add a logging callback mechanism

1 files changed, 14 insertions, 0 deletions

diff --git a/include/dav1d/dav1d.h b/include/dav1d/dav1d.h
index 15365e1..82f0a2c 100644
--- a/include/dav1d/dav1d.h
+++ b/include/dav1d/dav1d.h
@@ -33,6 +33,7 @@ extern "C" {
 #endif
 
 #include <errno.h>
+#include <stdarg.h>
 
 #include "common.h"
 #include "picture.h"
@@ -44,10 +45,23 @@ typedef struct Dav1dRef Dav1dRef;
 #define DAV1D_MAX_FRAME_THREADS 256
 #define DAV1D_MAX_TILE_THREADS 64
 
+typedef struct Dav1dLogger {
+    void *cookie; ///< Custom data to pass to the callback.
+    /**
+     * Logger callback. Default prints to stderr. May be NULL to disable logging.
+     *
+     * @param cookie Custom pointer passed to all calls.
+     * @param format The vprintf compatible format string.
+     * @param     ap List of arguments referenced by the format string.
+     */
+    void (*callback)(void *cookie, const char *format, va_list ap);
+} Dav1dLogger;
+
 typedef struct Dav1dSettings {
     int n_frame_threads;
     int n_tile_threads;
     Dav1dPicAllocator allocator;
+    Dav1dLogger logger;
     int apply_grain;
     int operating_point; ///< select an operating point for scalable AV1 bitstreams (0 - 31)
     int all_layers; ///< output all spatial layers of a scalable AV1 biststream