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https://github.com/vgmstream/vgmstream.git
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295 lines
11 KiB
C
295 lines
11 KiB
C
#include "meta.h"
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#include "../layout/layout.h"
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/* for reading integers inexplicably packed into 80-bit ('double extended') floats */
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static uint32_t read80bitSANE(off_t offset, STREAMFILE *streamFile) {
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uint8_t buf[10];
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int32_t exponent;
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int32_t mantissa;
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int i;
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if (read_streamfile(buf,offset,10,streamFile) != 10) return 0;
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exponent = ((buf[0]<<8)|(buf[1]))&0x7fff;
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exponent -= 16383;
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mantissa = 0;
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for (i=0;i<8;i++) {
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int32_t shift = exponent-7-i*8;
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if (shift >= 0)
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mantissa |= buf[i+2] << shift;
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else if (shift > -8)
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mantissa |= buf[i+2] >> -shift;
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}
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return mantissa*((buf[0]&0x80)?-1:1);
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}
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static uint32_t find_marker(STREAMFILE *streamFile, off_t MarkerChunkOffset, int marker_id) {
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uint16_t marker_count;
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int i;
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off_t marker_offset;
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marker_count = read_16bitBE(MarkerChunkOffset+8,streamFile);
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marker_offset = MarkerChunkOffset+10;
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for (i=0;i<marker_count;i++) {
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int name_length;
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if (read_16bitBE(marker_offset,streamFile) == marker_id)
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return read_32bitBE(marker_offset+2,streamFile);
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name_length = (uint8_t)read_8bit(marker_offset+6,streamFile) + 1;
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if (name_length % 2) name_length++;
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marker_offset += 6 + name_length;
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}
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return -1;
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}
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/* Audio Interchange File Format AIFF/AIFF-C - from Mac/3DO games */
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VGMSTREAM * init_vgmstream_aifc(STREAMFILE *streamFile) {
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VGMSTREAM * vgmstream = NULL;
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off_t start_offset = 0;
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size_t file_size;
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coding_t coding_type = 0;
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int channel_count = 0, sample_count = 0, sample_size = 0, sample_rate = 0;
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int interleave = 0;
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int loop_flag = 0;
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int32_t loop_start = 0, loop_end = 0;
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int is_aiff_ext = 0, is_aifc_ext = 0, is_aiff = 0, is_aifc = 0;
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int FormatVersionChunkFound = 0, CommonChunkFound = 0, SoundDataChunkFound = 0, MarkerChunkFound = 0, InstrumentChunkFound = 0;
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off_t MarkerChunkOffset = -1, InstrumentChunkOffset = -1;
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/* checks */
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/* .aif: common (AIFF or AIFC), .aiff: common AIFF, .aifc: common AIFC
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* .cbd2: M2 games
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* .bgm: Super Street Fighter II Turbo (3DO)
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* .acm: Crusader - No Remorse (SAT)
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* .adp: Sonic Jam (SAT)
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* .ai: Dragon Force (SAT)
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* .aifcl/aiffl: for plugins? */
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if (check_extensions(streamFile, "aif")) {
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is_aifc_ext = 1;
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is_aiff_ext = 1;
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}
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else if (check_extensions(streamFile, "aifc,aifcl,afc,cbd2,bgm")) {
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is_aifc_ext = 1;
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}
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else if (check_extensions(streamFile, "aiff,acm,adp,ai,aiffl")) {
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is_aiff_ext = 1;
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}
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else {
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goto fail;
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}
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file_size = get_streamfile_size(streamFile);
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if ((uint32_t)read_32bitBE(0x00,streamFile) != 0x464F524D && /* "FORM" */
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(uint32_t)read_32bitBE(0x04,streamFile)+0x08 != file_size)
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goto fail;
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if ((uint32_t)read_32bitBE(0x08,streamFile) == 0x41494643) { /* "AIFC" */
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if (!is_aifc_ext) goto fail;
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is_aifc = 1;
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}
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else if ((uint32_t)read_32bitBE(0x08,streamFile) == 0x41494646) { /* "AIFF" */
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if (!is_aiff_ext) goto fail;
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is_aiff = 1;
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}
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else {
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goto fail;
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}
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/* read through chunks to verify format and find metadata */
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{
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off_t current_chunk = 0x0c; /* start with first chunk within FORM */
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while (current_chunk < file_size) {
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uint32_t chunk_type = read_32bitBE(current_chunk,streamFile);
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off_t chunk_size = read_32bitBE(current_chunk+0x04,streamFile);
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/* chunks must be padded to an even number of bytes but chunk
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* size does not include that padding */
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if (chunk_size % 2) chunk_size++;
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if (current_chunk+8+chunk_size > file_size) goto fail;
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switch(chunk_type) {
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case 0x46564552: /* "FVER" (version info) */
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if (FormatVersionChunkFound) goto fail;
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if (is_aiff) goto fail; /* plain AIFF shouldn't have */
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FormatVersionChunkFound = 1;
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/* specific size */
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if (chunk_size != 4) goto fail;
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/* Version 1 of AIFF-C spec timestamp */
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if ((uint32_t)read_32bitBE(current_chunk+0x08,streamFile) != 0xA2805140) goto fail;
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break;
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case 0x434F4D4D: /* "COMM" (main header) */
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if (CommonChunkFound) goto fail;
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CommonChunkFound = 1;
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channel_count = read_16bitBE(current_chunk+8,streamFile);
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if (channel_count <= 0) goto fail;
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sample_count = (uint32_t)read_32bitBE(current_chunk+0x0a,streamFile); /* sometimes number of blocks */
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sample_size = read_16bitBE(current_chunk+0x0e,streamFile);
