/src/vlc/modules/packetizer/mpeg4video.c

Source
/*****************************************************************************
 * mpeg4video.c: mpeg 4 video packetizer
 *****************************************************************************
 * Copyright (C) 2001-2006 VLC authors and VideoLAN
 *
 * Authors: Gildas Bazin <gbazin@videolan.org>
 *          Laurent Aimar <fenrir@via.ecp.fr>
 *          Eric Petit <titer@videolan.org>
 *
 * 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
 * (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
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * 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.
 *****************************************************************************/

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

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_sout.h>
#include <vlc_codec.h>
#include <vlc_block.h>

#include <vlc_bits.h>
#include <vlc_block_helper.h>
#include "packetizer_helper.h"
#include "startcode_helper.h"
#include "h26x_nal_common.h"

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

vlc_module_begin ()
    set_subcategory( SUBCAT_SOUT_PACKETIZER )
    set_description( N_("MPEG4 video packetizer") )
    set_capability( "video packetizer", 50 )
    set_callbacks( Open, Close )
vlc_module_end ()

/****************************************************************************
 * Local prototypes
 ****************************************************************************/
typedef struct
{
    /*
     * Input properties
     */
    packetizer_t packetizer;

    /*
     * Common properties
     */
    vlc_tick_t i_interpolated_pts;
    vlc_tick_t i_interpolated_dts;
    vlc_tick_t i_last_ref_pts;
    int64_t i_last_time_ref;
    int64_t i_time_ref;
    int64_t i_last_time;
    int64_t i_last_timeincr;

    unsigned int i_flags;

    int         i_fps_num;
    int         i_fps_den;

    bool  b_frame;

    /* Current frame being built */
    block_t    *p_frame;
    block_t    **pp_last;
} decoder_sys_t;

static block_t *Packetize( decoder_t *, block_t ** );
static void PacketizeFlush( decoder_t * );

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 * );

static block_t *ParseMPEGBlock( decoder_t *, block_t * );
static int ParseVOL( decoder_t *, es_format_t *, uint8_t *, int );
static int ParseVO( decoder_t *, block_t * );
static int ParseVOP( decoder_t *, block_t * );
static int vlc_log2( unsigned int );

#define VIDEO_OBJECT_MASK                       0x01f
#define VIDEO_OBJECT_LAYER_MASK                 0x00f

#define VIDEO_OBJECT_START_CODE                 0x100
#define VIDEO_OBJECT_LAYER_START_CODE           0x120
#define RESERVED_START_CODE                     0x130
#define VISUAL_OBJECT_SEQUENCE_START_CODE       0x1b0
#define VISUAL_OBJECT_SEQUENCE_END_CODE         0x1b1
#define USER_DATA_START_CODE                    0x1b2
#define GROUP_OF_VOP_START_CODE                 0x1b3
#define VIDEO_SESSION_ERROR_CODE                0x1b4
#define VISUAL_OBJECT_START_CODE                0x1b5
#define VOP_START_CODE                          0x1b6
#define FACE_OBJECT_START_CODE                  0x1ba
#define FACE_OBJECT_PLANE_START_CODE            0x1bb
#define MESH_OBJECT_START_CODE                  0x1bc
#define MESH_OBJECT_PLANE_START_CODE            0x1bd
#define STILL_TEXTURE_OBJECT_START_CODE         0x1be
#define TEXTURE_SPATIAL_LAYER_START_CODE        0x1bf
#define TEXTURE_SNR_LAYER_START_CODE            0x1c0

static const uint8_t p_mp4v_startcode[3] = { 0x00, 0x00, 0x01 };

/*****************************************************************************
 * Open: probe the packetizer and return score
 *****************************************************************************/
static int Open( vlc_object_t *p_this )
{
    decoder_t     *p_dec = (decoder_t*)p_this;
    decoder_sys_t *p_sys;

    if( p_dec->fmt_in->i_codec != VLC_CODEC_MP4V )
        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 )
        return VLC_ENOMEM;
    memset( p_sys, 0, sizeof(decoder_sys_t) );

    /* Misc init */
    packetizer_Init( &p_sys->packetizer,
                     p_mp4v_startcode, sizeof(p_mp4v_startcode), startcode_FindAnnexB,
                     NULL, 0, 4,
                     PacketizeReset, PacketizeParse, PacketizeValidate, NULL,
                     p_dec );

    p_sys->p_frame = NULL;
    p_sys->pp_last = &p_sys->p_frame;

    /* Setup properties */
    es_format_Copy( &p_dec->fmt_out, p_dec->fmt_in );
    p_dec->fmt_out.i_codec = VLC_CODEC_MP4V;

    if( p_dec->fmt_out.i_extra )
    {
        /* We have a vol */
        msg_Dbg( p_dec, "opening with vol size: %zu", p_dec->fmt_out.i_extra );
        ParseVOL( p_dec, &p_dec->fmt_out,
                  p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
    }

    /* Set callback */
    p_dec->pf_packetize = Packetize;
    p_dec->pf_flush = PacketizeFlush;
    p_dec->pf_get_cc = NULL;

    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;

    packetizer_Clean( &p_sys->packetizer );
    if( p_sys->p_frame )
        block_ChainRelease( p_sys->p_frame );
    free( p_sys );
}

/****************************************************************************
 * Packetize: the whole thing
 ****************************************************************************/
static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
{
    decoder_sys_t *p_sys = p_dec->p_sys;

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

static void PacketizeFlush( decoder_t *p_dec )
{
    decoder_sys_t *p_sys = p_dec->p_sys;

    packetizer_Flush( &p_sys->packetizer );
}

/*****************************************************************************
 * Helpers:
 *****************************************************************************/
static void PacketizeReset( void *p_private, bool b_flush )
{
    decoder_t *p_dec = p_private;
    decoder_sys_t *p_sys = p_dec->p_sys;

    if( b_flush )
    {
        if( p_sys->p_frame )
            block_ChainRelease( p_sys->p_frame );
        p_sys->p_frame = NULL;
        p_sys->pp_last = &p_sys->p_frame;
    }

    p_sys->i_interpolated_pts =
    p_sys->i_interpolated_dts =
    p_sys->i_last_ref_pts = VLC_TICK_INVALID;

    p_sys->i_last_time_ref =
    p_sys->i_time_ref =
    p_sys->i_last_time =
    p_sys->i_last_timeincr = 0;
}

static block_t *PacketizeParse( void *p_private, bool *pb_ts_used, block_t *p_block )
{
    decoder_t *p_dec = p_private;
    const vlc_tick_t i_dts = p_block->i_dts;
    const vlc_tick_t i_pts = p_block->i_pts;

    block_t *p_au = ParseMPEGBlock( p_dec, p_block );

