Cleanups

spa/plugins/alsa/alsa-source.c

@@ -0,0 +1,819 @@
+/* Spa ALSA Source
+ * Copyright (C) 2016 Wim Taymans <wim.taymans@gmail.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include <stddef.h>
+
+#include <asoundlib.h>
+
+#include <spa/node.h>
+#include <spa/queue.h>
+#include <spa/audio/format.h>
+
+#include "alsa-utils.h"
+
+typedef struct _SpaALSAState SpaALSASource;
+
+static void
+update_state (SpaALSASource *this, SpaNodeState state)
+{
+  SpaNodeEvent event;
+  SpaNodeEventStateChange sc;
+
+  if (this->node.state == state)
+    return;
+
+  this->node.state = state;
+
+  event.type = SPA_NODE_EVENT_TYPE_STATE_CHANGE;
+  event.data = &sc;
+  event.size = sizeof (sc);
+  sc.state = state;
+  this->event_cb (&this->node, &event, this->user_data);
+}
+
+static const char default_device[] = "hw:0";
+static const uint32_t default_buffer_time = 1000;
+static const uint32_t default_period_time = 100;
+static const bool default_period_event = 0;
+
+static void
+reset_alsa_props (SpaALSAProps *props)
+{
+  strncpy (props->device, default_device, 64);
+  props->buffer_time = default_buffer_time;
+  props->period_time = default_period_time;
+  props->period_event = default_period_event;
+  props->props.unset_mask = 0xf;
+}
+
+static const uint32_t min_uint32 = 1;
+static const uint32_t max_uint32 = UINT32_MAX;
+
+static const SpaPropRangeInfo uint32_range[] = {
+  { "min", "Minimum value", { 4, &min_uint32 } },
+  { "max", "Maximum value", { 4, &max_uint32 } },
+};
+
+enum {
+  PROP_ID_DEVICE,
+  PROP_ID_DEVICE_NAME,
+  PROP_ID_CARD_NAME,
+  PROP_ID_BUFFER_TIME,
+  PROP_ID_PERIOD_TIME,
+  PROP_ID_PERIOD_EVENT,
+  PROP_ID_LAST,
+};
+
+static const SpaPropInfo prop_info[] =
+{
+  { PROP_ID_DEVICE,             offsetof (SpaALSAProps, device),
+                                "device", "ALSA device, as defined in an asound configuration file",
+                                SPA_PROP_FLAG_READWRITE,
+                                SPA_PROP_TYPE_STRING, 63,
+                                SPA_PROP_RANGE_TYPE_NONE, 0, NULL,
+                                NULL },
+  { PROP_ID_DEVICE_NAME,        offsetof (SpaALSAProps, device_name),
+                                "device-name", "Human-readable name of the sound device",
+                                SPA_PROP_FLAG_READABLE,
+                                SPA_PROP_TYPE_STRING, 127,
+                                SPA_PROP_RANGE_TYPE_NONE, 0, NULL,
+                                NULL },
+  { PROP_ID_CARD_NAME,          offsetof (SpaALSAProps, card_name),
+                                "card-name", "Human-readable name of the sound card",
+                                SPA_PROP_FLAG_READABLE,
+                                SPA_PROP_TYPE_STRING, 127,
+                                SPA_PROP_RANGE_TYPE_NONE, 0, NULL,
+                                NULL },
+  { PROP_ID_BUFFER_TIME,        offsetof (SpaALSAProps, buffer_time),
+                                "buffer-time", "The total size of the buffer in time",
+                                SPA_PROP_FLAG_READWRITE,
+                                SPA_PROP_TYPE_UINT32, sizeof (uint32_t),
+                                SPA_PROP_RANGE_TYPE_MIN_MAX, 2, uint32_range,
+                                NULL },
+  { PROP_ID_PERIOD_TIME,        offsetof (SpaALSAProps, period_time),
+                                "period-time", "The size of a period in time",
+                                SPA_PROP_FLAG_READWRITE,
+                                SPA_PROP_TYPE_UINT32, sizeof (uint32_t),
+                                SPA_PROP_RANGE_TYPE_MIN_MAX, 2, uint32_range,
+                                NULL },
+  { PROP_ID_PERIOD_EVENT,       offsetof (SpaALSAProps, period_event),
+                                "period-event", "Generate an event each period",
