h264.c 41 KB
Newer Older
1 2 3
/*****************************************************************************
 * h264.c: h264/avc video packetizer
 *****************************************************************************
Jean-Baptiste Kempf's avatar
LGPL  
Jean-Baptiste Kempf committed
4
 * Copyright (C) 2001, 2002, 2006 VLC authors and VideoLAN
5
 * $Id$
6 7 8
 *
 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
 *          Eric Petit <titer@videolan.org>
9
 *          Gildas Bazin <gbazin@videolan.org>
10
 *          Derk-Jan Hartman <hartman at videolan dot org>
11
 *
Jean-Baptiste Kempf's avatar
LGPL  
Jean-Baptiste Kempf committed
12 13 14
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
15 16 17 18
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
Jean-Baptiste Kempf's avatar
LGPL  
Jean-Baptiste Kempf committed
19 20
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
21
 *
Jean-Baptiste Kempf's avatar
LGPL  
Jean-Baptiste Kempf committed
22 23 24
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25 26 27 28 29 30
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/

31 32 33 34
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

35
#include <vlc_common.h>
36
#include <vlc_plugin.h>
Clément Stenac's avatar
Clément Stenac committed
37 38 39
#include <vlc_sout.h>
#include <vlc_codec.h>
#include <vlc_block.h>
40

41 42
#include <vlc_block_helper.h>
#include <vlc_bits.h>
43
#include "../codec/cc.h"
44
#include "h264_nal.h"
45
#include "packetizer_helper.h"
46
#include "../demux/mpeg/mpeg_parser_helpers.h"
47 48 49 50 51 52 53

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
static int  Open ( vlc_object_t * );
static void Close( vlc_object_t * );

54 55 56 57 58 59 60
vlc_module_begin ()
    set_category( CAT_SOUT )
    set_subcategory( SUBCAT_SOUT_PACKETIZER )
    set_description( N_("H.264 video packetizer") )
    set_capability( "packetizer", 50 )
    set_callbacks( Open, Close )
vlc_module_end ()
61 62 63 64 65


/****************************************************************************
 * Local prototypes
 ****************************************************************************/
66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
typedef struct
{
    int i_nal_type;
    int i_nal_ref_idc;

    int i_frame_type;
    int i_pic_parameter_set_id;
    int i_frame_num;

    int i_field_pic_flag;
    int i_bottom_field_flag;

    int i_idr_pic_id;

    int i_pic_order_cnt_lsb;
    int i_delta_pic_order_cnt_bottom;

    int i_delta_pic_order_cnt0;
    int i_delta_pic_order_cnt1;
} slice_t;

87 88
#define SPS_MAX (32)
#define PPS_MAX (256)
89 90
struct decoder_sys_t
{
91 92
    /* */
    packetizer_t packetizer;
93

94
    /* */
95 96
    bool    b_slice;
    block_t *p_frame;
97 98
    bool    b_frame_sps;
    bool    b_frame_pps;
99

100
    bool   b_header;
101 102
    bool   b_sps;
    bool   b_pps;
103 104
    block_t *pp_sps[SPS_MAX];
    block_t *pp_pps[PPS_MAX];
105
    int    i_recovery_frames;  /* -1 = no recovery */
106 107 108

    /* avcC data */
    int i_avcC_length_size;
109 110 111 112

    /* Useful values of the Sequence Parameter Set */
    int i_log2_max_frame_num;
    int b_frame_mbs_only;
113 114 115 116 117 118
    int i_pic_order_cnt_type;
    int i_delta_pic_order_always_zero_flag;
    int i_log2_max_pic_order_cnt_lsb;

    /* Value from Picture Parameter Set */
    int i_pic_order_present_flag;
119

120 121 122 123 124 125 126 127 128 129 130
    /* VUI */
    bool b_timing_info_present_flag;
    uint32_t i_num_units_in_tick;
    uint32_t i_time_scale;
    bool b_fixed_frame_rate;
    bool b_pic_struct_present_flag;
    uint8_t i_pic_struct;
    bool b_cpb_dpb_delays_present_flag;
    uint8_t i_cpb_removal_delay_length_minus1;
    uint8_t i_dpb_output_delay_length_minus1;

131
    /* Useful values of the Slice Header */
132
    slice_t slice;
Laurent Aimar's avatar
Laurent Aimar committed
133 134

    /* */
135
    bool b_even_frame;
Laurent Aimar's avatar
Laurent Aimar committed
136 137
    mtime_t i_frame_pts;
    mtime_t i_frame_dts;
138 139
    mtime_t i_prev_pts;
    mtime_t i_prev_dts;
140 141 142 143 144 145

    /* */
    uint32_t i_cc_flags;
    mtime_t i_cc_pts;
    mtime_t i_cc_dts;
    cc_data_t cc;
146 147

    cc_data_t cc_next;
148 149 150 151 152 153 154 155 156 157 158 159
};

enum nal_unit_type_e
{
    NAL_UNKNOWN = 0,
    NAL_SLICE   = 1,
    NAL_SLICE_DPA   = 2,
    NAL_SLICE_DPB   = 3,
    NAL_SLICE_DPC   = 4,
    NAL_SLICE_IDR   = 5,    /* ref_idc != 0 */
    NAL_SEI         = 6,    /* ref_idc == 0 */
    NAL_SPS         = 7,
160 161
    NAL_PPS         = 8,
    NAL_AU_DELIMITER= 9
162 163 164
    /* ref_idc == 0 for 6,9,10,11,12 */
};

165 166 167
/* Defined in H.264 annex D */
enum sei_type_e
{
168
    SEI_PIC_TIMING = 1,
169 170 171 172
    SEI_USER_DATA_REGISTERED = 4,
    SEI_RECOVERY_POINT = 6
};

173 174
#define BLOCK_FLAG_PRIVATE_AUD (1 << BLOCK_FLAG_PRIVATE_SHIFT)

175 176 177
static block_t *Packetize( decoder_t *, block_t ** );
static block_t *PacketizeAVC1( decoder_t *, block_t ** );
static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] );
178

179 180 181 182
static void PacketizeReset( void *p_private, bool b_broken );
static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t * );
static int PacketizeValidate( void *p_private, block_t * );

