text: /* Spa
   *
   * Copyright © 2018 Wim Taymans
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the "Software"),
   * to deal in the Software without restriction, including without limitation
   * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   * and/or sell copies of the Software, and to permit persons to whom the
   * Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice (including the next
   * paragraph) shall be included in all copies or substantial portions of the
   * Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
   * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
   * DEALINGS IN THE SOFTWARE.
   */
  
  #include <errno.h>
  #include <string.h>
  #include <stdio.h>
  #include <limits.h>
  
  #include <spa/support/plugin.h>
  #include <spa/support/cpu.h>
  #include <spa/support/log.h>
  #include <spa/utils/result.h>
  #include <spa/utils/list.h>
  #include <spa/utils/names.h>
  #include <spa/node/node.h>
  #include <spa/node/io.h>
  #include <spa/node/utils.h>
  #include <spa/param/audio/format-utils.h>
  #include <spa/param/param.h>
  #include <spa/pod/filter.h>
  #include <spa/debug/types.h>
  #include <spa/debug/mem.h>
  #include <spa/debug/pod.h>
  
  #include "fmt-ops.h"
  
  #define NAME "merger"
  
  #define DEFAULT_RATE		48000
  #define DEFAULT_CHANNELS	2
  
  #define MAX_SAMPLES	8192
  #define MAX_ALIGN	16
  #define MAX_BUFFERS	64
  #define MAX_DATAS	32
  #define MAX_PORTS	128
  
  struct buffer {
  	uint32_t id;
  #define BUFFER_FLAG_QUEUED	(1<<0)
  	uint32_t flags;
  	struct spa_list link;
  	struct spa_buffer *buf;
  	void *datas[MAX_DATAS];
  };
  
  struct port {
  	uint32_t direction;
  	uint32_t id;
  
  	struct spa_io_buffers *io;
  
  	uint64_t info_all;
  	struct spa_port_info info;
  	struct spa_param_info params[8];
  	char position[16];
  
  	struct spa_audio_info format;
  	uint32_t blocks;
  	uint32_t stride;
  
  	struct buffer buffers[MAX_BUFFERS];
  	uint32_t n_buffers;
  
  	struct spa_list queue;
  
  	unsigned int have_format:1;
  };
  
  struct impl {
  	struct spa_handle handle;
  	struct spa_node node;
  
  	struct spa_log *log;
  	struct spa_cpu *cpu;
  
  	uint64_t info_all;
  	struct spa_node_info info;
  	struct spa_param_info params[8];
  
  	struct spa_hook_list hooks;
  
  	uint32_t port_count;
  	uint32_t monitor_count;
  	struct port in_ports[MAX_PORTS];
  	struct port out_ports[MAX_PORTS + 1];
  
  	struct convert conv;
  	uint32_t cpu_flags;
  	unsigned int is_passthrough:1;
  	unsigned int started:1;
  	unsigned int monitor:1;
  	unsigned int have_profile:1;
  
  	float empty[MAX_SAMPLES*2 + MAX_ALIGN];
  };
  
  #define CHECK_IN_PORT(this,d,p)		((d) == SPA_DIRECTION_INPUT && (p) < this->port_count)
  #define CHECK_OUT_PORT(this,d,p)	((d) == SPA_DIRECTION_OUTPUT && (p) <= this->monitor_count)
  #define CHECK_PORT(this,d,p)		(CHECK_OUT_PORT(this,d,p) || CHECK_IN_PORT (this,d,p))
  #define GET_IN_PORT(this,p)		(&this->in_ports[p])
  #define GET_OUT_PORT(this,p)		(&this->out_ports[p])
  #define GET_PORT(this,d,p)		(d == SPA_DIRECTION_INPUT ? GET_IN_PORT(this,p) : GET_OUT_PORT(this,p))
  
  #define PORT_IS_DSP(d,p) (p != 0 || d != SPA_DIRECTION_OUTPUT)
  
  static void emit_node_info(struct impl *this, bool full)
  {
  	if (full)
  		this->info.change_mask = this->info_all;
  	if (this->info.change_mask) {
  		spa_node_emit_info(&this->hooks, &this->info);
  		this->info.change_mask = 0;
  	}
  }
  
  static void emit_port_info(struct impl *this, struct port *port, bool full)
  {
  	if (full)
  		port->info.change_mask = port->info_all;
  	if (port->info.change_mask) {
  		struct spa_dict_item items[3];
  		uint32_t n_items = 0;
  
  		if (PORT_IS_DSP(port->direction, port->id)) {
  			items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_FORMAT_DSP, "32 bit float mono audio");
  			items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_AUDIO_CHANNEL, port->position);
  			if (port->direction == SPA_DIRECTION_OUTPUT)
  				items[n_items++] = SPA_DICT_ITEM_INIT(SPA_KEY_PORT_MONITOR, "1");
  		}
  		port->info.props = &SPA_DICT_INIT(items, n_items);
  
  		spa_node_emit_port_info(&this->hooks, port->direction, port->id, &port->info);
  		port->info.change_mask = 0;
  	}
  }
  
