V4L/DVB (6828): cx88-blackbird: audio improvements
This patch should fix the 'muted audio' and 'raspy audio' problem for
mpeg2 streams out of cx88-blackbird devices.
Especially mythtv users would find that the audio would often sound bad
(aliased, or 'raspy'), mainly related to channel changes, many (all?)
other users would find that there was no audio at all in the mpeg data
from the encoder chip, unless the audio was manually unmuted.
The patch includes the following modifications:
Don't actually start the mpeg2 encoder until the device is read from
by the application.
Wait until the audio is stable for at least 400ms before starting the
mpeg encoder.
Mute/Unmute the audio when starting/stopping the mpeg encoder.
Stop the mpeg encoder when changing parameters and when changing tuner
frequency.
Add a variable 'mpeg_active' to struct cx8802_dev to allow tracking of
whether or not the mpeg2 encoder is active.
Load the firmware on cx88-blackbird driver load.
Signed-off-by: Jelle Foks <jelle@foks.8m.com>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/cx88/cx88-blackbird.c b/drivers/media/video/cx88/cx88-blackbird.c
index f802b56..7ce37f4 100644
--- a/drivers/media/video/cx88/cx88-blackbird.c
+++ b/drivers/media/video/cx88/cx88-blackbird.c
@@ -536,6 +536,9 @@
dprintk(1,"Initialize codec\n");
retval = blackbird_api_cmd(dev, CX2341X_ENC_PING_FW, 0, 0); /* ping */
if (retval < 0) {
+
+ dev->mpeg_active = 0;
+
/* ping was not successful, reset and upload firmware */
cx_write(MO_SRST_IO, 0); /* SYS_RSTO=0 */
msleep(1);
@@ -572,38 +575,80 @@
blackbird_codec_settings(dev);
msleep(1);
- /* blackbird_api_cmd(dev, IVTV_API_ASSIGN_NUM_VSYNC_LINES, 4, 0, 0xef, 0xef);
- blackbird_api_cmd(dev, IVTV_API_ASSIGN_NUM_VSYNC_LINES, 4, 0, 0xf0, 0xf0);
- blackbird_api_cmd(dev, IVTV_API_ASSIGN_NUM_VSYNC_LINES, 4, 0, 0x180, 0x180); */
blackbird_api_cmd(dev, CX2341X_ENC_SET_NUM_VSYNC_LINES, 2, 0,
BLACKBIRD_FIELD1_SAA7115,
BLACKBIRD_FIELD2_SAA7115
);
- /* blackbird_api_cmd(dev, IVTV_API_ASSIGN_PLACEHOLDER, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0); */
blackbird_api_cmd(dev, CX2341X_ENC_SET_PLACEHOLDER, 12, 0,
BLACKBIRD_CUSTOM_EXTENSION_USR_DATA,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
- /* initialize the video input */
- blackbird_api_cmd(dev, CX2341X_ENC_INITIALIZE_INPUT, 0, 0);
-
msleep(1);
+ return 0;
+}
+
+static int blackbird_start_codec(struct file *file, void *priv)
+{
+ struct cx8802_dev *dev = ((struct cx8802_fh *)priv)->dev;
+ struct cx88_core *core = dev->core;
+ /* start capturing to the host interface */
+ u32 reg;
+
+ int i;
+ int lastchange = -1;
+ int lastval = 0;
+
+ for (i=0; (i < 10) && (i < (lastchange + 4)); i++)
+ {
+ reg = cx_read(AUD_STATUS);
+
+ dprintk(1,"AUD_STATUS:%dL: 0x%x\n", i, reg);
+ if ((reg & 0x0F) != lastval)
+ {
+ lastval = reg & 0x0F;
+ lastchange = i;
+ }
+ msleep(100);
+ }
+
+ /* unmute audio source */
+ cx_clear(AUD_VOL_CTL, (1 << 6));
blackbird_api_cmd(dev, CX2341X_ENC_MUTE_VIDEO, 1, 0, BLACKBIRD_UNMUTE);
