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extra-dependencies/debian/transcode/transcode-1.1.7/import/import_vag.c

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/*
* import_vag.c -- module for importing PlayStation VAG audio data
* Written by Andrew Church <achurch@achurch.org>
*
* This file is part of transcode, a video stream processing tool.
* transcode is free software, distributable under the terms of the GNU
* General Public License (version 2 or later). See the file COPYING
* for details.
*/
#define MOD_NAME "import_vag.so"
#define MOD_VERSION "v1.0.0 (2006-04-18)"
#define MOD_CAP "Imports PlayStation VAG-format audio"
#define MOD_AUTHOR "Andrew Church"
/*%*
*%* DESCRIPTION
*%* This module decodes VAG-format audio (from PlayStation).
*%*
*%* #BUILD-DEPENDS
*%*
*%* #DEPENDS
*%*
*%* PROCESSING
*%* import/demuxer
*%*
*%* MEDIA
*%* audio
*%*
*%* #INPUT
*%*
*%* OUTPUT
*%* PCM
*%*
*%* OPTION
*%* blocksize (integer)
*%* stereo blocking size.
*%*/
#define MOD_FEATURES \
TC_MODULE_FEATURE_DECODE|TC_MODULE_FEATURE_AUDIO
#define MOD_FLAGS \
TC_MODULE_FLAG_RECONFIGURABLE
#include "transcode.h"
#include "libtc/libtc.h"
#include "libtc/optstr.h"
#include "libtc/tcmodule-plugin.h"
/* For UNLIKELY() (FIXME: this should be defined somewhere useful) */
#include "aclib/ac_internal.h"
/* Maximum stereo block size we allow */
#define MAX_STEREO_BLOCK 0x1000
/* Default stereo block size */
#define DEF_STEREO_BLOCK 0x1000
/* Private data used by this module. */
typedef struct {
int blocksize; /* Stereo block size */
uint8_t databuf[MAX_STEREO_BLOCK]; /* For accumulating data */
int datalen;
int datapos;
int nclip; /* Number of sampled clipped */
int prevsamp[2][2]; /* prevsamp[ch][0] is the immediately previous sample;
* prevsamp[ch][1] is the sample before that */
int totalread; /* For statistics */
} PrivateData;
/* Local routine declarations. */
static int vag_decode(TCModuleInstance *self,
aframe_list_t *inframe, aframe_list_t *outframe);
static void do_decode(const uint8_t *inbuf, int16_t *outbuf, int chan,
PrivateData *pd);
/*************************************************************************/
/*************************************************************************/
/* Module interface routines and data. */
/*************************************************************************/
/**
* vag_init: Initialize this instance of the module. See tcmodule-data.h
* for function details.
*/
static int vag_init(TCModuleInstance *self, uint32_t features)
{
PrivateData *pd = NULL;
TC_MODULE_SELF_CHECK(self, "init");
TC_MODULE_INIT_CHECK(self, MOD_FEATURES, features);
pd = tc_zalloc(sizeof(PrivateData));
if (!pd) {
tc_log_error(MOD_NAME, "init: out of memory!");
return TC_ERROR;
}
pd->blocksize = DEF_STEREO_BLOCK;
self->userdata = pd;
if (verbose) {
tc_log_info(MOD_NAME, "%s %s", MOD_VERSION, MOD_CAP);
}
return TC_OK;
}
/*************************************************************************/
/**
* vag_fini: Clean up after this instance of the module. See
* tcmodule-data.h for function details.
*/
static int vag_fini(TCModuleInstance *self)
{
TC_MODULE_SELF_CHECK(self, "fini");
tc_free(self->userdata);
self->userdata = NULL;
return TC_OK;
}
/*************************************************************************/
/**
* vag_configure: Configure this instance of the module. See
* tcmodule-data.h for function details.
*/
static int vag_configure(TCModuleInstance *self,
const char *options, vob_t *vob)
{
TC_MODULE_SELF_CHECK(self, "configure");
return TC_OK;
}
/*************************************************************************/
/**
* vag_stop: Reset this instance of the module. See tcmodule-data.h for
* function details.
