2 Copyright (c) 2007, John Hurst
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions
8 1. Redistributions of source code must retain the above copyright
9 notice, this list of conditions and the following disclaimer.
10 2. Redistributions in binary form must reproduce the above copyright
11 notice, this list of conditions and the following disclaimer in the
12 documentation and/or other materials provided with the distribution.
13 3. The name of the author may not be used to endorse or promote products
14 derived from this software without specific prior written permission.
16 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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18 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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21 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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25 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 /*! \file AS_DCP_TimedText.cpp
29 \brief AS-DCP library, PCM essence reader and writer implementation
33 #include "AS_DCP_internal.h"
34 #include "S12MTimecode.h"
38 using namespace ASDCP;
40 const char* c_dcst_namespace_name = "http://www.smpte-ra.org/schemas/428-7/2007/DCST";
42 //------------------------------------------------------------------------------------------
46 class FilenameResolver : public ASDCP::TimedText::IResourceResolver
48 std::string m_Dirname;
51 bool operator==(const FilenameResolver&);
54 FilenameResolver(const std::string& dirname)
56 if ( PathIsDirectory(dirname) )
62 DefaultLogSink().Error("Path '%s' is not a directory, defaulting to '.'\n", dirname.c_str());
67 Result_t ResolveRID(const byte_t* uuid, TimedText::FrameBuffer& FrameBuf) const
72 std::string filename = m_Dirname + "/" + RID.EncodeHex(buf, 64);
73 DefaultLogSink().Debug("retrieving resource %s from file %s\n", buf, filename.c_str());
75 Result_t result = Reader.OpenRead(filename.c_str());
77 if ( KM_SUCCESS(result) )
79 ui32_t read_count = 0;
80 result = Reader.Read(FrameBuf.Data(), FrameBuf.Capacity(), &read_count);
82 if ( KM_SUCCESS(result) )
83 FrameBuf.Size(read_count);
90 //------------------------------------------------------------------------------------------
92 typedef std::map<Kumu::UUID, TimedText::MIMEType_t> ResourceTypeMap_t;
94 class ASDCP::TimedText::DCSubtitleParser::h__SubtitleParser
97 ResourceTypeMap_t m_ResourceTypes;
99 ASDCP_NO_COPY_CONSTRUCT(h__SubtitleParser);
102 std::string m_Filename;
103 std::string m_XMLDoc;
104 TimedTextDescriptor m_TDesc;
105 mem_ptr<FilenameResolver> m_DefaultResolver;
107 h__SubtitleParser() : m_Root("**ParserRoot**")
109 memset(&m_TDesc.AssetID, 0, UUIDlen);
112 ~h__SubtitleParser() {}
114 TimedText::IResourceResolver* GetDefaultResolver()
116 if ( m_DefaultResolver.empty() )
117 m_DefaultResolver = new FilenameResolver(PathDirname(m_Filename));
119 return m_DefaultResolver;
122 Result_t OpenRead(const char* filename);
123 Result_t ReadAncillaryResource(const byte_t* uuid, FrameBuffer& FrameBuf, const IResourceResolver& Resolver) const;
128 get_UUID_from_element(XMLElement* Element, UUID& ID)
131 const char* p = Element->GetBody().c_str();
132 if ( strncmp(p, "urn:uuid:", 9) == 0 ) p += 9;
133 return ID.DecodeHex(p);
138 get_UUID_from_child_element(const char* name, XMLElement* Parent, UUID& outID)
140 assert(name); assert(Parent);
141 XMLElement* Child = Parent->GetChildWithName(name);
142 if ( Child == 0 ) return false;
143 return get_UUID_from_element(Child, outID);
147 static ASDCP::Rational
148 decode_rational(const char* str_rat)
151 ui32_t Num = atoi(str_rat);
154 const char* den_str = strrchr(str_rat, ' ');
156 Den = atoi(den_str+1);
158 return ASDCP::Rational(Num, Den);
163 ASDCP::TimedText::DCSubtitleParser::h__SubtitleParser::OpenRead(const char* filename)
165 Result_t result = ReadFileIntoString(filename, m_XMLDoc);
167 if ( ! m_Root.ParseString(m_XMLDoc.c_str()) )
168 return RESULT_FORMAT;
170 m_Filename = filename;
171 m_TDesc.EncodingName = "UTF-8"; // the XML parser demands UTF-8
172 m_TDesc.ResourceList.clear();
173 m_TDesc.ContainerDuration = 0;
174 const XMLNamespace* ns = m_Root.Namespace();
178 DefaultLogSink(). Warn("Document has no namespace name, assuming %s\n", c_dcst_namespace_name);
179 m_TDesc.NamespaceName = c_dcst_namespace_name;
182 m_TDesc.NamespaceName = ns->Name();
185 if ( ! get_UUID_from_child_element("Id", &m_Root, DocID) )
187 DefaultLogSink(). Error("Id element missing from input document\n");
188 return RESULT_FORMAT;
191 memcpy(m_TDesc.AssetID, DocID.Value(), DocID.Size());
192 XMLElement* EditRate = m_Root.GetChildWithName("EditRate");
196 DefaultLogSink(). Error("EditRate element missing from input document\n");
197 return RESULT_FORMAT;
200 m_TDesc.EditRate = decode_rational(EditRate->GetBody().c_str());
202 if ( m_TDesc.EditRate != EditRate_24 && m_TDesc.EditRate != EditRate_48 )
204 DefaultLogSink(). Error("EditRate must be 24/1 or 48/1\n");
205 return RESULT_FORMAT;
209 ElementList FontList;
210 m_Root.GetChildrenWithName("LoadFont", FontList);
212 for ( Elem_i i = FontList.begin(); i != FontList.end(); i++ )
215 if ( ! get_UUID_from_element(*i, AssetID) )
217 DefaultLogSink(). Error("LoadFont element does not contain a urn:uuid value as expected.\n");
218 return RESULT_FORMAT;
221 TimedTextResourceDescriptor TmpResource;
222 memcpy(TmpResource.ResourceID, AssetID.Value(), UUIDlen);
223 TmpResource.Type = MT_OPENTYPE;
224 m_TDesc.ResourceList.push_back(TmpResource);
225 m_ResourceTypes.insert(ResourceTypeMap_t::value_type(UUID(TmpResource.ResourceID), MT_OPENTYPE));
229 ElementList ImageList;
230 m_Root.GetChildrenWithName("Image", ImageList);
232 for ( Elem_i i = ImageList.begin(); i != ImageList.end(); i++ )
235 if ( ! get_UUID_from_element(*i, AssetID) )
237 DefaultLogSink(). Error("Image element does not contain a urn:uuid value as expected.\n");
238 return RESULT_FORMAT;
241 TimedTextResourceDescriptor TmpResource;
242 memcpy(TmpResource.ResourceID, AssetID.Value(), UUIDlen);
243 TmpResource.Type = MT_PNG;
244 m_TDesc.ResourceList.push_back(TmpResource);
245 m_ResourceTypes.insert(ResourceTypeMap_t::value_type(UUID(TmpResource.ResourceID), MT_PNG));
248 // Calculate the timeline duration.
