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Recorder.cpp
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Recorder.cpp
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#include "Recorder.h"
/** Initialize resources **/
Recorder::Recorder() {
avdevice_register_all();
#ifdef WIN32
SetProcessDPIAware();
width = GetSystemMetrics(SM_CXSCREEN);
height = GetSystemMetrics(SM_CYSCREEN);
#elif linux
Display* disp = XOpenDisplay(NULL);
Screen* scrn = DefaultScreenOfDisplay(disp);
width = scrn->width;
height = scrn->height;
#endif
}
/** Destroy resources **/
Recorder::~Recorder() {
if (!exited) {
av_write_trailer(oFormatCtx);
if (!(oformat->flags & AVFMT_NOFILE)) {
int err = avio_close(oFormatCtx->pb);
if (err < 0) {
std::cout << "Failed to close file" << err << std::endl;
}
}
avformat_close_input(&iFormatCtx);
av_dict_free(&options);
avcodec_close(DecoderCodecCtx);
avcodec_close(EncoderCodecCtx);
if (audio) {
avformat_close_input(&AudioInFCtx);
av_dict_free(&AudioOptions);
avcodec_close(AudioDecoderCodecCtx);
avcodec_close(AudioEncoderCodecCtx);
}
avformat_free_context(oFormatCtx);
avformat_free_context(iFormatCtx);
outFile.close();
}
}
void Recorder::menu() {
string output_file;
char audio;
int x1 = 0, x2 = 0, y1 = 0, y2 = 0;
string audio_dev;
cout << "Specify an audio device: ";
getline(cin, audio_dev);
endl(cout);
#if defined WIN32
this->audio_device = "audio=" + audio_dev;
#elif defined linux
this->audio_device = audio_dev;
#endif
cout << "Specify an output file: ";
cin >> output_file;
endl(cout);
this->output_file = (char *) calloc(output_file.length(), sizeof(char));
output_file.copy(this->output_file, output_file.length());
do {
cout << "Do you want audio recording? (Y,N):";
cin >> audio;
endl(cout);
} while (audio != 'Y' && audio != 'y' && audio != 'N' && audio != 'n');
this->audio = audio == 'Y' || audio == 'y';
cout << "Insert offset X1:";
cin >> x1;
while (!cin || x1 < 0 || x1 % 2 != 0) {
if (!cin) // or if(cin.fail())
{
// user didn't input a number
cout << "Please insert a valid offset" << endl;
cin.clear(); // reset failbit
cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); //skip bad input
// next, request user reinput
} else
cout << "Offset X1 out of range!" << endl;
cout << "Insert offset X1:";
cin >> x1;
}
cout << "Insert offset Y1:";
cin >> y1;
while (!cin || y1 < 0 || y1 % 2 != 0) {
if (!cin) // or if(cin.fail())
{
// user didn't input a number
cout << "Please insert a valid offset" << endl;
cin.clear(); // reset failbit
cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); //skip bad input
// next, request user reinput
} else
cout << "Offset Y1 out of range!" << endl;
cout << "Insert offset Y1:";
cin >> y1;
}
cout << "Insert offset X2:";
cin >> x2;
while (!cin || x2 < 0 || x2 % 2 != 0) {
if (!cin) // or if(cin.fail())
{
// user didn't input a number
cout << "Please insert a valid offset" << endl;
cin.clear(); // reset failbit
cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); //skip bad input
// next, request user reinput
} else
cout << "Offset X2 out of range!" << endl;
cout << "Insert offset X2:";
cin >> x2;
}
cout << "Insert offset Y2:";
cin >> y2;
while (!cin || y2 < 0 || y2 % 2 != 0) {
if (!cin) // or if(cin.fail())
{
// user didn't input a number
cout << "Please insert a valid offset" << endl;
cin.clear(); // reset failbit
cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); //skip bad input
// next, request user reinput
} else
cout << "Offset Y2 out of range!" << endl;
