1 /*****************************************************************************
3 *****************************************************************************
4 * Copyright (C) 2004 the VideoLAN team
7 * Authors: Laurent Aimar <fenrir@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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
27 #include <stdlib.h> /* malloc(), free() */
30 #include <vlc_demux.h>
32 /*****************************************************************************
34 *****************************************************************************/
35 static int Open ( vlc_object_t * );
36 static void Close ( vlc_object_t * );
39 set_description( _("PVA demuxer" ) );
40 set_capability( "demux2", 10 );
41 set_category( CAT_INPUT );
42 set_subcategory( SUBCAT_INPUT_DEMUX );
43 set_callbacks( Open, Close );
44 add_shortcut( "pva" );
47 /*****************************************************************************
49 *****************************************************************************/
60 /* audio/video block */
61 block_t *p_pes; /* audio */
62 block_t *p_es; /* video */
67 static int Demux ( demux_t *p_demux );
68 static int Control ( demux_t *p_demux, int i_query, va_list args );
70 static int ReSynch ( demux_t * );
71 static void ParsePES( demux_t * );
73 /*****************************************************************************
75 *****************************************************************************/
76 static int Open( vlc_object_t *p_this )
78 demux_t *p_demux = (demux_t*)p_this;
83 if( stream_Peek( p_demux->s, &p_peek, 5 ) < 5 ) return VLC_EGENERIC;
84 if( p_peek[0] != 'A' || p_peek[1] != 'V' || p_peek[4] != 0x55 )
86 /* In case we had forced this demuxer we try to resynch */
87 if( strcasecmp( p_demux->psz_demux, "pva" ) || ReSynch( p_demux ) )
93 /* Fill p_demux field */
94 p_demux->pf_demux = Demux;
95 p_demux->pf_control = Control;
96 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
98 /* Register one audio and one video stream */
99 es_format_Init( &fmt, AUDIO_ES, VLC_FOURCC( 'm', 'p', 'g', 'a' ) );
100 p_sys->p_audio = es_out_Add( p_demux->out, &fmt );
102 es_format_Init( &fmt, VIDEO_ES, VLC_FOURCC( 'm', 'p', 'g', 'v' ) );
103 p_sys->p_video = es_out_Add( p_demux->out, &fmt );
110 p_sys->b_pcr_audio = VLC_FALSE;
115 /*****************************************************************************
117 *****************************************************************************/
118 static void Close( vlc_object_t *p_this )
120 demux_t *p_demux = (demux_t*)p_this;
121 demux_sys_t *p_sys = p_demux->p_sys;
123 if( p_sys->p_es ) block_Release( p_sys->p_es );
124 if( p_sys->p_pes ) block_Release( p_sys->p_pes );
130 /*****************************************************************************
132 *****************************************************************************/
133 static int Demux( demux_t *p_demux )
135 demux_sys_t *p_sys = p_demux->p_sys;
143 if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 )
145 msg_Warn( p_demux, "eof ?" );
148 if( p_peek[0] != 'A' || p_peek[1] != 'V' || p_peek[4] != 0x55 )
150 msg_Warn( p_demux, "lost synchro" );
151 if( ReSynch( p_demux ) )
155 if( stream_Peek( p_demux->s, &p_peek, 8 ) < 8 )
157 msg_Warn( p_demux, "eof ?" );
162 i_size = GetWBE( &p_peek[6] );
165 case 0x01: /* VideoStream */
166 if( p_sys->i_vc < 0 )
168 msg_Dbg( p_demux, "first packet for video" );
170 else if( ((p_sys->i_vc + 1)&0xff) != p_peek[3] )
172 msg_Dbg( p_demux, "packet lost (video)" );
175 block_ChainRelease( p_sys->p_es );
179 p_sys->i_vc = p_peek[3];
181 /* read the PTS and potential extra bytes TODO: make it a bit more optimised */
186 int i_pre = p_peek[5]&0x3;
188 if( ( p_frame = stream_Block( p_demux->s, 8 + 4 + i_pre ) ) )
190 i_pts = GetDWBE( &p_frame->p_buffer[8] );
191 if( p_frame->i_buffer > 12 )
193 p_frame->p_buffer += 12;
194 p_frame->i_buffer -= 12;
195 block_ChainAppend( &p_sys->p_es, p_frame );
199 block_Release( p_frame );
205 if( ( p_frame = p_sys->p_es ) )
208 if( p_frame->i_pts > 0 && !p_sys->b_pcr_audio )
