1 /*****************************************************************************
2 * input_ext-dec.h: structures exported to the VideoLAN decoders
3 *****************************************************************************
4 * Copyright (C) 1999, 2000 VideoLAN
5 * $Id: input_ext-dec.h,v 1.42 2001/12/10 04:53:10 sam Exp $
7 * Authors: Christophe Massiot <massiot@via.ecp.fr>
8 * Michel Kaempf <maxx@via.ecp.fr>
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.
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.
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 *****************************************************************************/
25 /* ES streams types - see ISO/IEC 13818-1 table 2-29 numbers */
26 #define MPEG1_VIDEO_ES 0x01
27 #define MPEG2_VIDEO_ES 0x02
28 #define MPEG1_AUDIO_ES 0x03
29 #define MPEG2_AUDIO_ES 0x04
30 #define AC3_AUDIO_ES 0x81
31 /* These ones might violate the norm : */
32 #define DVD_SPU_ES 0x82
33 #define LPCM_AUDIO_ES 0x83
34 #define UNKNOWN_ES 0xFF
36 /* Structures exported to the decoders */
38 /*****************************************************************************
40 *****************************************************************************
41 * Describe a data packet.
42 *****************************************************************************/
43 typedef struct data_packet_s
45 /* Nothing before this line, the code relies on that */
46 byte_t * p_buffer; /* raw data packet */
47 long l_size; /* buffer size */
49 /* Decoders information */
50 byte_t * p_payload_start;
51 /* start of the PES payload in this packet */
52 byte_t * p_payload_end; /* guess ? :-) */
53 boolean_t b_discard_payload; /* is the packet messed up ? */
57 /* Used to chain the TS packets that carry data for a same PES or PSI */
58 struct data_packet_s * p_next;
61 /*****************************************************************************
63 *****************************************************************************
64 * Describes an PES packet, with its properties, and pointers to the TS packets
66 *****************************************************************************/
67 typedef struct pes_packet_s
70 boolean_t b_data_alignment; /* used to find the beginning of
71 * a video or audio unit */
72 boolean_t b_discontinuity; /* This packet doesn't follow the
75 mtime_t i_pts; /* PTS for this packet (zero if unset) */
76 mtime_t i_dts; /* DTS for this packet (zero if unset) */
77 int i_rate; /* current pace of reading
78 * (see stream_control.h) */
80 int i_pes_size; /* size of the current PES packet */
82 /* Pointers to packets (packets are then linked by the p_prev and
83 p_next fields of the data_packet_t struct) */
84 data_packet_t * p_first; /* The first packet contained by this
85 * PES (used by decoders). */
88 /*****************************************************************************
90 *****************************************************************************
91 * This rotative FIFO contains PES packets that are to be decoded.
92 *****************************************************************************/
93 typedef struct decoder_fifo_s
95 /* Thread structures */
96 vlc_mutex_t data_lock; /* fifo data lock */
97 vlc_cond_t data_wait; /* fifo data conditional variable */
100 pes_packet_t * buffer[FIFO_SIZE + 1];
104 /* Communication interface between input and decoders */
105 boolean_t b_die; /* the decoder should return now */
106 boolean_t b_error; /* the decoder is in an error loop */
107 void * p_packets_mgt; /* packets management services
108 * data (netlist...) */
109 void (* pf_delete_pes)( void *, pes_packet_t * );
110 /* function to use when releasing a PES */
113 /* Macros to manage a decoder_fifo_t structure. Please remember to take
114 * data_lock before using them. */
115 #define DECODER_FIFO_ISEMPTY( fifo ) ( (fifo).i_start == (fifo).i_end )
116 #define DECODER_FIFO_ISFULL( fifo ) ( ( ((fifo).i_end + 1 - (fifo).i_start)\
118 #define DECODER_FIFO_START( fifo ) ( (fifo).buffer[ (fifo).i_start ] )
119 #define DECODER_FIFO_INCSTART( fifo ) ( (fifo).i_start = ((fifo).i_start + 1)\
121 #define DECODER_FIFO_END( fifo ) ( (fifo).buffer[ (fifo).i_end ] )
122 #define DECODER_FIFO_INCEND( fifo ) ( (fifo).i_end = ((fifo).i_end + 1) \
125 /*****************************************************************************
126 * bit_fifo_t : bit fifo descriptor
127 *****************************************************************************
128 * This type describes a bit fifo used to store bits while working with the
129 * input stream at the bit level.
