#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <time.h>

#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"

#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "mpbswap.h"

#include "vd_internal.h"

static vd_info_t info = {
	"FFmpeg's libavcodec codec family",
	"ffmpeg",
	"A'rpi",
	"A'rpi, Michael, Alex",
	"native codecs (http://ffmpeg.sf.net/)"
};

LIBVD_EXTERN(ffmpeg)

#ifdef USE_LIBAVCODEC_SO
#include <ffmpeg/avcodec.h>
#else
#include "libavcodec/avcodec.h"
#endif

#ifdef HAVE_XVMC
#include "xvmc_render.h"
#endif

int avcodec_inited=0;

typedef struct {
    AVCodecContext *avctx;
    AVFrame *pic;
    enum PixelFormat pix_fmt;
    int do_slices;
    int do_dr1;
    int vo_inited;
    int best_csp;
    int b_age;
    int ip_age[2];
    int qp_stat[32];
    double qp_sum;
    double inv_qp_sum;
    int ip_count;
    int b_count;
    AVRational last_sample_aspect_ratio;
} vd_ffmpeg_ctx;

//#ifdef USE_LIBPOSTPROC
//unsigned int lavc_pp=0;
//#endif

#include "m_option.h"

static int get_buffer(AVCodecContext *avctx, AVFrame *pic);
static void release_buffer(AVCodecContext *avctx, AVFrame *pic);
static enum PixelFormat get_format(struct AVCodecContext * avctx, 
                                   const enum PixelFormat * pix_fmt);

#ifdef HAVE_XVMC
static int mc_get_buffer(AVCodecContext *avctx, AVFrame *pic);
static void mc_release_buffer(AVCodecContext *avctx, AVFrame *pic);
static void mc_render_slice(struct AVCodecContext *s,
                	AVFrame *src, int offset[4],
                	int y, int type, int height);
#endif

static int lavc_param_workaround_bugs= FF_BUG_AUTODETECT;
static int lavc_param_error_resilience=2;
static int lavc_param_error_concealment=3;
static int lavc_param_gray=0;
static int lavc_param_vstats=0;
static int lavc_param_idct_algo=0;
static int lavc_param_debug=0;
static int lavc_param_vismv=0;
static int lavc_param_skip_top=0;
static int lavc_param_skip_bottom=0;
static int lavc_param_fast=0;
static int lavc_param_lowres=0;
static char *lavc_param_lowres_str=NULL;
static char *lavc_param_skip_loop_filter_str = NULL;
static char *lavc_param_skip_idct_str = NULL;
static char *lavc_param_skip_frame_str = NULL;
static int lavc_param_threads=1;
static int lavc_param_bitexact=0;

m_option_t lavc_decode_opts_conf[]={
	{"bug", &lavc_param_workaround_bugs, CONF_TYPE_INT, CONF_RANGE, -1, 999999, NULL},
	{"er", &lavc_param_error_resilience, CONF_TYPE_INT, CONF_RANGE, 0, 99, NULL},
	{"gray", &lavc_param_gray, CONF_TYPE_FLAG, 0, 0, CODEC_FLAG_PART, NULL},
	{"idct", &lavc_param_idct_algo, CONF_TYPE_INT, CONF_RANGE, 0, 99, NULL},
	{"ec", &lavc_param_error_concealment, CONF_TYPE_INT, CONF_RANGE, 0, 99, NULL},
	{"vstats", &lavc_param_vstats, CONF_TYPE_FLAG, 0, 0, 1, NULL},
	{"debug", &lavc_param_debug, CONF_TYPE_INT, CONF_RANGE, 0, 9999999, NULL},
	{"vismv", &lavc_param_vismv, CONF_TYPE_INT, CONF_RANGE, 0, 9999999, NULL},
	{"st", &lavc_param_skip_top, CONF_TYPE_INT, CONF_RANGE, 0, 999, NULL},
	{"sb", &lavc_param_skip_bottom, CONF_TYPE_INT, CONF_RANGE, 0, 999, NULL},
#ifdef CODEC_FLAG2_FAST
        {"fast", &lavc_param_fast, CONF_TYPE_FLAG, 0, 0, CODEC_FLAG2_FAST, NULL},
#endif
	{"lowres", &lavc_param_lowres_str, CONF_TYPE_STRING, 0, 0, 0, NULL},
	{"skiploopfilter", &lavc_param_skip_loop_filter_str, CONF_TYPE_STRING, 0, 0, 0, NULL},
	{"skipidct", &lavc_param_skip_idct_str, CONF_TYPE_STRING, 0, 0, 0, NULL},
	{"skipframe", &lavc_param_skip_frame_str, CONF_TYPE_STRING, 0, 0, 0, NULL},
        {"threads", &lavc_param_threads, CONF_TYPE_INT, CONF_RANGE, 1, 8, NULL},
        {"bitexact", &lavc_param_bitexact, CONF_TYPE_FLAG, 0, 0, CODEC_FLAG_BITEXACT, NULL},
	{NULL, NULL, 0, 0, 0, 0, NULL}
};

static enum AVDiscard str2AVDiscard(char *str) {
  if (!str)
    return AVDISCARD_DEFAULT;
  if (strcasecmp(str, "none") == 0)
    return AVDISCARD_NONE;
  if (strcasecmp(str, "default") == 0)
    return AVDISCARD_DEFAULT;
  if (strcasecmp(str, "nonref") == 0)
    return AVDISCARD_NONREF;
  if (strcasecmp(str, "bidir") == 0)
    return AVDISCARD_BIDIR;
  if (strcasecmp(str, "nonkey") == 0)
    return AVDISCARD_NONKEY;
  if (strcasecmp(str, "all") == 0)
    return AVDISCARD_ALL;
  mp_msg(MSGT_DECVIDEO, MSGL_ERR, "Unknown discard value %s\n", str);
  return AVDISCARD_DEFAULT;
}