  static int init_port(struct impl *this, enum spa_direction direction, uint32_t port_id,
  		uint32_t rate, uint32_t position)
  {
  	struct port *port = GET_PORT(this, direction, port_id);
  
  	port->direction = direction;
  	port->id = port_id;
  
  	snprintf(port->position, 16, "%s", rindex(spa_type_audio_channel[position].name, ':')+1);
  
  	port->info_all = SPA_PORT_CHANGE_MASK_FLAGS |
  			SPA_PORT_CHANGE_MASK_PROPS |
  			SPA_PORT_CHANGE_MASK_PARAMS;
  	port->info = SPA_PORT_INFO_INIT();
  	port->info.flags = SPA_PORT_FLAG_NO_REF |
  		SPA_PORT_FLAG_DYNAMIC_DATA;
  	port->params[0] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
  	port->params[1] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
  	port->params[2] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
  	port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
  	port->params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
  	port->info.params = port->params;
  	port->info.n_params = 5;
  
  	port->n_buffers = 0;
  	port->have_format = false;
  	port->format.media_type = SPA_MEDIA_TYPE_audio;
  	port->format.media_subtype = SPA_MEDIA_SUBTYPE_raw;
  	port->format.info.raw.format = SPA_AUDIO_FORMAT_F32P;
  	port->format.info.raw.rate = rate;
  	port->format.info.raw.channels = 1;
  	port->format.info.raw.position[0] = position;
  	spa_list_init(&port->queue);
  
  	spa_log_debug(this->log, NAME " %p: add port %d:%d rate:%d position:%s",
  			this, direction, port_id, rate, port->position);
  	emit_port_info(this, port, true);
  
  	return 0;
  }
  
  static int impl_node_enum_params(void *object, int seq,
  				 uint32_t id, uint32_t start, uint32_t num,
  				 const struct spa_pod *filter)
  {
  	struct impl *this = object;
  	struct spa_pod *param;
  	struct spa_pod_builder b = { 0 };
  	uint8_t buffer[1024];
  	struct spa_result_node_params result;
  	uint32_t count = 0;
  
  	spa_return_val_if_fail(this != NULL, -EINVAL);
  	spa_return_val_if_fail(num != 0, -EINVAL);
  
  	result.id = id;
  	result.next = start;
        next:
  	result.index = result.next++;
  
  	spa_pod_builder_init(&b, buffer, sizeof(buffer));
  
  	switch (id) {
  	case SPA_PARAM_PortConfig:
  		return -ENOTSUP;
  	default:
  		return 0;
  	}
  
  	if (spa_pod_filter(&b, &result.param, param, filter) < 0)
  		goto next;
  
  	spa_node_emit_result(&this->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);
  
  	if (++count != num)
  		goto next;
  
  	return 0;
  }
  
  static int impl_node_set_io(void *object, uint32_t id, void *data, size_t size)
  {
  	return -ENOTSUP;
  }
  
  static int impl_node_set_param(void *object, uint32_t id, uint32_t flags,
  			       const struct spa_pod *param)
  {
  	struct impl *this = object;
  	int res;
  
  	spa_return_val_if_fail(this != NULL, -EINVAL);
  
  	switch (id) {
  	case SPA_PARAM_PortConfig:
  	{
  		struct spa_audio_info info = { 0, };
  		struct port *port;
  		struct spa_pod *format;
  		enum spa_direction direction;
  		enum spa_param_port_config_mode mode;
  		bool monitor = false;
  		uint32_t i;
  
  		if (spa_pod_parse_object(param,
  				SPA_TYPE_OBJECT_ParamPortConfig, NULL,
  				SPA_PARAM_PORT_CONFIG_direction,	SPA_POD_Id(&direction),
  				SPA_PARAM_PORT_CONFIG_mode,		SPA_POD_Id(&mode),
  				SPA_PARAM_PORT_CONFIG_monitor,		SPA_POD_OPT_Bool(&monitor),
  				SPA_PARAM_PORT_CONFIG_format,		SPA_POD_Pod(&format)) < 0)
  			return -EINVAL;
  
  		if (!spa_pod_is_object_type(format, SPA_TYPE_OBJECT_Format))
  			return -EINVAL;
  
  		if (mode != SPA_PARAM_PORT_CONFIG_MODE_dsp)
  			return -ENOTSUP;
  		if (direction != SPA_DIRECTION_INPUT)
  			return -EINVAL;
  
  		if ((res = spa_format_parse(format, &info.media_type, &info.media_subtype)) < 0)
  			return res;
  
  		if (info.media_type != SPA_MEDIA_TYPE_audio ||
  		    info.media_subtype != SPA_MEDIA_SUBTYPE_raw)
  			return -EINVAL;
  
  		if (spa_format_audio_raw_parse(format, &info.info.raw) < 0)
  			return -EINVAL;
  
  		port = GET_OUT_PORT(this, 0);
  		if (port->have_format && memcmp(&port->format, &info, sizeof(info)) == 0)
  			return 0;
  
  		spa_log_debug(this->log, NAME " %p: port config %d/%d %d", this,
  				info.info.raw.rate, info.info.raw.channels, monitor);
  
