Merge "Support float data on aaudio legacy record fast path." into tm-dev am: 0ea7ae4b

        setFormat(AUDIO_FORMAT_PCM_FLOAT);

    }

    // Maybe change device format to get a FAST path.

    // AudioRecord does not support FAST mode for FLOAT data.

    // TODO AudioRecord should allow FLOAT data paths for FAST tracks.

    // So IF the user asks for low latency FLOAT

    // AND the sampleRate is likely to be compatible with FAST

    // THEN request I16 and convert to FLOAT when passing to user.

    // Note that hard coding 48000 Hz is not ideal because the sampleRate

    // for a FAST path might not be 48000 Hz.

    // It normally is but there is a chance that it is not.

    // And there is no reliable way to know that in advance.

    // Luckily the consequences of a wrong guess are minor.

    // We just may not get a FAST track.

    // But we wouldn't have anyway without this hack.

    constexpr int32_t kMostLikelySampleRateForFast = 48000;

    if (getFormat() == AUDIO_FORMAT_PCM_FLOAT

            && perfMode == AAUDIO_PERFORMANCE_MODE_LOW_LATENCY

            && (audio_channel_count_from_in_mask(channelMask) <= 2) // FAST only for mono and stereo

            && (getSampleRate() == kMostLikelySampleRateForFast

                || getSampleRate() == AAUDIO_UNSPECIFIED)) {

        setDeviceFormat(AUDIO_FORMAT_PCM_16_BIT);

    } else {

    setDeviceFormat(getFormat());

    }

    // To avoid glitching, let AudioFlinger pick the optimal burst size.

    uint32_t notificationFrames = 0;