1 /*****************************************************************************
2  * vc1.c : VC1 Video demuxer
3  *****************************************************************************
4  * Copyright (C) 2002-2004 VLC authors and VideoLAN
5  * $Id: 41d23669216376d0d16cf81e874122d47ac49618 $
6  *
7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8  *
9  * This program is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
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 Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public License
20  * along with this program; if not, write to the Free Software Foundation,
21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22  *****************************************************************************/
23 
24 /*****************************************************************************
25  * Preamble
26  *****************************************************************************/
27 
28 #ifdef HAVE_CONFIG_H
29 # include "config.h"
30 #endif
31 
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
34 #include <vlc_demux.h>
35 #include <vlc_codec.h>
36 
37 /*****************************************************************************
38  * Module descriptor
39  *****************************************************************************/
40 static int  Open ( vlc_object_t * );
41 static void Close( vlc_object_t * );
42 
43 #define FPS_TEXT N_("Frames per Second")
44 #define FPS_LONGTEXT N_("Desired frame rate for the VC-1 stream.")
45 
46 vlc_module_begin ()
47     set_shortname( "VC-1")
48     set_category( CAT_INPUT )
49     set_subcategory( SUBCAT_INPUT_DEMUX )
50     set_description( N_("VC1 video demuxer" ) )
51     set_capability( "demux", 0 )
52     add_float( "vc1-fps", 25.0, FPS_TEXT, FPS_LONGTEXT, true )
53     set_callbacks( Open, Close )
54     add_shortcut( "vc1" )
55 vlc_module_end ()
56 
57 /*****************************************************************************
58  * Local prototypes
59  *****************************************************************************/
60 struct demux_sys_t
61 {
62     mtime_t     i_dts;
63     es_out_id_t *p_es;
64 
65     float       f_fps;
66     decoder_t *p_packetizer;
67 };
68 
69 static int Demux( demux_t * );
70 static int Control( demux_t *, int, va_list );
71 
72 #define VC1_PACKET_SIZE 4096
73 
74 /*****************************************************************************
75  * Open: initializes demux structures
76  *****************************************************************************/
Open(vlc_object_t * p_this)77 static int Open( vlc_object_t * p_this )
78 {
79     demux_t     *p_demux = (demux_t*)p_this;
80     demux_sys_t *p_sys;
81     const uint8_t *p_peek;
82     es_format_t fmt;
83 
84     if( vlc_stream_Peek( p_demux->s, &p_peek, 4 ) < 4 ) return VLC_EGENERIC;
85 
86     if( p_peek[0] != 0x00 || p_peek[1] != 0x00 ||
87         p_peek[2] != 0x01 || p_peek[3] != 0x0f ) /* Sequence header */
88     {
89         if( !p_demux->obj.force )
90         {
91             msg_Warn( p_demux, "vc-1 module discarded (no startcode)" );
92             return VLC_EGENERIC;
93         }
94 
95         msg_Err( p_demux, "this doesn't look like a VC-1 ES stream, "
96                  "continuing anyway" );
97     }
98 
99     p_sys = malloc( sizeof( demux_sys_t ) );
100     if( unlikely(p_sys == NULL) )
101         return VLC_ENOMEM;
102 
103     p_demux->pf_demux  = Demux;
104     p_demux->pf_control= Control;
105     p_demux->p_sys     = p_sys;
106     p_sys->p_es        = NULL;
107     p_sys->i_dts       = 0;
108     p_sys->f_fps = var_CreateGetFloat( p_demux, "vc1-fps" );
109     if( p_sys->f_fps < 0.001f )
110         p_sys->f_fps = 0.0f;
111 
112     /* Load the packetizer */
113     es_format_Init( &fmt, VIDEO_ES, VLC_CODEC_VC1 );
114     p_sys->p_packetizer = demux_PacketizerNew( p_demux, &fmt, "VC-1" );
115     if( !p_sys->p_packetizer )
116     {
117         free( p_sys );
118         return VLC_EGENERIC;
119     }
120     return VLC_SUCCESS;
121 }
122 
123 /*****************************************************************************
124  * Close: frees unused data
125  *****************************************************************************/
Close(vlc_object_t * p_this)126 static void Close( vlc_object_t * p_this )
127 {
128     demux_t     *p_demux = (demux_t*)p_this;
129     demux_sys_t *p_sys = p_demux->p_sys;
130 
131     demux_PacketizerDestroy( p_sys->p_packetizer );
132     free( p_sys );
133 }
134 
135 /*****************************************************************************
136  * Demux: reads and demuxes data packets
137  *****************************************************************************
138  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
139  *****************************************************************************/
Demux(demux_t * p_demux)140 static int Demux( demux_t *p_demux)
141 {
142     demux_sys_t *p_sys = p_demux->p_sys;
143     block_t *p_block_in, *p_block_out;
144     bool b_eof = false;
145 
146     p_block_in = vlc_stream_Block( p_demux->s, VC1_PACKET_SIZE );
147     if( p_block_in == NULL )
148     {
149         b_eof = true;
150     }
151     else
152     {
153         /*  */
154         p_block_in->i_dts = VLC_TS_0;
155         p_block_in->i_pts = VLC_TS_0;
156     }
157 
158     while( (p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer,
159                                                              p_block_in ? &p_block_in : NULL )) )
160     {
161         while( p_block_out )
162         {
163             block_t *p_next = p_block_out->p_next;
164 
165             p_block_out->p_next = NULL;
166 
167             if( p_sys->p_es == NULL )
168             {
169                 p_sys->p_packetizer->fmt_out.b_packetized = true;
170                 p_sys->p_es = es_out_Add( p_demux->out, &p_sys->p_packetizer->fmt_out);
171             }
172 
173             es_out_SetPCR( p_demux->out, VLC_TS_0 + p_sys->i_dts );
174             p_block_out->i_dts = VLC_TS_0 + p_sys->i_dts;
175             p_block_out->i_pts = VLC_TS_0 + p_sys->i_dts;
176 
177             es_out_Send( p_demux->out, p_sys->p_es, p_block_out );
178 
179             p_block_out = p_next;
180 
181             if( p_sys->p_packetizer->fmt_out.video.i_frame_rate > 0 &&
182                 p_sys->p_packetizer->fmt_out.video.i_frame_rate_base > 0 )
183                 p_sys->i_dts += CLOCK_FREQ *
184                     p_sys->p_packetizer->fmt_out.video.i_frame_rate_base /
185                     p_sys->p_packetizer->fmt_out.video.i_frame_rate;
186             else if( p_sys->f_fps > 0.001f )
187                 p_sys->i_dts += (int64_t)((float) CLOCK_FREQ / p_sys->f_fps);
188             else
189                 p_sys->i_dts += CLOCK_FREQ / 25;
190         }
191     }
192 
193     return b_eof ? VLC_DEMUXER_EOF : VLC_DEMUXER_SUCCESS;
194 }
195 
196 /*****************************************************************************
197  * Control:
198  *****************************************************************************/
Control(demux_t * p_demux,int i_query,va_list args)199 static int Control( demux_t *p_demux, int i_query, va_list args )
200 {
201     /* demux_sys_t *p_sys  = p_demux->p_sys; */
202     /* FIXME calculate the bitrate */
203     if( i_query == DEMUX_SET_TIME )
204         return VLC_EGENERIC;
205     else
206         return demux_vaControlHelper( p_demux->s,
207                                        0, -1,
208                                        0, 1, i_query, args );
209 }
210 
211