cout << "Insert offset Y2:";
cin >> y2;
}
while (width - x1 - x2 <= 0 || height - y1 - y2 <= 0) {
cout << "Offsets NOT valid! Please insert again" << endl;
cout << "Insert offset X1:";
cin >> x1;
while (!cin || x1 < 0 || x1 % 2 != 0) {
if (!cin) // or if(cin.fail())
{
// user didn't input a number
cout << "Please insert a valid offset" << endl;
cin.clear(); // reset failbit
cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); //skip bad input
// next, request user reinput
} else
cout << "Offset X1 out of range!" << endl;
cout << "Insert offset X1:";
cin >> x1;
}
cout << "Insert offset Y1:";
cin >> y1;
cout.flush();
while (!cin || y1 < 0 || y1 % 2 != 0) {
if (!cin) // or if(cin.fail())
{
// user didn't input a number
cout << "Please insert a valid offset" << endl;
cin.clear(); // reset failbit
cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); //skip bad input
// next, request user reinput
} else
cout << "Offset Y1 out of range!" << endl;
cout << "Insert offset Y1:";
cin >> y1;
cout.flush();
}
cout << "Insert offset X2:";
cin >> x2;
cout.flush();
while (!cin || x2 < 0 || x2 % 2 != 0) {
if (!cin) // or if(cin.fail())
{
// user didn't input a number
cout << "Please insert a valid offset" << endl;
cin.clear(); // reset failbit
cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); //skip bad input
// next, request user reinput
} else
cout << "Offset X2 out of range!" << endl;
cout << "Insert offset X2:";
cin >> x2;
cout.flush();
}
cout << "Insert offset Y2:";
cin >> y2;
cout.flush();
while (!cin || y2 < 0 || y2 % 2 != 0) {
if (!cin) // or if(cin.fail())
{
// user didn't input a number
cout << "Please insert a valid offset" << endl;
cin.clear(); // reset failbit
cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); //skip bad input
// next, request user reinput
} else
cout << "Offset Y2 out of range!" << endl;
cout << "Insert offset Y2:";
cin >> y2;
cout.flush();
}
}
width = width - x1 - x2;
height = height - y1 - y2;
offset_x = x1;
offset_y = y1;
offset_x_v2 = x2;
offset_y_v2 = y2;
}
void Recorder::captureMenu() {
int _read;
endl(cout);
cout << "Menu options: " << endl;
do {
cin.clear(); // reset failbit
cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); //skip bad input
cout << "\t[1] Start recording" << endl;
cout << "\t[2] Exit" << endl;
cout << "\nInsert choice: ";
cin >> _read;
endl(cout);
} while (!cin || (_read != 1 && _read != 2));
{
lock_guard<mutex> lg(_lock);
if (_read == 2) {
cout << "EXITED" << endl;
exited = true;
} else
startRecording = true;
}
cv_start.notify_all();
if (exited)
return;
while (true) {
cout << "\n ......RECORDING......\n\n";
cout << "Press: " << endl;
cout << "\t[1] Stop recording";
if (pauseRecording) cout << "\t[2] Resume recording" << endl;
else cout << "\t[2] Pause recording" << endl;
cout << "Insert choice: " << endl;
cin >> _read;
if (!cin) {
cin.clear(); // reset failbit
cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n'); //skip bad input
} else {
if (_read == 1) {
lock_guard<mutex> lg(_lock);
stopRecording = true;
cout << "...STOPPED" << endl;
cv_pause.notify_all();
break;
} else if (_read == 2 && pauseRecording) {
lock_guard<mutex> lg(_lock);
pauseRecording = false;
cout << "...RESUMED" << endl;
cv_pause.notify_all();
} else if (_read == 2 && !pauseRecording) {
lock_guard<mutex> lg(_lock);
pauseRecording = true;
cout << "...PAUSED" << endl;
}
}
}
}
/** VIDEO **/
int Recorder::OpenVideoDevice() {
value = 0;
options = nullptr;