    *pb_ts_used = p_au &&  p_au->i_dts == i_dts && p_au->i_pts == i_pts;

    return p_au;
}


static int PacketizeValidate( void *p_private, block_t *p_au )
{
    decoder_t *p_dec = p_private;
    decoder_sys_t *p_sys = p_dec->p_sys;

    /* We've just started the stream, wait for the first PTS.
     * We discard here so we can still get the sequence header. */
    if( p_sys->i_interpolated_pts == VLC_TICK_INVALID &&
        p_sys->i_interpolated_dts == VLC_TICK_INVALID )
    {
        msg_Dbg( p_dec, "need a starting pts/dts" );
        return VLC_EGENERIC;
    }

    /* When starting the stream we can have the first frame with
     * a null DTS (i_interpolated_pts is initialized to 0) */
    if( p_au->i_dts == VLC_TICK_INVALID )
        p_au->i_dts = p_au->i_pts;
    return VLC_SUCCESS;
}

/*****************************************************************************
 * ParseMPEGBlock: Re-assemble fragments into a block containing a picture
 *****************************************************************************/
static block_t *ParseMPEGBlock( decoder_t *p_dec, block_t *p_frag )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    block_t *p_pic = NULL;

    if( p_frag->i_buffer < 4 )
        return p_frag;

    const uint32_t i_startcode = GetDWBE( p_frag->p_buffer );
    if( i_startcode == VISUAL_OBJECT_SEQUENCE_START_CODE ||
        i_startcode == VISUAL_OBJECT_SEQUENCE_END_CODE ||
        i_startcode == USER_DATA_START_CODE )
    {   /* VOS and USERDATA */
#if 0
        /* Remove VOS start/end code from the original stream */
        block_Release( p_frag );
#else
        /* Append the block for now since ts/ps muxers rely on VOL
         * being present in the stream */
        block_ChainLastAppend( &p_sys->pp_last, p_frag );
#endif
        return NULL;
    }
    else if( i_startcode >= VIDEO_OBJECT_LAYER_START_CODE &&
             i_startcode < RESERVED_START_CODE )
    {
        /* Copy the complete VOL */
        if( (size_t)p_dec->fmt_out.i_extra != p_frag->i_buffer ||
           ( p_frag->i_buffer && memcmp(p_dec->fmt_out.p_extra,
                                        p_frag->p_buffer, p_frag->i_buffer) ) )
        {
            void *p_realloc = realloc( p_dec->fmt_out.p_extra, p_frag->i_buffer );
            if( p_realloc )
            {
                p_dec->fmt_out.p_extra = p_realloc;
                p_dec->fmt_out.i_extra = p_frag->i_buffer;
                memcpy( p_realloc, p_frag->p_buffer, p_frag->i_buffer );
            }
        }
        ParseVOL( p_dec, &p_dec->fmt_out,
                  p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );

#if 0
        /* Remove from the original stream */
        block_Release( p_frag );
#else
        /* Append the block for now since ts/ps muxers rely on VOL
         * being present in the stream */
        block_ChainLastAppend( &p_sys->pp_last, p_frag );
#endif
        return NULL;
    }
    else
    {
        if( !p_dec->fmt_out.i_extra )
        {
            msg_Warn( p_dec, "waiting for VOL" );
            block_Release( p_frag );
            return NULL;
        }

        /* Append the block */
        block_ChainLastAppend( &p_sys->pp_last, p_frag );
    }

    if( i_startcode == VISUAL_OBJECT_START_CODE )
    {
        ParseVO( p_dec, p_frag );
    }
    else
    if( i_startcode == VOP_START_CODE &&
        ParseVOP( p_dec, p_frag ) == VLC_SUCCESS )
    {
        /* We are dealing with a VOP */
        p_pic = block_ChainGather( p_sys->p_frame );
        p_pic->i_flags = p_sys->i_flags;
        p_pic->i_pts = p_sys->i_interpolated_pts;
        p_pic->i_dts = p_sys->i_interpolated_dts;

#if 0
    msg_Err( p_dec, "output dts/pts (%"PRId64",%"PRId64")", p_pic->i_dts, p_pic->i_pts );
#endif
        /* Reset context */
        p_sys->p_frame = NULL;
        p_sys->pp_last = &p_sys->p_frame;
    }

    return p_pic;
}

/* ParseVOL: */
static int ParseVOL( decoder_t *p_dec, es_format_t *fmt,
                     uint8_t *p_vol, int i_vol )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    int i_vo_ver_id, i_shape;
    h26x_aspect_ratio_t ar;
    bs_t s;

    for( ;; )
    {
        if( i_vol <= 5 )
            return VLC_EGENERIC;

        uint32_t i_startcode = GetDWBE( p_vol );
        if( i_startcode >= VIDEO_OBJECT_LAYER_START_CODE &&
            i_startcode < RESERVED_START_CODE )
            break;

        p_vol++; i_vol--;
    }

    bs_init( &s, &p_vol[4], i_vol - 4 );

    bs_skip( &s, 1 );   /* random access */
    bs_skip( &s, 8 );   /* vo_type */
    if( bs_read1( &s ) )
    {
        i_vo_ver_id = bs_read( &s, 4 );
        bs_skip( &s, 3 );
    }
    else
    {
        i_vo_ver_id = 1;
    }
    ar.aspect_ratio_idc = bs_read( &s, 4 ) & 0xf;
    if( ar.aspect_ratio_idc == 0xf )
    {
        ar.aspect_ratio_idc = 0xff; // was only coded on 4 bits in MPEG4
        ar.sar_width = bs_read( &s, 8 );
        ar.sar_height = bs_read( &s, 8 );
    }
    if(!p_dec->fmt_in->video.i_sar_num ||
       !p_dec->fmt_in->video.i_sar_den)
    {
        h26x_get_aspect_ratio(&ar,
                              &fmt->video.i_sar_num,
                              &fmt->video.i_sar_den);
    }

    if( bs_read1( &s ) )
    {
        /* vol control parameter */
        bs_skip( &s, 2 ); /* chroma_format */
        bs_skip( &s, 1 ); /* low_delay */

