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[vlc] / modules / demux / mpeg / m4v.c
1 /*****************************************************************************
2  * m4v.c : MPEG-4 video Stream input module for vlc
3  *****************************************************************************
4  * Copyright (C) 2002 VideoLAN
5  * $Id: m4v.c,v 1.3 2003/03/14 00:24:08 sigmunau Exp $
6  *
7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8  *
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.
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 General Public License for more details.
18  *
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  *****************************************************************************/
23
24 /*****************************************************************************
25  * Preamble
26  *****************************************************************************/
27 #include <stdlib.h>                                      /* malloc(), free() */
28 #include <string.h>
29
30 #include <vlc/vlc.h>
31 #include <vlc/input.h>
32
33 /*****************************************************************************
34  * Local prototypes
35  *****************************************************************************/
36 static int  Activate ( vlc_object_t * );
37 static int  Demux ( input_thread_t * );
38
39 /*****************************************************************************
40  * Module descriptor
41  *****************************************************************************/
42 vlc_module_begin();
43     set_description( _("MPEG-4 video elementary stream demux" ) );
44     set_capability( "demux", 0 );
45     set_callbacks( Activate, NULL );
46     add_shortcut( "m4v" );
47 vlc_module_end();
48
49 /*****************************************************************************
50  * Definitions of structures  and functions used by this plugins 
51  *****************************************************************************/
52
53 struct demux_sys_t
54 {
55     mtime_t i_dts;
56
57     es_descriptor_t *p_es;
58 };
59
60
61 /*****************************************************************************
62  * Activate: initializes MPEGaudio structures
63  *****************************************************************************/
64 static int Activate( vlc_object_t * p_this )
65 {
66     input_thread_t * p_input = (input_thread_t *)p_this;
67     demux_sys_t * p_demux;
68     input_info_category_t * p_category;
69
70     uint8_t *p_peek;
71
72     /* Set the demux function */
73     p_input->pf_demux = Demux;
74
75     /* Initialize access plug-in structures. */
76     if( p_input->i_mtu == 0 )
77     {
78         /* Improve speed. */
79         p_input->i_bufsize = INPUT_DEFAULT_BUFSIZE;
80     }
81
82     /* Have a peep at the show. */
83     if( input_Peek( p_input, &p_peek, 4 ) < 4 )
84     {
85         /* Stream shorter than 4 bytes... */
86         msg_Err( p_input, "cannot peek()" );
87         return( -1 );
88     }
89
90     if( p_peek[0] != 0x00 || p_peek[1] != 0x00 || p_peek[2] != 0x01 || p_peek[3] > 0x2f )
91     {
92         if( *p_input->psz_demux && !strncmp( p_input->psz_demux, "m4v", 3 ) )
93         {
94             /* user forced */
95             msg_Warn( p_input, "this doesn't look like an MPEG-4 ES stream, continuing" );
96         }
97         else
98         {
99             msg_Warn( p_input, "m4v module discarded (invalid startcode)" );
100             return( -1 );
101         }
102     }
103
104     /* create p_demux and init it */
105     if( !( p_demux = p_input->p_demux_data = malloc( sizeof(demux_sys_t) ) ) )
106     {
107         msg_Err( p_input, "out of memory" );
108         return( -1 );
109     }
110     memset( p_demux, 0, sizeof(demux_sys_t) );
111     p_demux->i_dts = 0;
112
113     vlc_mutex_lock( &p_input->stream.stream_lock );
114     if( input_InitStream( p_input, 0 ) == -1)
115     {
116         msg_Err( p_input, "cannot init stream" );
117         free( p_input->p_demux_data );
118         return( -1 );
119     }
120     if( input_AddProgram( p_input, 0, 0) == NULL )
121     {
122         msg_Err( p_input, "cannot add program" );
123         free( p_input->p_demux_data );
124         return( -1 );
125     }
126     p_input->stream.pp_programs[0]->b_is_ok = 0;
127     p_input->stream.p_selected_program = p_input->stream.pp_programs[0];
128
129     /* create our ES */
130     p_demux->p_es = input_AddES( p_input,
131                                  p_input->stream.p_selected_program,
132                                  1, /* id */
133                                  0 );
134     if( !p_demux->p_es )
135     {
136         vlc_mutex_unlock( &p_input->stream.stream_lock );
137         msg_Err( p_input, "out of memory" );
138         free( p_input->p_demux_data );
139         return( -1 );
140     }
141     p_demux->p_es->i_stream_id = 1;
142     p_demux->p_es->i_fourcc = VLC_FOURCC('m','p','4','v');
143     p_demux->p_es->i_cat = VIDEO_ES;
