1 /*
2 * Copyright (C) 2011 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 USE_LOG SLAndroidLogLevel_Verbose
18
19 #include "sles_allinclusive.h"
20 #include "android/BufferQueueSource.h"
21
22 #include <media/stagefright/MediaDebug.h>
23 #include <sys/types.h>
24 #include <unistd.h>
25 #include <sys/types.h>
26 #include <sys/stat.h>
27 #include <fcntl.h>
28
29 namespace android {
30
31
32 const SLuint32 BufferQueueSource::kItemProcessed[NB_BUFFEREVENT_ITEM_FIELDS] = {
33 SL_ANDROID_ITEMKEY_BUFFERQUEUEEVENT, // item key
34 sizeof(SLuint32), // item size
35 SL_ANDROIDBUFFERQUEUEEVENT_PROCESSED // item data
36 };
37
38
BufferQueueSource(const void * user,void * context,const void * caller)39 BufferQueueSource::BufferQueueSource(const void* user, void *context, const void *caller) :
40 mAndroidBufferQueueSource(NULL),
41 mStreamToBqOffset(0),
42 mEosReached(false)
43 {
44 if (NULL != user) {
45 mAndroidBufferQueueSource = &((CAudioPlayer*)user)->mAndroidBufferQueue;
46 } else {
47 SL_LOGE("Can't create BufferQueueSource with NULL user");
48 }
49
50 }
51
52
~BufferQueueSource()53 BufferQueueSource::~BufferQueueSource() {
54 SL_LOGD("BufferQueueSource::~BufferQueueSource");
55 }
56
57
58 //--------------------------------------------------------------------------
initCheck() const59 status_t BufferQueueSource::initCheck() const {
60 return mAndroidBufferQueueSource != NULL ? OK : NO_INIT;
61 }
62
readAt(off64_t offset,void * data,size_t size)63 ssize_t BufferQueueSource::readAt(off64_t offset, void *data, size_t size) {
64 SL_LOGD("BufferQueueSource::readAt(offset=%lld, data=%p, size=%d)", offset, data, size);
65
66 if (mEosReached) {
67 // once EOS has been received from the buffer queue, you can't read anymore
68 return 0;
69 }
70
71 ssize_t readSize;
72 slAndroidBufferQueueCallback callback = NULL;
73 void* pBufferContext, *pBufferData, *callbackPContext;
74 uint32_t dataSize, dataUsed;
75
76 interface_lock_exclusive(mAndroidBufferQueueSource);
77
78 if (mAndroidBufferQueueSource->mState.count == 0) {
79 readSize = 0;
80 } else {
81 assert(mAndroidBufferQueueSource->mFront != mAndroidBufferQueueSource->mRear);
82
83 AdvancedBufferHeader *oldFront = mAndroidBufferQueueSource->mFront;
84 AdvancedBufferHeader *newFront = &oldFront[1];
85
86 // where to read from
87 char *pSrc = NULL;
88 // can this read operation cause us to call the buffer queue callback
89 // (either because there was a command with no data, or all the data has been consumed)
90 bool queueCallbackCandidate = false;
91
92 // consume events when starting to read data from a buffer for the first time
93 if (oldFront->mDataSizeConsumed == 0) {
94 if (oldFront->mItems.mAdtsCmdData.mAdtsCmdCode & ANDROID_ADTSEVENT_EOS) {
95 mEosReached = true;
96 // EOS has no associated data
97 queueCallbackCandidate = true;
98 }
99 oldFront->mItems.mAdtsCmdData.mAdtsCmdCode = ANDROID_ADTSEVENT_NONE;
100 }
101
102 //assert(mStreamToBqOffset <= offset);
103 CHECK(mStreamToBqOffset <= offset);
104
105 if (offset + size <= mStreamToBqOffset + oldFront->mDataSize) {
106 pSrc = ((char*)oldFront->mDataBuffer) + (offset - mStreamToBqOffset);
107
108 if (offset - mStreamToBqOffset + size == oldFront->mDataSize) {
109 // consumed buffer entirely
110 oldFront->mDataSizeConsumed = oldFront->mDataSize;
111 mStreamToBqOffset += oldFront->mDataSize;
112 queueCallbackCandidate = true;
113
114 // move queue to next buffer
115 if (newFront == &mAndroidBufferQueueSource->
116 mBufferArray[mAndroidBufferQueueSource->mNumBuffers + 1]) {
117 // reached the end, circle back
118 newFront = mAndroidBufferQueueSource->mBufferArray;
119 }
120 mAndroidBufferQueueSource->mFront = newFront;
121 // update the queue state
122 mAndroidBufferQueueSource->mState.count--;
123 mAndroidBufferQueueSource->mState.index++;
124 SL_LOGV("BufferQueueSource moving to next buffer");
125 }
126 }
127
128 // consume data: copy to given destination
129 if (NULL != pSrc) {
130 memcpy(data, pSrc, size);
131 readSize = size;
132 } else {
133 readSize = 0;
134 }
135
136 if (queueCallbackCandidate) {
137 // data has been consumed, and the buffer queue state has been updated
138 // we will notify the client if applicable
139 if (mAndroidBufferQueueSource->mCallbackEventsMask &
140 SL_ANDROIDBUFFERQUEUEEVENT_PROCESSED) {
141 callback = mAndroidBufferQueueSource->mCallback;
142 // save callback data while under lock
143 callbackPContext = mAndroidBufferQueueSource->mContext;
144 pBufferContext = (void *)oldFront->mBufferContext;
145 pBufferData = (void *)oldFront->mDataBuffer;
146 dataSize = oldFront->mDataSize;
147 dataUsed = oldFront->mDataSizeConsumed;
148 }
149 }
150 }
151
152 interface_unlock_exclusive(mAndroidBufferQueueSource);
153
154 // notify client
155 if (NULL != callback) {
156 SLresult result = (*callback)(&mAndroidBufferQueueSource->mItf, callbackPContext,
157 pBufferContext, pBufferData, dataSize, dataUsed,
158 // no messages during playback other than marking the buffer as processed
159 (const SLAndroidBufferItem*)(&kItemProcessed) /* pItems */,
160 NB_BUFFEREVENT_ITEM_FIELDS * sizeof(SLuint32) /* itemsLength */ );
161 if (SL_RESULT_SUCCESS != result) {
162 // Reserved for future use
163 SL_LOGW("Unsuccessful result %d returned from AndroidBufferQueueCallback", result);
164 }
165 }
166
167 return readSize;
168 }
169
170
getSize(off64_t * size)171 status_t BufferQueueSource::getSize(off64_t *size) {
172 SL_LOGD("BufferQueueSource::getSize()");
173 // we're streaming, we don't know how much there is
174 *size = 0;
175 return OK;
176 }
177
178 } // namespace android
179