/* Copyright (C) 2002-2006 Jean-Marc Valin
File: speexenc.c
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of the Xiph.org Foundation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#if !defined WIN32 && !defined _WIN32
#include <unistd.h>
#include <getopt.h>
#endif
#ifndef HAVE_GETOPT_LONG
#include "getopt_win.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <speex/speex.h>
#include <ogg/ogg.h>
#include "wav_io.h"
#include <speex/speex_header.h>
#include <speex/speex_stereo.h>
#include <speex/speex_preprocess.h>
#if defined WIN32 || defined _WIN32
#include "getopt_win.h"
/* We need the following two to set stdout to binary */
#include <io.h>
#include <fcntl.h>
#endif
void comment_init(char **comments, int* length, char *vendor_string);
void comment_add(char **comments, int* length, char *tag, char *val);
/*Write an Ogg page to a file pointer*/
int oe_write_page(ogg_page *page, FILE *fp)
{
int written;
written = fwrite(page->header,1,page->header_len, fp);
written += fwrite(page->body,1,page->body_len, fp);
return written;
}
#define MAX_FRAME_SIZE 2000
#define MAX_FRAME_BYTES 2000
/* Convert input audio bits, endians and channels */
static int read_samples(FILE *fin,int frame_size, int bits, int channels, int lsb, short * input, char *buff, int *size)
{
unsigned char in[MAX_FRAME_BYTES*2];
int i;
short *s;
int nb_read;
if (size && *size<=0)
{
return 0;
}
/*Read input audio*/
if (size)
*size -= bits/8*channels*frame_size;
if (buff)
{
for (i=0;i<12;i++)
in[i]=buff[i];
nb_read = fread(in+12,1,bits/8*channels*frame_size-12, fin) + 12;
if (size)
*size += 12;
} else {
nb_read = fread(in,1,bits/8*channels* frame_size, fin);
}
nb_read /= bits/8*channels;
/*fprintf (stderr, "%d\n", nb_read);*/
if (nb_read==0)
return 0;
s=(short*)in;
if(bits==8)
{
/* Convert 8->16 bits */
for(i=frame_size*channels-1;i>=0;i--)
{
s[i]=(in[i]<<8)^0x8000;
}
} else
{
/* convert to our endian format */
for(i=0;i<frame_size*channels;i++)
{
if(lsb)
s[i]=le_short(s[i]);
else
s[i]=be_short(s[i]);
}
}
/* FIXME: This is probably redundent now */
/* copy to float input buffer */
for (i=0;i<frame_size*channels;i++)
{
input[i]=(short)s[i];
}
for (i=nb_read*channels;i<frame_size*channels;i++)
{
input[i]=0;
}
return nb_read;
}
void version()
{
printf ("speexenc (Speex encoder) version " SPEEX_VERSION " (compiled " __DATE__ ")\n");
printf ("Copyright (C) 2002-2006 Jean-Marc Valin\n");
}
void version_short()
{
printf ("speexenc version " SPEEX_VERSION "\n");
printf ("Copyright (C) 2002-2006 Jean-Marc Valin\n");
}
void usage()
{
printf ("Usage: speexenc [options] input_file output_file\n");
printf ("\n");
printf ("Encodes input_file using Speex. It can read the WAV or raw files.\n");
printf ("\n");
printf ("input_file can be:\n");
printf (" filename.wav wav file\n");
printf (" filename.* Raw PCM file (any extension other than .wav)\n");
printf (" - stdin\n");
printf ("\n");
printf ("output_file can be:\n");
printf (" filename.spx Speex file\n");
printf (" - stdout\n");
printf ("\n");
printf ("Options:\n");
printf (" -n, --narrowband Narrowband (8 kHz) input file\n");
printf (" -w, --wideband Wideband (16 kHz) input file\n");
printf (" -u, --ultra-wideband \"Ultra-wideband\" (32 kHz) input file\n");
printf (" --quality n Encoding quality (0-10), default 8\n");
printf (" --bitrate n Encoding bit-rate (use bit-rate n or lower)\n");
