Merge commit '827a05eaa9482e9ac2a17f7f2e42ead07c1d7574'

[ffmpeg] / libavcodec / utvideodec.c

diff --git a/libavcodec/utvideodec.c b/libavcodec/utvideodec.c
index 815b71cfb661fad490f033efd317d753727657f3..40c12772b34e4a3ae8be1b10f87ff46b282bff07 100644 (file)
--- a/libavcodec/utvideodec.c
+++ b/libavcodec/utvideodec.c
@@ -27,6 +27,8 @@
 #include <inttypes.h>
 #include <stdlib.h>
 
+#define UNCHECKED_BITSTREAM_READER 1
+
 #include "libavutil/intreadwrite.h"
 #include "avcodec.h"
 #include "bswapdsp.h"
@@ -73,8 +75,8 @@ static int build_huff10(const uint8_t *src, VLC *vlc, int *fsym)
         syms[i]  = he[i].sym;
         code += 0x80000000u >> (he[i].len - 1);
     }
-
-    return ff_init_vlc_sparse(vlc, FFMIN(he[last].len, 11), last + 1,
+#define VLC_BITS 11
+    return ff_init_vlc_sparse(vlc, VLC_BITS, last + 1,
                               bits,  sizeof(*bits),  sizeof(*bits),
                               codes, sizeof(*codes), sizeof(*codes),
                               syms,  sizeof(*syms),  sizeof(*syms), 0);
@@ -117,7 +119,7 @@ static int build_huff(const uint8_t *src, VLC *vlc, int *fsym)
         code += 0x80000000u >> (he[i].len - 1);
     }
 
-    return ff_init_vlc_sparse(vlc, FFMIN(he[last].len, 11), last + 1,
+    return ff_init_vlc_sparse(vlc, VLC_BITS, last + 1,
                               bits,  sizeof(*bits),  sizeof(*bits),
                               codes, sizeof(*codes), sizeof(*codes),
                               syms,  sizeof(*syms),  sizeof(*syms), 0);
@@ -185,18 +187,17 @@ static int decode_plane10(UtvideoContext *c, int plane_no,
             goto fail;
         }
 
-        memcpy(c->slice_bits, src + slice_data_start + c->slices * 4,
-               slice_size);
         memset(c->slice_bits + slice_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
         c->bdsp.bswap_buf((uint32_t *) c->slice_bits,
-                          (uint32_t *) c->slice_bits,
+                          (uint32_t *)(src + slice_data_start + c->slices * 4),
                           (slice_data_end - slice_data_start + 3) >> 2);
         init_get_bits(&gb, c->slice_bits, slice_size * 8);
 
         prev = 0x200;
         for (j = sstart; j < send; j++) {
-            for (i = 0; i < width * step; i += step) {
-                pix = get_vlc2(&gb, vlc.table, vlc.bits, 3);
+            int ws = width * step;
+            for (i = 0; i < ws; i += step) {
+                pix = get_vlc2(&gb, vlc.table, VLC_BITS, 3);
                 if (pix < 0) {
                     av_log(c->avctx, AV_LOG_ERROR, "Decoding error\n");
                     goto fail;
@@ -291,18 +292,17 @@ static int decode_plane(UtvideoContext *c, int plane_no,
             goto fail;
         }
 
-        memcpy(c->slice_bits, src + slice_data_start + c->slices * 4,
-               slice_size);
         memset(c->slice_bits + slice_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
         c->bdsp.bswap_buf((uint32_t *) c->slice_bits,
-                          (uint32_t *) c->slice_bits,
+                          (uint32_t *)(src + slice_data_start + c->slices * 4),
                           (slice_data_end - slice_data_start + 3) >> 2);
         init_get_bits(&gb, c->slice_bits, slice_size * 8);
 
         prev = 0x80;
         for (j = sstart; j < send; j++) {
-            for (i = 0; i < width * step; i += step) {
-                pix = get_vlc2(&gb, vlc.table, vlc.bits, 3);
+            int ws = width * step;
+            for (i = 0; i < ws; i += step) {
+                pix = get_vlc2(&gb, vlc.table, VLC_BITS, 3);
                 if (pix < 0) {
                     av_log(c->avctx, AV_LOG_ERROR, "Decoding error\n");
                     goto fail;