1 files changed, 41 insertions, 0 deletions
diff --git a/wave.c b/wave.c
new file mode 100644
index 0000000..cf3d11e
--- /dev/null
+++ b/wave.c
@@ -0,0 +1,41 @@
+#include "wave.h"
+#include <stddef.h>
+#include <string.h>
+
+int wave_init(FILE * f, uint32_t sample_rate, uint16_t bits_per_sample, uint16_t num_channels)
+{
+	wave_header header;
+	memcpy(header.chunk.id, "RIFF", 4);
+	memcpy(header.chunk.format, "WAVE", 4);
+	header.chunk.size = 0; //This will be filled in later
+	memcpy(header.format_header.id, "fmt ", 4);
+	header.format_header.size = sizeof(wave_header) - (sizeof(header.chunk) + sizeof(header.data_header) + sizeof(header.format_header));
+	header.audio_format = 1;
+	header.num_channels = num_channels;
+	header.sample_rate = sample_rate;
+	header.byte_rate = sample_rate * num_channels * (bits_per_sample/8);
+	header.block_align = num_channels * (bits_per_sample/8);
+	header.bits_per_sample = bits_per_sample;
+	memcpy(header.data_header.id, "data", 4);
+	header.data_header.size = 0;//This will be filled in later;
+	return fwrite(&header, 1, sizeof(header), f) == sizeof(header);
+}
+
+int wave_finalize(FILE * f)
+{
+	uint32_t size = ftell(f);
+	fseek(f, offsetof(wave_header, chunk.size), SEEK_SET);
+	size -= 8;
+	if (fwrite(&size, sizeof(size), 1, f) != sizeof(size)) {
+		fclose(f);
+		return 0;
+	}
+	fseek(f, offsetof(wave_header, data_header.size), SEEK_SET);
+	size -= 36;
+	if (fwrite(&size, sizeof(size), 1, f)) {
+		fclose(f);
+		return 0;
+	}
+	fclose(f);
+	return 1;
+}