183
static block_t *ParseNALBlock( decoder_t *, bool *pb_ts_used, block_t * );
Laurent Aimar's avatar
Laurent Aimar committed
184
static block_t *CreateAnnexbNAL( decoder_t *, const uint8_t *p, int );
185

186 187 188 189 190
static block_t *OutputPicture( decoder_t *p_dec );
static void PutSPS( decoder_t *p_dec, block_t *p_frag );
static void PutPPS( decoder_t *p_dec, block_t *p_frag );
static void ParseSlice( decoder_t *p_dec, bool *pb_new_picture, slice_t *p_slice,
                        int i_nal_ref_idc, int i_nal_type, const block_t *p_frag );
191
static void ParseSei( decoder_t *, block_t * );
192 193


194 195
static const uint8_t p_h264_startcode[3] = { 0x00, 0x00, 0x01 };

196 197
/*****************************************************************************
 * Open: probe the packetizer and return score
198 199
 * When opening after demux, the packetizer is only loaded AFTER the decoder
 * That means that what you set in fmt_out is ignored by the decoder in this special case
200 201 202 203 204
 *****************************************************************************/
static int Open( vlc_object_t *p_this )
{
    decoder_t     *p_dec = (decoder_t*)p_this;
    decoder_sys_t *p_sys;
205
    int i;
206

207 208 209 210
    if( p_dec->fmt_in.i_codec != VLC_CODEC_H264 )
        return VLC_EGENERIC;
    if( p_dec->fmt_in.i_original_fourcc == VLC_FOURCC( 'a', 'v', 'c', '1') &&
        p_dec->fmt_in.i_extra < 7 )
211 212 213 214 215
        return VLC_EGENERIC;

    /* Allocate the memory needed to store the decoder's structure */
    if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
    {
216
        return VLC_ENOMEM;
217
    }
218 219 220

    packetizer_Init( &p_sys->packetizer,
                     p_h264_startcode, sizeof(p_h264_startcode),
221
                     p_h264_startcode, 1, 5,
222 223
                     PacketizeReset, PacketizeParse, PacketizeValidate, p_dec );

224
    p_sys->b_slice = false;
225
    p_sys->p_frame = NULL;
226 227 228
    p_sys->b_frame_sps = false;
    p_sys->b_frame_pps = false;

229
    p_sys->b_header= false;
230 231
    p_sys->b_sps   = false;
    p_sys->b_pps   = false;
232 233 234 235
    for( i = 0; i < SPS_MAX; i++ )
        p_sys->pp_sps[i] = NULL;
    for( i = 0; i < PPS_MAX; i++ )
        p_sys->pp_pps[i] = NULL;
236
    p_sys->i_recovery_frames = -1;
237

238 239 240 241 242 243 244 245 246 247
    p_sys->slice.i_nal_type = -1;
    p_sys->slice.i_nal_ref_idc = -1;
    p_sys->slice.i_idr_pic_id = -1;
    p_sys->slice.i_frame_num = -1;
    p_sys->slice.i_frame_type = 0;
    p_sys->slice.i_pic_parameter_set_id = -1;
    p_sys->slice.i_field_pic_flag = 0;
    p_sys->slice.i_bottom_field_flag = -1;
    p_sys->slice.i_pic_order_cnt_lsb = -1;
    p_sys->slice.i_delta_pic_order_cnt_bottom = -1;
248

249 250 251 252 253 254
    p_sys->b_timing_info_present_flag = false;
    p_sys->b_pic_struct_present_flag = false;
    p_sys->b_cpb_dpb_delays_present_flag = false;
    p_sys->i_cpb_removal_delay_length_minus1 = 0;
    p_sys->i_dpb_output_delay_length_minus1 = 0;

255
    p_sys->b_even_frame = false;
256 257
    p_sys->i_frame_dts = VLC_TS_INVALID;
    p_sys->i_frame_pts = VLC_TS_INVALID;
258 259
    p_sys->i_prev_dts = VLC_TS_INVALID;
    p_sys->i_prev_pts = VLC_TS_INVALID;
Laurent Aimar's avatar
Laurent Aimar committed
260

261 262
    /* Setup properties */
    es_format_Copy( &p_dec->fmt_out, &p_dec->fmt_in );
263
    p_dec->fmt_out.i_codec = VLC_CODEC_H264;
264

265
    if( p_dec->fmt_in.i_original_fourcc == VLC_FOURCC( 'a', 'v', 'c', '1' ) )
266
    {
267 268 269 270
        /* This type of stream is produced by mp4 and matroska
         * when we want to store it in another streamformat, you need to convert
         * The fmt_in.p_extra should ALWAYS contain the avcC
         * The fmt_out.p_extra should contain all the SPS and PPS with 4 byte startcodes */
271 272
        uint8_t *p = &((uint8_t*)p_dec->fmt_in.p_extra)[4];
        int i_sps, i_pps;
Laurent Aimar's avatar
Laurent Aimar committed
273
        bool b_dummy;
274 275 276 277 278 279 280 281 282
        int i;

        /* Parse avcC */
        p_sys->i_avcC_length_size = 1 + ((*p++)&0x03);

        /* Read SPS */
        i_sps = (*p++)&0x1f;
        for( i = 0; i < i_sps; i++ )
        {
283 284 285 286 287 288
            uint16_t i_length = GetWBE( p ); p += 2;
            if( i_length >
                (uint8_t*)p_dec->fmt_in.p_extra + p_dec->fmt_in.i_extra - p )
            {
                return VLC_EGENERIC;
            }
Laurent Aimar's avatar
Laurent Aimar committed
289
            block_t *p_sps = CreateAnnexbNAL( p_dec, p, i_length );
290 291
            if( !p_sps )
                return VLC_EGENERIC;
Laurent Aimar's avatar
Laurent Aimar committed
292
            ParseNALBlock( p_dec, &b_dummy, p_sps );
293
            p += i_length;
294 295 296 297 298
        }
        /* Read PPS */
        i_pps = *p++;
        for( i = 0; i < i_pps; i++ )
        {
299 300 301 302 303 304
            uint16_t i_length = GetWBE( p ); p += 2;
            if( i_length >
                (uint8_t*)p_dec->fmt_in.p_extra + p_dec->fmt_in.i_extra - p )
            {
                return VLC_EGENERIC;
            }
Laurent Aimar's avatar
Laurent Aimar committed
305
            block_t *p_pps = CreateAnnexbNAL( p_dec, p, i_length );
306 307
            if( !p_pps )
                return VLC_EGENERIC;
Laurent Aimar's avatar
Laurent Aimar committed
308
            ParseNALBlock( p_dec, &b_dummy, p_pps );
309
            p += i_length;
310
        }
311
        msg_Dbg( p_dec, "avcC length size=%d, sps=%d, pps=%d",
312 313
                 p_sys->i_avcC_length_size, i_sps, i_pps );