        if( bs_read1( &s ) )
        {
            bs_skip( &s, 16 );
            bs_skip( &s, 16 );
            bs_skip( &s, 16 );
            bs_skip( &s, 3 );
            bs_skip( &s, 11 );
            bs_skip( &s, 1 );
            bs_skip( &s, 16 );
        }
    }
    /* shape 0->RECT, 1->BIN, 2->BIN_ONLY, 3->GRAY */
    i_shape = bs_read( &s, 2 );
    if( i_shape == 3 && i_vo_ver_id != 1 )
    {
        bs_skip( &s, 4 );
    }

    if( !bs_read1( &s ) ) return VLC_EGENERIC; /* Marker */

    p_sys->i_fps_num = bs_read( &s, 16 ); /* Time increment resolution*/
    if( !p_sys->i_fps_num ) p_sys->i_fps_num = 1;

    if( !bs_read1( &s ) ) return VLC_EGENERIC; /* Marker */

    if( bs_read1( &s ) )
    {
        int i_time_increment_bits = vlc_log2( p_sys->i_fps_num - 1 ) + 1;

        if( i_time_increment_bits < 1 ) i_time_increment_bits = 1;

        p_sys->i_fps_den = bs_read( &s, i_time_increment_bits );
    }
    if( i_shape == 0 )
    {
        bs_skip( &s, 1 );
        fmt->video.i_width = bs_read( &s, 13 );
        bs_skip( &s, 1 );
        fmt->video.i_height= bs_read( &s, 13 );
        bs_skip( &s, 1 );
    }

    return VLC_SUCCESS;
}

static int ParseVO( decoder_t *p_dec, block_t *p_vo )
{
    bs_t s;
    bs_init( &s, &p_vo->p_buffer[4], p_vo->i_buffer - 4 );
    if( bs_read1( &s ) )
        bs_skip( &s, 7 );

    const uint8_t visual_object_type = bs_read( &s, 4 );
    if( visual_object_type == 1 /* video ID */ ||
        visual_object_type == 2 /* still texture ID */ )
    {
        h26x_colour_description_t colour =
        {
            .colour_primaries = 1,
            .transfer_characteristics = 1,
            .matrix_coeffs = 1,
            .full_range_flag = 0,
        };
        if( bs_read1( &s ) ) /* video_signal_type */
        {
            bs_skip( &s, 3 );
            colour.full_range_flag = bs_read( &s, 1 );
            if( bs_read( &s, 1 ) ) /* colour description */
            {
                colour.colour_primaries = bs_read( &s, 8 );
                colour.transfer_characteristics = bs_read( &s, 8 );
                colour.matrix_coeffs = bs_read( &s, 8 );
            }
        }

        if( p_dec->fmt_in->video.primaries == COLOR_PRIMARIES_UNDEF )
        {
            h26x_get_colorimetry( &colour,
                                  &p_dec->fmt_out.video.primaries,
                                  &p_dec->fmt_out.video.transfer,
                                  &p_dec->fmt_out.video.space,
                                  &p_dec->fmt_out.video.color_range );
        }
    }

    return VLC_SUCCESS;
}

static int ParseVOP( decoder_t *p_dec, block_t *p_vop )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    int64_t i_time_increment, i_time_ref;
    int i_modulo_time_base = 0, i_time_increment_bits;
    bs_t s;

    bs_init( &s, &p_vop->p_buffer[4], p_vop->i_buffer - 4 );

    switch( bs_read( &s, 2 ) )
    {
    case 0:
        p_sys->i_flags = BLOCK_FLAG_TYPE_I;
        break;
    case 1:
        p_sys->i_flags = BLOCK_FLAG_TYPE_P;
        break;
    case 2:
        p_sys->i_flags = BLOCK_FLAG_TYPE_B;
        p_sys->b_frame = true;
        break;
    case 3: /* gni ? */
        p_sys->i_flags = BLOCK_FLAG_TYPE_PB;
        break;
    }

    while( bs_read( &s, 1 ) ) i_modulo_time_base++;
    if( !bs_read1( &s ) ) return VLC_EGENERIC; /* Marker */

    /* VOP time increment */
    i_time_increment_bits = vlc_log2(p_sys->i_fps_num - 1) + 1;
    if( i_time_increment_bits < 1 ) i_time_increment_bits = 1;
    i_time_increment = bs_read( &s, i_time_increment_bits );

    /* Interpolate PTS/DTS */
    if( !(p_sys->i_flags & BLOCK_FLAG_TYPE_B) )
    {
        p_sys->i_last_time_ref = p_sys->i_time_ref;
        p_sys->i_time_ref +=
            (i_modulo_time_base * p_sys->i_fps_num);
        i_time_ref = p_sys->i_time_ref;
    }
    else
    {
        i_time_ref = p_sys->i_last_time_ref +
            (i_modulo_time_base * p_sys->i_fps_num);
    }

    int64_t i_time_diff = (i_time_ref + i_time_increment) - (p_sys->i_last_time + p_sys->i_last_timeincr);
    if( p_sys->i_fps_num && i_modulo_time_base == 0 && i_time_diff < 0 && -i_time_diff > p_sys->i_fps_num )
    {
        msg_Warn(p_dec, "missing modulo_time_base update");
        i_modulo_time_base += -i_time_diff / p_sys->i_fps_num;
        p_sys->i_time_ref += (i_modulo_time_base * p_sys->i_fps_num);
        p_sys->i_time_ref += p_sys->i_last_timeincr % p_sys->i_fps_num;
        i_time_ref = p_sys->i_time_ref;
    }

    if( p_sys->i_fps_num < 5 && /* Work-around buggy streams */
        p_dec->fmt_in->video.i_frame_rate > 0 &&
        p_dec->fmt_in->video.i_frame_rate_base > 0 )
    {
        p_sys->i_interpolated_pts += vlc_tick_from_samples(
        p_dec->fmt_in->video.i_frame_rate_base,
        p_dec->fmt_in->video.i_frame_rate);
    }
    else if( p_sys->i_fps_num )
    {
        i_time_diff = (i_time_ref + i_time_increment) - (p_sys->i_last_time + p_sys->i_last_timeincr);
        p_sys->i_interpolated_pts += vlc_tick_from_samples( i_time_diff, p_sys->i_fps_num );
    }

