path: root/libmpcodecs/vd_ffmpeg.c

/*
 * This file is part of MPlayer.
 *
 * MPlayer 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.
 *
 * MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

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

#include "talloc.h"
#include "config.h"
#include "mp_msg.h"
#include "options.h"
#include "av_opts.h"

#include "libavutil/common.h"
#include "ffmpeg_files/intreadwrite.h"
#include "mpbswap.h"
#include "fmt-conversion.h"

#include "vd.h"
#include "img_format.h"
#include "libmpdemux/stheader.h"
#include "codec-cfg.h"
#include "osdep/numcores.h"
#include "vd_ffmpeg.h"

static const vd_info_t info = {
    "FFmpeg's libavcodec codec family",
    "ffmpeg",
    "A'rpi",
    "A'rpi, Michael, Alex",
    "native codecs"
};

#include "libavcodec/avcodec.h"

#if AVPALETTE_SIZE > 1024
#error palette too large, adapt libmpcodecs/vf.c:vf_get_image
#endif

int avcodec_initialized=0;

typedef struct {
    AVCodecContext *avctx;
    AVFrame *pic;
    enum PixelFormat pix_fmt;
    int do_slices;
    int do_dr1;
    int vo_initialized;
    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;
    int lowres;
    enum AVDiscard skip_frame;
} vd_ffmpeg_ctx;

#include "m_option.h"

static int get_buffer(AVCodecContext *avctx, AVFrame *pic);
static void release_buffer(AVCodecContext *avctx, AVFrame *pic);
static void draw_slice(struct AVCodecContext *s, const AVFrame *src,
                       int offset[4], int y, int type, int height);

static enum PixelFormat get_format(struct AVCodecContext *avctx,
                                   const enum PixelFormat *pix_fmt);
static void uninit(struct sh_video *sh);

const m_option_t lavc_decode_opts_conf[]={
    OPT_INTRANGE("bug", lavc_param.workaround_bugs, 0, -1, 999999),
    OPT_INTRANGE("er", lavc_param.error_resilience, 0, 0, 99),
    OPT_FLAG_ON("gray", lavc_param.gray, 0),
    OPT_INTRANGE("idct", lavc_param.idct_algo, 0, 0, 99),
    OPT_INTRANGE("ec", lavc_param.error_concealment, 0, 0, 99),
    OPT_FLAG_ON("vstats", lavc_param.vstats, 0),
    OPT_INTRANGE("debug", lavc_param.debug, 0, 0, 9999999),
    OPT_INTRANGE("vismv", lavc_param.vismv, 0, 0, 9999999),
    OPT_INTRANGE("st", lavc_param.skip_top, 0, 0, 999),
    OPT_INTRANGE("sb", lavc_param.skip_bottom, 0, 0, 999),
    OPT_FLAG_CONSTANTS("fast", lavc_param.fast, 0, 0, CODEC_FLAG2_FAST),
    OPT_STRING("lowres", lavc_param.lowres_str, 0),
    OPT_STRING("skiploopfilter", lavc_param.skip_loop_filter_str, 0),
    OPT_STRING("skipidct", lavc_param.skip_idct_str, 0),
    OPT_STRING("skipframe", lavc_param.skip_frame_str, 0),
    OPT_INTRANGE("threads", lavc_param.threads, 0, 0, 16),
    OPT_FLAG_CONSTANTS("bitexact", lavc_param.bitexact, 0, 0, CODEC_FLAG_BITEXACT),
    OPT_STRING("o", lavc_param.avopt, 0),
    {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(ctx->best_csp == IMGFMT_YV12) return CONTROL_TRUE;// u/v swap
            if(ctx->best_csp == IMGFMT_422P && !ctx->do_dr1) return CONTROL_TRUE;// half stride
            break;
        }
        return CONTROL_FALSE;
    }
    case VDCTRL_RESYNC_STREAM:
        avcodec_flush_buffers(avctx);
        return CONTROL_TRUE;
    case VDCTRL_QUERY_UNSEEN_FRAMES:;
        int delay = avctx->has_b_frames;
        return delay + 10;
    }
    return CONTROL_UNKNOWN;
}

void init_avcodec(void)
{
    if (!avcodec_initialized) {
        avcodec_init();
        avcodec_register_all();
        avcodec_initialized = 1;
    }
}

