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authorBaptiste Coudurier <baptiste.coudurier@gmail.com>2008-10-24 01:38:30 +0000
committerBaptiste Coudurier <baptiste.coudurier@gmail.com>2008-10-24 01:38:30 +0000
commitda396bf84e53ee5bd46c69df6511cd5cbfb73e7a (patch)
tree4b67552b8c21c2e252728cf0411c397eabc6f9db /libavcodec/dnxhd_parser.c
parent76e9fd01dde9764b66b8021f627149ed43a2de8a (diff)
downloadffmpeg-da396bf84e53ee5bd46c69df6511cd5cbfb73e7a.tar.gz
dnxhd parser
Originally committed as revision 15673 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/dnxhd_parser.c')
-rw-r--r--libavcodec/dnxhd_parser.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/libavcodec/dnxhd_parser.c b/libavcodec/dnxhd_parser.c
new file mode 100644
index 0000000000..b527913108
--- /dev/null
+++ b/libavcodec/dnxhd_parser.c
@@ -0,0 +1,95 @@
+/*
+ * DNxHD/VC-3 parser
+ * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
+ *
+ * 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
+ */
+
+/**
+ * @file dnxhd_parser.c
+ * DNxHD/VC-3 parser
+ */
+
+#include "parser.h"
+
+#define DNXHD_HEADER_PREFIX 0x0000028001
+
+static int dnxhd_find_frame_end(ParseContext *pc,
+ const uint8_t *buf, int buf_size)
+{
+ uint64_t state = pc->state64;
+ int pic_found = pc->frame_start_found;
+ int i = 0;
+
+ if (!pic_found) {
+ for (i = 0; i < buf_size; i++) {
+ state = (state<<8) | buf[i];
+ if ((state & 0xffffffffffLL) == DNXHD_HEADER_PREFIX) {
+ i++;
+ pic_found = 1;
+ break;
+ }
+ }
+ }
+
+ if (pic_found) {
+ if (!buf_size) /* EOF considered as end of frame */
+ return 0;
+ for (; i < buf_size; i++) {
+ state = (state<<8) | buf[i];
+ if ((state & 0xffffffffffLL) == DNXHD_HEADER_PREFIX) {
+ pc->frame_start_found = 0;
+ pc->state64 = -1;
+ return i-4;
+ }
+ }
+ }
+ pc->frame_start_found = pic_found;
+ pc->state64 = state;
+ return END_NOT_FOUND;
+}
+
+static int dnxhd_parse(AVCodecParserContext *s,
+ AVCodecContext *avctx,
+ const uint8_t **poutbuf, int *poutbuf_size,
+ const uint8_t *buf, int buf_size)
+{
+ ParseContext *pc = s->priv_data;
+ int next;
+
+ if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
+ next = buf_size;
+ } else {
+ next = dnxhd_find_frame_end(pc, buf, buf_size);
+ if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
+ *poutbuf = NULL;
+ *poutbuf_size = 0;
+ return buf_size;
+ }
+ }
+ *poutbuf = buf;
+ *poutbuf_size = buf_size;
+ return next;
+}
+
+AVCodecParser dnxhd_parser = {
+ { CODEC_ID_DNXHD },
+ sizeof(ParseContext),
+ NULL,
+ dnxhd_parse,
+ ff_parse_close,
+};