kopia lustrzana https://github.com/f4exb/sdrangel
788 wiersze
22 KiB
C++
788 wiersze
22 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2018 F4HKW //
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// for F4EXB / SDRAngel //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <math.h>
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#include <algorithm>
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extern "C"
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{
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#include <libswresample/swresample.h>
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}
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#include "audio/audiofifo.h"
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#include "datvideorender.h"
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DATVideoRender::DATVideoRender(QWidget *parent) : TVScreen(true, parent)
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{
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installEventFilter(this);
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m_isFullScreen = false;
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m_running = false;
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m_isFFMPEGInitialized = false;
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m_isOpen = false;
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m_formatCtx = nullptr;
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m_videoDecoderCtx = nullptr;
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m_swsCtx = nullptr;
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m_audioFifo = nullptr;
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m_audioSWR = nullptr;
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m_audioSampleRate = 48000;
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m_audioFifoBufferIndex = 0;
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m_videoStreamIndex = -1;
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m_audioStreamIndex = -1;
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m_audioMute = false;
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m_videoMute = false;
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m_audioVolume = 0;
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m_updateAudioResampler = false;
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m_currentRenderWidth = -1;
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m_currentRenderHeight = -1;
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m_frame = nullptr;
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m_frameCount = -1;
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// for (int i = 0; i < m_audioFifoBufferSize; i++)
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// {
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// m_audioFifoBuffer[2*i] = 8192.0f * sin((M_PI * i)/(m_audioFifoBufferSize/1000.0f));
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// m_audioFifoBuffer[2*i+1] = m_audioFifoBuffer[2*i];
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// }
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}
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DATVideoRender::~DATVideoRender()
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{
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if (m_audioSWR) {
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swr_free(&m_audioSWR);
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}
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}
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bool DATVideoRender::eventFilter(QObject *obj, QEvent *event)
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{
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if (event->type() == QEvent::MouseButtonRelease)
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{
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SetFullScreen(false);
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return true;
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}
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else
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{
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// standard event processing
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return QObject::eventFilter(obj, event);
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}
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}
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void DATVideoRender::SetFullScreen(bool fullScreen)
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{
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if (m_isFullScreen == fullScreen)
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{
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return;
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}
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if (fullScreen == true)
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{
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setWindowFlags(Qt::Window);
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setWindowState(Qt::WindowFullScreen);
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show();
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m_isFullScreen = true;
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}
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else
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{
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setWindowFlags(Qt::Widget);
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setWindowState(Qt::WindowNoState);
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show();
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m_isFullScreen = false;
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}
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}
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static int ReadFunction(void *opaque, uint8_t *buf, int buf_size)
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{
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QIODevice *stream = reinterpret_cast<QIODevice *>(opaque);
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int nbBytes = stream->read((char *)buf, buf_size);
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return nbBytes;
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}
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static int64_t SeekFunction(void *opaque, int64_t offset, int whence)
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{
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QIODevice *stream = reinterpret_cast<QIODevice *>(opaque);
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if (whence == AVSEEK_SIZE)
