MediaPuller.cpp revision a438123bd96c7faf145683876702387efe5628d9 
1/*
2 * Copyright 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 "MediaPuller"
19#include <utils/Log.h>
20
21#include "MediaPuller.h"
22
23#include <media/stagefright/foundation/ABuffer.h>
24#include <media/stagefright/foundation/ADebug.h>
25#include <media/stagefright/foundation/AMessage.h>
26#include <media/stagefright/MediaBuffer.h>
27#include <media/stagefright/MediaSource.h>
28#include <media/stagefright/MetaData.h>
29
30namespace android {
31
32MediaPuller::MediaPuller(
33        const sp<MediaSource> &source, const sp<AMessage> &notify)
34    : mSource(source),
35      mNotify(notify),
36      mPullGeneration(0),
37      mIsAudio(false) {
38    sp<MetaData> meta = source->getFormat();
39    const char *mime;
40    CHECK(meta->findCString(kKeyMIMEType, &mime));
41
42    mIsAudio = !strncasecmp(mime, "audio/", 6);
43}
44
45MediaPuller::~MediaPuller() {
46}
47
48status_t MediaPuller::postSynchronouslyAndReturnError(
49        const sp<AMessage> &msg) {
50    sp<AMessage> response;
51    status_t err = msg->postAndAwaitResponse(&response);
52
53    if (err != OK) {
54        return err;
55    }
56
57    if (!response->findInt32("err", &err)) {
58        err = OK;
59    }
60
61    return err;
62}
63
64status_t MediaPuller::start() {
65    return postSynchronouslyAndReturnError(new AMessage(kWhatStart, id()));
66}
67
68status_t MediaPuller::stop() {
69    return postSynchronouslyAndReturnError(new AMessage(kWhatStop, id()));
70}
71
72void MediaPuller::onMessageReceived(const sp<AMessage> &msg) {
73    switch (msg->what()) {
74        case kWhatStart:
75        case kWhatStop:
76        {
77            status_t err;
78
79            if (msg->what() == kWhatStart) {
80                err = mSource->start();
81
82                if (err == OK) {
83                    schedulePull();
84                }
85            } else {
86                sp<MetaData> meta = mSource->getFormat();
87                const char *tmp;
88                CHECK(meta->findCString(kKeyMIMEType, &tmp));
89                AString mime = tmp;
90
91                ALOGI("MediaPuller(%s) stopping.", mime.c_str());
92                err = mSource->stop();
93                ALOGI("MediaPuller(%s) stopped.", mime.c_str());
94                ++mPullGeneration;
95            }
96
97            sp<AMessage> response = new AMessage;
98            response->setInt32("err", err);
99
100            uint32_t replyID;
101            CHECK(msg->senderAwaitsResponse(&replyID));
102
103            response->postReply(replyID);
104            break;
105        }
106
107        case kWhatPull:
108        {
109            int32_t generation;
110            CHECK(msg->findInt32("generation", &generation));
111
112            if (generation != mPullGeneration) {
113                break;
114            }
115
116            MediaBuffer *mbuf;
117            status_t err = mSource->read(&mbuf);
118
119            if (err != OK) {
120                if (err == ERROR_END_OF_STREAM) {
121                    ALOGI("stream ended.");
122                } else {
123                    ALOGE("error %d reading stream.", err);
124                }
125
126                sp<AMessage> notify = mNotify->dup();
127                notify->setInt32("what", kWhatEOS);
128                notify->post();
129            } else {
130                int64_t timeUs;
131                CHECK(mbuf->meta_data()->findInt64(kKeyTime, &timeUs));
132
133                sp<ABuffer> accessUnit = new ABuffer(mbuf->range_length());
134
135                memcpy(accessUnit->data(),
136                       (const uint8_t *)mbuf->data() + mbuf->range_offset(),
137                       mbuf->range_length());
138
139                accessUnit->meta()->setInt64("timeUs", timeUs);
140
141                if (mIsAudio) {
142                    mbuf->release();
143                    mbuf = NULL;
144                } else {
145                    // video encoder will release MediaBuffer when done
146                    // with underlying data.
147                    accessUnit->meta()->setPointer("mediaBuffer", mbuf);
148                }
149
150                sp<AMessage> notify = mNotify->dup();
151
152                notify->setInt32("what", kWhatAccessUnit);
153                notify->setBuffer("accessUnit", accessUnit);
154                notify->post();
155
156                schedulePull();
157            }
158            break;
159        }
160
161        default:
162            TRESPASS();
163    }
164}
165
166void MediaPuller::schedulePull() {
167    sp<AMessage> msg = new AMessage(kWhatPull, id());
168    msg->setInt32("generation", mPullGeneration);
169    msg->post();
170}
171
172}  // namespace android
173
174