2 * Copyright (c) 2016 Google Inc.
3 * Copyright (c) 2016 KongQun Yang (kqyang@google.com)
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/pixdesc.h"
23 #include "libavutil/pixfmt.h"
26 enum VPX_CHROMA_SUBSAMPLING
28 VPX_SUBSAMPLING_420_VERTICAL = 0,
29 VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA = 1,
30 VPX_SUBSAMPLING_422 = 2,
31 VPX_SUBSAMPLING_444 = 3,
34 static int get_vpx_chroma_subsampling(AVFormatContext *s,
35 enum AVPixelFormat pixel_format,
36 enum AVChromaLocation chroma_location)
38 int chroma_w, chroma_h;
39 if (av_pix_fmt_get_chroma_sub_sample(pixel_format, &chroma_w, &chroma_h) == 0) {
40 if (chroma_w == 1 && chroma_h == 1) {
41 return (chroma_location == AVCHROMA_LOC_LEFT)
42 ? VPX_SUBSAMPLING_420_VERTICAL
43 : VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA;
44 } else if (chroma_w == 1 && chroma_h == 0) {
45 return VPX_SUBSAMPLING_422;
46 } else if (chroma_w == 0 && chroma_h == 0) {
47 return VPX_SUBSAMPLING_444;
50 av_log(s, AV_LOG_ERROR, "Unsupported pixel format (%d)\n", pixel_format);
54 static int get_bit_depth(AVFormatContext *s, enum AVPixelFormat pixel_format)
56 const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pixel_format);
58 av_log(s, AV_LOG_ERROR, "Unsupported pixel format (%d)\n",
62 return desc->comp[0].depth;
65 static int get_vpx_video_full_range_flag(enum AVColorRange color_range)
67 return color_range == AVCOL_RANGE_JPEG;
70 int ff_isom_write_vpcc(AVFormatContext *s, AVIOContext *pb,
71 AVCodecParameters *par)
73 int profile = par->profile;
74 int level = par->level == FF_LEVEL_UNKNOWN ? 0 : par->level;
75 int bit_depth = get_bit_depth(s, par->format);
76 int vpx_chroma_subsampling =
77 get_vpx_chroma_subsampling(s, par->format, par->chroma_location);
78 int vpx_video_full_range_flag =
79 get_vpx_video_full_range_flag(par->color_range);
81 if (bit_depth < 0 || vpx_chroma_subsampling < 0)
82 return AVERROR_INVALIDDATA;
84 if (profile == FF_PROFILE_UNKNOWN) {
85 if (vpx_chroma_subsampling == VPX_SUBSAMPLING_420_VERTICAL ||
86 vpx_chroma_subsampling == VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA) {
87 profile = (bit_depth == 8) ? FF_PROFILE_VP9_0 : FF_PROFILE_VP9_2;
89 profile = (bit_depth == 8) ? FF_PROFILE_VP9_1 : FF_PROFILE_VP9_3;
95 avio_w8(pb, (bit_depth << 4) | (vpx_chroma_subsampling << 1) | vpx_video_full_range_flag);
96 avio_w8(pb, par->color_primaries);
97 avio_w8(pb, par->color_trc);
98 avio_w8(pb, par->color_space);
100 // vp9 does not have codec initialization data.