VGMSTREAM * init_vgmstream_str_snds(STREAMFILE *streamFile) {
VGMSTREAM * vgmstream = NULL;
char filename[1024];
int channel_count;
int loop_flag = 0;
off_t SHDR_offset = -1;
int FoundSHDR = 0;
int CTRL_size = -1;
size_t file_size;
/* check extension, case insensitive */
streamFile->get_name(streamFile,filename,sizeof(filename));
if (strcasecmp("str",filename_extension(filename))) goto fail;
/* check for opening CTRL or SNDS chunk */
if (read_32bitBE(0x0,streamFile) != 0x4354524c && /* CTRL */
read_32bitBE(0x0,streamFile) != 0x534e4453 && // SNDS
read_32bitBE(0x0,streamFile) != 0x53484452) // SHDR
goto fail;
file_size = get_streamfile_size(streamFile);
/* scan chunks until we find a SNDS containing a SHDR */
{
off_t current_chunk;
current_chunk = 0;
while (!FoundSHDR && current_chunk < file_size) {
if (current_chunk < 0) goto fail;
if (current_chunk+read_32bitBE(current_chunk+4,streamFile) >=
file_size) goto fail;
switch (read_32bitBE(current_chunk,streamFile))
{
case 0x4354524C: /* CTRL */
/* to distinguish between styles */
CTRL_size = read_32bitBE(current_chunk+4,streamFile);
break;
case 0x534e4453: /* SNDS */
switch (read_32bitBE(current_chunk+16,streamFile))
{
case 0x53484452: /* SHDR */
FoundSHDR = 1;
SHDR_offset = current_chunk+16;
break;
default:
break;
}
break;
case 0x53484452: /* SHDR */
switch (read_32bitBE(current_chunk+0x7C, streamFile))
{
case 0x4354524C: /* CTRL */
// to distinguish between styles
CTRL_size = read_32bitBE(current_chunk + 0x80, streamFile);
break;
default:
break;
}
break;
default:
/* ignore others for now */
break;
}
current_chunk += read_32bitBE(current_chunk+4,streamFile);
}
}
if (!FoundSHDR) goto fail;
/* details */
channel_count = read_32bitBE(SHDR_offset+0x20,streamFile);
loop_flag = 0;
/* build the VGMSTREAM */
vgmstream = allocate_vgmstream(channel_count,loop_flag);
if (!vgmstream) goto fail;
/* fill in the vital statistics */
if ((CTRL_size == 0x1C) ||
(CTRL_size == 0x0B) ||
(CTRL_size == -1))
{
vgmstream->num_samples =
read_32bitBE(SHDR_offset+0x2c,streamFile)-1; /* sample count? */
}
else {
vgmstream->num_samples =
read_32bitBE(SHDR_offset+0x2c,streamFile) /* frame count? */
* 0x10;
}
vgmstream->num_samples/=vgmstream->channels;
vgmstream->sample_rate = read_32bitBE(SHDR_offset+0x1c,streamFile);
switch (read_32bitBE(SHDR_offset+0x24,streamFile)) {
case 0x53445832: /* SDX2 */
if (channel_count > 1) {
vgmstream->coding_type = coding_SDX2_int;
vgmstream->interleave_block_size = 1;
} else
vgmstream->coding_type = coding_SDX2;
break;
default:
goto fail;
}
vgmstream->layout_type = layout_str_snds_blocked;
vgmstream->meta_type = meta_STR_SNDS;
/* channels and loop flag are set by allocate_vgmstream */
if (loop_flag) {
/* just guessin', no way to set loop flag anyway */
vgmstream->loop_start_sample = 0;
vgmstream->loop_end_sample = vgmstream->num_samples;
}
/* open the file for reading by each channel */
{
int i;
vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,
STREAMFILE_DEFAULT_BUFFER_SIZE);
if (!vgmstream->ch[0].streamfile) goto fail;
for (i=0;i<channel_count;i++) {
vgmstream->ch[i].streamfile = vgmstream->ch[0].streamfile;
}
}
/* start me up */
str_snds_block_update(0,vgmstream);
return vgmstream;
/* clean up anything we may have opened */
fail:
if (vgmstream) close_vgmstream(vgmstream);
return NULL;
}
void render_vgmstream_blocked(sample * buffer, int32_t sample_count, VGMSTREAM * vgmstream) {
int samples_written=0;
int frame_size = get_vgmstream_frame_size(vgmstream);
