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Diffstat (limited to 'src/lib/vp9_pcm_block.cc')
| -rw-r--r-- | src/lib/vp9_pcm_block.cc | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/src/lib/vp9_pcm_block.cc b/src/lib/vp9_pcm_block.cc new file mode 100644 index 000000000..a606b4f93 --- /dev/null +++ b/src/lib/vp9_pcm_block.cc @@ -0,0 +1,71 @@ +/* + 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); +} + |