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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//#define LOG_NDEBUG 0
#define LOG_TAG "M3UParser"
#include <utils/Log.h>
#include "include/M3UParser.h"
#include <media/stagefright/foundation/ADebug.h>
#include <media/stagefright/foundation/AMessage.h>
#include <media/stagefright/MediaErrors.h>
namespace android {
M3UParser::M3UParser(
const char *baseURI, const void *data, size_t size)
: mInitCheck(NO_INIT),
mBaseURI(baseURI),
mIsExtM3U(false),
mIsVariantPlaylist(false),
mIsComplete(false) {
mInitCheck = parse(data, size);
}
M3UParser::~M3UParser() {
}
status_t M3UParser::initCheck() const {
return mInitCheck;
}
bool M3UParser::isExtM3U() const {
return mIsExtM3U;
}
bool M3UParser::isVariantPlaylist() const {
return mIsVariantPlaylist;
}
bool M3UParser::isComplete() const {
return mIsComplete;
}
sp<AMessage> M3UParser::meta() {
return mMeta;
}
size_t M3UParser::size() {
return mItems.size();
}
bool M3UParser::itemAt(size_t index, AString *uri, sp<AMessage> *meta) {
uri->clear();
if (meta) { *meta = NULL; }
if (index >= mItems.size()) {
return false;
}
*uri = mItems.itemAt(index).mURI;
if (meta) {
*meta = mItems.itemAt(index).mMeta;
}
return true;
}
static bool MakeURL(const char *baseURL, const char *url, AString *out) {
out->clear();
if (strncasecmp("http://", baseURL, 7)
&& strncasecmp("https://", baseURL, 8)
&& strncasecmp("file://", baseURL, 7)) {
// Base URL must be absolute
return false;
}
if (!strncasecmp("http://", url, 7) || !strncasecmp("https://", url, 8)) {
// "url" is already an absolute URL, ignore base URL.
out->setTo(url);
LOGV("base:'%s', url:'%s' => '%s'", baseURL, url, out->c_str());
return true;
}
size_t n = strlen(baseURL);
if (baseURL[n - 1] == '/') {
out->setTo(baseURL);
out->append(url);
} else {
const char *slashPos = strrchr(baseURL, '/');
if (slashPos > &baseURL[6]) {
out->setTo(baseURL, slashPos - baseURL);
} else {
out->setTo(baseURL);
}
out->append("/");
out->append(url);
}
LOGV("base:'%s', url:'%s' => '%s'", baseURL, url, out->c_str());
return true;
}
status_t M3UParser::parse(const void *_data, size_t size) {
int32_t lineNo = 0;
sp<AMessage> itemMeta;
const char *data = (const char *)_data;
size_t offset = 0;
while (offset < size) {
size_t offsetLF = offset;
while (offsetLF < size && data[offsetLF] != '\n') {
++offsetLF;
}
if (offsetLF >= size) {
break;
}
AString line;
if (offsetLF > offset && data[offsetLF - 1] == '\r') {
line.setTo(&data[offset], offsetLF - offset - 1);
} else {
line.setTo(&data[offset], offsetLF - offset);
}
// LOGI("#%s#", line.c_str());
if (line.empty()) {
offset = offsetLF + 1;
continue;
}
if (lineNo == 0 && line == "#EXTM3U") {
mIsExtM3U = true;
}
if (mIsExtM3U) {
status_t err = OK;
if (line.startsWith("#EXT-X-TARGETDURATION")) {
if (mIsVariantPlaylist) {
return ERROR_MALFORMED;
}
err = parseMetaData(line, &mMeta, "target-duration");
} else if (line.startsWith("#EXT-X-MEDIA-SEQUENCE")) {
if (mIsVariantPlaylist) {
return ERROR_MALFORMED;
}
err = parseMetaData(line, &mMeta, "media-sequence");
} else if (line.startsWith("#EXT-X-KEY")) {
if (mIsVariantPlaylist) {
return ERROR_MALFORMED;
}
err = parseCipherInfo(line, &itemMeta, mBaseURI);
} else if (line.startsWith("#EXT-X-ENDLIST")) {
mIsComplete = true;
} else if (line.startsWith("#EXTINF")) {
if (mIsVariantPlaylist) {
return ERROR_MALFORMED;
}
err = parseMetaData(line, &itemMeta, "duration");
} else if (line.startsWith("#EXT-X-DISCONTINUITY")) {
if (mIsVariantPlaylist) {
return ERROR_MALFORMED;
}
if (itemMeta == NULL) {
itemMeta = new AMessage;
}
itemMeta->setInt32("discontinuity", true);
} else if (line.startsWith("#EXT-X-STREAM-INF")) {
if (mMeta != NULL) {
return ERROR_MALFORMED;
}
mIsVariantPlaylist = true;