314
        if( !p_sys->b_sps || !p_sys->b_pps )
315 316
            return VLC_EGENERIC;

317
        /* FIXME: FFMPEG isn't happy at all if you leave this */
318 319
        if( p_dec->fmt_out.i_extra > 0 )
            free( p_dec->fmt_out.p_extra );
320 321
        p_dec->fmt_out.i_extra = 0;
        p_dec->fmt_out.p_extra = NULL;
322

323
        /* Set the new extradata */
324 325 326 327 328 329 330 331 332 333
        for( i = 0; i < SPS_MAX; i++ )
        {
            if( p_sys->pp_sps[i] )
                p_dec->fmt_out.i_extra += p_sys->pp_sps[i]->i_buffer;
        }
        for( i = 0; i < PPS_MAX; i++ )
        {
            if( p_sys->pp_pps[i] )
                p_dec->fmt_out.i_extra += p_sys->pp_pps[i]->i_buffer;
        }
334
        p_dec->fmt_out.p_extra = malloc( p_dec->fmt_out.i_extra );
335 336
        if( p_dec->fmt_out.p_extra )
        {
337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354
            uint8_t *p_dst = p_dec->fmt_out.p_extra;

            for( i = 0; i < SPS_MAX; i++ )
            {
                if( p_sys->pp_sps[i] )
                {
                    memcpy( p_dst, p_sys->pp_sps[i]->p_buffer, p_sys->pp_sps[i]->i_buffer );
                    p_dst += p_sys->pp_sps[i]->i_buffer;
                }
            }
            for( i = 0; i < PPS_MAX; i++ )
            {
                if( p_sys->pp_pps[i] )
                {
                    memcpy( p_dst, p_sys->pp_pps[i]->p_buffer, p_sys->pp_pps[i]->i_buffer );
                    p_dst += p_sys->pp_pps[i]->i_buffer;
                }
            }
355
            p_sys->b_header = true;
356
        }
357 358 359 360
        else
        {
            p_dec->fmt_out.i_extra = 0;
        }
361

362 363
        /* Set callback */
        p_dec->pf_packetize = PacketizeAVC1;
364
        /* TODO CC ? */
365 366 367
    }
    else
    {
368
        /* This type of stream contains data with 3 of 4 byte startcodes
369 370
         * The fmt_in.p_extra MAY contain SPS/PPS with 4 byte startcodes
         * The fmt_out.p_extra should be the same */
371

372 373
        /* Set callback */
        p_dec->pf_packetize = Packetize;
374 375 376
        p_dec->pf_get_cc = GetCc;

        /* */
377 378
        p_sys->i_cc_pts = VLC_TS_INVALID;
        p_sys->i_cc_dts = VLC_TS_INVALID;
379 380
        p_sys->i_cc_flags = 0;
        cc_Init( &p_sys->cc );
381
        cc_Init( &p_sys->cc_next );
382 383 384

        /* */
        if( p_dec->fmt_in.i_extra > 0 )
385 386
            packetizer_Header( &p_sys->packetizer,
                               p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra );
387 388 389 390 391 392 393 394 395 396 397 398
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close: clean up the packetizer
 *****************************************************************************/
static void Close( vlc_object_t *p_this )
{
    decoder_t *p_dec = (decoder_t*)p_this;
    decoder_sys_t *p_sys = p_dec->p_sys;
399
    int i;
400

401 402
    if( p_sys->p_frame )
        block_ChainRelease( p_sys->p_frame );
403 404 405 406 407 408 409 410 411 412
    for( i = 0; i < SPS_MAX; i++ )
    {
        if( p_sys->pp_sps[i] )
            block_Release( p_sys->pp_sps[i] );
    }
    for( i = 0; i < PPS_MAX; i++ )
    {
        if( p_sys->pp_pps[i] )
            block_Release( p_sys->pp_pps[i] );
    }
413 414
    packetizer_Clean( &p_sys->packetizer );

415
    if( p_dec->pf_get_cc )
416 417
    {
         cc_Exit( &p_sys->cc_next );
418
         cc_Exit( &p_sys->cc );
419
    }
420

421 422 423 424 425
    free( p_sys );
}

/****************************************************************************
 * Packetize: the whole thing
426 427
 * Search for the startcodes 3 or more bytes
 * Feed ParseNALBlock ALWAYS with 4 byte startcode prepended NALs
428 429 430 431 432
 ****************************************************************************/
static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
{
    decoder_sys_t *p_sys = p_dec->p_sys;

433
    return packetizer_Packetize( &p_sys->packetizer, pp_block );
434 435
}

436
/****************************************************************************
437 438
 * PacketizeAVC1: Takes VCL blocks of data and creates annexe B type NAL stream
 * Will always use 4 byte 0 0 0 1 startcodes
439
 * Will prepend a SPS and PPS before each keyframe
440 441 442 443 444 445 446 447
 ****************************************************************************/
static block_t *PacketizeAVC1( decoder_t *p_dec, block_t **pp_block )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    block_t       *p_block;
    block_t       *p_ret = NULL;
    uint8_t       *p;

448 449 450 451 452 453 454
    if( !pp_block || !*pp_block )
        return NULL;
    if( (*pp_block)->i_flags&(BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
    {
        block_Release( *pp_block );
        return NULL;
    }
455 456 457 458 459 460 461

    p_block = *pp_block;
    *pp_block = NULL;

    for( p = p_block->p_buffer; p < &p_block->p_buffer[p_block->i_buffer]; )
    {
        block_t *p_pic;
Laurent Aimar's avatar
Laurent Aimar committed
462
        bool b_dummy;
463 464 465 466 467 468 469 470
        int i_size = 0;
        int i;

        for( i = 0; i < p_sys->i_avcC_length_size; i++ )
        {
            i_size = (i_size << 8) | (*p++);
        }

