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用php将动态gif拆分成单帧

时间：2021-07-01 10:21:17 帮助过：29人阅读

我想把一个动态gif拆分成一帧一帧的然后对单帧进行修改后再合并起来在网上找了一段代码但是在拆分成单帧的时候就出了问题但是不知道错在哪里了请各位大虾帮忙看看代码如下

buffer, 0, $len);
    $this->buffer = substr($this->buffer, $len);
    if($len == 1)
        return ord($ch);
    return $ch;
  }

  /**
   * 内部方法 get_number
   * 从图片数据缓冲区读取一个整数
   * 参数 无
   * 返回 整数
   **/
  function get_number() {
    $t = unpack("Sn", $this->next(2));
    return $t['n'];
  }

  /**
   * 构造函数
   * 参数 $imagename 字符串，图片文件名或图片数据
   * 返回 无
   **/
  function TGif($imagename="images/xzn.gif") {
    $this->image = array();
    $this->frame = 0;
    if(is_file($imagename)) {
        $this->imagename = $imagename;
        $this->buffer = @file_get_contents($imagename)
            or trigger_error("$imagename 打不开", E_USER_ERROR);
    }else {
        substr($imagename, 0, 3) == 'GIF' or
            trigger_error("$imagename 不存在或不是GIF格式图片", E_USER_ERROR);
        $this->buffer = $imagename;
        $this->imagename = '未命名';
    }
    $this->get_header();
    while(strlen($this->buffer)) {
        switch($this->next()) {
            case 0x21: //图象扩展描述符
                $this->get_extension_introducer();
                break;
            case 0x2c: //图象描述符
                $this->get_image_descriptor();
                break;
            case 0x3b: //GIF数据流结束
                return;
        }
    }
  }

  /**
   * 内部方法 get_color_table
   * 读取调色板数据
   **/
  function get_color_table($num) {
    return $this->next(3*pow(2,$num+1));
  }

  /**
   * 内部方法 get_header
   * 读取头信息
   **/
  function get_header() {
    $this->signature = $this->next(3);    //类型标识gif
    if($this->signature != 'GIF')
        trigger_error("$this->imagename 不是GIF格式图片", E_USER_ERROR);
    $this->version = $this->next(3);    //版本标识
    $this->logical_screen_width = $this->get_number();    //逻辑屏幕宽
    $this->logical_screen_height = $this->get_number();    //逻辑屏幕高
    $this->flag = $flag = $this->next();
    $this->global_color_table_flag = ($flag & 0x80) > 0;    //是否有全局调色板
    $this->color_resolution = (($flag >> 4) & 0x07) + 1;    //彩色分辨率
    $this->sort_flag = ($flag & 0x08) > 0;            //调色板是否排序
    $this->size_of_global_color_table = $flag & 0x07;    //全局色板大小，2的乘方的指数
    $this->background_color_index = $this->next();        //背景色索引
    $this->pixel_aspect_ratio = $this->next();         //像素纵横比
    if($this->global_color_table_flag)
        $this->global_color_table = $this->get_color_table($this->size_of_global_color_table);
  }

  /**
   * 内部方法 get_image_descriptor
   * 读取图片信息
   **/
  function get_image_descriptor() {
    $image['left_position'] = $this->get_number();
    $image['top_position'] = $this->get_number();
    $image['width'] = $this->get_number();
    $image['height'] = $this->get_number();
    $image['flag'] = $flag = $this->next();
    $image['local_color_table_flag'] = ($flag & 0x80) > 0;    //局部色表
    $image['interlace_flag'] = ($flag & 0x40) > 0;        //交错
    $image['local_sort_flag'] = ($flag & 0x20) > 0;        //色表是否排序
    $image['size_of_local_color_table'] = $flag & 0x07;    //局部色表大小
    if($image['local_color_table_flag'])
        $image['local_color_table'] = $this->get_color_table($image['size_of_local_color_table']);
    $image['data'] = $this->get_table_based_image_data();
    $this->image[$this->frame] = array_merge($this->image[$this->frame], $image);
    $this->frame++;
  }

  /**
   * 内部方法 get_table_based_image_data
   * 读取图象数据
   **/
  function get_table_based_image_data() {
    $table_based_image_data_size = 0;
    $table_based_image_data = chr($this->next());
    while($n = $this->next()) {
        $table_based_image_data_size += $n;
        $table_based_image_data .= chr($n);
        $table_based_image_data .= $this->next($n);
    }
    $table_based_image_data .= chr(0);
    return $table_based_image_data;
  }

