1 /*****************************************************************************
2 * mpeg4video.c: mpeg 4 video packetizer
3 *****************************************************************************
4 * Copyright (C) 2001, 2002 VideoLAN
7 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
8 * Eric Petit <titer@videolan.org>
9 * Gildas Bazin <gbazin@netcourrier.com>
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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
29 #include <stdlib.h> /* malloc(), free() */
32 #include <vlc/decoder.h>
37 /*****************************************************************************
39 *****************************************************************************/
40 static int Open ( vlc_object_t * );
41 static void Close( vlc_object_t * );
44 set_category( CAT_SOUT );
45 set_subcategory( SUBCAT_SOUT_PACKETIZER );
46 set_description( _("MPEG4 video packetizer") );
47 set_capability( "packetizer", 50 );
48 set_callbacks( Open, Close );
52 /****************************************************************************
54 ****************************************************************************/
55 static block_t *Packetize( decoder_t *, block_t ** );
75 static int m4v_FindStartCode( uint8_t **pp_start, uint8_t *p_end );
76 static int m4v_VOLParse( es_format_t *fmt, uint8_t *p_vol, int i_vol );
78 #define VIDEO_OBJECT_MASK 0x01f
79 #define VIDEO_OBJECT_LAYER_MASK 0x00f
81 #define VIDEO_OBJECT_START_CODE 0x100
82 #define VIDEO_OBJECT_LAYER_START_CODE 0x120
83 #define VISUAL_OBJECT_SEQUENCE_START_CODE 0x1b0
84 #define VISUAL_OBJECT_SEQUENCE_END_CODE 0x1b1
85 #define USER_DATA_START_CODE 0x1b2
86 #define GROUP_OF_VOP_START_CODE 0x1b3
87 #define VIDEO_SESSION_ERROR_CODE 0x1b4
88 #define VISUAL_OBJECT_START_CODE 0x1b5
89 #define VOP_START_CODE 0x1b6
90 #define FACE_OBJECT_START_CODE 0x1ba
91 #define FACE_OBJECT_PLANE_START_CODE 0x1bb
92 #define MESH_OBJECT_START_CODE 0x1bc
93 #define MESH_OBJECT_PLANE_START_CODE 0x1bd
94 #define STILL_TEXTURE_OBJECT_START_CODE 0x1be
95 #define TEXTURE_SPATIAL_LAYER_START_CODE 0x1bf
96 #define TEXTURE_SNR_LAYER_START_CODE 0x1c0
98 /*****************************************************************************
99 * Open: probe the packetizer and return score
100 *****************************************************************************/
101 static int Open( vlc_object_t *p_this )
103 decoder_t *p_dec = (decoder_t*)p_this;
104 decoder_sys_t *p_sys;
106 switch( p_dec->fmt_in.i_codec )
108 case VLC_FOURCC( 'm', '4', 's', '2'):
109 case VLC_FOURCC( 'M', '4', 'S', '2'):
110 case VLC_FOURCC( 'm', 'p', '4', 's'):
111 case VLC_FOURCC( 'M', 'P', '4', 'S'):
112 case VLC_FOURCC( 'm', 'p', '4', 'v'):
113 case VLC_FOURCC( 'D', 'I', 'V', 'X'):
114 case VLC_FOURCC( 'd', 'i', 'v', 'x'):
115 case VLC_FOURCC( 'X', 'V', 'I', 'D'):
116 case VLC_FOURCC( 'X', 'v', 'i', 'D'):
117 case VLC_FOURCC( 'x', 'v', 'i', 'd'):
118 case VLC_FOURCC( 'D', 'X', '5', '0'):
119 case VLC_FOURCC( 'd', 'x', '5', '0'):
120 case VLC_FOURCC( 0x04, 0, 0, 0):
121 case VLC_FOURCC( '3', 'I', 'V', '2'):
122 case VLC_FOURCC( 'm', '4', 'c', 'c'):
123 case VLC_FOURCC( 'M', '4', 'C', 'C'):
130 /* Allocate the memory needed to store the decoder's structure */
131 if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
133 msg_Err( p_dec, "out of memory" );
138 p_sys->b_vop = VLC_FALSE;
140 p_sys->i_buffer_size = 0;
143 p_sys->b_frame = VLC_FALSE;
145 /* Setup properties */
146 es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
147 p_dec->fmt_out.i_codec = VLC_FOURCC( 'm', 'p', '4', 'v' );
149 if( p_dec->fmt_in.i_extra )
152 p_dec->fmt_out.i_extra = p_dec->fmt_in.i_extra;
