video.c 40.7 KB
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/*****************************************************************************
 * video.c: video decoder using the ffmpeg library
 *****************************************************************************
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 * Copyright (C) 1999-2001 the VideoLAN team
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 * $Id$
 *
 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
 *          Gildas Bazin <gbazin@videolan.org>
 *
 * 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.
 *
 * 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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#if defined(HAVE_LIBAVCODEC_AVCODEC_H) && defined(HAVE_AVCODEC_DXVA2)
# if _WIN32_WINNT < 0x600
/* dxva2 needs Vista support */
#  undef _WIN32_WINNT
#  define _WIN32_WINNT 0x600
# endif
#endif

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#include <vlc_common.h>
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#include <vlc_codec.h>
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#include <vlc_avcodec.h>
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#include <vlc_cpu.h>
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#include <assert.h>
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/* ffmpeg header */
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#ifdef HAVE_LIBAVCODEC_AVCODEC_H
#   include <libavcodec/avcodec.h>
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#   ifdef HAVE_AVCODEC_VAAPI
#       include <libavcodec/vaapi.h>
#   endif
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#   ifdef HAVE_AVCODEC_DXVA2
#       include <libavcodec/dxva2.h>
#   endif
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#   ifdef HAVE_AVCODEC_VDA
#       include <libavcodec/vda.h>
#   endif
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#elif defined(HAVE_FFMPEG_AVCODEC_H)
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#   include <ffmpeg/avcodec.h>
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#else
#   include <avcodec.h>
#endif

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#include "avcodec.h"
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#include "va.h"
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#if defined(HAVE_AVCODEC_VAAPI) || defined(HAVE_AVCODEC_DXVA2) || defined(HAVE_AVCODEC_VDA)
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#   define HAVE_AVCODEC_VA
#endif
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/*****************************************************************************
 * decoder_sys_t : decoder descriptor
 *****************************************************************************/
struct decoder_sys_t
{
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    AVCODEC_COMMON_MEMBERS
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    /* Video decoder specific part */
    mtime_t i_pts;

    AVFrame          *p_ff_pic;

    /* for frame skipping algo */
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    bool b_hurry_up;
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    enum AVDiscard i_skip_frame;
    enum AVDiscard i_skip_idct;
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    /* how many decoded frames are late */
    int     i_late_frames;
    mtime_t i_late_frames_start;

    /* for direct rendering */
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    bool b_direct_rendering;
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    int  i_direct_rendering_used;
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    bool b_has_b_frames;
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    /* Hack to force display of still pictures */
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    bool b_first_frame;
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    /* */
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#if LIBAVCODEC_VERSION_MAJOR < 54
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    AVPaletteControl palette;
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#else
# warning FIXME
#endif
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    /* */
    bool b_flush;
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    /* VA API */
    vlc_va_t *p_va;
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    vlc_sem_t sem_mt;
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};

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#ifdef HAVE_AVCODEC_MT
#   define wait_mt(s) vlc_sem_wait( &s->sem_mt )
#   define post_mt(s) vlc_sem_post( &s->sem_mt )
#else
#   define wait_mt(s)
#   define post_mt(s)
#endif

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/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
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static void ffmpeg_InitCodec      ( decoder_t * );
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static void ffmpeg_CopyPicture    ( decoder_t *, picture_t *, AVFrame * );
static int  ffmpeg_GetFrameBuf    ( struct AVCodecContext *, AVFrame * );
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static int  ffmpeg_ReGetFrameBuf( struct AVCodecContext *, AVFrame * );
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static void ffmpeg_ReleaseFrameBuf( struct AVCodecContext *, AVFrame * );

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#ifdef HAVE_AVCODEC_VA
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static enum PixelFormat ffmpeg_GetFormat( AVCodecContext *,
                                          const enum PixelFormat * );
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#endif
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static uint32_t ffmpeg_CodecTag( vlc_fourcc_t fcc )
{
    uint8_t *p = (uint8_t*)&fcc;
    return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
}

/*****************************************************************************
 * Local Functions
 *****************************************************************************/

/* Returns a new picture buffer */
static inline picture_t *ffmpeg_NewPictBuf( decoder_t *p_dec,
                                            AVCodecContext *p_context )
{
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    decoder_sys_t *p_sys = p_dec->p_sys;
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    p_dec->fmt_out.video.i_width = p_context->width;
    p_dec->fmt_out.video.i_height = p_context->height;
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    if( !p_context->width || !p_context->height )
    {
        return NULL; /* invalid display size */
    }

