ZLMediaKit/ext-codec/G711.cpp

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/*
* 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.
*/
#include "G711.h"
#include "G711Rtp.h"
#include "Extension/Factory.h"
#include "Extension/CommonRtp.h"
#include "Extension/CommonRtmp.h"
using namespace std;
using namespace toolkit;
namespace mediakit {
/**
* G711类型SDP
* G711 type SDP
* [AUTO-TRANSLATED:ea72d60a]
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*/
class G711Sdp : public Sdp {
public:
/**
* G711采样率固定为8000
* @param codecId G711A G711U
* @param payload_type rtp payload type
* @param sample_rate
* @param channels
* @param bitrate
* G711 sampling rate is fixed at 8000
* @param codecId G711A G711U
* @param payload_type rtp payload type
* @param sample_rate audio sampling rate
* @param channels number of channels
* @param bitrate bitrate
* [AUTO-TRANSLATED:5ea4b771]
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*/
G711Sdp(CodecId codecId, int payload_type, int sample_rate, int channels, int bitrate)
: Sdp(sample_rate, payload_type) {
_printer << "m=audio 0 RTP/AVP " << payload_type << "\r\n";
if (bitrate) {
_printer << "b=AS:" << bitrate << "\r\n";
}
_printer << "a=rtpmap:" << payload_type << " " << getCodecName(codecId) << "/" << sample_rate << "/" << channels << "\r\n";
}
string getSdp() const override {
return _printer;
}
private:
_StrPrinter _printer;
};
Track::Ptr G711Track::clone() const {
return std::make_shared<G711Track>(*this);
}
Sdp::Ptr G711Track::getSdp(uint8_t payload_type) const {
if (!ready()) {
WarnL << getCodecName() << " Track未准备好";
return nullptr;
}
const auto codec = getCodecId();
const auto sample_rate = getAudioSampleRate();
const auto audio_channel = getAudioChannel();
const auto bitrate = getBitRate() >> 10;
if (sample_rate == 8000 && audio_channel == 1) {
// https://datatracker.ietf.org/doc/html/rfc3551#section-6
payload_type = (codec == CodecG711U) ? Rtsp::PT_PCMU : Rtsp::PT_PCMA;
}
return std::make_shared<G711Sdp>(codec, payload_type, sample_rate, audio_channel, bitrate);
}
namespace {
CodecId getCodecA() {
return CodecG711A;
}
CodecId getCodecU() {
return CodecG711U;
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}
Track::Ptr getTrackByCodecId_l(CodecId codec, int sample_rate, int channels, int sample_bit) {
return (sample_rate && channels && sample_bit) ? std::make_shared<G711Track>(codec, sample_rate, channels, sample_bit) : nullptr;
}
Track::Ptr getTrackByCodecIdA(int sample_rate, int channels, int sample_bit) {
return getTrackByCodecId_l(CodecG711A, sample_rate, channels, sample_bit);
}
Track::Ptr getTrackByCodecIdU(int sample_rate, int channels, int sample_bit) {
return getTrackByCodecId_l(CodecG711U, sample_rate, channels, sample_bit);
}
Track::Ptr getTrackBySdp_l(CodecId codec, const SdpTrack::Ptr &track) {
return std::make_shared<G711Track>(codec, track->_samplerate, track->_channel, 16);
}
Track::Ptr getTrackBySdpA(const SdpTrack::Ptr &track) {
return getTrackBySdp_l(CodecG711A, track);
}
Track::Ptr getTrackBySdpU(const SdpTrack::Ptr &track) {
return getTrackBySdp_l(CodecG711U, track);
}
RtpCodec::Ptr getRtpEncoderByCodecId_l(CodecId codec, uint8_t pt) {
if (pt == Rtsp::PT_PCMA || pt == Rtsp::PT_PCMU) {
return std::make_shared<G711RtpEncoder>(codec, 1);
}
return std::make_shared<CommonRtpEncoder>();
}
RtpCodec::Ptr getRtpEncoderByCodecIdA(uint8_t pt) {
return getRtpEncoderByCodecId_l(CodecG711A, pt);
}
RtpCodec::Ptr getRtpEncoderByCodecIdU(uint8_t pt) {
return getRtpEncoderByCodecId_l(CodecG711U, pt);
}
RtpCodec::Ptr getRtpDecoderByCodecId_l(CodecId codec) {
return std::make_shared<CommonRtpDecoder>(codec);
}
RtpCodec::Ptr getRtpDecoderByCodecIdA() {
return getRtpDecoderByCodecId_l(CodecG711A);
}
RtpCodec::Ptr getRtpDecoderByCodecIdU() {
return getRtpDecoderByCodecId_l(CodecG711U);
}
RtmpCodec::Ptr getRtmpEncoderByTrack(const Track::Ptr &track) {
auto audio_track = dynamic_pointer_cast<AudioTrack>(track);
if (audio_track->getAudioSampleRate() != 8000 || audio_track->getAudioChannel() != 1 || audio_track->getAudioSampleBit() != 16) {
// rtmp对g711只支持8000/1/16规格但是ZLMediaKit可以解析其他规格的G711 [AUTO-TRANSLATED:0ddeaafe]
// rtmp only supports 8000/1/16 specifications for g711, but ZLMediaKit can parse other specifications of G711
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WarnL << "RTMP only support G711 with 8000/1/16, now is"
<< audio_track->getAudioSampleRate() << "/"
<< audio_track->getAudioChannel() << "/"
<< audio_track->getAudioSampleBit()
<< ", ignored it";
return nullptr;
}
return std::make_shared<CommonRtmpEncoder>(track);
}
RtmpCodec::Ptr getRtmpDecoderByTrack(const Track::Ptr &track) {
return std::make_shared<CommonRtmpDecoder>(track);
}
Frame::Ptr getFrameFromPtr_l(CodecId codec, const char *data, size_t bytes, uint64_t dts, uint64_t pts) {
return std::make_shared<FrameFromPtr>(codec, (char *)data, bytes, dts, pts);
}
Frame::Ptr getFrameFromPtrA(const char *data, size_t bytes, uint64_t dts, uint64_t pts) {
return getFrameFromPtr_l(CodecG711A, (char *)data, bytes, dts, pts);
}
Frame::Ptr getFrameFromPtrU(const char *data, size_t bytes, uint64_t dts, uint64_t pts) {
return getFrameFromPtr_l(CodecG711U, (char *)data, bytes, dts, pts);
}
} // namespace
CodecPlugin g711a_plugin = { getCodecA,
getTrackByCodecIdA,
getTrackBySdpA,
getRtpEncoderByCodecIdA,
getRtpDecoderByCodecIdA,
getRtmpEncoderByTrack,
getRtmpDecoderByTrack,
getFrameFromPtrA };
CodecPlugin g711u_plugin = { getCodecU,
getTrackByCodecIdU,
getTrackBySdpU,
getRtpEncoderByCodecIdU,
getRtpDecoderByCodecIdU,
getRtmpEncoderByTrack,
getRtmpDecoderByTrack,
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getFrameFromPtrU };
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}//namespace mediakit