This is the driver model agreed upon for all drivers.
As a result of the split, a devc->num_probes field had to be added in order to
reduce the interdependence between api.c and protocol.c .
Signed-off-by: Alexandru Gagniuc <redacted>
noinst_LTLIBRARIES = libsigrokhwalsa.la
libsigrokhwalsa_la_SOURCES = \
- alsa.c
+ protocol.h \
+ protocol.c \
+ api.c
libsigrokhwalsa_la_CFLAGS = \
-I$(top_srcdir)
+++ /dev/null
-/*
- * This file is part of the sigrok project.
- *
- * Copyright (C) 2011 Daniel Ribeiro <drwyrm@gmail.com>
- * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
- *
- * 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 2 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, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-#include <alsa/asoundlib.h>
-#include "libsigrok.h"
-#include "libsigrok-internal.h"
-
-/* Message logging helpers with driver-specific prefix string. */
-#define DRIVER_LOG_DOMAIN "alsa: "
-#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 NUM_PROBES 2
-#define SAMPLE_WIDTH 16
-#define DEFAULT_SAMPLERATE 44100
-// #define AUDIO_DEV "plughw:0,0"
-#define AUDIO_DEV "default"
-
-static const int hwcaps[] = {
- SR_HWCAP_SAMPLERATE,
- SR_HWCAP_LIMIT_SAMPLES,
- SR_HWCAP_CONTINUOUS,
- 0,
-};
-
-static const char *probe_names[] = {
- "Channel 0",
- "Channel 1",
- NULL,
-};
-
-SR_PRIV struct sr_dev_driver alsa_driver_info;
-static struct sr_dev_driver *di = &alsa_driver_info;
-
-/** Private, per-device-instance driver context. */
-struct dev_context {
- uint64_t cur_samplerate;
- uint64_t limit_samples;
- uint64_t num_samples;
- snd_pcm_t *capture_handle;
- snd_pcm_hw_params_t *hw_params;
- struct pollfd *ufds;
- void *cb_data;
-};
-
-static int clear_instances(void)
-{
- /* TODO */
-
- return SR_OK;
-}
-
-static int hw_init(struct sr_context *sr_ctx)
-{
- struct drv_context *drvc;
-
- if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
- sr_err("Driver context malloc failed.");
- return SR_ERR_MALLOC;
- }
-
- drvc->sr_ctx = sr_ctx;
- di->priv = drvc;
-
- return SR_OK;
-}
-
-static GSList *hw_scan(GSList *options)
-{
- struct drv_context *drvc;
- struct dev_context *devc;
- struct sr_dev_inst *sdi;
- struct sr_probe *probe;
- GSList *devices;
- int i;
-
- (void)options;
-
- drvc = di->priv;
- drvc->instances = NULL;
-
- devices = NULL;
-
- if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
- sr_err("Device context malloc failed.");
- return NULL;
- }
-
- if (!(sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "alsa", NULL, NULL))) {
- sr_err("Failed to create device instance.");
- return NULL;
- }
-
- /* Set the samplerate to a default value for now. */
- devc->cur_samplerate = DEFAULT_SAMPLERATE;
-
- sdi->priv = devc;
- sdi->driver = di;
-
- for (i = 0; probe_names[i]; i++) {
- if (!(probe = sr_probe_new(i, SR_PROBE_ANALOG, TRUE,
- probe_names[i]))) {
- sr_err("Failed to create probe.");
- return NULL;
- }
- sdi->probes = g_slist_append(sdi->probes, probe);
- }
-
- drvc->instances = g_slist_append(drvc->instances, sdi);
- devices = g_slist_append(devices, sdi);
-
- return devices;
-}
-
-static GSList *hw_dev_list(void)
-{
- struct drv_context *drvc;
-
- drvc = di->priv;
-
- return drvc->instances;
-}
-
-static int hw_dev_open(struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
- int ret;
-
- devc = sdi->priv;
-
- sr_dbg("Opening audio device '%s' for stream capture.", AUDIO_DEV);
- ret = snd_pcm_open(&devc->capture_handle, AUDIO_DEV,
- SND_PCM_STREAM_CAPTURE, 0);
- if (ret < 0) {
- sr_err("Can't open audio device: %s.", snd_strerror(ret));
- return SR_ERR;
- }
-
- sr_dbg("Allocating hardware parameter structure.");
- ret = snd_pcm_hw_params_malloc(&devc->hw_params);
- if (ret < 0) {
- sr_err("Can't allocate hardware parameter structure: %s.",
- snd_strerror(ret));
- return SR_ERR_MALLOC;
- }
-
- sr_dbg("Initializing hardware parameter structure.");
- ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params);
- if (ret < 0) {
- sr_err("Can't initialize hardware parameter structure: %s.",
- snd_strerror(ret));
- return SR_ERR;
- }
-
- return SR_OK;
-}
-
-static int hw_dev_close(struct sr_dev_inst *sdi)
-{
- int ret;
- struct dev_context *devc;
-
- devc = sdi->priv;
-
- sr_dbg("Closing device.");
-
- if (devc->hw_params) {
- sr_dbg("Freeing hardware parameters.");
- snd_pcm_hw_params_free(devc->hw_params);
- } else {
- sr_dbg("No hardware parameters, no need to free.");
- }
-
- if (devc->capture_handle) {
- sr_dbg("Closing PCM device.");
- if ((ret = snd_pcm_close(devc->capture_handle)) < 0) {
- sr_err("Failed to close device: %s.",
- snd_strerror(ret));
- }
- } else {
- sr_dbg("No capture handle, no need to close audio device.");
- }
-
- return SR_OK;
-}
-
-static int hw_cleanup(void)
-{
- clear_instances();
-
- return SR_OK;
-}
-
-static int hw_info_get(int info_id, const void **data,
- const struct sr_dev_inst *sdi)
-{
- struct dev_context *devc;
-
- if (info_id != SR_DI_HWCAPS) /* For SR_DI_HWCAPS sdi will be NULL. */
- devc = sdi->priv;
-
- switch (info_id) {
- case SR_DI_HWCAPS:
- *data = hwcaps;
- break;
- case SR_DI_NUM_PROBES:
- *data = GINT_TO_POINTER(NUM_PROBES);
- break;
- case SR_DI_PROBE_NAMES:
- *data = probe_names;
- break;
- case SR_DI_CUR_SAMPLERATE:
- *data = &devc->cur_samplerate;
- break;
- default:
- sr_err("Invalid info_id: %d.", info_id);
- return SR_ERR_ARG;
- }
-
- return SR_OK;
-}
-
-static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
- const void *value)
-{
- struct dev_context *devc;
-
- devc = sdi->priv;
-
- switch (hwcap) {
- case SR_HWCAP_SAMPLERATE:
- devc->cur_samplerate = *(const uint64_t *)value;
- break;
- case SR_HWCAP_LIMIT_SAMPLES:
- devc->limit_samples = *(const uint64_t *)value;
- break;
- default:
- sr_err("Unknown capability: %d.", hwcap);
- return SR_ERR;
- }
-
- return SR_OK;
-}
-
-static int receive_data(int fd, int revents, void *cb_data)
-{
- struct sr_dev_inst *sdi;
- struct dev_context *devc;
- struct sr_datafeed_packet packet;
- struct sr_datafeed_analog analog;
- char inbuf[4096];
- int i, x, count, offset, samples_to_get;
- uint16_t tmp16;
-
- (void)fd;
- (void)revents;
-
- sdi = cb_data;
- devc = sdi->priv;
-
- memset(&analog, 0, sizeof(struct sr_datafeed_analog));
- memset(inbuf, 0, sizeof(inbuf));
-
- samples_to_get = MIN(4096 / 4, devc->limit_samples);
-
- sr_spew("Getting %d samples from audio device.", samples_to_get);
- count = snd_pcm_readi(devc->capture_handle, inbuf, samples_to_get);
-
- if (count < 0) {
- sr_err("Failed to read samples: %s.", snd_strerror(count));
- return FALSE;
- } else if (count != samples_to_get) {
- sr_spew("Only got %d/%d samples.", count, samples_to_get);
- }
-
- analog.data = g_try_malloc0(count * sizeof(float) * NUM_PROBES);
- if (!analog.data) {
- sr_err("Failed to malloc sample buffer.");
- return FALSE;
- }
-
- offset = 0;
-
- for (i = 0; i < count; i++) {
- for (x = 0; x < NUM_PROBES; x++) {
- tmp16 = *(uint16_t *)(inbuf + (i * 4) + (x * 2));
- analog.data[offset++] = (float)tmp16;
- }
- }
-
- /* Send a sample packet with the analog values. */
- analog.num_samples = count;
- analog.mq = SR_MQ_VOLTAGE; /* FIXME */
- analog.unit = SR_UNIT_VOLT; /* FIXME */
- packet.type = SR_DF_ANALOG;
- packet.payload = &analog;
- sr_session_send(devc->cb_data, &packet);
-
- g_free(analog.data);
-
- devc->num_samples += count;
-
- /* Stop acquisition if we acquired enough samples. */
- if (devc->limit_samples > 0) {
- if (devc->num_samples >= devc->limit_samples) {
- sr_info("Requested number of samples reached.");
- sdi->driver->dev_acquisition_stop(sdi, cb_data);
- }
- }
-
- return TRUE;
-}
-
-static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
- void *cb_data)
-{
- struct sr_datafeed_packet packet;
- struct sr_datafeed_header header;
- struct sr_datafeed_meta_analog meta;
- struct dev_context *devc;
