Wav file loading

1 files changed, 52 insertions, 0 deletions

diff --git a/src/wav.c b/src/wav.c
new file mode 100644
index 0000000..61765d6
--- /dev/null
+++ b/src/wav.c
@@ -0,0 +1,52 @@
+#include "wav.h"
+#include "smrt_arena.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+void seek_to_chunk(FILE *file, char *chunk_name) {
+    char cur_name[4];
+     u32  chunk_size;
+
+    fseek(file, sizeof(wav_master_chunk_t), SEEK_SET);
+    while (true) {
+        fread(cur_name, 4, 1, file);
+        fread(&chunk_size, 4, 1, file);
+
+        if (strcmp(cur_name, chunk_name) == 0) {
+            break;
+        }
+
+        fseek(file, chunk_size, SEEK_CUR);
+    }
+
+    fseek(file, -8, SEEK_CUR);
+}
+
+wav_data_t *load_wav_file(smrt_arena_t *arena, char *filename, wav_master_chunk_t *master_o, wav_fmt_chunk_t *format_o) {
+    FILE *wav_file = fopen(filename, "rb");
+
+    if (!wav_file) {
+        return NULL;
+    }
+
+    fread(master_o, sizeof(wav_master_chunk_t), 1, wav_file);
+
+    seek_to_chunk(wav_file, "fmt ");
+    fread(format_o, sizeof(wav_fmt_chunk_t), 1, wav_file);
+
+    seek_to_chunk(wav_file, "data");
+    fseek(wav_file, 4, SEEK_CUR);
+    u32 sampled_data_size;
+    fread(&sampled_data_size, 4, 1, wav_file);
+
+    wav_data_t *data = smrt_arena_push(arena, sizeof(wav_data_t) + sampled_data_size, true);
+    fread((u8*)data+WAV_DATA_BASE_POS, sampled_data_size, 1, wav_file);
+    data->sample_count = sampled_data_size / ((format_o->bits_per_sample / 8) * format_o->num_channels);
+
+    return data;
+}
+
+void write_wav_file(char *filename, wav_fmt_chunk_t *header_i, wav_data_t *data_i);
+wav_fmt_chunk_t make_wav_fmt_chunk(u32 num_channels, u32 sample_rate, u16 bits_per_sample, wav_data_t *data_i);