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Annotation of nono/host/sounddriver_alsa.cpp, revision 1.1

1.1     ! root        1: //
        !             2: // nono
        !             3: // Copyright (C) 2025 nono project
        !             4: // Licensed under nono-license.txt
        !             5: //
        !             6: 
        !             7: //
        !             8: // サウンドの ALSA ドライバ
        !             9: //
        !            10: 
        !            11: #include "sounddriver_alsa.h"
        !            12: #include "config.h"
        !            13: #include "mainapp.h"
        !            14: #include "sound.h"
        !            15: #include <alsa/asoundlib.h>
        !            16: 
        !            17: // コンストラクタ
        !            18: SoundDriverALSA::SoundDriverALSA(HostDevice *hostdev_)
        !            19:        : inherited(hostdev_, "alsa")
        !            20: {
        !            21: }
        !            22: 
        !            23: // デストラクタ
        !            24: SoundDriverALSA::~SoundDriverALSA()
        !            25: {
        !            26:        Close();
        !            27: }
        !            28: 
        !            29: bool
        !            30: SoundDriverALSA::InitDriver(bool startup)
        !            31: {
        !            32:        snd_pcm_hw_params_t *params;
        !            33:        bool rv = false;
        !            34: 
        !            35:        if (inherited::InitDriver(startup) == false) {
        !            36:                return false;
        !            37:        }
        !            38: 
        !            39:        const ConfigItem& item = gConfig->Find("hostsound-alsa-device");
        !            40:        device = item.AsString();
        !            41: 
        !            42:        if (snd_pcm_open(&pcm, device.c_str(), SND_PCM_STREAM_PLAYBACK, 0) < 0) {
        !            43:                warnx("%s: snd_pcm_open(%s) failed", __method__, device.c_str());
        !            44:                return false;
        !            45:        }
        !            46: 
        !            47:        uint period = freq * Sound::BLK_NSEC / 1_sec;
        !            48: 
        !            49:        snd_pcm_hw_params_malloc(&params);
        !            50:        snd_pcm_hw_params_any(pcm, params);
        !            51:        snd_pcm_hw_params_set_format(pcm, params, SND_PCM_FORMAT_S16);//HostEndian
        !            52:        snd_pcm_hw_params_set_access(pcm, params, SND_PCM_ACCESS_RW_INTERLEAVED);
        !            53:        snd_pcm_hw_params_set_channels(pcm, params, Sound::NCHAN);
        !            54:        snd_pcm_hw_params_set_rate(pcm, params, freq, 0);
        !            55:        snd_pcm_hw_params_set_period_size(pcm, params, period, 0);
        !            56:        snd_pcm_hw_params_set_buffer_size(pcm, params, period * 4);
        !            57:        if (snd_pcm_hw_params(pcm, params) < 0) {
        !            58:                warnx("%s: snd_pcm_hw_params() failed", __method__);
        !            59:                goto done;
        !            60:        }
        !            61: 
        !            62:        rv = true;
        !            63:  done:
        !            64:        snd_pcm_hw_params_free(params);
        !            65:        return rv;
        !            66: }
        !            67: 
        !            68: // ブロック書き出し
        !            69: void
        !            70: SoundDriverALSA::Write(const int16 *blk)
        !            71: {
        !            72:        size_t frames_per_blk = blkbytes / Sound::FRAME_BYTES;
        !            73: 
        !            74:        // ALSA では書き込みはフレーム単位で、一度に行う志向。
        !            75:        snd_pcm_prepare(pcm);
        !            76:        auto r = snd_pcm_writei(pcm, blk, frames_per_blk);
        !            77:        if (r < 0) {
        !            78:                warnx("%s: snd_pcm_writei() failed: %d", __method__, (int)r);
        !            79:                snd_pcm_prepare(pcm);
        !            80:                if (r == -EPIPE) {
        !            81:                        // 一度だけ再試行してみる?
        !            82:                        snd_pcm_writei(pcm, blk, frames_per_blk);
        !            83:                }
        !            84:        }
        !            85: }
        !            86: 
        !            87: void
        !            88: SoundDriverALSA::Close()
        !            89: {
        !            90:        snd_pcm_drain(pcm);
        !            91:        snd_pcm_close(pcm);
        !            92: }
        !            93: 
        !            94: void
        !            95: SoundDriverALSA::MonitorUpdateMD(TextScreen& screen, int y)
        !            96: {
        !            97:        screen.Print(0, y, "Device:           %s", device.c_str());
        !            98: }

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