- int count, ret;
-
- devc = sdi->priv;
- devc->cb_data = cb_data;
-
- sr_dbg("Setting audio access type to RW/interleaved.");
- ret = snd_pcm_hw_params_set_access(devc->capture_handle,
- devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
- if (ret < 0) {
- sr_err("Can't set audio access type: %s.", snd_strerror(ret));
- return SR_ERR;
- }
-
- /* FIXME: Hardcoded for 16bits. */
- sr_dbg("Setting audio sample format to signed 16bit (little endian).");
- ret = snd_pcm_hw_params_set_format(devc->capture_handle,
- devc->hw_params, SND_PCM_FORMAT_S16_LE);
- if (ret < 0) {
- sr_err("Can't set audio sample format: %s.", snd_strerror(ret));
- return SR_ERR;
- }
-
- sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.",
- devc->cur_samplerate);
- ret = snd_pcm_hw_params_set_rate_near(devc->capture_handle,
- devc->hw_params, (unsigned int *)&devc->cur_samplerate, 0);
- if (ret < 0) {
- sr_err("Can't set audio sample rate: %s.", snd_strerror(ret));
- return SR_ERR;
- }
-
- sr_dbg("Setting audio channel count to %d.", NUM_PROBES);
- ret = snd_pcm_hw_params_set_channels(devc->capture_handle,
- devc->hw_params, NUM_PROBES);
- if (ret < 0) {
- sr_err("Can't set channel count: %s.", snd_strerror(ret));
- return SR_ERR;
- }
-
- sr_dbg("Setting audio parameters.");
- ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params);
- if (ret < 0) {
- sr_err("Can't set parameters: %s.", snd_strerror(ret));
- return SR_ERR;
- }
-
- sr_dbg("Preparing audio interface for use.");
- ret = snd_pcm_prepare(devc->capture_handle);
- if (ret < 0) {
- sr_err("Can't prepare audio interface for use: %s.",
- snd_strerror(ret));
- return SR_ERR;
- }
-
- count = snd_pcm_poll_descriptors_count(devc->capture_handle);
- if (count < 1) {
- sr_err("Unable to obtain poll descriptors count.");
- return SR_ERR;
- }
- sr_spew("Obtained poll descriptor count: %d.", count);
-
- if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
- sr_err("Failed to malloc ufds.");
- return SR_ERR_MALLOC;
- }
-
- sr_err("Getting %d poll descriptors.", count);
- ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count);
- if (ret < 0) {
- sr_err("Unable to obtain poll descriptors: %s.",
- snd_strerror(ret));
- g_free(devc->ufds);
- return SR_ERR;
- }
-
- /* Send header packet to the session bus. */
- sr_dbg("Sending SR_DF_HEADER packet.");
- packet.type = SR_DF_HEADER;
- packet.payload = (uint8_t *)&header;
- header.feed_version = 1;
- gettimeofday(&header.starttime, NULL);
- sr_session_send(devc->cb_data, &packet);
-
- /* Send metadata about the SR_DF_ANALOG packets to come. */
- sr_dbg("Sending SR_DF_META_ANALOG packet.");
- packet.type = SR_DF_META_ANALOG;
- packet.payload = &meta;
- meta.num_probes = NUM_PROBES;
- sr_session_send(devc->cb_data, &packet);
-
- /* Poll every 10ms, or whenever some data comes in. */
- sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10,
- receive_data, (void *)sdi);
-
- // g_free(devc->ufds); /* FIXME */
-
- return SR_OK;
-}
-
-static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
-{
- struct sr_datafeed_packet packet;
- struct dev_context *devc;
-
- devc = sdi->priv;
- devc->cb_data = cb_data;
-
- sr_source_remove(devc->ufds[0].fd);
-
- /* Send end packet to the session bus. */
- sr_dbg("Sending SR_DF_END packet.");
- packet.type = SR_DF_END;
- sr_session_send(cb_data, &packet);
-
- return SR_OK;
-}
-
-SR_PRIV struct sr_dev_driver alsa_driver_info = {
- .name = "alsa",
- .longname = "ALSA driver",
- .api_version = 1,
- .init = hw_init,
- .cleanup = hw_cleanup,
- .scan = hw_scan,
- .dev_list = hw_dev_list,
- .dev_clear = clear_instances,
- .dev_open = hw_dev_open,
- .dev_close = hw_dev_close,
- .info_get = hw_info_get,
- .dev_config_set = hw_dev_config_set,
- .dev_acquisition_start = hw_dev_acquisition_start,
- .dev_acquisition_stop = hw_dev_acquisition_stop,
- .priv = NULL,
-};
--- /dev/null
+/*
+ * This file is part of the sigrok project.
