libmpeg2.c 29.1 KB
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/*****************************************************************************
 * libmpeg2.c: mpeg2 video decoder module making use of libmpeg2.
 *****************************************************************************
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 * Copyright (C) 1999-2001 the VideoLAN team
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 * $Id$
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 *
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 * Authors: Gildas Bazin <gbazin@videolan.org>
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 *          Christophe Massiot <massiot@via.ecp.fr>
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 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
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 *
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 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
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#include <assert.h>
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_codec.h>
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#include <vlc_block_helper.h>
#include "../codec/cc.h"
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#include <mpeg2.h>
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#include <vlc_codec_synchro.h>
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/*****************************************************************************
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 * decoder_sys_t : libmpeg2 decoder descriptor
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 *****************************************************************************/
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#define DPB_COUNT (3+1)
typedef struct
{
    picture_t *p_picture;
    bool      b_linked;
    bool      b_displayed;
} picture_dpb_t;

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struct decoder_sys_t
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{
    /*
     * libmpeg2 properties
     */
    mpeg2dec_t          *p_mpeg2dec;
    const mpeg2_info_t  *p_info;
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    bool                b_skip;
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    /*
     * Input properties
     */
    mtime_t          i_previous_pts;
    mtime_t          i_current_pts;
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    mtime_t          i_previous_dts;
    mtime_t          i_current_dts;
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    bool             b_garbage_pic;
    bool             b_after_sequence_header; /* is it the next frame after
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                                               * the sequence header ?    */
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    bool             b_slice_i;             /* intra-slice refresh stream */
    bool             b_second_field;
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    bool             b_preroll;
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    /* */
    picture_dpb_t        p_dpb[DPB_COUNT];

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    /*
     * Output properties
     */
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    decoder_synchro_t *p_synchro;
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    int             i_aspect;
    int             i_sar_num;
    int             i_sar_den;
    mtime_t         i_last_frame_pts;

    /* Closed captioning support */
    uint32_t        i_cc_flags;
    mtime_t         i_cc_pts;
    mtime_t         i_cc_dts;
    cc_data_t       cc;
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    uint8_t        *p_gop_user_data;
    uint32_t        i_gop_user_data;
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};
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/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
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static int  OpenDecoder( vlc_object_t * );
static void CloseDecoder( vlc_object_t * );

static picture_t *DecodeBlock( decoder_t *, block_t ** );
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#if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
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static block_t   *GetCc( decoder_t *p_dec, bool pb_present[4] );
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#endif
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static picture_t *GetNewPicture( decoder_t * );
static void PutPicture( decoder_t *, picture_t * );

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static void GetAR( decoder_t *p_dec );
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static void Reset( decoder_t *p_dec );

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/* */
static void DpbInit( decoder_t * );
static void DpbClean( decoder_t * );
static picture_t *DpbNewPicture( decoder_t * );
static void DpbUnlinkPicture( decoder_t *, picture_t * );
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static int DpbDisplayPicture( decoder_t *, picture_t * );
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/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
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vlc_module_begin ()
    set_description( N_("MPEG I/II video decoder (using libmpeg2)") )
    set_capability( "decoder", 150 )
    set_category( CAT_INPUT )
    set_subcategory( SUBCAT_INPUT_VCODEC )
    set_callbacks( OpenDecoder, CloseDecoder )
    add_shortcut( "libmpeg2" )
vlc_module_end ()
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/*****************************************************************************
 * OpenDecoder: probe the decoder and return score
 *****************************************************************************/
static int OpenDecoder( vlc_object_t *p_this )
{
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    decoder_t *p_dec = (decoder_t*)p_this;
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    decoder_sys_t *p_sys;
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    uint32_t i_accel = 0;
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    if( p_dec->fmt_in.i_codec != VLC_CODEC_MPGV )
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        return VLC_EGENERIC;
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    /* Select onl recognized original format (standard mpeg video) */
    switch( p_dec->fmt_in.i_original_fourcc )
    {
    case VLC_FOURCC('m','p','g','1'):
    case VLC_FOURCC('m','p','g','2'):
    case VLC_FOURCC('m','p','g','v'):
    case VLC_FOURCC('P','I','M','1'):
    case VLC_FOURCC('h','d','v','2'):
        break;
    default:
        if( p_dec->fmt_in.i_original_fourcc )
            return VLC_EGENERIC;
        break;
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    }

