1 /*****************************************************************************
2 * input_netlist.c: netlist management
3 *****************************************************************************
4 * Copyright (C) 1998, 1999, 2000 VideoLAN
5 * $Id: input_netlist.c,v 1.36 2001/05/06 04:32:02 sam Exp $
7 * Authors: Henri Fallon <henri@videolan.org>
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
30 #include <string.h> /* memcpy(), memset() */
31 #include <sys/types.h>
35 # include <sys/uio.h> /* struct iovec */
39 void *iov_base; /* Pointer to data. */
40 size_t iov_len; /* Length of data. */
46 #include "threads.h" /* mutex */
48 #include "intf_msg.h" /* intf_*Msg */
50 #include "stream_control.h"
51 #include "input_ext-intf.h"
52 #include "input_ext-dec.h"
55 #include "input_netlist.h"
57 /*****************************************************************************
58 * input_NetlistInit: allocates netlist buffers and init indexes
59 *****************************************************************************/
60 int input_NetlistInit( input_thread_t * p_input, int i_nb_data, int i_nb_pes,
61 size_t i_buffer_size, int i_read_once )
64 netlist_t * p_netlist;
66 /* First we allocate and initialise our netlist struct */
67 p_input->p_method_data = malloc(sizeof(netlist_t));
68 if ( p_input->p_method_data == NULL )
70 intf_ErrMsg("Unable to malloc the netlist struct");
74 p_netlist = (netlist_t *) p_input->p_method_data;
76 p_netlist->i_read_once = i_read_once;
78 /* In order to optimize netlist, we are taking i_nb_data a 2^i
79 * so that modulo is an "&".
80 * This is not changing i_nb data outside this function except in
81 * the netlist_t struct */
82 /* As i_loop is unsigned int, and i_ns_data int, this shouldn't be a
84 for( i_loop=1; i_loop < i_nb_data; i_loop*=2 )
86 intf_DbgMsg( "Netlist : Required %i byte, got %u",i_nb_data,i_loop );
89 /* Same thing for i_nb_pes */
90 for( i_loop=1; i_loop < i_nb_data; i_loop*=2 )
92 intf_DbgMsg( "Netlist : Required %i byte, got %u",i_nb_data,i_loop );
95 /* allocate the buffers */
96 p_netlist->p_buffers =
97 (byte_t *) malloc(i_buffer_size* i_nb_data );
98 if ( p_netlist->p_buffers == NULL )
100 intf_ErrMsg ("Unable to malloc in netlist initialization (1)");
105 (data_packet_t *) malloc(sizeof(data_packet_t)*(i_nb_data));
106 if ( p_netlist->p_data == NULL )
108 intf_ErrMsg ("Unable to malloc in netlist initialization (2)");
113 (pes_packet_t *) malloc(sizeof(pes_packet_t)*(i_nb_pes));
114 if ( p_netlist->p_pes == NULL )
116 intf_ErrMsg ("Unable to malloc in netlist initialization (3)");
120 /* allocate the FIFOs */
121 p_netlist->pp_free_data =
122 (data_packet_t **) malloc (i_nb_data * sizeof(data_packet_t *) );
123 if ( p_netlist->pp_free_data == NULL )
125 intf_ErrMsg ("Unable to malloc in netlist initialization (4)");
127 p_netlist->pp_free_pes =
128 (pes_packet_t **) malloc (i_nb_pes * sizeof(pes_packet_t *) );
129 if ( p_netlist->pp_free_pes == NULL )
131 intf_ErrMsg ("Unable to malloc in netlist initialization (5)");
134 p_netlist->p_free_iovec = ( struct iovec * )
135 malloc( (i_nb_data + p_netlist->i_read_once) * sizeof(struct iovec) );
136 if ( p_netlist->p_free_iovec == NULL )
138 intf_ErrMsg ("Unable to malloc in netlist initialization (6)");
141 /* Fill the data FIFO */
142 for ( i_loop = 0; i_loop < i_nb_data; i_loop++ )
144 p_netlist->pp_free_data[i_loop] =
145 p_netlist->p_data + i_loop;
147 p_netlist->pp_free_data[i_loop]->p_buffer =
148 p_netlist->p_buffers + i_loop * i_buffer_size;
150 p_netlist->pp_free_data[i_loop]->p_payload_start =
151 p_netlist->pp_free_data[i_loop]->p_buffer;
153 p_netlist->pp_free_data[i_loop]->p_payload_end =
154 p_netlist->pp_free_data[i_loop]->p_buffer + i_buffer_size;
156 /* Fill the PES FIFO */
157 for ( i_loop = 0; i_loop < i_nb_pes ; i_loop++ )
159 p_netlist->pp_free_pes[i_loop] =
160 p_netlist->p_pes + i_loop;
163 /* Deal with the iovec */
164 for ( i_loop = 0; i_loop < i_nb_data; i_loop++ )
166 p_netlist->p_free_iovec[i_loop].iov_base =
167 p_netlist->p_buffers + i_loop * i_buffer_size;
169 p_netlist->p_free_iovec[i_loop].iov_len = i_buffer_size;
173 vlc_mutex_init (&p_netlist->lock);
175 /* initialize indexes */
176 p_netlist->i_data_start = 0;
177 p_netlist->i_data_end = i_nb_data - 1;
179 p_netlist->i_pes_start = 0;
180 p_netlist->i_pes_end = i_nb_pes - 1;
182 p_netlist->i_nb_data = i_nb_data;
183 p_netlist->i_nb_pes = i_nb_pes;
184 p_netlist->i_buffer_size = i_buffer_size;
186 return (0); /* Everything went all right */
189 /*****************************************************************************
190 * input_NetlistGetiovec: returns an iovec pointer for a readv() operation
191 *****************************************************************************
192 * We return an iovec vector, so that readv can read many packets at a time,
193 * and we set pp_data to direct to the fifo pointer, which will allow us
194 * to get the corresponding data_packet.
