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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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#include <vlc_common.h>
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#include <vlc_codec.h>
#include <vlc_vout.h>
#include <vlc_input.h>                  /* hmmm, just for INPUT_RATE_DEFAULT */
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#include <vlc_codecs.h>                               /* BITMAPINFOHEADER */
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/* ffmpeg header */
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#ifdef HAVE_LIBAVCODEC_AVCODEC_H
#   include <libavcodec/avcodec.h>
#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 "chroma.h"
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/*****************************************************************************
 * decoder_sys_t : decoder descriptor
 *****************************************************************************/
struct decoder_sys_t
{
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    FFMPEG_COMMON_MEMBERS
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    /* Video decoder specific part */
    mtime_t input_pts;
    mtime_t input_dts;
    mtime_t i_pts;

    AVFrame          *p_ff_pic;
    BITMAPINFOHEADER *p_format;

    /* for frame skipping algo */
    int 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 */
    int b_direct_rendering;

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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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    int i_buffer_orig, i_buffer;
    char *p_buffer_orig, *p_buffer;
};

/* FIXME (dummy palette for now) */
static AVPaletteControl palette_control;

/*****************************************************************************
 * 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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static void ffmpeg_NextPts( decoder_t *, int i_block_rate );
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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 )
{
    picture_t *p_pic;

    p_dec->fmt_out.video.i_width = p_context->width;
    p_dec->fmt_out.video.i_height = p_context->height;
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    p_dec->fmt_out.i_codec = GetVlcChroma( p_context->pix_fmt );
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    if( !p_context->width || !p_context->height )
    {
        return NULL; /* invalid display size */
    }

    if( !p_dec->fmt_out.i_codec )
    {
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        /* we are doomed */
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        p_dec->fmt_out.i_codec = VLC_FOURCC('I','4','2','0');
    }

    /* If an aspect-ratio was specified in the input format then force it */
    if( p_dec->fmt_in.video.i_aspect )
    {
        p_dec->fmt_out.video.i_aspect = p_dec->fmt_in.video.i_aspect;
    }
    else
    {
        p_dec->fmt_out.video.i_aspect =
            VOUT_ASPECT_FACTOR * ( av_q2d(p_context->sample_aspect_ratio) *
                p_context->width / p_context->height );
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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_aspect == 0 )
        {
            p_dec->fmt_out.video.i_aspect =
                VOUT_ASPECT_FACTOR * p_context->width / p_context->height;
        }
    }

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    if( p_dec->fmt_out.video.i_frame_rate > 0 &&
        p_dec->fmt_out.video.i_frame_rate_base > 0 )
    {
        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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    p_pic = p_dec->pf_vout_buffer_new( p_dec );

    return p_pic;
}

/*****************************************************************************
 * 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;
    vlc_value_t val;

    /* Allocate the memory needed to store the decoder's structure */
    if( ( p_dec->p_sys = p_sys =
          (decoder_sys_t *)malloc(sizeof(decoder_sys_t)) ) == NULL )
    {
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        return VLC_ENOMEM;
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    }
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    memset( p_sys, 0, sizeof(decoder_sys_t) );
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    p_dec->p_sys->p_context = p_context;
    p_dec->p_sys->p_codec = p_codec;
    p_dec->p_sys->i_codec_id = i_codec_id;
    p_dec->p_sys->psz_namecodec = psz_namecodec;
    p_sys->p_ff_pic = avcodec_alloc_frame();

    /* ***** Fill p_context with init values ***** */
    p_sys->p_context->codec_tag = ffmpeg_CodecTag( p_dec->fmt_in.i_codec );
    p_sys->p_context->width  = p_dec->fmt_in.video.i_width;
    p_sys->p_context->height = p_dec->fmt_in.video.i_height;
    p_sys->p_context->bits_per_sample = p_dec->fmt_in.video.i_bits_per_pixel;