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    /* Allocate the memory needed to store the decoder's structure */
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    if( ( p_dec->p_sys = p_sys = calloc( 1, sizeof(*p_sys)) ) == NULL )
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        return VLC_ENOMEM;
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    /* Initialize the thread properties */
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    p_sys->p_mpeg2dec = NULL;
    p_sys->p_synchro  = NULL;
    p_sys->p_info     = NULL;
    p_sys->i_current_pts  = 0;
    p_sys->i_previous_pts = 0;
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    p_sys->i_current_dts  = 0;
    p_sys->i_previous_dts = 0;
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    p_sys->b_garbage_pic = false;
    p_sys->b_slice_i  = false;
    p_sys->b_second_field = false;
    p_sys->b_skip     = false;
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    p_sys->b_preroll = false;
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    DpbInit( p_dec );
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    p_sys->i_cc_pts = 0;
    p_sys->i_cc_dts = 0;
    p_sys->i_cc_flags = 0;
#if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
    p_dec->pf_get_cc = GetCc;
    cc_Init( &p_sys->cc );
#endif
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    p_sys->p_gop_user_data = NULL;
    p_sys->i_gop_user_data = 0;
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#if defined( __i386__ ) || defined( __x86_64__ )
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    if( vlc_CPU() & CPU_CAPABILITY_MMX )
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    {
        i_accel |= MPEG2_ACCEL_X86_MMX;
    }

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    if( vlc_CPU() & CPU_CAPABILITY_3DNOW )
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    {
        i_accel |= MPEG2_ACCEL_X86_3DNOW;
    }

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    if( vlc_CPU() & CPU_CAPABILITY_MMXEXT )
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    {
        i_accel |= MPEG2_ACCEL_X86_MMXEXT;
    }

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#elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
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    if( vlc_CPU() & CPU_CAPABILITY_ALTIVEC )
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    {
        i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
    }

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#elif defined(__arm__)
    i_accel | MPEG2_ACCEL_ARM;

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#else
    /* If we do not know this CPU, trust libmpeg2's feature detection */
    i_accel = MPEG2_ACCEL_DETECT;

#endif

    /* Set CPU acceleration features */
    mpeg2_accel( i_accel );

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    /* Initialize decoder */
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    p_sys->p_mpeg2dec = mpeg2_init();
    if( p_sys->p_mpeg2dec == NULL)
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    {
        msg_Err( p_dec, "mpeg2_init() failed" );
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        free( p_sys );
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        return VLC_EGENERIC;
    }
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    p_sys->p_info = mpeg2_info( p_sys->p_mpeg2dec );

    p_dec->pf_decode_video = DecodeBlock;
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    p_dec->fmt_out.i_cat = VIDEO_ES;
    p_dec->fmt_out.i_codec = 0;
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    return VLC_SUCCESS;
}
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/*****************************************************************************
 * RunDecoder: the libmpeg2 decoder
 *****************************************************************************/
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static picture_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
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{
    decoder_sys_t   *p_sys = p_dec->p_sys;
    mpeg2_state_t   state;
    picture_t       *p_pic;

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    block_t *p_block;

