diff options
| author | 3gg <3gg@shellblade.net> | 2025-12-27 12:03:39 -0800 |
|---|---|---|
| committer | 3gg <3gg@shellblade.net> | 2025-12-27 12:03:39 -0800 |
| commit | 5a079a2d114f96d4847d1ee305d5b7c16eeec50e (patch) | |
| tree | 8926ab44f168acf787d8e19608857b3af0f82758 /contrib/SDL-3.2.8/src/audio/SDL_wave.h | |
Initial commit
Diffstat (limited to 'contrib/SDL-3.2.8/src/audio/SDL_wave.h')
| -rw-r--r-- | contrib/SDL-3.2.8/src/audio/SDL_wave.h | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/contrib/SDL-3.2.8/src/audio/SDL_wave.h b/contrib/SDL-3.2.8/src/audio/SDL_wave.h new file mode 100644 index 0000000..0ec8965 --- /dev/null +++ b/contrib/SDL-3.2.8/src/audio/SDL_wave.h | |||
| @@ -0,0 +1,151 @@ | |||
| 1 | /* | ||
| 2 | Simple DirectMedia Layer | ||
| 3 | Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org> | ||
| 4 | |||
| 5 | This software is provided 'as-is', without any express or implied | ||
| 6 | warranty. In no event will the authors be held liable for any damages | ||
| 7 | arising from the use of this software. | ||
| 8 | |||
| 9 | Permission is granted to anyone to use this software for any purpose, | ||
| 10 | including commercial applications, and to alter it and redistribute it | ||
| 11 | freely, subject to the following restrictions: | ||
| 12 | |||
| 13 | 1. The origin of this software must not be misrepresented; you must not | ||
| 14 | claim that you wrote the original software. If you use this software | ||
| 15 | in a product, an acknowledgment in the product documentation would be | ||
| 16 | appreciated but is not required. | ||
| 17 | 2. Altered source versions must be plainly marked as such, and must not be | ||
| 18 | misrepresented as being the original software. | ||
| 19 | 3. This notice may not be removed or altered from any source distribution. | ||
| 20 | */ | ||
| 21 | #include "SDL_internal.h" | ||
| 22 | |||
| 23 | // RIFF WAVE files are little-endian | ||
| 24 | |||
| 25 | /*******************************************/ | ||
| 26 | // Define values for Microsoft WAVE format | ||
| 27 | /*******************************************/ | ||
| 28 | // FOURCC | ||
| 29 | #define RIFF 0x46464952 // "RIFF" | ||
| 30 | #define WAVE 0x45564157 // "WAVE" | ||
| 31 | #define FACT 0x74636166 // "fact" | ||
| 32 | #define LIST 0x5453494c // "LIST" | ||
| 33 | #define BEXT 0x74786562 // "bext" | ||
| 34 | #define JUNK 0x4B4E554A // "JUNK" | ||
| 35 | #define FMT 0x20746D66 // "fmt " | ||
| 36 | #define DATA 0x61746164 // "data" | ||
| 37 | // Format tags | ||
| 38 | #define UNKNOWN_CODE 0x0000 | ||
| 39 | #define PCM_CODE 0x0001 | ||
| 40 | #define MS_ADPCM_CODE 0x0002 | ||
| 41 | #define IEEE_FLOAT_CODE 0x0003 | ||
| 42 | #define ALAW_CODE 0x0006 | ||
| 43 | #define MULAW_CODE 0x0007 | ||
| 44 | #define IMA_ADPCM_CODE 0x0011 | ||
| 45 | #define MPEG_CODE 0x0050 | ||
| 46 | #define MPEGLAYER3_CODE 0x0055 | ||
| 47 | #define EXTENSIBLE_CODE 0xFFFE | ||
| 48 | |||
| 49 | // Stores the WAVE format information. | ||
| 50 | typedef struct WaveFormat | ||
| 51 | { | ||
| 52 | Uint16 formattag; // Raw value of the first field in the fmt chunk data. | ||
| 53 | Uint16 encoding; // Actual encoding, possibly from the extensible header. | ||
| 54 | Uint16 channels; // Number of channels. | ||
| 55 | Uint32 frequency; // Sampling rate in Hz. | ||
| 56 | Uint32 byterate; // Average bytes per second. | ||
| 57 | Uint16 blockalign; // Bytes per block. | ||
| 58 | Uint16 bitspersample; // Currently supported are 8, 16, 24, 32, and 4 for ADPCM. | ||
| 59 | |||
| 60 | /* Extra information size. Number of extra bytes starting at byte 18 in the | ||
| 61 | * fmt chunk data. This is at least 22 for the extensible header. | ||
| 62 | */ | ||