string video_size = to_string(width) + "*" + to_string(height);
#ifdef WIN32
av_dict_set(&options, "offset_x", to_string(offset_x).c_str(), 0);
av_dict_set(&options, "offset_y", to_string(offset_y).c_str(), 0);
#elif defined linux
av_dict_set(&options, "show_region", "1", 0);
#endif
av_dict_set(&options, "video_size", video_size.c_str(), 0);
av_dict_set(&options, "probesize", "30M", 0);
av_dict_set(&options, "framerate", to_string(fps).c_str(), 0);
av_dict_set(&options, "preset", "ultrafast", 0);
iFormatCtx = avformat_alloc_context();
if (iFormatCtx == nullptr) {
throw runtime_error("Could not allocate memory for Input Format Context\n");
}
#ifdef WIN32
iformat = const_cast<AVInputFormat *>(av_find_input_format("gdigrab"));
value = avformat_open_input(&iFormatCtx, "desktop", iformat, &options);
if (value < 0) {
throw runtime_error("Cannot open input device\n");
}
#elif defined linux
iformat = const_cast<AVInputFormat *>(av_find_input_format("x11grab"));
if(const char* env = std::getenv("DISPLAY")) {
regex rgx(":[0-9].[0-9]");
string display = env;
if(!regex_match(display,rgx))
display = display + ".0";
value = avformat_open_input(&iFormatCtx, (display+"+" + to_string(offset_x) + "," + to_string(offset_y)).c_str(),
iformat, &options);
if (value < 0) {
throw runtime_error("Cannot open input device\n");
}
}
else {
throw runtime_error("Cannot locate environment variable DISPLAY\n");
}
#endif
return 1;
}
int Recorder::InitializeVideoDecoder() {
value = avformat_find_stream_info(iFormatCtx, &options);
if (value < 0) {
throw runtime_error("Failed to retrieve input stream info\n");
}
VideoStreamIndx = -1;
/* find the first video stream index . Also there is an API available to do the below operations */
for (int i = 0; i < iFormatCtx->nb_streams; i++) // find video stream position/index.
if (iFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
AVCodecParameters *iLocalCodecParams = nullptr;
iLocalCodecParams = iFormatCtx->streams[i]->codecpar;
const AVCodec *iLocalCodec = nullptr;
iLocalCodec = avcodec_find_decoder(iLocalCodecParams->codec_id);
if (iLocalCodec == nullptr) {
cout << "Unsupported Codec\n";
continue;
}
if (iLocalCodecParams->codec_type == AVMEDIA_TYPE_VIDEO) {
if (VideoStreamIndx == -1) {
VideoStreamIndx = i;
DecoderCodec = iLocalCodec;
DecoderCodecParams = iLocalCodecParams;
}
}
}
if (VideoStreamIndx == -1) {
throw runtime_error("\nunable to find the video stream index. (-1)");
}
DecoderCodecCtx = avcodec_alloc_context3(DecoderCodec);
if (!DecoderCodecCtx) {
throw runtime_error("Failed to allocate memory for AVCodecContext\n");
}
value = avcodec_parameters_to_context(DecoderCodecCtx, DecoderCodecParams);
if (value < 0) {
throw runtime_error("Failed to copy decoderCodec params to decoderCodecCtx\n");
}
av_opt_set(DecoderCodecCtx, "preset", "ultrafast", 0);
value = avcodec_open2(DecoderCodecCtx, DecoderCodec, nullptr);
if (value < 0) {
throw runtime_error("Failed to open DecoderCodec!\n");
}
return 1;
}
int Recorder::InitOutputFile() {
value = 0;
oFormatCtx = nullptr;
oformat = const_cast<AVOutputFormat *>(av_guess_format(nullptr, output_file, nullptr));
if (!oformat) {
throw runtime_error("Can't create output format!\n");
}
avformat_alloc_output_context2(&oFormatCtx, oformat, nullptr, output_file);
if (!oFormatCtx) {
throw runtime_error("Can't create output context\n");
}
return 1;
}
void Recorder::lastSetUp() {
if (!(oformat->flags & AVFMT_NOFILE)) {
if ((value = avio_open(&oFormatCtx->pb, output_file, AVIO_FLAG_WRITE)) < 0) {
