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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); }
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.