MP3/WAV 播放
1.先下载压缩包到本地,并解压
tar -xvzf libmad-0.15.1b.tar.gz -C ./
2.进入源代码文件夹并配置
tips
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/types.h>
#include <fcntl.h>
#include <sys/types.h>
#include <semaphore.h>
#include <sys/stat.h>
#include <string.h>
#include <errno.h>
#include <linux/soundcard.h> #include <termio.h>
#include <getopt.h>
#include <time.h>
#include <strings.h>
#include <signal.h>
#include "wav.h"
#include "mad.h"
#include <sys/mman.h> #define SND_OUT_BUF_SIZE 0x2000 struct buffer {
unsigned char const *start;
unsigned long length;
}; int fd_sound;
int n;
int vol_val;
int i=0;
static
enum mad_flow input(void *data,
struct mad_stream *stream)
{
struct buffer *buffer = data; if (!buffer->length)
return MAD_FLOW_STOP; mad_stream_buffer(stream, buffer->start, buffer->length); buffer->length = 0; return MAD_FLOW_CONTINUE;
} static signed int scale(mad_fixed_t sample)
{
/* round */
sample += (1L << (MAD_F_FRACBITS - 16)); /* clip */
if (sample >= MAD_F_ONE)
sample = MAD_F_ONE - 1;
else if (sample < -MAD_F_ONE)
sample = -MAD_F_ONE; /* quantize */
return sample >> (MAD_F_FRACBITS + 1 - 16);
} static
enum mad_flow output(void *data,
struct mad_header const *header,
struct mad_pcm *pcm)
{
unsigned short nchannels ,nsamples;
unsigned int nsamplerate;
unsigned char ldata,rdata;
unsigned char outputbuf[8196],*outputptr;
int write_num;
mad_fixed_t const *left_ch, *right_ch; /* pcm->samplerate contains the sampling frequency */ nchannels = pcm->channels;
nsamplerate = pcm->samplerate;
n=nsamples = pcm->length;
left_ch = pcm->samples[0];
right_ch = pcm->samples[1]; if(i==0){
int bits_set=16;
ioctl(fd_sound, SNDCTL_DSP_SYNC, &nsamplerate);
ioctl(fd_sound, SOUND_PCM_WRITE_RATE, &nsamplerate);
ioctl(fd_sound, SNDCTL_DSP_SETFMT, &bits_set);
ioctl(fd_sound, SOUND_PCM_WRITE_CHANNELS, &nchannels);
ioctl(fd_sound, SOUND_MIXER_WRITE_VOLUME, &vol_val);
}
i++;
outputptr=outputbuf;
while (nsamples--) {
signed int sample; /* output sample(s) in 16-bit signed little-endian PCM */
sample = scale(*left_ch++);
ldata = (sample >> 0);
rdata = (sample >> 8);
//printf("ssss\n");
*(outputptr++)=ldata;
*(outputptr++)=rdata;
//printf("buflen%d\n",strlen(outputbuf[i])); if (nchannels == 2)
{
sample = scale(*right_ch++);
ldata = (sample >> 0);
rdata = (sample >> 8);
*(outputptr++)=ldata;
*(outputptr++)=rdata;
}
}
n*=4;
outputptr=outputbuf;
while(n)
{
write_num=write(fd_sound,outputptr,n);
outputptr+=write_num;
n-=write_num;
//printf("n:%d\n",n);
}
outputptr=outputbuf; return MAD_FLOW_CONTINUE;
} static
enum mad_flow error(void *data,
struct mad_stream *stream,
struct mad_frame *frame)
{
struct buffer *buffer = data; fprintf(stderr, "decoding error 0x%04x (%s) at byte offset %u\n",
stream->error, mad_stream_errorstr(stream),
stream->this_frame - buffer->start); /* return MAD_FLOW_BREAK here to stop decoding (and propagate an error) */ return MAD_FLOW_CONTINUE;
} static int decode(unsigned char const *start, unsigned long length)
{
struct buffer buffer;
struct mad_decoder decoder;
int result; /* initialize our private message structure */ buffer.start = start;
buffer.length = length; /* configure input, output, and error functions */ mad_decoder_init(&decoder, &buffer,
input, 0 /* header */, 0 /* filter */, output,
error, 0 /* message */); /* start decoding */ result = mad_decoder_run(&decoder, MAD_DECODER_MODE_SYNC); /* release the decoder */ mad_decoder_finish(&decoder); return result;
} int main(int argc, char **argv)
{
if(argc < 3)
{
printf("argc error\n");
return -1;
}
int rate_set, bits_set, ch_set,fd_file_path=0,DataLen;
char file_path[256]={0};
int *psound_data_buf=NULL;
struct stat stat;
void *fdm;
//ch_set=2;
//bits_set=16;
//rate_set=44100;
