1 /*****************************************************************************
2 * pes.c: PES packetizer used by the MPEG multiplexers
3 *****************************************************************************
4 * Copyright (C) 2001, 2002 the VideoLAN team
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8 * Eric Petit <titer@videolan.org>
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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
33 #include <sys/types.h>
38 #include <vlc_common.h>
40 #include <vlc_block.h>
46 #include <vlc_codecs.h>
50 /** PESHeader, write a pes header
51 * \param i_es_size length of payload data. (Must be < PES_PAYLOAD_SIZE_MAX
52 * unless the conditions for unbounded PES packets are met)
53 * \param i_header_size length of padding data to insert into PES packet
56 static inline int PESHeader( uint8_t *p_hdr, mtime_t i_pts, mtime_t i_dts,
57 int i_es_size, es_format_t *p_fmt,
58 int i_stream_id, int i_private_id,
59 bool b_mpeg2, bool b_data_alignment,
65 /* For PES_PRIVATE_STREAM_1 there is an extra header after the
67 /* i_private_id != -1 because TS use 0xbd without private_id */
68 if( i_stream_id == PES_PRIVATE_STREAM_1 && i_private_id != -1 )
71 if( ( i_private_id & 0xf0 ) == 0x80 )
77 bits_initwrite( &bits, 50, p_hdr );
80 bits_write( &bits, 24, 0x01 );
81 bits_write( &bits, 8, i_stream_id );
84 case PES_PROGRAM_STREAM_MAP:
86 case PES_PRIVATE_STREAM_2:
89 case PES_PROGRAM_STREAM_DIRECTORY:
90 case PES_DSMCC_STREAM:
91 case PES_ITU_T_H222_1_TYPE_E_STREAM:
92 /* add pes data size */
93 bits_write( &bits, 16, i_es_size );
95 return( bits.i_data );
98 /* arg, a little more difficult */
103 if( i_pts > 0 && i_dts > 0 &&
104 ( i_pts != i_dts || ( p_fmt->i_cat == VIDEO_ES &&
105 p_fmt->i_codec != VLC_FOURCC('m','p','g','v') ) ) )
108 if ( !i_header_size ) i_header_size = 0xa;
113 if ( !i_header_size ) i_header_size = 0x5;
118 if ( !i_header_size ) i_header_size = 0x0;
121 /* Unbounded streams are only allowed in TS (not PS) and only
122 * for some ES, eg. MPEG* Video ES or Dirac ES. */
123 if( i_es_size > PES_PAYLOAD_SIZE_MAX )
124 bits_write( &bits, 16, 0 ); // size unbounded
126 bits_write( &bits, 16, i_es_size + i_extra + 3
127 + i_header_size ); // size
128 bits_write( &bits, 2, 0x02 ); // mpeg2 id
129 bits_write( &bits, 2, 0x00 ); // pes scrambling control
130 bits_write( &bits, 1, 0x00 ); // pes priority
131 bits_write( &bits, 1, b_data_alignment ); // data alignement indicator
132 bits_write( &bits, 1, 0x00 ); // copyright
133 bits_write( &bits, 1, 0x00 ); // original or copy
135 bits_write( &bits, 2, i_pts_dts ); // pts_dts flags
136 bits_write( &bits, 1, 0x00 ); // escr flags
137 bits_write( &bits, 1, 0x00 ); // es rate flag
138 bits_write( &bits, 1, 0x00 ); // dsm trick mode flag
139 bits_write( &bits, 1, 0x00 ); // additional copy info flag
140 bits_write( &bits, 1, 0x00 ); // pes crc flag
141 bits_write( &bits, 1, 0x00 ); // pes extension flags
142 bits_write( &bits, 8, i_header_size ); // header size -> pts and dts
145 if( i_pts_dts & 0x02 )
147 bits_write( &bits, 4, i_pts_dts ); // '0010' or '0011'
148 bits_write( &bits, 3, i_pts >> 30 );
149 bits_write( &bits, 1, 0x01 ); // marker
150 bits_write( &bits, 15, i_pts >> 15 );
151 bits_write( &bits, 1, 0x01 ); // marker
152 bits_write( &bits, 15, i_pts );
153 bits_write( &bits, 1, 0x01 ); // marker
154 i_header_size -= 0x5;
157 if( i_pts_dts & 0x01 )
159 bits_write( &bits, 4, 0x01 ); // '0001'
160 bits_write( &bits, 3, i_dts >> 30 );
161 bits_write( &bits, 1, 0x01 ); // marker
162 bits_write( &bits, 15, i_dts >> 15 );
163 bits_write( &bits, 1, 0x01 ); // marker
164 bits_write( &bits, 15, i_dts );
165 bits_write( &bits, 1, 0x01 ); // marker
166 i_header_size -= 0x5;
168 while ( i_header_size )
170 bits_write( &bits, 8, 0xff );
178 if( i_pts > 0 && i_dts > 0 &&
179 ( i_pts != i_dts || p_fmt->i_cat == VIDEO_ES ) )
181 bits_write( &bits, 16, i_es_size + i_extra + 10 /* + stuffing */ );
186 bits_write( &bits, 16, i_es_size + i_extra + 5 /* + stuffing */ );
191 bits_write( &bits, 16, i_es_size + i_extra + 1 /* + stuffing */);
195 /* FIXME: Now should be stuffing */
197 /* No STD_buffer_scale and STD_buffer_size */
200 if( i_pts_dts & 0x02 )
202 bits_write( &bits, 4, i_pts_dts ); // '0010' or '0011'
203 bits_write( &bits, 3, i_pts >> 30 );
204 bits_write( &bits, 1, 0x01 ); // marker
205 bits_write( &bits, 15, i_pts >> 15 );
206 bits_write( &bits, 1, 0x01 ); // marker
207 bits_write( &bits, 15, i_pts );
208 bits_write( &bits, 1, 0x01 ); // marker
211 if( i_pts_dts & 0x01 )
213 bits_write( &bits, 4, 0x01 ); // '0001'
214 bits_write( &bits, 3, i_dts >> 30 );
215 bits_write( &bits, 1, 0x01 ); // marker
216 bits_write( &bits, 15, i_dts >> 15 );
217 bits_write( &bits, 1, 0x01 ); // marker
218 bits_write( &bits, 15, i_dts );
219 bits_write( &bits, 1, 0x01 ); // marker
223 bits_write( &bits, 8, 0x0F );
228 /* now should be stuffing */
229 /* and then pes data */
232 if( i_stream_id == PES_PRIVATE_STREAM_1 && i_private_id != -1 )
234 bits_write( &bits, 8, i_private_id );
235 if( ( i_private_id&0xf0 ) == 0x80 )
237 bits_write( &bits, 24, 0 ); // ac3
241 return( bits.i_data );
245 /** EStoPES, encapsulate an elementary stream block into PES packet(s)
246 * each with a maximal payload size of @i_max_pes_size@.