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    if( !p_sys->p_va && GetVlcChroma( &p_dec->fmt_out.video, p_context->pix_fmt ) )
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    {
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        /* we are doomed, but not really, because most codecs set their pix_fmt
         * much later
         * FIXME does it make sense here ? */
        p_dec->fmt_out.video.i_chroma = VLC_CODEC_I420;
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    }
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    p_dec->fmt_out.i_codec = p_dec->fmt_out.video.i_chroma;
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    /* If an aspect-ratio was specified in the input format then force it */
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    if( p_dec->fmt_in.video.i_sar_num > 0 && p_dec->fmt_in.video.i_sar_den > 0 )
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    {
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        p_dec->fmt_out.video.i_sar_num = p_dec->fmt_in.video.i_sar_num;
        p_dec->fmt_out.video.i_sar_den = p_dec->fmt_in.video.i_sar_den;
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    }
    else
    {
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        p_dec->fmt_out.video.i_sar_num = p_context->sample_aspect_ratio.num;
        p_dec->fmt_out.video.i_sar_den = p_context->sample_aspect_ratio.den;
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        if( !p_dec->fmt_out.video.i_sar_num || !p_dec->fmt_out.video.i_sar_den )
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        {
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            p_dec->fmt_out.video.i_sar_num = 1;
            p_dec->fmt_out.video.i_sar_den = 1;
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        }
    }

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    if( p_dec->fmt_in.video.i_frame_rate > 0 &&
        p_dec->fmt_in.video.i_frame_rate_base > 0 )
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    {
        p_dec->fmt_out.video.i_frame_rate =
            p_dec->fmt_in.video.i_frame_rate;
        p_dec->fmt_out.video.i_frame_rate_base =
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            p_dec->fmt_in.video.i_frame_rate_base;
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    }
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    else if( p_context->time_base.num > 0 && p_context->time_base.den > 0 )
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    {
        p_dec->fmt_out.video.i_frame_rate = p_context->time_base.den;
        p_dec->fmt_out.video.i_frame_rate_base = p_context->time_base.num;
    }
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    return decoder_NewPicture( p_dec );
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}

