lavc: Add coded bitstream read/write support for H.264

(cherry picked from commit acf06f45441be24c5cbae0920579cd69427326a1)
(cherry picked from commit 768eb9182e94a94bc2ef46f565a0dac7afef3b57)
(cherry picked from commit e7f64191b27bcf37cbf7006606f0f439c6cdc24f)

1 files changed, 43 insertions, 0 deletions

diff --git a/libavcodec/cbs_h2645.h b/libavcodec/cbs_h2645.h
new file mode 100644
index 0000000000..f4cf65bdde
--- /dev/null
+++ b/libavcodec/cbs_h2645.h
@@ -0,0 +1,43 @@
+/*
+ * 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
+ */
+
+#ifndef AVCODEC_CBS_H2645_H
+#define AVCODEC_CBS_H2645_H
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "h2645_parse.h"
+
+
+typedef struct CodedBitstreamH2645Context {
+    // If set, the stream being read is in MP4 (AVCC/HVCC) format.  If not
+    // set, the stream is assumed to be in annex B format.
+    int mp4;
+    // Size in bytes of the NAL length field for MP4 format.
+    int nal_length_size;
+    // Packet reader.
+    H2645Packet read_packet;
+
+    // Write buffer
+    uint8_t *write_buffer;
+    size_t write_buffer_size;
+} CodedBitstreamH2645Context;
+
+
+#endif /* AVCODEC_CBS_H2645_H */