err = parseStreamInf(line, &itemMeta);
}
if (err != OK) {
return err;
}
}
if (!line.startsWith("#")) {
if (!mIsVariantPlaylist) {
int32_t durationSecs;
if (itemMeta == NULL
|| !itemMeta->findInt32("duration", &durationSecs)) {
return ERROR_MALFORMED;
}
}
mItems.push();
Item *item = &mItems.editItemAt(mItems.size() - 1);
CHECK(MakeURL(mBaseURI.c_str(), line.c_str(), &item->mURI));
item->mMeta = itemMeta;
itemMeta.clear();
}
offset = offsetLF + 1;
++lineNo;
}
return OK;
}
// static
status_t M3UParser::parseMetaData(
const AString &line, sp<AMessage> *meta, const char *key) {
ssize_t colonPos = line.find(":");
if (colonPos < 0) {
return ERROR_MALFORMED;
}
int32_t x;
status_t err = ParseInt32(line.c_str() + colonPos + 1, &x);
if (err != OK) {
return err;
}
if (meta->get() == NULL) {
*meta = new AMessage;
}
(*meta)->setInt32(key, x);
return OK;
}
// static
status_t M3UParser::parseStreamInf(
const AString &line, sp<AMessage> *meta) {
ssize_t colonPos = line.find(":");
if (colonPos < 0) {
return ERROR_MALFORMED;
}
size_t offset = colonPos + 1;
while (offset < line.size()) {
ssize_t end = line.find(",", offset);
if (end < 0) {
end = line.size();
}
AString attr(line, offset, end - offset);
attr.trim();
offset = end + 1;
ssize_t equalPos = attr.find("=");
if (equalPos < 0) {
continue;
}
AString key(attr, 0, equalPos);
key.trim();
AString val(attr, equalPos + 1, attr.size() - equalPos - 1);
val.trim();
LOGV("key=%s value=%s", key.c_str(), val.c_str());
if (!strcasecmp("bandwidth", key.c_str())) {
const char *s = val.c_str();
char *end;
unsigned long x = strtoul(s, &end, 10);
if (end == s || *end != '\0') {
// malformed
continue;
}
if (meta->get() == NULL) {
*meta = new AMessage;
}
(*meta)->setInt32("bandwidth", x);
}
}
return OK;
}
// Find the next occurence of the character "what" at or after "offset",
// but ignore occurences between quotation marks.
// Return the index of the occurrence or -1 if not found.
static ssize_t FindNextUnquoted(
const AString &line, char what, size_t offset) {
CHECK_NE((int)what, (int)'"');
bool quoted = false;
while (offset < line.size()) {
char c = line.c_str()[offset];
if (c == '"') {
quoted = !quoted;
} else if (c == what && !quoted) {
return offset;
}
++offset;
}
return -1;
}
// static
status_t M3UParser::parseCipherInfo(
const AString &line, sp<AMessage> *meta, const AString &baseURI) {
ssize_t colonPos = line.find(":");
if (colonPos < 0) {
return ERROR_MALFORMED;
}
size_t offset = colonPos + 1;
while (offset < line.size()) {
ssize_t end = FindNextUnquoted(line, ',', offset);
if (end < 0) {
end = line.size();
}
AString attr(line, offset, end - offset);
attr.trim();
offset = end + 1;
ssize_t equalPos = attr.find("=");
if (equalPos < 0) {
continue;
}
AString key(attr, 0, equalPos);
key.trim();
AString val(attr, equalPos + 1, attr.size() - equalPos - 1);
val.trim();
LOGV("key=%s value=%s", key.c_str(), val.c_str());
key.tolower();
if (key == "method" || key == "uri" || key == "iv") {
if (meta->get() == NULL) {
*meta = new AMessage;
}
if (key == "uri") {
if (val.size() >= 2
&& val.c_str()[0] == '"'
&& val.c_str()[val.size() - 1] == '"') {
// Remove surrounding quotes.
AString tmp(val, 1, val.size() - 2);
val = tmp;
}
AString absURI;
if (MakeURL(baseURI.c_str(), val.c_str(), &absURI)) {
val = absURI;
} else {
LOGE("failed to make absolute url for '%s'.",
val.c_str());
}
}
key.insert(AString("cipher-"), 0);
(*meta)->setString(key.c_str(), val.c_str(), val.size());
}
}
return OK;
}
// static
status_t M3UParser::ParseInt32(const char *s, int32_t *x) {
char *end;
long lval = strtol(s, &end, 10);
if (end == s || (*end != '\0' && *end != ',')) {
return ERROR_MALFORMED;
}
*x = (int32_t)lval;
return OK;
}
} // namespace android
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