Re: [pulseaudio-discuss] Pulseaudio Mixing & DSP Mixing

2009-12-24 Thread Lennart Poettering
On Thu, 24.12.09 19:34, tieg (tie...@access-company.com) wrote: > Is it possible to add "virtual stream" concept in PulseAudio? Although > the real data does not pass through it, PulseAudio can still be > responsible for all kinds of audio stream control. As Coling pointed out we plan to support

Re: [pulseaudio-discuss] Pulseaudio Mixing & DSP Mixing

2009-12-24 Thread Colin Guthrie
'Twas brillig, and tieg at 24/12/09 11:34 did gyre and gimble: > I agree with Pierre's opinion. > > One embedded environment, the audio is more complicated than Desktop PC. > Because there will be DSP, and there is more audio devices. > > DSP can be a pure channel for handling compressed streams,

Re: [pulseaudio-discuss] Pulseaudio Mixing & DSP Mixing

2009-12-24 Thread tieg
I agree with Pierre's opinion. One embedded environment, the audio is more complicated than Desktop PC. Because there will be DSP, and there is more audio devices. DSP can be a pure channel for handling compressed streams, and audio data just bypass PulseAudio & ALSA. For power saving and perform

Re: [pulseaudio-discuss] Pulseaudio Mixing & DSP Mixing

2009-12-23 Thread pl bossart
I also don't think mixing PCM streams in hw would bring much added value. However the initial post mentioned that the DSP can handle decoders as well. That's a completely different story. If you have compressed streams, you could benefit from offloading the decompression and mix to the DSP. The pr

Re: [pulseaudio-discuss] Pulseaudio Mixing & DSP Mixing

2009-12-23 Thread Marc-André Lureau
Hi On Wed, Dec 23, 2009 at 3:49 PM, Lennart Poettering wrote: > On Wed, 23.12.09 14:04, tieg (tie...@access-company.com) wrote: > > That said, I am quite sure that hw mixing is not particularly useful > on desktops. It has some validity however in embedded environments. > On the N900, mixing alm

Re: [pulseaudio-discuss] Pulseaudio Mixing & DSP Mixing

2009-12-23 Thread Lennart Poettering
On Wed, 23.12.09 14:04, tieg (tie...@access-company.com) wrote: > Recently, I am considering to port pulseaudio to TI OMAP 3430. However, > pulseaudio framework does not take DSP solution into consideration. It > is trouble for me to decide mixing with DSP or pulseaudio. If with DSP, > pulseaudio

Re: [pulseaudio-discuss] Pulseaudio Mixing & DSP Mixing

2009-12-23 Thread Jason Newton
On 12/22/2009 10:04 PM, tieg wrote: > Recently, I am considering to port pulseaudio to TI OMAP 3430. However, > pulseaudio framework does not take DSP solution into consideration. It > is trouble for me to decide mixing with DSP or pulseaudio. If with DSP, > pulseaudio seems nonsense. If with pulse

[pulseaudio-discuss] Pulseaudio Mixing & DSP Mixing

2009-12-22 Thread tieg
Many people has ever suspect on pulseaudio software mixing. If you have hardware mixing why using software mixing. Lennart argue that "hardware mixing is a thing of the past, modern soundcards don't do it anymore", and modern CPU with necessary SIMD commands is the trend to solve mixing performance