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{
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return -1;
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}
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if (stream->isSequential())
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{
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return -1;
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}
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if (stream->seek(offset) == false)
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{
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return -1;
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}
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return stream->pos();
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}
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void DATVideoRender::ResetMetaData()
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{
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MetaData.CodecID = -1;
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MetaData.PID = -1;
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MetaData.Program = "";
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MetaData.Stream = "";
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MetaData.Width = -1;
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MetaData.Height = -1;
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MetaData.BitRate = -1;
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MetaData.Channels = -1;
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MetaData.CodecDescription = "";
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MetaData.OK_Decoding = false;
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MetaData.OK_TransportStream = false;
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MetaData.OK_VideoStream = false;
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emit onMetaDataChanged(&MetaData);
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}
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bool DATVideoRender::InitializeFFMPEG()
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{
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ResetMetaData();
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if (m_isFFMPEGInitialized)
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{
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return false;
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}
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avcodec_register_all();
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av_register_all();
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av_log_set_level(AV_LOG_FATAL);
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//av_log_set_level(AV_LOG_ERROR);
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m_isFFMPEGInitialized = true;
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return true;
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}
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bool DATVideoRender::PreprocessStream()
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{
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AVDictionary *opts = nullptr;
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AVCodec *videoCodec = nullptr;
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AVCodec *audioCodec = nullptr;
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int intRet = -1;
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char *buffer = nullptr;
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//Identify stream
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if (avformat_find_stream_info(m_formatCtx, nullptr) < 0)
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{
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avformat_close_input(&m_formatCtx);
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m_formatCtx = nullptr;
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qDebug() << "DATVideoProcess::PreprocessStream cannot find stream info";
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return false;
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}
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//Find video stream
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intRet = av_find_best_stream(m_formatCtx, AVMEDIA_TYPE_VIDEO, -1, -1, nullptr, 0);
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if (intRet < 0)
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{
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avformat_close_input(&m_formatCtx);
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qDebug() << "DATVideoProcess::PreprocessStream cannot find video stream";
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return false;
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}
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m_videoStreamIndex = intRet;
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//Find audio stream
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intRet = av_find_best_stream(m_formatCtx, AVMEDIA_TYPE_AUDIO, -1, -1, nullptr, 0);
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if (intRet < 0)
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{
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qDebug() << "DATVideoProcess::PreprocessStream cannot find audio stream";
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}
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m_audioStreamIndex = intRet;
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// Prepare Video Codec and extract meta data
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AVCodecParameters *parms = m_formatCtx->streams[m_videoStreamIndex]->codecpar;
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if (m_videoDecoderCtx) {
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avcodec_free_context(&m_videoDecoderCtx);
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}
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m_videoDecoderCtx = avcodec_alloc_context3(NULL);
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avcodec_parameters_to_context(m_videoDecoderCtx, parms);
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// m_videoDecoderCtx = m_formatCtx->streams[m_videoStreamIndex]->codec; // old style
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//Meta Data
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MetaData.PID = m_formatCtx->streams[m_videoStreamIndex]->id;
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MetaData.CodecID = m_videoDecoderCtx->codec_id;
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MetaData.OK_TransportStream = true;
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MetaData.Program = "";