// to set/get/query special features/parameters
static int control(sh_video_t *sh,int cmd,void* arg,...){
    vd_ffmpeg_ctx *ctx = sh->context;
    AVCodecContext *avctx = ctx->avctx;
    switch(cmd){
    case VDCTRL_QUERY_FORMAT:
        {
            int format =(*((int*)arg));
	    if( format == ctx->best_csp ) return CONTROL_TRUE;//supported
	// possible conversions:
	    switch( format ){
        case IMGFMT_YV12:
        case IMGFMT_IYUV:
        case IMGFMT_I420:
	    // "converted" using pointer/stride modification
	    if(avctx->pix_fmt==PIX_FMT_YUV420P) return CONTROL_TRUE;// u/v swap
	    if(avctx->pix_fmt==PIX_FMT_YUV422P && !ctx->do_dr1) return CONTROL_TRUE;// half stride
	    break;
#ifdef HAVE_XVMC
        case IMGFMT_XVMC_IDCT_MPEG2:
        case IMGFMT_XVMC_MOCO_MPEG2:
            if(avctx->pix_fmt==PIX_FMT_XVMC_MPEG2_IDCT) return CONTROL_TRUE;
#endif
	}
        return CONTROL_FALSE;
        }
    break;
    case VDCTRL_RESYNC_STREAM:
        avcodec_flush_buffers(avctx);
	return CONTROL_TRUE;
    case VDCTRL_QUERY_UNSEEN_FRAMES:
	return avctx->has_b_frames + 10;
    }
    return CONTROL_UNKNOWN;
}

void mp_msp_av_log_callback(void* ptr, int level, const char* fmt, va_list vl)
{
    static int print_prefix=1;
    AVClass* avc= ptr ? *(AVClass**)ptr : NULL;
    int type= MSGT_FIXME;
    int mp_level;
    char buf[256];

    switch(level){
    case AV_LOG_DEBUG:  mp_level= MSGL_V   ; break;
    case AV_LOG_INFO :  mp_level= MSGL_INFO; break;
    case AV_LOG_ERROR:  mp_level= MSGL_ERR ; break;
    default          :  mp_level= MSGL_ERR ; break;
    }

    if (!mp_msg_test(type, mp_level)) return;

    if(ptr){
        if(!strcmp(avc->class_name, "AVCodecContext")){
            AVCodecContext * s= ptr;
            if(s->codec){
                if(s->codec->type == CODEC_TYPE_AUDIO){
                    if(s->codec->decode)
                        type= MSGT_DECAUDIO;
                }else if(s->codec->type == CODEC_TYPE_VIDEO){
                    if(s->codec->decode)
                        type= MSGT_DECVIDEO;
                }
                //FIXME subtitles, encoders (what msgt for them? there is no appropriate ...)
            }
        }else if(!strcmp(avc->class_name, "AVFormatContext")){
#if 0 //needs libavformat include FIXME iam too lazy to do this cleanly,probably the whole should be moved out of this file ...
            AVFormatContext * s= ptr;
            if(s->iformat)
                type= MSGT_DEMUXER;
            else if(s->oformat)
                type= MSGT_MUXER;
#endif
        }
    }

    if(print_prefix && avc) {
        mp_msg(type, mp_level, "[%s @ %p]", avc->item_name(ptr), avc);
    }

    print_prefix= strchr(fmt, '\n') != NULL;
    vsnprintf(buf, sizeof(buf), fmt, vl);
    mp_msg(type, mp_level, buf);
}

// init driver
static int init(sh_video_t *sh){
    AVCodecContext *avctx;
    vd_ffmpeg_ctx *ctx;
    AVCodec *lavc_codec;
    int lowres_w=0;
    int do_vis_debug= lavc_param_vismv || (lavc_param_debug&(FF_DEBUG_VIS_MB_TYPE|FF_DEBUG_VIS_QP));

    if(!avcodec_inited){
      avcodec_init();
      avcodec_register_all();
      avcodec_inited=1;
      av_log_set_callback(mp_msp_av_log_callback);
    }

    ctx = sh->context = malloc(sizeof(vd_ffmpeg_ctx));
    if (!ctx)
	return(0);
    memset(ctx, 0, sizeof(vd_ffmpeg_ctx));
    
    lavc_codec = (AVCodec *)avcodec_find_decoder_by_name(sh->codec->dll);
    if(!lavc_codec){
	mp_msg(MSGT_DECVIDEO,MSGL_ERR,MSGTR_MissingLAVCcodec,sh->codec->dll);
        uninit(sh);
	return 0;
    }

    if(vd_use_slices && (lavc_codec->capabilities&CODEC_CAP_DRAW_HORIZ_BAND) && !do_vis_debug)
	ctx->do_slices=1;
 
    if(lavc_codec->capabilities&CODEC_CAP_DR1 && !do_vis_debug && lavc_codec->id != CODEC_ID_H264 && lavc_codec->id != CODEC_ID_INTERPLAY_VIDEO)
	ctx->do_dr1=1;
    ctx->b_age= ctx->ip_age[0]= ctx->ip_age[1]= 256*256*256*64;
    ctx->ip_count= ctx->b_count= 0;

    ctx->pic = avcodec_alloc_frame();
    ctx->avctx = avcodec_alloc_context();
    avctx = ctx->avctx;

#ifdef HAVE_XVMC

#ifdef CODEC_CAP_HWACCEL
    if(lavc_codec->capabilities & CODEC_CAP_HWACCEL){
#else
    if(lavc_codec->id == CODEC_ID_MPEG2VIDEO_XVMC){
#endif
        mp_msg(MSGT_DECVIDEO, MSGL_INFO, MSGTR_MPCODECS_XVMCAcceleratedCodec);
        assert(ctx->do_dr1);//these are must to!
        assert(ctx->do_slices); //it is (vo_)ffmpeg bug if this fails
        avctx->flags|= CODEC_FLAG_EMU_EDGE;//do i need that??!!
        avctx->get_format= get_format;//for now only this decoder will use it
        avctx->get_buffer= mc_get_buffer;
        avctx->release_buffer= mc_release_buffer;
        avctx->draw_horiz_band = mc_render_slice;
        avctx->slice_flags=SLICE_FLAG_CODED_ORDER|SLICE_FLAG_ALLOW_FIELD;
    }else
#endif
    if(ctx->do_dr1){
        avctx->flags|= CODEC_FLAG_EMU_EDGE; 
        avctx->get_buffer= get_buffer;
        avctx->release_buffer= release_buffer;
        avctx->reget_buffer= get_buffer;
    }