    /*  ***** Get configuration of ffmpeg plugin ***** */
    p_sys->p_context->workaround_bugs =
        config_GetInt( p_dec, "ffmpeg-workaround-bugs" );
    p_sys->p_context->error_resilience =
        config_GetInt( p_dec, "ffmpeg-error-resilience" );

    var_Create( p_dec, "grayscale", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
    var_Get( p_dec, "grayscale", &val );
    if( val.b_bool ) p_sys->p_context->flags |= CODEC_FLAG_GRAY;

    var_Create( p_dec, "ffmpeg-vismv", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Get( p_dec, "ffmpeg-vismv", &val );
    if( val.i_int ) p_sys->p_context->debug_mv = val.i_int;

    var_Create( p_dec, "ffmpeg-lowres", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Get( p_dec, "ffmpeg-lowres", &val );
    if( val.i_int > 0 && val.i_int <= 2 ) p_sys->p_context->lowres = val.i_int;

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    var_Create( p_dec, "ffmpeg-skiploopfilter",
                VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Get( p_dec, "ffmpeg-skiploopfilter", &val );
    if( val.i_int > 0 ) p_sys->p_context->skip_loop_filter = AVDISCARD_NONREF;
    if( val.i_int > 1 ) p_sys->p_context->skip_loop_filter = AVDISCARD_BIDIR;
    if( val.i_int > 2 ) p_sys->p_context->skip_loop_filter = AVDISCARD_NONKEY;
    if( val.i_int > 3 ) p_sys->p_context->skip_loop_filter = AVDISCARD_ALL;

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    /* ***** ffmpeg frame skipping ***** */
    var_Create( p_dec, "ffmpeg-hurry-up", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
    var_Get( p_dec, "ffmpeg-hurry-up", &val );
    p_sys->b_hurry_up = val.b_bool;

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    var_Create( p_dec, "ffmpeg-skip-frame", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Get( p_dec, "ffmpeg-skip-frame", &val );
    switch( val.i_int )
    {
        case -1:
            p_sys->p_context->skip_frame = AVDISCARD_NONE;
            break;
        case 0:
            p_sys->p_context->skip_frame = AVDISCARD_DEFAULT;
            break;
        case 1:
            p_sys->p_context->skip_frame = AVDISCARD_BIDIR;
            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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    var_Create( p_dec, "ffmpeg-skip-idct",  VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );
    var_Get( p_dec, "ffmpeg-skip-idct", &val );
    switch( val.i_int )
    {
        case -1:
            p_sys->p_context->skip_idct = AVDISCARD_NONE;
            break;
        case 0:
            p_sys->p_context->skip_idct = AVDISCARD_DEFAULT;
            break;
        case 1:
            p_sys->p_context->skip_idct = AVDISCARD_BIDIR;
            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 ***** */
    p_sys->b_direct_rendering = 0;
    var_Create( p_dec, "ffmpeg-dr", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
    var_Get( p_dec, "ffmpeg-dr", &val );
    if( val.b_bool && (p_sys->p_codec->capabilities & CODEC_CAP_DR1) &&
        /* Apparently direct rendering doesn't work with YUV422P */
        p_sys->p_context->pix_fmt != PIX_FMT_YUV422P &&
        /* H264 uses too many reference frames */
        p_sys->i_codec_id != CODEC_ID_H264 &&
        !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() */
        p_sys->b_direct_rendering = 1;
    }

    /* ffmpeg doesn't properly release old pictures when frames are skipped */
    //if( p_sys->b_hurry_up ) p_sys->b_direct_rendering = 0;
    if( p_sys->b_direct_rendering )
    {
        msg_Dbg( p_dec, "using direct rendering" );
        p_sys->p_context->flags |= CODEC_FLAG_EMU_EDGE;
    }

    /* 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;

    /* ***** init this codec with special data ***** */
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    ffmpeg_InitCodec( p_dec );
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    /* ***** misc init ***** */
    p_sys->input_pts = p_sys->input_dts = 0;
    p_sys->i_pts = 0;
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    p_sys->b_has_b_frames = false;
    p_sys->b_first_frame = true;
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    p_sys->i_late_frames = 0;
    p_sys->i_buffer = 0;
    p_sys->i_buffer_orig = 1;
    p_sys->p_buffer_orig = p_sys->p_buffer = malloc( p_sys->i_buffer_orig );
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    if( !p_sys->p_buffer_orig )
    {
        free( p_sys );
        return VLC_ENOMEM;
    }
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    /* Set output properties */
    p_dec->fmt_out.i_cat = VIDEO_ES;
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    p_dec->fmt_out.i_codec = GetVlcChroma( p_context->pix_fmt );
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    /* Setup palette */
    if( p_dec->fmt_in.video.p_palette )
        p_sys->p_context->palctrl =
            (AVPaletteControl *)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 = &palette_control;

