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cog/Frameworks/vgmstream/vgmstream/src/coding/ubi_adpcm_decoder.c

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#include "coding.h"
/* Decodes Ubisoft ADPCM, a rather complex codec with 4-bit (usually music) and 6-bit (usually voices/sfx)
* mono or stereo modes, using multiple tables and temp step/delta values.
*
* Base reverse engineering by Zench: https://bitbucket.org/Zenchreal/decubisnd
* Original 4-bit mode ASM MMX/intrinsics to C++ by sigsegv; adapted + 6-bit mode by bnnm; special thanks to Nicknine.
*
* Data always starts with a 0x30 main header (some games have extra data before too), then frames of
* fixed size: 0x34 ADPCM setup per channel, 1 subframe + 1 padding byte, then another subframe and 1 byte.
* Subframes have 1536 samples or less (like 1024), typical sizes are 0x600 for 4-bit or 0x480 for 6-bit.
* Last frame can contain only one subframe, with less codes than normal (may use padding). Nibbles/codes
* are packed as 32-bit LE with 6-bit or 4-bit codes for all channels (processes kinda like joint stereo).
*/
#define UBI_CHANNELS_MIN 1
#define UBI_CHANNELS_MAX 2
#define UBI_SUBFRAMES_PER_FRAME_MAX 2
#define UBI_CODES_PER_SUBFRAME_MAX 1536 /* for all channels */
#define UBI_FRAME_SIZE_MAX (0x34 * UBI_CHANNELS_MAX + (UBI_CODES_PER_SUBFRAME_MAX * 6 / 8 + 0x1) * UBI_SUBFRAMES_PER_FRAME_MAX)
#define UBI_SAMPLES_PER_FRAME_MAX (UBI_CODES_PER_SUBFRAME_MAX * UBI_SUBFRAMES_PER_FRAME_MAX)
typedef struct {
uint32_t signature;
uint32_t sample_count;
uint32_t subframe_count;
uint32_t codes_per_subframe_last;
uint32_t codes_per_subframe;
uint32_t subframes_per_frame;
uint32_t unknown18;
uint32_t unknown1c;
uint32_t unknown20;
uint32_t bits_per_sample;
uint32_t unknown28;
uint32_t channels;
} ubi_adpcm_header_data;
typedef struct {
uint32_t signature;
int32_t step1;
int32_t next1;
int32_t next2;
int16_t coef1;
int16_t coef2;
int16_t unused1;
int16_t unused2;
int16_t mod1;
int16_t mod2;
int16_t mod3;
int16_t mod4;
int16_t hist1;
int16_t hist2;
int16_t unused3;
int16_t unused4;
int16_t delta1;
int16_t delta2;
int16_t delta3;
int16_t delta4;
int16_t delta5;
int16_t unused5;
} ubi_adpcm_channel_data;
struct ubi_adpcm_codec_data {
ubi_adpcm_header_data header;
ubi_adpcm_channel_data ch[UBI_CHANNELS_MAX];
uint32_t start_offset;
uint32_t offset;
int subframe_number;
uint8_t frame[UBI_FRAME_SIZE_MAX];
uint8_t codes[UBI_CODES_PER_SUBFRAME_MAX];
int16_t samples[UBI_SAMPLES_PER_FRAME_MAX]; /* for all channels, saved in L-R-L-R form */
size_t samples_filled;
size_t samples_consumed;
size_t samples_to_discard;
};
/* *********************************************************************** */
static int parse_header(STREAMFILE* sf, ubi_adpcm_codec_data* data, uint32_t offset, uint32_t size);
static void decode_frame(STREAMFILE* sf, ubi_adpcm_codec_data* data);
static void fix_samples(ubi_adpcm_codec_data* data, uint32_t size);
ubi_adpcm_codec_data* init_ubi_adpcm(STREAMFILE* sf, uint32_t offset, uint32_t size, int channels) {
ubi_adpcm_codec_data* data = NULL;
data = calloc(1, sizeof(ubi_adpcm_codec_data));
if (!data) goto fail;
if (!parse_header(sf, data, offset, size)) {
VGM_LOG("UBI ADPCM: wrong header\n");
goto fail;
}
if (data->header.channels != channels) {
VGM_LOG("UBI ADPCM: wrong number of channels: %i vs %i\n", data->header.channels, channels);
goto fail;
}
data->start_offset = offset + 0x30;
data->offset = data->start_offset;
return data;
fail:
free_ubi_adpcm(data);
return NULL;
}
void decode_ubi_adpcm(VGMSTREAM* vgmstream, sample_t* outbuf, int32_t samples_to_do) {
STREAMFILE* sf = vgmstream->ch[0].streamfile;
