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vgmstream/src/meta/ea_1snh.c
NicknineTheEagle 9420470eca EA 1SNh: Tweaked loop handling
2019-11-10 21:03:02 +03:00

355 lines
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#include "meta.h"
#include "../coding/coding.h"
#include "../layout/layout.h"
#define EA_CODEC_PCM 0x00
#define EA_CODEC_ULAW 0x01
#define EA_CODEC_IMA 0x02
#define EA_CODEC_PSX 0xFF //fake value
typedef struct {
int32_t sample_rate;
uint8_t bits;
uint8_t channels;
uint8_t codec;
uint8_t type;
int32_t num_samples;
int32_t loop_start;
int32_t loop_end;
int32_t loop_start_offset;
int32_t data_offset;
int big_endian;
int loop_flag;
int is_sead;
int codec_config;
int is_bank;
int total_subsongs;
} ea_header;
static int parse_header(STREAMFILE* streamFile, ea_header* ea, off_t begin_offset);
static VGMSTREAM * init_vgmstream_main(STREAMFILE *streamFile, ea_header* ea);
static void set_ea_1snh_num_samples(VGMSTREAM *vgmstream, STREAMFILE *streamFile, ea_header *ea, int find_loop);
static int get_ea_1snh_ima_version(STREAMFILE* streamFile, off_t start_offset, const ea_header* ea);
/* EA 1SNh - from early EA games, stream (~1996, ex. Need for Speed) */
VGMSTREAM * init_vgmstream_ea_1snh(STREAMFILE *streamFile) {
ea_header ea = { 0 };
off_t offset, eacs_offset;
VGMSTREAM *vgmstream = NULL;
/* checks */
/* .asf/as4: common,
* .lasf: fake for plugins
* .cnk: some PS1 games
* .sng: fake for plugins (to mimic EA SCHl's common extension)
* .uv/tgq: some SAT games (video only?)
* .tgv: videos
* (extensionless): Need for Speed (SAT) (videos) */
if (!check_extensions(streamFile, "asf,lasf,as4,cnk,sng,uv,tgq,tgv,"))
goto fail;
offset = 0x00;
/* in TGV videos, either TGVk or 1SNh block comes first */
if (read_32bitBE(0x00, streamFile) == 0x5447566B) { /* "TGVk" */
offset = read_32bitBE(0x04, streamFile);
} else if (read_32bitLE(0x00, streamFile) == 0x5447566B) { /* "kVGT" */
offset = read_32bitLE(0x04, streamFile);
}
if (read_32bitBE(offset + 0x00, streamFile) != 0x31534E68 && /* "1SNh" */
read_32bitBE(offset + 0x00, streamFile) != 0x53454144) /* "SEAD" */
goto fail;
/* stream is divided into blocks/chunks: 1SNh=audio header, 1SNd=data xN, 1SNl=loop end, 1SNe=end.
* Video uses various blocks (TGVk/TGVf/MUVf/etc) and sometimes alt audio blocks (SEAD/SNDC/SEND). */
ea.is_sead = read_32bitBE(offset + 0x00, streamFile) == 0x53454144;
eacs_offset = offset + 0x08; /* after 1SNh block id+size */
if (!parse_header(streamFile, &ea, eacs_offset))
goto fail;
vgmstream = init_vgmstream_main(streamFile, &ea);
if (!vgmstream) goto fail;
if (ea.num_samples == 0) {
/* header does not specify number of samples, need to calculate it manually */
/* HACK: we need vgmstream object to use blocked layout so we're doing this calc after creating it */
set_ea_1snh_num_samples(vgmstream, streamFile, &ea, 0);
/* update samples and loop state */
vgmstream->num_samples = ea.num_samples;
vgmstream_force_loop(vgmstream, ea.loop_flag, ea.loop_start, ea.loop_end);
}
return vgmstream;
fail:
return NULL;
}
/* EA EACS - from early EA games, bank (~1996, ex. Need for Speed) */
VGMSTREAM * init_vgmstream_ea_eacs(STREAMFILE *streamFile) {
ea_header ea = {0};
off_t eacs_offset;
/* checks */
/* .eas: single bank [Need for Speed (PC)]
* .bnk: multi bank [Need for Speed (PC)] */
if (!check_extensions(streamFile,"eas,bnk"))
goto fail;
/* plain data without blocks, can contain N*(EACS header) + N*(data), or N (EACS header + data) */
ea.is_bank = 1;
/* use ??? as endian marker (Saturn = BE) */
//ea.big_endian = guess_endianness32bit(0x04,streamFile);
if (read_32bitBE(0x00,streamFile) == 0x45414353) { /* "EACS" */
/* single bank variant */
eacs_offset = 0x00;
}
else if (read_32bitBE(0x00,streamFile) == 0x00) {
/* multi bank variant */
int i;
