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70 lines
2.6 KiB
C
70 lines
2.6 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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/* tri-Ace codec file [Star Ocean 3 (PS2), Valkyrie Profile 2 (PS2), Radiata Stories (PS2)] */
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VGMSTREAM* init_vgmstream_tac(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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int loop_flag, channel_count;
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uint16_t loop_frame, frame_count, loop_discard, frame_last;
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uint32_t info_offset, loop_offset, stream_size, file_size;
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off_t start_offset;
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/* checks */
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/* (extensionless): bigfiles have no known names (libs calls mention "St*" and "Sac*" though)
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* .aac: fake for convenience given it's a tri-Ace AAC's grandpa (but don't use unless you must)
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* .pk3/.20: extremely ugly fake extensions randomly given by an old extractor, *DON'T* */
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if (!check_extensions(sf, ",aac,laac"))
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goto fail;
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/* file is validated on decoder init, early catch of simple errors (see tac_decoder_lib.h for full header) */
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info_offset = read_u32le(0x00,sf);
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if (info_offset > 0x4E000 || info_offset < 0x20) /* offset points to value inside first "block" */
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goto fail;
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loop_frame = read_u16le(0x08,sf);
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loop_discard = read_u16le(0x0a,sf);
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frame_count = read_u16le(0x0c,sf);
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frame_last = read_u16le(0x0e,sf);
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loop_offset = read_u32le(0x10,sf);
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stream_size = read_u32le(0x14,sf);
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if (stream_size % 0x4E000 != 0) /* multiple of blocks */
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goto fail;
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/* actual file can truncate last block */
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file_size = get_streamfile_size(sf);
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if (file_size > stream_size || file_size < stream_size - 0x4E000)
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goto fail;
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channel_count = 2; /* always stereo */
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loop_flag = (loop_offset != stream_size); /* actual check may be loop_frame > 0? */
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start_offset = 0;
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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_TAC;
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vgmstream->sample_rate = 48000;
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/* Frame at count/loop outputs less than full 1024 samples (thus loop or count-1 + extra).
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* A few files may pop when looping, but this seems to match game/emulator. */
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vgmstream->num_samples = (frame_count - 1) * 1024 + (frame_last + 1);
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vgmstream->loop_start_sample = (loop_frame - 1) * 1024 + loop_discard;
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vgmstream->loop_end_sample = vgmstream->num_samples;
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{
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vgmstream->codec_data = init_tac(sf);
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if (!vgmstream->codec_data) goto fail;
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vgmstream->coding_type = coding_TAC;
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vgmstream->layout_type = layout_none;
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}
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if (!vgmstream_open_stream(vgmstream, sf, 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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