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 | |
Andreas Huber | 6e3fa44 | 2010-09-21 13:13:15 -0700 | [diff] [blame] | 17 | //#define LOG_NDEBUG 0 |
| 18 | #define LOG_TAG "ASessionDescription" |
| 19 | #include <utils/Log.h> |
| 20 | |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 21 | #include "ASessionDescription.h" |
| 22 | |
| 23 | #include <media/stagefright/foundation/ADebug.h> |
| 24 | #include <media/stagefright/foundation/AString.h> |
| 25 | |
| 26 | #include <stdlib.h> |
| 27 | |
| 28 | namespace android { |
| 29 | |
| 30 | ASessionDescription::ASessionDescription() |
| 31 | : mIsValid(false) { |
| 32 | } |
| 33 | |
| 34 | ASessionDescription::~ASessionDescription() { |
| 35 | } |
| 36 | |
| 37 | bool ASessionDescription::setTo(const void *data, size_t size) { |
| 38 | mIsValid = parse(data, size); |
| 39 | |
| 40 | if (!mIsValid) { |
| 41 | mTracks.clear(); |
| 42 | mFormats.clear(); |
| 43 | } |
| 44 | |
| 45 | return mIsValid; |
| 46 | } |
| 47 | |
| 48 | bool ASessionDescription::parse(const void *data, size_t size) { |
| 49 | mTracks.clear(); |
| 50 | mFormats.clear(); |
| 51 | |
| 52 | mTracks.push(Attribs()); |
| 53 | mFormats.push(AString("[root]")); |
| 54 | |
| 55 | AString desc((const char *)data, size); |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 56 | |
| 57 | size_t i = 0; |
| 58 | for (;;) { |
Andreas Huber | a0b442e | 2010-10-20 15:00:34 -0700 | [diff] [blame] | 59 | ssize_t eolPos = desc.find("\n", i); |
| 60 | |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 61 | if (eolPos < 0) { |
| 62 | break; |
| 63 | } |
| 64 | |
Andreas Huber | a0b442e | 2010-10-20 15:00:34 -0700 | [diff] [blame] | 65 | AString line; |
| 66 | if ((size_t)eolPos > i && desc.c_str()[eolPos - 1] == '\r') { |
| 67 | // We accept both '\n' and '\r\n' line endings, if it's |
| 68 | // the latter, strip the '\r' as well. |
| 69 | line.setTo(desc, i, eolPos - i - 1); |
| 70 | } else { |
| 71 | line.setTo(desc, i, eolPos - i); |
| 72 | } |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 73 | |
Andreas Huber | 0407269 | 2011-02-15 10:39:48 -0800 | [diff] [blame] | 74 | if (line.empty()) { |
| 75 | i = eolPos + 1; |
| 76 | continue; |
| 77 | } |
| 78 | |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 79 | if (line.size() < 2 || line.c_str()[1] != '=') { |
| 80 | return false; |
| 81 | } |
| 82 | |
Andreas Huber | b0d25a0 | 2010-10-27 13:59:59 -0700 | [diff] [blame] | 83 | LOGI("%s", line.c_str()); |
| 84 | |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 85 | switch (line.c_str()[0]) { |
| 86 | case 'v': |
| 87 | { |
| 88 | if (strcmp(line.c_str(), "v=0")) { |
| 89 | return false; |
| 90 | } |
| 91 | break; |
| 92 | } |
| 93 | |
| 94 | case 'a': |
| 95 | case 'b': |
| 96 | { |
| 97 | AString key, value; |
| 98 | |
| 99 | ssize_t colonPos = line.find(":", 2); |
| 100 | if (colonPos < 0) { |
| 101 | key = line; |
| 102 | } else { |
| 103 | key.setTo(line, 0, colonPos); |
| 104 | |
| 105 | if (key == "a=fmtp" || key == "a=rtpmap" |
| 106 | || key == "a=framesize") { |
| 107 | ssize_t spacePos = line.find(" ", colonPos + 1); |
| 108 | if (spacePos < 0) { |
| 109 | return false; |
| 110 | } |
| 111 | |
| 112 | key.setTo(line, 0, spacePos); |
| 113 | |
| 114 | colonPos = spacePos; |
| 115 | } |
| 116 | |
| 117 | value.setTo(line, colonPos + 1, line.size() - colonPos - 1); |
| 118 | } |
| 119 | |
| 120 | key.trim(); |
| 121 | value.trim(); |
| 122 | |
Steve Block | 71f2cf1 | 2011-10-20 11:56:00 +0100 | [diff] [blame] | 123 | ALOGV("adding '%s' => '%s'", key.c_str(), value.c_str()); |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 124 | |
