2 * VP9 compatible video decoder
4 * Copyright (C) 2013 Ronald S. Bultje <rsbultje gmail com>
5 * Copyright (C) 2013 Clément Bœsch <u pkh me>
7 * This file is part of FFmpeg.
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include "libavutil/intreadwrite.h"
25 #include "libavcodec/get_bits.h"
28 typedef struct VP9ParseContext {
34 static int parse_frame(AVCodecParserContext *ctx, const uint8_t *buf, int size)
36 VP9ParseContext *s = ctx->priv_data;
38 int res, profile, keyframe, invisible;
40 if ((res = init_get_bits8(&gb, buf, size)) < 0)
42 get_bits(&gb, 2); // frame marker
43 profile = get_bits1(&gb);
44 profile |= get_bits1(&gb) << 1;
45 if (profile == 3) profile += get_bits1(&gb);
51 keyframe = !get_bits1(&gb);
52 invisible = !get_bits1(&gb);
56 ctx->pict_type = AV_PICTURE_TYPE_P;
59 ctx->pict_type = AV_PICTURE_TYPE_I;
64 if (ctx->pts == AV_NOPTS_VALUE)
66 s->pts = AV_NOPTS_VALUE;
69 ctx->pts = AV_NOPTS_VALUE;
75 static int parse(AVCodecParserContext *ctx,
76 AVCodecContext *avctx,
77 const uint8_t **out_data, int *out_size,
78 const uint8_t *data, int size)
80 VP9ParseContext *s = ctx->priv_data;
91 if (s->n_frames > 0) {
93 *out_size = s->size[--s->n_frames];
94 parse_frame(ctx, *out_data, *out_size);
96 return s->n_frames > 0 ? *out_size : size /* i.e. include idx tail */;
99 marker = data[size - 1];
100 if ((marker & 0xe0) == 0xc0) {
101 int nbytes = 1 + ((marker >> 3) & 0x3);
102 int n_frames = 1 + (marker & 0x7), idx_sz = 2 + n_frames * nbytes;
104 if (size >= idx_sz && data[size - idx_sz] == marker) {
105 const uint8_t *idx = data + size + 1 - idx_sz;
109 #define case_n(a, rd) \
111 while (n_frames--) { \
118 av_log(avctx, AV_LOG_ERROR, \
119 "Superframe packet size too big: %u > %d\n", \
127 s->n_frames = n_frames; \
129 s->size[n_frames] = sz; \
134 parse_frame(ctx, *out_data, *out_size); \
138 case_n(2, AV_RL16(idx));
139 case_n(3, AV_RL24(idx));
140 case_n(4, AV_RL32(idx));
147 parse_frame(ctx, data, size);
152 AVCodecParser ff_vp9_parser = {
153 .codec_ids = { AV_CODEC_ID_VP9 },
154 .priv_data_size = sizeof(VP9ParseContext),
155 .parser_parse = parse,