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_category( CAT_SOUT );
46 set_subcategory( SUBCAT_SOUT_PACKETIZER );
47 set_description( _("H264 video packetizer") );
48 set_capability( "packetizer", 50 );
49 set_callbacks( Open, Close );
53 /****************************************************************************
55 ****************************************************************************/
56 static block_t *Packetize( decoder_t *, block_t ** );
57 static block_t *PacketizeAVC1( decoder_t *, block_t ** );
61 block_bytestream_t bytestream;
77 int i_avcC_length_size;
79 /* Useful values of the Sequence Parameter Set */
80 int i_log2_max_frame_num;
83 /* Useful values of the Slice Header */
103 NAL_SLICE_IDR = 5, /* ref_idc != 0 */
104 NAL_SEI = 6, /* ref_idc == 0 */
107 /* ref_idc == 0 for 6,9,10,11,12 */
112 NAL_PRIORITY_DISPOSABLE = 0,
113 NAL_PRIORITY_LOW = 1,
114 NAL_PRIORITY_HIGH = 2,
115 NAL_PRIORITY_HIGHEST = 3,
118 static block_t *ParseNALBlock( decoder_t *, block_t * );
120 static block_t *nal_get_annexeb( decoder_t *, uint8_t *p, int );
122 /*****************************************************************************
123 * Open: probe the packetizer and return score
124 *****************************************************************************/
125 static int Open( vlc_object_t *p_this )
127 decoder_t *p_dec = (decoder_t*)p_this;
128 decoder_sys_t *p_sys;
130 if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'h', '2', '6', '4') &&
131 p_dec->fmt_in.i_codec != VLC_FOURCC( 'H', '2', '6', '4') &&
132 p_dec->fmt_in.i_codec != VLC_FOURCC( 'V', 'S', 'S', 'H') &&
133 p_dec->fmt_in.i_codec != VLC_FOURCC( 'v', 's', 's', 'h') &&
134 ( p_dec->fmt_in.i_codec != VLC_FOURCC( 'a', 'v', 'c', '1') ||
135 p_dec->fmt_in.i_extra < 7 ) )
140 /* Allocate the memory needed to store the decoder's structure */
141 if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
143 msg_Err( p_dec, "out of memory" );
146 p_sys->i_state = STATE_NOSYNC;
148 p_sys->startcode[0] = 0;
149 p_sys->startcode[1] = 0;
150 p_sys->startcode[2] = 0;
151 p_sys->startcode[3] = 1;
152 p_sys->bytestream = block_BytestreamInit( p_dec );
153 p_sys->b_slice = VLC_FALSE;
154 p_sys->p_frame = NULL;
158 p_sys->b_sps = VLC_FALSE;
160 p_sys->i_nal_type = -1;
161 p_sys->i_nal_ref_idc = -1;
162 p_sys->i_idr_pic_id = -1;
163 p_sys->i_frame_num = -1;
165 /* Setup properties */
166 es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
167 p_dec->fmt_out.i_codec = VLC_FOURCC( 'h', '2', '6', '4' );
168 /* FIXME: FFMPEG isn't happy at all if you leave this */
169 if( p_dec->fmt_out.i_extra ) free( p_dec->fmt_out.p_extra );
170 p_dec->fmt_out.i_extra = 0; p_dec->fmt_out.p_extra = 0;
172 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
174 uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
179 p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
184 for( i = 0; i < i_sps; i++ )
186 int i_length = GetWBE( p );
187 block_t *p_sps = nal_get_annexeb( p_dec, p + 2, i_length );
189 ParseNALBlock( p_dec, p_sps );
194 for( i = 0; i < i_pps; i++ )
196 int i_length = GetWBE( p );
197 block_t *p_pps = nal_get_annexeb( p_dec, p + 2, i_length );
199 ParseNALBlock( p_dec, p_pps );
202 msg_Dbg( p_dec, "avcC length size=%d sps=%d pps=%d",
203 p_sys->i_avcC_length_size, i_sps, i_pps );
206 p_dec->pf_packetize = PacketizeAVC1;
211 p_dec->pf_packetize = Packetize;
217 /*****************************************************************************
218 * Close: clean up the packetizer
219 *****************************************************************************/
220 static void Close( vlc_object_t *p_this )
222 decoder_t *p_dec = (decoder_t*)p_this;
223 decoder_sys_t *p_sys = p_dec->p_sys;
225 block_BytestreamRelease( &p_sys->bytestream );
