mirror of
https://github.com/vgmstream/vgmstream.git
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61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
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#include "meta.h"
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#include "../coding/coding.h"
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#include "ppst_streamfile.h"
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/* PPST - ParaPpa STream (maybe), extracted from .img bigfile [Parappa the Rapper (PSP)] */
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VGMSTREAM * init_vgmstream_ppst(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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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, "sng"))
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goto fail;
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if (read_32bitBE(0x00,streamFile) != 0x50505354) /* "PPST" */
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goto fail;
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/* header has some control and comment fields then interleaved RIFF .at3 */
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/* count subsongs (mainly 4, rarely 1) */
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{
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off_t offset = 0xa0;
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total_subsongs = 0;
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while (offset < 0x800) {
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if (read_32bitLE(offset + 0x04, streamFile) == 0) /* subsong size */
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break;
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total_subsongs++;
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offset += 0x08;
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}
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VGM_LOG("st=%lx\n", total_subsongs);
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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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}
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{
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off_t start_offset = 0x800;
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size_t interleave_size = 0x4000;
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size_t stride_size = 0x4000*total_subsongs;
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/* subsong header at 0xa0, 0x00(1): id, 0x01(3): blocks of interleave */
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size_t stream_size = read_32bitLE(0xA0+0x08*(target_subsong-1)+0x04, streamFile);
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STREAMFILE* temp_streamFile = setup_ppst_streamfile(streamFile, start_offset+interleave_size*(target_subsong-1), interleave_size, stride_size, stream_size);
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if (!temp_streamFile) goto fail;
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vgmstream = init_vgmstream_riff(temp_streamFile);
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close_streamfile(temp_streamFile);
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if (!vgmstream) goto fail;
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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_PPST;
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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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