mpv/libmpdemux/realrtsp/sdpplin.c

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/*
* This file was ported to MPlayer from xine CVS sdpplin.c,v 1.1 2002/12/24 01:30:22
*/
/*
* Copyright (C) 2002 the xine project
*
* This file is part of xine, a free video player.
*
* xine is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* xine is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
*
* sdp/sdpplin parser.
*
*/
#include "rmff.h"
#include "rtsp.h"
#include "sdpplin.h"
#include "xbuffer.h"
/*
#define LOG
*/
/*
* Decodes base64 strings (based upon b64 package)
*/
static char *b64_decode(const char *in, char *out, int *size)
{
char dtable[256]; /* Encode / decode table */
int i,j,k;
for (i = 0; i < 255; i++) {
dtable[i] = 0x80;
}
for (i = 'A'; i <= 'Z'; i++) {
dtable[i] = 0 + (i - 'A');
}
for (i = 'a'; i <= 'z'; i++) {
dtable[i] = 26 + (i - 'a');
}
for (i = '0'; i <= '9'; i++) {
dtable[i] = 52 + (i - '0');
}
dtable['+'] = 62;
dtable['/'] = 63;
dtable['='] = 0;
k=0;
/*CONSTANTCONDITION*/
for (j=0; j<strlen(in); j+=4)
{
char a[4], b[4];
for (i = 0; i < 4; i++) {
int c = in[i+j];
if (dtable[c] & 0x80) {
printf("Illegal character '%c' in input.\n", c);
// exit(1);
return NULL;
}
a[i] = (char) c;
b[i] = (char) dtable[c];
}
out = xbuffer_ensure_size(out, k+3);
out[k++] = (b[0] << 2) | (b[1] >> 4);
out[k++] = (b[1] << 4) | (b[2] >> 2);
out[k++] = (b[2] << 6) | b[3];
i = a[2] == '=' ? 1 : (a[3] == '=' ? 2 : 3);
if (i < 3) {
out[k]=0;
*size=k;
return out;
}
}
out[k]=0;
*size=k;
return out;
}
static char *nl(char *data) {
char *nlptr = (data) ? strchr(data,'\n') : NULL;
return (nlptr) ? nlptr + 1 : NULL;
}
static int filter(const char *in, const char *filter, char **out) {
int flen=strlen(filter);
int len;
if (!in)
return 0;
len = (strchr(in,'\n')) ? strchr(in,'\n')-in : strlen(in);
if (!strncmp(in,filter,flen))
{
if(in[flen]=='"') flen++;
if(in[len-1]==13) len--;
if(in[len-1]=='"') len--;
*out = xbuffer_copyin(*out, 0, in+flen, len-flen+1);
(*out)[len-flen]=0;
return len-flen;
}
return 0;
}
static sdpplin_stream_t *sdpplin_parse_stream(char **data) {
sdpplin_stream_t *desc=calloc(1,sizeof(sdpplin_stream_t));
char *buf=xbuffer_init(32);
char *decoded=xbuffer_init(32);
int handled;
if (filter(*data, "m=", &buf)) {
desc->id = strdup(buf);
} else
{
printf("sdpplin: no m= found.\n");
free(desc);
xbuffer_free(buf);
return NULL;
}
*data=nl(*data);
while (*data && **data && *data[0]!='m') {
handled=0;
if(filter(*data,"a=control:streamid=",&buf)) {
desc->stream_id=atoi(buf);
handled=1;
*data=nl(*data);
}
if(filter(*data,"a=MaxBitRate:integer;",&buf)) {
desc->max_bit_rate=atoi(buf);
if (!desc->avg_bit_rate)
desc->avg_bit_rate=desc->max_bit_rate;
handled=1;
*data=nl(*data);
}
if(filter(*data,"a=MaxPacketSize:integer;",&buf)) {
desc->max_packet_size=atoi(buf);
if (!desc->avg_packet_size)
desc->avg_packet_size=desc->max_packet_size;
handled=1;
*data=nl(*data);
}
