avcodec: Constify AVCodecs

[ffmpeg] / libavcodec / cavsdec.c

diff --git a/libavcodec/cavsdec.c b/libavcodec/cavsdec.c
index c7fff67c06c660ce31e11b7d3aea8cf8b5b725a7..692c77eb3900d8eb5659d965ab9c130bac9932ae 100644 (file)
--- a/libavcodec/cavsdec.c
+++ b/libavcodec/cavsdec.c
@@ -591,14 +591,21 @@ static int decode_residual_block(AVSContext *h, GetBitContext *gb,
 }
 
 
-static inline void decode_residual_chroma(AVSContext *h)
+static inline int decode_residual_chroma(AVSContext *h)
 {
-    if (h->cbp & (1 << 4))
-        decode_residual_block(h, &h->gb, chroma_dec, 0,
+    if (h->cbp & (1 << 4)) {
+        int ret = decode_residual_block(h, &h->gb, chroma_dec, 0,
                               ff_cavs_chroma_qp[h->qp], h->cu, h->c_stride);
-    if (h->cbp & (1 << 5))
-        decode_residual_block(h, &h->gb, chroma_dec, 0,
+        if (ret < 0)
+            return ret;
+    }
+    if (h->cbp & (1 << 5)) {
+        int ret = decode_residual_block(h, &h->gb, chroma_dec, 0,
                               ff_cavs_chroma_qp[h->qp], h->cv, h->c_stride);
+        if (ret < 0)
+            return ret;
+    }
+    return 0;
 }
 
 static inline int decode_residual_inter(AVSContext *h)
@@ -649,6 +656,7 @@ static int decode_mb_i(AVSContext *h, int cbp_code)
     uint8_t top[18];
     uint8_t *left = NULL;
     uint8_t *d;
+    int ret;
 
     ff_cavs_init_mb(h);
 
@@ -668,7 +676,7 @@ static int decode_mb_i(AVSContext *h, int cbp_code)
         }
         h->pred_mode_Y[pos] = predpred;
     }
-    pred_mode_uv = get_ue_golomb(gb);
+    pred_mode_uv = get_ue_golomb_31(gb);
     if (pred_mode_uv > 6) {
         av_log(h->avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n");
         return AVERROR_INVALIDDATA;
@@ -692,8 +700,11 @@ static int decode_mb_i(AVSContext *h, int cbp_code)
         ff_cavs_load_intra_pred_luma(h, top, &left, block);
         h->intra_pred_l[h->pred_mode_Y[scan3x3[block]]]
             (d, top, left, h->l_stride);
-        if (h->cbp & (1<<block))
-            decode_residual_block(h, gb, intra_dec, 1, h->qp, d, h->l_stride);
+        if (h->cbp & (1<<block)) {
+            ret = decode_residual_block(h, gb, intra_dec, 1, h->qp, d, h->l_stride);
+            if (ret < 0)
+                return ret;
+        }
     }
 
     /* chroma intra prediction */
@@ -703,7 +714,9 @@ static int decode_mb_i(AVSContext *h, int cbp_code)
     h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx * 10],
                                   h->left_border_v, h->c_stride);
 
-    decode_residual_chroma(h);
+    ret = decode_residual_chroma(h);
+    if (ret < 0)
+        return ret;
     ff_cavs_filter(h, I_8X8);
     set_mv_intra(h);
     return 0;
@@ -1088,11 +1101,20 @@ static int decode_pic(AVSContext *h)
         do {
             if (check_for_slice(h))
                 skip_count = -1;
-            if (h->skip_mode_flag && (skip_count < 0))
+            if (h->skip_mode_flag && (skip_count < 0)) {
+                if (get_bits_left(&h->gb) < 1) {
+                    ret = AVERROR_INVALIDDATA;
+                    break;
+                }
                 skip_count = get_ue_golomb(&h->gb);
+            }
             if (h->skip_mode_flag && skip_count--) {
                 decode_mb_p(h, P_SKIP);
             } else {
+                if (get_bits_left(&h->gb) < 1) {
+                    ret = AVERROR_INVALIDDATA;
+                    break;
+                }
                 mb_type = get_ue_golomb(&h->gb) + P_SKIP + h->skip_mode_flag;
                 if (mb_type > P_8X8)
                     ret = decode_mb_i(h, mb_type - P_8X8 - 1);
@@ -1106,11 +1128,20 @@ static int decode_pic(AVSContext *h)
         do {
             if (check_for_slice(h))
                 skip_count = -1;
-            if (h->skip_mode_flag && (skip_count < 0))
+            if (h->skip_mode_flag && (skip_count < 0)) {
+                if (get_bits_left(&h->gb) < 1) {
+                    ret = AVERROR_INVALIDDATA;
+                    break;
+                }
                 skip_count = get_ue_golomb(&h->gb);
+            }
             if (h->skip_mode_flag && skip_count--) {
                 ret = decode_mb_b(h, B_SKIP);
             } else {
+                if (get_bits_left(&h->gb) < 1) {
+                    ret = AVERROR_INVALIDDATA;
+                    break;
+                }
                 mb_type = get_ue_golomb(&h->gb) + B_SKIP + h->skip_mode_flag;
                 if (mb_type > B_8X8)
                     ret = decode_mb_i(h, mb_type - B_8X8 - 1);
@@ -1202,6 +1233,7 @@ static int cavs_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     int input_size, ret;
     const uint8_t *buf_end;
     const uint8_t *buf_ptr;
+    int frame_start = 0;
 
     if (buf_size == 0) {
         if (!h->low_delay && h->DPB[0].f->data[0]) {
@@ -1235,6 +1267,9 @@ static int cavs_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                 h->got_keyframe = 1;
             }
         case PIC_PB_START_CODE:
+            if (frame_start > 1)
+                return AVERROR_INVALIDDATA;
+            frame_start ++;
             if (*got_frame)
                 av_frame_unref(data);
             *got_frame = 0;
@@ -1272,7 +1307,7 @@ static int cavs_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
     }
 }
 
-AVCodec ff_cavs_decoder = {
+const AVCodec ff_cavs_decoder = {
     .name           = "cavs",
     .long_name      = NULL_IF_CONFIG_SMALL("Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)"),
     .type           = AVMEDIA_TYPE_VIDEO,