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/*
* Copyright (c) 2016 Google Inc.
* Copyright (c) 2016 KongQun Yang (kqyang@google.com)
*
* 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/pixdesc.h"
#include "libavutil/pixfmt.h"
#include "vpcc.h"
enum VPX_CHROMA_SUBSAMPLING
{
VPX_SUBSAMPLING_420_VERTICAL = 0,
VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA = 1,
VPX_SUBSAMPLING_422 = 2,
VPX_SUBSAMPLING_444 = 3,
};
static int get_vpx_chroma_subsampling(AVFormatContext *s,
enum AVPixelFormat pixel_format,
enum AVChromaLocation chroma_location)
{
int chroma_w, chroma_h;
if (av_pix_fmt_get_chroma_sub_sample(pixel_format, &chroma_w, &chroma_h) == 0) {
if (chroma_w == 1 && chroma_h == 1) {
return (chroma_location == AVCHROMA_LOC_LEFT)
? VPX_SUBSAMPLING_420_VERTICAL
: VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA;
} else if (chroma_w == 1 && chroma_h == 0) {
return VPX_SUBSAMPLING_422;
} else if (chroma_w == 0 && chroma_h == 0) {
return VPX_SUBSAMPLING_444;
}
}
av_log(s, AV_LOG_ERROR, "Unsupported pixel format (%d)\n", pixel_format);
return -1;
}
static int get_bit_depth(AVFormatContext *s, enum AVPixelFormat pixel_format)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pixel_format);
if (desc == NULL) {
av_log(s, AV_LOG_ERROR, "Unsupported pixel format (%d)\n",
pixel_format);
return -1;
}
return desc->comp[0].depth;
}
static int get_vpx_video_full_range_flag(enum AVColorRange color_range)
{
return color_range == AVCOL_RANGE_JPEG;
}
int ff_isom_write_vpcc(AVFormatContext *s, AVIOContext *pb,
AVCodecParameters *par)
{
int profile = par->profile;
int level = par->level == FF_LEVEL_UNKNOWN ? 0 : par->level;
int bit_depth = get_bit_depth(s, par->format);
int vpx_chroma_subsampling =
get_vpx_chroma_subsampling(s, par->format, par->chroma_location);
int vpx_video_full_range_flag =
get_vpx_video_full_range_flag(par->color_range);
if (bit_depth < 0 || vpx_chroma_subsampling < 0)
return AVERROR_INVALIDDATA;
if (profile == FF_PROFILE_UNKNOWN) {
if (vpx_chroma_subsampling == VPX_SUBSAMPLING_420_VERTICAL ||
vpx_chroma_subsampling == VPX_SUBSAMPLING_420_COLLOCATED_WITH_LUMA) {
profile = (bit_depth == 8) ? FF_PROFILE_VP9_0 : FF_PROFILE_VP9_2;
} else {
profile = (bit_depth == 8) ? FF_PROFILE_VP9_1 : FF_PROFILE_VP9_3;
}
}
avio_w8(pb, profile);
avio_w8(pb, level);
avio_w8(pb, (bit_depth << 4) | (vpx_chroma_subsampling << 1) | vpx_video_full_range_flag);
avio_w8(pb, par->color_primaries);
avio_w8(pb, par->color_trc);
avio_w8(pb, par->color_space);
// vp9 does not have codec initialization data.
avio_wb16(pb, 0);
return 0;
}
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