count to terminate the channel counts array */ |
| for (index = 0; index < ARRAY_SIZE(std_channel_counts) && |
| num_counts < ARRAY_SIZE(profile->channel_counts) - 1; |
| index++) { |
| const unsigned test_count = std_channel_counts[index]; |
| /* TODO Do we want a channel counts test? */ |
| if (test_count <= FCC_LIMIT) { |
| if (test_count >= min && test_count <= max /* && |
| profile_test_channel_count(profile, channel_counts[index])*/) { |
| profile->channel_counts[num_counts++] = test_count; |
| } |
| if (max_allowed_index < 0 || |
| std_channel_counts[max_allowed_index] < test_count) { |
| max_allowed_index = index; |
| } |
| } |
| } |
| // if we have no match with the standard counts, we use the largest (preferred) std count. |
| // Note: the usb hal will adjust channel data properly to fit. |
| if (num_counts == 0 && max_allowed_index >= 0) { |
| ALOGW("usb device does not match std channel counts, setting to %d", |
| std_channel_counts[max_allowed_index]); |
| profile->channel_counts[num_counts++] = std_channel_counts[max_allowed_index]; |
| } |
| profile->channel_counts[num_counts] = 0; |
| return num_counts; /* return # of supported counts */ |
| } |
| |
| /* |
| * Reads and decodes configuration info from the specified ALSA card/device. |
| */ |
| static int read_alsa_device_config(alsa_device_profile * profile, struct pcm_config * config) |
| { |
| ALOGV("usb:audio_hw - read_alsa_device_config(c:%d d:%d t:0x%X)", |
| profile->card, profile->device, profile->direction); |
| |
| if (profile->card < 0 || profile->device < 0) { |
| return -EINVAL; |
| } |
| |
| struct pcm_params * alsa_hw_params = |
| pcm_params_get(profile->card, profile->device, profile->direction); |
| if (alsa_hw_params == NULL) { |
| return -EINVAL; |
| } |
| |
| profile->min_period_size = pcm_params_get_min(alsa_hw_params, PCM_PARAM_PERIOD_SIZE); |
| profile->max_period_size = pcm_params_get_max(alsa_hw_params, PCM_PARAM_PERIOD_SIZE); |
| |
| profile->min_channel_count = pcm_params_get_min(alsa_hw_params, PCM_PARAM_CHANNELS); |
| profile->max_channel_count = pcm_params_get_max(alsa_hw_params, PCM_PARAM_CHANNELS); |
| |
| int ret = 0; |
| |
| /* |
| * This Logging will be useful when testing new USB devices. |
| */ |
| #ifdef LOG_PCM_PARAMS |
| log_pcm_params(alsa_hw_params); |
| #endif |
| |
| config->channels = pcm_params_get_min(alsa_hw_params, PCM_PARAM_CHANNELS); |
| // For output devices, let's make sure we choose at least stereo |
| // (assuming the device supports it). |
| if (profile->direction == PCM_OUT && |
| config->channels < 2 && pcm_params_get_max(alsa_hw_params, PCM_PARAM_CHANNELS) >= 2) { |
| config->channels = 2; |
| } |
| config->rate = pcm_params_get_min(alsa_hw_params, PCM_PARAM_RATE); |
| // Prefer 48K or 44.1K |
| if (config->rate < 48000 && |
| pcm_params_get_max(alsa_hw_params, PCM_PARAM_RATE) >= 48000) { |
| config->rate = 48000; |
| } else if (config->rate < 44100 && |
| pcm_params_get_max(alsa_hw_params, PCM_PARAM_RATE) >= 44100) { |
| config->rate = 44100; |
| } |
| config->period_size = profile_calc_min_period_size(profile, config->rate); |
| config->period_count = pcm_params_get_min(alsa_hw_params, PCM_PARAM_PERIODS); |
| config->format = get_pcm_format_for_mask(pcm_params_get_mask(alsa_hw_params, PCM_PARAM_FORMAT)); |
| #ifdef LOG_PCM_PARAMS |
| log_pcm_config(config, "read_alsa_device_config"); |
| #endif |
| if (config->format == PCM_FORMAT_INVALID) { |