| 125 | mTracks.editItemAt(mTracks.size() - 1).add(key, value); |
| 126 | break; |
| 127 | } |
| 128 | |
| 129 | case 'm': |
| 130 | { |
Steve Block | 71f2cf1 | 2011-10-20 11:56:00 +0100 | [diff] [blame] | 131 | ALOGV("new section '%s'", |
Andreas Huber | 6e3fa44 | 2010-09-21 13:13:15 -0700 | [diff] [blame] | 132 | AString(line, 2, line.size() - 2).c_str()); |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 133 | |
| 134 | mTracks.push(Attribs()); |
| 135 | mFormats.push(AString(line, 2, line.size() - 2)); |
| 136 | break; |
| 137 | } |
Andreas Huber | 57648e4 | 2010-08-04 10:14:30 -0700 | [diff] [blame] | 138 | |
| 139 | default: |
| 140 | { |
| 141 | AString key, value; |
| 142 | |
| 143 | ssize_t equalPos = line.find("="); |
| 144 | |
| 145 | key = AString(line, 0, equalPos + 1); |
| 146 | value = AString(line, equalPos + 1, line.size() - equalPos - 1); |
| 147 | |
| 148 | key.trim(); |
| 149 | value.trim(); |
| 150 | |
Steve Block | 71f2cf1 | 2011-10-20 11:56:00 +0100 | [diff] [blame] | 151 | ALOGV("adding '%s' => '%s'", key.c_str(), value.c_str()); |
Andreas Huber | 57648e4 | 2010-08-04 10:14:30 -0700 | [diff] [blame] | 152 | |
| 153 | mTracks.editItemAt(mTracks.size() - 1).add(key, value); |
| 154 | break; |
| 155 | } |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 156 | } |
| 157 | |
Andreas Huber | a0b442e | 2010-10-20 15:00:34 -0700 | [diff] [blame] | 158 | i = eolPos + 1; |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | return true; |
| 162 | } |
| 163 | |
| 164 | bool ASessionDescription::isValid() const { |
| 165 | return mIsValid; |
| 166 | } |
| 167 | |
| 168 | size_t ASessionDescription::countTracks() const { |
| 169 | return mTracks.size(); |
| 170 | } |
| 171 | |
| 172 | void ASessionDescription::getFormat(size_t index, AString *value) const { |
| 173 | CHECK_GE(index, 0u); |
| 174 | CHECK_LT(index, mTracks.size()); |
| 175 | |
| 176 | *value = mFormats.itemAt(index); |
| 177 | } |
| 178 | |
| 179 | bool ASessionDescription::findAttribute( |
| 180 | size_t index, const char *key, AString *value) const { |
| 181 | CHECK_GE(index, 0u); |
| 182 | CHECK_LT(index, mTracks.size()); |
| 183 | |
| 184 | value->clear(); |
| 185 | |
| 186 | const Attribs &track = mTracks.itemAt(index); |
| 187 | ssize_t i = track.indexOfKey(AString(key)); |
| 188 | |
| 189 | if (i < 0) { |
| 190 | return false; |
| 191 | } |
| 192 | |
| 193 | *value = track.valueAt(i); |
| 194 | |
| 195 | return true; |
| 196 | } |
| 197 | |
| 198 | void ASessionDescription::getFormatType( |
| 199 | size_t index, unsigned long *PT, |
| 200 | AString *desc, AString *params) const { |
| 201 | AString format; |
| 202 | getFormat(index, &format); |
| 203 | |
Mike Lockwood | 5a23f8c | 2010-07-15 14:58:25 -0400 | [diff] [blame] | 204 | const char *lastSpacePos = strrchr(format.c_str(), ' '); |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 205 | CHECK(lastSpacePos != NULL); |
| 206 | |
| 207 | char *end; |
| 208 | unsigned long x = strtoul(lastSpacePos + 1, &end, 10); |
| 209 | CHECK_GT(end, lastSpacePos + 1); |
| 210 | CHECK_EQ(*end, '\0'); |
| 211 | |
| 212 | *PT = x; |
| 213 | |
| 214 | char key[20]; |
| 215 | sprintf(key, "a=rtpmap:%lu", x); |
| 216 | |
| 217 | CHECK(findAttribute(index, key, desc)); |
| 218 | |
| 219 | sprintf(key, "a=fmtp:%lu", x); |
| 220 | if (!findAttribute(index, key, params)) { |
| 221 | params->clear(); |
| 222 | } |
| 223 | } |
| 224 | |
Andreas Huber | af063a6 | 2010-08-18 10:17:18 -0700 | [diff] [blame] | 225 | bool ASessionDescription::getDimensions( |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 226 | size_t index, unsigned long PT, |
| 227 | int32_t *width, int32_t *height) const { |