if(filter(*data,"a=StartTime:integer;",&buf)) {
desc->start_time=atoi(buf);
handled=1;
*data=nl(*data);
}
if(filter(*data,"a=Preroll:integer;",&buf)) {
desc->preroll=atoi(buf);
handled=1;
*data=nl(*data);
}
if(filter(*data,"a=length:npt=",&buf)) {
desc->duration=(uint32_t)(atof(buf)*1000);
handled=1;
*data=nl(*data);
}
if(filter(*data,"a=StreamName:string;",&buf)) {
desc->stream_name=strdup(buf);
desc->stream_name_size=strlen(desc->stream_name);
handled=1;
*data=nl(*data);
}
if(filter(*data,"a=mimetype:string;",&buf)) {
desc->mime_type=strdup(buf);
desc->mime_type_size=strlen(desc->mime_type);
handled=1;
*data=nl(*data);
}
if(filter(*data,"a=OpaqueData:buffer;",&buf)) {
decoded = b64_decode(buf, decoded, &(desc->mlti_data_size));
desc->mlti_data=malloc(sizeof(char)*desc->mlti_data_size);
memcpy(desc->mlti_data, decoded, desc->mlti_data_size);
handled=1;
*data=nl(*data);
#ifdef LOG
printf("mlti_data_size: %i\n", desc->mlti_data_size);
#endif
}
if(filter(*data,"a=ASMRuleBook:string;",&buf)) {
desc->asm_rule_book=strdup(buf);
handled=1;
*data=nl(*data);
}
if(!handled) {
#ifdef LOG
int len=strchr(*data,'\n')-(*data);
buf = xbuffer_copyin(buf, 0, *data, len+1);
buf[len]=0;
printf("libreal: sdpplin: not handled: '%s'\n", buf);
#endif
*data=nl(*data);
}
}
xbuffer_free(buf);
xbuffer_free(decoded);
return desc;
}
sdpplin_t *sdpplin_parse(char *data) {
sdpplin_t *desc=calloc(1,sizeof(sdpplin_t));
sdpplin_stream_t *stream;
char *buf=xbuffer_init(32);
char *decoded=xbuffer_init(32);
int handled;
int len;
while (data && *data) {
handled=0;
if (filter(data, "m=", &buf)) {
stream=sdpplin_parse_stream(&data);
#ifdef LOG
printf("got data for stream id %u\n", stream->stream_id);
#endif
desc->stream[stream->stream_id]=stream;
continue;
}
if(filter(data,"a=Title:buffer;",&buf)) {
decoded=b64_decode(buf, decoded, &len);
desc->title=strdup(decoded);
handled=1;
data=nl(data);
}
if(filter(data,"a=Author:buffer;",&buf)) {
decoded=b64_decode(buf, decoded, &len);
desc->author=strdup(decoded);
handled=1;
data=nl(data);
}
if(filter(data,"a=Copyright:buffer;",&buf)) {
decoded=b64_decode(buf, decoded, &len);
desc->copyright=strdup(decoded);
handled=1;
data=nl(data);
}
if(filter(data,"a=Abstract:buffer;",&buf)) {
decoded=b64_decode(buf, decoded, &len);
desc->abstract=strdup(decoded);
handled=1;
data=nl(data);
}
if(filter(data,"a=StreamCount:integer;",&buf)) {
desc->stream_count=atoi(buf);
desc->stream=malloc(sizeof(sdpplin_stream_t*)*desc->stream_count);
handled=1;
data=nl(data);
}
if(filter(data,"a=Flags:integer;",&buf)) {
desc->flags=atoi(buf);
handled=1;
data=nl(data);
}
if(!handled) {
#ifdef LOG
int len=strchr(data,'\n')-data;
buf = xbuffer_copyin(buf, 0, data, len+1);
buf[len]=0;
printf("libreal: sdpplin: not handled: '%s'\n", buf);
#endif
data=nl(data);
}
}
xbuffer_free(buf);
xbuffer_free(decoded);
return desc;
}
void sdpplin_free(sdpplin_t *description) {
/* TODO: free strings */
free(description);
}