1 /*****************************************************************************
2 * input_ext-dec.h: structures exported to the VideoLAN decoders
3 *****************************************************************************
4 * Copyright (C) 1999-2001 VideoLAN
5 * $Id: input_ext-dec.h,v 1.59.2.1 2002/09/25 23:11:51 massiot 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 usage : */
32 #define DVD_SPU_ES 0x82
33 #define LPCM_AUDIO_ES 0x83
34 /* These ones are only here to work around a bug in VLS - VLS doesn't
35 * skip the first bytes of the PES payload (stream private ID) when
36 * streaming. This is incompatible with all equipments. 'B' is for
37 * buggy. Please note that they are associated with FOURCCs '***b'.
40 #define A52B_AUDIO_ES 0x91
41 #define DVDB_SPU_ES 0x92
42 #define LPCMB_AUDIO_ES 0x93
44 #define MSMPEG4v1_VIDEO_ES 0x40
45 #define MSMPEG4v2_VIDEO_ES 0x41
46 #define MSMPEG4v3_VIDEO_ES 0x42
47 #define MPEG4_VIDEO_ES 0x50
49 #define UNKNOWN_ES 0xFF
51 /* Structures exported to the decoders */
53 /*****************************************************************************
55 *****************************************************************************
56 * Describe a data packet.
57 *****************************************************************************/
58 typedef struct data_packet_s
60 /* Used to chain the packets that carry data for a same PES or PSI */
61 struct data_packet_s * p_next;
63 /* start of the PS or TS packet */
64 byte_t * p_demux_start;
65 /* start of the PES payload in this packet */
66 byte_t * p_payload_start;
67 byte_t * p_payload_end; /* guess ? :-) */
68 /* is the packet messed up ? */
69 boolean_t b_discard_payload;
71 /* pointer to the real data */
72 struct data_buffer_s * p_buffer;
75 /*****************************************************************************
77 *****************************************************************************
78 * Describes an PES packet, with its properties, and pointers to the TS packets
80 *****************************************************************************/
81 typedef struct pes_packet_s
83 /* Chained list to the next PES packet (depending on the context) */
84 struct pes_packet_s * p_next;
87 boolean_t b_data_alignment; /* used to find the beginning of
88 * a video or audio unit */
89 boolean_t b_discontinuity; /* This packet doesn't follow the
92 mtime_t i_pts; /* PTS for this packet (zero if unset) */
93 mtime_t i_dts; /* DTS for this packet (zero if unset) */
94 int i_rate; /* current pace of reading
95 * (see stream_control.h) */
97 unsigned int i_pes_size; /* size of the current PES packet */
99 /* Chained list to packets */
100 data_packet_t * p_first; /* The first packet contained by this
101 * PES (used by decoders). */
102 data_packet_t * p_last; /* The last packet contained by this
103 PES (used by the buffer allocator) */
104 unsigned int i_nb_data; /* Number of data packets in the chained
108 /*****************************************************************************
110 *****************************************************************************
111 * This rotative FIFO contains PES packets that are to be decoded.
112 *****************************************************************************/
113 typedef struct decoder_fifo_s
115 /* Thread structures */
116 vlc_mutex_t data_lock; /* fifo data lock */
117 vlc_cond_t data_wait; /* fifo data conditional variable */
120 pes_packet_t * p_first;
121 pes_packet_t ** pp_last;
122 int i_depth; /* number of PES packets in the stack */
124 /* Communication interface between input and decoders */
125 boolean_t b_die; /* the decoder should return now */
126 boolean_t b_error; /* the decoder is in an error loop */
127 struct input_buffers_s *p_packets_mgt; /* packets management services
131 /*****************************************************************************
132 * bit_fifo_t : bit fifo descriptor
133 *****************************************************************************
134 * This type describes a bit fifo used to store bits while working with the
135 * input stream at the bit level.
136 *****************************************************************************/
137 typedef u32 WORD_TYPE;
139 typedef struct bit_fifo_s
141 /* This unsigned integer allows us to work at the bit level. This buffer
142 * can contain 32 bits, and the used space can be found on the MSb's side
143 * and the available space on the LSb's side. */
146 /* Number of bits available in the bit buffer */
151 /*****************************************************************************
152 * bit_stream_t : bit stream descriptor
153 *****************************************************************************
154 * This type, based on a PES stream, includes all the structures needed to
155 * handle the input stream like a bit stream.
