1 /*****************************************************************************
2 * input_ps.c: PS demux and packet management
3 *****************************************************************************
4 * Copyright (C) 1998, 1999, 2000 VideoLAN
5 * $Id: input_ps.c,v 1.11 2001/03/15 01:42:20 sam Exp $
7 * Authors: Christophe Massiot <massiot@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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 #define MODULE_NAME ps
25 #include "modules_inner.h"
27 /*****************************************************************************
29 *****************************************************************************/
36 #include <sys/types.h>
51 #include "stream_control.h"
52 #include "input_ext-intf.h"
53 #include "input_ext-dec.h"
58 #include "mpeg_system.h"
64 /*****************************************************************************
66 *****************************************************************************/
67 static int PSProbe ( probedata_t * );
68 static int PSRead ( struct input_thread_s *,
69 data_packet_t * p_packets[INPUT_READ_ONCE] );
70 static void PSInit ( struct input_thread_s * );
71 static void PSEnd ( struct input_thread_s * );
72 static void PSSeek ( struct input_thread_s *, off_t );
73 static struct pes_packet_s * NewPES ( void * );
74 static struct data_packet_s * NewPacket ( void *, size_t );
75 static void DeletePacket( void *, struct data_packet_s * );
76 static void DeletePES ( void *, struct pes_packet_s * );
78 /*****************************************************************************
79 * Functions exported as capabilities. They are declared as static so that
80 * we don't pollute the namespace too much.
81 *****************************************************************************/
82 void _M( input_getfunctions )( function_list_t * p_function_list )
84 #define input p_function_list->functions.input
85 p_function_list->pf_probe = PSProbe;
86 input.pf_init = PSInit;
87 input.pf_open = input_FileOpen;
88 input.pf_close = input_FileClose;
90 input.pf_set_area = NULL;
91 input.pf_read = PSRead;
92 input.pf_demux = input_DemuxPS;
93 input.pf_new_packet = NewPacket;
94 input.pf_new_pes = NewPES;
95 input.pf_delete_packet = DeletePacket;
96 input.pf_delete_pes = DeletePES;
97 input.pf_rewind = NULL;
98 input.pf_seek = PSSeek;
103 * Data reading functions
106 /*****************************************************************************
107 * PSProbe: verifies that the stream is a PS stream
108 *****************************************************************************/
109 static int PSProbe( probedata_t *p_data )
111 input_thread_t * p_input = (input_thread_t *)p_data;
113 char * psz_name = p_input->p_source;
117 if( TestMethod( INPUT_METHOD_VAR, "ps" ) )
122 if( ( strlen(psz_name) > 5 ) && !strncasecmp( psz_name, "file:", 5 ) )
124 /* If the user specified "file:" then it's probably a file */
129 i_handle = open( psz_name, 0 );
139 /*****************************************************************************
140 * PSInit: initializes PS structures
141 *****************************************************************************/
142 static void PSInit( input_thread_t * p_input )
144 thread_ps_data_t * p_method;
147 (thread_ps_data_t *)malloc( sizeof(thread_ps_data_t) )) == NULL )
149 intf_ErrMsg( "Out of memory" );
150 p_input->b_error = 1;
154 p_input->p_plugin_data = (void *)p_method;
155 p_input->p_method_data = NULL;
157 /* Re-open the socket as a buffered FILE stream */
158 if( (p_method->stream = fdopen( p_input->i_handle, "r" )) == NULL )
160 intf_ErrMsg( "Cannot open file (%s)", strerror(errno) );
161 p_input->b_error = 1;
164 rewind( p_method->stream );
166 /* FIXME : detect if InitStream failed */
167 input_InitStream( p_input, sizeof( stream_ps_data_t ) );
168 input_AddProgram( p_input, 0, sizeof( stream_ps_data_t ) );
170 if( p_input->stream.b_seekable )
172 stream_ps_data_t * p_demux_data =
173 (stream_ps_data_t *)p_input->stream.pp_programs[0]->p_demux_data;
175 /* Pre-parse the stream to gather stream_descriptor_t. */
176 p_input->stream.pp_programs[0]->b_is_ok = 0;
177 p_demux_data->i_PSM_version = EMPTY_PSM_VERSION;
