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_format" |
| 18 | /*#define LOG_NDEBUG 0*/ |
| 19 | |
| 20 | #include "include/alsa_format.h" |
| 21 | |
| 22 | #include <tinyalsa/asoundlib.h> |
| 23 | |
| 24 | #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0])) |
| 25 | |
| 26 | /* |
| 27 | * Maps from bit position in pcm_mask to PCM_ format constants. |
| 28 | */ |
| 29 | int8_t const pcm_format_value_map[50] = { |
| 30 | PCM_FORMAT_S8, /* 00 - SNDRV_PCM_FORMAT_S8 */ |
| 31 | PCM_FORMAT_INVALID, /* 01 - SNDRV_PCM_FORMAT_U8 */ |
| 32 | PCM_FORMAT_S16_LE, /* 02 - SNDRV_PCM_FORMAT_S16_LE */ |
| 33 | PCM_FORMAT_INVALID, /* 03 - SNDRV_PCM_FORMAT_S16_BE */ |
| 34 | PCM_FORMAT_INVALID, /* 04 - SNDRV_PCM_FORMAT_U16_LE */ |
| 35 | PCM_FORMAT_INVALID, /* 05 - SNDRV_PCM_FORMAT_U16_BE */ |
Paul McLean | 9529ade | 2015-05-19 08:06:39 -0700 | [diff] [blame] | 36 | PCM_FORMAT_S24_LE, /* 06 - SNDRV_PCM_FORMAT_S24_LE */ |
Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 37 | PCM_FORMAT_INVALID, /* 07 - SNDRV_PCM_FORMAT_S24_BE */ |
| 38 | PCM_FORMAT_INVALID, /* 08 - SNDRV_PCM_FORMAT_U24_LE */ |
| 39 | PCM_FORMAT_INVALID, /* 09 - SNDRV_PCM_FORMAT_U24_BE */ |
| 40 | PCM_FORMAT_S32_LE, /* 10 - SNDRV_PCM_FORMAT_S32_LE */ |
| 41 | PCM_FORMAT_INVALID, /* 11 - SNDRV_PCM_FORMAT_S32_BE */ |
| 42 | PCM_FORMAT_INVALID, /* 12 - SNDRV_PCM_FORMAT_U32_LE */ |
| 43 | PCM_FORMAT_INVALID, /* 13 - SNDRV_PCM_FORMAT_U32_BE */ |
| 44 | PCM_FORMAT_INVALID, /* 14 - SNDRV_PCM_FORMAT_FLOAT_LE */ |
| 45 | PCM_FORMAT_INVALID, /* 15 - SNDRV_PCM_FORMAT_FLOAT_BE */ |
| 46 | PCM_FORMAT_INVALID, /* 16 - SNDRV_PCM_FORMAT_FLOAT64_LE */ |
| 47 | PCM_FORMAT_INVALID, /* 17 - SNDRV_PCM_FORMAT_FLOAT64_BE */ |
| 48 | PCM_FORMAT_INVALID, /* 18 - SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE */ |
| 49 | PCM_FORMAT_INVALID, /* 19 - SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE */ |
| 50 | PCM_FORMAT_INVALID, /* 20 - SNDRV_PCM_FORMAT_MU_LAW */ |
| 51 | PCM_FORMAT_INVALID, /* 21 - SNDRV_PCM_FORMAT_A_LAW */ |
| 52 | PCM_FORMAT_INVALID, /* 22 - SNDRV_PCM_FORMAT_IMA_ADPCM */ |
| 53 | PCM_FORMAT_INVALID, /* 23 - SNDRV_PCM_FORMAT_MPEG */ |
| 54 | PCM_FORMAT_INVALID, /* 24 - SNDRV_PCM_FORMAT_GSM */ |
| 55 | PCM_FORMAT_INVALID, /* 25 -> 30 (not assigned) */ |
| 56 | PCM_FORMAT_INVALID, |
| 57 | PCM_FORMAT_INVALID, |
| 58 | PCM_FORMAT_INVALID, |
| 59 | PCM_FORMAT_INVALID, |
| 60 | PCM_FORMAT_INVALID, |
| 61 | PCM_FORMAT_INVALID, /* 31 - SNDRV_PCM_FORMAT_SPECIAL */ |