156 *****************************************************************************/
157 typedef struct bit_stream_s
167 /* The decoder fifo contains the data of the PES stream */
168 decoder_fifo_t * p_decoder_fifo;
170 /* Callback to the decoder used when changing data packets ; set
171 * to NULL if your decoder doesn't need it. */
172 void (* pf_bitstream_callback)( struct bit_stream_s *,
173 boolean_t b_new_pes );
174 /* Optional argument to the callback */
175 void * p_callback_arg;
180 mtime_t i_pts, i_dts;
181 byte_t * p_pts_validity;
186 /* Current data packet (in the current PES packet of the PES stream) */
187 data_packet_t * p_data;
188 /* Pointer to the next byte that is to be read (in the current packet) */
190 /* Pointer to the last byte that is to be read (in the current packet */
192 /* Temporary buffer in case we're not aligned when changing data packets */
193 WORD_TYPE i_showbits_buffer;
194 data_packet_t showbits_data;
197 /*****************************************************************************
198 * Inline functions used by the decoders to read bit_stream_t
199 *****************************************************************************/
202 * DISCUSSION : How to use the bit_stream structures
204 * sizeof(WORD_TYPE) (usually 32) bits are read at the same time, thus
205 * minimizing the number of p_byte changes.
206 * Bits are read via GetBits() or ShowBits.
208 * XXX : Be aware that if, in the forthcoming functions, i_bits > 24,
209 * the data have to be already aligned on an 8-bit boundary, or wrong
210 * results will be returned. Use RealignBits() if unsure.
213 #if (WORD_TYPE == u32)
214 # define WORD_AT U32_AT
215 # define WORD_SIGNED s32
216 #elif (WORD_TYPE == u64)
217 # define WORD_AT U64_AT
218 # define WORD_SIGNED s64
220 # error Unsupported WORD_TYPE
223 /*****************************************************************************
224 * Prototypes from input_ext-dec.c
225 *****************************************************************************/
227 void InitBitstream ( struct bit_stream_s *, struct decoder_fifo_s *,
228 void (* pf_bitstream_callback)( struct bit_stream_s *,
230 void * p_callback_arg );
231 boolean_t NextDataPacket( struct decoder_fifo_s *, struct data_packet_s ** );
232 void BitstreamNextDataPacket( struct bit_stream_s * );
233 u32 UnalignedShowBits( struct bit_stream_s *, unsigned int );
234 void UnalignedRemoveBits( struct bit_stream_s * );
235 u32 UnalignedGetBits( struct bit_stream_s *, unsigned int );
236 void CurrentPTS( struct bit_stream_s *, mtime_t *, mtime_t * );
238 # define InitBitstream p_symbols->InitBitstream
239 # define NextDataPacket p_symbols->NextDataPacket
240 # define BitstreamNextDataPacket p_symbols->BitstreamNextDataPacket
241 # define UnalignedShowBits p_symbols->UnalignedShowBits
242 # define UnalignedRemoveBits p_symbols->UnalignedRemoveBits
243 # define UnalignedGetBits p_symbols->UnalignedGetBits
244 # define CurrentPTS p_symbols->CurrentPTS
247 /*****************************************************************************
248 * AlignWord : fill in the bit buffer so that the byte pointer be aligned
249 * on a word boundary (XXX: there must be at least sizeof(WORD_TYPE) - 1
250 * empty bytes in the bit buffer)
251 *****************************************************************************/
252 static inline void AlignWord( bit_stream_t * p_bit_stream )
254 while( (ptrdiff_t)p_bit_stream->p_byte
255 & (sizeof(WORD_TYPE) - 1) )
257 if( p_bit_stream->p_byte < p_bit_stream->p_end )
259 p_bit_stream->fifo.buffer |= *(p_bit_stream->p_byte++)
260 << (8 * sizeof(WORD_TYPE) - 8
261 - p_bit_stream->fifo.i_available);
262 p_bit_stream->fifo.i_available += 8;
266 BitstreamNextDataPacket( p_bit_stream );
267 p_bit_stream->fifo.buffer |= *(p_bit_stream->p_byte++)
268 << (8 * sizeof(WORD_TYPE) - 8
269 - p_bit_stream->fifo.i_available);
270 p_bit_stream->fifo.i_available += 8;
275 /*****************************************************************************
276 * ShowBits : return i_bits bits from the bit stream
277 *****************************************************************************/
278 static inline u32 ShowBits( bit_stream_t * p_bit_stream,
279 unsigned int i_bits )
281 if( p_bit_stream->fifo.i_available >= i_bits )