153 p_dec->fmt_out.p_extra = malloc( p_dec->fmt_in.i_extra );
154 memcpy( p_dec->fmt_out.p_extra, p_dec->fmt_in.p_extra,
155 p_dec->fmt_in.i_extra );
157 msg_Dbg( p_dec, "opening with vol size:%d", p_dec->fmt_in.i_extra );
158 m4v_VOLParse( &p_dec->fmt_out,
159 p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
163 /* No vol, we'll have to look for one later on */
164 p_dec->fmt_out.i_extra = 0;
165 p_dec->fmt_out.p_extra = 0;
169 p_dec->pf_packetize = Packetize;
174 /*****************************************************************************
175 * Close: clean up the packetizer
176 *****************************************************************************/
177 static void Close( vlc_object_t *p_this )
179 decoder_t *p_dec = (decoder_t*)p_this;
181 if( p_dec->p_sys->p_buffer ) free( p_dec->p_sys->p_buffer );
182 free( p_dec->p_sys );
185 /****************************************************************************
186 * Packetize: the whole thing
187 ****************************************************************************/
188 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
190 decoder_sys_t *p_sys = p_dec->p_sys;
192 block_t *p_chain_out = NULL;
194 uint8_t *p_vol = NULL;
197 if( !pp_block || !*pp_block ) return NULL;
202 if( p_sys->i_buffer + p_block->i_buffer > p_sys->i_buffer_size )
204 p_sys->i_buffer_size += p_block->i_buffer + 1024;
205 p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
207 memcpy( &p_sys->p_buffer[p_sys->i_buffer], p_block->p_buffer,
209 p_sys->i_buffer += p_block->i_buffer;
211 if( p_sys->i_buffer > 10*1000000 )
213 msg_Err( p_dec, "mmh reseting context" );
218 p_start = &p_sys->p_buffer[p_sys->i_buffer - p_block->i_buffer - 4];
219 if( p_start < p_sys->p_buffer )
221 p_start = p_sys->p_buffer;
225 if( m4v_FindStartCode( &p_start, &p_sys->p_buffer[p_sys->i_buffer] ) )
227 block_Release( p_block );
231 /* fprintf( stderr, "start code=0x1%2.2x\n", p_start[3] ); */
235 /* Copy the complete VOL */
236 p_dec->fmt_out.i_extra = p_start - p_vol;
237 p_dec->fmt_out.p_extra =
238 realloc( p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
239 memcpy( p_dec->fmt_out.p_extra, p_vol, p_dec->fmt_out.i_extra );
240 m4v_VOLParse( &p_dec->fmt_out,
241 p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
247 /* Output the complete VOP we have */
248 int i_out = p_start - p_sys->p_buffer;
249 block_t *p_out = block_New( p_dec, i_out );
252 memcpy( p_out->p_buffer, p_sys->p_buffer, i_out );
253 if( i_out < p_sys->i_buffer )
255 memmove( p_sys->p_buffer, &p_sys->p_buffer[i_out],
256 p_sys->i_buffer - i_out );
258 p_sys->i_buffer -= i_out;
261 p_out->i_flags = p_sys->i_flags;
263 /* FIXME do proper dts/pts */
264 p_out->i_pts = p_sys->i_pts;
265 p_out->i_dts = p_sys->i_dts;
266 /* FIXME doesn't work when there is multiple VOP in one block */
267 if( p_block->i_dts > p_sys->i_dts )
269 p_out->i_length = p_block->i_dts - p_sys->i_dts;
272 if( p_dec->fmt_out.i_extra > 0 )
274 block_ChainAppend( &p_chain_out, p_out );
278 msg_Warn( p_dec, "waiting for VOL" );
279 block_Release( p_out );
283 fprintf( stderr, "pts=%lld dts=%lld length=%lldms\n",
284 p_out->i_pts, p_out->i_dts,
285 p_out->i_length / 1000 );
287 p_sys->b_vop = VLC_FALSE;
290 if( p_start[3] >= 0x20 && p_start[3] <= 0x2f )
292 /* Start of the VOL */
295 else if( p_start[3] == 0xb6 )
297 p_sys->b_vop = VLC_TRUE;
298 switch( p_start[4] >> 6 )
301 p_sys->i_flags = BLOCK_FLAG_TYPE_I;
304 p_sys->i_flags = BLOCK_FLAG_TYPE_P;
307 p_sys->i_flags = BLOCK_FLAG_TYPE_B;
308 p_sys->b_frame = VLC_TRUE;
311 p_sys->i_flags = BLOCK_FLAG_TYPE_PB;
315 /* The pts information is not available in all the containers.
