X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Ftransform%2Finvert.c;h=a3e14cb82ae701015d734d78bc270bb78023e76b;hb=f0e6b41f7a11daaef1ed0783c25768ad90b1a765;hp=14a92fb76e30791dd2a3278cfeef10803c5ef5d6;hpb=6ec6c43b4738dbc7091f4a49a4ec80ea6102cb52;p=libsigrok.git

diff --git a/src/transform/invert.c b/src/transform/invert.c
index 14a92fb7..a3e14cb8 100644
--- a/src/transform/invert.c
+++ b/src/transform/invert.c
@@ -14,8 +14,7 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
 #include <config.h>
@@ -31,12 +30,9 @@ static int receive(const struct sr_transform *t,
 {
 	const struct sr_datafeed_logic *logic;
 	const struct sr_datafeed_analog *analog;
-	struct sr_channel *ch;
-	GSList *l;
-	float *fdata, *f;
-	int si, num_channels, c;
 	uint8_t *b;
-	uint64_t i, j;
+	int64_t p;
+	uint64_t i, j, q;
 
 	if (!t || !t->sdi || !packet_in || !packet_out)
 		return SR_ERR_ARG;
@@ -54,17 +50,12 @@ static int receive(const struct sr_transform *t,
 		break;
 	case SR_DF_ANALOG:
 		analog = packet_in->payload;
-		fdata = (float *)analog->data;
-		num_channels = g_slist_length(analog->channels);
-		for (si = 0; si < analog->num_samples; si++) {
-			/* For now invert all values in all channels. */
-			for (l = analog->channels, c = 0; l; l = l->next, c++) {
-				ch = l->data;
-				(void)ch;
-				f = &fdata[si * num_channels + c];
-				*f = 1.0 / *f;
-			}
-		}
+		p = analog->encoding->scale.p;
+		q = analog->encoding->scale.q;
+		if (q > INT64_MAX)
+			return SR_ERR;
+		analog->encoding->scale.p = (p < 0) ? -q : q;
+		analog->encoding->scale.q = (p < 0) ? -p : p;
 		break;
 	default:
 		sr_spew("Unsupported packet type %d, ignoring.", packet_in->type);