From f4c04dbcdcdc48f8ff8f74719c5beb3929c1bd0f Mon Sep 17 00:00:00 2001
From: x <x@x.x>
Date: Wed, 10 Oct 2012 01:02:03 +0200
Subject: [PATCH] lavf/file: WIP loop

---
 libavformat/file.c |   29 ++++++++++++++++++++++-------
 1 file changed, 22 insertions(+), 7 deletions(-)

diff --git a/libavformat/file.c b/libavformat/file.c
index 209957b..07dbd6d 100644
--- a/libavformat/file.c
+++ b/libavformat/file.c
@@ -49,10 +49,14 @@ typedef struct FileContext {
     const AVClass *class;
     int fd;
     int trunc;
+    int loop;
+    const char *fname;
+    int flags;
 } FileContext;
 
 static const AVOption file_options[] = {
     { "truncate", "Truncate existing files on write", offsetof(FileContext, trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
+    { "fileloop", "loop / FIXME desc", offsetof(FileContext, loop), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
     { NULL }
 };
 
@@ -63,13 +67,6 @@ static const AVClass file_class = {
     .version    = LIBAVUTIL_VERSION_INT,
 };
 
-static int file_read(URLContext *h, unsigned char *buf, int size)
-{
-    FileContext *c = h->priv_data;
-    int r = read(c->fd, buf, size);
-    return (-1 == r)?AVERROR(errno):r;
-}
-
 static int file_write(URLContext *h, const unsigned char *buf, int size)
 {
     FileContext *c = h->priv_data;
@@ -105,6 +102,8 @@ static int file_open(URLContext *h, const char *filename, int flags)
     int fd;
     struct stat st;
 
+    c->fname = filename;
+    c->flags = flags;
     av_strstart(filename, "file:", &filename);
 
     if (flags & AVIO_FLAG_WRITE && flags & AVIO_FLAG_READ) {
@@ -127,6 +126,8 @@ static int file_open(URLContext *h, const char *filename, int flags)
     c->fd = fd;
 
     h->is_streamed = !fstat(fd, &st) && S_ISFIFO(st.st_mode);
+    if (c->loop)
+        h->is_streamed = 1;
 
     return 0;
 }
@@ -137,6 +138,8 @@ static int64_t file_seek(URLContext *h, int64_t pos, int whence)
     FileContext *c = h->priv_data;
     int64_t ret;
 
+    if (h->is_streamed)
+        return AVERROR(EINVAL);
     if (whence == AVSEEK_SIZE) {
         struct stat st;
         ret = fstat(c->fd, &st);
@@ -154,6 +157,18 @@ static int file_close(URLContext *h)
     return close(c->fd);
 }
 
+static int file_read(URLContext *h, unsigned char *buf, int size)
+{
+    FileContext *c = h->priv_data;
+    int r = read(c->fd, buf, size);
+    if (r == 0 && c->loop && c->flags & AVIO_FLAG_READ) {
+        file_close(h);
+        file_open(h, c->fname, c->flags);
+        r = file_read(h, buf, size);
+    }
+    return (-1 == r)?AVERROR(errno):r;
+}
+
 URLProtocol ff_file_protocol = {
     .name                = "file",
     .url_open            = file_open,
-- 
1.7.10.4