TimedTextPlayer.cpp revision f9d660a5e0196240add5daf0199f128d471e592c 
1 /*
2 * Copyright (C) 2012 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
17//#define LOG_NDEBUG 0
18#define LOG_TAG "TimedTextPlayer"
19#include <utils/Log.h>
20
21#include <media/stagefright/foundation/ADebug.h>
22#include <media/stagefright/foundation/AMessage.h>
23#include <media/stagefright/timedtext/TimedTextDriver.h>
24#include <media/stagefright/MediaErrors.h>
25#include <media/MediaPlayerInterface.h>
26
27#include "TimedTextPlayer.h"
28
29#include "TimedTextSource.h"
30
31namespace android {
32
33static const int64_t kAdjustmentProcessingTimeUs = 100000ll;
34
35TimedTextPlayer::TimedTextPlayer(const wp<MediaPlayerBase> &listener)
36    : mListener(listener),
37      mSource(NULL),
38      mSendSubtitleGeneration(0) {
39}
40
41TimedTextPlayer::~TimedTextPlayer() {
42    if (mSource != NULL) {
43        mSource->stop();
44        mSource.clear();
45        mSource = NULL;
46    }
47}
48
49void TimedTextPlayer::start() {
50    sp<AMessage> msg = new AMessage(kWhatSeek, id());
51    msg->setInt64("seekTimeUs", -1);
52    msg->post();
53}
54
55void TimedTextPlayer::pause() {
56    (new AMessage(kWhatPause, id()))->post();
57}
58
59void TimedTextPlayer::seekToAsync(int64_t timeUs) {
60    sp<AMessage> msg = new AMessage(kWhatSeek, id());
61    msg->setInt64("seekTimeUs", timeUs);
62    msg->post();
63}
64
65void TimedTextPlayer::setDataSource(sp<TimedTextSource> source) {
66    sp<AMessage> msg = new AMessage(kWhatSetSource, id());
67    msg->setObject("source", source);
68    msg->post();
69}
70
71void TimedTextPlayer::onMessageReceived(const sp<AMessage> &msg) {
72    switch (msg->what()) {
73        case kWhatPause: {
74            mSendSubtitleGeneration++;
75            break;
76        }
77        case kWhatSeek: {
78            int64_t seekTimeUs = 0;
79            msg->findInt64("seekTimeUs", &seekTimeUs);
80            if (seekTimeUs < 0) {
81                sp<MediaPlayerBase> listener = mListener.promote();
82                if (listener != NULL) {
83                    int32_t positionMs = 0;
84                    listener->getCurrentPosition(&positionMs);
85                    seekTimeUs = positionMs * 1000ll;
86                }
87            }
88            doSeekAndRead(seekTimeUs);
89            break;
90        }
91        case kWhatSendSubtitle: {
92            int32_t generation;
93            CHECK(msg->findInt32("generation", &generation));
94            if (generation != mSendSubtitleGeneration) {
95              // Drop obsolete msg.
96              break;
97            }
98            sp<RefBase> obj;
99            msg->findObject("subtitle", &obj);
100            if (obj != NULL) {
101                sp<ParcelEvent> parcelEvent;
102                parcelEvent = static_cast<ParcelEvent*>(obj.get());
103                notifyListener(&(parcelEvent->parcel));
104            } else {
105                notifyListener();
106            }
107            doRead();
108            break;
109        }
110        case kWhatSetSource: {
111            sp<RefBase> obj;
112            msg->findObject("source", &obj);
113            if (obj == NULL) break;
114            if (mSource != NULL) {
115                mSource->stop();
116            }
117            mSource = static_cast<TimedTextSource*>(obj.get());
118            status_t err = mSource->start();
119            if (err != OK) {
120                notifyError(err);
121                break;
122            }
123            Parcel parcel;
124            err = mSource->extractGlobalDescriptions(&parcel);
125            if (err != OK) {
126                notifyError(err);
127                break;
128            }
129            notifyListener(&parcel);
130            break;
131        }
132    }
133}
134
135void TimedTextPlayer::doSeekAndRead(int64_t seekTimeUs) {
136    MediaSource::ReadOptions options;
137    options.setSeekTo(seekTimeUs, MediaSource::ReadOptions::SEEK_PREVIOUS_SYNC);
138    doRead(&options);
139}
140
141void TimedTextPlayer::doRead(MediaSource::ReadOptions* options) {
142    int64_t timeUs = 0;
143    sp<ParcelEvent> parcelEvent = new ParcelEvent();
144    status_t err = mSource->read(&timeUs, &(parcelEvent->parcel), options);
145    if (err != OK) {
146        notifyError(err);
147    } else {
148        postTextEvent(parcelEvent, timeUs);
149    }
150}
151
152void TimedTextPlayer::postTextEvent(const sp<ParcelEvent>& parcel, int64_t timeUs) {
153    sp<MediaPlayerBase> listener = mListener.promote();
154    if (listener != NULL) {
155        int64_t positionUs, delayUs;
156        int32_t positionMs = 0;
157        listener->getCurrentPosition(&positionMs);
158        positionUs = positionMs * 1000ll;
159
160        if (timeUs <= positionUs + kAdjustmentProcessingTimeUs) {
161            delayUs = 0;
162        } else {
163            delayUs = timeUs - positionUs - kAdjustmentProcessingTimeUs;
164        }
165        sp<AMessage> msg = new AMessage(kWhatSendSubtitle, id());
166        msg->setInt32("generation", mSendSubtitleGeneration);
167        if (parcel != NULL) {
168            msg->setObject("subtitle", parcel);
169        }
170        msg->post(delayUs);
171    }
172}
173
174void TimedTextPlayer::notifyError(int error) {
175    sp<MediaPlayerBase> listener = mListener.promote();
176    if (listener != NULL) {
177        listener->sendEvent(MEDIA_INFO, MEDIA_INFO_TIMED_TEXT_ERROR, error);
178    }
179}
180
181void TimedTextPlayer::notifyListener(const Parcel *parcel) {
182    sp<MediaPlayerBase> listener = mListener.promote();
183    if (listener != NULL) {
184        if (parcel != NULL && (parcel->dataSize() > 0)) {
185            listener->sendEvent(MEDIA_TIMED_TEXT, 0, 0, parcel);
186        } else {  // send an empty timed text to clear the screen
187            listener->sendEvent(MEDIA_TIMED_TEXT);
188        }
189    }
190}
191
192}  // namespace android
193