1 /*****************************************************************************
2 * mpeg4video.c: mpeg 4 video packetizer
3 *****************************************************************************
4 * Copyright (C) 2001-2006 the VideoLAN team
7 * Authors: Gildas Bazin <gbazin@videolan.org>
8 * Laurent Aimar <fenrir@via.ecp.fr>
9 * Eric Petit <titer@videolan.org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
34 #include <vlc_common.h>
35 #include <vlc_plugin.h>
37 #include <vlc_codec.h>
38 #include <vlc_block.h>
41 #include "vlc_block_helper.h"
42 #include "packetizer_helper.h"
44 /*****************************************************************************
46 *****************************************************************************/
47 static int Open ( vlc_object_t * );
48 static void Close( vlc_object_t * );
51 set_category( CAT_SOUT )
52 set_subcategory( SUBCAT_SOUT_PACKETIZER )
53 set_description( N_("MPEG4 video packetizer") )
54 set_capability( "packetizer", 50 )
55 set_callbacks( Open, Close )
58 /****************************************************************************
60 ****************************************************************************/
66 packetizer_t packetizer;
71 mtime_t i_interpolated_pts;
72 mtime_t i_interpolated_dts;
73 mtime_t i_last_ref_pts;
74 mtime_t i_last_time_ref;
77 mtime_t i_last_timeincr;
88 /* Current frame being built */
93 static block_t *Packetize( decoder_t *, block_t ** );
95 static void PacketizeReset( void *p_private, bool b_broken );
96 static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t * );
97 static int PacketizeValidate( void *p_private, block_t * );
99 static block_t *ParseMPEGBlock( decoder_t *, block_t * );
100 static int ParseVOL( decoder_t *, es_format_t *, uint8_t *, int );
101 static int ParseVOP( decoder_t *, block_t * );
102 static int vlc_log2( unsigned int );
104 #define VIDEO_OBJECT_MASK 0x01f
105 #define VIDEO_OBJECT_LAYER_MASK 0x00f
107 #define VIDEO_OBJECT_START_CODE 0x100
108 #define VIDEO_OBJECT_LAYER_START_CODE 0x120
109 #define VISUAL_OBJECT_SEQUENCE_START_CODE 0x1b0
110 #define VISUAL_OBJECT_SEQUENCE_END_CODE 0x1b1
111 #define USER_DATA_START_CODE 0x1b2
112 #define GROUP_OF_VOP_START_CODE 0x1b3
113 #define VIDEO_SESSION_ERROR_CODE 0x1b4
114 #define VISUAL_OBJECT_START_CODE 0x1b5
115 #define VOP_START_CODE 0x1b6
116 #define FACE_OBJECT_START_CODE 0x1ba
117 #define FACE_OBJECT_PLANE_START_CODE 0x1bb
118 #define MESH_OBJECT_START_CODE 0x1bc
119 #define MESH_OBJECT_PLANE_START_CODE 0x1bd
120 #define STILL_TEXTURE_OBJECT_START_CODE 0x1be
121 #define TEXTURE_SPATIAL_LAYER_START_CODE 0x1bf
122 #define TEXTURE_SNR_LAYER_START_CODE 0x1c0
124 static const uint8_t p_mp4v_startcode[3] = { 0x00, 0x00, 0x01 };
126 /*****************************************************************************
127 * Open: probe the packetizer and return score
128 *****************************************************************************/
129 static int Open( vlc_object_t *p_this )
131 decoder_t *p_dec = (decoder_t*)p_this;
132 decoder_sys_t *p_sys;
134 switch( p_dec->fmt_in.i_codec )
136 case VLC_FOURCC( 'm', '4', 's', '2'):
137 case VLC_FOURCC( 'M', '4', 'S', '2'):
138 case VLC_FOURCC( 'm', 'p', '4', 's'):
139 case VLC_FOURCC( 'M', 'P', '4', 'S'):
140 case VLC_FOURCC( 'm', 'p', '4', 'v'):
141 case VLC_FOURCC( 'M', 'P', '4', 'V'):
142 case VLC_FOURCC( 'D', 'I', 'V', 'X'):
