1 /*****************************************************************************
2 * h264.c: h264/avc 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@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., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
24 *****************************************************************************/
26 /*****************************************************************************
28 *****************************************************************************/
29 #include <stdlib.h> /* malloc(), free() */
32 #include <vlc/decoder.h>
35 #include "vlc_block_helper.h"
38 /*****************************************************************************
40 *****************************************************************************/
41 static int Open ( vlc_object_t * );
42 static void Close( vlc_object_t * );
45 set_description( _("H264 video packetizer") );
46 set_capability( "packetizer", 50 );
47 set_callbacks( Open, Close );
51 /****************************************************************************
53 ****************************************************************************/
54 static block_t *Packetize( decoder_t *, block_t ** );
55 static block_t *PacketizeAVC1( decoder_t *, block_t ** );
59 block_bytestream_t bytestream;
75 int i_avcC_length_size;
77 /* Useful values of the Sequence Parameter Set */
78 int i_log2_max_frame_num;
81 /* Useful values of the Slice Header */
101 NAL_SLICE_IDR = 5, /* ref_idc != 0 */
102 NAL_SEI = 6, /* ref_idc == 0 */
105 /* ref_idc == 0 for 6,9,10,11,12 */
110 NAL_PRIORITY_DISPOSABLE = 0,
111 NAL_PRIORITY_LOW = 1,
112 NAL_PRIORITY_HIGH = 2,
113 NAL_PRIORITY_HIGHEST = 3,
116 static block_t *ParseNALBlock( decoder_t *, block_t * );
118 static block_t *nal_get_annexeb( decoder_t *, uint8_t *p, int );
120 /*****************************************************************************
121 * Open: probe the packetizer and return score
122 *****************************************************************************/
123 static int Open( vlc_object_t *p_this )
125 decoder_t *p_dec = (decoder_t*)p_this;
126 decoder_sys_t *p_sys;
128 if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'h', '2', '6', '4') &&
129 p_dec->fmt_in.i_codec != VLC_FOURCC( 'H', '2', '6', '4') &&
130 p_dec->fmt_in.i_codec != VLC_FOURCC( 'V', 'S', 'S', 'H') &&
131 p_dec->fmt_in.i_codec != VLC_FOURCC( 'v', 's', 's', 'h') &&
132 ( p_dec->fmt_in.i_codec != VLC_FOURCC( 'a', 'v', 'c', '1') ||
133 p_dec->fmt_in.i_extra < 7 ) )
138 /* Allocate the memory needed to store the decoder's structure */
139 if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
141 msg_Err( p_dec, "out of memory" );
144 p_sys->i_state = STATE_NOSYNC;
146 p_sys->startcode[0] = 0;
147 p_sys->startcode[1] = 0;
148 p_sys->startcode[2] = 0;
149 p_sys->startcode[3] = 1;
150 p_sys->bytestream = block_BytestreamInit( p_dec );
151 p_sys->b_slice = VLC_FALSE;
152 p_sys->p_frame = NULL;
156 p_sys->b_sps = VLC_FALSE;
158 p_sys->i_nal_type = -1;
159 p_sys->i_nal_ref_idc = -1;
160 p_sys->i_idr_pic_id = -1;
161 p_sys->i_frame_num = -1;
163 /* Setup properties */
164 es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
165 p_dec->fmt_out.i_codec = VLC_FOURCC( 'h', '2', '6', '4' );
166 /* FIXME: FFMPEG isn't happy at all if you leave this */
167 if( p_dec->fmt_out.i_extra ) free( p_dec->fmt_out.p_extra );
168 p_dec->fmt_out.i_extra = 0; p_dec->fmt_out.p_extra = 0;
170 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
172 uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
177 p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
182 for( i = 0; i < i_sps; i++ )
184 int i_length = GetWBE( p );
185 block_t *p_sps = nal_get_annexeb( p_dec, p + 2, i_length );
187 ParseNALBlock( p_dec, p_sps );
192 for( i = 0; i < i_pps; i++ )
194 int i_length = GetWBE( p );
195 block_t *p_pps = nal_get_annexeb( p_dec, p + 2, i_length );
197 ParseNALBlock( p_dec, p_pps );
200 msg_Dbg( p_dec, "avcC length size=%d sps=%d pps=%d",
