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 */
100 NAL_SLICE_IDR = 5, /* ref_idc != 0 */
101 NAL_SEI = 6, /* ref_idc == 0 */
104 /* ref_idc == 0 for 6,9,10,11,12 */
109 NAL_PRIORITY_DISPOSABLE = 0,
110 NAL_PRIORITY_LOW = 1,
111 NAL_PRIORITY_HIGH = 2,
112 NAL_PRIORITY_HIGHEST = 3,
115 static block_t *ParseNALBlock( decoder_t *, block_t * );
117 static block_t *nal_get_annexeb( decoder_t *, uint8_t *p, int );
119 /*****************************************************************************
120 * Open: probe the packetizer and return score
121 *****************************************************************************/
122 static int Open( vlc_object_t *p_this )
124 decoder_t *p_dec = (decoder_t*)p_this;
125 decoder_sys_t *p_sys;
127 if( p_dec->fmt_in.i_codec != VLC_FOURCC( 'h', '2', '6', '4') &&
128 p_dec->fmt_in.i_codec != VLC_FOURCC( 'H', '2', '6', '4') &&
129 p_dec->fmt_in.i_codec != VLC_FOURCC( 'V', 'S', 'S', 'H') &&
130 p_dec->fmt_in.i_codec != VLC_FOURCC( 'v', 's', 's', 'h') &&
131 ( p_dec->fmt_in.i_codec != VLC_FOURCC( 'a', 'v', 'c', '1') ||
132 p_dec->fmt_in.i_extra < 7 ) )
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 msg_Err( p_dec, "out of memory" );
143 p_sys->i_state = STATE_NOSYNC;
145 p_sys->startcode[0] = 0;
146 p_sys->startcode[1] = 0;
147 p_sys->startcode[2] = 0;
148 p_sys->startcode[3] = 1;
149 p_sys->bytestream = block_BytestreamInit( p_dec );
150 p_sys->b_slice = VLC_FALSE;
151 p_sys->p_frame = NULL;
155 p_sys->b_sps = VLC_FALSE;
157 p_sys->i_nal_type = -1;
158 p_sys->i_idr_pic_id = -1;
159 p_sys->i_frame_num = -1;
161 /* Setup properties */
162 es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
163 p_dec->fmt_out.i_codec = VLC_FOURCC( 'h', '2', '6', '4' );
165 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
167 uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
172 p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);
177 for( i = 0; i < i_sps; i++ )
179 int i_length = GetWBE( p );
180 block_t *p_sps = nal_get_annexeb( p_dec, p+2, i_length );
182 ParseNALBlock( p_dec, p_sps );
187 for( i = 0; i < i_pps; i++ )
189 int i_length = GetWBE( p );
190 block_t *p_pps = nal_get_annexeb( p_dec, p+2, i_length );
192 ParseNALBlock( p_dec, p_pps );
195 msg_Dbg( p_dec, "avcC length size=%d sps=%d pps=%d",
196 p_sys->i_avcC_length_size, i_sps, i_pps );
199 p_dec->pf_packetize = PacketizeAVC1;
204 p_dec->pf_packetize = Packetize;
210 /*****************************************************************************
211 * Close: clean up the packetizer
212 *****************************************************************************/
213 static void Close( vlc_object_t *p_this )
215 decoder_t *p_dec = (decoder_t*)p_this;
216 decoder_sys_t *p_sys = p_dec->p_sys;
218 block_BytestreamRelease( &p_sys->bytestream );
222 /****************************************************************************
223 * Packetize: the whole thing
224 ****************************************************************************/
225 static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
227 decoder_sys_t *p_sys = p_dec->p_sys;
230 if( !pp_block || !*pp_block ) return NULL;
232 block_BytestreamPush( &p_sys->bytestream, *pp_block );
236 switch( p_sys->i_state )
239 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
240 &p_sys->i_offset, p_sys->startcode, 4 ) == VLC_SUCCESS )
242 p_sys->i_state = STATE_NEXT_SYNC;
245 if( p_sys->i_offset )
