185cc4d095e2e1ebb68372b5210a97de969c8d3d
[vlc.git] / src / input / stream.c
1 /*****************************************************************************
2  * stream.c
3  *****************************************************************************
4  * Copyright (C) 1999-2001 VideoLAN
5  * $Id: stream.c,v 1.3 2003/08/18 19:17:54 fenrir Exp $
6  *
7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8  *
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.
13  *
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.
18  *
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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
22  *****************************************************************************/
23
24 #include <stdlib.h>
25 #include <vlc/vlc.h>
26 #include <vlc/input.h>
27
28 #include "ninput.h"
29
30 /****************************************************************************
31  * stream_* :
32  * XXX for now it's just a wrapper
33  *
34  ****************************************************************************/
35
36 /**
37  * Handle to a stream.
38  */
39 struct stream_t
40 {
41     VLC_COMMON_MEMBERS
42
43     /** pointer to the input thread */
44     input_thread_t *p_input;
45
46 };
47
48 /**
49  * Create a "stream_t *" from an "input_thread_t *".
50  */
51 stream_t    *stream_OpenInput( input_thread_t *p_input )
52 {
53     stream_t *s;
54
55     s = vlc_object_create( p_input, sizeof( stream_t ) );
56     if( s )
57     {
58         s->p_input = p_input;
59     }
60
61     return s;
62 }
63
64 /**
65  * Destroy a previously created "stream_t *" instance.
66  */
67 void        stream_Release( stream_t *s )
68 {
69     vlc_object_destroy( s );
70 }
71
72 /**
73  * Similar to #stream_Control(), but takes a va_list and not variable arguments.
74  */
75 int         stream_vaControl( stream_t *s, int i_query, va_list args )
76 {
77     vlc_bool_t *p_b;
78     int64_t    *p_i64, i64;
79
80     switch( i_query )
81     {
82         case STREAM_GET_SIZE:
83             p_i64 = (int64_t*) va_arg( args, int64_t * );
84
85             vlc_mutex_lock( &s->p_input->stream.stream_lock );
86             *p_i64 = s->p_input->stream.p_selected_area->i_size;
87             vlc_mutex_unlock( &s->p_input->stream.stream_lock );
88             return VLC_SUCCESS;
89
90         case STREAM_CAN_SEEK:
91             p_b = (vlc_bool_t*) va_arg( args, vlc_bool_t * );
92
93             vlc_mutex_lock( &s->p_input->stream.stream_lock );
94             *p_b = s->p_input->stream.b_seekable;
95             vlc_mutex_unlock( &s->p_input->stream.stream_lock );
96             return VLC_SUCCESS;
97
98         case STREAM_CAN_FASTSEEK:
99             p_b = (vlc_bool_t*) va_arg( args, vlc_bool_t * );
100
101             vlc_mutex_lock( &s->p_input->stream.stream_lock );
102             *p_b = s->p_input->stream.b_seekable && s->p_input->stream.i_method == INPUT_METHOD_FILE;
103             vlc_mutex_unlock( &s->p_input->stream.stream_lock );
104             return VLC_SUCCESS;
105
106         case STREAM_GET_POSITION:
107             p_i64 = (int64_t*) va_arg( args, int64_t * );
108
109             vlc_mutex_lock( &s->p_input->stream.stream_lock );
110             *p_i64 = s->p_input->stream.p_selected_area->i_tell;
111             vlc_mutex_unlock( &s->p_input->stream.stream_lock );
112             return VLC_SUCCESS;
113
114         case STREAM_SET_POSITION:
115             i64 = (int64_t) va_arg( args, int64_t );
116
117             vlc_mutex_lock( &s->p_input->stream.stream_lock );
118             if( i64 < 0 ||
119                 ( s->p_input->stream.p_selected_area->i_size > 0 &&
120                   s->p_input->stream.p_selected_area->i_size < i64 ) )
121             {
122                 vlc_mutex_unlock( &s->p_input->stream.stream_lock );
123                 msg_Err( s, "seek out of bound" );
124                 return VLC_EGENERIC;
125             }
126             vlc_mutex_unlock( &s->p_input->stream.stream_lock );
127
128             if( i64 == s->p_input->stream.p_selected_area->i_tell )
129             {
130                 return VLC_SUCCESS;
131             }
132
133             if( s->p_input->stream.b_seekable &&
134                 ( s->p_input->stream.i_method == INPUT_METHOD_FILE ||
135                   i64 - s->p_input->stream.p_selected_area->i_tell < 0 ||
136                   i64 - s->p_input->stream.p_selected_area->i_tell > 4096 ) )
