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https://github.com/vgmstream/vgmstream.git
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f6417c5430
There is not no real about having small-ish buffers, simplifies buffer tuning, and avoids having gigantic buffers on bad reads.
94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
#include "meta.h"
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#include "../layout/layout.h"
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#include "../util.h"
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/* .smp file, with MS ADPCM. From Ghostbusters (PC). */
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VGMSTREAM * init_vgmstream_pc_smp(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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char filename[PATH_LIMIT];
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int channel_count;
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off_t start_offset;
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int interleave;
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int loop_flag = 0;
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/* check extension, case insensitive */
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streamFile->get_name(streamFile,filename,sizeof(filename));
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if (strcasecmp("smp",filename_extension(filename))) goto fail;
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/* 6? */
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if (6 != read_32bitLE(0,streamFile)) goto fail;
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if (0 != read_32bitLE(0x14,streamFile)) goto fail;
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if (4 != read_32bitLE(0x24,streamFile)) goto fail;
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if (4 != read_32bitLE(0x2C,streamFile)) goto fail;
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start_offset = read_32bitLE(0x1c, streamFile);
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/* check body start + body size = total size */
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if (start_offset + read_32bitLE(0x20,streamFile) != get_streamfile_size(streamFile)) goto fail;
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/* might also be codec id? */
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channel_count = read_32bitLE(0x28,streamFile);
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if (channel_count != 1 && channel_count != 2) goto fail;
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/* verify MS ADPCM codec setup */
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{
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int i;
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/* coefficients and statement of 0x100 samples per block?? */
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static const uint8_t ms_setup[0x20] = {
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0x00,0x01,0x07,0x00,0x00,0x01,0x00,0x00,
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0x00,0x02,0x00,0xFF,0x00,0x00,0x00,0x00,
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0xC0,0x00,0x40,0x00,0xF0,0x00,0x00,0x00,
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0xCC,0x01,0x30,0xFF,0x88,0x01,0x18,0xFF};
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for (i = 0; i < 0x20; i++)
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{
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if ((uint8_t)read_8bit(0x34+i,streamFile) != ms_setup[i]) goto fail;
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}
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/* verify padding */
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for (i = 0x20; i+0x34 < start_offset; i++)
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{
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if (read_8bit(0x34+i,streamFile) != 0) goto fail;
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}
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}
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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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/* fill in the vital statistics */
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vgmstream->num_samples = read_32bitLE(0x18,streamFile);
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vgmstream->sample_rate = read_32bitLE(0x30,streamFile);
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vgmstream->coding_type = coding_MSADPCM;
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vgmstream->layout_type = layout_none; // MS ADPCM does own interleave
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interleave = 0x86*channel_count;
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vgmstream->interleave_block_size = interleave;
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vgmstream->meta_type = meta_PC_SMP;
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/* open the file, set up each channel */
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{
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int i;
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vgmstream->ch[0].streamfile = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
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if (!vgmstream->ch[0].streamfile) goto fail;
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for (i=0;i<channel_count;i++) {
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vgmstream->ch[i].streamfile = vgmstream->ch[0].streamfile;
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vgmstream->ch[i].offset = vgmstream->ch[i].channel_start_offset =
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start_offset;
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}
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}
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return vgmstream;
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/* clean up anything we may have opened */
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fail:
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if (vgmstream) close_vgmstream(vgmstream);
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return NULL;
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}
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