1 /*****************************************************************************
2 * input_netlist.c: netlist management
3 *****************************************************************************
4 * Copyright (C) 1998, 1999, 2000 VideoLAN
5 * $Id: input_netlist.c,v 1.42 2001/09/06 18:21:02 henri 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>
38 # include <io.h> /* read() */
40 # include <sys/uio.h> /* struct iovec */
45 #include "threads.h" /* mutex */
47 #include "intf_msg.h" /* intf_*Msg */
50 # include "input_iovec.h"
53 #include "stream_control.h"
54 #include "input_ext-intf.h"
55 #include "input_ext-dec.h"
56 #include "input_ext-plugins.h"
58 /*****************************************************************************
59 * input_NetlistInit: allocates netlist buffers and init indexes
60 *****************************************************************************/
61 int input_NetlistInit( input_thread_t * p_input, int i_nb_data, int i_nb_pes,
62 size_t i_buffer_size, int i_read_once )
65 netlist_t * p_netlist;
67 /* First we allocate and initialise our netlist struct */
68 p_input->p_method_data = malloc(sizeof(netlist_t));
69 if ( p_input->p_method_data == NULL )
71 intf_ErrMsg("Unable to malloc the netlist struct");
75 p_netlist = (netlist_t *) p_input->p_method_data;
77 p_netlist->i_read_once = i_read_once;
79 /* In order to optimize netlist, we are taking i_nb_data a 2^i
80 * so that modulo is an "&".
81 * This is not changing i_nb data outside this function except in
82 * the netlist_t struct */
83 /* As i_loop is unsigned int, and i_ns_data int, this shouldn't be a
85 for( i_loop = 1; i_loop < i_nb_data; i_loop *= 2 )
90 intf_DbgMsg( "Netlist : Required %i byte, got %u",i_nb_data,i_loop );
93 /* Same thing for i_nb_pes */
94 for( i_loop = 1; i_loop < i_nb_data; i_loop *= 2 )
99 intf_DbgMsg( "Netlist : Required %i byte, got %u",i_nb_data,i_loop );
102 /* allocate the buffers */
103 p_netlist->p_buffers =
104 (byte_t *) malloc(i_buffer_size* i_nb_data );
105 if ( p_netlist->p_buffers == NULL )
107 intf_ErrMsg ("Unable to malloc in netlist initialization (1)");
112 (data_packet_t *) malloc(sizeof(data_packet_t)*(i_nb_data));
113 if ( p_netlist->p_data == NULL )
115 intf_ErrMsg ("Unable to malloc in netlist initialization (2)");
120 (pes_packet_t *) malloc(sizeof(pes_packet_t)*(i_nb_pes));
121 if ( p_netlist->p_pes == NULL )
123 intf_ErrMsg ("Unable to malloc in netlist initialization (3)");
127 /* allocate the FIFOs */
128 p_netlist->pp_free_data =
129 (data_packet_t **) malloc (i_nb_data * sizeof(data_packet_t *) );
130 if ( p_netlist->pp_free_data == NULL )
132 intf_ErrMsg ("Unable to malloc in netlist initialization (4)");
134 p_netlist->pp_free_pes =
135 (pes_packet_t **) malloc (i_nb_pes * sizeof(pes_packet_t *) );
136 if ( p_netlist->pp_free_pes == NULL )
138 intf_ErrMsg ("Unable to malloc in netlist initialization (5)");
141 p_netlist->p_free_iovec = ( struct iovec * )
142 malloc( (i_nb_data + p_netlist->i_read_once) * sizeof(struct iovec) );
143 if ( p_netlist->p_free_iovec == NULL )
145 intf_ErrMsg ("Unable to malloc in netlist initialization (6)");
148 /* Fill the data FIFO */
149 for ( i_loop = 0; i_loop < i_nb_data; i_loop++ )
151 p_netlist->pp_free_data[i_loop] =
152 p_netlist->p_data + i_loop;
154 p_netlist->pp_free_data[i_loop]->p_buffer =
155 p_netlist->p_buffers + i_loop * i_buffer_size;
157 p_netlist->pp_free_data[i_loop]->p_payload_start =
158 p_netlist->pp_free_data[i_loop]->p_buffer;
160 p_netlist->pp_free_data[i_loop]->p_payload_end =
161 p_netlist->pp_free_data[i_loop]->p_buffer + i_buffer_size;
163 /* Fill the PES FIFO */
164 for ( i_loop = 0; i_loop < i_nb_pes ; i_loop++ )
166 p_netlist->pp_free_pes[i_loop] =
167 p_netlist->p_pes + i_loop;
170 /* Deal with the iovec */
171 for ( i_loop = 0; i_loop < i_nb_data; i_loop++ )
173 p_netlist->p_free_iovec[i_loop].iov_base =
174 p_netlist->p_buffers + i_loop * i_buffer_size;
176 p_netlist->p_free_iovec[i_loop].iov_len = i_buffer_size;
180 vlc_mutex_init (&p_netlist->lock);
182 /* initialize indexes */
183 p_netlist->i_data_start = 0;
184 p_netlist->i_data_end = i_nb_data - 1;
186 p_netlist->i_pes_start = 0;
187 p_netlist->i_pes_end = i_nb_pes - 1;
189 p_netlist->i_nb_data = i_nb_data;
190 p_netlist->i_nb_pes = i_nb_pes;
191 p_netlist->i_buffer_size = i_buffer_size;
193 return (0); /* Everything went all right */
196 /*****************************************************************************
197 * input_NetlistGetiovec: returns an iovec pointer for a readv() operation
198 *****************************************************************************
199 * We return an iovec vector, so that readv can read many packets at a time,
200 * and we set pp_data to direct to the fifo pointer, which will allow us
201 * to get the corresponding data_packet.