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    if( !pp_block || !*pp_block )
        return NULL;
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    p_block = *pp_block;
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    if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY | BLOCK_FLAG_CORRUPTED) )
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        Reset( p_dec );
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    while( 1 )
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    {
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        state = mpeg2_parse( p_sys->p_mpeg2dec );
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        switch( state )
        {
        case STATE_SEQUENCE:
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        {
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            /* */
            DpbClean( p_dec );
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            /* */
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            mpeg2_custom_fbuf( p_sys->p_mpeg2dec, 1 );
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            /* Set the first 2 reference frames */
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            GetAR( p_dec );
            for( int i = 0; i < 2; i++ )
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            {
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                picture_t *p_picture = DpbNewPicture( p_dec );
                if( !p_picture )
                {
                    /* Is it ok ? or do we need a reset ? */
                    block_Release( p_block );
                    return NULL;
                }
                PutPicture( p_dec, p_picture );
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            }
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            if( p_sys->p_synchro )
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                decoder_SynchroRelease( p_sys->p_synchro );
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            if( p_sys->p_info->sequence->frame_period <= 0 )
                p_sys->p_synchro = NULL;
            else
                p_sys->p_synchro =
                decoder_SynchroInit( p_dec, (uint32_t)(UINT64_C(1001000000) *
                                27 / p_sys->p_info->sequence->frame_period) );
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            p_sys->b_after_sequence_header = true;
            break;
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        }
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        case STATE_GOP:
            /* There can be userdata in a GOP. It needs to be remembered for the next picture. */
            if( p_sys->p_info->user_data_len > 2 )
            {
                free( p_sys->p_gop_user_data );
                p_sys->p_gop_user_data = calloc( p_sys->p_info->user_data_len, sizeof(uint8_t) );
                if( p_sys->p_gop_user_data )
                {
                    p_sys->i_gop_user_data = p_sys->p_info->user_data_len;
                    memcpy( p_sys->p_gop_user_data, p_sys->p_info->user_data, p_sys->p_info->user_data_len );
                }
            }
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            break;

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        case STATE_PICTURE:
        {
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            const mpeg2_info_t *p_info = p_sys->p_info;
            const mpeg2_picture_t *p_current = p_info->current_picture;

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            mtime_t i_pts, i_dts;
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            if( p_sys->b_after_sequence_header &&
                (p_current->flags &
                    PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
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            {
                /* Intra-slice refresh. Simulate a blank I picture. */
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                msg_Dbg( p_dec, "intra-slice refresh stream" );
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                decoder_SynchroNewPicture( p_sys->p_synchro,
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                                           I_CODING_TYPE, 2, 0, 0,
                                           p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
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                decoder_SynchroDecode( p_sys->p_synchro );
                decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
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                p_sys->b_slice_i = true;
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            }
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            p_sys->b_after_sequence_header = false;
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#ifdef PIC_FLAG_PTS
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            i_pts = p_current->flags & PIC_FLAG_PTS ?
                ( ( p_current->pts ==
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                    (uint32_t)p_sys->i_current_pts ) ?
                  p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
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            i_dts = 0;
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            /* Hack to handle demuxers which only have DTS timestamps */
            if( !i_pts && !p_block->i_pts && p_block->i_dts > 0 )
            {
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                if( p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
                    (p_current->flags &
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                      PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
                {
                    i_pts = p_block->i_dts;
                }
            }
            p_block->i_pts = p_block->i_dts = 0;
            /* End hack */

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#else /* New interface */

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            i_pts = p_current->flags & PIC_FLAG_TAGS ?
                ( ( p_current->tag == (uint32_t)p_sys->i_current_pts ) ?
                            p_sys->i_current_pts : p_sys->i_previous_pts ) : 0;
            i_dts = p_current->flags & PIC_FLAG_TAGS ?
                ( ( p_current->tag2 == (uint32_t)p_sys->i_current_dts ) ?
                            p_sys->i_current_dts : p_sys->i_previous_dts ) : 0;
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#endif

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            /* If nb_fields == 1, it is a field picture, and it will be
             * followed by another field picture for which we won't call
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             * decoder_SynchroNewPicture() because this would have other
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             * problems, so we take it into account here.
             * This kind of sucks, but I didn't think better. --Meuuh
             */
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            decoder_SynchroNewPicture( p_sys->p_synchro,
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                                       p_current->flags & PIC_MASK_CODING_TYPE,
                                       p_current->nb_fields == 1 ? 2 :
                                       p_current->nb_fields, i_pts, i_dts,
                                       p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
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            bool b_skip = false;
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            if( !p_dec->b_pace_control && !p_sys->b_preroll &&
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                !(p_sys->b_slice_i
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                   && ((p_current->flags
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                         & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P))
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                   && !decoder_SynchroChoose( p_sys->p_synchro,
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                              p_current->flags
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                                & PIC_MASK_CODING_TYPE,
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                              /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
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                              p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
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            {
                b_skip = true;
            }