  /**
   * 内部方法 get_extension_introducer
   * 读取图象扩展
   **/
  function get_extension_introducer() {
    switch($this->next()) {
        case 0xf9:
            $size = $this->next(); //固定为4
            $flag = $this->next();
            $this->image[$this->frame]['disposal_method'] = ($flag >> 2) & 0x07;
            $this->image[$this->frame]['transparent_flag'] = $flag & 0x01;
            $this->image[$this->frame]['delay_time'] = $this->get_number();
            $this->image[$this->frame]['transparecy_index'] = $this->next();
            $this->next();
        break;
    case 0xfe:
        while($this->next() != 0);
        break;
    case 0x01:
        $this->next();
        $delay_time = $this->get_number();
        $delay_time = $this->get_number();
        $delay_time = $this->get_number();
        $delay_time = $this->get_number();
        $this->next();
        $this->next();
        $this->next();
        $this->next();
        while($this->next() != 0);
        break;
    case 0xff:
        $this->application_extension = $this->next($this->next());
        while($this->next() != 0);
        break;
    }
  }

  /**
   * 公共方法 info
   * 产生图片信息报告
   **/
  function info() {
    if(isset($_GET['frame'])) {
        echo $this->withdraw($_GET['frame']);
        exit;
    }
    $dict = array(
        'logical_screen_width' => '图片宽度',
        'logical_screen_height' => '图片高度',
        'global_color_table_flag' => '全局色表',
        'color_resolution' => '彩色分辨率',
        'sort_flag' => '排序标志',
        'size_of_global_color_table' => '全局色表大小',
        'background_color_index' => '背景色索引',
        'pixel_aspect_ratio' => '像素纵横比',
        'frame' => '帧数',
        'application_extension' => '应用程序扩展',
        );
    $image_dict = array(
        'left_position' => '图象左边距',
        'top_position' => '图象上边距',
        'width' => '图象宽',
        'height' => '图象高',
        'local_color_table_flag' => '局部色表',
        'interlace_flag' => '交错',
        'local_sort_flag' => '排序标志',
        'size_of_local_color_table' => '局部色表大小',
        'delay_time' => '停顿时间',
        'disposal_method' => '处置方式',
        'transparecy_index' => '透明色索引',
        );
    echo '';
    printf("", $this->imagename);
    echo '", $this->imagename);
    for($i=0; $i<$this->frame; $i++) {
        printf("",$i);
        echo '", $i);
    }
    echo "图片文件名 https://www.gxlcms.com/%s
';
    foreach($dict as $key => $value)
        printf("",$value,$this->$key);
    printf("https://www.gxlcms.com/%s https://www.gxlcms.com/%s 
帧号 https://www.gxlcms.com/%s
';
        foreach($image_dict as $key => $value)
            printf("",$value,$this->image[$i][$key]);
        printf("https://www.gxlcms.com/%s https://www.gxlcms.com/%s ";
  }

  /**
   * 内部方法 control_extension，由withdraw方法调用
   *

输出图象扩展控制段
   * 参数
   *  $frame 数值，图片帧号
   *  $delay_time 数值，图象停顿时间，单位为百分秒(10ms)
   *  $disposal_mothod 数值，处置方式
   * 返回 无
   **/
  function control_extension($frame=0, $delay_time=10, $disposal_mothod=0) {
    $transparent = $this->image[$frame]['transparecy_index'];
    $flag = ($disposal_mothod << 2) | $this->image[$frame]['transparent_flag'];
    echo pack("CCCCSCC", 0x21, 0xf9, 4, $flag, $delay_time, $transparent, 0);
  }

  /**
   * 内部方法 image_frame，由withdraw方法调用
   * 输出一帧图象
   * 参数
   *  $frame 数值，图片帧号
   *  $left 数值，图象左边距
   *  $top 数值，图象上边距
   *  $colortab 字符串，对比用的全局调色板数据
   * 返回 无
   **/
  function image_frame($frame=0, $left=null, $top=null, $colortab=null) {
      if($left == null) $left = $this->image[$frame]['left_position'];
      if($top == null) $top = $this->image[$frame]['top_position'];
    $flag = $this->image[$frame]['flag'];
    $color_table = '';
    if($this->image[$frame]['local_color_table_flag']) {
        //如图象有局部调色板则取局部调色板
        $color_table = $this->image[$frame]['local_color_table'];
    }elseif($colortable != null && $colortable != $this->global_color_table) {
        //如图象没有局部调色板且全局调色板与对比调色板不同，就把全局调色板设置为局部调色板
        $flag &= 0x40; //保留交错标志
        $flag |= $this->sort_flag ? 0x20 : 0x00; //设置排序标志
        $flag |= 0x80; //设置局部色表标志
        $flag |= $this->size_of_global_color_table;
        $color_table = $this->global_color_table;
    }
    $width = $this->image[$frame]['width'];
    $height = $this->image[$frame]['height'];
    echo pack("CSSSSC", 0x2c, $left, $top, $width, $height, $flag);
    echo $color_table;
    echo $this->image[$frame]['data'];
  }

