/*

  * RV10/RV20 decoder

  * Copyright (c) 2000,2001 Fabrice Bellard

  * Copyright (c) 2002-2004 Michael Niedermayer

  *

  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either

  * version 2.1 of the License, or (at your option) any later version.

  *

  * FFmpeg 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
  * Lesser General Public License for more details.

  *

  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */

 
 /**

  * @file

  * RV10/RV20 decoder

  */

 #include <inttypes.h>
 

 #include "libavutil/imgutils.h"

 #include "avcodec.h"

 #include "error_resilience.h"

 #include "h263.h"

 #include "h263data.h"

 #include "internal.h"

 #include "mpeg_er.h"

 #include "mpegutils.h"

 #include "mpegvideo.h"

 #include "mpeg4video.h"

 #include "mpegvideodata.h"

 #include "rv10.h"

 #define RV_GET_MAJOR_VER(x)  ((x) >> 28)
 #define RV_GET_MINOR_VER(x) (((x) >> 20) & 0xFF)
 #define RV_GET_MICRO_VER(x) (((x) >> 12) & 0xFF)
 

 #define DC_VLC_BITS 14 // FIXME find a better solution

 typedef struct RVDecContext {
     MpegEncContext m;
     int sub_id;

     int orig_width, orig_height;

 } RVDecContext;
 

 static const uint16_t rv_lum_code[256] = {
     0x3e7f, 0x0f00, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05, 0x0f06,
     0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,
     0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16,
     0x0f17, 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e,
     0x0f1f, 0x0f20, 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26,
     0x0f27, 0x0f28, 0x0f29, 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e,
     0x0f2f, 0x0f30, 0x0f31, 0x0f32, 0x0f33, 0x0f34, 0x0f35, 0x0f36,
     0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b, 0x0f3c, 0x0f3d, 0x0f3e,
     0x0f3f, 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386,
     0x0387, 0x0388, 0x0389, 0x038a, 0x038b, 0x038c, 0x038d, 0x038e,
     0x038f, 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,
     0x0397, 0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e,
     0x039f, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6,
     0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,
     0x00cf, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056,
     0x0057, 0x0020, 0x0021, 0x0022, 0x0023, 0x000c, 0x000d, 0x0004,
     0x0000, 0x0005, 0x000e, 0x000f, 0x0024, 0x0025, 0x0026, 0x0027,
     0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
     0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
     0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
     0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7,
     0x03a8, 0x03a9, 0x03aa, 0x03ab, 0x03ac, 0x03ad, 0x03ae, 0x03af,
     0x03b0, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7,
     0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf,
     0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44, 0x0f45, 0x0f46, 0x0f47,
     0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d, 0x0f4e, 0x0f4f,
     0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56, 0x0f57,
     0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,
     0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67,
     0x0f68, 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f,
     0x0f70, 0x0f71, 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77,
     0x0f78, 0x0f79, 0x0f7a, 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f,

 };
 

 static const uint8_t rv_lum_bits[256] = {
     14, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 10, 10, 10, 10, 10, 10, 10,
     10, 10, 10, 10, 10, 10, 10, 10,
     10, 10, 10, 10, 10, 10, 10, 10,
     10, 10, 10, 10, 10, 10, 10, 10,
     10,  8,  8,  8,  8,  8,  8,  8,
      8,  8,  8,  8,  8,  8,  8,  8,
      8,  7,  7,  7,  7,  7,  7,  7,
      7,  6,  6,  6,  6,  5,  5,  4,
      2,  4,  5,  5,  6,  6,  6,  6,
      7,  7,  7,  7,  7,  7,  7,  7,
      8,  8,  8,  8,  8,  8,  8,  8,
      8,  8,  8,  8,  8,  8,  8,  8,
     10, 10, 10, 10, 10, 10, 10, 10,
     10, 10, 10, 10, 10, 10, 10, 10,
     10, 10, 10, 10, 10, 10, 10, 10,
     10, 10, 10, 10, 10, 10, 10, 10,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,

