1 files changed, 100 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavutil/fifo.h b/contrib/ffmpeg/libavutil/fifo.h
new file mode 100644
index 000000000..e1e85293d
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+++ b/contrib/ffmpeg/libavutil/fifo.h
@@ -0,0 +1,100 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * 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
+
+typedef struct AVFifoBuffer {
+    uint8_t *buffer;
+    uint8_t *rptr, *wptr, *end;
+} AVFifoBuffer;
+
+/**
+ * Initializes an AVFifoBuffer.
+ * @param *f AVFifoBuffer to initialize
+ * @param size of FIFO
+ * @return <0 for failure >=0 otherwise
+ */
+int av_fifo_init(AVFifoBuffer *f, int size);
+
+/**
+ * Frees an AVFifoBuffer.
+ * @param *f AVFifoBuffer to free
+ */
+void av_fifo_free(AVFifoBuffer *f);
+
+/**
+ * Returns the amount of data in bytes in the AVFifoBuffer, that is the
+ * amount of data you can read from it.
+ * @param *f AVFifoBuffer to read from
+ * @return size
+ */
+int av_fifo_size(AVFifoBuffer *f);
+
+/**
+ * Reads data from an AVFifoBuffer.
+ * @param *f AVFifoBuffer to read from
+ * @param *buf data destination
+ * @param buf_size number of bytes to read
+ */
+int av_fifo_read(AVFifoBuffer *f, uint8_t *buf, int buf_size);
+
+/**
+ * Feeds data from an AVFifoBuffer to a user supplied callback.
+ * @param *f AVFifoBuffer to read from
+ * @param buf_size number of bytes to read
+ * @param *func generic read function
+ * @param *dest data destination
+ */
+int av_fifo_generic_read(AVFifoBuffer *f, int buf_size, void (*func)(void*, void*, int), void* dest);
+
+/**
+ * Writes data into an AVFifoBuffer.
+ * @param *f AVFifoBuffer to write to
+ * @param *buf data source
+ * @param size data size
+ */
+void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size);
+
+/**
+ * Resizes an AVFifoBuffer.
+ * @param *f AVFifoBuffer to resize
+ * @param size new AVFifoBuffer size in bytes
+ */
+void av_fifo_realloc(AVFifoBuffer *f, unsigned int size);
+
+/**
+ * Reads and discards the specified amount of data from an AVFifoBuffer.
+ * @param *f AVFifoBuffer to read from
+ * @param size amount of data to read in bytes
+ */
+void av_fifo_drain(AVFifoBuffer *f, int size);
+
+static inline uint8_t av_fifo_peek(AVFifoBuffer *f, int offs)
+{
+    uint8_t *ptr = f->rptr + offs;
+    if (ptr >= f->end)
+        ptr -= f->end - f->buffer;
+    return *ptr;
+}
+#endif /* FIFO_H */