audio_channel_in/out_mask_from_count

and avoid ambiguous term "channels" where it might be confusing
as to whether it is a channel mask or channel count

Change-Id: I744fa08ccb6001a98c97bd638d2c9d56836c4234

Author: gkasten

cmds/stagefright/SimplePlayer.cpp

@@ -583,8 +583,7 @@ status_t SimplePlayer::onOutputFormatChanged(
                 AUDIO_STREAM_MUSIC,
                 sampleRate,
                 AUDIO_FORMAT_PCM_16_BIT,
-                (channelCount == 1)
-                    ? AUDIO_CHANNEL_OUT_MONO : AUDIO_CHANNEL_OUT_STEREO,
+                audio_channel_out_mask_from_count(channelCount),
                 0);
 
         state->mNumFramesWritten = 0;

cmds/stagefright/audioloop.cpp

@@ -32,9 +32,7 @@ int main() {
     sp<MediaSource> source = new AudioSource(
             AUDIO_SOURCE_DEFAULT,
             kSampleRate,
-            kNumChannels == 1
-                ? AUDIO_CHANNEL_IN_MONO
-                : AUDIO_CHANNEL_IN_STEREO);
+            audio_channel_in_mask_from_count(kNumChannels));
 #endif
 
     sp<MetaData> meta = new MetaData;

media/libaah_rtp/aah_decoder_pump.cpp

@@ -105,9 +105,8 @@ void AAH_DecoderPump::queueToRenderer(MediaBuffer* decoded_sample) {
                 AudioTrack::getMinFrameCount(&frameCount,
                         AUDIO_STREAM_DEFAULT,
                         static_cast<int>(format_sample_rate_));
-                int ch_format = (format_channels_ == 1)
-                    ? AUDIO_CHANNEL_OUT_MONO
-                    : AUDIO_CHANNEL_OUT_STEREO;
+                audio_channel_mask_t ch_format =
+                        audio_channel_out_mask_from_count(format_channels_);
 
                 res = renderer_->set(AUDIO_STREAM_DEFAULT,
                         format_sample_rate_,

media/libaah_rtp/aah_decoder_pump.h

@@ -75,7 +75,7 @@ class AAH_DecoderPump : public MediaSource {
     void stopAndCleanupRenderer();
 
     sp<MetaData>        format_;
-    int32_t             format_channels_;
+    int32_t             format_channels_;   // channel count, not channel mask
     int32_t             format_sample_rate_;
 
     sp<MediaSource>     decoder_;

media/libeffects/preprocessing/PreProcessing.cpp

@@ -956,10 +956,9 @@ void Session_GetConfig(preproc_session_t *session, effect_config_t *config)
     memset(config, 0, sizeof(effect_config_t));
     config->inputCfg.samplingRate = config->outputCfg.samplingRate = session->samplingRate;
     config->inputCfg.format = config->outputCfg.format = AUDIO_FORMAT_PCM_16_BIT;
-    config->inputCfg.channels = session->inChannelCount == 1 ?
-                                    AUDIO_CHANNEL_IN_MONO : AUDIO_CHANNEL_IN_STEREO;
-    config->outputCfg.channels = session->outChannelCount == 1 ?
-                                    AUDIO_CHANNEL_IN_MONO : AUDIO_CHANNEL_IN_STEREO;
+    config->inputCfg.channels = audio_channel_in_mask_from_count(session->inChannelCount);
+    // "out" doesn't mean output device, so this is the correct API to convert channel count to mask
+    config->outputCfg.channels = audio_channel_in_mask_from_count(session->outChannelCount);
     config->inputCfg.mask = config->outputCfg.mask =
             (EFFECT_CONFIG_SMP_RATE | EFFECT_CONFIG_CHANNELS | EFFECT_CONFIG_FORMAT);
 }
@@ -999,7 +998,7 @@ void Session_GetReverseConfig(preproc_session_t *session, effect_config_t *confi
     config->inputCfg.samplingRate = config->outputCfg.samplingRate = session->samplingRate;
     config->inputCfg.format = config->outputCfg.format = AUDIO_FORMAT_PCM_16_BIT;
     config->inputCfg.channels = config->outputCfg.channels =
-            session->revChannelCount == 1 ? AUDIO_CHANNEL_IN_MONO : AUDIO_CHANNEL_IN_STEREO;
+            audio_channel_in_mask_from_count(session->revChannelCount);
     config->inputCfg.mask = config->outputCfg.mask =
             (EFFECT_CONFIG_SMP_RATE | EFFECT_CONFIG_CHANNELS | EFFECT_CONFIG_FORMAT);
 }

