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_description( _("MPEG-I/II video demuxer" ) );
41 set_capability( "demux2", 100 );
42 set_callbacks( Open, Close );
43 add_shortcut( "mpgv" );
46 /*****************************************************************************
48 *****************************************************************************/
55 decoder_t *p_packetizer;
58 static int Demux( demux_t * );
59 static int Control( demux_t *, int, va_list );
61 #define MPGV_PACKET_SIZE 4096
63 /*****************************************************************************
64 * Open: initializes demux structures
65 *****************************************************************************/
66 static int Open( vlc_object_t * p_this )
68 demux_t *p_demux = (demux_t*)p_this;
70 vlc_bool_t b_forced = VLC_FALSE;
76 if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )
78 msg_Err( p_demux, "cannot peek" );
82 if( !strncmp( p_demux->psz_demux, "mpgv", 4 ) )
87 if( p_peek[0] != 0x00 || p_peek[1] != 0x00 || p_peek[2] != 0x01 )
91 msg_Warn( p_demux, "ES module discarded (no startcode)" );
95 msg_Err( p_demux, "this doesn't look like an MPEG ES stream, continuing" );
98 if( p_peek[3] > 0xb9 )
102 msg_Warn( p_demux, "ES module discarded (system startcode)" );
105 msg_Err( p_demux, "this seems to be a system stream (PS plug-in ?), but continuing" );
108 p_demux->pf_demux = Demux;
109 p_demux->pf_control= Control;
110 p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
111 p_sys->b_start = VLC_TRUE;
115 * Load the mpegvideo packetizer
117 p_sys->p_packetizer = vlc_object_create( p_demux, VLC_OBJECT_PACKETIZER );
118 p_sys->p_packetizer->pf_decode_audio = NULL;
119 p_sys->p_packetizer->pf_decode_video = NULL;
120 p_sys->p_packetizer->pf_decode_sub = NULL;
121 p_sys->p_packetizer->pf_packetize = NULL;
122 es_format_Init( &p_sys->p_packetizer->fmt_in, VIDEO_ES,
123 VLC_FOURCC( 'm', 'p', 'g', 'v' ) );
124 es_format_Init( &p_sys->p_packetizer->fmt_out, UNKNOWN_ES, 0 );
125 p_sys->p_packetizer->p_module =
126 module_Need( p_sys->p_packetizer, "packetizer", NULL, 0 );
128 if( p_sys->p_packetizer->p_module == NULL)
130 vlc_object_destroy( p_sys->p_packetizer );
131 msg_Err( p_demux, "cannot find mpgv packetizer" );
139 es_format_Init( &fmt, VIDEO_ES, VLC_FOURCC( 'm', 'p', 'g', 'v' ) );
140 p_sys->p_es = es_out_Add( p_demux->out, &fmt );
145 /*****************************************************************************
146 * Close: frees unused data
147 *****************************************************************************/
148 static void Close( vlc_object_t * p_this )
150 demux_t *p_demux = (demux_t*)p_this;
151 demux_sys_t *p_sys = p_demux->p_sys;
153 module_Unneed( p_sys->p_packetizer, p_sys->p_packetizer->p_module );
154 vlc_object_destroy( p_sys->p_packetizer );
159 /*****************************************************************************
160 * Demux: reads and demuxes data packets
161 *****************************************************************************
162 * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
163 *****************************************************************************/
164 static int Demux( demux_t *p_demux )
166 demux_sys_t *p_sys = p_demux->p_sys;
167 block_t *p_block_in, *p_block_out;
169 if( ( p_block_in = stream_Block( p_demux->s, MPGV_PACKET_SIZE ) ) == NULL )
177 p_block_in->i_dts = 1;
182 p_block_in->i_dts = 0;
185 while( (p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer, &p_block_in )) )
187 p_sys->b_start = VLC_FALSE;
191 block_t *p_next = p_block_out->p_next;
193 es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );
195 p_block_out->p_next = NULL;
196 es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
198 p_block_out = p_next;
204 /*****************************************************************************
206 *****************************************************************************/
207 static int Control( demux_t *p_demux, int i_query, va_list args )
209 /* demux_sys_t *p_sys = p_demux->p_sys; */
210 /* FIXME calculate the bitrate */
211 if( i_query == DEMUX_SET_TIME )
214 return demux2_vaControlHelper( p_demux->s,
216 0, 1, i_query, args );