int target_subsong = streamFile->stream_index;
if (target_subsong == 0) target_subsong = 1;
if (target_subsong < 0) goto fail;
/* offsets to EACSs are scattered in the first 0x200
* this looks dumb but seems like the only way */
eacs_offset = 0;
for (i = 0x00; i < 0x200; i += 0x04) {
off_t bank_offset = read_32bitLE(i, streamFile);
if (bank_offset == 0)
continue;
ea.total_subsongs++;
/* parse mini bank header */
if (ea.total_subsongs == target_subsong) {
/* 0x00: some id or flags? */
eacs_offset = read_32bitLE(bank_offset + 0x04, streamFile);
if (read_32bitBE(eacs_offset, streamFile) != 0x45414353)
goto fail;
/* rest: not sure if part of this header */
}
}
if (eacs_offset == 0)
goto fail;
}
else {
goto fail;
}
if (!parse_header(streamFile,&ea, eacs_offset))
goto fail;
return init_vgmstream_main(streamFile, &ea);
fail:
return NULL;
}
static VGMSTREAM * init_vgmstream_main(STREAMFILE *streamFile, ea_header* ea) {
VGMSTREAM * vgmstream = NULL;
/* build the VGMSTREAM */
vgmstream = allocate_vgmstream(ea->channels, ea->loop_flag);
if (!vgmstream) goto fail;
vgmstream->sample_rate = ea->sample_rate;
vgmstream->num_samples = ea->num_samples;
vgmstream->loop_start_sample = ea->loop_start;
vgmstream->loop_end_sample = ea->loop_end;
vgmstream->codec_endian = ea->big_endian;
vgmstream->layout_type = ea->is_bank ? layout_none : layout_blocked_ea_1snh;
vgmstream->meta_type = ea->is_bank ? meta_EA_EACS : meta_EA_1SNH;
vgmstream->num_streams = ea->total_subsongs;
switch (ea->codec) {
case EA_CODEC_PCM: /* Need for Speed (PC) */
vgmstream->coding_type = ea->bits==1 ? coding_PCM8_int : coding_PCM16_int;
break;
case EA_CODEC_ULAW: /* Crusader: No Remorse movies (SAT), FIFA 96 movies (SAT) */
if (ea->bits && ea->bits != 2) goto fail; /* only set in EACS */
vgmstream->coding_type = coding_ULAW_int;
break;
case EA_CODEC_IMA: /* Need for Speed (PC) */
if (ea->bits && ea->bits != 2) goto fail; /* only in EACS */
vgmstream->coding_type = coding_DVI_IMA; /* stereo/mono, high nibble first */
vgmstream->codec_config = ea->codec_config;
break;
case EA_CODEC_PSX: /* Need for Speed (PS1) */
vgmstream->coding_type = coding_PSX;
break;
default:
VGM_LOG("EA EACS: unknown codec 0x%02x\n", ea->codec);
goto fail;
}
if (!vgmstream_open_stream(vgmstream,streamFile,ea->data_offset))
goto fail;
return vgmstream;
fail:
if (vgmstream) close_vgmstream(vgmstream);
return NULL;
}
static int parse_header(STREAMFILE* streamFile, ea_header* ea, off_t offset) {
/* audio header endianness doesn't always match block headers, use sample rate to detect */
int32_t (*read_32bit)(off_t,STREAMFILE*);
if (read_32bitBE(offset+0x00, streamFile) == 0x45414353) { /* "EACS" */
/* EACS subheader (PC, SAT) */
ea->big_endian = guess_endianness32bit(offset + 0x04, streamFile);
read_32bit = ea->big_endian ? read_32bitBE : read_32bitLE;
ea->sample_rate = read_32bit(offset+0x04, streamFile);
ea->bits = read_8bit(offset+0x08, streamFile);
ea->channels = read_8bit(offset+0x09, streamFile);
ea->codec = read_8bit(offset+0x0a, streamFile);
ea->type = read_8bit(offset+0x0b, streamFile); /* block type? 0=1SNh, -1=bank */
ea->num_samples = read_32bit(offset+0x0c, streamFile);
ea->loop_start = read_32bit(offset+0x10, streamFile);
ea->loop_end = read_32bit(offset+0x14, streamFile) + ea->loop_start; /* loop length */
ea->data_offset = read_32bit(offset+0x18, streamFile); /* 0 when blocked */
/* 0x1c: pan/volume/etc? (0x7F)
* rest may be padding/garbage */
//VGM_ASSERT(ea->type != 0, "EA EACS: unknown type %i\n", ea->type);
if (ea->codec == EA_CODEC_IMA)
ea->codec_config = get_ea_1snh_ima_version(streamFile, 0x00, ea);
/* EACS banks with empty values exist but will be rejected later */
}
else if (read_32bitBE(offset + 0x00, streamFile) == 0x00) {
/* found in early videos, similar to EACS */
