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 <vlc_common.h>
35 #include <vlc_block.h>
41 /** PESHeader, write a pes header
42 * \param i_es_size length of payload data. (Must be < PES_PAYLOAD_SIZE_MAX
43 * unless the conditions for unbounded PES packets are met)
44 * \param i_stream_id stream id as follows:
45 * - 0x00 - 0xff : normal stream_id as per Table 2-18
46 * - 0xfd00 - 0xfd7f : stream_id_extension = low 7 bits
47 * (stream_id = PES_EXTENDED_STREAM_ID)
48 * - 0xbd00 - 0xbdff : private_id = low 8 bits
49 * (stream_id = PES_PRIVATE_STREAM)
50 * \param i_header_size length of padding data to insert into PES packet
53 static inline int PESHeader( uint8_t *p_hdr, mtime_t i_pts, mtime_t i_dts,
54 int i_es_size, es_format_t *p_fmt,
55 int i_stream_id, bool b_mpeg2,
56 bool b_data_alignment, int i_header_size )
60 int i_private_id = -1;
61 int i_stream_id_extension = 0;
63 /* HACK for private stream 1 in ps */
64 if( ( i_stream_id >> 8 ) == PES_PRIVATE_STREAM_1 )
66 i_private_id = i_stream_id & 0xff;
67 i_stream_id = PES_PRIVATE_STREAM_1;
68 /* For PES_PRIVATE_STREAM_1 there is an extra header after the
70 /* i_private_id != -1 because TS use 0xbd without private_id */
72 if( ( i_private_id & 0xf0 ) == 0x80 )
75 else if( ( i_stream_id >> 8 ) == PES_EXTENDED_STREAM_ID )
77 /* Enable support for extended_stream_id as defined in
78 * ISO/IEC 13818-1:2000/Amd.2:2003 */
79 /* NB, i_extended_stream_id is limited to 7 bits */
80 i_stream_id_extension = i_stream_id & 0x7f;
81 i_stream_id = PES_EXTENDED_STREAM_ID;
84 bits_initwrite( &bits, 50, p_hdr );
87 bits_write( &bits, 24, 0x01 );
88 bits_write( &bits, 8, i_stream_id );
91 case PES_PROGRAM_STREAM_MAP:
93 case PES_PRIVATE_STREAM_2:
96 case PES_PROGRAM_STREAM_DIRECTORY:
97 case PES_DSMCC_STREAM:
98 case PES_ITU_T_H222_1_TYPE_E_STREAM:
99 /* add pes data size */
100 bits_write( &bits, 16, i_es_size );
102 return( bits.i_data );
105 /* arg, a little more difficult */
109 bool b_pes_extension_flag = false;
111 if( i_pts > 0 && i_dts > 0 &&
112 ( i_pts != i_dts || ( p_fmt->i_cat == VIDEO_ES &&
113 p_fmt->i_codec != VLC_CODEC_MPGV ) ) )
116 if ( !i_header_size ) i_header_size = 0xa;
121 if ( !i_header_size ) i_header_size = 0x5;
126 if ( !i_header_size ) i_header_size = 0x0;
129 if( i_stream_id == PES_EXTENDED_STREAM_ID )
131 b_pes_extension_flag = true;
132 i_header_size += 1 + 1;
135 if( b_pes_extension_flag )
140 /* Unbounded streams are only allowed in TS (not PS) and only
141 * for some ES, eg. MPEG* Video ES or Dirac ES. */
142 if( i_es_size > PES_PAYLOAD_SIZE_MAX )
143 bits_write( &bits, 16, 0 ); // size unbounded
145 bits_write( &bits, 16, i_es_size + i_extra + 3
146 + i_header_size ); // size
147 bits_write( &bits, 2, 0x02 ); // mpeg2 id
148 bits_write( &bits, 2, 0x00 ); // pes scrambling control
149 bits_write( &bits, 1, 0x00 ); // pes priority
150 bits_write( &bits, 1, b_data_alignment ); // data alignement indicator
151 bits_write( &bits, 1, 0x00 ); // copyright
152 bits_write( &bits, 1, 0x00 ); // original or copy
154 bits_write( &bits, 2, i_pts_dts ); // pts_dts flags
155 bits_write( &bits, 1, 0x00 ); // escr flags
156 bits_write( &bits, 1, 0x00 ); // es rate flag
157 bits_write( &bits, 1, 0x00 ); // dsm trick mode flag
158 bits_write( &bits, 1, 0x00 ); // additional copy info flag
