more hacking

Move plugin API to separate directory for now
Add ringbuffer and way to get ringbuffer from a port

spa/plugins/audiomixer/audiomixer.c

@@ -0,0 +1,740 @@
+/* Spa
+ * 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 <string.h>
+#include <stdio.h>
+
+#include <spa/node.h>
+#include <spa/audio/raw.h>
+
+#define MAX_PORTS       128
+
+typedef struct _SpaAudioMixer SpaAudioMixer;
+
+typedef struct {
+  SpaProps props;
+} SpaAudioMixerProps;
+
+typedef struct {
+  SpaProps prop;
+} SpaAudioMixerPortProps;
+
+typedef struct _MixerBuffer MixerBuffer;
+
+struct _MixerBuffer {
+  SpaBuffer buffer;
+  SpaMeta meta[1];
+  SpaMetaHeader header;
+  SpaData data[1];
+  uint16_t samples[4096];
+};
+
+typedef struct {
+  bool valid;
+  SpaAudioMixerPortProps props;
+  SpaPortInfo info;
+  SpaPortStatus status;
+  SpaBuffer *buffer;
+  size_t buffer_index;
+  size_t buffer_offset;
+  size_t buffer_queued;
+  MixerBuffer mix;
+} SpaAudioMixerPort;
+
+struct _SpaAudioMixer {
+  SpaHandle  handle;
+
+  SpaAudioMixerProps props;
+  SpaAudioMixerProps tmp_props;
+
+  SpaEventCallback event_cb;
+  void *user_data;
+
+  bool have_format;
+  SpaAudioRawFormat query_format;
+  SpaAudioRawFormat current_format;
+
+  int port_count;
+  int port_queued;
+  SpaAudioMixerPort ports[MAX_PORTS];
+};
+
+enum {
+  PROP_ID_LAST,
+};
+
+static const SpaPropInfo prop_info[] =
+{
+  { PROP_ID_LAST, },
+};
+
+static void
+reset_audiomixer_props (SpaAudioMixerProps *props)
+{
+}
+
+static SpaResult
+spa_audiomixer_node_get_props (SpaHandle     *handle,
+                               SpaProps     **props)
+{
+  SpaAudioMixer *this = (SpaAudioMixer *) handle;
+
+  if (handle == NULL || props == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  memcpy (&this->tmp_props, &this->props, sizeof (this->tmp_props));
+  *props = &this->tmp_props.props;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_audiomixer_node_set_props (SpaHandle       *handle,
+                               const SpaProps  *props)
+{
+  SpaAudioMixer *this = (SpaAudioMixer *) handle;
+  SpaAudioMixerProps *p = &this->props;
+  SpaResult res;
+
+  if (handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (props == NULL) {
+    reset_audiomixer_props (p);
+    return SPA_RESULT_OK;
+  }
+  res = spa_props_copy (props, &p->props);
+
+  return res;
+}
+
+static SpaResult
+spa_audiomixer_node_send_command (SpaHandle     *handle,
+                                  SpaCommand    *command)
+{
+  SpaAudioMixer *this = (SpaAudioMixer *) handle;
+
+  if (handle == NULL || command == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  switch (command->type) {
+    case SPA_COMMAND_INVALID:
+      return SPA_RESULT_INVALID_COMMAND;
+
+    case SPA_COMMAND_ACTIVATE:
+      if (this->event_cb) {
+        SpaEvent event;
+
+        event.refcount = 1;
+        event.notify = NULL;
+        event.type = SPA_EVENT_TYPE_ACTIVATED;
+        event.port_id = -1;
+        event.data = NULL;
+        event.size = 0;
+
+        this->event_cb (handle, &event, this->user_data);
+      }
+      break;
+
+    case SPA_COMMAND_DEACTIVATE:
+      if (this->event_cb) {
+        SpaEvent event;
+
+        event.refcount = 1;
+        event.notify = NULL;
+        event.type = SPA_EVENT_TYPE_DEACTIVATED;
+        event.port_id = -1;
+        event.data = NULL;
+        event.size = 0;
+
+        this->event_cb (handle, &event, this->user_data);
+      }
+      break;
+
+    case SPA_COMMAND_START:
+    case SPA_COMMAND_STOP:
+    case SPA_COMMAND_FLUSH:
+    case SPA_COMMAND_DRAIN:
+    case SPA_COMMAND_MARKER:
+      return SPA_RESULT_NOT_IMPLEMENTED;
+  }
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_audiomixer_node_set_event_callback (SpaHandle        *handle,
+                                        SpaEventCallback  event,
+                                        void             *user_data)
+{
+  SpaAudioMixer *this = (SpaAudioMixer *) handle;
+
+  if (handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  this->event_cb = event;
+  this->user_data = user_data;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_audiomixer_node_get_n_ports (SpaHandle     *handle,
+                                 unsigned int  *n_input_ports,
+                                 unsigned int  *max_input_ports,
+                                 unsigned int  *n_output_ports,
+                                 unsigned int  *max_output_ports)
+{
+  if (handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (n_input_ports)
+    *n_input_ports = 0;
+  if (n_output_ports)
+    *n_output_ports = 1;
+  if (max_input_ports)
+    *max_input_ports = MAX_PORTS;
+  if (max_output_ports)
+    *max_output_ports = 1;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_audiomixer_node_get_port_ids (SpaHandle     *handle,
+                                  unsigned int   n_input_ports,
+                                  uint32_t      *input_ids,
+                                  unsigned int   n_output_ports,
+                                  uint32_t      *output_ids)
+{
+  SpaAudioMixer *this = (SpaAudioMixer *) handle;
+  int i, idx;
+
+  if (handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (input_ids) {
+    for (i = 1, idx = 0; i < MAX_PORTS && idx < n_input_ports; i++) {
+      if (this->ports[i].valid)
+        input_ids[idx++] = i;
+    }
+  }
+  if (n_output_ports > 0 && output_ids)
+    output_ids[0] = 0;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_audiomixer_node_add_port (SpaHandle      *handle,
+                              SpaDirection    direction,
+                              uint32_t       *port_id)
+{
+  SpaAudioMixer *this = (SpaAudioMixer *) handle;
+  int i;
+
+  if (handle == NULL || port_id == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (direction != SPA_DIRECTION_INPUT)
+    return SPA_RESULT_INVALID_DIRECTION;
+
+  for (i = 1; i < MAX_PORTS; i++)
+    if (!this->ports[i].valid)
+      break;
+  if (i == MAX_PORTS)
+    return SPA_RESULT_TOO_MANY_PORTS;
+
+  this->ports[i].valid = true;
+  *port_id = i;
+  this->port_count++;
+
+  this->ports[i].info.flags = SPA_PORT_INFO_FLAG_CAN_USE_BUFFER |
+                              SPA_PORT_INFO_FLAG_REMOVABLE |
+                              SPA_PORT_INFO_FLAG_OPTIONAL |
+                              SPA_PORT_INFO_FLAG_IN_PLACE;
+  this->ports[i].status.flags = SPA_PORT_STATUS_FLAG_NEED_INPUT;
+
+  this->ports[0].status.flags &= ~SPA_PORT_STATUS_FLAG_HAVE_OUTPUT;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_audiomixer_node_remove_port (SpaHandle      *handle,
+                                 uint32_t        port_id)
+{
+  SpaAudioMixer *this = (SpaAudioMixer *) handle;
+
+  if (handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (port_id == 0 || port_id >= MAX_PORTS || !this->ports[port_id].valid)
+    return SPA_RESULT_INVALID_PORT;
+
+  this->ports[port_id].valid = false;
+  this->port_count--;
+  if (this->ports[port_id].buffer) {