137             {
138                 input_AccessReinit( s->p_input );
139                 s->p_input->pf_seek( s->p_input, i64 );
140                 return VLC_SUCCESS;
141             }
142
143             if( i64 - s->p_input->stream.p_selected_area->i_tell > 0 )
144             {
145                 data_packet_t   *p_data;
146                 int             i_skip = i64 - s->p_input->stream.p_selected_area->i_tell;
147
148                 msg_Warn( s, "will skip %d bytes, slow", i_skip );
149
150                 while (i_skip > 0 )
151                 {
152                     int i_read;
153
154                     i_read = input_SplitBuffer( s->p_input, &p_data,
155                                                 __MIN( (int)s->p_input->i_bufsize, i_skip ) );
156                     if( i_read < 0 )
157                     {
158                         return VLC_EGENERIC;
159                     }
160                     i_skip -= i_read;
161
162                     input_DeletePacket( s->p_input->p_method_data, p_data );
163                     if( i_read == 0 && i_skip > 0 )
164                     {
165                         return VLC_EGENERIC;
166                     }
167                 }
168             }
169
170             return VLC_SUCCESS;
171
172         default:
173             msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
174             return VLC_EGENERIC;
175     }
176 }
177
178 /**
179  * Use to control the "stream_t *". Look at #stream_query_e for
180  * possible "i_query" value and format arguments.  Return VLC_SUCCESS
181  * if ... succeed ;) and VLC_EGENERIC if failed or unimplemented
182  */
183 int         stream_Control( stream_t *s, int i_query, ... )
184 {
185     va_list args;
186     int     i_result;
187
188     va_start( args, i_query );
189     i_result = stream_vaControl( s, i_query, args );
190     va_end( args );
191
192     return i_result;
193 }
194
195 /**
196  * Try to read "i_read" bytes into a buffer pointed by "p_read".  If
197  * "p_read" is NULL then data are skipped instead of read.  The return
198  * value is the real numbers of bytes read/skip. If this value is less
199  * than i_read that means that it's the end of the stream.
200  */
201 int         stream_Read( stream_t *s, void *p_data, int i_data )
202 {
203     uint8_t       *p = (uint8_t*)p_data;
204     data_packet_t *p_packet;
205
206     int i_read = 0;
207
208     if( p_data == NULL && i_data > 0 )
209     {
210         int64_t i_pos;
211
212         stream_Control( s, STREAM_GET_POSITION, &i_pos );
213
214         i_pos += i_data;
215         if( stream_Control( s, STREAM_SET_POSITION, i_pos ) )
216         {
217             return 0;
218         }
219         return i_data;
220     }
221
222     while( i_data > 0 && !s->p_input->b_die )
223     {
224         int i_count;
225
226         i_count = input_SplitBuffer( s->p_input, &p_packet,
227                                      __MIN( i_data, (int)s->p_input->i_bufsize ) );
228         if( i_count <= 0 )
229         {
230             return i_read;
231         }
232
233         if( p )
234         {
235             memcpy( p, p_packet->p_payload_start, i_count );
236             p += i_count;
237         }
238
239         input_DeletePacket( s->p_input->p_method_data, p_packet );
240
241         i_data -= i_count;
242         i_read += i_count;
243     }
244
245     return i_read;
246 }
247
248 /**
249  * Store in pp_peek a pointer to the next "i_peek" bytes in the stream
250  * The return value is the real numbers of valid bytes, if it's less
251  * or equal to 0, *pp_peek is invalid.  XXX: it's a pointer to
252  * internal buffer and it will be invalid as soons as other stream_*
253  * functions are called.  be 0 (then *pp_peek isn't valid).  XXX: due
254  * to input limitation, it could be less than i_peek without meaning
255  * the end of the stream (but only when you have i_peek >=
256  * p_input->i_bufsize)
257  */
258 int         stream_Peek( stream_t *s, uint8_t **pp_peek, int i_data )
259 {
260     return input_Peek( s->p_input, pp_peek, i_data );
261 }
262
263 /**
264  * Read "i_size" bytes and store them in a pes_packet_t.  Only fields
265  * p_first, p_last, i_nb_data, and i_pes_size are set.  (Of course,
266  * you need to fill i_dts, i_pts, ... ) If only less than "i_size"
267  * bytes are available NULL is returned.