#ifdef CODEC_FLAG_NOT_TRUNCATED
    avctx->flags|= CODEC_FLAG_NOT_TRUNCATED;
#endif
    avctx->flags|= lavc_param_bitexact;
    
    avctx->width = sh->disp_w;
    avctx->height= sh->disp_h;
    avctx->workaround_bugs= lavc_param_workaround_bugs;
    avctx->error_resilience= lavc_param_error_resilience;
    if(lavc_param_gray) avctx->flags|= CODEC_FLAG_GRAY;
#ifdef CODEC_FLAG2_FAST
    avctx->flags2|= lavc_param_fast;
#endif
    avctx->codec_tag= sh->format;
    avctx->stream_codec_tag= sh->video.fccHandler;
    avctx->idct_algo= lavc_param_idct_algo;
    avctx->error_concealment= lavc_param_error_concealment;
    avctx->debug= lavc_param_debug;
    if (lavc_param_debug)
        av_log_set_level(AV_LOG_DEBUG);
    avctx->debug_mv= lavc_param_vismv;
    avctx->skip_top   = lavc_param_skip_top;
    avctx->skip_bottom= lavc_param_skip_bottom;
    if(lavc_param_lowres_str != NULL)
    {
        sscanf(lavc_param_lowres_str, "%d,%d", &lavc_param_lowres, &lowres_w);
        if(lavc_param_lowres < 1 || lavc_param_lowres > 16 || (lowres_w > 0 && avctx->width < lowres_w))
            lavc_param_lowres = 0;
        avctx->lowres = lavc_param_lowres;
    }
    avctx->skip_loop_filter = str2AVDiscard(lavc_param_skip_loop_filter_str);
    avctx->skip_idct = str2AVDiscard(lavc_param_skip_idct_str);
    avctx->skip_frame = str2AVDiscard(lavc_param_skip_frame_str);
    mp_dbg(MSGT_DECVIDEO,MSGL_DBG2,"libavcodec.size: %d x %d\n",avctx->width,avctx->height);
    switch (sh->format) {
    case mmioFOURCC('S','V','Q','3'):
    /* SVQ3 extradata can show up as sh->ImageDesc if demux_mov is used, or
       in the phony AVI header if demux_lavf is used. The first case is
       handled here; the second case falls through to the next section. */
	if (sh->ImageDesc) {
	    avctx->extradata_size = (*(int*)sh->ImageDesc) - sizeof(int);
	    avctx->extradata = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
	    memcpy(avctx->extradata, ((int*)sh->ImageDesc)+1, avctx->extradata_size);
	    break;
	}
	/* fallthrough */

    case mmioFOURCC('A','V','R','n'):
    case mmioFOURCC('M','J','P','G'):
    /* AVRn stores huffman table in AVI header */
    /* Pegasus MJPEG stores it also in AVI header, but it uses the common
       MJPG fourcc :( */
	if (!sh->bih || sh->bih->biSize <= sizeof(BITMAPINFOHEADER))
	    break;
	avctx->flags |= CODEC_FLAG_EXTERN_HUFF;
	avctx->extradata_size = sh->bih->biSize-sizeof(BITMAPINFOHEADER);
	avctx->extradata = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
	memcpy(avctx->extradata, sh->bih+1, avctx->extradata_size);

#if 0
	{
	    int x;
	    uint8_t *p = avctx->extradata;
	    
	    for (x=0; x<avctx->extradata_size; x++)
		mp_msg(MSGT_DECVIDEO, MSGL_INFO,"[%x] ", p[x]);
	    mp_msg(MSGT_DECVIDEO, MSGL_INFO,"\n");
	}
#endif
	break;

    case mmioFOURCC('R', 'V', '1', '0'):
    case mmioFOURCC('R', 'V', '1', '3'):
    case mmioFOURCC('R', 'V', '2', '0'):
    case mmioFOURCC('R', 'V', '3', '0'):
    case mmioFOURCC('R', 'V', '4', '0'):
        if(sh->bih->biSize<sizeof(*sh->bih)+8){
            /* only 1 packet per frame & sub_id from fourcc */
            avctx->extradata_size= 8;
            avctx->extradata = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
	    ((uint32_t*)avctx->extradata)[0] = 0;
	    ((uint32_t*)avctx->extradata)[1] =
        	(sh->format == mmioFOURCC('R', 'V', '1', '3')) ? 0x10003001 : 0x10000000;
        } else {
	    /* has extra slice header (demux_rm or rm->avi streamcopy) */
	    avctx->extradata_size = sh->bih->biSize-sizeof(BITMAPINFOHEADER);
	    avctx->extradata = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
	    memcpy(avctx->extradata, sh->bih+1, avctx->extradata_size);
	}
	avctx->sub_id= AV_RB32(avctx->extradata+4);

//        printf("%X %X %d %d\n", extrahdr[0], extrahdr[1]);
        break;

    default:
	if (!sh->bih || sh->bih->biSize <= sizeof(BITMAPINFOHEADER))
	    break;
	avctx->extradata_size = sh->bih->biSize-sizeof(BITMAPINFOHEADER);
	avctx->extradata = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
	memcpy(avctx->extradata, sh->bih+1, avctx->extradata_size);
	break;
    }
    /* Pass palette to codec */
    if (sh->bih && (sh->bih->biBitCount <= 8)) {
        avctx->palctrl = calloc(1,sizeof(AVPaletteControl));
        avctx->palctrl->palette_changed = 1;
        if (sh->bih->biSize-sizeof(BITMAPINFOHEADER))
            /* Palette size in biSize */
            memcpy(avctx->palctrl->palette, sh->bih+1,
                   FFMIN(sh->bih->biSize-sizeof(BITMAPINFOHEADER), AVPALETTE_SIZE));
        else
            /* Palette size in biClrUsed */
            memcpy(avctx->palctrl->palette, sh->bih+1,
                   FFMIN(sh->bih->biClrUsed * 4, AVPALETTE_SIZE));
	}

    if(sh->bih)
	avctx->bits_per_sample= sh->bih->biBitCount;

    if(lavc_param_threads > 1)
        avcodec_thread_init(avctx, lavc_param_threads);
    /* open it */
    if (avcodec_open(avctx, lavc_codec) < 0) {
        mp_msg(MSGT_DECVIDEO,MSGL_ERR, MSGTR_CantOpenCodec);
        uninit(sh);
        return 0;
    }
    mp_msg(MSGT_DECVIDEO,MSGL_V,"INFO: libavcodec init OK!\n");
    return 1; //mpcodecs_config_vo(sh,sh->disp_w,sh->disp_h,IMGFMT_YV12);
}