int samples_per_frame = get_vgmstream_samples_per_frame(vgmstream);
int samples_this_block;
if (frame_size == 0) {
/* assume 4 bit */
/* TODO: get_vgmstream_frame_size() really should return bits... */
samples_this_block = vgmstream->current_block_size * 2 * samples_per_frame;
} else {
samples_this_block = vgmstream->current_block_size / frame_size * samples_per_frame;
}
while (samples_written<sample_count) {
int samples_to_do;
if (vgmstream->loop_flag && vgmstream_do_loop(vgmstream)) {
if (frame_size == 0) {
samples_this_block = vgmstream->current_block_size * 2 * samples_per_frame;
} else {
samples_this_block = vgmstream->current_block_size / frame_size * samples_per_frame;
}
continue;
}
samples_to_do = vgmstream_samples_to_do(samples_this_block, samples_per_frame, vgmstream);
if (samples_written+samples_to_do > sample_count)
samples_to_do=sample_count-samples_written;
if (vgmstream->current_block_offset>=0)
decode_vgmstream(vgmstream, samples_written, samples_to_do, buffer);
else {
int i;
/* we've run off the end! */
for (i=samples_written*vgmstream->channels;
i<(samples_written+samples_to_do)*vgmstream->channels; i++)
buffer[i]=0;
}
samples_written += samples_to_do;
vgmstream->current_sample += samples_to_do;
vgmstream->samples_into_block+=samples_to_do;
if (vgmstream->samples_into_block==samples_this_block) {
switch (vgmstream->layout_type) {
case layout_ast_blocked:
ast_block_update(vgmstream->next_block_offset,vgmstream);
break;
case layout_halpst_blocked:
if (vgmstream->next_block_offset>=0)
halpst_block_update(vgmstream->next_block_offset,vgmstream);
else
vgmstream->current_block_offset=-1;
break;
case layout_xa_blocked:
xa_block_update(vgmstream->next_block_offset,vgmstream);
break;
case layout_ea_blocked:
ea_block_update(vgmstream->next_block_offset,vgmstream);
break;
case layout_eacs_blocked:
eacs_block_update(vgmstream->next_block_offset,vgmstream);
break;
case layout_caf_blocked:
caf_block_update(vgmstream->next_block_offset,vgmstream);
break;
case layout_wsi_blocked:
wsi_block_update(vgmstream->next_block_offset,vgmstream);
break;
case layout_str_snds_blocked:
str_snds_block_update(vgmstream->next_block_offset,vgmstream);
break;
case layout_ws_aud_blocked:
ws_aud_block_update(vgmstream->next_block_offset,vgmstream);
break;
case layout_matx_blocked:
matx_block_update(vgmstream->next_block_offset,vgmstream);
break;
case layout_de2_blocked:
de2_block_update(vgmstream->next_block_offset,vgmstream);
break;
case layout_emff_ps2_blocked:
emff_ps2_block_update(vgmstream->next_block_offset,vgmstream);
break;
case layout_emff_ngc_blocked:
emff_ngc_block_update(vgmstream->next_block_offset,vgmstream);
break;
case layout_gsb_blocked:
gsb_block_update(vgmstream->next_block_offset,vgmstream);
break;
case layout_vs_blocked:
vs_block_update(vgmstream->next_block_offset,vgmstream);
break;
case layout_xvas_blocked:
xvas_block_update(vgmstream->next_block_offset,vgmstream);
break;
case layout_thp_blocked:
thp_block_update(vgmstream->next_block_offset,vgmstream);
break;
case layout_filp_blocked:
filp_block_update(vgmstream->next_block_offset,vgmstream);
break;
default:
break;
}
/* for VBR these may change */
frame_size = get_vgmstream_frame_size(vgmstream);
samples_per_frame = get_vgmstream_samples_per_frame(vgmstream);
if (frame_size == 0) {
samples_this_block = vgmstream->current_block_size * 2 * samples_per_frame;
} else {
samples_this_block = vgmstream->current_block_size / frame_size * samples_per_frame;
}
vgmstream->samples_into_block=0;
}
}
}