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<?php

if (!defined('GETID3_INCLUDEPATH')) {
    exit;
}
define('GETID3_FLV_TAG_AUDIO', 8);
define('GETID3_FLV_TAG_VIDEO', 9);
define('GETID3_FLV_TAG_META', 18);
define('GETID3_FLV_VIDEO_H263', 2);
define('GETID3_FLV_VIDEO_SCREEN', 3);
define('GETID3_FLV_VIDEO_VP6FLV', 4);
define('GETID3_FLV_VIDEO_VP6FLV_ALPHA', 5);
define('GETID3_FLV_VIDEO_SCREENV2', 6);
define('GETID3_FLV_VIDEO_H264', 7);
define('H264_AVC_SEQUENCE_HEADER', 0);
define('H264_PROFILE_BASELINE', 66);
define('H264_PROFILE_MAIN', 77);
define('H264_PROFILE_EXTENDED', 88);
define('H264_PROFILE_HIGH', 100);
define('H264_PROFILE_HIGH10', 110);
define('H264_PROFILE_HIGH422', 122);
define('H264_PROFILE_HIGH444', 144);
define('H264_PROFILE_HIGH444_PREDICTIVE', 244);
class getid3_flv extends getid3_handler
{
    const magic = 'FLV';
    public $max_frames = 100000;
    public function Analyze()
    {
        $info =& $this->getid3->info;
        $this->fseek($info['avdataoffset']);
        $FLVdataLength = $info['avdataend'] - $info['avdataoffset'];
        $FLVheader = $this->fread(5);
        $info['fileformat'] = 'flv';
        $info['flv']['header']['signature'] = substr($FLVheader, 0, 3);
        $info['flv']['header']['version'] = getid3_lib::BigEndian2Int(substr($FLVheader, 3, 1));
        $TypeFlags = getid3_lib::BigEndian2Int(substr($FLVheader, 4, 1));
        if ($info['flv']['header']['signature'] != self::magic) {
            $this->error('Expecting "' . getid3_lib::PrintHexBytes(self::magic) . '" at offset ' . $info['avdataoffset'] . ', found "' . getid3_lib::PrintHexBytes($info['flv']['header']['signature']) . '"');
            unset($info['flv'], $info['fileformat']);
            return false;
        }
        $info['flv']['header']['hasAudio'] = (bool) ($TypeFlags & 0x4);
        $info['flv']['header']['hasVideo'] = (bool) ($TypeFlags & 0x1);
        $FrameSizeDataLength = getid3_lib::BigEndian2Int($this->fread(4));
        $FLVheaderFrameLength = 9;
        if ($FrameSizeDataLength > $FLVheaderFrameLength) {
            $this->fseek($FrameSizeDataLength - $FLVheaderFrameLength, SEEK_CUR);
        }
        $Duration = 0;
        $found_video = false;
        $found_audio = false;
        $found_meta = false;
        $found_valid_meta_playtime = false;
        $tagParseCount = 0;
        $info['flv']['framecount'] = array('total' => 0, 'audio' => 0, 'video' => 0);
        $flv_framecount =& $info['flv']['framecount'];
        while ($this->ftell() + 16 < $info['avdataend'] && ($tagParseCount++ <= $this->max_frames || !$found_valid_meta_playtime)) {
            $ThisTagHeader = $this->fread(16);
            $PreviousTagLength = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 0, 4));
            $TagType = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 4, 1));
            $DataLength = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 5, 3));
            $Timestamp = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 8, 3));
            $LastHeaderByte = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 15, 1));
            $NextOffset = $this->ftell() - 1 + $DataLength;
            if ($Timestamp > $Duration) {
                $Duration = $Timestamp;
            }
            $flv_framecount['total']++;
            switch ($TagType) {
                case GETID3_FLV_TAG_AUDIO:
                    $flv_framecount['audio']++;
                    if (!$found_audio) {
                        $found_audio = true;
                        $info['flv']['audio']['audioFormat'] = $LastHeaderByte >> 4 & 0xf;
                        $info['flv']['audio']['audioRate'] = $LastHeaderByte >> 2 & 0x3;
                        $info['flv']['audio']['audioSampleSize'] = $LastHeaderByte >> 1 & 0x1;
                        $info['flv']['audio']['audioType'] = $LastHeaderByte & 0x1;
                    }
                    break;
                case GETID3_FLV_TAG_VIDEO:
                    $flv_framecount['video']++;
                    if (!$found_video) {
                        $found_video = true;
                        $info['flv']['video']['videoCodec'] = $LastHeaderByte & 0x7;
                        $FLVvideoHeader = $this->fread(11);
                        if ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_H264) {
                            $AVCPacketType = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 0, 1));
                            if ($AVCPacketType == H264_AVC_SEQUENCE_HEADER) {
                                $configurationVersion = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 1));
                                $AVCProfileIndication = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 1));
                                $profile_compatibility = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 1));
                                $lengthSizeMinusOne = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 7, 1));
                                $numOfSequenceParameterSets = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 8, 1));
                                if (($numOfSequenceParameterSets & 0x1f) != 0) {
                                    $spsSize = getid3_lib::LittleEndian2Int(substr($FLVvideoHeader, 9, 2));
                                    $sps = $this->fread($spsSize);
                                    if (strlen($sps) == $spsSize) {
                                        $spsReader = new AVCSequenceParameterSetReader($sps);
                                        $spsReader->readData();
                                        $info['video']['resolution_x'] = $spsReader->getWidth();
                                        $info['video']['resolution_y'] = $spsReader->getHeight();
                                    }
                                }
                            }
                        } elseif ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_H263) {
                            $PictureSizeType = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 3, 2)) >> 7;
                            $PictureSizeType = $PictureSizeType & 0x7;
                            $info['flv']['header']['videoSizeType'] = $PictureSizeType;
                            switch ($PictureSizeType) {
                                case 0:
                                    $PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 2)) >> 7;