+                                SPA_PROP_FLAG_READWRITE,
+                                SPA_PROP_TYPE_BOOL, sizeof (bool),
+                                SPA_PROP_RANGE_TYPE_NONE, 0, NULL,
+                                NULL },
+};
+
+static SpaResult
+spa_alsa_source_node_get_props (SpaNode       *node,
+                                SpaProps     **props)
+{
+  SpaALSASource *this;
+
+  if (node == NULL || node->handle == NULL || props == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  memcpy (&this->props[0], &this->props[1], sizeof (this->props[1]));
+  *props = &this->props[0].props;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_set_props (SpaNode         *node,
+                              const SpaProps  *props)
+{
+  SpaALSASource *this;
+  SpaALSAProps *p;
+  SpaResult res;
+
+  if (node == NULL || node->handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+  p = &this->props[1];
+
+  if (props == NULL) {
+    reset_alsa_props (p);
+    return SPA_RESULT_OK;
+  }
+
+  res = spa_props_copy (props, &p->props);
+
+  return res;
+}
+
+static SpaResult
+spa_alsa_source_node_send_command (SpaNode        *node,
+                                 SpaNodeCommand *command)
+{
+  SpaALSASource *this;
+
+  if (node == NULL || node->handle == NULL || command == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  switch (command->type) {
+    case SPA_NODE_COMMAND_INVALID:
+      return SPA_RESULT_INVALID_COMMAND;
+
+    case SPA_NODE_COMMAND_START:
+      if (spa_alsa_start (this) < 0)
+        return SPA_RESULT_ERROR;
+
+      update_state (this, SPA_NODE_STATE_STREAMING);
+      break;
+    case SPA_NODE_COMMAND_PAUSE:
+      if (spa_alsa_stop (this) < 0)
+        return SPA_RESULT_ERROR;
+
+      update_state (this, SPA_NODE_STATE_PAUSED);
+      break;
+    case SPA_NODE_COMMAND_FLUSH:
+    case SPA_NODE_COMMAND_DRAIN:
+    case SPA_NODE_COMMAND_MARKER:
+    case SPA_NODE_COMMAND_CLOCK_UPDATE:
+      return SPA_RESULT_NOT_IMPLEMENTED;
+  }
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_set_event_callback (SpaNode              *node,
+                                       SpaNodeEventCallback  event,
+                                       void                 *user_data)
+{
+  SpaALSASource *this;
+
+  if (node == NULL || node->handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  this->event_cb = event;
+  this->user_data = user_data;
+
+  update_state (this, SPA_NODE_STATE_CONFIGURE);
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_get_n_ports (SpaNode       *node,
+                                unsigned int  *n_input_ports,
+                                unsigned int  *max_input_ports,
+                                unsigned int  *n_output_ports,
+                                unsigned int  *max_output_ports)
+{
+  if (node == NULL || node->handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (n_input_ports)
+    *n_input_ports = 0;
+  if (max_input_ports)
+    *max_input_ports = 0;
+  if (n_output_ports)
+    *n_output_ports = 1;
+  if (max_output_ports)
+    *max_output_ports = 1;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_get_port_ids (SpaNode       *node,
+                                   unsigned int   n_input_ports,
+                                   uint32_t      *input_ids,
+                                   unsigned int   n_output_ports,
+                                   uint32_t      *output_ids)
+{
+  if (node == NULL || node->handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (n_output_ports > 0 && output_ids != NULL)
+    output_ids[0] = 0;
+
+  return SPA_RESULT_OK;
+}
+
+
+static SpaResult
+spa_alsa_source_node_add_port (SpaNode        *node,
+                             uint32_t        port_id)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static SpaResult