  		for (i = 0; i < this->port_count; i++) {
  			spa_node_emit_port_info(&this->hooks,
  					SPA_DIRECTION_INPUT, i, NULL);
  			if (this->monitor)
  				spa_node_emit_port_info(&this->hooks,
  						SPA_DIRECTION_OUTPUT, i+1, NULL);
  		}
  
  		port->have_format = true;
  		port->format = info;
  		this->monitor = monitor;
  
  		this->have_profile = true;
  		this->port_count = info.info.raw.channels;
  		this->monitor_count = this->monitor ? this->port_count : 0;
  		for (i = 0; i < this->port_count; i++) {
  			init_port(this, SPA_DIRECTION_INPUT, i, info.info.raw.rate,
  					info.info.raw.position[i]);
  			if (this->monitor)
  				init_port(this, SPA_DIRECTION_OUTPUT, i+1, info.info.raw.rate,
  					info.info.raw.position[i]);
  		}
  		return 0;
  	}
  	default:
  		return -ENOENT;
  	}
  	return 0;
  }
  
  static int impl_node_send_command(void *object, const struct spa_command *command)
  {
  	struct impl *this = object;
  
  	spa_return_val_if_fail(this != NULL, -EINVAL);
  	spa_return_val_if_fail(command != NULL, -EINVAL);
  
  	switch (SPA_NODE_COMMAND_ID(command)) {
  	case SPA_NODE_COMMAND_Start:
  		this->started = true;
  		break;
  	case SPA_NODE_COMMAND_Pause:
  		this->started = false;
  		break;
  	default:
  		return -ENOTSUP;
  	}
  	return 0;
  }
  
  static int
  impl_node_add_listener(void *object,
  		struct spa_hook *listener,
  		const struct spa_node_events *events,
  		void *data)
  {
  	struct impl *this = object;
  	uint32_t i;
  	struct spa_hook_list save;
  
  	spa_return_val_if_fail(this != NULL, -EINVAL);
  
  	spa_log_trace(this->log, NAME" %p: add listener %p", this, listener);
  	spa_hook_list_isolate(&this->hooks, &save, listener, events, data);
  
  	emit_node_info(this, true);
  	emit_port_info(this, GET_OUT_PORT(this, 0), true);
  	for (i = 0; i < this->port_count; i++) {
  		emit_port_info(this, GET_IN_PORT(this, i), true);
  		if (this->monitor)
  			emit_port_info(this, GET_OUT_PORT(this, i+1), true);
  	}
  
  	spa_hook_list_join(&this->hooks, &save);
  
  	return 0;
  }
  
  static int
  impl_node_set_callbacks(void *object,
  			const struct spa_node_callbacks *callbacks,
  			void *user_data)
  {
  	return 0;
  }
  
  static int impl_node_add_port(void *object, enum spa_direction direction, uint32_t port_id,
  		const struct spa_dict *props)
  {
  	return -ENOTSUP;
  }
  
  static int
  impl_node_remove_port(void *object, enum spa_direction direction, uint32_t port_id)
  {
  	return -ENOTSUP;
  }
  
  static int port_enum_formats(void *object,
  			     enum spa_direction direction, uint32_t port_id,
  			     uint32_t index,
  			     struct spa_pod **param,
  			     struct spa_pod_builder *builder)
  {
  	struct impl *this = object;
  	struct port *port = GET_PORT(this, direction, port_id);
  
  	switch (index) {
  	case 0:
  		if (PORT_IS_DSP(direction, port_id) || port->have_format) {
  			*param = spa_format_audio_raw_build(builder,
  				SPA_PARAM_EnumFormat, &port->format.info.raw);
  		}
  		else {
  			*param = spa_pod_builder_add_object(builder,
  				SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
  				SPA_FORMAT_mediaType,      SPA_POD_Id(SPA_MEDIA_TYPE_audio),
  				SPA_FORMAT_mediaSubtype,   SPA_POD_Id(SPA_MEDIA_SUBTYPE_raw),
  				SPA_FORMAT_AUDIO_format,   SPA_POD_CHOICE_ENUM_Id(13,
  							SPA_AUDIO_FORMAT_F32,
  							SPA_AUDIO_FORMAT_F32,
  							SPA_AUDIO_FORMAT_F32P,
  							SPA_AUDIO_FORMAT_S32,
  							SPA_AUDIO_FORMAT_S32P,
  							SPA_AUDIO_FORMAT_S24_32,
  							SPA_AUDIO_FORMAT_S24_32P,
  							SPA_AUDIO_FORMAT_S24,
  							SPA_AUDIO_FORMAT_S24P,
  							SPA_AUDIO_FORMAT_S16,
  							SPA_AUDIO_FORMAT_S16P,
  							SPA_AUDIO_FORMAT_U8,
  							SPA_AUDIO_FORMAT_U8P),
  				SPA_FORMAT_AUDIO_rate,     SPA_POD_CHOICE_RANGE_Int(
  					DEFAULT_RATE, 1, INT32_MAX),
  				SPA_FORMAT_AUDIO_channels, SPA_POD_CHOICE_RANGE_Int(
  					DEFAULT_CHANNELS, 1, MAX_PORTS));
  		}
  		break;
  	default:
  		return 0;
  	}
  	return 1;
  }
  