Paul McLean | 9529ade | 2015-05-19 08:06:39 -0700 | [diff] [blame] | 62 | PCM_FORMAT_S24_3LE, /* 32 - SNDRV_PCM_FORMAT_S24_3LE */ |
Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 63 | PCM_FORMAT_INVALID, /* 33 - SNDRV_PCM_FORMAT_S24_3BE */ |
| 64 | PCM_FORMAT_INVALID, /* 34 - SNDRV_PCM_FORMAT_U24_3LE */ |
| 65 | PCM_FORMAT_INVALID, /* 35 - SNDRV_PCM_FORMAT_U24_3BE */ |
| 66 | PCM_FORMAT_INVALID, /* 36 - SNDRV_PCM_FORMAT_S20_3LE */ |
| 67 | PCM_FORMAT_INVALID, /* 37 - SNDRV_PCM_FORMAT_S20_3BE */ |
| 68 | PCM_FORMAT_INVALID, /* 38 - SNDRV_PCM_FORMAT_U20_3LE */ |
| 69 | PCM_FORMAT_INVALID, /* 39 - SNDRV_PCM_FORMAT_U20_3BE */ |
| 70 | PCM_FORMAT_INVALID, /* 40 - SNDRV_PCM_FORMAT_S18_3LE */ |
| 71 | PCM_FORMAT_INVALID, /* 41 - SNDRV_PCM_FORMAT_S18_3BE */ |
| 72 | PCM_FORMAT_INVALID, /* 42 - SNDRV_PCM_FORMAT_U18_3LE */ |
| 73 | PCM_FORMAT_INVALID, /* 43 - SNDRV_PCM_FORMAT_U18_3BE */ |
| 74 | PCM_FORMAT_INVALID, /* 44 - SNDRV_PCM_FORMAT_G723_24 */ |
| 75 | PCM_FORMAT_INVALID, /* 45 - SNDRV_PCM_FORMAT_G723_24_1B */ |
| 76 | PCM_FORMAT_INVALID, /* 46 - SNDRV_PCM_FORMAT_G723_40 */ |
| 77 | PCM_FORMAT_INVALID, /* 47 - SNDRV_PCM_FORMAT_G723_40_1B */ |
| 78 | PCM_FORMAT_INVALID, /* 48 - SNDRV_PCM_FORMAT_DSD_U8 */ |
| 79 | PCM_FORMAT_INVALID /* 49 - SNDRV_PCM_FORMAT_DSD_U16_LE */ |
| 80 | }; |
| 81 | |
| 82 | /* |
| 83 | * Scans the provided format mask and returns the first non-8 bit sample |
| 84 | * format supported by the devices. |
| 85 | */ |
| 86 | enum pcm_format get_pcm_format_for_mask(struct pcm_mask* mask) |
| 87 | { |
| 88 | int num_slots = ARRAY_SIZE(mask->bits); |
| 89 | int bits_per_slot = sizeof(mask->bits[0]) * 8; |
| 90 | |
| 91 | int table_size = ARRAY_SIZE(pcm_format_value_map); |
| 92 | |
| 93 | int slot_index, bit_index, table_index; |
| 94 | table_index = 0; |
Paul McLean | 98ca8d4 | 2015-01-13 09:41:36 -0800 | [diff] [blame] | 95 | for (slot_index = 0; slot_index < num_slots && table_index < table_size; slot_index++) { |
| 96 | unsigned bit_mask = 1; |
| 97 | for (bit_index = 0; bit_index < bits_per_slot && table_index < table_size; bit_index++) { |
| 98 | /* skip any 8-bit formats */ |
| 99 | if (table_index >= 2 && (mask->bits[slot_index] & bit_mask) != 0) { |
| 100 | /* just return the first one which will be at least 16-bit */ |
| 101 | return (int)pcm_format_value_map[table_index]; |
| 102 | } |
| 103 | bit_mask <<= 1; |
| 104 | table_index++; |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | return PCM_FORMAT_INVALID; |
| 109 | } |