83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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#include "../util.h"
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/* AHX - CRI format mainly for voices, contains MPEG-2 Layer 2 audio with lying frame headers */
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VGMSTREAM * init_vgmstream_ahx(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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off_t start_offset;
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int channel_count = 1, loop_flag = 0, type;
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/* check extension, case insensitive */
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if ( !check_extensions(streamFile, "ahx") ) goto fail;
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/* check first 2 bytes */
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if ((uint16_t)read_16bitBE(0,streamFile)!=0x8000) goto fail;
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/* get stream offset, check for CRI signature just before */
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start_offset = (uint16_t)read_16bitBE(0x02,streamFile) + 0x04;
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if ((uint16_t)read_16bitBE(start_offset-0x06,streamFile)!=0x2863 || /* "(c" */
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(uint32_t)read_32bitBE(start_offset-0x04,streamFile)!=0x29435249) /* ")CRI" */
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goto fail;
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/* check for encoding type (0x10 is AHX for DC with bigger frames, 0x11 is AHX, 0x0N are ADX) */
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type = read_8bit(0x04,streamFile);
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if (type != 0x10 && type != 0x11) goto fail;
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/* check for frame size (0 for AHX) */
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if (read_8bit(0x05,streamFile) != 0) goto fail;
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/* check for bits per sample? (0 for AHX) */
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if (read_8bit(0x06,streamFile) != 0) goto fail;
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/* check channel count (only mono AHXs can be created by the encoder) */
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if (read_8bit(0x07,streamFile) != 1) goto fail;
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/* check version signature */
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if (read_8bit(0x12,streamFile) != 0x06) goto fail;
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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 = read_32bitBE(0x08,streamFile); /* real sample rate */
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vgmstream->num_samples = read_32bitBE(0x0c,streamFile); /* doesn't include encoder_delay (handled in decoder) */
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vgmstream->meta_type = meta_AHX;
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{
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#ifdef VGM_USE_MPEG
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mpeg_custom_config cfg = {0};
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cfg.encryption = read_8bit(0x13,streamFile); /* 0x08 = keyword encryption */
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cfg.cri_type = type;
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if (cfg.encryption) {
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uint8_t keybuf[6];
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if (read_key_file(keybuf, 6, streamFile) == 6) {
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cfg.cri_key1 = get_16bitBE(keybuf+0);
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cfg.cri_key2 = get_16bitBE(keybuf+2);
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cfg.cri_key3 = get_16bitBE(keybuf+4);
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}
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}
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vgmstream->layout_type = layout_none;
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vgmstream->codec_data = init_mpeg_custom(streamFile, start_offset, &vgmstream->coding_type, channel_count, MPEG_AHX, &cfg);
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if (!vgmstream->codec_data) goto fail;
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#else
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goto fail;
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#endif
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}
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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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