143 case VLC_FOURCC( 'd', 'i', 'v', 'x'):
144 case VLC_FOURCC( 'X', 'V', 'I', 'D'):
145 case VLC_FOURCC( 'X', 'v', 'i', 'D'):
146 case VLC_FOURCC( 'x', 'v', 'i', 'd'):
147 case VLC_FOURCC( 'D', 'X', '5', '0'):
148 case VLC_FOURCC( 'd', 'x', '5', '0'):
149 case VLC_FOURCC( 0x04, 0, 0, 0):
150 case VLC_FOURCC( '3', 'I', 'V', '2'):
151 case VLC_FOURCC( 'm', '4', 'c', 'c'):
152 case VLC_FOURCC( 'M', '4', 'C', 'C'):
159 /* Allocate the memory needed to store the decoder's structure */
160 if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
162 memset( p_sys, 0, sizeof(decoder_sys_t) );
165 packetizer_Init( &p_sys->packetizer,
166 p_mp4v_startcode, sizeof(p_mp4v_startcode),
168 PacketizeReset, PacketizeParse, PacketizeValidate, p_dec );
170 p_sys->p_frame = NULL;
171 p_sys->pp_last = &p_sys->p_frame;
173 /* Setup properties */
174 es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
175 p_dec->fmt_out.i_codec = VLC_FOURCC( 'm', 'p', '4', 'v' );
177 if( p_dec->fmt_in.i_extra )
180 p_dec->fmt_out.i_extra = p_dec->fmt_in.i_extra;
181 p_dec->fmt_out.p_extra = malloc( p_dec->fmt_in.i_extra );
182 memcpy( p_dec->fmt_out.p_extra, p_dec->fmt_in.p_extra,
183 p_dec->fmt_in.i_extra );
185 msg_Dbg( p_dec, "opening with vol size: %d", p_dec->fmt_in.i_extra );
186 ParseVOL( p_dec, &p_dec->fmt_out,
187 p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
191 /* No vol, we'll have to look for one later on */
192 p_dec->fmt_out.i_extra = 0;
193 p_dec->fmt_out.p_extra = 0;
197 p_dec->pf_packetize = Packetize;
202 /*****************************************************************************
203 * Close: clean up the packetizer
204 *****************************************************************************/
205 static void Close( vlc_object_t *p_this )
207 decoder_t *p_dec = (decoder_t*)p_this;
208 decoder_sys_t *p_sys = p_dec->p_sys;
210 packetizer_Clean( &p_sys->packetizer );
212 block_ChainRelease( p_sys->p_frame );
216 /****************************************************************************
217 * Packetize: the whole thing
218 ****************************************************************************/
219 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
221 decoder_sys_t *p_sys = p_dec->p_sys;
223 return packetizer_Packetize( &p_sys->packetizer, pp_block );
226 /*****************************************************************************
228 *****************************************************************************/
229 static void PacketizeReset( void *p_private, bool b_broken )
231 decoder_t *p_dec = p_private;
232 decoder_sys_t *p_sys = p_dec->p_sys;
237 block_ChainRelease( p_sys->p_frame );
238 p_sys->p_frame = NULL;
239 p_sys->pp_last = &p_sys->p_frame;
242 p_sys->i_interpolated_pts =
243 p_sys->i_interpolated_dts =
244 p_sys->i_last_ref_pts =
245 p_sys->i_last_time_ref =
248 p_sys->i_last_timeincr = 0;
251 static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t *p_block )
253 decoder_t *p_dec = p_private;
254 const mtime_t i_dts = p_block->i_dts;
255 const mtime_t i_pts = p_block->i_pts;
257 block_t *p_au = ParseMPEGBlock( p_dec, p_block );
259 *pb_ts_used = p_au && p_au->i_dts == i_dts && p_au->i_pts == i_pts;
265 static int PacketizeValidate( void *p_private, block_t *p_au )
267 decoder_t *p_dec = p_private;
268 decoder_sys_t *p_sys = p_dec->p_sys;
270 /* We've just started the stream, wait for the first PTS.
