* all: new sout scheme. Now a chain of module are created that can
[vlc.git] / modules / packetizer / a52.c
1 /*****************************************************************************
2  * a52.c
3  *****************************************************************************
4  * Copyright (C) 2001, 2002 VideoLAN
5  * $Id: a52.c,v 1.4 2003/04/13 20:00:21 fenrir Exp $
6  *
7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8  *          Eric Petit <titer@videolan.org>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
23  *****************************************************************************/
24
25 /*****************************************************************************
26  * Preamble
27  *****************************************************************************/
28 #include <vlc/vlc.h>
29 #include <vlc/aout.h>
30 #include <vlc/decoder.h>
31 #include <vlc/input.h>
32 #include <vlc/sout.h>
33
34 #include <stdlib.h>                                      /* malloc(), free() */
35 #include <string.h>                                              /* strdup() */
36 #include "codecs.h"                         /* WAVEFORMATEX BITMAPINFOHEADER */
37 /*****************************************************************************
38  * Local prototypes
39  *****************************************************************************/
40 typedef struct packetizer_s
41 {
42     /* Input properties */
43     decoder_fifo_t          *p_fifo;
44     bit_stream_t            bit_stream;
45
46     /* Output properties */
47     sout_packetizer_input_t *p_sout_input;
48     sout_format_t           output_format;
49
50     uint64_t                i_samplescount;
51
52     mtime_t                 i_last_pts;
53 } packetizer_t;
54
55 static int  Open    ( vlc_object_t * );
56 static int  Run     ( decoder_fifo_t * );
57
58 static int  InitThread     ( packetizer_t * );
59 static void PacketizeThread   ( packetizer_t * );
60 static void EndThread      ( packetizer_t * );
61
62 static int SyncInfo( const byte_t *, int *, int *, int * );
63
64 #define FREE( p ) if( p ) free( p ); p = NULL
65
66 /*****************************************************************************
67  * Module descriptor
68  *****************************************************************************/
69
70 vlc_module_begin();
71     set_description( _("A/52 audio packetizer") );
72     set_capability( "packetizer", 10 );
73     set_callbacks( Open, NULL );
74 vlc_module_end();
75
76
77
78 /*****************************************************************************
79  * OpenDecoder: probe the packetizer and return score
80  *****************************************************************************
81  * Tries to launch a decoder and return score so that the interface is able
82  * to choose.
83  *****************************************************************************/
84 static int Open( vlc_object_t *p_this )
85 {
86     decoder_fifo_t *p_fifo = (decoder_fifo_t*) p_this;
87
88     if( p_fifo->i_fourcc != VLC_FOURCC( 'a', '5', '2', ' ') &&
89         p_fifo->i_fourcc != VLC_FOURCC( 'a', '5', '2', 'b') )
90     {
91         return VLC_EGENERIC;
92     }
93
94     p_fifo->pf_run = Run;
95     return VLC_SUCCESS;
96 }
97
98 /*****************************************************************************
99  * RunDecoder: this function is called just after the thread is created
100  *****************************************************************************/
101 static int Run( decoder_fifo_t *p_fifo )
102 {
103     packetizer_t *p_pack;
104     int b_error;
105
106     msg_Info( p_fifo, "Running A/52 packetizer" );
107     if( !( p_pack = malloc( sizeof( packetizer_t ) ) ) )
108     {
109         msg_Err( p_fifo, "out of memory" );
110         DecoderError( p_fifo );
111         return( -1 );
112     }
113     memset( p_pack, 0, sizeof( packetizer_t ) );
114
115     p_pack->p_fifo = p_fifo;
116
117     if( InitThread( p_pack ) != 0 )
118     {
119         DecoderError( p_fifo );
120         return( -1 );
121     }
122
123     while( ( !p_pack->p_fifo->b_die )&&( !p_pack->p_fifo->b_error ) )
124     {
125         PacketizeThread( p_pack );
126     }
127
128
129     if( ( b_error = p_pack->p_fifo->b_error ) )
130     {
131         DecoderError( p_pack->p_fifo );
132     }
133
134     EndThread( p_pack );
135
136     FREE( p_pack );
137
138     if( b_error )
139     {
140         return( -1 );
141     }
142
143     return( 0 );
144 }
145
146
147
148 /*****************************************************************************
149  * InitThread: initialize data before entering main loop
150  *****************************************************************************/
151
152 static int InitThread( packetizer_t *p_pack )
153 {
154
155     p_pack->output_format.i_cat = AUDIO_ES;
156     p_pack->output_format.i_fourcc = VLC_FOURCC( 'a', '5', '2', ' ' );
157
158     p_pack->p_sout_input   = NULL;
159
160     p_pack->i_samplescount = 0;
161     p_pack->i_last_pts     = 0;
162
163     if( InitBitstream( &p_pack->bit_stream, p_pack->p_fifo,
