avformat/aviobuf: check if requested seekback buffer is already read

[ffmpeg] / libavcodec / truemotion2.c

diff --git a/libavcodec/truemotion2.c b/libavcodec/truemotion2.c
index fbdb657363b249e0437e88f079adfb3255932813..a1d4eea340035abf5d1a830f47eb54a53f52db7f 100644 (file)
--- a/libavcodec/truemotion2.c
+++ b/libavcodec/truemotion2.c
@@ -155,7 +155,7 @@ static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)
     huff.val_bits = get_bits(&ctx->gb, 5);
     huff.max_bits = get_bits(&ctx->gb, 5);
     huff.min_bits = get_bits(&ctx->gb, 5);
-    huff.nodes    = get_bits_long(&ctx->gb, 17);
+    huff.nodes    = get_bits(&ctx->gb, 17);
     huff.num      = 0;
 
     /* check for correct codes parameters */
@@ -200,8 +200,6 @@ static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)
 
     /* convert codes to vlc_table */
     if (res >= 0) {
-        int i;
-
         res = init_vlc(&code->vlc, huff.max_bits, huff.max_num,
                        huff.lens, sizeof(int), sizeof(int),
                        huff.bits, sizeof(uint32_t), sizeof(uint32_t), 0);
@@ -210,13 +208,8 @@ static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)
         else {
             code->bits = huff.max_bits;
             code->length = huff.max_num;
-            code->recode = av_malloc_array(code->length, sizeof(int));
-            if (!code->recode) {
-                res = AVERROR(ENOMEM);
-                goto out;
-            }
-            for (i = 0; i < code->length; i++)
-                code->recode[i] = huff.nums[i];
+            code->recode = huff.nums;
+            huff.nums = NULL;
         }
     }
 
@@ -586,10 +579,10 @@ static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int
         last[0] = (int)((unsigned)last[1]  - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
     last[2] = (int)((unsigned)last[1] + last[3]) >> 1;
 
-    t1 = ctx->D[0] + ctx->D[1];
+    t1 = ctx->D[0] + (unsigned)ctx->D[1];
     ctx->D[0] = t1 >> 1;
     ctx->D[1] = t1 - (t1 >> 1);
-    t2 = ctx->D[2] + ctx->D[3];
+    t2 = ctx->D[2] + (unsigned)ctx->D[3];
     ctx->D[2] = t2 >> 1;
     ctx->D[3] = t2 - (t2 >> 1);