ubi_adpcm_codec_data* data = vgmstream->codec_data;
uint32_t channels = data->header.channels;
int samples_done = 0;
/* Ubi ADPCM frames are rather big, so we decode then copy to outbuf until done */
while (samples_done < samples_to_do) {
if (data->samples_filled) {
int samples_to_get = data->samples_filled;
if (data->samples_to_discard) {
/* discard samples for looping */
if (samples_to_get > data->samples_to_discard)
samples_to_get = data->samples_to_discard;
data->samples_to_discard -= samples_to_get;
}
else {
/* get max samples and copy */
if (samples_to_get > samples_to_do - samples_done)
samples_to_get = samples_to_do - samples_done;
memcpy(outbuf + samples_done*channels,
data->samples + data->samples_consumed*channels,
samples_to_get*channels * sizeof(sample));
samples_done += samples_to_get;
}
/* mark consumed samples */
data->samples_consumed += samples_to_get;
data->samples_filled -= samples_to_get;
}
else {
decode_frame(sf, data);
}
}
}
void reset_ubi_adpcm(ubi_adpcm_codec_data* data) {
if (!data) return;
data->offset = data->start_offset;
data->subframe_number = 0;
}
void seek_ubi_adpcm(ubi_adpcm_codec_data* data, int32_t num_sample) {
if (!data) return;
//todo improve by seeking to closest frame
reset_ubi_adpcm(data);
data->samples_to_discard = num_sample;
}
void free_ubi_adpcm(ubi_adpcm_codec_data *data) {
if (!data)
return;
free(data);
}
/* ************************************************************************ */
static void read_header_state(uint8_t* data, ubi_adpcm_header_data* header) {
header->signature = get_u32le(data + 0x00);
header->sample_count = get_u32le(data + 0x04);
header->subframe_count = get_u32le(data + 0x08);
header->codes_per_subframe_last= get_u32le(data + 0x0c);
header->codes_per_subframe = get_u32le(data + 0x10);
header->subframes_per_frame = get_u32le(data + 0x14);
header->unknown18 = get_u32le(data + 0x18); /* sometimes sample rate but algo other values (garbage?) */
header->unknown1c = get_u32le(data + 0x1c); /* variable */
header->unknown20 = get_u32le(data + 0x20); /* null? */
header->bits_per_sample = get_u32le(data + 0x24);
header->unknown28 = get_u32le(data + 0x28); /* 1~3? */
header->channels = get_u32le(data + 0x2c);
}
static int parse_header(STREAMFILE* sf, ubi_adpcm_codec_data* data, uint32_t offset, uint32_t size) {
uint8_t buf[0x30];
size_t bytes;
bytes = read_streamfile(buf, offset, 0x30, sf);
if (bytes != 0x30) goto fail;
read_header_state(buf, &data->header);
if (data->header.signature != 0x08)
goto fail;
if (data->header.codes_per_subframe_last > UBI_CODES_PER_SUBFRAME_MAX ||
data->header.codes_per_subframe > UBI_CODES_PER_SUBFRAME_MAX)
goto fail;
if (data->header.subframes_per_frame != UBI_SUBFRAMES_PER_FRAME_MAX)
goto fail;
if (data->header.bits_per_sample != 4 && data->header.bits_per_sample != 6)
goto fail;
if (data->header.channels > UBI_CHANNELS_MAX || data->header.channels < UBI_CHANNELS_MIN)
goto fail;
/* some kind of internal bug I guess, seen in a few subsongs in Rayman 3 PC demo */
if (data->header.sample_count == 0x77E7A374 * data->header.channels) {
fix_samples(data, size);
}
return 1;
fail:
return 0;
}
/* *********************************************************************** */
static const int32_t adpcm6_table1[64] = {
-100000000, -369, -245, -133, -33, 56, 135, 207,
275, 338, 395, 448, 499, 548, 593, 635,
676, 717, 755, 791, 825, 858, 889, 919,
948, 975, 1003, 1029, 1054, 1078, 1103, 1132,
/* probably unused (partly spilled from next table) */
1800, 1800, 1800, 2048, 3072, 4096, 5000, 5056,
5184, 5240, 6144, 6880, 9624, 12880, 14952, 18040,
20480, 22920, 25600, 28040, 32560, 35840, 40960, 45832,
51200, 56320, 63488, 67704, 75776, 89088, 102400, 0,
