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// Copyright 2018 Google LLC
//
// 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
//
// https://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.
// https://github.com/google/opuscpp
#include <iterator>
#include <memory>
#include <string>
#include <vector>
#include <android-base/logging.h>
#include "host/frontend/stream_audio/opuscpp/opus_wrapper.h"
std::string opus::ErrorToString(int error) {
switch (error) {
case OPUS_OK:
return "OK";
case OPUS_BAD_ARG:
return "One or more invalid/out of range arguments.";
case OPUS_BUFFER_TOO_SMALL:
return "The mode struct passed is invalid.";
case OPUS_INTERNAL_ERROR:
return "An internal error was detected.";
case OPUS_INVALID_PACKET:
return "The compressed data passed is corrupted.";
case OPUS_UNIMPLEMENTED:
return "Invalid/unsupported request number.";
case OPUS_INVALID_STATE:
return "An encoder or decoder structure is invalid or already freed.";
default:
return "Unknown error code: " + std::to_string(error);
}
}
void opus::internal::OpusDestroyer::operator()(OpusEncoder* encoder) const
noexcept {
opus_encoder_destroy(encoder);
}
void opus::internal::OpusDestroyer::operator()(OpusDecoder* decoder) const
noexcept {
opus_decoder_destroy(decoder);
}
opus::Encoder::Encoder(opus_int32 sample_rate, int num_channels,
int application, int expected_loss_percent)
: num_channels_{num_channels} {
int error{};
encoder_.reset(
opus_encoder_create(sample_rate, num_channels, application, &error));
valid_ = error == OPUS_OK;
if (!valid()) {
LOG(INFO) << "Could not construct encoder. Error: " << ErrorToString(error);
return;
}
if (expected_loss_percent > 0) {
LOG(INFO) << "Enabling FEC in the encoder.";
Ctl(OPUS_SET_INBAND_FEC(1));
Ctl(OPUS_SET_PACKET_LOSS_PERC(expected_loss_percent));
}
}
bool opus::Encoder::ResetState() {
valid_ = Ctl(OPUS_RESET_STATE) == OPUS_OK;
return valid_;
}
bool opus::Encoder::SetBitrate(int bitrate) {
valid_ = Ctl(OPUS_SET_BITRATE(bitrate)) == OPUS_OK;
return valid_;
}
bool opus::Encoder::SetVariableBitrate(int vbr) {
valid_ = Ctl(OPUS_SET_VBR(vbr)) == OPUS_OK;
return valid_;
}
bool opus::Encoder::SetComplexity(int complexity) {
valid_ = Ctl(OPUS_SET_COMPLEXITY(complexity)) == OPUS_OK;
return valid_;
}
int opus::Encoder::GetLookahead() {
opus_int32 skip{};
valid_ = Ctl(OPUS_GET_LOOKAHEAD(&skip)) == OPUS_OK;
return skip;
}
std::vector<std::vector<unsigned char>> opus::Encoder::Encode(
const std::vector<opus_int16>& pcm, int frame_size) {
constexpr auto sample_size = sizeof(pcm[0]);
const auto frame_length = frame_size * num_channels_ * sample_size;
auto data_length = pcm.size() * sample_size;
if (data_length % frame_length != 0u) {
LOG(WARNING) << "PCM samples contain an incomplete frame. Ignoring the "
"incomplete frame.";
data_length -= (data_length % frame_length);
}
std::vector<std::vector<unsigned char>> encoded;
for (std::size_t i{}; i < data_length; i += frame_length) {
encoded.push_back(EncodeFrame(pcm.begin() + (i / sample_size), frame_size));
}
return encoded;
}
std::vector<unsigned char> opus::Encoder::EncodeFrame(
const std::vector<opus_int16>::const_iterator& frame_start,
int frame_size) {
const auto frame_length = (frame_size * num_channels_ * sizeof(*frame_start));
std::vector<unsigned char> encoded(frame_length);
auto num_bytes = opus_encode(encoder_.get(), &*frame_start, frame_size,
encoded.data(), encoded.size());
if (num_bytes < 0) {
LOG(ERROR) << "Encode error: " << opus::ErrorToString(num_bytes);
return {};
}
encoded.resize(num_bytes);
return encoded;
}
opus::Decoder::Decoder(opus_uint32 sample_rate, int num_channels)
: num_channels_(num_channels) {
int error{};
decoder_.reset(opus_decoder_create(sample_rate, num_channels, &error));
valid_ = error == OPUS_OK;
}
std::vector<opus_int16> opus::Decoder::Decode(
const std::vector<std::vector<unsigned char>>& packets, int frame_size,
bool decode_fec) {
std::vector<opus_int16> decoded;
for (const auto& enc : packets) {
auto just_decoded = Decode(enc, frame_size, decode_fec);
decoded.insert(std::end(decoded), std::begin(just_decoded),
std::end(just_decoded));
}
return decoded;
}
std::vector<opus_int16> opus::Decoder::Decode(
const std::vector<unsigned char>& packet, int frame_size, bool decode_fec) {
const auto frame_length = (frame_size * num_channels_ * sizeof(opus_int16));
std::vector<opus_int16> decoded(frame_length);
auto num_samples = opus_decode(decoder_.get(), packet.data(), packet.size(),
decoded.data(), frame_size, decode_fec);
if (num_samples < 0) {
LOG(ERROR) << "Decode error: " << opus::ErrorToString(num_samples);
return {};
}
decoded.resize(num_samples * num_channels_);
return decoded;
}
std::vector<opus_int16> opus::Decoder::DecodeDummy(int frame_size) {
const auto frame_length = (frame_size * num_channels_ * sizeof(opus_int16));
std::vector<opus_int16> decoded(frame_length);
auto num_samples =
opus_decode(decoder_.get(), nullptr, 0, decoded.data(), frame_size, true);
if (num_samples < 0) {
LOG(ERROR) << "Decode error: " << opus::ErrorToString(num_samples);
return {};
}
decoded.resize(num_samples * num_channels_);
return decoded;
}
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