229 /****************************************************************************
230 * Packetize: the whole thing
231 ****************************************************************************/
232 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
234 decoder_sys_t *p_sys = p_dec->p_sys;
237 if( !pp_block || !*pp_block ) return NULL;
239 block_BytestreamPush( &p_sys->bytestream, *pp_block );
243 switch( p_sys->i_state )
246 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
247 &p_sys->i_offset, p_sys->startcode+1, 3 ) == VLC_SUCCESS)
249 p_sys->i_state = STATE_NEXT_SYNC;
252 if( p_sys->i_offset )
254 block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
256 block_BytestreamFlush( &p_sys->bytestream );
259 if( p_sys->i_state != STATE_NEXT_SYNC )
265 p_sys->i_offset = 1; /* To find next startcode */
267 case STATE_NEXT_SYNC:
268 /* Find the next startcode */
269 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
270 &p_sys->i_offset, p_sys->startcode, 3 ) != VLC_SUCCESS)
272 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
273 &p_sys->i_offset, p_sys->startcode+1, 3 ) !=
281 /* Get the new fragment and set the pts/dts */
282 p_pic = block_New( p_dec, p_sys->i_offset );
283 p_pic->i_pts = p_sys->bytestream.p_block->i_pts;
284 p_pic->i_dts = p_sys->bytestream.p_block->i_dts;
286 block_GetBytes( &p_sys->bytestream, p_pic->p_buffer,
292 if( !( p_pic = ParseNALBlock( p_dec, p_pic ) ) )
294 p_sys->i_state = STATE_NOSYNC;
298 /* So p_block doesn't get re-added several times */
299 *pp_block = block_BytestreamPop( &p_sys->bytestream );
301 p_sys->i_state = STATE_NOSYNC;
308 /****************************************************************************
309 * PacketizeAVC1: the whole thing
310 ****************************************************************************/
311 static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
313 decoder_sys_t *p_sys = p_dec->p_sys;
315 block_t *p_ret = NULL;
318 if( !pp_block || !*pp_block ) return NULL;
323 for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
329 for( i = 0; i < p_sys->i_avcC_length_size; i++ )
331 i_size = (i_size << 8) | (*p++);
336 block_t *p_part = nal_get_annexeb( p_dec, p, i_size );
338 p_part->i_dts = p_block->i_dts;
339 p_part->i_pts = p_block->i_pts;
342 if( ( p_pic = ParseNALBlock( p_dec, p_part ) ) )
344 block_ChainAppend( &p_ret, p_pic );
353 static block_t *nal_get_annexeb( decoder_t *p_dec, uint8_t *p, int i_size )
357 p_nal = block_New( p_dec, 3 + i_size );
360 p_nal->p_buffer[0] = 0x00;
361 p_nal->p_buffer[1] = 0x00;
362 p_nal->p_buffer[2] = 0x01;
365 memcpy( &p_nal->p_buffer[3], p, i_size );
370 static void nal_get_decoded( uint8_t **pp_ret, int *pi_ret,
371 uint8_t *src, int i_src )
373 uint8_t *end = &src[i_src];
374 uint8_t *dst = malloc( i_src );
380 if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
392 *pi_ret = dst - *pp_ret;
395 static inline int bs_read_ue( bs_t *s )
399 while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
403 return( ( 1 << i) - 1 + bs_read( s, i ) );
406 static inline int bs_read_se( bs_t *s )
408 int val = bs_read_ue( s );
410 return val&0x01 ? (val+1)/2 : -(val/2);
414 static block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
416 decoder_sys_t *p_sys = p_dec->p_sys;
417 block_t *p_pic = NULL;
419 const int i_nal_ref_idc = (p_frag->p_buffer[3] >> 5)&0x03;
420 const int i_nal_type = p_frag->p_buffer[3]&0x1f;
422 if( p_sys->b_slice && !p_sys->b_sps )
424 block_ChainRelease( p_sys->p_frame );
425 msg_Warn( p_dec, "waiting for SPS" );
428 p_sys->p_frame = NULL;
429 p_sys->b_slice = VLC_FALSE;
433 i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
435 p_sys->b_slice = VLC_TRUE;
436 /* Fragment will be discarded later on */
438 else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