316 * FIXME: calculate the pts correctly */
317 if( p_block->i_pts > 0 )
319 p_sys->i_pts = p_block->i_pts;
321 else if( (p_sys->i_flags&BLOCK_FLAG_TYPE_B) || !p_sys->b_frame )
323 p_sys->i_pts = p_block->i_dts;
329 if( p_block->i_dts > 0 )
331 p_sys->i_dts = p_block->i_dts;
333 else if( p_sys->i_dts > 0 )
335 /* XXX KLUDGE immonde, else transcode won't work */
336 p_sys->i_dts += 1000;
339 p_start += 4; /* Next */
343 /****************************************************************************
345 ****************************************************************************/
346 static int m4v_FindStartCode( uint8_t **pp_start, uint8_t *p_end )
348 uint8_t *p = *pp_start;
350 /* We wait for 4+1 bytes */
351 for( p = *pp_start; p < p_end - 5; p++ )
353 if( p[0] == 0 && p[1] == 0 && p[2] == 1 )
365 /* look at ffmpeg av_log2 ;) */
366 static int vlc_log2( unsigned int v )
369 static const int vlc_log2_table[16] =
371 0,0,1,1,2,2,2,2, 3,3,3,3,3,3,3,3
389 n += vlc_log2_table[v];
396 * - support aspect ratio
398 static int m4v_VOLParse( es_format_t *fmt, uint8_t *p_vol, int i_vol )
405 int i_time_increment_resolution;
409 if( p_vol[0] == 0x00 && p_vol[1] == 0x00 &&
411 p_vol[3] >= 0x20 && p_vol[3] <= 0x2f )
424 bs_init( &s, &p_vol[4], i_vol - 4 );
426 bs_skip( &s, 1 ); /* random access */
427 i_vo_type = bs_read( &s, 8 );
430 i_vo_ver_id = bs_read( &s, 4 );
437 i_ar = bs_read( &s, 4 );
440 int i_ar_width, i_ar_height;
442 i_ar_width = bs_read( &s, 8 );
443 i_ar_height= bs_read( &s, 8 );
450 /* vol control parameter */
451 i_chroma_format = bs_read( &s, 2 );
452 i_low_delay = bs_read1( &s );
465 /* shape 0->RECT, 1->BIN, 2->BIN_ONLY, 3->GRAY */
466 i_shape = bs_read( &s, 2 );
467 if( i_shape == 3 && i_vo_ver_id != 1 )
472 if( !bs_read1( &s ) )
477 i_time_increment_resolution = bs_read( &s, 16 );
478 if( !bs_read1( &s ) )
486 int i_time_increment_bits = vlc_log2( i_time_increment_resolution - 1 ) + 1;
487 if( i_time_increment_bits < 1 )
489 i_time_increment_bits = 1;
491 bs_skip( &s, i_time_increment_bits );
496 fmt->video.i_width = bs_read( &s, 13 );
498 fmt->video.i_height= bs_read( &s, 13 );