Playback rate on MediaPlayer
Add support for modifying the playback rate of a MediaPlayer
by altering the sample rate of its AudioTrack.
The playback rate is expressed in permille, where 1000 is the
playback at normal speed.
Change-Id: I981d060ab32f7bae7a767e82c60c88ae635dceed
diff --git a/include/media/MediaPlayerInterface.h b/include/media/MediaPlayerInterface.h
index 7beb176..77c82b2 100644
--- a/include/media/MediaPlayerInterface.h
+++ b/include/media/MediaPlayerInterface.h
@@ -96,6 +96,8 @@
virtual void flush() = 0;
virtual void pause() = 0;
virtual void close() = 0;
+
+ virtual status_t setPlaybackRatePermille(int32_t rate) { return INVALID_OPERATION; }
};
MediaPlayerBase() : mCookie(0), mNotify(0) {}
diff --git a/include/media/mediaplayer.h b/include/media/mediaplayer.h
index 00b7dd5..d0b87c8 100644
--- a/include/media/mediaplayer.h
+++ b/include/media/mediaplayer.h
@@ -145,6 +145,9 @@
// audio track, or zero for error (e.g. no audio track) or unknown.
KEY_PARAMETER_AUDIO_CHANNEL_COUNT = 1200, // get only
+ // Playback rate expressed in permille (1000 is normal speed), saved as int32_t, with negative
+ // values used for rewinding or reverse playback.
+ KEY_PARAMETER_PLAYBACK_RATE_PERMILLE = 1300, // set only
};
// ----------------------------------------------------------------------------
diff --git a/include/media/stagefright/AudioPlayer.h b/include/media/stagefright/AudioPlayer.h
index 0b79324..70c47ae 100644
--- a/include/media/stagefright/AudioPlayer.h
+++ b/include/media/stagefright/AudioPlayer.h
@@ -64,6 +64,8 @@
bool isSeeking();
bool reachedEOS(status_t *finalStatus);
+ status_t setPlaybackRatePermille(int32_t ratePermille);
+
private:
friend class VideoEditorAudioPlayer;
sp<MediaSource> mSource;
diff --git a/media/libmediaplayerservice/MediaPlayerService.cpp b/media/libmediaplayerservice/MediaPlayerService.cpp
index a0c20ae..4df7f3d 100644
--- a/media/libmediaplayerservice/MediaPlayerService.cpp
+++ b/media/libmediaplayerservice/MediaPlayerService.cpp
@@ -1265,6 +1265,8 @@
mStreamType = AUDIO_STREAM_MUSIC;
mLeftVolume = 1.0;
mRightVolume = 1.0;
+ mPlaybackRatePermille = 1000;
+ mSampleRateHz = 0;
mLatency = 0;
mMsecsPerFrame = 0;
mAuxEffectId = 0;
@@ -1402,10 +1404,15 @@
ALOGV("setVolume");
t->setVolume(mLeftVolume, mRightVolume);
- mMsecsPerFrame = 1.e3 / (float) sampleRate;
+ mSampleRateHz = sampleRate;
+ mMsecsPerFrame = mPlaybackRatePermille / (float) sampleRate;
mLatency = t->latency();
mTrack = t;
+ status_t res = t->setSampleRate(mPlaybackRatePermille * mSampleRateHz / 1000);
+ if (res != NO_ERROR) {
+ return res;
+ }
t->setAuxEffectSendLevel(mSendLevel);
return t->attachAuxEffect(mAuxEffectId);;
}
@@ -1469,6 +1476,22 @@
}
}
+status_t MediaPlayerService::AudioOutput::setPlaybackRatePermille(int32_t ratePermille)
+{
+ ALOGV("setPlaybackRatePermille(%d)", ratePermille);
+ status_t res = NO_ERROR;
+ if (mTrack) {
+ res = mTrack->setSampleRate(ratePermille * mSampleRateHz / 1000);
+ } else {
+ res = NO_INIT;
+ }
+ mPlaybackRatePermille = ratePermille;
+ if (mSampleRateHz != 0) {
