Hi,
patch attached.
From 9105f16ae41a49cf3f914a768a10959b2c4ba70e Mon Sep 17 00:00:00 2001
From: Paul B Mahol <one...@gmail.com>
Date: Sun, 27 Mar 2016 13:02:33 +0200
Subject: [PATCH] avcodec: add dca core extraction bsf
Signed-off-by: Paul B Mahol <one...@gmail.com>
---
libavcodec/Makefile | 1 +
libavcodec/allcodecs.c | 1 +
libavcodec/dca_core_bsf.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 62 insertions(+)
create mode 100644 libavcodec/dca_core_bsf.c
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index b926b79..8c14268 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -924,6 +924,7 @@ OBJS-$(CONFIG_AAC_ADTSTOASC_BSF) += aac_adtstoasc_bsf.o aacadtsdec.o \
mpeg4audio.o
OBJS-$(CONFIG_CHOMP_BSF) += chomp_bsf.o
OBJS-$(CONFIG_DUMP_EXTRADATA_BSF) += dump_extradata_bsf.o
+OBJS-$(CONFIG_DCA_CORE_BSF) += dca_core_bsf.o
OBJS-$(CONFIG_H264_MP4TOANNEXB_BSF) += h264_mp4toannexb_bsf.o
OBJS-$(CONFIG_HEVC_MP4TOANNEXB_BSF) += hevc_mp4toannexb_bsf.o
OBJS-$(CONFIG_IMX_DUMP_HEADER_BSF) += imx_dump_header_bsf.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index e3c4f07..f498041 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -670,6 +670,7 @@ void avcodec_register_all(void)
REGISTER_BSF(AAC_ADTSTOASC, aac_adtstoasc);
REGISTER_BSF(CHOMP, chomp);
REGISTER_BSF(DUMP_EXTRADATA, dump_extradata);
+ REGISTER_BSF(DCA_CORE, dca_core);
REGISTER_BSF(H264_MP4TOANNEXB, h264_mp4toannexb);
REGISTER_BSF(HEVC_MP4TOANNEXB, hevc_mp4toannexb);
REGISTER_BSF(IMX_DUMP_HEADER, imx_dump_header);
diff --git a/libavcodec/dca_core_bsf.c b/libavcodec/dca_core_bsf.c
new file mode 100644
index 0000000..7d37236
--- /dev/null
+++ b/libavcodec/dca_core_bsf.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2016 Paul B Mahol
+ *
+ * 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 "bytestream.h"
+#include "dca_syncwords.h"
+#include "libavutil/mem.h"
+
+static int dca_core(AVBitStreamFilterContext *bsfc,
+ AVCodecContext *avctx, const char *args,
+ uint8_t **poutbuf, int *poutbuf_size,
+ const uint8_t *buf, int buf_size,
+ int keyframe)
+{
+ GetByteContext gb;
+ uint32_t syncword;
+ int core_size = 0;
+
+ bytestream2_init(&gb, buf, buf_size);
+ syncword = bytestream2_get_be32(&gb);
+ bytestream2_skip(&gb, 1);
+
+ switch (syncword) {
+ case DCA_SYNCWORD_CORE_BE:
+ core_size = ((bytestream2_get_be24(&gb) >> 4) & 0x3fff) + 1;
+ break;
+ }
+
+ *poutbuf = (uint8_t *)buf;
+
+ if (core_size > 0 && core_size <= buf_size) {
+ *poutbuf_size = core_size;
+ } else {
+ *poutbuf_size = buf_size;
+ }
+
+ return 0;
+}
+
+AVBitStreamFilter ff_dca_core_bsf = {
+ .name = "dca_core",
+ .filter = dca_core,
+};
--
1.9.1
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