Merge commit 'ee8af2dd99dcb7a01a667deedec81d1aa2a00d72'
[ffmpeg.git] / libavcodec / mpeg4videodec.c
index 6fee6a4..be07410 100644 (file)
@@ -3,23 +3,26 @@
  * Copyright (c) 2000,2001 Fabrice Bellard
  * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
  *
- * This file is part of Libav.
+ * This file is part of FFmpeg.
  *
- * Libav is free software; you can redistribute it and/or
+ * 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.
  *
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#define UNCHECKED_BITSTREAM_READER 1
+
+#include "libavutil/opt.h"
 #include "error_resilience.h"
 #include "internal.h"
 #include "mpegvideo.h"
@@ -111,7 +114,7 @@ static inline int mpeg4_is_resync(MpegEncContext *s)
     int bits_count = get_bits_count(&s->gb);
     int v          = show_bits(&s->gb, 16);
 
-    if (s->workaround_bugs & FF_BUG_NO_PADDING)
+    if (s->workaround_bugs & FF_BUG_NO_PADDING && !s->resync_marker)
         return 0;
 
     while (v <= 0xFF) {
@@ -128,10 +131,11 @@ static inline int mpeg4_is_resync(MpegEncContext *s)
         v  |= 0x7F >> (7 - (bits_count & 7));
 
         if (v == 0x7F)
-            return 1;
+            return s->mb_num;
     } else {
         if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
-            int len;
+            int len, mb_num;
+            int mb_num_bits = av_log2(s->mb_num - 1) + 1;
             GetBitContext gb = s->gb;
 
             skip_bits(&s->gb, 1);
@@ -141,10 +145,14 @@ static inline int mpeg4_is_resync(MpegEncContext *s)
                 if (get_bits1(&s->gb))
                     break;
 
+            mb_num = get_bits(&s->gb, mb_num_bits);
+            if (!mb_num || mb_num > s->mb_num || get_bits_count(&s->gb)+6 > s->gb.size_in_bits)
+                mb_num= -1;
+
             s->gb = gb;
 
             if (len >= ff_mpeg4_get_video_packet_prefix_length(s))
-                return 1;
+                return mb_num;
         }
     }
     return 0;
@@ -364,6 +372,17 @@ static int mpeg4_decode_sprite_trajectory(MpegEncContext *s, GetBitContext *gb)
     return 0;
 }
 
+static int decode_new_pred(MpegEncContext *s, GetBitContext *gb) {
+    int len = FFMIN(s->time_increment_bits + 3, 15);
+
+    get_bits(gb, len);
+    if (get_bits1(gb))
+        get_bits(gb, len);
+    check_marker(gb, "after new_pred");
+
+    return 0;
+}
+
 /**
  * Decode the next video packet.
  * @return <0 if something went wrong
@@ -399,19 +418,6 @@ int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
                "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
         return -1;
     }
-    if (s->pict_type == AV_PICTURE_TYPE_B) {
-        int mb_x = 0, mb_y = 0;
-
-        while (s->next_picture.mbskip_table[s->mb_index2xy[mb_num]]) {
-            if (!mb_x)
-                ff_thread_await_progress(&s->next_picture_ptr->tf, mb_y++, 0);
-            mb_num++;
-            if (++mb_x == s->mb_width)
-                mb_x = 0;
-        }
-        if (mb_num >= s->mb_num)
-            return -1;  // slice contains just skipped MBs (already decoded)
-    }
 
     s->mb_x = mb_num % s->mb_width;
     s->mb_y = mb_num / s->mb_width;
@@ -464,7 +470,8 @@ int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
             }
         }
     }
-    // FIXME new-pred stuff
+    if (s->new_pred)
+        decode_new_pred(s, &s->gb);
 
     return 0;
 }
@@ -558,7 +565,7 @@ static inline int mpeg4_decode_dc(MpegEncContext *s, int n, int *dir_ptr)
 
         if (code > 8) {
             if (get_bits1(&s->gb) == 0) { /* marker */
-                if (s->err_recognition & AV_EF_BITSTREAM) {
+                if (s->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT)) {
                     av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
                     return -1;
                 }
@@ -924,7 +931,8 @@ int ff_mpeg4_decode_partitions(MpegEncContext *s)
 static inline int mpeg4_decode_block(MpegEncContext *s, int16_t *block,
                                      int n, int coded, int intra, int rvlc)
 {
-    int level, i, last, run, qmul, qadd, dc_pred_dir;
+    int level, i, last, run, qmul, qadd;
+    int av_uninit(dc_pred_dir);
     RLTable *rl;
     RL_VLC_ELEM *rl_vlc;
     const uint8_t *scan_table;
@@ -1085,13 +1093,35 @@ static inline int mpeg4_decode_block(MpegEncContext *s, int16_t *block,
                                 SKIP_COUNTER(re, &s->gb, 1 + 12 + 1);
                             }
 
