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76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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/* VAS - Manhunt 2 [PSP] blocked audio format */
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VGMSTREAM* init_vgmstream_vas_rockstar(STREAMFILE* sf) {
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VGMSTREAM* vgmstream = NULL;
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off_t stream_offset;
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size_t data_size, stream_size, block_size = 0x40;
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int sample_rate, num_streams, channels, loop_flag = 0;
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int is_v2, target_subsong = sf->stream_index;
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/* checks */
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/* VAGs: v1, used in prerelease builds
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* 2AGs: v2, used in the final release */
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if (!is_id32be(0x00, sf, "VAGs") && !is_id32be(0x00, sf, "2AGs"))
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return NULL;
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if (!check_extensions(sf, "vas"))
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return NULL;
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/* parse header */
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data_size = read_u32le(0x04, sf);
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sample_rate = read_u16le(0x08, sf);
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if (read_u8(0x0A, sf)) goto fail; /* always 0? */
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num_streams = read_u8(0x0B, sf);
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if (target_subsong < 0 || num_streams < 1 || num_streams > 32) goto fail;
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if (!target_subsong) target_subsong = 1;
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channels = 1; /* might be read_u8(0x0A, sf) + 1? */
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/* set up stream */
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is_v2 = read_u8(0x00, sf) == 0x32; /* 2AGs */
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stream_offset = 0x0C;
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/* only in v2, 32 byte buffer of the intended order for stream blocks(?) */
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/* always 00 01 02 03 04 05 06 in the multi-stream music/ambience files */
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if (is_v2) stream_offset += 0x20;
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/* might conflict with the standard VAG otherwise */
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if (data_size + stream_offset != get_streamfile_size(sf))
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goto fail;
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target_subsong -= 1; /* zero index */
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/* currently threre are no known v1 multi-stream blocked sounds, prerelease
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* builds also use v2 for those, but this should be how v1 works in theory */
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stream_offset += block_size * (is_v2 ? read_u8(0x0C + target_subsong, sf) : target_subsong);
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stream_size = data_size / num_streams;
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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_VAS_ROCKSTAR;
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vgmstream->coding_type = coding_PSX;
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vgmstream->num_streams = num_streams;
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vgmstream->sample_rate = sample_rate;
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vgmstream->stream_size = stream_size;
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vgmstream->interleave_block_size = 0;
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vgmstream->layout_type = layout_blocked_vas;
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vgmstream->num_samples = ps_bytes_to_samples(stream_size, channels);
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if (!vgmstream_open_stream(vgmstream, sf, stream_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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