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https://github.com/FFmpeg/FFmpeg.git
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64ad44a381
This brings our generation of the vpcC box up to date to version 1.0 of the VP Codec ISO Media File Format Binding. Specifically, color/transfer properties are now written with values based on ISO/IEC 23001-8, which is the same reference specification the AVColor* enumerations are based on.
104 lines
3.6 KiB
C
104 lines
3.6 KiB
C
/*
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* Copyright (c) 2016 Google Inc.
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* Copyright (c) 2016 KongQun Yang (kqyang@google.com)
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/pixdesc.h"
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#include "libavutil/pixfmt.h"
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#include "vpcc.h"
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enum VPX_CHROMA_SUBSAMPLING
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{
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VPX_SUBSAMPLING_420_VERTICAL = 0,
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VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA = 1,
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VPX_SUBSAMPLING_422 = 2,
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VPX_SUBSAMPLING_444 = 3,
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};
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static int get_vpx_chroma_subsampling(AVFormatContext *s,
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enum AVPixelFormat pixel_format,
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enum AVChromaLocation chroma_location)
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{
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int chroma_w, chroma_h;
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if (av_pix_fmt_get_chroma_sub_sample(pixel_format, &chroma_w, &chroma_h) == 0) {
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if (chroma_w == 1 && chroma_h == 1) {
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return (chroma_location == AVCHROMA_LOC_LEFT)
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? VPX_SUBSAMPLING_420_VERTICAL
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: VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA;
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} else if (chroma_w == 1 && chroma_h == 0) {
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return VPX_SUBSAMPLING_422;
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} else if (chroma_w == 0 && chroma_h == 0) {
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return VPX_SUBSAMPLING_444;
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}
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}
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av_log(s, AV_LOG_ERROR, "Unsupported pixel format (%d)\n", pixel_format);
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return -1;
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}
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static int get_bit_depth(AVFormatContext *s, enum AVPixelFormat pixel_format)
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{
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pixel_format);
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if (desc == NULL) {
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av_log(s, AV_LOG_ERROR, "Unsupported pixel format (%d)\n",
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pixel_format);
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return -1;
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}
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return desc->comp[0].depth;
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}
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static int get_vpx_video_full_range_flag(enum AVColorRange color_range)
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{
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return color_range == AVCOL_RANGE_JPEG;
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}
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int ff_isom_write_vpcc(AVFormatContext *s, AVIOContext *pb,
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AVCodecParameters *par)
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{
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int profile = par->profile;
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int level = par->level == FF_LEVEL_UNKNOWN ? 0 : par->level;
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int bit_depth = get_bit_depth(s, par->format);
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int vpx_chroma_subsampling =
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get_vpx_chroma_subsampling(s, par->format, par->chroma_location);
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int vpx_video_full_range_flag =
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get_vpx_video_full_range_flag(par->color_range);
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if (bit_depth < 0 || vpx_chroma_subsampling < 0)
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return AVERROR_INVALIDDATA;
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if (profile == FF_PROFILE_UNKNOWN) {
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if (vpx_chroma_subsampling == VPX_SUBSAMPLING_420_VERTICAL ||
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vpx_chroma_subsampling == VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA) {
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profile = (bit_depth == 8) ? FF_PROFILE_VP9_0 : FF_PROFILE_VP9_2;
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} else {
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profile = (bit_depth == 8) ? FF_PROFILE_VP9_1 : FF_PROFILE_VP9_3;
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}
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}
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avio_w8(pb, profile);
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avio_w8(pb, level);
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avio_w8(pb, (bit_depth << 4) | (vpx_chroma_subsampling << 1) | vpx_video_full_range_flag);
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avio_w8(pb, par->color_primaries);
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avio_w8(pb, par->color_trc);
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avio_w8(pb, par->color_space);
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// vp9 does not have codec initialization data.
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avio_wb16(pb, 0);
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return 0;
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}
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