 };
 

 static const uint16_t rv_chrom_code[256] = {
     0xfe7f, 0x3f00, 0x3f01, 0x3f02, 0x3f03, 0x3f04, 0x3f05, 0x3f06,
     0x3f07, 0x3f08, 0x3f09, 0x3f0a, 0x3f0b, 0x3f0c, 0x3f0d, 0x3f0e,
     0x3f0f, 0x3f10, 0x3f11, 0x3f12, 0x3f13, 0x3f14, 0x3f15, 0x3f16,
     0x3f17, 0x3f18, 0x3f19, 0x3f1a, 0x3f1b, 0x3f1c, 0x3f1d, 0x3f1e,
     0x3f1f, 0x3f20, 0x3f21, 0x3f22, 0x3f23, 0x3f24, 0x3f25, 0x3f26,
     0x3f27, 0x3f28, 0x3f29, 0x3f2a, 0x3f2b, 0x3f2c, 0x3f2d, 0x3f2e,
     0x3f2f, 0x3f30, 0x3f31, 0x3f32, 0x3f33, 0x3f34, 0x3f35, 0x3f36,
     0x3f37, 0x3f38, 0x3f39, 0x3f3a, 0x3f3b, 0x3f3c, 0x3f3d, 0x3f3e,
     0x3f3f, 0x0f80, 0x0f81, 0x0f82, 0x0f83, 0x0f84, 0x0f85, 0x0f86,
     0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c, 0x0f8d, 0x0f8e,
     0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95, 0x0f96,
     0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,
     0x0f9f, 0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6,
     0x03c7, 0x03c8, 0x03c9, 0x03ca, 0x03cb, 0x03cc, 0x03cd, 0x03ce,
     0x03cf, 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6,
     0x00e7, 0x0030, 0x0031, 0x0032, 0x0033, 0x0008, 0x0009, 0x0002,
     0x0000, 0x0003, 0x000a, 0x000b, 0x0034, 0x0035, 0x0036, 0x0037,
     0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
     0x03d0, 0x03d1, 0x03d2, 0x03d3, 0x03d4, 0x03d5, 0x03d6, 0x03d7,
     0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df,
     0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,
     0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf,
     0x0fb0, 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7,
     0x0fb8, 0x0fb9, 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf,
     0x3f40, 0x3f41, 0x3f42, 0x3f43, 0x3f44, 0x3f45, 0x3f46, 0x3f47,
     0x3f48, 0x3f49, 0x3f4a, 0x3f4b, 0x3f4c, 0x3f4d, 0x3f4e, 0x3f4f,
     0x3f50, 0x3f51, 0x3f52, 0x3f53, 0x3f54, 0x3f55, 0x3f56, 0x3f57,
     0x3f58, 0x3f59, 0x3f5a, 0x3f5b, 0x3f5c, 0x3f5d, 0x3f5e, 0x3f5f,
     0x3f60, 0x3f61, 0x3f62, 0x3f63, 0x3f64, 0x3f65, 0x3f66, 0x3f67,
     0x3f68, 0x3f69, 0x3f6a, 0x3f6b, 0x3f6c, 0x3f6d, 0x3f6e, 0x3f6f,
     0x3f70, 0x3f71, 0x3f72, 0x3f73, 0x3f74, 0x3f75, 0x3f76, 0x3f77,
     0x3f78, 0x3f79, 0x3f7a, 0x3f7b, 0x3f7c, 0x3f7d, 0x3f7e, 0x3f7f,

