Here is the fix for using the 32kHz sampling rate for TV and FM radio (ALSA).
The TV uses 32kHz anyway (mode 0; 32kHz demdec on), radio works only with
32kHz (mode 1; 32kHz baseband). The ALSA wrongly reported 32kHz and 48kHz for
everything (TV, radio, LINE1/2).
Now it should be possible to just use the card without the need to change the
capture rate from 48kHz to 32kHz. Enjoy :-)
Signed-off-by: Oldřich Jedlička <oldium.pro@xxxxxxxxx>
---
diff -r dba0b6fae413 linux/drivers/media/video/saa7134/saa7134-alsa.c
--- a/linux/drivers/media/video/saa7134/saa7134-alsa.c Thu Apr 09 08:21:42
2009 -0300
+++ b/linux/drivers/media/video/saa7134/saa7134-alsa.c Mon Apr 13 23:07:22
2009 +0200
@@ -465,6 +465,29 @@
.periods_max = 1024,
};
+static struct snd_pcm_hardware snd_card_saa7134_capture_32kHz_only =
+{
+ .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_BLOCK_TRANSFER |
+ SNDRV_PCM_INFO_MMAP_VALID),
+ .formats = SNDRV_PCM_FMTBIT_S16_LE | \
+ SNDRV_PCM_FMTBIT_S16_BE | \
+ SNDRV_PCM_FMTBIT_S8 | \
+ SNDRV_PCM_FMTBIT_U8 | \
+ SNDRV_PCM_FMTBIT_U16_LE | \
+ SNDRV_PCM_FMTBIT_U16_BE,
+ .rates = SNDRV_PCM_RATE_32000,
+ .rate_min = 32000,
+ .rate_max = 32000,
+ .channels_min = 1,
+ .channels_max = 2,
+ .buffer_bytes_max = (256*1024),
+ .period_bytes_min = 64,
+ .period_bytes_max = (256*1024),
+ .periods_min = 4,
+ .periods_max = 1024,
+};
+
static void snd_card_saa7134_runtime_free(struct snd_pcm_runtime *runtime)
{
snd_card_saa7134_pcm_t *pcm = runtime->private_data;
@@ -651,7 +674,13 @@
pcm->substream = substream;
runtime->private_data = pcm;
runtime->private_free = snd_card_saa7134_runtime_free;
- runtime->hw = snd_card_saa7134_capture;
+
+ if (amux == TV || &card(dev).radio == dev->input) {
+ /* TV uses 32kHz sampling, AM/FM radio is locked to 32kHz */
+ runtime->hw = snd_card_saa7134_capture_32kHz_only;
+ } else {
+ runtime->hw = snd_card_saa7134_capture;
+ }
if (dev->ctl_mute != 0) {
saa7134->mute_was_on = 1;
--
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