+++ /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"
-
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-
-#define DEFAULT_PROBES 2
-#define SAMPLE_WIDTH 16
-#define DEFAULT_SAMPLERATE 44100
-
-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)
-{
- struct drv_context *drvc;
-
- if (!(drvc = di->priv))
- return SR_OK;
-
- g_slist_free_full(drvc->instances, (GDestroyNotify)alsa_dev_inst_clear);
- drvc->instances = NULL;
-
- 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)
-{
- return alsa_scan(options, di);
-}
-
-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;
-
- if (!(devc->hwdev)) {
- sr_err("devc->hwdev was NULL.");
- return SR_ERR_BUG;
- }
-
- sr_dbg("Opening audio device '%s' for stream capture.", devc->hwdev);
- ret = snd_pcm_open(&devc->capture_handle, devc->hwdev,
- SND_PCM_STREAM_CAPTURE, 0);
- if (ret < 0) {
- sr_err("Can't open audio device: %s.", snd_strerror(ret));
- return SR_ERR;
- }
-
- 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->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));
- devc->capture_handle = NULL;
- }
- } 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 = &devc->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 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(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,
-};
projects / libsigrok.git / blobdiff