*/
static int vag_stop(TCModuleInstance *self)
{
PrivateData *pd = NULL;
TC_MODULE_SELF_CHECK(self, "stop");
pd = self->userdata;
if (verbose & TC_DEBUG)
tc_log_info(MOD_NAME, "%d bytes processed", pd->totalread);
if (pd->nclip > 0)
tc_log_info(MOD_NAME, "%d samples clipped", pd->nclip);
pd->datalen = 0;
pd->datapos = 0;
pd->nclip = 0;
pd->prevsamp[0][0] = 0;
pd->prevsamp[0][1] = 0;
pd->prevsamp[1][0] = 0;
pd->prevsamp[1][1] = 0;
pd->totalread = 0;
return TC_OK;
}
/*************************************************************************/
/**
* vag_inspect: Return the value of an option in this instance of the
* module. See tcmodule-data.h for function details.
*/
static int vag_inspect(TCModuleInstance *self,
const char *param, const char **value)
{
PrivateData *pd = NULL;
static char buf[TC_BUF_MAX];
TC_MODULE_SELF_CHECK(self, "inspect");
TC_MODULE_SELF_CHECK(param, "inspect");
TC_MODULE_SELF_CHECK(value, "inspect");
pd = self->userdata;
if (optstr_lookup(param, "help")) {
tc_snprintf(buf, sizeof(buf),
"Overview:\n"
" Decodes PlayStation VAG format (ADPCM-style) audio.\n"
"Options available:\n"
" blocksize=N Set stereo blocking size (16-%d, default %d)\n",
MAX_STEREO_BLOCK, DEF_STEREO_BLOCK);
*value = buf;
return TC_IMPORT_OK;
}
if (optstr_lookup(param, "blocksize")) {
tc_snprintf(buf, sizeof(buf), "%d", pd->blocksize);
*value = buf;
return TC_IMPORT_OK;
}
return TC_IMPORT_OK;
}
/*************************************************************************/
static const TCCodecID vag_codecs_in[] = { TC_CODEC_VAG, TC_CODEC_ERROR };
static const TCCodecID vag_codecs_out[] = { TC_CODEC_PCM, TC_CODEC_ERROR };
static const TCFormatID vag_formats_in[] = { TC_FORMAT_ERROR };
static const TCFormatID vag_formats_out[] = { TC_FORMAT_ERROR };
static const TCModuleInfo vag_info = {
.features = MOD_FEATURES,
.flags = MOD_FLAGS,
.name = MOD_NAME,
.version = MOD_VERSION,
.description = MOD_CAP,
.codecs_in = vag_codecs_in,
.codecs_out = vag_codecs_out,
.formats_in = vag_formats_in,
.formats_out = vag_formats_out
};
static const TCModuleClass vag_class = {
TC_MODULE_CLASS_HEAD(vag),
.init = vag_init,
.fini = vag_fini,
.configure = vag_configure,
.stop = vag_stop,
.inspect = vag_inspect,
.decode_audio = vag_decode,
};
TC_MODULE_ENTRY_POINT(vag)
/*************************************************************************/
/*************************************************************************/
/**
* vag_decode: Decode a frame of data. See tcmodule-data.h for function
* details.
*/
static int vag_decode(TCModuleInstance *self,
aframe_list_t *inframe, aframe_list_t *outframe)
{
PrivateData *pd;
uint8_t *inptr;
int insize;
int16_t *outptr;
TC_MODULE_SELF_CHECK(self, "decode");
TC_MODULE_SELF_CHECK(inframe, "decode");
TC_MODULE_SELF_CHECK(outframe, "decode");
pd = self->userdata;
inptr = inframe->audio_buf;
insize = inframe->audio_size;
outptr = (int16_t *)outframe->audio_buf;
outframe->audio_size = 0;
/* Fill out any accumulated data block first */
if (pd->datalen > 0) {
int needed = 16 - pd->datalen;
if (insize < needed) {
/* Not enough for a 16-byte block--copy and exit */
memcpy(pd->databuf + pd->datalen, inframe->audio_buf, insize);
pd->datalen += insize;
return TC_OK;
} else {
/* Finish off the partial block */
memcpy(pd->databuf + pd->datalen, inframe->audio_buf, needed);
insize -= needed;
do_decode(pd->databuf, outptr, 0, pd);
outptr += 28;
pd->datalen = 0;
}
}
/* Loop through all complete data blocks in the input */
while (insize >= 16) {
do_decode(inptr, outptr, 0, pd);
inptr += 16;
insize -= 16;
outptr += 28;
}
/* Save any remaining data in the accumulation buffer */
if (insize > 0) {
memcpy(pd->databuf, inptr, insize);
pd->datalen = insize;
}
return TC_OK;
}
/*************************************************************************/
/**
* do_decode: Decode a single block of 16 bytes into 28 samples.
