mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-14 07:32:52 +01:00
98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
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#include "ast.h"
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#include "../layout/ast_blocked.h"
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#include "../util.h"
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VGMSTREAM * init_vgmstream_ast(const char * const filename) {
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VGMSTREAM * vgmstream = NULL;
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STREAMFILE * infile = NULL;
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coding_t coding_type;
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int codec_number;
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int channel_count;
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int loop_flag;
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size_t max_block;
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/* check extension, case insensitive */
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if (strcasecmp("ast",filename_extension(filename))) goto fail;
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/* try to open the file for header reading */
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infile = open_streamfile(filename);
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if (!infile) goto fail;
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/* check header */
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if ((uint32_t)read_32bitBE(0,infile)!=0x5354524D || /* "STRM" */
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read_16bitBE(0xa,infile)!=0x10 ||
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/* check that file = header (0x40) + data */
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read_32bitBE(4,infile)+0x40!=get_streamfile_size(infile))
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goto fail;
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/* check for a first block */
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if (read_32bitBE(0x40,infile)!=0x424C434B) /* "BLCK" */
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goto fail;
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/* check type details */
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codec_number = read_16bitBE(8,infile);
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loop_flag = read_16bitBE(0xe,infile);
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channel_count = read_16bitBE(0xc,infile);
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max_block = read_32bitBE(0x20,infile);
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switch (codec_number) {
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case 0:
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coding_type = coding_NGC_AFC;
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break;
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case 1:
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coding_type = coding_PCM16BE;
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break;
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default:
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goto fail;
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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_32bitBE(0x14,infile);
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vgmstream->sample_rate = read_32bitBE(0x10,infile);
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/* channels and loop flag are set by allocate_vgmstream */
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vgmstream->loop_start_sample = read_32bitBE(0x18,infile);
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vgmstream->loop_end_sample = read_32bitBE(0x1c,infile);
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vgmstream->coding_type = coding_type;
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vgmstream->layout_type = layout_ast_blocked;
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vgmstream->meta_type = meta_AST;
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close_streamfile(infile); infile=NULL;
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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<channel_count;i++) {
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vgmstream->ch[i].streamfile = open_streamfile_buffer(filename,
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(i==0?
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max_block+0x20-4: /* first buffer a bit bigger to
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read block header without
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inefficiency */
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max_block
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)
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);
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if (!vgmstream->ch[i].streamfile) goto fail;
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}
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}
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/* start me up */
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ast_block_update(0x40,vgmstream);
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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 (infile) close_streamfile(infile);
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if (vgmstream) close_vgmstream(vgmstream);
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return NULL;
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}
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