roqvideoenc: add const qualifier to the input frame.

libavcodec/roqvideo.h

@@ -69,7 +69,7 @@ typedef struct RoqContext {
 
     unsigned int framesSinceKeyframe;
 
-    AVFrame *frame_to_enc;
+    const AVFrame *frame_to_enc;
     uint8_t *out_buf;
     struct RoqTempData *tmpData;
 } RoqContext;

libavcodec/roqvideoenc.c

@@ -112,7 +112,7 @@ static inline int square(int x)
     return x*x;
 }
 
-static inline int eval_sse(uint8_t *a, uint8_t *b, int count)
+static inline int eval_sse(const uint8_t *a, const uint8_t *b, int count)
 {
     int diff=0;
 
@@ -124,8 +124,8 @@ static inline int eval_sse(uint8_t *a, uint8_t *b, int count)
 
 // FIXME Could use DSPContext.sse, but it is not so speed critical (used
 // just for motion estimation).
-static int block_sse(uint8_t **buf1, uint8_t **buf2, int x1, int y1, int x2,
-                     int y2, int *stride1, int *stride2, int size)
+static int block_sse(uint8_t * const *buf1, uint8_t * const *buf2, int x1, int y1,
+                     int x2, int y2, const int *stride1, const int *stride2, int size)
 {
     int i, k;
     int sse=0;
@@ -260,7 +260,7 @@ static void create_cel_evals(RoqContext *enc, RoqTempdata *tempData)
 /**
  * Get macroblocks from parts of the image
  */
-static void get_frame_mb(AVFrame *frame, int x, int y, uint8_t mb[], int dim)
+static void get_frame_mb(const AVFrame *frame, int x, int y, uint8_t mb[], int dim)
 {
     int i, j, cp;
 
@@ -754,8 +754,8 @@ static void reconstruct_and_encode_image(RoqContext *enc, RoqTempdata *tempData,
 /**
  * Create a single YUV cell from a 2x2 section of the image
  */
-static inline void frame_block_to_cell(uint8_t *block, uint8_t **data,
-                                       int top, int left, int *stride)
+static inline void frame_block_to_cell(uint8_t *block, uint8_t * const *data,
+                                       int top, int left, const int *stride)
 {
     int i, j, u=0, v=0;
 
@@ -775,7 +775,7 @@ static inline void frame_block_to_cell(uint8_t *block, uint8_t **data,
 /**
  * Create YUV clusters for the entire image
  */
-static void create_clusters(AVFrame *frame, int w, int h, uint8_t *yuvClusters)
+static void create_clusters(const AVFrame *frame, int w, int h, uint8_t *yuvClusters)
 {
     int i, j, k, l;
 
@@ -1004,7 +1004,7 @@ static void roq_write_video_info_chunk(RoqContext *enc)
 static int roq_encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data)
 {
     RoqContext *enc = avctx->priv_data;
-    AVFrame *frame= data;
+    const AVFrame *frame= data;
     uint8_t *buf_start = buf;
 
     enc->out_buf = buf;