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////////////////////////////////////////////////////////////////////////////
// **** WAVPACK **** //
// Hybrid Lossless Wavefile Compressor //
// Copyright (c) 1998 - 2006 Conifer Software. //
// All Rights Reserved. //
// Distributed under the BSD Software License (see license.txt) //
////////////////////////////////////////////////////////////////////////////
// wv_filter.c
// This is the main module for the demonstration WavPack command-line
// decoder filter. It uses the tiny "hardware" version of the decoder and
// accepts WavPack files on stdin and outputs a standard MS wav file to
// stdout. Note that this involves converting the data to little-endian
// (if the executing processor is not), possibly packing the data into
// fewer bytes per sample, and generating an appropriate riff wav header.
// Note that this is NOT the copy of the RIFF header that might be stored
// in the file, and any additional RIFF information and tags are lost.
// See wputils.c for further limitations.
#include "wavpack.h"
#if defined(WIN32)
#include <io.h>
#include <fcntl.h>
#endif
#include <string.h>
// These structures are used to place a wav riff header at the beginning of
// the output.
typedef struct {
char ckID [4];
uint32_t ckSize;
char formType [4];
} RiffChunkHeader;
typedef struct {
char ckID [4];
uint32_t ckSize;
} ChunkHeader;
#define ChunkHeaderFormat "4L"
typedef struct {
ushort FormatTag, NumChannels;
uint32_t SampleRate, BytesPerSecond;
ushort BlockAlign, BitsPerSample;
} WaveHeader;
#define WaveHeaderFormat "SSLLSS"
static uchar *format_samples (int bps, uchar *dst, int32_t *src, uint32_t samcnt);
static int32_t read_bytes (void *buff, int32_t bcount);
static int32_t temp_buffer [256];
int main ()
{
ChunkHeader FormatChunkHeader, DataChunkHeader;
RiffChunkHeader RiffChunkHeader;
WaveHeader WaveHeader;
uint32_t total_unpacked_samples = 0, total_samples;
int num_channels, bps;
WavpackContext *wpc;
char error [80];
#if defined(WIN32)
setmode (fileno (stdin), O_BINARY);
setmode (fileno (stdout), O_BINARY);
#endif
wpc = WavpackOpenFileInput (read_bytes, error);
if (!wpc) {
fputs (error, stderr);
fputs ("\n", stderr);
return 1;
}
num_channels = WavpackGetReducedChannels (wpc);
total_samples = WavpackGetNumSamples (wpc);
bps = WavpackGetBytesPerSample (wpc);
strncpy (RiffChunkHeader.ckID, "RIFF", sizeof (RiffChunkHeader.ckID));
RiffChunkHeader.ckSize = total_samples * num_channels * bps + sizeof (ChunkHeader) * 2 + sizeof (WaveHeader) + 4;
strncpy (RiffChunkHeader.formType, "WAVE", sizeof (RiffChunkHeader.formType));
strncpy (FormatChunkHeader.ckID, "fmt ", sizeof (FormatChunkHeader.ckID));
FormatChunkHeader.ckSize = sizeof (WaveHeader);
WaveHeader.FormatTag = 1;
WaveHeader.NumChannels = num_channels;
WaveHeader.SampleRate = WavpackGetSampleRate (wpc);
WaveHeader.BlockAlign = num_channels * bps;
WaveHeader.BytesPerSecond = WaveHeader.SampleRate * WaveHeader.BlockAlign;
WaveHeader.BitsPerSample = WavpackGetBitsPerSample (wpc);
strncpy (DataChunkHeader.ckID, "data", sizeof (DataChunkHeader.ckID));
DataChunkHeader.ckSize = total_samples * num_channels * bps;
native_to_little_endian (&RiffChunkHeader, ChunkHeaderFormat);
native_to_little_endian (&FormatChunkHeader, ChunkHeaderFormat);
native_to_little_endian (&WaveHeader, WaveHeaderFormat);
native_to_little_endian (&DataChunkHeader, ChunkHeaderFormat);
if (!fwrite (&RiffChunkHeader, sizeof (RiffChunkHeader), 1, stdout) ||
!fwrite (&FormatChunkHeader, sizeof (FormatChunkHeader), 1, stdout) ||
!fwrite (&WaveHeader, sizeof (WaveHeader), 1, stdout) ||
!fwrite (&DataChunkHeader, sizeof (DataChunkHeader), 1, stdout)) {
fputs ("can't write .WAV data, disk probably full!\n", stderr);
return 1;
}
while (1) {
uint32_t samples_unpacked;
samples_unpacked = WavpackUnpackSamples (wpc, temp_buffer, 256 / num_channels);
total_unpacked_samples += samples_unpacked;
if (samples_unpacked) {
format_samples (bps, (uchar *) temp_buffer, temp_buffer, samples_unpacked *= num_channels);
if (fwrite (temp_buffer, bps, samples_unpacked, stdout) != samples_unpacked) {
fputs ("can't write .WAV data, disk probably full!\n", stderr);
return 1;
}
}
if (!samples_unpacked)
break;
}
fflush (stdout);
if (WavpackGetNumSamples (wpc) != (uint32_t) -1 &&
total_unpacked_samples != WavpackGetNumSamples (wpc)) {
fputs ("incorrect number of samples!\n", stderr);
return 1;
}
if (WavpackGetNumErrors (wpc)) {
fputs ("crc errors detected!\n", stderr);
return 1;
}
return 0;
}
static int32_t read_bytes (void *buff, int32_t bcount)
{
return fread (buff, 1, bcount, stdin);
}
// Reformat samples from longs in processor's native endian mode to
// little-endian data with (possibly) less than 4 bytes / sample.
static uchar *format_samples (int bps, uchar *dst, int32_t *src, uint32_t samcnt)
{
int32_t temp;
switch (bps) {
case 1:
while (samcnt--)
*dst++ = *src++ + 128;
break;
case 2:
while (samcnt--) {
*dst++ = (uchar)(temp = *src++);
*dst++ = (uchar)(temp >> 8);
}
break;
case 3:
while (samcnt--) {
*dst++ = (uchar)(temp = *src++);
*dst++ = (uchar)(temp >> 8);
*dst++ = (uchar)(temp >> 16);
}
break;
case 4:
while (samcnt--) {
*dst++ = (uchar)(temp = *src++);
*dst++ = (uchar)(temp >> 8);
*dst++ = (uchar)(temp >> 16);
*dst++ = (uchar)(temp >> 24);
}
break;
}
return dst;
}
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