};
static const int32_t adpcm6_table2[64] = {
1800, 1800, 1800, 2048, 3072, 4096, 5000, 5056,
5184, 5240, 6144, 6880, 9624, 12880, 14952, 18040,
20480, 22920, 25600, 28040, 32560, 35840, 40960, 45832,
51200, 56320, 63488, 67704, 75776, 89088, 102400, 0,
/* probably unused */
0, 0, 0, 0, 0, 0, 0, 0,
0, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 2, 2, 3, 3, 4,
4, 5, 5, 5, 6, 6, 6, 7,
};
static const int32_t adpcm4_table1[16] = {
-100000000, 8, 269, 425, 545, 645, 745, 850,
/* probably unused */
-1082465976, 1058977874, 1068540887, 1072986849, 1075167887, 1076761723, 1078439444, 1203982336,
};
static const int32_t adpcm4_table2[16] = {
-1536, 2314, 5243, 8192, 14336, 25354, 45445, 143626,
/* probably unused */
0, 0, 0, 1, 1, 1, 3, 7,
};
static const int32_t delta_table[33+33] = {
1024, 1031, 1053, 1076, 1099, 1123, 1148, 1172,
1198, 1224, 1251, 1278, 1306, 1334, 1363, 1393,
1423, 1454, 1485, 1518, 1551, 1584, 1619, 1654,
1690, 1726, 1764, 1802, 1841, 1881, 1922, 1964,
2007,
-1024,-1031,-1053,-1076,-1099,-1123,-1148,-1172,
-1198,-1224,-1251,-1278,-1306,-1334,-1363,-1393,
-1423,-1454,-1485,-1518,-1551,-1584,-1619,-1654,
-1690,-1726,-1764,-1802,-1841,-1881,-1922,-1964,
-2007
};
static int sign16(int16_t test) {
return (test < 0 ? -1 : 1);
}
static int sign32(int32_t test) {
return (test < 0 ? -1 : 1);
}
static int16_t absmax16(int16_t val, int16_t absmax) {
if (val < 0) {
if (val < -absmax) return -absmax;
} else {
if (val > absmax) return absmax;
}
return val;
}
static int32_t clamp_val(int32_t val, int32_t min, int32_t max) {
if (val < min) return min;
else if (val > max) return max;
else return val;
}
static int16_t expand_code_6bit(uint8_t code, ubi_adpcm_channel_data* state) {
int step0_index;
int32_t code_signed, step0_next, step0, delta0;
int32_t sample_new;
code_signed = (int32_t)code - 31; /* convert coded 0..63 value to signed value, where 0=-31 .. 31=0 .. 63=32 */
step0_index = abs(code_signed); /* 0..32, but should only go up to 31 */
step0_next = adpcm6_table1[step0_index] + state->step1;
step0 = (state->step1 & 0xFFFF) * 246;
step0 = (step0 + adpcm6_table2[step0_index]) >> 8;
step0 = clamp_val(step0, 271, 2560);
delta0 = 0;
if (!(((step0_next & 0xFFFFFF00) - 1) & (1 << 31))) {
int delta0_index = ((step0_next >> 3) & 0x1F) + (code_signed < 0 ? 33 : 0);
int delta0_shift = clamp_val((step0_next >> 8) & 0xFF, 0,31);
delta0 = (delta_table[delta0_index] << delta0_shift) >> 10;
}
sample_new = (int16_t)(delta0 + state->delta1 + state->hist1);
state->hist1 = sample_new;
state->step1 = step0;
state->delta1 = delta0;
VGM_ASSERT(step0_index > 31, "UBI ADPCM: index over 31\n");
return sample_new;
}
/* may be simplified (masks, saturation, etc) as some values should never happen in the encoder */
static int16_t expand_code_4bit(uint8_t code, ubi_adpcm_channel_data* state) {
int step0_index;
int32_t code_signed, step0_next, step0, delta0, next0, coef1_next, coef2_next;
int32_t sample_new;
code_signed = (int32_t)code - 7; /* convert coded 0..15 value to signed value, where 0=-7 .. 7=0 .. 15=8 */
step0_index = abs(code_signed); /* 0..8, but should only go up to 7 */
step0_next = adpcm4_table1[step0_index] + state->step1;
step0 = (state->step1 & 0xFFFF) * 246;
step0 = (step0 + adpcm4_table2[step0_index]) >> 8;
step0 = clamp_val(step0, 271, 2560);
delta0 = 0;
if (!(((step0_next & 0xFFFFFF00) - 1) & (1 << 31))) {
int delta0_index = ((step0_next >> 3) & 0x1F) + (code_signed < 0 ? 33 : 0);
int delta0_shift = clamp_val((step0_next >> 8) & 0xFF, 0,31);
delta0 = (delta_table[delta0_index] << delta0_shift) >> 10;
}
next0 = (int16_t)((
(state->mod1 * state->delta1) + (state->mod2 * state->delta2) +