throw runtime_error("Failed to open output file\n");
}
}
if ((value = avformat_write_header(oFormatCtx, nullptr)) < 0) {
throw runtime_error("Failed to write header\n");
}
}
int Recorder::SetUp_VideoEncoder() {
EncoderCodec = avcodec_find_encoder(oformat->video_codec);
if (!EncoderCodec) {
throw runtime_error("Can't create EncoderCodec\n");
}
stream = avformat_new_stream(oFormatCtx, EncoderCodec);
if (!stream) {
throw runtime_error("Can't create stream for this format\n");
}
EncoderCodecCtx = avcodec_alloc_context3(EncoderCodec);
if (!EncoderCodecCtx) {
throw runtime_error("Can't create EncoderCodec Context\n");
}
stream->codecpar->codec_id = oformat->video_codec;
stream->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
stream->codecpar->width = width;
stream->codecpar->height = height;
stream->codecpar->format = AV_PIX_FMT_YUV420P;
stream->codecpar->bit_rate = 4000;
avcodec_parameters_to_context(EncoderCodecCtx, stream->codecpar);
EncoderCodecCtx->time_base.num = 1;
EncoderCodecCtx->time_base.den = fps;
EncoderCodecCtx->max_b_frames = 10;
EncoderCodecCtx->gop_size = fps * 2;
EncoderCodecCtx->qmin = 0;
EncoderCodecCtx->qmax = 5;
if (stream->codecpar->codec_id == AV_CODEC_ID_H264) {
av_opt_set(EncoderCodecCtx, "preset", "ultrafast", 0);
}
if (oFormatCtx->oformat->flags & AVFMT_GLOBALHEADER) {
oFormatCtx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
}
value = avcodec_open2(EncoderCodecCtx, EncoderCodec, nullptr);
if (value < 0) {
throw runtime_error("Failed to open Encoder Codec\n");
}
//find free stream index
outVideoStreamIndx = -1;
for (int i = 0; i < oFormatCtx->nb_streams; i++) {
if (oFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
outVideoStreamIndx = i;
}
}
if (outVideoStreamIndx < 0) {
throw runtime_error("Error: cannot find a free stream for video on the output");
}
avcodec_parameters_from_context(stream->codecpar, EncoderCodecCtx);
return 1;
}
/** AUDIO **/
int Recorder::OpenAudioDevice() {
value = 0;
AudioOptions = nullptr;
AudioInFCtx = avformat_alloc_context();
if (AudioInFCtx == nullptr) {
throw runtime_error("Cannot allocate memory for audio input context\n");
}
av_dict_set(&AudioOptions, "async", "25", 0);
#ifdef WIN32
audioIFormat = const_cast<AVInputFormat *>(av_find_input_format("dshow"));
av_dict_set(&AudioOptions, "sample_rate", "44100", 0);
//Windows = Microfono (Realtek Audio)
value = avformat_open_input(&AudioInFCtx, audio_device.c_str(), audioIFormat, &AudioOptions);
if (value < 0) {
throw runtime_error("Cannot open Audio input Windows\n");
}
#elif defined linux
audioIFormat = const_cast<AVInputFormat *>(av_find_input_format("alsa"));
av_dict_set(&AudioOptions, "sample_rate", "44100", 0);
//Linux = hw:0,0
value = avformat_open_input(&AudioInFCtx, audio_device.c_str(), audioIFormat, &AudioOptions);
if(value < 0 ){
throw runtime_error("Cannot open Audio input\n");
}
#endif
return 1;
}
int Recorder::InitializeAudioDecoder() {
value = avformat_find_stream_info(AudioInFCtx, &AudioOptions);
if (value < 0) {
throw runtime_error("Failed to retrieve input stream info\n");
}
value = av_find_best_stream(AudioInFCtx, AVMEDIA_TYPE_AUDIO, -1, -1, nullptr, 0);
if (value < 0) {
throw runtime_error("Failed to retrieve input audio stream info\n");
}
AudioStreamIndx = -1;
/* find the first video stream index . Also there is an API available to do the below operations */
for (int i = 0; i < AudioInFCtx->nb_streams; i++) {// find video stream position/index.