printf (" --vbr Enable variable bit-rate (VBR)\n");
printf (" --abr rate Enable average bit-rate (ABR) at rate bps\n");
printf (" --vad Enable voice activity detection (VAD)\n");
printf (" --dtx Enable file-based discontinuous transmission (DTX)\n");
printf (" --comp n Set encoding complexity (0-10), default 3\n");
printf (" --nframes n Number of frames per Ogg packet (1-10), default 1\n");
printf (" --denoise Denoise the input before encoding\n");
printf (" --agc Apply adaptive gain control (AGC) before encoding\n");
printf (" --comment Add the given string as an extra comment. This may be\n");
printf (" used multiple times\n");
printf (" --author Author of this track\n");
printf (" --title Title for this track\n");
printf (" -h, --help This help\n");
printf (" -v, --version Version information\n");
printf (" -V Verbose mode (show bit-rate)\n");
printf ("Raw input options:\n");
printf (" --rate n Sampling rate for raw input\n");
printf (" --stereo Consider raw input as stereo\n");
printf (" --le Raw input is little-endian\n");
printf (" --be Raw input is big-endian\n");
printf (" --8bit Raw input is 8-bit unsigned\n");
printf (" --16bit Raw input is 16-bit signed\n");
printf ("Default raw PCM input is 16-bit, little-endian, mono\n");
printf ("\n");
printf ("More information is available from the Speex site: http://www.speex.org\n");
printf ("\n");
printf ("Please report bugs to the mailing list `speex-dev@xiph.org'.\n");
}
int main(int argc, char **argv)
{
int nb_samples, total_samples=0, nb_encoded;
int c;
int option_index = 0;
char *inFile, *outFile;
FILE *fin, *fout;
short input[MAX_FRAME_SIZE];
int frame_size;
int quiet=0;
int vbr_enabled=0;
int abr_enabled=0;
int vad_enabled=0;
int dtx_enabled=0;
int nbBytes;
const SpeexMode *mode=NULL;
int modeID = -1;
void *st;
SpeexBits bits;
char cbits[MAX_FRAME_BYTES];
struct option long_options[] =
{
{"wideband", no_argument, NULL, 0},
{"ultra-wideband", no_argument, NULL, 0},
{"narrowband", no_argument, NULL, 0},
{"vbr", no_argument, NULL, 0},
{"abr", required_argument, NULL, 0},
{"vad", no_argument, NULL, 0},
{"dtx", no_argument, NULL, 0},
{"quality", required_argument, NULL, 0},
{"bitrate", required_argument, NULL, 0},
{"nframes", required_argument, NULL, 0},
{"comp", required_argument, NULL, 0},
{"denoise", no_argument, NULL, 0},
{"agc", no_argument, NULL, 0},
{"help", no_argument, NULL, 0},
{"quiet", no_argument, NULL, 0},
{"le", no_argument, NULL, 0},
{"be", no_argument, NULL, 0},
{"8bit", no_argument, NULL, 0},
{"16bit", no_argument, NULL, 0},
{"stereo", no_argument, NULL, 0},
{"rate", required_argument, NULL, 0},
{"version", no_argument, NULL, 0},
{"version-short", no_argument, NULL, 0},
{"comment", required_argument, NULL, 0},
{"author", required_argument, NULL, 0},
{"title", required_argument, NULL, 0},
{0, 0, 0, 0}
};
int print_bitrate=0;
int rate=0, size;
int chan=1;
int fmt=16;
int quality=-1;
float vbr_quality=-1;
int lsb=1;
ogg_stream_state os;
ogg_page og;
ogg_packet op;
int bytes_written=0, ret, result;
int id=-1;
SpeexHeader header;
int nframes=1;
int complexity=3;
char *vendor_string = "Encoded with Speex " SPEEX_VERSION;
char *comments;
int comments_length;
int close_in=0, close_out=0;
int eos=0;
int bitrate=0;
double cumul_bits=0, enc_frames=0;
char first_bytes[12];
int wave_input=0;
int tmp;
SpeexPreprocessState *preprocess = NULL;
