dvdnav.c

linux下的MPEG1

	  /* no active cell still -> get us to the next cell */
	  vm_get_next_cell(this->vm);
	  this->position_current.still = 0; /* still gets activated at end of cell */
	  this->skip_still = 0;
	  this->sync_wait_skip = 0;
	}
      }
      /* handle related state changes in next iteration */
      (*event) = DVDNAV_NOP;
      (*len) = 0;
      pthread_mutex_unlock(&this->vm_lock); 
      return DVDNAV_STATUS_OK;
    }

    /* Perform remapping jump if necessary (this is always a 
     * VOBU boundary). */
    if (this->vm->map) {
      this->vobu.vobu_next = remap_block( this->vm->map,
        this->vm->state.domain, this->vm->state.TTN_REG,
        this->vm->state.pgN,
        this->vobu.vobu_start, this->vobu.vobu_next);
    }

    /* at the start of the next VOBU -> expecting NAV packet */
    result = dvdnav_read_cache_block(this->cache, this->vobu.vobu_start + this->vobu.vobu_next, 1, buf);

    if(result <= 0) {
      printerr("Error reading NAV packet.");
      pthread_mutex_unlock(&this->vm_lock); 
      return DVDNAV_STATUS_ERR;
    }
    /* Decode nav into pci and dsi. Then get next VOBU info. */
    if(!dvdnav_decode_packet(this, *buf, &this->dsi, &this->pci)) {
      printerr("Expected NAV packet but none found.");
      pthread_mutex_unlock(&this->vm_lock); 
      return DVDNAV_STATUS_ERR;
    }
    /* We need to update the vm state->blockN with which VOBU we are in.
     * This is so RSM resumes to the VOBU level and not just the CELL level.
     */
    this->vm->state.blockN = this->vobu.vobu_start - this->position_current.cell_start;

    dvdnav_get_vobu(this, &this->dsi, &this->pci, &this->vobu); 
    this->vobu.blockN = 0;
    /* Give the cache a hint about the size of next VOBU.
     * This improves pre-caching, because the VOBU will almost certainly be read entirely.
     */
    dvdnav_pre_cache_blocks(this->cache, this->vobu.vobu_start+1, this->vobu.vobu_length+1);
    
    /* release NAV menu filter, when we reach the same NAV packet again */
    if (this->last_cmd_nav_lbn == this->pci.pci_gi.nv_pck_lbn)
      this->last_cmd_nav_lbn = SRI_END_OF_CELL;
    
    /* Successfully got a NAV packet */
    (*event) = DVDNAV_NAV_PACKET;
#ifdef LOG_DEBUG
    fprintf(MSG_OUT, "libdvdnav: NAV_PACKET\n");
#endif
    (*len) = 2048; 
    pthread_mutex_unlock(&this->vm_lock); 
    return DVDNAV_STATUS_OK;
  }
  
  /* If we've got here, it must just be a normal block. */
  if(!this->file) {
    printerr("Attempting to read without opening file.");
    pthread_mutex_unlock(&this->vm_lock); 
    return DVDNAV_STATUS_ERR;
  }

  this->vobu.blockN++;
  result = dvdnav_read_cache_block(this->cache, this->vobu.vobu_start + this->vobu.blockN, 1, buf);
  if(result <= 0) {
    printerr("Error reading from DVD.");
    pthread_mutex_unlock(&this->vm_lock); 
    return DVDNAV_STATUS_ERR;
  }
  (*event) = DVDNAV_BLOCK_OK;
  (*len) = 2048;

  pthread_mutex_unlock(&this->vm_lock); 
  return DVDNAV_STATUS_OK;
}

dvdnav_status_t dvdnav_get_title_string(dvdnav_t *this, const char **title_str) {
  
  if(!this || !title_str) {
    printerr("Passed a NULL pointer.");
    return DVDNAV_STATUS_ERR;
  }