if (AudioInFCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
AVCodecParameters *iLocalCodecParams = nullptr;
iLocalCodecParams = AudioInFCtx->streams[i]->codecpar;
const AVCodec *iLocalCodec = nullptr;
iLocalCodec = avcodec_find_decoder(iLocalCodecParams->codec_id);
if (iLocalCodec == nullptr) {
cout << "Unsupported Codec\n";
continue;
}
if (iLocalCodecParams->codec_type == AVMEDIA_TYPE_AUDIO) {
if (AudioStreamIndx == -1) {
AudioStreamIndx = i;
AudioDecoderCodec = iLocalCodec;
AudioDecoderCodecParams = iLocalCodecParams;
}
}
}
}
/** AUDIO **/
if (AudioStreamIndx == -1) {
throw runtime_error("\nunable to find the Audio stream index. (-1)");
}
AudioDecoderCodecCtx = avcodec_alloc_context3(AudioDecoderCodec);
if (!AudioDecoderCodecCtx) {
throw runtime_error("Failed to allocate memory for Audio AVCodecContext\n");
}
value = avcodec_parameters_to_context(AudioDecoderCodecCtx, AudioDecoderCodecParams);
if (value < 0) {
throw runtime_error("Failed to copy Audio decoderCodec params to Audio decoderCodecCtx\n");
}
value = avcodec_open2(AudioDecoderCodecCtx, AudioDecoderCodec, nullptr);
if (value < 0) {
throw runtime_error("Failed to open Audio DecoderCodec!\n");
}
return 1;
}
int Recorder::SetUp_AudioEncoder() {
AudioEncoderCodec = nullptr;
AudioEncoderCodec = avcodec_find_encoder(oformat->audio_codec);
if (!AudioEncoderCodec) {
throw runtime_error("Can't create EncoderCodec\n");
}
/** Returns the first available "slot" in oFormatCtx->streams (here = ->streams[1] **/
audio_stream = avformat_new_stream(oFormatCtx, AudioEncoderCodec);
if (!audio_stream) {
throw runtime_error("Can't create stream for this format\n");
}
AudioEncoderCodecCtx = avcodec_alloc_context3(AudioEncoderCodec);
if (!AudioEncoderCodecCtx) {
throw runtime_error("Can't create EncoderCodec Context\n");
}
if (AudioEncoderCodec->supported_samplerates) {
AudioEncoderCodecCtx->sample_rate = AudioEncoderCodec->supported_samplerates[0];
for (int i = 0; i < AudioEncoderCodec->supported_samplerates[i]; i++) {
if (AudioEncoderCodec->supported_samplerates[i] == AudioDecoderCodecCtx->sample_rate) {
AudioEncoderCodecCtx->sample_rate = AudioDecoderCodecCtx->sample_rate;
}
}
}
AudioEncoderCodecCtx->codec_id = AudioEncoderCodec->id;
AudioEncoderCodecCtx->sample_fmt = AudioEncoderCodec->sample_fmts ? AudioEncoderCodec->sample_fmts[0]
: AV_SAMPLE_FMT_FLTP;
AudioEncoderCodecCtx->channels = AudioDecoderCodecCtx->channels;
AudioEncoderCodecCtx->channel_layout = av_get_default_channel_layout(AudioEncoderCodecCtx->channels);
AudioEncoderCodecCtx->bit_rate = 128000; //96000
AudioEncoderCodecCtx->time_base = (AVRational) {1, AudioDecoderCodecCtx->sample_rate};
AudioEncoderCodecCtx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
audio_stream->time_base = (AVRational) {1, AudioDecoderCodecCtx->sample_rate};
/** Already in Video Encoder SetUp **/
if (oFormatCtx->oformat->flags & AVFMT_GLOBALHEADER) {
oFormatCtx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
}
if (avcodec_open2(AudioEncoderCodecCtx, AudioEncoderCodec, nullptr) < 0) {
throw runtime_error("Error in opening the audio encoder codec!\n");
}
//find free stream index
outAudioStreamIndx = -1;
for (int i = 0; i < oFormatCtx->nb_streams; i++) {
if (oFormatCtx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_UNKNOWN) {
outAudioStreamIndx = i;
}
}
if (outAudioStreamIndx < 0) {