  /**
   * 内部方法 image_header，由withdraw方法调用
   * 输出图片头
   * 参数
   *  $width 数值，图片宽
   *  $height 数值，图片高
   * 返回 无
   **/
  function image_header($width=0, $height=0) {
    ob_start();
      printf("GIF89ahttps://www.gxlcms.com/%shttps://www.gxlcms.com/%s%c%c%c"
          , pack("S", $this->logical_screen_width)
          , pack("S", $this->logical_screen_height)
          , $this->flag
          , $this->background_color_index
          , $this->pixel_aspect_ratio
          );
    if($this->global_color_table_flag)
        echo $this->global_color_table;
  }

  /**
   * 内部方法 image_end，由withdraw方法调用
   * 输出图片尾，并返回图片数据
   * 返回 字符串，图片数据
   **/
  function image_end() {
    echo chr(0x3b);
    $buf = ob_get_clean();
    return $buf;
  }

  /**
   * 公共方法 withdraw
   * 生成单帧的图片[文件]
   * 参数
   *  $frame 数值，提取的帧号
   *  $filename 字符串，目标文件名，缺省为空(不生成文件)
   * 返回 字符串，图片数据
   **/
  function withdraw($frame=0, $filename='') {
    if($frame > $this->frame-1) $frame = 0;
    $this->image_header();
    $this->control_extension($frame);
    $this->image_frame($frame);
    $buf = $this->image_end();
    if(!empty($filename))
         file_put_contents($filename, $buf);
    return $buf;
  }
}


$p = new TGif('old.gif');
//$p->info();
echo $p->withdraw(0, 'hello.gif');
//print_r($p->image);
?>

回复内容：

buffer, 0, $len);
    $this->buffer = substr($this->buffer, $len);
    if($len == 1)
        return ord($ch);
    return $ch;
  }

  /**
   * 内部方法 get_number
   * 从图片数据缓冲区读取一个整数
   * 参数 无
   * 返回 整数
   **/
  function get_number() {
    $t = unpack("Sn", $this->next(2));
    return $t['n'];
  }

  /**
   * 构造函数
   * 参数 $imagename 字符串，图片文件名或图片数据
   * 返回 无
   **/
  function TGif($imagename="images/xzn.gif") {
    $this->image = array();
    $this->frame = 0;
    if(is_file($imagename)) {
        $this->imagename = $imagename;
        $this->buffer = @file_get_contents($imagename)
            or trigger_error("$imagename 打不开", E_USER_ERROR);
    }else {
        substr($imagename, 0, 3) == 'GIF' or
            trigger_error("$imagename 不存在或不是GIF格式图片", E_USER_ERROR);
        $this->buffer = $imagename;
        $this->imagename = '未命名';
    }
    $this->get_header();
    while(strlen($this->buffer)) {
        switch($this->next()) {
            case 0x21: //图象扩展描述符
                $this->get_extension_introducer();
                break;
            case 0x2c: //图象描述符
                $this->get_image_descriptor();
                break;
            case 0x3b: //GIF数据流结束
                return;
        }
    }
  }

  /**
   * 内部方法 get_color_table
   * 读取调色板数据
   **/
  function get_color_table($num) {
    return $this->next(3*pow(2,$num+1));
  }

