1 /*****************************************************************************
2 * asf.c: MMS access plug-in
3 *****************************************************************************
4 * Copyright (C) 2001-2004 the VideoLAN team
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
29 static int CmpGuid( const guid_t *p_guid1, const guid_t *p_guid2 )
31 return( ( p_guid1->v1 == p_guid2->v1 &&
32 p_guid1->v2 == p_guid2->v2 &&
33 p_guid1->v3 == p_guid2->v3 &&
34 p_guid1->v4[0] == p_guid2->v4[0] &&
35 p_guid1->v4[1] == p_guid2->v4[1] &&
36 p_guid1->v4[2] == p_guid2->v4[2] &&
37 p_guid1->v4[3] == p_guid2->v4[3] &&
38 p_guid1->v4[4] == p_guid2->v4[4] &&
39 p_guid1->v4[5] == p_guid2->v4[5] &&
40 p_guid1->v4[6] == p_guid2->v4[6] &&
41 p_guid1->v4[7] == p_guid2->v4[7] ) ? 1 : 0 );
44 void E_( GenerateGuid )( guid_t *p_guid )
48 srand( mdate() & 0xffffffff );
50 /* FIXME should be generated using random data */
51 p_guid->v1 = 0xbabac001;
52 p_guid->v2 = ( (uint64_t)rand() << 16 ) / RAND_MAX;
53 p_guid->v3 = ( (uint64_t)rand() << 16 ) / RAND_MAX;
54 for( i = 0; i < 8; i++ )
56 p_guid->v4[i] = ( (uint64_t)rand() * 256 ) / RAND_MAX;
60 void E_( asf_HeaderParse )( asf_header_t *hdr,
61 uint8_t *p_header, int i_header )
69 hdr->i_data_packets_count = 0;
70 hdr->i_min_data_packet_size = 0;
71 for( i = 0; i < 128; i++ )
73 hdr->stream[i].i_cat = ASF_STREAM_UNKNOWN;
74 hdr->stream[i].i_selected = 0;
75 hdr->stream[i].i_bitrate = -1;
78 var_buffer_initread( &buffer, p_header, i_header );
79 var_buffer_getguid( &buffer, &guid );
81 if( !CmpGuid( &guid, &asf_object_header_guid ) )
85 var_buffer_getmemory( &buffer, NULL, 30 - 16 );
89 var_buffer_getguid( &buffer, &guid );
90 i_size = var_buffer_get64( &buffer );
92 if( CmpGuid( &guid, &asf_object_file_properties_guid ) )
94 var_buffer_getmemory( &buffer, NULL, 16 );
95 hdr->i_file_size = var_buffer_get64( &buffer );
96 var_buffer_getmemory( &buffer, NULL, 8 );
97 hdr->i_data_packets_count = var_buffer_get64( &buffer );
98 var_buffer_getmemory( &buffer, NULL, 8+8+8+4);
99 hdr->i_min_data_packet_size = var_buffer_get32( &buffer );
101 var_buffer_getmemory( &buffer, NULL, i_size - 24 - 16 - 8 - 8 - 8 - 8-8-8-4 - 4);
103 else if( CmpGuid( &guid, &asf_object_header_extension_guid ) )
106 var_buffer_getmemory( &buffer, NULL, 46 - 24 );
108 else if( CmpGuid( &guid, &asf_object_extended_stream_properties_guid ) )
111 int16_t i_count1, i_count2;
115 var_buffer_getmemory( &buffer, NULL, 84 - 24 );
117 i_count1 = var_buffer_get16( &buffer );
118 i_count2 = var_buffer_get16( &buffer );
121 for( i = 0; i < i_count1; i++ )
125 var_buffer_get16( &buffer );
126 i_len = var_buffer_get16( &buffer );
127 var_buffer_getmemory( &buffer, NULL, i_len );
129 i_subsize = 4 + i_len;
132 for( i = 0; i < i_count2; i++ )
135 var_buffer_getmemory( &buffer, NULL, 16 + 2 );
136 i_len = var_buffer_get32( &buffer );
137 var_buffer_getmemory( &buffer, NULL, i_len );
139 i_subsize += 16 + 6 + i_len;
142 if( i_size - i_subsize <= 24 )
144 var_buffer_getmemory( &buffer, NULL, i_size - i_subsize );
146 /* It's a hack we just skip the first part of the object until
147 * the embed stream properties if any (ugly, but whose fault ?) */
