73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
#include "meta.h"
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#include "../util.h"
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#include "../coding/coding.h"
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#include "../layout/layout.h"
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/* VGS - from Guitar Hero Encore - Rocks the 80s, Guitar Hero II PS2 */
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VGMSTREAM* init_vgmstream_vgs(STREAMFILE *sf) {
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VGMSTREAM* vgmstream = NULL;
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off_t start_offset;
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size_t channel_size = 0, stream_data_size, stream_frame_count;
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int channels = 0, loop_flag = 0, sample_rate = 0, stream_sample_rate;
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int i;
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/* checks */
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if (!is_id32be(0x00,sf, "VgS!"))
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goto fail;
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/* 0x04: version? */
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if (!check_extensions(sf,"vgs"))
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goto fail;
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/* contains N streams, which can have one less frame, or half frame and sample rate */
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for (i = 0; i < 8; i++) {
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stream_sample_rate = read_32bitLE(0x08 + 0x08*i + 0x00,sf);
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stream_frame_count = read_32bitLE(0x08 + 0x08*i + 0x04,sf);
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stream_data_size = stream_frame_count*0x10;
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if (stream_sample_rate == 0)
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break;
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if (!sample_rate || !channel_size) {
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sample_rate = stream_sample_rate;
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channel_size = stream_data_size;
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}
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/* some streams end 1 frame early */
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if (channel_size - 0x10 == stream_data_size) {
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channel_size -= 0x10;
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}
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/* Guitar Hero II sometimes uses half sample rate for last stream */
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if (sample_rate != stream_sample_rate) {
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VGM_LOG("VGS: ignoring stream %i\n", i);
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//total_streams++; // todo handle substreams
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break;
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}
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channels++;
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}
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start_offset = 0x80;
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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->meta_type = meta_VGS;
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vgmstream->sample_rate = sample_rate;
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vgmstream->num_samples = ps_bytes_to_samples(channel_size * channels, channels);
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vgmstream->coding_type = coding_PSX_badflags; /* flag = stream/channel number */
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vgmstream->layout_type = layout_blocked_vgs;
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if (!vgmstream_open_stream(vgmstream, sf, 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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