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-rw-r--r--media/ffvpx/libavcodec/vp9_parser.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/vp9_parser.c b/media/ffvpx/libavcodec/vp9_parser.c
new file mode 100644
index 0000000000..ffcb93505f
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+++ b/media/ffvpx/libavcodec/vp9_parser.c
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+/*
+ * VP9 compatible video decoder
+ *
+ * Copyright (C) 2013 Ronald S. Bultje <rsbultje gmail com>
+ * Copyright (C) 2013 Clément Bœsch <u pkh me>
+ *
+ * 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 "libavutil/intreadwrite.h"
+#include "libavcodec/get_bits.h"
+#include "parser.h"
+
+static int parse(AVCodecParserContext *ctx,
+ AVCodecContext *avctx,
+ const uint8_t **out_data, int *out_size,
+ const uint8_t *data, int size)
+{
+ GetBitContext gb;
+ int res, profile, keyframe;
+
+ *out_data = data;
+ *out_size = size;
+
+ if (!size || (res = init_get_bits8(&gb, data, size)) < 0)
+ return size; // parsers can't return errors
+ get_bits(&gb, 2); // frame marker
+ profile = get_bits1(&gb);
+ profile |= get_bits1(&gb) << 1;
+ if (profile == 3) profile += get_bits1(&gb);
+ if (profile > 3)
+ return size;
+
+ avctx->profile = profile;
+
+ if (get_bits1(&gb)) {
+ keyframe = 0;
+ } else {
+ keyframe = !get_bits1(&gb);
+ }
+
+ if (!keyframe) {
+ ctx->pict_type = AV_PICTURE_TYPE_P;
+ ctx->key_frame = 0;
+ } else {
+ ctx->pict_type = AV_PICTURE_TYPE_I;
+ ctx->key_frame = 1;
+ }
+
+ return size;
+}
+
+const AVCodecParser ff_vp9_parser = {
+ .codec_ids = { AV_CODEC_ID_VP9 },
+ .parser_parse = parse,
+};