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MetaData.Stream = "";
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if (m_formatCtx->programs)
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{
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buffer = nullptr;
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av_dict_get_string(m_formatCtx->programs[m_videoStreamIndex]->metadata, &buffer, ':', '\n');
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if (buffer != nullptr)
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{
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MetaData.Program = QString("%1").arg(buffer);
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}
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}
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buffer = nullptr;
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av_dict_get_string(m_formatCtx->streams[m_videoStreamIndex]->metadata, &buffer, ':', '\n');
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if (buffer != nullptr)
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{
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MetaData.Stream = QString("%1").arg(buffer);
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}
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emit onMetaDataChanged(&MetaData);
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//Decoder
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videoCodec = avcodec_find_decoder(m_videoDecoderCtx->codec_id);
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if (videoCodec == nullptr)
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{
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avformat_close_input(&m_formatCtx);
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m_formatCtx = nullptr;
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qDebug() << "DATVideoProcess::PreprocessStream cannot find associated video CODEC";
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return false;
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}
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else
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{
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qDebug() << "DATVideoProcess::PreprocessStream: video CODEC found: " << videoCodec->name;
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}
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av_dict_set(&opts, "refcounted_frames", "1", 0);
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if (avcodec_open2(m_videoDecoderCtx, videoCodec, &opts) < 0)
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{
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avformat_close_input(&m_formatCtx);
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m_formatCtx = nullptr;
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qDebug() << "DATVideoProcess::PreprocessStream cannot open associated video CODEC";
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return false;
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}
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//Allocate Frame
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m_frame = av_frame_alloc();
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if (!m_frame)
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{
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avformat_close_input(&m_formatCtx);
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m_formatCtx = nullptr;
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qDebug() << "DATVideoProcess::PreprocessStream cannot allocate frame";
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return false;
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}
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m_frameCount = 0;
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MetaData.Width = m_videoDecoderCtx->width;
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MetaData.Height = m_videoDecoderCtx->height;
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MetaData.BitRate = m_videoDecoderCtx->bit_rate;
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MetaData.Channels = m_videoDecoderCtx->channels;
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MetaData.CodecDescription = QString("%1").arg(videoCodec->long_name);
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MetaData.OK_VideoStream = true;
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emit onMetaDataChanged(&MetaData);
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// Prepare Audio Codec
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if (m_audioStreamIndex >= 0)
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{
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AVCodecParameters *parms = m_formatCtx->streams[m_audioStreamIndex]->codecpar;
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if (m_audioDecoderCtx) {
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avcodec_free_context(&m_audioDecoderCtx);
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}
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m_audioDecoderCtx = avcodec_alloc_context3(NULL);
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avcodec_parameters_to_context(m_audioDecoderCtx, parms);
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//m_audioDecoderCtx = m_formatCtx->streams[m_audioStreamIndex]->codec; // old style
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qDebug() << "DATVideoProcess::PreprocessStream: audio: "
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<< " channels: " << m_audioDecoderCtx->channels
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<< " channel_layout: " << m_audioDecoderCtx->channel_layout
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<< " sample_rate: " << m_audioDecoderCtx->sample_rate
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<< " sample_fmt: " << m_audioDecoderCtx->sample_fmt
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<< " codec_id: "<< m_audioDecoderCtx->codec_id;
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audioCodec = avcodec_find_decoder(m_audioDecoderCtx->codec_id);
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if (audioCodec == nullptr)
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{
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qDebug() << "DATVideoProcess::PreprocessStream cannot find associated audio CODEC";
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m_audioStreamIndex = -1; // invalidate audio
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}
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else
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{