// uninit driver
static void uninit(sh_video_t *sh){
    vd_ffmpeg_ctx *ctx = sh->context;
    AVCodecContext *avctx = ctx->avctx;
    
    if(lavc_param_vstats){
        int i;
        for(i=1; i<32; i++){
            mp_msg(MSGT_DECVIDEO, MSGL_INFO,"QP: %d, count: %d\n", i, ctx->qp_stat[i]);
        }
        mp_msg(MSGT_DECVIDEO, MSGL_INFO,MSGTR_MPCODECS_ArithmeticMeanOfQP, 
            ctx->qp_sum / avctx->coded_frame->coded_picture_number,
            1.0/(ctx->inv_qp_sum / avctx->coded_frame->coded_picture_number)
            );
    }

    if (avctx) {
        if (avctx->codec && avcodec_close(avctx) < 0)
            mp_msg(MSGT_DECVIDEO,MSGL_ERR, MSGTR_CantCloseCodec);

        av_freep(&avctx->extradata);
        av_freep(&avctx->palctrl);
        av_freep(&avctx->slice_offset);
    }

    av_freep(&avctx);
    av_freep(&ctx->pic);
    if (ctx)
	free(ctx);
}

static void draw_slice(struct AVCodecContext *s,
                	AVFrame *src, int offset[4],
                	int y, int type, int height){
    sh_video_t * sh = s->opaque;
    int start=0, i;
    int width= s->width;
    int skip_stride= ((width<<lavc_param_lowres)+15)>>4;
    uint8_t *skip= &s->coded_frame->mbskip_table[(y>>4)*skip_stride];
    int threshold= s->coded_frame->age;
    uint8_t *source[3]= {src->data[0] + offset[0], src->data[1] + offset[1], src->data[2] + offset[2]};
#if 0
    if(s->pict_type!=B_TYPE){
        for(i=0; i*16<width+16; i++){ 
            if(i*16>=width || skip[i]>=threshold){
                if(start==i) start++;
                else{
                    uint8_t *src2[3]= {src[0] + start*16, 
                                     src[1] + start*8, 
                                     src[2] + start*8};
//printf("%2d-%2d x %d\n", start, i, y);
                    mpcodecs_draw_slice (sh,src2, stride, (i-start)*16, height, start*16, y);
                    start= i+1;
                }
            }       
        }
    }else
#endif
    if (y < sh->disp_h) {
        mpcodecs_draw_slice (sh, source, src->linesize, sh->disp_w, (y+height)<=sh->disp_h?height:sh->disp_h-y, 0, y);
    }
}


static int init_vo(sh_video_t *sh, enum PixelFormat pix_fmt){
    vd_ffmpeg_ctx *ctx = sh->context;
    AVCodecContext *avctx = ctx->avctx;
    float aspect= av_q2d(avctx->sample_aspect_ratio) * avctx->width / avctx->height;
    int width, height;

    width = avctx->width;
    height = avctx->height;

    // HACK!
    // if sh->ImageDesc is non-NULL, it means we decode QuickTime(tm) video.
    // use dimensions from BIH to avoid black borders at the right and bottom.
    if (sh->bih && sh->ImageDesc) {
	width = sh->bih->biWidth>>lavc_param_lowres;
	height = sh->bih->biHeight>>lavc_param_lowres;
    }
    
     // it is possible another vo buffers to be used after vo config()
     // lavc reset its buffers on width/heigh change but not on aspect change!!!
    if (av_cmp_q(avctx->sample_aspect_ratio, ctx->last_sample_aspect_ratio) ||
	width != sh->disp_w  ||
	height != sh->disp_h ||
	pix_fmt != ctx->pix_fmt ||
	!ctx->vo_inited)
    {
	mp_msg(MSGT_DECVIDEO, MSGL_V, "[ffmpeg] aspect_ratio: %f\n", aspect);
	if (sh->aspect == 0 ||
	    av_cmp_q(avctx->sample_aspect_ratio, 
	             ctx->last_sample_aspect_ratio))
	    sh->aspect = aspect;
	ctx->last_sample_aspect_ratio = avctx->sample_aspect_ratio;
	sh->disp_w = width;
	sh->disp_h = height;
	ctx->pix_fmt = pix_fmt;
	switch(pix_fmt){
	// YUVJ are YUV formats that use the full Y range and not just
	// 16 - 235 (see colorspaces.txt).
	// Currently they are all treated the same way.
	case PIX_FMT_YUV410P: ctx->best_csp=IMGFMT_YVU9;break; //svq1
	case PIX_FMT_YUVJ420P:
	case PIX_FMT_YUV420P: ctx->best_csp=IMGFMT_YV12;break; //mpegs
	case PIX_FMT_YUVJ422P:
	case PIX_FMT_YUV422P: ctx->best_csp=IMGFMT_422P;break; //mjpeg / huffyuv
	case PIX_FMT_YUVJ444P:
	case PIX_FMT_YUV444P: ctx->best_csp=IMGFMT_444P;break; //photo jpeg
	case PIX_FMT_YUV411P: ctx->best_csp=IMGFMT_411P;break; //dv ntsc
	case PIX_FMT_YUYV422: ctx->best_csp=IMGFMT_YUY2;break; //huffyuv perhaps in the future
	case PIX_FMT_RGB24 :  ctx->best_csp=IMGFMT_RGB24;break; //qtrle
	case PIX_FMT_RGB32:   ctx->best_csp=IMGFMT_BGR32;break; //huffyuv / mjpeg
	case PIX_FMT_BGR24 :  ctx->best_csp=IMGFMT_BGR24;break; //8bps
	case PIX_FMT_RGB555:  ctx->best_csp=IMGFMT_BGR15;break; //rpza,cram
	case PIX_FMT_RGB565:  ctx->best_csp=IMGFMT_BGR16;break; //4xm
	case PIX_FMT_GRAY8:   ctx->best_csp=IMGFMT_Y800;break; // gray jpeg
	case PIX_FMT_PAL8:    ctx->best_csp=IMGFMT_BGR8;break; //8bps,mrle,cram
#ifdef HAVE_XVMC
        case PIX_FMT_XVMC_MPEG2_MC:ctx->best_csp=IMGFMT_XVMC_MOCO_MPEG2;break;
        case PIX_FMT_XVMC_MPEG2_IDCT:ctx->best_csp=IMGFMT_XVMC_IDCT_MPEG2;break;
#endif
	default:
	    ctx->best_csp=0;
	}
    	if (!mpcodecs_config_vo(sh,sh->disp_w,sh->disp_h, ctx->best_csp))
    		return -1;
	ctx->vo_inited = 1;
    }
    return 0;
}

