real_sdpplin.c
资源名称:vlc-1.0.5.zip [点击查看]
上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:10k
源码类别:
midi
开发平台:
Unix_Linux
- /*
- * Copyright (C) 2002-2003 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
- *
- * $Id: 64e043af5431f0fed08769a6b62781b0f166cb7a $
- *
- * sdp/sdpplin parser.
- *
- */
- #include "real.h"
- #define BUFLEN 32000
- /*
- * 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,k;
- unsigned int j;
- for( i = 0; i < 256; 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*/
- int in_len = strlen(in);
- for (j=0; j < in_len; j+=4) {
- char a[4], b[4];
- for (i = 0; i < 4 && j + i < in_len; i++) {
- int c = in[i+j];
- if (dtable[c] & 0x80) {
- printf("Illegal character '%c' in input.n", c);
- exit(1);
- }
- a[i] = (char) c;
- b[i] = (char) dtable[c];
- }
- //xine_buffer_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, size_t outlen) {
- int flen=strlen(filter);
- size_t len;
- if (!in) return 0;
- len = (strchr(in,'n')) ? (size_t)(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--;
- if( len-flen+1 > outlen )
- {
- printf("Discarding end of string to avoid overflow");
- len=outlen+flen-1;
- }
- memcpy(*out, 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;
- char* buf = NULL;
- char* decoded = NULL;
- int handled;
- desc = calloc( 1, sizeof(sdpplin_stream_t) );
- if( !desc )
- return NULL;
- buf = malloc( BUFLEN );
- if( !buf )
- goto error;
- decoded = malloc( BUFLEN );
- if( !decoded )
- goto error;
- if (filter(*data, "m=", &buf, BUFLEN)) {
- desc->id = strdup(buf);
- } else {
- lprintf("sdpplin: no m= found.n");
- goto error;
- }
- *data=nl(*data);
- while (*data && **data && *data[0]!='m') {
- handled=0;
- if(filter(*data,"a=control:streamid=",&buf, BUFLEN)) {
- /* This way negative values are mapped to unfeasibly high
- * values, and will be discarded afterward
- */
- unsigned long tmp = strtoul(buf, NULL, 10);
- if ( tmp > UINT16_MAX )
- lprintf("stream id out of bound: %lun", tmp);
- else
- desc->stream_id=tmp;
- handled=1;
- *data=nl(*data);
- }
- if(filter(*data,"a=MaxBitRate:integer;",&buf, BUFLEN)) {
- 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, BUFLEN)) {
- 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, BUFLEN)) {
- desc->start_time=atoi(buf);
- handled=1;
- *data=nl(*data);
- }
- if(filter(*data,"a=Preroll:integer;",&buf, BUFLEN)) {
- desc->preroll=atoi(buf);
- handled=1;
- *data=nl(*data);
- }
- if(filter(*data,"a=length:npt=",&buf, BUFLEN)) {
- desc->duration=(uint32_t)(atof(buf)*1000);
- handled=1;
- *data=nl(*data);
- }
- if(filter(*data,"a=StreamName:string;",&buf, BUFLEN)) {
- 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, BUFLEN)) {
- 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, BUFLEN)) {
- decoded = b64_decode(buf, decoded, &(desc->mlti_data_size));
- if ( decoded != NULL ) {
- desc->mlti_data = malloc(desc->mlti_data_size);
- memcpy(desc->mlti_data, decoded, desc->mlti_data_size);
- handled=1;
- *data=nl(*data);
- lprintf("mlti_data_size: %in", desc->mlti_data_size);
- }
- }
- if(filter(*data,"a=ASMRuleBook:string;",&buf, BUFLEN)) {
- desc->asm_rule_book=strdup(buf);
- handled=1;
- *data=nl(*data);
- }
- if(!handled) {
- #ifdef LOG
- int len=strchr(*data,'n')-(*data);
- memcpy(buf, *data, len+1);
- buf[len]=0;
- printf("libreal: sdpplin: not handled: '%s'n", buf);
- #endif
- *data=nl(*data);
- }
- }
- free( buf );
- free( decoded) ;
- return desc;
- error:
- free( decoded );
- free( desc );
- free( buf );
- return NULL;
- }
- sdpplin_t *sdpplin_parse(char *data)
- {
- sdpplin_t* desc;
- sdpplin_stream_t* stream;
- char* buf;
- char* decoded;
- int handled;
- int len;
