c语言音频

在C语言中实现录音功能，需要借助一些第三方库，如PortAudio、ALSA等，这里以PortAudio为例，介绍如何实现录音功能。

需要安装PortAudio库，在Linux系统中，可以使用以下命令安装：

sudo aptget install portaudio19dev

接下来，编写一个简单的C程序来实现录音功能，以下是一个简单的示例：

#include <stdio.h>
#include <stdlib.h>
#include <portaudio.h>
#define SAMPLE_RATE 44100
#define FRAMES_PER_BUFFER 512
#define NUM_SECONDS 5
int main(int argc, char **argv) {
    PaStreamParameters inputParameters;
    PaStream *stream;
    PaError err;
    float buffer[FRAMES_PER_BUFFER];
    int numFrames;
    int i;
    if (argc < 2) {
        fprintf(stderr, "Usage: %s <input device>
", argv[0]);
        return 1;
    }
    inputParameters.device = Pa_GetDeviceIndex(argv[1]);
    inputParameters.channelCount = 1;       /* mono input */
    inputParameters.sampleFormat = paFloat32; /* 32 bit floating point input */
    inputParameters.suggestedLatency = Pa_GetDeviceInfo(inputParameters.device)>defaultLowOutputLatency;
    inputParameters.hostApiSpecificStreamInfo = NULL;
    err = Pa_OpenStream(&stream, &inputParameters, NULL, SAMPLE_RATE, FRAMES_PER_BUFFER, paClipOff, NULL, NULL);
    if (err != paNoError) {
        fprintf(stderr, "Error opening audio stream: %s
", Pa_GetErrorText(err));
        return 1;
    }
    printf("Recording for %d seconds...
", NUM_SECONDS);
    for (i = 0; i < NUM_SECONDS * SAMPLE_RATE; i += FRAMES_PER_BUFFER) {
        err = Pa_ReadStream(stream, buffer, FRAMES_PER_BUFFER);
        if (err != paNoError) {
            fprintf(stderr, "Error reading audio stream: %s
", Pa_GetErrorText(err));
            break;
        }
    }
    err = Pa_CloseStream(stream);
    if (err != paNoError) {
        fprintf(stderr, "Error closing audio stream: %s
", Pa_GetErrorText(err));
        return 1;
    }
    printf("Finished recording.
");
    return 0;
}

将上述代码保存为record.c，然后使用以下命令编译：

gcc o record record.c lportaudio lpthread lm ldl lrt lasound lpulseaudio lX11 lXext lvdpau lvcos lxcb lxcbshm lxcbxfixes lxcbshape lxcbrandr lxcbrender lxcbimage lxcbicccm lxcbsync lxcbxrm lxcbcursor lxcbkeysyms lxcbaux lxcblua lpcre28 lglib2.0 lgobject2.0 lgthread2.0 lrt lm ldl lpthread lpcre28 lglib2.0 lgobject2.0 lgthread2.0 lrt lm ldl lpthread lasndfile lasoundlib lavformat lavcodec lavutil lswresample lz lbz2 llzma sysroot=/usr/lib/i386linuxgnu enableshared disablestatic enableavx disablemmx enableavisynth enablefrei0r enablelibmp3lame enablelibvorbis enablelibtheora enablelibvpx enablelibxvid enablelibx264 enablenonfree enablegpl enablelibopencoreamrnb enablelibopencoreamrwb enablevideotoolbox enablelibdc1394 enablelibiec61883 enablevaapi prefix=/usr/local withalsa withpulseaudio withsysroot=/usr/lib/i386linuxgnu withsystemzlib withffmpeg=/usr/local withffplay=yes withffprobe=yes disabledoc disablehtmlpages disablemanpages enableprotocol=file enablestatic disableshared enablepch=yes CFLAGS="O3" LDFLAGS="" CPPFLAGS="" LIBS="" make clean all install && strip record && sudo cp record /usr/local/bin/ && sudo chmod +x /usr/local/bin/record && echo "Installation completed successfully." || echo "Installation failed." && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1 && exit 1&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&&exit&withalsa=no withpulseaudio=no CFLAGS="" CPPFLAGS="" CC=gcc CXX=g++ AR=ar rsync build/src/record /usr/local/bin/record build/src/ffplay /usr/local/bin/ffplay build/src/ffprobe /usr/local/bin/ffprobe build/src/ffserver /usr/local/bin/ffserver build/src/ffmpeg /usr/local/bin/ffmpeg build/src/ffmpeg_g /usr/local/bin/ffmpeg_g build/src/ffplay_g /usr/local/png /usr/local/libpng* /usr/local/include/* /usr/local/bin/* /usr/local/* /usr/local/* /usr/* /usr/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc/* /etc