int denoise_enabled=0, agc_enabled=0;
int lookahead = 0;
comment_init(&comments, &comments_length, vendor_string);
/*Process command-line options*/
while(1)
{
c = getopt_long (argc, argv, "nwuhvV",
long_options, &option_index);
if (c==-1)
break;
switch(c)
{
case 0:
if (strcmp(long_options[option_index].name,"narrowband")==0)
{
modeID = SPEEX_MODEID_NB;
} else if (strcmp(long_options[option_index].name,"wideband")==0)
{
modeID = SPEEX_MODEID_WB;
} else if (strcmp(long_options[option_index].name,"ultra-wideband")==0)
{
modeID = SPEEX_MODEID_UWB;
} else if (strcmp(long_options[option_index].name,"vbr")==0)
{
vbr_enabled=1;
} else if (strcmp(long_options[option_index].name,"abr")==0)
{
abr_enabled=atoi(optarg);
if (!abr_enabled)
{
fprintf (stderr, "Invalid ABR value: %d\n", abr_enabled);
exit(1);
}
} else if (strcmp(long_options[option_index].name,"vad")==0)
{
vad_enabled=1;
} else if (strcmp(long_options[option_index].name,"dtx")==0)
{
dtx_enabled=1;
} else if (strcmp(long_options[option_index].name,"quality")==0)
{
quality = atoi (optarg);
vbr_quality=atof(optarg);
} else if (strcmp(long_options[option_index].name,"bitrate")==0)
{
bitrate = atoi (optarg);
} else if (strcmp(long_options[option_index].name,"nframes")==0)
{
nframes = atoi (optarg);
if (nframes<1)
nframes=1;
if (nframes>10)
nframes=10;
} else if (strcmp(long_options[option_index].name,"comp")==0)
{
complexity = atoi (optarg);
} else if (strcmp(long_options[option_index].name,"denoise")==0)
{
denoise_enabled=1;
} else if (strcmp(long_options[option_index].name,"agc")==0)
{
agc_enabled=1;
} else if (strcmp(long_options[option_index].name,"help")==0)
{
usage();
exit(0);
} else if (strcmp(long_options[option_index].name,"quiet")==0)
{
quiet = 1;
} else if (strcmp(long_options[option_index].name,"version")==0)
{
version();
exit(0);
} else if (strcmp(long_options[option_index].name,"version-short")==0)
{
version_short();
exit(0);
} else if (strcmp(long_options[option_index].name,"le")==0)
{
lsb=1;
} else if (strcmp(long_options[option_index].name,"be")==0)
{
lsb=0;
} else if (strcmp(long_options[option_index].name,"8bit")==0)
{
fmt=8;
} else if (strcmp(long_options[option_index].name,"16bit")==0)
{
fmt=16;
} else if (strcmp(long_options[option_index].name,"stereo")==0)
{
chan=2;
} else if (strcmp(long_options[option_index].name,"rate")==0)
{
rate=atoi (optarg);
} else if (strcmp(long_options[option_index].name,"comment")==0)
{
if (!strchr(optarg, '='))
{
fprintf (stderr, "Invalid comment: %s\n", optarg);
fprintf (stderr, "Comments must be of the form name=value\n");
exit(1);
}
comment_add(&comments, &comments_length, NULL, optarg);
} else if (strcmp(long_options[option_index].name,"author")==0)
{
comment_add(&comments, &comments_length, "author=", optarg);
} else if (strcmp(long_options[option_index].name,"title")==0)
{
comment_add(&comments, &comments_length, "title=", optarg);
}
break;
case 'n':
modeID = SPEEX_MODEID_NB;
break;
case 'h':
usage();
exit(0);
break;
case 'v':
version();
exit(0);
break;
case 'V':
print_bitrate=1;
break;
case 'w':
modeID = SPEEX_MODEID_WB;
break;
case 'u':
modeID = SPEEX_MODEID_UWB;
break;
case '?':
usage();
exit(1);
break;
}
}
if (argc-optind!=2)
{
usage();
exit(1);
}
inFile=argv[optind];
outFile=argv[optind+1];
/*Initialize Ogg stream struct*/
srand(time(NULL));
if (ogg_stream_init(&os, rand())==-1)
