avcodec: Constify all the AVCodecParsers

[ffmpeg] / libavcodec / v4l2_m2m.h

diff --git a/libavcodec/v4l2_m2m.h b/libavcodec/v4l2_m2m.h
index afa3987c46635e2e20516ea148b23a9a3d00a77c..b67b21633109deb15df0c566a7098adc99045ea2 100644 (file)
--- a/libavcodec/v4l2_m2m.h
+++ b/libavcodec/v4l2_m2m.h
@@ -38,11 +38,9 @@
 
 #define V4L_M2M_DEFAULT_OPTS \
     { "num_output_buffers", "Number of buffers in the output context",\
-        OFFSET(output.num_buffers), AV_OPT_TYPE_INT, { .i64 = 16 }, 6, INT_MAX, FLAGS }
+        OFFSET(num_output_buffers), AV_OPT_TYPE_INT, { .i64 = 16 }, 6, INT_MAX, FLAGS }
 
-typedef struct V4L2m2mContext
-{
-    AVClass *class;
+typedef struct V4L2m2mContext {
     char devname[PATH_MAX];
     int fd;
 
@@ -50,40 +48,69 @@ typedef struct V4L2m2mContext
     V4L2Context capture;
     V4L2Context output;
 
-    /* refcount of buffers held by the user */
-    atomic_uint refcount;
-
     /* dynamic stream reconfig */
     AVCodecContext *avctx;
     sem_t refsync;
+    atomic_uint refcount;
     int reinit;
 
     /* null frame/packet received */
     int draining;
+    AVPacket buf_pkt;
+
+    /* Reference to a frame. Only used during encoding */
+    AVFrame *frame;
+
+    /* Reference to self; only valid while codec is active. */
+    AVBufferRef *self_ref;
+
+    /* reference back to V4L2m2mPriv */
+    void *priv;
 } V4L2m2mContext;
 
+typedef struct V4L2m2mPriv {
+    AVClass *class;
+
+    V4L2m2mContext *context;
+    AVBufferRef    *context_ref;
+
+    int num_output_buffers;
+    int num_capture_buffers;
+} V4L2m2mPriv;
+
+/**
+ * Allocate a new context and references for a V4L2 M2M instance.
+ *
+ * @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(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 cant continue processing
+ * Reinitializes the V4L2m2mContext when the driver cannot continue processing
  * with the capture parameters.
  *
  * @param[in] ctx The V4L2m2mContext instantiated by the encoder/decoder.
@@ -93,7 +120,7 @@ int ff_v4l2_m2m_codec_end(AVCodecContext *avctx);
 int ff_v4l2_m2m_codec_reinit(V4L2m2mContext *ctx);
 
 /**
- * Reinitializes the V4L2m2mContext when the driver cant continue processing
+ * Reinitializes the V4L2m2mContext when the driver cannot continue processing
  * with the  any of the current V4L2Contexts (ie, changes in output and capture).
  *
  * @param[in] ctx The V4L2m2mContext instantiated by the encoder/decoder.