179 while( !p_input->b_die && !p_input->b_error
180 && !p_demux_data->b_has_PSM )
183 data_packet_t * pp_packets[INPUT_READ_ONCE];
185 i_result = PSRead( p_input, pp_packets );
189 vlc_mutex_lock( &p_input->stream.stream_lock );
190 p_input->stream.pp_programs[0]->b_is_ok = 1;
191 vlc_mutex_unlock( &p_input->stream.stream_lock );
196 p_input->b_error = 1;
200 for( i = 0; i < INPUT_READ_ONCE && pp_packets[i] != NULL; i++ )
202 /* FIXME: use i_p_config_t */
203 input_ParsePS( p_input, pp_packets[i] );
204 DeletePacket( p_input->p_method_data, pp_packets[i] );
208 if( p_input->stream.p_selected_area->i_tell >
209 INPUT_PREPARSE_LENGTH )
214 rewind( p_method->stream );
215 vlc_mutex_lock( &p_input->stream.stream_lock );
216 p_input->stream.p_selected_area->i_tell = 0;
217 if( p_demux_data->b_has_PSM )
219 /* (The PSM decoder will care about spawning the decoders) */
220 p_input->stream.pp_programs[0]->b_is_ok = 1;
225 /* (We have to do it ourselves) */
228 /* FIXME: we should do multiple passes in case an audio type
231 i_es < p_input->stream.pp_programs[0]->i_es_number;
234 #define p_es p_input->stream.pp_programs[0]->pp_es[i_es]
235 switch( p_es->i_type )
239 input_SelectES( p_input, p_es );
244 if( main_GetIntVariable( INPUT_CHANNEL_VAR, 0 )
245 == (p_es->i_id & 0x1F) )
246 switch( main_GetIntVariable( INPUT_AUDIO_VAR, 0 ) )
249 main_PutIntVariable( INPUT_AUDIO_VAR,
252 input_SelectES( p_input, p_es );
257 if( main_GetIntVariable( INPUT_CHANNEL_VAR, 0 )
258 == ((p_es->i_id & 0xF00) >> 8) )
259 switch( main_GetIntVariable( INPUT_AUDIO_VAR, 0 ) )
262 main_PutIntVariable( INPUT_AUDIO_VAR,
265 input_SelectES( p_input, p_es );
270 if( main_GetIntVariable( INPUT_SUBTITLE_VAR, -1 )
271 == ((p_es->i_id & 0x1F00) >> 8) )
273 input_SelectES( p_input, p_es );
286 input_DumpStream( p_input );
288 vlc_mutex_unlock( &p_input->stream.stream_lock );
292 /* The programs will be added when we read them. */
293 vlc_mutex_lock( &p_input->stream.stream_lock );
294 p_input->stream.pp_programs[0]->b_is_ok = 0;
295 vlc_mutex_unlock( &p_input->stream.stream_lock );
299 /*****************************************************************************
300 * PSEnd: frees unused data
301 *****************************************************************************/
302 static void PSEnd( input_thread_t * p_input )
304 free( p_input->p_plugin_data );
307 /*****************************************************************************
308 * SafeRead: reads a chunk of stream and correctly detects errors
309 *****************************************************************************/
310 static __inline__ int SafeRead( input_thread_t * p_input, byte_t * p_buffer,
313 thread_ps_data_t * p_method;
316 p_method = (thread_ps_data_t *)p_input->p_plugin_data;
317 while( fread( p_buffer, i_len, 1, p_method->stream ) != 1 )
319 if( feof( p_method->stream ) )
324 if( (i_error = ferror( p_method->stream )) )
326 intf_ErrMsg( "Read failed (%s)", strerror(i_error) );
330 vlc_mutex_lock( &p_input->stream.stream_lock );
331 p_input->stream.p_selected_area->i_tell += i_len;
332 vlc_mutex_unlock( &p_input->stream.stream_lock );
336 /*****************************************************************************
337 * PSRead: reads data packets
338 *****************************************************************************
339 * Returns -1 in case of error, 0 if everything went well, and 1 in case of
341 *****************************************************************************/
342 static int PSRead( input_thread_t * p_input,
343 data_packet_t * pp_packets[INPUT_READ_ONCE] )
346 data_packet_t * p_data;
347 size_t i_packet_size;
348 int i_packet, i_error;
349 thread_ps_data_t * p_method;
351 p_method = (thread_ps_data_t *)p_input->p_plugin_data;
353 memset( pp_packets, 0, INPUT_READ_ONCE * sizeof(data_packet_t *) );
354 for( i_packet = 0; i_packet < INPUT_READ_ONCE; i_packet++ )
356 /* Read what we believe to be a packet header. */
357 if( (i_error = SafeRead( p_input, p_header, 6 )) )
362 if( (U32_AT(p_header) & 0xFFFFFF00) != 0x100L )
364 /* This is not the startcode of a packet. Read the stream
365 * until we find one. */
366 u32 i_startcode = U32_AT(p_header);
371 /* It is common for MPEG-1 streams to pad with zeros