441 int i_dec, i_first_mb, i_slice_type, i_frame_num, i_pic_flags = 0;
442 vlc_bool_t b_pic = VLC_FALSE;
445 /* do not convert the whole frame */
446 nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[4],
447 __MIN( p_frag->i_buffer - 4, 60 ) );
448 bs_init( &s, dec, i_dec );
450 /* first_mb_in_slice */
451 i_first_mb = bs_read_ue( &s );
454 switch( (i_slice_type = bs_read_ue( &s )) )
457 i_pic_flags = BLOCK_FLAG_TYPE_P;
460 i_pic_flags = BLOCK_FLAG_TYPE_B;
463 i_pic_flags = BLOCK_FLAG_TYPE_I;
465 case 3: case 8: /* SP */
466 i_pic_flags = BLOCK_FLAG_TYPE_P;
469 i_pic_flags = BLOCK_FLAG_TYPE_I;
473 /* pic_parameter_set_id */
476 i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );
478 /* Detection of the first VCL NAL unit of a primary coded picture
480 if( i_frame_num != p_sys->i_frame_num ||
481 ( (i_nal_ref_idc != p_sys->i_nal_ref_idc) &&
482 (!i_nal_ref_idc || !p_sys->i_nal_ref_idc) ) )
486 p_sys->i_frame_num = i_frame_num;
487 p_sys->i_nal_ref_idc = i_nal_ref_idc;
489 if( !p_sys->b_frame_mbs_only )
492 if( bs_read( &s, 1 ) )
494 /* bottom_field_flag */
499 if( i_nal_type == NAL_SLICE_IDR )
502 int i_idr_pic_id = bs_read_ue( &s );
503 if( p_sys->i_nal_type != i_nal_type ) b_pic = VLC_TRUE;
504 if( p_sys->i_idr_pic_id != i_idr_pic_id ) b_pic = VLC_TRUE;
505 p_sys->i_idr_pic_id = i_idr_pic_id;
507 p_sys->i_nal_type = i_nal_type;
509 if( b_pic && p_sys->b_slice )
511 p_pic = block_ChainGather( p_sys->p_frame );
512 p_pic->i_dts = p_sys->i_dts;
513 p_pic->i_pts = p_sys->i_pts;
514 p_pic->i_length = 0; /* FIXME */
515 p_pic->i_flags = p_sys->i_flags;
518 p_sys->p_frame = NULL;
519 p_sys->b_slice = VLC_FALSE;
522 p_sys->b_slice = VLC_TRUE;
523 p_sys->i_flags = i_pic_flags;
524 p_sys->i_dts = p_frag->i_dts;
525 p_sys->i_pts = p_frag->i_pts;
529 else if( i_nal_type == NAL_SPS )
536 msg_Dbg( p_dec, "found NAL_SPS" );
538 p_sys->b_sps = VLC_TRUE;
540 nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[4],
541 p_frag->i_buffer - 4 );
543 bs_init( &s, dec, i_dec );
544 /* Skip profile(8), constraint_set012, reserver(5), level(8) */
545 bs_skip( &s, 8 + 1+1+1 + 5 + 8 );
548 /* Skip i_log2_max_frame_num */
549 p_sys->i_log2_max_frame_num = bs_read_ue( &s );
551 i_tmp = bs_read_ue( &s );
554 /* skip i_log2_max_poc_lsb */
557 else if( i_tmp == 1 )
560 /* skip b_delta_pic_order_always_zero */
562 /* skip i_offset_for_non_ref_pic */
564 /* skip i_offset_for_top_to_bottom_field */
566 /* read i_num_ref_frames_in_poc_cycle */
567 i_cycle = bs_read_ue( &s );
568 if( i_cycle > 256 ) i_cycle = 256;
571 /* skip i_offset_for_ref_frame */
575 /* i_num_ref_frames */
577 /* b_gaps_in_frame_num_value_allowed */
581 p_dec->fmt_out.video.i_width = 16 * ( bs_read_ue( &s ) + 1 );
582 p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );
584 /* b_frame_mbs_only */
585 p_sys->b_frame_mbs_only = bs_read( &s, 1 );
586 if( p_sys->b_frame_mbs_only == 0 )
590 /* b_direct8x8_inference */
594 i_tmp = bs_read( &s, 1 );
608 i_tmp = bs_read( &s, 1 );
611 /* read the aspect ratio part if any FIXME check it */
612 i_tmp = bs_read( &s, 1 );
615 static const struct { int w, h; } sar[14] =
617 { 0, 0 }, { 1, 1 }, { 12, 11 }, { 10, 11 },
618 { 16, 11 }, { 40, 33 }, { 24, 11 }, { 20, 11 },
619 { 32, 11 }, { 80, 33 }, { 18, 11 }, { 15, 11 },
620 { 64, 33 }, { 160,99 },
622 int i_sar = bs_read( &s, 8 );
632 w = bs_read( &s, 16 );
633 h = bs_read( &s, 16 );
635 p_dec->fmt_out.video.i_aspect =
636 VOUT_ASPECT_FACTOR * w / h * p_dec->fmt_out.video.i_width /
637 p_dec->fmt_out.video.i_height;
643 else if( i_nal_type == NAL_PPS )
646 bs_init( &s, &p_frag->p_buffer[4], p_frag->i_buffer - 4 );
649 msg_Dbg( p_dec, "found NAL_PPS" );
652 /* Append the block */
653 block_ChainAppend( &p_sys->p_frame, p_frag );