249 // This is a little ugly because the last element in the file is not necessarily
250 // the last instance to be displayed, e.g., element n and element n-1 may have the
251 // same start time but n-1 may have a greater duration making it the last to be seen.
252 // We must scan the list to accumulate the latest TimeOut value.
253 ElementList InstanceList;
254 ElementList::const_iterator ei;
255 ui32_t end_count = 0;
257 m_Root.GetChildrenWithName("Subtitle", InstanceList);
259 if ( InstanceList.empty() )
261 DefaultLogSink(). Error("XML document contains no Subtitle elements!\n");
262 return RESULT_FORMAT;
265 // assumes 24/1 or 48/1 as constrained above
266 S12MTimecode beginTC(InstanceList.front()->GetAttrWithName("TimeIn"), m_TDesc.EditRate.Numerator);
268 for ( ei = InstanceList.begin(); ei != InstanceList.end(); ei++ )
270 S12MTimecode tmpTC((*ei)->GetAttrWithName("TimeOut"), m_TDesc.EditRate.Numerator);
271 if ( end_count < tmpTC.GetFrames() )
272 end_count = tmpTC.GetFrames();
275 assert( end_count > beginTC.GetFrames() );
276 m_TDesc.ContainerDuration = end_count - beginTC.GetFrames();
284 ASDCP::TimedText::DCSubtitleParser::h__SubtitleParser::ReadAncillaryResource(const byte_t* uuid, FrameBuffer& FrameBuf,
285 const IResourceResolver& Resolver) const
287 FrameBuf.AssetID(uuid);
291 ResourceTypeMap_t::const_iterator rmi = m_ResourceTypes.find(TmpID);
293 if ( rmi == m_ResourceTypes.end() )
295 DefaultLogSink().Error("Unknown ancillary resource id: %s\n", TmpID.EncodeHex(buf, 64));
299 Result_t result = Resolver.ResolveRID(uuid, FrameBuf);
301 if ( KM_SUCCESS(result) )
303 if ( (*rmi).second == MT_PNG )
304 FrameBuf.MIMEType("image/png");
306 else if ( (*rmi).second == MT_OPENTYPE )
307 FrameBuf.MIMEType("application/x-opentype");
310 FrameBuf.MIMEType("application/octet-stream");
316 //------------------------------------------------------------------------------------------
318 ASDCP::TimedText::DCSubtitleParser::DCSubtitleParser()
322 ASDCP::TimedText::DCSubtitleParser::~DCSubtitleParser()
326 // Opens the stream for reading, parses enough data to provide a complete
327 // set of stream metadata for the MXFWriter below.
329 ASDCP::TimedText::DCSubtitleParser::OpenRead(const char* filename) const
331 const_cast<ASDCP::TimedText::DCSubtitleParser*>(this)->m_Parser = new h__SubtitleParser;
333 Result_t result = m_Parser->OpenRead(filename);
335 if ( ASDCP_FAILURE(result) )
336 const_cast<ASDCP::TimedText::DCSubtitleParser*>(this)->m_Parser = 0;
343 ASDCP::TimedText::DCSubtitleParser::FillDescriptor(TimedTextDescriptor& TDesc) const
345 if ( m_Parser.empty() )
348 TDesc = m_Parser->m_TDesc;
352 // Reads the complete Timed Text Resource into the given string.
354 ASDCP::TimedText::DCSubtitleParser::ReadTimedTextResource(std::string& s) const
356 if ( m_Parser.empty() )
359 s = m_Parser->m_XMLDoc;
365 ASDCP::TimedText::DCSubtitleParser::ReadAncillaryResource(const byte_t* uuid, FrameBuffer& FrameBuf,
366 const IResourceResolver* Resolver) const
368 if ( m_Parser.empty() )
372 Resolver = m_Parser->GetDefaultResolver();
374 return m_Parser->ReadAncillaryResource(uuid, FrameBuf, *Resolver);
379 // end AS_DCP_timedText.cpp