| /* |
| * Copyright (C) 2018 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /* |
| * The Opus specification is part of IETF RFC 6716: |
| * http://tools.ietf.org/html/rfc6716 |
| */ |
| |
| #ifndef OPUS_HEADER_H_ |
| #define OPUS_HEADER_H_ |
| |
| namespace android { |
| |
| /* Constants used for delimiting Opus CSD */ |
| #define AOPUS_CSD_MARKER_PREFIX "AOPUS" |
| #define AOPUS_CSD_MARKER_PREFIX_SIZE (sizeof(AOPUS_CSD_MARKER_PREFIX) - 1) |
| #define AOPUS_CSD_OPUS_HEADER_MARKER AOPUS_CSD_MARKER_PREFIX "HDR" |
| #define AOPUS_CSD_CODEC_DELAY_MARKER AOPUS_CSD_MARKER_PREFIX "DLY" |
| #define AOPUS_CSD_SEEK_PREROLL_MARKER AOPUS_CSD_MARKER_PREFIX "PRL" |
| #define AOPUS_MARKER_SIZE 8 |
| #define AOPUS_LENGTH_SIZE sizeof(uint64_t) |
| #define AOPUS_CSD_CODEC_DELAY_SIZE \ |
| (AOPUS_MARKER_SIZE) + (AOPUS_LENGTH_SIZE) + sizeof(uint64_t) |
| #define AOPUS_CSD_SEEK_PREROLL_SIZE \ |
| (AOPUS_MARKER_SIZE) + (AOPUS_LENGTH_SIZE) + sizeof(uint64_t) |
| |
| /* OpusHead csd minimum size is 19 */ |
| #define AOPUS_OPUSHEAD_MINSIZE 19 |
| #define AOPUS_CSD_OPUSHEAD_MINSIZE \ |
| (AOPUS_MARKER_SIZE) + (AOPUS_LENGTH_SIZE) + (AOPUS_OPUSHEAD_MINSIZE) |
| |
| #define AOPUS_UNIFIED_CSD_MINSIZE \ |
| ((AOPUS_CSD_OPUSHEAD_MINSIZE) + \ |
| (AOPUS_CSD_CODEC_DELAY_SIZE) + \ |
| (AOPUS_CSD_SEEK_PREROLL_SIZE)) |
| |
| /* OpusHead csd at max can be AOPUS_CSD_OPUSHEAD_MINSIZE + 2 + max number of channels (255) */ |
| #define AOPUS_OPUSHEAD_MAXSIZE ((AOPUS_OPUSHEAD_MINSIZE) + 2 + 255) |
| #define AOPUS_CSD_OPUSHEAD_MAXSIZE \ |
| (AOPUS_MARKER_SIZE) + (AOPUS_LENGTH_SIZE) + (AOPUS_OPUSHEAD_MAXSIZE) |
| |
| #define AOPUS_UNIFIED_CSD_MAXSIZE \ |
| ((AOPUS_CSD_OPUSHEAD_MAXSIZE) + \ |
| (AOPUS_CSD_CODEC_DELAY_SIZE) + \ |
| (AOPUS_CSD_SEEK_PREROLL_SIZE)) |
| |
| struct OpusHeader { |
| int channels; |
| int channel_mapping; |
| int num_streams; |
| int num_coupled; |
| int16_t gain_db; |
| int skip_samples; |
| uint8_t stream_map[8]; |
| }; |
| |
| bool ParseOpusHeader(const uint8_t* data, size_t data_size, OpusHeader* header); |
| int WriteOpusHeader(const OpusHeader &header, int input_sample_rate, uint8_t* output, size_t output_size); |
| bool GetOpusHeaderBuffers(const uint8_t *data, size_t data_size, |
| void **opusHeadBuf, size_t *opusHeadSize, |
| void **codecDelayBuf, size_t *codecDelaySize, |
| void **seekPreRollBuf, size_t *seekPreRollSize); |
| int WriteOpusHeaders(const OpusHeader &header, int inputSampleRate, |
| uint8_t* output, size_t outputSize, uint64_t codecDelay, |
| uint64_t seekPreRoll); |
| bool IsOpusHeader(const uint8_t *data, size_t data_size); |
| } // namespace android |
| |
| #endif // OPUS_HEADER_H_ |