move noise bitstream filter in its own file

Originally committed as revision 9064 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 46 insertions, 0 deletions

diff --git a/libavcodec/noise_bsf.c b/libavcodec/noise_bsf.c
new file mode 100644
index 0000000000..6085a5bba4
--- /dev/null
+++ b/libavcodec/noise_bsf.c
@@ -0,0 +1,46 @@
+/*
+ * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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"
+
+
+static int noise(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
+                     uint8_t **poutbuf, int *poutbuf_size,
+                     const uint8_t *buf, int buf_size, int keyframe){
+    int amount= args ? atoi(args) : 10000;
+    unsigned int *state= bsfc->priv_data;
+    int i;
+
+    *poutbuf= av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
+
+    memcpy(*poutbuf, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
+    for(i=0; i<buf_size; i++){
+        (*state) += (*poutbuf)[i] + 1;
+        if(*state % amount == 0)
+            (*poutbuf)[i] = *state;
+    }
+    return 1;
+}
+
+AVBitStreamFilter noise_bsf={
+    "noise",
+    sizeof(int),
+    noise,
+};