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/*
* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_G711_AUDIO_ENCODER_PCM_H_
#define WEBRTC_MODULES_AUDIO_CODING_CODECS_G711_AUDIO_ENCODER_PCM_H_
#include <vector>
#include "webrtc/api/audio_codecs/audio_encoder.h"
#include "webrtc/api/audio_codecs/audio_format.h"
#include "webrtc/rtc_base/constructormagic.h"
namespace webrtc {
class AudioEncoderPcm : public AudioEncoder {
public:
struct Config {
public:
bool IsOk() const;
int frame_size_ms;
size_t num_channels;
int payload_type;
protected:
explicit Config(int pt)
: frame_size_ms(20), num_channels(1), payload_type(pt) {}
};
~AudioEncoderPcm() override;
int SampleRateHz() const override;
size_t NumChannels() const override;
size_t Num10MsFramesInNextPacket() const override;
size_t Max10MsFramesInAPacket() const override;
int GetTargetBitrate() const override;
void Reset() override;
protected:
AudioEncoderPcm(const Config& config, int sample_rate_hz);
EncodedInfo EncodeImpl(uint32_t rtp_timestamp,
rtc::ArrayView<const int16_t> audio,
rtc::Buffer* encoded) override;
virtual size_t EncodeCall(const int16_t* audio,
size_t input_len,
uint8_t* encoded) = 0;
virtual size_t BytesPerSample() const = 0;
// Used to set EncodedInfoLeaf::encoder_type in
// AudioEncoderPcm::EncodeImpl
virtual AudioEncoder::CodecType GetCodecType() const = 0;
private:
const int sample_rate_hz_;
const size_t num_channels_;
const int payload_type_;
const size_t num_10ms_frames_per_packet_;
const size_t full_frame_samples_;
std::vector<int16_t> speech_buffer_;
uint32_t first_timestamp_in_buffer_;
};
struct CodecInst;
class AudioEncoderPcmA final : public AudioEncoderPcm {
public:
struct Config : public AudioEncoderPcm::Config {
Config() : AudioEncoderPcm::Config(8) {}
};
explicit AudioEncoderPcmA(const Config& config)
: AudioEncoderPcm(config, kSampleRateHz) {}
explicit AudioEncoderPcmA(const CodecInst& codec_inst);
AudioEncoderPcmA(int payload_type, const SdpAudioFormat& format);
static constexpr const char* GetPayloadName() { return "PCMA"; }
static rtc::Optional<AudioCodecInfo> QueryAudioEncoder(
const SdpAudioFormat& format);
protected:
size_t EncodeCall(const int16_t* audio,
size_t input_len,
uint8_t* encoded) override;
size_t BytesPerSample() const override;
AudioEncoder::CodecType GetCodecType() const override;
private:
static const int kSampleRateHz = 8000;
RTC_DISALLOW_COPY_AND_ASSIGN(AudioEncoderPcmA);
};
class AudioEncoderPcmU final : public AudioEncoderPcm {
public:
struct Config : public AudioEncoderPcm::Config {
Config() : AudioEncoderPcm::Config(0) {}
};
explicit AudioEncoderPcmU(const Config& config)
: AudioEncoderPcm(config, kSampleRateHz) {}
explicit AudioEncoderPcmU(const CodecInst& codec_inst);
AudioEncoderPcmU(int payload_type, const SdpAudioFormat& format);
static constexpr const char* GetPayloadName() { return "PCMU"; }
static rtc::Optional<AudioCodecInfo> QueryAudioEncoder(
const SdpAudioFormat& format);
protected:
size_t EncodeCall(const int16_t* audio,
size_t input_len,
uint8_t* encoded) override;
size_t BytesPerSample() const override;
AudioEncoder::CodecType GetCodecType() const override;
private:
static const int kSampleRateHz = 8000;
RTC_DISALLOW_COPY_AND_ASSIGN(AudioEncoderPcmU);
};
} // namespace webrtc
#endif // WEBRTC_MODULES_AUDIO_CODING_CODECS_G711_AUDIO_ENCODER_PCM_H_