| ret = -EINVAL; |
| } |
| |
| pcm_params_free(alsa_hw_params); |
| |
| return ret; |
| } |
| |
| bool profile_read_device_info(alsa_device_profile* profile) |
| { |
| if (!profile_is_initialized(profile)) { |
| return false; |
| } |
| |
| /* let's get some defaults */ |
| read_alsa_device_config(profile, &profile->default_config); |
| ALOGV("default_config chans:%d rate:%d format:%d count:%d size:%d", |
| profile->default_config.channels, profile->default_config.rate, |
| profile->default_config.format, profile->default_config.period_count, |
| profile->default_config.period_size); |
| |
| struct pcm_params * alsa_hw_params = pcm_params_get(profile->card, |
| profile->device, |
| profile->direction); |
| if (alsa_hw_params == NULL) { |
| return false; |
| } |
| |
| /* Formats */ |
| const struct pcm_mask * format_mask = pcm_params_get_mask(alsa_hw_params, PCM_PARAM_FORMAT); |
| profile_enum_sample_formats(profile, format_mask); |
| |
| /* Channels */ |
| profile_enum_channel_counts( |
| profile, pcm_params_get_min(alsa_hw_params, PCM_PARAM_CHANNELS), |
| pcm_params_get_max(alsa_hw_params, PCM_PARAM_CHANNELS)); |
| |
| /* Sample Rates */ |
| profile_enum_sample_rates( |
| profile, pcm_params_get_min(alsa_hw_params, PCM_PARAM_RATE), |
| pcm_params_get_max(alsa_hw_params, PCM_PARAM_RATE)); |
| |
| profile->is_valid = true; |
| |
| pcm_params_free(alsa_hw_params); |
| return true; |
| } |
| |
| char * profile_get_sample_rate_strs(const alsa_device_profile* profile) |
| { |
| /* if we assume that rate strings are about 5 characters (48000 is 5), plus ~1 for a |
| * delimiter "|" this buffer has room for about 22 rate strings which seems like |
| * way too much, but it's a stack variable so only temporary. |
| */ |
| char buffer[128]; |
| buffer[0] = '\0'; |
| size_t buffSize = ARRAY_SIZE(buffer); |
| size_t curStrLen = 0; |
| |
| char numBuffer[32]; |
| |
| size_t numEntries = 0; |
| size_t index; |
| for (index = 0; profile->sample_rates[index] != 0; index++) { |
| snprintf(numBuffer, sizeof(numBuffer), "%u", profile->sample_rates[index]); |
| // account for both the null, and potentially the bar. |
| if (buffSize - curStrLen < strlen(numBuffer) + (numEntries != 0 ? 2 : 1)) { |
| /* we don't have room for another, so bail at this point rather than |
| * return a malformed rate string |
| */ |
| break; |
| } |
| if (numEntries++ != 0) { |
| strlcat(buffer, "|", buffSize); |
| } |
| curStrLen = strlcat(buffer, numBuffer, buffSize); |
| } |
| |
| return strdup(buffer); |
| } |
| |
| char * profile_get_format_strs(const alsa_device_profile* profile) |
| { |
| /* if we assume that format strings are about 24 characters (AUDIO_FORMAT_PCM_16_BIT is 23), |
| * plus ~1 for a delimiter "|" this buffer has room for about 10 format strings which seems |
| * like way too much, but it's a stack variable so only temporary. |
| */ |
| char buffer[256]; |
| buffer[0] = '\0'; |
| size_t buffSize = ARRAY_SIZE(buffer); |
| size_t curStrLen = 0; |
| |
| size_t numEntries = 0; |
| size_t index = 0; |
| for (index = 0; profile->formats[index] != PCM_FORMAT_INVALID; index++) { |
| // account for both the null, and potentially the bar. |
| if (buffSize - curStrLen < strlen(format_string_map[profile->formats[index]]) |
| + (numEntries != 0 ? 2 : 1)) { |
| /* we don't have room for another, so bail at this point rather than |
| * return a malformed rate string |
| */ |
| break; |
| } |