210 es_out_Control( p_demux->out, ES_OUT_SET_PCR, (int64_t)p_frame->i_pts);
212 es_out_Send( p_demux->out, p_sys->p_video, p_frame );
218 if( ( p_frame = stream_Block( p_demux->s, i_size + i_skip ) ) )
220 p_frame->p_buffer += i_skip;
221 p_frame->i_buffer -= i_skip;
222 if( i_pts > 0 ) p_frame->i_pts = i_pts * 100 / 9;
223 block_ChainAppend( &p_sys->p_es, p_frame );
227 case 0x02: /* MainAudioStream */
228 if( p_sys->i_ac < 0 )
230 msg_Dbg( p_demux, "first packet for audio" );
232 else if( ((p_sys->i_ac + 1)&0xff) != p_peek[3] )
234 msg_Dbg( p_demux, "packet lost (audio)" );
237 block_ChainRelease( p_sys->p_pes );
241 p_sys->i_ac = p_peek[3];
243 if( p_peek[5]&0x10 && p_sys->p_pes )
247 if( ( p_frame = stream_Block( p_demux->s, i_size + 8 ) ) )
249 p_frame->p_buffer += 8;
250 p_frame->i_buffer -= 8;
251 /* XXX this a hack, some streams aren't compliant and
252 * doesn't set pes_start flag */
253 if( p_sys->p_pes && p_frame->i_buffer > 4 &&
254 p_frame->p_buffer[0] == 0x00 &&
255 p_frame->p_buffer[1] == 0x00 &&
256 p_frame->p_buffer[2] == 0x01 )
260 block_ChainAppend( &p_sys->p_pes, p_frame );
265 msg_Warn( p_demux, "unknown id=0x%x", p_peek[2] );
266 stream_Read( p_demux->s, NULL, i_size + 8 );
272 /*****************************************************************************
274 *****************************************************************************/
275 static int Control( demux_t *p_demux, int i_query, va_list args )
277 /* demux_sys_t *p_sys = p_demux->p_sys; */
282 case DEMUX_GET_POSITION:
283 if( ( i64 = stream_Size( p_demux->s ) ) > 0 )
285 pf = (double*) va_arg( args, double* );
286 *pf = (double)stream_Tell( p_demux->s ) / (double)i64;
291 case DEMUX_SET_POSITION:
292 f = (double) va_arg( args, double );
293 i64 = stream_Size( p_demux->s );
295 es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
296 if( stream_Seek( p_demux->s, (int64_t)(i64 * f) ) || ReSynch( p_demux ) )
304 pi64 = (int64_t*)va_arg( args, int64_t * );
305 if( p_sys->i_time < 0 )
310 *pi64 = p_sys->i_time;
314 case DEMUX_GET_LENGTH:
315 pi64 = (int64_t*)va_arg( args, int64_t * );
316 if( p_sys->i_mux_rate > 0 )
318 *pi64 = (int64_t)1000000 * ( stream_Size( p_demux->s ) / 50 ) / p_sys->i_mux_rate;
326 pf = (double*)va_arg( args, double * );
327 *pf = (double)1000000.0 / (double)p_sys->i_pcr_inc;
336 /*****************************************************************************
338 *****************************************************************************/
339 static int ReSynch( demux_t *p_demux )
345 while( !p_demux->b_die )
347 if( ( i_peek = stream_Peek( p_demux->s, &p_peek, 1024 ) ) < 8 )
353 while( i_skip < i_peek - 5 )
355 if( p_peek[0] == 'A' && p_peek[1] == 'V' && p_peek[4] == 0x55 )
359 stream_Read( p_demux->s, NULL, i_skip );
367 stream_Read( p_demux->s, NULL, i_skip );
373 static void ParsePES( demux_t *p_demux )
375 demux_sys_t *p_sys = p_demux->p_sys;
376 block_t *p_pes = p_sys->p_pes;
386 /* FIXME find real max size */
387 block_ChainExtract( p_pes, hdr, 30 );
389 if( hdr[0] != 0 || hdr[1] != 0 || hdr[2] != 1 )
391 msg_Warn( p_demux, "invalid hdr [0x%2.2x:%2.2x:%2.2x:%2.2x]",
392 hdr[0], hdr[1],hdr[2],hdr[3] );
393 block_ChainRelease( p_pes );
396 i_pes_size = GetWBE( &hdr[4] );
398 /* we assume mpeg2 PES */
400 if( hdr[7]&0x80 ) /* has pts */
402 i_pts = ((mtime_t)(hdr[ 9]&0x0e ) << 29)|
403 (mtime_t)(hdr[10] << 22)|
404 ((mtime_t)(hdr[11]&0xfe) << 14)|
405 (mtime_t)(hdr[12] << 7)|
406 (mtime_t)(hdr[12] >> 1);
408 if( hdr[7]&0x40 ) /* has dts */
410 i_dts = ((mtime_t)(hdr[14]&0x0e ) << 29)|
411 (mtime_t)(hdr[15] << 22)|
412 ((mtime_t)(hdr[16]&0xfe) << 14)|
413 (mtime_t)(hdr[17] << 7)|
414 (mtime_t)(hdr[18] >> 1);
418 p_pes = block_ChainGather( p_pes );
419 if( p_pes->i_buffer <= i_skip )
421 block_ChainRelease( p_pes );
425 p_pes->i_buffer -= i_skip;
426 p_pes->p_buffer += i_skip;
428 if( i_dts >= 0 ) p_pes->i_dts = i_dts * 100 / 9;
429 if( i_pts >= 0 ) p_pes->i_pts = i_pts * 100 / 9;
432 if( p_pes->i_pts > 0 )
434 es_out_Control( p_demux->out, ES_OUT_SET_PCR, (int64_t)p_pes->i_pts);
435 p_sys->b_pcr_audio = VLC_TRUE;
437 es_out_Send( p_demux->out, p_sys->p_audio, p_pes );