switch.c

linux下的MPEG1

/*
 * Copyright (C) 2000-2004 the xine project
 * 
 * This file is part of xine, a free video player.
 * 
 * xine 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.
 * 
 * xine 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
 *
 * $Id: switch.c,v 1.18 2006/07/10 22:08:44 dgp85 Exp $
 */
 
/*
 * simple switch video post plugin
 */

#define LOG_MODULE "switch"
#define LOG_VERBOSE
/*
#define LOG
*/

#include "xine_internal.h"
#include "post.h"

/* FIXME: This plugin needs to handle overlays as well. */

/* plugin class initialization function */
static void *switch_init_plugin(xine_t *xine, void *);

/* plugin catalog information */
static const post_info_t switch_special_info = { XINE_POST_TYPE_VIDEO_COMPOSE };

const plugin_info_t xine_plugin_info[] EXPORTED = {
  /* type, API, "name", version, special_info, init_function */  
  { PLUGIN_POST, 9, "switch", XINE_VERSION_CODE, &switch_special_info, &switch_init_plugin },
  { PLUGIN_NONE, 0, "", 0, NULL, NULL }
};

typedef struct switch_parameter_s {
  unsigned int select;
} switch_parameter_t;


START_PARAM_DESCR(switch_parameter_t)
PARAM_ITEM(POST_PARAM_TYPE_INT, select, NULL, 1, INT_MAX, 1,
  "the input source which will be passed through to the output")
END_PARAM_DESCR(switch_param_descr)

typedef struct post_class_switch_s post_class_switch_t;
typedef struct post_switch_s post_switch_t;

struct post_class_switch_s {
  post_class_t  class;
  xine_t       *xine;
};

/* plugin structure */
struct post_switch_s {
  post_plugin_t    post;
  xine_post_in_t   parameter_input;
  
  int64_t          vpts_limit;
  pthread_cond_t   display_condition_changed;
  int64_t          skip_vpts;
  int              skip;
  pthread_mutex_t  mutex;
  unsigned int     source_count;
  unsigned int     selected_source;
};


/* plugin class functions */
static post_plugin_t *switch_open_plugin(post_class_t *class_gen, int inputs,
					 xine_audio_port_t **audio_target,
					 xine_video_port_t **video_target);
static char          *switch_get_identifier(post_class_t *class_gen);
static char          *switch_get_description(post_class_t *class_gen);
static void           switch_class_dispose(post_class_t *class_gen);

/* plugin instance functions */
static void           switch_dispose(post_plugin_t *this_gen);

/* parameter functions */
static xine_post_api_descr_t *switch_get_param_descr(void);
static int            switch_set_parameters(xine_post_t *this_gen, void *param_gen);
static int            switch_get_parameters(xine_post_t *this_gen, void *param_gen);
static char          *switch_get_help(void);

/* replaced vo_frame functions */
static int            switch_draw(vo_frame_t *frame, xine_stream_t *stream);


static void *switch_init_plugin(xine_t *xine, void *data)
{
  post_class_switch_t *this = (post_class_switch_t *)xine_xmalloc(sizeof(post_class_switch_t));

  if (!this)
    return NULL;
  
  this->class.open_plugin     = switch_open_plugin;
  this->class.get_identifier  = switch_get_identifier;
  this->class.get_description = switch_get_description;
  this->class.dispose         = switch_class_dispose;
  this->xine                  = xine;

  return &this->class;
}

static post_plugin_t *switch_open_plugin(post_class_t *class_gen, int inputs,
					 xine_audio_port_t **audio_target,
					 xine_video_port_t **video_target)
{
  post_switch_t     *this = (post_switch_t *)xine_xmalloc(sizeof(post_switch_t));
  post_in_t         *input;
  xine_post_in_t    *input_api;
  post_out_t        *output;
  post_video_port_t *port;
  static xine_post_api_t post_api =
    { switch_set_parameters, switch_get_parameters, switch_get_param_descr, switch_get_help };
  int i;
    
  lprintf("switch open\n");

  if (inputs < 2 || !this || !video_target || !video_target[0]) {
    free(this);
    return NULL;
  }
  