// init driver
static int init(sh_video_t *sh){
    struct lavc_param *lavc_param = &sh->opts->lavc_param;
    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));

    init_avcodec();

    ctx = sh->context = talloc_zero(NULL, vd_ffmpeg_ctx);

    lavc_codec = avcodec_find_decoder_by_name(sh->codec->dll);
    if(!lavc_codec){
        mp_tmsg(MSGT_DECVIDEO, MSGL_ERR, "Cannot find codec '%s' in libavcodec...\n", sh->codec->dll);
        uninit(sh);
        return 0;
    }

    if(sh->opts->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
       && lavc_codec->id != CODEC_ID_ROQ && lavc_codec->id != CODEC_ID_VP8
#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(52, 108, 0)
       && lavc_codec->id != CODEC_ID_LAGARITH
#endif
       )
        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;
    avctx->opaque = sh;
    avctx->codec_type = AVMEDIA_TYPE_VIDEO;
    avctx->codec_id = lavc_codec->id;

    if (lavc_codec->capabilities & CODEC_CAP_HWACCEL   // XvMC
        || lavc_codec->capabilities & CODEC_CAP_HWACCEL_VDPAU) {
        ctx->do_dr1    = true;
        ctx->do_slices = true;
        lavc_param->threads    = 1;
        avctx->get_format      = get_format;
        avctx->get_buffer      = get_buffer;
        avctx->release_buffer  = release_buffer;
        avctx->reget_buffer    = get_buffer;
        avctx->draw_horiz_band = draw_slice;
        if (lavc_codec->capabilities & CODEC_CAP_HWACCEL)
            mp_msg(MSGT_DECVIDEO, MSGL_V, "[VD_FFMPEG] XVMC-accelerated "
                   "MPEG-2.\n");
        if (lavc_codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)
            mp_msg(MSGT_DECVIDEO, MSGL_V, "[VD_FFMPEG] VDPAU hardware "
                   "decoding.\n");
        avctx->slice_flags = SLICE_FLAG_CODED_ORDER|SLICE_FLAG_ALLOW_FIELD;
    }

    if (lavc_param->threads == 0) {
        int threads = default_thread_count();
        if (threads < 1) {
            mp_msg(MSGT_DECVIDEO, MSGL_WARN, "[VD_FFMPEG] Could not determine "
                   "thread count to use, defaulting to 1.\n");
            threads = 1;
        }
        threads = FFMIN(threads, 16);
        lavc_param->threads = threads;
    }
    /* Our get_buffer and draw_horiz_band callbacks are not safe to call
     * from other threads. */
    if (lavc_param->threads > 1) {
        ctx->do_dr1 = false;
        ctx->do_slices = false;
        mp_tmsg(MSGT_DECVIDEO, MSGL_INFO, "Asking decoder to use "
                "%d threads if supported.\n", lavc_param->threads);
    }

    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;
    }

    avctx->flags|= lavc_param->bitexact;

    avctx->coded_width = sh->disp_w;
    avctx->coded_height= sh->disp_h;
    avctx->workaround_bugs= lavc_param->workaround_bugs;
    avctx->error_recognition= lavc_param->error_resilience;
    if(lavc_param->gray) avctx->flags|= CODEC_FLAG_GRAY;
    avctx->flags2|= lavc_param->fast;
    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", &ctx->lowres, &lowres_w);
        if(ctx->lowres < 1 || ctx->lowres > 16 || (lowres_w > 0 && avctx->width < lowres_w))
            ctx->lowres = 0;
        avctx->lowres = ctx->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);

    if(lavc_param->avopt){
        if(parse_avopts(avctx, lavc_param->avopt) < 0){
            mp_msg(MSGT_DECVIDEO, MSGL_ERR, "Your options /%s/ look like gibberish to me pal\n", lavc_param->avopt);
            uninit(sh);
            return 0;
        }
    }