+    spa_buffer_unref (this->ports[port_id].buffer);
+    this->ports[port_id].buffer = NULL;
+    this->port_queued--;
+  }
+  if (this->port_count == this->port_queued)
+    this->ports[0].status.flags |= SPA_PORT_STATUS_FLAG_HAVE_OUTPUT;
+
+  return SPA_RESULT_OK;
+}
+
+
+static SpaResult
+spa_audiomixer_node_enum_port_formats (SpaHandle       *handle,
+                                       uint32_t         port_id,
+                                       unsigned int     index,
+                                       SpaFormat      **format)
+{
+  SpaAudioMixer *this = (SpaAudioMixer *) handle;
+
+  if (handle == NULL || format == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (port_id > MAX_PORTS)
+    return SPA_RESULT_INVALID_PORT;
+
+  switch (index) {
+    case 0:
+      spa_audio_raw_format_init (&this->query_format);
+      break;
+    default:
+      return SPA_RESULT_ENUM_END;
+  }
+  *format = &this->query_format.format;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_audiomixer_node_set_port_format (SpaHandle       *handle,
+                                     uint32_t         port_id,
+                                     int              test_only,
+                                     const SpaFormat *format)
+{
+  SpaAudioMixer *this = (SpaAudioMixer *) handle;
+  SpaResult res;
+
+  if (handle == NULL || format == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (port_id > MAX_PORTS)
+    return SPA_RESULT_INVALID_PORT;
+
+  if (format == NULL) {
+    this->have_format = false;
+    return SPA_RESULT_OK;
+  }
+
+  if ((res = spa_audio_raw_format_parse (format, &this->current_format)) < 0)
+    return res;
+
+  this->have_format = true;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_audiomixer_node_get_port_format (SpaHandle        *handle,
+                                     uint32_t          port_id,
+                                     const SpaFormat **format)
+{
+  SpaAudioMixer *this = (SpaAudioMixer *) handle;
+
+  if (handle == NULL || format == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (port_id >= MAX_PORTS || !this->ports[port_id].valid)
+    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_audiomixer_node_get_port_info (SpaHandle          *handle,
+                                   uint32_t            port_id,
+                                   const SpaPortInfo **info)
+{
+  SpaAudioMixer *this = (SpaAudioMixer *) handle;
+
+  if (handle == NULL || info == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (port_id >= MAX_PORTS || !this->ports[port_id].valid)
+    return SPA_RESULT_INVALID_PORT;
+
+  *info = &this->ports[port_id].info;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_audiomixer_node_get_port_props (SpaHandle *handle,
+                                    uint32_t   port_id,
+                                    SpaProps **props)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static SpaResult
+spa_audiomixer_node_set_port_props (SpaHandle      *handle,
+                                    uint32_t        port_id,
+                                    const SpaProps *props)
+{
+  return SPA_RESULT_NOT_IMPLEMENTED;
+}
+
+static SpaResult
+spa_audiomixer_node_get_port_status (SpaHandle            *handle,
+                                     uint32_t              port_id,
+                                     const SpaPortStatus **status)
+{
+  SpaAudioMixer *this = (SpaAudioMixer *) handle;
+
+  if (handle == NULL || status == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (port_id >= MAX_PORTS || !this->ports[port_id].valid)