/*****************************************************************************
 * InitVideo: initialize the video decoder
 *****************************************************************************
 * the ffmpeg codec will be opened, some memory allocated. The vout is not yet
 * opened (done after the first decoded frame).
 *****************************************************************************/
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int InitVideoDec( decoder_t *p_dec, AVCodecContext *p_context,
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                      AVCodec *p_codec, int i_codec_id, const char *psz_namecodec )
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{
    decoder_sys_t *p_sys;
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    int i_val;
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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(decoder_sys_t) ) ) == NULL )
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        return VLC_ENOMEM;
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    p_codec->type = AVMEDIA_TYPE_VIDEO;
    p_context->codec_type = AVMEDIA_TYPE_VIDEO;
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    p_context->codec_id = i_codec_id;
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    p_sys->p_context = p_context;
    p_sys->p_codec = p_codec;
    p_sys->i_codec_id = i_codec_id;
    p_sys->psz_namecodec = psz_namecodec;
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    p_sys->p_ff_pic = avcodec_alloc_frame();
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    p_sys->b_delayed_open = true;
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    p_sys->p_va = NULL;
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    vlc_sem_init( &p_sys->sem_mt, 0 );
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    /* ***** Fill p_context with init values ***** */
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    p_sys->p_context->codec_tag = ffmpeg_CodecTag( p_dec->fmt_in.i_original_fourcc ?: p_dec->fmt_in.i_codec );
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    /*  ***** Get configuration of ffmpeg plugin ***** */
    p_sys->p_context->workaround_bugs =
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        var_InheritInteger( p_dec, "avcodec-workaround-bugs" );
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#if LIBAVCODEC_VERSION_MAJOR < 54
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    p_sys->p_context->error_recognition =
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#else
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    p_sys->p_context->err_recognition =
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#endif
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        var_InheritInteger( p_dec, "avcodec-error-resilience" );
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    if( var_CreateGetBool( p_dec, "grayscale" ) )
        p_sys->p_context->flags |= CODEC_FLAG_GRAY;
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    i_val = var_CreateGetInteger( p_dec, "avcodec-vismv" );
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    if( i_val ) p_sys->p_context->debug_mv = i_val;
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    i_val = var_CreateGetInteger( p_dec, "avcodec-lowres" );
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    if( i_val > 0 && i_val <= 2 ) p_sys->p_context->lowres = i_val;
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    i_val = var_CreateGetInteger( p_dec, "avcodec-skiploopfilter" );
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    if( i_val >= 4 ) p_sys->p_context->skip_loop_filter = AVDISCARD_ALL;
    else if( i_val == 3 ) p_sys->p_context->skip_loop_filter = AVDISCARD_NONKEY;
    else if( i_val == 2 ) p_sys->p_context->skip_loop_filter = AVDISCARD_BIDIR;
    else if( i_val == 1 ) p_sys->p_context->skip_loop_filter = AVDISCARD_NONREF;
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    if( var_CreateGetBool( p_dec, "avcodec-fast" ) )
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        p_sys->p_context->flags2 |= CODEC_FLAG2_FAST;
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    /* ***** ffmpeg frame skipping ***** */
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    p_sys->b_hurry_up = var_CreateGetBool( p_dec, "avcodec-hurry-up" );
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    switch( var_CreateGetInteger( p_dec, "avcodec-skip-frame" ) )
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    {
        case -1:
            p_sys->p_context->skip_frame = AVDISCARD_NONE;
            break;
        case 0:
            p_sys->p_context->skip_frame = AVDISCARD_DEFAULT;
            break;
        case 1:
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            p_sys->p_context->skip_frame = AVDISCARD_NONREF;
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            break;
        case 2:
            p_sys->p_context->skip_frame = AVDISCARD_NONKEY;
            break;
        case 3:
            p_sys->p_context->skip_frame = AVDISCARD_ALL;
            break;
        default:
            p_sys->p_context->skip_frame = AVDISCARD_NONE;
            break;
    }
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    p_sys->i_skip_frame = p_sys->p_context->skip_frame;
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    switch( var_CreateGetInteger( p_dec, "avcodec-skip-idct" ) )
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    {
        case -1:
            p_sys->p_context->skip_idct = AVDISCARD_NONE;
            break;
        case 0:
            p_sys->p_context->skip_idct = AVDISCARD_DEFAULT;
            break;
        case 1:
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            p_sys->p_context->skip_idct = AVDISCARD_NONREF;
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            break;
        case 2:
            p_sys->p_context->skip_idct = AVDISCARD_NONKEY;
            break;
        case 3:
            p_sys->p_context->skip_idct = AVDISCARD_ALL;
            break;
        default:
            p_sys->p_context->skip_idct = AVDISCARD_NONE;
            break;
    }
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    p_sys->i_skip_idct = p_sys->p_context->skip_idct;
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    /* ***** ffmpeg direct rendering ***** */
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    p_sys->b_direct_rendering = false;
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    p_sys->i_direct_rendering_used = -1;
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    if( var_CreateGetBool( p_dec, "avcodec-dr" ) &&
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       (p_sys->p_codec->capabilities & CODEC_CAP_DR1) &&
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        /* No idea why ... but this fixes flickering on some TSCC streams */
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        p_sys->i_codec_id != CODEC_ID_TSCC && p_sys->i_codec_id != CODEC_ID_CSCD &&
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        p_sys->i_codec_id != CODEC_ID_CINEPAK &&
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#if (LIBAVCODEC_VERSION_INT >= AV_VERSION_INT( 52, 68, 2 ) ) && (LIBAVCODEC_VERSION_INT < AV_VERSION_INT( 52, 100, 1 ) )
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        /* avcodec native vp8 decode doesn't handle EMU_EDGE flag, and I
           don't have idea howto implement fallback to libvpx decoder */
        p_sys->i_codec_id != CODEC_ID_VP8 &&
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#endif
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        !p_sys->p_context->debug_mv )
    {
        /* Some codecs set pix_fmt only after the 1st frame has been decoded,
         * so we need to do another check in ffmpeg_GetFrameBuf() */
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        p_sys->b_direct_rendering = true;
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    }

