The patch number 11395 was added via Mauro Carvalho Chehab <mche...@redhat.com>
to http://linuxtv.org/hg/v4l-dvb master development tree.
Kernel patches in this development tree may be modified to be backward
compatible with older kernels. Compatibility modifications will be
removed before inclusion into the mainstream Kernel
If anyone has any objections, please let us know by sending a message to:
Linux Media Mailing List <linux-me...@vger.kernel.org>
------
From: Marton Balint <c...@fazekas.hu>
cx88: audio thread: if stereo detection is hw supported don't do it manually
The sole purpose of the audio thread is to detect if stereo transmission is
available, and if it is, then switch to stereo mode (and switch back, if it's
no longer available). This manual autodetection is useful for some audio
standards (e.g. A2) where cx88_get_stereo CAN detect stereo sound, but the
cx2388x chip CANNOT auto-detect stereo sound.
However, for other audio standards, the cx2388x chip CAN auto-detect the stereo
sound, so the manual autodetection in the audio thread is not needed. In fact,
it can cause serious problems because for some of these audio standards,
cx88_get_stereo CANNOT detect the presence of stereo sound. Besides that, if
the hardware automatically detects stereo/mono sound, you cannot set
core->audiomode_current to the real current audio mode on channel change.
With this patch, the manual autodetection is only used if audiomode_current is
known after a channel change (because of the initial mono mode), and
hardware-based stereo autodetecion is not applicable for the current audio
standard.
Priority: normal
Signed-off-by: Marton Balint <c...@fazekas.hu>
Signed-off-by: Mauro Carvalho Chehab <mche...@redhat.com>
---
linux/drivers/media/video/cx88/cx88-tvaudio.c | 51 +++++++++++-------
1 file changed, 33 insertions(+), 18 deletions(-)
diff -r 0eba67ef42ba -r 21bb42e0a067
linux/drivers/media/video/cx88/cx88-tvaudio.c
--- a/linux/drivers/media/video/cx88/cx88-tvaudio.c Tue Mar 31 22:01:51
2009 +0000
+++ b/linux/drivers/media/video/cx88/cx88-tvaudio.c Tue Mar 31 22:01:52
2009 +0000
@@ -998,24 +998,39 @@ int cx88_audio_thread(void *data)
break;
try_to_freeze();
- /* just monitor the audio status for now ... */
- memset(&t, 0, sizeof(t));
- cx88_get_stereo(core, &t);
-
- if (UNSET != core->audiomode_manual)
- /* manually set, don't do anything. */
- continue;
-
- /* monitor signal */
- if (t.rxsubchans & V4L2_TUNER_SUB_STEREO)
- mode = V4L2_TUNER_MODE_STEREO;
- else
- mode = V4L2_TUNER_MODE_MONO;
- if (mode == core->audiomode_current)
- continue;
-
- /* automatically switch to best available mode */
- cx88_set_stereo(core, mode, 0);
+ switch (core->tvaudio) {
+ case WW_BG:
+ case WW_DK:
+ case WW_M:
+ case WW_I:
+ case WW_L:
+ if (core->use_nicam)
+ goto hw_autodetect;
+
+ /* just monitor the audio status for now ... */
+ memset(&t, 0, sizeof(t));
+ cx88_get_stereo(core, &t);
+
+ if (UNSET != core->audiomode_manual)
+ /* manually set, don't do anything. */
+ continue;
+
+ /* monitor signal and set stereo if available */
+ if (t.rxsubchans & V4L2_TUNER_SUB_STEREO)
+ mode = V4L2_TUNER_MODE_STEREO;
+ else
+ mode = V4L2_TUNER_MODE_MONO;
+ if (mode == core->audiomode_current)
+ continue;
+ /* automatically switch to best available mode */
+ cx88_set_stereo(core, mode, 0);
+ break;
+ default:
+hw_autodetect:
+ /* stereo autodetection is supported by hardware so
+ we don't need to do it manually. Do nothing. */
+ break;
+ }
}
dprintk("cx88: tvaudio thread exiting\n");
---
Patch is available at:
http://linuxtv.org/hg/v4l-dvb/rev/21bb42e0a067fe7710a5334e92c3d70698568734
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