471
        if( i_size <= 0 ||
472
            i_size > ( p_block->p_buffer + p_block->i_buffer - p ) )
473
        {
474 475 476
            msg_Err( p_dec, "Broken frame : size %d is too big", i_size );
            break;
        }
477

Laurent Aimar's avatar
Laurent Aimar committed
478
        block_t *p_part = CreateAnnexbNAL( p_dec, p, i_size );
479 480
        if( !p_part )
            break;
Laurent Aimar's avatar
Laurent Aimar committed
481

482 483 484 485
        p_part->i_dts = p_block->i_dts;
        p_part->i_pts = p_block->i_pts;

        /* Parse the NAL */
Laurent Aimar's avatar
Laurent Aimar committed
486
        if( ( p_pic = ParseNALBlock( p_dec, &b_dummy, p_part ) ) )
487 488
        {
            block_ChainAppend( &p_ret, p_pic );
489 490 491
        }
        p += i_size;
    }
492
    block_Release( p_block );
493 494 495 496

    return p_ret;
}

497 498 499 500 501 502 503 504 505 506 507 508 509 510
/*****************************************************************************
 * GetCc:
 *****************************************************************************/
static block_t *GetCc( decoder_t *p_dec, bool pb_present[4] )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    block_t *p_cc;

    for( int i = 0; i < 4; i++ )
        pb_present[i] = p_sys->cc.pb_present[i];

    if( p_sys->cc.i_data <= 0 )
        return NULL;

511
    p_cc = block_Alloc( p_sys->cc.i_data);
512 513 514 515 516 517 518 519 520 521 522
    if( p_cc )
    {
        memcpy( p_cc->p_buffer, p_sys->cc.p_data, p_sys->cc.i_data );
        p_cc->i_dts =
        p_cc->i_pts = p_sys->cc.b_reorder ? p_sys->i_cc_pts : p_sys->i_cc_dts;
        p_cc->i_flags = ( p_sys->cc.b_reorder  ? p_sys->i_cc_flags : BLOCK_FLAG_TYPE_P ) & BLOCK_FLAG_TYPE_MASK;
    }
    cc_Flush( &p_sys->cc );
    return p_cc;
}

Laurent Aimar's avatar
Laurent Aimar committed
523 524 525
/****************************************************************************
 * Helpers
 ****************************************************************************/
526 527 528 529 530 531 532 533 534 535
static void PacketizeReset( void *p_private, bool b_broken )
{
    decoder_t *p_dec = p_private;
    decoder_sys_t *p_sys = p_dec->p_sys;

    if( b_broken )
    {
        if( p_sys->p_frame )
            block_ChainRelease( p_sys->p_frame );
        p_sys->p_frame = NULL;
536 537
        p_sys->b_frame_sps = false;
        p_sys->b_frame_pps = false;
538 539 540
        p_sys->slice.i_frame_type = 0;
        p_sys->b_slice = false;
    }
541 542
    p_sys->i_frame_pts = VLC_TS_INVALID;
    p_sys->i_frame_dts = VLC_TS_INVALID;
543 544 545
    p_sys->i_prev_dts = VLC_TS_INVALID;
    p_sys->i_prev_pts = VLC_TS_INVALID;
    p_sys->b_even_frame = false;
546 547 548 549 550 551
}
static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t *p_block )
{
    decoder_t *p_dec = p_private;

    /* Remove trailing 0 bytes */
552
    while( p_block->i_buffer > 5 && p_block->p_buffer[p_block->i_buffer-1] == 0x00 )
553 554 555 556 557 558 559 560 561 562 563
        p_block->i_buffer--;

    return ParseNALBlock( p_dec, pb_ts_used, p_block );
}
static int PacketizeValidate( void *p_private, block_t *p_au )
{
    VLC_UNUSED(p_private);
    VLC_UNUSED(p_au);
    return VLC_SUCCESS;
}

Laurent Aimar's avatar
Laurent Aimar committed
564
static block_t *CreateAnnexbNAL( decoder_t *p_dec, const uint8_t *p, int i_size )
565 566 567
{
    block_t *p_nal;

568
    p_nal = block_Alloc( 4 + i_size );
569
    if( !p_nal ) return NULL;
570

571 572 573
    /* Add start code */
    p_nal->p_buffer[0] = 0x00;
    p_nal->p_buffer[1] = 0x00;
574 575
    p_nal->p_buffer[2] = 0x00;
    p_nal->p_buffer[3] = 0x01;
576

577
    /* Copy nalu */
578
    memcpy( &p_nal->p_buffer[4], p, i_size );
579

580
    VLC_UNUSED(p_dec);
581 582 583
    return p_nal;
}

Laurent Aimar's avatar
Laurent Aimar committed
584
static void CreateDecodedNAL( uint8_t **pp_ret, int *pi_ret,
Laurent Aimar's avatar
Laurent Aimar committed
585
                              const uint8_t *src, int i_src )
586 587 588
{
    uint8_t *dst = malloc( i_src );

589 590
    *pp_ret = dst;

591
    if( dst )
592
        *pi_ret = nal_decode(src, dst, i_src);
593 594
}

595 596
/*****************************************************************************
 * ParseNALBlock: parses annexB type NALs
597
 * All p_frag blocks are required to start with 0 0 0 1 4-byte startcode
598
 *****************************************************************************/
599
static block_t *ParseNALBlock( decoder_t *p_dec, bool *pb_ts_used, block_t *p_frag )
600 601 602 603
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    block_t *p_pic = NULL;

604 605
    const int i_nal_ref_idc = (p_frag->p_buffer[4] >> 5)&0x03;
    const int i_nal_type = p_frag->p_buffer[4]&0x1f;
Laurent Aimar's avatar
Laurent Aimar committed
606 607
    const mtime_t i_frag_dts = p_frag->i_dts;
    const mtime_t i_frag_pts = p_frag->i_pts;
608

609
    if( p_sys->b_slice && ( !p_sys->b_sps || !p_sys->b_pps ) )
610
    {
611
        block_ChainRelease( p_sys->p_frame );
612
        msg_Warn( p_dec, "waiting for SPS/PPS" );
613