            p_pic = NULL;
            if( !b_skip )
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            {
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                p_pic = DpbNewPicture( p_dec );
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                if( !p_pic )
                {
                    Reset( p_dec );
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                    p_pic = DpbNewPicture( p_dec );
                    if( !p_pic )
                    {
                        mpeg2_reset( p_sys->p_mpeg2dec, 1 );
                        block_Release( p_block );
                        return NULL;
                    }
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                }
            }
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            if( b_skip || !p_pic )
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            {
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                mpeg2_skip( p_sys->p_mpeg2dec, 1 );
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                p_sys->b_skip = true;
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                decoder_SynchroTrash( p_sys->p_synchro );
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                PutPicture( p_dec, NULL );
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                if( !b_skip )
                {
                    block_Release( p_block );
                    return NULL;
                }
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            }
            else
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            {
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                mpeg2_skip( p_sys->p_mpeg2dec, 0 );
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                p_sys->b_skip = false;
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                decoder_SynchroDecode( p_sys->p_synchro );
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                PutPicture( p_dec, p_pic );
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            }
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            if( p_info->user_data_len > 2 || p_sys->i_gop_user_data > 2 )
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            {
                p_sys->i_cc_pts = i_pts;
                p_sys->i_cc_dts = i_dts;
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                if( (p_current->flags
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                             & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_P )
                    p_sys->i_cc_flags = BLOCK_FLAG_TYPE_P;
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                else if( (p_current->flags
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                             & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B )
                    p_sys->i_cc_flags = BLOCK_FLAG_TYPE_B;
                else p_sys->i_cc_flags = BLOCK_FLAG_TYPE_I;

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                if( p_sys->i_gop_user_data > 2 )
                {
                    /* We now have picture info for any cached user_data out of the gop */
                    cc_Extract( &p_sys->cc, &p_sys->p_gop_user_data[0], p_sys->i_gop_user_data );
                    p_sys->i_gop_user_data = 0;
                }

                /* Extract the CC from the user_data of the picture */
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                if( p_info->user_data_len > 2 )
                    cc_Extract( &p_sys->cc, &p_info->user_data[0], p_info->user_data_len );
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            }
        }
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        break;
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        case STATE_BUFFER:
            if( !p_block->i_buffer )
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            {
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                block_Release( p_block );
                return NULL;
            }

            if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
                                      | BLOCK_FLAG_CORRUPTED)) &&
                p_sys->p_synchro &&
                p_sys->p_info->sequence &&
                p_sys->p_info->sequence->width != (unsigned)-1 )
            {
                decoder_SynchroReset( p_sys->p_synchro );
                if( p_sys->p_info->current_fbuf != NULL &&
                    p_sys->p_info->current_fbuf->id != NULL )
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                {
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                    p_sys->b_garbage_pic = true;
                }
                if( p_sys->b_slice_i )
                {
                    decoder_SynchroNewPicture( p_sys->p_synchro,
                                               I_CODING_TYPE, 2, 0, 0,
                                               p_sys->p_info->sequence->flags &
                                                            SEQ_FLAG_LOW_DELAY );
                    decoder_SynchroDecode( p_sys->p_synchro );
                    decoder_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
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                }
            }
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            if( p_block->i_flags & BLOCK_FLAG_PREROLL )
            {
                p_sys->b_preroll = true;
            }
            else if( p_sys->b_preroll )
            {
                p_sys->b_preroll = false;
                if( p_sys->p_synchro )
                    decoder_SynchroReset( p_sys->p_synchro );
            }

#ifdef PIC_FLAG_PTS
            if( p_block->i_pts )
            {
                mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );

#else /* New interface */
            if( p_block->i_pts || p_block->i_dts )
            {
                mpeg2_tag_picture( p_sys->p_mpeg2dec,
                                   (uint32_t)p_block->i_pts,
                                   (uint32_t)p_block->i_dts );
#endif
                p_sys->i_previous_pts = p_sys->i_current_pts;
                p_sys->i_current_pts = p_block->i_pts;
                p_sys->i_previous_dts = p_sys->i_current_dts;
                p_sys->i_current_dts = p_block->i_dts;
            }

            mpeg2_buffer( p_sys->p_mpeg2dec, p_block->p_buffer,
                          p_block->p_buffer + p_block->i_buffer );

            p_block->i_buffer = 0;
            break;