    /* ***** Open the codec ***** */
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    vlc_mutex_t *lock = var_AcquireMutex( "avcodec" );
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    if( lock == NULL )
    {
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        free( p_sys->p_buffer_orig );
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        free( p_sys );
        return VLC_ENOMEM;
    }

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    if( avcodec_open( p_sys->p_context, p_sys->p_codec ) < 0 )
    {
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        vlc_mutex_unlock( lock );
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        msg_Err( p_dec, "cannot open codec (%s)", p_sys->psz_namecodec );
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        free( p_sys->p_buffer_orig );
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        free( p_sys );
        return VLC_EGENERIC;
    }
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    vlc_mutex_unlock( lock );
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    msg_Dbg( p_dec, "ffmpeg codec (%s) started", p_sys->psz_namecodec );


    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;
    int b_drawpicture;
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    int b_null_size = false;
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    block_t *p_block;

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

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    if( !p_sys->p_context->extradata_size && p_dec->fmt_in.i_extra )
        ffmpeg_InitCodec( p_dec );

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    p_block = *pp_block;

    if( p_block->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED) )
    {
        p_sys->i_buffer = 0;
        p_sys->i_pts = 0; /* To make sure we recover properly */

        p_sys->input_pts = p_sys->input_dts = 0;
        p_sys->i_late_frames = 0;

        block_Release( p_block );
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        //if( p_block->i_flags & BLOCK_FLAG_CORRUPTED )
            //avcodec_flush_buffers( p_sys->p_context );
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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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    {
        if( p_sys->i_pts )
        {
            msg_Err( p_dec, "more than 5 seconds of late video -> "
                     "dropping frame (computer too slow ?)" );
            p_sys->i_pts = 0; /* To make sure we recover properly */
        }
        block_Release( p_block );
        p_sys->i_late_frames--;
        return NULL;
    }

    if( p_block->i_pts > 0 || p_block->i_dts > 0 )
    {
        p_sys->input_pts = p_block->i_pts;
        p_sys->input_dts = p_block->i_dts;

        /* Make sure we don't reuse the same timestamps twice */
        p_block->i_pts = p_block->i_dts = 0;
    }

    /* 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_sys->p_context->skip_frame =
                    (p_sys->i_skip_frame <= AVDISCARD_BIDIR) ?
                    AVDISCARD_BIDIR : 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 );
            p_sys->i_buffer = 0;
            return NULL;
        }
    }
    else
    {
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        if( p_sys->b_hurry_up )
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            p_sys->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;
    }

    if( p_sys->p_context->width <= 0 || p_sys->p_context->height <= 0 )
    {
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        if( p_sys->b_hurry_up )
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            p_sys->p_context->skip_frame = p_sys->i_skip_frame;
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        b_null_size = true;
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    }

    /*
     * Do the actual decoding now
     */

    /* Don't forget that ffmpeg requires a little more bytes
     * that the real frame size */
    if( p_block->i_buffer > 0 )
    {
        p_sys->i_buffer = p_block->i_buffer;
        if( p_sys->i_buffer + FF_INPUT_BUFFER_PADDING_SIZE >
            p_sys->i_buffer_orig )
        {
            free( p_sys->p_buffer_orig );
            p_sys->i_buffer_orig =
                p_block->i_buffer + FF_INPUT_BUFFER_PADDING_SIZE;
            p_sys->p_buffer_orig = malloc( p_sys->i_buffer_orig );
        }
        p_sys->p_buffer = p_sys->p_buffer_orig;
        p_sys->i_buffer = p_block->i_buffer;
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        if( !p_sys->p_buffer )
        {
            block_Release( p_block );
            return NULL;
        }
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        vlc_memcpy( p_sys->p_buffer, p_block->p_buffer, p_block->i_buffer );
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        memset( p_sys->p_buffer + p_block->i_buffer, 0,
                FF_INPUT_BUFFER_PADDING_SIZE );

