mirror of
https://github.com/vgmstream/vgmstream.git
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116 lines
3.9 KiB
C
116 lines
3.9 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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/* .IMC - from iNiS Gitaroo Man (PS2) */
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VGMSTREAM * init_vgmstream_imc(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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off_t start_offset;
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int loop_flag, channel_count, sample_rate, interleave, blocks;
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size_t file_size, data_size;
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/* checks */
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/* .imc: extension from the main container */
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if (!check_extensions(streamFile, "imc"))
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goto fail;
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channel_count = read_32bitLE(0x00, streamFile);
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sample_rate = read_32bitLE(0x04, streamFile);
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interleave = read_32bitLE(0x08, streamFile) * 0x10; /* number of frames in a block */
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blocks = read_32bitLE(0x0c, streamFile); /* number of interleave blocks (even in mono) */
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file_size = get_streamfile_size(streamFile);
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loop_flag = 0;
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start_offset = 0x10;
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/* extra checks since the header is so simple */
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if (channel_count < 1 || channel_count > 8)
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goto fail;
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if (sample_rate < 11025 || sample_rate > 48000)
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/* game can play 11025, 16000, 22050, 32000, 44100, 48000. Anything else will be
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silent in-game. ST10.IMC subsongs 42-47 use 22000, those are unused silent audio */
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goto fail;
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if (interleave*blocks + start_offset != file_size)
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goto fail;
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data_size = file_size - start_offset;
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data_size -= ps_find_padding(streamFile, start_offset, data_size, channel_count, interleave, 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_IMC;
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vgmstream->sample_rate = sample_rate;
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vgmstream->num_samples = ps_bytes_to_samples(data_size, channel_count);
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vgmstream->coding_type = coding_PSX;
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = interleave;
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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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/* ****************************************************************************** */
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/* .IMC in containers */
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VGMSTREAM * init_vgmstream_imc_container(STREAMFILE *streamFile) {
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VGMSTREAM *vgmstream = NULL;
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STREAMFILE *temp_streamFile = NULL;
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off_t header_offset, subfile_offset, next_offset, name_offset;
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size_t subfile_size;
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int total_subsongs, target_subsong = streamFile->stream_index;
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/* checks */
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if (!check_extensions(streamFile, "imc"))
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goto fail;
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total_subsongs = read_32bitLE(0x00, streamFile);
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if (target_subsong == 0) target_subsong = 1;
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if (target_subsong < 0 || target_subsong > total_subsongs || total_subsongs < 1) goto fail;
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header_offset = 0x04 + 0x20*(target_subsong-1);
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name_offset = header_offset + 0x00;
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/* 0x08: flags? (0x702ADE77|0x002ADE77|0x20000000|etc) */
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/* 0x0c: same for all songs in single .imc but varies between .imc */
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subfile_offset = read_32bitLE(header_offset + 0x10,streamFile);
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/* 0x14: flags/size? (0xF0950000|0x3CFA1200|etc) */
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/* 0x18: same for all songs in single .imc but varies between .imc */
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/* 0x1c: flags? (0 or 2) */
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if (target_subsong == total_subsongs) {
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next_offset = get_streamfile_size(streamFile);
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}
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else {
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next_offset = read_32bitLE(header_offset + 0x20 + 0x10,streamFile);
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}
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subfile_size = next_offset - subfile_offset;
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temp_streamFile = setup_subfile_streamfile(streamFile, subfile_offset,subfile_size, NULL);
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if (!temp_streamFile) goto fail;
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vgmstream = init_vgmstream_imc(temp_streamFile);
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if (!vgmstream) goto fail;
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close_streamfile(temp_streamFile);
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vgmstream->num_streams = total_subsongs;
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read_string(vgmstream->stream_name,0x08+1, name_offset,streamFile);
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return vgmstream;
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fail:
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close_streamfile(temp_streamFile);
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close_vgmstream(vgmstream);
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return NULL;
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}
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