 };
 

 static const uint8_t rv_chrom_bits[256] = {
     16, 14, 14, 14, 14, 14, 14, 14,
     14, 14, 14, 14, 14, 14, 14, 14,
     14, 14, 14, 14, 14, 14, 14, 14,
     14, 14, 14, 14, 14, 14, 14, 14,
     14, 14, 14, 14, 14, 14, 14, 14,
     14, 14, 14, 14, 14, 14, 14, 14,
     14, 14, 14, 14, 14, 14, 14, 14,
     14, 14, 14, 14, 14, 14, 14, 14,
     14, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 10, 10, 10, 10, 10, 10, 10,
     10, 10, 10, 10, 10, 10, 10, 10,
     10,  8,  8,  8,  8,  8,  8,  8,
      8,  6,  6,  6,  6,  4,  4,  3,
      2,  3,  4,  4,  6,  6,  6,  6,
      8,  8,  8,  8,  8,  8,  8,  8,
     10, 10, 10, 10, 10, 10, 10, 10,
     10, 10, 10, 10, 10, 10, 10, 10,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     12, 12, 12, 12, 12, 12, 12, 12,
     14, 14, 14, 14, 14, 14, 14, 14,
     14, 14, 14, 14, 14, 14, 14, 14,
     14, 14, 14, 14, 14, 14, 14, 14,
     14, 14, 14, 14, 14, 14, 14, 14,
     14, 14, 14, 14, 14, 14, 14, 14,
     14, 14, 14, 14, 14, 14, 14, 14,
     14, 14, 14, 14, 14, 14, 14, 14,
     14, 14, 14, 14, 14, 14, 14, 14,

 };
 
 static VLC rv_dc_lum, rv_dc_chrom;
 

 int ff_rv_decode_dc(MpegEncContext *s, int n)

 {
     int code;
 
     if (n < 4) {

         code = get_vlc2(&s->gb, rv_dc_lum.table, DC_VLC_BITS, 2);

         if (code < 0) {
             /* XXX: I don't understand why they use LONGER codes than

              * necessary. The following code would be completely useless
              * if they had thought about it !!! */

             code = get_bits(&s->gb, 7);
             if (code == 0x7c) {

                 code = (int8_t) (get_bits(&s->gb, 7) + 1);

             } else if (code == 0x7d) {
                 code = -128 + get_bits(&s->gb, 7);
             } else if (code == 0x7e) {

                 if (get_bits1(&s->gb) == 0)

                     code = (int8_t) (get_bits(&s->gb, 8) + 1);

                 else

                     code = (int8_t) (get_bits(&s->gb, 8));

             } else if (code == 0x7f) {

                 skip_bits(&s->gb, 11);

                 code = 1;
             }
         } else {
             code -= 128;
         }
     } else {

         code = get_vlc2(&s->gb, rv_dc_chrom.table, DC_VLC_BITS, 2);

         /* same remark */
         if (code < 0) {
             code = get_bits(&s->gb, 9);
             if (code == 0x1fc) {

                 code = (int8_t) (get_bits(&s->gb, 7) + 1);

             } else if (code == 0x1fd) {
                 code = -128 + get_bits(&s->gb, 7);
             } else if (code == 0x1fe) {

                 skip_bits(&s->gb, 9);

                 code = 1;
             } else {

                 av_log(s->avctx, AV_LOG_ERROR, "chroma dc error\n");

                 return 0xffff;
             }
         } else {
             code -= 128;
         }
     }
     return -code;
 }
 
 /* read RV 1.0 compatible frame header */
 static int rv10_decode_picture_header(MpegEncContext *s)
 {

     int mb_count, pb_frame, marker, mb_xy;

     marker = get_bits1(&s->gb);

     if (get_bits1(&s->gb))

         s->pict_type = AV_PICTURE_TYPE_P;

     else

         s->pict_type = AV_PICTURE_TYPE_I;

 
     if (!marker)
         av_log(s->avctx, AV_LOG_ERROR, "marker missing\n");
 

     pb_frame = get_bits1(&s->gb);

     ff_dlog(s->avctx, "pict_type=%d pb_frame=%d\n", s->pict_type, pb_frame);

     if (pb_frame) {

         avpriv_request_sample(s->avctx, "PB-frame");

         return AVERROR_PATCHWELCOME;

     }

 
     s->qscale = get_bits(&s->gb, 5);

     if (s->qscale == 0) {

         av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
         return AVERROR_INVALIDDATA;