614
        /* Reset context */
615
        p_sys->slice.i_frame_type = 0;
616
        p_sys->p_frame = NULL;
617 618
        p_sys->b_frame_sps = false;
        p_sys->b_frame_pps = false;
619
        p_sys->b_slice = false;
620
        cc_Flush( &p_sys->cc_next );
621 622
    }

623
    if( ( !p_sys->b_sps || !p_sys->b_pps ) &&
624 625
        i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
    {
626
        p_sys->b_slice = true;
627 628 629
        /* Fragment will be discarded later on */
    }
    else if( i_nal_type >= NAL_SLICE && i_nal_type <= NAL_SLICE_IDR )
630
    {
631
        slice_t slice;
Laurent Aimar's avatar
Laurent Aimar committed
632
        bool  b_new_picture;
633

634
        ParseSlice( p_dec, &b_new_picture, &slice, i_nal_ref_idc, i_nal_type, p_frag );
635

636
        /* */
637 638
        if( b_new_picture && p_sys->b_slice )
            p_pic = OutputPicture( p_dec );
639 640 641

        /* */
        p_sys->slice = slice;
642 643 644 645 646
        p_sys->b_slice = true;
    }
    else if( i_nal_type == NAL_SPS )
    {
        if( p_sys->b_slice )
647
            p_pic = OutputPicture( p_dec );
648
        p_sys->b_frame_sps = true;
649

650
        PutSPS( p_dec, p_frag );
651

652
        /* Do not append the SPS because we will insert it on keyframes */
Laurent Aimar's avatar
Laurent Aimar committed
653
        p_frag = NULL;
654
    }
655
    else if( i_nal_type == NAL_PPS )
656
    {
657 658
        if( p_sys->b_slice )
            p_pic = OutputPicture( p_dec );
659
        p_sys->b_frame_pps = true;
660 661

        PutPPS( p_dec, p_frag );
662

663
        /* Do not append the PPS because we will insert it on keyframes */
Laurent Aimar's avatar
Laurent Aimar committed
664
        p_frag = NULL;
665 666 667 668 669
    }
    else if( i_nal_type == NAL_AU_DELIMITER ||
             i_nal_type == NAL_SEI ||
             ( i_nal_type >= 13 && i_nal_type <= 18 ) )
    {
670 671
        if( p_sys->b_slice )
            p_pic = OutputPicture( p_dec );
Laurent Aimar's avatar
Laurent Aimar committed
672

673
        /* Parse SEI for CC support */
674
        if( i_nal_type == NAL_SEI )
675
        {
676
            ParseSei( p_dec, p_frag );
677 678 679 680 681 682 683 684 685 686 687 688 689
        }
        else if( i_nal_type == NAL_AU_DELIMITER )
        {
            if( p_sys->p_frame && (p_sys->p_frame->i_flags & BLOCK_FLAG_PRIVATE_AUD) )
            {
                block_Release( p_frag );
                p_frag = NULL;
            }
            else
            {
                p_frag->i_flags |= BLOCK_FLAG_PRIVATE_AUD;
            }
        }
690 691
    }

692
    /* Append the block */
Laurent Aimar's avatar
Laurent Aimar committed
693 694
    if( p_frag )
        block_ChainAppend( &p_sys->p_frame, p_frag );
695

696
    *pb_ts_used = false;
697
    if( p_sys->i_frame_dts <= VLC_TS_INVALID &&
698
        p_sys->i_frame_pts <= VLC_TS_INVALID )
Laurent Aimar's avatar
Laurent Aimar committed
699 700 701
    {
        p_sys->i_frame_dts = i_frag_dts;
        p_sys->i_frame_pts = i_frag_pts;
702
        *pb_ts_used = true;
Laurent Aimar's avatar
Laurent Aimar committed
703
    }
704 705
    return p_pic;
}
706

707 708 709 710
static block_t *OutputPicture( decoder_t *p_dec )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    block_t *p_pic;
711

712 713 714 715 716 717 718 719 720 721 722 723
    if ( !p_sys->b_header && p_sys->i_recovery_frames != -1 )
    {
        if( p_sys->i_recovery_frames == 0 )
        {
            msg_Dbg( p_dec, "Recovery from SEI recovery point complete" );
            p_sys->b_header = true;
        }
        --p_sys->i_recovery_frames;
    }

    if( !p_sys->b_header && p_sys->i_recovery_frames == -1 &&
         p_sys->slice.i_frame_type != BLOCK_FLAG_TYPE_I)
724 725
        return NULL;

726 727 728 729
    const bool b_sps_pps_i = p_sys->slice.i_frame_type == BLOCK_FLAG_TYPE_I &&
                             p_sys->b_sps &&
                             p_sys->b_pps;
    if( b_sps_pps_i || p_sys->b_frame_sps || p_sys->b_frame_pps )
730
    {
731 732 733 734 735 736
        block_t *p_head = NULL;
        if( p_sys->p_frame->i_flags & BLOCK_FLAG_PRIVATE_AUD )
        {
            p_head = p_sys->p_frame;
            p_sys->p_frame = p_sys->p_frame->p_next;
        }
737

738
        block_t *p_list = NULL;
739
        for( int i = 0; i < SPS_MAX && (b_sps_pps_i || p_sys->b_frame_sps); i++ )
740 741 742 743
        {
            if( p_sys->pp_sps[i] )
                block_ChainAppend( &p_list, block_Duplicate( p_sys->pp_sps[i] ) );
        }
744
        for( int i = 0; i < PPS_MAX && (b_sps_pps_i || p_sys->b_frame_pps); i++ )
745 746 747 748
        {
            if( p_sys->pp_pps[i] )
                block_ChainAppend( &p_list, block_Duplicate( p_sys->pp_pps[i] ) );
        }
749
        if( b_sps_pps_i && p_list )
750
            p_sys->b_header = true;
Laurent Aimar's avatar
Laurent Aimar committed
751

