1 files changed, 67 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavformat/crcenc.c b/contrib/ffmpeg/libavformat/crcenc.c
new file mode 100644
index 000000000..dd8803161
--- /dev/null
+++ b/contrib/ffmpeg/libavformat/crcenc.c
@@ -0,0 +1,67 @@
+/*
+ * 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 "avformat.h"
+#include "adler32.h"
+
+typedef struct CRCState {
+    uint32_t crcval;
+} CRCState;
+
+static int crc_write_header(struct AVFormatContext *s)
+{
+    CRCState *crc = s->priv_data;
+
+    /* init CRC */
+    crc->crcval = 1;
+
+    return 0;
+}
+
+static int crc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
+{
+    CRCState *crc = s->priv_data;
+    crc->crcval = av_adler32_update(crc->crcval, pkt->data, pkt->size);
+    return 0;
+}
+
+static int crc_write_trailer(struct AVFormatContext *s)
+{
+    CRCState *crc = s->priv_data;
+    char buf[64];
+
+    snprintf(buf, sizeof(buf), "CRC=0x%08x\n", crc->crcval);
+    put_buffer(s->pb, buf, strlen(buf));
+    put_flush_packet(s->pb);
+    return 0;
+}
+
+AVOutputFormat crc_muxer = {
+    "crc",
+    "crc testing format",
+    NULL,
+    "",
+    sizeof(CRCState),
+    CODEC_ID_PCM_S16LE,
+    CODEC_ID_RAWVIDEO,
+    crc_write_header,
+    crc_write_packet,
+    crc_write_trailer,
+};