Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 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 | #include "ASessionDescription.h" |
| 18 | |
| 19 | #include <media/stagefright/foundation/ADebug.h> |
| 20 | #include <media/stagefright/foundation/AString.h> |
| 21 | |
| 22 | #include <stdlib.h> |
| 23 | |
| 24 | namespace android { |
| 25 | |
| 26 | ASessionDescription::ASessionDescription() |
| 27 | : mIsValid(false) { |
| 28 | } |
| 29 | |
| 30 | ASessionDescription::~ASessionDescription() { |
| 31 | } |
| 32 | |
| 33 | bool ASessionDescription::setTo(const void *data, size_t size) { |
| 34 | mIsValid = parse(data, size); |
| 35 | |
| 36 | if (!mIsValid) { |
| 37 | mTracks.clear(); |
| 38 | mFormats.clear(); |
| 39 | } |
| 40 | |
| 41 | return mIsValid; |
| 42 | } |
| 43 | |
| 44 | bool ASessionDescription::parse(const void *data, size_t size) { |
| 45 | mTracks.clear(); |
| 46 | mFormats.clear(); |
| 47 | |
| 48 | mTracks.push(Attribs()); |
| 49 | mFormats.push(AString("[root]")); |
| 50 | |
| 51 | AString desc((const char *)data, size); |
Andreas Huber | 57648e4 | 2010-08-04 10:14:30 -0700 | [diff] [blame] | 52 | LOG(INFO) << desc; |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 53 | |
| 54 | size_t i = 0; |
| 55 | for (;;) { |
| 56 | ssize_t eolPos = desc.find("\r\n", i); |
| 57 | if (eolPos < 0) { |
| 58 | break; |
| 59 | } |
| 60 | |
| 61 | AString line(desc, i, eolPos - i); |
| 62 | |
| 63 | if (line.size() < 2 || line.c_str()[1] != '=') { |
| 64 | return false; |
| 65 | } |
| 66 | |
| 67 | switch (line.c_str()[0]) { |
| 68 | case 'v': |
| 69 | { |
| 70 | if (strcmp(line.c_str(), "v=0")) { |
| 71 | return false; |
| 72 | } |
| 73 | break; |
| 74 | } |
| 75 | |
| 76 | case 'a': |
| 77 | case 'b': |
| 78 | { |
| 79 | AString key, value; |
| 80 | |
| 81 | ssize_t colonPos = line.find(":", 2); |
| 82 | if (colonPos < 0) { |
| 83 | key = line; |
| 84 | } else { |
| 85 | key.setTo(line, 0, colonPos); |
| 86 | |
| 87 | if (key == "a=fmtp" || key == "a=rtpmap" |
| 88 | || key == "a=framesize") { |
| 89 | ssize_t spacePos = line.find(" ", colonPos + 1); |
| 90 | if (spacePos < 0) { |
| 91 | return false; |
| 92 | } |
| 93 | |
| 94 | key.setTo(line, 0, spacePos); |
| 95 | |
| 96 | colonPos = spacePos; |
| 97 | } |
| 98 | |
| 99 | value.setTo(line, colonPos + 1, line.size() - colonPos - 1); |
| 100 | } |
| 101 | |
| 102 | key.trim(); |
| 103 | value.trim(); |
| 104 | |
| 105 | LOG(VERBOSE) << "adding '" << key << "' => '" << value << "'"; |
| 106 | |
| 107 | mTracks.editItemAt(mTracks.size() - 1).add(key, value); |
| 108 | break; |
| 109 | } |
| 110 | |
| 111 | case 'm': |
| 112 | { |
| 113 | LOG(VERBOSE) << "new section '" << AString(line, 2, line.size() - 2) << "'"; |
| 114 | |
| 115 | mTracks.push(Attribs()); |
| 116 | mFormats.push(AString(line, 2, line.size() - 2)); |
| 117 | break; |
| 118 | } |
Andreas Huber | 57648e4 | 2010-08-04 10:14:30 -0700 | [diff] [blame] | 119 | |
| 120 | default: |
| 121 | { |
| 122 | AString key, value; |
| 123 | |
| 124 | ssize_t equalPos = line.find("="); |
| 125 | |
| 126 | key = AString(line, 0, equalPos + 1); |
| 127 | value = AString(line, equalPos + 1, line.size() - equalPos - 1); |
| 128 | |
| 129 | key.trim(); |
| 130 | value.trim(); |
| 131 | |
| 132 | LOG(VERBOSE) << "adding '" << key << "' => '" << value << "'"; |
| 133 | |
| 134 | mTracks.editItemAt(mTracks.size() - 1).add(key, value); |
| 135 | break; |
| 136 | } |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | i = eolPos + 2; |
| 140 | } |
| 141 | |
| 142 | return true; |
| 143 | } |
| 144 | |
| 145 | bool ASessionDescription::isValid() const { |
| 146 | return mIsValid; |
| 147 | } |
| 148 | |
| 149 | size_t ASessionDescription::countTracks() const { |
| 150 | return mTracks.size(); |
| 151 | } |
| 152 | |
| 153 | void ASessionDescription::getFormat(size_t index, AString *value) const { |