752 753 754 755 756 757 758
        if( p_head )
            p_head->p_next = p_list;
        else
            p_head = p_list;
        block_ChainAppend( &p_head, p_sys->p_frame );

        p_pic = block_ChainGather( p_head );
759 760 761 762 763
    }
    else
    {
        p_pic = block_ChainGather( p_sys->p_frame );
    }
764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779

    unsigned i_num_clock_ts = 1;
    if( p_sys->b_frame_mbs_only == 0 && p_sys->b_pic_struct_present_flag )
    {
        if( p_sys->i_pic_struct < 9 )
        {
            const uint8_t rgi_numclock[9] = { 1, 1, 1, 2, 2, 3, 3, 2, 3 };
            i_num_clock_ts = rgi_numclock[ p_sys->i_pic_struct ];
        }
    }

    if( p_sys->i_time_scale )
    {
        p_pic->i_length = CLOCK_FREQ * i_num_clock_ts *
                          p_sys->i_num_units_in_tick / p_sys->i_time_scale;
    }
780

781 782 783 784 785
    if( p_sys->b_frame_mbs_only == 0 && p_sys->b_pic_struct_present_flag )
    {
        switch( p_sys->i_pic_struct )
        {
        case 1:
786 787 788 789 790 791 792 793 794 795 796 797
        case 2:
            if( !p_sys->b_even_frame )
            {
                p_pic->i_flags |= (p_sys->i_pic_struct == 1) ? BLOCK_FLAG_TOP_FIELD_FIRST
                                                             : BLOCK_FLAG_BOTTOM_FIELD_FIRST;
            }
            else if( p_pic->i_pts <= VLC_TS_INVALID && p_sys->i_prev_pts > VLC_TS_INVALID )
            {
                /* interpolate from even frame */
                p_pic->i_pts = p_sys->i_prev_pts + p_pic->i_length;
            }
            p_sys->b_even_frame = !p_sys->b_even_frame;
798 799 800
            break;
        case 3:
            p_pic->i_flags |= BLOCK_FLAG_TOP_FIELD_FIRST;
801
            p_sys->b_even_frame = false;
802 803
            break;
        case 4:
804 805 806 807 808 809
            p_pic->i_flags |= BLOCK_FLAG_BOTTOM_FIELD_FIRST;
            p_sys->b_even_frame = false;
            break;
        case 5:
            p_pic->i_flags |= BLOCK_FLAG_TOP_FIELD_FIRST;
            break;
810 811 812 813
        case 6:
            p_pic->i_flags |= BLOCK_FLAG_BOTTOM_FIELD_FIRST;
            break;
        default:
814
            p_sys->b_even_frame = false;
815 816 817 818
            break;
        }
    }

819 820 821 822 823 824 825 826 827 828 829 830 831 832
    if( p_sys->i_frame_dts <= VLC_TS_INVALID )
        p_sys->i_frame_dts = p_sys->i_prev_dts;

    p_pic->i_dts = p_sys->i_frame_dts;
    p_pic->i_pts = p_sys->i_frame_pts;
    p_pic->i_flags |= p_sys->slice.i_frame_type;
    p_pic->i_flags &= ~BLOCK_FLAG_PRIVATE_AUD;
    if( !p_sys->b_header )
        p_pic->i_flags |= BLOCK_FLAG_PREROLL;

    p_sys->i_prev_dts = p_sys->i_frame_dts;
    p_sys->i_prev_pts = p_sys->i_frame_pts;
    p_sys->i_frame_dts = VLC_TS_INVALID;
    p_sys->i_frame_pts = VLC_TS_INVALID;
833

834 835
    p_sys->slice.i_frame_type = 0;
    p_sys->p_frame = NULL;
836 837
    p_sys->b_frame_sps = false;
    p_sys->b_frame_pps = false;
838 839
    p_sys->b_slice = false;

840 841 842 843 844
    /* CC */
    p_sys->i_cc_pts = p_pic->i_pts;
    p_sys->i_cc_dts = p_pic->i_dts;
    p_sys->i_cc_flags = p_pic->i_flags;

845 846 847
    p_sys->cc = p_sys->cc_next;
    cc_Flush( &p_sys->cc_next );

848 849
    return p_pic;
}
850

851 852 853
static void PutSPS( decoder_t *p_dec, block_t *p_frag )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
854

855
    uint8_t *pb_dec = NULL;
856 857 858
    int     i_dec = 0;
    bs_t s;
    int i_tmp;
859
    int i_sps_id;
860

861
    CreateDecodedNAL( &pb_dec, &i_dec, &p_frag->p_buffer[5],
862 863
                     p_frag->i_buffer - 5 );

864
    bs_init( &s, pb_dec, i_dec );
865
    int i_profile_idc = bs_read( &s, 8 );
866 867 868 869
    p_dec->fmt_out.i_profile = i_profile_idc;
    /* Skip constraint_set0123, reserved(4) */
    bs_skip( &s, 1+1+1+1 + 4 );
    p_dec->fmt_out.i_level = bs_read( &s, 8 );
870
    /* sps id */
871
    i_sps_id = bs_read_ue( &s );
872
    if( i_sps_id >= SPS_MAX || i_sps_id < 0 )
873 874 875 876 877 878 879
    {
        msg_Warn( p_dec, "invalid SPS (sps_id=%d)", i_sps_id );
        free( pb_dec );
        block_Release( p_frag );
        return;
    }

