X-Git-Url: https://sigrok.org/gitweb/?a=blobdiff_plain;f=src%2Foutput%2Fwav.c;h=b266b203275fec65e9e4bf3f4215aba981ba2022;hb=c1634386178730fa7b3814272c49cb89d55a0766;hp=8aa787bd3f14e36f67fc7a58e870b20c98762fc2;hpb=364859ac732fadddada2d1622dfec7f2ba2fef76;p=libsigrok.git

diff --git a/src/output/wav.c b/src/output/wav.c
index 8aa787bd..b266b203 100644
--- a/src/output/wav.c
+++ b/src/output/wav.c
@@ -17,8 +17,9 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <config.h>
 #include <string.h>
-#include "libsigrok.h"
+#include <libsigrok/libsigrok.h>
 #include "libsigrok-internal.h"
 
 #define LOG_PREFIX "output/wav"
@@ -27,6 +28,7 @@
 #define MIN_DATA_CHUNK_SAMPLES 10
 
 struct out_context {
+	double scale;
 	gboolean header_done;
 	uint64_t samplerate;
 	int num_channels;
@@ -34,6 +36,7 @@ struct out_context {
 	int chanbuf_size;
 	int *chanbuf_used;
 	uint8_t **chanbuf;
+	float *fdata;
 };
 
 static int realloc_chanbufs(const struct sr_output *o, int size)
@@ -91,10 +94,9 @@ static int init(struct sr_output *o, GHashTable *options)
 	struct sr_channel *ch;
 	GSList *l;
 
-	(void)options;
-
 	outc = g_malloc0(sizeof(struct out_context));
 	o->priv = outc;
+	outc->scale = g_variant_get_double(g_hash_table_lookup(options, "scale"));
 
 	for (l = o->sdi->channels; l; l = l->next) {
 		ch = l->data;
@@ -229,6 +231,7 @@ static int check_chanbuf_size(const struct sr_output *o)
 
 	return size;
 }
+
 static int receive(const struct sr_output *o, const struct sr_datafeed_packet *packet,
 		GString **out)
 {
@@ -238,7 +241,10 @@ static int receive(const struct sr_output *o, const struct sr_datafeed_packet *p
 	const struct sr_config *src;
 	struct sr_channel *ch;
 	GSList *l;
-	int num_channels, size, *chan_idx, idx, i, j;
+	const GSList *channels;
+	float f;
+	int num_channels, num_samples, size, *chan_idx, idx, i, j, ret;
+	float *data;
 	uint8_t *buf;
 
 	*out = NULL;
@@ -263,17 +269,26 @@ static int receive(const struct sr_output *o, const struct sr_datafeed_packet *p
 			*out = g_string_sized_new(512);
 
 		analog = packet->payload;
-		if (analog->num_samples == 0)
+		num_samples = analog->num_samples;
+		channels = analog->meaning->channels;
+		num_channels = g_slist_length(analog->meaning->channels);
+		if (!(data = g_try_realloc(outc->fdata, sizeof(float) * num_samples * num_channels)))
+			return SR_ERR_MALLOC;
+		outc->fdata = data;
+		ret = sr_analog_to_float(analog, data);
+		if (ret != SR_OK)
+			return ret;
+
+		if (num_samples == 0)
 			return SR_OK;
 
-		num_channels = g_slist_length(analog->channels);
 		if (num_channels > outc->num_channels) {
 			sr_err("Packet has %d channels, but only %d were enabled.",
 					num_channels, outc->num_channels);
 			return SR_ERR;
 		}
 
-		if (analog->num_samples > outc->chanbuf_size) {
+		if (num_samples > outc->chanbuf_size) {
 			if (realloc_chanbufs(o, analog->num_samples) != SR_OK)
 				return SR_ERR_MALLOC;
 		}
@@ -281,15 +296,18 @@ static int receive(const struct sr_output *o, const struct sr_datafeed_packet *p
 		/* Index the channels in this packet, so we can interleave quicker. */
 		chan_idx = g_malloc(sizeof(int) * outc->num_channels);
 		for (i = 0; i < num_channels; i++) {
-			ch = g_slist_nth_data(analog->channels, i);
+			ch = g_slist_nth_data((GSList *) channels, i);
 			chan_idx[i] = g_slist_index(outc->channels, ch);
 		}
 
-		for (i = 0; i < analog->num_samples; i++) {
+		for (i = 0; i < num_samples; i++) {
 			for (j = 0; j < num_channels; j++) {
 				idx = chan_idx[j];
 				buf = outc->chanbuf[idx] + outc->chanbuf_used[idx]++ * 4;
-				float_to_le(buf, analog->data[i * num_channels + j]);
+				f = data[i * num_channels + j];
+				if (outc->scale != 0.0)
+					f /= outc->scale;
+				float_to_le(buf, f);
 			}
 		}
 		g_free(chan_idx);
@@ -312,6 +330,19 @@ static int receive(const struct sr_output *o, const struct sr_datafeed_packet *p
 	return SR_OK;
 }
 
+static struct sr_option options[] = {
+	{ "scale", "Scale", "Scale values by factor", NULL, NULL },
+	ALL_ZERO
+};
+
+static const struct sr_option *get_options(void)
+{
+	if (!options[0].def)
+		options[0].def = g_variant_ref_sink(g_variant_new_double(0.0));
+
+	return options;
+}
+
 static int cleanup(struct sr_output *o)
 {
 	struct out_context *outc;
@@ -319,10 +350,12 @@ static int cleanup(struct sr_output *o)
 
 	outc = o->priv;
 	g_slist_free(outc->channels);
+	g_variant_unref(options[0].def);
 	for (i = 0; i < outc->num_channels; i++)
 		g_free(outc->chanbuf[i]);
 	g_free(outc->chanbuf_used);
 	g_free(outc->chanbuf);
+	g_free(outc->fdata);
 	g_free(outc);
 	o->priv = NULL;
 
@@ -332,9 +365,11 @@ static int cleanup(struct sr_output *o)
 SR_PRIV struct sr_output_module output_wav = {
 	.id = "wav",
 	.name = "WAV",
-	.desc = "WAVE file format",
+	.desc = "Microsoft WAV file format",
+	.exts = (const char*[]){"wav", NULL},
+	.flags = 0,
+	.options = get_options,
 	.init = init,
 	.receive = receive,
 	.cleanup = cleanup,
 };
-