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 if( p_dec->fmt_in.i_codec != VLC_CODEC_MP4V )
137 /* Allocate the memory needed to store the decoder's structure */
138 if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
140 memset( p_sys, 0, sizeof(decoder_sys_t) );
143 packetizer_Init( &p_sys->packetizer,
144 p_mp4v_startcode, sizeof(p_mp4v_startcode),
146 PacketizeReset, PacketizeParse, PacketizeValidate, p_dec );
148 p_sys->p_frame = NULL;
149 p_sys->pp_last = &p_sys->p_frame;
151 /* Setup properties */
152 es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
153 p_dec->fmt_out.i_codec = VLC_CODEC_MP4V;
155 if( p_dec->fmt_in.i_extra )
158 p_dec->fmt_out.i_extra = p_dec->fmt_in.i_extra;
159 p_dec->fmt_out.p_extra = malloc( p_dec->fmt_in.i_extra );
160 memcpy( p_dec->fmt_out.p_extra, p_dec->fmt_in.p_extra,
161 p_dec->fmt_in.i_extra );
163 msg_Dbg( p_dec, "opening with vol size: %d", p_dec->fmt_in.i_extra );
164 ParseVOL( p_dec, &p_dec->fmt_out,
165 p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
169 /* No vol, we'll have to look for one later on */
170 p_dec->fmt_out.i_extra = 0;
171 p_dec->fmt_out.p_extra = 0;
175 p_dec->pf_packetize = Packetize;
180 /*****************************************************************************
181 * Close: clean up the packetizer
182 *****************************************************************************/
183 static void Close( vlc_object_t *p_this )
185 decoder_t *p_dec = (decoder_t*)p_this;
186 decoder_sys_t *p_sys = p_dec->p_sys;
188 packetizer_Clean( &p_sys->packetizer );
190 block_ChainRelease( p_sys->p_frame );
194 /****************************************************************************
195 * Packetize: the whole thing
196 ****************************************************************************/
197 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
199 decoder_sys_t *p_sys = p_dec->p_sys;
201 return packetizer_Packetize( &p_sys->packetizer, pp_block );
204 /*****************************************************************************
206 *****************************************************************************/
207 static void PacketizeReset( void *p_private, bool b_broken )
209 decoder_t *p_dec = p_private;
210 decoder_sys_t *p_sys = p_dec->p_sys;
215 block_ChainRelease( p_sys->p_frame );
216 p_sys->p_frame = NULL;
217 p_sys->pp_last = &p_sys->p_frame;
220 p_sys->i_interpolated_pts =
221 p_sys->i_interpolated_dts =
222 p_sys->i_last_ref_pts =
223 p_sys->i_last_time_ref =
226 p_sys->i_last_timeincr = 0;
229 static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t *p_block )
231 decoder_t *p_dec = p_private;
232 const mtime_t i_dts = p_block->i_dts;
233 const mtime_t i_pts = p_block->i_pts;
235 block_t *p_au = ParseMPEGBlock( p_dec, p_block );
237 *pb_ts_used = p_au && p_au->i_dts == i_dts && p_au->i_pts == i_pts;
243 static int PacketizeValidate( void *p_private, block_t *p_au )
245 decoder_t *p_dec = p_private;
246 decoder_sys_t *p_sys = p_dec->p_sys;
248 /* We've just started the stream, wait for the first PTS.
