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/*
* playwave.c
*
* Play sound files in wave format. Only MicroSoft PCM is supported.
*
* Michel R. Prevenier.
*/
#include <sys/types.h>
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <minix/sound.h>
int main(int argc, char **argv);
void usage(void);
/******* Wave format definitions *********/
#define RIFF_ID 0x46464952
#define WAVE_ID1 0x45564157
#define WAVE_ID2 0x20746D66
#define DATA_ID 0x61746164
#define MS_PCM_FORMAT 0x0001
#define WORD short
#define DWORD unsigned long
struct RIFF_fields
{
DWORD RIFF_id;
DWORD RIFF_len;
DWORD WAVE_id1;
DWORD WAVE_id2;
DWORD data_ptr;
} r_fields;
struct common_fields
{
WORD FormatTag;
WORD Channels;
DWORD SamplesPerSec;
DWORD AvgBytesPerSec;
WORD BlockAlign;
} c_fields;
struct specific_fields
{
WORD BitsPerSample;
} s_fields;
DWORD data_id;
DWORD data_len;
/******** End of wave definitions *********/
void usage()
{
fprintf(stderr, "Usage: playwav [-i] file\n");
exit(-1);
}
int open_audio(unsigned int *fragment_size, unsigned int channels,
unsigned int samples_per_sec, unsigned int bits)
{
unsigned int sign;
int audio;
/* Open DSP */
if ((audio = open("/dev/audio", O_RDWR)) < 0)
{
printf("Cannot open /dev/audio: %s\n", strerror(errno));
exit(-1);
}
ioctl(audio, DSPIOMAX, fragment_size); /* Get maximum fragment size. */
/* Set DSP parameters (should check return values..) */
ioctl(audio, DSPIOSIZE, fragment_size); /* Use max. fragment size. */
ioctl(audio, DSPIOSTEREO, &channels);
ioctl(audio, DSPIORATE, &samples_per_sec);
ioctl(audio, DSPIOBITS, &bits);
sign = (bits == 16 ? 1 : 0);
ioctl(audio, DSPIOSIGN, &sign);
return audio;
}
int main ( int argc, char *argv[] )
{
int i, r, audio, file;
char *buffer, *file_name = NULL;
unsigned int fragment_size, fragment_size2;
long data_pos;
int showinfo = 0;
/* Check Parameters */
if (argc > 2)
{
if (strncmp(argv[1], "-i", 2) == 0)
{
showinfo = 1;
file_name = argv[2];
}
else
usage();
}
else file_name = argv[1];
/* Open wav file */
if((file = open(file_name, O_RDONLY)) < 0)
{
printf("Cannot open %s\n", file_name);
exit(-1);
}
/* Check for valid wave format */
read(file, &r_fields, 20);
if(r_fields.RIFF_id != RIFF_ID)
{
printf("%s not in RIFF format\n", file_name);
exit(1);
}
if(r_fields.WAVE_id1 != WAVE_ID1 || r_fields.WAVE_id2 != WAVE_ID2)
{
printf("%s not in WAVE format\n", file_name);
exit(1);
}
/* Store data_chunk position */
data_pos = lseek(file, 0L, 1) + r_fields.data_ptr;
/* Read the common and specific fields */
read(file, &c_fields, 14);
read(file, &s_fields, 2);
/* Check for valid wave format, we can only play MicroSoft PCM */
if(c_fields.FormatTag != MS_PCM_FORMAT)
{
printf("%s not in MicroSoft PCM format\n", file_name);
exit(1);
}
/* Open audio device and set DSP parameters */
audio = open_audio(&fragment_size, c_fields.Channels - 1,
c_fields.SamplesPerSec, s_fields.BitsPerSample);
if ((buffer = malloc(fragment_size)) == (char *)0)
{
fprintf(stderr, "Cannot allocate buffer\n");
exit(-1);
}
/* Goto data chunk */
lseek(file, data_pos, SEEK_SET);
/* Check for valid data chunk */
read(file, &data_id, sizeof(data_id));
if(data_id != DATA_ID)
{
printf("Invalid data chunk\n");
exit(1);
}
/* Get length of data */
read(file, &data_len, sizeof(data_len));
if (showinfo)
{
printf("\nBits per sample : %d \n", s_fields.BitsPerSample);
printf("Stereo : %s \n", (c_fields.Channels == 1 ? "yes" : "no"));
printf("Samples per second: %ld \n", c_fields.SamplesPerSec);
printf("Average bytes/sec : %ld \n", c_fields.AvgBytesPerSec);
printf("Block alignment : %d \n", c_fields.BlockAlign);
printf("Datalength (bytes): %ld \n\n", data_len);
}
/* Play data */
while(data_len > 0)
{
if (data_len > fragment_size)
{
/* Read next fragment */
read(file, buffer, fragment_size);
data_len-= fragment_size;
}
else
{
/* Read until end of file and fill rest of buffer with silence,
* in PCM this means: fill buffer with last played value
*/
read(file, buffer, data_len);
for (i = data_len; i< fragment_size; i++)
buffer[i] = buffer[(int)data_len-1];
data_len = 0;
}
/* Copy data to DSP */
r= write(audio, buffer, fragment_size);
if (r != fragment_size)
{
if (r < 0)
{
fprintf(stderr, "playwave: write to audio device failed: %s\n",
strerror(errno));
/* If we get EIO, the driver might have restarted. Reopen the
* audio device.
*/
if (errno == EIO) {
close(audio);
audio = open_audio(&fragment_size2,
c_fields.Channels - 1, c_fields.SamplesPerSec,
s_fields.BitsPerSample);
if (fragment_size2 != fragment_size) {
fprintf(stderr, "Fragment size has changed\n");
exit(1);
}
}
}
else
{
fprintf(stderr, "playwave: partial write %d instead of %d\n",
r, fragment_size);
}
}
}
}
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