1 /*
2 * Copyright 2012, The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 //#define LOG_NDEBUG 0
18 #define LOG_TAG "MediaCodecListWriter"
19 #include <utils/Log.h>
20
21 #include <media/stagefright/foundation/AMessage.h>
22 #include "media/stagefright/foundation/AString.h"
23 #include <media/stagefright/MediaCodecListWriter.h>
24 #include <media/MediaCodecInfo.h>
25
26 #include <string>
27
28 namespace android {
29
addGlobalSetting(const char * key,const char * value)30 void MediaCodecListWriter::addGlobalSetting(
31 const char* key, const char* value) {
32 mGlobalSettings.emplace_back(key, value);
33 }
34
35 std::unique_ptr<MediaCodecInfoWriter>
addMediaCodecInfo()36 MediaCodecListWriter::addMediaCodecInfo() {
37 sp<MediaCodecInfo> info = new MediaCodecInfo();
38 mCodecInfos.push_back(info);
39 return std::unique_ptr<MediaCodecInfoWriter>(
40 new MediaCodecInfoWriter(info.get()));
41 }
42
43 std::unique_ptr<MediaCodecInfoWriter>
findMediaCodecInfo(const char * name)44 MediaCodecListWriter::findMediaCodecInfo(const char *name) {
45 for (const sp<MediaCodecInfo> &info : mCodecInfos) {
46 if (!strcmp(info->getCodecName(), name)) {
47 return std::unique_ptr<MediaCodecInfoWriter>(new MediaCodecInfoWriter(info.get()));
48 }
49 }
50 return nullptr;
51 }
52
writeGlobalSettings(const sp<AMessage> & globalSettings) const53 void MediaCodecListWriter::writeGlobalSettings(
54 const sp<AMessage> &globalSettings) const {
55 for (const std::pair<std::string, std::string> &kv : mGlobalSettings) {
56 globalSettings->setString(kv.first.c_str(), kv.second.c_str());
57 }
58 }
59
writeCodecInfos(std::vector<sp<MediaCodecInfo>> * codecInfos) const60 void MediaCodecListWriter::writeCodecInfos(
61 std::vector<sp<MediaCodecInfo>> *codecInfos) const {
62 // Since the introduction of the NDK MediaCodecList API, each
63 // MediaCodecInfo object can only support a single media type, so infos that
64 // support multiple media types are split into multiple infos.
65 // This process may result in name collisions that are handled here.
66
67 // Prefer codec names that already support a single media type
68 // and also any existing aliases. If an alias matches an existing
69 // codec name, it is ignored, which is the right behavior.
70 std::set<std::string> reservedNames;
71 for (const sp<MediaCodecInfo> &info : mCodecInfos) {
72 Vector<AString> mediaTypes;
73 info->getSupportedMediaTypes(&mediaTypes);
74 if (mediaTypes.size() == 1) {
75 reservedNames.insert(info->getCodecName());
76 }
77 Vector<AString> aliases;
78 info->getAliases(&aliases);
79 for (const AString &alias : aliases) {
80 reservedNames.insert(alias.c_str());
81 }
82 }
83
84 for (const sp<MediaCodecInfo> &info : mCodecInfos) {
85 Vector<AString> mediaTypes;
86 info->getSupportedMediaTypes(&mediaTypes);
87 if (mediaTypes.size() == 1) {
88 codecInfos->push_back(info);
89 } else {
90 // disambiguate each type
91 for (const AString &mediaType : mediaTypes) {
92 // get the type name after the first slash (if exists)
93 ssize_t slashPosition = mediaType.find("/");
94 const char *typeName = mediaType.c_str() + (slashPosition + 1);
95
96 // find a unique name for the split codec info starting with "<name>.<type>"
97 AString newName = AStringPrintf("%s.%s", info->getCodecName(), typeName);
98 std::string newNameStr = newName.c_str();
99 // append increasing suffix of the form ".<number>" until a unique name is found
100 for (size_t ix = 1; reservedNames.count(newNameStr) > 0; ++ix) {
101 newNameStr = AStringPrintf("%s.%zu", newName.c_str(), ix).c_str();
102 }
103
104 codecInfos->push_back(info->splitOutType(mediaType.c_str(), newNameStr.c_str()));
105 reservedNames.insert(newNameStr);
106 }
107 }
108 }
109 }
110
111 } // namespace android
112