Add a chomp BSF to consume zero padding at the end of a packet.

Originally committed as revision 23196 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 47 insertions, 0 deletions

diff --git a/libavcodec/chomp_bsf.c b/libavcodec/chomp_bsf.c
new file mode 100644
index 0000000000..caf1ff9ac4
--- /dev/null
+++ b/libavcodec/chomp_bsf.c
@@ -0,0 +1,47 @@
+/*
+ * Chomp bitstream filter
+ * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
+ *
+ * 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 "avcodec.h"
+#include "internal.h"
+
+static int chomp_filter(AVBitStreamFilterContext *bsfc,
+                        AVCodecContext *avctx, const char *args,
+                        uint8_t  **poutbuf, int *poutbuf_size,
+                        const uint8_t *buf, int      buf_size,
+                        int keyframe)
+{
+    while (buf_size > 0 && !buf[buf_size-1])
+        buf_size--;
+
+    *poutbuf = (uint8_t*) buf;
+    *poutbuf_size = buf_size;
+
+    return 0;
+}
+
+/**
+ * This filter removes a string of \0 bytes from the end of a packet.
+ */
+AVBitStreamFilter chomp_bsf = {
+    "chomp",
+    0,
+    chomp_filter,
+};