+ *
+ * Copyright (C) 2011 Daniel Ribeiro <drwyrm@gmail.com>
+ * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "protocol.h"
+#include "libsigrok.h"
+#include "libsigrok-internal.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+#define DEFAULT_PROBES 2
+#define SAMPLE_WIDTH 16
+#define DEFAULT_SAMPLERATE 44100
+// #define AUDIO_DEV "plughw:0,0"
+#define AUDIO_DEV "default"
+
+static const int hwcaps[] = {
+ SR_HWCAP_SAMPLERATE,
+ SR_HWCAP_LIMIT_SAMPLES,
+ SR_HWCAP_CONTINUOUS,
+ 0,
+};
+
+static const char *probe_names[] = {
+ "Channel 0",
+ "Channel 1",
+ NULL,
+};
+
+SR_PRIV struct sr_dev_driver alsa_driver_info;
+static struct sr_dev_driver *di = &alsa_driver_info;
+
+static int clear_instances(void)
+{
+ /* TODO */
+
+ return SR_OK;
+}
+
+static int hw_init(struct sr_context *sr_ctx)
+{
+ struct drv_context *drvc;
+
+ if (!(drvc = g_try_malloc0(sizeof(struct drv_context)))) {
+ sr_err("Driver context malloc failed.");
+ return SR_ERR_MALLOC;
+ }
+
+ drvc->sr_ctx = sr_ctx;
+ di->priv = drvc;
+
+ return SR_OK;
+}
+
+static GSList *hw_scan(GSList *options)
+{
+ struct drv_context *drvc;
+ struct dev_context *devc;
+ struct sr_dev_inst *sdi;
+ struct sr_probe *probe;
+ GSList *devices;
+ int i;
+
+ (void)options;
+
+ drvc = di->priv;
+ drvc->instances = NULL;
+
+ devices = NULL;
+
+ if (!(devc = g_try_malloc0(sizeof(struct dev_context)))) {
+ sr_err("Device context malloc failed.");
+ return NULL;
+ }
+
+ if (!(sdi = sr_dev_inst_new(0, SR_ST_ACTIVE, "alsa", NULL, NULL))) {
+ sr_err("Failed to create device instance.");
+ return NULL;
+ }
+
+ /* Set the samplerate to a default value for now. */
+ devc->cur_samplerate = DEFAULT_SAMPLERATE;
+ devc->num_probes = DEFAULT_PROBES;
+
+ sdi->priv = devc;
+ sdi->driver = di;
+
+ for (i = 0; probe_names[i]; i++) {
+ if (!(probe = sr_probe_new(i, SR_PROBE_ANALOG, TRUE,
+ probe_names[i]))) {
+ sr_err("Failed to create probe.");
+ return NULL;
+ }
+ sdi->probes = g_slist_append(sdi->probes, probe);
+ }
+
+ drvc->instances = g_slist_append(drvc->instances, sdi);
+ devices = g_slist_append(devices, sdi);
+
+ return devices;
+}
+
+static GSList *hw_dev_list(void)
+{
+ struct drv_context *drvc;
+
+ drvc = di->priv;
+
+ return drvc->instances;
+}
+
+static int hw_dev_open(struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+ int ret;
+
+ devc = sdi->priv;
+
+ sr_dbg("Opening audio device '%s' for stream capture.", AUDIO_DEV);
+ ret = snd_pcm_open(&devc->capture_handle, AUDIO_DEV,
+ SND_PCM_STREAM_CAPTURE, 0);
+ if (ret < 0) {
+ sr_err("Can't open audio device: %s.", snd_strerror(ret));
+ return SR_ERR;
+ }
+
+ sr_dbg("Allocating hardware parameter structure.");
+ ret = snd_pcm_hw_params_malloc(&devc->hw_params);
+ if (ret < 0) {
+ sr_err("Can't allocate hardware parameter structure: %s.",
+ snd_strerror(ret));
+ return SR_ERR_MALLOC;
+ }
+
+ sr_dbg("Initializing hardware parameter structure.");
+ ret = snd_pcm_hw_params_any(devc->capture_handle, devc->hw_params);
+ if (ret < 0) {