  (*title_str) = this->vm->dvd_name;
  return DVDNAV_STATUS_OK;
}

uint8_t dvdnav_get_video_aspect(dvdnav_t *this) {
  uint8_t         retval;
  
  if(!this) {
    printerr("Passed a NULL pointer.");
    return -1;
  }
  if(!this->started) {
    printerr("Virtual DVD machine not started.");
    return -1;
  }

  pthread_mutex_lock(&this->vm_lock);
  retval = (uint8_t)vm_get_video_aspect(this->vm);
  pthread_mutex_unlock(&this->vm_lock);
  
  return retval;
}

uint8_t dvdnav_get_video_scale_permission(dvdnav_t *this) {
  uint8_t         retval;
  
  if(!this) {
    printerr("Passed a NULL pointer.");
    return -1;
  }
  if(!this->started) {
    printerr("Virtual DVD machine not started.");
    return -1;
  }
  
  pthread_mutex_lock(&this->vm_lock);
  retval = (uint8_t)vm_get_video_scale_permission(this->vm);
  pthread_mutex_unlock(&this->vm_lock);
  
  return retval;
}

uint16_t dvdnav_audio_stream_to_lang(dvdnav_t *this, uint8_t stream) {
  audio_attr_t  attr;
  
  if(!this) {
    printerr("Passed a NULL pointer.");
    return -1;
  }
  if(!this->started) {
    printerr("Virtual DVD machine not started.");
    return -1;
  }
  
  pthread_mutex_lock(&this->vm_lock); 
  attr = vm_get_audio_attr(this->vm, stream);
  pthread_mutex_unlock(&this->vm_lock); 
  
  if(attr.lang_type != 1)
    return 0xffff;
  
  return attr.lang_code;
}

uint16_t dvdnav_spu_stream_to_lang(dvdnav_t *this, uint8_t stream) {
  subp_attr_t  attr;
  
  if(!this) {
    printerr("Passed a NULL pointer.");
    return -1;
  }
  if(!this->started) {
    printerr("Virtual DVD machine not started.");
    return -1;
  }
  
  pthread_mutex_lock(&this->vm_lock); 
  attr = vm_get_subp_attr(this->vm, stream);
  pthread_mutex_unlock(&this->vm_lock); 
  
  if(attr.type != 1)
    return 0xffff;
  
  return attr.lang_code;
}

int8_t dvdnav_get_audio_logical_stream(dvdnav_t *this, uint8_t audio_num) {
  int8_t       retval;
  
  if(!this) {
    printerr("Passed a NULL pointer.");
    return -1;
  }
  if(!this->started) {
    printerr("Virtual DVD machine not started.");
    return -1;
  }
  
  pthread_mutex_lock(&this->vm_lock);
  if (!this->vm->state.pgc) {
    printerr("No current PGC.");
    pthread_mutex_unlock(&this->vm_lock); 
    return -1;
  }
  retval = vm_get_audio_stream(this->vm, audio_num);
  pthread_mutex_unlock(&this->vm_lock); 

  return retval;
}

int8_t dvdnav_get_spu_logical_stream(dvdnav_t *this, uint8_t subp_num) {
  int8_t       retval;

  if(!this) {
    printerr("Passed a NULL pointer.");
    return -1;
  }
  if(!this->started) {
    printerr("Virtual DVD machine not started.");
    return -1;
  }

  pthread_mutex_lock(&this->vm_lock);
  if (!this->vm->state.pgc) {
    printerr("No current PGC.");
    pthread_mutex_unlock(&this->vm_lock); 
    return -1;
  }
  retval = vm_get_subp_stream(this->vm, subp_num, 0);
  pthread_mutex_unlock(&this->vm_lock);

  return retval;
}

int8_t dvdnav_get_active_audio_stream(dvdnav_t *this) {
  int8_t        retval;

  if(!this) {
    printerr("Passed a NULL pointer.");
    return -1;
  }
  if(!this->started) {
    printerr("Virtual DVD machine not started.");
    return -1;
  }
  