283 return( p_bit_stream->fifo.buffer >> (8 * sizeof(WORD_TYPE) - i_bits) );
286 if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
288 return( (p_bit_stream->fifo.buffer |
289 (WORD_AT( p_bit_stream->p_byte )
290 >> p_bit_stream->fifo.i_available))
291 >> (8 * sizeof(WORD_TYPE) - i_bits) );
294 return( UnalignedShowBits( p_bit_stream, i_bits ) );
297 /*****************************************************************************
298 * ShowSignedBits : return i_bits bits from the bit stream, using signed
300 *****************************************************************************/
301 static inline s32 ShowSignedBits( bit_stream_t * p_bit_stream,
302 unsigned int i_bits )
304 if( p_bit_stream->fifo.i_available >= i_bits )
306 return( (WORD_SIGNED)p_bit_stream->fifo.buffer
307 >> (8 * sizeof(WORD_TYPE) - i_bits) );
310 /* You can probably do something a little faster, but now I'm tired. */
311 return( (WORD_SIGNED)(ShowBits( p_bit_stream, i_bits ) << (32 - i_bits))
315 /*****************************************************************************
316 * RemoveBits : removes i_bits bits from the bit buffer
317 * XXX: do not use for 32 bits, see RemoveBits32
318 *****************************************************************************/
319 static inline void RemoveBits( bit_stream_t * p_bit_stream,
320 unsigned int i_bits )
322 p_bit_stream->fifo.i_available -= i_bits;
324 if( p_bit_stream->fifo.i_available >= 0 )
326 p_bit_stream->fifo.buffer <<= i_bits;
330 if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
332 p_bit_stream->fifo.buffer = WORD_AT( p_bit_stream->p_byte )
333 << ( -p_bit_stream->fifo.i_available );
334 ((WORD_TYPE *)p_bit_stream->p_byte)++;
335 p_bit_stream->fifo.i_available += sizeof(WORD_TYPE) * 8;
339 UnalignedRemoveBits( p_bit_stream );
342 /*****************************************************************************
343 * RemoveBits32 : removes 32 bits from the bit buffer (and as a side effect,
345 *****************************************************************************/
346 #if (WORD_TYPE == u32)
347 static inline void RemoveBits32( bit_stream_t * p_bit_stream )
349 if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
351 if( p_bit_stream->fifo.i_available )
353 p_bit_stream->fifo.buffer = WORD_AT( p_bit_stream->p_byte )
354 << (32 - p_bit_stream->fifo.i_available);
355 ((WORD_TYPE *)p_bit_stream->p_byte)++;
359 ((WORD_TYPE *)p_bit_stream->p_byte)++;
363 p_bit_stream->fifo.i_available -= 32;
364 UnalignedRemoveBits( p_bit_stream );
367 # define RemoveBits32( p_bit_stream ) RemoveBits( p_bit_stream, 32 )
370 /*****************************************************************************
371 * GetBits : returns i_bits bits from the bit stream and removes them
372 * XXX: do not use for 32 bits, see GetBits32
373 *****************************************************************************/
374 static inline u32 GetBits( bit_stream_t * p_bit_stream,
375 unsigned int i_bits )
379 p_bit_stream->fifo.i_available -= i_bits;
381 if( p_bit_stream->fifo.i_available >= 0 )
383 i_result = p_bit_stream->fifo.buffer
384 >> (8 * sizeof(WORD_TYPE) - i_bits);
385 p_bit_stream->fifo.buffer <<= i_bits;
389 if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
391 i_result = p_bit_stream->fifo.buffer
392 >> (8 * sizeof(WORD_TYPE) - i_bits);
393 p_bit_stream->fifo.buffer = WORD_AT( p_bit_stream->p_byte );
394 ((WORD_TYPE *)p_bit_stream->p_byte)++;
395 i_result |= p_bit_stream->fifo.buffer
396 >> (8 * sizeof(WORD_TYPE)
397 + p_bit_stream->fifo.i_available);
398 p_bit_stream->fifo.buffer <<= ( -p_bit_stream->fifo.i_available );
399 p_bit_stream->fifo.i_available += sizeof(WORD_TYPE) * 8;
403 return UnalignedGetBits( p_bit_stream, i_bits );
406 /*****************************************************************************
407 * GetSignedBits : returns i_bits bits from the bit stream and removes them,
408 * using signed arithmetic
409 * XXX: do not use for 32 bits
410 *****************************************************************************/
411 static inline s32 GetSignedBits( bit_stream_t * p_bit_stream,
412 unsigned int i_bits )
414 if( p_bit_stream->fifo.i_available >= i_bits )
418 p_bit_stream->fifo.i_available -= i_bits;