+    return SPA_RESULT_INVALID_PORT;
+
+  if (!this->have_format)
+    return SPA_RESULT_NO_FORMAT;
+
+  *status = &this->ports[port_id].status;
+
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_audiomixer_node_push_port_input (SpaHandle      *handle,
+                                     unsigned int    n_info,
+                                     SpaInputInfo   *info)
+{
+  SpaAudioMixer *this = (SpaAudioMixer *) handle;
+  SpaBuffer *buffer;
+  SpaEvent *event;
+  unsigned int i;
+  bool have_error = false;
+
+  if (handle == NULL || n_info == 0 || info == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (this->ports[0].status.flags & SPA_PORT_STATUS_FLAG_HAVE_OUTPUT)
+    return SPA_RESULT_HAVE_ENOUGH_INPUT;
+
+  for (i = 0; i < n_info; i++) {
+    int idx = info[i].port_id;
+
+    if (idx >= MAX_PORTS || !this->ports[idx].valid) {
+      info[i].status = SPA_RESULT_INVALID_PORT;
+      have_error = true;
+      continue;
+    }
+
+    event = info[i].event;
+    buffer = info[i].buffer;
+
+    if (buffer == NULL && event == NULL) {
+      info[i].status = SPA_RESULT_INVALID_ARGUMENTS;
+      have_error = true;
+      continue;
+    }
+
+    if (buffer) {
+      if (!this->have_format) {
+        info[i].status = SPA_RESULT_NO_FORMAT;
+        have_error = true;
+        continue;
+      }
+
+      if (this->ports[idx].buffer != NULL) {
+        info[i].status = SPA_RESULT_HAVE_ENOUGH_INPUT;
+        have_error = true;
+        continue;
+      }
+      this->ports[idx].buffer = spa_buffer_ref (buffer);
+      this->ports[idx].buffer_queued = buffer->size;
+      this->ports[idx].buffer_index = 0;
+      this->ports[idx].buffer_offset = 0;
+      this->port_queued++;
+
+      if (this->port_queued == this->port_count)
+        this->ports[0].status.flags |= SPA_PORT_STATUS_FLAG_HAVE_OUTPUT;
+    }
+    if (event) {
+      info[i].status = SPA_RESULT_NOT_IMPLEMENTED;
+      have_error = true;
+      continue;
+    }
+    info[i].status = SPA_RESULT_OK;
+  }
+  if (have_error)
+    return SPA_RESULT_ERROR;
+
+  return SPA_RESULT_OK;
+}
+
+
+static void
+pull_port (SpaAudioMixer *this, uint32_t port_id, SpaOutputInfo *info, size_t pull_size)
+{
+  SpaEvent event;
+  MixerBuffer *buffer = &this->ports[port_id].mix;
+
+  event.refcount = 1;
+  event.notify = NULL;
+  event.type = SPA_EVENT_TYPE_PULL_INPUT;
+  event.port_id = port_id;
+  event.data = buffer;
+
+  buffer->buffer.refcount = 1;
+  buffer->buffer.notify = NULL;
+  buffer->buffer.size = pull_size;
+  buffer->buffer.n_metas = 1;
+  buffer->buffer.metas = buffer->meta;
+  buffer->buffer.n_datas = 1;
+  buffer->buffer.datas = buffer->data;
+
+  buffer->header.flags = 0;
+  buffer->header.seq = 0;
+  buffer->header.pts = 0;
+  buffer->header.dts_offset = 0;
+
+  buffer->meta[0].type = SPA_META_TYPE_HEADER;
+  buffer->meta[0].data = &buffer->header;
+  buffer->meta[0].size = sizeof (buffer->header);
+
+  buffer->data[0].type = SPA_DATA_TYPE_MEMPTR;
+  buffer->data[0].data = buffer->samples;
+  buffer->data[0].size = pull_size;
+
+  this->event_cb (&this->handle, &event, this->user_data);
+}
+
+static void
+add_port_data (SpaAudioMixer *this, SpaBuffer *out, SpaAudioMixerPort *port)
+{
+  int i, oi = 0;
+  uint8_t *op, *ip;
+  size_t os, is, chunk;
+
+  op = ip = NULL;
+
+  while (true) {
+    if (op == NULL) {
+      op = out->datas[oi].data;
+      os = out->datas[oi].size;
+    }
+    if (ip == NULL) {
