avcodec/v4l2_m2m: Use consistent logging context

Before this commit v4l2_m2m used two different logging contexts (from
V4L2m2mPriv and AVCodecContext). For consistency always use AVCodecContext.
Signed-off-by: Andriy Gelman <andriy.gelman@gmail.com>

libavcodec/v4l2_context.c

@@ -50,7 +50,7 @@ static inline V4L2m2mContext *ctx_to_m2mctx(V4L2Context *ctx)
 
 static inline AVClass *logger(V4L2Context *ctx)
 {
-    return ctx_to_m2mctx(ctx)->priv;
+    return ctx_to_m2mctx(ctx)->avctx;
 }
 
 static inline unsigned int v4l2_get_width(struct v4l2_format *fmt)

libavcodec/v4l2_m2m.c

@@ -63,7 +63,7 @@ static inline int v4l2_mplane_video(struct v4l2_capability *cap)
 static int v4l2_prepare_contexts(V4L2m2mContext* s, int probe)
 {
     struct v4l2_capability cap;
-    void *log_ctx = s->priv;
+    void *log_ctx = s->avctx;
     int ret;
 
     s->capture.done = s->output.done = 0;
@@ -99,7 +99,7 @@ static int v4l2_prepare_contexts(V4L2m2mContext* s, int probe)
 
 static int v4l2_probe_driver(V4L2m2mContext* s)
 {
-    void *log_ctx = s->priv;
+    void *log_ctx = s->avctx;
     int ret;
 
     s->fd = open(s->devname, O_RDWR | O_NONBLOCK, 0);
@@ -135,7 +135,7 @@ done:
 
 static int v4l2_configure_contexts(V4L2m2mContext* s)
 {
-    void *log_ctx = s->priv;
+    void *log_ctx = s->avctx;
     int ret;
     struct v4l2_format ofmt, cfmt;
 
@@ -204,7 +204,7 @@ error:
  ******************************************************************************/
 int ff_v4l2_m2m_codec_reinit(V4L2m2mContext* s)
 {
-    void *log_ctx = s->priv;
+    void *log_ctx = s->avctx;
     int ret;
 
     av_log(log_ctx, AV_LOG_DEBUG, "reinit context\n");
@@ -340,11 +340,11 @@ int ff_v4l2_m2m_codec_end(V4L2m2mPriv *priv)
 
     ret = ff_v4l2_context_set_status(&s->output, VIDIOC_STREAMOFF);
     if (ret)
-        av_log(priv, AV_LOG_ERROR, "VIDIOC_STREAMOFF %s\n", s->output.name);
+        av_log(s->avctx, AV_LOG_ERROR, "VIDIOC_STREAMOFF %s\n", s->output.name);
 
     ret = ff_v4l2_context_set_status(&s->capture, VIDIOC_STREAMOFF);
     if (ret)
-        av_log(priv, AV_LOG_ERROR, "VIDIOC_STREAMOFF %s\n", s->capture.name);
+        av_log(s->avctx, AV_LOG_ERROR, "VIDIOC_STREAMOFF %s\n", s->capture.name);
 
     ff_v4l2_context_release(&s->output);
 
@@ -373,7 +373,7 @@ int ff_v4l2_m2m_codec_init(V4L2m2mPriv *priv)
             continue;
 
         snprintf(node, sizeof(node), "/dev/%s", entry->d_name);
-        av_log(priv, AV_LOG_DEBUG, "probing device %s\n", node);
+        av_log(s->avctx, AV_LOG_DEBUG, "probing device %s\n", node);
         strncpy(s->devname, node, strlen(node) + 1);
         ret = v4l2_probe_driver(s);
         if (!ret)
@@ -383,13 +383,13 @@ int ff_v4l2_m2m_codec_init(V4L2m2mPriv *priv)
     closedir(dirp);
 
     if (ret) {
-        av_log(priv, AV_LOG_ERROR, "Could not find a valid device\n");
+        av_log(s->avctx, AV_LOG_ERROR, "Could not find a valid device\n");
         memset(s->devname, 0, sizeof(s->devname));
 
         return ret;
     }
 
-    av_log(priv, AV_LOG_INFO, "Using device %s\n", node);
+    av_log(s->avctx, AV_LOG_INFO, "Using device %s\n", node);
 
     return v4l2_configure_contexts(s);
 }