Open
Description
While trying to play 24-bit/96kHz or 24-bit 192kHz files with aplay the files are downsampled to 16-bit
pi@raspberrypi ~ $ aplay -v audio/JimmyAndTheCrows96kHz.wav
Playing WAVE 'audio/JimmyAndTheCrows96kHz.wav' : Signed 24 bit Little Endian in 3bytes, Rate 96000 Hz, Stereo
Plug PCM: Rate conversion PCM (48000, sformat=S16_LE)
Converter: linear-interpolation
Protocol version: 10002
Its setup is:
stream : PLAYBACK
access : RW_INTERLEAVED
format : S24_3LE
subformat : STD
channels : 2
rate : 96000
exact rate : 96000 (96000/1)
msbits : 24
buffer_size : 32768
period_size : 8192
period_time : 85333
tstamp_mode : NONE
period_step : 1
avail_min : 8192
period_event : 0
start_threshold : 32768
stop_threshold : 32768
silence_threshold: 0
silence_size : 0
boundary : 1073741824
Slave: Hardware PCM card 0 'bcm2835 ALSA' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 48000
exact rate : 48000 (48000/1)
msbits : 16
buffer_size : 16384
period_size : 4096
period_time : 85333
tstamp_mode : NONE
period_step : 1
avail_min : 4096
period_event : 0
start_threshold : 16384
stop_threshold : 16384
silence_threshold: 0
silence_size : 0
boundary : 1073741824
appl_ptr : 0
hw_ptr : 0
pi@raspberrypi ~ $ mplayer -ao alsa audio/test32bit_44.1kHz.wav
MPlayer svn r34540 (Debian), built with gcc-4.6 (C) 2000-2012 MPlayer Team
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.
Playing audio/test32bit_44.1kHz.wav.
libavformat version 53.21.1 (external)
Mismatching header version 53.19.0
Audio only file format detected.
Load subtitles in audio/
==========================================================================
Opening audio decoder: [pcm] Uncompressed PCM audio decoder
AUDIO: 44100 Hz, 2 ch, s32le, 2822.4 kbit/100.00% (ratio: 352800->352800)
Selected audio codec: [pcm] afm: pcm (Uncompressed PCM)
==========================================================================
AO: [alsa] 44100Hz 2ch s32le (4 bytes per sample)
Video: no video
Starting playback...
A: 23.5 (23.5) of 66.0 (01:06.0) 1.8%
MPlayer interrupted by signal 2 in module: play_audio
A: 23.6 (23.5) of 66.0 (01:06.0) 1.8%
Exiting... (Quit)
pi@raspberrypi ~ $ mplayer -ao alsa audio/JimmyAndTheCrows96kHz.wav
MPlayer svn r34540 (Debian), built with gcc-4.6 (C) 2000-2012 MPlayer Team
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.
Playing audio/JimmyAndTheCrows96kHz.wav.
libavformat version 53.21.1 (external)
Mismatching header version 53.19.0
libavformat file format detected.
[wav @ 0xb63ecc78]max_analyze_duration reached
[lavf] stream 0: audio (pcm_s24le), -aid 0
Clip info:
comment: Jimmy And The Crows
encoded_by: Keith Greeninger, Chris Kee & Br
date: 2013-07-25
creation_time: 14:58:00
time_reference: 0
coding_history: A=PCM,F=96000,W=24,M=stereo,T=KORG AudioGate ver.2.3.2 (Windows 7),
artist: Keith Greeninger, Chris Kee & Brain
title: Jimmy And The Crows
Load subtitles in audio/
==========================================================================
Opening audio decoder: [pcm] Uncompressed PCM audio decoder
AUDIO: 96000 Hz, 2 ch, s24le, 4608.0 kbit/100.00% (ratio: 576000->576000)
Selected audio codec: [pcm] afm: pcm (Uncompressed PCM)
==========================================================================
AO: [alsa] 48000Hz 2ch s24le (3 bytes per sample)
Video: no video
Starting playback...
A: 36.9 (36.9) of 475.2 (07:55.2) 9.2%
MPlayer interrupted by signal 2 in module: decode_audio
A: 37.0 (36.9) of 475.2 (07:55.2) 9.2%
Exiting... (Quit)
But playing with omxplayer they "appear" to play back correctly:
pi@raspberrypi ~ $ omxplayer -p audio/JimmyAndTheCrows96kHz.wav
Audio codec pcm_s24le channels 2 samplerate 96000 bitspersample 24
Subtitle count: 0, state: off, index: 1, delay: 0
have a nice day ;)