| /* |
| * 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; |
| } |
| |
| AVCodecParser ff_vp9_parser = { |
| .codec_ids = { AV_CODEC_ID_VP9 }, |
| .parser_parse = parse, |
| }; |