    /* ffmpeg doesn't properly release old pictures when frames are skipped */
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    //if( p_sys->b_hurry_up ) p_sys->b_direct_rendering = false;
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    if( p_sys->b_direct_rendering )
    {
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        msg_Dbg( p_dec, "trying to use direct rendering" );
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        p_sys->p_context->flags |= CODEC_FLAG_EMU_EDGE;
    }
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    else
    {
        msg_Dbg( p_dec, "direct rendering is disabled" );
    }
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    /* Always use our get_buffer wrapper so we can calculate the
     * PTS correctly */
    p_sys->p_context->get_buffer = ffmpeg_GetFrameBuf;
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    p_sys->p_context->reget_buffer = ffmpeg_ReGetFrameBuf;
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    p_sys->p_context->release_buffer = ffmpeg_ReleaseFrameBuf;
    p_sys->p_context->opaque = p_dec;

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#ifdef HAVE_AVCODEC_MT
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    int i_thread_count = var_InheritInteger( p_dec, "avcodec-threads" );
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    if( i_thread_count <= 0 )
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    {
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        i_thread_count = vlc_GetCPUCount();
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        if( i_thread_count > 1 )
            i_thread_count++;
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        //FIXME: take in count the decoding time
        i_thread_count = __MIN( i_thread_count, 4 );
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    }
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    i_thread_count = __MIN( i_thread_count, 16 );
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    msg_Dbg( p_dec, "allowing %d thread(s) for decoding", i_thread_count );
    p_sys->p_context->thread_count = i_thread_count;
#endif

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#ifdef HAVE_AVCODEC_VA
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    const bool b_use_hw = var_CreateGetBool( p_dec, "avcodec-hw" );
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    if( b_use_hw &&
        (i_codec_id == CODEC_ID_MPEG1VIDEO || i_codec_id == CODEC_ID_MPEG2VIDEO ||
         i_codec_id == CODEC_ID_MPEG4 ||
         i_codec_id == CODEC_ID_H264 ||
         i_codec_id == CODEC_ID_VC1 || i_codec_id == CODEC_ID_WMV3) )
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    {
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#ifdef HAVE_AVCODEC_MT
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        if( p_sys->p_context->thread_type & FF_THREAD_FRAME )
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        {
            msg_Warn( p_dec, "threaded frame decoding is not compatible with ffmpeg-hw, disabled" );
            p_sys->p_context->thread_type &= ~FF_THREAD_FRAME;
        }
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        if( ( p_sys->p_context->thread_type & FF_THREAD_SLICE ) &&
            ( i_codec_id == CODEC_ID_MPEG1VIDEO || i_codec_id == CODEC_ID_MPEG2VIDEO ) )
        {
            msg_Warn( p_dec, "threaded slice decoding is not compatible with ffmpeg-hw, disabled" );
            p_sys->p_context->thread_type &= ~FF_THREAD_SLICE;
        }
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#endif
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        p_sys->p_context->get_format = ffmpeg_GetFormat;
    }
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#endif
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#ifdef HAVE_AVCODEC_MT
    if( p_sys->p_context->thread_type & FF_THREAD_FRAME )
        p_dec->i_extra_picture_buffers = 2 * p_sys->p_context->thread_count;
#endif

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    /* ***** misc init ***** */
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    p_sys->i_pts = VLC_TS_INVALID;
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    p_sys->b_has_b_frames = false;
    p_sys->b_first_frame = true;
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    p_sys->b_flush = false;
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    p_sys->i_late_frames = 0;

    /* Set output properties */
    p_dec->fmt_out.i_cat = VIDEO_ES;
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    if( GetVlcChroma( &p_dec->fmt_out.video, p_context->pix_fmt ) != VLC_SUCCESS )
    {
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        /* we are doomed. but not really, because most codecs set their pix_fmt later on */
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        p_dec->fmt_out.i_codec = VLC_CODEC_I420;
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    }
    p_dec->fmt_out.i_codec = p_dec->fmt_out.video.i_chroma;
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#if LIBAVCODEC_VERSION_MAJOR < 54
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    /* Setup palette */
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    memset( &p_sys->palette, 0, sizeof(p_sys->palette) );
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    if( p_dec->fmt_in.video.p_palette )
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    {
        p_sys->palette.palette_changed = 1;

        for( int i = 0; i < __MIN( AVPALETTE_COUNT, p_dec->fmt_in.video.p_palette->i_entries ); i++ )
        {
            union {
                uint32_t u;
                uint8_t a[4];
            } c;
            c.a[0] = p_dec->fmt_in.video.p_palette->palette[i][0];
            c.a[1] = p_dec->fmt_in.video.p_palette->palette[i][1];
            c.a[2] = p_dec->fmt_in.video.p_palette->palette[i][2];
            c.a[3] = p_dec->fmt_in.video.p_palette->palette[i][3];

