VGMSTREAM * init_vgmstream_cdxa(STREAMFILE *streamFile) {
VGMSTREAM * vgmstream = NULL;
char filename[1024];
int channel_count;
int headerless=0;
int xa_channel=0;
uint8_t bCoding;
off_t start_offset;
int i;
/* check extension, case insensitive */
streamFile->get_name(streamFile,filename,sizeof(filename));
if (strcasecmp("xa",filename_extension(filename))) goto fail;
/* check RIFF Header */
if (!((read_32bitBE(0x00,streamFile) == 0x52494646) &&
(read_32bitBE(0x08,streamFile) == 0x43445841) &&
(read_32bitBE(0x0C,streamFile) == 0x666D7420)))
headerless=1;
/* First init to have the correct info of the channel */
if (!headerless) {
start_offset=init_xa_channel(&xa_channel,streamFile);
/* No sound ? */
if(start_offset==0)
goto fail;
bCoding = read_8bit(start_offset-5,streamFile);
switch (AUDIO_CODING_GET_STEREO(bCoding)) {
case 0: channel_count = 1; break;
case 1: channel_count = 2; break;
default: channel_count = 0; break;
}
/* build the VGMSTREAM */
vgmstream = allocate_vgmstream(channel_count,0);
if (!vgmstream) goto fail;
/* fill in the vital statistics */
vgmstream->channels = channel_count;
vgmstream->xa_channel = xa_channel;
switch (AUDIO_CODING_GET_FREQ(bCoding)) {
case 0: vgmstream->sample_rate = 37800; break;
case 1: vgmstream->sample_rate = 18900; break;
default: vgmstream->sample_rate = 0; break;
}
/* Check for Compression Scheme */
vgmstream->num_samples = (int32_t)((((get_streamfile_size(streamFile) - 0x3C)/2352)*0x1F80)/(2*channel_count));
} else
{
channel_count=2;
vgmstream = allocate_vgmstream(2,0);
if (!vgmstream) goto fail;
vgmstream->xa_headerless=1;
vgmstream->sample_rate=44100;
vgmstream->channels=2;
vgmstream->num_samples = (int32_t)(((get_streamfile_size(streamFile)/ 0x80)*0xE0)/2);
start_offset=0;
}
vgmstream->coding_type = coding_XA;
vgmstream->layout_type = layout_xa_blocked;
vgmstream->meta_type = meta_PSX_XA;
/* open the file for reading by each channel */
{
STREAMFILE *chstreamfile;
chstreamfile = streamFile->open(streamFile,filename,2352);
if (!chstreamfile) goto fail;
for (i=0;i<channel_count;i++) {
vgmstream->ch[i].streamfile = chstreamfile;
}
}
xa_block_update(start_offset,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;
}
}
}
