* stream: less warnings.
[vlc.git] / src / input / stream.c
1 /*****************************************************************************
2  * stream.c
3  *****************************************************************************
4  * Copyright (C) 1999-2001 VideoLAN
5  * $Id: stream.c,v 1.4 2003/08/20 01:18:50 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                 if( i_skip > 1000 )
149                 {
150                     msg_Warn( s, "will skip %d bytes, slow", i_skip );
151                 }
152
153                 while (i_skip > 0 )
154                 {
155                     int i_read;
156
157                     i_read = input_SplitBuffer( s->p_input, &p_data,
158                                                 __MIN( (int)s->p_input->i_bufsize, i_skip ) );
159                     if( i_read < 0 )
160                     {
161                         return VLC_EGENERIC;
162                     }
163                     i_skip -= i_read;
164
165                     input_DeletePacket( s->p_input->p_method_data, p_data );
166                     if( i_read == 0 && i_skip > 0 )
167                     {
168                         return VLC_EGENERIC;
169                     }
170                 }
171             }
172
173             return VLC_SUCCESS;
174
175         default:
176             msg_Err( s, "invalid stream_vaControl query=0x%x", i_query );
177             return VLC_EGENERIC;
178     }
179 }
180
181 /**
182  * Use to control the "stream_t *". Look at #stream_query_e for
183  * possible "i_query" value and format arguments.  Return VLC_SUCCESS
184  * if ... succeed ;) and VLC_EGENERIC if failed or unimplemented
185  */
186 int         stream_Control( stream_t *s, int i_query, ... )
187 {
188     va_list args;
189     int     i_result;
190
191     va_start( args, i_query );
192     i_result = stream_vaControl( s, i_query, args );
193     va_end( args );
194
195     return i_result;
196 }
197
198 /**
199  * Try to read "i_read" bytes into a buffer pointed by "p_read".  If
200  * "p_read" is NULL then data are skipped instead of read.  The return
201  * value is the real numbers of bytes read/skip. If this value is less
202  * than i_read that means that it's the end of the stream.
203  */
204 int         stream_Read( stream_t *s, void *p_data, int i_data )
205 {
206     uint8_t       *p = (uint8_t*)p_data;
207     data_packet_t *p_packet;
208
209     int i_read = 0;
210
211     if( p_data == NULL && i_data > 0 )
212     {
213         int64_t i_pos;
214
215         stream_Control( s, STREAM_GET_POSITION, &i_pos );
216
217         i_pos += i_data;
218         if( stream_Control( s, STREAM_SET_POSITION, i_pos ) )
219         {
220             return 0;
221         }
222         return i_data;
223     }
224
225     while( i_data > 0 && !s->p_input->b_die )
226     {
227         int i_count;
228
229         i_count = input_SplitBuffer( s->p_input, &p_packet,
230                                      __MIN( i_data, (int)s->p_input->i_bufsize ) );
231         if( i_count <= 0 )
232         {
233             return i_read;
234         }
235
236         if( p )
237         {
238             memcpy( p, p_packet->p_payload_start, i_count );
239             p += i_count;
240         }
241
242         input_DeletePacket( s->p_input->p_method_data, p_packet );
243
244         i_data -= i_count;
245         i_read += i_count;
246     }
247
248     return i_read;
249 }
250
251 /**
252  * Store in pp_peek a pointer to the next "i_peek" bytes in the stream
253  * The return value is the real numbers of valid bytes, if it's less
254  * or equal to 0, *pp_peek is invalid.  XXX: it's a pointer to
255  * internal buffer and it will be invalid as soons as other stream_*
256  * functions are called.  be 0 (then *pp_peek isn't valid).  XXX: due
257  * to input limitation, it could be less than i_peek without meaning
258  * the end of the stream (but only when you have i_peek >=
259  * p_input->i_bufsize)
260  */
261 int         stream_Peek( stream_t *s, uint8_t **pp_peek, int i_data )
262 {
263     return input_Peek( s->p_input, pp_peek, i_data );
264 }
265
266 /**
267  * Read "i_size" bytes and store them in a pes_packet_t.  Only fields
268  * p_first, p_last, i_nb_data, and i_pes_size are set.  (Of course,
269  * you need to fill i_dts, i_pts, ... ) If only less than "i_size"
270  * bytes are available NULL is returned.
271  */
272 pes_packet_t    *stream_PesPacket( stream_t *s, int i_data )
273 {
274     pes_packet_t  *p_pes;
275     data_packet_t *p_packet;
276
277
278     if( !(p_pes = input_NewPES( s->p_input->p_method_data ) ) )
279     {
280         return NULL;
281     }
282
283     if( i_data <= 0 )
284     {
285         p_pes->p_first =
286             p_pes->p_last  =
287                 input_NewPacket( s->p_input->p_method_data, 0 );
288         p_pes->i_nb_data = 1;
289         return p_pes;
290     }
291
292     while( i_data > 0 )
293     {
294         int i_read;
295
296         i_read = input_SplitBuffer( s->p_input, &p_packet,
297                                     __MIN( i_data, (int)s->p_input->i_bufsize ) );
298         if( i_read <= 0 )
299         {
300             /* should occur only with EOF and max allocation reached 
301              * it safer to  return an error */
302             /* free pes */
303             input_DeletePES( s->p_input->p_method_data, p_pes );
304             return NULL;
305         }
306
307         if( p_pes->p_first == NULL )
308         {
309             p_pes->p_first = p_packet;
310         }
311         else
312         {
313             p_pes->p_last->p_next = p_packet;
314         }
315         p_pes->p_last = p_packet;
316         p_pes->i_nb_data++;
317         p_pes->i_pes_size += i_read;
318         i_data            -= i_read;
319     }
320
321     return p_pes;
322 }
323
324 /**
325  * Read i_size into a data_packet_t. If b_force is not set, fewer bytes can
326  * be returned. You should always set b_force, unless you know what you are
327  * doing.
328  */
329 data_packet_t *stream_DataPacket( stream_t *s, int i_size, vlc_bool_t b_force )
330 {
331     data_packet_t *p_pk;
332     int           i_read;
333
334     if( i_size <= 0 )
335     {
336         p_pk = input_NewPacket( s->p_input->p_method_data, 0 );
337         if( p_pk )
338         {
339             p_pk->p_payload_end = p_pk->p_payload_start;
340         }
341         return p_pk;
342     }
343
344     i_read = input_SplitBuffer( s->p_input, &p_pk, i_size );
345     if( i_read <= 0 )
346     {
347         return NULL;
348     }
349
350     /* Should be really rare, near 0 */
351     if( i_read < i_size && b_force )
352     {
353         data_packet_t *p_old = p_pk;
354         int           i_missing = i_size - i_read;
355
356         p_pk = input_NewPacket( s->p_input->p_method_data, i_size );
357         if( p_pk == NULL )
358         {
359             input_DeletePacket( s->p_input->p_method_data, p_old );
360             return NULL;
361         }
362         p_pk->p_payload_end = p_pk->p_payload_start + i_size;
363         memcpy( p_pk->p_payload_start, p_old->p_payload_start, i_read );
364         input_DeletePacket( s->p_input->p_method_data, p_old );
365
366         if( stream_Read( s, &p_pk->p_payload_start[i_read], i_missing ) < i_missing )
367         {
368             input_DeletePacket( s->p_input->p_method_data, p_pk );
369             return NULL;
370         }
371     }
372
373     return p_pk;
374 }
375
376
377