#if 0
    msg_Err( p_dec, "interp dts/pts (%"PRId64",%"PRId64"), dts/pts (%"PRId64",%"PRId64") %"PRId64" mod %d inc %"PRId64,
             p_sys->i_interpolated_dts, p_sys->i_interpolated_pts,
             p_vop->i_dts, p_vop->i_pts, p_sys->i_time_ref, i_modulo_time_base, i_time_increment );
#endif

    p_sys->i_last_time = i_time_ref;
    p_sys->i_last_timeincr = i_time_increment;

    /* Correct interpolated dts when we receive a new pts/dts */
    if( p_vop->i_pts != VLC_TICK_INVALID )
        p_sys->i_interpolated_pts = p_vop->i_pts;
    if( p_vop->i_dts != VLC_TICK_INVALID )
        p_sys->i_interpolated_dts = p_vop->i_dts;

    if( (p_sys->i_flags & BLOCK_FLAG_TYPE_B) || !p_sys->b_frame )
    {
        /* Trivial case (DTS == PTS) */

        p_sys->i_interpolated_dts = p_sys->i_interpolated_pts;

        if( p_vop->i_pts != VLC_TICK_INVALID )
            p_sys->i_interpolated_dts = p_vop->i_pts;
        if( p_vop->i_dts != VLC_TICK_INVALID )
            p_sys->i_interpolated_dts = p_vop->i_dts;

        p_sys->i_interpolated_pts = p_sys->i_interpolated_dts;
    }
    else
    {
        if( p_sys->i_last_ref_pts != VLC_TICK_INVALID )
            p_sys->i_interpolated_dts = p_sys->i_last_ref_pts;

        p_sys->i_last_ref_pts = p_sys->i_interpolated_pts;
    }

    return VLC_SUCCESS;
}

/* look at libavutil av_log2 ;) */
static int vlc_log2( unsigned int v )
{
    int n = 0;
    static const int vlc_log2_table[16] =
    {
        0,0,1,1,2,2,2,2, 3,3,3,3,3,3,3,3
    };

    if( v&0xffff0000 )
    {
        v >>= 16;
        n += 16;
    }
    if( v&0xff00 )
    {
        v >>= 8;
        n += 8;
    }
    if( v&0xf0 )
    {
        v >>= 4;
        n += 4;
    }
    n += vlc_log2_table[v];