*
* Parameters:
* inbuf: Pointer to 16 input bytes.
* outbuf: Pointer to buffer of 56 bytes (28 samples).
* chan: Channel selector (0 or 1); controls which previous-sample
* data is used.
* pd: Pointer to module instance's PrivateData structure.
* Return value:
* None.
* Preconditions:
* inbuf != NULL
* outbuf != NULL
* chan == 0 || chan == 1
* pd != NULL
*/
static void do_decode(const uint8_t *inbuf, int16_t *outbuf, int chan,
PrivateData *pd)
{
static const int predict[16][2] = {
{ 0, 0},
{ 60, 0},
{115, 52},
{ 98, 55},
{122, 60},
{ 0, 0},
{ 0, 60},
};
int type = inbuf[0] >> 4;
int scale = 16 - (inbuf[0] & 0x0F);
int prev0 = pd->prevsamp[chan][0]; /* Pull into variables for speed */
int prev1 = pd->prevsamp[chan][1];
int i;
for (i = 0; i < 28; i++) {
int val;
if (i%2 == 0)
val = inbuf[2+i/2] & 0x0F;
else
val = inbuf[2+i/2] >> 4;
if (val >= 8)
val -= 16;
val <<= scale;
val = (prev0*predict[type][0] - prev1*predict[type][1] + (val<<2)) >>6;
if (UNLIKELY(val > 0x7FFF)) {
if (verbose & TC_DEBUG) {
tc_log_warn(MOD_NAME, "clipping to +max: prev1=%c%04X prev0="
"%c%04X val=+%04X (type/scale/in=%X/%X/%X)",
prev1>=0 ? '+' : '-', prev1 & 0xFFFF,
prev0>=0 ? '+' : '-', prev0 & 0xFFFF,
val & 0xFFFF, type, 16-scale,
i%2==0 ? inbuf[2+i/2]&0x0F : inbuf[2+i/2]>>4);
}
val = 0x7FFF;
}
if (UNLIKELY(val < -0x8000)) {
if (verbose & TC_DEBUG) {
tc_log_warn(MOD_NAME, "clipping to -min: prev1=%c%04X prev0="
"%c%04X val=-%04X (type/scale/in=%X/%X/%X)",
prev1>=0 ? '+' : '-', prev1 & 0xFFFF,
prev0>=0 ? '+' : '-', prev0 & 0xFFFF,
val & 0xFFFF, type, 16-scale,
i%2==0 ? inbuf[2+i/2]&0x0F : inbuf[2+i/2]>>4);
}
val = -0x8000;
}
outbuf[i] = val;
prev1 = prev0;
prev0 = val;
}
/* Update private data */
pd->prevsamp[chan][0] = prev0;
pd->prevsamp[chan][1] = prev1;
pd->totalread += 16;
}
/*************************************************************************/
/*************************************************************************/
/* Old-fashioned module stuff */
static PrivateData static_pd;
static FILE *file;
static int16_t saved_samples[56];
static int saved_samples_count;
static int mpeg_mode; // extracting from program stream?
