mirror of
https://github.com/vgmstream/vgmstream.git
synced 2024-12-19 18:05:52 +01:00
75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
#include "meta.h"
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#include "../util.h"
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/* .agsc - from Metroid Prime 2 */
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VGMSTREAM * init_vgmstream_agsc(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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char filename[PATH_LIMIT];
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off_t header_offset;
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off_t start_offset;
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int channel_count;
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int i;
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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("agsc",filename_extension(filename))) goto fail;
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/* check header */
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if ((uint32_t)read_32bitBE(0,streamFile)!=0x00000001)
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goto fail;
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/* count length of name, including terminating 0 */
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for (header_offset=4;header_offset < get_streamfile_size(streamFile) && read_8bit(header_offset,streamFile)!='\0';header_offset++);
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header_offset ++;
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channel_count = 1;
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(1,1);
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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(header_offset+0xda,streamFile);
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vgmstream->sample_rate = (uint16_t)read_16bitBE(header_offset+0xd8,streamFile);
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vgmstream->loop_start_sample = read_32bitBE(header_offset+0xde,streamFile);
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/* this is cute, we actually have a "loop length" */
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vgmstream->loop_end_sample = (vgmstream->loop_start_sample + read_32bitBE(header_offset+0xe2,streamFile))-1;
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vgmstream->coding_type = coding_NGC_DSP;
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vgmstream->layout_type = layout_none;
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vgmstream->meta_type = meta_AGSC;
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vgmstream->allow_dual_stereo = 1;
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for (i=0;i<16;i++) {
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vgmstream->ch[0].adpcm_coef[i]=read_16bitBE(header_offset+0xf6+i*2,streamFile);
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}
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start_offset = header_offset+0x116;
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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 = streamFile->open(streamFile,filename,STREAMFILE_DEFAULT_BUFFER_SIZE);
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if (!vgmstream->ch[i].streamfile) goto fail;
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vgmstream->ch[i].channel_start_offset=
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vgmstream->ch[i].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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