| 154 | CHECK_GE(index, 0u); |
| 155 | CHECK_LT(index, mTracks.size()); |
| 156 | |
| 157 | *value = mFormats.itemAt(index); |
| 158 | } |
| 159 | |
| 160 | bool ASessionDescription::findAttribute( |
| 161 | size_t index, const char *key, AString *value) const { |
| 162 | CHECK_GE(index, 0u); |
| 163 | CHECK_LT(index, mTracks.size()); |
| 164 | |
| 165 | value->clear(); |
| 166 | |
| 167 | const Attribs &track = mTracks.itemAt(index); |
| 168 | ssize_t i = track.indexOfKey(AString(key)); |
| 169 | |
| 170 | if (i < 0) { |
| 171 | return false; |
| 172 | } |
| 173 | |
| 174 | *value = track.valueAt(i); |
| 175 | |
| 176 | return true; |
| 177 | } |
| 178 | |
| 179 | void ASessionDescription::getFormatType( |
| 180 | size_t index, unsigned long *PT, |
| 181 | AString *desc, AString *params) const { |
| 182 | AString format; |
| 183 | getFormat(index, &format); |
| 184 | |
| 185 | char *lastSpacePos = strrchr(format.c_str(), ' '); |
| 186 | CHECK(lastSpacePos != NULL); |
| 187 | |
| 188 | char *end; |
| 189 | unsigned long x = strtoul(lastSpacePos + 1, &end, 10); |
| 190 | CHECK_GT(end, lastSpacePos + 1); |
| 191 | CHECK_EQ(*end, '\0'); |
| 192 | |
| 193 | *PT = x; |
| 194 | |
| 195 | char key[20]; |
| 196 | sprintf(key, "a=rtpmap:%lu", x); |
| 197 | |
| 198 | CHECK(findAttribute(index, key, desc)); |
| 199 | |
| 200 | sprintf(key, "a=fmtp:%lu", x); |
| 201 | if (!findAttribute(index, key, params)) { |
| 202 | params->clear(); |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | void ASessionDescription::getDimensions( |
| 207 | size_t index, unsigned long PT, |
| 208 | int32_t *width, int32_t *height) const { |
| 209 | char key[20]; |
| 210 | sprintf(key, "a=framesize:%lu", PT); |
| 211 | AString value; |
| 212 | CHECK(findAttribute(index, key, &value)); |
| 213 | |
| 214 | const char *s = value.c_str(); |
| 215 | char *end; |
| 216 | *width = strtoul(s, &end, 10); |
| 217 | CHECK_GT(end, s); |
| 218 | CHECK_EQ(*end, '-'); |
| 219 | |
| 220 | s = end + 1; |
| 221 | *height = strtoul(s, &end, 10); |
| 222 | CHECK_GT(end, s); |
| 223 | CHECK_EQ(*end, '\0'); |
| 224 | } |
| 225 | |
| 226 | bool ASessionDescription::getDurationUs(int64_t *durationUs) const { |
| 227 | *durationUs = 0; |
| 228 | |
| 229 | CHECK(mIsValid); |
| 230 | |
| 231 | AString value; |
| 232 | if (!findAttribute(0, "a=range", &value)) { |
| 233 | return false; |
| 234 | } |
| 235 | |
| 236 | if (value == "npt=now-") { |
| 237 | return false; |
| 238 | } |
| 239 | |
| 240 | if (strncmp(value.c_str(), "npt=", 4)) { |
| 241 | return false; |
| 242 | } |
| 243 | |
| 244 | const char *s = value.c_str() + 4; |
| 245 | char *end; |
| 246 | double from = strtod(s, &end); |
| 247 | CHECK_GT(end, s); |
| 248 | CHECK_EQ(*end, '-'); |
| 249 | |
| 250 | s = end + 1; |
| 251 | double to = strtod(s, &end); |
| 252 | CHECK_GT(end, s); |
| 253 | CHECK_EQ(*end, '\0'); |
| 254 | |
| 255 | CHECK_GE(to, from); |
| 256 | |
| 257 | *durationUs = (int64_t)((to - from) * 1E6); |
| 258 | |
| 259 | return true; |
| 260 | } |
| 261 | |
| 262 | // static |
| 263 | void ASessionDescription::ParseFormatDesc( |
| 264 | const char *desc, int32_t *timescale, int32_t *numChannels) { |
| 265 | const char *slash1 = strchr(desc, '/'); |
| 266 | CHECK(slash1 != NULL); |
| 267 | |
| 268 | const char *s = slash1 + 1; |
| 269 | char *end; |
| 270 | unsigned long x = strtoul(s, &end, 10); |
| 271 | CHECK_GT(end, s); |
| 272 | CHECK(*end == '\0' || *end == '/'); |
| 273 | |
| 274 | *timescale = x; |
| 275 | *numChannels = 1; |
| 276 | |
| 277 | if (*end == '/') { |
| 278 | s = end + 1; |
| 279 | unsigned long x = strtoul(s, &end, 10); |
| 280 | CHECK_GT(end, s); |
| 281 | CHECK_EQ(*end, '\0'); |
| 282 | |
| 283 | *numChannels = x; |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | } // namespace android |
| 288 | |