149 else if( CmpGuid( &guid, &asf_object_stream_properties_guid ) )
154 var_buffer_getguid( &buffer, &stream_type );
155 var_buffer_getmemory( &buffer, NULL, 32 );
157 i_stream_id = var_buffer_get8( &buffer ) & 0x7f;
158 var_buffer_getmemory( &buffer, NULL, i_size - 24 - 32 - 16 - 1);
160 if( CmpGuid( &stream_type, &asf_object_stream_type_video ) )
162 hdr->stream[i_stream_id].i_cat = ASF_STREAM_VIDEO;
164 else if( CmpGuid( &stream_type, &asf_object_stream_type_audio ) )
166 hdr->stream[i_stream_id].i_cat = ASF_STREAM_AUDIO;
170 hdr->stream[i_stream_id].i_cat = ASF_STREAM_UNKNOWN;
173 else if ( CmpGuid( &guid, &asf_object_bitrate_properties_guid ) )
178 i_count = var_buffer_get16( &buffer );
182 i_stream_id = var_buffer_get16( &buffer )&0x7f;
183 hdr->stream[i_stream_id].i_bitrate = var_buffer_get32( &buffer );
187 var_buffer_getmemory( &buffer, NULL, i_size - 24 );
192 var_buffer_getmemory( &buffer, NULL, i_size - 24 );
195 if( var_buffer_readempty( &buffer ) )
200 void E_( asf_StreamSelect ) ( asf_header_t *hdr,
202 vlc_bool_t b_all, vlc_bool_t b_audio, vlc_bool_t b_video )
204 /* XXX FIXME use mututal eclusion information */
206 int i_audio, i_video;
217 /* select all valid stream */
218 for( i = 1; i < 128; i++ )
220 if( hdr->stream[i].i_cat != ASF_STREAM_UNKNOWN )
222 hdr->stream[i].i_selected = 1;
229 for( i = 0; i < 128; i++ )
231 /* by default, not selected */
232 hdr->stream[i].i_selected = 0;
238 * - no audio nor video stream
240 * - if i_bitrate_max not set keep the highest bitrate
241 * - if i_bitrate_max is set, keep stream that make we used best
242 * quality regarding i_bitrate_max
245 * - it doesn't use mutual exclusion info..
246 * - when selecting a better stream we could select
247 * something that make i_bitrate_total> i_bitrate_max
249 for( i = 1; i < 128; i++ )
251 if( hdr->stream[i].i_cat == ASF_STREAM_UNKNOWN )
255 else if( hdr->stream[i].i_cat == ASF_STREAM_AUDIO && b_audio &&
257 ( ( ( hdr->stream[i].i_bitrate > hdr->stream[i_audio].i_bitrate &&
258 ( i_bitrate_total + hdr->stream[i].i_bitrate - hdr->stream[i_audio].i_bitrate
259 < i_bitrate_max || !i_bitrate_max) ) ||
260 ( hdr->stream[i].i_bitrate < hdr->stream[i_audio].i_bitrate &&
261 i_bitrate_max != 0 && i_bitrate_total > i_bitrate_max )
264 /* unselect old stream */
267 hdr->stream[i_audio].i_selected = 0;
268 if( hdr->stream[i_audio].i_bitrate> 0 )
270 i_bitrate_total -= hdr->stream[i_audio].i_bitrate;
274 hdr->stream[i].i_selected = 1;
275 if( hdr->stream[i].i_bitrate> 0 )
277 i_bitrate_total += hdr->stream[i].i_bitrate;
281 else if( hdr->stream[i].i_cat == ASF_STREAM_VIDEO && b_video &&
284 ( ( hdr->stream[i].i_bitrate > hdr->stream[i_video].i_bitrate &&
285 ( i_bitrate_total + hdr->stream[i].i_bitrate - hdr->stream[i_video].i_bitrate
286 < i_bitrate_max || !i_bitrate_max) ) ||
287 ( hdr->stream[i].i_bitrate < hdr->stream[i_video].i_bitrate &&
288 i_bitrate_max != 0 && i_bitrate_total > i_bitrate_max )
291 /* unselect old stream */
294 hdr->stream[i_video].i_selected = 0;
295 if( hdr->stream[i_video].i_bitrate> 0 )
297 i_bitrate_total -= hdr->stream[i_video].i_bitrate;
301 hdr->stream[i].i_selected = 1;
302 if( hdr->stream[i].i_bitrate> 0 )
304 i_bitrate_total += hdr->stream[i].i_bitrate;