1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/*
* 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 "TimedTextInBandSource"
#include <utils/Log.h>
#include <binder/Parcel.h>
#include <media/stagefright/MediaBuffer.h>
#include <media/stagefright/MediaDebug.h> // CHECK_XX macro
#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 "TimedTextInBandSource.h"
#include "TextDescriptions.h"
namespace android {
TimedTextInBandSource::TimedTextInBandSource(const sp<MediaSource>& mediaSource)
: mSource(mediaSource) {
}
TimedTextInBandSource::~TimedTextInBandSource() {
}
status_t TimedTextInBandSource::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 TimedTextInBandSource::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));
if (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;
}
return ERROR_UNSUPPORTED;
}
// 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 TimedTextInBandSource::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));
// support 3GPP only for now
if (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;
}
return ERROR_UNSUPPORTED;
}
} // namespace android
|
