mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-24 04:14:50 +01:00
113 lines
4.2 KiB
C
113 lines
4.2 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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/* FLX - from Ultima IX (.FLX is actually an archive format with sometimes sound data, let's support both anyway) */
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VGMSTREAM * init_vgmstream_flx(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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off_t start_offset, stream_offset = 0;
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size_t data_size;
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int loop_flag, channel_count, codec;
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int total_subsongs = 0, target_subsong = streamFile->stream_index;
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size_t stream_size = 0;
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/* check extensions (.flx: name of archive, files inside don't have extensions) */
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if (!check_extensions(streamFile,"flx"))
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goto fail;
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/* all spaces up to 0x50 = archive FLX */
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if (read_32bitBE(0x00,streamFile) == 0x20202020 && read_32bitBE(0x40,streamFile) == 0x20202020) {
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int i;
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int entries = read_32bitLE(0x50,streamFile);
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off_t offset = 0x80;
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if (read_32bitLE(0x54,streamFile) != 0x02
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|| read_32bitLE(0x58,streamFile) != get_streamfile_size(streamFile))
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goto fail;
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if (target_subsong == 0) target_subsong = 1;
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for (i = 0; i < entries; i++) {
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off_t entry_offset = read_32bitLE(offset + 0x00, streamFile);
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size_t entry_size = read_32bitLE(offset + 0x04, streamFile);
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offset += 0x08;
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if (entry_offset != 0x00)
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total_subsongs++; /* many entries are empty */
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if (total_subsongs == target_subsong && stream_offset == 0) {
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stream_offset = entry_offset; /* found but let's keep adding total_streams */
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stream_size = entry_size;
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}
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}
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if (target_subsong < 0 || target_subsong > total_subsongs || total_subsongs < 1) goto fail;
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if (stream_offset == 0x00) goto fail;
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}
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else {
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stream_offset = 0x00;
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stream_size = get_streamfile_size(streamFile);
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}
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if (read_32bitLE(stream_offset + 0x30,streamFile) != 0x10)
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goto fail;
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data_size = read_32bitLE(stream_offset + 0x28,streamFile);
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channel_count = read_32bitLE(stream_offset + 0x34,streamFile);
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codec = read_32bitLE(stream_offset + 0x38,streamFile);
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loop_flag = (channel_count > 1); /* full seamless repeats in music */
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start_offset = stream_offset + 0x3c;
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/* 0x00: id */
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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->sample_rate = read_32bitLE(stream_offset + 0x2c,streamFile);
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vgmstream->num_streams = total_subsongs;
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vgmstream->stream_size = stream_size;
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vgmstream->meta_type = meta_PC_FLX;
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switch(codec) {
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case 0x00: /* PCM (sfx) */
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vgmstream->coding_type = coding_PCM16LE;
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = 0x02;
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vgmstream->num_samples = pcm_bytes_to_samples(data_size, channel_count, 16);
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break;
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case 0x01: /* EA-XA (music, sfx) */
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vgmstream->coding_type = channel_count > 1 ? coding_EA_XA : coding_EA_XA_int;
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vgmstream->layout_type = layout_none;
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vgmstream->num_samples = read_32bitLE(stream_offset + 0x28,streamFile) / 0x0f*channel_count * 28; /* ea_xa_bytes_to_samples */
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vgmstream->loop_start_sample = 0;
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vgmstream->loop_end_sample = vgmstream->num_samples;
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break;
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case 0x02: /* EA-MT (voices) */
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vgmstream->coding_type = coding_EA_MT;
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vgmstream->codec_data = init_ea_mt(vgmstream->channels, 0, 0);
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if (!vgmstream->codec_data) goto fail;
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vgmstream->num_samples = read_32bitLE(start_offset,streamFile);
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start_offset += 0x04;
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break;
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default:
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VGM_LOG("FLX: unknown codec 0x%x\n", codec);
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goto fail;
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}
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read_string(vgmstream->stream_name,0x20+1, stream_offset + 0x04,streamFile);
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/* open the file for reading */
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if ( !vgmstream_open_stream(vgmstream, streamFile, start_offset) )
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goto fail;
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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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