mirror of
https://github.com/vgmstream/vgmstream.git
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333 lines
12 KiB
C
333 lines
12 KiB
C
#include "meta.h"
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#include "../coding/coding.h"
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#include "../layout/layout.h"
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#define EA_CODEC_PCM 0x00
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#define EA_CODEC_ULAW 0x01
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#define EA_CODEC_IMA 0x02
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#define EA_CODEC_PSX 0xFF //fake value
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typedef struct {
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int32_t sample_rate;
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uint8_t bits;
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uint8_t channels;
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uint8_t codec;
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uint8_t type;
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int32_t num_samples;
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int32_t loop_start;
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int32_t loop_end;
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int32_t loop_start_offset;
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int32_t data_offset;
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int big_endian;
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int loop_flag;
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int is_sead;
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int codec_config;
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int is_bank;
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int total_subsongs;
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} ea_header;
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static int parse_header(STREAMFILE* streamFile, ea_header* ea, off_t begin_offset);
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static VGMSTREAM * init_vgmstream_main(STREAMFILE *streamFile, ea_header* ea);
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static void set_ea_1snh_num_samples(STREAMFILE* streamFile, off_t start_offset, ea_header* ea);
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static int get_ea_1snh_ima_version(STREAMFILE* streamFile, off_t start_offset, const ea_header* ea);
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/* EA 1SNh - from early EA games, stream (~1996, ex. Need for Speed) */
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VGMSTREAM * init_vgmstream_ea_1snh(STREAMFILE *streamFile) {
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ea_header ea = {0};
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off_t eacs_offset;
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/* checks */
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/* .asf/as4: common,
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* .lasf: fake for plugins
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* .cnk: some PS games
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* .sng: fake for plugins (to mimic EA SCHl's common extension)
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* .uv/tgq: some SAT games (video only?) */
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if (!check_extensions(streamFile,"asf,lasf,as4,cnk,sng,uv,tgq"))
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goto fail;
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if (read_32bitBE(0x00,streamFile) != 0x31534E68 && /* "1SNh" */
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read_32bitBE(0x00,streamFile) != 0x53454144) /* "SEAD" */
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goto fail;
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/* stream is divided into blocks/chunks: 1SNh=audio header, 1SNd=data xN, 1SNl=loop end, 1SNe=end.
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* Video uses various blocks (kVGT/fVGT/etc) and sometimes alt audio blocks (SEAD/SNDC/SEND). */
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ea.is_sead = read_32bitBE(0x00,streamFile) == 0x53454144;
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/* use block size as endian marker (Saturn = BE) */
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ea.big_endian = guess_endianness32bit(0x04,streamFile);
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eacs_offset = 0x08; /* after 1SNh block id+size */
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if (!parse_header(streamFile,&ea, eacs_offset))
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goto fail;
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return init_vgmstream_main(streamFile, &ea);
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fail:
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return NULL;
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}
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/* EA EACS - from early EA games, bank (~1996, ex. Need for Speed) */
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VGMSTREAM * init_vgmstream_ea_eacs(STREAMFILE *streamFile) {
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ea_header ea = {0};
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off_t eacs_offset;
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/* checks */
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/* .eas: single bank [Need for Speed (PC)]
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* .bnk: multi bank [Need for Speed (PC)] */
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if (!check_extensions(streamFile,"eas,bnk"))
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goto fail;
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/* plain data without blocks, can contain N*(EACS header) + N*(data), or N (EACS header + data) */
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ea.is_bank = 1;
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/* use ??? as endian marker (Saturn = BE) */
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//ea.big_endian = guess_endianness32bit(0x04,streamFile);
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if (read_32bitBE(0x00,streamFile) == 0x45414353) { /* "EACS" */
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/* single bank variant */
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eacs_offset = 0x00;
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}
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else if (read_32bitBE(0x00,streamFile) == 0x00) {
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/* multi bank variant */
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int i;
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int target_subsong = streamFile->stream_index;
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if (target_subsong == 0) target_subsong = 1;
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if (target_subsong < 0) goto fail;
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/* offsets to EACSs are scattered in the first 0x200
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* this looks dumb but seems like the only way */
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eacs_offset = 0;
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for (i = 0x00; i < 0x200; i += 0x04) {
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off_t bank_offset = read_32bitLE(i, streamFile);
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if (bank_offset == 0)
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continue;
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ea.total_subsongs++;
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/* parse mini bank header */
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if (ea.total_subsongs == target_subsong) {
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/* 0x00: some id or flags? */