880 881 882 883
    if( i_profile_idc == PROFILE_H264_HIGH || i_profile_idc == PROFILE_H264_HIGH_10 ||
        i_profile_idc == PROFILE_H264_HIGH_422 || i_profile_idc == PROFILE_H264_HIGH_444_PREDICTIVE ||
        i_profile_idc ==  PROFILE_H264_CAVLC_INTRA || i_profile_idc ==  PROFILE_H264_SVC_BASELINE ||
        i_profile_idc ==  PROFILE_H264_SVC_HIGH )
884 885
    {
        /* chroma_format_idc */
Laurent Aimar's avatar
Laurent Aimar committed
886 887
        const int i_chroma_format_idc = bs_read_ue( &s );
        if( i_chroma_format_idc == 3 )
Rémi Denis-Courmont's avatar
Rémi Denis-Courmont committed
888
            bs_skip( &s, 1 ); /* separate_colour_plane_flag */
889 890 891 892 893 894 895 896 897 898
        /* bit_depth_luma_minus8 */
        bs_read_ue( &s );
        /* bit_depth_chroma_minus8 */
        bs_read_ue( &s );
        /* qpprime_y_zero_transform_bypass_flag */
        bs_skip( &s, 1 );
        /* seq_scaling_matrix_present_flag */
        i_tmp = bs_read( &s, 1 );
        if( i_tmp )
        {
Laurent Aimar's avatar
Laurent Aimar committed
899 900
            for( int i = 0; i < ((3 != i_chroma_format_idc) ? 8 : 12); i++ )
            {
901 902 903 904
                /* seq_scaling_list_present_flag[i] */
                i_tmp = bs_read( &s, 1 );
                if( !i_tmp )
                    continue;
Laurent Aimar's avatar
Laurent Aimar committed
905
                const int i_size_of_scaling_list = (i < 6 ) ? 16 : 64;
906 907 908
                /* scaling_list (...) */
                int i_lastscale = 8;
                int i_nextscale = 8;
Laurent Aimar's avatar
Laurent Aimar committed
909 910 911 912
                for( int j = 0; j < i_size_of_scaling_list; j++ )
                {
                    if( i_nextscale != 0 )
                    {
913
                        /* delta_scale */
914
                        i_tmp = bs_read_se( &s );
915 916 917 918 919 920 921 922 923 924
                        i_nextscale = ( i_lastscale + i_tmp + 256 ) % 256;
                        /* useDefaultScalingMatrixFlag = ... */
                    }
                    /* scalinglist[j] */
                    i_lastscale = ( i_nextscale == 0 ) ? i_lastscale : i_nextscale;
                }
            }
        }
    }

925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950
    /* Skip i_log2_max_frame_num */
    p_sys->i_log2_max_frame_num = bs_read_ue( &s );
    if( p_sys->i_log2_max_frame_num > 12)
        p_sys->i_log2_max_frame_num = 12;
    /* Read poc_type */
    p_sys->i_pic_order_cnt_type = bs_read_ue( &s );
    if( p_sys->i_pic_order_cnt_type == 0 )
    {
        /* skip i_log2_max_poc_lsb */
        p_sys->i_log2_max_pic_order_cnt_lsb = bs_read_ue( &s );
        if( p_sys->i_log2_max_pic_order_cnt_lsb > 12 )
            p_sys->i_log2_max_pic_order_cnt_lsb = 12;
    }
    else if( p_sys->i_pic_order_cnt_type == 1 )
    {
        int i_cycle;
        /* skip b_delta_pic_order_always_zero */
        p_sys->i_delta_pic_order_always_zero_flag = bs_read( &s, 1 );
        /* skip i_offset_for_non_ref_pic */
        bs_read_se( &s );
        /* skip i_offset_for_top_to_bottom_field */
        bs_read_se( &s );
        /* read i_num_ref_frames_in_poc_cycle */
        i_cycle = bs_read_ue( &s );
        if( i_cycle > 256 ) i_cycle = 256;
        while( i_cycle > 0 )
951
        {
952 953
            /* skip i_offset_for_ref_frame */
            bs_read_se(&s );
Laurent Aimar's avatar
Laurent Aimar committed
954
            i_cycle--;
955
        }
956 957 958 959 960 961 962 963 964 965 966 967
    }
    /* i_num_ref_frames */
    bs_read_ue( &s );
    /* b_gaps_in_frame_num_value_allowed */
    bs_skip( &s, 1 );

    /* Read size */
    p_dec->fmt_out.video.i_width  = 16 * ( bs_read_ue( &s ) + 1 );
    p_dec->fmt_out.video.i_height = 16 * ( bs_read_ue( &s ) + 1 );

    /* b_frame_mbs_only */
    p_sys->b_frame_mbs_only = bs_read( &s, 1 );
968
    p_dec->fmt_out.video.i_height *=  ( 2 - p_sys->b_frame_mbs_only );
969 970
    if( p_sys->b_frame_mbs_only == 0 )
    {
971
        bs_skip( &s, 1 );
972 973 974
    }
    /* b_direct8x8_inference */
    bs_skip( &s, 1 );
975

976 977 978 979 980 981 982 983 984 985 986 987 988
    /* crop */
    i_tmp = bs_read( &s, 1 );
    if( i_tmp )
    {
        /* left */
        bs_read_ue( &s );
        /* right */
        bs_read_ue( &s );
        /* top */
        bs_read_ue( &s );
        /* bottom */
        bs_read_ue( &s );
    }
989

990 991 992 993
    /* vui */
    i_tmp = bs_read( &s, 1 );
    if( i_tmp )
    {
994
        /* read the aspect ratio part if any */
995 996 997
        i_tmp = bs_read( &s, 1 );
        if( i_tmp )
        {
998
            static const struct { int w, h; } sar[17] =
999
            {
1000 1001 1002
                { 0,   0 }, { 1,   1 }, { 12, 11 }, { 10, 11 },
                { 16, 11 }, { 40, 33 }, { 24, 11 }, { 20, 11 },
                { 32, 11 }, { 80, 33 }, { 18, 11 }, { 15, 11 },
1003 1004
                { 64, 33 }, { 160,99 }, {  4,  3 }, {  3,  2 },
                {  2,  1 },
1005 1006 1007 1008
            };
            int i_sar = bs_read( &s, 8 );
            int w, h;

1009
            if( i_sar < 17 )
1010 1011 1012 1013
            {
                w = sar[i_sar].w;
                h = sar[i_sar].h;
            }
1014
            else if( i_sar == 255 )
1015 1016 1017
            {
                w = bs_read( &s, 16 );
                h = bs_read( &s, 16 );
1018
            }
1019 1020 1021 1022 1023
            else
            {
                w = 0;
                h = 0;
            }
1024

1025 1026 1027 1028 1029
            if( w != 0 && h != 0 )
            {
                p_dec->fmt_out.video.i_sar_num = w;
                p_dec->fmt_out.video.i_sar_den = h;
            }
1030
            else
1031 1032 1033 1034
            {
                p_dec->fmt_out.video.i_sar_num = 1;
                p_dec->fmt_out.video.i_sar_den = 1;
            }
1035
        }
1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100

        /* overscan */
        i_tmp = bs_read( &s, 1 );
        if ( i_tmp )
            bs_read( &s, 1 );

