Source/WebCore/platform/graphics/gstreamer/InbandTextTrackPrivateGStreamer.cpp

/*
 * Copyright (C) 2013 Cable Television Laboratories, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"

#if ENABLE(VIDEO) && USE(GSTREAMER)

#include "InbandTextTrackPrivateGStreamer.h"

#include <wtf/Lock.h>

GST_DEBUG_CATEGORY_EXTERN(webkit_media_player_debug);
#define GST_CAT_DEFAULT webkit_media_player_debug

namespace WebCore {

InbandTextTrackPrivateGStreamer::InbandTextTrackPrivateGStreamer(unsigned index, GRefPtr<GstPad>&& pad, bool shouldHandleStreamStartEvent)
    : InbandTextTrackPrivate(CueFormat::WebVTT)
    , TrackPrivateBaseGStreamer(TrackPrivateBaseGStreamer::TrackType::Text, this, index, WTFMove(pad), shouldHandleStreamStartEvent)
    , m_kind(Kind::Subtitles)
{
}

InbandTextTrackPrivateGStreamer::InbandTextTrackPrivateGStreamer(unsigned index, GstStream* stream)
    : InbandTextTrackPrivate(CueFormat::WebVTT)
    , TrackPrivateBaseGStreamer(TrackPrivateBaseGStreamer::TrackType::Text, this, index, stream)
{
    m_id = AtomString::fromLatin1(gst_stream_get_stream_id(m_stream));
    GST_INFO("Track %d got stream start for stream %s.", m_index, m_id.string().utf8().data());

    GST_DEBUG("Stream %" GST_PTR_FORMAT, m_stream);
    auto caps = adoptGRef(gst_stream_get_caps(m_stream));
    const char* mediaType = capsMediaType(caps.get());
    m_kind = g_str_has_prefix(mediaType, "closedcaption/") ? Kind::Captions : Kind::Subtitles;
}

void InbandTextTrackPrivateGStreamer::handleSample(GRefPtr<GstSample> sample)
{
    {
        Locker locker { m_sampleMutex };
        m_pendingSamples.append(sample);
    }

    RefPtr<InbandTextTrackPrivateGStreamer> protectedThis(this);
    m_notifier->notify(MainThreadNotification::NewSample, [protectedThis] {
        protectedThis->notifyTrackOfSample();
    });
}

void InbandTextTrackPrivateGStreamer::notifyTrackOfSample()
{
    Vector<GRefPtr<GstSample> > samples;
    {
        Locker locker { m_sampleMutex };
        m_pendingSamples.swap(samples);
    }

    for (size_t i = 0; i < samples.size(); ++i) {
        GRefPtr<GstSample> sample = samples[i];
        GstBuffer* buffer = gst_sample_get_buffer(sample.get());
        if (!buffer) {
            GST_WARNING("Track %d got sample with no buffer.", m_index);
            continue;
        }
        GstMappedBuffer mappedBuffer(buffer, GST_MAP_READ);
        ASSERT(mappedBuffer);
        if (!mappedBuffer) {
            GST_WARNING("Track %d unable to map buffer.", m_index);
            continue;
        }

        GST_INFO("Track %d parsing sample: %.*s", m_index, static_cast<int>(mappedBuffer.size()),
            reinterpret_cast<char*>(mappedBuffer.data()));
        client()->parseWebVTTCueData(mappedBuffer.data(), mappedBuffer.size());
    }
}

} // namespace WebCore

#endif // ENABLE(VIDEO) && USE(GSTREAMER)