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eacs_offset = read_32bitLE(bank_offset + 0x04, streamFile);
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/* rest: not sure if part of this header */
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}
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}
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if (eacs_offset == 0)
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goto fail;
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}
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else {
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goto fail;
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}
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if (!parse_header(streamFile,&ea, eacs_offset))
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goto fail;
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return init_vgmstream_main(streamFile, &ea);
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fail:
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return NULL;
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}
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static VGMSTREAM * init_vgmstream_main(STREAMFILE *streamFile, ea_header* ea) {
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VGMSTREAM * vgmstream = NULL;
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/* build the VGMSTREAM */
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vgmstream = allocate_vgmstream(ea->channels, ea->loop_flag);
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if (!vgmstream) goto fail;
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vgmstream->sample_rate = ea->sample_rate;
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vgmstream->num_samples = ea->num_samples;
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vgmstream->loop_start_sample = ea->loop_start;
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vgmstream->loop_end_sample = ea->loop_end;
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vgmstream->codec_endian = ea->big_endian;
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vgmstream->layout_type = ea->is_bank ? layout_none : layout_blocked_ea_1snh;
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vgmstream->meta_type = ea->is_bank ? meta_EA_EACS : meta_EA_1SNH;
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vgmstream->num_streams = ea->total_subsongs;
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switch (ea->codec) {
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case EA_CODEC_PCM: /* Need for Speed (PC) */
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vgmstream->coding_type = ea->bits==1 ? coding_PCM8_int : coding_PCM16_int;
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break;
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case EA_CODEC_ULAW: /* Crusader: No Remorse movies (SAT), FIFA 96 movies (SAT) */
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if (ea->bits && ea->bits != 2) goto fail; /* only set in EACS */
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vgmstream->coding_type = coding_ULAW_int;
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break;
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case EA_CODEC_IMA: /* Need for Speed II (PC) */
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if (ea->bits && ea->bits != 2) goto fail; /* only in EACS */
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vgmstream->coding_type = coding_DVI_IMA; /* stereo/mono, high nibble first */
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vgmstream->codec_config = ea->codec_config;
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break;
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case EA_CODEC_PSX: /* Need for Speed (PS) */
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vgmstream->coding_type = coding_PSX;
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break;
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default:
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VGM_LOG("EA EACS: unknown codec 0x%02x\n", ea->codec);
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goto fail;
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}
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if (!vgmstream_open_stream(vgmstream,streamFile,ea->data_offset))
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goto fail;
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return vgmstream;
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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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static int parse_header(STREAMFILE* streamFile, ea_header* ea, off_t offset) {
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int32_t (*read_32bit)(off_t,STREAMFILE*) = ea->big_endian ? read_32bitBE : read_32bitLE;
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if (read_32bitBE(offset+0x00, streamFile) == 0x45414353) { /* "EACS" */
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/* EACS subheader (PC, SAT) */
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ea->sample_rate = read_32bit(offset+0x04, streamFile);
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ea->bits = read_8bit(offset+0x08, streamFile);
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ea->channels = read_8bit(offset+0x09, streamFile);
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ea->codec = read_8bit(offset+0x0a, streamFile);
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ea->type = read_8bit(offset+0x0b, streamFile); /* block type? 0=1SNh, -1=bank */
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ea->num_samples = read_32bit(offset+0x0c, streamFile);
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ea->loop_start = read_32bit(offset+0x10, streamFile);
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ea->loop_end = read_32bit(offset+0x14, streamFile) + ea->loop_start; /* loop length */
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ea->data_offset = read_32bit(offset+0x18, streamFile); /* 0 when blocked */
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/* 0x1c: pan/volume/etc? (0x7F)
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* rest may be padding/garbage */
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//VGM_ASSERT(ea->type != 0, "EA EACS: unknown type %i\n", ea->type);
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if (ea->codec == EA_CODEC_IMA)
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ea->codec_config = get_ea_1snh_ima_version(streamFile, 0x00, ea);
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/* EACS banks with empty values exist but will be rejected later */
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}
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else if (ea->is_sead) {
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/* alt subheader (found in some PC videos) */
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ea->sample_rate = read_32bit(offset+0x00, streamFile);
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ea->channels = read_32bit(offset+0x04, streamFile);
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ea->codec = read_32bit(offset+0x08, streamFile);
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if (ea->codec == EA_CODEC_IMA)
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ea->codec_config = get_ea_1snh_ima_version(streamFile, 0x00, ea);
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set_ea_1snh_num_samples(streamFile, 0x00, ea);
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if (ea->loop_start_offset) /* offset found, now find actual start sample */
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set_ea_1snh_num_samples(streamFile, 0x00, ea);
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}
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else {
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/* alt subheader (PS) */
