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#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <fusionsound.h>
#include "loader.h"
typedef struct fmtChunk {
u16 encoding;
u16 channels; /* 1 = mono, 2 = stereo */
u32 frequency; /* One of 11025, 22050, or 44100 Hz */
u32 byterate; /* Average bytes per second */
u16 blockalign; /* Bytes per sample block */
u16 bitspersample; /* One of 8, 12, 16, or 4 for ADPCM */
} fmtChunk;
#ifdef WORDS_BIGENDIAN
#define SWAP16(a) (((a)>>8) | ((a) << 8))
#define SWAP32(a) (((a) >> 24) | (((a) & 0x00ff0000) >> 8) | (((a) & 0x0000ff00) << 8) | (((a) << 24)))
static void fixup_fmtchunk(struct fmtChunk *fmtchunk)
{
fmtchunk->encoding = SWAP16(fmtchunk->encoding);
fmtchunk->channels = SWAP16(fmtchunk->channels);
fmtchunk->frequency = SWAP32(fmtchunk->frequency);
fmtchunk->byterate = SWAP32(fmtchunk->byterate);
fmtchunk->blockalign = SWAP16(fmtchunk->blockalign);
fmtchunk->bitspersample = SWAP16(fmtchunk->bitspersample);
}
static void fixup_sampledata(u16 *data, int len)
{
len/=2;
while (len--) {
u16 tmp = *data;
*data++ = SWAP16(tmp);
}
}
#endif
static DirectResult
read_file_header (int fd)
{
char buf[12];
if (read (fd, buf, 12) < 12) {
fprintf (stderr, "Could not read at least 12 bytes!\n");
return DR_IO;
}
if (buf[0] != 'R' || buf[1] != 'I' || buf[2] != 'F' || buf[3] != 'F') {
fprintf (stderr, "No RIFF header found!\n");
return DR_UNSUPPORTED;
}
if (buf[8] != 'W' || buf[9] != 'A' || buf[10] != 'V' || buf[11] != 'E') {
fprintf (stderr, "Not a WAVE!\n");
return DR_UNSUPPORTED;
}
return DR_OK;
}
static int
read_chunk_header (int fd, char *magic)
{
unsigned char buf[8];
if (read (fd, buf, 8) < 8) {
fprintf (stderr, "Could not read 8 bytes of chunk header!\n");
return -1;
}
strncpy (magic, (char*)buf, 4);
return buf[4] | (buf[5] << 8) | (buf[6] << 16) | (buf[7] << 24);
}
IFusionSoundBuffer *
load_sample (IFusionSound *sound, const char *filename)
{
DirectResult ret;
int fd;
FSBufferDescription desc;
IFusionSoundBuffer *buffer;
void *data;
fmtChunk fmt;
int len;
fd = open (filename, O_RDONLY);
if (fd < 0) {
perror (filename);
return NULL;
}
if (read_file_header (fd)) {
close (fd);
return NULL;
}
while (1) {
char magic[4];
len = read_chunk_header (fd, magic);
if (len <= 0) {
fprintf (stderr, "Could not find format chunk!\n");
close (fd);
return NULL;
}
if (magic[0] == 'f' || magic[1] == 'm' || magic[2] == 't') {
if (len < sizeof(fmtChunk)) {
fprintf (stderr, "Format chunk has invalid size (%d/%zu)!\n",
len, sizeof(fmtChunk));
close (fd);
return NULL;
}
if (read (fd, &fmt, sizeof(fmtChunk)) < sizeof(fmtChunk)) {
fprintf (stderr, "Could not read format chunk!\n");
close (fd);
return NULL;
}
if (lseek (fd, len - sizeof(fmtChunk), SEEK_CUR) == (off_t) -1) {
fprintf (stderr, "Could not seek past chunk!\n");
close (fd);
return NULL;
}
break;
}
else {
if (lseek (fd, len, SEEK_CUR) == (off_t) -1) {
fprintf (stderr, "Could not seek past chunk!\n");
close (fd);
return NULL;
}
}
}
#ifdef WORDS_BIGENDIAN
fixup_fmtchunk( &fmt );
#endif
if (fmt.encoding != 1) {
fprintf (stderr, "Only PCM supported, yet!\n");
close (fd);
return NULL;
}
if (fmt.bitspersample != 16 && fmt.bitspersample != 8) {
fprintf (stderr, "Only 16 or 8 bit supported, yet!\n");
close (fd);
return NULL;
}
desc.flags = FSBDF_LENGTH | FSBDF_CHANNELS |
FSBDF_SAMPLEFORMAT | FSBDF_SAMPLERATE;
desc.channels = fmt.channels;
desc.sampleformat = (fmt.bitspersample == 8) ? FSSF_U8 : FSSF_S16;
desc.samplerate = fmt.frequency;
while (1) {
char magic[4];
len = read_chunk_header (fd, magic);
if (len <= 0) {
fprintf (stderr, "Could not find data chunk!\n");
close (fd);
return NULL;
}
if (magic[0] == 'd' && magic[1] == 'a' &&
magic[2] == 't' && magic[3] == 'a')
{
desc.length = len / fmt.blockalign;
break;
}
else {
if (lseek (fd, len, SEEK_CUR) == (off_t) -1) {
fprintf (stderr, "Could not seek past chunk!\n");
close (fd);
return NULL;
}
}
}
ret = sound->CreateBuffer (sound, &desc, &buffer);
if (ret) {
FusionSoundError ("IFusionSound::CreateBuffer", ret);
close (fd);
return NULL;
}
buffer->Lock (buffer, &data, 0, 0);
if (read (fd, data, len) < len)
fprintf (stderr, "Warning: Could not read all data bytes!\n");
#ifdef WORDS_BIGENDIAN
if (fmt.bitspersample == 16)
fixup_sampledata (data, len);
#endif
close (fd);
buffer->Unlock (buffer);
return buffer;
}
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