avcodec: Constify AVCodecs

[ffmpeg] / libavcodec / snowdec.c

diff --git a/libavcodec/snowdec.c b/libavcodec/snowdec.c
index 59bd24e8811a4b39c25854c48ec4c9443dddf6e5..7367176f07bbb9b39731acaaccb2a3a56e7be4d9 100644 (file)
--- a/libavcodec/snowdec.c
+++ b/libavcodec/snowdec.c
@@ -117,7 +117,7 @@ static av_always_inline void predict_slice_buffered(SnowContext *s, slice_buffer
 static inline void decode_subband_slice_buffered(SnowContext *s, SubBand *b, slice_buffer * sb, int start_y, int h, int save_state[1]){
     const int w= b->width;
     int y;
-    const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
+    const int qlog= av_clip(s->qlog + (int64_t)b->qlog, 0, QROOT*16);
     int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
     int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
     int new_index = 0;
@@ -224,7 +224,7 @@ static int decode_q_branch(SnowContext *s, int level, int x, int y){
 
 static void dequantize_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int start_y, int end_y){
     const int w= b->width;
-    const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
+    const int qlog= av_clip(s->qlog + (int64_t)b->qlog, 0, QROOT*16);
     const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
     const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
     int x,y;
@@ -369,7 +369,10 @@ static int decode_header(SnowContext *s){
                 htaps = htaps*2 + 2;
                 p->htaps= htaps;
                 for(i= htaps/2; i; i--){
-                    p->hcoeff[i]= get_symbol(&s->c, s->header_state, 0) * (1-2*(i&1));
+                    unsigned hcoeff = get_symbol(&s->c, s->header_state, 0);
+                    if (hcoeff > 127)
+                        return AVERROR_INVALIDDATA;
+                    p->hcoeff[i]= hcoeff * (1-2*(i&1));
                     sum += p->hcoeff[i];
                 }
                 p->hcoeff[0]= 32-sum;
@@ -419,17 +422,6 @@ static int decode_header(SnowContext *s){
     return 0;
 }
 
-static av_cold int decode_init(AVCodecContext *avctx)
-{
-    int ret;
-
-    if ((ret = ff_snow_common_init(avctx)) < 0) {
-        return ret;
-    }
-
-    return 0;
-}
-
 static int decode_blocks(SnowContext *s){
     int x, y;
     int w= s->b_width;
@@ -502,7 +494,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
               );
 
     av_assert0(!s->avmv);
-    if (s->avctx->flags2 & AV_CODEC_FLAG2_EXPORT_MVS) {
+    if (s->avctx->export_side_data & AV_CODEC_EXPORT_DATA_MVS) {
         s->avmv = av_malloc_array(s->b_width * s->b_height, sizeof(AVMotionVector) << (s->block_max_depth*2));
     }
     s->avmv_index = 0;
@@ -656,13 +648,13 @@ static av_cold int decode_end(AVCodecContext *avctx)
     return 0;
 }
 
-AVCodec ff_snow_decoder = {
+const AVCodec ff_snow_decoder = {
     .name           = "snow",
     .long_name      = NULL_IF_CONFIG_SMALL("Snow"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_SNOW,
     .priv_data_size = sizeof(SnowContext),
-    .init           = decode_init,
+    .init           = ff_snow_common_init,
     .close          = decode_end,
     .decode         = decode_frame,
     .capabilities   = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,