249 * We discard here so we can still get the sequence header. */
250 if( p_sys->i_interpolated_pts <= 0 &&
251 p_sys->i_interpolated_dts <= 0 )
253 msg_Dbg( p_dec, "need a starting pts/dts" );
257 /* When starting the stream we can have the first frame with
258 * a null DTS (i_interpolated_pts is initialized to 0) */
260 p_au->i_dts = p_au->i_pts;
264 /*****************************************************************************
265 * ParseMPEGBlock: Re-assemble fragments into a block containing a picture
266 *****************************************************************************/
267 static block_t *ParseMPEGBlock( decoder_t *p_dec, block_t *p_frag )
269 decoder_sys_t *p_sys = p_dec->p_sys;
270 block_t *p_pic = NULL;
272 if( p_frag->p_buffer[3] == 0xB0 || p_frag->p_buffer[3] == 0xB1 || p_frag->p_buffer[3] == 0xB2 )
273 { /* VOS and USERDATA */
275 /* Remove VOS start/end code from the original stream */
276 block_Release( p_frag );
278 /* Append the block for now since ts/ps muxers rely on VOL
279 * being present in the stream */
280 block_ChainLastAppend( &p_sys->pp_last, p_frag );
284 if( p_frag->p_buffer[3] >= 0x20 && p_frag->p_buffer[3] <= 0x2f )
286 /* Copy the complete VOL */
287 if( (size_t)p_dec->fmt_out.i_extra != p_frag->i_buffer )
289 p_dec->fmt_out.p_extra =
290 realloc( p_dec->fmt_out.p_extra, p_frag->i_buffer );
291 p_dec->fmt_out.i_extra = p_frag->i_buffer;
293 memcpy( p_dec->fmt_out.p_extra, p_frag->p_buffer, p_frag->i_buffer );
294 ParseVOL( p_dec, &p_dec->fmt_out,
295 p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
298 /* Remove from the original stream */
299 block_Release( p_frag );
301 /* Append the block for now since ts/ps muxers rely on VOL
302 * being present in the stream */
303 block_ChainLastAppend( &p_sys->pp_last, p_frag );
309 if( !p_dec->fmt_out.i_extra )
311 msg_Warn( p_dec, "waiting for VOL" );
312 block_Release( p_frag );
316 /* Append the block */
317 block_ChainLastAppend( &p_sys->pp_last, p_frag );
320 if( p_frag->p_buffer[3] == 0xb6 &&
321 ParseVOP( p_dec, p_frag ) == VLC_SUCCESS )
323 /* We are dealing with a VOP */
324 p_pic = block_ChainGather( p_sys->p_frame );
325 p_pic->i_flags = p_sys->i_flags;
326 p_pic->i_pts = p_sys->i_interpolated_pts;
327 p_pic->i_dts = p_sys->i_interpolated_dts;
330 p_sys->p_frame = NULL;
331 p_sys->pp_last = &p_sys->p_frame;
339 * - support aspect ratio
341 static int ParseVOL( decoder_t *p_dec, es_format_t *fmt,
342 uint8_t *p_vol, int i_vol )
344 decoder_sys_t *p_sys = p_dec->p_sys;
345 int i_vo_type, i_vo_ver_id, i_ar, i_shape;
350 if( p_vol[0] == 0x00 && p_vol[1] == 0x00 && p_vol[2] == 0x01 &&
351 p_vol[3] >= 0x20 && p_vol[3] <= 0x2f ) break;
354 if( i_vol <= 4 ) return VLC_EGENERIC;
357 bs_init( &s, &p_vol[4], i_vol - 4 );
359 bs_skip( &s, 1 ); /* random access */
360 i_vo_type = bs_read( &s, 8 );
363 i_vo_ver_id = bs_read( &s, 4 );
370 i_ar = bs_read( &s, 4 );
373 int i_ar_width, i_ar_height;
375 i_ar_width = bs_read( &s, 8 );
376 i_ar_height= bs_read( &s, 8 );
383 /* vol control parameter */
384 i_chroma_format = bs_read( &s, 2 );
385 i_low_delay = bs_read1( &s );
398 /* shape 0->RECT, 1->BIN, 2->BIN_ONLY, 3->GRAY */
399 i_shape = bs_read( &s, 2 );
400 if( i_shape == 3 && i_vo_ver_id != 1 )
405 if( !bs_read1( &s ) ) return VLC_EGENERIC; /* Marker */
