libmpeg2.c 24.7 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
 *****************************************************************************/
#include <vlc/vlc.h>
#include <vlc/vout.h>
#include <vlc/decoder.h>

#include <mpeg2dec/mpeg2.h>

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#include "vout_synchro.h"

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/* Aspect ratio (ISO/IEC 13818-2 section 6.3.3, table 6-3) */
#define AR_SQUARE_PICTURE       1                           /* square pixels */
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#define AR_4_3_PICTURE          2                        /* 4:3 picture (TV) */
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#define AR_16_9_PICTURE         3              /* 16:9 picture (wide screen) */
#define AR_221_1_PICTURE        4                  /* 2.21:1 picture (movie) */

/*****************************************************************************
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 * decoder_sys_t : libmpeg2 decoder descriptor
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 *****************************************************************************/
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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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    vlc_bool_t          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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    int              i_current_rate;
    picture_t *      p_picture_to_destroy;
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    vlc_bool_t       b_garbage_pic;
    vlc_bool_t       b_after_sequence_header; /* is it the next frame after
                                               * the sequence header ?    */
    vlc_bool_t       b_slice_i;             /* intra-slice refresh stream */
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    vlc_bool_t      b_preroll;

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    /*
     * Output properties
     */
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    vout_synchro_t *p_synchro;
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    int            i_aspect;
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    int            i_sar_num;
    int            i_sar_den;
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    mtime_t        i_last_frame_pts;
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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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static picture_t *GetNewPicture( decoder_t *, uint8_t ** );
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static void GetAR( decoder_t *p_dec );
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/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
vlc_module_begin();
    set_description( _("MPEG I/II video decoder (using libmpeg2)") );
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    set_capability( "decoder", 150 );
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    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_VCODEC );
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    set_callbacks( OpenDecoder, CloseDecoder );
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    add_shortcut( "libmpeg2" );
vlc_module_end();

/*****************************************************************************
 * 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_FOURCC('m','p','g','v') &&
        p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','1') &&
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        /* Pinnacle hardware-mpeg1 */
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        p_dec->fmt_in.i_codec != VLC_FOURCC('P','I','M','1') &&
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        /* ATI Video */
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        p_dec->fmt_in.i_codec != VLC_FOURCC('V','C','R','2') &&
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        p_dec->fmt_in.i_codec != VLC_FOURCC('m','p','g','2') &&
        p_dec->fmt_in.i_codec != VLC_FOURCC('h','d','v','2') )
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    {
        return VLC_EGENERIC;
    }

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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 =
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          (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
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    {
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        msg_Err( p_dec, "out of memory" );
        return VLC_EGENERIC;
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    }

    /* Initialize the thread properties */
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    memset( p_sys, 0, sizeof(decoder_sys_t) );
    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->p_picture_to_destroy = NULL;
    p_sys->b_garbage_pic = 0;
    p_sys->b_slice_i  = 0;
    p_sys->b_skip     = 0;
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    p_sys->b_preroll = VLC_FALSE;
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#if defined( __i386__ ) || defined( __x86_64__ )
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    if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMX )
    {
        i_accel |= MPEG2_ACCEL_X86_MMX;
    }

    if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_3DNOW )
    {
        i_accel |= MPEG2_ACCEL_X86_3DNOW;
    }

    if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_MMXEXT )
    {
        i_accel |= MPEG2_ACCEL_X86_MMXEXT;
    }

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#elif defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc64__ )
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    if( p_dec->p_libvlc->i_cpu & CPU_CAPABILITY_ALTIVEC )
    {
        i_accel |= MPEG2_ACCEL_PPC_ALTIVEC;
    }

#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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    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;

    if( !pp_block || !*pp_block ) return NULL;

    p_block = *pp_block;
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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_BUFFER:
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            if( !p_block->i_buffer )
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            {
                block_Release( p_block );
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                return NULL;
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            }

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            if( (p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY
                                      | BLOCK_FLAG_CORRUPTED)) &&
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                p_sys->p_synchro &&
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                p_sys->p_info->sequence &&
                p_sys->p_info->sequence->width != (unsigned)-1 )
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            {
                vout_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 = 1;
                    p_pic = p_sys->p_info->current_fbuf->id;
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                }
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                else
                {
                    uint8_t *buf[3];
                    buf[0] = buf[1] = buf[2] = NULL;
                    if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
                        break;
                    mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
                }
                p_sys->p_picture_to_destroy = p_pic;

                if ( p_sys->b_slice_i )
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                {
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                    vout_SynchroNewPicture( p_sys->p_synchro,
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                        I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
                        p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
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                    vout_SynchroDecode( p_sys->p_synchro );
                    vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
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                }
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            }
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            if( p_block->i_flags & BLOCK_FLAG_PREROLL )
            {
                p_sys->b_preroll = VLC_TRUE;
            }
            else if( p_sys->b_preroll )
            {
                p_sys->b_preroll = VLC_FALSE;
                /* Reset synchro */
                vout_SynchroReset( p_sys->p_synchro );
            }

