1 files changed, 64 insertions, 0 deletions
diff --git a/libavutil/fifo.h b/libavutil/fifo.h
index 52badcd237..177603434f 100644
--- a/libavutil/fifo.h
+++ b/libavutil/fifo.h
@@ -16,6 +16,11 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+/**
+ * @file fifo.h
+ * A very simple circular buffer FIFO implementation.
+ */
+
 #ifndef FIFO_H
 #define FIFO_H
 
@@ -24,15 +29,74 @@ typedef struct AVFifoBuffer {
     uint8_t *rptr, *wptr, *end;
 } AVFifoBuffer;
 
+/**
+ * Initializes a FIFO *.
+ * @param *f FIFO buffer
+ * @param size of FIFO
+ * @return <0 for failure >=0 otherwise
+ */
 int av_fifo_init(AVFifoBuffer *f, int size);
+
+/**
+ * Frees a FIFO *.
+ * @param *f FIFO buffer
+ */
 void av_fifo_free(AVFifoBuffer *f);
+
+/**
+ * Returns the size of a FIFO *.
+ * @param *f FIFO buffer
+ * @return size
+ */
 int av_fifo_size(AVFifoBuffer *f);
+
+/**
+ * Reads the data from the FIFO *.
+ * @param *f FIFO buffer
+ * @param *buf data destination
+ * @param buf_size data size
+ * @return -1 if not enough data
+ */
 int av_fifo_read(AVFifoBuffer *f, uint8_t *buf, int buf_size);
+
+/**
+ * Reads the data from the FIFO *.
+ * @param *f FIFO buffer
+ * @param buf_size data size
+ * @param *func generic read function
+ * @param *dest data destination
+ * @return -1 if not enough data
+ */
 int av_fifo_generic_read(AVFifoBuffer *f, int buf_size, void (*func)(void*, void*, int), void* dest);
+
+/**
+ * Writes the data in the FIFO *.
+ * @param *f FIFO buffer
+ * @param *buf data source
+ * @param size data size
+ */
 void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size);
+
+/**
+ * Resizes the FIFO *.
+ * @param *f FIFO buffer
+ * @param size data size
+ */
 void av_fifo_realloc(AVFifoBuffer *f, unsigned int size);
+
+/**
+ * Discards the data from the FIFO *.
+ * @param *f FIFO buffer
+ * @param size data size
+ */
 void av_fifo_drain(AVFifoBuffer *f, int size);
 
+/**
+ * Returns a pointer with circular offset from FIFO's read pointer.
+ * @param *f FIFO buffer
+ * @param offs offset
+ * @return ptr=rptr+offs if rptr+offs<end else rptr+offs -(end-begin)
+ */
 static inline uint8_t av_fifo_peek(AVFifoBuffer *f, int offs)
 {
     uint8_t *ptr = f->rptr + offs;