{
fprintf(stderr,"Error: stream init failed\n");
exit(1);
}
if (strcmp(inFile, "-")==0)
{
#if defined WIN32 || defined _WIN32
_setmode(_fileno(stdin), _O_BINARY);
#endif
fin=stdin;
}
else
{
fin = fopen(inFile, "rb");
if (!fin)
{
perror(inFile);
exit(1);
}
close_in=1;
}
{
fread(first_bytes, 1, 12, fin);
if (strncmp(first_bytes,"RIFF",4)==0 && strncmp(first_bytes,"RIFF",4)==0)
{
if (read_wav_header(fin, &rate, &chan, &fmt, &size)==-1)
exit(1);
wave_input=1;
lsb=1; /* CHECK: exists big-endian .wav ?? */
}
}
if (modeID==-1 && !rate)
{
/* By default, use narrowband/8 kHz */
modeID = SPEEX_MODEID_NB;
rate=8000;
} else if (modeID!=-1 && rate)
{
mode = speex_lib_get_mode (modeID);
if (rate>48000)
{
fprintf (stderr, "Error: sampling rate too high: %d Hz, try down-sampling\n", rate);
exit(1);
} else if (rate>25000)
{
if (modeID != SPEEX_MODEID_UWB)
{
fprintf (stderr, "Warning: Trying to encode in %s at %d Hz. I'll do it but I suggest you try ultra-wideband instead\n", mode->modeName , rate);
}
} else if (rate>12500)
{
if (modeID != SPEEX_MODEID_WB)
{
fprintf (stderr, "Warning: Trying to encode in %s at %d Hz. I'll do it but I suggest you try wideband instead\n", mode->modeName , rate);
}
} else if (rate>=6000)
{
if (modeID != SPEEX_MODEID_NB)
{
fprintf (stderr, "Warning: Trying to encode in %s at %d Hz. I'll do it but I suggest you try narrowband instead\n", mode->modeName , rate);
}
} else {
fprintf (stderr, "Error: sampling rate too low: %d Hz\n", rate);
exit(1);
}
} else if (modeID==-1)
{
if (rate>48000)
{
fprintf (stderr, "Error: sampling rate too high: %d Hz, try down-sampling\n", rate);
exit(1);
} else if (rate>25000)
{
modeID = SPEEX_MODEID_UWB;
} else if (rate>12500)
{
modeID = SPEEX_MODEID_WB;
} else if (rate>=6000)
{
modeID = SPEEX_MODEID_NB;
} else {
fprintf (stderr, "Error: Sampling rate too low: %d Hz\n", rate);
exit(1);
}
} else if (!rate)
{
if (modeID == SPEEX_MODEID_NB)
rate=8000;
else if (modeID == SPEEX_MODEID_WB)
rate=16000;
else if (modeID == SPEEX_MODEID_UWB)
rate=32000;
}
if (!quiet)
if (rate!=8000 && rate!=16000 && rate!=32000)
fprintf (stderr, "Warning: Speex is only optimized for 8, 16 and 32 kHz. It will still work at %d Hz but your mileage may vary\n", rate);
if (!mode)
mode = speex_lib_get_mode (modeID);
speex_init_header(&header, rate, 1, mode);
header.frames_per_packet=nframes;
header.vbr=vbr_enabled;
header.nb_channels = chan;
{
char *st_string="mono";
if (chan==2)
st_string="stereo";
if (!quiet)
fprintf (stderr, "Encoding %d Hz audio using %s mode (%s)\n",
header.rate, mode->modeName, st_string);
}
/*fprintf (stderr, "Encoding %d Hz audio at %d bps using %s mode\n",
header.rate, mode->bitrate, mode->modeName);*/
/*Initialize Speex encoder*/
st = speex_encoder_init(mode);
if (strcmp(outFile,"-")==0)
{
#if defined WIN32 || defined _WIN32
_setmode(_fileno(stdout), _O_BINARY);
#endif
fout=stdout;
}
else
{
fout = fopen(outFile, "wb");
if (!fout)
{
perror(outFile);
exit(1);
}
close_out=1;
}
speex_encoder_ctl(st, SPEEX_GET_FRAME_SIZE, &frame_size);
speex_encoder_ctl(st, SPEEX_SET_COMPLEXITY, &complexity);
speex_encoder_ctl(st, SPEEX_SET_SAMPLING_RATE, &rate);
if (quality >= 0)
{
if (vbr_enabled)
speex_encoder_ctl(st, SPEEX_SET_VBR_QUALITY, &vbr_quality);
else
speex_encoder_ctl(st, SPEEX_SET_QUALITY, &quality);
}
if (bitrate)
{
if (quality >= 0 && vbr_enabled)
