ssize_t AudioStreamOutSink::negotiate(const NBAIO_Format offers[], size_t numOffers,
NBAIO_Format counterOffers[], size_t& numCounterOffers)
{
if (mFormat == Format_Invalid) {
mStreamBufferSizeBytes = mStream->common.get_buffer_size(&mStream->common);
audio_format_t streamFormat = mStream->common.get_format(&mStream->common);
if (streamFormat == AUDIO_FORMAT_PCM_16_BIT) {
uint32_t sampleRate = mStream->common.get_sample_rate(&mStream->common);
audio_channel_mask_t channelMask =
(audio_channel_mask_t) mStream->common.get_channels(&mStream->common);
mFormat = Format_from_SR_C(sampleRate, popcount(channelMask));
mBitShift = Format_frameBitShift(mFormat);
}
}
return NBAIO_Sink::negotiate(offers, numOffers, counterOffers, numCounterOffers);
}
SourceAudioBufferProvider::SourceAudioBufferProvider(const sp<NBAIO_Source>& source) :
mSource(source),
// mFrameBitShiftFormat below
mAllocated(NULL), mSize(0), mOffset(0), mRemaining(0), mGetCount(0)
{
ALOG_ASSERT(source != 0);
// negotiate with source
NBAIO_Format counterOffers[1];
size_t numCounterOffers = 1;
ssize_t index = source->negotiate(NULL, 0, counterOffers, numCounterOffers);
ALOG_ASSERT(index == (ssize_t) NEGOTIATE && numCounterOffers > 0);
numCounterOffers = 0;
index = source->negotiate(counterOffers, 1, NULL, numCounterOffers);
ALOG_ASSERT(index == 0);
mFrameBitShift = Format_frameBitShift(source->format());
}