247 block_SkipBytes( &p_sys->bytestream, p_sys->i_offset );
249 block_BytestreamFlush( &p_sys->bytestream );
252 if( p_sys->i_state != STATE_NEXT_SYNC )
258 p_sys->i_offset = 1; /* To find next startcode */
260 case STATE_NEXT_SYNC:
261 /* Find the next startcode */
262 if( block_FindStartcodeFromOffset( &p_sys->bytestream,
263 &p_sys->i_offset, p_sys->startcode, 4 ) != VLC_SUCCESS )
269 /* Get the new fragment and set the pts/dts */
270 p_pic = block_New( p_dec, p_sys->i_offset );
271 p_pic->i_pts = p_sys->bytestream.p_block->i_pts;
272 p_pic->i_dts = p_sys->bytestream.p_block->i_dts;
274 block_GetBytes( &p_sys->bytestream, p_pic->p_buffer,
280 if( !( p_pic = ParseNALBlock( p_dec, p_pic ) ) )
282 p_sys->i_state = STATE_NOSYNC;
286 /* So p_block doesn't get re-added several times */
287 *pp_block = block_BytestreamPop( &p_sys->bytestream );
289 p_sys->i_state = STATE_NOSYNC;
296 /****************************************************************************
297 * PacketizeAVC1: the whole thing
298 ****************************************************************************/
299 static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
301 decoder_sys_t *p_sys = p_dec->p_sys;
303 block_t *p_ret = NULL;
306 if( !pp_block || !*pp_block ) return NULL;
311 for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
317 for( i = 0; i < p_sys->i_avcC_length_size; i++ )
319 i_size = (i_size << 8) | (*p++);
324 block_t *p_part = nal_get_annexeb( p_dec, p, i_size );
326 p_part->i_dts = p_block->i_dts;
327 p_part->i_pts = p_block->i_pts;
330 if( ( p_pic = ParseNALBlock( p_dec, p_part ) ) )
332 block_ChainAppend( &p_ret, p_pic );
341 static block_t *nal_get_annexeb( decoder_t *p_dec, uint8_t *p, int i_size )
345 p_nal = block_New( p_dec, 4 + i_size );
348 p_nal->p_buffer[0] = 0x00;
349 p_nal->p_buffer[1] = 0x00;
350 p_nal->p_buffer[2] = 0x00;
351 p_nal->p_buffer[3] = 0x01;
354 memcpy( &p_nal->p_buffer[4], p, i_size );
359 static void nal_get_decoded( uint8_t **pp_ret, int *pi_ret,
360 uint8_t *src, int i_src )
362 uint8_t *end = &src[i_src];
363 uint8_t *dst = malloc( i_src );
369 if( src < end - 3 && src[0] == 0x00 && src[1] == 0x00 &&
381 *pi_ret = dst - *pp_ret;
384 static inline int bs_read_ue( bs_t *s )
388 while( bs_read1( s ) == 0 && s->p < s->p_end && i < 32 )
392 return( ( 1 << i) - 1 + bs_read( s, i ) );
395 static inline int bs_read_se( bs_t *s )
397 int val = bs_read_ue( s );
399 return val&0x01 ? (val+1)/2 : -(val/2);
403 static block_t *ParseNALBlock( decoder_t *p_dec, block_t *p_frag )
405 decoder_sys_t *p_sys = p_dec->p_sys;
406 block_t *p_pic = NULL;
408 const int i_ref_idc = (p_frag->p_buffer[4] >> 5)&0x03;
409 const int i_nal_type = p_frag->p_buffer[4]&0x1f;
411 if( p_sys->b_slice && !p_sys->b_sps )
413 block_ChainRelease( p_sys->p_frame );
414 msg_Warn( p_dec, "waiting for SPS" );
417 p_sys->p_frame = NULL;
418 p_sys->b_slice = VLC_FALSE;
422 i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
424 p_sys->b_slice = VLC_TRUE;
425 /* Fragment will be discarded later on */
427 else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
430 int i_dec, i_first_mb, i_slice_type, i_frame_num, i_pic_flags = 0;
431 vlc_bool_t b_pic = VLC_FALSE;
434 /* do not convert the whole frame */
435 nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
436 __MIN( p_frag->i_buffer - 5, 60 ) );
437 bs_init( &s, dec, i_dec );
439 /* first_mb_in_slice */
440 i_first_mb = bs_read_ue( &s );