+      ip = port->buffer->datas[port->buffer_index].data;
+      is = port->buffer->datas[port->buffer_index].size;
+      ip += port->buffer_offset;
+      is -= port->buffer_offset;
+    }
+
+    chunk = os < is ? os : is;
+
+    for (i = 0; i < chunk; i++)
+      op[i] += ip[i];
+
+    if ((is -= chunk) == 0) {
+      if (++port->buffer_index == port->buffer->n_datas) {
+        spa_buffer_unref (port->buffer);
+        port->buffer = NULL;
+        port->status.flags = SPA_PORT_STATUS_FLAG_NEED_INPUT;
+        this->ports[0].status.flags &= ~SPA_PORT_STATUS_FLAG_HAVE_OUTPUT;
+        break;
+      }
+      port->buffer_offset = 0;
+      ip = NULL;
+    } else {
+      port->buffer_offset += chunk;
+    }
+    port->buffer_queued -= chunk;
+
+    if ((os -= chunk) == 0) {
+      if (++oi == out->n_datas)
+        break;
+      op = NULL;
+    }
+  }
+}
+
+static SpaResult
+mix_data (SpaAudioMixer *this, SpaOutputInfo *info)
+{
+  int i, min_size, min_port, pull_size;
+
+  if (info->port_id != 0)
+    return SPA_RESULT_INVALID_PORT;
+
+  if (info->buffer) {
+    pull_size = info->buffer->size;
+  } else {
+    pull_size = 0;
+  }
+
+  min_size = 0;
+  min_port = 0;
+  for (i = 1; i < MAX_PORTS; i++) {
+    if (!this->ports[i].valid)
+      continue;
+
+    if (this->ports[i].buffer == NULL) {
+      if (pull_size && info->flags & SPA_OUTPUT_FLAG_PULL) {
+        pull_port (this, i, info, pull_size);
+      }
+      if (this->ports[i].buffer == NULL)
+        return SPA_RESULT_NEED_MORE_INPUT;
+    }
+
+    if (min_size == 0 || this->ports[i].buffer_queued < min_size) {
+      min_size = this->ports[i].buffer_queued;
+      min_port = i;
+    }
+  }
+  if (min_port == 0)
+    return SPA_RESULT_NEED_MORE_INPUT;
+
+  if (info->buffer) {
+    if (info->buffer->size < min_size)
+      min_size = info->buffer->size;
+    else
+      info->buffer->size = min_size;
+  } else {
+    info->buffer = this->ports[min_port].buffer;
+    this->ports[min_port].buffer = NULL;
+    this->ports[min_port].status.flags = SPA_PORT_STATUS_FLAG_NEED_INPUT;
+    this->ports[0].status.flags &= ~SPA_PORT_STATUS_FLAG_HAVE_OUTPUT;
+  }
+
+  for (i = 1; i < MAX_PORTS; i++) {
+    if (!this->ports[i].valid || this->ports[i].buffer == NULL)
+      continue;
+
+    add_port_data (this, info->buffer, &this->ports[i]);
+  }
+  return SPA_RESULT_OK;
+}
+
+static SpaResult
+spa_audiomixer_node_pull_port_output (SpaHandle      *handle,
+                                      unsigned int    n_info,
+                                      SpaOutputInfo  *info)
+{
+  SpaAudioMixer *this = (SpaAudioMixer *) handle;
+  int i;
+  bool have_error = false;
+
+  if (handle == NULL || n_info == 0 || info == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  if (info->port_id != 0)
+    return SPA_RESULT_INVALID_PORT;
+
+  if (!this->have_format)
+    return SPA_RESULT_NO_FORMAT;
+
+//  if (!(this->ports[0].status.flags & SPA_PORT_STATUS_FLAG_HAVE_OUTPUT))
+//    return SPA_RESULT_NEED_MORE_INPUT;
+
+  for (i = 0; i < n_info; i++) {
+    if ((info[i].status = mix_data (this, &info[i])) < 0) {
+      printf ("error mixing: %d\n", info[i].status);
+      have_error = true;
+      continue;
+    }
+  }
+  if (have_error)
+    return SPA_RESULT_ERROR;
+
+  return SPA_RESULT_OK;
+}
+
+static const SpaNode audiomixer_node = {
+  sizeof (SpaNode),
+  spa_audiomixer_node_get_props,
+  spa_audiomixer_node_set_props,
+  spa_audiomixer_node_send_command,
+  spa_audiomixer_node_set_event_callback,
