Basic output working

2017-01-22 19:55:59 +01:00
parent d14cf3ac74
commit b954b0ff2d
17 changed files with 274 additions and 5579 deletions
--- a/src/wavefile.c
+++ b/src/wavefile.c
@@ -0,0 +1,90 @@
+#include <string.h>
+#include "filesystem.h"
+#include "wavefile.h"
+#include "source.h"
+#include "lib/dmt/dmt.h"
+
+typedef struct {
+  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;
+} waveheader_t;
+
+#define RIFF_CHUNK_ID     0x46464952
+#define WAVE_FORMAT       0x45564157
+#define FORMAT_CHUNK_ID   0x20746d66
+#define DATA_CHUNK_ID     0x61746164
+#define FORMAT_CHUNK_SIZE 16
+#define AUDIO_FORMAT_PCM  1
+
+
+char const* wavefile_load(source_t *source, char const *filename) {
+  int fileSize;
+  char const *err = 0;
+  uint8_t *waveData = filesystem_read(filename, &fileSize);
+
+  waveheader_t const* header = (waveheader_t const*)waveData;
+
+  if(header->chunkId != RIFF_CHUNK_ID
+      || header->format != WAVE_FORMAT
+      || header->subchunk1Id != FORMAT_CHUNK_ID
+      || header->subchunk2Id != DATA_CHUNK_ID) {
+    err = "Invalid WAV header";
+    goto fail;
+  }
+
+  if(header->subchunk1Size != FORMAT_CHUNK_SIZE
+      || header->audioFormat != AUDIO_FORMAT_PCM) {
+    err = "Invalid Audio Format (only PCM supported)";
+    goto fail;
+  }
+  
+  if(header->numChannels != 1) {
+    err = "Invalid Audio Format (only 1 channel supported)";
+    goto fail;
+  }
+
+  if(header->sampleRate != 22050) {
+    err = "Invalid Audio Format (only 22050Hz supported)";
+    goto fail;
+  }
+
+  if(header->bitsPerSample != 16) {
+    err = "Invalid Audio Format (only 16 Bit supported)";
+    goto fail;
+  }
+
+  if(header->byteRate != header->sampleRate * header->numChannels * header->bitsPerSample / 8) {
+    err = "Byte rate doesn't match header info";
+    goto fail;
+  }
+
+  if(header->blockAlign != header->numChannels * header->bitsPerSample / 8) {
+    err = "Block alignment doesn't match header info";
+    goto fail;
+  }
+
+  if(fileSize < sizeof(waveheader_t) + header->subchunk2Size) {
+    err = "Short read while reading samples";
+    goto fail;
+  }
+
+  source->sampleCount = header->subchunk2Size / 2;
+  source->samples = (int16_t*)dmt_malloc(header->subchunk2Size);
+
+  memcpy(source->samples, ((uint8_t*)waveData) + sizeof(waveheader_t), header->subchunk2Size);
+
+fail:
+  filesystem_free(waveData);
+  return err;
+}