mpeg4videodec: move MpegEncContext.time_increment_bits to Mpeg4DecContext

The field remains in MpegEncContext for use in the encoder.

libavcodec/mpeg4video.h

@@ -62,6 +62,8 @@
 typedef struct Mpeg4DecContext {
     MpegEncContext m;
 
+    ///< number of bits to represent the fractional part of time
+    int time_increment_bits;
     int shape;
 } Mpeg4DecContext;
 

libavcodec/mpeg4videodec.c

@@ -432,7 +432,7 @@ int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx)
             time_incr++;
 
         check_marker(&s->gb, "before time_increment in video packed header");
-        skip_bits(&s->gb, s->time_increment_bits);      /* time_increment */
+        skip_bits(&s->gb, ctx->time_increment_bits);      /* time_increment */
         check_marker(&s->gb, "before vop_coding_type in video packed header");
 
         skip_bits(&s->gb, 2); /* vop coding type */
@@ -1719,14 +1719,14 @@ static int decode_vol_header(Mpeg4DecContext *ctx, GetBitContext *gb)
         return -1;
     }
 
-    s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
-    if (s->time_increment_bits < 1)
-        s->time_increment_bits = 1;
+    ctx->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
+    if (ctx->time_increment_bits < 1)
+        ctx->time_increment_bits = 1;
 
     check_marker(gb, "before fixed_vop_rate");
 
     if (get_bits1(gb) != 0)     /* fixed_vop_rate  */
-        s->avctx->time_base.num = get_bits(gb, s->time_increment_bits);
+        s->avctx->time_base.num = get_bits(gb, ctx->time_increment_bits);
     else
         s->avctx->time_base.num = 1;
 
@@ -2065,31 +2065,31 @@ static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
 
     check_marker(gb, "before time_increment");
 
-    if (s->time_increment_bits == 0 ||
-        !(show_bits(gb, s->time_increment_bits + 1) & 1)) {
+    if (ctx->time_increment_bits == 0 ||
+        !(show_bits(gb, ctx->time_increment_bits + 1) & 1)) {
         av_log(s->avctx, AV_LOG_ERROR,
                "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
 
-        for (s->time_increment_bits = 1;
-             s->time_increment_bits < 16;
-             s->time_increment_bits++) {
+        for (ctx->time_increment_bits = 1;
+             ctx->time_increment_bits < 16;
+             ctx->time_increment_bits++) {
             if (s->pict_type == AV_PICTURE_TYPE_P ||
                 (s->pict_type == AV_PICTURE_TYPE_S &&
                  s->vol_sprite_usage == GMC_SPRITE)) {
-                if ((show_bits(gb, s->time_increment_bits + 6) & 0x37) == 0x30)
+                if ((show_bits(gb, ctx->time_increment_bits + 6) & 0x37) == 0x30)
                     break;
-            } else if ((show_bits(gb, s->time_increment_bits + 5) & 0x1F) == 0x18)
+            } else if ((show_bits(gb, ctx->time_increment_bits + 5) & 0x1F) == 0x18)
                 break;
         }
 
         av_log(s->avctx, AV_LOG_ERROR,
-               "my guess is %d bits ;)\n", s->time_increment_bits);
+               "my guess is %d bits ;)\n", ctx->time_increment_bits);
     }
 
     if (IS_3IV1)
         time_increment = get_bits1(gb);        // FIXME investigate further
     else
-        time_increment = get_bits(gb, s->time_increment_bits);
+        time_increment = get_bits(gb, ctx->time_increment_bits);
 
     if (s->pict_type != AV_PICTURE_TYPE_B) {
         s->last_time_base = s->time_base;
@@ -2413,7 +2413,8 @@ static int mpeg4_update_thread_context(AVCodecContext *dst,
     if (ret < 0)
         return ret;
 
-    s->shape = s1->shape;
+    s->shape               = s1->shape;
+    s->time_increment_bits = s1->time_increment_bits;
 
     return 0;
 }
@@ -2459,7 +2460,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
     s->h263_pred = 1;
     s->low_delay = 0; /* default, might be overriden in the vol header during header parsing */
     s->decode_mb = mpeg4_decode_mb;
-    s->time_increment_bits = 4; /* default value for broken headers */
+    ctx->time_increment_bits = 4; /* default value for broken headers */
 
     avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
     avctx->internal->allocate_progress = 1;

libavcodec/mpegvideo.c

@@ -716,9 +716,9 @@ do {\
     s->workaround_bugs      = s1->workaround_bugs;
 
     // MPEG4 timing info
-    memcpy(&s->time_increment_bits, &s1->time_increment_bits,
+    memcpy(&s->last_time_base, &s1->last_time_base,
            (char *) &s1->pb_field_time + sizeof(s1->pb_field_time) -
-           (char *) &s1->time_increment_bits);
+           (char *) &s1->last_time_base);
 
     // B-frame info
     s->max_b_frames = s1->max_b_frames;

libavcodec/mpegvideo.h

@@ -569,7 +569,8 @@ typedef struct MpegEncContext {
     int custom_pcf;
 
     /* mpeg4 specific */
-    int time_increment_bits;        ///< number of bits to represent the fractional part of time
+    ///< number of bits to represent the fractional part of time (encoder only)
+    int time_increment_bits;
     int last_time_base;
     int time_base;                  ///< time in seconds of last I,P,S Frame
     int64_t time;                   ///< time of current frame