(state->mod3 * state->delta3) + (state->mod4 * state->delta4) ) >> 10);
sample_new = ((state->coef1 * state->hist1) + (state->coef2 * state->hist2)) >> 10;
sample_new = (int16_t)(delta0 + next0 + sample_new);
coef1_next = state->coef1 * 255;
coef2_next = state->coef2 * 254;
delta0 = (int16_t)delta0;
if (delta0 + next0 != 0) {
int32_t sign1, sign2, coef_delta;
sign1 = sign32(delta0 + next0) * sign32(state->delta1 + state->next1);
sign2 = sign32(delta0 + next0) * sign32(state->delta2 + state->next2);
coef_delta = (int16_t)((((sign1 * 3072) + coef1_next) >> 6) & ~0x3);
coef_delta = clamp16(clamp16(coef_delta + 30719) - 30719); //???
coef_delta = clamp16(clamp16(coef_delta + -30720) - -30720); //???
coef_delta = ((int16_t)(sign2 * 1024) - (int16_t)(sign1 * coef_delta)) * 2;
coef1_next += sign1 * 3072;
coef2_next += coef_delta;
}
state->hist2 = state->hist1;
state->hist1 = sample_new;
state->coef2 = absmax16((int16_t)(coef2_next >> 8), 768);
state->coef1 = absmax16((int16_t)(coef1_next >> 8), 960 - state->coef2);
state->next2 = state->next1;
state->next1 = next0;
state->step1 = step0;
state->delta5 = state->delta4;
state->delta4 = state->delta3;
state->delta3 = state->delta2;
state->delta2 = state->delta1;
state->delta1 = delta0;
state->mod4 = clamp16(state->mod4 * 255 + 2048 * sign16(state->delta1) * sign16(state->delta5)) >> 8;
state->mod3 = clamp16(state->mod3 * 255 + 2048 * sign16(state->delta1) * sign16(state->delta4)) >> 8;
state->mod2 = clamp16(state->mod2 * 255 + 2048 * sign16(state->delta1) * sign16(state->delta3)) >> 8;
state->mod1 = clamp16(state->mod1 * 255 + 2048 * sign16(state->delta1) * sign16(state->delta2)) >> 8;
VGM_ASSERT(step0_index > 7, "UBI ADPCM: index over 7\n");
return sample_new;
}
static void decode_subframe_mono(ubi_adpcm_channel_data* ch_state, uint8_t* codes, int16_t* samples, int code_count, int bps) {
int i;
int16_t (*expand_code)(uint8_t,ubi_adpcm_channel_data*) = NULL;
if (bps == 6)
expand_code = expand_code_6bit;
else
expand_code = expand_code_4bit;
for (i = 0; i < code_count; i++) {
samples[i] = expand_code(codes[i], ch_state);
}
}
static void decode_subframe_stereo(ubi_adpcm_channel_data* ch0_state, ubi_adpcm_channel_data* ch1_state, uint8_t* codes, int16_t* samples, int code_count, int bps) {
int i;
int16_t (*expand_code)(uint8_t,ubi_adpcm_channel_data*) = NULL;
if (bps == 6)
expand_code = expand_code_6bit;
else
expand_code = expand_code_4bit;
for (i = 0; i < code_count; i += 8) {
samples[i + 0] = expand_code(codes[i + 0], ch0_state);
samples[i + 1] = expand_code(codes[i + 2], ch0_state);
samples[i + 2] = expand_code(codes[i + 4], ch0_state);
samples[i + 3] = expand_code(codes[i + 6], ch0_state);
samples[i + 4] = expand_code(codes[i + 1], ch1_state);
samples[i + 5] = expand_code(codes[i + 3], ch1_state);
samples[i + 6] = expand_code(codes[i + 5], ch1_state);
samples[i + 7] = expand_code(codes[i + 7], ch1_state);
}
for (i = 0; i < code_count; i += 8) {
int16_t samples_old[8];
memcpy(samples_old, samples, sizeof(samples_old));
samples[0] = clamp16(samples_old[0] + samples_old[4]);
samples[1] = clamp16(samples_old[0] - samples_old[4]);
samples[2] = clamp16(samples_old[1] + samples_old[5]);
samples[3] = clamp16(samples_old[1] - samples_old[5]);
samples[4] = clamp16(samples_old[2] + samples_old[6]);
samples[5] = clamp16(samples_old[2] - samples_old[6]);
samples[6] = clamp16(samples_old[3] + samples_old[7]);
samples[7] = clamp16(samples_old[3] - samples_old[7]);
samples += 8;
}
}
/* unpack uint32 LE data into 4/6-bit codes:
* - for 4-bit, 32b contain 8 codes
* ex. uint8_t 0x98576787DB5725A8... becomes 0x87675798 LE = 8 7 6 7 5 7 9 8 ...
