1 /*****************************************************************************
2 * mpeg4video.c: mpeg 4 video packetizer
3 *****************************************************************************
4 * Copyright (C) 2001, 2002 VideoLAN
5 * $Id: mpeg4video.c,v 1.16 2003/11/18 20:15:38 fenrir Exp $
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_description( _("MPEG4 Video packetizer") );
45 set_capability( "packetizer", 50 );
46 set_callbacks( Open, Close );
50 /****************************************************************************
52 ****************************************************************************/
53 static block_t *Packetize( decoder_t *, block_t ** );
70 static int m4v_FindStartCode( uint8_t **pp_start, uint8_t *p_end );
71 static int m4v_VOLParse( es_format_t *fmt, uint8_t *p_vol, int i_vol );
73 #define VIDEO_OBJECT_MASK 0x01f
74 #define VIDEO_OBJECT_LAYER_MASK 0x00f
76 #define VIDEO_OBJECT_START_CODE 0x100
77 #define VIDEO_OBJECT_LAYER_START_CODE 0x120
78 #define VISUAL_OBJECT_SEQUENCE_START_CODE 0x1b0
79 #define VISUAL_OBJECT_SEQUENCE_END_CODE 0x1b1
80 #define USER_DATA_START_CODE 0x1b2
81 #define GROUP_OF_VOP_START_CODE 0x1b3
82 #define VIDEO_SESSION_ERROR_CODE 0x1b4
83 #define VISUAL_OBJECT_START_CODE 0x1b5
84 #define VOP_START_CODE 0x1b6
85 #define FACE_OBJECT_START_CODE 0x1ba
86 #define FACE_OBJECT_PLANE_START_CODE 0x1bb
87 #define MESH_OBJECT_START_CODE 0x1bc
88 #define MESH_OBJECT_PLANE_START_CODE 0x1bd
89 #define STILL_TEXTURE_OBJECT_START_CODE 0x1be
90 #define TEXTURE_SPATIAL_LAYER_START_CODE 0x1bf
91 #define TEXTURE_SNR_LAYER_START_CODE 0x1c0
93 /*****************************************************************************
94 * Open: probe the packetizer and return score
95 *****************************************************************************/
96 static int Open( vlc_object_t *p_this )
98 decoder_t *p_dec = (decoder_t*)p_this;
101 switch( p_dec->fmt_in.i_codec )
103 case VLC_FOURCC( 'm', '4', 's', '2'):
104 case VLC_FOURCC( 'M', '4', 'S', '2'):
105 case VLC_FOURCC( 'm', 'p', '4', 's'):
106 case VLC_FOURCC( 'M', 'P', '4', 'S'):
107 case VLC_FOURCC( 'm', 'p', '4', 'v'):
108 case VLC_FOURCC( 'D', 'I', 'V', 'X'):
109 case VLC_FOURCC( 'd', 'i', 'v', 'x'):
110 case VLC_FOURCC( 'X', 'V', 'I', 'D'):
111 case VLC_FOURCC( 'X', 'v', 'i', 'D'):
112 case VLC_FOURCC( 'x', 'v', 'i', 'd'):
113 case VLC_FOURCC( 'D', 'X', '5', '0'):
114 case VLC_FOURCC( 0x04, 0, 0, 0):
115 case VLC_FOURCC( '3', 'I', 'V', '2'):
122 /* Allocate the memory needed to store the decoder's structure */
123 if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
125 msg_Err( p_dec, "out of memory" );
129 p_sys->b_vop = VLC_FALSE;
131 p_sys->i_buffer_size = 10000;
132 p_sys->p_buffer = malloc( p_sys->i_buffer_size );
134 /* Setup properties */
135 p_dec->fmt_out = p_dec->fmt_in;
136 p_dec->fmt_out.i_codec = VLC_FOURCC( 'm', 'p', '4', 'v' );
138 if( p_dec->fmt_in.i_extra )
141 p_dec->fmt_out.i_extra = p_dec->fmt_in.i_extra;
142 p_dec->fmt_out.p_extra = malloc( p_dec->fmt_in.i_extra );
143 memcpy( p_dec->fmt_out.p_extra, p_dec->fmt_in.p_extra,
144 p_dec->fmt_in.i_extra );
146 msg_Dbg( p_dec, "opening with vol size:%d", p_dec->fmt_in.i_extra );
147 m4v_VOLParse( &p_dec->fmt_out,
148 p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
152 /* No vol, we'll have to look for one later on */
153 p_dec->fmt_out.i_extra = 0;
154 p_dec->fmt_out.p_extra = 0;
158 p_dec->pf_packetize = Packetize;
163 /*****************************************************************************
164 * Close: clean up the packetizer
165 *****************************************************************************/
166 static void Close( vlc_object_t *p_this )
168 decoder_t *p_dec = (decoder_t*)p_this;
170 free( p_dec->p_sys );
173 /****************************************************************************
174 * Packetize: the whole thing
175 ****************************************************************************/
