1 files changed, 114 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavutil/fifo.c b/contrib/ffmpeg/libavutil/fifo.c
new file mode 100644
index 000000000..8ac3a0cb5
--- /dev/null
+++ b/contrib/ffmpeg/libavutil/fifo.c
@@ -0,0 +1,114 @@
+/*
+ * A very simple circular buffer FIFO implementation
+ * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
+ * Copyright (c) 2006 Roman Shaposhnik
+ *
+ * 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
+ */
+#include "common.h"
+#include "fifo.h"
+
+int av_fifo_init(AVFifoBuffer *f, int size)
+{
+    f->wptr = f->rptr =
+    f->buffer = av_malloc(size);
+    f->end = f->buffer + size;
+    if (!f->buffer)
+        return -1;
+    return 0;
+}
+
+void av_fifo_free(AVFifoBuffer *f)
+{
+    av_free(f->buffer);
+}
+
+int av_fifo_size(AVFifoBuffer *f)
+{
+    int size = f->wptr - f->rptr;
+    if (size < 0)
+        size += f->end - f->buffer;
+    return size;
+}
+
+/**
+ * Get data from the fifo (returns -1 if not enough data).
+ */
+int av_fifo_read(AVFifoBuffer *f, uint8_t *buf, int buf_size)
+{
+    return av_fifo_generic_read(f, buf_size, NULL, buf);
+}
+
+/**
+ * Resizes a FIFO.
+ */
+void av_fifo_realloc(AVFifoBuffer *f, unsigned int new_size) {
+    unsigned int old_size= f->end - f->buffer;
+
+    if(old_size < new_size){
+        int len= av_fifo_size(f);
+        AVFifoBuffer f2;
+
+        av_fifo_init(&f2, new_size);
+        av_fifo_read(f, f2.buffer, len);
+        f2.wptr += len;
+        av_free(f->buffer);
+        *f= f2;
+    }
+}
+
+void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size)
+{
+    do {
+        int len = FFMIN(f->end - f->wptr, size);
+        memcpy(f->wptr, buf, len);
+        f->wptr += len;
+        if (f->wptr >= f->end)
+            f->wptr = f->buffer;
+        buf += len;
+        size -= len;
+    } while (size > 0);
+}
+
+
+/** get data from the fifo (return -1 if not enough data) */
+int av_fifo_generic_read(AVFifoBuffer *f, int buf_size, void (*func)(void*, void*, int), void* dest)
+{
+    int size = av_fifo_size(f);
+
+    if (size < buf_size)
+        return -1;
+    do {
+        int len = FFMIN(f->end - f->rptr, buf_size);
+        if(func) func(dest, f->rptr, len);
+        else{
+            memcpy(dest, f->rptr, len);
+            dest = (uint8_t*)dest + len;
+        }
+        av_fifo_drain(f, len);
+        buf_size -= len;
+    } while (buf_size > 0);
+    return 0;
+}
+
+/** discard data from the fifo */
+void av_fifo_drain(AVFifoBuffer *f, int size)
+{
+    f->rptr += size;
+    if (f->rptr >= f->end)
+        f->rptr -= f->end - f->buffer;
+}