* - for 6-bit, 32b contain ~5 codes with leftover bits used in following 32b
* ex. uint8_t 0x98576787DB5725A8... becomes 0x87675798 LE = 100001 110110 011101 010111 100110 00,
* 0xA82557DB LE = 1010 100000 100101 010101 111101 1011 ... (where last 00 | first 1010 = 001010), etc
* Codes aren't signed but rather have a particular meaning (see decoding).
*/
static void unpack_codes(uint8_t* data, uint8_t* codes, int code_count, int bps) {
int i;
size_t pos = 0;
uint64_t bits = 0, input = 0;
const uint64_t mask = (bps == 6) ? 0x3f : 0x0f;
for (i = 0; i < code_count; i++) {
if (bits < bps) {
uint32_t source32le = get_u32le(data + pos);
pos += 0x04;
input = (input << 32) | (uint64_t)source32le;
bits += 32;
}
bits -= bps;
codes[i] = (uint8_t)((input >> bits) & mask);
}
}
static void read_channel_state(uint8_t* data, ubi_adpcm_channel_data* ch) {
/* ADPCM frame state, some fields are unused and contain repeated garbage in all frames but
* probably exist for padding (original code uses MMX to operate in multiple 16b at the same time)
* or reserved for other bit modes */
ch->signature = get_u32le(data + 0x00);
ch->step1 = get_s32le(data + 0x04);
ch->next1 = get_s32le(data + 0x08);
ch->next2 = get_s32le(data + 0x0c);
ch->coef1 = get_s16le(data + 0x10);
ch->coef2 = get_s16le(data + 0x12);
ch->unused1 = get_s16le(data + 0x14);
ch->unused2 = get_s16le(data + 0x16);
ch->mod1 = get_s16le(data + 0x18);
ch->mod2 = get_s16le(data + 0x1a);
ch->mod3 = get_s16le(data + 0x1c);
ch->mod4 = get_s16le(data + 0x1e);
ch->hist1 = get_s16le(data + 0x20);
ch->hist2 = get_s16le(data + 0x22);
ch->unused3 = get_s16le(data + 0x24);
ch->unused4 = get_s16le(data + 0x26);
ch->delta1 = get_s16le(data + 0x28);
ch->delta2 = get_s16le(data + 0x2a);
ch->delta3 = get_s16le(data + 0x2c);
ch->delta4 = get_s16le(data + 0x2e);
ch->delta5 = get_s16le(data + 0x30);
ch->unused5 = get_s16le(data + 0x32);
VGM_ASSERT(ch->signature != 0x02, "UBI ADPCM: incorrect channel header\n");
VGM_ASSERT(ch->unused3 != 0x00, "UBI ADPCM: found unused3 used\n");
VGM_ASSERT(ch->unused4 != 0x00, "UBI ADPCM: found unused4 used\n");
}
static void decode_frame(STREAMFILE* sf, ubi_adpcm_codec_data* data) {
int code_count_a, code_count_b;
size_t subframe_size_a, subframe_size_b, frame_size, bytes;
int bps = data->header.bits_per_sample;
int channels = data->header.channels;
/* last frame is shorter (subframe A or B may not exist), avoid over-reads in bigfiles */
if (data->subframe_number + 1 == data->header.subframe_count) {
code_count_a = data->header.codes_per_subframe_last;
code_count_b = 0;
} else if (data->subframe_number + 2 == data->header.subframe_count) {
code_count_a = data->header.codes_per_subframe;
code_count_b = data->header.codes_per_subframe_last;
} else {
code_count_a = data->header.codes_per_subframe;
code_count_b = data->header.codes_per_subframe;
}
subframe_size_a = (bps * code_count_a / 8);
if (subframe_size_a) subframe_size_a += 0x01;
subframe_size_b = (bps * code_count_b / 8);
if (subframe_size_b) subframe_size_b += 0x01;
frame_size = 0x34 * channels + subframe_size_a + subframe_size_b;
//todo check later games (ex. Myst IV) if they handle this
/* last frame can have an odd number of codes, with data ending not aligned to 32b,
* but RE'd code unpacking and stereo decoding always assume to be aligned, causing clicks in some cases
