qtrleenc: Keep coded_frame.key_frame a write-only variable

libavcodec/qtrleenc.c

@@ -57,6 +57,9 @@ typedef struct QtrleEncContext {
      * Will contain at ith position the number of consecutive pixels equal to the previous
      * frame starting from pixel i */
     uint8_t* skip_table;
+
+    /** Encoded frame is a key frame */
+    int key_frame;
 } QtrleEncContext;
 
 static av_cold int qtrle_encode_end(AVCodecContext *avctx)
@@ -159,7 +162,7 @@ static void qtrle_encode_line(QtrleEncContext *s, const AVFrame *p, int line, ui
 
     for (i = width - 1; i >= 0; i--) {
 
-        if (!s->avctx->coded_frame->key_frame && !memcmp(this_line, prev_line, s->pixel_size))
+        if (!s->key_frame && !memcmp(this_line, prev_line, s->pixel_size))
             skipcount = FFMIN(skipcount + 1, MAX_RLE_SKIP);
         else
             skipcount = 0;
@@ -263,7 +266,7 @@ static int encode_frame(QtrleEncContext *s, const AVFrame *p, uint8_t *buf)
     int end_line = s->avctx->height;
     uint8_t *orig_buf = buf;
 
-    if (!s->avctx->coded_frame->key_frame) {
+    if (!s->key_frame) {
         unsigned line_size = s->avctx->width * s->pixel_size;
         for (start_line = 0; start_line < s->avctx->height; start_line++)
             if (memcmp(p->data[0] + start_line*p->linesize[0],
@@ -301,7 +304,7 @@ static int qtrle_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                               const AVFrame *pict, int *got_packet)
 {
     QtrleEncContext * const s = avctx->priv_data;
-    AVFrame * const p = avctx->coded_frame;
+    enum AVPictureType pict_type;
     int ret;
 
     if ((ret = ff_alloc_packet(pkt, s->max_buf_size)) < 0) {
@@ -312,12 +315,12 @@ static int qtrle_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
 
     if (avctx->gop_size == 0 || (s->avctx->frame_number % avctx->gop_size) == 0) {
         /* I-Frame */
-        p->pict_type = AV_PICTURE_TYPE_I;
-        p->key_frame = 1;
+        pict_type = AV_PICTURE_TYPE_I;
+        s->key_frame = 1;
     } else {
         /* P-Frame */
-        p->pict_type = AV_PICTURE_TYPE_P;
-        p->key_frame = 0;
+        pict_type = AV_PICTURE_TYPE_P;
+        s->key_frame = 0;
     }
 
     pkt->size = encode_frame(s, pict, pkt->data);
@@ -326,7 +329,10 @@ static int qtrle_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     av_picture_copy(&s->previous_frame, (const AVPicture *)pict,
                     avctx->pix_fmt, avctx->width, avctx->height);
 
-    if (p->key_frame)
+    avctx->coded_frame->key_frame = s->key_frame;
+    avctx->coded_frame->pict_type = pict_type;
+
+    if (s->key_frame)
         pkt->flags |= AV_PKT_FLAG_KEY;
     *got_packet = 1;