| if (numEntries++ != 0) { |
| strlcat(buffer, "|", buffSize); |
| } |
| curStrLen = strlcat(buffer, format_string_map[profile->formats[index]], buffSize); |
| } |
| |
| return strdup(buffer); |
| } |
| |
| char * profile_get_channel_count_strs(const alsa_device_profile* profile) |
| { |
| // we use only the canonical even number channel position masks. |
| static const char * const out_chans_strs[] = { |
| [0] = "AUDIO_CHANNEL_NONE", /* will never be taken as this is a terminator */ |
| [1] = "AUDIO_CHANNEL_OUT_MONO", |
| [2] = "AUDIO_CHANNEL_OUT_STEREO", |
| [4] = "AUDIO_CHANNEL_OUT_QUAD", |
| [6] = "AUDIO_CHANNEL_OUT_5POINT1", |
| [FCC_8] = "AUDIO_CHANNEL_OUT_7POINT1", |
| [FCC_12] = "AUDIO_CHANNEL_OUT_7POINT1POINT4", |
| [FCC_24] = "AUDIO_CHANNEL_OUT_22POINT2", |
| }; |
| |
| static const char * const in_chans_strs[] = { |
| [0] = "AUDIO_CHANNEL_NONE", /* will never be taken as this is a terminator */ |
| [1] = "AUDIO_CHANNEL_IN_MONO", |
| [2] = "AUDIO_CHANNEL_IN_STEREO", |
| /* channel counts greater than this not considered */ |
| }; |
| |
| static const char * const index_chans_strs[] = { |
| [0] = "AUDIO_CHANNEL_NONE", /* will never be taken as this is a terminator */ |
| |
| [1] = "AUDIO_CHANNEL_INDEX_MASK_1", |
| [2] = "AUDIO_CHANNEL_INDEX_MASK_2", |
| [3] = "AUDIO_CHANNEL_INDEX_MASK_3", |
| [4] = "AUDIO_CHANNEL_INDEX_MASK_4", |
| [5] = "AUDIO_CHANNEL_INDEX_MASK_5", |
| [6] = "AUDIO_CHANNEL_INDEX_MASK_6", |
| [7] = "AUDIO_CHANNEL_INDEX_MASK_7", |
| [8] = "AUDIO_CHANNEL_INDEX_MASK_8", |
| |
| [9] = "AUDIO_CHANNEL_INDEX_MASK_9", |
| [10] = "AUDIO_CHANNEL_INDEX_MASK_10", |
| [11] = "AUDIO_CHANNEL_INDEX_MASK_11", |
| [12] = "AUDIO_CHANNEL_INDEX_MASK_12", |
| [13] = "AUDIO_CHANNEL_INDEX_MASK_13", |
| [14] = "AUDIO_CHANNEL_INDEX_MASK_14", |
| [15] = "AUDIO_CHANNEL_INDEX_MASK_15", |
| [16] = "AUDIO_CHANNEL_INDEX_MASK_16", |
| |
| [17] = "AUDIO_CHANNEL_INDEX_MASK_17", |
| [18] = "AUDIO_CHANNEL_INDEX_MASK_18", |
| [19] = "AUDIO_CHANNEL_INDEX_MASK_19", |
| [20] = "AUDIO_CHANNEL_INDEX_MASK_20", |
| [21] = "AUDIO_CHANNEL_INDEX_MASK_21", |
| [22] = "AUDIO_CHANNEL_INDEX_MASK_22", |
| [23] = "AUDIO_CHANNEL_INDEX_MASK_23", |
| [24] = "AUDIO_CHANNEL_INDEX_MASK_24", |
| }; |
| |
| const bool isOutProfile = profile->direction == PCM_OUT; |
| |
| const char * const * const chans_strs = isOutProfile ? out_chans_strs : in_chans_strs; |
| size_t chans_strs_size = |
| isOutProfile ? ARRAY_SIZE(out_chans_strs) : ARRAY_SIZE(in_chans_strs); |
| if (chans_strs_size > FCC_LIMIT + 1) chans_strs_size = FCC_LIMIT + 1; // starts with 0. |
| |
| /* |
| * MAX_CHANNEL_NAME_LEN: The longest channel name so far is "AUDIO_CHANNEL_OUT_7POINT1POINT4" |
| * at 31 chars, add 1 for the "|" delimiter, so we allocate 48 chars to be safe. |
| * |
| * We allocate room for channel index and channel position strings (2x). |
| */ |
| const size_t MAX_CHANNEL_NAME_LEN = 48; |
| char buffer[MAX_CHANNEL_NAME_LEN * (FCC_LIMIT * 2) + 1]; |
| buffer[0] = '\0'; |
| size_t buffSize = ARRAY_SIZE(buffer); |
| size_t curStrLen = 0; |
| |
| /* We currently support MONO and STEREO, and always report STEREO but some (many) |
| * USB Audio Devices may only announce support for MONO (a headset mic for example), or |
| * The total number of output channels. SO, if the device itself doesn't explicitly |
| * support STEREO, append to the channel config strings we are generating. |
| * |
| * The MONO and STEREO positional channel masks are provided for legacy compatibility. |
