Document av_lfg_get().

[ffmpeg] / libavutil / fifo.c

diff --git a/libavutil/fifo.c b/libavutil/fifo.c
index 8ac3a0cb55ca4c3a1eb35f2368ff07b51ad9e2be..eda3558436a738a09bfd6b1eeb541b61b3fc8511 100644 (file)
--- a/libavutil/fifo.c
+++ b/libavutil/fifo.c
@@ -22,8 +22,9 @@
 #include "common.h"
 #include "fifo.h"
 
-int av_fifo_init(AVFifoBuffer *f, int size)
+int av_fifo_init(AVFifoBuffer *f, unsigned int size)
 {
+    size= FFMAX(size, size+1);
     f->wptr = f->rptr =
     f->buffer = av_malloc(size);
     f->end = f->buffer + size;
@@ -45,9 +46,6 @@ int av_fifo_size(AVFifoBuffer *f)
     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);
@@ -59,7 +57,7 @@ int av_fifo_read(AVFifoBuffer *f, uint8_t *buf, int buf_size)
 void av_fifo_realloc(AVFifoBuffer *f, unsigned int new_size) {
     unsigned int old_size= f->end - f->buffer;
 
-    if(old_size < new_size){
+    if(old_size <= new_size){
         int len= av_fifo_size(f);
         AVFifoBuffer f2;
 
@@ -73,25 +71,32 @@ 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 *src, int size, int (*func)(void*, void*, int))
+{
+    int total = size;
     do {
         int len = FFMIN(f->end - f->wptr, size);
-        memcpy(f->wptr, buf, len);
+        if(func) {
+            if(func(src, f->wptr, len) <= 0)
+                break;
+        } else {
+            memcpy(f->wptr, src, len);
+            src = (uint8_t*)src + len;
+        }
         f->wptr += len;
         if (f->wptr >= f->end)
             f->wptr = f->buffer;
-        buf += len;
         size -= len;
     } while (size > 0);
+    return total - size;
 }
 
 
-/** 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);