  /**
   * 内部方法 get_header
   * 读取头信息
   **/
  function get_header() {
    $this->signature = $this->next(3);    //类型标识gif
    if($this->signature != 'GIF')
        trigger_error("$this->imagename 不是GIF格式图片", E_USER_ERROR);
    $this->version = $this->next(3);    //版本标识
    $this->logical_screen_width = $this->get_number();    //逻辑屏幕宽
    $this->logical_screen_height = $this->get_number();    //逻辑屏幕高
    $this->flag = $flag = $this->next();
    $this->global_color_table_flag = ($flag & 0x80) > 0;    //是否有全局调色板
    $this->color_resolution = (($flag >> 4) & 0x07) + 1;    //彩色分辨率
    $this->sort_flag = ($flag & 0x08) > 0;            //调色板是否排序
    $this->size_of_global_color_table = $flag & 0x07;    //全局色板大小，2的乘方的指数
    $this->background_color_index = $this->next();        //背景色索引
    $this->pixel_aspect_ratio = $this->next();         //像素纵横比
    if($this->global_color_table_flag)
        $this->global_color_table = $this->get_color_table($this->size_of_global_color_table);
  }

  /**
   * 内部方法 get_image_descriptor
   * 读取图片信息
   **/
  function get_image_descriptor() {
    $image['left_position'] = $this->get_number();
    $image['top_position'] = $this->get_number();
    $image['width'] = $this->get_number();
    $image['height'] = $this->get_number();
    $image['flag'] = $flag = $this->next();
    $image['local_color_table_flag'] = ($flag & 0x80) > 0;    //局部色表
    $image['interlace_flag'] = ($flag & 0x40) > 0;        //交错
    $image['local_sort_flag'] = ($flag & 0x20) > 0;        //色表是否排序
    $image['size_of_local_color_table'] = $flag & 0x07;    //局部色表大小
    if($image['local_color_table_flag'])
        $image['local_color_table'] = $this->get_color_table($image['size_of_local_color_table']);
    $image['data'] = $this->get_table_based_image_data();
    $this->image[$this->frame] = array_merge($this->image[$this->frame], $image);
    $this->frame++;
  }

  /**
   * 内部方法 get_table_based_image_data
   * 读取图象数据
   **/
  function get_table_based_image_data() {
    $table_based_image_data_size = 0;
    $table_based_image_data = chr($this->next());
    while($n = $this->next()) {
        $table_based_image_data_size += $n;
        $table_based_image_data .= chr($n);
        $table_based_image_data .= $this->next($n);
    }
    $table_based_image_data .= chr(0);
    return $table_based_image_data;
  }

  /**
   * 内部方法 get_extension_introducer
   * 读取图象扩展
   **/
  function get_extension_introducer() {
    switch($this->next()) {
        case 0xf9:
            $size = $this->next(); //固定为4
            $flag = $this->next();
            $this->image[$this->frame]['disposal_method'] = ($flag >> 2) & 0x07;
            $this->image[$this->frame]['transparent_flag'] = $flag & 0x01;
            $this->image[$this->frame]['delay_time'] = $this->get_number();
            $this->image[$this->frame]['transparecy_index'] = $this->next();
            $this->next();
        break;
    case 0xfe:
        while($this->next() != 0);
        break;
    case 0x01:
        $this->next();
        $delay_time = $this->get_number();
        $delay_time = $this->get_number();
        $delay_time = $this->get_number();
        $delay_time = $this->get_number();
        $this->next();
        $this->next();
        $this->next();
        $this->next();
        while($this->next() != 0);
        break;
    case 0xff:
        $this->application_extension = $this->next($this->next());
        while($this->next() != 0);
        break;
    }
  }

  /**
   * 公共方法 info
   * 产生图片信息报告
   **/
  function info() {
    if(isset($_GET['frame'])) {
        echo $this->withdraw($_GET['frame']);
        exit;
    }
    $dict = array(
        'logical_screen_width' => '图片宽度',
        'logical_screen_height' => '图片高度',
        'global_color_table_flag' => '全局色表',
        'color_resolution' => '彩色分辨率',
        'sort_flag' => '排序标志',
        'size_of_global_color_table' => '全局色表大小',
        'background_color_index' => '背景色索引',
        'pixel_aspect_ratio' => '像素纵横比',
        'frame' => '帧数',
        'application_extension' => '应用程序扩展',
        );
    $image_dict = array(
        'left_position' => '图象左边距',
        'top_position' => '图象上边距',
        'width' => '图象宽',
        'height' => '图象高',
        'local_color_table_flag' => '局部色表',
        'interlace_flag' => '交错',
        'local_sort_flag' => '排序标志',
        'size_of_local_color_table' => '局部色表大小',
        'delay_time' => '停顿时间',
        'disposal_method' => '处置方式',
        'transparecy_index' => '透明色索引',
        );
    echo '';
    printf("", $this->imagename);
    echo '", $this->imagename);
    for($i=0; $i<$this->frame; $i++) {
        printf("",$i);
        echo '", $i);
    }
    echo "图片文件名 https://www.gxlcms.com/%s
';
    foreach($dict as $key => $value)
        printf("",$value,$this->$key);
    printf("https://www.gxlcms.com/%s https://www.gxlcms.com/%s 
帧号 https://www.gxlcms.com/%s
';
        foreach($image_dict as $key => $value)
            printf("",$value,$this->image[$i][$key]);
        printf("https://www.gxlcms.com/%s https://www.gxlcms.com/%s ";
  }