201 p_sys->i_avcC_length_size, i_sps, i_pps );
204 p_dec->pf_packetize = PacketizeAVC1;
209 p_dec->pf_packetize = Packetize;
215 /*****************************************************************************
216 * Close: clean up the packetizer
217 *****************************************************************************/
218 static void Close( vlc_object_t *p_this )
220 decoder_t *p_dec = (decoder_t*)p_this;
221 decoder_sys_t *p_sys = p_dec->p_sys;
223 block_BytestreamRelease( &p_sys->bytestream );
227 /****************************************************************************
228 * Packetize: the whole thing
229 ****************************************************************************/
230 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
232 decoder_sys_t *p_sys = p_dec->p_sys;
235 if( !pp_block || !*pp_block ) return NULL;
237 block_BytestreamPush( &p_sys->bytestream, *pp_block );
241 switch( p_sys->i_state )
244 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
245 &p_sys->i_offset, p_sys->startcode+1, 3 ) == VLC_SUCCESS)
247 p_sys->i_state = STATE_NEXT_SYNC;
250 if( p_sys->i_offset )
252 block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
254 block_BytestreamFlush( &p_sys->bytestream );
257 if( p_sys->i_state != STATE_NEXT_SYNC )
263 p_sys->i_offset = 1; /* To find next startcode */
265 case STATE_NEXT_SYNC:
266 /* Find the next startcode */
267 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
268 &p_sys->i_offset, p_sys->startcode, 3 ) != VLC_SUCCESS)
270 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
271 &p_sys->i_offset, p_sys->startcode+1, 3 ) !=
279 /* Get the new fragment and set the pts/dts */
280 p_pic = block_New( p_dec, p_sys->i_offset );
281 p_pic->i_pts = p_sys->bytestream.p_block->i_pts;
282 p_pic->i_dts = p_sys->bytestream.p_block->i_dts;
284 block_GetBytes( &p_sys->bytestream, p_pic->p_buffer,
290 if( !( p_pic = ParseNALBlock( p_dec, p_pic ) ) )
292 p_sys->i_state = STATE_NOSYNC;
296 /* So p_block doesn't get re-added several times */
297 *pp_block = block_BytestreamPop( &p_sys->bytestream );
299 p_sys->i_state = STATE_NOSYNC;
306 /****************************************************************************
307 * PacketizeAVC1: the whole thing
308 ****************************************************************************/
309 static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
311 decoder_sys_t *p_sys = p_dec->p_sys;
313 block_t *p_ret = NULL;
316 if( !pp_block || !*pp_block ) return NULL;
321 for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
327 for( i = 0; i < p_sys->i_avcC_length_size; i++ )
329 i_size = (i_size << 8) | (*p++);
334 block_t *p_part = nal_get_annexeb( p_dec, p, i_size );
336 p_part->i_dts = p_block->i_dts;
337 p_part->i_pts = p_block->i_pts;
340 if( ( p_pic = ParseNALBlock( p_dec, p_part ) ) )
342 block_ChainAppend( &p_ret, p_pic );
351 static block_t *nal_get_annexeb( decoder_t *p_dec, uint8_t *p, int i_size )
355 p_nal = block_New( p_dec, 3 + i_size );
358 p_nal->p_buffer[0] = 0x00;
359 p_nal->p_buffer[1] = 0x00;
360 p_nal->p_buffer[2] = 0x01;
363 memcpy( &p_nal->p_buffer[3], p, i_size );
368 static void nal_get_decoded( uint8_t **pp_ret, int *pi_ret,
369 uint8_t *src, int i_src )
371 uint8_t *end = &src[i_src];
372 uint8_t *dst = malloc( i_src );
378 if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
390 *pi_ret = dst - *pp_ret;
393 static inline int bs_read_ue( bs_t *s )
397 while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
401 return( ( 1 << i) - 1 + bs_read( s, i ) );
404 static inline int bs_read_se( bs_t *s )
406 int val = bs_read_ue( s );
408 return val&0x01 ? (val+1)/2 : -(val/2);
412 static block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
414 decoder_sys_t *p_sys = p_dec->p_sys;
415 block_t *p_pic = NULL;
417 const int i_nal_ref_idc = (p_frag->p_buffer[3] >> 5)&0x03;
418 const int i_nal_type = p_frag->p_buffer[3]&0x1f;
420 if( p_sys->b_slice && !p_sys->b_sps )
422 block_ChainRelease( p_sys->p_frame );
423 msg_Warn( p_dec, "waiting for SPS" );