- desc = calloc( 1, sizeof(sdpplin_t) );
- if( !desc )
- return NULL;
- buf = malloc( BUFLEN );
- if( !buf )
- {
- free( desc );
- return NULL;
- }
- decoded = malloc( BUFLEN );
- if( !decoded )
- {
- free( buf );
- free( desc );
- return NULL;
- }
- desc->stream = NULL;
- while (data && *data) {
- handled=0;
- if (filter(data, "m=", &buf, BUFLEN)) {
- if ( !desc->stream ) {
- fprintf(stderr, "sdpplin.c: stream identifier found before stream count, skipping.");
- continue;
- }
- stream=sdpplin_parse_stream(&data);
- lprintf("got data for stream id %un", stream->stream_id);
- if ( stream->stream_id >= desc->stream_count )
- lprintf("stream id %u is greater than stream count %un", stream->stream_id, desc->stream_count);
- else
- desc->stream[stream->stream_id]=stream;
- continue;
- }
- if(filter(data,"a=Title:buffer;",&buf, BUFLEN)) {
- decoded=b64_decode(buf, decoded, &len);
- if ( decoded != NULL ) {
- desc->title=strdup(decoded);
- handled=1;
- data=nl(data);
- }
- }
- if(filter(data,"a=Author:buffer;",&buf, BUFLEN)) {
- decoded=b64_decode(buf, decoded, &len);
- if ( decoded != NULL ) {
- desc->author=strdup(decoded);
- handled=1;
- data=nl(data);
- }
- }
- if(filter(data,"a=Copyright:buffer;",&buf, BUFLEN)) {
- decoded=b64_decode(buf, decoded, &len);
- if ( decoded != NULL ) {
- desc->copyright=strdup(decoded);
- handled=1;
- data=nl(data);
- }
- }
- if(filter(data,"a=Abstract:buffer;",&buf, BUFLEN)) {
- decoded=b64_decode(buf, decoded, &len);
- if ( decoded != NULL ) {
- desc->abstract=strdup(decoded);
- handled=1;
- data=nl(data);
- }
- }
- if(filter(data,"a=StreamCount:integer;",&buf, BUFLEN)) {
- /* This way negative values are mapped to unfeasibly high
- * values, and will be discarded afterward
- */
- unsigned long tmp = strtoul(buf, NULL, 10);
- if ( tmp > UINT16_MAX )
- lprintf("stream count out of bound: %lun", tmp);
- else
- desc->stream_count = tmp;
- desc->stream = malloc(sizeof(sdpplin_stream_t*)*desc->stream_count);
- handled=1;
- data=nl(data);
- }
- if(filter(data,"a=Flags:integer;",&buf, BUFLEN)) {
- desc->flags=atoi(buf);
- handled=1;
- data=nl(data);
- }
- if(!handled) {
- #ifdef LOG
- int len=strchr(data,'n')-data;
- memcpy(buf, data, len+1);
- buf[len]=0;
- printf("libreal: sdpplin: not handled: '%s'n", buf);
- #endif
- data=nl(data);
- }
- }
- free( decoded );
- free( buf );
- return desc;
- }
- void sdpplin_free(sdpplin_t *description) {
- int i;
- if( !description ) return;
- for( i=0; i<description->stream_count; i++ ) {
- if( description->stream[i] ) {
- free( description->stream[i]->id );
- free( description->stream[i]->bandwidth );
- free( description->stream[i]->range );
- free( description->stream[i]->length );
- free( description->stream[i]->rtpmap );
- free( description->stream[i]->mimetype );
- free( description->stream[i]->stream_name );
- free( description->stream[i]->mime_type );
- free( description->stream[i]->mlti_data );
- free( description->stream[i]->rmff_flags );
- free( description->stream[i]->asm_rule_book );
- free( description->stream[i] );
- }
- }
- if( description->stream_count )
- free( description->stream );
- free( description->owner );
- free( description->session_name );
- free( description->session_info );
- free( description->uri );
- free( description->email );
- free( description->phone );
- free( description->connection );
- free( description->bandwidth );
- free( description->title );
- free( description->author );
- free( description->copyright );
- free( description->keywords );
- free( description->asm_rule_book );
- free( description->abstract );
- free( description->range );
- free( description );
- }