[alsa-devel] [PATCH - UCM 2/2] ucm: add binary configure file parse

[Liam Girdwood]

On Tue, 2015-01-13 at 17:52 +0100, Takashi Iwai wrote:
> At Tue, 13 Jan 2015 11:00:39 +0800,
> han.lu at intel.com wrote:
> > 
> > From: "Lu, Han" <han.lu at intel.com>
> > 
> > with cset command, UCM set kcontrol parameters directly:
> >     cset "name='<KCONTROL_NAME>' 1,2<,3,...>"
> > This patch enables UCM to set kcontrol with parameters from
> > configure file:
> >     bcsetf "name='<KCONTROL_NAME>' <path/to/file>"
> > where "bcsetf" is a newly added keyword alongside of "cset", to
> > indicate binary cset with file; and <path/to/file> is the
> > configure file storing parameters in bytes array, up to 512 Bytes
> > (the maxim value that struct snd_ctl_elem_value can hold).
> 
> Why binary?  It's not portable.  You can't carry it to a different
> architecture.
> 

The intention here is that the binary data is not meant for the host but
for audio DSPs so it's just passed by UCM/ALSA as raw data.

We do have some DSP processing algos that have tuning tools where the
tool will generate a binary file of coefficients (depending on various
physical device properties etc). These coefficient files can then be
uploaded to the DSP by UCM on use case change.

Liam

> 
> Takashi
> 
> > 
> > Signed-off-by: Lu, Han <han.lu at intel.com>
> > 
> > diff --git a/src/ucm/main.c b/src/ucm/main.c
> > index 37ae4c8..1496b22 100644
> > --- a/src/ucm/main.c
> > +++ b/src/ucm/main.c
> > @@ -160,11 +160,45 @@ static int open_ctl(snd_use_case_mgr_t *uc_mgr,
> >  	return 0;
> >  }
> >  
> > +static int binary_file_parse(snd_ctl_elem_value_t *dst,
> > +			      const char *filepath)
> > +{
> > +	int err = 0;
> > +	FILE *in;
> > +	long len;
> > +	char *res;
> > +	unsigned int idx;
> > +
> > +	in = fopen(filepath, "r");
> > +	if (!in) {
> > +		err = -errno;
> > +		goto __fail;
> > +	}
> > +	fseek(in, 0L, SEEK_END);
> > +	len = ftell(in);
> > +	rewind(in);
> > +	if (len > 512)
> > +		len = 512;
> > +	res = calloc(1, (size_t)len);
> > +	if (res == NULL) {
> > +		err = -ENOMEM;
> > +		goto __fail_nomem;
> > +	}
> > +	fread(res, (size_t)len, 1, in);
> > +	for (idx = 0; idx < len; idx++)
> > +		snd_ctl_elem_value_set_byte(dst, idx, *(res + idx));
> > +	free(res);
> > +      __fail_nomem:
> > +	fclose(in);
> > +      __fail:
> > +	return err;
> > +}
> > +
> >  extern int __snd_ctl_ascii_elem_id_parse(snd_ctl_elem_id_t *dst,
> >  					 const char *str,
> >  					 const char **ret_ptr);
> >  
> > -static int execute_cset(snd_ctl_t *ctl, const char *cset)
> > +static int execute_cset(snd_ctl_t *ctl, const char *cset, int isbin)
> >  {
> >  	const char *pos;
> >  	int err;
> > @@ -194,7 +228,10 @@ static int execute_cset(snd_ctl_t *ctl, const char *cset)
> >  	err = snd_ctl_elem_info(ctl, info);
> >  	if (err < 0)
> >  		goto __fail;
> > -	err = snd_ctl_ascii_value_parse(ctl, value, info, pos);
> > +	if (isbin)
> > +		err = binary_file_parse(value, pos);
> > +	else
> > +		err = snd_ctl_ascii_value_parse(ctl, value, info, pos);
> >  	if (err < 0)
> >  		goto __fail;
> >  	err = snd_ctl_elem_write(ctl, value);
> > @@ -239,6 +276,7 @@ static int execute_sequence(snd_use_case_mgr_t *uc_mgr,
> >  				goto __fail_nomem;
> >  			break;
> >  		case SEQUENCE_ELEMENT_TYPE_CSET:
> > +		case SEQUENCE_ELEMENT_TYPE_BCSETF:
> >  			if (cdev == NULL) {
> >  				const char *cdev1 = NULL, *cdev2 = NULL;
> >  				err = get_value3(&cdev1, "PlaybackCTL",
> > @@ -274,7 +312,7 @@ static int execute_sequence(snd_use_case_mgr_t *uc_mgr,
> >  					goto __fail;
> >  				}
> >  			}
> > -			err = execute_cset(ctl, s->data.cset);
> > +			err = execute_cset(ctl, s->data.cset, s->isbin);
> >  			if (err < 0) {
> >  				uc_error("unable to execute cset '%s'\n", s->data.cset);
> >  				goto __fail;
> > diff --git a/src/ucm/parser.c b/src/ucm/parser.c
> > index d7517f6..686c883 100644
> > --- a/src/ucm/parser.c
> > +++ b/src/ucm/parser.c
> > @@ -306,6 +306,17 @@ static int parse_sequence(snd_use_case_mgr_t *uc_mgr ATTRIBUTE_UNUSED,
> >  			continue;
> >  		}
> >  
> > +		if (strcmp(cmd, "bcsetf") == 0) {
> > +			curr->type = SEQUENCE_ELEMENT_TYPE_BCSETF;
> > +			curr->isbin = 1;
> > +			err = parse_string(n, &curr->data.cset);
> > +			if (err < 0) {
> > +				uc_error("error: bcsetf requires a string!");
> > +				return err;
> > +			}
> > +			continue;
> > +		}
> > +
> >  		if (strcmp(cmd, "usleep") == 0) {
> >  			curr->type = SEQUENCE_ELEMENT_TYPE_SLEEP;
> >  			err = snd_config_get_integer(n, &curr->data.sleep);
> > diff --git a/src/ucm/ucm_local.h b/src/ucm/ucm_local.h
> > index 87f14a2..80d7335 100644
> > --- a/src/ucm/ucm_local.h
> > +++ b/src/ucm/ucm_local.h
> > @@ -47,6 +47,7 @@
> >  #define SEQUENCE_ELEMENT_TYPE_CSET	2
> >  #define SEQUENCE_ELEMENT_TYPE_SLEEP	3
> >  #define SEQUENCE_ELEMENT_TYPE_EXEC	4
> > +#define SEQUENCE_ELEMENT_TYPE_BCSETF	5
> >  
> >  struct ucm_value {
> >          struct list_head list;
> > @@ -63,6 +64,7 @@ struct sequence_element {
> >  		char *cset;
> >  		char *exec;
> >  	} data;
> > +	int isbin;          /* Indicate cset is binary array or ascii array */
> >  };
> >  
> >  /*
> > -- 
> > 2.1.0
> >