     }

     if (s->pict_type == AV_PICTURE_TYPE_I) {

         if (s->rv10_version == 3) {
             /* specific MPEG like DC coding not used */
             s->last_dc[0] = get_bits(&s->gb, 8);
             s->last_dc[1] = get_bits(&s->gb, 8);
             s->last_dc[2] = get_bits(&s->gb, 8);

             ff_dlog(s->avctx, "DC:%d %d %d\n", s->last_dc[0],

                     s->last_dc[1], s->last_dc[2]);

         }
     }
     /* if multiple packets per frame are sent, the position at which

      * to display the macroblocks is coded here */

     mb_xy = s->mb_x + s->mb_y * s->mb_width;
     if (show_bits(&s->gb, 12) == 0 || (mb_xy && mb_xy < s->mb_num)) {
         s->mb_x  = get_bits(&s->gb, 6); /* mb_x */
         s->mb_y  = get_bits(&s->gb, 6); /* mb_y */

         mb_count = get_bits(&s->gb, 12);
     } else {

         s->mb_x  = 0;
         s->mb_y  = 0;

         mb_count = s->mb_width * s->mb_height;
     }

     skip_bits(&s->gb, 3);   /* ignored */

     s->f_code          = 1;

     s->unrestricted_mv = 1;

     return mb_count;
 }
 

 static int rv20_decode_picture_header(RVDecContext *rv)

 {

     MpegEncContext *s = &rv->m;

     int seq, mb_pos, i, ret;

     int rpr_max;

     i = get_bits(&s->gb, 2);
     switch (i) {

     case 0:
         s->pict_type = AV_PICTURE_TYPE_I;
         break;
     case 1:
         s->pict_type = AV_PICTURE_TYPE_I;
         break;                                  // hmm ...
     case 2:
         s->pict_type = AV_PICTURE_TYPE_P;
         break;
     case 3:
         s->pict_type = AV_PICTURE_TYPE_B;
         break;

     default:

         av_log(s->avctx, AV_LOG_ERROR, "unknown frame type\n");

         return AVERROR_INVALIDDATA;

     }

     if (s->low_delay && s->pict_type == AV_PICTURE_TYPE_B) {

         av_log(s->avctx, AV_LOG_ERROR, "low delay B\n");
         return -1;
     }

     if (!s->last_picture_ptr && s->pict_type == AV_PICTURE_TYPE_B) {

         av_log(s->avctx, AV_LOG_ERROR, "early B-frame\n");
         return AVERROR_INVALIDDATA;

     }

     if (get_bits1(&s->gb)) {

         av_log(s->avctx, AV_LOG_ERROR, "reserved bit set\n");

         return AVERROR_INVALIDDATA;

     }
 
     s->qscale = get_bits(&s->gb, 5);

     if (s->qscale == 0) {

         av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
         return AVERROR_INVALIDDATA;

     }

     if (RV_GET_MINOR_VER(rv->sub_id) >= 2)

         s->loop_filter = get_bits1(&s->gb) && !s->avctx->lowres;

     if (RV_GET_MINOR_VER(rv->sub_id) <= 1)

         seq = get_bits(&s->gb, 8) << 7;
     else
         seq = get_bits(&s->gb, 13) << 2;
 

     rpr_max = s->avctx->extradata[1] & 7;
     if (rpr_max) {

         int f, new_w, new_h;

         int rpr_bits = av_log2(rpr_max) + 1;

         f = get_bits(&s->gb, rpr_bits);

         if (f) {

             if (s->avctx->extradata_size < 8 + 2 * f) {
                 av_log(s->avctx, AV_LOG_ERROR, "Extradata too small.\n");
                 return AVERROR_INVALIDDATA;
             }
 

             new_w = 4 * ((uint8_t *) s->avctx->extradata)[6 + 2 * f];
             new_h = 4 * ((uint8_t *) s->avctx->extradata)[7 + 2 * f];

         } else {

             new_w = rv->orig_width;
             new_h = rv->orig_height;