| * For multichannel (n > 2) we only expose channel index masks. |
| */ |
| // Always support stereo |
| curStrLen = strlcat(buffer, chans_strs[2], buffSize); |
| |
| size_t index; |
| unsigned channel_count; |
| for (index = 0; |
| (channel_count = profile->channel_counts[index]) != 0; |
| index++) { |
| |
| if (channel_count > FCC_LIMIT) continue; |
| |
| /* we only show positional information for mono (stereo handled already) */ |
| if (channel_count < chans_strs_size |
| && chans_strs[channel_count] != NULL |
| && channel_count < 2 /* positional only for fewer than 2 channels */) { |
| // account for the '|' and the '\0' |
| if (buffSize - curStrLen < strlen(chans_strs[channel_count]) + 2) { |
| /* we don't have room for another, so bail at this point rather than |
| * return a malformed rate string |
| */ |
| break; |
| } |
| |
| if (curStrLen != 0) strlcat(buffer, "|", buffSize); |
| curStrLen = strlcat(buffer, chans_strs[channel_count], buffSize); |
| } |
| |
| // handle channel index masks for both input and output |
| // +2 to account for the '|' and the '\0' |
| if (buffSize - curStrLen < strlen(index_chans_strs[channel_count]) + 2) { |
| /* we don't have room for another, so bail at this point rather than |
| * return a malformed rate string |
| */ |
| break; |
| } |
| |
| if (curStrLen != 0) strlcat(buffer, "|", buffSize); |
| curStrLen = strlcat(buffer, index_chans_strs[channel_count], buffSize); |
| } |
| |
| return strdup(buffer); |
| } |
| |
| void profile_dump(const alsa_device_profile* profile, int fd) |
| { |
| if (profile == NULL) { |
| dprintf(fd, " %s\n", "No USB Profile"); |
| return; /* bail early */ |
| } |
| |
| if (!profile->is_valid) { |
| dprintf(fd, " Profile is INVALID"); |
| } |
| |
| /* card/device/direction */ |
| dprintf(fd, " card:%d, device:%d - %s\n", |
| profile->card, profile->device, profile->direction == PCM_OUT ? "OUT" : "IN"); |
| |
| /* formats */ |
| dprintf(fd, " Formats: "); |
| for (int fmtIndex = 0; |
| profile->formats[fmtIndex] != PCM_FORMAT_INVALID && fmtIndex < MAX_PROFILE_FORMATS; |
| fmtIndex++) { |
| dprintf(fd, "%d ", profile->formats[fmtIndex]); |
| } |
| dprintf(fd, "\n"); |
| |
| /* sample rates */ |
| dprintf(fd, " Rates: "); |
| for (int rateIndex = 0; |
| profile->sample_rates[rateIndex] != 0 && rateIndex < MAX_PROFILE_SAMPLE_RATES; |
| rateIndex++) { |
| dprintf(fd, "%u ", profile->sample_rates[rateIndex]); |
| } |
| dprintf(fd, "\n"); |
| |
| // channel counts |
| dprintf(fd, " Channel Counts: "); |
| for (int cntIndex = 0; |
| profile->channel_counts[cntIndex] != 0 && cntIndex < MAX_PROFILE_CHANNEL_COUNTS; |
| cntIndex++) { |
| dprintf(fd, "%u ", profile->channel_counts[cntIndex]); |
| } |
| dprintf(fd, "\n"); |
| |
| dprintf(fd, " min/max period size [%u : %u]\n", |
| profile->min_period_size,profile-> max_period_size); |
| dprintf(fd, " min/max channel count [%u : %u]\n", |
| profile->min_channel_count, profile->max_channel_count); |
| |
| // struct pcm_config default_config; |
| dprintf(fd, " Default Config:\n"); |
| dprintf(fd, " channels: %d\n", profile->default_config.channels); |
| dprintf(fd, " rate: %d\n", profile->default_config.rate); |
| dprintf(fd, " period_size: %d\n", profile->default_config.period_size); |
| dprintf(fd, " period_count: %d\n", profile->default_config.period_count); |
| dprintf(fd, " format: %d\n", profile->default_config.format); |
| } |