Mercurial > hg > dmlib

changeset 205:9622c139cb9f

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Separate the WAV header / chunk writing functions from mod2wav into dmwav.[ch]
author Matti Hamalainen <ccr@tnsp.org>
date Sun, 07 Oct 2012 14:16:11 +0300
parents d3a9a3804079
children 9b6c0ed66960
files dmwav.c dmwav.h
diffstat 2 files changed, 122 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dmwav.c	Sun Oct 07 14:16:11 2012 +0300
@@ -0,0 +1,62 @@
+/*
+ * DMLib
+ * -- Wav file writing
+ * Programmed and designed by Matti 'ccr' Hamalainen
+ * (C) Copyright 2012 Tecnic Software productions (TNSP)
+ */
+#include "dmwav.h"
+#include "dmfile.h"
+
+
+BOOL dmWriteWAVChunk(FILE * f, DMWaveChunk *ch)
+{
+    if (!dm_fwrite_str(f, ch->chunkID, 4)) return FALSE;
+    return dm_fwrite_le32(f, ch->chunkSize);
+}
+
+
+void dmMakeWAVChunk(DMWaveChunk *ch, const char *chunkID, const Uint32 chunkSize)
+{
+    memcpy(&(ch->chunkID), (const void *) chunkID, 4);
+    ch->chunkSize = chunkSize;
+}
+
+
+void dmWriteWAVHeader(FILE *outFile, int sampBits, int sampFreq, int sampChn, size_t sampLen)
+{
+    DMWaveFile wav;
+    
+    // PCM WAVE chunk
+    dmMakeWAVChunk(&wav.chFormat, DM_WAVE_FMT_ID, (2 + 2 + 4 + 4 + 2 + 2));
+
+    wav.wFormatTag = DM_WAVE_FORMAT_PCM;
+    wav.nChannels = sampChn;
+    wav.nSamplesPerSec = sampFreq;
+    wav.nAvgBytesPerSec = (sampBits * sampChn * sampFreq) / 8;
+    wav.nBlockAlign = (sampBits * sampChn) / 8;
+    wav.wBitsPerSample = sampBits;
+
+    // Data chunk
+    dmMakeWAVChunk(&wav.chData, DM_WAVE_DATA_ID, (sampLen * wav.nBlockAlign));
+
+    // RIFF header
+    memcpy(&wav.riffID, (const void *) DM_WAVE_RIFF_ID, 4);
+    memcpy(&wav.riffType, (const void *) DM_WAVE_WAVE_ID, 4);
+    wav.fileSize = ((4 + 4 + 4) + wav.chFormat.chunkSize + wav.chData.chunkSize);
+
+    // Write header
+    dm_fwrite_str(outFile, wav.riffID, sizeof(wav.riffID));
+    dm_fwrite_le32(outFile, wav.fileSize);
+    
+    dm_fwrite_str(outFile, wav.riffType, sizeof(wav.riffType));
+    dmWriteWAVChunk(outFile, &wav.chFormat);
+    
+    dm_fwrite_le16(outFile, wav.wFormatTag);
+    dm_fwrite_le16(outFile, wav.nChannels);
+    dm_fwrite_le32(outFile, wav.nSamplesPerSec);
+    dm_fwrite_le32(outFile, wav.nAvgBytesPerSec);
+    dm_fwrite_le16(outFile, wav.nBlockAlign);
+    dm_fwrite_le16(outFile, wav.wBitsPerSample);
+    
+    dmWriteWAVChunk(outFile, &wav.chData);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dmwav.h	Sun Oct 07 14:16:11 2012 +0300
@@ -0,0 +1,60 @@
+/*
+ * DMLib
+ * -- Wav file writing
+ * Programmed and designed by Matti 'ccr' Hamalainen
+ * (C) Copyright 2012 Tecnic Software productions (TNSP)
+ */
+#ifndef DMWAV_H
+#define DMWAV_H
+
+#include "dmlib.h"
+#include <stdio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define DM_WAVE_FORMAT_PCM     (1)
+#define DM_WAVE_RIFF_ID        "RIFF"
+#define DM_WAVE_WAVE_ID        "WAVE"
+#define DM_WAVE_FMT_ID         "fmt "
+#define DM_WAVE_DATA_ID        "data"
+
+
+typedef struct
+{
+    Uint8     chunkID[4];
+    Uint32    chunkSize;
+} DMWaveChunk; 
+
+
+typedef struct
+{
+    Uint8     riffID[4];
+    Uint32    fileSize;
+    Uint8     riffType[4];
+
+    DMWaveChunk chFormat;
+
+    Uint16    wFormatTag;
+    Uint16    nChannels;
+    Uint32    nSamplesPerSec;
+    Uint32    nAvgBytesPerSec;
+    Uint16    nBlockAlign;
+    Uint16    wBitsPerSample;
+
+    DMWaveChunk chData;
+    // Data follows here
+} DMWaveFile;
+
+
+BOOL dmWriteWAVChunk(FILE * f, DMWaveChunk *ch);
+void dmMakeWAVChunk(DMWaveChunk *ch, const char *chunkID, const Uint32 chunkSize);
+void dmWriteWAVHeader(FILE *outFile, int sampBits, int sampFreq, int sampChn, size_t sampLen);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // DMWAV_H