    // Do this after the above avopt handling in case it changes values
    ctx->skip_frame = avctx->skip_frame;

    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(*sh->bih))
            break;
        avctx->flags |= CODEC_FLAG_EXTERN_HUFF;
        avctx->extradata_size = sh->bih->biSize-sizeof(*sh->bih);
        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(*sh->bih);
            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(*sh->bih))
            break;
        avctx->extradata_size = sh->bih->biSize-sizeof(*sh->bih);
        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(*sh->bih))
            /* Palette size in biSize */
            memcpy(avctx->palctrl->palette, sh->bih+1,
                   FFMIN(sh->bih->biSize-sizeof(*sh->bih), 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_coded_sample= sh->bih->biBitCount;

    if(lavc_param->threads > 1) {
        avctx->thread_count = lavc_param->threads;
        avcodec_thread_init(avctx, lavc_param->threads);
    }
    /* open it */
    if (avcodec_open(avctx, lavc_codec) < 0) {
        mp_tmsg(MSGT_DECVIDEO, MSGL_ERR, "Could not open codec.\n");
        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 (sh->opts->lavc_param.vstats && avctx->coded_frame) {
        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_tmsg(MSGT_DECVIDEO, MSGL_INFO, "[VD_FFMPEG] Arithmetic mean of QP: %2.4f, Harmonic mean of QP: %2.4f\n",
            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_tmsg(MSGT_DECVIDEO, MSGL_ERR, "Could not close codec.\n");

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

    av_freep(&avctx);
    av_freep(&ctx->pic);
    talloc_free(ctx);
}

static void draw_slice(struct AVCodecContext *s,
                       const AVFrame *src, int offset[4],
                       int y, int type, int height){
    sh_video_t *sh = s->opaque;
    uint8_t *source[MP_MAX_PLANES]= {src->data[0] + offset[0], src->data[1] + offset[1], src->data[2] + offset[2]};
    int strides[MP_MAX_PLANES] = {src->linesize[0], src->linesize[1], src->linesize[2]};
#if 0
    int start=0, i;
    int width= s->width;
    vd_ffmpeg_ctx *ctx = sh->context;
    int skip_stride= ((width << ctx->lowres)+15)>>4;
    uint8_t *skip= &s->coded_frame->mbskip_table[(y>>4)*skip_stride];
    int threshold= s->coded_frame->age;
    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 (height < 0)
    {
        int i;
        height = -height;
        y -= height;
        for (i = 0; i < MP_MAX_PLANES; i++)
        {
            strides[i] = -strides[i];
            source[i] -= strides[i];
        }
    }
    if (y < sh->disp_h) {
        height = FFMIN(height, sh->disp_h-y);
        mpcodecs_draw_slice (sh, source, strides, sh->disp_w, height, 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 >> ctx->lowres;
        height = sh->bih->biHeight >> ctx->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_initialized)
    {
        ctx->vo_initialized = 0;
        mp_msg(MSGT_DECVIDEO, MSGL_V, "[ffmpeg] aspect_ratio: %f\n", aspect);