+ sr_err("Can't initialize hardware parameter structure: %s.",
+ snd_strerror(ret));
+ return SR_ERR;
+ }
+
+ return SR_OK;
+}
+
+static int hw_dev_close(struct sr_dev_inst *sdi)
+{
+ int ret;
+ struct dev_context *devc;
+
+ devc = sdi->priv;
+
+ sr_dbg("Closing device.");
+
+ if (devc->hw_params) {
+ sr_dbg("Freeing hardware parameters.");
+ snd_pcm_hw_params_free(devc->hw_params);
+ } else {
+ sr_dbg("No hardware parameters, no need to free.");
+ }
+
+ if (devc->capture_handle) {
+ sr_dbg("Closing PCM device.");
+ if ((ret = snd_pcm_close(devc->capture_handle)) < 0) {
+ sr_err("Failed to close device: %s.",
+ snd_strerror(ret));
+ }
+ } else {
+ sr_dbg("No capture handle, no need to close audio device.");
+ }
+
+ return SR_OK;
+}
+
+static int hw_cleanup(void)
+{
+ clear_instances();
+
+ return SR_OK;
+}
+
+static int hw_info_get(int info_id, const void **data,
+ const struct sr_dev_inst *sdi)
+{
+ struct dev_context *devc;
+
+ if (info_id != SR_DI_HWCAPS) /* For SR_DI_HWCAPS sdi will be NULL. */
+ devc = sdi->priv;
+
+ switch (info_id) {
+ case SR_DI_HWCAPS:
+ *data = hwcaps;
+ break;
+ case SR_DI_NUM_PROBES:
+ *data = GINT_TO_POINTER(DEFAULT_PROBES);
+ break;
+ case SR_DI_PROBE_NAMES:
+ *data = probe_names;
+ break;
+ case SR_DI_CUR_SAMPLERATE:
+ *data = &devc->cur_samplerate;
+ break;
+ default:
+ sr_err("Invalid info_id: %d.", info_id);
+ return SR_ERR_ARG;
+ }
+
+ return SR_OK;
+}
+
+static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
+ const void *value)
+{
+ struct dev_context *devc;
+
+ devc = sdi->priv;
+
+ switch (hwcap) {
+ case SR_HWCAP_SAMPLERATE:
+ devc->cur_samplerate = *(const uint64_t *)value;
+ break;
+ case SR_HWCAP_LIMIT_SAMPLES:
+ devc->limit_samples = *(const uint64_t *)value;
+ break;
+ default:
+ sr_err("Unknown capability: %d.", hwcap);
+ return SR_ERR;
+ }
+
+ return SR_OK;
+}
+
+static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
+ void *cb_data)
+{
+ struct sr_datafeed_packet packet;
+ struct sr_datafeed_header header;
+ struct sr_datafeed_meta_analog meta;
+ struct dev_context *devc;
+ int count, ret;
+
+ devc = sdi->priv;
+ devc->cb_data = cb_data;
+
+ sr_dbg("Setting audio access type to RW/interleaved.");
+ ret = snd_pcm_hw_params_set_access(devc->capture_handle,
+ devc->hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
+ if (ret < 0) {
+ sr_err("Can't set audio access type: %s.", snd_strerror(ret));
+ return SR_ERR;
+ }
+
+ /* FIXME: Hardcoded for 16bits. */
+ sr_dbg("Setting audio sample format to signed 16bit (little endian).");
+ ret = snd_pcm_hw_params_set_format(devc->capture_handle,
+ devc->hw_params, SND_PCM_FORMAT_S16_LE);
+ if (ret < 0) {
+ sr_err("Can't set audio sample format: %s.", snd_strerror(ret));
+ return SR_ERR;
+ }
+
+ sr_dbg("Setting audio samplerate to %" PRIu64 "Hz.",
+ devc->cur_samplerate);
+ ret = snd_pcm_hw_params_set_rate_near(devc->capture_handle,
+ devc->hw_params, (unsigned int *)&devc->cur_samplerate, 0);
+ if (ret < 0) {
+ sr_err("Can't set audio sample rate: %s.", snd_strerror(ret));