    return n;
}

Coverage Report

Created: 2026-07-12 08:57

Line	Count	Source
1		/*****************************************************************************
2		* mpeg4video.c: mpeg 4 video packetizer
3		*****************************************************************************
4		* Copyright (C) 2001-2006 VLC authors and VideoLAN
5		*
6		* Authors: Gildas Bazin <gbazin@videolan.org>
7		* Laurent Aimar <fenrir@via.ecp.fr>
8		* Eric Petit <titer@videolan.org>
9		*
10		* This program is free software; you can redistribute it and/or modify it
11		* under the terms of the GNU Lesser General Public License as published by
12		* the Free Software Foundation; either version 2.1 of the License, or
13		* (at your option) any later version.
14		*
15		* This program is distributed in the hope that it will be useful,
16		* but WITHOUT ANY WARRANTY; without even the implied warranty of
17		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18		* GNU Lesser General Public License for more details.
19		*
20		* You should have received a copy of the GNU Lesser General Public License
21		* along with this program; if not, write to the Free Software Foundation,
22		* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23		*****************************************************************************/
24
25		/*****************************************************************************
26		* Preamble
27		*****************************************************************************/
28
29		#ifdef HAVE_CONFIG_H
30		# include "config.h"
31		#endif
32
33		#include <vlc_common.h>
34		#include <vlc_plugin.h>
35		#include <vlc_sout.h>
36		#include <vlc_codec.h>
37		#include <vlc_block.h>
38
39		#include <vlc_bits.h>
40		#include <vlc_block_helper.h>
41		#include "packetizer_helper.h"
42		#include "startcode_helper.h"
43		#include "h26x_nal_common.h"
44
45		/*****************************************************************************
46		* Module descriptor
47		*****************************************************************************/
48		static int Open ( vlc_object_t * );
49		static void Close( vlc_object_t * );
50
51	168	vlc_module_begin ()
52	84	set_subcategory( SUBCAT_SOUT_PACKETIZER )
53	84	set_description( N_("MPEG4 video packetizer") )
54	84	set_capability( "video packetizer", 50 )
55	168	set_callbacks( Open, Close )
56	84	vlc_module_end ()
57
58		/****************************************************************************
59		* Local prototypes
60		****************************************************************************/
61		typedef struct
62		{
63		/*
64		* Input properties
65		*/
66		packetizer_t packetizer;
67
68		/*
69		* Common properties
70		*/
71		vlc_tick_t i_interpolated_pts;
72		vlc_tick_t i_interpolated_dts;
73		vlc_tick_t i_last_ref_pts;
74		int64_t i_last_time_ref;
75		int64_t i_time_ref;
76		int64_t i_last_time;
77		int64_t i_last_timeincr;
78
79		unsigned int i_flags;
80
81		int i_fps_num;
82		int i_fps_den;
83
84		bool b_frame;
85
86		/* Current frame being built */
87		block_t *p_frame;
88		block_t **pp_last;
89		} decoder_sys_t;
90
91		static block_t Packetize( decoder_t , block_t ** );
92		static void PacketizeFlush( decoder_t * );
93
94		static void PacketizeReset( void *p_private, bool b_broken );
95		static block_t PacketizeParse( void p_private, bool pb_ts_used, block_t );
96		static int PacketizeValidate( void p_private, block_t );
97
98		static block_t ParseMPEGBlock( decoder_t , block_t * );
99		static int ParseVOL( decoder_t , es_format_t , uint8_t *, int );
100		static int ParseVO( decoder_t , block_t );
101		static int ParseVOP( decoder_t , block_t );
102		static int vlc_log2( unsigned int );
103
104		#define VIDEO_OBJECT_MASK 0x01f
105		#define VIDEO_OBJECT_LAYER_MASK 0x00f
106
107		#define VIDEO_OBJECT_START_CODE 0x100
108	1.12M	#define VIDEO_OBJECT_LAYER_START_CODE 0x120
109	416k	#define RESERVED_START_CODE 0x130
110	825k	#define VISUAL_OBJECT_SEQUENCE_START_CODE 0x1b0
111	825k	#define VISUAL_OBJECT_SEQUENCE_END_CODE 0x1b1
112	412k	#define USER_DATA_START_CODE 0x1b2
113		#define GROUP_OF_VOP_START_CODE 0x1b3
114		#define VIDEO_SESSION_ERROR_CODE 0x1b4
115	279k	#define VISUAL_OBJECT_START_CODE 0x1b5
116	542k	#define VOP_START_CODE 0x1b6
117		#define FACE_OBJECT_START_CODE 0x1ba
118		#define FACE_OBJECT_PLANE_START_CODE 0x1bb
119		#define MESH_OBJECT_START_CODE 0x1bc
120		#define MESH_OBJECT_PLANE_START_CODE 0x1bd
121		#define STILL_TEXTURE_OBJECT_START_CODE 0x1be
122		#define TEXTURE_SPATIAL_LAYER_START_CODE 0x1bf
123		#define TEXTURE_SNR_LAYER_START_CODE 0x1c0
124
125		static const uint8_t p_mp4v_startcode[3] = { 0x00, 0x00, 0x01 };
126
127		/*****************************************************************************
128		* Open: probe the packetizer and return score
129		*****************************************************************************/
130		static int Open( vlc_object_t *p_this )
131	68.3k	{
132	68.3k	decoder_t p_dec = (decoder_t)p_this;
133	68.3k	decoder_sys_t *p_sys;
134
135	68.3k	if( p_dec->fmt_in->i_codec != VLC_CODEC_MP4V )
136	61.1k	return VLC_EGENERIC;
137
138		/* Allocate the memory needed to store the decoder's structure */
139	7.24k	if( ( p_dec->p_sys = p_sys = malloc( sizeof(decoder_sys_t) ) ) == NULL )
140	0	return VLC_ENOMEM;
141	7.24k	memset( p_sys, 0, sizeof(decoder_sys_t) );
142
143		/* Misc init */
144	7.24k	packetizer_Init( &p_sys->packetizer,