159 bits_write( &bits, 1, 0x00 ); // pes crc flag
160 bits_write( &bits, 1, b_pes_extension_flag );
161 bits_write( &bits, 8, i_header_size );
164 if( i_pts_dts & 0x02 )
166 bits_write( &bits, 4, i_pts_dts ); // '0010' or '0011'
167 bits_write( &bits, 3, i_pts >> 30 );
168 bits_write( &bits, 1, 0x01 ); // marker
169 bits_write( &bits, 15, i_pts >> 15 );
170 bits_write( &bits, 1, 0x01 ); // marker
171 bits_write( &bits, 15, i_pts );
172 bits_write( &bits, 1, 0x01 ); // marker
173 i_header_size -= 0x5;
176 if( i_pts_dts & 0x01 )
178 bits_write( &bits, 4, 0x01 ); // '0001'
179 bits_write( &bits, 3, i_dts >> 30 );
180 bits_write( &bits, 1, 0x01 ); // marker
181 bits_write( &bits, 15, i_dts >> 15 );
182 bits_write( &bits, 1, 0x01 ); // marker
183 bits_write( &bits, 15, i_dts );
184 bits_write( &bits, 1, 0x01 ); // marker
185 i_header_size -= 0x5;
187 if( b_pes_extension_flag )
189 bits_write( &bits, 1, 0x00 ); // PES_private_data_flag
190 bits_write( &bits, 1, 0x00 ); // pack_header_field_flag
191 bits_write( &bits, 1, 0x00 ); // program_packet_sequence_counter_flag
192 bits_write( &bits, 1, 0x00 ); // P-STD_buffer_flag
193 bits_write( &bits, 3, 0x07 ); // reserved
194 bits_write( &bits, 1, 0x01 ); // PES_extension_flag_2
195 /* skipping unsupported parts: */
196 /* PES_private_data */
198 /* program_packet_sequence_counter */
199 /* P-STD_buffer_flag */
200 if( i_stream_id == PES_EXTENDED_STREAM_ID )
202 /* PES_extension_2 */
203 bits_write( &bits, 1, 0x01 ); // marker
204 bits_write( &bits, 7, 0x01 ); // PES_extension_field_length
205 bits_write( &bits, 1, 0x01 ); // stream_id_extension_flag
206 bits_write( &bits, 7, i_stream_id_extension );
207 i_header_size -= 0x2;
209 i_header_size -= 0x1;
211 while ( i_header_size )
213 bits_write( &bits, 8, 0xff );
221 if( i_pts > 0 && i_dts > 0 &&
222 ( i_pts != i_dts || p_fmt->i_cat == VIDEO_ES ) )
224 bits_write( &bits, 16, i_es_size + i_extra + 10 /* + stuffing */ );
229 bits_write( &bits, 16, i_es_size + i_extra + 5 /* + stuffing */ );
234 bits_write( &bits, 16, i_es_size + i_extra + 1 /* + stuffing */);
238 /* FIXME: Now should be stuffing */
240 /* No STD_buffer_scale and STD_buffer_size */
243 if( i_pts_dts & 0x02 )
245 bits_write( &bits, 4, i_pts_dts ); // '0010' or '0011'
246 bits_write( &bits, 3, i_pts >> 30 );
247 bits_write( &bits, 1, 0x01 ); // marker
248 bits_write( &bits, 15, i_pts >> 15 );
249 bits_write( &bits, 1, 0x01 ); // marker
250 bits_write( &bits, 15, i_pts );
251 bits_write( &bits, 1, 0x01 ); // marker
254 if( i_pts_dts & 0x01 )
256 bits_write( &bits, 4, 0x01 ); // '0001'
257 bits_write( &bits, 3, i_dts >> 30 );
258 bits_write( &bits, 1, 0x01 ); // marker
259 bits_write( &bits, 15, i_dts >> 15 );
260 bits_write( &bits, 1, 0x01 ); // marker
261 bits_write( &bits, 15, i_dts );
262 bits_write( &bits, 1, 0x01 ); // marker
266 bits_write( &bits, 8, 0x0F );
271 /* now should be stuffing */
272 /* and then pes data */
275 if( i_stream_id == PES_PRIVATE_STREAM_1 && i_private_id != -1 )
277 bits_write( &bits, 8, i_private_id );
278 if( ( i_private_id&0xf0 ) == 0x80 )
280 bits_write( &bits, 24, 0 ); // ac3
284 return( bits.i_data );
288 /** EStoPES, encapsulate an elementary stream block into PES packet(s)
289 * each with a maximal payload size of @i_max_pes_size@.