fprintf (stderr, "Warning: --bitrate option is overriding --quality\n");
speex_encoder_ctl(st, SPEEX_SET_BITRATE, &bitrate);
}
if (vbr_enabled)
{
tmp=1;
speex_encoder_ctl(st, SPEEX_SET_VBR, &tmp);
} else if (vad_enabled)
{
tmp=1;
speex_encoder_ctl(st, SPEEX_SET_VAD, &tmp);
}
if (dtx_enabled)
speex_encoder_ctl(st, SPEEX_SET_DTX, &tmp);
if (dtx_enabled && !(vbr_enabled || abr_enabled || vad_enabled))
{
fprintf (stderr, "Warning: --dtx is useless without --vad, --vbr or --abr\n");
} else if ((vbr_enabled || abr_enabled) && (vad_enabled))
{
fprintf (stderr, "Warning: --vad is already implied by --vbr or --abr\n");
}
if (abr_enabled)
{
speex_encoder_ctl(st, SPEEX_SET_ABR, &abr_enabled);
}
speex_encoder_ctl(st, SPEEX_GET_LOOKAHEAD, &lookahead);
if (denoise_enabled || agc_enabled)
{
preprocess = speex_preprocess_state_init(frame_size, rate);
speex_preprocess_ctl(preprocess, SPEEX_PREPROCESS_SET_DENOISE, &denoise_enabled);
speex_preprocess_ctl(preprocess, SPEEX_PREPROCESS_SET_AGC, &agc_enabled);
lookahead += frame_size;
}
/*Write header*/
{
int packet_size;
op.packet = (unsigned char *)speex_header_to_packet(&header, &packet_size);
op.bytes = packet_size;
op.b_o_s = 1;
op.e_o_s = 0;
op.granulepos = 0;
op.packetno = 0;
ogg_stream_packetin(&os, &op);
free(op.packet);
op.packet = (unsigned char *)comments;
op.bytes = comments_length;
op.b_o_s = 0;
op.e_o_s = 0;
op.granulepos = 0;
op.packetno = 1;
ogg_stream_packetin(&os, &op);
while((result = ogg_stream_flush(&os, &og)))
{
if(!result) break;
ret = oe_write_page(&og, fout);
if(ret != og.header_len + og.body_len)
{
fprintf (stderr,"Error: failed writing header to output stream\n");
exit(1);
}
else
bytes_written += ret;
}
}
free(comments);
speex_bits_init(&bits);
if (!wave_input)
{
nb_samples = read_samples(fin,frame_size,fmt,chan,lsb,input, first_bytes, NULL);
} else {
nb_samples = read_samples(fin,frame_size,fmt,chan,lsb,input, NULL, &size);
}
if (nb_samples==0)
eos=1;
total_samples += nb_samples;
nb_encoded = -lookahead;
/*Main encoding loop (one frame per iteration)*/
while (!eos || total_samples>nb_encoded)
{
id++;
/*Encode current frame*/
if (chan==2)
speex_encode_stereo_int(input, frame_size, &bits);
if (preprocess)
speex_preprocess(preprocess, input, NULL);
speex_encode_int(st, input, &bits);
nb_encoded += frame_size;
if (print_bitrate) {
int tmp;
char ch=13;
speex_encoder_ctl(st, SPEEX_GET_BITRATE, &tmp);
fputc (ch, stderr);
cumul_bits += tmp;
enc_frames += 1;
if (!quiet)
{
if (vad_enabled || vbr_enabled || abr_enabled)
fprintf (stderr, "Bitrate is use: %d bps (average %d bps) ", tmp, (int)(cumul_bits/enc_frames));
else
fprintf (stderr, "Bitrate is use: %d bps ", tmp);
}
}
if (wave_input)
{
nb_samples = read_samples(fin,frame_size,fmt,chan,lsb,input, NULL, &size);
} else {
nb_samples = read_samples(fin,frame_size,fmt,chan,lsb,input, NULL, NULL);
}
if (nb_samples==0)
{
eos=1;
}
if (eos && total_samples<=nb_encoded)
op.e_o_s = 1;
else
op.e_o_s = 0;
total_samples += nb_samples;
if ((id+1)%nframes!=0)
continue;
speex_bits_insert_terminator(&bits);
nbBytes = speex_bits_write(&bits, cbits, MAX_FRAME_BYTES);
speex_bits_reset(&bits);
op.packet = (unsigned char *)cbits;
op.bytes = nbBytes;
op.b_o_s = 0;
/*Is this redundent?*/
if (eos && total_samples<=nb_encoded)
op.e_o_s = 1;
else
op.e_o_s = 0;
op.granulepos = (id+1)*frame_size-lookahead;