throw runtime_error("Error: cannot find a free stream for audio on the output");
}
/** Copy EncoderCodecCtx codec parameters into audio_stream (= oFormatCtx->streams[1]) **/
avcodec_parameters_from_context(audio_stream->codecpar, AudioEncoderCodecCtx);
return 1;
}
/** DECODING & ENCODING **/
void Recorder::PrepareVideoDecEnc() {
pFrame = av_frame_alloc();
if (pFrame == nullptr) {
throw runtime_error("Could not allocate frame \n");
}
sws_ctx = nullptr;
// set up our SWSContext to convert the image data to YUV420:
sws_ctx = sws_getContext(
DecoderCodecCtx->width,
DecoderCodecCtx->height,
DecoderCodecCtx->pix_fmt,
EncoderCodecCtx->width,
EncoderCodecCtx->height,
AV_PIX_FMT_YUV420P,
SWS_FAST_BILINEAR,
nullptr,
nullptr,
nullptr
);
if (sws_ctx == nullptr)
throw runtime_error("Error during allocation of sws_ctx");
/**
* As we said before, we are using YV12 to display the image, and getting
* YUV420 data from ffmpeg.
*/
int numBytes;
uint8_t *buffer = nullptr;
numBytes = av_image_get_buffer_size(
AV_PIX_FMT_YUV420P,
DecoderCodecCtx->width,
DecoderCodecCtx->height,
32
);
if (numBytes < 0)
throw runtime_error("Cannot get a buffer size\n");
buffer = (uint8_t *) av_malloc(numBytes * sizeof(uint8_t));
if (buffer == nullptr)
throw runtime_error("Cannot allocate the buffer\n");
pict = av_frame_alloc();
if (pict == nullptr)
throw runtime_error("Cannot allocate pict\n");
int err = av_image_fill_arrays(
pict->data,
pict->linesize,
buffer,
AV_PIX_FMT_YUV420P,
DecoderCodecCtx->width,
DecoderCodecCtx->height,
32
);
if (err < 0) {
av_frame_unref(pict);
av_frame_free(&pict);
av_free(&buffer);
throw runtime_error("Cannot fill image\n");
}
}
int Recorder::PrepareAudioDecEnc(AVAudioFifo **audio_fifo, AVPacket **pAudioPacket, AVPacket **outAudioPacket,
AVFrame **pAudioFrame, AVFrame **outAudioFrame, SwrContext **resampleContext) {
/* Create the FIFO buffer based on the specified output sample format. */
if (!(*audio_fifo = av_audio_fifo_alloc(AudioEncoderCodecCtx->sample_fmt,
AudioEncoderCodecCtx->channels, 1))) {
throw runtime_error("Could not allocate FIFO\n");
}
//allocate space for a packet
*pAudioPacket = (AVPacket *) av_malloc(sizeof(AVPacket));
if (!*pAudioPacket) {
throw runtime_error("Cannot allocate an AVPacket for encoded audio\n");
}
*pAudioPacket = av_packet_alloc();
if (*pAudioPacket == nullptr) {
throw runtime_error("Cannot allocate an AVPacket for encoded audio\n");
}
//allocate space for a frame
*pAudioFrame = av_frame_alloc();
if (!*pAudioFrame) {
throw runtime_error("Cannot allocate an AVFrame for encoded audio\n");
}
*outAudioFrame = av_frame_alloc();
if (!*outAudioFrame) {
throw runtime_error("Cannot allocate an AVFrame for encoded audio\n");
}
*outAudioPacket = (AVPacket *) av_malloc(sizeof(AVPacket));
if (!outAudioPacket) {
throw runtime_error("Cannot allocate an AVPacket for encoded video\n");
}
//init the resampler
*resampleContext = nullptr;
*resampleContext = swr_alloc_set_opts(*resampleContext,
av_get_default_channel_layout(AudioEncoderCodecCtx->channels),
AudioEncoderCodecCtx->sample_fmt,
AudioEncoderCodecCtx->sample_rate,
av_get_default_channel_layout(AudioDecoderCodecCtx->channels),
AudioDecoderCodecCtx->sample_fmt,
AudioDecoderCodecCtx->sample_rate,
0,
nullptr);
/** Perform a sanity check so that the number of converted samples is
* not greater than the number of samples to be converted.