144
145     input_SelectES( p_input, p_demux->p_es );
146
147     p_input->stream.p_selected_program->b_is_ok = 1;
148     vlc_mutex_unlock( &p_input->stream.stream_lock );
149
150     vlc_mutex_lock( &p_input->stream.stream_lock );
151     p_category = input_InfoCategory( p_input, _("mpeg") );
152     input_AddInfo( p_category, _("Input Type"), _("Video MPEG-4 (raw ES)") );
153     vlc_mutex_unlock( &p_input->stream.stream_lock );
154
155     return( 0 );
156 }
157
158 /*****************************************************************************
159  * Demux: reads and demuxes data packets
160  *****************************************************************************
161  * Returns -1 in case of error, 0 in case of EOF, 1 otherwise
162  *****************************************************************************/
163 static int FindStartCode( uint8_t *p_data, int i_size, uint8_t i_startcode, uint8_t i_mask )
164 {
165     int i_pos = 0;
166
167     for( i_pos = 0; i_size >= 4; i_pos++,i_size--,p_data++ )
168     {
169         if( p_data[0] == 0 && p_data[1] == 0 && 
170             p_data[2] == 1 && ( p_data[3]&i_mask) == i_startcode )
171         {
172             return( i_pos );
173         }
174     }
175     return( i_pos );
176 }
177
178 static void PESAddDataPacket( pes_packet_t *p_pes, data_packet_t *p_data )
179 {
180     if( !p_pes->p_first )
181     {
182         p_pes->p_first = p_data;
183         p_pes->i_nb_data = 1;
184         p_pes->i_pes_size = p_data->p_payload_end - p_data->p_payload_start;
185     }
186     else
187     {
188         p_pes->p_last->p_next  = p_data;
189         p_pes->i_nb_data++;
190         p_pes->i_pes_size += p_data->p_payload_end - p_data->p_payload_start;
191     }
192     p_pes->p_last  = p_data;
193 }
194
195 static int Demux( input_thread_t * p_input )
196 {
197     demux_sys_t  *p_demux = p_input->p_demux_data;
198     pes_packet_t *p_pes;
199     data_packet_t *p_data;
200     uint8_t *p_peek;
201     int     i_peek;
202     int     i_size;
203     int     i_read;
204     int     b_vop;
205
206     input_ClockManageRef( p_input,
207                           p_input->stream.p_selected_program,
208                           p_demux->i_dts );
209
210     if( (p_pes = input_NewPES( p_input->p_method_data ) ) == NULL )
211     {
212         msg_Err( p_input, "cannot allocate new PES" );
213         return( -1 );
214     }
215
216     /* we will read data into this pes until we found a vop header */
217     for( ; ; )
218     {
219         /* Have a peep at the show. */
220         if( ( i_peek = input_Peek( p_input, &p_peek, 512 ) ) < 5 )
221         {
222             /* Stream shorter than 4 bytes... */
223             msg_Warn( p_input, "cannot peek()" );
224             return( 0 );
225         }
226
227         /* vop startcode */
228         if( ( i_size = FindStartCode( p_peek, i_peek, 0xb6, 0xff ) ) == 0 )
229         {
230             break;
231         }
232
233         if( ( i_read = input_SplitBuffer( p_input,
234                                           &p_data,
235                                           i_size ) ) < 0 )
236         {
237             msg_Warn( p_input, "error while reading data" );
238             break;
239         }
240         PESAddDataPacket( p_pes, p_data );
241     }
242     b_vop = 1;
243     for( ; ; )
244     {
245         /* Have a peep at the show. */
246         if( ( i_peek = input_Peek( p_input, &p_peek, 512 ) ) < 5 )
247         {
248             /* Stream shorter than 4 bytes... */
249             msg_Warn( p_input, "cannot peek()" );
250             return( 0 );
251         }
252
253         /* vop startcode */
254         if( b_vop )
255             i_size = FindStartCode( p_peek + 1, i_peek - 1, 0x00, 0x00 ) + 1;
256         else
257             i_size = FindStartCode( p_peek, i_peek, 0x00, 0x00 );
258         b_vop = 0;
259
260         if( i_size == 0 )
261         {
262             break;
263         }
264
265         if( ( i_read = input_SplitBuffer( p_input,
266                                           &p_data,
267                                           i_size ) ) < 0 )
268         {
269             msg_Warn( p_input, "error while reading data" );
270             break;
271         }
272         PESAddDataPacket( p_pes, p_data );
273     }
274
275     p_pes->i_dts =
276         p_pes->i_pts = input_ClockGetTS( p_input,
277                                          p_input->stream.p_selected_program,
278                                          p_demux->i_dts );
279
280     if( !p_demux->p_es->p_decoder_fifo )
281     {
282         msg_Err( p_input, "no video decoder" );
283         input_DeletePES( p_input->p_method_data, p_pes );
284         return( -1 );
285     }
286     else
287     {
288         input_DecodePES( p_demux->p_es->p_decoder_fifo, p_pes );
289     }
290     /* FIXME FIXME FIXME FIXME */
291     p_demux->i_dts += (mtime_t)90000 / 25;
292     /* FIXME FIXME FIXME FIXME */
293
294     return( 1 );
295 }
296
297