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前言

平常读麦克风的场景居多，有时候也需要播放一个声音文件，这里就介绍怎么处理。

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一、命令行

1.ffmpeg

ffmpeg -i <filename.wav> -f alsa default

2.aplay

aplay -i <filename.wav>

如果提示找不到aplay就安装工具：

sudo apt install alsa-utils

二、代码实现

main.cpp

#include <alsa/asoundlib.h>
#include <iostream>
#include <fstream>#define PCM_DEVICE "default"//默认的播放设备,你可以在settings里面调换int main(int argc, char *argv[]) {const char *audioFilename = "../wakeup.wav";// 配置ALSA参数snd_pcm_t *pcmHandle;if (snd_pcm_open(&pcmHandle, PCM_DEVICE, SND_PCM_STREAM_PLAYBACK, 0) < 0) {std::cerr << "Error: Failed to open PCM device" << std::endl;return 1;}snd_pcm_hw_params_t *params;snd_pcm_hw_params_alloca(&params);snd_pcm_hw_params_any(pcmHandle, params);snd_pcm_hw_params_set_access(pcmHandle, params, SND_PCM_ACCESS_RW_INTERLEAVED);snd_pcm_hw_params_set_format(pcmHandle, params, SND_PCM_FORMAT_S16_LE);snd_pcm_hw_params_set_channels(pcmHandle, params, 2);unsigned int sampleRate = 48000;snd_pcm_hw_params_set_rate_near(pcmHandle, params, &sampleRate, nullptr);snd_pcm_uframes_t bufferSize = 512;snd_pcm_hw_params_set_buffer_size_near(pcmHandle, params, &bufferSize);snd_pcm_hw_params(pcmHandle, params);std::ifstream ifs("../wakeup.wav");if (ifs.is_open()) {std::string data;size_t size;char buffer[8192];while ((size = ifs.readsome(buffer, 8192)) > 0) {data.append(buffer, size);}snd_pcm_sframes_t err = snd_pcm_writei(pcmHandle, (const void *) data.c_str(),data.size()); if (err < 0) {std::cerr << "Error: Failed to write PCM device" << std::endl;}ifs.close();}// 关闭PCM设备和文件snd_pcm_close(pcmHandle);return 0;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.10)
project(write_speaker)set(CMAKE_CXX_STANDARD 11)add_executable(${PROJECT_NAME} main.cpp)
target_link_libraries(${PROJECT_NAME} asound)

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总结

1、不算太难