* If the sample rates differ, this case has to be handled differently
**/
if (!*resampleContext) {
throw runtime_error("Cannot allocate the resample context\n");
}
if ((swr_init(*resampleContext)) < 0) {
swr_free(resampleContext);
throw runtime_error("Could not open resample context\n");
}
return 0;
}
bool Recorder::isEndVideo() {
lock_guard<mutex> lg_videoEnd(_videoEnd);
return videoEnd;
}
void Recorder::endVideo() {
lock_guard<mutex> lg_videoEnd(_videoEnd);
videoEnd = true;
if (audio)
cv_audio.notify_all();
}
void Recorder::endAudio() {
lock_guard<mutex> lg(_audio);
audioEnd = true;
}
void Recorder::synchWithAudio() {
if (audio) {
unique_lock<mutex> ul_videoSynch(_video);
videoReady = true;
std::cout << "Video Ready" << endl;
cv_video.wait(ul_videoSynch, [this]() { return audioReady; });
cv_audio.notify_all();
ul_videoSynch.unlock();
std::cout << "Video Started" << endl;
}
}
void Recorder::synchWithVideo() {
unique_lock<mutex> ul_audioSynch(_audio);
audioReady = true;
cout << "Audio Ready" << endl;
cv_audio.wait(ul_audioSynch, [this]() { return videoReady; });
cv_video.notify_all();
ul_audioSynch.unlock();
cout << "Audio Started" << endl;
}
void Recorder::acquireVideoFrames() {
AVPacket *pPacket;
int retry = 2;
while (retry) {
try {
PrepareVideoDecEnc();
break;
} catch (const std::exception &e) {
retry--;
if (!retry) {
cerr << e.what() << endl;
exit(-3);
}
}
}
int retValue;
int remainingPackets = 30; // to add the packets after end is pressed
avformat_close_input(&iFormatCtx);
if (iFormatCtx != nullptr) {
cerr << "Failed to clear the video format context (clearing internal buffer)\n" << endl;
exit(-5);
}
try {
OpenVideoDevice();
} catch (const std::exception &e) {
cerr << e.what() << endl;
exit(-2);
}
if(audio)
synchWithAudio();
else
cout << "Video Started" << endl;
try {
while (remainingPackets != 0) {
if (pauseRecording) {
unique_lock<mutex> ul_pause(pause_lock);
avformat_close_input(&iFormatCtx);
if (iFormatCtx != nullptr) {
throw runtime_error("Unable to close the video input\n");
}
cv_pause.wait(ul_pause, [this]() { return !pauseRecording || stopRecording; });
ul_pause.unlock();
cv_pause.notify_all();
try {
OpenVideoDevice();
} catch (const std::exception &e) {
throw e;
}
if(audio)
synchWithAudio();
else
cout << "Video Started"<<endl;
}
unique_lock<mutex> ul_stop(_lock);
if (stopRecording) {
if (retValue >= 0) {
remainingPackets--;
}
}
ul_stop.unlock();
pPacket = av_packet_alloc();
if (pPacket == nullptr) {
throw runtime_error("Could not alloc packet,\n");
}
retValue = av_read_frame(iFormatCtx, pPacket);
if (retValue >= 0 && pPacket->size > 0) {
unique_lock<mutex> ul_queue(queue_lock);
ReadRawPacketsQ.push(pPacket);
ul_queue.unlock();
} // end of prim while
}
}catch (const std::exception &e){
cerr << e.what() << endl;
outFile << e.what() << endl;
// cout << "VIDEO ENDING" << endl;
unique_lock<mutex> lk_stop (_lock);
