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record.c
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1991-08-13
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/*
* recordchaintest.c - this test shows how to chain small recordings
* and append them to a soundfile.
*/
#import <stdio.h>
#import <sound/sound.h>
#define NUM_BUFFERS 2
#define BUF_SIZE 8192
#define SECONDS 10000.0
static SNDSoundStruct *buffers[NUM_BUFFERS];
static FILE *sfp;
static int requestedDataSize, recordedDataSize = 0;
static int lastBufNum;
static void record(int tag);
static int recordDone(SNDSoundStruct *s, int tag, int err)
/*
* Called when a buffer has been recorded.
* Appends the buffer to the soundfile and initiates recording into it again.
*/
{
if (recordedDataSize >= requestedDataSize)
return 0;
if (err)
fprintf(stderr, "recordDone: %s\n", SNDSoundError(err));
if (fwrite((void*)((char*)s + s->dataLocation), 1, s->dataSize, stdout) !=
s->dataSize)
fprintf(stderr, "recordDone: could not write data to soundfile\n");
recordedDataSize += s->dataSize;
record((lastBufNum + 1) % NUM_BUFFERS);
return 0;
}
static void record(int bufNum)
/*
* Initiates recording into a buffers[bufNum].
*/
{
int err;
static int tag = 1;
lastBufNum = bufNum;
if (err = SNDStartRecording(buffers[bufNum], tag++, 0, 0, SND_NULL_FUN,
recordDone))
fprintf(stderr, "record: %s\n", SNDSoundError(err));
}
static void init(int n, int size)
/*
* Allocate n sound buffers.
* Creates the soundfile.
*/
{
int i, err;
SNDSoundStruct s;
for (i = 0; i < n; i++)
if (err = SNDAlloc(&buffers[i], size, SND_FORMAT_MULAW_8,
SND_RATE_CODEC, 1, 4))
fprintf(stderr, "init: %s\n", SNDSoundError(err));
if (fwrite((void *)&s, sizeof(SNDSoundStruct), 1, stdout) != 1)
fprintf(stderr, "init: could not write dummy header to soundfile\n");
}
static void cleanup(void)
/*
* Write the soundfile header.
*/
{
SNDSoundStruct s;
s.magic = SND_MAGIC;
s.dataLocation = sizeof(SNDSoundStruct);
s.dataSize = recordedDataSize;
s.dataFormat = SND_FORMAT_MULAW_8;
s.samplingRate = SND_RATE_CODEC;
s.channelCount = 1;
if (fwrite((void *)&s, sizeof(SNDSoundStruct), 1, stdout) != 1)
fprintf(stderr, "cleanup: could not write header to soundfile\n");
}
main(int argc, char *argv[])
{
int i;
requestedDataSize = SECONDS * SND_RATE_CODEC;
cleanup();
init(NUM_BUFFERS, BUF_SIZE);
for (i=0; i<NUM_BUFFERS; i++)
record(i);
SNDWait(0);
}