            p_sys->palette.palette[i] = c.u;
        }
        p_sys->p_context->palctrl = &p_sys->palette;

        p_dec->fmt_out.video.p_palette = malloc( sizeof(video_palette_t) );
        if( p_dec->fmt_out.video.p_palette )
            *p_dec->fmt_out.video.p_palette = *p_dec->fmt_in.video.p_palette;
    }
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    else if( p_sys->i_codec_id != CODEC_ID_MSVIDEO1 && p_sys->i_codec_id != CODEC_ID_CINEPAK )
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    {
        p_sys->p_context->palctrl = &p_sys->palette;
    }
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#else
# warning FIXME
#endif
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    /* ***** init this codec with special data ***** */
    ffmpeg_InitCodec( p_dec );

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    /* ***** Open the codec ***** */
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    if( ffmpeg_OpenCodec( p_dec ) < 0 )
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    {
        msg_Err( p_dec, "cannot open codec (%s)", p_sys->psz_namecodec );
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        av_free( p_sys->p_ff_pic );
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        vlc_sem_destroy( &p_sys->sem_mt );
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        free( p_sys );
        return VLC_EGENERIC;
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * DecodeVideo: Called to decode one or more frames
 *****************************************************************************/
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picture_t *DecodeVideo( decoder_t *p_dec, block_t **pp_block )
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{
    decoder_sys_t *p_sys = p_dec->p_sys;
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    AVCodecContext *p_context = p_sys->p_context;
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    int b_drawpicture;
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    int b_null_size = false;
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    block_t *p_block;

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    if( !pp_block || !*pp_block )
        return NULL;
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    if( !p_context->extradata_size && p_dec->fmt_in.i_extra )
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    {
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        ffmpeg_InitCodec( p_dec );
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        if( p_sys->b_delayed_open )
        {
            if( ffmpeg_OpenCodec( p_dec ) )
                msg_Err( p_dec, "cannot open codec (%s)", p_sys->psz_namecodec );
        }
    }
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    p_block = *pp_block;
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    if( p_sys->b_delayed_open )
    {
        block_Release( p_block );
        return NULL;
    }
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    if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
    {
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        p_sys->i_pts = VLC_TS_INVALID; /* To make sure we recover properly */
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        p_sys->i_late_frames = 0;

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        if( p_block->i_flags & BLOCK_FLAG_DISCONTINUITY )
            avcodec_flush_buffers( p_context );
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        block_Release( p_block );
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        return NULL;
    }

    if( p_block->i_flags & BLOCK_FLAG_PREROLL )
    {
        /* Do not care about late frames when prerolling
         * TODO avoid decoding of non reference frame
         * (ie all B except for H264 where it depends only on nal_ref_idc) */
        p_sys->i_late_frames = 0;
    }

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    if( !p_dec->b_pace_control && (p_sys->i_late_frames > 0) &&
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        (mdate() - p_sys->i_late_frames_start > INT64_C(5000000)) )
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    {
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        if( p_sys->i_pts > VLC_TS_INVALID )
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        {
            msg_Err( p_dec, "more than 5 seconds of late video -> "
                     "dropping frame (computer too slow ?)" );
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            p_sys->i_pts = VLC_TS_INVALID; /* To make sure we recover properly */
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        }
        block_Release( p_block );
        p_sys->i_late_frames--;
        return NULL;
    }

    /* A good idea could be to decode all I pictures and see for the other */
    if( !p_dec->b_pace_control &&
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        p_sys->b_hurry_up &&
        (p_sys->i_late_frames > 4) )
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    {
        b_drawpicture = 0;
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        if( p_sys->i_late_frames < 12 )
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        {
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            p_context->skip_frame =
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                    (p_sys->i_skip_frame <= AVDISCARD_NONREF) ?
                    AVDISCARD_NONREF : p_sys->i_skip_frame;
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        }
        else
        {
            /* picture too late, won't decode
             * but break picture until a new I, and for mpeg4 ...*/
            p_sys->i_late_frames--; /* needed else it will never be decrease */
            block_Release( p_block );
            return NULL;
        }
    }
    else
    {
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        if( p_sys->b_hurry_up )
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            p_context->skip_frame = p_sys->i_skip_frame;
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        if( !(p_block->i_flags & BLOCK_FLAG_PREROLL) )
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            b_drawpicture = 1;
        else
            b_drawpicture = 0;
    }