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ea->sample_rate = read_32bit(offset+0x00, streamFile);
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ea->channels = read_8bit(offset+0x18, streamFile);
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ea->codec = EA_CODEC_PSX;
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set_ea_1snh_num_samples(streamFile, 0x00, ea);
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if (ea->loop_start_offset) /* offset found, now find actual start sample */
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set_ea_1snh_num_samples(streamFile, 0x00, ea);
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}
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ea->loop_flag = (ea->loop_end > 0);
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return 1;
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}
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/* get total samples by parsing block headers, needed when EACS isn't present */
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static void set_ea_1snh_num_samples(STREAMFILE* streamFile, off_t start_offset, ea_header* ea) {
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int num_samples = 0, loop_start = 0, loop_end = 0, loop_start_offset = 0;
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off_t block_offset = start_offset;
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size_t block_size, block_header, block_samples;
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int32_t (*read_32bit)(off_t,STREAMFILE*) = ea->big_endian ? read_32bitBE : read_32bitLE;
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size_t file_size = get_streamfile_size(streamFile);
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while (block_offset < file_size) {
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uint32_t id = read_32bitBE(block_offset+0x00,streamFile);
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block_size = read_32bit(block_offset+0x04,streamFile);
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block_header = 0;
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block_samples = 0;
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if (id == 0x31534E68 || id == 0x53454144) { /* "1SNh" "SEAD" audio header */
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int is_sead = (id == 0x53454144);
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int is_eacs = read_32bitBE(block_offset+0x08, streamFile) == 0x45414353;
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block_header = is_eacs ? 0x28 : (is_sead ? 0x14 : 0x2c);
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if (block_header >= block_size) /* sometimes has audio data after header */
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block_header = 0;
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}
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else if (id == 0x31534E64 || id == 0x534E4443) { /* "1SNd" "SNDC" audio data */
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block_header = 0x08;
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}
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else if (id == 0x00000000 || id == 0xFFFFFFFF || id == 0x31534E65) { /* EOF or "1SNe" */
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break;
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}
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else if (id == 0x31534E6C) { /* "1SNl" loop point found */
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loop_start_offset = read_32bit(block_offset+0x08,streamFile);
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loop_end = num_samples;
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}
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if (block_header) {
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switch(ea->codec) {
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case EA_CODEC_PSX:
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block_samples = ps_bytes_to_samples(block_size - block_header, ea->channels);
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break;
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case EA_CODEC_IMA:
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if (ea->codec_config == 1)
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block_samples = read_32bit(block_offset + block_header, streamFile);
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else
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block_samples = ima_bytes_to_samples(block_size - block_header, ea->channels);
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break;
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}
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}
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/* if there is a loop start offset set, this was called again just to find it */
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if (ea->loop_start_offset && ea->loop_start_offset == block_offset) {
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ea->loop_start = num_samples;
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return;
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}
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num_samples += block_samples;
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block_offset += block_size;
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}
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ea->num_samples = num_samples;
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ea->loop_start = loop_start;
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ea->loop_end = loop_end;
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ea->loop_start_offset = loop_start_offset;
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}
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/* find codec version used, with or without ADPCM hist per block */
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static int get_ea_1snh_ima_version(STREAMFILE* streamFile, off_t start_offset, const ea_header* ea) {
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off_t block_offset = start_offset;
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size_t file_size = get_streamfile_size(streamFile);
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int32_t (*read_32bit)(off_t,STREAMFILE*) = ea->big_endian ? read_32bitBE : read_32bitLE;
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while (block_offset < file_size) {
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uint32_t id = read_32bitBE(block_offset+0x00,streamFile);
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size_t block_size = read_32bitLE(block_offset+0x04,streamFile);
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if (block_size > 0x00F00000) /* BE in SAT, but one file may have both BE and LE chunks */
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block_size = read_32bitBE(block_offset+0x04,streamFile);
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if (id == 0x31534E64 || id == 0x534E4443) { /* "1SNd" "SNDC" audio data */
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size_t ima_samples = read_32bit(block_offset + 0x08, streamFile);
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size_t expected_samples = (block_size - 0x08 - 0x04 - 0x08*ea->channels) * 2 / ea->channels;
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if (ima_samples == expected_samples) {
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return 1; /* has ADPCM hist (hopefully) */
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}
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}
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block_offset += block_size;
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}
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return 0; /* no ADPCM hist */
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}
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