+#if 0
+                            if (s->error_recognition >= FF_ER_COMPLIANT) {
+                                const int abs_level= FFABS(level);
+                                if (abs_level<=MAX_LEVEL && run<=MAX_RUN) {
+                                    const int run1= run - rl->max_run[last][abs_level] - 1;
+                                    if (abs_level <= rl->max_level[last][run]) {
+                                        av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
+                                        return -1;
+                                    }
+                                    if (s->error_recognition > FF_ER_COMPLIANT) {
+                                        if (abs_level <= rl->max_level[last][run]*2) {
+                                            av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
+                                            return -1;
+                                        }
+                                        if (run1 >= 0 && abs_level <= rl->max_level[last][run1]) {
+                                            av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
+                                            return -1;
+                                        }
+                                    }
+                                }
+                            }
+#endif
                             if (level > 0)
                                 level = level * qmul + qadd;
                             else
                                 level = level * qmul - qadd;
 
                             if ((unsigned)(level + 2048) > 4095) {
-                                if (s->err_recognition & AV_EF_BITSTREAM) {
+                                if (s->err_recognition & (AV_EF_BITSTREAM|AV_EF_AGGRESSIVE)) {
                                     if (level > 2560 || level < -2560) {
                                         av_log(s->avctx, AV_LOG_ERROR,
                                                "|level| overflow in 3. esc, qp=%d\n",
@@ -1256,7 +1286,7 @@ static int mpeg4_decode_mb(MpegEncContext *s, int16_t block[6][64])
     static int8_t quant_tab[4] = { -1, -2, 1, 2 };
     const int xy = s->mb_x + s->mb_y * s->mb_stride;
 
-    assert(s->h263_pred);
+    av_assert2(s->h263_pred);
 
     if (s->pict_type == AV_PICTURE_TYPE_P ||
         s->pict_type == AV_PICTURE_TYPE_S) {
@@ -1598,20 +1628,23 @@ intra:
 end:
     /* per-MB end of slice check */
     if (s->codec_id == AV_CODEC_ID_MPEG4) {
-        if (mpeg4_is_resync(s)) {
-            const int delta = s->mb_x + 1 == s->mb_width ? 2 : 1;
+        int next = mpeg4_is_resync(s);
+        if (next) {
+            if        (s->mb_x + s->mb_y*s->mb_width + 1 >  next && (s->avctx->err_recognition & AV_EF_AGGRESSIVE)) {
+                return -1;
+            } else if (s->mb_x + s->mb_y*s->mb_width + 1 >= next)
+                return SLICE_END;
 
-            if (s->pict_type == AV_PICTURE_TYPE_B &&
-                s->next_picture.mbskip_table[xy + delta]) {
+            if (s->pict_type == AV_PICTURE_TYPE_B) {
+                const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
                 ff_thread_await_progress(&s->next_picture_ptr->tf,
                                          (s->mb_x + delta >= s->mb_width)
                                          ? FFMIN(s->mb_y + 1, s->mb_height - 1)
                                          : s->mb_y, 0);
+                if (s->next_picture.mbskip_table[xy + delta])
+                    return SLICE_OK;
             }
 
-            if (s->pict_type == AV_PICTURE_TYPE_B &&
-                s->next_picture.mbskip_table[xy + delta])
-                return SLICE_OK;
             return SLICE_END;
         }
     }
@@ -1622,29 +1655,30 @@ end:
 static int mpeg4_decode_gop_header(MpegEncContext *s, GetBitContext *gb)
 {
     int hours, minutes, seconds;
-    unsigned time_code = show_bits(gb, 18);
-
-    if (time_code & 0x40) {     /* marker_bit */
-        hours   = time_code >> 13;
-        minutes = time_code >> 7 & 0x3f;
-        seconds = time_code & 0x3f;
-        s->time_base = seconds + 60 * (minutes + 60 * hours);
-        skip_bits(gb, 20);      /* time_code, closed_gov, broken_link */
-    } else {
-        av_log(s->avctx, AV_LOG_WARNING, "GOP header missing marker_bit\n");
+
+    if (!show_bits(gb, 23)) {
+        av_log(s->avctx, AV_LOG_WARNING, "GOP header invalid\n");
+        return -1;
     }
 
