1 files changed, 26 insertions, 49 deletions

diff --git a/contrib/ffmpeg/libavutil/fifo.c b/contrib/ffmpeg/libavutil/fifo.c
index 550f13de5..8ac3a0cb5 100644
--- a/contrib/ffmpeg/libavutil/fifo.c
+++ b/contrib/ffmpeg/libavutil/fifo.c
@@ -24,11 +24,11 @@
 
 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;
-    f->end = f->buffer + size;
-    f->wptr = f->rptr = f->buffer;
     return 0;
 }
 
@@ -50,23 +50,7 @@ int av_fifo_size(AVFifoBuffer *f)
  */
 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;
+    return av_fifo_generic_read(f, buf_size, NULL, buf);
 }
 
 /**
@@ -76,59 +60,52 @@ 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;
+        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)
 {
-    int len;
-
-    while (size > 0) {
-        len = FFMIN(f->end - f->wptr, 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) */
+/** 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;
+    int size = av_fifo_size(f);
 
     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;
+    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 */
+/** discard data from the fifo */
 void av_fifo_drain(AVFifoBuffer *f, int size)
 {
     f->rptr += size;