+spa_alsa_source_node_remove_port (SpaNode        *node,
+                                uint32_t        port_id)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static SpaResult
+spa_alsa_source_node_port_enum_formats (SpaNode         *node,
+                                        uint32_t         port_id,
+                                        SpaFormat      **format,
+                                        const SpaFormat *filter,
+                                        void           **state)
+{
+  SpaALSASource *this;
+  int index;
+
+  if (node == NULL || node->handle == NULL || format == NULL || state == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  if (port_id != 0)
+    return SPA_RESULT_INVALID_PORT;
+
+  index = (*state == NULL ? 0 : *(int*)state);
+
+  switch (index) {
+    case 0:
+      spa_format_audio_init (SPA_MEDIA_TYPE_AUDIO,
+                             SPA_MEDIA_SUBTYPE_RAW,
+                             &this->query_format);
+      break;
+    case 1:
+      spa_format_audio_init (SPA_MEDIA_TYPE_AUDIO,
+                             SPA_MEDIA_SUBTYPE_AAC,
+                             &this->query_format);
+      break;
+    default:
+      return SPA_RESULT_ENUM_END;
+  }
+  *format = &this->query_format.format;
+  *(int*)state = ++index;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_port_set_format (SpaNode            *node,
+                                      uint32_t            port_id,
+                                      SpaPortFormatFlags  flags,
+                                      const SpaFormat    *format)
+{
+  SpaALSASource *this;
+  SpaResult res;
+
+  if (node == NULL || node->handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  if (port_id != 0)
+    return SPA_RESULT_INVALID_PORT;
+
+  if (format == NULL) {
+    this->have_format = false;
+    update_state (this, SPA_NODE_STATE_CONFIGURE);
+    return SPA_RESULT_OK;
+  }
+
+  if ((res = spa_format_audio_parse (format, &this->current_format)) < 0)
+    return res;
+
+  if (spa_alsa_set_format (this, &this->current_format, flags) < 0)
+    return SPA_RESULT_ERROR;
+
+  this->info.flags = SPA_PORT_INFO_FLAG_CAN_ALLOC_BUFFERS |
+                     SPA_PORT_INFO_FLAG_LIVE;
+  this->info.maxbuffering = this->buffer_frames * this->frame_size;
+  this->info.latency = (this->period_frames * SPA_NSEC_PER_SEC) / this->rate;
+  this->info.n_params = 1;
+  this->info.params = this->params;
+  this->params[0] = &this->param_buffers.param;
+  this->param_buffers.param.type = SPA_ALLOC_PARAM_TYPE_BUFFERS;
+  this->param_buffers.param.size = sizeof (this->param_buffers);
+  this->param_buffers.minsize = this->period_frames * this->frame_size;
+  this->param_buffers.stride = 0;
+  this->param_buffers.min_buffers = 1;
+  this->param_buffers.max_buffers = 16;
+  this->param_buffers.align = 16;
+  this->info.features = NULL;
+
+  this->have_format = true;
+
+  update_state (this, SPA_NODE_STATE_READY);
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_port_get_format (SpaNode          *node,
+                                    uint32_t          port_id,
+                                    const SpaFormat **format)
+{
+  SpaALSASource *this;
+
+  if (node == NULL || node->handle == NULL || format == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  if (port_id != 0)
+    return SPA_RESULT_INVALID_PORT;
+
+  if (!this->have_format)
+    return SPA_RESULT_NO_FORMAT;
+
+  *format = &this->current_format.format;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_port_get_info (SpaNode            *node,
+                                  uint32_t            port_id,
+                                  const SpaPortInfo **info)
+{
+  SpaALSASource *this;
+
+  if (node == NULL || node->handle == NULL || info == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  if (port_id != 0)