* (if data ends in 0xEE it'll try to do 0x000000EE, but only unpack codes 0 0, thus ignoring actual last 2) */
//memset(data->frame, 0, sizeof(data->frame));
//memset(data->codes, 0, sizeof(data->codes));
//memset(data->samples, 0, sizeof(data->samples));
bytes = read_streamfile(data->frame, data->offset, frame_size, sf);
if (bytes != frame_size) {
VGM_LOG("UBI ADPCM: wrong bytes read %x vs %x at %x\n", bytes, frame_size, data->offset);
//goto fail; //may reach EOF earlier
}
if (channels == 1) {
read_channel_state(data->frame + 0x00, &data->ch[0]);
unpack_codes(data->frame + 0x34, data->codes, code_count_a, bps);
decode_subframe_mono(&data->ch[0], data->codes, &data->samples[0], code_count_a, bps);
unpack_codes(data->frame + 0x34 + subframe_size_a, data->codes, code_count_b, bps);
decode_subframe_mono(&data->ch[0], data->codes, &data->samples[code_count_a], code_count_b, bps);
}
else if (channels == 2) {
read_channel_state(data->frame + 0x00, &data->ch[0]);
read_channel_state(data->frame + 0x34, &data->ch[1]);
unpack_codes(data->frame + 0x68, data->codes, code_count_a, bps);
decode_subframe_stereo(&data->ch[0], &data->ch[1], data->codes, &data->samples[0], code_count_a, bps);
unpack_codes(data->frame + 0x68 + subframe_size_a, data->codes, code_count_b, bps);
decode_subframe_stereo(&data->ch[0], &data->ch[1], data->codes, &data->samples[code_count_a], code_count_b, bps);
}
/* frame done */
data->offset += frame_size;
data->subframe_number += 2;
data->samples_consumed = 0;
data->samples_filled = (code_count_a + code_count_b) / channels;
}
int32_t ubi_adpcm_get_samples(ubi_adpcm_codec_data* data) {
if (!data)
return 0;
return data->header.sample_count / data->header.channels;
}
static void fix_samples(ubi_adpcm_codec_data* data, uint32_t size) {
uint32_t frame_size, setup_size, subframe_size, base_frames, last_size;
int subframes;
int32_t samples;
if (!data || !data->header.channels || !data->header.subframes_per_frame || !size)
return;
size -= 0x30; /* ignore header */
setup_size = 0x34 * data->header.channels; /* setup per channel */
subframe_size = (data->header.codes_per_subframe * data->header.bits_per_sample /*+ 8*/) / 8 + 0x01; /* padding byte */
frame_size = setup_size + subframe_size * data->header.subframes_per_frame;
/* don't trust subframe count */
base_frames = ((size - 0x01) / frame_size); /* force smaller size just in case so last frame isn't used */
last_size = size - (base_frames * frame_size);
subframes = base_frames * data->header.subframes_per_frame;
samples = base_frames * (data->header.codes_per_subframe * data->header.subframes_per_frame);
/* last subframe is shorter (and may contain padding after codes_per_subframe_last), and last frame may not contain all subframes */
if (last_size > setup_size + subframe_size) {
samples += data->header.codes_per_subframe * (data->header.subframes_per_frame - 1);
subframes += (data->header.subframes_per_frame - 1);
}
/* for some reason several files that need fixing seem to have garbage in the 2nd half of last codes */
samples += data->header.codes_per_subframe_last / 2;
subframes += 1;
data->header.sample_count = samples; /* for all channels */
data->header.subframe_count = subframes;
}
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