From 0ea721f7ce81357bc4ec6eea609cd50482c3d15b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Diego=20=27Flameeyes=27=20Petten=C3=B2?=
 <flameeyes@gmail.com>
Date: Sat, 2 Dec 2006 01:19:48 +0000
Subject: Start working on a branch where FFmpeg is not copied, patched and
 carved to be built with automake but instead imported inline and built using
 its own build system. This is an import of a slightly modified FFmpeg current
 tree. xine-lib builds, install and run fine with it, but there are of course
 plenty of things that needs to be fixed before it can even be considered for
 a 1.2.x series. Work will continue in the next days of course.

CVS patchset: 8397
CVS date: 2006/12/02 01:19:48
---
 contrib/ffmpeg/libavutil/fifo.c | 137 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 contrib/ffmpeg/libavutil/fifo.c

(limited to 'contrib/ffmpeg/libavutil/fifo.c')

diff --git a/contrib/ffmpeg/libavutil/fifo.c b/contrib/ffmpeg/libavutil/fifo.c
new file mode 100644
index 000000000..550f13de5
--- /dev/null
+++ b/contrib/ffmpeg/libavutil/fifo.c
@@ -0,0 +1,137 @@
+/*
+ * 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->buffer = av_malloc(size);
+    if (!f->buffer)
+        return -1;
+    f->end = f->buffer + size;
+    f->wptr = f->rptr = f->buffer;
+    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)
+{
+    int len;
+    int size = f->wptr - f->rptr;
+    if (size < 0)
+        size += f->end - f->buffer;
+
+    if (size < buf_size)
+        return -1;
+    while (buf_size > 0) {
+        len = FFMIN(f->end - f->rptr, buf_size);
+        memcpy(buf, f->rptr, len);
+        buf += len;
+        f->rptr += len;
+        if (f->rptr >= f->end)
+            f->rptr = f->buffer;
+        buf_size -= len;
+    }
+    return 0;
+}
+
+/**
+ * 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){
+        uint8_t *old= f->buffer;
+
+        f->buffer= av_realloc(f->buffer, new_size);
+
+        f->rptr += f->buffer - old;
+        f->wptr += f->buffer - old;
+
+        if(f->wptr < f->rptr){
+            memmove(f->rptr + new_size - old_size, f->rptr, f->buffer + old_size - f->rptr);
+            f->rptr += new_size - old_size;
+        }
+        f->end= f->buffer + new_size;
+    }
+}
+
+void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size)
+{
+    int len;
+
+    while (size > 0) {
+        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;
+    }
+}
+
+
+/* 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 len;
+    int size = f->wptr - f->rptr;
+    if (size < 0)
+        size += f->end - f->buffer;
+
+    if (size < buf_size)
+        return -1;
+    while (buf_size > 0) {
+        len = FFMIN(f->end - f->rptr, buf_size);
+        func(dest, f->rptr, len);
+        f->rptr += len;
+        if (f->rptr >= f->end)
+            f->rptr = f->buffer;
+        buf_size -= len;
+    }
+    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;
+}
-- 
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