176 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
178 decoder_sys_t *p_sys = p_dec->p_sys;
180 block_t *p_chain_out = NULL;
182 uint8_t *p_vol = NULL;
185 if( !pp_block || !*pp_block ) return NULL;
190 if( p_sys->i_buffer + p_block->i_buffer > p_sys->i_buffer_size )
192 p_sys->i_buffer_size += p_block->i_buffer + 1024;
193 p_sys->p_buffer = realloc( p_sys->p_buffer, p_sys->i_buffer_size );
195 memcpy( &p_sys->p_buffer[p_sys->i_buffer], p_block->p_buffer,
197 p_sys->i_buffer += p_block->i_buffer;
199 if( p_sys->i_buffer > 10*1000000 )
201 msg_Err( p_dec, "mmh reseting context" );
206 p_start = &p_sys->p_buffer[p_sys->i_buffer - p_block->i_buffer - 4];
207 if( p_start < p_sys->p_buffer )
209 p_start = p_sys->p_buffer;
213 if( m4v_FindStartCode( &p_start, &p_sys->p_buffer[p_sys->i_buffer] ) )
215 block_Release( p_block );
219 /* fprintf( stderr, "start code=0x1%2.2x\n", p_start[3] ); */
223 /* Copy the complete VOL */
224 p_dec->fmt_out.i_extra = p_start - p_vol;
225 p_dec->fmt_out.p_extra = malloc( p_dec->fmt_out.i_extra );
226 memcpy( p_dec->fmt_out.p_extra, p_vol, p_dec->fmt_out.i_extra );
227 m4v_VOLParse( &p_dec->fmt_out,
228 p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
234 /* Output the complete VOP we have */
235 int i_out = p_start - p_sys->p_buffer;
236 block_t *p_out = block_New( p_dec, i_out );
239 memcpy( p_out->p_buffer, p_sys->p_buffer, i_out );
240 if( i_out < p_sys->i_buffer )
242 memmove( p_sys->p_buffer, &p_sys->p_buffer[i_out],
243 p_sys->i_buffer - i_out );
245 p_sys->i_buffer -= i_out;
248 /* FIXME do proper dts/pts */
249 p_out->i_pts = p_sys->i_pts;
250 p_out->i_dts = p_sys->i_dts;
251 /* FIXME doesn't work when there is multiple VOP in one block */
252 if( p_block->i_dts > p_sys->i_dts )
254 p_out->i_length = p_block->i_dts - p_sys->i_dts;
257 if( p_dec->fmt_out.i_extra > 0 )
259 block_ChainAppend( &p_chain_out, p_out );
263 msg_Warn( p_dec, "waiting for VOL" );
264 block_Release( p_out );
268 fprintf( stderr, "pts=%lld dts=%lld length=%lldms\n",
269 p_out->i_pts, p_out->i_dts,
270 p_out->i_length / 1000 );
272 p_sys->b_vop = VLC_FALSE;
275 if( p_start[3] >= 0x20 && p_start[3] <= 0x2f )
277 /* Start of the VOL */
280 else if( p_start[3] == 0xb6 )
282 p_sys->b_vop = VLC_TRUE;
283 p_sys->i_pts = p_block->i_pts;
284 p_sys->i_dts = p_block->i_dts;
286 p_start += 4; /* Next */
290 /****************************************************************************
292 ****************************************************************************/
293 static int m4v_FindStartCode( uint8_t **pp_start, uint8_t *p_end )
295 uint8_t *p = *pp_start;
297 for( p = *pp_start; p < p_end - 4; p++ )
299 if( p[0] == 0 && p[1] == 0 && p[2] == 1 )
311 /* look at ffmpeg av_log2 ;) */
312 static int vlc_log2( unsigned int v )
315 static const int vlc_log2_table[16] =
317 0,0,1,1,2,2,2,2, 3,3,3,3,3,3,3,3
335 n += vlc_log2_table[v];
342 * - support aspect ratio
344 static int m4v_VOLParse( es_format_t *fmt, uint8_t *p_vol, int i_vol )
351 int i_time_increment_resolution;
355 if( p_vol[0] == 0x00 && p_vol[1] == 0x00 &&
357 p_vol[3] >= 0x20 && p_vol[3] <= 0x2f )
370 bs_init( &s, &p_vol[4], i_vol - 4 );
372 bs_skip( &s, 1 ); /* random access */
373 i_vo_type = bs_read( &s, 8 );
376 i_vo_ver_id = bs_read( &s, 4 );
383 i_ar = bs_read( &s, 4 );
386 int i_ar_width = bs_read( &s, 8 );
387 int i_ar_height= bs_read( &s, 8 );
391 /* vol control parameter */
392 int i_chroma_format = bs_read( &s, 2 );
393 int i_low_delay = bs_read1( &s );
406 /* shape 0->RECT, 1->BIN, 2->BIN_ONLY, 3->GRAY */
407 i_shape = bs_read( &s, 2 );
408 if( i_shape == 3 && i_vo_ver_id != 1 )
413 if( !bs_read1( &s ) )
418 i_time_increment_resolution = bs_read( &s, 16 );
419 if( !bs_read1( &s ) )
427 int i_time_increment_bits = vlc_log2( i_time_increment_resolution - 1 ) + 1;
428 if( i_time_increment_bits < 1 )
430 i_time_increment_bits = 1;
432 bs_skip( &s, i_time_increment_bits );
437 fmt->video.i_width = bs_read( &s, 13 );
439 fmt->video.i_height= bs_read( &s, 13 );