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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "modules/mediasource/MediaSource.h"
     33 
     34 #include "bindings/v8/ExceptionState.h"
     35 #include "bindings/v8/ExceptionStatePlaceholder.h"
     36 #include "core/dom/ExceptionCode.h"
     37 #include "core/dom/GenericEventQueue.h"
     38 #include "core/html/TimeRanges.h"
     39 #include "core/platform/ContentType.h"
     40 #include "core/platform/Logging.h"
     41 #include "core/platform/MIMETypeRegistry.h"
     42 #include "core/platform/graphics/SourceBufferPrivate.h"
     43 #include "modules/mediasource/MediaSourceRegistry.h"
     44 #include "wtf/Uint8Array.h"
     45 #include "wtf/text/CString.h"
     46 
     47 namespace WebCore {
     48 
     49 PassRefPtr<MediaSource> MediaSource::create(ScriptExecutionContext* context)
     50 {
     51     RefPtr<MediaSource> mediaSource(adoptRef(new MediaSource(context)));
     52     mediaSource->suspendIfNeeded();
     53     return mediaSource.release();
     54 }
     55 
     56 MediaSource::MediaSource(ScriptExecutionContext* context)
     57     : MediaSourceBase(context)
     58 {
     59     LOG(Media, "MediaSource::MediaSource %p", this);
     60     ScriptWrappable::init(this);
     61     m_sourceBuffers = SourceBufferList::create(scriptExecutionContext(), asyncEventQueue());
     62     m_activeSourceBuffers = SourceBufferList::create(scriptExecutionContext(), asyncEventQueue());
     63 }
     64 
     65 MediaSource::~MediaSource()
     66 {
     67     LOG(Media, "MediaSource::~MediaSource %p", this);
     68     ASSERT(isClosed());
     69 }
     70 
     71 SourceBuffer* MediaSource::addSourceBuffer(const String& type, ExceptionState& es)
     72 {
     73     LOG(Media, "MediaSource::addSourceBuffer(%s) %p", type.ascii().data(), this);
     74 
     75     // 2.2 https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html#widl-MediaSource-addSourceBuffer-SourceBuffer-DOMString-type
     76     // 1. If type is null or an empty then throw an InvalidAccessError exception and
     77     // abort these steps.
     78     if (type.isNull() || type.isEmpty()) {
     79         es.throwDOMException(InvalidAccessError);
     80         return 0;
     81     }
     82 
     83     // 2. If type contains a MIME type that is not supported ..., then throw a
     84     // NotSupportedError exception and abort these steps.
     85     if (!isTypeSupported(type)) {
     86         es.throwDOMException(NotSupportedError);
     87         return 0;
     88     }
     89 
     90     // 4. If the readyState attribute is not in the "open" state then throw an
     91     // InvalidStateError exception and abort these steps.
     92     if (!isOpen()) {
     93         es.throwDOMException(InvalidStateError);
     94         return 0;
     95     }
     96 
     97     // 5. Create a new SourceBuffer object and associated resources.
     98     ContentType contentType(type);
     99     Vector<String> codecs = contentType.codecs();
    100     OwnPtr<SourceBufferPrivate> sourceBufferPrivate = createSourceBufferPrivate(contentType.type(), codecs, es);
    101 
    102     if (!sourceBufferPrivate) {
    103         ASSERT(es.code() == NotSupportedError || es.code() == QuotaExceededError);
    104         // 2. If type contains a MIME type that is not supported ..., then throw a NotSupportedError exception and abort these steps.
    105         // 3. If the user agent can't handle any more SourceBuffer objects then throw a QuotaExceededError exception and abort these steps
    106         return 0;
    107     }
    108 
    109     RefPtr<SourceBuffer> buffer = SourceBuffer::create(sourceBufferPrivate.release(), this, asyncEventQueue());
    110     // 6. Add the new object to sourceBuffers and fire a addsourcebuffer on that object.
    111     m_sourceBuffers->add(buffer);
    112     m_activeSourceBuffers->add(buffer);
    113     // 7. Return the new object to the caller.