        p_block->i_buffer = 0;
    }

    while( p_sys->i_buffer > 0 )
    {
        int i_used, b_gotpicture;
        picture_t *p_pic;

        i_used = avcodec_decode_video( p_sys->p_context, p_sys->p_ff_pic,
                                       &b_gotpicture,
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                                       (uint8_t*)p_sys->p_buffer, p_sys->i_buffer );
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        if( b_null_size && p_sys->p_context->width > 0 &&
            p_sys->p_context->height > 0 )
        {
            /* 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_sys->p_context->skip_frame = p_sys->i_skip_frame;
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            i_used = avcodec_decode_video( p_sys->p_context, p_sys->p_ff_pic,
                                           &b_gotpicture,
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                                           (uint8_t*)p_sys->p_buffer, p_sys->i_buffer );
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        }

        if( i_used < 0 )
        {
            msg_Warn( p_dec, "cannot decode one frame (%d bytes)",
                      p_sys->i_buffer );
            block_Release( p_block );
            return NULL;
        }
        else if( i_used > p_sys->i_buffer )
        {
            i_used = p_sys->i_buffer;
        }

        /* Consumed bytes */
        p_sys->i_buffer -= i_used;
        p_sys->p_buffer += i_used;

        /* Nothing to display */
        if( !b_gotpicture )
        {
            if( i_used == 0 ) break;
            continue;
        }

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        /* Set the PTS */
        if( p_sys->p_ff_pic->pts )
            p_sys->i_pts = p_sys->p_ff_pic->pts;

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        /* Update frame late count (except when doing preroll) */
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        if( p_sys->i_pts && decoder_GetDisplayDate(p_dec, p_sys->i_pts) <= mdate() &&
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            !(p_block->i_flags & BLOCK_FLAG_PREROLL) )
        {
            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;
        }

        if( !b_drawpicture || !p_sys->p_ff_pic->linesize[0] )
        {
            /* Do not display the picture */
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            p_pic = (picture_t *)p_sys->p_ff_pic->opaque;
            if( !b_drawpicture && p_pic )
                p_dec->pf_vout_buffer_del( p_dec, p_pic );
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            ffmpeg_NextPts( p_dec, p_block->i_rate );
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            continue;
        }

        if( !p_sys->p_ff_pic->opaque )
        {
            /* Get a new picture */
            p_pic = ffmpeg_NewPictBuf( p_dec, p_sys->p_context );
            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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        /* Sanity check (seems to be needed for some streams) */
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        if( p_sys->p_ff_pic->pict_type == FF_B_TYPE )
        {
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            p_sys->b_has_b_frames = true;
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        }

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        if( !p_dec->fmt_in.video.i_aspect )
        {
            /* Fetch again the aspect ratio in case it changed */
            p_dec->fmt_out.video.i_aspect =
                VOUT_ASPECT_FACTOR
                    * ( av_q2d(p_sys->p_context->sample_aspect_ratio)
                    * p_sys->p_context->width / p_sys->p_context->height );
            p_dec->fmt_out.video.i_sar_num
                = p_sys->p_context->sample_aspect_ratio.num;
            p_dec->fmt_out.video.i_sar_den
                = p_sys->p_context->sample_aspect_ratio.den;
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            if( p_dec->fmt_out.video.i_aspect == 0 )
            {
                p_dec->fmt_out.video.i_aspect = VOUT_ASPECT_FACTOR
                    * p_sys->p_context->width / p_sys->p_context->height;
            }
        }

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        /* Send decoded frame to vout */
        if( p_sys->i_pts )
        {
            p_pic->date = p_sys->i_pts;

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            ffmpeg_NextPts( p_dec, p_block->i_rate );
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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;

            return p_pic;
        }
        else
        {
            p_dec->pf_vout_buffer_del( p_dec, p_pic );
        }
    }

    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;

    if( p_sys->p_ff_pic ) av_free( p_sys->p_ff_pic );
    free( p_sys->p_buffer_orig );
}

