1 /* 2 * Copyright (c) 2011 Apple Inc. All rights reserved. 3 * 4 * @APPLE_APACHE_LICENSE_HEADER_START@ 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 * 18 * @APPLE_APACHE_LICENSE_HEADER_END@ 19 */ 20 21 /* 22 File: ALACAudioTypes.h 23 */ 24 25 #ifndef ALACAUDIOTYPES_H 26 #define ALACAUDIOTYPES_H 27 28 #if PRAGMA_ONCE 29 #pragma once 30 #endif 31 32 #ifdef __cplusplus 33 extern "C" { 34 #endif 35 36 #if PRAGMA_STRUCT_ALIGN 37 #pragma options align=mac68k 38 #elif PRAGMA_STRUCT_PACKPUSH 39 #pragma pack(push, 2) 40 #elif PRAGMA_STRUCT_PACK 41 #pragma pack(2) 42 #endif 43 44 #include <stdint.h> 45 46 #if defined(__ppc__) 47 #define TARGET_RT_BIG_ENDIAN 1 48 #elif defined(__ppc64__) 49 #define TARGET_RT_BIG_ENDIAN 1 50 #endif 51 52 #define kChannelAtomSize 12 53 54 enum 55 { 56 kALAC_UnimplementedError = -4, 57 kALAC_FileNotFoundError = -43, 58 kALAC_ParamError = -50, 59 kALAC_MemFullError = -108 60 }; 61 62 enum 63 { 64 kALACFormatAppleLossless = 'alac', 65 kALACFormatLinearPCM = 'lpcm' 66 }; 67 68 enum 69 { 70 kALACMaxChannels = 8, 71 kALACMaxEscapeHeaderBytes = 8, 72 kALACMaxSearches = 16, 73 kALACMaxCoefs = 16, 74 kALACDefaultFramesPerPacket = 4096 75 }; 76 77 typedef uint32_t ALACChannelLayoutTag; 78 79 enum 80 { 81 kALACFormatFlagIsFloat = (1 << 0), // 0x1 82 kALACFormatFlagIsBigEndian = (1 << 1), // 0x2 83 kALACFormatFlagIsSignedInteger = (1 << 2), // 0x4 84 kALACFormatFlagIsPacked = (1 << 3), // 0x8 85 kALACFormatFlagIsAlignedHigh = (1 << 4), // 0x10 86 }; 87 88 enum 89 { 90 #if TARGET_RT_BIG_ENDIAN 91 kALACFormatFlagsNativeEndian = kALACFormatFlagIsBigEndian 92 #else 93 kALACFormatFlagsNativeEndian = 0 94 #endif 95 }; 96 97 // this is required to be an IEEE 64bit float 98 typedef double alac_float64_t; 99 100 // These are the Channel Layout Tags used in the Channel Layout Info portion of the ALAC magic cookie 101 enum 102 { 103 kALACChannelLayoutTag_Mono = (100<<16) | 1, // C 104 kALACChannelLayoutTag_Stereo = (101<<16) | 2, // L R 105 kALACChannelLayoutTag_MPEG_3_0_B = (113<<16) | 3, // C L R 106 kALACChannelLayoutTag_MPEG_4_0_B = (116<<16) | 4, // C L R Cs 107 kALACChannelLayoutTag_MPEG_5_0_D = (120<<16) | 5, // C L R Ls Rs 108 kALACChannelLayoutTag_MPEG_5_1_D = (124<<16) | 6, // C L R Ls Rs LFE 109 kALACChannelLayoutTag_AAC_6_1 = (142<<16) | 7, // C L R Ls Rs Cs LFE 110 kALACChannelLayoutTag_MPEG_7_1_B = (127<<16) | 8 // C Lc Rc L R Ls Rs LFE (doc: IS-13818-7 MPEG2-AAC) 111 }; 112 113 // ALAC currently only utilizes these channels layouts. There is a one for one correspondance between a 114 // given number of channels and one of these layout tags 115 static const ALACChannelLayoutTag ALACChannelLayoutTags[kALACMaxChannels] = 116 { 117 kALACChannelLayoutTag_Mono, // C 118 kALACChannelLayoutTag_Stereo, // L R 119 kALACChannelLayoutTag_MPEG_3_0_B, // C L R 120 kALACChannelLayoutTag_MPEG_4_0_B, // C L R Cs 121 kALACChannelLayoutTag_MPEG_5_0_D, // C L R Ls Rs 122 kALACChannelLayoutTag_MPEG_5_1_D, // C L R Ls Rs LFE 123 kALACChannelLayoutTag_AAC_6_1, // C L R Ls Rs Cs LFE 124 kALACChannelLayoutTag_MPEG_7_1_B // C Lc Rc L R Ls Rs LFE (doc: IS-13818-7 MPEG2-AAC) 125 }; 126 127 // AudioChannelLayout from CoreAudioTypes.h. We never need the AudioChannelDescription so we remove it 128 struct ALACAudioChannelLayout 129 { 130 ALACChannelLayoutTag mChannelLayoutTag; 131 uint32_t mChannelBitmap; 132 uint32_t mNumberChannelDescriptions; 133 }; 134 typedef struct ALACAudioChannelLayout ALACAudioChannelLayout; 135 136 struct AudioFormatDescription 137 { 138 alac_float64_t mSampleRate; 139 uint32_t mFormatID; 140 uint32_t mFormatFlags; 141 uint32_t mBytesPerPacket; 142 uint32_t mFramesPerPacket; 143 uint32_t mBytesPerFrame; 144 uint32_t mChannelsPerFrame; 145 uint32_t mBitsPerChannel; 146 uint32_t mReserved; 147 }; 148 typedef struct AudioFormatDescription AudioFormatDescription; 149 150 /* Lossless Definitions */ 151 152 enum 153 { 154 kALACCodecFormat = 'alac', 155 kALACVersion = 0, 156 kALACCompatibleVersion = kALACVersion, 157 kALACDefaultFrameSize = 4096 158 }; 159 160 // note: this struct is wrapped in an 'alac' atom in the sample description extension area 161 // note: in QT movies, it will be further wrapped in a 'wave' atom surrounded by 'frma' and 'term' atoms 162 typedef struct ALACSpecificConfig 163 { 164 uint32_t frameLength; 165 uint8_t compatibleVersion; 166 uint8_t bitDepth; // max 32 167 uint8_t pb; // 0 <= pb <= 255 168 uint8_t mb; 169 uint8_t kb; 170 uint8_t numChannels; 171 uint16_t maxRun; 172 uint32_t maxFrameBytes; 173 uint32_t avgBitRate; 174 uint32_t sampleRate; 175 176 } ALACSpecificConfig; 177 178 179 // The AudioChannelLayout atom type is not exposed yet so define it here 180 enum 181 { 182 AudioChannelLayoutAID = 'chan' 183 }; 184 185 #if PRAGMA_STRUCT_ALIGN 186 #pragma options align=reset 187 #elif PRAGMA_STRUCT_PACKPUSH 188 #pragma pack(pop) 189 #elif PRAGMA_STRUCT_PACK 190 #pragma pack() 191 #endif 192 193 #ifdef __cplusplus 194 } 195 #endif 196 197 #endif /* ALACAUDIOTYPES_H */ 198