130 *****************************************************************************/
131 typedef u32 WORD_TYPE;
133 typedef struct bit_fifo_s
135 /* This unsigned integer allows us to work at the bit level. This buffer
136 * can contain 32 bits, and the used space can be found on the MSb's side
137 * and the available space on the LSb's side. */
140 /* Number of bits available in the bit buffer */
145 /*****************************************************************************
146 * bit_stream_t : bit stream descriptor
147 *****************************************************************************
148 * This type, based on a PES stream, includes all the structures needed to
149 * handle the input stream like a bit stream.
150 *****************************************************************************/
151 typedef struct bit_stream_s
161 /* The decoder fifo contains the data of the PES stream */
162 decoder_fifo_t * p_decoder_fifo;
164 /* Function to jump to the next data packet */
165 void (* pf_next_data_packet)( struct bit_stream_s * );
167 /* Callback to the decoder used when changing data packets ; set
168 * to NULL if your decoder doesn't need it. */
169 void (* pf_bitstream_callback)( struct bit_stream_s *,
170 boolean_t b_new_pes );
171 /* Optional argument to the callback */
172 void * p_callback_arg;
177 /* Current data packet (in the current PES packet of the PES stream) */
178 data_packet_t * p_data;
179 /* Pointer to the next byte that is to be read (in the current packet) */
181 /* Pointer to the last byte that is to be read (in the current packet */
183 /* Temporary buffer in case we're not aligned when changing data packets */
184 WORD_TYPE i_showbits_buffer;
185 data_packet_t showbits_data;
188 /*****************************************************************************
189 * Inline functions used by the decoders to read bit_stream_t
190 *****************************************************************************/
193 * DISCUSSION : How to use the bit_stream structures
195 * sizeof(WORD_TYPE) (usually 32) bits are read at the same time, thus
196 * minimizing the number of p_byte changes.
197 * Bits are read via GetBits() or ShowBits.
199 * XXX : Be aware that if, in the forthcoming functions, i_bits > 24,
200 * the data have to be already aligned on an 8-bit boundary, or wrong
201 * results will be returned. Use RealignBits() if unsure.
204 #if (WORD_TYPE == u32)
205 # define WORD_AT U32_AT
206 # define WORD_SIGNED s32
207 #elif (WORD_TYPE == u64)
208 # define WORD_AT U64_AT
209 # define WORD_SIGNED s64
211 # error Unsupported WORD_TYPE
214 /*****************************************************************************
215 * Protoypes from input_ext-dec.c
216 *****************************************************************************/
218 u32 UnalignedShowBits( struct bit_stream_s *, unsigned int );
219 void UnalignedRemoveBits( struct bit_stream_s * );
220 u32 UnalignedGetBits( struct bit_stream_s *, unsigned int );
222 # define UnalignedShowBits p_symbols->UnalignedShowBits
223 # define UnalignedRemoveBits p_symbols->UnalignedRemoveBits
224 # define UnalignedGetBits p_symbols->UnalignedGetBits
227 /*****************************************************************************
228 * AlignWord : fill in the bit buffer so that the byte pointer be aligned
229 * on a word boundary (XXX: there must be at least sizeof(WORD_TYPE) - 1
230 * empty bytes in the bit buffer)
231 *****************************************************************************/
232 static __inline__ void AlignWord( bit_stream_t * p_bit_stream )
234 while( (ptrdiff_t)p_bit_stream->p_byte
235 & (sizeof(WORD_TYPE) - 1) )
237 if( p_bit_stream->p_byte < p_bit_stream->p_end )
239 p_bit_stream->fifo.buffer |= *(p_bit_stream->p_byte++)
240 << (8 * sizeof(WORD_TYPE) - 8
241 - p_bit_stream->fifo.i_available);
242 p_bit_stream->fifo.i_available += 8;
246 p_bit_stream->pf_next_data_packet( p_bit_stream );
247 p_bit_stream->fifo.buffer |= *(p_bit_stream->p_byte++)
248 << (8 * sizeof(WORD_TYPE) - 8
249 - p_bit_stream->fifo.i_available);
250 p_bit_stream->fifo.i_available += 8;
255 /*****************************************************************************
256 * ShowBits : return i_bits bits from the bit stream