         }

         if (new_w != s->width || new_h != s->height) {

             AVRational old_aspect = s->avctx->sample_aspect_ratio;

             av_log(s->avctx, AV_LOG_DEBUG,
                    "attempting to change resolution to %dx%d\n", new_w, new_h);

             if (av_image_check_size(new_w, new_h, 0, s->avctx) < 0)
                 return AVERROR_INVALIDDATA;

             ff_mpv_common_end(s);

 
             // attempt to keep aspect during typical resolution switches
             if (!old_aspect.num)
                 old_aspect = (AVRational){1, 1};
             if (2 * new_w * s->height == new_h * s->width)
                 s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){2, 1});
             if (new_w * s->height == 2 * new_h * s->width)
                 s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){1, 2});

             ret = ff_set_dimensions(s->avctx, new_w, new_h);
             if (ret < 0)
                 return ret;
 

             s->width  = new_w;
             s->height = new_h;

             if ((ret = ff_mpv_common_init(s)) < 0)

                 return ret;

         }

         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {

             av_log(s->avctx, AV_LOG_DEBUG, "F %d/%d/%d\n", f, rpr_bits, rpr_max);

         }

     }
     if (av_image_check_size(s->width, s->height, 0, s->avctx) < 0)

         return AVERROR_INVALIDDATA;

     mb_pos = ff_h263_decode_mba(s);
 

     seq |= s->time & ~0x7FFF;
     if (seq - s->time >  0x4000)
         seq -= 0x8000;
     if (seq - s->time < -0x4000)
         seq += 0x8000;
 
     if (seq != s->time) {
         if (s->pict_type != AV_PICTURE_TYPE_B) {
             s->time            = seq;
             s->pp_time         = s->time - s->last_non_b_time;
             s->last_non_b_time = s->time;
         } else {
             s->time    = seq;
             s->pb_time = s->pp_time - (s->last_non_b_time - s->time);

         }
     }

     if (s->pict_type == AV_PICTURE_TYPE_B) {
         if (s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0) {
             av_log(s->avctx, AV_LOG_DEBUG,

                    "messed up order, possible from seeking? skipping current B-frame\n");

 #define ERROR_SKIP_FRAME -123
             return ERROR_SKIP_FRAME;

         }
         ff_mpeg4_init_direct_mv(s);
     }

     s->no_rounding = get_bits1(&s->gb);

     if (RV_GET_MINOR_VER(rv->sub_id) <= 1 && s->pict_type == AV_PICTURE_TYPE_B)

         // binary decoder reads 3+2 bits here but they don't seem to be used
         skip_bits(&s->gb, 5);

     s->f_code          = 1;

     s->unrestricted_mv = 1;

     s->h263_aic        = s->pict_type == AV_PICTURE_TYPE_I;
     s->modified_quant  = 1;

     if (!s->avctx->lowres)
         s->loop_filter = 1;

 
     if (s->avctx->debug & FF_DEBUG_PICT_INFO) {

         av_log(s->avctx, AV_LOG_INFO,
                "num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n",
                seq, s->mb_x, s->mb_y, s->pict_type, s->qscale,
                s->no_rounding);

     }
 

     av_assert0(s->pict_type != AV_PICTURE_TYPE_B || !s->low_delay);

     return s->mb_width * s->mb_height - mb_pos;

 }
 

 static av_cold int rv10_decode_init(AVCodecContext *avctx)

 {

     RVDecContext *rv = avctx->priv_data;

     MpegEncContext *s = &rv->m;

     static int done = 0;

     int major_ver, minor_ver, micro_ver, ret;

     if (avctx->extradata_size < 8) {
         av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");

         return AVERROR_INVALIDDATA;