372 * (although it is forbidden by the recommendation), so
373 * don't bother everybody in this case. */
374 intf_WarnMsg( 1, "Garbage at input (%.8x)", i_startcode );
377 while( (i_startcode & 0xFFFFFF00) != 0x100L )
380 if( (i_dummy = getc( p_method->stream )) != EOF )
382 i_startcode |= i_dummy;
390 *(u32 *)p_header = U32_AT(&i_startcode);
391 if( (i_error = SafeRead( p_input, p_header + 4, 2 )) )
397 if( U32_AT(p_header) != 0x1BA )
399 /* That's the case for all packets, except pack header. */
400 i_packet_size = U16_AT(&p_header[4]);
405 if( (p_header[4] & 0xC0) == 0x40 )
410 else if( (p_header[4] & 0xF0) == 0x20 )
417 intf_ErrMsg( "Unable to determine stream type" );
422 /* Fetch a packet of the appropriate size. */
423 if( (p_data = NewPacket( p_input, i_packet_size + 6 )) == NULL )
425 intf_ErrMsg( "Out of memory" );
429 /* Copy the header we already read. */
430 memcpy( p_data->p_buffer, p_header, 6 );
432 /* Read the remaining of the packet. */
433 if( i_packet_size && (i_error =
434 SafeRead( p_input, p_data->p_buffer + 6, i_packet_size )) )
439 /* In MPEG-2 pack headers we still have to read stuffing bytes. */
440 if( U32_AT(p_header) == 0x1BA )
442 if( i_packet_size == 8 && (p_data->p_buffer[13] & 0x7) != 0 )
444 /* MPEG-2 stuffing bytes */
446 if( (i_error = SafeRead( p_input, p_garbage,
447 p_data->p_buffer[13] & 0x7)) )
454 /* Give the packet to the other input stages. */
455 pp_packets[i_packet] = p_data;
461 /*****************************************************************************
462 * PSSeek: changes the stream position indicator
463 *****************************************************************************/
464 static void PSSeek( input_thread_t * p_input, off_t i_position )
466 thread_ps_data_t * p_method;
468 p_method = (thread_ps_data_t *)p_input->p_plugin_data;
470 /* A little bourrin but should work for a while --Meuuh */
471 fseeko( p_method->stream, i_position, SEEK_SET );
473 p_input->stream.p_selected_area->i_tell = i_position;
477 * Packet management utilities
480 /*****************************************************************************
481 * NewPacket: allocates a data packet
482 *****************************************************************************/
483 static struct data_packet_s * NewPacket( void * p_garbage,
486 data_packet_t * p_data;
489 if( i_size > INPUT_MAX_PACKET_SIZE )
491 intf_ErrMsg( "Packet too big (%d)", i_size );
495 if( (p_data = (data_packet_t *)malloc( sizeof(data_packet_t) )) == NULL )
497 intf_DbgMsg( "Out of memory" );
501 if( (p_data->p_buffer = (byte_t *)malloc( i_size )) == NULL )
503 intf_DbgMsg( "Out of memory" );
508 /* Initialize data */
509 p_data->p_next = NULL;
510 p_data->b_discard_payload = 0;
512 p_data->p_payload_start = p_data->p_buffer;
513 p_data->p_payload_end = p_data->p_buffer + i_size;
518 /*****************************************************************************
519 * NewPES: allocates a pes packet
520 *****************************************************************************/
521 static pes_packet_t * NewPES( void * p_garbage )
523 pes_packet_t * p_pes;
525 if( (p_pes = (pes_packet_t *)malloc( sizeof(pes_packet_t) )) == NULL )
527 intf_DbgMsg( "Out of memory" );
531 p_pes->b_data_alignment = p_pes->b_discontinuity =
532 p_pes->i_pts = p_pes->i_dts = 0;
533 p_pes->i_pes_size = 0;
534 p_pes->p_first = NULL;
539 /*****************************************************************************
540 * DeletePacket: deletes a data packet
541 *****************************************************************************/
542 static void DeletePacket( void * p_garbage,
543 data_packet_t * p_data )
546 ASSERT(p_data->p_buffer);
547 free( p_data->p_buffer );
551 /*****************************************************************************
552 * DeletePES: deletes a PES packet and associated data packets
553 *****************************************************************************/
554 static void DeletePES( void * p_garbage, pes_packet_t * p_pes )
556 data_packet_t * p_data;
557 data_packet_t * p_next;
559 p_data = p_pes->p_first;
561 while( p_data != NULL )
563 p_next = p_data->p_next;
564 free( p_data->p_buffer );