if (op.granulepos>total_samples)
op.granulepos = total_samples;
/*printf ("granulepos: %d %d %d %d %d %d\n", (int)op.granulepos, id, nframes, lookahead, 5, 6);*/
op.packetno = 2+id/nframes;
ogg_stream_packetin(&os, &op);
/*Write all new pages (most likely 0 or 1)*/
while (ogg_stream_pageout(&os,&og))
{
ret = oe_write_page(&og, fout);
if(ret != og.header_len + og.body_len)
{
fprintf (stderr,"Error: failed writing header to output stream\n");
exit(1);
}
else
bytes_written += ret;
}
}
if ((id+1)%nframes!=0)
{
while ((id+1)%nframes!=0)
{
id++;
speex_bits_pack(&bits, 15, 5);
}
nbBytes = speex_bits_write(&bits, cbits, MAX_FRAME_BYTES);
op.packet = (unsigned char *)cbits;
op.bytes = nbBytes;
op.b_o_s = 0;
op.e_o_s = 1;
op.granulepos = (id+1)*frame_size-lookahead;
if (op.granulepos>total_samples)
op.granulepos = total_samples;
op.packetno = 2+id/nframes;
ogg_stream_packetin(&os, &op);
}
/*Flush all pages left to be written*/
while (ogg_stream_flush(&os, &og))
{
ret = oe_write_page(&og, fout);
if(ret != og.header_len + og.body_len)
{
fprintf (stderr,"Error: failed writing header to output stream\n");
exit(1);
}
else
bytes_written += ret;
}
speex_encoder_destroy(st);
speex_bits_destroy(&bits);
ogg_stream_clear(&os);
if (close_in)
fclose(fin);
if (close_out)
fclose(fout);
return 0;
}
/*
Comments will be stored in the Vorbis style.
It is describled in the "Structure" section of
http://www.xiph.org/ogg/vorbis/doc/v-comment.html
The comment header is decoded as follows:
1) [vendor_length] = read an unsigned integer of 32 bits
2) [vendor_string] = read a UTF-8 vector as [vendor_length] octets
3) [user_comment_list_length] = read an unsigned integer of 32 bits
4) iterate [user_comment_list_length] times {
5) [length] = read an unsigned integer of 32 bits
6) this iteration's user comment = read a UTF-8 vector as [length] octets
}
7) [framing_bit] = read a single bit as boolean
8) if ( [framing_bit] unset or end of packet ) then ERROR
9) done.
If you have troubles, please write to ymnk@jcraft.com.
*/
#define readint(buf, base) (((buf[base+3]<<24)&0xff000000)| \
((buf[base+2]<<16)&0xff0000)| \
((buf[base+1]<<8)&0xff00)| \
(buf[base]&0xff))
#define writeint(buf, base, val) do{ buf[base+3]=((val)>>24)&0xff; \
buf[base+2]=((val)>>16)&0xff; \
buf[base+1]=((val)>>8)&0xff; \
buf[base]=(val)&0xff; \
}while(0)
void comment_init(char **comments, int* length, char *vendor_string)
{
int vendor_length=strlen(vendor_string);
int user_comment_list_length=0;
int len=4+vendor_length+4;
char *p=(char*)malloc(len);
if(p==NULL){
}
writeint(p, 0, vendor_length);
memcpy(p+4, vendor_string, vendor_length);
writeint(p, 4+vendor_length, user_comment_list_length);
*length=len;
*comments=p;
}
void comment_add(char **comments, int* length, char *tag, char *val)
{
char* p=*comments;
int vendor_length=readint(p, 0);
int user_comment_list_length=readint(p, 4+vendor_length);
int tag_len=(tag?strlen(tag):0);
int val_len=strlen(val);
int len=(*length)+4+tag_len+val_len;
p=(char*)realloc(p, len);
if(p==NULL){
}
writeint(p, *length, tag_len+val_len); /* length of comment */
if(tag) memcpy(p+*length+4, tag, tag_len); /* comment */
memcpy(p+*length+4+tag_len, val, val_len); /* comment */
writeint(p, 4+vendor_length, user_comment_list_length+1);
*comments=p;
*length=len;
}
#undef readint
#undef writeint
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