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qDebug() << "DATVideoProcess::PreprocessStream: audio CODEC found: " << audioCodec->name;
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if (avcodec_open2(m_audioDecoderCtx, audioCodec, nullptr) < 0)
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{
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qDebug() << "DATVideoProcess::PreprocessStream cannot open associated audio CODEC";
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m_audioStreamIndex = -1; // invalidate audio
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}
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else
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{
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setResampler();
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}
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}
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}
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return true;
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}
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bool DATVideoRender::OpenStream(DATVideostream *device)
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{
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int ioBufferSize = 32768;
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unsigned char *ptrIOBuffer = nullptr;
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AVIOContext *ioCtx = nullptr;
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if (m_running)
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{
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return false;
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}
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if (device == nullptr)
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{
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qDebug() << "DATVideoProcess::OpenStream QIODevice is nullptr";
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return false;
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}
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if (m_isOpen)
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{
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qDebug() << "DATVideoProcess::OpenStream already open";
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return false;
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}
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if (device->bytesAvailable() <= 0)
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{
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qDebug() << "DATVideoProcess::OpenStream no data available";
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MetaData.OK_Data = false;
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emit onMetaDataChanged(&MetaData);
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return false;
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}
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//Only once execution
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m_running = true;
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MetaData.OK_Data = true;
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emit onMetaDataChanged(&MetaData);
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InitializeFFMPEG();
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if (!m_isFFMPEGInitialized)
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{
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qDebug() << "DATVideoProcess::OpenStream FFMPEG not initialized";
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m_running = false;
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return false;
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}
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if (!device->open(QIODevice::ReadOnly))
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{
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qDebug() << "DATVideoProcess::OpenStream cannot open QIODevice";
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m_running = false;
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return false;
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}
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//Connect QIODevice to FFMPEG Reader
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m_formatCtx = avformat_alloc_context();
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if (m_formatCtx == nullptr)
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{
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qDebug() << "DATVideoProcess::OpenStream cannot alloc format FFMPEG context";
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m_running = false;
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return false;
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}
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ptrIOBuffer = (unsigned char *)av_malloc(ioBufferSize + AV_INPUT_BUFFER_PADDING_SIZE);
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ioCtx = avio_alloc_context(ptrIOBuffer,
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ioBufferSize,
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0,
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reinterpret_cast<void *>(device),
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&ReadFunction,
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nullptr,
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&SeekFunction);
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m_formatCtx->pb = ioCtx;
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m_formatCtx->flags |= AVFMT_FLAG_CUSTOM_IO;
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if (avformat_open_input(&m_formatCtx, nullptr, nullptr, nullptr) < 0)
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{
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qDebug() << "DATVideoProcess::OpenStream cannot open stream";
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m_running = false;
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return false;
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}
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if (!PreprocessStream())
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{
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m_running = false;
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return false;
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}
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m_isOpen = true;
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m_running = false;
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return true;
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}