419 i_result = (WORD_SIGNED)p_bit_stream->fifo.buffer
420 >> (8 * sizeof(WORD_TYPE) - i_bits);
421 p_bit_stream->fifo.buffer <<= i_bits;
425 /* You can probably do something a little faster, but now I'm tired. */
426 return( (WORD_SIGNED)(GetBits( p_bit_stream, i_bits ) << (32 - i_bits))
430 /*****************************************************************************
431 * GetBits32 : returns 32 bits from the bit stream and removes them
432 *****************************************************************************/
433 #if (WORD_TYPE == u32)
434 static inline u32 GetBits32( bit_stream_t * p_bit_stream )
438 if( p_bit_stream->fifo.i_available == 32 )
440 p_bit_stream->fifo.i_available = 0;
441 i_result = p_bit_stream->fifo.buffer;
442 p_bit_stream->fifo.buffer = 0;
446 if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
448 if( p_bit_stream->fifo.i_available )
450 i_result = p_bit_stream->fifo.buffer;
451 p_bit_stream->fifo.buffer = WORD_AT( p_bit_stream->p_byte );
452 ((WORD_TYPE *)p_bit_stream->p_byte)++;
453 i_result |= p_bit_stream->fifo.buffer
454 >> (p_bit_stream->fifo.i_available);
455 p_bit_stream->fifo.buffer <<= (32 - p_bit_stream->fifo.i_available);
459 i_result = WORD_AT( p_bit_stream->p_byte );
460 ((WORD_TYPE *)p_bit_stream->p_byte)++;
464 p_bit_stream->fifo.i_available -= 32;
465 return UnalignedGetBits( p_bit_stream, 32 );
468 # define GetBits32( p_bit_stream ) GetBits( p_bit_stream, 32 )
471 /*****************************************************************************
472 * RealignBits : realigns the bit buffer on an 8-bit boundary
473 *****************************************************************************/
474 static inline void RealignBits( bit_stream_t * p_bit_stream )
476 p_bit_stream->fifo.buffer <<= (p_bit_stream->fifo.i_available & 0x7);
477 p_bit_stream->fifo.i_available &= ~0x7;
481 /*****************************************************************************
482 * GetChunk : reads a large chunk of data
483 *****************************************************************************
484 * The position in the stream must be byte-aligned, if unsure call
485 * RealignBits(). p_buffer must point to a buffer at least as big as i_buf_len
486 * otherwise your code will crash.
487 *****************************************************************************/
488 static inline void GetChunk( bit_stream_t * p_bit_stream,
489 byte_t * p_buffer, size_t i_buf_len )
491 ptrdiff_t i_available;
493 /* We need to take care because i_buf_len may be < 4. */
494 while( p_bit_stream->fifo.i_available > 0 && i_buf_len )
496 *p_buffer = p_bit_stream->fifo.buffer >> (8 * sizeof(WORD_TYPE) - 8);
499 p_bit_stream->fifo.buffer <<= 8;
500 p_bit_stream->fifo.i_available -= 8;
503 if( (i_available = p_bit_stream->p_end - p_bit_stream->p_byte)
506 FAST_MEMCPY( p_buffer, p_bit_stream->p_byte, i_buf_len );
507 p_bit_stream->p_byte += i_buf_len;
513 FAST_MEMCPY( p_buffer, p_bit_stream->p_byte, i_available );
514 p_bit_stream->p_byte = p_bit_stream->p_end;
515 p_buffer += i_available;
516 i_buf_len -= i_available;
517 BitstreamNextDataPacket( p_bit_stream );
518 if( p_bit_stream->p_decoder_fifo->b_die )
521 while( (i_available = p_bit_stream->p_end - p_bit_stream->p_byte)
526 FAST_MEMCPY( p_buffer, p_bit_stream->p_byte, i_buf_len );
527 p_bit_stream->p_byte += i_buf_len;
531 if( p_bit_stream->p_byte <= p_bit_stream->p_end - sizeof(WORD_TYPE) )
533 AlignWord( p_bit_stream );
539 * Communication interface between input and decoders
542 /*****************************************************************************
544 *****************************************************************************
545 * Standard pointers given to the decoders as a toolbox.
546 *****************************************************************************/
547 typedef struct decoder_config_s
550 u8 i_type; /* type of the elementary stream */
553 struct stream_ctrl_s * p_stream_ctrl;
554 struct decoder_fifo_s * p_decoder_fifo;
557 /*****************************************************************************
558 * Prototypes from input_dec.c
559 *****************************************************************************/
561 void DecoderError ( struct decoder_fifo_s * p_fifo );
563 # define DecoderError p_symbols->DecoderError