Moves volume icon update in the timer
[vlc.git] / modules / audio_filter / converter / dtstospdif.c
1 /*****************************************************************************
2  * dtstospdif.c : encapsulates DTS frames into S/PDIF packets
3  *****************************************************************************
4  * Copyright (C) 2003, 2006 the VideoLAN team
5  * $Id$
6  *
7  * Authors: Jon Lech Johansen <jon-vl@nanocrew.net>
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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22  *****************************************************************************/
23
24 /*****************************************************************************
25  * Preamble
26  *****************************************************************************/
27 #include <vlc/vlc.h>
28
29
30 #ifdef HAVE_UNISTD_H
31 #   include <unistd.h>
32 #endif
33
34 #include <vlc_aout.h>
35
36 /*****************************************************************************
37  * Local structures
38  *****************************************************************************/
39 struct aout_filter_sys_t
40 {
41     /* 3 DTS frames have to be packed into an S/PDIF frame.
42      * We accumulate DTS frames from the decoder until we have enough to
43      * send. */
44
45     uint8_t *p_buf;
46
47     mtime_t start_date;
48
49     int i_frames;
50     unsigned int i_frame_size;
51 };
52
53 /*****************************************************************************
54  * Local prototypes
55  *****************************************************************************/
56 static int  Create    ( vlc_object_t * );
57 static void Close     ( vlc_object_t * );
58 static void DoWork    ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
59                         aout_buffer_t * );
60
61 /*****************************************************************************
62  * Module descriptor
63  *****************************************************************************/
64 vlc_module_begin();
65     set_category( CAT_AUDIO );
66     set_subcategory( SUBCAT_AUDIO_MISC );
67     set_description( _("Audio filter for DTS->S/PDIF encapsulation") );
68     set_capability( "audio filter", 10 );
69     set_callbacks( Create, Close );
70 vlc_module_end();
71
72 /*****************************************************************************
73  * Create:
74  *****************************************************************************/
75 static int Create( vlc_object_t *p_this )
76 {
77     aout_filter_t * p_filter = (aout_filter_t *)p_this;
78
79     if( p_filter->input.i_format != VLC_FOURCC('d','t','s',' ') ||
80         ( p_filter->output.i_format != VLC_FOURCC('s','p','d','i') &&
81           p_filter->output.i_format != VLC_FOURCC('s','p','d','b') ) )
82     {
83         return -1;
84     }
85
86     /* Allocate the memory needed to store the module's structure */
87     p_filter->p_sys = malloc( sizeof(struct aout_filter_sys_t) );
88     if( p_filter->p_sys == NULL )
89     {
90         msg_Err( p_filter, "out of memory" );
91         return VLC_ENOMEM;
92     }
93     memset( p_filter->p_sys, 0, sizeof(struct aout_filter_sys_t) );
94     p_filter->p_sys->p_buf = 0;
95
96     p_filter->pf_do_work = DoWork;
97     p_filter->b_in_place = 1;
98
99     return 0;
100 }
101
102 /*****************************************************************************
103  * Close: free our resources
104  *****************************************************************************/
105 static void Close( vlc_object_t * p_this )
106 {
107     aout_filter_t * p_filter = (aout_filter_t *)p_this;
108     if( p_filter->p_sys->i_frame_size ) free( p_filter->p_sys->p_buf );
109     free( p_filter->p_sys );
110 }
111
112 /*****************************************************************************
113  * DoWork: convert a buffer
114  *****************************************************************************/
115 static void DoWork( aout_instance_t * p_aout, aout_filter_t * p_filter,