    114     return buffer.get();
    115 }
    116 
    117 void MediaSource::removeSourceBuffer(SourceBuffer* buffer, ExceptionState& es)
    118 {
    119     LOG(Media, "MediaSource::removeSourceBuffer() %p", this);
    120     RefPtr<SourceBuffer> protect(buffer);
    121 
    122     // 2.2 https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-source.html#widl-MediaSource-removeSourceBuffer-void-SourceBuffer-sourceBuffer
    123     // 1. If sourceBuffer is null then throw an InvalidAccessError exception and
    124     // abort these steps.
    125     if (!buffer) {
    126         es.throwDOMException(InvalidAccessError);
    127         return;
    128     }
    129 
    130     // 2. If sourceBuffer specifies an object that is not in sourceBuffers then
    131     // throw a NotFoundError exception and abort these steps.
    132     if (!m_sourceBuffers->length() || !m_sourceBuffers->contains(buffer)) {
    133         es.throwDOMException(NotFoundError);
    134         return;
    135     }
    136 
    137     // 3. If the sourceBuffer.updating attribute equals true, then run the following steps: ...
    138     buffer->abortIfUpdating();
    139 
    140     // Steps 4-9 are related to updating audioTracks, videoTracks, and textTracks which aren't implmented yet.
    141     // FIXME(91649): support track selection
    142 
    143     // 10. If sourceBuffer is in activeSourceBuffers, then remove sourceBuffer from activeSourceBuffers ...
    144     m_activeSourceBuffers->remove(buffer);
    145 
    146     // 11. Remove sourceBuffer from sourceBuffers and fire a removesourcebuffer event
    147     // on that object.
    148     m_sourceBuffers->remove(buffer);
    149 
    150     // 12. Destroy all resources for sourceBuffer.
    151     buffer->removedFromMediaSource();
    152 }
    153 
    154 void MediaSource::onReadyStateChange(const AtomicString& oldState, const AtomicString& newState)
    155 {
    156     if (isOpen()) {
    157         scheduleEvent(eventNames().sourceopenEvent);
    158         return;
    159     }
    160 
    161     if (oldState == openKeyword() && newState == endedKeyword()) {
    162         scheduleEvent(eventNames().sourceendedEvent);
    163         return;
    164     }
    165 
    166     ASSERT(isClosed());
    167 
    168     m_activeSourceBuffers->clear();
    169 
    170     // Clear SourceBuffer references to this object.
    171     for (unsigned long i = 0; i < m_sourceBuffers->length(); ++i)
    172         m_sourceBuffers->item(i)->removedFromMediaSource();
    173     m_sourceBuffers->clear();
    174 
    175     scheduleEvent(eventNames().sourcecloseEvent);
    176 }
    177 
    178 Vector<RefPtr<TimeRanges> > MediaSource::activeRanges() const
    179 {
    180     Vector<RefPtr<TimeRanges> > activeRanges(m_activeSourceBuffers->length());
    181     for (size_t i = 0; i < m_activeSourceBuffers->length(); ++i)
    182         activeRanges[i] = m_activeSourceBuffers->item(i)->buffered(ASSERT_NO_EXCEPTION);
    183 
    184     return activeRanges;
    185 }
    186 
    187 bool MediaSource::isTypeSupported(const String& type)
    188 {
    189     LOG(Media, "MediaSource::isTypeSupported(%s)", type.ascii().data());
    190 
    191     // Section 2.2 isTypeSupported() method steps.
    192     // https://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#widl-MediaSource-isTypeSupported-boolean-DOMString-type
    193     // 1. If type is an empty string, then return false.
    194     if (type.isNull() || type.isEmpty())
    195         return false;
    196 
    197     ContentType contentType(type);
    198     String codecs = contentType.parameter("codecs");
    199 
    200     // 2. If type does not contain a valid MIME type string, then return false.
    201     if (contentType.type().isEmpty() || codecs.isEmpty())
    202         return false;
    203 
    204     // 3. If type contains a media type or media subtype that the MediaSource does not support, then return false.
    205     // 4. If type contains at a codec that the MediaSource does not support, then return false.
    206     // 5. If the MediaSource does not support the specified combination of media type, media subtype, and codecs then return false.
    207     // 6. Return true.
    208     return MIMETypeRegistry::isSupportedMediaSourceMIMEType(contentType.type(), codecs);
    209 }
    210 
    211 const AtomicString& MediaSource::interfaceName() const
    212 {
    213     return eventNames().interfaceForMediaSource;
    214 }
    215 
    216 } // namespace WebCore
    217