tdesktop/Telegram/SourceFiles/media/media_child_ffmpeg_loader.h

137 lines
3.5 KiB
C++

/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org
Telegram Desktop is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
It is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.
Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2016 John Preston, https://desktop.telegram.org
*/
#pragma once
#include "media/media_audio_loader.h"
extern "C" {
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavutil/opt.h>
#include <libswresample/swresample.h>
} // extern "C"
#include <AL/al.h>
struct VideoSoundData {
AVCodecContext *context = nullptr;
int32 frequency = AudioVoiceMsgFrequency;
int64 length = 0;
~VideoSoundData();
};
struct VideoSoundPart {
AVPacket *packet = nullptr;
uint64 videoPlayId = 0;
};
namespace FFMpeg {
// AVPacket has a deprecated field, so when you copy an AVPacket
// variable (e.g. inside QQueue), a compile warning is emited.
// We wrap full AVPacket data in a new AVPacketDataWrap struct.
// All other fields are copied from AVPacket without modifications.
struct AVPacketDataWrap {
char __data[sizeof(AVPacket)];
};
inline void packetFromDataWrap(AVPacket &packet, const AVPacketDataWrap &data) {
memcpy(&packet, &data, sizeof(data));
}
inline AVPacketDataWrap dataWrapFromPacket(const AVPacket &packet) {
AVPacketDataWrap data;
memcpy(&data, &packet, sizeof(data));
return data;
}
inline bool isNullPacket(const AVPacket &packet) {
return packet.data == nullptr && packet.size == 0;
}
inline bool isNullPacket(const AVPacket *packet) {
return isNullPacket(*packet);
}
inline void freePacket(AVPacket *packet) {
if (!isNullPacket(packet)) {
av_packet_unref(packet);
}
}
} // namespace FFMpeg
class ChildFFMpegLoader : public AudioPlayerLoader {
public:
ChildFFMpegLoader(uint64 videoPlayId, std_::unique_ptr<VideoSoundData> &&data);
bool open(qint64 &position) override;
bool check(const FileLocation &file, const QByteArray &data) override {
return true;
}
int32 format() override {
return _format;
}
int64 duration() override {
return _parentData->length;
}
int32 frequency() override {
return _parentData->frequency;
}
ReadResult readMore(QByteArray &result, int64 &samplesAdded) override;
void enqueuePackets(QQueue<FFMpeg::AVPacketDataWrap> &packets);
uint64 playId() const {
return _videoPlayId;
}
bool eofReached() const {
return _eofReached;
}
~ChildFFMpegLoader();
private:
ReadResult readFromReadyFrame(QByteArray &result, int64 &samplesAdded);
bool _eofReached = false;
int32 _sampleSize = 2 * sizeof(uint16);
int32 _format = AL_FORMAT_STEREO16;
int32 _srcRate = AudioVoiceMsgFrequency;
int32 _dstRate = AudioVoiceMsgFrequency;
int32 _maxResampleSamples = 1024;
uint8_t **_dstSamplesData = nullptr;
uint64 _videoPlayId = 0;
std_::unique_ptr<VideoSoundData> _parentData;
AVSampleFormat _inputFormat;
AVFrame *_frame = nullptr;
SwrContext *_swrContext = nullptr;
QQueue<FFMpeg::AVPacketDataWrap> _queue;
};