diff mbox

[FFmpeg-devel,v6,3/4] lavc: add avs2 parser

Message ID 1530591729-7202-3-git-send-email-hwrenx@126.com
State Superseded
Headers show

Commit Message

hwren July 3, 2018, 4:22 a.m. UTC 
Signed-off-by: hwren <hwrenx@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 mbox

Patch

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 <hwrenx@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;