+    return SPA_RESULT_INVALID_PORT;
+
+  *info = &this->info;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_port_get_props (SpaNode    *node,
+                                   uint32_t    port_id,
+                                   SpaProps  **props)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static SpaResult
+spa_alsa_source_node_port_set_props (SpaNode         *node,
+                                   uint32_t         port_id,
+                                   const SpaProps  *props)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static SpaResult
+spa_alsa_source_node_port_use_buffers (SpaNode         *node,
+                                     uint32_t         port_id,
+                                     SpaBuffer      **buffers,
+                                     uint32_t         n_buffers)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static void
+recycle_buffer (SpaALSASource *this, uint32_t buffer_id)
+{
+  SpaALSABuffer *b;
+
+  b = &this->alloc_buffers[buffer_id];
+  if (!b->outstanding)
+    return;
+
+  b->outstanding = false;
+  SPA_QUEUE_PUSH_TAIL (&this->free, SpaALSABuffer, next, b);
+}
+
+static SpaResult
+spa_alsa_source_node_port_alloc_buffers (SpaNode         *node,
+                                         uint32_t         port_id,
+                                         SpaAllocParam  **params,
+                                         uint32_t         n_params,
+                                         SpaBuffer      **buffers,
+                                         uint32_t        *n_buffers)
+{
+  SpaALSASource *this;
+  SpaALSABuffer *b;
+  unsigned int i, n_bufs;
+  uint8_t *bufmem;
+  size_t buffer_size;
+
+  if (node == NULL || node->handle == NULL || buffers == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (port_id != 0)
+    return SPA_RESULT_INVALID_PORT;
+
+  this = (SpaALSASource *) node->handle;
+
+  if (!this->have_format)
+    return SPA_RESULT_NO_FORMAT;
+
+  n_bufs = *n_buffers;
+
+  SPA_QUEUE_INIT (&this->free);
+  SPA_QUEUE_INIT (&this->ready);
+
+  buffer_size = this->buffer_frames * this->frame_size;
+
+  if (!this->alloc_bufmem)
+    this->alloc_bufmem = spa_memory_alloc_with_fd (SPA_MEMORY_POOL_SHARED,
+                                                   NULL,
+                                                   buffer_size * n_bufs);
+  bufmem = spa_memory_ensure_ptr (this->alloc_bufmem);
+
+  if (!this->alloc_mem)
+    this->alloc_mem = spa_memory_alloc_with_fd (SPA_MEMORY_POOL_SHARED, NULL, sizeof (SpaALSABuffer) * n_bufs);
+  this->alloc_buffers = spa_memory_ensure_ptr (this->alloc_mem);
+  this->n_buffers = n_bufs;
+
+  for (i = 0; i < n_bufs; i++) {
+    b = &this->alloc_buffers[i];
+    b->buffer.id = i;
+    b->buffer.mem.mem = this->alloc_mem->mem;
+    b->buffer.mem.offset = sizeof (SpaALSABuffer) * i;
+    b->buffer.mem.size = sizeof (SpaALSABuffer);
+
+    b->buffer.n_metas = 2;
+    b->buffer.metas = offsetof (SpaALSABuffer, metas);
+    b->buffer.n_datas = 1;
+    b->buffer.datas = offsetof (SpaALSABuffer, datas);
+
+    b->header.flags = 0;
+    b->header.seq = 0;
+    b->header.pts = 0;
+    b->header.dts_offset = 0;
+
+    b->metas[0].type = SPA_META_TYPE_HEADER;
+    b->metas[0].offset = offsetof (SpaALSABuffer, header);
+    b->metas[0].size = sizeof (b->header);
+
+    b->ringbuffer.readindex = 0;
+    b->ringbuffer.writeindex = 0;
+    b->ringbuffer.size = 0;
+    b->ringbuffer.size_mask = 0;
+
+    b->metas[1].type = SPA_META_TYPE_RINGBUFFER;
+    b->metas[1].offset = offsetof (SpaALSABuffer, ringbuffer);
+    b->metas[1].size = sizeof (b->ringbuffer);
+
+    b->datas[0].mem.mem = this->alloc_bufmem->mem;
+    b->datas[0].mem.offset = buffer_size * i;
+    b->datas[0].mem.size = buffer_size;
+    b->datas[0].stride = 0;
