| /* |
| * Copyright (C) 2012 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 "TimedText3GPPSource" |
| #include <utils/Log.h> |
| |
| #include <binder/Parcel.h> |
| #include <media/stagefright/foundation/ADebug.h> // CHECK_XX macro |
| #include <media/stagefright/MediaBuffer.h> |
| #include <media/stagefright/MediaDefs.h> // for MEDIA_MIMETYPE_xxx |
| #include <media/stagefright/MediaErrors.h> |
| #include <media/stagefright/MediaSource.h> |
| #include <media/stagefright/MetaData.h> |
| |
| #include "TimedText3GPPSource.h" |
| #include "TextDescriptions.h" |
| |
| namespace android { |
| |
| TimedText3GPPSource::TimedText3GPPSource(const sp<MediaSource>& mediaSource) |
| : mSource(mediaSource) { |
| } |
| |
| TimedText3GPPSource::~TimedText3GPPSource() { |
| } |
| |
| status_t TimedText3GPPSource::read( |
| int64_t *startTimeUs, int64_t *endTimeUs, Parcel *parcel, |
| const MediaSource::ReadOptions *options) { |
| MediaBuffer *textBuffer = NULL; |
| status_t err = mSource->read(&textBuffer, options); |
| if (err != OK) { |
| return err; |
| } |
| CHECK(textBuffer != NULL); |
| textBuffer->meta_data()->findInt64(kKeyTime, startTimeUs); |
| CHECK_GE(*startTimeUs, 0); |
| extractAndAppendLocalDescriptions(*startTimeUs, textBuffer, parcel); |
| textBuffer->release(); |
| // endTimeUs is a dummy parameter for 3gpp timed text format. |
| // Set a negative value to it to mark it is unavailable. |
| *endTimeUs = -1; |
| return OK; |
| } |
| |
| // Each text sample consists of a string of text, optionally with sample |
| // modifier description. The modifier description could specify a new |
| // text style for the string of text. These descriptions are present only |
| // if they are needed. This method is used to extract the modifier |
| // description and append it at the end of the text. |
| status_t TimedText3GPPSource::extractAndAppendLocalDescriptions( |
| int64_t timeUs, const MediaBuffer *textBuffer, Parcel *parcel) { |
| const void *data; |
| size_t size = 0; |
| int32_t flag = TextDescriptions::LOCAL_DESCRIPTIONS; |
| |
| const char *mime; |
| CHECK(mSource->getFormat()->findCString(kKeyMIMEType, &mime)); |
| CHECK(strcasecmp(mime, MEDIA_MIMETYPE_TEXT_3GPP) == 0); |
| |
| data = textBuffer->data(); |
| size = textBuffer->size(); |
| |
| if (size > 0) { |
| parcel->freeData(); |
| flag |= TextDescriptions::IN_BAND_TEXT_3GPP; |
| return TextDescriptions::getParcelOfDescriptions( |
| (const uint8_t *)data, size, flag, timeUs / 1000, parcel); |
| } |
| return OK; |
| } |
| |
| // To extract and send the global text descriptions for all the text samples |
| // in the text track or text file. |
| // TODO: send error message to application via notifyListener()...? |
| status_t TimedText3GPPSource::extractGlobalDescriptions(Parcel *parcel) { |
| const void *data; |
| size_t size = 0; |
| int32_t flag = TextDescriptions::GLOBAL_DESCRIPTIONS; |
| |
| const char *mime; |
| CHECK(mSource->getFormat()->findCString(kKeyMIMEType, &mime)); |
| CHECK(strcasecmp(mime, MEDIA_MIMETYPE_TEXT_3GPP) == 0); |
| |
| uint32_t type; |
| // get the 'tx3g' box content. This box contains the text descriptions |
| // used to render the text track |
| if (!mSource->getFormat()->findData( |
| kKeyTextFormatData, &type, &data, &size)) { |
| return ERROR_MALFORMED; |
| } |
| |
| if (size > 0) { |
| flag |= TextDescriptions::IN_BAND_TEXT_3GPP; |
| return TextDescriptions::getParcelOfDescriptions( |
| (const uint8_t *)data, size, flag, 0, parcel); |
| } |
| return OK; |
| } |
| |
| sp<MetaData> TimedText3GPPSource::getFormat() { |
| return mSource->getFormat(); |
| } |
| |
| } // namespace android |