Merge "MediaPlayer: fix channel mask handling" into tm-dev

    int32_t numChannels;

    CHECK(format->findInt32("channel-count", &numChannels));

    int32_t rawChannelMask;

    audio_channel_mask_t channelMask =

            format->findInt32("channel-mask", &rawChannelMask) ?

                    static_cast<audio_channel_mask_t>(rawChannelMask)

                    // signal to the AudioSink to derive the mask from count.

                    : CHANNEL_MASK_USE_CHANNEL_ORDER;

    // channel mask info as read from the audio format

    int32_t channelMaskFromFormat;

    // channel mask to use for native playback

    audio_channel_mask_t channelMask;

    if (format->findInt32("channel-mask", &channelMaskFromFormat)) {

        // KEY_CHANNEL_MASK follows the android.media.AudioFormat java mask

        // which is left-bitshifted by 2 relative to the native mask

        if ((channelMaskFromFormat & 0b11) != 0) {

            // received an unexpected mask (supposed to follow AudioFormat constants

            // for output masks with the 2 least-significant bits at 0), but

            // it may come from an extractor that uses native masks: keeping

            // the mask as given is ok as it contains at least mono or stereo

            // and potentially the haptic channels

            channelMask = static_cast<audio_channel_mask_t>(channelMaskFromFormat);

        } else {

            channelMask = static_cast<audio_channel_mask_t>(channelMaskFromFormat >> 2);

        }

    } else {

        // no mask found: the mask will be derived from the channel count

        channelMask = CHANNEL_MASK_USE_CHANNEL_ORDER;

    }

    int32_t sampleRate;

    CHECK(format->findInt32("sample-rate", &sampleRate));