| Andy Hung | d4752ab | 2014-03-27 15:12:59 -0700 | [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 | /* This file contains shared utility functions to handle the tinyalsa |
| 18 | * implementation for Android internal audio, generally in the hardware layer. |
| 19 | * Some routines may log a fatal error on failure, as noted. |
| 20 | */ |
| 21 | |
| 22 | #ifndef ANDROID_AUDIO_ALSAOPS_H |
| 23 | #define ANDROID_AUDIO_ALSAOPS_H |
| 24 | |
| 25 | #include <cutils/log.h> |
| 26 | #include <system/audio.h> |
| 27 | #include <tinyalsa/asoundlib.h> |
| 28 | |
| 29 | __BEGIN_DECLS |
| 30 | |
| 31 | /* Converts audio_format to pcm_format. |
| 32 | * Parameters: |
| 33 | * format the audio_format_t to convert |
| 34 | * |
| 35 | * Logs a fatal error if format is not a valid convertible audio_format_t. |
| 36 | */ |
| 37 | static inline enum pcm_format pcm_format_from_audio_format(audio_format_t format) |
| 38 | { |
| 39 | switch (format) { |
| 40 | #ifdef HAVE_BIG_ENDIAN |
| 41 | case AUDIO_FORMAT_PCM_16_BIT: |
| 42 | return PCM_FORMAT_S16_BE; |
| 43 | case AUDIO_FORMAT_PCM_24_BIT_PACKED: |
| 44 | return PCM_FORMAT_S24_3BE; |
| 45 | case AUDIO_FORMAT_PCM_32_BIT: |
| 46 | return PCM_FORMAT_S32_BE; |
| 47 | case AUDIO_FORMAT_PCM_8_24_BIT: |
| 48 | return PCM_FORMAT_S24_BE; |
| 49 | #else |
| 50 | case AUDIO_FORMAT_PCM_16_BIT: |
| 51 | return PCM_FORMAT_S16_LE; |
| 52 | case AUDIO_FORMAT_PCM_24_BIT_PACKED: |
| 53 | return PCM_FORMAT_S24_3LE; |
| 54 | case AUDIO_FORMAT_PCM_32_BIT: |
| 55 | return PCM_FORMAT_S32_LE; |
| 56 | case AUDIO_FORMAT_PCM_8_24_BIT: |
| 57 | return PCM_FORMAT_S24_LE; |
| 58 | #endif |
| 59 | case AUDIO_FORMAT_PCM_FLOAT: /* there is no equivalent for float */ |
| 60 | default: |
| 61 | LOG_ALWAYS_FATAL("pcm_format_from_audio_format: invalid audio format %#x", format); |
| 62 | return 0; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | /* Converts pcm_format to audio_format. |
| 67 | * Parameters: |
| 68 | * format the pcm_format to convert |
| 69 | * |
| 70 | * Logs a fatal error if format is not a valid convertible pcm_format. |
| 71 | */ |
| 72 | static inline audio_format_t audio_format_from_pcm_format(enum pcm_format format) |
| 73 | { |
| 74 | switch (format) { |
| 75 | #ifdef HAVE_BIG_ENDIAN |
| 76 | case PCM_FORMAT_S16_BE: |
| 77 | return AUDIO_FORMAT_PCM_16_BIT; |
| 78 | case PCM_FORMAT_S24_3BE: |
| 79 | return AUDIO_FORMAT_PCM_24_BIT_PACKED; |
| 80 | case PCM_FORMAT_S24_BE: |
| 81 | return AUDIO_FORMAT_PCM_8_24_BIT; |
| 82 | case PCM_FORMAT_S32_BE: |
| 83 | return AUDIO_FORMAT_PCM_32_BIT; |
| 84 | #else |
| 85 | case PCM_FORMAT_S16_LE: |
| 86 | return AUDIO_FORMAT_PCM_16_BIT; |
| 87 | case PCM_FORMAT_S24_3LE: |
| 88 | return AUDIO_FORMAT_PCM_24_BIT_PACKED; |
| 89 | case PCM_FORMAT_S24_LE: |
| 90 | return AUDIO_FORMAT_PCM_8_24_BIT; |
| 91 | case PCM_FORMAT_S32_LE: |
| 92 | return AUDIO_FORMAT_PCM_32_BIT; |
| 93 | #endif |
| 94 | default: |
| 95 | LOG_ALWAYS_FATAL("audio_format_from_pcm_format: invalid pcm format %#x", format); |
| 96 | return 0; |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | __END_DECLS |
| 101 | |
| 102 | #endif /* ANDROID_AUDIO_ALSAOPS_H */ |