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#ifdef PIC_FLAG_PTS
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            if( p_block->i_pts )
            {
                mpeg2_pts( p_sys->p_mpeg2dec, (uint32_t)p_block->i_pts );
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#else /* New interface */
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            if( p_block->i_pts || p_block->i_dts )
            {
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                mpeg2_tag_picture( p_sys->p_mpeg2dec,
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                                   (uint32_t)p_block->i_pts,
                                   (uint32_t)p_block->i_dts );
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#endif
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                p_sys->i_previous_pts = p_sys->i_current_pts;
                p_sys->i_current_pts = p_block->i_pts;
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                p_sys->i_previous_dts = p_sys->i_current_dts;
                p_sys->i_current_dts = p_block->i_dts;
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            }

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

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            p_block->i_buffer = 0;
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            break;

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#ifdef STATE_SEQUENCE_MODIFIED
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        case STATE_SEQUENCE_MODIFIED:
            GetAR( p_dec );
            break;
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#endif
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        case STATE_SEQUENCE:
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        {
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            /* Initialize video output */
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            uint8_t *buf[3];
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            buf[0] = buf[1] = buf[2] = NULL;
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            GetAR( p_dec );
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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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            mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
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            if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
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            {
                block_Release( p_block );
                return NULL;
            }
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            mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
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            /* This picture will never go through display_picture. */
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            p_pic->date = 0;

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            /* For some reason, libmpeg2 will put this pic twice in
             * discard_picture. This can be considered a bug in libmpeg2. */
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            p_dec->pf_picture_link( p_dec, p_pic );
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            if( p_sys->p_synchro )
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            {
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                vout_SynchroRelease( p_sys->p_synchro );
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            }
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            p_sys->p_synchro = vout_SynchroInit( p_dec,
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                (uint32_t)((uint64_t)1001000000 * 27 /
                p_sys->p_info->sequence->frame_period) );
            p_sys->b_after_sequence_header = 1;
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        }
        break;
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        case STATE_PICTURE_2ND:
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            vout_SynchroNewPicture( p_sys->p_synchro,
                p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
                p_sys->p_info->current_picture->nb_fields,
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                0, 0, p_sys->i_current_rate,
                p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
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            if( p_sys->b_skip )
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            {
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                vout_SynchroTrash( p_sys->p_synchro );
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            }
            else
            {
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                vout_SynchroDecode( p_sys->p_synchro );
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            }
            break;

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        case STATE_PICTURE:
        {
            uint8_t *buf[3];
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            mtime_t i_pts, i_dts;
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            buf[0] = buf[1] = buf[2] = NULL;

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            if ( p_sys->b_after_sequence_header &&
                 ((p_sys->p_info->current_picture->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" );
                vout_SynchroNewPicture( p_sys->p_synchro,
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                    I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
                    p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
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                vout_SynchroDecode( p_sys->p_synchro );
                vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
                p_sys->b_slice_i = 1;
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            }
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            p_sys->b_after_sequence_header = 0;

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#ifdef PIC_FLAG_PTS
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            i_pts = p_sys->p_info->current_picture->flags & PIC_FLAG_PTS ?
                ( ( p_sys->p_info->current_picture->pts ==
                    (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 )
            {
                if( p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ||
                    (p_sys->p_info->current_picture->flags &
                      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 */

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

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            vout_SynchroNewPicture( p_sys->p_synchro,
                p_sys->p_info->current_picture->flags & PIC_MASK_CODING_TYPE,
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                p_sys->p_info->current_picture->nb_fields, i_pts, i_dts,
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                p_sys->i_current_rate,
                p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
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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_sys->p_info->current_picture->flags
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                         & PIC_MASK_CODING_TYPE) == P_CODING_TYPE))
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                   && !vout_SynchroChoose( p_sys->p_synchro,
                              p_sys->p_info->current_picture->flags
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                                & PIC_MASK_CODING_TYPE,
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                              /*p_sys->p_vout->render_time*/ 0 /*FIXME*/,
                              p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY ) )
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            {
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                mpeg2_skip( p_sys->p_mpeg2dec, 1 );
                p_sys->b_skip = 1;
                vout_SynchroTrash( p_sys->p_synchro );
                mpeg2_set_buf( p_sys->p_mpeg2dec, buf, NULL );
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            }
            else
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            {
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                mpeg2_skip( p_sys->p_mpeg2dec, 0 );
                p_sys->b_skip = 0;
                vout_SynchroDecode( p_sys->p_synchro );
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                if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
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                {
                    block_Release( p_block );
                    return NULL;
                }
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                mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
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            }
        }
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        break;
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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 = (picture_t *)p_sys->p_info->display_fbuf->id;
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                vout_SynchroEnd( p_sys->p_synchro,
                            p_sys->p_info->display_picture->flags
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                             & PIC_MASK_CODING_TYPE,
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                            p_sys->b_garbage_pic );
                p_sys->b_garbage_pic = 0;
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                if ( p_sys->p_picture_to_destroy != p_pic )
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                {
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                    p_pic->date = vout_SynchroDate( p_sys->p_synchro );
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                }
                else
                {
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                    p_sys->p_picture_to_destroy = NULL;
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                    p_pic->date = 0;
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                }
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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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                p_dec->pf_picture_unlink( p_dec,
                                          p_sys->p_info->discard_fbuf->id );
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            }
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            /* For still frames */
            if( state == STATE_END && p_pic ) p_pic->b_force = VLC_TRUE;

