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authorDiego Biurrun <diego@biurrun.de>2008-05-03 03:33:21 +0000
committerDiego Biurrun <diego@biurrun.de>2008-05-03 03:33:21 +0000
commit575e696ce4f34e0d681066f79291e167b8c062c3 (patch)
treeea0c5084318e92cb24ffd3915df933c3d0595286
parentfde8052e4e5ddd2a75f1d4d395a0991fe939d49c (diff)
downloadffmpeg-575e696ce4f34e0d681066f79291e167b8c062c3.tar.gz
Add Dirac parser from SoC; written by Marco Gerards;
submitted by Anuradha Suraparaju, anuradha rd.bbc.co uk Originally committed as revision 13041 to svn://svn.ffmpeg.org/ffmpeg/trunk
-rw-r--r--libavcodec/Makefile1
-rw-r--r--libavcodec/allcodecs.c1
-rw-r--r--libavcodec/dirac_parser.c88
3 files changed, 90 insertions, 0 deletions
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 93ebee2bc2..e18511bfd9 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -333,6 +333,7 @@ OBJS-$(CONFIG_AAC_PARSER) += aac_parser.o aac_ac3_parser.o mpeg4aud
OBJS-$(CONFIG_AC3_PARSER) += ac3_parser.o ac3tab.o aac_ac3_parser.o
OBJS-$(CONFIG_CAVSVIDEO_PARSER) += cavs_parser.o
OBJS-$(CONFIG_DCA_PARSER) += dca_parser.o
+OBJS-$(CONFIG_DIRAC_PARSER) += dirac_parser.o
OBJS-$(CONFIG_DVBSUB_PARSER) += dvbsub_parser.o
OBJS-$(CONFIG_DVDSUB_PARSER) += dvdsub_parser.o
OBJS-$(CONFIG_H261_PARSER) += h261_parser.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 0e6c4273ba..548522ac24 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -292,6 +292,7 @@ void avcodec_register_all(void)
REGISTER_PARSER (AC3, ac3);
REGISTER_PARSER (CAVSVIDEO, cavsvideo);
REGISTER_PARSER (DCA, dca);
+ REGISTER_PARSER (DIRAC, dirac);
REGISTER_PARSER (DVBSUB, dvbsub);
REGISTER_PARSER (DVDSUB, dvdsub);
REGISTER_PARSER (H261, h261);
diff --git a/libavcodec/dirac_parser.c b/libavcodec/dirac_parser.c
new file mode 100644
index 0000000000..199354a9c6
--- /dev/null
+++ b/libavcodec/dirac_parser.c
@@ -0,0 +1,88 @@
+/*
+ * Dirac parser
+ *
+ * Copyright (c) 2007 Marco Gerards <marco@gnu.org>
+ *
+ * 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 dirac_parser.c
+ * Dirac Parser
+ * @author Marco Gerards <marco@gnu.org>
+ */
+
+#include "parser.h"
+
+#define DIRAC_PARSE_INFO_PREFIX 0x42424344
+
+/**
+ * Finds the end of the current frame in the bitstream.
+ * @return the position of the first byte of the next frame or -1
+ */
+static int find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
+{
+ uint32_t state = pc->state;
+ int i;
+
+ for (i = 0; i < buf_size; i++) {
+ state = (state << 8) | buf[i];
+ if (state == DIRAC_PARSE_INFO_PREFIX) {
+ pc->frame_start_found ^= 1;
+ if (!pc->frame_start_found) {
+ pc->state = -1;
+ return i - 3;
+ }
+ }
+ }
+
+ pc->state = state;
+
+ return END_NOT_FOUND;
+}
+
+static int dirac_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 = 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 dirac_parser = {
+ { CODEC_ID_DIRAC },
+ sizeof(ParseContext),
+ NULL,
+ dirac_parse,
+ ff_parse_close,
+};