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authorMarton Balint <cus@fazekas.hu>2009-03-31 19:01:52 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-06-16 19:14:18 -0300
commit083d6f8c81e9a2bd5f71633fb38acda35fb8240c (patch)
treeb0fcd81a333b89d8a2b30b1cd049a1877fb8807c /drivers/media/video
parente878cf3a47a5d99635edc564423a9a4469c17810 (diff)
V4L/DVB (11395): 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. Signed-off-by: Marton Balint <cus@fazekas.hu> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video')
-rw-r--r--drivers/media/video/cx88/cx88-tvaudio.c51
1 files changed, 33 insertions, 18 deletions
diff --git a/drivers/media/video/cx88/cx88-tvaudio.c b/drivers/media/video/cx88/cx88-tvaudio.c
index f9501eb8557..0a8699fa729 100644
--- a/drivers/media/video/cx88/cx88-tvaudio.c
+++ b/drivers/media/video/cx88/cx88-tvaudio.c
@@ -976,24 +976,39 @@ 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");