+    hours   = get_bits(gb, 5);
+    minutes = get_bits(gb, 6);
+    skip_bits1(gb);
+    seconds = get_bits(gb, 6);
+
+    s->time_base = seconds + 60*(minutes + 60*hours);
+
+    skip_bits1(gb);
+    skip_bits1(gb);
+
     return 0;
 }
 
 static int mpeg4_decode_profile_level(MpegEncContext *s, GetBitContext *gb)
 {
-    int profile_and_level_indication;
 
-    profile_and_level_indication = get_bits(gb, 8);
-
-    s->avctx->profile = (profile_and_level_indication & 0xf0) >> 4;
-    s->avctx->level   = (profile_and_level_indication & 0x0f);
+    s->avctx->profile = get_bits(gb, 4);
+    s->avctx->level   = get_bits(gb, 4);
 
     // for Simple profile, level 0
     if (s->avctx->profile == 0 && s->avctx->level == 8) {
@@ -1734,11 +1768,11 @@ static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
 
     if (ctx->shape != BIN_ONLY_SHAPE) {
         if (ctx->shape == RECT_SHAPE) {
-            skip_bits1(gb);   /* marker */
+            check_marker(gb, "before width");
             width = get_bits(gb, 13);
-            skip_bits1(gb);   /* marker */
+            check_marker(gb, "before height");
             height = get_bits(gb, 13);
-            skip_bits1(gb);   /* marker */
+            check_marker(gb, "after height");
             if (width && height &&  /* they should be non zero but who knows */
                 !(s->width && s->codec_tag == AV_RL32("MP4S"))) {
                 if (s->width && s->height &&
@@ -1796,6 +1830,9 @@ static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
             if (s->quant_precision != 5)
                 av_log(s->avctx, AV_LOG_ERROR,
                        "quant precision %d\n", s->quant_precision);
+            if (s->quant_precision<3 || s->quant_precision>9) {
+                s->quant_precision = 5;
+            }
         } else {
             s->quant_precision = 5;
         }
@@ -1980,6 +2017,17 @@ no_cplx_est:
         }
     }
 
+    if (s->avctx->debug&FF_DEBUG_PICT_INFO) {
+        av_log(s->avctx, AV_LOG_DEBUG, "tb %d/%d, tincrbits:%d, qp_prec:%d, ps:%d,  %s%s%s%s\n",
+               s->avctx->time_base.num, s->avctx->time_base.den,
+               s->time_increment_bits,
+               s->quant_precision,
+               s->progressive_sequence,
+               s->scalability ? "scalability " :"" , s->quarter_sample ? "qpel " : "",
+               s->data_partitioning ? "partition " : "", s->rvlc ? "rvlc " : ""
+        );
+    }
+
     return 0;
 }
 
@@ -2011,8 +2059,9 @@ static int decode_user_data(MpegEncContext *s, GetBitContext *gb)
         s->divx_build   = build;
         s->divx_packed  = e == 3 && last == 'p';
         if (s->divx_packed && !s->showed_packed_warning) {
-            av_log(s->avctx, AV_LOG_WARNING,
-                   "Invalid and inefficient vfw-avi packed B frames detected\n");
+            av_log(s->avctx, AV_LOG_INFO, "Video uses a non-standard and "
+                   "wasteful way to store B-frames ('packed B-frames'). "
+                   "Consider using a tool like VirtualDub or avidemux to fix it.\n");
             s->showed_packed_warning = 1;
         }
     }
@@ -2045,6 +2094,7 @@ static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
 {
     MpegEncContext *s = &ctx->m;
     int time_incr, time_increment;
+    int64_t pts;
 
     s->pict_type = get_bits(gb, 2) + AV_PICTURE_TYPE_I;        /* pict type: I = 0 , P = 1 */
     if (s->pict_type == AV_PICTURE_TYPE_B && s->low_delay &&
@@ -2084,6 +2134,9 @@ static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
 
         av_log(s->avctx, AV_LOG_ERROR,
                "my guess is %d bits ;)\n", s->time_increment_bits);
+        if (s->avctx->time_base.den && 4*s->avctx->time_base.den < 1<<s->time_increment_bits) {
+            s->avctx->time_base.den = 1<<s->time_increment_bits;
+        }
     }
 
     if (IS_3IV1)
@@ -2130,6 +2183,14 @@ static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
         }
     }
 
+    if (s->avctx->time_base.num)
+        pts = ROUNDED_DIV(s->time, s->avctx->time_base.num);
+    else
+        pts = AV_NOPTS_VALUE;
+    if (s->avctx->debug&FF_DEBUG_PTS)
+        av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n",
+               pts);
+
     check_marker(gb, "before vop_coded");
 