+    b->ptr = bufmem + buffer_size * i;
+
+    buffers[i] = b->outbuf = &b->buffer;
+
+    b->outstanding = true;
+    recycle_buffer (this, b->outbuf->id);
+  }
+  *n_buffers = n_bufs;
+
+  this->have_buffers = true;
+
+  update_state (this, SPA_NODE_STATE_PAUSED);
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_port_reuse_buffer (SpaNode         *node,
+                                        uint32_t         port_id,
+                                        uint32_t         buffer_id)
+{
+  SpaALSASource *this;
+
+  if (node == NULL || node->handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  if (port_id != 0)
+    return SPA_RESULT_INVALID_PORT;
+
+  if (!this->have_buffers)
+    return SPA_RESULT_NO_BUFFERS;
+
+  if (buffer_id >= this->n_buffers)
+    return SPA_RESULT_INVALID_BUFFER_ID;
+
+  recycle_buffer (this, buffer_id);
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_port_get_status (SpaNode              *node,
+                                      uint32_t              port_id,
+                                      const SpaPortStatus **status)
+{
+  SpaALSASource *this;
+
+  if (node == NULL || node->handle == NULL || status == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  if (port_id != 0)
+    return SPA_RESULT_INVALID_PORT;
+
+  *status = &this->status;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_alsa_source_node_port_push_input (SpaNode          *node,
+                                    unsigned int      n_info,
+                                    SpaPortInputInfo *info)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static SpaResult
+spa_alsa_source_node_port_pull_output (SpaNode           *node,
+                                     unsigned int       n_info,
+                                     SpaPortOutputInfo *info)
+{
+  SpaALSASource *this;
+  unsigned int i;
+  bool have_error = false;
+
+  if (node == NULL || node->handle == NULL || n_info == 0 || info == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) node->handle;
+
+  for (i = 0; i < n_info; i++) {
+    SpaALSABuffer *b;
+
+    if (info[i].port_id != 0) {
+      info[i].status = SPA_RESULT_INVALID_PORT;
+      have_error = true;
+      continue;
+    }
+
+    if (!this->have_format) {
+      info[i].status = SPA_RESULT_NO_FORMAT;
+      have_error = true;
+      continue;
+    }
+
+    SPA_QUEUE_POP_HEAD (&this->ready, SpaALSABuffer, next, b);
+    if (b == NULL) {
+      info[i].status = SPA_RESULT_UNEXPECTED;
+      have_error = true;
+      continue;
+    }
+    b->outstanding = true;
+
+    info[i].buffer_id = b->outbuf->id;
+    info[i].status = SPA_RESULT_OK;
+  }
+  if (have_error)
+    return SPA_RESULT_ERROR;
+
+  return SPA_RESULT_OK;
+
+}
+
+static const SpaNode alsasource_node = {
+  NULL,
+  sizeof (SpaNode),
+  NULL,
+  SPA_NODE_STATE_INIT,
+  spa_alsa_source_node_get_props,
+  spa_alsa_source_node_set_props,
+  spa_alsa_source_node_send_command,
+  spa_alsa_source_node_set_event_callback,
+  spa_alsa_source_node_get_n_ports,
+  spa_alsa_source_node_get_port_ids,
+  spa_alsa_source_node_add_port,
+  spa_alsa_source_node_remove_port,
+  spa_alsa_source_node_port_enum_formats,
+  spa_alsa_source_node_port_set_format,
+  spa_alsa_source_node_port_get_format,
+  spa_alsa_source_node_port_get_info,
+  spa_alsa_source_node_port_get_props,
+  spa_alsa_source_node_port_set_props,
+  spa_alsa_source_node_port_use_buffers,
+  spa_alsa_source_node_port_alloc_buffers,
+  spa_alsa_source_node_port_reuse_buffer,
+  spa_alsa_source_node_port_get_status,
+  spa_alsa_source_node_port_push_input,
+  spa_alsa_source_node_port_pull_output,
+};
+static SpaResult
+spa_alsa_source_clock_get_props (SpaClock  *clock,
+                                 SpaProps **props)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static SpaResult
