Linux下的wav音乐播放器_C语言

#include "Tools.h" #include "WAVFormat.h" #include <stdio.h> #include <fcntl.h> #include <linux/soundcard.h> struct WAV_HEADER mWaveHeader; int music_fd; void parse(const char *pWaveFile, struct WAV_HEADER *pHeader) { if((music_fd = open(pWaveFile, O_RDONLY)) == -1) error("cannot open file: %s", pWaveFile); if(read(music_fd, pHeader, 20) <= 0) error("error reading file: %s", pWaveFile); if(read(music_fd, &pHeader->nEncodeTag, pHeader->nFormatSize) <= 0) error("error reading format chunk"); if(read(music_fd, &pHeader->cDataHeader, 8) <= 0) error("error reading data chunk"); if(pHeader->cDataHeader[0] != 'd') { printf("skip factory chunk\n"); if(lseek(music_fd, pHeader->nDataBytes, SEEK_CUR) == -1) error("error skipping factor chunk"); if(read(music_fd, &pHeader->cDataHeader, 8) <= 0) error("error re-read data chunk"); } } void print(struct WAV_HEADER *p) { printChars("riff header: ", p->cRiffHeader, 4); printf("riff size: %d\n", p->nRiffSize); printChars("riff type: ", p->cRiffTypeID, 4); printChars("format header: ", p->cFormatHeader, 4); printf("format chunk size: %d\n", p->nFormatSize); printf("format encode tag: %d\n", p->nEncodeTag); printf("channels: %d\n", p->nChannels); printf("sample rate: %dHz\n", p->nSampleRate); printf("bytes per sec: %d bytes\n", p->nBytesPerSec); printf("block align: %d bytes\n", p->nBlockAlign); printf("bits per sample: %d bits\n", p->nBitsPerSample); printChars("data header: ", p->cDataHeader, 4); printf("data chunk size: %d\n\n", p->nDataBytes); } void playback(struct WAV_HEADER *pHeader) { int fd; int stereo, sampleFormat, sampleRate; char buf[1024]; int num_read = 1024, num_write = 1024, offset = 0; if((fd = open("/dev/dsp", O_WRONLY)) == -1) error("cannot open audio device"); stereo = pHeader->nChannels > 1; if(ioctl(fd, SNDCTL_DSP_STEREO, &stereo) == -1) error("sound card do not support stereo"); sampleFormat = AFMT_S16_LE; if(pHeader->nBitsPerSample == 8) sampleFormat = AFMT_U8; if(ioctl(fd, SNDCTL_DSP_SETFMT, &sampleFormat) == -1) error("error set audio format"); sampleRate = pHeader->nSampleRate; if(ioctl(fd, SNDCTL_DSP_SPEED, &sampleRate) == -1) error("error set sample rate"); printf("playback started...\n"); if(pHeader->nBitsPerSample == 24) { num_read = 3; num_write = 2; offset = 1; } while(read(music_fd, buf, num_read) > 0) if(write(fd, buf+offset, num_write) == -1) error("error writing dsp device file"); printf("Playback finished.\n"); } void play(const char *pWaveFile) { parse(pWaveFile, &mWaveHeader); print(&mWaveHeader); playback(&mWaveHeader); }