gistfile1.patch

From c20276eddba27e17006385ed8c65974c1764642d Mon Sep 17 00:00:00 2001
From: Yannick Kechlin <yannick.koechlin@gmail.com
Date: Sun, 14 Mar 2010 17:03:24 +0100
Subject: [PATCH] sha1 checksum for media data analogous to crc


Signed-off-by: Yannick Kechlin <yannick.koechlin@gmail.com>
---
 libavformat/Makefile     |    1 +
 libavformat/allformats.c |    1 +
 libavformat/shaenc.c     |   83 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 85 insertions(+), 0 deletions(-)
 create mode 100755 libavformat/shaenc.c

diff --git a/libavformat/Makefile b/libavformat/Makefile
index dcf4ed8..dd29756 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -212,6 +212,7 @@ OBJS-$(CONFIG_RTP_MUXER)                 += rtp.o         \
                                             avc.o
 OBJS-$(CONFIG_RTSP_DEMUXER)              += rtsp.o
 OBJS-$(CONFIG_RTSP_MUXER)                += rtsp.o rtspenc.o
+OBJS-$(CONFIG_SHA_MUXER)                 += shaenc.o
 OBJS-$(CONFIG_SDP_DEMUXER)               += rtsp.o        \
                                             rdt.o         \
                                             rtp.o         \
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 090d134..2a464fb 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -173,6 +173,7 @@ void av_register_all(void)
     REGISTER_DEMUXER  (RPL, rpl);
     REGISTER_MUXER    (RTP, rtp);
     REGISTER_MUXDEMUX (RTSP, rtsp);
+	REGISTER_MUXER    (SHA, sha);
     REGISTER_DEMUXER  (SDP, sdp);
 #if CONFIG_SDP_DEMUXER
     av_register_rtp_dynamic_payload_handlers();
diff --git a/libavformat/shaenc.c b/libavformat/shaenc.c
new file mode 100755
index 0000000..b14d4b2
--- /dev/null
+++ b/libavformat/shaenc.c
@@ -0,0 +1,83 @@
+/*
+ * CRC encoder (for codec/format testing)
+ * Copyright (c) 2002 Fabrice Bellard
+ *
+ * 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 "libavutil/sha.h"
+#include "avformat.h"
+
+typedef struct CRCState {
+    uint32_t crcval;
+} CRCState;
+
+struct AVSHA *avshactx;
+
+
+static int sha_write_header(struct AVFormatContext *s)
+{
+
+	avshactx = av_mallocz(av_sha_size);
+	av_sha_init(avshactx, 160);
+	
+    CRCState *crc = s->priv_data;
+
+    /* init CRC */
+    crc->crcval = 1;
+
+    return 0;
+}
+
+static int sha_write_packet(struct AVFormatContext *s, AVPacket *pkt)
+{
+    CRCState *crc = s->priv_data;
+    av_sha_update(avshactx,pkt->data, pkt->size);
+    return 0;
+}
+
+static int sha_write_trailer(struct AVFormatContext *s)
+{
+    CRCState *crc = s->priv_data;
+    char buf[64];
+    unsigned char avsha1[20];
+
+	av_sha_final(avshactx, &avsha1);
+	
+ 	snprintf(buf, sizeof(buf), "\nSHA=");
+	int i;
+	for (i = 0; i < 20; i++) {
+	    snprintf(buf+5+(i*2), sizeof(buf), "%02x", avsha1[i]);
+	}
+//	snprintf(buf+46, sizeof(buf), "\n");
+    put_buffer(s->pb, buf, strlen(buf));
+    put_flush_packet(s->pb);
+    return 0;
+}
+
+AVOutputFormat sha_muxer = {
+    "sha",
+    NULL_IF_CONFIG_SMALL("SHA testing format"),
+    NULL,
+    "",
+    sizeof(CRCState),
+    CODEC_ID_PCM_S16LE,
+    CODEC_ID_RAWVIDEO,
+    sha_write_header,
+    sha_write_packet,
+    sha_write_trailer,
+};
-- 
1.7.0