  pthread_mutex_lock(&this->vm_lock); 
  if (!this->vm->state.pgc) {
    printerr("No current PGC.");
    pthread_mutex_unlock(&this->vm_lock); 
    return -1;
  }
  retval = vm_get_audio_active_stream(this->vm);
  pthread_mutex_unlock(&this->vm_lock); 
  
  return retval;
}

int8_t dvdnav_get_active_spu_stream(dvdnav_t *this) {
  int8_t        retval;

  if(!this) {
    printerr("Passed a NULL pointer.");
    return -1;
  }
  if(!this->started) {
    printerr("Virtual DVD machine not started.");
    return -1;
  }
  
  pthread_mutex_lock(&this->vm_lock); 
  if (!this->vm->state.pgc) {
    printerr("No current PGC.");
    pthread_mutex_unlock(&this->vm_lock); 
    return -1;
  }
  retval = vm_get_subp_active_stream(this->vm, 0);
  pthread_mutex_unlock(&this->vm_lock); 
  
  return retval;
}

static int8_t dvdnav_is_domain(dvdnav_t *this, domain_t domain) {
  int8_t        retval;
  
  if(!this) {
    printerr("Passed a NULL pointer.");
    return -1;
  }
  if(!this->started) {
    printerr("Virtual DVD machine not started.");
    return -1;
  }
  
  pthread_mutex_lock(&this->vm_lock);
  retval = (this->vm->state.domain == domain);
  pthread_mutex_unlock(&this->vm_lock);
  
  return retval;
}

/* First Play domain. (Menu) */
int8_t dvdnav_is_domain_fp(dvdnav_t *this) {
  return dvdnav_is_domain(this, FP_DOMAIN);
}
/* Video management Menu domain. (Menu) */
int8_t dvdnav_is_domain_vmgm(dvdnav_t *this) {
  return dvdnav_is_domain(this, VMGM_DOMAIN);
}
/* Video Title Menu domain (Menu) */
int8_t dvdnav_is_domain_vtsm(dvdnav_t *this) {
  return dvdnav_is_domain(this, VTSM_DOMAIN);
}
/* Video Title domain (playing movie). */
int8_t dvdnav_is_domain_vts(dvdnav_t *this) { 
  return dvdnav_is_domain(this, VTS_DOMAIN);
}

/* Generally delegate angle information handling to VM */
dvdnav_status_t dvdnav_angle_change(dvdnav_t *this, int32_t angle) {
  int32_t num, current;
  
  if(!this) {
    printerr("Passed a NULL pointer.");
    return DVDNAV_STATUS_ERR;
  }

  pthread_mutex_lock(&this->vm_lock);
  vm_get_angle_info(this->vm, &current, &num);
  /* Set angle SPRM if valid */
  if((angle > 0) && (angle <= num)) {
    this->vm->state.AGL_REG = angle;
  } else {
    printerr("Passed an invalid angle number.");
    pthread_mutex_unlock(&this->vm_lock);
    return DVDNAV_STATUS_ERR;
  }
  pthread_mutex_unlock(&this->vm_lock);

  return DVDNAV_STATUS_OK;
}

dvdnav_status_t dvdnav_get_angle_info(dvdnav_t *this, int32_t *current_angle,
				      int32_t *number_of_angles) {
  if(!this || !current_angle || !number_of_angles) {
    printerr("Passed a NULL pointer.");
    return DVDNAV_STATUS_ERR;
  }

  pthread_mutex_lock(&this->vm_lock);
  vm_get_angle_info(this->vm, current_angle, number_of_angles);
  pthread_mutex_unlock(&this->vm_lock);

  return DVDNAV_STATUS_OK;
}

pci_t* dvdnav_get_current_nav_pci(dvdnav_t *this) {
  if(!this) return 0;
  return &this->pci;
}

dsi_t* dvdnav_get_current_nav_dsi(dvdnav_t *this) {
  if(!this) return 0;
  return &this->dsi;
}

uint32_t dvdnav_get_next_still_flag(dvdnav_t *this) {
  if(!this) return -1;
  return this->position_next.still;
}