ALSA的Linux /声音-API的问题 - 你怎么静音？

问题描述

• 我如何静音使用C？是否有一个ALSA函数调用？



• 是否有任何其他函数调用/ API，这些API可以使麦克风静音？




• 我已经写了一些code做使用ALSA音频播放，声音开始播放...我怎么减少对声音回放延迟或等待时间之前，我注意到延迟？

X

解决方案

 的#include＆LT; ALSA / asoundlib.h＆GT;无效SetAlsaMasterMute（）
{
    长最小值，最大值;
    snd_mixer_t *手柄;
    snd_mixer_selem_id_t * SID;
    为const char *卡=默认;
    为const char * selem_name =大师;    snd_mixer_open（安培;手柄，0）;
    snd_mixer_attach（手柄，卡）;
    snd_mixer_selem_register（手柄，NULL，NULL）;
    snd_mixer_load（手柄）;    snd_mixer_selem_id_alloca（安培; SID）;
    snd_mixer_selem_id_set_index（SID，0）;
    snd_mixer_selem_id_set_name（SID，selem_name）;
    snd_mixer_elem_t * ELEM = snd_mixer_find_selem（手柄，SID）;    如果（snd_mixer_selem_has_playback_switch（ELEM））{
        snd_mixer_selem_set_playback_switch_all（ELEM，0）;
    }    snd_mixer_close（手柄）;
}
 

引用：和官方API 这里。

• How do I mute sound using C? Is there an ALSA function call?

• Are there any other function calls/APIs that can MUTE the microphone?

• I have written some code to do audio playback using ALSA, and I have noticed a DELAY before the sound starts playing ... how do I reduce DELAY or LATENCY on sound playback?

x

解决方案

#include <alsa/asoundlib.h>

void SetAlsaMasterMute()
{
    long min, max;
    snd_mixer_t *handle;
    snd_mixer_selem_id_t *sid;
    const char *card = "default";
    const char *selem_name = "Master";

    snd_mixer_open(&handle, 0);
    snd_mixer_attach(handle, card);
    snd_mixer_selem_register(handle, NULL, NULL);
    snd_mixer_load(handle);

    snd_mixer_selem_id_alloca(&sid);
    snd_mixer_selem_id_set_index(sid, 0);
    snd_mixer_selem_id_set_name(sid, selem_name);
    snd_mixer_elem_t* elem = snd_mixer_find_selem(handle, sid);

    if (snd_mixer_selem_has_playback_switch(elem)) {
        snd_mixer_selem_set_playback_switch_all(elem, 0);
    }

    snd_mixer_close(handle);
}

references: here and official api here.

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