+ return SR_ERR;
+ }
+
+ sr_dbg("Setting audio channel count to %d.", devc->num_probes);
+ ret = snd_pcm_hw_params_set_channels(devc->capture_handle,
+ devc->hw_params, devc->num_probes);
+ if (ret < 0) {
+ sr_err("Can't set channel count: %s.", snd_strerror(ret));
+ return SR_ERR;
+ }
+
+ sr_dbg("Setting audio parameters.");
+ ret = snd_pcm_hw_params(devc->capture_handle, devc->hw_params);
+ if (ret < 0) {
+ sr_err("Can't set parameters: %s.", snd_strerror(ret));
+ return SR_ERR;
+ }
+
+ sr_dbg("Preparing audio interface for use.");
+ ret = snd_pcm_prepare(devc->capture_handle);
+ if (ret < 0) {
+ sr_err("Can't prepare audio interface for use: %s.",
+ snd_strerror(ret));
+ return SR_ERR;
+ }
+
+ count = snd_pcm_poll_descriptors_count(devc->capture_handle);
+ if (count < 1) {
+ sr_err("Unable to obtain poll descriptors count.");
+ return SR_ERR;
+ }
+ sr_spew("Obtained poll descriptor count: %d.", count);
+
+ if (!(devc->ufds = g_try_malloc(count * sizeof(struct pollfd)))) {
+ sr_err("Failed to malloc ufds.");
+ return SR_ERR_MALLOC;
+ }
+
+ sr_err("Getting %d poll descriptors.", count);
+ ret = snd_pcm_poll_descriptors(devc->capture_handle, devc->ufds, count);
+ if (ret < 0) {
+ sr_err("Unable to obtain poll descriptors: %s.",
+ snd_strerror(ret));
+ g_free(devc->ufds);
+ return SR_ERR;
+ }
+
+ /* Send header packet to the session bus. */
+ sr_dbg("Sending SR_DF_HEADER packet.");
+ packet.type = SR_DF_HEADER;
+ packet.payload = (uint8_t *)&header;
+ header.feed_version = 1;
+ gettimeofday(&header.starttime, NULL);
+ sr_session_send(devc->cb_data, &packet);
+
+ /* Send metadata about the SR_DF_ANALOG packets to come. */
+ sr_dbg("Sending SR_DF_META_ANALOG packet.");
+ packet.type = SR_DF_META_ANALOG;
+ packet.payload = &meta;
+ meta.num_probes = devc->num_probes;
+ sr_session_send(devc->cb_data, &packet);
+
+ /* Poll every 10ms, or whenever some data comes in. */
+ sr_source_add(devc->ufds[0].fd, devc->ufds[0].events, 10,
+ alsa_receive_data, (void *)sdi);
+
+ // g_free(devc->ufds); /* FIXME */
+
+ return SR_OK;
+}
+
+static int hw_dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
+{
+ struct sr_datafeed_packet packet;
+ struct dev_context *devc;
+
+ devc = sdi->priv;
+ devc->cb_data = cb_data;
+
+ sr_source_remove(devc->ufds[0].fd);
+
+ /* Send end packet to the session bus. */
+ sr_dbg("Sending SR_DF_END packet.");
+ packet.type = SR_DF_END;
+ sr_session_send(cb_data, &packet);
+
+ return SR_OK;
+}
+
+SR_PRIV struct sr_dev_driver alsa_driver_info = {
+ .name = "alsa",
+ .longname = "ALSA driver",
+ .api_version = 1,
+ .init = hw_init,
+ .cleanup = hw_cleanup,
+ .scan = hw_scan,
+ .dev_list = hw_dev_list,
+ .dev_clear = clear_instances,
+ .dev_open = hw_dev_open,
+ .dev_close = hw_dev_close,
+ .info_get = hw_info_get,
+ .dev_config_set = hw_dev_config_set,
+ .dev_acquisition_start = hw_dev_acquisition_start,
+ .dev_acquisition_stop = hw_dev_acquisition_stop,
+ .priv = NULL,
+};
--- /dev/null
+/*
+ * This file is part of the libsigrok project.
