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"
27 typedef struct VP9ParseContext {
33 static void parse_frame(AVCodecParserContext *ctx, const uint8_t *buf, int size)
35 VP9ParseContext *s = ctx->priv_data;
38 ctx->pict_type = AV_PICTURE_TYPE_P;
41 ctx->pict_type = AV_PICTURE_TYPE_I;
46 if (ctx->pts == AV_NOPTS_VALUE)
48 s->pts = AV_NOPTS_VALUE;
51 ctx->pts = AV_NOPTS_VALUE;
55 static int parse(AVCodecParserContext *ctx,
56 AVCodecContext *avctx,
57 const uint8_t **out_data, int *out_size,
58 const uint8_t *data, int size)
60 VP9ParseContext *s = ctx->priv_data;
71 if (s->n_frames > 0) {
73 *out_size = s->size[--s->n_frames];
74 parse_frame(ctx, *out_data, *out_size);
76 return s->n_frames > 0 ? *out_size : size /* i.e. include idx tail */;
79 marker = data[size - 1];
80 if ((marker & 0xe0) == 0xc0) {
81 int nbytes = 1 + ((marker >> 3) & 0x3);
82 int n_frames = 1 + (marker & 0x7), idx_sz = 2 + n_frames * nbytes;
84 if (size >= idx_sz && data[size - idx_sz] == marker) {
85 const uint8_t *idx = data + size + 1 - idx_sz;
89 #define case_n(a, rd) \
91 while (n_frames--) { \
98 av_log(avctx, AV_LOG_ERROR, \
99 "Superframe packet size too big: %u > %d\n", \
107 s->n_frames = n_frames; \
109 s->size[n_frames] = sz; \
114 parse_frame(ctx, *out_data, *out_size); \
118 case_n(2, AV_RL16(idx));
119 case_n(3, AV_RL24(idx));
120 case_n(4, AV_RL32(idx));
127 parse_frame(ctx, data, size);
132 AVCodecParser ff_vp9_parser = {
133 .codec_ids = { AV_CODEC_ID_VP9 },
134 .priv_data_size = sizeof(VP9ParseContext),
135 .parser_parse = parse,