| 63 | Uint16 extsize; | ||
| 64 | |||
| 65 | // Extensible WAVE header fields | ||
| 66 | Uint16 validsamplebits; | ||
| 67 | Uint32 samplesperblock; // For compressed formats. Can be zero. Actually 16 bits in the header. | ||
| 68 | Uint32 channelmask; | ||
| 69 | Uint8 subformat[16]; // A format GUID. | ||
| 70 | } WaveFormat; | ||
| 71 | |||
| 72 | // Stores information on the fact chunk. | ||
| 73 | typedef struct WaveFact | ||
| 74 | { | ||
| 75 | /* Represents the state of the fact chunk in the WAVE file. | ||
| 76 | * Set to -1 if the fact chunk is invalid. | ||
| 77 | * Set to 0 if the fact chunk is not present | ||
| 78 | * Set to 1 if the fact chunk is present and valid. | ||
| 79 | * Set to 2 if samplelength is going to be used as the number of sample frames. | ||
| 80 | */ | ||
| 81 | Sint32 status; | ||
| 82 | |||
| 83 | /* Version 1 of the RIFF specification calls the field in the fact chunk | ||
| 84 | * dwFileSize. The Standards Update then calls it dwSampleLength and specifies | ||
| 85 | * that it is 'the length of the data in samples'. WAVE files from Windows | ||
| 86 | * with this chunk have it set to the samples per channel (sample frames). | ||
| 87 | * This is useful to truncate compressed audio to a specific sample count | ||
| 88 | * because a compressed block is usually decoded to a fixed number of | ||
| 89 | * sample frames. | ||
| 90 | */ | ||
| 91 | Uint32 samplelength; // Raw sample length value from the fact chunk. | ||
| 92 | } WaveFact; | ||
| 93 | |||
| 94 | // Generic struct for the chunks in the WAVE file. | ||
| 95 | typedef struct WaveChunk | ||
| 96 | { | ||
| 97 | Uint32 fourcc; // FOURCC of the chunk. | ||
| 98 | Uint32 length; // Size of the chunk data. | ||
| 99 | Sint64 position; // Position of the data in the stream. | ||
| 100 | Uint8 *data; // When allocated, this points to the chunk data. length is used for the memory allocation size. | ||
| 101 | size_t size; // Number of bytes in data that could be read from the stream. Can be smaller than length. | ||
| 102 | } WaveChunk; | ||
| 103 | |||
| 104 | // Controls how the size of the RIFF chunk affects the loading of a WAVE file. | ||
| 105 | typedef enum WaveRiffSizeHint | ||
| 106 | { | ||
| 107 | RiffSizeNoHint, | ||
| 108 | RiffSizeForce, | ||
| 109 | RiffSizeIgnoreZero, | ||
| 110 | RiffSizeIgnore, | ||
| 111 | RiffSizeMaximum | ||
| 112 | } WaveRiffSizeHint; | ||
| 113 | |||
| 114 | // Controls how a truncated WAVE file is handled. | ||
| 115 | typedef enum WaveTruncationHint | ||
| 116 | { | ||
| 117 | TruncNoHint, | ||
| 118 | TruncVeryStrict, | ||
| 119 | TruncStrict, | ||
| 120 | TruncDropFrame, | ||
| 121 | TruncDropBlock | ||
| 122 | } WaveTruncationHint; | ||
| 123 | |||
| 124 | // Controls how the fact chunk affects the loading of a WAVE file. | ||
| 125 | typedef enum WaveFactChunkHint | ||
| 126 | { | ||
| 127 | FactNoHint, | ||
| 128 | FactTruncate, | ||
| 129 | FactStrict, | ||
| 130 | FactIgnoreZero, | ||
| 131 | FactIgnore | ||
| 132 | } WaveFactChunkHint; | ||
| 133 | |||
| 134 | typedef struct WaveFile | ||
| 135 | { | ||
| 136 | WaveChunk chunk; | ||
| 137 | WaveFormat format; | ||
| 138 | WaveFact fact; | ||
| 139 | |||
| 140 | /* Number of sample frames that will be decoded. Calculated either with the | ||
| 141 | * size of the data chunk or, if the appropriate hint is enabled, with the | ||
| 142 | * sample length value from the fact chunk. | ||
| 143 | */ | ||
| 144 | Sint64 sampleframes; | ||
| 145 | |||
| 146 | void *decoderdata; // Some decoders require extra data for a state. | ||
| 147 | |||
| 148 | WaveRiffSizeHint riffhint; | ||
| 149 | WaveTruncationHint trunchint; | ||
| 150 | WaveFactChunkHint facthint; | ||
| 151 | } WaveFile; | ||