static int mpeg_packet_left; // for xread()
static int mpeg_check_for_header;
static int mpeg_stop;
static int verbose_flag;
static int capability_flag = TC_CAP_PCM;
#define MOD_PRE vagOLD
#define MOD_CODEC "(audio) PS-VAG"
#include "import_def.h"
#include "magic.h"
/*************************************************************************/
MOD_open
{
uint8_t buf[16];
if (param->flag != TC_AUDIO)
return TC_ERROR;
if (vob->a_chan != 1 && vob->a_chan != 2) {
tc_log_error(MOD_NAME, "%d channels not supported (must be 1 or 2)",
vob->a_chan);
return TC_ERROR;
}
if (vob->a_bits != 16) {
tc_log_error(MOD_NAME, "%d bits not supported (must be 16)",
vob->a_bits);
return TC_ERROR;
}
memset(&static_pd, 0, sizeof(static_pd));
if (vob->im_a_string
&& sscanf(vob->im_a_string, "blocksize=%d", &static_pd.blocksize) == 1
) {
if (static_pd.blocksize<16 || static_pd.blocksize>MAX_STEREO_BLOCK) {
tc_log_error(MOD_NAME, "Block size %d out of range (16...%d)",
static_pd.blocksize, MAX_STEREO_BLOCK);
return TC_ERROR;
} else if (static_pd.blocksize & 15) {
tc_log_error(MOD_NAME, "Block size %d not a multiple of 16",
static_pd.blocksize);
return TC_ERROR;
}
} else {
static_pd.blocksize = DEF_STEREO_BLOCK;
}
saved_samples_count = 0;
param->fd = NULL; /* we handle the reading ourselves */
file = fopen(vob->audio_in_file, "r");
if (!file) {
tc_log_error(MOD_NAME, "Unable to open %s: %s", vob->audio_in_file,
strerror(errno));
return TC_ERROR;
}
/* Check whether this is an MPEG stream and enable the hacks if needed */
if (fread(buf, 5, 1, file) != 1) {
tc_log_error(MOD_NAME, "File %s is empty!", vob->audio_in_file);
fclose(file);
file = NULL;
return TC_ERROR;
}
if ((buf[0]<<24 | buf[1]<<16 | buf[2]<<8 | buf[3]) == TC_MAGIC_VOB) {
mpeg_mode = 1;
mpeg_packet_left = 0;
mpeg_check_for_header = 1;
mpeg_stop = 0;
if ((buf[4] & 0xC0) == 0x40) { /* mpeg2 */
if (fread(buf, 9, 1, file) != 1) {
tc_log_error(MOD_NAME, "%s: short file!", vob->audio_in_file);
goto close_and_abort;
}
if ((buf[8] & 7) && fread(buf, buf[8] & 7, 1, file) != 1) {
tc_log_error(MOD_NAME, "%s: short file!", vob->audio_in_file);
goto close_and_abort;
}
} else if ((buf[4] & 0xF0) == 0x20) { /* mpeg1 */
if (fread(buf, 7, 1, file) != 1) {
tc_log_error(MOD_NAME, "%s: short file!", vob->audio_in_file);
goto close_and_abort;
}
} else {
tc_log_error(MOD_NAME, "%s: bizarre MPEG stream!",
vob->audio_in_file);
goto close_and_abort;
}
} else {
mpeg_mode = 0;
if (vob->a_chan == 2) {
memcpy(static_pd.databuf, buf, 5);
if (fread(static_pd.databuf+5,static_pd.blocksize-5,1,file) != 1) {
tc_log_error(MOD_NAME, "%s: short file!", vob->audio_in_file);
goto close_and_abort;
}
static_pd.datalen = static_pd.blocksize;
} else { /* mono */
if (fread(buf+5, 11, 1, file) != 1) {
tc_log_error(MOD_NAME, "%s: short file!", vob->audio_in_file);
goto close_and_abort;
}
do_decode(buf, saved_samples, 0, &static_pd);
saved_samples_count = 28;
}
} /* if an MPEG stream */
return TC_OK;
close_and_abort:
fclose(file);
file = NULL;
return TC_ERROR;
}
/*************************************************************************/
MOD_close
{
if (verbose & TC_DEBUG)
tc_log_info(MOD_NAME, "%d bytes processed", static_pd.totalread);
if (static_pd.nclip > 0)
tc_log_info(MOD_NAME, "%d samples clipped", static_pd.nclip);
if (file) {
fclose(file);
file = NULL;
}
return TC_OK;
}
/*************************************************************************/
/**
* xread: Read data like fread(), but if `mpeg_mode' is nonzero, extract
* the data from the MPEG stream. Parameters and return value are as for
* fread() (except that the buffer is of type uint8_t * for simplicity).
* This is a really ugly hack; I hope the new module system gets moving
* soon...