stopRecording = true;
lk_stop.unlock();
endVideo();
throw;
}
endVideo();
// cout << "VIDEO ENDING" << endl;
}
void Recorder::encodeDecodeVideoStream() {
AVPacket *pPacket;
AVPacket *outPacket;
int i = 1, j = 1, retSend, retReceive;
try {
while (true) {
unique_lock<mutex> ul_queue(queue_lock);
if (!ReadRawPacketsQ.empty()) {
pPacket = ReadRawPacketsQ.front();
ReadRawPacketsQ.pop();
ul_queue.unlock();
if (pPacket->stream_index == VideoStreamIndx) {
retSend = avcodec_send_packet(DecoderCodecCtx, pPacket);
av_packet_unref(pPacket);
av_packet_free(&pPacket);
if (retSend < 0) {
throw runtime_error("Error sending packet for decoding.\n");
}
}
retReceive = avcodec_receive_frame(DecoderCodecCtx, pFrame);
if (retReceive == 0) {
// Convert the image into YUV format that SDL uses:
// We change the conversion format to PIX_FMT_YUV420P, and we
// use sws_scale just like before.
sws_scale(sws_ctx, pFrame->data, pFrame->linesize, 0, DecoderCodecCtx->height, pict->data,
pict->linesize);
pict->pts = (int64_t) j * stream->time_base.den / (int64_t) fps;
j++;
pict->format = EncoderCodecCtx->pix_fmt;
pict->width = EncoderCodecCtx->width;
pict->height = EncoderCodecCtx->height;
retSend = avcodec_send_frame(EncoderCodecCtx, pict);
if (retSend >= 0) {
outPacket = av_packet_alloc();
if (outPacket == nullptr) {
throw runtime_error("Cannot allocate packet!\n");
}
outPacket->data = nullptr;
outPacket->size = 0;
outPacket->flags |= AV_PKT_FLAG_KEY;
retReceive = avcodec_receive_packet(EncoderCodecCtx, outPacket);
if (retReceive == 0) {
if (!firstVideoPacket)
firstVideoPacket = true;
outPacket->pts = (int64_t) i * stream->time_base.den / (int64_t) fps;
outPacket->dts = (int64_t) i * stream->time_base.den / (int64_t) fps;
outPacket->stream_index = outVideoStreamIndx;
{
lock_guard<mutex> w_lk(write_lock);
outFile << "Write video frame " << "(size= " << outPacket->size / 1000 << " )"
<< " PTS = "
<< outPacket->pts << endl;
if (av_interleaved_write_frame(oFormatCtx, outPacket) != 0) {
cout << "\nerror in writing video frame";
}
}
i++;
}
av_packet_unref(outPacket);
}
} else {
throw runtime_error("Error while decoding.\n");
}
} else {
ul_queue.unlock();
unique_lock<mutex> ul_end(_lock);
if (stopRecording) {
ul_end.unlock();
ul_queue.lock();
if (ReadRawPacketsQ.empty() && isEndVideo()) {
ul_queue.unlock();
/** FLUSHING DECODER **/
AVPacket *pkt;
pkt = av_packet_alloc();
pkt->data = nullptr;
pkt->size = 0;
for (int k = i;; k++) {
avcodec_send_frame(EncoderCodecCtx, nullptr);
if (avcodec_receive_packet(EncoderCodecCtx, pkt) == 0) {
pkt->pts = (int64_t) k * stream->time_base.den / (int64_t) fps;
pkt->dts = (int64_t) k * stream->time_base.den / (int64_t) fps;
pkt->stream_index = outVideoStreamIndx;
av_interleaved_write_frame(oFormatCtx, pkt);
outFile << "--- flushing video encoder ---" << endl;
} else {
av_packet_unref(pkt);
av_packet_free(&pkt);
break;
}
}
break;
}
ul_queue.unlock();