1 /*****************************************************************************
2 * mpgv.c : MPEG-I/II Video demuxer
3 *****************************************************************************
4 * Copyright (C) 2001-2004 VideoLAN
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
27 #include <stdlib.h> /* malloc(), free() */
30 #include <vlc/input.h>
31 #include "vlc_codec.h"
33 /*****************************************************************************
35 *****************************************************************************/
36 static int Open ( vlc_object_t * );
37 static void Close( vlc_object_t * );
40 set_category( CAT_INPUT );
41 set_subcategory( SUBCAT_INPUT_DEMUX );
42 set_description( _("MPEG-I/II video demuxer" ) );
43 set_capability( "demux2", 100 );
44 set_callbacks( Open, Close );
45 add_shortcut( "mpgv" );
48 /*****************************************************************************
50 *****************************************************************************/
57 decoder_t *p_packetizer;
60 static int Demux( demux_t * );
61 static int Control( demux_t *, int, va_list );
63 #define MPGV_PACKET_SIZE 4096
65 /*****************************************************************************
66 * Open: initializes demux structures
67 *****************************************************************************/
68 static int Open( vlc_object_t * p_this )
70 demux_t *p_demux = (demux_t*)p_this;
72 vlc_bool_t b_forced = VLC_FALSE;
78 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
80 msg_Err( p_demux, "cannot peek" );
84 if( !strncmp( p_demux->psz_demux, "mpgv", 4 ) )
89 if( p_peek[0] != 0x00 || p_peek[1] != 0x00 || p_peek[2] != 0x01 )
93 msg_Warn( p_demux, "ES module discarded (no startcode)" );
97 msg_Err( p_demux, "this doesn't look like an MPEG ES stream, continuing" );
100 if( p_peek[3] > 0xb9 )
104 msg_Warn( p_demux, "ES module discarded (system startcode)" );
107 msg_Err( p_demux, "this seems to be a system stream (PS plug-in ?), but continuing" );
110 p_demux->pf_demux = Demux;
111 p_demux->pf_control= Control;
112 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
113 p_sys->b_start = VLC_TRUE;
117 * Load the mpegvideo packetizer
119 p_sys->p_packetizer = vlc_object_create( p_demux, VLC_OBJECT_PACKETIZER );
120 p_sys->p_packetizer->pf_decode_audio = NULL;
121 p_sys->p_packetizer->pf_decode_video = NULL;
122 p_sys->p_packetizer->pf_decode_sub = NULL;
123 p_sys->p_packetizer->pf_packetize = NULL;
124 es_format_Init( &p_sys->p_packetizer->fmt_in, VIDEO_ES,
125 VLC_FOURCC( 'm', 'p', 'g', 'v' ) );
126 es_format_Init( &p_sys->p_packetizer->fmt_out, UNKNOWN_ES, 0 );
127 p_sys->p_packetizer->p_module =
128 module_Need( p_sys->p_packetizer, "packetizer", NULL, 0 );
130 if( p_sys->p_packetizer->p_module == NULL)
132 vlc_object_destroy( p_sys->p_packetizer );
133 msg_Err( p_demux, "cannot find mpgv packetizer" );
141 es_format_Init( &fmt, VIDEO_ES, VLC_FOURCC( 'm', 'p', 'g', 'v' ) );
142 p_sys->p_es = es_out_Add( p_demux->out, &fmt );
147 /*****************************************************************************
148 * Close: frees unused data
149 *****************************************************************************/
150 static void Close( vlc_object_t * p_this )
152 demux_t *p_demux = (demux_t*)p_this;
153 demux_sys_t *p_sys = p_demux->p_sys;
155 module_Unneed( p_sys->p_packetizer, p_sys->p_packetizer->p_module );
156 vlc_object_destroy( p_sys->p_packetizer );
161 /*****************************************************************************
162 * Demux: reads and demuxes data packets
163 *****************************************************************************
164 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
165 *****************************************************************************/
166 static int Demux( demux_t *p_demux )
168 demux_sys_t *p_sys = p_demux->p_sys;
169 block_t *p_block_in, *p_block_out;
171 if( ( p_block_in = stream_Block( p_demux->s, MPGV_PACKET_SIZE ) ) == NULL )
179 p_block_in->i_dts = 1;
184 p_block_in->i_dts = 0;
187 while( (p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer, &p_block_in )) )
189 p_sys->b_start = VLC_FALSE;
193 block_t *p_next = p_block_out->p_next;
195 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
197 p_block_out->p_next = NULL;
198 es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
200 p_block_out = p_next;
206 /*****************************************************************************
208 *****************************************************************************/
209 static int Control( demux_t *p_demux, int i_query, va_list args )
211 /* demux_sys_t *p_sys = p_demux->p_sys; */
212 /* FIXME calculate the bitrate */
213 if( i_query == DEMUX_SET_TIME )
216 return demux2_vaControlHelper( p_demux->s,
218 0, 1, i_query, args );