  static int
  impl_node_port_enum_params(void *object, int seq,
  			   enum spa_direction direction, uint32_t port_id,
  			   uint32_t id, uint32_t start, uint32_t num,
  			   const struct spa_pod *filter)
  {
  	struct impl *this = object;
  	struct port *port;
  	struct spa_pod *param;
  	struct spa_pod_builder b = { 0 };
  	uint8_t buffer[1024];
  	struct spa_result_node_params result;
  	uint32_t count = 0;
  	int res;
  
  	spa_return_val_if_fail(this != NULL, -EINVAL);
  	spa_return_val_if_fail(num != 0, -EINVAL);
  
  	spa_log_debug(this->log, "%p: enum params port %d.%d %d %u",
  			this, direction, port_id, seq, id);
  
  	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
  
  	port = GET_PORT(this, direction, port_id);
  
  	result.id = id;
  	result.next = start;
        next:
  	result.index = result.next++;
  
  	spa_pod_builder_init(&b, buffer, sizeof(buffer));
  
  	switch (id) {
  	case SPA_PARAM_EnumFormat:
  		if ((res = port_enum_formats(object, direction, port_id, result.index, &param, &b)) <= 0)
  			return res;
  		break;
  	case SPA_PARAM_Format:
  		if (!port->have_format)
  			return -EIO;
  		if (result.index > 0)
  			return 0;
  
  		param = spa_format_audio_raw_build(&b, id, &port->format.info.raw);
  		break;
  	case SPA_PARAM_Buffers:
  		if (!port->have_format)
  			return -EIO;
  		if (result.index > 0)
  			return 0;
  
  		param = spa_pod_builder_add_object(&b,
  			SPA_TYPE_OBJECT_ParamBuffers, id,
  			SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(1, 1, MAX_BUFFERS),
  			SPA_PARAM_BUFFERS_blocks,  SPA_POD_Int(port->blocks),
  			SPA_PARAM_BUFFERS_size,    SPA_POD_CHOICE_RANGE_Int(
  								MAX_SAMPLES * port->stride,
  								16 * port->stride,
  								INT32_MAX),
  			SPA_PARAM_BUFFERS_stride,  SPA_POD_Int(port->stride),
  			SPA_PARAM_BUFFERS_align,   SPA_POD_Int(16));
  		break;
  	case SPA_PARAM_Meta:
  		switch (result.index) {
  		case 0:
  			param = spa_pod_builder_add_object(&b,
  				SPA_TYPE_OBJECT_ParamMeta, id,
  				SPA_PARAM_META_type, SPA_POD_Id(SPA_META_Header),
  				SPA_PARAM_META_size, SPA_POD_Int(sizeof(struct spa_meta_header)));
  			break;
  		default:
  			return 0;
  		}
  		break;
  	case SPA_PARAM_IO:
  		switch (result.index) {
  		case 0:
  			param = spa_pod_builder_add_object(&b,
  				SPA_TYPE_OBJECT_ParamIO, id,
  				SPA_PARAM_IO_id,   SPA_POD_Id(SPA_IO_Buffers),
  				SPA_PARAM_IO_size, SPA_POD_Int(sizeof(struct spa_io_buffers)));
  			break;
  		default:
  			return 0;
  		}
  		break;
  	default:
  		return -ENOENT;
  	}
  
  	if (spa_pod_filter(&b, &result.param, param, filter) < 0)
  		goto next;
  
  	spa_node_emit_result(&this->hooks, seq, 0, SPA_RESULT_TYPE_NODE_PARAMS, &result);
  
  	if (++count != num)
  		goto next;
  
  	return 0;
  }
  
  static int clear_buffers(struct impl *this, struct port *port)
  {
  	if (port->n_buffers > 0) {
  		spa_log_debug(this->log, NAME " %p: clear buffers %p", this, port);
  		port->n_buffers = 0;
  		spa_list_init(&port->queue);
  	}
  	return 0;
  }
  
  static int setup_convert(struct impl *this)
  {
  	struct port *outport;
  	uint32_t src_fmt, dst_fmt;
  	int res;
  
  	outport = GET_OUT_PORT(this, 0);
  
  	src_fmt = SPA_AUDIO_FORMAT_F32P;
  	dst_fmt = outport->format.info.raw.format;
  
  	spa_log_info(this->log, NAME " %p: %s/%d@%dx%d->%s/%d@%d", this,
  			spa_debug_type_find_name(spa_type_audio_format, src_fmt),
  			1,
  			outport->format.info.raw.rate,
  			this->port_count,
  			spa_debug_type_find_name(spa_type_audio_format, dst_fmt),
  			outport->format.info.raw.channels,
  			outport->format.info.raw.rate);
  
  	this->conv.src_fmt = src_fmt;
  	this->conv.dst_fmt = dst_fmt;
  	this->conv.n_channels = outport->format.info.raw.channels;
  	this->conv.cpu_flags = this->cpu_flags;
  
  	if ((res = convert_init(&this->conv)) < 0)
  		return res;
  