+ *
+ * Copyright (C) 2011 Daniel Ribeiro <drwyrm@gmail.com>
+ * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "protocol.h"
+#include "libsigrok.h"
+#include "libsigrok-internal.h"
+
+SR_PRIV int alsa_receive_data(int fd, int revents, void *cb_data)
+{
+ struct sr_dev_inst *sdi;
+ struct dev_context *devc;
+ struct sr_datafeed_packet packet;
+ struct sr_datafeed_analog analog;
+ char inbuf[4096];
+ int i, x, count, offset, samples_to_get;
+ uint16_t tmp16;
+
+ (void)fd;
+ (void)revents;
+
+ sdi = cb_data;
+ devc = sdi->priv;
+
+ memset(&analog, 0, sizeof(struct sr_datafeed_analog));
+ memset(inbuf, 0, sizeof(inbuf));
+
+ samples_to_get = MIN(4096 / 4, devc->limit_samples);
+
+ sr_spew("Getting %d samples from audio device.", samples_to_get);
+ count = snd_pcm_readi(devc->capture_handle, inbuf, samples_to_get);
+
+ if (count < 0) {
+ sr_err("Failed to read samples: %s.", snd_strerror(count));
+ return FALSE;
+ } else if (count != samples_to_get) {
+ sr_spew("Only got %d/%d samples.", count, samples_to_get);
+ }
+
+ analog.data = g_try_malloc0(count * sizeof(float) * devc->num_probes);
+ if (!analog.data) {
+ sr_err("Failed to malloc sample buffer.");
+ return FALSE;
+ }
+
+ offset = 0;
+
+ for (i = 0; i < count; i++) {
+ for (x = 0; x < devc->num_probes; x++) {
+ tmp16 = *(uint16_t *)(inbuf + (i * 4) + (x * 2));
+ analog.data[offset++] = (float)tmp16;
+ }
+ }
+
+ /* Send a sample packet with the analog values. */
+ analog.num_samples = count;
+ analog.mq = SR_MQ_VOLTAGE; /* FIXME */
+ analog.unit = SR_UNIT_VOLT; /* FIXME */
+ packet.type = SR_DF_ANALOG;
+ packet.payload = &analog;
+ sr_session_send(devc->cb_data, &packet);
+
+ g_free(analog.data);
+
+ devc->num_samples += count;
+
+ /* Stop acquisition if we acquired enough samples. */
+ if (devc->limit_samples > 0) {
+ if (devc->num_samples >= devc->limit_samples) {
+ sr_info("Requested number of samples reached.");
+ sdi->driver->dev_acquisition_stop(sdi, cb_data);
+ }
+ }
+
+ return TRUE;
+}
--- /dev/null
+/*
+ * This file is part of the libsigrok project.
+ *
+ * Copyright (C) 2011 Daniel Ribeiro <drwyrm@gmail.com>
+ * Copyright (C) 2012 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef LIBSIGROK_HARDWARE_ALSA_PROTOCOL_H
+#define LIBSIGROK_HARDWARE_ALSA_PROTOCOL_H
+
+#include "libsigrok.h"
+#include "libsigrok-internal.h"
+
+#include <alsa/asoundlib.h>
+#include <stdint.h>
+
+/* Message logging helpers with driver-specific prefix string. */
+#define DRIVER_LOG_DOMAIN "alsa: "
+#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)
+
+/** Private, per-device-instance driver context. */
+struct dev_context {
+ uint64_t cur_samplerate;
+ uint64_t limit_samples;
+ uint64_t num_samples;
+ uint8_t num_probes;
+ snd_pcm_t *capture_handle;
+ snd_pcm_hw_params_t *hw_params;
+ struct pollfd *ufds;
+ void *cb_data;
+};
+
+SR_PRIV int alsa_receive_data(int fd, int revents, void *cb_data);
+
+#endif /* LIBSIGROK_HARDWARE_ALSA_PROTOCOL_H */
projects / libsigrok.git / commitdiff