291 * In some circumstances, unbounded PES packets are allowed:
292 * - Transport streams only (NOT programme streams)
293 * - Only some types of elementary streams (eg MPEG2 video)
294 * It is the responsibility of the caller to enforce these constraints.
296 * EStoPES will only produce an unbounded PES packet if:
298 * - i_max_pes_size > PES_PAYLOAD_SIZE_MAX
299 * - length of p_es > PES_PAYLOAD_SIZE_MAX
300 * If the last condition is not met, a single PES packet is produced
301 * which is not unbounded in length.
303 * \param i_stream_id stream id as follows:
304 * - 0x00 - 0xff : normal stream_id as per Table 2-18
305 * - 0xfd00 - 0xfd7f : stream_id_extension = low 7 bits
306 * (stream_id = PES_EXTENDED_STREAM_ID)
307 * - 0xbd00 - 0xbdff : private_id = low 8 bits
308 * (stream_id = PES_PRIVATE_STREAM)
309 * \param i_header_size length of padding data to insert into PES packet
311 * \param i_max_pes_size maximum length of each pes packet payload.
312 * if zero, uses default maximum.
313 * To allow unbounded PES packets in transport stream
314 * VIDEO_ES, set to INT_MAX.
316 int EStoPES ( sout_instance_t *p_sout, block_t **pp_pes, block_t *p_es,
317 es_format_t *p_fmt, int i_stream_id,
318 int b_mpeg2, int b_data_alignment, int i_header_size,
323 mtime_t i_pts, i_dts, i_length;
328 uint8_t header[50]; // PES header + extra < 50 (more like 17)
334 assert( i_max_pes_size >= 0 );
335 assert( i_header_size >= 0 );
337 /* NB, Only video ES may have unbounded length */
338 if( !i_max_pes_size ||
339 ( p_fmt->i_cat != VIDEO_ES && i_max_pes_size > PES_PAYLOAD_SIZE_MAX ) )
341 i_max_pes_size = PES_PAYLOAD_SIZE_MAX;
344 if( p_fmt->i_codec == VLC_CODEC_MP4V &&
345 p_es->i_flags & BLOCK_FLAG_TYPE_I )
347 /* For MPEG4 video, add VOL before I-frames */
348 p_es = block_Realloc( p_es, p_fmt->i_extra, p_es->i_buffer );
350 memcpy( p_es->p_buffer, p_fmt->p_extra, p_fmt->i_extra );
353 i_pts = p_es->i_pts <= 0 ? 0 : p_es->i_pts * 9 / 100; // 90000 units clock
354 i_dts = p_es->i_dts <= 0 ? 0 : p_es->i_dts * 9 / 100; // 90000 units clock
356 i_size = p_es->i_buffer;
357 p_data = p_es->p_buffer;
359 *pp_pes = p_pes = NULL;
362 memset( header, 0, 50 );
367 i_pes_payload = __MIN( i_size, i_max_pes_size );
368 i_pes_header = PESHeader( header, i_pts, i_dts, i_pes_payload,
369 p_fmt, i_stream_id, b_mpeg2,
370 b_data_alignment, i_header_size );
371 i_dts = 0; // only first PES has a dts/pts
376 p_es = block_Realloc( p_es, i_pes_header, p_es->i_buffer );
377 p_data = p_es->p_buffer+i_pes_header;
378 /* reuse p_es for first frame */
379 *pp_pes = p_pes = p_es;
380 /* don't touch i_dts, i_pts, i_length as are already set :) */
385 p_pes->p_next = block_New( p_sout, i_pes_header + i_pes_payload );
386 p_pes = p_pes->p_next;
391 if( i_pes_payload > 0 )
393 vlc_memcpy( p_pes->p_buffer + i_pes_header, p_data,
400 memcpy( p_pes->p_buffer, header, i_pes_header );
402 i_size -= i_pes_payload;
403 p_data += i_pes_payload;
404 p_pes->i_buffer = i_pes_header + i_pes_payload;
406 } while( i_size > 0 );
408 /* Now redate all pes */
409 i_dts = (*pp_pes)->i_dts;
410 i_length = (*pp_pes)->i_length / i_pes_count;
411 for( p_pes = *pp_pes; p_pes != NULL; p_pes = p_pes->p_next )
413 p_pes->i_dts = i_dts;
414 p_pes->i_length = i_length;