1/*
2 * Copyright (C) 2010 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 "LiveDataSource"
19#include <utils/Log.h>
20
21#include "LiveDataSource.h"
22
23#include <media/stagefright/foundation/ABuffer.h>
24#include <media/stagefright/foundation/ADebug.h>
25
26#define SAVE_BACKUP     0
27
28namespace android {
29
30LiveDataSource::LiveDataSource()
31    : mOffset(0),
32      mFinalResult(OK),
33      mBackupFile(NULL) {
34#if SAVE_BACKUP
35    mBackupFile = fopen("/data/misc/backup.ts", "wb");
36    CHECK(mBackupFile != NULL);
37#endif
38}
39
40LiveDataSource::~LiveDataSource() {
41    if (mBackupFile != NULL) {
42        fclose(mBackupFile);
43        mBackupFile = NULL;
44    }
45}
46
47status_t LiveDataSource::initCheck() const {
48    return OK;
49}
50
51size_t LiveDataSource::countQueuedBuffers() {
52    Mutex::Autolock autoLock(mLock);
53
54    return mBufferQueue.size();
55}
56
57ssize_t LiveDataSource::readAtNonBlocking(
58        off64_t offset, void *data, size_t size) {
59    Mutex::Autolock autoLock(mLock);
60
61    if (offset != mOffset) {
62        ALOGE("Attempt at reading non-sequentially from LiveDataSource.");
63        return -EPIPE;
64    }
65
66    size_t totalAvailable = 0;
67    for (List<sp<ABuffer> >::iterator it = mBufferQueue.begin();
68         it != mBufferQueue.end(); ++it) {
69        sp<ABuffer> buffer = *it;
70
71        totalAvailable += buffer->size();
72
73        if (totalAvailable >= size) {
74            break;
75        }
76    }
77
78    if (totalAvailable < size) {
79        return mFinalResult == OK ? -EWOULDBLOCK : mFinalResult;
80    }
81
82    return readAt_l(offset, data, size);
83}
84
85ssize_t LiveDataSource::readAt(off64_t offset, void *data, size_t size) {
86    Mutex::Autolock autoLock(mLock);
87    return readAt_l(offset, data, size);
88}
89
90ssize_t LiveDataSource::readAt_l(off64_t offset, void *data, size_t size) {
91    if (offset != mOffset) {
92        ALOGE("Attempt at reading non-sequentially from LiveDataSource.");
93        return -EPIPE;
94    }
95
96    size_t sizeDone = 0;
97
98    while (sizeDone < size) {
99        while (mBufferQueue.empty() && mFinalResult == OK) {
100            mCondition.wait(mLock);
101        }
102
103        if (mBufferQueue.empty()) {
104            if (sizeDone > 0) {
105                mOffset += sizeDone;
106                return sizeDone;
107            }
108
109            return mFinalResult;
110        }
111
112        sp<ABuffer> buffer = *mBufferQueue.begin();
113
114        size_t copy = size - sizeDone;
115
116        if (copy > buffer->size()) {
117            copy = buffer->size();
118        }
119
120        memcpy((uint8_t *)data + sizeDone, buffer->data(), copy);
121
122        sizeDone += copy;
123
124        buffer->setRange(buffer->offset() + copy, buffer->size() - copy);
125
126        if (buffer->size() == 0) {
127            mBufferQueue.erase(mBufferQueue.begin());
128        }
129    }
130
131    mOffset += sizeDone;
132
133    return sizeDone;
134}
135
136void LiveDataSource::queueBuffer(const sp<ABuffer> &buffer) {
137    Mutex::Autolock autoLock(mLock);
138
139    if (mFinalResult != OK) {
140        return;
141    }
142
143#if SAVE_BACKUP
144    if (mBackupFile != NULL) {
145        CHECK_EQ(fwrite(buffer->data(), 1, buffer->size(), mBackupFile),
146                 buffer->size());
147    }
148#endif
149
150    mBufferQueue.push_back(buffer);
151    mCondition.broadcast();
152}
153
154void LiveDataSource::queueEOS(status_t finalResult) {
155    CHECK_NE(finalResult, (status_t)OK);
156
157    Mutex::Autolock autoLock(mLock);
158
159    mFinalResult = finalResult;
160    mCondition.broadcast();
161}
162
163void LiveDataSource::reset() {
164    Mutex::Autolock autoLock(mLock);
165
166    // XXX FIXME: If we've done a partial read and waiting for more buffers,
167    // we'll mix old and new data...
168
169    mFinalResult = OK;
170    mBufferQueue.clear();
171}
172
173}  // namespace android
174