From 49cec1998af4c8806f4981d12daa28091ccb0425 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Axelsson?= <gecko@acc.umu.se>
Date: Wed, 9 Apr 2008 11:35:16 +0000
Subject: [PATCH] =?UTF-8?q?Add=20a=20generic=20write=20function=20to=20av?=
 =?UTF-8?q?=5Ffifo.=20Patch=20by=20Bj=C3=B6rn=20Axelsson:=20bjorn=20axelss?=
 =?UTF-8?q?on=20intinor=20se=20Original=20thread:=20[FFmpeg-devel]=20[RFC]?=
 =?UTF-8?q?[PATCH]=20av=5Ffifo=5Fwrite=5Ffrom=5Fbytestream()=20Date:=2004/?=
 =?UTF-8?q?03/2008=2012:14=20PM?=
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Originally committed as revision 12773 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavutil/fifo.c | 14 +++++++++++++-
 libavutil/fifo.h | 16 +++++++++++++++-
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/libavutil/fifo.c b/libavutil/fifo.c
index 8ac3a0cb55..08b5977a1a 100644
--- a/libavutil/fifo.c
+++ b/libavutil/fifo.c
@@ -73,15 +73,27 @@ void av_fifo_realloc(AVFifoBuffer *f, unsigned int new_size) {
 
 void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size)
 {
+    av_fifo_generic_write(f, (void *)buf, size, NULL);
+}
+
+int av_fifo_generic_write(AVFifoBuffer *f, void *buf, int size, int (*func)(void*, void*, int))
+{
+    int total = size;
     do {
         int len = FFMIN(f->end - f->wptr, size);
+        if(func) {
+            if(func(buf, f->wptr, len) <= 0)
+                break;
+        } else {
         memcpy(f->wptr, buf, len);
+            buf = (uint8_t*)buf + len;
+        }
         f->wptr += len;
         if (f->wptr >= f->end)
             f->wptr = f->buffer;
-        buf += len;
         size -= len;
     } while (size > 0);
+    return total - size;
 }
 
 
diff --git a/libavutil/fifo.h b/libavutil/fifo.h
index 817a8a6b61..fccb322dbf 100644
--- a/libavutil/fifo.h
+++ b/libavutil/fifo.h
@@ -76,7 +76,21 @@ int av_fifo_generic_read(AVFifoBuffer *f, int buf_size, void (*func)(void*, void
  * @param *buf data source
  * @param size data size
  */
-void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size);
+attribute_deprecated void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size);
+
+/**
+ * Feeds data from a user supplied callback to an AVFifoBuffer.
+ * @param *f AVFifoBuffer to write to
+ * @param *buf data source
+ * @param size number of bytes to write
+ * @param *func generic write function. First parameter is buf,
+ * second is dest_buf, third is dest_buf_size.
+ * func must return the number of bytes written to dest_buf, or <= 0 to
+ * indicate no more data available to write.
+ * If func is NULL, buf is interpreted as a simple byte array for source data.
+ * @return the number of bytes written to the fifo.
+ */
+int av_fifo_generic_write(AVFifoBuffer *f, void *buf, int size, int (*func)(void*, void*, int));
 
 /**
  * Resizes an AVFifoBuffer.