add code for audio types, support record in wave format

Take out code with audio types to audio_types.c

3 files changed, 90 insertions, 0 deletions

diff --git a/parecord/audio_types.c b/parecord/audio_types.c
new file mode 100644
index 0000000..59652e0
--- /dev/null
+++ b/parecord/audio_types.c
@@ -0,0 +1,46 @@
+#include <string.h>
+
+#include "audio_types.h"
+
+static const struct audio_format support_formats[] = {
+	{"wav", 44}, // AUDIO_FORMAT_WAVE = 0
+	{NULL, 0}
+};
+
+struct wav_header *init_wav_header(struct wav_header *header,
+	uint32_t size, uint32_t subchunk1Size, uint16_t audioFormat,
+	uint16_t numChannels, uint32_t sampleRate, uint32_t bitsPerSample)
+{
+	header->chunkId = 0x46464952; // = "RIFF"
+	header->chunkSize = size - 8;
+	header->format = 0x45564157; // = "WAVE"
+	header->subchunk1Id = 0x20746d66; // = "fmt "
+	header->subchunk1Size = subchunk1Size;
+	header->audioFormat = audioFormat;
+	header->numChannels = numChannels;
+	header->sampleRate = sampleRate;
+	header->byteRate = sampleRate * numChannels * (bitsPerSample/8);
+	header->blockAlign = numChannels * (bitsPerSample/8);
+	header->bitsPerSample = bitsPerSample;
+	header->subchunk2Id = 0x61746164; // = "data"
+	header->subchunk2Size = size - 44;
+
+	return header;
+}
+
+int checkAudioFormat(char *source)
+{
+	int i;
+	for(i = 0; support_formats[i].name != NULL; i++) {
+		if(strcmp(source, support_formats[i].name) == 0) {
+			return i;
+		}
+	}
+
+	return AUDIO_FORMAT_NONE;
+}
+
+off_t getOffset(int format)
+{
+	return support_formats[format].rsv_bytes;
+}
\ No newline at end of file
diff --git a/parecord/audio_types.h b/parecord/audio_types.h
new file mode 100644
index 0000000..90a5fc6
--- /dev/null
+++ b/parecord/audio_types.h
@@ -0,0 +1,23 @@
+#ifndef PAR_AUDIOTYPES_H
+#define PAR_AUDIOTYPES_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include "wav_header.h"
+
+#define AUDIO_FORMAT_NONE -1
+#define AUDIO_FORMAT_WAVE 0
+
+struct audio_format {
+	const char *name;
+	off_t rsv_bytes;
+};
+
+struct wav_header *init_wav_header(struct wav_header *header,
+	uint32_t size, uint32_t subchunk1Size, uint16_t audioFormat,
+	uint16_t numChannels, uint32_t sampleRate, uint32_t bitsPerSample);
+int checkAudioFormat(char *source);
+off_t getOffset(int format);
+
+#endif /* AT_AUDIOTYPES_H */
diff --git a/parecord/wav_header.h b/parecord/wav_header.h
new file mode 100644
index 0000000..eaf862b
--- /dev/null
+++ b/parecord/wav_header.h
@@ -0,0 +1,21 @@
+#ifndef WAV_HEADER_H
+#define WAV_HEADER_H
+
+struct wav_header
+{
+    uint32_t chunkId;
+    uint32_t chunkSize;
+    uint32_t format;
+    uint32_t subchunk1Id;
+    uint32_t subchunk1Size;
+    uint16_t audioFormat;
+    uint16_t numChannels;
+    uint32_t sampleRate;
+    uint32_t byteRate;
+    uint16_t blockAlign;
+    uint16_t bitsPerSample;
+    uint32_t subchunk2Id;
+    uint32_t subchunk2Size;
+};
+
+#endif /* WAV_HEADER_H */