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annotate semiconginev2/old/resources/audio.nim @ 1235:c70fee6568f6

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did: improv render tests to run without user input
author sam <sam@basx.dev>
date Sat, 20 Jul 2024 15:45:02 +0700
parents 56781cc0fc7c
children
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1 import std/os
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2 import std/streams
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3 import std/strformat
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4 import std/endians
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5
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6 import ../core/audiotypes
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7
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8 type
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9 Encoding {.size: sizeof(uint32).} = enum
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10 # Unspecified = 0
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11 # Uint8Ulaw = 1
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12 # Int8 = 2
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13 Int16 = 3
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14 # Int24 = 4
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15 # Int32 = 5
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16 # Float32 = 6
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17 # Float64 = 7
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18
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19 AuHeader = object
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20 magicNumber: uint32
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21 dataOffset: uint32
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22 dataSize: uint32
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23 encoding: Encoding
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24 sampleRate: uint32
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25 channels: uint32
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26
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27 proc readSample(stream: Stream, encoding: Encoding, channels: int): Sample =
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28 result[0] = stream.readint16()
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29 swapEndian16(addr result[0], addr result[0])
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30
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31 if channels == 2:
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32 result[1] = stream.readint16()
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33 swapEndian16(addr result[1], addr result[1])
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34 else:
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35 result[1] = result[0]
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36
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37 # https://en.wikipedia.org/wiki/Au_file_format
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38 proc ReadAU*(stream: Stream): Sound =
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39 var header: AuHeader
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40
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41 for name, value in fieldPairs(header):
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42 var bytes: array[4, uint8]
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43 stream.read(bytes)
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44 swap(bytes[0], bytes[3])
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45 swap(bytes[1], bytes[2])
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46 value = cast[typeof(value)](bytes)
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47
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48 assert header.magicNumber == 0x2e736e64
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49 if header.sampleRate != AUDIO_SAMPLE_RATE:
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50 raise newException(Exception, &"Only support sample rate of {AUDIO_SAMPLE_RATE} Hz but got {header.sampleRate} Hz, please resample (e.g. ffmpeg -i <infile> -ar {AUDIO_SAMPLE_RATE} <outfile>)")
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51 if not (header.channels in [1'u32, 2'u32]):
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52 raise newException(Exception, "Only support mono and stereo audio at the moment (1 or 2 channels), but found " & $header.channels)
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53
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54 var annotation: string
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55 stream.read(annotation)
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56
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57 result = new Sound
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58 stream.setPosition(int(header.dataOffset))
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59 while not stream.atEnd():
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60 result[].add stream.readSample(header.encoding, int(header.channels))
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61
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62 {.compile: currentSourcePath.parentDir() & "/stb_vorbis.c".}
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63
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64 proc stb_vorbis_decode_memory(mem: pointer, len: cint, channels: ptr cint, sample_rate: ptr cint, output: ptr ptr cshort): cint {.importc.}
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65 proc free(p: pointer) {.importc.}
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66
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67 proc ReadVorbis*(stream: Stream): Sound =
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68 var
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69 data = stream.readAll()
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70 channels: cint
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71 sampleRate: cint
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72 output: ptr cshort
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73
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74 var nSamples = stb_vorbis_decode_memory(addr data[0], cint(data.len), addr channels, addr sampleRate, addr output)
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75
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76 if nSamples < 0:
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77 raise newException(Exception, &"Unable to read ogg/vorbis sound file, error code: {nSamples}")
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78 if sampleRate != AUDIO_SAMPLE_RATE:
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79 raise newException(Exception, &"Only support sample rate of {AUDIO_SAMPLE_RATE} Hz but got {sampleRate} Hz, please resample (e.g. ffmpeg -i <infile> -acodec libvorbis -ar {AUDIO_SAMPLE_RATE} <outfile>)")
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80
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81 result = new Sound
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82 if channels == 2:
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83 result[].setLen(int(nSamples))
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84 copyMem(addr result[][0], output, nSamples * sizeof(Sample))
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85 free(output)
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86 elif channels == 1:
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87 for i in 0 ..< nSamples:
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88 let value = cast[ptr UncheckedArray[int16]](output)[i]
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89 result[].add [value, value]
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90 free(output)
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91 else:
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92 free(output)
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93 raise newException(Exception, "Only support mono and stereo audio at the moment (1 or 2 channels), but found " & $channels)