271 * We discard here so we can still get the sequence header. */
272 if( p_sys->i_interpolated_pts <= 0 &&
273 p_sys->i_interpolated_dts <= 0 )
275 msg_Dbg( p_dec, "need a starting pts/dts" );
279 /* When starting the stream we can have the first frame with
280 * a null DTS (i_interpolated_pts is initialized to 0) */
282 p_au->i_dts = p_au->i_pts;
286 /*****************************************************************************
287 * ParseMPEGBlock: Re-assemble fragments into a block containing a picture
288 *****************************************************************************/
289 static block_t *ParseMPEGBlock( decoder_t *p_dec, block_t *p_frag )
291 decoder_sys_t *p_sys = p_dec->p_sys;
292 block_t *p_pic = NULL;
294 if( p_frag->p_buffer[3] == 0xB0 || p_frag->p_buffer[3] == 0xB1 || p_frag->p_buffer[3] == 0xB2 )
295 { /* VOS and USERDATA */
297 /* Remove VOS start/end code from the original stream */
298 block_Release( p_frag );
300 /* Append the block for now since ts/ps muxers rely on VOL
301 * being present in the stream */
302 block_ChainLastAppend( &p_sys->pp_last, p_frag );
306 if( p_frag->p_buffer[3] >= 0x20 && p_frag->p_buffer[3] <= 0x2f )
308 /* Copy the complete VOL */
309 if( (size_t)p_dec->fmt_out.i_extra != p_frag->i_buffer )
311 p_dec->fmt_out.p_extra =
312 realloc( p_dec->fmt_out.p_extra, p_frag->i_buffer );
313 p_dec->fmt_out.i_extra = p_frag->i_buffer;
315 memcpy( p_dec->fmt_out.p_extra, p_frag->p_buffer, p_frag->i_buffer );
316 ParseVOL( p_dec, &p_dec->fmt_out,
317 p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
320 /* Remove from the original stream */
321 block_Release( p_frag );
323 /* Append the block for now since ts/ps muxers rely on VOL
324 * being present in the stream */
325 block_ChainLastAppend( &p_sys->pp_last, p_frag );
331 if( !p_dec->fmt_out.i_extra )
333 msg_Warn( p_dec, "waiting for VOL" );
334 block_Release( p_frag );
338 /* Append the block */
339 block_ChainLastAppend( &p_sys->pp_last, p_frag );
342 if( p_frag->p_buffer[3] == 0xb6 &&
343 ParseVOP( p_dec, p_frag ) == VLC_SUCCESS )
345 /* We are dealing with a VOP */
346 p_pic = block_ChainGather( p_sys->p_frame );
347 p_pic->i_flags = p_sys->i_flags;
348 p_pic->i_pts = p_sys->i_interpolated_pts;
349 p_pic->i_dts = p_sys->i_interpolated_dts;
352 p_sys->p_frame = NULL;
353 p_sys->pp_last = &p_sys->p_frame;
361 * - support aspect ratio
363 static int ParseVOL( decoder_t *p_dec, es_format_t *fmt,
364 uint8_t *p_vol, int i_vol )
366 decoder_sys_t *p_sys = p_dec->p_sys;
367 int i_vo_type, i_vo_ver_id, i_ar, i_shape;
372 if( p_vol[0] == 0x00 && p_vol[1] == 0x00 && p_vol[2] == 0x01 &&
373 p_vol[3] >= 0x20 && p_vol[3] <= 0x2f ) break;
376 if( i_vol <= 4 ) return VLC_EGENERIC;
379 bs_init( &s, &p_vol[4], i_vol - 4 );
381 bs_skip( &s, 1 ); /* random access */
382 i_vo_type = bs_read( &s, 8 );
385 i_vo_ver_id = bs_read( &s, 4 );
392 i_ar = bs_read( &s, 4 );
395 int i_ar_width, i_ar_height;
397 i_ar_width = bs_read( &s, 8 );
398 i_ar_height= bs_read( &s, 8 );
405 /* vol control parameter */
406 i_chroma_format = bs_read( &s, 2 );
407 i_low_delay = bs_read1( &s );
420 /* shape 0->RECT, 1->BIN, 2->BIN_ONLY, 3->GRAY */
421 i_shape = bs_read( &s, 2 );
422 if( i_shape == 3 && i_vo_ver_id != 1 )
427 if( !bs_read1( &s ) ) return VLC_EGENERIC; /* Marker */