+spa_alsa_source_clock_set_props (SpaClock       *clock,
+                                 const SpaProps *props)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static SpaResult
+spa_alsa_source_clock_get_time (SpaClock         *clock,
+                                int32_t          *rate,
+                                int64_t          *ticks,
+                                int64_t          *monotonic_time)
+{
+  SpaALSASource *this;
+
+  if (clock == NULL || clock->handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) clock->handle;
+
+  if (rate)
+    *rate = SPA_USEC_PER_SEC;
+  if (ticks)
+    *ticks = this->last_ticks;
+  if (monotonic_time)
+    *monotonic_time = this->last_monotonic;
+
+  return SPA_RESULT_OK;
+}
+
+static const SpaClock alsasource_clock = {
+  NULL,
+  sizeof (SpaClock),
+  NULL,
+  SPA_CLOCK_STATE_STOPPED,
+  spa_alsa_source_clock_get_props,
+  spa_alsa_source_clock_set_props,
+  spa_alsa_source_clock_get_time,
+};
+
+static SpaResult
+spa_alsa_source_get_interface (SpaHandle               *handle,
+                             uint32_t                 interface_id,
+                             void                   **interface)
+{
+  SpaALSASource *this;
+
+  if (handle == NULL || interface == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this = (SpaALSASource *) handle;
+
+  switch (interface_id) {
+    case SPA_INTERFACE_ID_NODE:
+      *interface = &this->node;
+      break;
+    case SPA_INTERFACE_ID_CLOCK:
+      *interface = &this->clock;
+      break;
+    default:
+      return SPA_RESULT_UNKNOWN_INTERFACE;
+  }
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+alsa_source_clear (SpaHandle *handle)
+{
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+alsa_source_init (const SpaHandleFactory  *factory,
+                  SpaHandle               *handle,
+                  const SpaDict           *info)
+{
+  SpaALSASource *this;
+  unsigned int i;
+
+  if (factory == NULL || handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  handle->get_interface = spa_alsa_source_get_interface;
+  handle->clear = alsa_source_clear;
+
+  this = (SpaALSASource *) handle;
+  this->node = alsasource_node;
+  this->node.handle = handle;
+  this->clock = alsasource_clock;
+  this->clock.handle = handle;
+  this->props[1].props.n_prop_info = PROP_ID_LAST;
+  this->props[1].props.prop_info = prop_info;
+  this->stream = SND_PCM_STREAM_CAPTURE;
+  reset_alsa_props (&this->props[1]);
+
+  this->status.flags = SPA_PORT_STATUS_FLAG_NEED_INPUT;
+
+  for (i = 0; info && i < info->n_items; i++) {
+    if (!strcmp (info->items[i].key, "alsa.card")) {
+      snprintf (this->props[1].device, 63, "hw:%s", info->items[i].value);
+      this->props[1].props.unset_mask &= ~1;
+    }
+  }
+  return SPA_RESULT_OK;
+}
+
+static const SpaInterfaceInfo alsa_source_interfaces[] =
+{
+  { SPA_INTERFACE_ID_NODE,
+    SPA_INTERFACE_ID_NODE_NAME,
+    SPA_INTERFACE_ID_NODE_DESCRIPTION,
+  },
+  { SPA_INTERFACE_ID_CLOCK,
+    SPA_INTERFACE_ID_CLOCK_NAME,
+    SPA_INTERFACE_ID_CLOCK_DESCRIPTION,
+  },
+};
+
+static SpaResult
+alsa_source_enum_interface_info (const SpaHandleFactory  *factory,
+                                 const SpaInterfaceInfo **info,
+                                 void                   **state)
+{
+  int index;
+
+  if (factory == NULL || info == NULL || state == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  index = (*state == NULL ? 0 : *(int*)state);
+
+  if (index < 0 || index >= SPA_N_ELEMENTS (alsa_source_interfaces))
+    return SPA_RESULT_ENUM_END;
+
+  *info = &alsa_source_interfaces[index];
+
+  *(int*)state = ++index;
+
+  return SPA_RESULT_OK;
+}
+
+const SpaHandleFactory spa_alsa_source_factory =
+{ "alsa-source",
+  NULL,
+  sizeof (SpaALSASource),
+  alsa_source_init,
+  alsa_source_enum_interface_info,
+};