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/*
Copyright (C) 2022 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "constants.h"
#include "dcpomatic_assert.h"
#include "util.h"
#include "vp9_pcm_block.h"
using std::vector;
auto constexpr pcm_block_size = SIGN_LANGUAGE_AUDIO_FRAME_RATE * AUDIO_BYTES_PER_SAMPLE * SIGN_LANGUAGE_CHUNK_LENGTH_IN_SECONDS;
VP9PCMBlock::VP9PCMBlock(uint8_t const* vp9_segment, int vp9_segment_size, vector<uint8_t> const& ebml_header)
: _data(pcm_block_size)
{
uint32_t const ebml_header_size = ebml_header.size();
DCPOMATIC_ASSERT(vp9_segment_size < static_cast<int>((pcm_block_size - 20 - ebml_header_size)));
// H_1
_data[0] = 0xff;
_data[1] = 0xff;
_data[2] = 0xff;
_data[3] = 0xff;
// Length of VP9 segment, big-endian, unsigned
_data[4] = (vp9_segment_size >> 24) & 0xff;
_data[5] = (vp9_segment_size >> 16) & 0xff;
_data[6] = (vp9_segment_size >> 8) & 0xff;
_data[7] = (vp9_segment_size >> 0) & 0xff;
// Length of PCM block, big-endian, unsigned
_data[8] = (pcm_block_size >> 24) & 0xff;
_data[9] = (pcm_block_size >> 16) & 0xff;
_data[10] = (pcm_block_size >> 8) & 0xff;
_data[11] = (pcm_block_size >> 0) & 0xff;
// Length of VP9 EBML header, big-endian, unsigned
_data[12] = (ebml_header_size >> 24) & 0xff;
_data[13] = (ebml_header_size >> 16) & 0xff;
_data[14] = (ebml_header_size >> 8) & 0xff;
_data[15] = (ebml_header_size >> 0) & 0xff;
// H_2
_data[16] = 0xff;
_data[17] = 0xff;
_data[18] = 0xff;
_data[19] = 0xff;
// VP9 EBML header
std::copy(ebml_header.begin(), ebml_header.end(), _data.begin() + 20);
// VP9 payload
memcpy(_data.data() + 20 + ebml_header.size(), vp9_segment, vp9_segment_size);
}
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