ref: b9a3af2eda4ea67ee6e71f402052c36c6b9a79a7
dir: /frontend/input.c/
/*
* FAAC - Freeware Advanced Audio Coder
* Copyright (C) 2002 Krzysztof Nikiel
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: input.c,v 1.7 2003/07/10 19:18:38 knik Exp $
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#ifdef WIN32
#include <fcntl.h>
#endif
#include "input.h"
#define SWAP32(x) (((x & 0xff) << 24) | ((x & 0xff00) << 8) \
| ((x & 0xff0000) >> 8) | ((x & 0xff000000) >> 24))
#define SWAP16(x) (((x & 0xff) << 8) | ((x & 0xff00) >> 8))
#ifdef WORDS_BIGENDIAN
# define UINT32(x) SWAP32(x)
# define UINT16(x) SWAP16(x)
#else
# define UINT32(x) (x)
# define UINT16(x) (x)
#endif
typedef struct
{
u_int32_t label; /* 'RIFF' */
u_int32_t length; /* Length of rest of file */
u_int32_t chunk_type; /* 'WAVE' */
}
riff_t;
typedef struct
{
u_int32_t label;
u_int32_t len;
}
riffsub_t;
#define WAVE_FORMAT_PCM 1
#define WAVE_FORMAT_EXTENSIBLE 0xfffe
typedef struct
{
u_int16_t wFormatTag;
u_int16_t nChannels;
u_int32_t nSamplesPerSec;
u_int32_t nAvgBytesPerSec;
u_int16_t nBlockAlign;
u_int16_t wBitsPerSample;
u_int16_t cbSize;
}
WAVEFORMATEX;
typedef struct
{
WAVEFORMATEX Format;
union {
u_int16_t wValidBitsPerSample; // bits of precision
u_int16_t wSamplesPerBlock; // valid if wBitsPerSample==0
u_int16_t wReserved; // If neither applies, set to zero.
} Samples;
u_int32_t dwChannelMask; // which channels are present in stream
unsigned char SubFormat[16]; // guid
} WAVEFORMATEXTENSIBLE;
static unsigned char waveformat_pcm_guid[16] =
{
WAVE_FORMAT_PCM,0,0,0,
0x00, 0x00,
0x10, 0x00,
0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71
};
static void unsuperr(const char *name)
{
fprintf(stderr, "%s: file format not supported\n", name);
}
pcmfile_t *wav_open_read(const char *name, int rawinput)
{
int i;
int skip;
FILE *wave_f;
riff_t riff;
riffsub_t riffsub;
WAVEFORMATEXTENSIBLE wave;
char *riffl = "RIFF";
char *wavel = "WAVE";
char *fmtl = "fmt ";
char *datal = "data";
int fmtsize;
pcmfile_t *sndf;
int dostdin = 0;
if (!strcmp(name, "-"))
{
#ifdef WIN32
setmode(fileno(stdin), O_BINARY);
#endif
wave_f = stdin;
dostdin = 1;
}
else if (!(wave_f = fopen(name, "rb")))
{
perror(name);
return NULL;
}
if (!rawinput) // header input
{
if (fread(&riff, 1, sizeof(riff), wave_f) != sizeof(riff))
return NULL;
if (memcmp(&(riff.label), riffl, 4))
return NULL;
if (memcmp(&(riff.chunk_type), wavel, 4))
return NULL;
if (fread(&riffsub, 1, sizeof(riffsub), wave_f) != sizeof(riffsub))
return NULL;
riffsub.len = UINT32(riffsub.len);
if (memcmp(&(riffsub.label), fmtl, 4))
return NULL;
memset(&wave, 0, sizeof(wave));
fmtsize = (riffsub.len < sizeof(wave)) ? riffsub.len : sizeof(wave);
if (fread(&wave, 1, fmtsize, wave_f) != fmtsize)
return NULL;
for (skip = riffsub.len - fmtsize; skip > 0; skip--)
fgetc(wave_f);
for (i = 0;; i++)
{
if (fread(&riffsub, 1, sizeof(riffsub), wave_f) != sizeof(riffsub))
return NULL;