     /* vop coded */
@@ -2138,6 +2199,9 @@ static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
             av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
         return FRAME_SKIPPED;
     }
+    if (s->new_pred)
+        decode_new_pred(s, gb);
+
     if (ctx->shape != BIN_ONLY_SHAPE &&
                     (s->pict_type == AV_PICTURE_TYPE_P ||
                      (s->pict_type == AV_PICTURE_TYPE_S &&
@@ -2174,6 +2238,10 @@ static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
         if (s->pict_type == AV_PICTURE_TYPE_B)
             skip_bits_long(gb, s->cplx_estimation_trash_b);
 
+        if (get_bits_left(gb) < 3) {
+            av_log(s->avctx, AV_LOG_ERROR, "Header truncated\n");
+            return -1;
+        }
         s->intra_dc_threshold = ff_mpeg4_dc_threshold[get_bits(gb, 3)];
         if (!s->progressive_sequence) {
             s->top_field_first = get_bits1(gb);
@@ -2219,6 +2287,7 @@ static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
             if (s->f_code == 0) {
                 av_log(s->avctx, AV_LOG_ERROR,
                        "Error, header damaged or not MPEG4 header (f_code=0)\n");
+                s->f_code = 1;
                 return -1;  // makes no sense to continue, as there is nothing left from the image then
             }
         } else
@@ -2226,22 +2295,31 @@ static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
 
         if (s->pict_type == AV_PICTURE_TYPE_B) {
             s->b_code = get_bits(gb, 3);
+            if (s->b_code == 0) {
+                av_log(s->avctx, AV_LOG_ERROR,
+                       "Error, header damaged or not MPEG4 header (b_code=0)\n");
+                s->b_code=1;
+                return -1; // makes no sense to continue, as the MV decoding will break very quickly
+            }
         } else
             s->b_code = 1;
 
         if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
             av_log(s->avctx, AV_LOG_DEBUG,
-                   "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d\n",
+                   "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d time:%"PRId64" tincr:%d\n",
                    s->qscale, s->f_code, s->b_code,
                    s->pict_type == AV_PICTURE_TYPE_I ? "I" : (s->pict_type == AV_PICTURE_TYPE_P ? "P" : (s->pict_type == AV_PICTURE_TYPE_B ? "B" : "S")),
-                   gb->size_in_bits, s->progressive_sequence, s->alternate_scan,
+                   gb->size_in_bits,s->progressive_sequence, s->alternate_scan,
                    s->top_field_first, s->quarter_sample ? "q" : "h",
                    s->data_partitioning, s->resync_marker,
                    s->num_sprite_warping_points, s->sprite_warping_accuracy,
                    1 - s->no_rounding, s->vo_type,
                    s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold,
                    s->cplx_estimation_trash_i, s->cplx_estimation_trash_p,
-                   s->cplx_estimation_trash_b);
+                   s->cplx_estimation_trash_b,
+                   s->time,
+                   time_increment
+                  );
         }
 
         if (!s->scalability) {
@@ -2304,8 +2382,8 @@ int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb)
     for (;;) {
         if (get_bits_count(gb) >= gb->size_in_bits) {
             if (gb->size_in_bits == 8 &&
-                (s->divx_version >= 0 || s->xvid_build >= 0)) {
-                av_log(s->avctx, AV_LOG_WARNING, "frame skip %d\n", gb->size_in_bits);
+                (s->divx_version >= 0 || s->xvid_build >= 0) || s->codec_tag == AV_RL32("QMP4")) {
+                av_log(s->avctx, AV_LOG_VERBOSE, "frame skip %d\n", gb->size_in_bits);
                 return FRAME_SKIPPED;  // divx bug
             } else
                 return -1;  // end of stream
@@ -2402,6 +2480,32 @@ end:
     return decode_vop_header(ctx, gb);
 }
 
+av_cold void ff_mpeg4videodec_static_init(void) {
+    static int done = 0;
+
+    if (!done) {
+        ff_init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
+        ff_init_rl(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
+        ff_init_rl(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
+        INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
+        INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
+        INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
+        INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
+                        &ff_mpeg4_DCtab_lum[0][1], 2, 1,
+                        &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
+        INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
+                        &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
+                        &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
+        INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
+                        &ff_sprite_trajectory_tab[0][1], 4, 2,
+                        &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
+        INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
+                        &ff_mb_type_b_tab[0][1], 2, 1,
+                        &ff_mb_type_b_tab[0][0], 2, 1, 16);
+        done = 1;
+    }
+}
+
 static int mpeg4_update_thread_context(AVCodecContext *dst,
                                        const AVCodecContext *src)
 {
@@ -2423,7 +2527,6 @@ static av_cold int decode_init(AVCodecContext *avctx)
     Mpeg4DecContext *ctx = avctx->priv_data;
     MpegEncContext *s = &ctx->m;
     int ret;
-    static int done = 0;
 
     s->divx_version =
     s->divx_build   =
@@ -2433,31 +2536,10 @@ static av_cold int decode_init(AVCodecContext *avctx)
     if ((ret = ff_h263_decode_init(avctx)) < 0)
         return ret;
 
