mirror of
https://github.com/vgmstream/vgmstream.git
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72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
#include "meta.h"
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#include "../util.h"
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#include "../coding/coding.h"
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/* .rsf - from Metroid Prime */
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VGMSTREAM* init_vgmstream_rsf(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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int channels, loop_flag;
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uint32_t interleave, file_size;
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/* checks */
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if (!check_extensions(sf,"rsf"))
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goto fail;
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/* this is all we have to go on, rsf is completely headerless */
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file_size = get_streamfile_size(sf);
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interleave = (file_size + 1) / 2;
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/* G.721 has no zero nibbles, so we look at the first few bytes
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* (known files start with 0xFFFFFFFF, but probably an oddity of the codec) */
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{
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uint8_t test_byte;
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off_t i;
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/* 0x20 is arbitrary, all files are much larger */
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for (i = 0; i < 0x20; i++) {
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test_byte = read_u8(i,sf);
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if (!(test_byte&0xf) || !(test_byte&0xf0)) goto fail;
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}
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/* and also check start of second channel */
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for (i = interleave; i < interleave + 0x20; i++) {
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test_byte = read_u8(i,sf);
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if (!(test_byte&0xf) || !(test_byte&0xf0)) goto fail;
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}
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}
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channels = 2;
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loop_flag = 0;
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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->num_samples = file_size;
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vgmstream->sample_rate = 32000;
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vgmstream->coding_type = coding_G721;
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vgmstream->layout_type = layout_none;
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vgmstream->meta_type = meta_RSF;
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if (!vgmstream_open_stream(vgmstream, sf, 0))
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goto fail;
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/* open the file for reading by each channel */
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{
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int i;
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for (i = 0; i < channels; i++) {
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vgmstream->ch[i].channel_start_offset= vgmstream->ch[i].offset = interleave * i;
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g72x_init_state(&(vgmstream->ch[i].g72x_state));
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}
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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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