lavf/avs3dec: add raw avs3 demuxer

Signed-off-by: hbj <hanbj@pku.edu.cn>
Signed-off-by: hwren <hwrenx@126.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/libavformat/avs3dec.c b/libavformat/avs3dec.c
new file mode 100644
index 0000000000..253caa7c1d
--- /dev/null
+++ b/libavformat/avs3dec.c
@@ -0,0 +1,68 @@
+/*
+ * RAW AVS3-P2/IEEE1857.10 video demuxer
+ * Copyright (c) 2020 Zhenyu Wang <wangzhenyu@pkusz.edu.cn>
+ *                    Bingjie Han <hanbj@pkusz.edu.cn>
+ *                    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 "libavcodec/avs3.h"
+#include "libavcodec/internal.h"
+#include "avformat.h"
+#include "rawdec.h"
+
+static int avs3video_probe(const AVProbeData *p)
+{
+    const uint8_t *ptr = p->buf, *end = p->buf + p->buf_size;
+    uint32_t code = -1;
+    uint8_t state = 0;
+    int pic = 0, seq = 0, slice_pos = 0;
+    int ret = 0;
+
+    while (ptr < end) {
+        ptr = avpriv_find_start_code(ptr, end, &code);
+        state = code & 0xFF;
+        if ((code & 0xFFFFFF00) == 0x100) {
+            if (state < AVS3_SEQ_START_CODE) {
+                if (code < slice_pos)
+                    return 0;
+                slice_pos = code;
+            } else {
+                slice_pos = 0;
+            }
+            if (state == AVS3_SEQ_START_CODE) {
+                seq++;
+                if (*ptr != AVS3_PROFILE_BASELINE_MAIN && *ptr != AVS3_PROFILE_BASELINE_MAIN10)
+                    return 0;
+            } else if (AVS3_ISPIC(state)) {
+                pic++;
+            } else if ((state == AVS3_UNDEF_START_CODE) ||
+                       (state > AVS3_VIDEO_EDIT_CODE)) {
+                return 0;
+            }
+        }
+    }
+
+    if (seq && pic && av_match_ext(p->filename, "avs3")) {
+        ret = AVPROBE_SCORE_MAX;
+    }
+
+    return ret;
+}
+
+FF_DEF_RAWVIDEO_DEMUXER(avs3, "raw AVS3-P2/IEEE1857.10", avs3video_probe, "avs3", AV_CODEC_ID_AVS3)