145	7.24k	p_mp4v_startcode, sizeof(p_mp4v_startcode), startcode_FindAnnexB,
146	7.24k	NULL, 0, 4,
147	7.24k	PacketizeReset, PacketizeParse, PacketizeValidate, NULL,
148	7.24k	p_dec );
149
150	7.24k	p_sys->p_frame = NULL;
151	7.24k	p_sys->pp_last = &p_sys->p_frame;
152
153		/* Setup properties */
154	7.24k	es_format_Copy( &p_dec->fmt_out, p_dec->fmt_in );
155	7.24k	p_dec->fmt_out.i_codec = VLC_CODEC_MP4V;
156
157	7.24k	if( p_dec->fmt_out.i_extra )
158	1.94k	{
159		/* We have a vol */
160	1.94k	msg_Dbg( p_dec, "opening with vol size: %zu", p_dec->fmt_out.i_extra );
161	1.94k	ParseVOL( p_dec, &p_dec->fmt_out,
162	1.94k	p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
163	1.94k	}
164
165		/* Set callback */
166	7.24k	p_dec->pf_packetize = Packetize;
167	7.24k	p_dec->pf_flush = PacketizeFlush;
168	7.24k	p_dec->pf_get_cc = NULL;
169
170	7.24k	return VLC_SUCCESS;
171	7.24k	}
172
173		/*****************************************************************************
174		* Close: clean up the packetizer
175		*****************************************************************************/
176		static void Close( vlc_object_t *p_this )
177	7.24k	{
178	7.24k	decoder_t p_dec = (decoder_t)p_this;
179	7.24k	decoder_sys_t *p_sys = p_dec->p_sys;
180
181	7.24k	packetizer_Clean( &p_sys->packetizer );
182	7.24k	if( p_sys->p_frame )
183	1.71k	block_ChainRelease( p_sys->p_frame );
184	7.24k	free( p_sys );
185	7.24k	}
186
187		/****************************************************************************
188		* Packetize: the whole thing
189		****************************************************************************/
190		static block_t Packetize( decoder_t p_dec, block_t **pp_block )
191	102k	{
192	102k	decoder_sys_t *p_sys = p_dec->p_sys;
193
194	102k	return packetizer_Packetize( &p_sys->packetizer, pp_block );
195	102k	}
196
197		static void PacketizeFlush( decoder_t *p_dec )
198	0	{
199	0	decoder_sys_t *p_sys = p_dec->p_sys;
200
201	0	packetizer_Flush( &p_sys->packetizer );
202	0	}
203
204		/*****************************************************************************
205		* Helpers:
206		*****************************************************************************/
207		static void PacketizeReset( void *p_private, bool b_flush )
208	33.8k	{
209	33.8k	decoder_t *p_dec = p_private;
210	33.8k	decoder_sys_t *p_sys = p_dec->p_sys;
211
212	33.8k	if( b_flush )
213	0	{
214	0	if( p_sys->p_frame )
215	0	block_ChainRelease( p_sys->p_frame );
216	0	p_sys->p_frame = NULL;
217	0	p_sys->pp_last = &p_sys->p_frame;
218	0	}
219
220	33.8k	p_sys->i_interpolated_pts =
221	33.8k	p_sys->i_interpolated_dts =
222	33.8k	p_sys->i_last_ref_pts = VLC_TICK_INVALID;
223
224	33.8k	p_sys->i_last_time_ref =
225	33.8k	p_sys->i_time_ref =
226	33.8k	p_sys->i_last_time =
227	33.8k	p_sys->i_last_timeincr = 0;
228	33.8k	}
229
230		static block_t PacketizeParse( void p_private, bool pb_ts_used, block_t p_block )
231	412k	{
232	412k	decoder_t *p_dec = p_private;
233	412k	const vlc_tick_t i_dts = p_block->i_dts;
234	412k	const vlc_tick_t i_pts = p_block->i_pts;
235
236	412k	block_t *p_au = ParseMPEGBlock( p_dec, p_block );
237
238	412k	*pb_ts_used = p_au && p_au->i_dts == i_dts && p_au->i_pts == i_pts;
239
240	412k	return p_au;
241	412k	}
242
243
244		static int PacketizeValidate( void p_private, block_t p_au )
245	12.4k	{
246	12.4k	decoder_t *p_dec = p_private;
247	12.4k	decoder_sys_t *p_sys = p_dec->p_sys;
248
249		/* We've just started the stream, wait for the first PTS.
250		* We discard here so we can still get the sequence header. */
251	12.4k	if( p_sys->i_interpolated_pts == VLC_TICK_INVALID &&
252	830	p_sys->i_interpolated_dts == VLC_TICK_INVALID )
253	689	{
254	689	msg_Dbg( p_dec, "need a starting pts/dts" );
255	689	return VLC_EGENERIC;
256	689	}
257
258		/* When starting the stream we can have the first frame with
259		* a null DTS (i_interpolated_pts is initialized to 0) */
260	11.7k	if( p_au->i_dts == VLC_TICK_INVALID )
261	166	p_au->i_dts = p_au->i_pts;
262	11.7k	return VLC_SUCCESS;
263	12.4k	}
264
265		/*****************************************************************************
266		* ParseMPEGBlock: Re-assemble fragments into a block containing a picture
267		*****************************************************************************/
268		static block_t ParseMPEGBlock( decoder_t p_dec, block_t *p_frag )
269	412k	{
270	412k	decoder_sys_t *p_sys = p_dec->p_sys;
271	412k	block_t *p_pic = NULL;
272
273	412k	if( p_frag->i_buffer < 4 )
274	0	return p_frag;
275
276	412k	const uint32_t i_startcode = GetDWBE( p_frag->p_buffer );
277	412k	if( i_startcode == VISUAL_OBJECT_SEQUENCE_START_CODE \|\|
278	412k	i_startcode == VISUAL_OBJECT_SEQUENCE_END_CODE \|\|
279	412k	i_startcode == USER_DATA_START_CODE )
280	4.27k	{ /* VOS and USERDATA */
281		#if 0
282		/* Remove VOS start/end code from the original stream */
283		block_Release( p_frag );
284		#else
285		/* Append the block for now since ts/ps muxers rely on VOL
286		* being present in the stream */
287	4.27k	block_ChainLastAppend( &p_sys->pp_last, p_frag );
288	4.27k	#endif
289	4.27k	return NULL;
290	4.27k	}
291	408k	else if( i_startcode >= VIDEO_OBJECT_LAYER_START_CODE &&
292	267k	i_startcode < RESERVED_START_CODE )
293	105k	{
294		/* Copy the complete VOL */
295	105k	if( (size_t)p_dec->fmt_out.i_extra != p_frag->i_buffer \|\|
296	24.0k	( p_frag->i_buffer && memcmp(p_dec->fmt_out.p_extra,
