OutputMixExt.h revision bcc5c7225e3b7a1dbf2e9e830987f69167acf06f 
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/** \file OutputMixExt.h OutputMixExt interface */
18
19#ifdef __cplusplus
20extern "C" {
21#endif
22extern const SLInterfaceID SL_IID_OUTPUTMIXEXT;
23#ifdef __cplusplus
24}
25#endif
26
27typedef const struct SLOutputMixExtItf_ * const * SLOutputMixExtItf;
28
29/** \brief v-table for IOutputMixExt */
30
31struct SLOutputMixExtItf_ {
32    void (*FillBuffer)(SLOutputMixExtItf self, void *pBuffer, SLuint32 size);
33};
34
35/** \brief Track describes each PCM input source to OutputMix */
36
37typedef struct {
38    struct BufferQueue_interface *mBufferQueue;
39    CAudioPlayer *mAudioPlayer; ///< Mixer examines this track if non-NULL
40    const void *mReader;    ///< Pointer to next frame in BufferHeader.mBuffer
41    SLuint32 mAvail;        ///< Number of available bytes in the current buffer
42    float mGains[STEREO_CHANNELS]; ///< Copied from CAudioPlayer::mGains
43    SLuint32 mFramesMixed;  ///< Number of sample frames mixed from track; reset periodically
44} Track;
45
46extern SLresult IOutputMixExt_checkAudioPlayerSourceSink(CAudioPlayer *thiz);
47extern void audioPlayerGainUpdate(CAudioPlayer *thiz);
48extern void IOutputMixExt_FillBuffer(SLOutputMixExtItf self, void *pBuffer, SLuint32 size);
49