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sample_rate = read80bitSANE(current_chunk+0x10,streamFile);
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if (is_aifc) {
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switch (read_32bitBE(current_chunk+0x1a,streamFile)) {
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case 0x53445832: /* "SDX2" [3DO games: Super Street Fighter II Turbo (3DO), etc] */
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coding_type = coding_SDX2;
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interleave = 0x01;
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break;
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case 0x43424432: /* "CBD2" [M2 (arcade 3DO) games: IMSA Racing (M2), etc] */
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coding_type = coding_CBD2;
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interleave = 0x01;
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break;
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case 0x41445034: /* "ADP4" */
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coding_type = coding_DVI_IMA_int;
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if (channel_count != 1) break; /* don't know how stereo DVI is laid out */
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break;
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case 0x696D6134: /* "ima4" [Alida (PC), Lunar SSS (iOS)] */
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coding_type = coding_APPLE_IMA4;
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interleave = 0x22;
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sample_count = sample_count * ((interleave-0x2)*2);
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break;
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default:
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VGM_LOG("AIFC: unknown codec\n");
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goto fail;
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}
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/* string size and human-readable AIFF-C codec follows */
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}
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else if (is_aiff) {
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switch (sample_size) {
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case 8:
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coding_type = coding_PCM8;
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interleave = 1;
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break;
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case 16:
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coding_type = coding_PCM16BE;
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interleave = 2;
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break;
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case 4: /* Crusader: No Remorse (SAT), Road Rash (3DO) */
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coding_type = coding_XA;
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break;
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default:
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VGM_LOG("AIFF: unknown codec\n");
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goto fail;
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}
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}
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break;
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case 0x53534E44: /* "SSND" (main data) */
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case 0x4150434D: /* "APCM" (main data for XA) */
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if (SoundDataChunkFound) goto fail;
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SoundDataChunkFound = 1;
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start_offset = current_chunk + 0x10 + read_32bitBE(current_chunk+0x08,streamFile);
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/* when "APCM" XA frame size is at 0x0c, fixed to 0x914 */
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break;
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case 0x4D41524B: /* "MARK" (loops) */
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if (MarkerChunkFound) goto fail;
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MarkerChunkFound = 1;
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MarkerChunkOffset = current_chunk;
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break;
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case 0x494E5354: /* "INST" (loops) */
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if (InstrumentChunkFound) goto fail;
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InstrumentChunkFound = 1;
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InstrumentChunkOffset = current_chunk;
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break;
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default:
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/* spec says we can skip unrecognized chunks */
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break;
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}
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current_chunk += 0x08+chunk_size;
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}
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}
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if (is_aifc) {
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if (!FormatVersionChunkFound || !CommonChunkFound || !SoundDataChunkFound)
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goto fail;
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} else if (is_aiff) {
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if (!CommonChunkFound || !SoundDataChunkFound)
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goto fail;
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}
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/* read loop points */
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if (InstrumentChunkFound && MarkerChunkFound) {
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int start_marker;
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int end_marker;
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/* use the sustain loop */
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/* if playMode=ForwardLooping */
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if (read_16bitBE(InstrumentChunkOffset+16,streamFile) == 1) {
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start_marker = read_16bitBE(InstrumentChunkOffset+18,streamFile);
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end_marker = read_16bitBE(InstrumentChunkOffset+20,streamFile);
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/* check for sustain markers != 0 (invalid marker no) */
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if (start_marker && end_marker) {
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/* find start marker */
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loop_start = find_marker(streamFile,MarkerChunkOffset,start_marker);
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loop_end = find_marker(streamFile,MarkerChunkOffset,end_marker);
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/* find_marker is type uint32_t as the spec says that's the type
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* of the position value, but it returns a -1 on error, and the
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* loop_start and loop_end variables are int32_t, so the error
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* will become apparent.
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* We shouldn't have a loop point that overflows an int32_t
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* anyway. */
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loop_flag = 1;
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if (loop_start==loop_end)
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loop_flag = 0;
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}
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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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vgmstream->sample_rate = sample_rate;
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vgmstream->num_samples = sample_count;
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vgmstream->loop_start_sample = loop_start;
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vgmstream->loop_end_sample = loop_end;
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vgmstream->coding_type = coding_type;
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if (coding_type == coding_XA) {
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vgmstream->layout_type = layout_blocked_xa_aiff;
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/* AIFF XA can use sample rates other than 37800/18900 */
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/* some Crusader: No Remorse tracks have XA headers with incorrect 0xFF, rip bug/encoder feature? */
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}
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else {
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vgmstream->layout_type = (channel_count > 1) ? layout_interleave : layout_none;
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vgmstream->interleave_block_size = interleave;
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}
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if (is_aifc)
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vgmstream->meta_type = meta_AIFC;
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else if (is_aiff)
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vgmstream->meta_type = meta_AIFF;
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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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