linux c播放音频

你可以使用ALSA（Advanced Linux Sound Architecture）库来在Linux上播放多种格式的音频。以下是一个简单的C代码示例，演示了如何使用ALSA播放WAV和MP3文件：

#include <stdio.h>
#include <stdlib.h>
#include <alsa/asoundlib.h>

#define BUFFER_SIZE 4096

int main(int argc, char *argv[]) {
    if (argc < 2) {
        printf("Usage: %s <audio_file>\n", argv[0]);
        return 1;
    }

    const char *audioFile = argv[1];

    int err;
    snd_pcm_t *handle;
    snd_pcm_hw_params_t *params;
    unsigned int sampleRate = 44100;
    int channels = 2;
    snd_pcm_uframes_t frames;
    char buffer[BUFFER_SIZE];

    // 打开PCM设备
    if ((err = snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
        printf("Error opening PCM device: %s\n", snd_strerror(err));
        return 1;
    }

    // 配置PCM参数
    snd_pcm_hw_params_alloca(&params);
    snd_pcm_hw_params_any(handle, params);
    snd_pcm_hw_params_set_access(handle, params, SND_PCM_ACCESS_RW_INTERLEAVED);
    snd_pcm_hw_params_set_format(handle, params, SND_PCM_FORMAT_S16_LE);
    snd_pcm_hw_params_set_channels(handle, params, channels);
    snd_pcm_hw_params_set_rate_near(handle, params, &sampleRate, 0);

    // 应用PCM参数
    if ((err = snd_pcm_hw_params(handle, params)) < 0) {
        printf("Error setting PCM parameters: %s\n", snd_strerror(err));
        return 1;
    }

    // 打开音频文件
    FILE *audioFp = fopen(audioFile, "rb");
    if (!audioFp) {
        printf("Error opening audio file: %s\n", audioFile);
        return 1;
    }

    // 播放音频
    while ((frames = fread(buffer, sizeof(char), BUFFER_SIZE, audioFp)) > 0) {
        if ((err = snd_pcm_writei(handle, buffer, frames)) != frames) {
            printf("Error playing audio: %s\n", snd_strerror(err));
            break;
        }
    }

    // 关闭音频文件和PCM设备
    fclose(audioFp);
    snd_pcm_drain(handle);
    snd_pcm_close(handle);

    return 0;
}

请注意，此示例仅处理WAV和MP3格式的音频文件。如果要处理其他格式的音频，可能需要使用额外的库和工具，如libogg、libvorbis、libflac等库。