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 */ 36 PCM_FORMAT_S24_LE, /* 06 - SNDRV_PCM_FORMAT_S24_LE */ 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 */ 62 PCM_FORMAT_S24_3LE, /* 32 - SNDRV_PCM_FORMAT_S24_3LE */ 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; 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 } 110