Andreas Huber | af063a6 | 2010-08-18 10:17:18 -0700 | [diff] [blame] | 228 | *width = 0; |
| 229 | *height = 0; |
| 230 | |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 231 | char key[20]; |
| 232 | sprintf(key, "a=framesize:%lu", PT); |
| 233 | AString value; |
Andreas Huber | af063a6 | 2010-08-18 10:17:18 -0700 | [diff] [blame] | 234 | if (!findAttribute(index, key, &value)) { |
| 235 | return false; |
| 236 | } |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 237 | |
| 238 | const char *s = value.c_str(); |
| 239 | char *end; |
| 240 | *width = strtoul(s, &end, 10); |
| 241 | CHECK_GT(end, s); |
| 242 | CHECK_EQ(*end, '-'); |
| 243 | |
| 244 | s = end + 1; |
| 245 | *height = strtoul(s, &end, 10); |
| 246 | CHECK_GT(end, s); |
| 247 | CHECK_EQ(*end, '\0'); |
Andreas Huber | af063a6 | 2010-08-18 10:17:18 -0700 | [diff] [blame] | 248 | |
| 249 | return true; |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 250 | } |
| 251 | |
| 252 | bool ASessionDescription::getDurationUs(int64_t *durationUs) const { |
| 253 | *durationUs = 0; |
| 254 | |
| 255 | CHECK(mIsValid); |
| 256 | |
| 257 | AString value; |
| 258 | if (!findAttribute(0, "a=range", &value)) { |
| 259 | return false; |
| 260 | } |
| 261 | |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 262 | if (strncmp(value.c_str(), "npt=", 4)) { |
| 263 | return false; |
| 264 | } |
| 265 | |
Andreas Huber | a2edd7d8 | 2011-01-28 09:19:12 -0800 | [diff] [blame] | 266 | float from, to; |
| 267 | if (!parseNTPRange(value.c_str() + 4, &from, &to)) { |
Andreas Huber | 4bca5e1 | 2011-01-12 09:57:23 -0800 | [diff] [blame] | 268 | return false; |
| 269 | } |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 270 | |
| 271 | *durationUs = (int64_t)((to - from) * 1E6); |
| 272 | |
| 273 | return true; |
| 274 | } |
| 275 | |
| 276 | // static |
| 277 | void ASessionDescription::ParseFormatDesc( |
| 278 | const char *desc, int32_t *timescale, int32_t *numChannels) { |
| 279 | const char *slash1 = strchr(desc, '/'); |
| 280 | CHECK(slash1 != NULL); |
| 281 | |
| 282 | const char *s = slash1 + 1; |
| 283 | char *end; |
| 284 | unsigned long x = strtoul(s, &end, 10); |
| 285 | CHECK_GT(end, s); |
| 286 | CHECK(*end == '\0' || *end == '/'); |
| 287 | |
| 288 | *timescale = x; |
| 289 | *numChannels = 1; |
| 290 | |
| 291 | if (*end == '/') { |
| 292 | s = end + 1; |
| 293 | unsigned long x = strtoul(s, &end, 10); |
| 294 | CHECK_GT(end, s); |
| 295 | CHECK_EQ(*end, '\0'); |
| 296 | |
| 297 | *numChannels = x; |
| 298 | } |
| 299 | } |
| 300 | |
Andreas Huber | a2edd7d8 | 2011-01-28 09:19:12 -0800 | [diff] [blame] | 301 | // static |
| 302 | bool ASessionDescription::parseNTPRange( |
| 303 | const char *s, float *npt1, float *npt2) { |
| 304 | if (s[0] == '-') { |
| 305 | return false; // no start time available. |
| 306 | } |
| 307 | |
| 308 | if (!strncmp("now", s, 3)) { |
| 309 | return false; // no absolute start time available |
| 310 | } |
| 311 | |
| 312 | char *end; |
| 313 | *npt1 = strtof(s, &end); |
| 314 | |
| 315 | if (end == s || *end != '-') { |
| 316 | // Failed to parse float or trailing "dash". |
| 317 | return false; |
| 318 | } |
| 319 | |
| 320 | s = end + 1; // skip the dash. |
| 321 | |
| 322 | if (!strncmp("now", s, 3)) { |
| 323 | return false; // no absolute end time available |
| 324 | } |
| 325 | |
| 326 | *npt2 = strtof(s, &end); |
| 327 | |
| 328 | if (end == s || *end != '\0') { |
| 329 | return false; |
| 330 | } |
| 331 | |
| 332 | return *npt2 > *npt1; |
| 333 | } |
| 334 | |
Andreas Huber | 7a747b8 | 2010-06-07 15:19:40 -0700 | [diff] [blame] | 335 | } // namespace android |
| 336 | |