257 *****************************************************************************/
258 static __inline__ u32 ShowBits( bit_stream_t * p_bit_stream,
259 unsigned int i_bits )
261 if( p_bit_stream->fifo.i_available >= i_bits )
263 return( p_bit_stream->fifo.buffer >> (8 * sizeof(WORD_TYPE) - i_bits) );
266 if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
268 return( (p_bit_stream->fifo.buffer |
269 (WORD_AT( p_bit_stream->p_byte )
270 >> p_bit_stream->fifo.i_available))
271 >> (8 * sizeof(WORD_TYPE) - i_bits) );
274 return( UnalignedShowBits( p_bit_stream, i_bits ) );
277 /*****************************************************************************
278 * ShowSignedBits : return i_bits bits from the bit stream, using signed
280 *****************************************************************************/
281 static __inline__ s32 ShowSignedBits( bit_stream_t * p_bit_stream,
282 unsigned int i_bits )
284 if( p_bit_stream->fifo.i_available >= i_bits )
286 return( (WORD_SIGNED)p_bit_stream->fifo.buffer
287 >> (8 * sizeof(WORD_TYPE) - i_bits) );
290 /* You can probably do something a little faster, but now I'm tired. */
291 return( (WORD_SIGNED)(ShowBits( p_bit_stream, i_bits ) << (32 - i_bits))
295 /*****************************************************************************
296 * RemoveBits : removes i_bits bits from the bit buffer
297 * XXX: do not use for 32 bits, see RemoveBits32
298 *****************************************************************************/
299 static __inline__ void RemoveBits( bit_stream_t * p_bit_stream,
300 unsigned int i_bits )
302 p_bit_stream->fifo.i_available -= i_bits;
304 if( p_bit_stream->fifo.i_available >= 0 )
306 p_bit_stream->fifo.buffer <<= i_bits;
310 if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
312 p_bit_stream->fifo.buffer = WORD_AT( p_bit_stream->p_byte )
313 << ( -p_bit_stream->fifo.i_available );
314 ((WORD_TYPE *)p_bit_stream->p_byte)++;
315 p_bit_stream->fifo.i_available += sizeof(WORD_TYPE) * 8;
319 UnalignedRemoveBits( p_bit_stream );
322 /*****************************************************************************
323 * RemoveBits32 : removes 32 bits from the bit buffer (and as a side effect,
325 *****************************************************************************/
326 #if (WORD_TYPE == u32)
327 static __inline__ void RemoveBits32( bit_stream_t * p_bit_stream )
329 if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
331 if( p_bit_stream->fifo.i_available )
333 p_bit_stream->fifo.buffer = WORD_AT( p_bit_stream->p_byte )
334 << (32 - p_bit_stream->fifo.i_available);
335 ((WORD_TYPE *)p_bit_stream->p_byte)++;
339 ((WORD_TYPE *)p_bit_stream->p_byte)++;
343 p_bit_stream->fifo.i_available -= 32;
344 UnalignedRemoveBits( p_bit_stream );
347 # define RemoveBits32( p_bit_stream ) RemoveBits( p_bit_stream, 32 )
350 /*****************************************************************************
351 * GetBits : returns i_bits bits from the bit stream and removes them
352 * XXX: do not use for 32 bits, see GetBits32
353 *****************************************************************************/
354 static __inline__ u32 GetBits( bit_stream_t * p_bit_stream,
355 unsigned int i_bits )
359 p_bit_stream->fifo.i_available -= i_bits;
361 if( p_bit_stream->fifo.i_available >= 0 )
363 i_result = p_bit_stream->fifo.buffer
364 >> (8 * sizeof(WORD_TYPE) - i_bits);
365 p_bit_stream->fifo.buffer <<= i_bits;
369 if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
371 i_result = p_bit_stream->fifo.buffer
372 >> (8 * sizeof(WORD_TYPE) - i_bits);
373 p_bit_stream->fifo.buffer = WORD_AT( p_bit_stream->p_byte );
374 ((WORD_TYPE *)p_bit_stream->p_byte)++;
375 i_result |= p_bit_stream->fifo.buffer
376 >> (8 * sizeof(WORD_TYPE)
377 + p_bit_stream->fifo.i_available);
378 p_bit_stream->fifo.buffer <<= ( -p_bit_stream->fifo.i_available );
379 p_bit_stream->fifo.i_available += sizeof(WORD_TYPE) * 8;
383 return UnalignedGetBits( p_bit_stream, i_bits );
386 /*****************************************************************************
387 * GetSignedBits : returns i_bits bits from the bit stream and removes them,
388 * using signed arithmetic
389 * XXX: do not use for 32 bits
390 *****************************************************************************/
391 static __inline__ s32 GetSignedBits( bit_stream_t * p_bit_stream,