        // Do not overwrite s->aspect on the first call, so that a container
        // aspect if available is preferred.
        // But set it even if the sample aspect did not change, since a
        // resolution change can cause an aspect change even if the
        // _sample_ aspect is unchanged.
        if (sh->aspect == 0 || ctx->last_sample_aspect_ratio.den)
            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;
        ctx->best_csp = pixfmt2imgfmt(pix_fmt);
        const unsigned int *supported_fmts;
        if (ctx->best_csp == IMGFMT_YV12)
            supported_fmts = (const unsigned int[])
                {IMGFMT_YV12, IMGFMT_I420, IMGFMT_IYUV, 0xffffffff};
        else if (ctx->best_csp == IMGFMT_422P)
            supported_fmts = (const unsigned int[])
                {IMGFMT_422P, IMGFMT_YV12, IMGFMT_I420, IMGFMT_IYUV,
                 0xffffffff};
        else
            supported_fmts = (const unsigned int[]){ctx->best_csp, 0xffffffff};
        if (!mpcodecs_config_vo2(sh, sh->disp_w, sh->disp_h, supported_fmts,
                                 ctx->best_csp))
            return -1;
        ctx->vo_initialized = 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_ALIGNED_STRIDE | MP_IMGFLAG_PREFER_ALIGNED_STRIDE;
    int type= MP_IMGTYPE_IPB;
    int width= avctx->width;
    int height= avctx->height;
    // special case to handle reget_buffer without buffer hints
    if (pic->opaque && pic->data[0] && !pic->buffer_hints)
        return 0;
    avcodec_align_dimensions(avctx, &width, &height);
//printf("get_buffer %d %d %d\n", pic->reference, ctx->ip_count, ctx->b_count);

    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 |= 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 |= 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;
        avctx->reget_buffer= avcodec_default_reget_buffer;
        if (pic->data[0])
            release_buffer(avctx, pic);
        return avctx->get_buffer(avctx, pic);
    }

    if (IMGFMT_IS_HWACCEL(ctx->best_csp)) {
        type =  MP_IMGTYPE_NUMBERED | (0xffff << 16);
    } else
    if (!pic->buffer_hints) {
        if(ctx->b_count>1 || ctx->ip_count>2){
            mp_tmsg(MSGT_DECVIDEO, MSGL_WARN, "[VD_FFMPEG] DRI failure.\n");

            ctx->do_dr1=0; //FIXME
            avctx->get_buffer= avcodec_default_get_buffer;
            avctx->reget_buffer= avcodec_default_reget_buffer;
            if (pic->data[0])
                release_buffer(avctx, pic);
            return avctx->get_buffer(avctx, pic);
        }

        if(avctx->has_b_frames || ctx->b_count){
            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");
    }

    if (ctx->best_csp == IMGFMT_RGB8 || ctx->best_csp == IMGFMT_BGR8)
        flags |= MP_IMGFLAG_RGB_PALETTE;
    mpi= mpcodecs_get_image(sh, type, flags, width, height);
    if (!mpi) return -1;

    // 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;
    if(IMGFMT_IS_HWACCEL(mpi->imgfmt)) {
        avctx->draw_horiz_band= draw_slice;
    }

    pic->data[0]= mpi->planes[0];
    pic->data[1]= mpi->planes[1];
    pic->data[2]= mpi->planes[2];
    pic->data[3]= mpi->planes[3];

#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->linesize[3]= mpi->stride[3];

    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;

    /* The libavcodec reordered_opaque functionality is implemented by
     * a similar copy in avcodec_default_get_buffer() and without a
     * workaround like this it'd stop working when a custom buffer
     * callback is used.
     */
    pic->reordered_opaque = avctx->reordered_opaque;
    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--;
    }

    if (mpi) {
        // Palette support: free palette buffer allocated in get_buffer
        if (mpi->bpp == 8)
            av_freep(&mpi->planes[1]);
        // release mpi (in case MPI_IMGTYPE_NUMBERED is used, e.g. for VDPAU)
        mpi->usage_count--;
    }

    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;

static av_unused 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 struct mp_image *decode(struct sh_video *sh, void *data, int len,
                               int flags, double *reordered_pts)
{
    int got_picture=0;
    int ret;
    vd_ffmpeg_ctx *ctx = sh->context;
    AVFrame *pic= ctx->pic;
    AVCodecContext *avctx = ctx->avctx;
    struct lavc_param *lavc_param = &sh->opts->lavc_param;
    mp_image_t *mpi=NULL;
    int dr1= ctx->do_dr1;
    AVPacket pkt;

    if(len<=0) r