195 *****************************************************************************/
196 struct iovec * input_NetlistGetiovec( void * p_method_data )
198 netlist_t * p_netlist;
201 p_netlist = ( netlist_t * ) p_method_data;
205 ( (p_netlist->i_data_end - p_netlist->i_data_start + p_netlist->i_nb_data)
206 & ( p_netlist->i_nb_data -1 ) ) < p_netlist->i_read_once )
208 intf_ErrMsg("Empty iovec FIFO. Unable to allocate memory");
212 /* readv only takes contiguous buffers
213 * so, as a solution, we chose to have a FIFO a bit longer
214 * than i_nb_data, and copy the begining of the FIFO to its end
215 * if the readv needs to go after the end */
216 if( p_netlist->i_nb_data - p_netlist->i_data_start <
217 p_netlist->i_read_once )
219 memcpy( &p_netlist->p_free_iovec[p_netlist->i_nb_data],
220 p_netlist->p_free_iovec,
221 (p_netlist->i_read_once-
222 (p_netlist->i_nb_data-p_netlist->i_data_start))
223 * sizeof(struct iovec)
228 return &p_netlist->p_free_iovec[p_netlist->i_data_start];
232 /*****************************************************************************
233 * input_NetlistMviovec: move the iovec pointer after a readv() operation
234 *****************************************************************************/
235 void input_NetlistMviovec( void * p_method_data, size_t i_nb_iovec,
236 struct data_packet_s * pp_packets[INPUT_READ_ONCE] )
238 netlist_t * p_netlist;
239 unsigned int i_loop = 0;
240 unsigned int i_current;
243 p_netlist = (netlist_t *) p_method_data;
246 vlc_mutex_lock ( &p_netlist->lock );
248 i_current = p_netlist->i_data_start;
251 /* Fills a table of pointers to packets associated with the io_vec's */
252 while (i_loop < i_nb_iovec )
254 if( i_current >= p_netlist->i_nb_data )
255 i_current-=p_netlist->i_nb_data;
257 pp_packets[i_loop] = p_netlist->pp_free_data[i_current];
258 pp_packets[i_loop]->b_discard_payload = 0;
264 p_netlist->i_data_start += i_nb_iovec;
265 p_netlist->i_data_start &= ( p_netlist->i_nb_data - 1 );
268 vlc_mutex_unlock (&p_netlist->lock);
272 /*****************************************************************************
273 * input_NetlistNewPacket: returns a free data_packet_t
274 *****************************************************************************/
275 struct data_packet_s * input_NetlistNewPacket( void * p_method_data,
276 size_t i_buffer_size )
278 netlist_t * p_netlist;
279 struct data_packet_s * p_return;
282 p_netlist = ( netlist_t * ) p_method_data;
285 if( i_buffer_size > p_netlist->i_buffer_size )
287 /* This should not happen */
288 intf_ErrMsg( "Netlist packet too small !" );
294 vlc_mutex_lock ( &p_netlist->lock );
297 if ( p_netlist->i_data_start == p_netlist->i_data_end )
299 intf_ErrMsg("Empty Data FIFO in netlist. Unable to allocate memory");
303 p_return = p_netlist->pp_free_data[p_netlist->i_data_start];
304 p_netlist->i_data_start++;
305 p_netlist->i_data_start &= ( p_netlist->i_nb_data - 1 );
308 vlc_mutex_unlock (&p_netlist->lock);
311 /* initialize data */
312 p_return->p_next = NULL;
313 p_return->b_discard_payload = 0;
315 p_return->p_payload_start = p_return->p_buffer;
316 p_return->p_payload_end = p_return->p_payload_start + i_buffer_size;
321 /*****************************************************************************
322 * input_NetlistNewPES: returns a free pes_packet_t
323 *****************************************************************************/
324 struct pes_packet_s * input_NetlistNewPES( void * p_method_data )
326 netlist_t * p_netlist;