443 switch( (i_slice_type = bs_read_ue( &s )) )
446 i_pic_flags = BLOCK_FLAG_TYPE_P;
449 i_pic_flags = BLOCK_FLAG_TYPE_B;
452 i_pic_flags = BLOCK_FLAG_TYPE_I;
454 case 3: case 8: /* SP */
455 i_pic_flags = BLOCK_FLAG_TYPE_P;
458 i_pic_flags = BLOCK_FLAG_TYPE_I;
462 /* pic_parameter_set_id */
465 i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );
467 if( i_nal_type != NAL_SLICE_IDR && i_frame_num != p_sys->i_frame_num )
471 p_sys->i_frame_num = i_frame_num;
473 if( !p_sys->b_frame_mbs_only )
476 if( bs_read( &s, 1 ) )
478 /* bottom_field_flag */
483 if( i_nal_type == NAL_SLICE_IDR )
486 int i_idr_pic_id = bs_read_ue( &s );
487 if( p_sys->i_nal_type != i_nal_type ) b_pic = VLC_TRUE;
488 if( p_sys->i_idr_pic_id != i_idr_pic_id ) b_pic = VLC_TRUE;
489 p_sys->i_idr_pic_id = i_idr_pic_id;
491 p_sys->i_nal_type = i_nal_type;
493 if( b_pic && p_sys->b_slice )
495 p_pic = block_ChainGather( p_sys->p_frame );
496 p_pic->i_dts = p_sys->i_dts;
497 p_pic->i_pts = p_sys->i_pts;
498 p_pic->i_length = 0; /* FIXME */
499 p_pic->i_flags = p_sys->i_flags;
502 p_sys->p_frame = NULL;
503 p_sys->b_slice = VLC_FALSE;
506 p_sys->b_slice = VLC_TRUE;
507 p_sys->i_flags = i_pic_flags;
508 p_sys->i_dts = p_frag->i_dts;
509 p_sys->i_pts = p_frag->i_pts;
513 else if( i_nal_type == NAL_SPS )
520 msg_Dbg( p_dec, "found NAL_SPS" );
522 p_sys->b_sps = VLC_TRUE;
524 nal_get_decoded( &dec, &i_dec, &p_frag->p_buffer[5],
525 p_frag->i_buffer - 5 );
527 bs_init( &s, dec, i_dec );
528 /* Skip profile(8), constraint_set012, reserver(5), level(8) */
529 bs_skip( &s, 8 + 1+1+1 + 5 + 8 );
532 /* Skip i_log2_max_frame_num */
533 p_sys->i_log2_max_frame_num = bs_read_ue( &s );
535 i_tmp = bs_read_ue( &s );
538 /* skip i_log2_max_poc_lsb */
541 else if( i_tmp == 1 )
544 /* skip b_delta_pic_order_always_zero */
546 /* skip i_offset_for_non_ref_pic */
548 /* skip i_offset_for_top_to_bottom_field */
550 /* read i_num_ref_frames_in_poc_cycle */
551 i_cycle = bs_read_ue( &s );
552 if( i_cycle > 256 ) i_cycle = 256;
555 /* skip i_offset_for_ref_frame */
559 /* i_num_ref_frames */
561 /* b_gaps_in_frame_num_value_allowed */
565 p_dec->fmt_out.video.i_width = 16 * ( bs_read_ue( &s ) + 1 );
566 p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );
568 /* b_frame_mbs_only */
569 p_sys->b_frame_mbs_only = bs_read( &s, 1 );
570 if( p_sys->b_frame_mbs_only == 0 )
574 /* b_direct8x8_inference */
578 i_tmp = bs_read( &s, 1 );
582 p_dec->fmt_out.video.i_width -= 2 * bs_read_ue( &s );
584 p_dec->fmt_out.video.i_width -= 2 * bs_read_ue( &s );
586 p_dec->fmt_out.video.i_height -= 2 * bs_read_ue( &s );
588 p_dec->fmt_out.video.i_height -= 2 * bs_read_ue( &s );
592 i_tmp = bs_read( &s, 1 );
595 /* read the aspect ratio part if any FIXME check it */
596 i_tmp = bs_read( &s, 1 );
599 static const struct { int w, h; } sar[14] =
601 { 0, 0 }, { 1, 1 }, { 12, 11 }, { 10, 11 },
602 { 16, 11 }, { 40, 33 }, { 24, 11 }, { 20, 11 },
603 { 32, 11 }, { 80, 33 }, { 18, 11 }, { 15, 11 },
604 { 64, 33 }, { 160,99 },
606 int i_sar = bs_read( &s, 8 );
616 w = bs_read( &s, 16 );
617 h = bs_read( &s, 16 );
619 p_dec->fmt_out.video.i_aspect =
620 VOUT_ASPECT_FACTOR * w / h * p_dec->fmt_out.video.i_width /
621 p_dec->fmt_out.video.i_height;
627 else if( i_nal_type == NAL_PPS )
630 bs_init( &s, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
633 msg_Dbg( p_dec, "found NAL_PPS" );
636 /* Append the block */
637 block_ChainAppend( &p_sys->p_frame, p_frag );