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https://github.com/vgmstream/vgmstream.git
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59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
#include "meta.h"
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#include "../util.h"
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/* Maxis XA - found in Sim City 3000 (PC), The Sims 2 (PC) */
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VGMSTREAM * init_vgmstream_maxis_xa(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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off_t start_offset;
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int avg_byte_rate, channel_count, loop_flag, resolution, sample_align, sample_rate;
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/* check extension, case insensitive */
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if (!check_extensions(streamFile,"xa"))
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goto fail;
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/* check header */
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if ((read_16bitBE(0x00,streamFile) != 0x5841)) /* "XA" */
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goto fail;
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/* check format tag */
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if ((read_16bitLE(0x08,streamFile) != 0x0001))
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goto fail;
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channel_count = read_16bitLE(0x0A,streamFile);
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sample_rate = read_32bitLE(0x0C,streamFile);
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avg_byte_rate = read_32bitLE(0x10,streamFile);
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sample_align = read_16bitLE(0x14,streamFile);
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resolution = read_16bitLE(0x16,streamFile);
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/* check alignment */
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if (sample_align != (resolution/8)*channel_count)
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goto fail;
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/* check average byte rate */
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if (avg_byte_rate != sample_rate*sample_align)
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goto fail;
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loop_flag = 0;
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start_offset = 0x18;
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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 = read_32bitLE(0x04,streamFile)/2/channel_count;
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vgmstream->meta_type = meta_MAXIS_XA;
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vgmstream->coding_type = coding_MAXIS_XA;
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vgmstream->layout_type = layout_none;
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/* open streams */
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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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