392 unsigned int i_bits )
394 if( p_bit_stream->fifo.i_available >= i_bits )
398 p_bit_stream->fifo.i_available -= i_bits;
399 i_result = (WORD_SIGNED)p_bit_stream->fifo.buffer
400 >> (8 * sizeof(WORD_TYPE) - i_bits);
401 p_bit_stream->fifo.buffer <<= i_bits;
405 /* You can probably do something a little faster, but now I'm tired. */
406 return( (WORD_SIGNED)(GetBits( p_bit_stream, i_bits ) << (32 - i_bits))
410 /*****************************************************************************
411 * GetBits32 : returns 32 bits from the bit stream and removes them
412 *****************************************************************************/
413 #if (WORD_TYPE == u32)
414 static __inline__ u32 GetBits32( bit_stream_t * p_bit_stream )
418 if( p_bit_stream->fifo.i_available == 32 )
420 p_bit_stream->fifo.i_available = 0;
421 i_result = p_bit_stream->fifo.buffer;
422 p_bit_stream->fifo.buffer = 0;
426 if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
428 if( p_bit_stream->fifo.i_available )
430 i_result = p_bit_stream->fifo.buffer;
431 p_bit_stream->fifo.buffer = WORD_AT( p_bit_stream->p_byte );
432 ((WORD_TYPE *)p_bit_stream->p_byte)++;
433 i_result |= p_bit_stream->fifo.buffer
434 >> (p_bit_stream->fifo.i_available);
435 p_bit_stream->fifo.buffer <<= (32 - p_bit_stream->fifo.i_available);
439 i_result = WORD_AT( p_bit_stream->p_byte );
440 ((WORD_TYPE *)p_bit_stream->p_byte)++;
444 p_bit_stream->fifo.i_available -= 32;
445 return UnalignedGetBits( p_bit_stream, 32 );
448 # define GetBits32( p_bit_stream ) GetBits( p_bit_stream, 32 )
451 /*****************************************************************************
452 * RealignBits : realigns the bit buffer on an 8-bit boundary
453 *****************************************************************************/
454 static __inline__ void RealignBits( bit_stream_t * p_bit_stream )
456 p_bit_stream->fifo.buffer <<= (p_bit_stream->fifo.i_available & 0x7);
457 p_bit_stream->fifo.i_available &= ~0x7;
461 /*****************************************************************************
462 * GetChunk : reads a large chunk of data
463 *****************************************************************************
464 * The position in the stream must be byte-aligned, if unsure call
465 * RealignBits(). p_buffer must point to a buffer at least as big as i_buf_len
466 * otherwise your code will crash.
467 *****************************************************************************/
468 static __inline__ void GetChunk( bit_stream_t * p_bit_stream,
469 byte_t * p_buffer, size_t i_buf_len )
471 ptrdiff_t i_available;
473 /* We need to take care because i_buf_len may be < 4. */
474 while( p_bit_stream->fifo.i_available > 0 && i_buf_len )
476 *p_buffer = p_bit_stream->fifo.buffer >> (8 * sizeof(WORD_TYPE) - 8);
479 p_bit_stream->fifo.buffer <<= 8;
480 p_bit_stream->fifo.i_available -= 8;
483 if( (i_available = p_bit_stream->p_end - p_bit_stream->p_byte)
486 p_main->fast_memcpy( p_buffer, p_bit_stream->p_byte, i_buf_len );
487 p_bit_stream->p_byte += i_buf_len;
493 p_main->fast_memcpy( p_buffer, p_bit_stream->p_byte, i_available );
494 p_bit_stream->p_byte = p_bit_stream->p_end;
495 p_buffer += i_available;
496 i_buf_len -= i_available;
497 p_bit_stream->pf_next_data_packet( p_bit_stream );
499 while( (i_available = p_bit_stream->p_end - p_bit_stream->p_byte)
500 <= i_buf_len && !p_bit_stream->p_decoder_fifo->b_die );
504 p_main->fast_memcpy( p_buffer, p_bit_stream->p_byte, i_buf_len );
505 p_bit_stream->p_byte += i_buf_len;
509 if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
511 AlignWord( p_bit_stream );
517 * Communication interface between input and decoders
520 /*****************************************************************************
522 *****************************************************************************
523 * Standard pointers given to the decoders as a toolbox.
524 *****************************************************************************/
525 typedef struct decoder_config_s
528 u8 i_type; /* type of the elementary stream */
530 struct stream_ctrl_s * p_stream_ctrl;
531 struct decoder_fifo_s * p_decoder_fifo;
532 void (* pf_init_bit_stream)( struct bit_stream_s *,
533 struct decoder_fifo_s *,
534 void (* pf_bitstream_callback)( struct bit_stream_s *,