[FFmpeg-cvslog] r23196 - in trunk/libavcodec: Makefile allcodecs.c chomp_bsf.c

[alexc]

Author: alexc
Date: Wed May 19 22:18:40 2010
New Revision: 23196

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

Added:
   trunk/libavcodec/chomp_bsf.c
Modified:
   trunk/libavcodec/Makefile
   trunk/libavcodec/allcodecs.c

Modified: trunk/libavcodec/Makefile
==============================================================================
--- trunk/libavcodec/Makefile	Wed May 19 22:18:34 2010	(r23195)
+++ trunk/libavcodec/Makefile	Wed May 19 22:18:40 2010	(r23196)
@@ -577,6 +577,7 @@ OBJS-$(CONFIG_VP3_PARSER)              +
 
 # bitstream filters
 OBJS-$(CONFIG_AAC_ADTSTOASC_BSF)          += aac_adtstoasc_bsf.o
+OBJS-$(CONFIG_CHOMP_BSF)                  += chomp_bsf.o
 OBJS-$(CONFIG_DUMP_EXTRADATA_BSF)         += dump_extradata_bsf.o
 OBJS-$(CONFIG_H264_MP4TOANNEXB_BSF)       += h264_mp4toannexb_bsf.o
 OBJS-$(CONFIG_IMX_DUMP_HEADER_BSF)        += imx_dump_header_bsf.o

Modified: trunk/libavcodec/allcodecs.c
==============================================================================
--- trunk/libavcodec/allcodecs.c	Wed May 19 22:18:34 2010	(r23195)
+++ trunk/libavcodec/allcodecs.c	Wed May 19 22:18:40 2010	(r23196)
@@ -375,6 +375,7 @@ void avcodec_register_all(void)
 
     /* bitstream filters */
     REGISTER_BSF     (AAC_ADTSTOASC, aac_adtstoasc);
+    REGISTER_BSF     (CHOMP, chomp);
     REGISTER_BSF     (DUMP_EXTRADATA, dump_extradata);
     REGISTER_BSF     (H264_MP4TOANNEXB, h264_mp4toannexb);
     REGISTER_BSF     (IMX_DUMP_HEADER, imx_dump_header);

Added: trunk/libavcodec/chomp_bsf.c
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ trunk/libavcodec/chomp_bsf.c	Wed May 19 22:18:40 2010	(r23196)
@@ -0,0 +1,47 @@
+/*
+ * Chomp bitstream filter
+ * Copyright (c) 2010 Alex Converse <alex.converse at 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,
+};