msleep(1);
blackbird_api_cmd(dev, CX2341X_ENC_MUTE_AUDIO, 1, 0, BLACKBIRD_UNMUTE);
msleep(1);
+ blackbird_api_cmd(dev, CX2341X_ENC_REFRESH_INPUT, 0,0);
+
+ /* initialize the video input */
+ blackbird_api_cmd(dev, CX2341X_ENC_INITIALIZE_INPUT, 0, 0);
+
/* start capturing to the host interface */
- /* blackbird_api_cmd(dev, CX2341X_ENC_START_CAPTURE, 2, 0, 0, 0x13); */
blackbird_api_cmd(dev, CX2341X_ENC_START_CAPTURE, 2, 0,
BLACKBIRD_MPEG_CAPTURE,
BLACKBIRD_RAW_BITS_NONE
);
msleep(10);
- blackbird_api_cmd(dev, CX2341X_ENC_REFRESH_INPUT, 0,0);
+ dev->mpeg_active = 1;
+ return 0;
+}
+
+static int blackbird_stop_codec(struct cx8802_dev *dev)
+{
+ struct cx88_core *core = dev->core;
+
+ blackbird_api_cmd(dev, CX2341X_ENC_STOP_CAPTURE, 3, 0,
+ BLACKBIRD_END_NOW,
+ BLACKBIRD_MPEG_CAPTURE,
+ BLACKBIRD_RAW_BITS_NONE
+ );
+ /* mute audio source */
+ cx_set(AUD_VOL_CTL, (1 << 6));
+
+ dev->mpeg_active = 0;
return 0;
}
@@ -833,6 +878,10 @@
if (f->ctrl_class != V4L2_CTRL_CLASS_MPEG)
return -EINVAL;
+
+ if (dev->mpeg_active)
+ blackbird_stop_codec(dev);
+
p = dev->params;
err = cx2341x_ext_ctrls(&p, 0, f, VIDIOC_S_EXT_CTRLS);
if (!err) {
@@ -864,10 +913,9 @@
struct cx8802_dev *dev = fh->dev;
struct cx88_core *core = dev->core;
- blackbird_api_cmd(fh->dev, CX2341X_ENC_STOP_CAPTURE, 3, 0,
- BLACKBIRD_END_NOW,
- BLACKBIRD_MPEG_CAPTURE,
- BLACKBIRD_RAW_BITS_NONE);
+ if (dev->mpeg_active)
+ blackbird_stop_codec(dev);
+
cx88_set_freq (core,f);
blackbird_initialize_codec(dev);
cx88_set_scale(dev->core, dev->width, dev->height,
@@ -1073,15 +1121,11 @@
static int mpeg_release(struct inode *inode, struct file *file)
{
struct cx8802_fh *fh = file->private_data;
- struct cx8802_dev *dev = NULL;
+ struct cx8802_dev *dev = fh->dev;
struct cx8802_driver *drv = NULL;
- /* blackbird_api_cmd(fh->dev, CX2341X_ENC_STOP_CAPTURE, 3, 0, BLACKBIRD_END_NOW, 0, 0x13); */
- blackbird_api_cmd(fh->dev, CX2341X_ENC_STOP_CAPTURE, 3, 0,
- BLACKBIRD_END_NOW,
- BLACKBIRD_MPEG_CAPTURE,
- BLACKBIRD_RAW_BITS_NONE
- );
+ if (dev->mpeg_active)
+ blackbird_stop_codec(dev);
cx8802_cancel_buffers(fh->dev);
/* stop mpeg capture */
@@ -1107,6 +1151,10 @@
mpeg_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
{
struct cx8802_fh *fh = file->private_data;
+ struct cx8802_dev *dev = fh->dev;
+
+ if (!dev->mpeg_active)
+ blackbird_start_codec(file, fh);
return videobuf_read_stream(&fh->mpegq, data, count, ppos, 0,
file->f_flags & O_NONBLOCK);
@@ -1282,6 +1330,7 @@
core->name);
host_setup(dev->core);
+ blackbird_initialize_codec(dev);
blackbird_register_video(dev);
/* initial device configuration: needed ? */
diff --git a/drivers/media/video/cx88/cx88.h b/drivers/media/video/cx88/cx88.h
index bb1036a..f10d432 100644
--- a/drivers/media/video/cx88/cx88.h
+++ b/drivers/media/video/cx88/cx88.h
@@ -461,6 +461,7 @@
u32 mailbox;
int width;
int height;
+ unsigned char mpeg_active; /* nonzero if mpeg encoder is active */
/* mpeg params */
struct cx2341x_mpeg_params params;