]> git.sesse.net Git - vlc/blob - modules/audio_filter/converter/dtstospdif.c
Merge commit 'origin/1.0-bugfix'
[vlc] / 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 #ifdef HAVE_CONFIG_H
28 # include "config.h"
29 #endif
30
31 #include <vlc_common.h>
32 #include <vlc_plugin.h>
33
34
35 #ifdef HAVE_UNISTD_H
36 #   include <unistd.h>
37 #endif
38
39 #include <vlc_aout.h>
40
41 /*****************************************************************************
42  * Local structures
43  *****************************************************************************/
44 struct aout_filter_sys_t
45 {
46     /* 3 DTS frames have to be packed into an S/PDIF frame.
47      * We accumulate DTS frames from the decoder until we have enough to
48      * send. */
49
50     uint8_t *p_buf;
51
52     mtime_t start_date;
53
54     int i_frames;
55     unsigned int i_frame_size;
56 };
57
58 /*****************************************************************************
59  * Local prototypes
60  *****************************************************************************/
61 static int  Create    ( vlc_object_t * );
62 static void Close     ( vlc_object_t * );
63 static void DoWork    ( aout_instance_t *, aout_filter_t *, aout_buffer_t *,
64                         aout_buffer_t * );
65
66 /*****************************************************************************
67  * Module descriptor
68  *****************************************************************************/
69 vlc_module_begin ()
70     set_category( CAT_AUDIO )
71     set_subcategory( SUBCAT_AUDIO_MISC )
72     set_description( N_("Audio filter for DTS->S/PDIF encapsulation") )
73     set_capability( "audio filter", 10 )
74     set_callbacks( Create, Close )
75 vlc_module_end ()
76
77 /*****************************************************************************
78  * Create:
79  *****************************************************************************/
80 static int Create( vlc_object_t *p_this )
81 {
82     aout_filter_t * p_filter = (aout_filter_t *)p_this;
83
84     if( p_filter->input.i_format != VLC_CODEC_DTS ||
85         ( p_filter->output.i_format != VLC_CODEC_SPDIFL &&
86           p_filter->output.i_format != VLC_CODEC_SPDIFB ) )
87     {
88         return -1;
89     }
90
91     /* Allocate the memory needed to store the module's structure */
92     p_filter->p_sys = calloc( 1, sizeof(struct aout_filter_sys_t) );
93     if( !p_filter->p_sys )
94         return VLC_ENOMEM;
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         msg_Warn( p_aout, "Frame size changed from %u to %u, "
128                           "resetting everything.",
129                   p_filter->p_sys->i_frame_size,
130                   (unsigned)p_in_buf->i_nb_bytes );
131
132         p_filter->p_sys->i_frame_size = p_in_buf->i_nb_bytes;
133         p_filter->p_sys->p_buf = realloc( p_filter->p_sys->p_buf,
134                                           p_in_buf->i_nb_bytes * 3 );
135         p_filter->p_sys->i_frames = 0;
136     }
137
138     /* Backup frame */
139     vlc_memcpy( p_filter->p_sys->p_buf + p_in_buf->i_nb_bytes *
140                   p_filter->p_sys->i_frames,
141                 p_in_buf->p_buffer, p_in_buf->i_nb_bytes );
142
143     p_filter->p_sys->i_frames++;
144
145     if( p_filter->p_sys->i_frames < 3 )
146     {
147         if( p_filter->p_sys->i_frames == 1 )
148             /* We'll need the starting date */
149             p_filter->p_sys->start_date = p_in_buf->start_date;
150
151         /* Not enough data */
152         p_out_buf->i_nb_samples = 0;
153         p_out_buf->i_nb_bytes = 0;
154         return;
155     }
156
157     p_filter->p_sys->i_frames = 0;
158
159     for( i_frame = 0; i_frame < 3; i_frame++ )
160     {
161         uint16_t i_length_padded = i_length;
162         uint8_t * p_out = p_out_buf->p_buffer + (i_frame * i_fz);
163         uint8_t * p_in = p_filter->p_sys->p_buf + (i_frame * i_length);
164
165         switch( p_in_buf->i_nb_samples )
166         {
167             case  512: i_ac5_spdif_type = 0x0B; break;
168             case 1024: i_ac5_spdif_type = 0x0C; break;
169             case 2048: i_ac5_spdif_type = 0x0D; break;
170         }
171
172         /* Copy the S/PDIF headers. */
173         if( p_filter->output.i_format == VLC_CODEC_SPDIFB )
174         {
175             vlc_memcpy( p_out, p_sync_be, 6 );
176             p_out[5] = i_ac5_spdif_type;
177             p_out[6] = (( i_length ) >> 5 ) & 0xFF;
178             p_out[7] = ( i_length << 3 ) & 0xFF;
179         }
180         else
181         {
182             vlc_memcpy( p_out, p_sync_le, 6 );
183             p_out[4] = i_ac5_spdif_type;
184             p_out[6] = ( i_length << 3 ) & 0xFF;
185             p_out[7] = (( i_length ) >> 5 ) & 0xFF;
186         }
187
188         if( ( (p_in[0] == 0x1F || p_in[0] == 0x7F) && p_filter->output.i_format == VLC_CODEC_SPDIFL ) ||
189             ( (p_in[0] == 0xFF || p_in[0] == 0xFE) && p_filter->output.i_format == VLC_CODEC_SPDIFB ) )
190         {
191             /* We are dealing with a big endian bitstream and a little endian output
192              * or a little endian bitstream and a big endian output.
193              * Byteswap the stream */
194             swab( p_in, p_out + 8, i_length );
195
196             /* If i_length is odd, we have to adjust swapping a bit.. */
197             if( i_length & 1 )
198             {
199                 p_out[8+i_length-1] = 0;
200                 p_out[8+i_length] = p_in[i_length-1];
201                 i_length_padded++;
202             }
203         }
204         else
205         {
206             vlc_memcpy( p_out + 8, p_in, i_length );
207         }
208
209         if( i_fz > i_length + 8 )
210         {
211             vlc_memset( p_out + 8 + i_length_padded, 0,
212                         i_fz - i_length_padded - 8 );
213         }
214     }
215
216     p_out_buf->start_date = p_filter->p_sys->start_date;
217     p_out_buf->i_nb_samples = p_in_buf->i_nb_samples * 3;
218     p_out_buf->i_nb_bytes = p_out_buf->i_nb_samples * 4;
219 }