real_sdpplin.c 8.47 KB
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/*
 * 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: sdpplin.c,v 1.5 2004/04/23 21:59:04 miguelfreitas Exp $
 *
 * sdp/sdpplin parser.
 *
 */
 
#include "real.h"

/*
 * Decodes base64 strings (based upon b64 package)
 */

static char *b64_decode(const char *in, char *out, int *size)
{
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    char dtable[256];              /* Encode / decode table */
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    int i,k;
    unsigned int j;
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    for (i = 0; i < 255; i++) {
        dtable[i] = 0x80;
    }
    for (i = 'A'; i <= 'Z'; i++) {
        dtable[i] = 0 + (i - 'A');
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    }
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    for (i = 'a'; i <= 'z'; i++) {
        dtable[i] = 26 + (i - 'a');
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    }
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    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);
            }
            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;
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}

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static char *nl(char *data)
{
    char *nlptr = (data) ? strchr(data,'\n') : NULL;
    return (nlptr) ? nlptr + 1 : NULL;
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}

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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--;
        memcpy(*out, in+flen, len-flen+1);
        (*out)[len-flen]=0;
        return len-flen;
    }
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    return 0;
}

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static sdpplin_stream_t *sdpplin_parse_stream(char **data)
{
    sdpplin_stream_t *desc = malloc(sizeof(sdpplin_stream_t));
    char      *buf = malloc(32000);
    char      *decoded = malloc(32000);
    int       handled;
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    if( !desc ) return NULL;
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    memset(desc, 0, sizeof(sdpplin_stream_t));
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    if( !buf ) goto error;
    if( !decoded ) goto error;

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    if (filter(*data, "m=", &buf))
    {
        desc->id = strdup(buf);
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    }
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    else
    {
        lprintf("sdpplin: no m= found.\n");
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        goto error;
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    }
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    *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);
            lprintf("mlti_data_size: %i\n", desc->mlti_data_size);
        }
        if(filter(*data,"a=ASMRuleBook:string;",&buf))
        {
            desc->asm_rule_book=strdup(buf);
            handled=1;
            *data=nl(*data);
        }

        if(!handled)
        {
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#ifdef LOG
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            int len=strchr(*data,'\n')-(*data);
            memcpy(buf, *data, len+1);
            buf[len]=0;
            printf("libreal: sdpplin: not handled: '%s'\n", buf);
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#endif
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            *data=nl(*data);
        }
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    }
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    if( buf ) free(buf);
    if( decoded )free(decoded);
    return desc;
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error:
    if( decoded ) free(decoded);
    if( desc ) free( desc );
    if( buf ) free( buf );
    return NULL;
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}

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sdpplin_t *sdpplin_parse(char *data)
{
    sdpplin_t        *desc = malloc(sizeof(sdpplin_t));
    sdpplin_stream_t *stream;
    char             *buf=malloc(3200);
    char             *decoded=malloc(3200);
    int              handled;
    int              len;

    if( !desc ) return NULL;
    if( !buf )
    {
        free( desc );
        return NULL;
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    }
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    if( !decoded )
    {
        free( buf );
        free( desc );
        return NULL;
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    }
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    memset(desc, 0, sizeof(sdpplin_t));

    while (data && *data)
    {
        handled=0;

        if (filter(data, "m=", &buf))
        {
            stream=sdpplin_parse_stream(&data);
            lprintf("got data for stream id %u\n", stream->stream_id);
            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)
        {
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#ifdef LOG
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            int len=strchr(data,'\n')-data;
            memcpy(buf, data, len+1);
            buf[len]=0;
        printf("libreal: sdpplin: not handled: '%s'\n", buf);
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#endif
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            data=nl(data);
        }
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    }

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    free(decoded);
    free(buf);
    return desc;
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}

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void sdpplin_free(sdpplin_t *description)
{
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  /* TODO: free strings */
  free(description);
}