*/
static size_t xread(uint8_t *buf, size_t elsize, size_t els, FILE *f)
{
int nread; /* Total bytes read */
uint8_t readbuf[2048];
if (!mpeg_mode)
return fread(buf, elsize, els, f);
if (mpeg_stop)
return TC_OK;
nread = 0;
if (mpeg_packet_left > 0) {
if (mpeg_packet_left >= elsize*els) {
nread = fread(buf, 1, elsize*els, f);
mpeg_packet_left -= nread;
return nread / elsize;
} else {
nread = fread(buf, 1, mpeg_packet_left, f);
if (nread < mpeg_packet_left) /* EOF */
return TC_OK;
mpeg_packet_left = 0;
}
}
while (nread < elsize*els) {
if (fread(readbuf, 4, 1, f) != 1)
break;
if (memcmp(readbuf, "\0\0\1", 3) != 0) {
tc_log_warn(MOD_NAME, "No start code found at %ld",
(long)ftell(f)-4);
break;
}
if (verbose & TC_DEBUG) {
tc_log_msg(MOD_NAME, "Start code 0x%02X at %ld", readbuf[3],
(long)ftell(f)-4);
}
if (readbuf[3] == 0xB9) { /* program end */
if (verbose & TC_DEBUG)
tc_log_msg(MOD_NAME, "Program end code found");
mpeg_stop = 1;
break;
} else if (readbuf[3] == 0xBA) {
if (fread(readbuf, 8, 1, f) != 1)
break;
if ((readbuf[0] & 0xC0) == 0x40) { /* mpeg2 */
if (fread(readbuf, 2, 1, f) != 1)
break;
if ((readbuf[1]&7) && fread(readbuf, readbuf[1]&7, 1, f) != 1)
break;
}
} else {
int packetlen;
if (fread(readbuf+4, 2, 1, f) != 1)
break;
packetlen = readbuf[4]<<8 | readbuf[5];
if (readbuf[3] != 0xBD) {
while (packetlen > 0) {
int toread = sizeof(readbuf);
if (toread > packetlen)
toread = packetlen;
if (fread(readbuf, toread, 1, f) != 1)
break;
packetlen -= toread;
}
if (packetlen > 0) /* i.e. read failed in the while loop */
break;
} else {
/* 0xBD==private stream 1: get stream ID (VAG audio is 0xFF) */
if (fread(readbuf, 1, 1, f) != 1)
break;
packetlen -= 1;
if ((readbuf[0] & 0xC0) == 0x80) { /* mpeg2 */
if (fread(readbuf, 2, 1, f) != 1)
break;
packetlen -= 2+readbuf[1];
if (fread(readbuf, readbuf[1], 1, f) != 1)
break;
} else { /* mpeg1 */
int skipbytes;
while (readbuf[0] == 0xFF) {
if (fread(readbuf, 1, 1, f) != 1)
break;
packetlen -= 1;
}
if (readbuf[0] == 0xFF) /* i.e. read failed */
break;
if ((readbuf[0] & 0xC0) == 0x40) {
if (fread(readbuf, 2, 1, f) != 1)
break;
packetlen -= 2;
readbuf[0] = readbuf[1];
}
switch (readbuf[0] >> 4) {
case 0: skipbytes = 1; break;
case 2: skipbytes = 5; break;
case 3: skipbytes = 10; break;
default: skipbytes = 0; break;
}
if (skipbytes) {
if (fread(readbuf, skipbytes, 1, f) != 1)
break;
packetlen -= skipbytes;
}
}
if (fread(readbuf, 1, 1, f) != 1)
break;
packetlen -= 1;
if (packetlen > 1) {
if (fread(readbuf+1, 1, 1, f) != 1)
break;
packetlen -= 1;
} else {
readbuf[1] = 0; // anything but 0xA1
}
if (verbose & TC_DEBUG) {
tc_log_msg(MOD_NAME, "... stream code %02X %02X",
readbuf[0], readbuf[1]);
}
if (readbuf[0] != 0xFF || readbuf[1] != 0xA1) {
while (packetlen > 0) {
int toread = sizeof(readbuf);
if (toread > packetlen)
toread = packetlen;
if (fread(readbuf, toread, 1, f) != 1)
break;
packetlen -= toread;
}
if (packetlen > 0) /* i.e. read failed */
break;
} else if (packetlen < 2) {
/* okay, enough is enough */
tc_log_error(MOD_NAME,
"private stream 1 packet too small!!");
return TC_OK;
} else {
/* A desired data packet, at last */
int toread;
if (fread(readbuf, 2, 1, f) != 1)
break;
packetlen -= 2;
/* FIXME: this won't work if we read 1 byte at a time */