407 p_sys->i_fps_num = bs_read( &s, 16 ); /* Time increment resolution*/
408 if( !p_sys->i_fps_num ) p_sys->i_fps_num = 1;
410 if( !bs_read1( &s ) ) return VLC_EGENERIC; /* Marker */
414 int i_time_increment_bits = vlc_log2( p_sys->i_fps_num - 1 ) + 1;
416 if( i_time_increment_bits < 1 ) i_time_increment_bits = 1;
418 p_sys->i_fps_den = bs_read( &s, i_time_increment_bits );
423 fmt->video.i_width = bs_read( &s, 13 );
425 fmt->video.i_height= bs_read( &s, 13 );
432 static int ParseVOP( decoder_t *p_dec, block_t *p_vop )
434 decoder_sys_t *p_sys = p_dec->p_sys;
435 int64_t i_time_increment, i_time_ref;
436 int i_modulo_time_base = 0, i_time_increment_bits;
439 bs_init( &s, &p_vop->p_buffer[4], p_vop->i_buffer - 4 );
441 switch( bs_read( &s, 2 ) )
444 p_sys->i_flags = BLOCK_FLAG_TYPE_I;
447 p_sys->i_flags = BLOCK_FLAG_TYPE_P;
450 p_sys->i_flags = BLOCK_FLAG_TYPE_B;
451 p_sys->b_frame = true;
454 p_sys->i_flags = BLOCK_FLAG_TYPE_PB;
458 while( bs_read( &s, 1 ) ) i_modulo_time_base++;
459 if( !bs_read1( &s ) ) return VLC_EGENERIC; /* Marker */
461 /* VOP time increment */
462 i_time_increment_bits = vlc_log2(p_dec->p_sys->i_fps_num - 1) + 1;
463 if( i_time_increment_bits < 1 ) i_time_increment_bits = 1;
464 i_time_increment = bs_read( &s, i_time_increment_bits );
466 /* Interpolate PTS/DTS */
467 if( !(p_sys->i_flags & BLOCK_FLAG_TYPE_B) )
469 p_sys->i_last_time_ref = p_sys->i_time_ref;
471 (i_modulo_time_base * p_dec->p_sys->i_fps_num);
472 i_time_ref = p_sys->i_time_ref;
476 i_time_ref = p_sys->i_last_time_ref +
477 (i_modulo_time_base * p_dec->p_sys->i_fps_num);
481 msg_Err( p_dec, "interp pts/dts (%lli,%lli), pts/dts (%lli,%lli)",
482 p_sys->i_interpolated_pts, p_sys->i_interpolated_dts,
483 p_vop->i_pts, p_vop->i_dts );
486 if( p_dec->p_sys->i_fps_num < 5 && /* Work-around buggy streams */
487 p_dec->fmt_in.video.i_frame_rate > 0 &&
488 p_dec->fmt_in.video.i_frame_rate_base > 0 )
490 p_sys->i_interpolated_pts += INT64_C(1000000) *
491 p_dec->fmt_in.video.i_frame_rate_base /
492 p_dec->fmt_in.video.i_frame_rate;
494 else if( p_dec->p_sys->i_fps_num )
495 p_sys->i_interpolated_pts +=
496 ( INT64_C(1000000) * (i_time_ref + i_time_increment -
497 p_sys->i_last_time - p_sys->i_last_timeincr) /
498 p_dec->p_sys->i_fps_num );
500 p_sys->i_last_time = i_time_ref;
501 p_sys->i_last_timeincr = i_time_increment;
503 /* Correct interpolated dts when we receive a new pts/dts */
504 if( p_vop->i_pts > 0 )
505 p_sys->i_interpolated_pts = p_vop->i_pts;
506 if( p_vop->i_dts > 0 )
507 p_sys->i_interpolated_dts = p_vop->i_dts;
509 if( (p_sys->i_flags & BLOCK_FLAG_TYPE_B) || !p_sys->b_frame )
511 /* Trivial case (DTS == PTS) */
513 p_sys->i_interpolated_dts = p_sys->i_interpolated_pts;
515 if( p_vop->i_pts > 0 )
516 p_sys->i_interpolated_dts = p_vop->i_pts;
517 if( p_vop->i_dts > 0 )
518 p_sys->i_interpolated_dts = p_vop->i_dts;
520 p_sys->i_interpolated_pts = p_sys->i_interpolated_dts;
524 if( p_sys->i_last_ref_pts > 0 )
525 p_sys->i_interpolated_dts = p_sys->i_last_ref_pts;
527 p_sys->i_last_ref_pts = p_sys->i_interpolated_pts;
533 /* look at ffmpeg av_log2 ;) */
534 static int vlc_log2( unsigned int v )
537 static const int vlc_log2_table[16] =
539 0,0,1,1,2,2,2,2, 3,3,3,3,3,3,3,3
557 n += vlc_log2_table[v];