#if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)

        case STATE_SEQUENCE_MODIFIED:
            GetAR( p_dec );
            break;
#endif
        case STATE_PICTURE_2ND:
            p_sys->b_second_field = true;
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            break;

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        case STATE_INVALID_END:
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        case STATE_END:
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        case STATE_SLICE:
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            p_pic = NULL;
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            if( p_sys->p_info->display_fbuf &&
                p_sys->p_info->display_fbuf->id )
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            {
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                p_pic = p_sys->p_info->display_fbuf->id;
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                if( DpbDisplayPicture( p_dec, p_pic ) )
                    p_pic = NULL;
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                decoder_SynchroEnd( p_sys->p_synchro,
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                                    p_sys->p_info->display_picture->flags & PIC_MASK_CODING_TYPE,
                                    p_sys->b_garbage_pic );
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                if( p_pic )
                {
                    p_pic->date = decoder_SynchroDate( p_sys->p_synchro );
                    if( p_sys->b_garbage_pic )
                        p_pic->date = 0; /* ??? */
                    p_sys->b_garbage_pic = false;
                }
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            }

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            if( p_sys->p_info->discard_fbuf &&
                p_sys->p_info->discard_fbuf->id )
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            {
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                DpbUnlinkPicture( p_dec, p_sys->p_info->discard_fbuf->id );
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            }
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            /* For still frames */
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            if( state == STATE_END && p_pic )
                p_pic->b_force = true;
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            if( p_pic )
            {
                /* Avoid frames with identical timestamps.
                 * Especially needed for still frames in DVD menus. */
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                if( p_sys->i_last_frame_pts == p_pic->date )
                    p_pic->date++;
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                p_sys->i_last_frame_pts = p_pic->date;
                return p_pic;
            }
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            break;

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        case STATE_INVALID:
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        {
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            msg_Err( p_dec, "invalid picture encountered" );
            /* I don't think we have anything to do, but well without
             * docs ... */
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            break;
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        }
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        default:
            break;
        }
    }

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    /* Never reached */
    return NULL;
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}

/*****************************************************************************
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 * CloseDecoder: libmpeg2 decoder destruction
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 *****************************************************************************/
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static void CloseDecoder( vlc_object_t *p_this )
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{
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    decoder_t *p_dec = (decoder_t *)p_this;
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    decoder_sys_t *p_sys = p_dec->p_sys;

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    DpbClean( p_dec );

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    free( p_sys->p_gop_user_data );

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    if( p_sys->p_synchro ) decoder_SynchroRelease( p_sys->p_synchro );
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    if( p_sys->p_mpeg2dec ) mpeg2_close( p_sys->p_mpeg2dec );
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    free( p_sys );
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}
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/*****************************************************************************
 * Reset: reset the decoder state
 *****************************************************************************/
static void Reset( decoder_t *p_dec )
{
    decoder_sys_t *p_sys = p_dec->p_sys;

    cc_Flush( &p_sys->cc );
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    mpeg2_reset( p_sys->p_mpeg2dec, 0 );
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    DpbClean( p_dec );
}

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/*****************************************************************************
 * GetNewPicture: Get a new picture from the vout and set the buf struct
 *****************************************************************************/
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static picture_t *GetNewPicture( decoder_t *p_dec )
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{
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    decoder_sys_t *p_sys = p_dec->p_sys;
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    picture_t *p_pic;
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    p_dec->fmt_out.video.i_width = p_sys->p_info->sequence->width;
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    p_dec->fmt_out.video.i_visible_width =
        p_sys->p_info->sequence->picture_width;
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    p_dec->fmt_out.video.i_height = p_sys->p_info->sequence->height;
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    p_dec->fmt_out.video.i_visible_height =
        p_sys->p_info->sequence->picture_height;
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    p_dec->fmt_out.video.i_aspect = p_sys->i_aspect;
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    p_dec->fmt_out.video.i_sar_num = p_sys->i_sar_num;
    p_dec->fmt_out.video.i_sar_den = p_sys->i_sar_den;
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    if( p_sys->p_info->sequence->frame_period > 0 )
    {
        p_dec->fmt_out.video.i_frame_rate =
            (uint32_t)( (uint64_t)1001000000 * 27 /
                        p_sys->p_info->sequence->frame_period );
        p_dec->fmt_out.video.i_frame_rate_base = 1001;
    }