202 *****************************************************************************/
203 struct iovec * input_NetlistGetiovec( void * p_method_data )
205 netlist_t * p_netlist;
208 p_netlist = ( netlist_t * ) p_method_data;
212 ( (p_netlist->i_data_end - p_netlist->i_data_start + p_netlist->i_nb_data)
213 & ( p_netlist->i_nb_data -1 ) ) < p_netlist->i_read_once )
215 intf_ErrMsg("Empty iovec FIFO.");
219 /* readv only takes contiguous buffers
220 * so, as a solution, we chose to have a FIFO a bit longer
221 * than i_nb_data, and copy the begining of the FIFO to its end
222 * if the readv needs to go after the end */
223 if( p_netlist->i_nb_data - p_netlist->i_data_start <
224 p_netlist->i_read_once )
226 memcpy( &p_netlist->p_free_iovec[p_netlist->i_nb_data],
227 p_netlist->p_free_iovec,
228 (p_netlist->i_read_once-
229 (p_netlist->i_nb_data-p_netlist->i_data_start))
230 * sizeof(struct iovec)
235 return &p_netlist->p_free_iovec[p_netlist->i_data_start];
239 /*****************************************************************************
240 * input_NetlistMviovec: move the iovec pointer after a readv() operation
241 *****************************************************************************/
242 void input_NetlistMviovec( void * p_method_data, size_t i_nb_iovec,
243 struct data_packet_s * pp_packets[INPUT_READ_ONCE] )
245 netlist_t * p_netlist;
246 unsigned int i_loop = 0;
247 unsigned int i_current;
250 p_netlist = (netlist_t *) p_method_data;
253 vlc_mutex_lock ( &p_netlist->lock );
255 i_current = p_netlist->i_data_start;
258 /* Fills a table of pointers to packets associated with the io_vec's */
259 while (i_loop < i_nb_iovec )
261 if( i_current >= p_netlist->i_nb_data )
262 i_current-=p_netlist->i_nb_data;
264 pp_packets[i_loop] = p_netlist->pp_free_data[i_current];
265 pp_packets[i_loop]->b_discard_payload = 0;
271 p_netlist->i_data_start += i_nb_iovec;
272 p_netlist->i_data_start &= ( p_netlist->i_nb_data - 1 );
275 vlc_mutex_unlock (&p_netlist->lock);
279 /*****************************************************************************
280 * input_NetlistNewPacket: returns a free data_packet_t
281 *****************************************************************************/
282 struct data_packet_s * input_NetlistNewPacket( void * p_method_data,
283 size_t i_buffer_size )
285 netlist_t * p_netlist;
286 struct data_packet_s * p_return;
289 p_netlist = ( netlist_t * ) p_method_data;
292 if( i_buffer_size > p_netlist->i_buffer_size )
294 /* This should not happen */
295 intf_ErrMsg( "Netlist packet too small !" );
301 vlc_mutex_lock ( &p_netlist->lock );
304 if ( p_netlist->i_data_start == p_netlist->i_data_end )
306 intf_ErrMsg("Empty Data FIFO in netlist.");
310 p_return = p_netlist->pp_free_data[p_netlist->i_data_start];
311 p_netlist->i_data_start++;
312 p_netlist->i_data_start &= ( p_netlist->i_nb_data - 1 );
315 vlc_mutex_unlock (&p_netlist->lock);
318 /* initialize data */
319 p_return->p_next = NULL;
320 p_return->b_discard_payload = 0;
322 p_return->p_payload_start = p_return->p_buffer;
323 p_return->p_payload_end = p_return->p_payload_start + i_buffer_size;
328 /*****************************************************************************
329 * input_NetlistNewPES: returns a free pes_packet_t
330 *****************************************************************************/
331 struct pes_packet_s * input_NetlistNewPES( void * p_method_data )
333 netlist_t * p_netlist;