riffsub.len = UINT32(riffsub.len);
if (!memcmp(&(riffsub.label), datal, 4))
break;
if (i > 10)
return NULL;
for (skip = riffsub.len; skip > 0; skip--)
fgetc(wave_f);
}
if (UINT16(wave.Format.wFormatTag) != WAVE_FORMAT_PCM)
{
if (UINT16(wave.Format.wFormatTag) == WAVE_FORMAT_EXTENSIBLE)
{
if (UINT16(wave.Format.cbSize) < 22) // struct too small
return NULL;
if (memcmp(wave.SubFormat, waveformat_pcm_guid, 16))
{
unsuperr(name);
return NULL;
}
}
else
{
unsuperr(name);
return NULL;
}
}
}
sndf = malloc(sizeof(*sndf));
memset(sndf, 0, sizeof(*sndf));
sndf->f = wave_f;
if (rawinput)
{
sndf->bigendian = 1;
if (dostdin)
sndf->samples = 0;
else
{
fseek(sndf->f, 0 , SEEK_END);
sndf->samples = ftell(sndf->f) / (sndf->samplebytes * sndf->channels);
rewind(sndf->f);
}
}
else
{
sndf->bigendian = 0;
sndf->channels = UINT16(wave.Format.nChannels);
sndf->samplebytes = UINT16(wave.Format.wBitsPerSample) / 8;
sndf->samplerate = UINT32(wave.Format.nSamplesPerSec);
sndf->samples = riffsub.len / (sndf->samplebytes * sndf->channels);
}
return sndf;
}
static void chan_remap(int32_t *buf, int channels, int blocks, int *map)
{
int i;
int32_t *tmp = alloca(channels * sizeof(int32_t));
for (i = 0; i < blocks; i++)
{
int chn;
memcpy(tmp, buf + i * channels, sizeof(int32_t) * channels);
for (chn = 0; chn < channels; chn++)
buf[i * channels + chn] = tmp[map[chn]];
}
}
size_t wav_read_int24(pcmfile_t *sndf, int32_t *buf, size_t num, int *map)
{
int size;
int i;
unsigned char *bufi;
if ((sndf->samplebytes > 4) || (sndf->samplebytes < 1))
return 0;
bufi = (char *)buf + sizeof(*buf) * num - sndf->samplebytes * (num - 1) - sizeof(*buf);
size = fread(bufi, sndf->samplebytes, num, sndf->f);
// convert to 24 bit
// fix endianness
switch (sndf->samplebytes) {
case 1:
/* this is endian clean */
for (i = 0; i < size; i++)
buf[i] = (bufi[i] - 128) * 65536;
break;
case 2:
#ifdef WORDS_BIGENDIAN
if (!sndf->bigendian)
#else
if (sndf->bigendian)
#endif
{
// swap bytes
for (i = 0; i < size; i++)
{
int16_t s = ((int16_t *)bufi)[i];
s = SWAP16(s);
buf[i] = ((uint32_t)s) << 8;
}
}
else
{
// no swap
for (i = 0; i < size; i++)
{
int s = ((int16_t *)bufi)[i];
buf[i] = s << 8;
}
}
break;
case 3:
if (!sndf->bigendian)
{
for (i = 0; i < size; i++)
{
int s = bufi[3 * i] | (bufi[3 * i + 1] << 8) | (bufi[3 * i + 2] << 16);
// fix sign
if (s & 0x800000)
s |= 0xff000000;
buf[i] = s;
}
}
else // big endian input
{
for (i = 0; i < size; i++)
{
int s = (bufi[3 * i] << 16) | (bufi[3 * i + 1] << 8) | bufi[3 * i + 2];
// fix sign
if (s & 0x800000)
s |= 0xff000000;
buf[i] = s;
}
}
break;
case 4:
#ifdef WORDS_BIGENDIAN
if (!sndf->bigendian)
#else
if (sndf->bigendian)
#endif
{
// swap bytes
for (i = 0; i < size; i++)
{
int s = buf[i];
buf[i] = SWAP32(s);
}
}
break;
}
if (map)
chan_remap(buf, sndf->channels, size / sndf->channels, map);
return size;
}
int wav_close(pcmfile_t *sndf)
{
int i = fclose(sndf->f);
free(sndf);
return i;
}