diff options
Diffstat (limited to 'media')
| -rw-r--r-- | media/audio/win/audio_output_win.cc | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/media/audio/win/audio_output_win.cc b/media/audio/win/audio_output_win.cc index 1ece5eb..bc8c712 100644 --- a/media/audio/win/audio_output_win.cc +++ b/media/audio/win/audio_output_win.cc @@ -88,8 +88,17 @@ namespace { // The next 3 constants are some sensible limits to prevent integer overflow // at this layer. -// TODO(cpu): Some day expand the support and API to more than stereo. -const int kMaxChannels = 2; +// Up to 6 channels can be passed to the driver. +// This should work, given the right drivers, but graceful error handling is +// needed. +// In theory 7.1 could also be supported, but it has not been tested. +// The 192 Khz constant is the frequency of quicktime lossless audio codec. +// MP4 is limited to 96 Khz, and mp3 is limited to 48 Khz. +// OGG vorbis was initially limited to 96 Khz, but recent tools are unlimited. +// 192 Khz is also the limit on most PC audio hardware. The minimum is 100 Hz. +// Humans range is 20 to 20000 Hz. Below 20 can be felt (woofer). + +const int kMaxChannels = 6; const int kMaxSampleRate = 192000; const int kMaxBitsPerSample = 64; |