static int get_buffer(AVCodecContext *avctx, AVFrame *pic){
    sh_video_t * sh = avctx->opaque;
    vd_ffmpeg_ctx *ctx = sh->context;
    mp_image_t* mpi=NULL;
    int flags= MP_IMGFLAG_ACCEPT_STRIDE | MP_IMGFLAG_PREFER_ALIGNED_STRIDE;
    int type= MP_IMGTYPE_IPB;
    int width= avctx->width;
    int height= avctx->height;
    int align=15;
//printf("get_buffer %d %d %d\n", pic->reference, ctx->ip_count, ctx->b_count);
    if(avctx->pix_fmt == PIX_FMT_YUV410P)
        align=63; //yes seriously, its really needed (16x16 chroma blocks in SVQ1 -> 64x64)

  if (pic->buffer_hints) {
    mp_msg(MSGT_DECVIDEO,MSGL_DBG2, "Buffer hints: %u\n", pic->buffer_hints);
    type = MP_IMGTYPE_TEMP;
    if (pic->buffer_hints & FF_BUFFER_HINTS_READABLE)
        flags |= MP_IMGFLAG_READABLE;
    if (pic->buffer_hints & FF_BUFFER_HINTS_PRESERVE) {
        type = MP_IMGTYPE_STATIC;
        flags |= MP_IMGFLAG_PRESERVE;
    }
    if (pic->buffer_hints & FF_BUFFER_HINTS_REUSABLE) {
        type = MP_IMGTYPE_STATIC;
        flags |= MP_IMGFLAG_PRESERVE;
    }
    flags|=(!avctx->hurry_up && ctx->do_slices) ?
            MP_IMGFLAG_DRAW_CALLBACK:0;
    mp_msg(MSGT_DECVIDEO,MSGL_DBG2, type == MP_IMGTYPE_STATIC ? "using STATIC\n" : "using TEMP\n");
  } else {
    if(!pic->reference){
        ctx->b_count++;
        flags|=(!avctx->hurry_up && ctx->do_slices) ?
                MP_IMGFLAG_DRAW_CALLBACK:0;
    }else{
        ctx->ip_count++;
        flags|= MP_IMGFLAG_PRESERVE|MP_IMGFLAG_READABLE
                | (ctx->do_slices ? MP_IMGFLAG_DRAW_CALLBACK : 0);
    }
  }

    if(init_vo(sh,avctx->pix_fmt) < 0){
        avctx->release_buffer= avcodec_default_release_buffer;
        avctx->get_buffer= avcodec_default_get_buffer;
        return avctx->get_buffer(avctx, pic);
    }

  if (!pic->buffer_hints) {
    if(ctx->b_count>1 || ctx->ip_count>2){
        mp_msg(MSGT_DECVIDEO, MSGL_WARN, MSGTR_MPCODECS_DRIFailure);

        ctx->do_dr1=0; //FIXME
        avctx->get_buffer= avcodec_default_get_buffer;
        return avctx->get_buffer(avctx, pic);
    }

    if(avctx->has_b_frames){
        type= MP_IMGTYPE_IPB;
    }else{
        type= MP_IMGTYPE_IP;
    }
    mp_msg(MSGT_DECVIDEO,MSGL_DBG2, type== MP_IMGTYPE_IPB ? "using IPB\n" : "using IP\n");
  }

    mpi= mpcodecs_get_image(sh,type, flags,
			(width+align)&(~align), (height+align)&(~align));

    // ok, let's see what did we get:
    if(  mpi->flags&MP_IMGFLAG_DRAW_CALLBACK &&
       !(mpi->flags&MP_IMGFLAG_DIRECT)){
	// nice, filter/vo likes draw_callback :)
	avctx->draw_horiz_band= draw_slice;
    } else
	avctx->draw_horiz_band= NULL;

	// Palette support: libavcodec copies palette to *data[1]
	if (mpi->bpp == 8)
		mpi->planes[1] = av_malloc(AVPALETTE_SIZE);

    pic->data[0]= mpi->planes[0];
    pic->data[1]= mpi->planes[1];
    pic->data[2]= mpi->planes[2];

