mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-12 23:01:04 +01:00
106 lines
2.7 KiB
C
106 lines
2.7 KiB
C
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#include "meta.h"
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#include "../util.h"
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/* Sony PSX CD-XA */
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/* No looped file ! */
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uint8_t AUDIO_CODING_GET_STEREO(uint8_t value) {
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return (uint8_t)(value & 3);
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}
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uint8_t AUDIO_CODING_GET_FREQ(uint8_t value) {
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return (uint8_t)((value >> 2) & 3);
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}
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VGMSTREAM * init_vgmstream_cdxa(const char * const filename) {
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VGMSTREAM * vgmstream = NULL;
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STREAMFILE * infile = NULL;
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int channel_count;
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uint8_t bCoding;
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int i;
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/* check extension, case insensitive */
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if (strcasecmp("xa",filename_extension(filename))) goto fail;
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/* try to open the file for header reading */
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infile = open_streamfile(filename);
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if (!infile) goto fail;
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/* check RIFF Header */
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if (!((read_32bitBE(0x00,infile) == 0x52494646) &&
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(read_32bitBE(0x08,infile) == 0x43445841) &&
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(read_32bitBE(0x0C,infile) == 0x666D7420)))
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goto fail;
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bCoding = read_8bit(0x3F,infile);
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switch (AUDIO_CODING_GET_STEREO(bCoding)) {
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case 0: channel_count = 1; break;
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case 1: channel_count = 2; break;
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default: channel_count = 0; break;
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}
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(channel_count,0);
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if (!vgmstream) goto fail;
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/* fill in the vital statistics */
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vgmstream->channels = channel_count;
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switch (AUDIO_CODING_GET_FREQ(bCoding)) {
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case 0: vgmstream->sample_rate = 37800; break;
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case 1: vgmstream->sample_rate = 19800; break;
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default: vgmstream->sample_rate = 0; break;
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}
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/* Check for Compression Scheme */
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vgmstream->coding_type = coding_XA;
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vgmstream->num_samples = (int32_t)((((get_streamfile_size(infile) - 0x3C)/2352)*0x1F80)/(2*channel_count));
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vgmstream->layout_type = layout_xa_blocked;
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vgmstream->meta_type = meta_PSX_XA;
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close_streamfile(infile); infile=NULL;
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/* open the file for reading by each channel */
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{
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for (i=0;i<channel_count;i++) {
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vgmstream->ch[i].streamfile = open_streamfile_buffer(filename,0x8000);
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if (!vgmstream->ch[i].streamfile) goto fail;
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}
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}
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xa_block_update(init_xa_channel(0),vgmstream);
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return vgmstream;
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/* clean up anything we may have opened */
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fail:
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if (infile) close_streamfile(infile);
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if (vgmstream) close_vgmstream(vgmstream);
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return NULL;
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}
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// in extension, we can use this fonction to set the channel
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// we want to listen to ...
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off_t init_xa_channel(int channel,VGMSTREAM* vgmstream) {
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off_t block_offset=0x44;
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uint8_t currentChannel;
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uint8_t subAudio;
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vgmstream->xa_channel=channel;
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begin:
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currentChannel=read_8bit(block_offset-7,vgmstream->ch[0].streamfile);
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subAudio=read_8bit(block_offset-6,vgmstream->ch[0].streamfile);
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if ((currentChannel!=channel) && (subAudio==0x64)) {
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block_offset+=2352;
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goto begin;
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}
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return block_offset;
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}
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