diff options
Diffstat (limited to 'media/libstagefright/timedtext/TimedText3GPPSource.cpp')
-rw-r--r-- | media/libstagefright/timedtext/TimedText3GPPSource.cpp | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/media/libstagefright/timedtext/TimedText3GPPSource.cpp b/media/libstagefright/timedtext/TimedText3GPPSource.cpp new file mode 100644 index 0000000..4a3bfd3 --- /dev/null +++ b/media/libstagefright/timedtext/TimedText3GPPSource.cpp @@ -0,0 +1,113 @@ + /* + * 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 *timeUs, 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, timeUs); + // TODO: this is legacy code. when 'timeUs' can be <= 0? + if (*timeUs > 0) { + extractAndAppendLocalDescriptions(*timeUs, textBuffer, parcel); + } + textBuffer->release(); + 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; +} + +} // namespace android |