  	spa_log_info(this->log, NAME " %p: got converter features %08x:%08x", this,
  			this->cpu_flags, this->conv.cpu_flags);
  
  	this->is_passthrough = src_fmt == dst_fmt;
  
  	return 0;
  }
  
  static int calc_width(struct spa_audio_info *info)
  {
  	switch (info->info.raw.format) {
  	case SPA_AUDIO_FORMAT_U8:
  		return 1;
  	case SPA_AUDIO_FORMAT_S16:
  	case SPA_AUDIO_FORMAT_S16_OE:
  		return 2;
  	case SPA_AUDIO_FORMAT_S24:
  	case SPA_AUDIO_FORMAT_S24_OE:
  		return 3;
  	default:
  		return 4;
  	}
  }
  
  static int port_set_format(void *object,
  			   enum spa_direction direction,
  			   uint32_t port_id,
  			   uint32_t flags,
  			   const struct spa_pod *format)
  {
  	struct impl *this = object;
  	struct port *port;
  	int res;
  
  	port = GET_PORT(this, direction, port_id);
  
  	spa_log_debug(this->log, NAME " %p: set format", this);
  
  	if (format == NULL) {
  		if (port->have_format) {
  			if (PORT_IS_DSP(direction, port_id))
  				port->have_format = false;
  			else
  				port->have_format = this->have_profile;
  			clear_buffers(this, port);
  		}
  	} else {
  		struct spa_audio_info info = { 0 };
  
  		if ((res = spa_format_parse(format, &info.media_type, &info.media_subtype)) < 0) {
  			spa_log_error(this->log, "can't parse format %s", spa_strerror(res));
  			return res;
  		}
  
  		if (info.media_type != SPA_MEDIA_TYPE_audio ||
  		    info.media_subtype != SPA_MEDIA_SUBTYPE_raw) {
  			spa_log_error(this->log, "unexpected types %d/%d",
  					info.media_type, info.media_subtype);
  			return -EINVAL;
  		}
  
  		if ((res = spa_format_audio_raw_parse(format, &info.info.raw)) < 0) {
  			spa_log_error(this->log, "can't parse format %s", spa_strerror(res));
  			return res;
  		}
  
  		if (PORT_IS_DSP(direction, port_id)) {
  			if (info.info.raw.rate != port->format.info.raw.rate) {
  				spa_log_error(this->log, "unexpected rate %d<->%d",
  					info.info.raw.rate, port->format.info.raw.rate);
  				return -EINVAL;
  			}
  			if (info.info.raw.format != SPA_AUDIO_FORMAT_F32P) {
  				spa_log_error(this->log, "unexpected format %d<->%d",
  					info.info.raw.format, SPA_AUDIO_FORMAT_F32P);
  				return -EINVAL;
  			}
  			if (info.info.raw.channels != 1) {
  				spa_log_error(this->log, "unexpected channels %d<->1",
  					info.info.raw.channels);
  				return -EINVAL;
  			}
  		}
  		else {
  			if (info.info.raw.channels != this->port_count) {
  				spa_log_error(this->log, "unexpected channels %d<->%d",
  					info.info.raw.channels, this->port_count);
  				return -EINVAL;
  			}
  		}
  
  		port->format = info;
  		port->stride = calc_width(&info);
  		if (SPA_AUDIO_FORMAT_IS_PLANAR(info.info.raw.format)) {
  			port->blocks = info.info.raw.channels;
  		}
  		else {
  			port->stride *= info.info.raw.channels;
  			port->blocks = 1;
  		}
  		spa_log_debug(this->log, NAME " %p: %d %d %d", this,
  				port_id, port->stride, port->blocks);
  
  		if (!PORT_IS_DSP(direction, port_id))
  			if ((res = setup_convert(this)) < 0)
  				return res;
  
  		port->have_format = true;
  	}
  
  	port->info.change_mask |= SPA_PORT_CHANGE_MASK_PARAMS;
  	if (port->have_format) {
  		port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_READWRITE);
  		port->params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, SPA_PARAM_INFO_READ);
  	} else {
  		port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
  		port->params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
  	}
  	emit_port_info(this, port, false);
  
  	return 0;
  }
  
  
  static int
  impl_node_port_set_param(void *object,
  			 enum spa_direction direction, uint32_t port_id,
  			 uint32_t id, uint32_t flags,
  			 const struct spa_pod *param)
  {
  	struct impl *this = object;
  
  	spa_return_val_if_fail(this != NULL, -EINVAL);
  