334 pes_packet_t * p_return;
337 p_netlist = (netlist_t *) p_method_data;
340 vlc_mutex_lock ( &p_netlist->lock );
343 if ( p_netlist->i_pes_start == p_netlist->i_pes_end )
345 intf_ErrMsg("Empty PES FIFO in netlist");
350 p_return = p_netlist->pp_free_pes[p_netlist->i_pes_start];
351 p_netlist->i_pes_start++;
352 p_netlist->i_pes_start &= ( p_netlist->i_nb_pes - 1 );
355 vlc_mutex_unlock (&p_netlist->lock);
358 p_return->b_data_alignment =
359 p_return->b_discontinuity =
360 p_return->i_pts = p_return->i_dts = 0;
361 p_return->i_pes_size = 0;
362 p_return->p_first = NULL;
367 /*****************************************************************************
368 * input_NetlistDeletePacket: puts a data_packet_t back into the netlist
369 *****************************************************************************/
370 void input_NetlistDeletePacket( void * p_method_data, data_packet_t * p_data )
372 netlist_t * p_netlist;
375 p_netlist = (netlist_t *) p_method_data;
378 vlc_mutex_lock ( &p_netlist->lock );
381 /* Delete data_packet */
382 p_netlist->i_data_end ++;
383 p_netlist->i_data_end &= ( p_netlist->i_nb_data - 1 );
385 p_netlist->pp_free_data[p_netlist->i_data_end] = p_data;
386 p_netlist->p_free_iovec[p_netlist->i_data_end].iov_base = p_data->p_buffer;
388 /* re initialize for next time */
389 p_data->p_payload_start = p_data->p_buffer;
390 p_data->p_next = NULL;
393 vlc_mutex_unlock( &p_netlist->lock );
396 /*****************************************************************************
397 * input_NetlistDeletePES: puts a pes_packet_t back into the netlist
398 *****************************************************************************/
399 void input_NetlistDeletePES( void * p_method_data, pes_packet_t * p_pes )
401 netlist_t * p_netlist;
402 data_packet_t * p_current_packet,* p_next_packet;
405 p_netlist = (netlist_t *)p_method_data;
408 vlc_mutex_lock ( &p_netlist->lock );
410 /* delete free p_pes->p_first, p_next ... */
411 p_current_packet = p_pes->p_first;
412 while ( p_current_packet != NULL )
414 /* copy of NetListDeletePacket, duplicate code avoid many locks */
416 p_netlist->i_data_end ++;
417 p_netlist->i_data_end &= ( p_netlist->i_nb_data - 1 );
420 p_current_packet->p_payload_start = p_current_packet->p_buffer;
422 p_netlist->pp_free_data[p_netlist->i_data_end] = p_current_packet;
424 p_netlist->p_free_iovec[p_netlist->i_data_end].iov_base
425 = p_current_packet->p_buffer;
427 p_next_packet = p_current_packet->p_next;
428 p_current_packet->p_next = NULL;
429 p_current_packet = p_next_packet;
432 /* delete our current PES packet */
433 p_netlist->i_pes_end ++;
434 p_netlist->i_pes_end &= ( p_netlist->i_nb_pes - 1 );
435 p_netlist->pp_free_pes[p_netlist->i_pes_end] = p_pes;
438 vlc_mutex_unlock( &p_netlist->lock );
442 /*****************************************************************************
443 * input_NetlistEnd: frees all allocated structures
444 *****************************************************************************/
445 void input_NetlistEnd( input_thread_t * p_input)
447 netlist_t * p_netlist;
450 p_netlist = ( netlist_t * ) p_input->p_method_data;
452 /* destroy the mutex lock */
453 vlc_mutex_destroy (&p_netlist->lock);
455 /* free the FIFO, the buffer, and the netlist structure */
456 free( p_netlist->pp_free_data );
457 free( p_netlist->pp_free_pes );
458 free( p_netlist->p_pes );
459 free( p_netlist->p_data );
460 free( p_netlist->p_buffers );
462 /* free the netlist */