Add Chromium-side changes for MediaSource::isTypeSupported()

media/filters/stream_parser_factory.cc

Index: media/filters/stream_parser_factory.cc
diff --git a/media/filters/stream_parser_factory.cc b/media/filters/stream_parser_factory.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0cd8b9a0b435ba1fecc4ddb07cc2d8ee848ea2cc
--- /dev/null
+++ b/media/filters/stream_parser_factory.cc
@@ -0,0 +1,256 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "media/filters/stream_parser_factory.h"
+
+#include "base/string_number_conversions.h"
+#include "base/string_util.h"
+#include "media/base/media_log.h"
+#include "media/webm/webm_stream_parser.h"
+
+#if defined(GOOGLE_CHROME_BUILD) || defined(USE_PROPRIETARY_CODECS)
+#include "media/mp4/es_descriptor.h"
+#include "media/mp4/mp4_stream_parser.h"
+#endif
+
+namespace media {
+
+typedef bool (*CodecIDValidatorFunction)(
+    const std::string& codecs_id, const media::LogCB& log_cb);
+
+struct CodecInfo {
+  enum Type {
+    UNKNOWN,
+    AUDIO,
+    VIDEO
+  };
+
+  const char* pattern;
+  Type type;
+  CodecIDValidatorFunction validator;
+};
+
+typedef media::StreamParser* (*ParserFactoryFunction)(
+    const std::vector<std::string>& codecs,
+    const media::LogCB& log_cb);
+
+struct SupportedTypeInfo {
+  const char* type;
+  const ParserFactoryFunction factory_function;
+  const CodecInfo** codecs;
+};
+
+static const CodecInfo kVP8CodecInfo = { "vp8", CodecInfo::VIDEO, NULL };
+static const CodecInfo kVorbisCodecInfo = { "vorbis", CodecInfo::AUDIO, NULL };
+
+static const CodecInfo* kVideoWebMCodecs[] = {
+  &kVP8CodecInfo,
+  &kVorbisCodecInfo,
+  NULL
+};
+
+static const CodecInfo* kAudioWebMCodecs[] = {
+  &kVorbisCodecInfo,
+  NULL
+};
+
+static media::StreamParser* BuildWebMParser(
+    const std::vector<std::string>& codecs,
+    const media::LogCB& log_cb) {
+#if defined(OS_ANDROID)
+  return NULL;
+#else
+  return new media::WebMStreamParser();
+#endif
+}
+
+#if defined(GOOGLE_CHROME_BUILD) || defined(USE_PROPRIETARY_CODECS)
+// AAC Object Type IDs that Chrome supports.
+static const int kAACLCObjectType = 2;
+static const int kAACSBRObjectType = 5;
+
+static int GetMP4AudioObjectType(const std::string& codec_id,
+                                 const media::LogCB& log_cb) {
+  int audio_object_type;
+  std::vector<std::string> tokens;
+  if (Tokenize(codec_id, ".", &tokens) != 3 ||
+      tokens[0] != "mp4a" || tokens[1] != "40" ||
+      !base::HexStringToInt(tokens[2], &audio_object_type)) {
+    MEDIA_LOG(log_cb) << "Malformed mimetype codec '" << codec_id << "'";
+    return -1;
+  }
+
+
+  return audio_object_type;
+}
+
+bool ValidateMP4ACodecID(const std::string& codec_id,
+                         const media::LogCB& log_cb) {
+  int audio_object_type = GetMP4AudioObjectType(codec_id, log_cb);
+  if (audio_object_type == kAACLCObjectType ||
+      audio_object_type == kAACSBRObjectType) {
+    return true;
+  }
+
+  MEDIA_LOG(log_cb) << "Unsupported audio object type "
+                    << "0x" << std::hex << audio_object_type
+                    << " in codec '" << codec_id << "'";
+  return false;
+}
+
+static const CodecInfo kH264CodecInfo = { "avc1.*", CodecInfo::VIDEO, NULL };
+static const CodecInfo kMPEG4AACCodecInfo = {
+  "mp4a.40.*", CodecInfo::AUDIO, &ValidateMP4ACodecID
+};
+
+static const CodecInfo kMPEG2AACLCCodecInfo = {
+  "mp4a.67", CodecInfo::AUDIO, NULL
+};
+
+static const CodecInfo* kVideoMP4Codecs[] = {
+  &kH264CodecInfo,
+  &kMPEG4AACCodecInfo,
+  &kMPEG2AACLCCodecInfo,
+  NULL
+};
+
+static const CodecInfo* kAudioMP4Codecs[] = {
+  &kMPEG4AACCodecInfo,
+  &kMPEG2AACLCCodecInfo,
+  NULL
+};
+
+static media::StreamParser* BuildMP4Parser(
+    const std::vector<std::string>& codecs, const media::LogCB& log_cb) {
+#if defined(OS_ANDROID)
+  return NULL;
+#else
+  std::set<int> audio_object_types;
+  bool has_sbr = false;
+  for (size_t i = 0; i < codecs.size(); ++i) {
+    std::string codec_id = codecs[i];
+    if (MatchPattern(codec_id, kMPEG2AACLCCodecInfo.pattern)) {
+      audio_object_types.insert(media::mp4::kISO_13818_7_AAC_LC);
+    } else if (MatchPattern(codec_id, kMPEG4AACCodecInfo.pattern)) {
+      int audio_object_type = GetMP4AudioObjectType(codec_id, log_cb);
