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annotate semiconginev2/audio/platform/linux.nim @ 1224:a3fa15c25026 compiletime-tests

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did: cleanup, add audio, change platform-dependent structure
author sam <sam@basx.dev>
date Wed, 17 Jul 2024 22:02:11 +0700
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Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1224
a3fa15c25026 did: cleanup, add audio, change platform-dependent structure
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1 # alsa API
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2 type
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3 OpenMode*{.size: sizeof(culong).} = enum
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4 SND_PCM_BLOCK = 0x00000000 # added by semicongine, for clarity
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5 SND_PCM_NONBLOCK = 0x00000001
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6 StreamMode* {.size: sizeof(cint).} = enum
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7 SND_PCM_STREAM_PLAYBACK = 0
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8 AccessMode*{.size: sizeof(cint).} = enum
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9 SND_PCM_ACCESS_RW_INTERLEAVED = 3
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10 PCMFormat*{.size: sizeof(cint).} = enum
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11 SND_PCM_FORMAT_S16_LE = 2
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12 snd_pcm_p* = ptr object
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13 snd_pcm_hw_params_p* = ptr object
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14 snd_pcm_uframes_t* = culong
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15 snd_pcm_sframes_t* = clong
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16 {.pragma: alsafunc, importc, cdecl, dynlib: "libasound.so.2".}
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17 proc snd_pcm_open*(pcm_ref: ptr snd_pcm_p, name: cstring, streamMode: StreamMode, openmode: OpenMode): cint {.alsafunc.}
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18 proc snd_pcm_close*(pcm: snd_pcm_p): cint {.alsafunc.}
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19 proc snd_pcm_hw_params_malloc*(hw_params_ptr: ptr snd_pcm_hw_params_p): cint {.alsafunc.}
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20 proc snd_pcm_hw_params_free*(hw_params: snd_pcm_hw_params_p) {.alsafunc.}
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21 proc snd_pcm_hw_params_any*(pcm: snd_pcm_p, params: snd_pcm_hw_params_p): cint {.alsafunc.}
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22 proc snd_pcm_hw_params_set_access*(pcm: snd_pcm_p, params: snd_pcm_hw_params_p, mode: AccessMode): cint {.alsafunc.}
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23 proc snd_pcm_hw_params_set_format*(pcm: snd_pcm_p, params: snd_pcm_hw_params_p, format: PCMFormat): cint {.alsafunc.}
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24 proc snd_pcm_hw_params_set_channels*(pcm: snd_pcm_p, params: snd_pcm_hw_params_p, val: cuint): cint {.alsafunc.}
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25 proc snd_pcm_hw_params_set_buffer_size*(pcm: snd_pcm_p, params: snd_pcm_hw_params_p, size: snd_pcm_uframes_t): cint {.alsafunc.}
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26 proc snd_pcm_hw_params_set_rate*(pcm: snd_pcm_p, params: snd_pcm_hw_params_p, val: cuint, dir: cint): cint {.alsafunc.}
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27 proc snd_pcm_hw_params*(pcm: snd_pcm_p, params: snd_pcm_hw_params_p): cint {.alsafunc.}
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28 proc snd_pcm_writei*(pcm: snd_pcm_p, buffer: pointer, size: snd_pcm_uframes_t): snd_pcm_sframes_t {.alsafunc.}
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29 proc snd_pcm_recover*(pcm: snd_pcm_p, err: cint, silent: cint): cint {.alsafunc.}
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30
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31 template checkAlsaResult(call: untyped) =
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32 let value = call
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33 if value < 0:
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34 raise newException(Exception, "Alsa error: " & astToStr(call) &
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35 " returned " & $value)
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36
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37 # required for engine:
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38
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39 type
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40 NativeSoundDevice* = object
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41 handle: snd_pcm_p
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42 buffers: seq[ptr SoundData]
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43
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44 proc OpenSoundDevice*(sampleRate: uint32, buffers: seq[ptr SoundData]): NativeSoundDevice =
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45 var hw_params: snd_pcm_hw_params_p = nil
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46 checkAlsaResult snd_pcm_open(addr result.handle, "default", SND_PCM_STREAM_PLAYBACK, SND_PCM_BLOCK)
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47
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48 # hw parameters, quiet a bit of hardcoding here
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49 checkAlsaResult snd_pcm_hw_params_malloc(addr hw_params)
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50 checkAlsaResult snd_pcm_hw_params_any(result.handle, hw_params)
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51 checkAlsaResult snd_pcm_hw_params_set_access(result.handle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)
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52 checkAlsaResult snd_pcm_hw_params_set_format(result.handle, hw_params, SND_PCM_FORMAT_S16_LE)
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53 checkAlsaResult snd_pcm_hw_params_set_rate(result.handle, hw_params, sampleRate, 0)
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54 checkAlsaResult snd_pcm_hw_params_set_channels(result.handle, hw_params, 2)
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55 checkAlsaResult snd_pcm_hw_params_set_buffer_size(result.handle, hw_params, snd_pcm_uframes_t(buffers[0][].len))
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56 checkAlsaResult snd_pcm_hw_params(result.handle, hw_params)
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57 snd_pcm_hw_params_free(hw_params)
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58 result.buffers = buffers
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59
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60 proc WriteSoundData*(soundDevice: NativeSoundDevice, buffer: int) =
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61 var ret = snd_pcm_writei(soundDevice.handle, addr soundDevice.buffers[buffer][][0], snd_pcm_uframes_t(soundDevice.buffers[buffer][].len))
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62 if ret < 0:
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63 checkAlsaResult snd_pcm_recover(soundDevice.handle, cint(ret), 0)
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64
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65 proc CloseSoundDevice*(soundDevice: NativeSoundDevice) =
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66 discard snd_pcm_close(soundDevice.handle)