#if 0    
    assert(mpi->width >= ((width +align)&(~align)));
    assert(mpi->height >= ((height+align)&(~align)));
    assert(mpi->stride[0] >= mpi->width);
    if(mpi->imgfmt==IMGFMT_I420 || mpi->imgfmt==IMGFMT_YV12 || mpi->imgfmt==IMGFMT_IYUV){
        const int y_size= mpi->stride[0] * (mpi->h-1) + mpi->w;
        const int c_size= mpi->stride[1] * ((mpi->h>>1)-1) + (mpi->w>>1);
        
        assert(mpi->planes[0] > mpi->planes[1] || mpi->planes[0] + y_size <= mpi->planes[1]);
        assert(mpi->planes[0] > mpi->planes[2] || mpi->planes[0] + y_size <= mpi->planes[2]);
        assert(mpi->planes[1] > mpi->planes[0] || mpi->planes[1] + c_size <= mpi->planes[0]);
        assert(mpi->planes[1] > mpi->planes[2] || mpi->planes[1] + c_size <= mpi->planes[2]);
        assert(mpi->planes[2] > mpi->planes[0] || mpi->planes[2] + c_size <= mpi->planes[0]);
        assert(mpi->planes[2] > mpi->planes[1] || mpi->planes[2] + c_size <= mpi->planes[1]);
    }
#endif

    /* Note, some (many) codecs in libavcodec must have stride1==stride2 && no changes between frames
     * lavc will check that and die with an error message, if its not true
     */
    pic->linesize[0]= mpi->stride[0];
    pic->linesize[1]= mpi->stride[1];
    pic->linesize[2]= mpi->stride[2];

    pic->opaque = mpi;
//printf("%X\n", (int)mpi->planes[0]);
#if 0
if(mpi->flags&MP_IMGFLAG_DIRECT)
    printf("D");
else if(mpi->flags&MP_IMGFLAG_DRAW_CALLBACK)
    printf("S");
else
    printf(".");
#endif
    if(pic->reference){
        pic->age= ctx->ip_age[0];
        
        ctx->ip_age[0]= ctx->ip_age[1]+1;
        ctx->ip_age[1]= 1;
        ctx->b_age++;
    }else{
        pic->age= ctx->b_age;
    
        ctx->ip_age[0]++;
        ctx->ip_age[1]++;
        ctx->b_age=1;
    }
    pic->type= FF_BUFFER_TYPE_USER;
    return 0;
}

static void release_buffer(struct AVCodecContext *avctx, AVFrame *pic){
    mp_image_t* mpi= pic->opaque;
    sh_video_t * sh = avctx->opaque;
    vd_ffmpeg_ctx *ctx = sh->context;
    int i;

//printf("release buffer %d %d %d\n", mpi ? mpi->flags&MP_IMGFLAG_PRESERVE : -99, ctx->ip_count, ctx->b_count); 

  if(ctx->ip_count <= 2 && ctx->b_count<=1){
    if(mpi->flags&MP_IMGFLAG_PRESERVE)
        ctx->ip_count--;
    else
        ctx->b_count--;
  }

	// Palette support: free palette buffer allocated in get_buffer
	if ( mpi && (mpi->bpp == 8))
		av_freep(&mpi->planes[1]);

    if(pic->type!=FF_BUFFER_TYPE_USER){
        avcodec_default_release_buffer(avctx, pic);
        return;
    }

    for(i=0; i<4; i++){
        pic->data[i]= NULL;
    }
//printf("R%X %X\n", pic->linesize[0], pic->data[0]);
}

// copypaste from demux_real.c - it should match to get it working!
//FIXME put into some header
typedef struct dp_hdr_s {
    uint32_t chunks;	// number of chunks
    uint32_t timestamp; // timestamp from packet header
    uint32_t len;	// length of actual data
    uint32_t chunktab;	// offset to chunk offset array
} dp_hdr_t;

void swap_palette(void *pal) {
    int i;
    uint32_t *p = pal;
    for (i = 0; i < AVPALETTE_COUNT; i++)
        p[i] = le2me_32(p[i]);
}

// decode a frame
static mp_image_t* decode(sh_video_t *sh,void* data,int len,int flags){
    int got_picture=0;
    int ret;
    vd_ffmpeg_ctx *ctx = sh->context;
    AVFrame *pic= ctx->pic;
    AVCodecContext *avctx = ctx->avctx;
    mp_image_t* mpi=NULL;
    int dr1= ctx->do_dr1;
    unsigned char *buf = NULL;

    if(len<=0) return NULL; // skipped frame

//ffmpeg interlace (mpeg2) bug have been fixed. no need of -noslices
    if (!dr1)
    avctx->draw_horiz_band=NULL;
    avctx->opaque=sh;
    if(ctx->vo_inited && !(flags&3) && !dr1){
	mpi=mpcodecs_get_image(sh, MP_IMGTYPE_EXPORT, MP_IMGFLAG_PRESERVE |
	    (ctx->do_slices?MP_IMGFLAG_DRAW_CALLBACK:0),
	    sh->disp_w, sh->disp_h);
	if(mpi && mpi->flags&MP_IMGFLAG_DRAW_CALLBACK){
	    // vd core likes slices!
	    avctx->draw_horiz_band=draw_slice;
	}
    }

    avctx->hurry_up=(flags&3)?((flags&2)?2:1):0;

//    if(sh->ds->demuxer->type == DEMUXER_TYPE_REAL){
    if(   sh->format == mmioFOURCC('R', 'V', '1', '0')
       || sh->format == mmioFOURCC('R', 'V', '1', '3')
       || sh->format == mmioFOURCC('R', 'V', '2', '0')
       || sh->format == mmioFOURCC('R', 'V', '3', '0')
       || sh->format == mmioFOURCC('R', 'V', '4', '0'))
    if(sh->bih->biSize>=sizeof(*sh->bih)+8){
        int i;
        dp_hdr_t *hdr= (dp_hdr_t*)data;
        uint32_t *offsets = (uint32_t*)(data + hdr->chunktab) + 1;
        char *end = data + len;

        if(avctx->slice_offset==NULL) 
            avctx->slice_offset= av_malloc(sizeof(int)*1000);
        