  	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
  
  	switch (id) {
  	case SPA_PARAM_Format:
  		return port_set_format(this, direction, port_id, flags, param);
  	default:
  		return -ENOENT;
  	}
  }
  
  static void queue_buffer(struct impl *this, struct port *port, uint32_t id)
  {
  	struct buffer *b = &port->buffers[id];
  
  	spa_log_trace_fp(this->log, NAME " %p: queue buffer %d on port %d %d",
  			this, id, port->id, b->flags);
  	if (SPA_FLAG_IS_SET(b->flags, BUFFER_FLAG_QUEUED))
  		return;
  
  	spa_list_append(&port->queue, &b->link);
  	SPA_FLAG_SET(b->flags, BUFFER_FLAG_QUEUED);
  }
  
  static struct buffer *dequeue_buffer(struct impl *this, struct port *port)
  {
  	struct buffer *b;
  
  	if (spa_list_is_empty(&port->queue))
  		return NULL;
  
  	b = spa_list_first(&port->queue, struct buffer, link);
  	spa_list_remove(&b->link);
  	SPA_FLAG_CLEAR(b->flags, BUFFER_FLAG_QUEUED);
  	spa_log_trace_fp(this->log, NAME " %p: dequeue buffer %d on port %d %u",
  			this, b->id, port->id, b->flags);
  
  	return b;
  }
  
  static int
  impl_node_port_use_buffers(void *object,
  			   enum spa_direction direction,
  			   uint32_t port_id,
  			   uint32_t flags,
  			   struct spa_buffer **buffers,
  			   uint32_t n_buffers)
  {
  	struct impl *this = object;
  	struct port *port;
  	uint32_t i, j;
  
  	spa_return_val_if_fail(this != NULL, -EINVAL);
  
  	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
  
  	port = GET_PORT(this, direction, port_id);
  
  	spa_return_val_if_fail(port->have_format, -EIO);
  
  	spa_log_debug(this->log, NAME " %p: use buffers %d on port %d:%d",
  			this, n_buffers, direction, port_id);
  
  	clear_buffers(this, port);
  
  	for (i = 0; i < n_buffers; i++) {
  		struct buffer *b;
  		uint32_t n_datas = buffers[i]->n_datas;
  		struct spa_data *d = buffers[i]->datas;
  
  		b = &port->buffers[i];
  		b->id = i;
  		b->flags = 0;
  		b->buf = buffers[i];
  
  		if (n_datas != port->blocks) {
  			spa_log_error(this->log, NAME " %p: invalid blocks %d on buffer %d",
  					this, n_datas, i);
  			return -EINVAL;
  		}
  
  		for (j = 0; j < n_datas; j++) {
  			if (d[j].data == NULL) {
  				spa_log_error(this->log, NAME " %p: invalid memory %d on buffer %d %d %p",
  						this, j, i, d[j].type, d[j].data);
  				return -EINVAL;
  			}
  			if (!SPA_IS_ALIGNED(d[j].data, MAX_ALIGN)) {
  				spa_log_warn(this->log, NAME " %p: memory %d on buffer %d not aligned",
  						this, j, i);
  			}
  			b->datas[j] = d[j].data;
  			if (direction == SPA_DIRECTION_OUTPUT &&
  			    !SPA_FLAG_IS_SET(d[j].flags, SPA_DATA_FLAG_DYNAMIC))
  				this->is_passthrough = false;
  		}
  
  		if (direction == SPA_DIRECTION_OUTPUT)
  			queue_buffer(this, port, i);
  	}
  	port->n_buffers = n_buffers;
  
  	return 0;
  }
  
  static int
  impl_node_port_set_io(void *object,
  		      enum spa_direction direction, uint32_t port_id,
  		      uint32_t id, void *data, size_t size)
  {
  	struct impl *this = object;
  	struct port *port;
  
  	spa_return_val_if_fail(this != NULL, -EINVAL);
  
  	spa_log_debug(this->log, NAME " %p: set io %d on port %d:%d %p",
  			this, id, direction, port_id, data);
  
  	spa_return_val_if_fail(CHECK_PORT(this, direction, port_id), -EINVAL);
  
  	port = GET_PORT(this, direction, port_id);
  
  	switch (id) {
  	case SPA_IO_Buffers:
  		port->io = data;
  		break;
  	default:
  		return -ENOENT;
  	}
  	return 0;
  }
  
  static int impl_node_port_reuse_buffer(void *object, uint32_t port_id, uint32_t buffer_id)
  {
  	struct impl *this = object;
  	struct port *port;
  
  	spa_return_val_if_fail(this != NULL, -EINVAL);
  
  	spa_return_val_if_fail(CHECK_PORT(this, SPA_DIRECTION_OUTPUT, port_id), -EINVAL);
  
  	port = GET_OUT_PORT(this, port_id);
  	queue_buffer(this, port, buffer_id);
  
  	return 0;
  }
  
  static inline int get_in_buffer(struct impl *this, struct port *port, struct buffer **buf)
  {
  	struct spa_io_buffers *io;
  
  	if ((io = port->io) == NULL) {
  		spa_log_trace_fp(this->log, NAME " %p: no io on port %d",
  				this, port->id);
  		return -EIO;
  	}
  	if (io->status != SPA_STATUS_HAVE_DATA ||
  	    io->buffer_id >= port->n_buffers) {
  		spa_log_trace_fp(this->log, NAME " %p: empty port %d %p %d %d %d",
  				this, port->id, io, io->status, io->buffer_id,
  				port->n_buffers);
  		return -EPIPE;
  	}
  