ea->big_endian = guess_endianness32bit(offset + 0x04, streamFile);
read_32bit = ea->big_endian ? read_32bitBE : read_32bitLE;
ea->sample_rate = read_32bit(offset + 0x04, streamFile);
ea->bits = read_8bit(offset + 0x08, streamFile);
ea->channels = read_8bit(offset + 0x09, streamFile);
ea->codec = read_8bit(offset + 0x0a, streamFile);
ea->type = read_8bit(offset + 0x0b, streamFile); /* block type? 0=1SNh, -1=bank */
if (ea->codec == EA_CODEC_IMA)
ea->codec_config = get_ea_1snh_ima_version(streamFile, 0x00, ea);
}
else if (ea->is_sead) {
/* alt subheader (found in some PC videos) */
ea->big_endian = guess_endianness32bit(offset + 0x00, streamFile);
read_32bit = ea->big_endian ? read_32bitBE : read_32bitLE;
ea->sample_rate = read_32bit(offset+0x00, streamFile);
ea->channels = read_32bit(offset+0x04, streamFile);
ea->codec = read_32bit(offset+0x08, streamFile);
if (ea->codec == EA_CODEC_IMA)
ea->codec_config = get_ea_1snh_ima_version(streamFile, 0x00, ea);
}
else {
/* alt subheader (PS1) */
ea->big_endian = guess_endianness32bit(offset + 0x00, streamFile);
read_32bit = ea->big_endian ? read_32bitBE : read_32bitLE;
ea->sample_rate = read_32bit(offset+0x00, streamFile);
ea->channels = read_8bit(offset+0x18, streamFile);
ea->codec = EA_CODEC_PSX;
}
ea->loop_flag = (ea->loop_end > 0);
return 1;
}
/* get total samples by parsing block headers, needed when EACS isn't present */
static void set_ea_1snh_num_samples(VGMSTREAM *vgmstream, STREAMFILE *streamFile, ea_header *ea, int find_loop) {
int32_t num_samples = 0, block_id;
size_t file_size;
int32_t(*read_32bit)(off_t, STREAMFILE *) = ea->big_endian ? read_32bitBE : read_32bitLE;
int loop_end_found = 0;
file_size = get_streamfile_size(streamFile);
vgmstream->next_block_offset = ea->data_offset;
while (vgmstream->next_block_offset < file_size) {
block_update_ea_1snh(vgmstream->next_block_offset, vgmstream);
if (vgmstream->current_block_samples < 0)
break;
block_id = read_32bitBE(vgmstream->current_block_offset, streamFile);
if (find_loop) {
if (vgmstream->current_block_offset == ea->loop_start_offset) {
ea->loop_start = num_samples;
ea->loop_flag = 1;
block_update_ea_1snh(ea->data_offset, vgmstream);
return;
}
} else {
if (block_id == 0x31534E6C) { /* "1SNl" loop point found */
ea->loop_start_offset = read_32bit(vgmstream->current_block_offset + 0x08, streamFile);
ea->loop_end = num_samples;
loop_end_found = 1;
}
}
num_samples += vgmstream->current_block_samples;
}
ea->num_samples = num_samples;
/* reset once we're done */
block_update_ea_1snh(ea->data_offset, vgmstream);
if (loop_end_found) {
/* recurse to find loop start sample */
set_ea_1snh_num_samples(vgmstream, streamFile, ea, 1);
}
}
/* find codec version used, with or without ADPCM hist per block */
static int get_ea_1snh_ima_version(STREAMFILE* streamFile, off_t start_offset, const ea_header* ea) {
off_t block_offset = start_offset;
size_t file_size = get_streamfile_size(streamFile);
int32_t (*read_32bit)(off_t,STREAMFILE*) = ea->big_endian ? read_32bitBE : read_32bitLE;
while (block_offset < file_size) {
uint32_t id = read_32bitBE(block_offset+0x00,streamFile);
size_t block_size;
/* BE in SAT, but one file may have both BE and LE chunks */
if (guess_endianness32bit(block_offset + 0x04, streamFile))
block_size = read_32bitBE(block_offset + 0x04, streamFile);
else
block_size = read_32bitLE(block_offset + 0x04, streamFile);
if (id == 0x31534E64 || id == 0x534E4443) { /* "1SNd" "SNDC" audio data */
size_t ima_samples = read_32bit(block_offset + 0x08, streamFile);
size_t expected_samples = (block_size - 0x08 - 0x04 - 0x08*ea->channels) * 2 / ea->channels;
if (ima_samples == expected_samples) {
return 1; /* has ADPCM hist (hopefully) */
}
}
block_offset += block_size;
}
return 0; /* no ADPCM hist */
}
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