     }

     if ((ret = av_image_check_size(avctx->coded_width,
                                    avctx->coded_height, 0, avctx)) < 0)
         return ret;

     ff_mpv_decode_defaults(s);

     ff_mpv_decode_init(s, avctx);

     s->out_format  = FMT_H263;

     rv->orig_width  =
     s->width        = avctx->coded_width;
     rv->orig_height =
     s->height       = avctx->coded_height;

     s->h263_long_vectors = ((uint8_t *) avctx->extradata)[3] & 1;
     rv->sub_id           = AV_RB32((uint8_t *) avctx->extradata + 4);

     major_ver = RV_GET_MAJOR_VER(rv->sub_id);
     minor_ver = RV_GET_MINOR_VER(rv->sub_id);
     micro_ver = RV_GET_MICRO_VER(rv->sub_id);

 
     s->low_delay = 1;
     switch (major_ver) {
     case 1:
         s->rv10_version = micro_ver ? 3 : 1;

         s->obmc         = micro_ver == 2;

         break;
     case 2:
         if (minor_ver >= 2) {

             s->low_delay           = 0;

             s->avctx->has_b_frames = 1;
         }
         break;
     default:

         av_log(s->avctx, AV_LOG_ERROR, "unknown header %X\n", rv->sub_id);

         avpriv_request_sample(avctx, "RV1/2 version");

         return AVERROR_PATCHWELCOME;
     }

     if (avctx->debug & FF_DEBUG_PICT_INFO) {

         av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%"PRIX32"\n", rv->sub_id,

                ((uint32_t *) avctx->extradata)[0]);

     }

     avctx->pix_fmt = AV_PIX_FMT_YUV420P;

     ff_mpv_idct_init(s);

     if ((ret = ff_mpv_common_init(s)) < 0)

         return ret;

     ff_h263dsp_init(&s->h263dsp);

     ff_h263_decode_init_vlc();

 
     /* init rv vlc */
     if (!done) {

         INIT_VLC_STATIC(&rv_dc_lum, DC_VLC_BITS, 256,

                         rv_lum_bits, 1, 1,
                         rv_lum_code, 2, 2, 16384);

         INIT_VLC_STATIC(&rv_dc_chrom, DC_VLC_BITS, 256,

                         rv_chrom_bits, 1, 1,
                         rv_chrom_code, 2, 2, 16388);

         done = 1;
     }
 
     return 0;
 }
 

 static av_cold int rv10_decode_end(AVCodecContext *avctx)

 {
     MpegEncContext *s = avctx->priv_data;
 

     ff_mpv_common_end(s);

     return 0;
 }
 

 static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf,
                               int buf_size, int buf_size2)

 {

     RVDecContext *rv = avctx->priv_data;

     MpegEncContext *s = &rv->m;

     int mb_count, mb_pos, left, start_mb_x, active_bits_size, ret;

     active_bits_size = buf_size * 8;
     init_get_bits(&s->gb, buf, FFMAX(buf_size, buf_size2) * 8);

     if (s->codec_id == AV_CODEC_ID_RV10)

         mb_count = rv10_decode_picture_header(s);
     else

         mb_count = rv20_decode_picture_header(rv);

     if (mb_count < 0) {

         if (mb_count != ERROR_SKIP_FRAME)
             av_log(s->avctx, AV_LOG_ERROR, "HEADER ERROR\n");

         return AVERROR_INVALIDDATA;

     }

     if (s->mb_x >= s->mb_width ||
         s->mb_y >= s->mb_height) {

         av_log(s->avctx, AV_LOG_ERROR, "POS ERROR %d %d\n", s->mb_x, s->mb_y);

         return AVERROR_INVALIDDATA;

     }
     mb_pos = s->mb_y * s->mb_width + s->mb_x;

     left   = s->mb_width * s->mb_height - mb_pos;

     if (mb_count > left) {

         av_log(s->avctx, AV_LOG_ERROR, "COUNT ERROR\n");

         return AVERROR_INVALIDDATA;

     }
 

     if ((s->mb_x == 0 && s->mb_y == 0) || !s->current_picture_ptr) {

         // FIXME write parser so we always have complete frames?
         if (s->current_picture_ptr) {

             ff_er_frame_end(&s->er);

             ff_mpv_frame_end(s);

             s->mb_x = s->mb_y = s->resync_mb_x = s->resync_mb_y = 0;

