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109 lines
4.8 KiB
109 lines
4.8 KiB
/* |
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* Copyright (C) 2014 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#define LOG_TAG "alsa_format" |
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/*#define LOG_NDEBUG 0*/ |
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#include "include/alsa_format.h" |
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#include <tinyalsa/asoundlib.h> |
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#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) |
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/* |
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* Maps from bit position in pcm_mask to PCM_ format constants. |
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*/ |
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int8_t const pcm_format_value_map[50] = { |
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PCM_FORMAT_S8, /* 00 - SNDRV_PCM_FORMAT_S8 */ |
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PCM_FORMAT_INVALID, /* 01 - SNDRV_PCM_FORMAT_U8 */ |
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PCM_FORMAT_S16_LE, /* 02 - SNDRV_PCM_FORMAT_S16_LE */ |
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PCM_FORMAT_INVALID, /* 03 - SNDRV_PCM_FORMAT_S16_BE */ |
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PCM_FORMAT_INVALID, /* 04 - SNDRV_PCM_FORMAT_U16_LE */ |
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PCM_FORMAT_INVALID, /* 05 - SNDRV_PCM_FORMAT_U16_BE */ |
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PCM_FORMAT_S24_LE, /* 06 - SNDRV_PCM_FORMAT_S24_LE */ |
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PCM_FORMAT_INVALID, /* 07 - SNDRV_PCM_FORMAT_S24_BE */ |
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PCM_FORMAT_INVALID, /* 08 - SNDRV_PCM_FORMAT_U24_LE */ |
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PCM_FORMAT_INVALID, /* 09 - SNDRV_PCM_FORMAT_U24_BE */ |
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PCM_FORMAT_S32_LE, /* 10 - SNDRV_PCM_FORMAT_S32_LE */ |
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PCM_FORMAT_INVALID, /* 11 - SNDRV_PCM_FORMAT_S32_BE */ |
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PCM_FORMAT_INVALID, /* 12 - SNDRV_PCM_FORMAT_U32_LE */ |
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PCM_FORMAT_INVALID, /* 13 - SNDRV_PCM_FORMAT_U32_BE */ |
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PCM_FORMAT_INVALID, /* 14 - SNDRV_PCM_FORMAT_FLOAT_LE */ |
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PCM_FORMAT_INVALID, /* 15 - SNDRV_PCM_FORMAT_FLOAT_BE */ |
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PCM_FORMAT_INVALID, /* 16 - SNDRV_PCM_FORMAT_FLOAT64_LE */ |
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PCM_FORMAT_INVALID, /* 17 - SNDRV_PCM_FORMAT_FLOAT64_BE */ |
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PCM_FORMAT_INVALID, /* 18 - SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE */ |
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PCM_FORMAT_INVALID, /* 19 - SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE */ |
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PCM_FORMAT_INVALID, /* 20 - SNDRV_PCM_FORMAT_MU_LAW */ |
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PCM_FORMAT_INVALID, /* 21 - SNDRV_PCM_FORMAT_A_LAW */ |
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PCM_FORMAT_INVALID, /* 22 - SNDRV_PCM_FORMAT_IMA_ADPCM */ |
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PCM_FORMAT_INVALID, /* 23 - SNDRV_PCM_FORMAT_MPEG */ |
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PCM_FORMAT_INVALID, /* 24 - SNDRV_PCM_FORMAT_GSM */ |
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PCM_FORMAT_INVALID, /* 25 -> 30 (not assigned) */ |
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PCM_FORMAT_INVALID, |
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PCM_FORMAT_INVALID, |
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PCM_FORMAT_INVALID, |
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PCM_FORMAT_INVALID, |
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PCM_FORMAT_INVALID, |
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PCM_FORMAT_INVALID, /* 31 - SNDRV_PCM_FORMAT_SPECIAL */ |
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PCM_FORMAT_S24_3LE, /* 32 - SNDRV_PCM_FORMAT_S24_3LE */ |
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PCM_FORMAT_INVALID, /* 33 - SNDRV_PCM_FORMAT_S24_3BE */ |
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PCM_FORMAT_INVALID, /* 34 - SNDRV_PCM_FORMAT_U24_3LE */ |
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PCM_FORMAT_INVALID, /* 35 - SNDRV_PCM_FORMAT_U24_3BE */ |
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PCM_FORMAT_INVALID, /* 36 - SNDRV_PCM_FORMAT_S20_3LE */ |
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PCM_FORMAT_INVALID, /* 37 - SNDRV_PCM_FORMAT_S20_3BE */ |
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PCM_FORMAT_INVALID, /* 38 - SNDRV_PCM_FORMAT_U20_3LE */ |
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PCM_FORMAT_INVALID, /* 39 - SNDRV_PCM_FORMAT_U20_3BE */ |
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PCM_FORMAT_INVALID, /* 40 - SNDRV_PCM_FORMAT_S18_3LE */ |
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PCM_FORMAT_INVALID, /* 41 - SNDRV_PCM_FORMAT_S18_3BE */ |
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PCM_FORMAT_INVALID, /* 42 - SNDRV_PCM_FORMAT_U18_3LE */ |
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PCM_FORMAT_INVALID, /* 43 - SNDRV_PCM_FORMAT_U18_3BE */ |
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PCM_FORMAT_INVALID, /* 44 - SNDRV_PCM_FORMAT_G723_24 */ |
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PCM_FORMAT_INVALID, /* 45 - SNDRV_PCM_FORMAT_G723_24_1B */ |
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PCM_FORMAT_INVALID, /* 46 - SNDRV_PCM_FORMAT_G723_40 */ |
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PCM_FORMAT_INVALID, /* 47 - SNDRV_PCM_FORMAT_G723_40_1B */ |
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PCM_FORMAT_INVALID, /* 48 - SNDRV_PCM_FORMAT_DSD_U8 */ |
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PCM_FORMAT_INVALID /* 49 - SNDRV_PCM_FORMAT_DSD_U16_LE */ |
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}; |
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/* |
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* Scans the provided format mask and returns the first non-8 bit sample |
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* format supported by the devices. |
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*/ |
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enum pcm_format get_pcm_format_for_mask(struct pcm_mask* mask) |
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{ |
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int num_slots = ARRAY_SIZE(mask->bits); |
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int bits_per_slot = sizeof(mask->bits[0]) * 8; |
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int table_size = ARRAY_SIZE(pcm_format_value_map); |
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int slot_index, bit_index, table_index; |
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table_index = 0; |
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for (slot_index = 0; slot_index < num_slots && table_index < table_size; slot_index++) { |
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unsigned bit_mask = 1; |
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for (bit_index = 0; bit_index < bits_per_slot && table_index < table_size; bit_index++) { |
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/* skip any 8-bit formats */ |
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if (table_index >= 2 && (mask->bits[slot_index] & bit_mask) != 0) { |
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/* just return the first one which will be at least 16-bit */ |
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return (int)pcm_format_value_map[table_index]; |
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} |
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bit_mask <<= 1; |
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table_index++; |
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} |
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} |
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return PCM_FORMAT_INVALID; |
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}
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