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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 if( p_dec->fmt_in.i_codec == VLC_FOURCC( 'R', 'V', '1', '0' ) ||
             p_dec->fmt_in.i_codec == VLC_FOURCC( 'R', 'V', '1', '3' ) ||
             p_dec->fmt_in.i_codec == VLC_FOURCC( 'R', 'V', '2', '0' ) )
    {
        if( p_dec->fmt_in.i_extra == 8 )
        {
            p_sys->p_context->extradata_size = 8;
            p_sys->p_context->extradata = malloc( 8 );
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            if( p_sys->p_context->extradata )
            {
                memcpy( p_sys->p_context->extradata,
                        p_dec->fmt_in.p_extra, p_dec->fmt_in.i_extra );
                p_sys->p_context->sub_id = ((uint32_t*)p_dec->fmt_in.p_extra)[1];
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                msg_Warn( p_dec, "using extra data for RV codec sub_id=%08x",
                          p_sys->p_context->sub_id );
            }
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        }
    }
    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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    }
}

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/*****************************************************************************
 * ffmpeg_CopyPicture: copy a picture from ffmpeg internal buffers to a
 *                     picture_t structure (when not in direct rendering mode).
 *****************************************************************************/
static void ffmpeg_CopyPicture( decoder_t *p_dec,
                                picture_t *p_pic, AVFrame *p_ff_pic )
{
    decoder_sys_t *p_sys = p_dec->p_sys;

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    if( GetVlcChroma( p_sys->p_context->pix_fmt ) )
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    {
        int i_plane, i_size, i_line;
        uint8_t *p_dst, *p_src;
        int i_src_stride, i_dst_stride;

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        for( i_plane = 0; i_plane < p_pic->i_planes; i_plane++ )
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        {
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            p_src  = p_ff_pic->data[i_plane];
            p_dst = p_pic->p[i_plane].p_pixels;
            i_src_stride = p_ff_pic->linesize[i_plane];
            i_dst_stride = p_pic->p[i_plane].i_pitch;

            i_size = __MIN( i_src_stride, i_dst_stride );
            for( i_line = 0; i_line < p_pic->p[i_plane].i_visible_lines;
                 i_line++ )
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            {
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                vlc_memcpy( p_dst, p_src, i_size );
                p_src += i_src_stride;
                p_dst += i_dst_stride;
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            }
        }
    }
    else
    {
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        msg_Err( p_dec, "don't know how to convert chroma %i",
                 p_sys->p_context->pix_fmt );
        p_dec->b_error = 1;
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    }
}

/*****************************************************************************
 * ffmpeg_GetFrameBuf: callback used by ffmpeg to get a frame buffer.
 *****************************************************************************
 * It is used for direct rendering as well as to get the right PTS for each
 * decoded picture (even in indirect rendering mode).
 *****************************************************************************/
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static void ffmpeg_SetFrameBufferPts( decoder_t *p_dec, AVFrame *p_ff_pic );

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static int ffmpeg_GetFrameBuf( struct AVCodecContext *p_context,
                               AVFrame *p_ff_pic )
{
    decoder_t *p_dec = (decoder_t *)p_context->opaque;
    decoder_sys_t *p_sys = p_dec->p_sys;
    picture_t *p_pic;

    /* Set picture PTS */
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    ffmpeg_SetFrameBufferPts( p_dec, p_ff_pic );
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    /* */
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    p_ff_pic->opaque = 0;

    /* Not much to do in indirect rendering mode */
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    if( !p_sys->b_direct_rendering )
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    {
        return avcodec_default_get_buffer( p_context, p_ff_pic );
    }

    /* Some codecs set pix_fmt only after the 1st frame has been decoded,
     * so this check is necessary. */
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    if( !GetVlcChroma( p_context->pix_fmt ) ||
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        p_sys->p_context->width % 16 || p_sys->p_context->height % 16 )
    {
        msg_Dbg( p_dec, "disabling direct rendering" );
        p_sys->b_direct_rendering = 0;
        return avcodec_default_get_buffer( p_context, p_ff_pic );
    }