248 * In some circumstances, unbounded PES packets are allowed:
249 * - Transport streams only (NOT programme streams)
250 * - Only some types of elementary streams (eg MPEG2 video)
251 * It is the responsibility of the caller to enforce these constraints.
253 * EStoPES will only produce an unbounded PES packet if:
255 * - i_max_pes_size > PES_PAYLOAD_SIZE_MAX
256 * - length of p_es > PES_PAYLOAD_SIZE_MAX
257 * If the last condition is not met, a single PES packet is produced
258 * which is not unbounded in length.
260 * \param i_header_size length of padding data to insert into PES packet
262 * \param i_max_pes_size maximum length of each pes packet payload.
263 * if zero, uses default maximum.
264 * To allow unbounded PES packets in transport stream
265 * VIDEO_ES, set to INT_MAX.
267 int EStoPES ( sout_instance_t *p_sout, block_t **pp_pes, block_t *p_es,
268 es_format_t *p_fmt, int i_stream_id,
269 int b_mpeg2, int b_data_alignment, int i_header_size,
273 mtime_t i_pts, i_dts, i_length;
278 int i_private_id = -1;
280 uint8_t header[50]; // PES header + extra < 50 (more like 17)
286 /* NB, Only video ES may have unbounded length */
287 if( !i_max_pes_size ||
288 ( p_fmt->i_cat != VIDEO_ES && i_max_pes_size > PES_PAYLOAD_SIZE_MAX ) )
290 i_max_pes_size = PES_PAYLOAD_SIZE_MAX;
293 /* HACK for private stream 1 in ps */
294 if( ( i_stream_id >> 8 ) == PES_PRIVATE_STREAM_1 )
296 i_private_id = i_stream_id & 0xff;
297 i_stream_id = PES_PRIVATE_STREAM_1;
300 if( p_fmt->i_codec == VLC_FOURCC( 'm', 'p','4', 'v' ) &&
301 p_es->i_flags & BLOCK_FLAG_TYPE_I )
303 /* For MPEG4 video, add VOL before I-frames */
304 p_es = block_Realloc( p_es, p_fmt->i_extra, p_es->i_buffer );
306 memcpy( p_es->p_buffer, p_fmt->p_extra, p_fmt->i_extra );
309 i_pts = p_es->i_pts <= 0 ? 0 : p_es->i_pts * 9 / 100; // 90000 units clock
310 i_dts = p_es->i_dts <= 0 ? 0 : p_es->i_dts * 9 / 100; // 90000 units clock
312 i_size = p_es->i_buffer;
313 p_data = p_es->p_buffer;
315 *pp_pes = p_pes = NULL;
318 memset( header, 0, 50 );
323 i_pes_payload = __MIN( i_size, i_max_pes_size );
324 i_pes_header = PESHeader( header, i_pts, i_dts, i_pes_payload,
325 p_fmt, i_stream_id, i_private_id, b_mpeg2,
326 b_data_alignment, i_header_size );
327 i_dts = 0; // only first PES has a dts/pts
332 p_es = block_Realloc( p_es, i_pes_header, p_es->i_buffer );
333 p_data = p_es->p_buffer+i_pes_header;
334 /* reuse p_es for first frame */
335 *pp_pes = p_pes = p_es;
336 /* don't touch i_dts, i_pts, i_length as are already set :) */
341 p_pes->p_next = block_New( p_sout, i_pes_header + i_pes_payload );
342 p_pes = p_pes->p_next;
347 if( i_pes_payload > 0 )
349 vlc_memcpy( p_pes->p_buffer + i_pes_header, p_data,
356 memcpy( p_pes->p_buffer, header, i_pes_header );
358 i_size -= i_pes_payload;
359 p_data += i_pes_payload;
360 p_pes->i_buffer = i_pes_header + i_pes_payload;
362 } while( i_size > 0 );
364 /* Now redate all pes */
365 i_dts = (*pp_pes)->i_dts;
366 i_length = (*pp_pes)->i_length / i_pes_count;
367 for( p_pes = *pp_pes; p_pes != NULL; p_pes = p_pes->p_next )
369 p_pes->i_dts = i_dts;
370 p_pes->i_length = i_length;