Signed-off-by: hwren <hwr...@126.com>
---
libavcodec/Makefile | 1 +
libavcodec/avs2_parser.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++
libavcodec/parser.c | 1 +
3 files changed, 97 insertions(+)
create mode 100644 libavcodec/avs2_parser.c
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 3ab071a..6b6d6de 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -994,6 +994,7 @@ OBJS-$(CONFIG_AAC_PARSER) += aac_parser.o
aac_ac3_parser.o \
mpeg4audio.o
OBJS-$(CONFIG_AC3_PARSER) += ac3tab.o aac_ac3_parser.o
OBJS-$(CONFIG_ADX_PARSER) += adx_parser.o adx.o
+OBJS-$(CONFIG_AVS2_PARSER) += avs2_parser.o
OBJS-$(CONFIG_BMP_PARSER) += bmp_parser.o
OBJS-$(CONFIG_CAVSVIDEO_PARSER) += cavs_parser.o
OBJS-$(CONFIG_COOK_PARSER) += cook_parser.o
diff --git a/libavcodec/avs2_parser.c b/libavcodec/avs2_parser.c
new file mode 100644
index 0000000..209b69e
--- /dev/null
+++ b/libavcodec/avs2_parser.c
@@ -0,0 +1,95 @@
+/*
+ * AVS2/IEEE 1857.4 video parser.
+ * Copyright (c) 2018 Huiwen Ren <hwr...@gmail.com>
+ *
+ * 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 "parser.h"
+
+#define SLICE_MAX_START_CODE 0x000001af
+
+#define ISPIC(x) ((x) == 0xB3 || (x) == 0xB6)
+#define ISUNIT(x) ((x) == 0xB0 || (x) == 0xB1 || (x) == 0xB2 || ISPIC(x))
+
+static int avs2_find_frame_end(ParseContext *pc, const uint8_t *buf, int
buf_size)
+{
+ int pic_found = pc->frame_start_found;
+ uint32_t state = pc->state;
+ int i = 0;
+
+ if (!pic_found) {
+ for (i = 0; i < buf_size; ++i) {
+ state = (state<<8) | buf[i];
+ if (ISUNIT(buf[i])){
+ ++i;
+ pic_found = 1;
+ break;
+ }
+ }
+ }
+
+ if (pic_found) {
+ if (!buf_size)
+ return END_NOT_FOUND;
+ for (; i < buf_size; ++i) {
+ state = (state << 8) | buf[i];
+ if ((state & 0xFFFFFF00) == 0x100 && state > SLICE_MAX_START_CODE)
{
+ pc->frame_start_found = 0;
+ pc->state = -1;
+ return i - 3;
+ }
+ }
+ }
+
+ pc->frame_start_found = pic_found;
+ pc->state = state;
+
+ return END_NOT_FOUND;
+}
+
+static int avs2_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 = avs2_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 ff_avs2_parser = {
+ .codec_ids = { AV_CODEC_ID_AVS2 },
+ .priv_data_size = sizeof(ParseContext),
+ .parser_parse = avs2_parse,
+ .parser_close = ff_parse_close,
+ .split = ff_mpeg4video_split,
+};
diff --git a/libavcodec/parser.c b/libavcodec/parser.c
index f43b197..7f8a451 100644
--- a/libavcodec/parser.c
+++ b/libavcodec/parser.c
@@ -37,6 +37,7 @@ extern AVCodecParser ff_aac_parser;
extern AVCodecParser ff_aac_latm_parser;
extern AVCodecParser ff_ac3_parser;
extern AVCodecParser ff_adx_parser;
+extern AVCodecParser ff_avs2_parser;
extern AVCodecParser ff_bmp_parser;
extern AVCodecParser ff_cavsvideo_parser;
extern AVCodecParser ff_cook_parser;
--
2.7.4
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