        /* video signal type */
        i_tmp = bs_read( &s, 1 );
        if( i_tmp )
        {
            bs_read( &s, 4 );
            /* colour desc */
            bs_read( &s, 1 );
            if ( i_tmp )
                bs_read( &s, 24 );
        }

        /* chroma loc info */
        i_tmp = bs_read( &s, 1 );
        if( i_tmp )
        {
            bs_read_ue( &s );
            bs_read_ue( &s );
        }

        /* timing info */
        p_sys->b_timing_info_present_flag = bs_read( &s, 1 );
        if( p_sys->b_timing_info_present_flag )
        {
            p_sys->i_num_units_in_tick = bs_read( &s, 32 );
            p_sys->i_time_scale = bs_read( &s, 32 );
            p_sys->b_fixed_frame_rate = bs_read( &s, 1 );
        }

        /* Nal hrd & VC1 hrd parameters */
        p_sys->b_cpb_dpb_delays_present_flag = false;
        for ( int i=0; i<2; i++ )
        {
            i_tmp = bs_read( &s, 1 );
            if( i_tmp )
            {
                p_sys->b_cpb_dpb_delays_present_flag = true;
                uint32_t count = bs_read_ue( &s ) + 1;
                bs_read( &s, 4 );
                bs_read( &s, 4 );
                for( uint32_t i=0; i<count; i++ )
                {
                    bs_read_ue( &s );
                    bs_read_ue( &s );
                    bs_read( &s, 1 );
                }
                bs_read( &s, 5 );
                p_sys->i_cpb_removal_delay_length_minus1 = bs_read( &s, 5 );
                p_sys->i_dpb_output_delay_length_minus1 = bs_read( &s, 5 );
                bs_read( &s, 5 );
            }
        }

        if( p_sys->b_cpb_dpb_delays_present_flag )
            bs_read( &s, 1 );

        /* pic struct info */
        p_sys->b_pic_struct_present_flag = bs_read( &s, 1 );

        /* + unparsed remains */
1101
    }
1102

1103
    free( pb_dec );
1104

1105
    /* We have a new SPS */
1106 1107 1108 1109
    if( !p_sys->b_sps )
        msg_Dbg( p_dec, "found NAL_SPS (sps_id=%d)", i_sps_id );
    p_sys->b_sps = true;

1110 1111 1112
    if( p_sys->pp_sps[i_sps_id] )
        block_Release( p_sys->pp_sps[i_sps_id] );
    p_sys->pp_sps[i_sps_id] = p_frag;
1113
}
1114

1115 1116 1117 1118
static void PutPPS( decoder_t *p_dec, block_t *p_frag )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    bs_t s;
1119 1120
    int i_pps_id;
    int i_sps_id;
1121

1122
    bs_init( &s, &p_frag->p_buffer[5], p_frag->i_buffer - 5 );
1123 1124 1125 1126 1127 1128 1129 1130
    i_pps_id = bs_read_ue( &s ); // pps id
    i_sps_id = bs_read_ue( &s ); // sps id
    if( i_pps_id >= PPS_MAX || i_sps_id >= SPS_MAX )
    {
        msg_Warn( p_dec, "invalid PPS (pps_id=%d sps_id=%d)", i_pps_id, i_sps_id );
        block_Release( p_frag );
        return;
    }
1131 1132
    bs_skip( &s, 1 ); // entropy coding mode flag
    p_sys->i_pic_order_present_flag = bs_read( &s, 1 );
1133
    /* TODO */
1134

1135
    /* We have a new PPS */
1136
    if( !p_sys->b_pps )
1137
        msg_Dbg( p_dec, "found NAL_PPS (pps_id=%d sps_id=%d)", i_pps_id, i_sps_id );
1138
    p_sys->b_pps = true;
1139

1140 1141 1142
    if( p_sys->pp_pps[i_pps_id] )
        block_Release( p_sys->pp_pps[i_pps_id] );
    p_sys->pp_pps[i_pps_id] = p_frag;
1143 1144 1145 1146 1147 1148 1149 1150
}

static void ParseSlice( decoder_t *p_dec, bool *pb_new_picture, slice_t *p_slice,
                        int i_nal_ref_idc, int i_nal_type, const block_t *p_frag )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    uint8_t *pb_dec;
    int i_dec;
Rafaël Carré's avatar
Rafaël Carré committed
1151
    int i_slice_type;
1152 1153
    slice_t slice;
    bs_t s;
Laurent Aimar's avatar
Laurent Aimar committed
1154

1155
    /* do not convert the whole frame */
Laurent Aimar's avatar
Laurent Aimar committed
1156
    CreateDecodedNAL( &pb_dec, &i_dec, &p_frag->p_buffer[5],
1157 1158
                     __MIN( p_frag->i_buffer - 5, 60 ) );
    bs_init( &s, pb_dec, i_dec );
1159

1160
    /* first_mb_in_slice */
Rafaël Carré's avatar
Rafaël Carré committed
1161
    /* int i_first_mb = */ bs_read_ue( &s );
1162

1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
    /* slice_type */
    switch( (i_slice_type = bs_read_ue( &s )) )
    {
    case 0: case 5:
        slice.i_frame_type = BLOCK_FLAG_TYPE_P;
        break;
    case 1: case 6:
        slice.i_frame_type = BLOCK_FLAG_TYPE_B;
        break;
    case 2: case 7:
        slice.i_frame_type = BLOCK_FLAG_TYPE_I;
        break;
    case 3: case 8: /* SP */
        slice.i_frame_type = BLOCK_FLAG_TYPE_P;
        break;
    case 4: case 9:
        slice.i_frame_type = BLOCK_FLAG_TYPE_I;
        break;
    default:
        slice.i_frame_type = 0;
        break;
1184
    }
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195

    /* */
    slice.i_nal_type = i_nal_type;
    slice.i_nal_ref_idc = i_nal_ref_idc;

    slice.i_pic_parameter_set_id = bs_read_ue( &s );
    slice.i_frame_num = bs_read( &s, p_sys->i_log2_max_frame_num + 4 );

    slice.i_field_pic_flag = 0;
    slice.i_bottom_field_flag = -1;
    if( !p_sys->b_frame_mbs_only )
1196
    {