media/libmedia/JetPlayer.cpp

@@ -92,7 +92,7 @@ int JetPlayer::init()
     mAudioTrack->set(AUDIO_STREAM_MUSIC,  //TODO parametrize this
             pLibConfig->sampleRate,
             AUDIO_FORMAT_PCM_16_BIT,
-            (pLibConfig->numChannels == 2) ? AUDIO_CHANNEL_OUT_STEREO : AUDIO_CHANNEL_OUT_MONO,
+            audio_channel_out_mask_from_count(pLibConfig->numChannels),
             mTrackBufferSize,
             AUDIO_POLICY_OUTPUT_FLAG_NONE);
 

media/libmediaplayerservice/MediaPlayerService.cpp

@@ -1514,7 +1514,7 @@ status_t MediaPlayerService::AudioOutput::open(
     frameCount = (sampleRate*afFrameCount*bufferCount)/afSampleRate;
 
     if (channelMask == CHANNEL_MASK_USE_CHANNEL_ORDER) {
-        channelMask = audio_channel_mask_from_count(channelCount);
+        channelMask = audio_channel_out_mask_from_count(channelCount);
         if (0 == channelMask) {
             ALOGE("open() error, can\'t derive mask for %d audio channels", channelCount);
             return NO_INIT;

media/libstagefright/AudioPlayer.cpp

@@ -144,7 +144,7 @@ status_t AudioPlayer::start(bool sourceAlreadyStarted) {
     } else {
         // playing to an AudioTrack, set up mask if necessary
         audio_channel_mask_t audioMask = channelMask == CHANNEL_MASK_USE_CHANNEL_ORDER ?
-                audio_channel_mask_from_count(numChannels) : channelMask;
+                audio_channel_out_mask_from_count(numChannels) : channelMask;
         if (0 == audioMask) {
             return BAD_VALUE;
         }

media/libstagefright/AudioSource.cpp

@@ -47,22 +47,22 @@ static void AudioRecordCallbackFunction(int event, void *user, void *info) {
 }
 
 AudioSource::AudioSource(
-        audio_source_t inputSource, uint32_t sampleRate, uint32_t channels)
+        audio_source_t inputSource, uint32_t sampleRate, uint32_t channelCount)
     : mStarted(false),
       mSampleRate(sampleRate),
       mPrevSampleTimeUs(0),
       mNumFramesReceived(0),
       mNumClientOwnedBuffers(0) {
 
-    ALOGV("sampleRate: %d, channels: %d", sampleRate, channels);
-    CHECK(channels == 1 || channels == 2);
+    ALOGV("sampleRate: %d, channelCount: %d", sampleRate, channelCount);
+    CHECK(channelCount == 1 || channelCount == 2);
     AudioRecord::record_flags flags = (AudioRecord::record_flags)
                     (AudioRecord::RECORD_AGC_ENABLE |
                      AudioRecord::RECORD_NS_ENABLE  |
                      AudioRecord::RECORD_IIR_ENABLE);
     mRecord = new AudioRecord(
                 inputSource, sampleRate, AUDIO_FORMAT_PCM_16_BIT,
-                channels > 1? AUDIO_CHANNEL_IN_STEREO: AUDIO_CHANNEL_IN_MONO,
+                audio_channel_in_mask_from_count(channelCount),
                 4 * kMaxBufferSize / sizeof(int16_t), /* Enable ping-pong buffers */
                 flags,
                 AudioRecordCallbackFunction,