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    if( p_context->width <= 0 || p_context->height <= 0 )
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    {
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        if( p_sys->b_hurry_up )
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            p_context->skip_frame = p_sys->i_skip_frame;
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        b_null_size = true;
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    }
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    else if( !b_drawpicture )
    {
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        /* It creates broken picture
         * FIXME either our parser or ffmpeg is broken */
#if 0
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        if( p_sys->b_hurry_up )
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            p_context->skip_frame = __MAX( p_context->skip_frame,
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                                                  AVDISCARD_NONREF );
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#endif
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    }
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    /*
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     * Do the actual decoding now */
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    /* Don't forget that ffmpeg requires a little more bytes
     * that the real frame size */
    if( p_block->i_buffer > 0 )
    {
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        p_sys->b_flush = ( p_block->i_flags & BLOCK_FLAG_END_OF_SEQUENCE ) != 0;

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        p_block = block_Realloc( p_block, 0,
                            p_block->i_buffer + FF_INPUT_BUFFER_PADDING_SIZE );
        if( !p_block )
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            return NULL;
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        p_block->i_buffer -= FF_INPUT_BUFFER_PADDING_SIZE;
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        *pp_block = p_block;
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        memset( p_block->p_buffer + p_block->i_buffer, 0,
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                FF_INPUT_BUFFER_PADDING_SIZE );
    }

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    while( p_block->i_buffer > 0 || p_sys->b_flush )
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    {
        int i_used, b_gotpicture;
        picture_t *p_pic;
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        AVPacket pkt;
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        /* Set the PTS/DTS in the context reordered_opaque field */
        if( p_block->i_pts > VLC_TS_INVALID  )
            p_context->reordered_opaque = (p_block->i_pts << 1) | 0;
        else if( p_block->i_dts > VLC_TS_INVALID )
            p_context->reordered_opaque = (p_block->i_dts << 1) | 1;
        else
            p_context->reordered_opaque = INT64_MIN;
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        p_sys->p_ff_pic->reordered_opaque = p_context->reordered_opaque;
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        /* Make sure we don't reuse the same timestamps twice */
        p_block->i_pts =
        p_block->i_dts = VLC_TS_INVALID;

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        post_mt( p_sys );
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        av_init_packet( &pkt );
        pkt.data = p_block->p_buffer;
        pkt.size = p_block->i_buffer;
        i_used = avcodec_decode_video2( p_context, p_sys->p_ff_pic,
                                       &b_gotpicture, &pkt );
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        if( b_null_size && !p_sys->b_flush &&
            p_context->width > 0 && p_context->height > 0 )
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        {
            /* Reparse it to not drop the I frame */
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            b_null_size = false;
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            if( p_sys->b_hurry_up )
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                p_context->skip_frame = p_sys->i_skip_frame;
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            i_used = avcodec_decode_video2( p_context, p_sys->p_ff_pic,
                                           &b_gotpicture, &pkt );
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        }
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        wait_mt( p_sys );
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        if( p_sys->b_flush )
            p_sys->b_first_frame = true;

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        if( p_block->i_buffer <= 0 )
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            p_sys->b_flush = false;

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        if( i_used < 0 )
        {
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            if( b_drawpicture )
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                msg_Warn( p_dec, "cannot decode one frame (%zu bytes)",
                          p_block->i_buffer );
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            block_Release( p_block );
            return NULL;
        }
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        else if( i_used > p_block->i_buffer ||
                 p_context->thread_count > 1 )
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        {
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            i_used = p_block->i_buffer;
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        }

        /* Consumed bytes */
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        p_block->i_buffer -= i_used;
        p_block->p_buffer += i_used;
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        /* Nothing to display */
        if( !b_gotpicture )
        {
            if( i_used == 0 ) break;
            continue;
        }

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        /* Sanity check (seems to be needed for some streams) */
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        if( p_sys->p_ff_pic->pict_type == AV_PICTURE_TYPE_B)
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        {
            p_sys->b_has_b_frames = true;
        }

