mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2026-06-12 19:24:22 +08:00
91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
|
/*
|
|||
|
|
* Copyright (c) 2016-present The ZLMediaKit project authors. All Rights Reserved.
|
|||
|
|
*
|
|||
|
|
* This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
|
|||
|
|
*
|
|||
|
|
* Use of this source code is governed by MIT-like license that can be found in the
|
|||
|
|
* LICENSE file in the root of the source tree. All contributing project authors
|
|||
|
|
* may be found in the AUTHORS file in the root of the source tree.
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
#ifndef ZLMEDIAKIT_MP2A_H
|
|||
|
|
#define ZLMEDIAKIT_MP2A_H
|
|||
|
|
|
|||
|
|
#include "Extension/Frame.h"
|
|||
|
|
#include "Extension/Track.h"
|
|||
|
|
|
|||
|
|
namespace mediakit {
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* MPEG-1/2 Audio (Layer I/II) 帧辅助类模板
|
|||
|
|
* MPEG-1/2 Audio (Layer I/II) frame helper class template
|
|||
|
|
*/
|
|||
|
|
template <typename Parent>
|
|||
|
|
class MP2AFrameHelper : public Parent {
|
|||
|
|
public:
|
|||
|
|
using Ptr = std::shared_ptr<MP2AFrameHelper>;
|
|||
|
|
|
|||
|
|
template <typename... ARGS>
|
|||
|
|
MP2AFrameHelper(ARGS &&...args)
|
|||
|
|
: Parent(std::forward<ARGS>(args)...) {
|
|||
|
|
this->_codec_id = CodecMP2A;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
bool keyFrame() const override { return false; }
|
|||
|
|
bool configFrame() const override { return false; }
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
/// MPEG-1/2 Audio 帧类
|
|||
|
|
using MP2AFrame = MP2AFrameHelper<FrameImp>;
|
|||
|
|
using MP2AFrameNoCacheAble = MP2AFrameHelper<FrameFromPtr>;
|
|||
|
|
|
|||
|
|
// MPEG Audio 帧头解析工具
|
|||
|
|
// MPEG Audio frame header parsing utility
|
|||
|
|
struct MpegAudioFrameInfo {
|
|||
|
|
int version = 0; // 1: MPEG-1, 2: MPEG-2, 3: MPEG-2.5
|
|||
|
|
int layer = 0; // 1: Layer I, 2: Layer II, 3: Layer III
|
|||
|
|
int bitrate = 0; // kbps
|
|||
|
|
int sample_rate = 0; // Hz
|
|||
|
|
int channels = 0; // 1: mono, 2: stereo
|
|||
|
|
int frame_size = 0; // bytes per frame
|
|||
|
|
int samples_per_frame = 0;
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 从 MPEG Audio sync word 解析帧头信息
|
|||
|
|
* Parse frame header info from MPEG Audio sync word
|
|||
|
|
* @param data 数据指针，至少4字节
|
|||
|
|
* @param size 数据大小
|
|||
|
|
* @return 是否解析成功
|
|||
|
|
*/
|
|||
|
|
static bool parse(const uint8_t *data, size_t size, MpegAudioFrameInfo &info);
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* MPEG-1/2 Audio (Layer I/II) Track
|
|||
|
|
* 对应 CodecMP2A
|
|||
|
|
*/
|
|||
|
|
class MP2ATrack : public AudioTrackImp {
|
|||
|
|
public:
|
|||
|
|
using Ptr = std::shared_ptr<MP2ATrack>;
|
|||
|
|
|
|||
|
|
MP2ATrack(int sample_rate = 44100, int channels = 2)
|
|||
|
|
: AudioTrackImp(CodecMP2A, sample_rate, channels, 16) {}
|
|||
|
|
|
|||
|
|
bool inputFrame(const Frame::Ptr &frame) override;
|
|||
|
|
|
|||
|
|
private:
|
|||
|
|
/**
|
|||
|
|
* RFC 2250/3551 规定 MPA 的 RTP 时钟频率固定为 90000
|
|||
|
|
* RFC 2250/3551 specifies MPA RTP clock rate is fixed at 90000
|
|||
|
|
*/
|
|||
|
|
Sdp::Ptr getSdp(uint8_t payload_type) const override;
|
|||
|
|
Track::Ptr clone() const override;
|
|||
|
|
|
|||
|
|
private:
|
|||
|
|
bool _info_parsed = false;
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
} // namespace mediakit
|
|||
|
|
|
|||
|
|
#endif // ZLMEDIAKIT_MP2A_H
|