         }

         if ((ret = ff_mpv_frame_start(s, avctx)) < 0)

             return ret;

         ff_mpeg_er_frame_start(s);

     } else {

         if (s->current_picture_ptr->f->pict_type != s->pict_type) {

             av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");

             return AVERROR_INVALIDDATA;

         }

     }
 

     ff_dlog(avctx, "qscale=%d\n", s->qscale);

 
     /* default quantization values */

     if (s->codec_id == AV_CODEC_ID_RV10) {
         if (s->mb_y == 0)
             s->first_slice_line = 1;
     } else {
         s->first_slice_line = 1;
         s->resync_mb_x      = s->mb_x;

     }

     start_mb_x     = s->mb_x;
     s->resync_mb_y = s->mb_y;
     if (s->h263_aic) {

         s->y_dc_scale_table =
         s->c_dc_scale_table = ff_aic_dc_scale_table;

     } else {

         s->y_dc_scale_table =
         s->c_dc_scale_table = ff_mpeg1_dc_scale_table;

     }

     if (s->modified_quant)
         s->chroma_qscale_table = ff_h263_chroma_qscale_table;

     ff_set_qscale(s, s->qscale);

     s->rv10_first_dc_coded[0] = 0;
     s->rv10_first_dc_coded[1] = 0;
     s->rv10_first_dc_coded[2] = 0;

     s->block_wrap[0] =
     s->block_wrap[1] =
     s->block_wrap[2] =
     s->block_wrap[3] = s->b8_stride;
     s->block_wrap[4] =
     s->block_wrap[5] = s->mb_stride;

     ff_init_block_index(s);

     /* decode each macroblock */
     for (s->mb_num_left = mb_count; s->mb_num_left > 0; s->mb_num_left--) {

         int ret;

         ff_update_block_index(s);

         ff_tlog(avctx, "**mb x=%d y=%d\n", s->mb_x, s->mb_y);

         s->mv_dir  = MV_DIR_FORWARD;

         s->mv_type = MV_TYPE_16X16;

         ret = ff_h263_decode_mb(s, s->block);

         // Repeat the slice end check from ff_h263_decode_mb with our active
         // bitstream size
         if (ret != SLICE_ERROR) {
             int v = show_bits(&s->gb, 16);
 
             if (get_bits_count(&s->gb) + 16 > active_bits_size)
                 v >>= get_bits_count(&s->gb) + 16 - active_bits_size;
 
             if (!v)
                 ret = SLICE_END;
         }
         if (ret != SLICE_ERROR && active_bits_size < get_bits_count(&s->gb) &&
             8 * buf_size2 >= get_bits_count(&s->gb)) {
             active_bits_size = buf_size2 * 8;
             av_log(avctx, AV_LOG_DEBUG, "update size from %d to %d\n",
                    8 * buf_size, active_bits_size);

             ret = SLICE_OK;

         }
 

         if (ret == SLICE_ERROR || active_bits_size < get_bits_count(&s->gb)) {

             av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x,
                    s->mb_y);

             return AVERROR_INVALIDDATA;

         }

         if (s->pict_type != AV_PICTURE_TYPE_B)

             ff_h263_update_motion_val(s);

         ff_mpv_reconstruct_mb(s, s->block);

         if (s->loop_filter)

             ff_h263_loop_filter(s);
 

         if (++s->mb_x == s->mb_width) {
             s->mb_x = 0;
             s->mb_y++;

             ff_init_block_index(s);

         }

         if (s->mb_x == s->resync_mb_x)
             s->first_slice_line = 0;
         if (ret == SLICE_END)
             break;

     }
 

     ff_er_add_slice(&s->er, start_mb_x, s->resync_mb_y, s->mb_x - 1, s->mb_y,

                     ER_MB_END);

     return active_bits_size;

 }
 

 static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)

 {

     if (avctx->slice_count)
         return avctx->slice_offset[n];
     else
         return AV_RL32(buf + n * 8);

 }
 

 static int rv10_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,

                              AVPacket *avpkt)

 {

     const uint8_t *buf = avpkt->data;

     int buf_size       = avpkt->size;