            if( p_pic )
            {
                /* Avoid frames with identical timestamps.
                 * Especially needed for still frames in DVD menus. */
                if( p_sys->i_last_frame_pts == p_pic->date ) p_pic->date++;
                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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        {
            uint8_t *buf[3];
            buf[0] = buf[1] = buf[2] = NULL;

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            msg_Warn( p_dec, "invalid picture encountered" );
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            if ( ( p_sys->p_info->current_picture == NULL ) ||
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               ( ( p_sys->p_info->current_picture->flags &
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                   PIC_MASK_CODING_TYPE) != B_CODING_TYPE ) )
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            {
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                if( p_sys->p_synchro ) vout_SynchroReset( p_sys->p_synchro );
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            }
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            mpeg2_skip( p_sys->p_mpeg2dec, 1 );
            p_sys->b_skip = 1;
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            if( p_sys->p_info->current_fbuf &&
                p_sys->p_info->current_fbuf->id )
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            {
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                p_sys->b_garbage_pic = 1;
                p_pic = p_sys->p_info->current_fbuf->id;
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            }
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            else if( !p_sys->p_info->sequence )
            {
                break;
            }
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            else
            {
                if( (p_pic = GetNewPicture( p_dec, buf )) == NULL )
                    break;
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                mpeg2_set_buf( p_sys->p_mpeg2dec, buf, p_pic );
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            }
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            p_sys->p_picture_to_destroy = p_pic;
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            memset( p_pic->p[0].p_pixels, 0,
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                    p_sys->p_info->sequence->width
                     * p_sys->p_info->sequence->height );
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            memset( p_pic->p[1].p_pixels, 0x80,
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                    p_sys->p_info->sequence->width
                     * p_sys->p_info->sequence->height / 4 );
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            memset( p_pic->p[2].p_pixels, 0x80,
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                    p_sys->p_info->sequence->width
                     * p_sys->p_info->sequence->height / 4 );
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            if( p_sys->b_slice_i )
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            {
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                vout_SynchroNewPicture( p_sys->p_synchro,
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                        I_CODING_TYPE, 2, 0, 0, p_sys->i_current_rate,
                        p_sys->p_info->sequence->flags & SEQ_FLAG_LOW_DELAY );
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                vout_SynchroDecode( p_sys->p_synchro );
                vout_SynchroEnd( p_sys->p_synchro, I_CODING_TYPE, 0 );
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            }
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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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    if( p_sys->p_synchro ) vout_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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/*****************************************************************************
 * 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, uint8_t **pp_buf )
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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 ) ?
        VLC_FOURCC('I','4','2','0') : VLC_FOURCC('I','4','2','2');
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    /* Get a new picture */
    p_pic = p_dec->pf_vout_buffer_new( 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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    p_dec->pf_picture_link( p_dec, p_pic );
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    pp_buf[0] = p_pic->p[0].p_pixels;
    pp_buf[1] = p_pic->p[1].p_pixels;
    pp_buf[2] = p_pic->p[2].p_pixels;

    return p_pic;
}
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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;
        if( p_sys->i_aspect <= AR_221_1_PICTURE )
        switch( p_sys->i_aspect )
        {
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        case AR_4_3_PICTURE:
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            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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            break;
        case AR_16_9_PICTURE:
            p_sys->i_aspect = VOUT_ASPECT_FACTOR * 16 / 9;
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            p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 16;
            p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 9;
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            break;
        case AR_221_1_PICTURE:
            p_sys->i_aspect = VOUT_ASPECT_FACTOR * 221 / 100;
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            p_sys->i_sar_num = p_sys->p_info->sequence->picture_height * 221;
            p_sys->i_sar_den = p_sys->p_info->sequence->picture_width * 100;
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            break;
        case AR_SQUARE_PICTURE:
            p_sys->i_aspect = VOUT_ASPECT_FACTOR *
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                           p_sys->p_info->sequence->picture_width /
                           p_sys->p_info->sequence->picture_height;
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            p_sys->i_sar_num = p_sys->i_sar_den = 1;
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            break;
        }
    }
    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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    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,
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             p_sys->p_info->sequence->display_width,
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             p_sys->p_info->sequence->display_height,
             p_sys->i_aspect, p_sys->i_sar_num, p_sys->i_sar_den,
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             (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) );
}