+  spa_audiomixer_node_get_n_ports,
+  spa_audiomixer_node_get_port_ids,
+  spa_audiomixer_node_add_port,
+  spa_audiomixer_node_remove_port,
+  spa_audiomixer_node_enum_port_formats,
+  spa_audiomixer_node_set_port_format,
+  spa_audiomixer_node_get_port_format,
+  spa_audiomixer_node_get_port_info,
+  spa_audiomixer_node_get_port_props,
+  spa_audiomixer_node_set_port_props,
+  spa_audiomixer_node_get_port_status,
+  spa_audiomixer_node_push_port_input,
+  spa_audiomixer_node_pull_port_output,
+};
+
+static SpaResult
+spa_audiomixer_get_interface (SpaHandle   *handle,
+                              uint32_t     interface_id,
+                              const void **interface)
+{
+  if (handle == NULL || interface == 0)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  switch (interface_id) {
+    case SPA_INTERFACE_ID_NODE:
+      *interface = &audiomixer_node;
+      break;
+    default:
+      return SPA_RESULT_UNKNOWN_INTERFACE;
+  }
+  return SPA_RESULT_OK;
+}
+
+SpaHandle *
+spa_audiomixer_new (void)
+{
+  SpaHandle *handle;
+  SpaAudioMixer *this;
+
+  handle = calloc (1, sizeof (SpaAudioMixer));
+  handle->get_interface = spa_audiomixer_get_interface;
+
+  this = (SpaAudioMixer *) handle;
+  this->props.props.n_prop_info = PROP_ID_LAST;
+  this->props.props.prop_info = prop_info;
+  this->props.props.set_prop = spa_props_generic_set_prop;
+  this->props.props.get_prop = spa_props_generic_get_prop;
+  reset_audiomixer_props (&this->props);
+
+  this->ports[0].valid = true;
+  this->ports[0].info.flags = SPA_PORT_INFO_FLAG_CAN_GIVE_BUFFER |
+                              SPA_PORT_INFO_FLAG_CAN_USE_BUFFER |
+                              SPA_PORT_INFO_FLAG_NO_REF;
+  return handle;
+}

spa/plugins/audiomixer/meson.build

@@ -0,0 +1,7 @@
+audiomixer_sources = ['audiomixer.c', 'plugin.c']
+
+audiomixerlib = shared_library('spa-audiomixer',
+                          audiomixer_sources,
+                          include_directories : inc,
+                          link_with : spalib,
+                          install : true)

spa/plugins/audiomixer/plugin.c

@@ -0,0 +1,78 @@
+/* Spa Audiomixer plugin
+ * 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 <spa/plugin.h>
+#include <spa/node.h>
+
+SpaHandle * spa_audiomixer_new (void);
+
+static SpaResult
+audiomixer_instantiate (const SpaHandleFactory  *factory,
+                        SpaHandle              **handle)
+{
+  if (factory == NULL || handle == NULL)
+    return SPA_RESULT_INVALID_ARGUMENTS;
+
+  *handle = spa_audiomixer_new ();
+
+  return SPA_RESULT_OK;
+}
+
+static const SpaInterfaceInfo audiomixer_interfaces[] =
+{
+  { SPA_INTERFACE_ID_NODE,
+    SPA_INTERFACE_ID_NODE_NAME,
+    SPA_INTERFACE_ID_NODE_DESCRIPTION,
+  },
+};
+
+static SpaResult
+audiomixer_enum_interface_info (const SpaHandleFactory  *factory,
+                                unsigned int             index,
+                                const SpaInterfaceInfo **info)
+{
+  if (index >= 1)
+    return SPA_RESULT_ENUM_END;
+
+  *info = &audiomixer_interfaces[index];
+
+  return SPA_RESULT_OK;
+}
+
+static const SpaHandleFactory factories[] =
+{
+  { "audiomixer",
+    NULL,
+    audiomixer_instantiate,
+    audiomixer_enum_interface_info,
+  },
+};
+
+
+SpaResult
+spa_enum_handle_factory (unsigned int             index,
+                         const SpaHandleFactory **factory)
+{
+  if (index >= 1)
+    return SPA_RESULT_ENUM_END;
+
+  *factory = &factories[index];
+
+  return SPA_RESULT_OK;
+}