297	24.0k	p_frag->p_buffer, p_frag->i_buffer) ) )
298	85.0k	{
299	85.0k	void *p_realloc = realloc( p_dec->fmt_out.p_extra, p_frag->i_buffer );
300	85.0k	if( p_realloc )
301	85.0k	{
302	85.0k	p_dec->fmt_out.p_extra = p_realloc;
303	85.0k	p_dec->fmt_out.i_extra = p_frag->i_buffer;
304	85.0k	memcpy( p_realloc, p_frag->p_buffer, p_frag->i_buffer );
305	85.0k	}
306	85.0k	}
307	105k	ParseVOL( p_dec, &p_dec->fmt_out,
308	105k	p_dec->fmt_out.p_extra, p_dec->fmt_out.i_extra );
309
310		#if 0
311		/* Remove from the original stream */
312		block_Release( p_frag );
313		#else
314		/* Append the block for now since ts/ps muxers rely on VOL
315		* being present in the stream */
316	105k	block_ChainLastAppend( &p_sys->pp_last, p_frag );
317	105k	#endif
318	105k	return NULL;
319	105k	}
320	303k	else
321	303k	{
322	303k	if( !p_dec->fmt_out.i_extra )
323	24.0k	{
324	24.0k	msg_Warn( p_dec, "waiting for VOL" );
325	24.0k	block_Release( p_frag );
326	24.0k	return NULL;
327	24.0k	}
328
329		/* Append the block */
330	279k	block_ChainLastAppend( &p_sys->pp_last, p_frag );
331	279k	}
332
333	279k	if( i_startcode == VISUAL_OBJECT_START_CODE )
334	7.83k	{
335	7.83k	ParseVO( p_dec, p_frag );
336	7.83k	}
337	271k	else
338	271k	if( i_startcode == VOP_START_CODE &&
339	15.0k	ParseVOP( p_dec, p_frag ) == VLC_SUCCESS )
340	12.4k	{
341		/* We are dealing with a VOP */
342	12.4k	p_pic = block_ChainGather( p_sys->p_frame );
343	12.4k	p_pic->i_flags = p_sys->i_flags;
344	12.4k	p_pic->i_pts = p_sys->i_interpolated_pts;
345	12.4k	p_pic->i_dts = p_sys->i_interpolated_dts;
346
347		#if 0
348		msg_Err( p_dec, "output dts/pts (%"PRId64",%"PRId64")", p_pic->i_dts, p_pic->i_pts );
349		#endif
350		/* Reset context */
351	12.4k	p_sys->p_frame = NULL;
352	12.4k	p_sys->pp_last = &p_sys->p_frame;
353	12.4k	}
354
355	279k	return p_pic;
356	412k	}
357
358		/* ParseVOL: */
359		static int ParseVOL( decoder_t p_dec, es_format_t fmt,
360		uint8_t *p_vol, int i_vol )
361	107k	{
362	107k	decoder_sys_t *p_sys = p_dec->p_sys;
363	107k	int i_vo_ver_id, i_shape;
364	107k	h26x_aspect_ratio_t ar;
365	107k	bs_t s;
366
367	107k	for( ;; )
368	156k	{
369	156k	if( i_vol <= 5 )
370	1.49k	return VLC_EGENERIC;
371
372	155k	uint32_t i_startcode = GetDWBE( p_vol );
373	155k	if( i_startcode >= VIDEO_OBJECT_LAYER_START_CODE &&
374	148k	i_startcode < RESERVED_START_CODE )
375	105k	break;
376
377	49.2k	p_vol++; i_vol--;
378	49.2k	}
379
380	105k	bs_init( &s, &p_vol[4], i_vol - 4 );
381
382	105k	bs_skip( &s, 1 ); /* random access */
383	105k	bs_skip( &s, 8 ); /* vo_type */
384	105k	if( bs_read1( &s ) )
385	72.2k	{
386	72.2k	i_vo_ver_id = bs_read( &s, 4 );
387	72.2k	bs_skip( &s, 3 );
388	72.2k	}
389	33.6k	else
390	33.6k	{
391	33.6k	i_vo_ver_id = 1;
392	33.6k	}
393	105k	ar.aspect_ratio_idc = bs_read( &s, 4 ) & 0xf;
394	105k	if( ar.aspect_ratio_idc == 0xf )
395	30.6k	{
396	30.6k	ar.aspect_ratio_idc = 0xff; // was only coded on 4 bits in MPEG4
397	30.6k	ar.sar_width = bs_read( &s, 8 );
398	30.6k	ar.sar_height = bs_read( &s, 8 );
399	30.6k	}
400	105k	if(!p_dec->fmt_in->video.i_sar_num \|\|
401	6.96k	!p_dec->fmt_in->video.i_sar_den)
402	99.7k	{
403	99.7k	h26x_get_aspect_ratio(&ar,
404	99.7k	&fmt->video.i_sar_num,
405	99.7k	&fmt->video.i_sar_den);
406	99.7k	}
407
408	105k	if( bs_read1( &s ) )
409	59.2k	{
410		/* vol control parameter */
411	59.2k	bs_skip( &s, 2 ); /* chroma_format */
412	59.2k	bs_skip( &s, 1 ); /* low_delay */
413
414	59.2k	if( bs_read1( &s ) )
415	30.7k	{
416	30.7k	bs_skip( &s, 16 );
417	30.7k	bs_skip( &s, 16 );
418	30.7k	bs_skip( &s, 16 );
419	30.7k	bs_skip( &s, 3 );
420	30.7k	bs_skip( &s, 11 );
421	30.7k	bs_skip( &s, 1 );
422	30.7k	bs_skip( &s, 16 );
423	30.7k	}
424	59.2k	}
425		/* shape 0->RECT, 1->BIN, 2->BIN_ONLY, 3->GRAY */
426	105k	i_shape = bs_read( &s, 2 );
427	105k	if( i_shape == 3 && i_vo_ver_id != 1 )
428	18.6k	{
429	18.6k	bs_skip( &s, 4 );
430	18.6k	}
431
432	105k	if( !bs_read1( &s ) ) return VLC_EGENERIC; /* Marker */
433
434	40.7k	p_sys->i_fps_num = bs_read( &s, 16 ); /* Time increment resolution*/
435	40.7k	if( !p_sys->i_fps_num ) p_sys->i_fps_num = 1;
436
437	40.7k	if( !bs_read1( &s ) ) return VLC_EGENERIC; /* Marker */
438
439	30.2k	if( bs_read1( &s ) )
440	28.8k	{
441	28.8k	int i_time_increment_bits = vlc_log2( p_sys->i_fps_num - 1 ) + 1;
442
443	28.8k	if( i_time_increment_bits < 1 ) i_time_increment_bits = 1;
444
445	28.8k	p_sys->i_fps_den = bs_read( &s, i_time_increment_bits );
446	28.8k	}
447	30.2k	if( i_shape == 0 )
448	8.67k	{
449	8.67k	bs_skip( &s, 1 );
450	8.67k	fmt->video.i_width = bs_read( &s, 13 );
451	8.67k	bs_skip( &s, 1 );
452	8.67k	fmt->video.i_height= bs_read( &s, 13 );
453	8.67k	bs_skip( &s, 1 );
454	8.67k	}
455
456	30.2k	return VLC_SUCCESS;
457	40.7k	}
458
459		static int ParseVO( decoder_t p_dec, block_t p_vo )
460	7.83k	{
461	7.83k	bs_t s;
462	7.83k	bs_init( &s, &p_vo->p_buffer[4], p_vo->i_buffer - 4 );
463	7.83k	if( bs_read1( &s ) )
464	2.05k	bs_skip( &s, 7 );
465
466	7.83k	const uint8_t visual_object_type = bs_read( &s, 4 );
467	7.83k	if( visual_object_type == 1 /* video ID */ \|\|
468	7.71k	visual_object_type == 2 /* still texture ID */ )
469	2.66k	{
470	2.66k	h26x_colour_description_t colour =
471	2.66k	{
472	2.66k	.colour_primaries = 1,
473	2.66k	.transfer_characteristics = 1,
474	2.66k	.matrix_coeffs = 1,
475	2.66k	.full_range_flag = 0,
476	2.66k	};
477	2.66k	if( bs_read1( &s ) ) /* video_signal_type */
478	1.78k	{
479	1.78k	bs_skip( &s, 3 );