-    if (!done) {
-        done = 1;
-
-        ff_init_rl(&ff_mpeg4_rl_intra, ff_mpeg4_static_rl_table_store[0]);
-        ff_init_rl(&ff_rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
-        ff_init_rl(&ff_rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
-        INIT_VLC_RL(ff_mpeg4_rl_intra, 554);
-        INIT_VLC_RL(ff_rvlc_rl_inter, 1072);
-        INIT_VLC_RL(ff_rvlc_rl_intra, 1072);
-        INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
-                        &ff_mpeg4_DCtab_lum[0][1], 2, 1,
-                        &ff_mpeg4_DCtab_lum[0][0], 2, 1, 512);
-        INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
-                        &ff_mpeg4_DCtab_chrom[0][1], 2, 1,
-                        &ff_mpeg4_DCtab_chrom[0][0], 2, 1, 512);
-        INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
-                        &ff_sprite_trajectory_tab[0][1], 4, 2,
-                        &ff_sprite_trajectory_tab[0][0], 4, 2, 128);
-        INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
-                        &ff_mb_type_b_tab[0][1], 2, 1,
-                        &ff_mb_type_b_tab[0][0], 2, 1, 16);
-    }
+    ff_mpeg4videodec_static_init();
 
     s->h263_pred = 1;
-    s->low_delay = 0; /* default, might be overriden in the vol header during header parsing */
+    s->low_delay = 0; /* default, might be overridden in the vol header during header parsing */
     s->decode_mb = mpeg4_decode_mb;
     s->time_increment_bits = 4; /* default value for broken headers */
 
@@ -2484,6 +2566,27 @@ static const AVProfile mpeg4_video_profiles[] = {
     { FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE, "Advanced Scalable Texture Profile" },
     { FF_PROFILE_MPEG4_SIMPLE_STUDIO,             "Simple Studio Profile" },
     { FF_PROFILE_MPEG4_ADVANCED_SIMPLE,           "Advanced Simple Profile" },
+    { FF_PROFILE_UNKNOWN },
+};
+
+static const AVOption mpeg4_options[] = {
+    {"quarter_sample", "1/4 subpel MC", offsetof(MpegEncContext, quarter_sample), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
+    {"divx_packed", "divx style packed b frames", offsetof(MpegEncContext, divx_packed), FF_OPT_TYPE_INT, {.i64 = 0}, 0, 1, 0},
+    {NULL}
+};
+
+static const AVClass mpeg4_class = {
+    "MPEG4 Video Decoder",
+    av_default_item_name,
+    mpeg4_options,
+    LIBAVUTIL_VERSION_INT,
+};
+
+static const AVClass mpeg4_vdpau_class = {
+    "MPEG4 Video VDPAU Decoder",
+    av_default_item_name,
+    mpeg4_options,
+    LIBAVUTIL_VERSION_INT,
 };
 
 AVCodec ff_mpeg4_decoder = {
@@ -2499,7 +2602,28 @@ AVCodec ff_mpeg4_decoder = {
                              CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
                              CODEC_CAP_FRAME_THREADS,
     .flush                 = ff_mpeg_flush,
+    .max_lowres            = 3,
     .pix_fmts              = ff_h263_hwaccel_pixfmt_list_420,
     .profiles              = NULL_IF_CONFIG_SMALL(mpeg4_video_profiles),
     .update_thread_context = ONLY_IF_THREADS_ENABLED(mpeg4_update_thread_context),
+    .priv_class = &mpeg4_class,
+};
+
+
+#if CONFIG_MPEG4_VDPAU_DECODER
+AVCodec ff_mpeg4_vdpau_decoder = {
+    .name           = "mpeg4_vdpau",
+    .long_name      = NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_MPEG4,
+    .priv_data_size = sizeof(MpegEncContext),
+    .init           = decode_init,
+    .close          = ff_h263_decode_end,
+    .decode         = ff_h263_decode_frame,
+    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY |
+                      CODEC_CAP_HWACCEL_VDPAU,
+    .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_VDPAU_MPEG4,
+                                                  AV_PIX_FMT_NONE },
+    .priv_class     = &mpeg4_vdpau_class,
 };
+#endif