+      DCHECK_GT(audio_object_type, 0);
+
+      audio_object_types.insert(media::mp4::kISO_14496_3);
+
+      if (audio_object_type == kAACSBRObjectType) {
+        has_sbr = true;
+        break;
+      }
+    }
+  }
+
+  return new media::mp4::MP4StreamParser(audio_object_types, has_sbr);
+#endif
+}
+#endif
+
+static const SupportedTypeInfo kSupportedTypeInfo[] = {
+  { "video/webm", &BuildWebMParser, kVideoWebMCodecs },
+  { "audio/webm", &BuildWebMParser, kAudioWebMCodecs },
+#if defined(GOOGLE_CHROME_BUILD) || defined(USE_PROPRIETARY_CODECS)
+  { "video/mp4", &BuildMP4Parser, kVideoMP4Codecs },
+  { "audio/mp4", &BuildMP4Parser, kAudioMP4Codecs },
+#endif
+};
+
+// Checks to see if the specified |type| and |codecs| list are supported.
+// Returns true if |type| and all codecs listed in |codecs| are supported.
+//         |factory_function| contains a function that can build a StreamParser
+//                            for this type.
+//         |has_audio| is true if an audio codec was specified.
+//         |has_video| is true if a video codec was specified.
+// Returns false otherwise. The values of |factory_function|, |has_audio|,
+//         and |has_video| are undefined.
+static bool IsSupported(const std::string& type,
+                        const std::vector<std::string>& codecs,
+                        const media::LogCB& log_cb,
+                        ParserFactoryFunction* factory_function,
+                        bool* has_audio,
+                        bool* has_video) {
+  DCHECK_GT(codecs.size(), 0u);
+  *factory_function = NULL;
+  *has_audio = false;
+  *has_video = false;
+
+  // Search for the SupportedTypeInfo for |type|.
+  for (size_t i = 0; i < arraysize(kSupportedTypeInfo); ++i) {
+    const SupportedTypeInfo& type_info = kSupportedTypeInfo[i];
+    if (type == type_info.type) {
+      // Make sure all the codecs specified in |codecs| are
+      // in the supported type info.
+      for (size_t j = 0; j < codecs.size(); ++j) {
+        // Search the type info for a match.
+        bool found_codec = false;
+        CodecInfo::Type codec_type = CodecInfo::UNKNOWN;
+        std::string codec_id = codecs[j];
+        for (int k = 0; type_info.codecs[k]; ++k) {
+          if (MatchPattern(codec_id, type_info.codecs[k]->pattern) &&
+              (!type_info.codecs[k]->validator ||
+               type_info.codecs[k]->validator(codec_id, log_cb))) {
+            found_codec = true;
+            codec_type = type_info.codecs[k]->type;
+            break;
+          }
+        }
+
+        if (!found_codec) {
+          MEDIA_LOG(log_cb) << "Codec '" << codec_id
+                            <<"' is not supported for '" << type << "'";
+          return false;
+        }
+
+        switch (codec_type) {
+          case CodecInfo::AUDIO:
+            *has_audio = true;
+            break;
+          case CodecInfo::VIDEO:
+            *has_video = true;
+            break;
+          default:
+            MEDIA_LOG(log_cb) << "Unsupported codec type '"<< codec_type
+                              << "' for " << codec_id;
+            return false;
+        }
+      }
+
+      *factory_function = type_info.factory_function;
+
+      // All codecs were supported by this |type|.
+      return true;
+    }
+  }
+
+  // |type| didn't match any of the supported types.
+  return false;
+}
+
+bool StreamParserFactory::IsTypeSupported(
+    const std::string& type, const std::vector<std::string>& codecs) {
+  bool has_audio;
+  bool has_video;
+  ParserFactoryFunction factory_function;
+  return IsSupported(type, codecs, media::LogCB(), &factory_function,
+                     &has_audio, &has_video);
+}
+
+scoped_ptr<media::StreamParser> StreamParserFactory::Create(
+    const std::string& type, const std::vector<std::string>& codecs,
+      const media::LogCB& log_cb, bool* has_audio, bool* has_video) {
+  scoped_ptr<media::StreamParser> stream_parser;
+  ParserFactoryFunction factory_function;
+  if (IsSupported(type, codecs, log_cb, &factory_function,
+                  has_audio, has_video)) {
+    stream_parser.reset(factory_function(codecs, log_cb));
+  }
+
+  return stream_parser.Pass();
+}
+
+
+}  // namespace media