64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
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/*
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* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/api/audio_codecs/ilbc/audio_encoder_ilbc.h"
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#include <memory>
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#include <vector>
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#include "webrtc/base/ptr_util.h"
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#include "webrtc/base/safe_conversions.h"
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#include "webrtc/modules/audio_coding/codecs/ilbc/audio_encoder_ilbc.h"
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namespace webrtc {
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namespace {
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int GetIlbcBitrate(int ptime) {
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switch (ptime) {
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case 20:
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case 40:
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// 38 bytes per frame of 20 ms => 15200 bits/s.
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return 15200;
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case 30:
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case 60:
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// 50 bytes per frame of 30 ms => (approx) 13333 bits/s.
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return 13333;
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default:
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FATAL();
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}
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}
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} // namespace
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rtc::Optional<AudioEncoderIlbcConfig> AudioEncoderIlbc::SdpToConfig(
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const SdpAudioFormat& format) {
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return AudioEncoderIlbcImpl::SdpToConfig(format);
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}
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void AudioEncoderIlbc::AppendSupportedEncoders(
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std::vector<AudioCodecSpec>* specs) {
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const SdpAudioFormat fmt = {"ILBC", 8000, 1};
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const AudioCodecInfo info = QueryAudioEncoder(*SdpToConfig(fmt));
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specs->push_back({fmt, info});
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}
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AudioCodecInfo AudioEncoderIlbc::QueryAudioEncoder(
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const AudioEncoderIlbcConfig& config) {
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RTC_DCHECK(config.IsOk());
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return {8000, 1, GetIlbcBitrate(config.frame_size_ms)};
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}
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std::unique_ptr<AudioEncoder> AudioEncoderIlbc::MakeAudioEncoder(
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const AudioEncoderIlbcConfig& config,
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int payload_type) {
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RTC_DCHECK(config.IsOk());
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return rtc::MakeUnique<AudioEncoderIlbcImpl>(config, payload_type);
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}
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} // namespace webrtc
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