  	*buf = &port->buffers[io->buffer_id];
  	io->status = SPA_STATUS_NEED_DATA;
  
  	return 0;
  }
  
  static inline int get_out_buffer(struct impl *this, struct port *port, struct buffer **buf)
  {
  	struct spa_io_buffers *io;
  
  	if ((io = port->io) == NULL ||
  	    io->status == SPA_STATUS_HAVE_DATA)
  		return SPA_STATUS_HAVE_DATA;
  
  	if (io->buffer_id < port->n_buffers)
  		queue_buffer(this, port, io->buffer_id);
  
  	if ((*buf = dequeue_buffer(this, port)) == NULL)
  		return -EPIPE;
  
  	io->status = SPA_STATUS_HAVE_DATA;
  	io->buffer_id = (*buf)->id;
  
  	return 0;
  }
  
  static inline int handle_monitor(struct impl *this, const void *data, int n_samples, struct port *outport)
  {
  	struct buffer *dbuf;
          struct spa_data *dd;
  	int res, size;
  
  	if ((res = get_out_buffer(this, outport, &dbuf)) != 0)
  		return res;
  
  	dd = &dbuf->buf->datas[0];
  	size = SPA_MIN(dd->maxsize, n_samples * outport->stride);
  	dd->chunk->offset = 0;
  	dd->chunk->size = size;
  
  	spa_log_trace(this->log, "%p: io %p %08x", this, outport->io, dd->flags);
  
  	if (SPA_FLAG_IS_SET(dd->flags, SPA_DATA_FLAG_DYNAMIC))
  		dd->data = (void*)data;
  	else
  		spa_memcpy(dd->data, data, size);
  
  	return res;
  }
  
  static int impl_node_process(void *object)
  {
  	struct impl *this = object;
  	struct port *outport;
  	struct spa_io_buffers *outio;
  	uint32_t i, maxsize, n_samples;
  	struct spa_data *sd, *dd;
  	struct buffer *sbuf, *dbuf;
  	uint32_t n_src_datas, n_dst_datas;
  	const void **src_datas;
  	void **dst_datas;
  	int res = 0;
  
  	spa_return_val_if_fail(this != NULL, -EINVAL);
  
  	outport = GET_OUT_PORT(this, 0);
  	outio = outport->io;
  	spa_return_val_if_fail(outio != NULL, -EIO);
  	spa_return_val_if_fail(this->conv.process != NULL, -EIO);
  
  	spa_log_trace_fp(this->log, NAME " %p: status %p %d %d", this,
  			outio, outio->status, outio->buffer_id);
  
  	if ((res = get_out_buffer(this, outport, &dbuf)) != 0)
  		return res;
  
  	dd = &dbuf->buf->datas[0];
  
  	maxsize = dd->maxsize;
  	n_samples = maxsize / outport->stride;
  
  	src_datas = alloca(sizeof(void*) * this->port_count);
  
  	n_dst_datas = dbuf->buf->n_datas;
  	dst_datas = alloca(sizeof(void*) * n_dst_datas);
  
  	/* produce more output if possible */
  	n_src_datas = 0;
  	for (i = 0; i < this->port_count; i++) {
  		struct port *inport = GET_IN_PORT(this, i);
  
  		if (get_in_buffer(this, inport, &sbuf) < 0) {
  			src_datas[n_src_datas++] = SPA_PTR_ALIGN(this->empty, MAX_ALIGN, void);
  			continue;
  		}
  
  		sd = &sbuf->buf->datas[0];
  
  		src_datas[n_src_datas++] = SPA_MEMBER(sd->data, sd->chunk->offset, void);
  
  		n_samples = SPA_MIN(n_samples, sd->chunk->size / inport->stride);
  
  		spa_log_trace_fp(this->log, NAME " %p: %d %d %d %p", this,
  				sd->chunk->size, maxsize, n_samples, src_datas[i]);
  
  		SPA_FLAG_SET(res, SPA_STATUS_NEED_DATA);
  	}
  
  	for (i = 0; i < this->monitor_count; i++)
  		handle_monitor(this, src_datas[i], n_samples, GET_OUT_PORT(this, i + 1));
  
  	for (i = 0; i < n_dst_datas; i++) {
  		dst_datas[i] = this->is_passthrough ? (void*)src_datas[i] : dbuf->datas[i];
  		dbuf->buf->datas[i].data = dst_datas[i];
  		dbuf->buf->datas[i].chunk->offset = 0;
  		dbuf->buf->datas[i].chunk->size = n_samples * outport->stride;
  		spa_log_trace_fp(this->log, NAME " %p %p %d", this, dst_datas[i],
  				n_samples * outport->stride);
  	}
  	if (!this->is_passthrough)
  		convert_process(&this->conv, dst_datas, src_datas, n_samples);
  
  	return res | SPA_STATUS_HAVE_DATA;
  }
  
  static const struct spa_node_methods impl_node = {
  	SPA_VERSION_NODE_METHODS,
  	.add_listener = impl_node_add_listener,
  	.set_callbacks = impl_node_set_callbacks,
  	.enum_params = impl_node_enum_params,
  	.set_param = impl_node_set_param,
  	.set_io = impl_node_set_io,
  	.send_command = impl_node_send_command,
  	.add_port = impl_node_add_port,
  	.remove_port = impl_node_remove_port,
  	.port_enum_params = impl_node_port_enum_params,
  	.port_set_param = impl_node_port_set_param,
  	.port_use_buffers = impl_node_port_use_buffers,
  	.port_set_io = impl_node_port_set_io,
  	.port_reuse_buffer = impl_node_port_reuse_buffer,
  	.process = impl_node_process,
  };
  