    /* Get a new picture */
    //p_sys->p_vout->render.b_allow_modify_pics = 0;
    p_pic = ffmpeg_NewPictBuf( p_dec, p_sys->p_context );
    if( !p_pic )
    {
        p_sys->b_direct_rendering = 0;
        return avcodec_default_get_buffer( p_context, p_ff_pic );
    }
    p_sys->p_context->draw_horiz_band = NULL;

    p_ff_pic->opaque = (void*)p_pic;
    p_ff_pic->type = FF_BUFFER_TYPE_USER;
    p_ff_pic->data[0] = p_pic->p[0].p_pixels;
    p_ff_pic->data[1] = p_pic->p[1].p_pixels;
    p_ff_pic->data[2] = p_pic->p[2].p_pixels;
    p_ff_pic->data[3] = NULL; /* alpha channel but I'm not sure */

    p_ff_pic->linesize[0] = p_pic->p[0].i_pitch;
    p_ff_pic->linesize[1] = p_pic->p[1].i_pitch;
    p_ff_pic->linesize[2] = p_pic->p[2].i_pitch;
    p_ff_pic->linesize[3] = 0;

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    if( p_ff_pic->reference != 0 )
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    {
        p_dec->pf_picture_link( p_dec, p_pic );
    }

    /* FIXME what is that, should give good value */
    p_ff_pic->age = 256*256*256*64; // FIXME FIXME from ffmpeg

    return 0;
}
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static int  ffmpeg_ReGetFrameBuf( struct AVCodecContext *p_context, AVFrame *p_ff_pic )
{
    decoder_t *p_dec = (decoder_t *)p_context->opaque;

    /* Set picture PTS */
    ffmpeg_SetFrameBufferPts( p_dec, p_ff_pic );

    /* We always use default reget function, it works perfectly fine */
    return avcodec_default_reget_buffer( p_context, p_ff_pic );
}

static void ffmpeg_SetFrameBufferPts( decoder_t *p_dec, AVFrame *p_ff_pic )
{
    decoder_sys_t *p_sys = p_dec->p_sys;

    /* Set picture PTS */
    if( p_sys->input_pts )
    {
        p_ff_pic->pts = p_sys->input_pts;
    }
    else if( p_sys->input_dts )
    {
        /* Some demuxers only set the dts so let's try to find a useful
         * timestamp from this */
        if( !p_sys->p_context->has_b_frames || !p_sys->b_has_b_frames ||
            !p_ff_pic->reference || !p_sys->i_pts )
        {
            p_ff_pic->pts = p_sys->input_dts;
        }
        else p_ff_pic->pts = 0;
    }
    else p_ff_pic->pts = 0;

    if( p_sys->i_pts ) /* make sure 1st frame has a pts > 0 */
    {
        p_sys->input_pts = p_sys->input_dts = 0;
    }
}
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static void ffmpeg_ReleaseFrameBuf( struct AVCodecContext *p_context,
                                    AVFrame *p_ff_pic )
{
    decoder_t *p_dec = (decoder_t *)p_context->opaque;
    picture_t *p_pic;

    if( !p_ff_pic->opaque )
    {
        avcodec_default_release_buffer( p_context, p_ff_pic );
        return;
    }

    p_pic = (picture_t*)p_ff_pic->opaque;

    p_ff_pic->data[0] = NULL;
    p_ff_pic->data[1] = NULL;
    p_ff_pic->data[2] = NULL;
    p_ff_pic->data[3] = NULL;

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    if( p_ff_pic->reference != 0 )
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    {
        p_dec->pf_picture_unlink( p_dec, p_pic );
    }
}
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static void ffmpeg_NextPts( decoder_t *p_dec, int i_block_rate )
{
    decoder_sys_t *p_sys = p_dec->p_sys;

    if( p_sys->i_pts <= 0 )
        return;

    /* 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 *
            i_block_rate / INPUT_RATE_DEFAULT /
            (2 * p_dec->fmt_in.video.i_frame_rate);
    }
    else if( p_sys->p_context->time_base.den > 0 )
    {
        p_sys->i_pts += INT64_C(1000000) *
            (2 + p_sys->p_ff_pic->repeat_pict) *
            p_sys->p_context->time_base.num *
            i_block_rate / INPUT_RATE_DEFAULT /
            (2 * p_sys->p_context->time_base.den);
    }
}