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bool DATVideoRender::RenderStream()
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{
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AVPacket packet;
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int gotFrame;
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bool needRenderingSetup;
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if (!m_isOpen)
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{
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qDebug() << "DATVideoProcess::RenderStream Stream not open";
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return false;
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}
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if (m_running)
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{
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return false;
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}
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//Only once execution
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m_running = true;
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//********** Rendering **********
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if (av_read_frame(m_formatCtx, &packet) < 0)
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{
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qDebug() << "DATVideoProcess::RenderStream reading packet error";
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m_running = false;
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return false;
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}
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//Video channel
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if ((packet.stream_index == m_videoStreamIndex) && (!m_videoMute))
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{
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memset(m_frame, 0, sizeof(AVFrame));
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av_frame_unref(m_frame);
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gotFrame = 0;
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if (new_decode(m_videoDecoderCtx, m_frame, &gotFrame, &packet) < 0)
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{
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qDebug() << "DATVideoProcess::RenderStream decoding video packet error";
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m_running = false;
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return false;
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}
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if (gotFrame)
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{
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//Rendering and RGB Converter setup
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needRenderingSetup = (m_frameCount == 0);
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needRenderingSetup |= (m_swsCtx == nullptr);
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if ((m_currentRenderWidth != m_frame->width) || (m_currentRenderHeight != m_frame->height))
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{
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needRenderingSetup = true;
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}
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if (needRenderingSetup)
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{
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if (m_swsCtx != nullptr)
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{
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sws_freeContext(m_swsCtx);
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m_swsCtx = nullptr;
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}
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//Convertisseur YUV -> RGB
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m_swsCtx = sws_alloc_context();
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av_opt_set_int(m_swsCtx, "srcw", m_frame->width, 0);
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av_opt_set_int(m_swsCtx, "srch", m_frame->height, 0);
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av_opt_set_int(m_swsCtx, "src_format", m_frame->format, 0);
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av_opt_set_int(m_swsCtx, "dstw", m_frame->width, 0);
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av_opt_set_int(m_swsCtx, "dsth", m_frame->height, 0);
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av_opt_set_int(m_swsCtx, "dst_format", AV_PIX_FMT_RGB24, 0);
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av_opt_set_int(m_swsCtx, "sws_flag", SWS_FAST_BILINEAR /* SWS_BICUBIC*/, 0);
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if (sws_init_context(m_swsCtx, nullptr, nullptr) < 0)
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{
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qDebug() << "DATVideoProcess::RenderStream cannont init video data converter";
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m_swsCtx = nullptr;
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m_running = false;
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return false;
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}
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if ((m_currentRenderHeight > 0) && (m_currentRenderWidth > 0))
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{
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//av_freep(&m_pbytDecodedData[0]);
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//av_freep(&m_pintDecodedLineSize[0]);
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}
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if (av_image_alloc(m_pbytDecodedData, m_pintDecodedLineSize, m_frame->width, m_frame->height, AV_PIX_FMT_RGB24, 1) < 0)
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{
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qDebug() << "DATVideoProcess::RenderStream cannont init video image buffer";
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sws_freeContext(m_swsCtx);
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m_swsCtx = nullptr;
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m_running = false;
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return false;
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}
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//Rendering device setup
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resizeTVScreen(m_frame->width, m_frame->height);
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update();
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resetImage();
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m_currentRenderWidth = m_frame->width;