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        /* Compute the PTS */
        mtime_t i_pts = VLC_TS_INVALID;
        if( p_sys->p_ff_pic->reordered_opaque != INT64_MIN )
        {
            mtime_t i_ts = p_sys->p_ff_pic->reordered_opaque >> 1;
            bool    b_dts = p_sys->p_ff_pic->reordered_opaque & 1;
            if( b_dts )
            {
                if( !p_context->has_b_frames ||
                    !p_sys->b_has_b_frames ||
                    !p_sys->p_ff_pic->reference ||
                    p_sys->i_pts <= VLC_TS_INVALID )
                    i_pts = i_ts;
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                /* Guess what ? The rules are different for Real Video :( */
                if( (p_dec->fmt_in.i_codec == VLC_CODEC_RV30 ||
                     p_dec->fmt_in.i_codec == VLC_CODEC_RV40) &&
                    p_sys->b_has_b_frames )
                {
                    i_pts = VLC_TS_INVALID;
                    if(p_sys->p_ff_pic->reference) i_pts = i_ts;
                }
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            }
            else
            {
                i_pts = i_ts;
            }
        }
        if( i_pts <= VLC_TS_INVALID )
            i_pts = p_sys->i_pts;

        /* Interpolate the next PTS */
        if( i_pts > VLC_TS_INVALID )
            p_sys->i_pts = i_pts;
        if( p_sys->i_pts > VLC_TS_INVALID )
        {
            /* interpolate the next PTS */
            if( p_dec->fmt_in.video.i_frame_rate > 0 &&
                p_dec->fmt_in.video.i_frame_rate_base > 0 )
            {
                p_sys->i_pts += INT64_C(1000000) *
                    (2 + p_sys->p_ff_pic->repeat_pict) *
                    p_dec->fmt_in.video.i_frame_rate_base /
                    (2 * p_dec->fmt_in.video.i_frame_rate);
            }
            else if( p_context->time_base.den > 0 )
            {
                int i_tick = p_context->ticks_per_frame;
                if( i_tick <= 0 )
                    i_tick = 1;

                p_sys->i_pts += INT64_C(1000000) *
                    (2 + p_sys->p_ff_pic->repeat_pict) *
                    i_tick * p_context->time_base.num /
                    (2 * p_context->time_base.den);
            }
        }
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        /* Update frame late count (except when doing preroll) */
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        mtime_t i_display_date = 0;
        if( !(p_block->i_flags & BLOCK_FLAG_PREROLL) )
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            i_display_date = decoder_GetDisplayDate( p_dec, i_pts );
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        if( i_display_date > 0 && i_display_date <= mdate() )
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        {
            p_sys->i_late_frames++;
            if( p_sys->i_late_frames == 1 )
                p_sys->i_late_frames_start = mdate();
        }
        else
        {
            p_sys->i_late_frames = 0;
        }

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        if( !b_drawpicture || ( !p_sys->p_va && !p_sys->p_ff_pic->linesize[0] ) )
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            continue;

        if( !p_sys->p_ff_pic->opaque )
        {
            /* Get a new picture */
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            p_pic = ffmpeg_NewPictBuf( p_dec, p_context );
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            if( !p_pic )
            {
                block_Release( p_block );
                return NULL;
            }

            /* Fill p_picture_t from AVVideoFrame and do chroma conversion
             * if needed */
            ffmpeg_CopyPicture( p_dec, p_pic, p_sys->p_ff_pic );
        }
        else
        {
            p_pic = (picture_t *)p_sys->p_ff_pic->opaque;
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            decoder_LinkPicture( p_dec, p_pic );
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        }

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        if( !p_dec->fmt_in.video.i_sar_num || !p_dec->fmt_in.video.i_sar_den )
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        {
            /* Fetch again the aspect ratio in case it changed */
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            p_dec->fmt_out.video.i_sar_num
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                = p_context->sample_aspect_ratio.num;
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            p_dec->fmt_out.video.i_sar_den
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                = p_context->sample_aspect_ratio.den;
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            if( !p_dec->fmt_out.video.i_sar_num || !p_dec->fmt_out.video.i_sar_den )
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            {
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                p_dec->fmt_out.video.i_sar_num = 1;
                p_dec->fmt_out.video.i_sar_den = 1;
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            }
        }