+ mMsecsPerFrame = mPlaybackRatePermille / (float) mSampleRateHz;
+ }
+ return res;
+}
+
status_t MediaPlayerService::AudioOutput::setAuxEffectSendLevel(float level)
{
ALOGV("setAuxEffectSendLevel(%f)", level);
diff --git a/media/libmediaplayerservice/MediaPlayerService.h b/media/libmediaplayerservice/MediaPlayerService.h
index fa71d11..52af64d 100644
--- a/media/libmediaplayerservice/MediaPlayerService.h
+++ b/media/libmediaplayerservice/MediaPlayerService.h
@@ -95,6 +95,7 @@
virtual void close();
void setAudioStreamType(audio_stream_type_t streamType) { mStreamType = streamType; }
void setVolume(float left, float right);
+ virtual status_t setPlaybackRatePermille(int32_t ratePermille);
status_t setAuxEffectSendLevel(float level);
status_t attachAuxEffect(int effectId);
virtual status_t dump(int fd, const Vector<String16>& args) const;
@@ -112,6 +113,8 @@
audio_stream_type_t mStreamType;
float mLeftVolume;
float mRightVolume;
+ int32_t mPlaybackRatePermille;
+ uint32_t mSampleRateHz; // sample rate of the content, as set in open()
float mMsecsPerFrame;
uint32_t mLatency;
int mSessionId;
@@ -152,6 +155,7 @@
virtual void close() {}
void setAudioStreamType(audio_stream_type_t streamType) {}
void setVolume(float left, float right) {}
+ virtual status_t setPlaybackRatePermille(int32_t ratePermille) { return INVALID_OPERATION; }
uint32_t sampleRate() const { return mSampleRate; }
audio_format_t format() const { return mFormat; }
size_t size() const { return mSize; }
diff --git a/media/libmediaplayerservice/StagefrightPlayer.cpp b/media/libmediaplayerservice/StagefrightPlayer.cpp
index 6d7771a..052ebf0 100644
--- a/media/libmediaplayerservice/StagefrightPlayer.cpp
+++ b/media/libmediaplayerservice/StagefrightPlayer.cpp
@@ -176,7 +176,7 @@
}
status_t StagefrightPlayer::setParameter(int key, const Parcel &request) {
- ALOGV("setParameter");
+ ALOGV("setParameter(key=%d)", key);
return mPlayer->setParameter(key, request);
}
diff --git a/media/libstagefright/AudioPlayer.cpp b/media/libstagefright/AudioPlayer.cpp
index 9a9c3ef..df27566 100644
--- a/media/libstagefright/AudioPlayer.cpp
+++ b/media/libstagefright/AudioPlayer.cpp
@@ -268,6 +268,16 @@
return mReachedEOS;
}
+status_t AudioPlayer::setPlaybackRatePermille(int32_t ratePermille) {
+ if (mAudioSink.get() != NULL) {
+ return mAudioSink->setPlaybackRatePermille(ratePermille);
+ } else if (mAudioTrack != NULL){
+ return mAudioTrack->setSampleRate(ratePermille * mSampleRate / 1000);
+ } else {
+ return NO_INIT;
+ }
+}
+
// static
size_t AudioPlayer::AudioSinkCallback(
MediaPlayerBase::AudioSink *audioSink,
diff --git a/media/libstagefright/AwesomePlayer.cpp b/media/libstagefright/AwesomePlayer.cpp
index 85b7979..70945e3 100644
--- a/media/libstagefright/AwesomePlayer.cpp
+++ b/media/libstagefright/AwesomePlayer.cpp
@@ -2251,6 +2251,14 @@
{
return setCacheStatCollectFreq(request);
}
+ case KEY_PARAMETER_PLAYBACK_RATE_PERMILLE:
+ {
+ if (mAudioPlayer != NULL) {
+ return mAudioPlayer->setPlaybackRatePermille(request.readInt32());
+ } else {
+ return NO_INIT;
+ }
+ }
default:
{
return ERROR_UNSUPPORTED;