     MpegEncContext *s = avctx->priv_data;
     AVFrame *pict = data;

     int i, ret;

     int slice_count;

     const uint8_t *slices_hdr = NULL;

     ff_dlog(avctx, "*****frame %d size=%d\n", avctx->frame_number, buf_size);

 
     /* no supplementary picture */
     if (buf_size == 0) {
         return 0;
     }

     if (!avctx->slice_count) {

         slice_count = (*buf++) + 1;

         buf_size--;

 
         if (!slice_count || buf_size <= 8 * slice_count) {

             av_log(avctx, AV_LOG_ERROR, "Invalid slice count: %d.\n",
                    slice_count);

             return AVERROR_INVALIDDATA;
         }
 

         slices_hdr = buf + 4;

         buf       += 8 * slice_count;
         buf_size  -= 8 * slice_count;
     } else

         slice_count = avctx->slice_count;
 

     for (i = 0; i < slice_count; i++) {

         unsigned offset = get_slice_offset(avctx, slices_hdr, i);

         int size, size2;

         if (offset >= buf_size)
             return AVERROR_INVALIDDATA;
 

         if (i + 1 == slice_count)
             size = buf_size - offset;

         else

             size = get_slice_offset(avctx, slices_hdr, i + 1) - offset;

         if (i + 2 >= slice_count)
             size2 = buf_size - offset;

         else

             size2 = get_slice_offset(avctx, slices_hdr, i + 2) - offset;

         if (size <= 0 || size2 <= 0 ||
             offset + FFMAX(size, size2) > buf_size)
             return AVERROR_INVALIDDATA;
 

         if ((ret = rv10_decode_packet(avctx, buf + offset, size, size2)) < 0)
             return ret;
 
         if (ret > 8 * size)

             i++;

     }

     if (s->current_picture_ptr && s->mb_y >= s->mb_height) {

         ff_er_frame_end(&s->er);

         ff_mpv_frame_end(s);

         if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {

             if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)

                 return ret;

             ff_print_debug_info(s, s->current_picture_ptr, pict);

             ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);

         } else if (s->last_picture_ptr) {

             if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)

                 return ret;

             ff_print_debug_info(s, s->last_picture_ptr, pict);

             ff_mpv_export_qp_table(s, pict,s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);

         }

         if (s->last_picture_ptr || s->low_delay) {

             *got_frame = 1;

         }

 
         // so we can detect if frame_end was not called (find some nicer solution...)
         s->current_picture_ptr = NULL;

     }

     return avpkt->size;

 }
 

 AVCodec ff_rv10_decoder = {

     .name           = "rv10",

     .long_name      = NULL_IF_CONFIG_SMALL("RealVideo 1.0"),

     .type           = AVMEDIA_TYPE_VIDEO,

     .id             = AV_CODEC_ID_RV10,

     .priv_data_size = sizeof(RVDecContext),

     .init           = rv10_decode_init,
     .close          = rv10_decode_end,
     .decode         = rv10_decode_frame,

     .capabilities   = AV_CODEC_CAP_DR1,

     .max_lowres     = 3,

     .pix_fmts       = (const enum AVPixelFormat[]) {
         AV_PIX_FMT_YUV420P,
         AV_PIX_FMT_NONE
     },

 };

 AVCodec ff_rv20_decoder = {

     .name           = "rv20",

     .long_name      = NULL_IF_CONFIG_SMALL("RealVideo 2.0"),

     .type           = AVMEDIA_TYPE_VIDEO,

     .id             = AV_CODEC_ID_RV20,

     .priv_data_size = sizeof(RVDecContext),

     .init           = rv10_decode_init,
     .close          = rv10_decode_end,
     .decode         = rv10_decode_frame,

     .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,

     .flush          = ff_mpeg_flush,

     .max_lowres     = 3,

     .pix_fmts       = (const enum AVPixelFormat[]) {
         AV_PIX_FMT_YUV420P,
         AV_PIX_FMT_NONE
     },

 };