//        for(i=0; i<25; i++) printf("%02X ", ((uint8_t*)data)[i]);
        
        avctx->slice_count= FFMIN(hdr->chunks+1, 1000);
        for(i=0; i<avctx->slice_count && end >= &offsets[2*i+1]; i++)
            avctx->slice_offset[i]= offsets[2*i];
	len=hdr->len;
        data+= sizeof(dp_hdr_t);
    }

    mp_msg(MSGT_DECVIDEO, MSGL_DBG2, "vd_ffmpeg data: %04x, %04x, %04x, %04x\n",
           ((int *)data)[0], ((int *)data)[1], ((int *)data)[2], ((int *)data)[3]);
    ret = avcodec_decode_video(avctx, pic,
	     &got_picture, data, len);

    dr1= ctx->do_dr1;
    if(ret<0) mp_msg(MSGT_DECVIDEO,MSGL_WARN, "Error while decoding frame!\n");
//printf("repeat: %d\n", pic->repeat_pict);
//-- vstats generation
    while(lavc_param_vstats){ // always one time loop
        static FILE *fvstats=NULL;
        char filename[20];
        static long long int all_len=0;
        static int frame_number=0;
        static double all_frametime=0.0;
        AVFrame *pic= avctx->coded_frame;
	double quality=0.0;

        if(!fvstats) {
            time_t today2;
            struct tm *today;
            today2 = time(NULL);
            today = localtime(&today2);
            sprintf(filename, "vstats_%02d%02d%02d.log", today->tm_hour,
                today->tm_min, today->tm_sec);
            fvstats = fopen(filename,"w");
            if(!fvstats) {
                perror("fopen");
                lavc_param_vstats=0; // disable block
                break;
                /*exit(1);*/
            }
        }

	// average MB quantizer
	{
	    int x, y;
	    int w = ((avctx->width  << lavc_param_lowres)+15) >> 4;
	    int h = ((avctx->height << lavc_param_lowres)+15) >> 4;
	    int8_t *q = pic->qscale_table;
	    for( y = 0; y < h; y++ ) {
		for( x = 0; x < w; x++ )
		    quality += (double)*(q+x);
		q += pic->qstride;
	    }
	    quality /= w * h;
	}

        all_len+=len;
        all_frametime+=sh->frametime;
        fprintf(fvstats, "frame= %5d q= %2.2f f_size= %6d s_size= %8.0fkB ",
            ++frame_number, quality, len, (double)all_len/1024);
        fprintf(fvstats, "time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s ",
           all_frametime, (double)(len*8)/sh->frametime/1000.0,
           (double)(all_len*8)/all_frametime/1000.0);
	switch(pic->pict_type){
	case FF_I_TYPE:
            fprintf(fvstats, "type= I\n");
	    break;
	case FF_P_TYPE:
            fprintf(fvstats, "type= P\n");
	    break;
	case FF_S_TYPE:
            fprintf(fvstats, "type= S\n");
	    break;
	case FF_B_TYPE:
            fprintf(fvstats, "type= B\n");
	    break;
	default:
            fprintf(fvstats, "type= ? (%d)\n", pic->pict_type);
	    break;
	}
        
        ctx->qp_stat[(int)(quality+0.5)]++;
        ctx->qp_sum += quality;
        ctx->inv_qp_sum += 1.0/(double)quality;
        
        break;
    }
//--

    if(!got_picture) return NULL;	// skipped image

    if(init_vo(sh,avctx->pix_fmt) < 0) return NULL;

    if(dr1 && pic->opaque){
        mpi= (mp_image_t*)pic->opaque;
    }
        
    if(!mpi)
    mpi=mpcodecs_get_image(sh, MP_IMGTYPE_EXPORT, MP_IMGFLAG_PRESERVE,
	avctx->width, avctx->height);
    if(!mpi){	// temporary!
	mp_msg(MSGT_DECVIDEO, MSGL_WARN, MSGTR_MPCODECS_CouldntAllocateImageForCodec);
	return NULL;
    }
    
    if(!dr1){
        mpi->planes[0]=pic->data[0];
        mpi->planes[1]=pic->data[1];
        mpi->planes[2]=pic->data[2];
        mpi->stride[0]=pic->linesize[0];
        mpi->stride[1]=pic->linesize[1];
        mpi->stride[2]=pic->linesize[2];
    }
    
    if (!mpi->planes[0])
	return NULL;

    if(avctx->pix_fmt==PIX_FMT_YUV422P && mpi->chroma_y_shift==1){
	// we have 422p but user wants 420p
	mpi->stride[1]*=2;
	mpi->stride[2]*=2;
    }
    
#ifdef WORDS_BIGENDIAN
    // FIXME: this might cause problems for buffers with FF_BUFFER_HINTS_PRESERVE
    if (mpi->bpp == 8)
        swap_palette(mpi->planes[1]);
#endif
/* to comfirm with newer lavc style */
    mpi->qscale =pic->qscale_table;
    mpi->qstride=pic->qstride;
    mpi->pict_type=pic->pict_type;
    mpi->qscale_type= pic->qscale_type;
    mpi->fields = MP_IMGFIELD_ORDERED;
    if(pic->interlaced_frame) mpi->fields |= MP_IMGFIELD_INTERLACED;
    if(pic->top_field_first ) mpi->fields |= MP_IMGFIELD_TOP_FIRST;    
    if(pic->repeat_pict == 1) mpi->fields |= MP_IMGFIELD_REPEAT_FIRST;

    return mpi;
}

static enum PixelFormat get_format(struct AVCodecContext * avctx, 
                                    const enum PixelFormat * fmt){
sh_video_t * sh = avctx->opaque;
vd_ffmpeg_ctx *ctx = sh->context;
int i;

#ifdef HAVE_XVMC
    if(avctx->xvmc_acceleration){
        avctx->get_buffer= mc_get_buffer;
        avctx->release_buffer= mc_release_buffer;
        avctx->draw_horiz_band = mc_render_slice;
        mp_msg(MSGT_DECVIDEO, MSGL_INFO, MSGTR_MPCODECS_XVMCAcceleratedMPEG2);
        assert(ctx->do_dr1);//these are must to!
        assert(ctx->do_slices); //it is (vo_)ffmpeg bug if this fails
        avctx->flags|= CODEC_FLAG_EMU_EDGE;//do i need that??!!
        avctx->slice_flags=SLICE_FLAG_CODED_ORDER|SLICE_FLAG_ALLOW_FIELD;
    }
#endif
    for(i=0;fmt[i]!=-1;i++){
        mp_msg(MSGT_DECVIDEO, MSGL_INFO, MSGTR_MPCODECS_TryingPixfmt,i);
        if( init_vo(sh,fmt[i]) >= 0)
	    return fmt[i];
    }
    return fmt[0];
}

