mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-19 09:55:53 +01:00
107 lines
3.4 KiB
C
107 lines
3.4 KiB
C
#include "meta.h"
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#include "../layout/layout.h"
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#include "../coding/coding.h"
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#include <string.h>
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static int get_adm_loop_info(STREAMFILE *streamFile, off_t *loop_start_offset);
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/* .adm - from Dragon Quest V (PS2) */
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VGMSTREAM * init_vgmstream_ps2_adm(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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int channel_count, loop_flag = 0;
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off_t start_offset, loop_start_offset = 0;
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/* checks */
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if (!check_extensions(streamFile,"adm"))
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goto fail;
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/* raw data, but test some .ADM blocks as they always start with PS-ADPCM flag 0x06 every 0x1000 */
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{
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int i;
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for (i = 0; i < 10; i++) {
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if (read_8bit(0x1000*i + 0x01, streamFile) != 0x06)
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goto fail;
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}
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}
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start_offset = 0x00;
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loop_flag = get_adm_loop_info(streamFile, &loop_start_offset);
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channel_count = 2;
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(channel_count,loop_flag);
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if (!vgmstream) goto fail;
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vgmstream->meta_type = meta_PS2_ADM;
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vgmstream->sample_rate = 44100;
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vgmstream->coding_type = coding_PSX;
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vgmstream->layout_type = layout_blocked_adm;
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if (!vgmstream_open_stream(vgmstream,streamFile,start_offset))
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goto fail;
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/* calc num_samples as playable data size varies between files/blocks */
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{
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vgmstream->next_block_offset = start_offset;
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do {
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block_update(vgmstream->next_block_offset,vgmstream);
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if (loop_flag && vgmstream->current_block_offset == loop_start_offset)
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vgmstream->loop_start_sample = vgmstream->num_samples;
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vgmstream->num_samples += ps_bytes_to_samples(vgmstream->current_block_size, 1);
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}
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while (vgmstream->next_block_offset < get_streamfile_size(streamFile));
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block_update(start_offset,vgmstream);
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if (loop_flag)
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vgmstream->loop_end_sample = vgmstream->num_samples;
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}
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return vgmstream;
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fail:
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close_vgmstream(vgmstream);
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return NULL;
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}
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/* loops are not in the .ADM or .DAT bigfile containing them but in the exe; manually get them (a bit meh but whatevs) */
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static int get_adm_loop_info(STREAMFILE *streamFile, off_t *loop_start_offset) {
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char file_name[PATH_LIMIT];
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char index_name[PATH_LIMIT];
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STREAMFILE *streamExe = NULL;
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int i, name_index = -1, loop_flag;
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off_t offset;
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streamExe = open_streamfile_by_filename(streamFile, "SLPM_655.55");
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if (!streamExe) goto fail;
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get_streamfile_filename(streamFile, file_name, PATH_LIMIT);
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/* get file index from name list (file_name == index_name = index number */
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offset = 0x23B3c0;
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for (i = 0; i < 51; i++) {
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read_string(index_name,0x20+1, offset,streamExe);
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if (strcmp(index_name, file_name)==0) {
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name_index = i;
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break;
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}
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offset += 0x20;
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}
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if (name_index < 0)
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goto fail;
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/* get file info using index */
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offset = 0x23BAEC + 0x1c*name_index;
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loop_flag = (read_32bitLE(offset + 0x10, streamExe) == 0); /* 1: don't loop, 0: loop */
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if (loop_flag) { /* loop flag */
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*loop_start_offset = read_32bitLE(offset + 0x04, streamExe);
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}
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/* 0x08: num_samples/loop_end, 0x0c: sample rate (always 44100), 0x14/18: some size? */
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close_streamfile(streamExe);
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return loop_flag;
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fail:
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close_streamfile(streamExe);
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return 0;
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}
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