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    p_dec->fmt_out.i_codec =
        ( p_sys->p_info->sequence->chroma_height <
          p_sys->p_info->sequence->height ) ?
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        VLC_CODEC_I420 : VLC_CODEC_I422;
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    /* Get a new picture */
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    p_pic = decoder_NewPicture( p_dec );
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    if( p_pic == NULL )
        return NULL;
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    p_pic->b_progressive = p_sys->p_info->current_picture != NULL ?
        p_sys->p_info->current_picture->flags & PIC_FLAG_PROGRESSIVE_FRAME : 1;
    p_pic->b_top_field_first = p_sys->p_info->current_picture != NULL ?
        p_sys->p_info->current_picture->flags & PIC_FLAG_TOP_FIELD_FIRST : 1;
    p_pic->i_nb_fields = p_sys->p_info->current_picture != NULL ?
        p_sys->p_info->current_picture->nb_fields : 2;

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    return p_pic;
}
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#if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
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/*****************************************************************************
 * GetCc: Retrieves the Closed Captions for the CC decoder.
 *****************************************************************************/
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 = NULL;
    int i;

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

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

    p_cc = block_New( p_dec, p_sys->cc.i_data);
    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_I|BLOCK_FLAG_TYPE_P|BLOCK_FLAG_TYPE_B);
    }
    cc_Flush( &p_sys->cc );
    return p_cc;
}
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#endif
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/*****************************************************************************
 * GetAR: Get aspect ratio
 *****************************************************************************/
static void GetAR( decoder_t *p_dec )
{
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    decoder_sys_t *p_sys = p_dec->p_sys;
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    /* Check whether the input gave a particular aspect ratio */
    if( p_dec->fmt_in.video.i_aspect )
    {
        p_sys->i_aspect = p_dec->fmt_in.video.i_aspect;
    }
    else
    {
        /* Use the value provided in the MPEG sequence header */
        if( p_sys->p_info->sequence->pixel_height > 0 )
        {
            p_sys->i_aspect =
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                ((uint64_t)p_sys->p_info->sequence->picture_width) *
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                p_sys->p_info->sequence->pixel_width *
                VOUT_ASPECT_FACTOR /
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                p_sys->p_info->sequence->picture_height /
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                p_sys->p_info->sequence->pixel_height;
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            p_sys->i_sar_num = p_sys->p_info->sequence->pixel_width;
            p_sys->i_sar_den = p_sys->p_info->sequence->pixel_height;
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        }
        else
        {
            /* Invalid aspect, assume 4:3.
             * This shouldn't happen and if it does it is a bug
             * in libmpeg2 (likely triggered by an invalid stream) */
            p_sys->i_aspect = VOUT_ASPECT_FACTOR * 4 / 3;
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            p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 4;
            p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 3;
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        }
    }

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    if( p_sys->p_info->sequence->frame_period > 0 )
        msg_Dbg( p_dec,
                 "%dx%d (display %d,%d), aspect %d, sar %i:%i, %u.%03u fps",
                 p_sys->p_info->sequence->picture_width,
                 p_sys->p_info->sequence->picture_height,
                 p_sys->p_info->sequence->display_width,
                 p_sys->p_info->sequence->display_height,
                 p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
                 (uint32_t)((uint64_t)1001000000 * 27 /
                     p_sys->p_info->sequence->frame_period / 1001),
                 (uint32_t)((uint64_t)1001000000 * 27 /
                     p_sys->p_info->sequence->frame_period % 1001) );
    else
        msg_Dbg( p_dec, "bad frame period" );
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}
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/*****************************************************************************
 * PutPicture: Put a picture_t in mpeg2 context
 *****************************************************************************/
static void PutPicture( decoder_t *p_dec, picture_t *p_picture )
{
    decoder_sys_t *p_sys = p_dec->p_sys;

