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78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
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#include "meta.h"
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#include "../coding/coding.h"
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/* .sfx - Rebellion (Asura engine) games [Sniper Elite (Wii)] */
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/* Despite what the extension implies it's used for music too */
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/* Rebellion's other DSP variants can be found in ngc_dsp_std */
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VGMSTREAM* init_vgmstream_dsp_asura_sfx(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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int channels, interleave, loop_flag;
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uint32_t nibble_count, sample_rate;
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off_t ch1_offset, ch2_offset;
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/* checks */
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if (!check_extensions(sf, "sfx"))
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return NULL;
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/* no clear header id, but this is how they all start */
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/* the 0x02s are likely channels and codec (DSPADPCM) */
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if (read_u32be(0x00, sf) != 0x00 &&
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read_u32be(0x04, sf) != 0x02 &&
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read_u32be(0x08, sf) != 0x02)
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return NULL;
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nibble_count = read_u32be(0x0C, sf);
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sample_rate = read_u32be(0x10, sf); /* always 44100? */
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/* this would likely be an array, but always 2ch so */
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ch1_offset = read_u32be(0x14, sf); /* always 0x20? */
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ch2_offset = read_u32be(0x18, sf); /* 0x10 aligned */
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interleave = ch2_offset - ch1_offset;
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/* channel header:
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* 0x00: coefs
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* 0x20: gain (0)
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* 0x22: initial ps
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* 0x30: stream start
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*/
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channels = 2;
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loop_flag = 0;
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/* more safety checks */
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if (interleave < 0 ||
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interleave < nibble_count / 2 ||
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interleave > get_streamfile_size(sf) / channels)
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goto fail;
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if (read_u16be(ch1_offset + 0x22, sf) != read_u8(ch1_offset + 0x30, sf) ||
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read_u16be(ch2_offset + 0x22, sf) != read_u8(ch2_offset + 0x30, sf))
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goto fail;
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(channels, loop_flag);
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if (!vgmstream) goto fail;
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vgmstream->sample_rate = sample_rate;
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vgmstream->meta_type = meta_DSP_ASURA;
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vgmstream->coding_type = coding_NGC_DSP;
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vgmstream->layout_type = layout_interleave;
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vgmstream->interleave_block_size = interleave;
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dsp_read_coefs_be(vgmstream, sf, ch1_offset, interleave);
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vgmstream->num_samples = dsp_nibbles_to_samples(nibble_count);
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if (!vgmstream_open_stream(vgmstream, sf, ch1_offset + 0x30))
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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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