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        /* Send decoded frame to vout */
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        if( i_pts > VLC_TS_INVALID)
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        {
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            p_pic->date = i_pts;
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            if( p_sys->b_first_frame )
            {
                /* Hack to force display of still pictures */
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                p_sys->b_first_frame = false;
                p_pic->b_force = true;
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            }

            p_pic->i_nb_fields = 2 + p_sys->p_ff_pic->repeat_pict;
            p_pic->b_progressive = !p_sys->p_ff_pic->interlaced_frame;
            p_pic->b_top_field_first = p_sys->p_ff_pic->top_field_first;

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            p_pic->i_qstride = p_sys->p_ff_pic->qstride;
            int i_mb_h = ( p_pic->format.i_height + 15 ) / 16;
            p_pic->p_q = malloc( p_pic->i_qstride * i_mb_h );
            memcpy( p_pic->p_q, p_sys->p_ff_pic->qscale_table,
                    p_pic->i_qstride * i_mb_h );
            switch( p_sys->p_ff_pic->qscale_type )
            {
                case FF_QSCALE_TYPE_MPEG1:
                    p_pic->i_qtype = QTYPE_MPEG1;
                    break;
                case FF_QSCALE_TYPE_MPEG2:
                    p_pic->i_qtype = QTYPE_MPEG2;
                    break;
                case FF_QSCALE_TYPE_H264:
                    p_pic->i_qtype = QTYPE_H264;
                    break;
            }

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            return p_pic;
        }
        else
        {
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            decoder_DeletePicture( p_dec, p_pic );
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        }
    }

    block_Release( p_block );
    return NULL;
}

/*****************************************************************************
 * EndVideo: decoder destruction
 *****************************************************************************
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 * This function is called when the thread ends after a successful
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 * initialization.
 *****************************************************************************/
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void EndVideoDec( decoder_t *p_dec )
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{
    decoder_sys_t *p_sys = p_dec->p_sys;

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    post_mt( p_sys );

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    /* do not flush buffers if codec hasn't been opened (theora/vorbis/VC1) */
    if( p_sys->p_context->codec )
        avcodec_flush_buffers( p_sys->p_context );
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    wait_mt( p_sys );

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    if( p_sys->p_ff_pic ) av_free( p_sys->p_ff_pic );
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    if( p_sys->p_va )
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    {
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        vlc_va_Delete( p_sys->p_va );
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        p_sys->p_va = NULL;
    }
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    vlc_sem_destroy( &p_sys->sem_mt );
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}

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/*****************************************************************************
 * ffmpeg_InitCodec: setup codec extra initialization data for ffmpeg
 *****************************************************************************/
static void ffmpeg_InitCodec( decoder_t *p_dec )
{
    decoder_sys_t *p_sys = p_dec->p_sys;
    int i_size = p_dec->fmt_in.i_extra;

    if( !i_size ) return;

    if( p_sys->i_codec_id == CODEC_ID_SVQ3 )
    {
        uint8_t *p;

        p_sys->p_context->extradata_size = i_size + 12;
        p = p_sys->p_context->extradata  =
            malloc( p_sys->p_context->extradata_size );
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        if( !p )
            return;
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        memcpy( &p[0],  "SVQ3", 4 );
        memset( &p[4], 0, 8 );
        memcpy( &p[12], p_dec->fmt_in.p_extra, i_size );

        /* Now remove all atoms before the SMI one */
        if( p_sys->p_context->extradata_size > 0x5a &&
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            strncmp( (char*)&p[0x56], "SMI ", 4 ) )
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        {
            uint8_t *psz = &p[0x52];

            while( psz < &p[p_sys->p_context->extradata_size - 8] )
            {
                int i_size = GetDWBE( psz );
                if( i_size <= 1 )
                {
                    /* FIXME handle 1 as long size */
                    break;
                }
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                if( !strncmp( (char*)&psz[4], "SMI ", 4 ) )
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                {
                    memmove( &p[0x52], psz,
                             &p[p_sys->p_context->extradata_size] - psz );
                    break;
                }

                psz += i_size;
            }
        }
    }
    else
    {
        p_sys->p_context->extradata_size = i_size;
        p_sys->p_context->extradata =
            malloc( i_size + FF_INPUT_BUFFER_PADDING_SIZE );
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        if( p_sys->p_context->extradata )
        {
            memcpy( p_sys->p_context->extradata,
                    p_dec->fmt_in.p_extra, i_size );
            memset( &((uint8_t*)p_sys->p_context->extradata)[i_size],
                    0, FF_INPUT_BUFFER_PADDING_SIZE );
        }
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