vgmstream/src/meta/his.c

113 lines
3.3 KiB
C
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#include "meta.h"
#include "../util.h"
/* Her Interactive Sound .his (Nancy Drew) */
/* A somewhat transformed RIFF WAVE */
VGMSTREAM * init_vgmstream_his(STREAMFILE *streamFile) {
VGMSTREAM * vgmstream = NULL;
char filename[PATH_LIMIT];
int channel_count;
int loop_flag = 0;
int bps = 0;
off_t start_offset;
const uint8_t header_magic_expected[0x16] = "Her Interactive Sound\x1a";
uint8_t header_magic[0x16];
/* check extension, case insensitive */
streamFile->get_name(streamFile,filename,sizeof(filename));
if (strcasecmp("his",filename_extension(filename))) goto fail;
/* check header magic */
if (0x16 != streamFile->read(streamFile, header_magic, 0, 0x16)) goto fail;
if (memcmp(header_magic_expected, header_magic, 0x16)) goto fail;
/* data chunk label */
if (0x64617461 != read_32bitBE(0x24,streamFile)) goto fail;
start_offset = 0x2c;
channel_count = read_16bitLE(0x16,streamFile);
/* 8-bit or 16-bit expected */
switch (read_16bitLE(0x22,streamFile))
{
case 8:
bps = 1;
break;
case 16:
bps = 2;
break;
default:
goto fail;
}
/* check bytes per frame */
if (read_16bitLE(0x20,streamFile) != channel_count*bps) goto fail;
/* check size */
/* file size -8 */
if ((read_32bitLE(0x1c,streamFile)+8) != get_streamfile_size(streamFile))
goto fail;
/* data chunk size, assume it occupies the rest of the file */
//if ((read_32bitLE(0x28,streamFile)+start_offset) != get_streamfile_size(streamFile))
// goto fail;
/* build the VGMSTREAM */
vgmstream = allocate_vgmstream(channel_count,loop_flag);
if (!vgmstream) goto fail;
/* fill in the vital statistics */
vgmstream->num_samples = read_32bitLE(0x28,streamFile) / channel_count / bps;
vgmstream->sample_rate = read_32bitLE(0x18,streamFile);
vgmstream->meta_type = meta_HIS;
vgmstream->layout_type = layout_none;
if (bps == 2)
{
vgmstream->coding_type = coding_PCM16LE;
if (channel_count == 2)
{
vgmstream->coding_type = coding_PCM16LE_int;
vgmstream->interleave_block_size = 2;
}
}
else // bps == 1
{
vgmstream->coding_type = coding_PCM8_U;
if (channel_count == 2)
{
vgmstream->coding_type = coding_PCM8_U_int;
vgmstream->interleave_block_size = 1;
}
}
/* open the file for reading */
{
STREAMFILE * file;
file = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
if (!file) goto fail;
vgmstream->ch[0].streamfile = file;
vgmstream->ch[0].channel_start_offset=
vgmstream->ch[0].offset=start_offset;
if (channel_count == 2)
{
file = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
if (!file) goto fail;
vgmstream->ch[1].streamfile = file;
vgmstream->ch[0].channel_start_offset=
vgmstream->ch[1].offset=start_offset + vgmstream->interleave_block_size;
}
}
return vgmstream;
/* clean up anything we may have opened */
fail:
if (vgmstream) close_vgmstream(vgmstream);
return NULL;
}