/*
 * Copyright (C) 2020, KylinSoft Co., Ltd.
 *
 * This program 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.
 *
 * This program 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
#include "SourceSink.h"
#include <cassert>
#include <algorithm>

BaseSource::BaseSource()
{

}

BaseSource::~BaseSource()
{
    SharedLock lock(&m_shared_data);
    for (SinkData &s: lock->m_sinks) {
       s.sink->m_source = NULL;
    }
}

BaseSink::BaseSink()
{
    m_source = NULL;
    m_priority = 0;
}

BaseSink::~BaseSink()
{
    assert(m_source == NULL);
}

void BaseSink::ConnectBaseSource(BaseSource *source, int priority)
{
    if (m_source == source && m_priority == priority)
        return;
    if (m_source != NULL) {
        BaseSource::SharedLock lock(&m_source->m_shared_data);
        for(auto it = lock->m_sinks.begin(); it != lock->m_sinks.end(); ++it) {
            if (it->sink == this) {
                lock->m_sinks.erase(it);
                break;
            }
        }
    }
    m_source = source;
    if (m_source != NULL) {
        BaseSource::SharedLock lock(&m_source->m_shared_data);
        BaseSource::SinkData data(this, priority);
        auto it = std::upper_bound(lock->m_sinks.begin(), lock->m_sinks.end(), data);
        lock->m_sinks.insert(it, data);
    }
}


int64_t VideoSource::CalculateNextVideoTimestamp()
{
    SharedLock lock(&m_shared_data);
    for (SinkData &s: lock->m_sinks) {
        int64_t timestamp = static_cast<VideoSink*>(s.sink)->GetNextVideoTimestamp();
        if (timestamp != SINK_TIMESTAMP_NONE)
            return timestamp;
    }
    return SINK_TIMESTAMP_NONE;
}

void VideoSource::PushVideoFrame(unsigned int width, unsigned int height, const uint8_t *data, int stride, AVPixelFormat format, int64_t timestamp)
{
    SharedLock lock(&m_shared_data);
    for (SinkData &s: lock->m_sinks) {
        static_cast<VideoSink*>(s.sink)->ReadVideoFrame(width, height, data, stride, format, timestamp);
    }
}

void VideoSource::PushVideoPing(int64_t timestamp)
{
    SharedLock lock(&m_shared_data);
    for (SinkData &s: lock->m_sinks) {
        static_cast<VideoSink*>(s.sink)->ReadVideoPing(timestamp);
    }
}

void AudioSource::PushAudioSamples(unsigned int channels, unsigned int sample_rate, AVSampleFormat format, unsigned int sample_count, const uint8_t *data, int64_t timestamp)
{
    SharedLock lock(&m_shared_data);
    for (SinkData &s: lock->m_sinks) {
        static_cast<AudioSink*>(s.sink)->ReadAudioSamples(channels, sample_rate, format, sample_count, data, timestamp);
    }
}

void AudioSource::PushAudioHole()
{
    SharedLock lock(&m_shared_data);
    for (SinkData &s: lock->m_sinks) {
        static_cast<AudioSink*>(s.sink)->ReadAudioHole();
    }
}



