327 pes_packet_t * p_return;
330 p_netlist = (netlist_t *) p_method_data;
333 vlc_mutex_lock ( &p_netlist->lock );
336 if ( p_netlist->i_pes_start == p_netlist->i_pes_end )
338 intf_ErrMsg("Empty PES FIFO in netlist - Unable to allocate memory");
343 p_return = p_netlist->pp_free_pes[p_netlist->i_pes_start];
344 p_netlist->i_pes_start++;
345 p_netlist->i_pes_start &= ( p_netlist->i_nb_pes - 1 );
348 vlc_mutex_unlock (&p_netlist->lock);
351 p_return->b_data_alignment =
352 p_return->b_discontinuity =
353 p_return->i_pts = p_return->i_dts = 0;
354 p_return->i_pes_size = 0;
355 p_return->p_first = NULL;
360 /*****************************************************************************
361 * input_NetlistDeletePacket: puts a data_packet_t back into the netlist
362 *****************************************************************************/
363 void input_NetlistDeletePacket( void * p_method_data, data_packet_t * p_data )
365 netlist_t * p_netlist;
368 p_netlist = (netlist_t *) p_method_data;
371 vlc_mutex_lock ( &p_netlist->lock );
374 /* Delete data_packet */
375 p_netlist->i_data_end ++;
376 p_netlist->i_data_end &= ( p_netlist->i_nb_data - 1 );
378 p_netlist->pp_free_data[p_netlist->i_data_end] = p_data;
379 p_netlist->p_free_iovec[p_netlist->i_data_end].iov_base = p_data->p_buffer;
381 /* re initialize for next time */
382 p_data->p_payload_start = p_data->p_buffer;
383 p_data->p_next = NULL;
386 vlc_mutex_unlock( &p_netlist->lock );
389 /*****************************************************************************
390 * input_NetlistDeletePES: puts a pes_packet_t back into the netlist
391 *****************************************************************************/
392 void input_NetlistDeletePES( void * p_method_data, pes_packet_t * p_pes )
394 netlist_t * p_netlist;
395 data_packet_t * p_current_packet,* p_next_packet;
398 p_netlist = (netlist_t *)p_method_data;
401 vlc_mutex_lock ( &p_netlist->lock );
403 /* delete free p_pes->p_first, p_next ... */
404 p_current_packet = p_pes->p_first;
405 while ( p_current_packet != NULL )
407 /* copy of NetListDeletePacket, duplicate code avoid many locks */
409 p_netlist->i_data_end ++;
410 p_netlist->i_data_end &= ( p_netlist->i_nb_data - 1 );
413 p_current_packet->p_payload_start = p_current_packet->p_buffer;
415 p_netlist->pp_free_data[p_netlist->i_data_end] = p_current_packet;
417 p_netlist->p_free_iovec[p_netlist->i_data_end].iov_base
418 = p_current_packet->p_buffer;
420 p_next_packet = p_current_packet->p_next;
421 p_current_packet->p_next = NULL;
422 p_current_packet = p_next_packet;
425 /* delete our current PES packet */
426 p_netlist->i_pes_end ++;
427 p_netlist->i_pes_end &= ( p_netlist->i_nb_pes - 1 );
428 p_netlist->pp_free_pes[p_netlist->i_pes_end] = p_pes;
431 vlc_mutex_unlock( &p_netlist->lock );
435 /*****************************************************************************
436 * input_NetlistEnd: frees all allocated structures
437 *****************************************************************************/
438 void input_NetlistEnd( input_thread_t * p_input)
440 netlist_t * p_netlist;
443 p_netlist = ( netlist_t * ) p_input->p_method_data;
445 /* destroy the mutex lock */
446 vlc_mutex_destroy (&p_netlist->lock);
448 /* free the FIFO, the buffer, and the netlist structure */
449 free( p_netlist->pp_free_data );
450 free( p_netlist->pp_free_pes );
451 free( p_netlist->p_pes );
452 free( p_netlist->p_data );
453 free( p_netlist->p_buffers );
455 /* free the netlist */