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/*
* 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_format"
/*#define LOG_NDEBUG 0*/
#include "include/alsa_format.h"
#include <tinyalsa/asoundlib.h>
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
/*
* Maps from bit position in pcm_mask to PCM_ format constants.
*/
int8_t const pcm_format_value_map[50] = {
PCM_FORMAT_S8, /* 00 - SNDRV_PCM_FORMAT_S8 */
PCM_FORMAT_INVALID, /* 01 - SNDRV_PCM_FORMAT_U8 */
PCM_FORMAT_S16_LE, /* 02 - SNDRV_PCM_FORMAT_S16_LE */
PCM_FORMAT_INVALID, /* 03 - SNDRV_PCM_FORMAT_S16_BE */
PCM_FORMAT_INVALID, /* 04 - SNDRV_PCM_FORMAT_U16_LE */
PCM_FORMAT_INVALID, /* 05 - SNDRV_PCM_FORMAT_U16_BE */
PCM_FORMAT_S24_LE, /* 06 - SNDRV_PCM_FORMAT_S24_LE */
PCM_FORMAT_INVALID, /* 07 - SNDRV_PCM_FORMAT_S24_BE */
PCM_FORMAT_INVALID, /* 08 - SNDRV_PCM_FORMAT_U24_LE */
PCM_FORMAT_INVALID, /* 09 - SNDRV_PCM_FORMAT_U24_BE */
PCM_FORMAT_S32_LE, /* 10 - SNDRV_PCM_FORMAT_S32_LE */
PCM_FORMAT_INVALID, /* 11 - SNDRV_PCM_FORMAT_S32_BE */
PCM_FORMAT_INVALID, /* 12 - SNDRV_PCM_FORMAT_U32_LE */
PCM_FORMAT_INVALID, /* 13 - SNDRV_PCM_FORMAT_U32_BE */
PCM_FORMAT_INVALID, /* 14 - SNDRV_PCM_FORMAT_FLOAT_LE */
PCM_FORMAT_INVALID, /* 15 - SNDRV_PCM_FORMAT_FLOAT_BE */
PCM_FORMAT_INVALID, /* 16 - SNDRV_PCM_FORMAT_FLOAT64_LE */
PCM_FORMAT_INVALID, /* 17 - SNDRV_PCM_FORMAT_FLOAT64_BE */
PCM_FORMAT_INVALID, /* 18 - SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE */
PCM_FORMAT_INVALID, /* 19 - SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE */
PCM_FORMAT_INVALID, /* 20 - SNDRV_PCM_FORMAT_MU_LAW */
PCM_FORMAT_INVALID, /* 21 - SNDRV_PCM_FORMAT_A_LAW */
PCM_FORMAT_INVALID, /* 22 - SNDRV_PCM_FORMAT_IMA_ADPCM */
PCM_FORMAT_INVALID, /* 23 - SNDRV_PCM_FORMAT_MPEG */
PCM_FORMAT_INVALID, /* 24 - SNDRV_PCM_FORMAT_GSM */
PCM_FORMAT_INVALID, /* 25 -> 30 (not assigned) */
PCM_FORMAT_INVALID,
PCM_FORMAT_INVALID,
PCM_FORMAT_INVALID,
PCM_FORMAT_INVALID,
PCM_FORMAT_INVALID,
PCM_FORMAT_INVALID, /* 31 - SNDRV_PCM_FORMAT_SPECIAL */
PCM_FORMAT_S24_3LE, /* 32 - SNDRV_PCM_FORMAT_S24_3LE */
PCM_FORMAT_INVALID, /* 33 - SNDRV_PCM_FORMAT_S24_3BE */
PCM_FORMAT_INVALID, /* 34 - SNDRV_PCM_FORMAT_U24_3LE */
PCM_FORMAT_INVALID, /* 35 - SNDRV_PCM_FORMAT_U24_3BE */
PCM_FORMAT_INVALID, /* 36 - SNDRV_PCM_FORMAT_S20_3LE */
PCM_FORMAT_INVALID, /* 37 - SNDRV_PCM_FORMAT_S20_3BE */
PCM_FORMAT_INVALID, /* 38 - SNDRV_PCM_FORMAT_U20_3LE */
PCM_FORMAT_INVALID, /* 39 - SNDRV_PCM_FORMAT_U20_3BE */
PCM_FORMAT_INVALID, /* 40 - SNDRV_PCM_FORMAT_S18_3LE */
PCM_FORMAT_INVALID, /* 41 - SNDRV_PCM_FORMAT_S18_3BE */
PCM_FORMAT_INVALID, /* 42 - SNDRV_PCM_FORMAT_U18_3LE */
PCM_FORMAT_INVALID, /* 43 - SNDRV_PCM_FORMAT_U18_3BE */
PCM_FORMAT_INVALID, /* 44 - SNDRV_PCM_FORMAT_G723_24 */
PCM_FORMAT_INVALID, /* 45 - SNDRV_PCM_FORMAT_G723_24_1B */
PCM_FORMAT_INVALID, /* 46 - SNDRV_PCM_FORMAT_G723_40 */
PCM_FORMAT_INVALID, /* 47 - SNDRV_PCM_FORMAT_G723_40_1B */
PCM_FORMAT_INVALID, /* 48 - SNDRV_PCM_FORMAT_DSD_U8 */
PCM_FORMAT_INVALID /* 49 - SNDRV_PCM_FORMAT_DSD_U16_LE */
};
/*
* Scans the provided format mask and returns the first non-8 bit sample
* format supported by the devices.
*/
enum pcm_format get_pcm_format_for_mask(struct pcm_mask* mask)
{
int num_slots = ARRAY_SIZE(mask->bits);
int bits_per_slot = sizeof(mask->bits[0]) * 8;
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++) {
/* skip any 8-bit formats */
if (table_index >= 2 && (mask->bits[slot_index] & bit_mask) != 0) {
/* just return the first one which will be at least 16-bit */
return (int)pcm_format_value_map[table_index];
}
bit_mask <<= 1;
table_index++;
}
}
return PCM_FORMAT_INVALID;
}
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