116                     aout_buffer_t * p_in_buf, aout_buffer_t * p_out_buf )
117 {
118     uint32_t i_ac5_spdif_type = 0;
119     uint16_t i_fz = p_in_buf->i_nb_samples * 4;
120     uint16_t i_frame, i_length = p_in_buf->i_nb_bytes;
121     static const uint8_t p_sync_le[6] = { 0x72, 0xF8, 0x1F, 0x4E, 0x00, 0x00 };
122     static const uint8_t p_sync_be[6] = { 0xF8, 0x72, 0x4E, 0x1F, 0x00, 0x00 };
123
124     if( p_in_buf->i_nb_bytes != p_filter->p_sys->i_frame_size )
125     {
126         /* Frame size changed, reset everything */
127         p_filter->p_sys->i_frame_size = p_in_buf->i_nb_bytes;
128         p_filter->p_sys->p_buf = realloc( p_filter->p_sys->p_buf,
129                                           p_in_buf->i_nb_bytes * 3 );
130         p_filter->p_sys->i_frames = 0;
131     }
132
133     /* Backup frame */
134     p_filter->p_libvlc->pf_memcpy( p_filter->p_sys->p_buf + p_in_buf->i_nb_bytes *
135                                 p_filter->p_sys->i_frames, p_in_buf->p_buffer,
136                                 p_in_buf->i_nb_bytes );
137
138     p_filter->p_sys->i_frames++;
139
140     if( p_filter->p_sys->i_frames < 3 )
141     {
142         if( !p_filter->p_sys->i_frames )
143             /* We'll need the starting date */
144             p_filter->p_sys->start_date = p_in_buf->start_date;
145
146         /* Not enough data */
147         p_out_buf->i_nb_samples = 0;
148         p_out_buf->i_nb_bytes = 0;
149         return;
150     }
151
152     p_filter->p_sys->i_frames = 0;
153
154     for( i_frame = 0; i_frame < 3; i_frame++ )
155     {
156         byte_t * p_out = p_out_buf->p_buffer + (i_frame * i_fz);
157         byte_t * p_in = p_filter->p_sys->p_buf + (i_frame * i_length);
158
159         switch( p_in_buf->i_nb_samples )
160         {
161             case  512: i_ac5_spdif_type = 0x0B; break;
162             case 1024: i_ac5_spdif_type = 0x0C; break;
163             case 2048: i_ac5_spdif_type = 0x0D; break;
164         }
165
166         /* Copy the S/PDIF headers. */
167         if( p_filter->output.i_format == VLC_FOURCC('s','p','d','b') )
168         {
169             p_filter->p_libvlc->pf_memcpy( p_out, p_sync_be, 6 );
170             p_out[5] = i_ac5_spdif_type;
171             p_out[6] = (( i_length ) >> 5 ) & 0xFF;
172             p_out[7] = ( i_length << 3 ) & 0xFF;
173         }
174         else
175         {
176             p_filter->p_libvlc->pf_memcpy( p_out, p_sync_le, 6 );
177             p_out[4] = i_ac5_spdif_type;
178             p_out[6] = ( i_length << 3 ) & 0xFF;
179             p_out[7] = (( i_length ) >> 5 ) & 0xFF;
180         }
181
182         if( ( (p_in[0] == 0x1F || p_in[0] == 0x7F) && p_filter->output.i_format == VLC_FOURCC('s','p','d','i') ) ||
183             ( (p_in[0] == 0xFF || p_in[0] == 0xFE) && p_filter->output.i_format == VLC_FOURCC('s','p','d','b') ) )
184         {
185             /* We are dealing with a big endian bitstream and a little endian output
186              * or a little endian bitstream and a big endian output.
187              * Byteswap the stream */
188 #ifdef HAVE_SWAB
189             swab( p_in, p_out + 8, i_length );
190 #else
191             uint16_t i;
192             byte_t * p_tmp, tmp;
193             p_tmp = p_out + 8;
194             for( i = i_length / 2 ; i-- ; )
195             {
196                 tmp = p_in[0]; /* in-place filter */
197                 p_tmp[0] = p_in[1];
198                 p_tmp[1] = tmp;
199                 p_tmp += 2; p_in += 2;
200             }
201 #endif
202         }
203         else
204         {
205             p_filter->p_libvlc->pf_memcpy( p_out + 8, p_in, i_length );
206         }
207
208         if( i_fz > i_length + 8 )
209         {
210             p_filter->p_libvlc->pf_memset( p_out + 8 + i_length, 0,
211                                         i_fz - i_length - 8 );
212         }
213     }
214
215     p_out_buf->start_date = p_filter->p_sys->start_date;
216     p_out_buf->i_nb_samples = p_in_buf->i_nb_samples * 3;
217     p_out_buf->i_nb_bytes = p_out_buf->i_nb_samples * 4;
218 }