426 p_sys->p_frame = NULL;
427 p_sys->b_slice = VLC_FALSE;
431 i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
433 p_sys->b_slice = VLC_TRUE;
434 /* Fragment will be discarded later on */
436 else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
439 int i_dec, i_first_mb, i_slice_type, i_frame_num, i_pic_flags = 0;
440 vlc_bool_t b_pic = VLC_FALSE;
443 /* do not convert the whole frame */
444 nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[4],
445 __MIN( p_frag->i_buffer - 4, 60 ) );
446 bs_init( &s, dec, i_dec );
448 /* first_mb_in_slice */
449 i_first_mb = bs_read_ue( &s );
452 switch( (i_slice_type = bs_read_ue( &s )) )
455 i_pic_flags = BLOCK_FLAG_TYPE_P;
458 i_pic_flags = BLOCK_FLAG_TYPE_B;
461 i_pic_flags = BLOCK_FLAG_TYPE_I;
463 case 3: case 8: /* SP */
464 i_pic_flags = BLOCK_FLAG_TYPE_P;
467 i_pic_flags = BLOCK_FLAG_TYPE_I;
471 /* pic_parameter_set_id */
474 i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );
476 /* Detection of the first VCL NAL unit of a primary coded picture
478 if( i_frame_num != p_sys->i_frame_num ||
479 ( (i_nal_ref_idc != p_sys->i_nal_ref_idc) &&
480 (!i_nal_ref_idc || !p_sys->i_nal_ref_idc) ) )
484 p_sys->i_frame_num = i_frame_num;
485 p_sys->i_nal_ref_idc = i_nal_ref_idc;
487 if( !p_sys->b_frame_mbs_only )
490 if( bs_read( &s, 1 ) )
492 /* bottom_field_flag */
497 if( i_nal_type == NAL_SLICE_IDR )
500 int i_idr_pic_id = bs_read_ue( &s );
501 if( p_sys->i_nal_type != i_nal_type ) b_pic = VLC_TRUE;
502 if( p_sys->i_idr_pic_id != i_idr_pic_id ) b_pic = VLC_TRUE;
503 p_sys->i_idr_pic_id = i_idr_pic_id;
505 p_sys->i_nal_type = i_nal_type;
507 if( b_pic && p_sys->b_slice )
509 p_pic = block_ChainGather( p_sys->p_frame );
510 p_pic->i_dts = p_sys->i_dts;
511 p_pic->i_pts = p_sys->i_pts;
512 p_pic->i_length = 0; /* FIXME */
513 p_pic->i_flags = p_sys->i_flags;
516 p_sys->p_frame = NULL;
517 p_sys->b_slice = VLC_FALSE;
520 p_sys->b_slice = VLC_TRUE;
521 p_sys->i_flags = i_pic_flags;
522 p_sys->i_dts = p_frag->i_dts;
523 p_sys->i_pts = p_frag->i_pts;
527 else if( i_nal_type == NAL_SPS )
534 msg_Dbg( p_dec, "found NAL_SPS" );
536 p_sys->b_sps = VLC_TRUE;
538 nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[4],
539 p_frag->i_buffer - 4 );
541 bs_init( &s, dec, i_dec );
542 /* Skip profile(8), constraint_set012, reserver(5), level(8) */
543 bs_skip( &s, 8 + 1+1+1 + 5 + 8 );
546 /* Skip i_log2_max_frame_num */
547 p_sys->i_log2_max_frame_num = bs_read_ue( &s );
549 i_tmp = bs_read_ue( &s );
552 /* skip i_log2_max_poc_lsb */
555 else if( i_tmp == 1 )
558 /* skip b_delta_pic_order_always_zero */
560 /* skip i_offset_for_non_ref_pic */
562 /* skip i_offset_for_top_to_bottom_field */
564 /* read i_num_ref_frames_in_poc_cycle */
565 i_cycle = bs_read_ue( &s );
566 if( i_cycle > 256 ) i_cycle = 256;
569 /* skip i_offset_for_ref_frame */
573 /* i_num_ref_frames */
575 /* b_gaps_in_frame_num_value_allowed */
579 p_dec->fmt_out.video.i_width = 16 * ( bs_read_ue( &s ) + 1 );
580 p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );
582 /* b_frame_mbs_only */
583 p_sys->b_frame_mbs_only = bs_read( &s, 1 );
584 if( p_sys->b_frame_mbs_only == 0 )
588 /* b_direct8x8_inference */
592 i_tmp = bs_read( &s, 1 );
606 i_tmp = bs_read( &s, 1 );
609 /* read the aspect ratio part if any FIXME check it */
610 i_tmp = bs_read( &s, 1 );
613 static const struct { int w, h; } sar[14] =
615 { 0, 0 }, { 1, 1 }, { 12, 11 }, { 10, 11 },
616 { 16, 11 }, { 40, 33 }, { 24, 11 }, { 20, 11 },
617 { 32, 11 }, { 80, 33 }, { 18, 11 }, { 15, 11 },
618 { 64, 33 }, { 160,99 },
620 int i_sar = bs_read( &s, 8 );
630 w = bs_read( &s, 16 );
631 h = bs_read( &s, 16 );
633 p_dec->fmt_out.video.i_aspect =
634 VOUT_ASPECT_FACTOR * w / h * p_dec->fmt_out.video.i_width /
635 p_dec->fmt_out.video.i_height;
641 else if( i_nal_type == NAL_PPS )
644 bs_init( &s, &p_frag->p_buffer[4], p_frag->i_buffer - 4 );
647 msg_Dbg( p_dec, "found NAL_PPS" );
650 /* Append the block */
651 block_ChainAppend( &p_sys->p_frame, p_frag );