164                        NULL, NULL ) != VLC_SUCCESS )
165     {
166         msg_Err( p_pack->p_fifo, "cannot initialize bitstream" );
167         return -1;
168     }
169
170     return( 0 );
171 }
172
173 /*****************************************************************************
174  * PacketizeThread: packetize an unit (here copy a complete pes)
175  *****************************************************************************/
176 static void PacketizeThread( packetizer_t *p_pack )
177 {
178     sout_buffer_t   *p_sout_buffer;
179
180
181     uint8_t p_header[7];
182     int     i_channels, i_samplerate, i_bitrate;
183     int     i_framelength;
184     mtime_t i_pts;
185
186     /* search a valid start code */
187     for( ;; )
188     {
189         int i_skip = 0;
190
191         RealignBits( &p_pack->bit_stream );
192         while( ShowBits( &p_pack->bit_stream, 16 ) != 0x0b77 &&
193                !p_pack->p_fifo->b_die && !p_pack->p_fifo->b_error )
194         {
195             RemoveBits( &p_pack->bit_stream, 8 );
196             i_skip++;
197         }
198         if( i_skip )
199         {
200             msg_Warn( p_pack->p_fifo, "trashing %d bytes", i_skip );
201         }
202         if( p_pack->p_fifo->b_die || p_pack->p_fifo->b_error )
203         {
204             return;
205         }
206
207         /* Set the Presentation Time Stamp */
208         NextPTS( &p_pack->bit_stream, &i_pts, NULL );
209
210         GetChunk( &p_pack->bit_stream, p_header, 7 );
211         if( p_pack->p_fifo->b_die ) return;
212
213         /* Check if frame is valid and get frame info */
214         i_framelength = SyncInfo( p_header, &i_channels, &i_samplerate,
215                                   &i_bitrate );
216
217         if( !i_framelength )
218         {
219             msg_Warn( p_pack->p_fifo, "invalid header found" );
220             continue;
221         }
222         else
223         {
224 //            msg_Dbg( p_pack->p_fifo, "frame length %d b", i_framelength );
225             break;
226         }
227     }
228
229     if( !p_pack->p_sout_input )
230     {
231         p_pack->output_format.i_sample_rate = i_samplerate;
232         p_pack->output_format.i_channels    = i_channels;
233         p_pack->output_format.i_block_align = 0;
234         p_pack->output_format.i_bitrate     = 0;
235         p_pack->output_format.i_extra_data  = 0;
236         p_pack->output_format.p_extra_data  = NULL;
237
238         p_pack->p_sout_input =
239             sout_InputNew( p_pack->p_fifo,
240                            &p_pack->output_format );
241
242         if( !p_pack->p_sout_input )
243         {
244             msg_Err( p_pack->p_fifo,
245                      "cannot add a new stream" );
246             p_pack->p_fifo->b_error = 1;
247             return;
248         }
249         msg_Info( p_pack->p_fifo,
250                  "A/52 channels:%d samplerate:%d bitrate:%d",
251                  i_channels, i_samplerate, i_bitrate );
252     }
253
254     if( i_pts <= 0 && p_pack->i_last_pts <= 0 )
255     {
256         msg_Dbg( p_pack->p_fifo, "need a starting pts" );
257         return;
258     }
259
260     /* fix pts */
261     if( i_pts <= 0 )
262     {
263         i_pts = p_pack->i_last_pts +
264                     (uint64_t)1000000 *
265                     (uint64_t)A52_FRAME_NB /
266                     (uint64_t)i_samplerate;
267     }
268     p_pack->i_last_pts = i_pts;
269
270     p_sout_buffer =
271         sout_BufferNew( p_pack->p_sout_input->p_sout, i_framelength );
272     if( !p_sout_buffer )
273     {
274         p_pack->p_fifo->b_error = 1;
275         return;
276     }
277     memcpy( p_sout_buffer->p_buffer, p_header, 7 );
278     p_sout_buffer->i_bitrate = i_bitrate;
279
280     p_sout_buffer->i_pts =
281         p_sout_buffer->i_dts = i_pts;
282
283     p_sout_buffer->i_length =
284             (uint64_t)1000000 *
285             (uint64_t)A52_FRAME_NB /
286             (uint64_t)i_samplerate;
287
288     p_pack->i_samplescount += A52_FRAME_NB;
289
290     /* we are already aligned */
291     GetChunk( &p_pack->bit_stream,
292               p_sout_buffer->p_buffer + 7,
293               i_framelength - 7 );
294
295     sout_InputSendBuffer( p_pack->p_sout_input,
296                           p_sout_buffer );
297 }
298
299
300 /*****************************************************************************
301  * EndThread : packetizer thread destruction
302  *****************************************************************************/
303 static void EndThread ( packetizer_t *p_pack)
304 {
305     if( p_pack->p_sout_input )
306     {
307         sout_InputDelete( p_pack->p_sout_input );
308     }
309 }
310
311 /*****************************************************************************
312  * SyncInfo: parse A52 sync info
313  *****************************************************************************
314  * This code is borrowed from liba52 by Aaron Holtzman & Michel Lespinasse,
315  * since we don't want to oblige S/PDIF people to use liba52 just to get
316  * their SyncInfo...
