avcodec/v4l2_m2m: decouple v4l2_m2m helpers from AVCodecContext

This will allow re-use of the m2m backend with AVFilterContext

Signed-off-by: Aman Gupta <aman@tmm1.net>

1 files changed, 10 insertions, 8 deletions

diff --git a/libavcodec/v4l2_m2m.h b/libavcodec/v4l2_m2m.h
index 0d4671b..c860e96 100644
--- a/libavcodec/v4l2_m2m.h
+++ b/libavcodec/v4l2_m2m.h
@@ -59,10 +59,12 @@ typedef struct V4L2m2mContext {
 
     /* Reference to self; only valid while codec is active. */
     AVBufferRef *self_ref;
+
+    /* reference back to V4L2m2mPriv */
+    void *priv;
 } V4L2m2mContext;
 
-typedef struct V4L2m2mPriv
-{
+typedef struct V4L2m2mPriv {
     AVClass *class;
 
     V4L2m2mContext *context;
@@ -75,33 +77,33 @@ typedef struct V4L2m2mPriv
 /**
  * Allocate a new context and references for a V4L2 M2M instance.
  *
- * @param[in] ctx The AVCodecContext instantiated by the encoder/decoder.
+ * @param[in] ctx The V4L2m2mPriv instantiated by the encoder/decoder.
  * @param[out] ctx The V4L2m2mContext.
  *
  * @returns 0 in success, a negative error code otherwise.
  */
-int ff_v4l2_m2m_create_context(AVCodecContext *avctx, V4L2m2mContext **s);
+int ff_v4l2_m2m_create_context(V4L2m2mPriv *priv, V4L2m2mContext **s);
 
 
 /**
  * Probes the video nodes looking for the required codec capabilities.
  *
- * @param[in] ctx The AVCodecContext instantiated by the encoder/decoder.
+ * @param[in] ctx The V4L2m2mPriv instantiated by the encoder/decoder.
  *
  * @returns 0 if a driver is found, a negative number otherwise.
  */
-int ff_v4l2_m2m_codec_init(AVCodecContext *avctx);
+int ff_v4l2_m2m_codec_init(V4L2m2mPriv *priv);
 
 /**
  * Releases all the codec resources if all AVBufferRefs have been returned to the
  * ctx. Otherwise keep the driver open.
  *
- * @param[in] The AVCodecContext instantiated by the encoder/decoder.
+ * @param[in] The V4L2m2mPriv instantiated by the encoder/decoder.
  *
  * @returns 0
  *
  */
-int ff_v4l2_m2m_codec_end(AVCodecContext *avctx);
+int ff_v4l2_m2m_codec_end(V4L2m2mPriv *priv);
 
 /**
  * Reinitializes the V4L2m2mContext when the driver cannot continue processing