AudioStreamOutSink.cpp revision 2dd4bdd715f586d4d30cf90cc6fc2bbfbce60fe0 
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_TAG "AudioStreamOutSink"
18//#define LOG_NDEBUG 0
19
20#include <utils/Log.h>
21#include <media/nbaio/AudioStreamOutSink.h>
22
23namespace android {
24
25AudioStreamOutSink::AudioStreamOutSink(audio_stream_out *stream) :
26        NBAIO_Sink(),
27        mStream(stream),
28        mStreamBufferSizeBytes(0)
29{
30    ALOG_ASSERT(stream != NULL);
31}
32
33AudioStreamOutSink::~AudioStreamOutSink()
34{
35}
36
37ssize_t AudioStreamOutSink::negotiate(const NBAIO_Format offers[], size_t numOffers,
38                                      NBAIO_Format counterOffers[], size_t& numCounterOffers)
39{
40    if (mFormat == Format_Invalid) {
41        mStreamBufferSizeBytes = mStream->common.get_buffer_size(&mStream->common);
42        audio_format_t streamFormat = mStream->common.get_format(&mStream->common);
43        if (streamFormat == AUDIO_FORMAT_PCM_16_BIT) {
44            uint32_t sampleRate = mStream->common.get_sample_rate(&mStream->common);
45            audio_channel_mask_t channelMask =
46                    (audio_channel_mask_t) mStream->common.get_channels(&mStream->common);
47            mFormat = Format_from_SR_C(sampleRate, popcount(channelMask));
48            mBitShift = Format_frameBitShift(mFormat);
49        }
50    }
51    return NBAIO_Sink::negotiate(offers, numOffers, counterOffers, numCounterOffers);
52}
53
54ssize_t AudioStreamOutSink::write(const void *buffer, size_t count)
55{
56    if (!mNegotiated) {
57        return NEGOTIATE;
58    }
59    ALOG_ASSERT(mFormat != Format_Invalid);
60    ssize_t ret = mStream->write(mStream, buffer, count << mBitShift);
61    if (ret > 0) {
62        ret >>= mBitShift;
63        mFramesWritten += ret;
64    } else {
65        // FIXME verify HAL implementations are returning the correct error codes e.g. WOULD_BLOCK
66    }
67    return ret;
68}
69
70status_t AudioStreamOutSink::getNextWriteTimestamp(int64_t *timestamp) {
71    ALOG_ASSERT(timestamp != NULL);
72
73    if (NULL == mStream)
74        return INVALID_OPERATION;
75
76    if (NULL == mStream->get_next_write_timestamp)
77        return INVALID_OPERATION;
78
79    return mStream->get_next_write_timestamp(mStream, timestamp);
80}
81
82}   // namespace android
83