480	1.78k	colour.full_range_flag = bs_read( &s, 1 );
481	1.78k	if( bs_read( &s, 1 ) ) /* colour description */
482	1.29k	{
483	1.29k	colour.colour_primaries = bs_read( &s, 8 );
484	1.29k	colour.transfer_characteristics = bs_read( &s, 8 );
485	1.29k	colour.matrix_coeffs = bs_read( &s, 8 );
486	1.29k	}
487	1.78k	}
488
489	2.66k	if( p_dec->fmt_in->video.primaries == COLOR_PRIMARIES_UNDEF )
490	2.66k	{
491	2.66k	h26x_get_colorimetry( &colour,
492	2.66k	&p_dec->fmt_out.video.primaries,
493	2.66k	&p_dec->fmt_out.video.transfer,
494	2.66k	&p_dec->fmt_out.video.space,
495	2.66k	&p_dec->fmt_out.video.color_range );
496	2.66k	}
497	2.66k	}
498
499	7.83k	return VLC_SUCCESS;
500	7.83k	}
501
502		static int ParseVOP( decoder_t p_dec, block_t p_vop )
503	15.0k	{
504	15.0k	decoder_sys_t *p_sys = p_dec->p_sys;
505	15.0k	int64_t i_time_increment, i_time_ref;
506	15.0k	int i_modulo_time_base = 0, i_time_increment_bits;
507	15.0k	bs_t s;
508
509	15.0k	bs_init( &s, &p_vop->p_buffer[4], p_vop->i_buffer - 4 );
510
511	15.0k	switch( bs_read( &s, 2 ) )
512	15.0k	{
513	6.00k	case 0:
514	6.00k	p_sys->i_flags = BLOCK_FLAG_TYPE_I;
515	6.00k	break;
516	1.79k	case 1:
517	1.79k	p_sys->i_flags = BLOCK_FLAG_TYPE_P;
518	1.79k	break;
519	3.36k	case 2:
520	3.36k	p_sys->i_flags = BLOCK_FLAG_TYPE_B;
521	3.36k	p_sys->b_frame = true;
522	3.36k	break;
523	3.84k	case 3: /* gni ? */
524	3.84k	p_sys->i_flags = BLOCK_FLAG_TYPE_PB;
525	3.84k	break;
526	15.0k	}
527
528	411k	while( bs_read( &s, 1 ) ) i_modulo_time_base++;
529	15.0k	if( !bs_read1( &s ) ) return VLC_EGENERIC; /* Marker */
530
531		/* VOP time increment */
532	12.4k	i_time_increment_bits = vlc_log2(p_sys->i_fps_num - 1) + 1;
533	12.4k	if( i_time_increment_bits < 1 ) i_time_increment_bits = 1;
534	12.4k	i_time_increment = bs_read( &s, i_time_increment_bits );
535
536		/* Interpolate PTS/DTS */
537	12.4k	if( !(p_sys->i_flags & BLOCK_FLAG_TYPE_B) )
538	9.80k	{
539	9.80k	p_sys->i_last_time_ref = p_sys->i_time_ref;
540	9.80k	p_sys->i_time_ref +=
541	9.80k	(i_modulo_time_base * p_sys->i_fps_num);
542	9.80k	i_time_ref = p_sys->i_time_ref;
543	9.80k	}
544	2.59k	else
545	2.59k	{
546	2.59k	i_time_ref = p_sys->i_last_time_ref +
547	2.59k	(i_modulo_time_base * p_sys->i_fps_num);
548	2.59k	}
549
550	12.4k	int64_t i_time_diff = (i_time_ref + i_time_increment) - (p_sys->i_last_time + p_sys->i_last_timeincr);
551	12.4k	if( p_sys->i_fps_num && i_modulo_time_base == 0 && i_time_diff < 0 && -i_time_diff > p_sys->i_fps_num )
552	1.44k	{
553	1.44k	msg_Warn(p_dec, "missing modulo_time_base update");
554	1.44k	i_modulo_time_base += -i_time_diff / p_sys->i_fps_num;
555	1.44k	p_sys->i_time_ref += (i_modulo_time_base * p_sys->i_fps_num);
556	1.44k	p_sys->i_time_ref += p_sys->i_last_timeincr % p_sys->i_fps_num;
557	1.44k	i_time_ref = p_sys->i_time_ref;
558	1.44k	}
559
560	12.4k	if( p_sys->i_fps_num < 5 && /* Work-around buggy streams */
561	2.46k	p_dec->fmt_in->video.i_frame_rate > 0 &&
562	25	p_dec->fmt_in->video.i_frame_rate_base > 0 )
563	25	{
564	25	p_sys->i_interpolated_pts += vlc_tick_from_samples(
565	25	p_dec->fmt_in->video.i_frame_rate_base,
566	25	p_dec->fmt_in->video.i_frame_rate);
567	25	}
568	12.3k	else if( p_sys->i_fps_num )
569	11.4k	{
570	11.4k	i_time_diff = (i_time_ref + i_time_increment) - (p_sys->i_last_time + p_sys->i_last_timeincr);
571	11.4k	p_sys->i_interpolated_pts += vlc_tick_from_samples( i_time_diff, p_sys->i_fps_num );
572	11.4k	}
573
574		#if 0
575		msg_Err( p_dec, "interp dts/pts (%"PRId64",%"PRId64"), dts/pts (%"PRId64",%"PRId64") %"PRId64" mod %d inc %"PRId64,
576		p_sys->i_interpolated_dts, p_sys->i_interpolated_pts,
577		p_vop->i_dts, p_vop->i_pts, p_sys->i_time_ref, i_modulo_time_base, i_time_increment );
578		#endif
579
580	12.4k	p_sys->i_last_time = i_time_ref;
581	12.4k	p_sys->i_last_timeincr = i_time_increment;
582
583		/* Correct interpolated dts when we receive a new pts/dts */
584	12.4k	if( p_vop->i_pts != VLC_TICK_INVALID )
585	323	p_sys->i_interpolated_pts = p_vop->i_pts;
586	12.4k	if( p_vop->i_dts != VLC_TICK_INVALID )
587	9.23k	p_sys->i_interpolated_dts = p_vop->i_dts;
588
589	12.4k	if( (p_sys->i_flags & BLOCK_FLAG_TYPE_B) \|\| !p_sys->b_frame )
590	5.48k	{
591		/* Trivial case (DTS == PTS) */
592
593	5.48k	p_sys->i_interpolated_dts = p_sys->i_interpolated_pts;
594
595	5.48k	if( p_vop->i_pts != VLC_TICK_INVALID )
596	319	p_sys->i_interpolated_dts = p_vop->i_pts;
597	5.48k	if( p_vop->i_dts != VLC_TICK_INVALID )
598	2.90k	p_sys->i_interpolated_dts = p_vop->i_dts;
599
600	5.48k	p_sys->i_interpolated_pts = p_sys->i_interpolated_dts;
601	5.48k	}
602	6.92k	else
603	6.92k	{
604	6.92k	if( p_sys->i_last_ref_pts != VLC_TICK_INVALID )
605	6.44k	p_sys->i_interpolated_dts = p_sys->i_last_ref_pts;
606
607	6.92k	p_sys->i_last_ref_pts = p_sys->i_interpolated_pts;
608	6.92k	}
609
610	12.4k	return VLC_SUCCESS;
611	15.0k	}
612
613		/* look at libavutil av_log2 ;) */
614		static int vlc_log2( unsigned int v )
615	41.2k	{
616	41.2k	int n = 0;
617	41.2k	static const int vlc_log2_table[16] =
618	41.2k	{
619	41.2k	0,0,1,1,2,2,2,2, 3,3,3,3,3,3,3,3
620	41.2k	};
621
622	41.2k	if( v&0xffff0000 )
623	983	{
624	983	v >>= 16;
625	983	n += 16;
626	983	}
627	41.2k	if( v&0xff00 )
628	37.4k	{
629	37.4k	v >>= 8;
630	37.4k	n += 8;
631	37.4k	}
632	41.2k	if( v&0xf0 )
633	36.8k	{
634	36.8k	v >>= 4;
635	36.8k	n += 4;
636	36.8k	}
637	41.2k	n += vlc_log2_table[v];
638
639	41.2k	return n;
640	41.2k	}