317  * fenrir: I've change it to report channels count
318  *****************************************************************************/
319 static int SyncInfo( const byte_t * p_buf, int * pi_channels,
320                      int * pi_sample_rate, int * pi_bit_rate )
321 {
322     static const uint8_t halfrate[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3 };
323     static const int rate[] = { 32,  40,  48,  56,  64,  80,  96, 112,
324                                 128, 160, 192, 224, 256, 320, 384, 448,
325                                 512, 576, 640 };
326     static const uint8_t lfeon[8] = { 0x10, 0x10, 0x04, 0x04,
327                                       0x04, 0x01, 0x04, 0x01 };
328     int frmsizecod;
329     int bitrate;
330     int half;
331     int acmod;
332
333     if ((p_buf[0] != 0x0b) || (p_buf[1] != 0x77))        /* syncword */
334         return 0;
335
336     if (p_buf[5] >= 0x60)                /* bsid >= 12 */
337         return 0;
338     half = halfrate[p_buf[5] >> 3];
339
340     /* acmod, dsurmod and lfeon */
341     acmod = p_buf[6] >> 5;
342     if ( (p_buf[6] & 0xf8) == 0x50 )
343     {
344         /* Dolby surround = stereo + Dolby */
345 /*        *pi_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
346                         | AOUT_CHAN_DOLBYSTEREO;*/
347         *pi_channels = 2; /* FIXME ???  */
348     }
349     else switch ( acmod )
350     {
351     case 0x0:
352         /* Dual-mono = stereo + dual-mono */
353 //        *pi_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
354 //                        | AOUT_CHAN_DUALMONO;
355         *pi_channels = 2; /* FIXME ???  */
356         break;
357     case 0x1:
358         /* Mono */
359         *pi_channels = 1;
360         break;
361     case 0x2:
362         /* Stereo */
363         *pi_channels = 2;
364         break;
365     case 0x3: /* 3F */
366     case 0x4: /* 2F1R */
367         *pi_channels = 3;
368         break;
369     case 0x5: /* 3F1R */
370     case 0x6: /* 2F2R */
371         *pi_channels = 4;
372         break;
373     case 0x7:
374         /* 3F2R */
375         *pi_channels = 5;
376         break;
377     default:
378         return 0;
379     }
380
381     if ( p_buf[6] & lfeon[acmod] ) *pi_channels += 1;//|= AOUT_CHAN_LFEA;
382
383     frmsizecod = p_buf[4] & 63;
384     if (frmsizecod >= 38)
385         return 0;
386     bitrate = rate [frmsizecod >> 1];
387     *pi_bit_rate = (bitrate * 1000) >> half;
388
389     switch (p_buf[4] & 0xc0) {
390     case 0:
391         *pi_sample_rate = 48000 >> half;
392         return 4 * bitrate;
393     case 0x40:
394         *pi_sample_rate = 44100 >> half;
395         return 2 * (320 * bitrate / 147 + (frmsizecod & 1));
396     case 0x80:
397         *pi_sample_rate = 32000 >> half;
398         return 6 * bitrate;
399     default:
400         return 0;
401     }
402 }
403
404