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m_currentRenderHeight = m_frame->height;
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MetaData.Width = m_frame->width;
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MetaData.Height = m_frame->height;
|
|
MetaData.OK_Decoding = true;
|
|
emit onMetaDataChanged(&MetaData);
|
|
}
|
|
|
|
//Frame rendering
|
|
|
|
if (sws_scale(m_swsCtx, m_frame->data, m_frame->linesize, 0, m_frame->height, m_pbytDecodedData, m_pintDecodedLineSize) < 0)
|
|
{
|
|
qDebug() << "DATVideoProcess::RenderStream error converting video frame to RGB";
|
|
m_running = false;
|
|
return false;
|
|
}
|
|
|
|
renderImage(m_pbytDecodedData[0]);
|
|
av_frame_unref(m_frame);
|
|
m_frameCount++;
|
|
}
|
|
}
|
|
// Audio channel
|
|
else if ((packet.stream_index == m_audioStreamIndex) && (m_audioFifo) && (swr_is_initialized(m_audioSWR)) && (!m_audioMute))
|
|
{
|
|
if (m_updateAudioResampler)
|
|
{
|
|
setResampler();
|
|
m_updateAudioResampler = false;
|
|
}
|
|
|
|
memset(m_frame, 0, sizeof(AVFrame));
|
|
av_frame_unref(m_frame);
|
|
gotFrame = 0;
|
|
|
|
if (new_decode(m_audioDecoderCtx, m_frame, &gotFrame, &packet) >= 0)
|
|
//if (avcodec_decode_audio4(m_audioDecoderCtx, m_frame, &gotFrame, &packet) >= 0) // old style
|
|
{
|
|
if (gotFrame)
|
|
{
|
|
int16_t *audioBuffer;
|
|
av_samples_alloc((uint8_t**) &audioBuffer, nullptr, 2, m_frame->nb_samples, AV_SAMPLE_FMT_S16, 0);
|
|
int frame_count = swr_convert(m_audioSWR, (uint8_t**) &audioBuffer, m_frame->nb_samples, (const uint8_t**) m_frame->data, m_frame->nb_samples);
|
|
|
|
// direct writing:
|
|
// int ret = m_audioFifo->write((const quint8*) &audioBuffer[0], frame_count);
|
|
|
|
// if (ret < frame_count) {
|
|
// qDebug("DATVideoRender::RenderStream: audio frames missing %d vs %d", ret, frame_count);
|
|
// }
|
|
|
|
// buffered writing:
|
|
// if (m_audioFifoBufferIndex + frame_count < m_audioFifoBufferSize)
|
|
// {
|
|
// std::copy(&audioBuffer[0], &audioBuffer[2*frame_count], &m_audioFifoBuffer[2*m_audioFifoBufferIndex]);
|
|
// m_audioFifoBufferIndex += frame_count;
|
|
// }
|
|
// else
|
|
// {
|
|
// int remainder = m_audioFifoBufferSize - m_audioFifoBufferIndex;
|
|
// std::copy(&audioBuffer[0], &audioBuffer[2*remainder], &m_audioFifoBuffer[2*m_audioFifoBufferIndex]);
|
|
// m_audioFifo->write((const quint8*) &m_audioFifoBuffer[0], m_audioFifoBufferSize);
|
|
// std::copy(&audioBuffer[2*remainder], &audioBuffer[2*frame_count], &m_audioFifoBuffer[0]);
|
|
// m_audioFifoBufferIndex = frame_count - remainder;
|
|
// }
|
|
|
|
// Apply volume:
|
|
for (int i = 0; i < frame_count; i++)
|
|
{
|
|
m_audioFifoBuffer[2*m_audioFifoBufferIndex] = m_audioVolume * audioBuffer[2*i];
|
|
m_audioFifoBuffer[2*m_audioFifoBufferIndex+1] = m_audioVolume * audioBuffer[2*i+1];
|
|
m_audioFifoBufferIndex++;
|
|
|
|
if (m_audioFifoBufferIndex >= m_audioFifoBufferSize)
|
|
{
|
|
m_audioFifo->write((const quint8*) &m_audioFifoBuffer[0], m_audioFifoBufferSize);
|
|
m_audioFifoBufferIndex = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
qDebug("DATVideoRender::RenderStream: audio decode error");
|
|
}
|
|
}
|
|
|
|
av_packet_unref(&packet);
|
|
|
|
//********** Rendering **********
|
|
|
|
m_running = false;
|
|
|
|
return true;
|
|
}
|
|
|
|
void DATVideoRender::setAudioVolume(int audioVolume)
|
|
{
|
|
int audioVolumeConstrained = audioVolume < 0 ? 0 : audioVolume > 100 ? 100 : audioVolume;
|
|
m_audioVolume = audioVolumeConstrained / 100.0f;
|
|
}
|
|
|
|
void DATVideoRender::setResampler()
|
|
{
|
|
if (m_audioSWR) {
|
|
swr_free(&m_audioSWR);
|
|
}
|
|
|
|
m_audioSWR = swr_alloc();
|
|
av_opt_set_int(m_audioSWR, "in_channel_count", m_audioDecoderCtx->channels, 0);
|
|
av_opt_set_int(m_audioSWR, "out_channel_count", 2, 0);
|
|
av_opt_set_int(m_audioSWR, "in_channel_layout", m_audioDecoderCtx->channel_layout, 0);
|
|
av_opt_set_int(m_audioSWR, "out_channel_layout", AV_CH_LAYOUT_STEREO, 0);
|
|
av_opt_set_int(m_audioSWR, "in_sample_rate", m_audioDecoderCtx->sample_rate, 0);
|
|
av_opt_set_int(m_audioSWR, "out_sample_rate", m_audioSampleRate, 0);
|
|
av_opt_set_sample_fmt(m_audioSWR, "in_sample_fmt", m_audioDecoderCtx->sample_fmt, 0);
|
|
av_opt_set_sample_fmt(m_audioSWR, "out_sample_fmt", AV_SAMPLE_FMT_S16, 0);
|
|
|
|
swr_init(m_audioSWR);
|
|
|
|
qDebug() << "DATVideoRender::setResampler: "
|
|
<< " in_channel_count: " << m_audioDecoderCtx->channels
|
|
<< " out_channel_count: " << 2
|
|
<< " in_channel_layout: " << m_audioDecoderCtx->channel_layout
|
|
<< " out_channel_layout: " << AV_CH_LAYOUT_STEREO
|
|
<< " in_sample_rate: " << m_audioDecoderCtx->sample_rate
|
|
<< " out_sample_rate: " << m_audioSampleRate
|
|
<< " in_sample_fmt: " << m_audioDecoderCtx->sample_fmt
|
|
<< " out_sample_fmt: " << AV_SAMPLE_FMT_S16;
|
|
}
|
|
|
|
bool DATVideoRender::CloseStream(QIODevice *device)
|
|
{
|
|
|
|
if (m_running)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (!device)
|
|
{
|
|
qDebug() << "DATVideoProcess::CloseStream QIODevice is nullptr";
|
|
return false;
|
|
}
|
|
|
|
if (!m_isOpen)
|
|
{
|
|
qDebug() << "DATVideoProcess::CloseStream Stream not open";
|
|
return false;
|
|
}
|
|
|
|
if (!m_formatCtx)
|
|
{
|
|
qDebug() << "DATVideoProcess::CloseStream FFMEG Context is not initialized";
|
|
return false;
|
|
}
|
|
|
|
//Only once execution
|
|
m_running = true;
|
|
|
|
// maybe done in the avcodec_close
|
|
// avformat_close_input(&m_formatCtx);
|
|
// m_formatCtx=nullptr;
|
|
|
|
if (m_videoDecoderCtx)
|
|
{
|
|
avcodec_close(m_videoDecoderCtx);
|
|
m_videoDecoderCtx = nullptr;
|
|
}
|
|
|
|
if (m_frame)
|
|
{
|
|
av_frame_unref(m_frame);
|
|
av_frame_free(&m_frame);
|
|
}
|
|
|
|
if (m_swsCtx != nullptr)
|
|
{
|
|
sws_freeContext(m_swsCtx);
|
|
m_swsCtx = nullptr;
|
|
}
|
|
|
|
device->close();
|
|
m_isOpen = false;
|
|
m_running = false;
|
|
m_currentRenderWidth = -1;
|
|
m_currentRenderHeight = -1;
|
|
|
|
ResetMetaData();
|
|
emit onMetaDataChanged(&MetaData);
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Replacement of deprecated avcodec_decode_video2 with the same signature
|
|
* https://blogs.gentoo.org/lu_zero/2016/03/29/new-avcodec-api/
|
|
*/
|
|
int DATVideoRender::new_decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
|
|
{
|
|
int ret;
|
|
|
|
*got_frame = 0;
|
|
|
|
if (pkt)
|
|
{
|
|
ret = avcodec_send_packet(avctx, pkt);
|
|
// In particular, we don't expect AVERROR(EAGAIN), because we read all
|
|
// decoded frames with avcodec_receive_frame() until done.
|
|
if (ret < 0)
|
|
{
|
|
return ret == AVERROR_EOF ? 0 : ret;
|
|
}
|
|
}
|
|
|
|
ret = avcodec_receive_frame(avctx, frame);
|
|
|
|
if (ret < 0 && ret != AVERROR(EAGAIN) && ret != AVERROR_EOF)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
if (ret >= 0)
|
|
{
|
|
*got_frame = 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|