  /**
   * 内部方法 control_extension，由withdraw方法调用
   *

输出图象扩展控制段
   * 参数
   *  $frame 数值，图片帧号
   *  $delay_time 数值，图象停顿时间，单位为百分秒(10ms)
   *  $disposal_mothod 数值，处置方式
   * 返回 无
   **/
  function control_extension($frame=0, $delay_time=10, $disposal_mothod=0) {
    $transparent = $this->image[$frame]['transparecy_index'];
    $flag = ($disposal_mothod << 2) | $this->image[$frame]['transparent_flag'];
    echo pack("CCCCSCC", 0x21, 0xf9, 4, $flag, $delay_time, $transparent, 0);
  }

  /**
   * 内部方法 image_frame，由withdraw方法调用
   * 输出一帧图象
   * 参数
   *  $frame 数值，图片帧号
   *  $left 数值，图象左边距
   *  $top 数值，图象上边距
   *  $colortab 字符串，对比用的全局调色板数据
   * 返回 无
   **/
  function image_frame($frame=0, $left=null, $top=null, $colortab=null) {
      if($left == null) $left = $this->image[$frame]['left_position'];
      if($top == null) $top = $this->image[$frame]['top_position'];
    $flag = $this->image[$frame]['flag'];
    $color_table = '';
    if($this->image[$frame]['local_color_table_flag']) {
        //如图象有局部调色板则取局部调色板
        $color_table = $this->image[$frame]['local_color_table'];
    }elseif($colortable != null && $colortable != $this->global_color_table) {
        //如图象没有局部调色板且全局调色板与对比调色板不同，就把全局调色板设置为局部调色板
        $flag &= 0x40; //保留交错标志
        $flag |= $this->sort_flag ? 0x20 : 0x00; //设置排序标志
        $flag |= 0x80; //设置局部色表标志
        $flag |= $this->size_of_global_color_table;
        $color_table = $this->global_color_table;
    }
    $width = $this->image[$frame]['width'];
    $height = $this->image[$frame]['height'];
    echo pack("CSSSSC", 0x2c, $left, $top, $width, $height, $flag);
    echo $color_table;
    echo $this->image[$frame]['data'];
  }

  /**
   * 内部方法 image_header，由withdraw方法调用
   * 输出图片头
   * 参数
   *  $width 数值，图片宽
   *  $height 数值，图片高
   * 返回 无
   **/
  function image_header($width=0, $height=0) {
    ob_start();
      printf("GIF89ahttps://www.gxlcms.com/%shttps://www.gxlcms.com/%s%c%c%c"
          , pack("S", $this->logical_screen_width)
          , pack("S", $this->logical_screen_height)
          , $this->flag
          , $this->background_color_index
          , $this->pixel_aspect_ratio
          );
    if($this->global_color_table_flag)
        echo $this->global_color_table;
  }

  /**
   * 内部方法 image_end，由withdraw方法调用
   * 输出图片尾，并返回图片数据
   * 返回 字符串，图片数据
   **/
  function image_end() {
    echo chr(0x3b);
    $buf = ob_get_clean();
    return $buf;
  }

  /**
   * 公共方法 withdraw
   * 生成单帧的图片[文件]
   * 参数
   *  $frame 数值，提取的帧号
   *  $filename 字符串，目标文件名，缺省为空(不生成文件)
   * 返回 字符串，图片数据
   **/
  function withdraw($frame=0, $filename='') {
    if($frame > $this->frame-1) $frame = 0;
    $this->image_header();
    $this->control_extension($frame);
    $this->image_frame($frame);
    $buf = $this->image_end();
    if(!empty($filename))
         file_put_contents($filename, $buf);
    return $buf;
  }
}


$p = new TGif('old.gif');
//$p->info();
echo $p->withdraw(0, 'hello.gif');
//print_r($p->image);
?>

try imagemagick

使用 imagemagick就很简单了

用php将动态gif拆分成单帧

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