if (mpeg_check_for_header
&& packetlen >= 4
&& nread+4 <= els*elsize
) {
mpeg_check_for_header = 0;
if (fread(readbuf, 4, 1, f) != 1)
break;
packetlen -= 4;
if (memcmp(readbuf,"SShd",4) == 0 && packetlen >= 36) {
int bits, rate, chans, block, size;
if (fread(readbuf+4, 36, 1, f) != 1)
break;
packetlen -= 36;
bits = readbuf[ 8] | readbuf[ 9]<<8
| readbuf[10]<<16 | readbuf[11]<<24;
rate = readbuf[12] | readbuf[13]<<8
| readbuf[14]<<16 | readbuf[15]<<24;
chans = readbuf[16] | readbuf[17]<<8
| readbuf[18]<<16 | readbuf[19]<<24;
block = readbuf[20] | readbuf[21]<<8
| readbuf[22]<<16 | readbuf[23]<<24;
size = readbuf[36] | readbuf[37]<<8
| readbuf[38]<<16 | readbuf[39]<<24;
tc_log_info(MOD_NAME,
"MPEG-embedded audio: %d/%d/%d,"
" stereo blocksize %d, %d data bytes",
rate, bits, chans, block, size);
} else {
memcpy(buf+nread, readbuf, 4);
nread += 4;
}
}
/* Whew, now we can start reading */
toread = els*elsize - nread;
if (toread > packetlen)
toread = packetlen;
toread = fread(buf+nread, 1, toread, f);
nread += toread;
mpeg_packet_left = packetlen - toread;
if (mpeg_packet_left > 0)
break; /* stopped reading in the middle */
}
} /* if 0xBD */
} /* if not 0xB9/0xBA */
} /* while bytes left to read */
return nread / elsize;
}
/*************************************************************************/
MOD_decode
{
uint8_t inbuf[16];
int outlimit = param->size / 2;
int outcount = 0; /* total samples for the frame */
while (outcount < outlimit) {
/* First save any samples in the output buffer */
if (saved_samples_count > 0) {
if (outcount + saved_samples_count > outlimit) {
int nleft = outlimit - outcount;
memcpy(param->buffer + outcount*2, saved_samples, nleft*2);
outcount += nleft;
saved_samples_count -= nleft;
memmove(saved_samples, saved_samples + nleft,
saved_samples_count*2);
break;
} else {
memcpy(param->buffer + outcount*2, saved_samples,
saved_samples_count*2);
outcount += saved_samples_count;
saved_samples_count = 0;
}
}
/* Now read the next block of data and decode it to the output buffer*/
if (vob->a_chan == 2 && static_pd.datapos >= static_pd.datalen) {
/* Finished the previous stereo block, read a new one */
if (xread(static_pd.databuf, static_pd.blocksize, 1, file) != 1) {
if (verbose & TC_DEBUG)
tc_log_msg(MOD_NAME, "EOF reached");
break;
}
static_pd.datalen = static_pd.blocksize;
static_pd.datapos = 0;
}
if (xread(inbuf, 16, 1, file) != 1) {
if (verbose & TC_DEBUG)
tc_log_msg(MOD_NAME, "EOF reached");
break;
}
if (vob->a_chan == 1) {
do_decode(inbuf, saved_samples, 0, &static_pd);
saved_samples_count = 28;
} else {
uint16_t outbuf0[28], outbuf1[28];
int i;
do_decode(inbuf, outbuf0, 0, &static_pd);
do_decode(inbuf, outbuf1, 1, &static_pd);
for (i = 0; i < 28; i++) {
saved_samples[i*2 ] = outbuf0[i];
saved_samples[i*2+1] = outbuf1[i];
}
saved_samples_count = 56;
static_pd.datapos += 16;
}
}
/* All done, set final size and return */
param->size = outcount*2;
return outcount<outlimit ? -1 : 0;
}
/*************************************************************************/
/*
* Local variables:
* c-file-style: "stroustrup"
* c-file-offsets: ((case-label . *) (statement-case-intro . *))
* indent-tabs-mode: nil
* End:
*
* vim: expandtab shiftwidth=4:
*/
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