429 p_sys->i_fps_num = bs_read( &s, 16 ); /* Time increment resolution*/
430 if( !p_sys->i_fps_num ) p_sys->i_fps_num = 1;
432 if( !bs_read1( &s ) ) return VLC_EGENERIC; /* Marker */
436 int i_time_increment_bits = vlc_log2( p_sys->i_fps_num - 1 ) + 1;
438 if( i_time_increment_bits < 1 ) i_time_increment_bits = 1;
440 p_sys->i_fps_den = bs_read( &s, i_time_increment_bits );
445 fmt->video.i_width = bs_read( &s, 13 );
447 fmt->video.i_height= bs_read( &s, 13 );
454 static int ParseVOP( decoder_t *p_dec, block_t *p_vop )
456 decoder_sys_t *p_sys = p_dec->p_sys;
457 int64_t i_time_increment, i_time_ref;
458 int i_modulo_time_base = 0, i_time_increment_bits;
461 bs_init( &s, &p_vop->p_buffer[4], p_vop->i_buffer - 4 );
463 switch( bs_read( &s, 2 ) )
466 p_sys->i_flags = BLOCK_FLAG_TYPE_I;
469 p_sys->i_flags = BLOCK_FLAG_TYPE_P;
472 p_sys->i_flags = BLOCK_FLAG_TYPE_B;
473 p_sys->b_frame = true;
476 p_sys->i_flags = BLOCK_FLAG_TYPE_PB;
480 while( bs_read( &s, 1 ) ) i_modulo_time_base++;
481 if( !bs_read1( &s ) ) return VLC_EGENERIC; /* Marker */
483 /* VOP time increment */
484 i_time_increment_bits = vlc_log2(p_dec->p_sys->i_fps_num - 1) + 1;
485 if( i_time_increment_bits < 1 ) i_time_increment_bits = 1;
486 i_time_increment = bs_read( &s, i_time_increment_bits );
488 /* Interpolate PTS/DTS */
489 if( !(p_sys->i_flags & BLOCK_FLAG_TYPE_B) )
491 p_sys->i_last_time_ref = p_sys->i_time_ref;
493 (i_modulo_time_base * p_dec->p_sys->i_fps_num);
494 i_time_ref = p_sys->i_time_ref;
498 i_time_ref = p_sys->i_last_time_ref +
499 (i_modulo_time_base * p_dec->p_sys->i_fps_num);
503 msg_Err( p_dec, "interp pts/dts (%lli,%lli), pts/dts (%lli,%lli)",
504 p_sys->i_interpolated_pts, p_sys->i_interpolated_dts,
505 p_vop->i_pts, p_vop->i_dts );
508 if( p_dec->p_sys->i_fps_num < 5 && /* Work-around buggy streams */
509 p_dec->fmt_in.video.i_frame_rate > 0 &&
510 p_dec->fmt_in.video.i_frame_rate_base > 0 )
512 p_sys->i_interpolated_pts += INT64_C(1000000) *
513 p_dec->fmt_in.video.i_frame_rate_base /
514 p_dec->fmt_in.video.i_frame_rate;
516 else if( p_dec->p_sys->i_fps_num )
517 p_sys->i_interpolated_pts +=
518 ( INT64_C(1000000) * (i_time_ref + i_time_increment -
519 p_sys->i_last_time - p_sys->i_last_timeincr) /
520 p_dec->p_sys->i_fps_num );
522 p_sys->i_last_time = i_time_ref;
523 p_sys->i_last_timeincr = i_time_increment;
525 /* Correct interpolated dts when we receive a new pts/dts */
526 if( p_vop->i_pts > 0 )
527 p_sys->i_interpolated_pts = p_vop->i_pts;
528 if( p_vop->i_dts > 0 )
529 p_sys->i_interpolated_dts = p_vop->i_dts;
531 if( (p_sys->i_flags & BLOCK_FLAG_TYPE_B) || !p_sys->b_frame )
533 /* Trivial case (DTS == PTS) */
535 p_sys->i_interpolated_dts = p_sys->i_interpolated_pts;
537 if( p_vop->i_pts > 0 )
538 p_sys->i_interpolated_dts = p_vop->i_pts;
539 if( p_vop->i_dts > 0 )
540 p_sys->i_interpolated_dts = p_vop->i_dts;
542 p_sys->i_interpolated_pts = p_sys->i_interpolated_dts;
546 if( p_sys->i_last_ref_pts > 0 )
547 p_sys->i_interpolated_dts = p_sys->i_last_ref_pts;
549 p_sys->i_last_ref_pts = p_sys->i_interpolated_pts;
555 /* look at ffmpeg av_log2 ;) */
556 static int vlc_log2( unsigned int v )
559 static const int vlc_log2_table[16] =
561 0,0,1,1,2,2,2,2, 3,3,3,3,3,3,3,3
579 n += vlc_log2_table[v];