mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-14 15:42:52 +01:00
76 lines
2.5 KiB
C
76 lines
2.5 KiB
C
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#include "meta.h"
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#include "../util.h"
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#include "../coding/coding.h"
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static int get_sk_num_samples(STREAMFILE *streamFile, off_t start_offset);
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/* AUD/SK - Silicon Knights obfuscated Ogg (cutscene/voices) [Eternal Darkness (GC)] */
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VGMSTREAM * init_vgmstream_sk_aud(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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off_t start_offset;
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int loop_flag = 0, channel_count, sample_rate;
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/* check extension, case insensitive */
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if (!check_extensions(streamFile,"aud"))
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goto fail;
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if (read_32bitBE(0x00,streamFile) != 0x11534B10) /* \11"SK"\10 */
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goto fail;
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/* the format is just mutant Ogg so actually peeking into the Vorbis id packet here */
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channel_count = read_8bit (0x23,streamFile);
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sample_rate = read_32bitLE(0x24,streamFile);
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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 = sample_rate;
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vgmstream->num_samples = get_sk_num_samples(streamFile, 0);
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vgmstream->meta_type = meta_SK_AUD;
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#ifdef VGM_USE_VORBIS
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{
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vorbis_custom_config cfg;
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memset(&cfg, 0, sizeof(vorbis_custom_config));
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vgmstream->layout_type = layout_none;
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vgmstream->coding_type = coding_VORBIS_custom;
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vgmstream->codec_data = init_vorbis_custom_codec_data(streamFile, 0x00, VORBIS_SK, &cfg);
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if (!vgmstream->codec_data) goto fail;
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start_offset = cfg.data_start_offset;
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}
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#else
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goto fail;
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#endif
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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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/* SK/Ogg doesn't have num_samples info, manually read total samples */
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static int get_sk_num_samples(STREAMFILE *streamFile, off_t start_offset) {
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uint32_t expected_id = 0x11534B10; /* \11"SK"\10 (would read "OggS" by changing the ID) */
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off_t off = get_streamfile_size(streamFile) - 4-1-1-8-4-4-4;
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/* simplest way is to find last OggS/SK page from stream end */
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while (off >= start_offset) {
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uint32_t current_id = read_32bitBE(off, streamFile);
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if (current_id == expected_id) { /* last packet starts with 0x0004, if more checks are needed */
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return read_32bitLE(off+4+1+1, streamFile); /* get last granule = total samples (64b but whatevs) */
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}
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off--;
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}
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return 0;
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}
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