  static int impl_get_interface(struct spa_handle *handle, uint32_t type, void **interface)
  {
  	struct impl *this;
  
  	spa_return_val_if_fail(handle != NULL, -EINVAL);
  	spa_return_val_if_fail(interface != NULL, -EINVAL);
  
  	this = (struct impl *) handle;
  
  	if (type == SPA_TYPE_INTERFACE_Node)
  		*interface = &this->node;
  	else
  		return -ENOENT;
  
  	return 0;
  }
  
  static int impl_clear(struct spa_handle *handle)
  {
  	return 0;
  }
  
  static size_t
  impl_get_size(const struct spa_handle_factory *factory,
  	      const struct spa_dict *params)
  {
  	return sizeof(struct impl);
  }
  
  static int
  impl_init(const struct spa_handle_factory *factory,
  	  struct spa_handle *handle,
  	  const struct spa_dict *info,
  	  const struct spa_support *support,
  	  uint32_t n_support)
  {
  	struct impl *this;
  	struct port *port;
  	uint32_t i;
  
  	spa_return_val_if_fail(factory != NULL, -EINVAL);
  	spa_return_val_if_fail(handle != NULL, -EINVAL);
  
  	handle->get_interface = impl_get_interface;
  	handle->clear = impl_clear;
  
  	this = (struct impl *) handle;
  
  	for (i = 0; i < n_support; i++) {
  		switch (support[i].type) {
  		case SPA_TYPE_INTERFACE_Log:
  			this->log = support[i].data;
  			break;
  		case SPA_TYPE_INTERFACE_CPU:
  			this->cpu = support[i].data;
  			break;
  		}
  	}
  
  	if (this->cpu)
  		this->cpu_flags = spa_cpu_get_flags(this->cpu);
  
  	this->node.iface = SPA_INTERFACE_INIT(
  			SPA_TYPE_INTERFACE_Node,
  			SPA_VERSION_NODE,
  			&impl_node, this);
  	spa_hook_list_init(&this->hooks);
  
  	this->info_all = SPA_NODE_CHANGE_MASK_FLAGS |
  			SPA_NODE_CHANGE_MASK_PARAMS;
  	this->info = SPA_NODE_INFO_INIT();
  	this->info.max_input_ports = MAX_PORTS;
  	this->info.max_output_ports = MAX_PORTS+1;
  	this->info.flags = SPA_NODE_FLAG_RT;
  	this->params[0] = SPA_PARAM_INFO(SPA_PARAM_PortConfig, SPA_PARAM_INFO_WRITE);
  	this->info.params = this->params;
  	this->info.n_params = 1;
  
  	port = GET_OUT_PORT(this, 0);
  	port->direction = SPA_DIRECTION_OUTPUT;
  	port->id = 0;
  	port->info_all = SPA_PORT_CHANGE_MASK_FLAGS |
  			SPA_PORT_CHANGE_MASK_PARAMS;
  	port->info = SPA_PORT_INFO_INIT();
  	port->info.flags = SPA_PORT_FLAG_DYNAMIC_DATA;
  	port->params[0] = SPA_PARAM_INFO(SPA_PARAM_EnumFormat, SPA_PARAM_INFO_READ);
  	port->params[1] = SPA_PARAM_INFO(SPA_PARAM_Meta, SPA_PARAM_INFO_READ);
  	port->params[2] = SPA_PARAM_INFO(SPA_PARAM_IO, SPA_PARAM_INFO_READ);
  	port->params[3] = SPA_PARAM_INFO(SPA_PARAM_Format, SPA_PARAM_INFO_WRITE);
  	port->params[4] = SPA_PARAM_INFO(SPA_PARAM_Buffers, 0);
  	port->info.params = port->params;
  	port->info.n_params = 5;
  	spa_list_init(&port->queue);
  
  	return 0;
  }
  
  static const struct spa_interface_info impl_interfaces[] = {
  	{SPA_TYPE_INTERFACE_Node,},
  };
  
  static int
  impl_enum_interface_info(const struct spa_handle_factory *factory,
  			 const struct spa_interface_info **info,
  			 uint32_t *index)
  {
  	spa_return_val_if_fail(factory != NULL, -EINVAL);
  	spa_return_val_if_fail(info != NULL, -EINVAL);
  	spa_return_val_if_fail(index != NULL, -EINVAL);
  
  	switch (*index) {
  	case 0:
  		*info = &impl_interfaces[*index];
  		break;
  	default:
  		return 0;
  	}
  	(*index)++;
  	return 1;
  }
  
  const struct spa_handle_factory spa_merger_factory = {
  	SPA_VERSION_HANDLE_FACTORY,
  	SPA_NAME_AUDIO_PROCESS_INTERLEAVE,
  	NULL,
  	impl_get_size,
  	impl_init,
  	impl_enum_interface_info,
  };
  