#ifdef HAVE_XVMC
static int mc_get_buffer(AVCodecContext *avctx, AVFrame *pic){
    sh_video_t * sh = avctx->opaque;
    vd_ffmpeg_ctx *ctx = sh->context;
    mp_image_t* mpi=NULL;
    xvmc_render_state_t * render;
    int flags= MP_IMGFLAG_ACCEPT_STRIDE | MP_IMGFLAG_PREFER_ALIGNED_STRIDE| 
               MP_IMGFLAG_DRAW_CALLBACK;
    
//  printf("vd_ffmpeg::mc_get_buffer (xvmc) %d %d %d\n", pic->reference, ctx->ip_count, ctx->b_count);
    if(!avctx->xvmc_acceleration){
        mp_msg(MSGT_DECVIDEO, MSGL_INFO, MSGTR_MPCODECS_McGetBufferShouldWorkOnlyWithXVMC);
        assert(0);
        exit(1);
//        return -1;//!!fixme check error conditions
    }
    assert(avctx->draw_horiz_band == mc_render_slice);
    assert(avctx->release_buffer == mc_release_buffer);
    if( mp_msg_test(MSGT_DECVIDEO,MSGL_DBG5) )
        mp_msg(MSGT_DECVIDEO, MSGL_DBG5, "vd_ffmpeg::mc_get_buffer\n");

    if(init_vo(sh,avctx->pix_fmt) < 0){
        mp_msg(MSGT_DECVIDEO, MSGL_WARN, MSGTR_MPCODECS_UnexpectedInitVoError);
        exit(1);
//        return -1;//!!fixme check error conditions
    }



    if(!pic->reference){
        ctx->b_count++;
    }else{
        ctx->ip_count++;
        flags|= MP_IMGFLAG_PRESERVE|MP_IMGFLAG_READABLE;
    }

    mpi= mpcodecs_get_image(sh, MP_IMGTYPE_IPB,flags ,
                            avctx->width, avctx->height);
    if(mpi==NULL){
        mp_msg(MSGT_DECVIDEO, MSGL_ERR, MSGTR_MPCODECS_UnrecoverableErrorRenderBuffersNotTaken);
        assert(0);
        exit(1);
//        return -1;//!!fixme check error conditions in ffmpeg
    };
    
    if( (mpi->flags & MP_IMGFLAG_DIRECT) == 0){
        mp_msg(MSGT_DECVIDEO, MSGL_ERR, MSGTR_MPCODECS_OnlyBuffersAllocatedByVoXvmcAllowed);
        assert(0);
        exit(1);
//        return -1;//!!fixme check error conditions in ffmpeg
    }
    
    pic->data[0]= mpi->planes[0];
    pic->data[1]= mpi->planes[1];
    pic->data[2]= mpi->planes[2];


    /* Note, some (many) codecs in libavcodec must have stride1==stride2 && no changes between frames
     * lavc will check that and die with an error message, if its not true
     */
    pic->linesize[0]= mpi->stride[0];
    pic->linesize[1]= mpi->stride[1];
    pic->linesize[2]= mpi->stride[2];

    pic->opaque = mpi;

    if(pic->reference){
    //I or P frame
        pic->age= ctx->ip_age[0];
        
        ctx->ip_age[0]= ctx->ip_age[1]+1;
        ctx->ip_age[1]= 1;
        ctx->b_age++;
    }else{
    //B frame
        pic->age= ctx->b_age;
    
        ctx->ip_age[0]++;
        ctx->ip_age[1]++;
        ctx->b_age=1;
    }

    pic->type= FF_BUFFER_TYPE_USER;

    render=(xvmc_render_state_t*)mpi->priv;//same as data[2]
    if( mp_msg_test(MSGT_DECVIDEO,MSGL_DBG5) )
        mp_msg(MSGT_DECVIDEO, MSGL_DBG5, "vd_ffmpeg::mc_get_buffer (render=%p)\n",render);
    assert(render != 0);
    assert(render->magic == MP_XVMC_RENDER_MAGIC);
    render->state |= MP_XVMC_STATE_PREDICTION;
    return 0;
}


static void mc_release_buffer(AVCodecContext *avctx, AVFrame *pic){
    mp_image_t* mpi= pic->opaque;
    sh_video_t * sh = avctx->opaque;
    vd_ffmpeg_ctx *ctx = sh->context;
    xvmc_render_state_t * render;
    int i;


    if(ctx->ip_count <= 2 && ctx->b_count<=1){
        if(mpi->flags&MP_IMGFLAG_PRESERVE)
            ctx->ip_count--;
        else
            ctx->b_count--;
    }

//printf("R%X %X\n", pic->linesize[0], pic->data[0]);
//mark the surface as not requared for prediction
    render=(xvmc_render_state_t*)pic->data[2];//same as mpi->priv
    if( mp_msg_test(MSGT_DECVIDEO,MSGL_DBG5) )
        mp_msg(MSGT_DECVIDEO, MSGL_DBG5, "vd_ffmpeg::mc_release_buffer (render=%p)\n",render);
    assert(render!=NULL);
    assert(render->magic==MP_XVMC_RENDER_MAGIC);
    render->state&=~MP_XVMC_STATE_PREDICTION;
    for(i=0; i<4; i++){
        pic->data[i]= NULL;
    }
}

static void mc_render_slice(struct AVCodecContext *s,
                	AVFrame *src, int offset[4],
                	int y, int type, int height){
int width= s->width;
sh_video_t * sh = s->opaque;
uint8_t *source[3]= {src->data[0], src->data[1], src->data[2]};
    
    assert(src->linesize[0]==0 && src->linesize[1]==0 && src->linesize[2]==0);
    assert(offset[0]==0 && offset[1]==0 && offset[2]==0);
    
    mpcodecs_draw_slice (sh, source, src->linesize, width, height, 0, y);

}

#endif // HAVE_XVMC
