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output/sles: support floating point samples

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According to https://developer.android.com/ndk/guides/audio/opensl/android-extensions

This feature was mentioned in https://github.com/MusicPlayerDaemon/MPD/issues/922
This commit is contained in:
Max Kellermann
2020-07-20 14:46:24 +02:00
parent 64a1386eb6
commit 448b397cb8
2 changed files with 15 additions and 2 deletions
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15
src/output/plugins/sles/SlesOutputPlugin.cxx
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@@ -173,12 +173,12 @@ SlesOutput::Open(AudioFormat &audio_format)
if (audio_format.channels > 2)
audio_format.channels = 1;
SLDataFormat_PCM format_pcm;
SLAndroidDataFormat_PCM_EX format_pcm;
format_pcm.formatType = SL_DATAFORMAT_PCM;
format_pcm.numChannels = audio_format.channels;
/* from the Android NDK docs: "Note that the field samplesPerSec is
actually in units of milliHz, despite the misleading name." */
format_pcm.samplesPerSec = audio_format.sample_rate * 1000u;
format_pcm.sampleRate = audio_format.sample_rate * 1000u;
format_pcm.bitsPerSample = SL_PCMSAMPLEFORMAT_FIXED_16;
format_pcm.containerSize = SL_PCMSAMPLEFORMAT_FIXED_16;
format_pcm.channelMask = audio_format.channels == 1
@@ -187,6 +187,7 @@ SlesOutput::Open(AudioFormat &audio_format)
format_pcm.endianness = IsLittleEndian()
? SL_BYTEORDER_LITTLEENDIAN
: SL_BYTEORDER_BIGENDIAN;
format_pcm.representation = SL_ANDROID_PCM_REPRESENTATION_SIGNED_INT;
switch (audio_format.format) {
/* note: Android doesn't support
@@ -201,6 +202,16 @@ SlesOutput::Open(AudioFormat &audio_format)
bit */
break;
case SampleFormat::FLOAT:
/* Android has an OpenSLES extension for floating
point samples:
https://developer.android.com/ndk/guides/audio/opensl/android-extensions */
format_pcm.formatType = SL_ANDROID_DATAFORMAT_PCM_EX;
format_pcm.bitsPerSample = format_pcm.containerSize =
SL_PCMSAMPLEFORMAT_FIXED_32;
format_pcm.representation = SL_ANDROID_PCM_REPRESENTATION_FLOAT;
break;
default:
/* fall back to 16 bit */
audio_format.format = SampleFormat::S16;