if(sscanf(argv[1], "%s", &file_path)!= 1 ||sscanf(argv[2], "%d", &vol_val)!= 1)
{
printf("argv error\n");
return -1;
}
if(vol_val<0)
vol_val=26;
if(strcmp(&file_path[strlen(file_path)-4],".wav")!=0 && strcmp(&file_path[strlen(file_path)-4],".mp3")!=0)
{
printf("file is not wav or mp3 farmat\n");
return -1; }
while((fd_sound = open("/dev/dsp",O_WRONLY)) == -1) {
printf("Can not open /dev/dsp\n");
return -1;
}
fd_file_path = open(file_path,O_RDONLY);
if(fd_file_path == -1)
{
printf("fd_file_path open file error");
goto exit;
} if(strcmp(&file_path[strlen(file_path)-4],".wav")==0)
{
wav_struct FileWav;
psound_data_buf=(int *)malloc(SND_OUT_BUF_SIZE);
if(psound_data_buf == NULL)
goto exit; memset(&FileWav,0,sizeof(FileWav));
if((DataLen = read(fd_file_path, &FileWav, sizeof(FileWav)))>0)
{
if((strncmp(FileWav.rif_info.riff,RIFF_FIELD,strlen(RIFF_FIELD)) == 0)&&(strncmp(FileWav.rif_info.wave,WAVE_FIELD,strlen(WAVE_FIELD)) == 0))
{
rate_set=FileWav.fmt_info.sample_rate;
ch_set=FileWav.fmt_info.channel_nb;
bits_set=FileWav.fmt_info.bits_per_sample;
}
else
{
printf("wav head error\n");
goto exit;
}
}
else
{
goto exit;
}
//printf("sample:%d,channel:%d,bits:%d,vol_val:%d\n", rate_set,ch_set,bits_set,vol_val);
ioctl(fd_sound, SNDCTL_DSP_SYNC, &rate_set);
ioctl(fd_sound, SOUND_PCM_WRITE_RATE, &rate_set);
ioctl(fd_sound, SNDCTL_DSP_SETFMT, &bits_set);
ioctl(fd_sound, SOUND_PCM_WRITE_CHANNELS, &ch_set);
ioctl(fd_sound, SOUND_MIXER_WRITE_VOLUME, &vol_val);
while((DataLen=read(fd_file_path, psound_data_buf ,SND_OUT_BUF_SIZE))>0)
write(fd_sound, psound_data_buf, DataLen);
free(psound_data_buf);
}
/*mp3 play*/
else if(strcmp(&file_path[strlen(file_path)-4],".mp3")==0)
{
if(fstat(fd_file_path,&stat)==-1||stat.st_size==0)
goto exit;
fdm=mmap(0,stat.st_size,PROT_READ,MAP_SHARED,fd_file_path,0);
if(fdm==MAP_FAILED)
goto exit;
decode(fdm,stat.st_size); } exit:
if(munmap(fdm,stat.st_size)==-1)
{
printf("munmap error\n");
}
if(fd_file_path>0)
{
close(fd_file_path);
fd_file_path=0;
}
if(fd_sound>0)
{
close(fd_sound);
fd_sound=0;
} return 0;
}
< wav.h >
#ifndef _WAV_H_
#define _WAV_H_ /*_____ I N C L U D E S ____________________________________________________*/ /*_____ M A C R O S ________________________________________________________*/ #define WAV_HEADER_SIZE sizeof(wav_struct) /* RIFF info */
#define RIFF_FIELD "RIFF"
#define WAVE_FIELD "WAVE" /* FMT info */
#define FMT_FIELD "FMT "
#define FMT_LENGTH ((unsigned long)(16)) /* data start beg of sector */
/* wave format */
#define PCM_FMT ((unsigned short)0x0100)
/* channel number */
#define MONO ((unsigned short)0x0100)
#define STEREO ((unsigned short)0x0200)
/* bytes per sample */
#define ONE_BYTE ((unsigned short)0x0100)
#define TWO_BYTE ((unsigned short)0x0200)
/* bits per sample */
#define EIGHT_BIT ((unsigned short)0x0800)
#define SIXTEEN_BIT ((unsigned short)0x1000)
/* DATA info */
#define DATA_FIELD 'data' /*_____ D E F I N I T I O N ________________________________________________*/ /* WAV Format Structure */ typedef struct
{ /* RIFF info */
char riff[4];
unsigned long pack_length;
char wave[4];
} riff_struct; typedef struct
{ /* FMT info */
char fmt[4];
unsigned long fmt_length;
unsigned short wav_format;
unsigned short channel_nb;
unsigned long sample_rate;
unsigned long bytes_per_second;
unsigned short bytes_per_sample;
unsigned short bits_per_sample;
} fmt_struct; typedef struct
{ /* DATA info */
char dat[4];
unsigned long data_length;
} data_struct; typedef struct
{
riff_struct rif_info;
fmt_struct fmt_info;
data_struct dat_info;
} wav_struct; /*_____ D E C L A R A T I O N ______________________________________________*/ #endif /* _WAV_H_ */
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