--- /dev/null
+/*
+ * This file is part of the sigrok project.
+ *
+ * Copyright (C) 2013 Bert Vermeulen <bert@biot.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include "libsigrok.h"
+#include "libsigrok-internal.h"
+
+/* Message logging helpers with driver-specific prefix string. */
+#define DRIVER_LOG_DOMAIN "input/wav: "
+#define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
+#define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
+#define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
+#define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
+#define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
+#define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args)
+
+#define CHUNK_SIZE 4096
+
+struct context {
+ uint64_t samplerate;
+ int samplesize;
+ int num_channels;
+};
+
+static int get_wav_header(const char *filename, char *buf)
+{
+ struct stat st;
+ int fd, l;
+
+ l = strlen(filename);
+ if (l <= 4 || strcasecmp(filename + l - 4, ".wav"))
+ return SR_ERR;
+
+ if (stat(filename, &st) == -1)
+ return SR_ERR;
+ if (st.st_size <= 45)
+ /* Minimum size of header + 1 8-bit mono PCM sample. */
+ return SR_ERR;
+
+ if ((fd = open(filename, O_RDONLY)) == -1)
+ return SR_ERR;
+
+ l = read(fd, buf, 40);
+ close(fd);
+ if (l != 40)
+ return SR_ERR;
+
+ return SR_OK;
+}
+
+static int format_match(const char *filename)
+{
+ char buf[40];
+
+ if (get_wav_header(filename, buf) != SR_OK)
+ return FALSE;
+
+ if (strncmp(buf, "RIFF", 4))
+ return FALSE;
+ if (strncmp(buf + 8, "WAVE", 4))
+ return FALSE;
+ if (strncmp(buf + 12, "fmt ", 4))
+ return FALSE;
+ if (GUINT16_FROM_LE(*(uint16_t *)(buf + 20)) != 1)
+ /* Not PCM. */
+ return FALSE;
+ if (strncmp(buf + 36, "data", 4))
+ return FALSE;
+
+ return TRUE;
+}
+
+static int init(struct sr_input *in, const char *filename)
+{
+ struct sr_probe *probe;
+ struct context *ctx;
+ char buf[40], probename[8];
+ int i;
+
+ if (get_wav_header(filename, buf) != SR_OK)
+ return SR_ERR;
+
+ if (!(ctx = g_try_malloc0(sizeof(struct context))))
+ return SR_ERR_MALLOC;
+
+ /* Create a virtual device. */
+ in->sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, NULL, NULL, NULL);
+ in->sdi->priv = ctx;
+
+ ctx->samplerate = GUINT32_FROM_LE(*(uint32_t *)(buf + 24));
+ ctx->samplesize = GUINT16_FROM_LE(*(uint16_t *)(buf + 34)) / 8;
+ if (ctx->samplesize != 1 && ctx->samplesize != 2 && ctx->samplesize != 4) {
+ sr_err("only 8, 16 or 32 bits per sample supported.");
+ return SR_ERR;
+ }
+
+ if ((ctx->num_channels = GUINT16_FROM_LE(*(uint16_t *)(buf + 22))) > 20) {
+ sr_err("%d channels seems crazy.", ctx->num_channels);
+ return SR_ERR;
+ }
+
+ for (i = 0; i < ctx->num_channels; i++) {
+ snprintf(probename, 8, "CH%d", i + 1);
+ if (!(probe = sr_probe_new(0, SR_PROBE_ANALOG, TRUE, probename)))
+ return SR_ERR;
+ in->sdi->probes = g_slist_append(in->sdi->probes, probe);
+ }
+
+ return SR_OK;
+}
+
+static int loadfile(struct sr_input *in, const char *filename)
+{
+ struct sr_datafeed_packet packet;
+ struct sr_datafeed_meta meta;
+ struct sr_datafeed_analog analog;
+ struct sr_config *src;
+ struct context *ctx;
+ float fdata[CHUNK_SIZE];
+ uint64_t sample;
+ int num_samples, chunk_samples, s, c, fd, l;
+ char buf[CHUNK_SIZE];
+
+ ctx = in->sdi->priv;
+
+ /* Send header packet to the session bus. */
+ std_session_send_df_header(in->sdi, DRIVER_LOG_DOMAIN);
+
+ packet.type = SR_DF_META;
+ packet.payload = &meta;
+ src = sr_config_make(SR_CONF_SAMPLERATE, (const void *)&ctx->samplerate);
+ meta.config = g_slist_append(NULL, src);
+ sr_session_send(in->sdi, &packet);
+
+ if ((fd = open(filename, O_RDONLY)) == -1)
+ return SR_ERR;
+
+ lseek(fd, 40, SEEK_SET);
+ l = read(fd, buf, 4);
+ num_samples = GUINT32_FROM_LE((uint32_t)*(buf));
+ num_samples /= ctx->samplesize / ctx->num_channels;
+ while (TRUE) {
+ if ((l = read(fd, buf, CHUNK_SIZE)) < 1)
+ break;
+ chunk_samples = l / ctx->samplesize / ctx->num_channels;
+ for (s = 0; s < chunk_samples; s++) {
+ for (c = 0; c < ctx->num_channels; c++) {
+ sample = 0;
+ memcpy(&sample, buf + s * ctx->samplesize + c, ctx->samplesize);
+ switch (ctx->samplesize) {
+ case 1:
+ /* 8-bit PCM samples are unsigned. */
+ fdata[s + c] = (uint8_t)sample / 255.0;
+ break;
+ case 2:
+ fdata[s + c] = GINT16_FROM_LE(sample) / 32767.0;
+ break;
+ case 4:
+ fdata[s + c] = GINT32_FROM_LE(sample) / 65535.0;
+ break;
+ }
+ }
+ }
+ packet.type = SR_DF_ANALOG;
+ packet.payload = &analog;
+ analog.probes = in->sdi->probes;
+ analog.num_samples = chunk_samples;
+ analog.mq = 0;
+ analog.unit = 0;
+ analog.data = fdata;
+ sr_session_send(in->sdi, &packet);
+ }
+
+ close(fd);
+ packet.type = SR_DF_END;
+ sr_session_send(in->sdi, &packet);
+
+ return SR_OK;
+}
+
+
+SR_PRIV struct sr_input_format input_wav = {
+ .id = "wav",
+ .description = "WAV file",
+ .format_match = format_match,
+ .init = init,
+ .loadfile = loadfile,
+};
+
projects / libsigrok.git / commitdiff