    /* */
    uint8_t *pp_buf[3];
    for( int j = 0; j < 3; j++ )
        pp_buf[j] = p_picture ? p_picture->p[j].p_pixels : NULL;
    mpeg2_set_buf( p_sys->p_mpeg2dec, pp_buf, p_picture );

    /* Completly broken API, why the hell does it suppose
     * the stride of the chroma planes ! */
    if( p_picture )
        mpeg2_stride( p_sys->p_mpeg2dec, p_picture->p[Y_PLANE].i_pitch );
}


/**
 * Initialize a virtual Decoded Picture Buffer to workaround
 * libmpeg2 deficient API
 */
static void DpbInit( decoder_t *p_dec )
{
    decoder_sys_t *p_sys = p_dec->p_sys;

    for( int i = 0; i < DPB_COUNT; i++ )
        p_sys->p_dpb[i].p_picture = NULL;
}
/**
 * Empty and reset the current DPB
 */
static void DpbClean( decoder_t *p_dec )
{
    decoder_sys_t *p_sys = p_dec->p_sys;

    for( int i = 0; i < DPB_COUNT; i++ )
    {
        picture_dpb_t *p = &p_sys->p_dpb[i];
        if( !p->p_picture )
            continue;
        if( p->b_linked )
            decoder_UnlinkPicture( p_dec, p->p_picture );
        if( !p->b_displayed )
            decoder_DeletePicture( p_dec, p->p_picture );

        p->p_picture = NULL;
    }
}
/**
 * Retreive a picture and reserve a place in the DPB
 */
static picture_t *DpbNewPicture( decoder_t *p_dec )
{
    decoder_sys_t *p_sys = p_dec->p_sys;

    picture_dpb_t *p;
    int i;

    for( i = 0; i < DPB_COUNT; i++ )
    {
        p = &p_sys->p_dpb[i];
        if( !p->p_picture )
            break;
    }
    if( i >= DPB_COUNT )
    {
        msg_Err( p_dec, "Leaking picture" );
        return NULL;
    }

    p->p_picture = GetNewPicture( p_dec );
    if( p->p_picture )
    {
        decoder_LinkPicture( p_dec, p->p_picture );
        p->b_linked = true;
        p->b_displayed = false;

        p->p_picture->date = 0;
    }
    return p->p_picture;
}
static picture_dpb_t *DpbFindPicture( decoder_t *p_dec, picture_t *p_picture )
{
    decoder_sys_t *p_sys = p_dec->p_sys;

    for( int i = 0; i < DPB_COUNT; i++ )
    {
        picture_dpb_t *p = &p_sys->p_dpb[i];
        if( p->p_picture == p_picture )
            return p;
    }
    return NULL;
}
/**
 * Unlink the provided picture and ensure that the decoder
 * does not own it anymore.
 */
static void DpbUnlinkPicture( decoder_t *p_dec, picture_t *p_picture )
{
    picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
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    /* XXX it is needed to workaround libmpeg2 bugs */
    if( !p || !p->b_linked )
    {
        msg_Err( p_dec, "DpbUnlinkPicture called on an invalid picture" );
        return;
    }

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    assert( p && p->b_linked );

    decoder_UnlinkPicture( p_dec, p->p_picture );
    p->b_linked = false;

    if( !p->b_displayed )
        decoder_DeletePicture( p_dec, p->p_picture );
    p->p_picture = NULL;
}
/**
 * Mark the provided picture as displayed.
 */
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static int DpbDisplayPicture( decoder_t *p_dec, picture_t *p_picture )
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{
    picture_dpb_t *p = DpbFindPicture( p_dec, p_picture );
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    /* XXX it is needed to workaround libmpeg2 bugs */
    if( !p || p->b_displayed || !p->b_linked )
    {
        msg_Err( p_dec, "DpbDisplayPicture called on an invalid picture" );
        return VLC_EGENERIC;
    }

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    assert( p && !p->b_displayed && p->b_linked );

    p->b_displayed = true;
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    return VLC_SUCCESS;
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}