268  */
269 pes_packet_t    *stream_PesPacket( stream_t *s, int i_data )
270 {
271     pes_packet_t  *p_pes;
272     data_packet_t *p_packet;
273
274
275     if( !(p_pes = input_NewPES( s->p_input->p_method_data ) ) )
276     {
277         return NULL;
278     }
279
280     if( i_data <= 0 )
281     {
282         p_pes->p_first =
283             p_pes->p_last  =
284                 input_NewPacket( s->p_input->p_method_data, 0 );
285         p_pes->i_nb_data = 1;
286         return p_pes;
287     }
288
289     while( i_data > 0 )
290     {
291         int i_read;
292
293         i_read = input_SplitBuffer( s->p_input, &p_packet,
294                                     __MIN( i_data, (int)s->p_input->i_bufsize ) );
295         if( i_read <= 0 )
296         {
297             /* should occur only with EOF and max allocation reached 
298              * it safer to  return an error */
299             /* free pes */
300             input_DeletePES( s->p_input->p_method_data, p_pes );
301             return NULL;
302         }
303
304         if( p_pes->p_first == NULL )
305         {
306             p_pes->p_first = p_packet;
307         }
308         else
309         {
310             p_pes->p_last->p_next = p_packet;
311         }
312         p_pes->p_last = p_packet;
313         p_pes->i_nb_data++;
314         p_pes->i_pes_size += i_read;
315         i_data            -= i_read;
316     }
317
318     return p_pes;
319 }
320
321 /**
322  * Read i_size into a data_packet_t. If b_force is not set, fewer bytes can
323  * be returned. You should always set b_force, unless you know what you are
324  * doing.
325  */
326 data_packet_t *stream_DataPacket( stream_t *s, int i_size, vlc_bool_t b_force )
327 {
328     data_packet_t *p_pk;
329     int           i_read;
330
331     if( i_size <= 0 )
332     {
333         p_pk = input_NewPacket( s->p_input->p_method_data, 0 );
334         if( p_pk )
335         {
336             p_pk->p_payload_end = p_pk->p_payload_start;
337         }
338         return p_pk;
339     }
340
341     i_read = input_SplitBuffer( s->p_input, &p_pk, i_size );
342     if( i_read <= 0 )
343     {
344         return NULL;
345     }
346
347     /* Should be really rare, near 0 */
348     if( i_read < i_size && b_force )
349     {
350         data_packet_t *p_old = p_pk;
351         int           i_missing = i_size - i_read;
352
353         p_pk = input_NewPacket( s->p_input->p_method_data, i_size );
354         if( p_pk == NULL )
355         {
356             input_DeletePacket( s->p_input->p_method_data, p_old );
357             return NULL;
358         }
359         p_pk->p_payload_end = p_pk->p_payload_start + i_size;
360         memcpy( p_pk->p_payload_start, p_old->p_payload_start, i_read );
361         input_DeletePacket( s->p_input->p_method_data, p_old );
362
363         if( stream_Read( s, &p_pk->p_payload_start[i_read], i_missing ) < i_missing )
364         {
365             input_DeletePacket( s->p_input->p_method_data, p_pk );
366             return NULL;
367         }
368     }
369
370     return p_pk;
371 }
372
373
374