  _x_post_init(&this->post, 0, inputs);

  this->source_count    = inputs;
  this->selected_source = 1;
  
  pthread_cond_init(&this->display_condition_changed, NULL);
  pthread_mutex_init(&this->mutex, NULL);
  
  port = _x_post_intercept_video_port(&this->post, video_target[0], &input, &output);
  port->new_frame->draw = switch_draw;
  port->port_lock       = &this->mutex;
  port->frame_lock      = &this->mutex;
  this->post.xine_post.video_input[0] = &port->new_port;
  
  for (i = 1; i < inputs; i++) {
    port = _x_post_intercept_video_port(&this->post, video_target[0], &input, NULL);
    port->new_frame->draw = switch_draw;
    port->port_lock       = &this->mutex;
    port->frame_lock      = &this->mutex;
    this->post.xine_post.video_input[i] = &port->new_port;
  }
  
  input_api       = &this->parameter_input;
  input_api->name = "parameters";
  input_api->type = XINE_POST_DATA_PARAMETERS;
  input_api->data = &post_api;
  xine_list_push_back(this->post.input, input_api);

  this->post.dispose = switch_dispose;

  return &this->post;
}

static char *switch_get_identifier(post_class_t *class_gen)
{
  return "switch";
}

static char *switch_get_description(post_class_t *class_gen)
{
  return "Switch is a post plugin able to switch at any time between different streams";
}

static void switch_class_dispose(post_class_t *class_gen)
{
  free(class_gen);
}


static void switch_dispose(post_plugin_t *this_gen)
{
  post_switch_t *this = (post_switch_t *)this_gen;
  
  if (_x_post_dispose(this_gen)) {
    pthread_cond_destroy(&this->display_condition_changed);
    pthread_mutex_destroy(&this->mutex);
    free(this);
  }
}


static xine_post_api_descr_t *switch_get_param_descr(void)
{
  return &switch_param_descr;
}

static int switch_set_parameters(xine_post_t *this_gen, void *param_gen)
{
  post_switch_t *this = (post_switch_t *)this_gen;
  switch_parameter_t *param = (switch_parameter_t *)param_gen;
  
  if (param->select > this->source_count) return 0;
  pthread_mutex_lock(&this->mutex);
  this->selected_source = param->select;
  pthread_mutex_unlock(&this->mutex);
  pthread_cond_broadcast(&this->display_condition_changed);
  return 1;
}

static int switch_get_parameters(xine_post_t *this_gen, void *param_gen)
{
  post_switch_t *this = (post_switch_t *)this_gen;
  switch_parameter_t *param = (switch_parameter_t *)param_gen;
  
  param->select = this->selected_source;
  return 1;
}

static char *switch_get_help(void)
{
  return _("Switch can be used for fast switching between multiple inputs.\n"
	   "\n"
	   "Parameters\n"
	   "  select: the number of the input which will be passed to the output\n");
}


static int switch_draw(vo_frame_t *frame, xine_stream_t *stream)
{
  post_video_port_t *port = (post_video_port_t *)frame->port;
  post_switch_t *this = (post_switch_t *)port->post;
  int source_num, skip;

  for (source_num = 1; source_num <= this->source_count; source_num++)
    if (this->post.xine_post.video_input[source_num-1] == frame->port) break;
  _x_assert(source_num <= this->source_count);
  
  pthread_mutex_lock(&this->mutex);
  /* the original output will probably never see this frame again */
  _x_post_frame_u_turn(frame, stream);
  while (this->selected_source != source_num &&
      (frame->vpts > this->vpts_limit || !this->vpts_limit))
    /* we are too early */
    pthread_cond_wait(&this->display_condition_changed, &this->mutex);
  if (this->selected_source == source_num) {
    _x_post_frame_copy_down(frame, frame->next);
    skip = frame->next->draw(frame->next, XINE_ANON_STREAM);
    _x_post_frame_copy_up(frame, frame->next);
    this->vpts_limit = frame->vpts + frame->duration;
    if (skip) {
      this->skip      = skip;
      this->skip_vpts = frame->vpts;
    } else
      this->skip      = 0;
    pthread_mutex_unlock(&this->mutex);
    pthread_cond_broadcast(&this->display_condition_changed);
  } else {
    if (this->skip && frame->vpts <= this->skip_vpts)
      skip = this->skip;
    else
      skip = 0;
    pthread_mutex_unlock(&this->mutex);
  }
  
  return skip;
}