                                    $PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 2)) >> 7;
                                    $info['video']['resolution_x'] = $PictureSizeEnc['x'] & 0xff;
                                    $info['video']['resolution_y'] = $PictureSizeEnc['y'] & 0xff;
                                    break;
                                case 1:
                                    $PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 3)) >> 7;
                                    $PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 3)) >> 7;
                                    $info['video']['resolution_x'] = $PictureSizeEnc['x'] & 0xffff;
                                    $info['video']['resolution_y'] = $PictureSizeEnc['y'] & 0xffff;
                                    break;
                                case 2:
                                    $info['video']['resolution_x'] = 352;
                                    $info['video']['resolution_y'] = 288;
                                    break;
                                case 3:
                                    $info['video']['resolution_x'] = 176;
                                    $info['video']['resolution_y'] = 144;
                                    break;
                                case 4:
                                    $info['video']['resolution_x'] = 128;
                                    $info['video']['resolution_y'] = 96;
                                    break;
                                case 5:
                                    $info['video']['resolution_x'] = 320;
                                    $info['video']['resolution_y'] = 240;
                                    break;
                                case 6:
                                    $info['video']['resolution_x'] = 160;
                                    $info['video']['resolution_y'] = 120;
                                    break;
                                default:
                                    $info['video']['resolution_x'] = 0;
                                    $info['video']['resolution_y'] = 0;
                                    break;
                            }
                        } elseif ($info['flv']['video']['videoCodec'] == GETID3_FLV_VIDEO_VP6FLV_ALPHA) {
                            if (!isset($info['video']['resolution_x'])) {
                                $PictureSizeEnc['x'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 2));
                                $PictureSizeEnc['y'] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 7, 2));
                                $info['video']['resolution_x'] = ($PictureSizeEnc['x'] & 0xff) << 3;
                                $info['video']['resolution_y'] = ($PictureSizeEnc['y'] & 0xff) << 3;
                            }
                        }
                        if (!empty($info['video']['resolution_x']) && !empty($info['video']['resolution_y'])) {
                            $info['video']['pixel_aspect_ratio'] = $info['video']['resolution_x'] / $info['video']['resolution_y'];
                        }
                    }
                    break;
                case GETID3_FLV_TAG_META:
                    if (!$found_meta) {
                        $found_meta = true;
                        $this->fseek(-1, SEEK_CUR);
                        $datachunk = $this->fread($DataLength);
                        $AMFstream = new AMFStream($datachunk);
                        $reader = new AMFReader($AMFstream);
                        $eventName = $reader->readData();
                        $info['flv']['meta'][$eventName] = $reader->readData();
                        unset($reader);
                        $copykeys = array('framerate' => 'frame_rate', 'width' => 'resolution_x', 'height' => 'resolution_y', 'audiodatarate' => 'bitrate', 'videodatarate' => 'bitrate');
                        foreach ($copykeys as $sourcekey => $destkey) {
                            if (isset($info['flv']['meta']['onMetaData'][$sourcekey])) {
                                switch ($sourcekey) {
                                    case 'width':
                                    case 'height':
                                        $info['video'][$destkey] = intval(round($info['flv']['meta']['onMetaData'][$sourcekey]));
                                        break;
                                    case 'audiodatarate':
                                        $info['audio'][$destkey] = getid3_lib::CastAsInt(round($info['flv']['meta']['onMetaData'][$sourcekey] * 1000));
                                        break;
                                    case 'videodatarate':
                                    case 'frame_rate':
                                    default:
                                        $info['video'][$destkey] = $info['flv']['meta']['onMetaData'][$sourcekey];
                                        break;
                                }
                            }
                        }
                        if (!empty($info['flv']['meta']['onMetaData']['duration'])) {
                            $found_valid_meta_playtime = true;
                        }
                    }
                    break;
                default:
                    break;
            }
            $this->fseek($NextOffset);
        }
        $info['playtime_seconds'] = $Duration / 1000;
        if ($info['playtime_seconds'] > 0) {
            $info['bitrate'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['playtime_seconds'];
        }
        if ($info['flv']['header']['hasAudio']) {
            $info['audio']['codec'] = self::audioFormatLookup($info['flv']['audio']['audioFormat']);
            $info['audio']['sample_rate'] = self::audioRateLookup($info['flv']['audio']['audioRate']);
            $info['audio']['bits_per_sample'] = self::audioBitDepthLookup($info['flv']['audio']['audioSampleSize']);
            $info['audio']['channels'] = $info['flv']['audio']['audioType'] + 1;
            $info['audio']['lossless'] = $info['flv']['audio']['audioFormat'] ? false : true;
            $info['audio']['dataformat'] = 'flv';
        }
        if (!empty($info['flv']['header']['hasVideo'])) {
            $info['video']['codec'] = self::videoCodecLookup($info['flv']['video']['videoCodec']);
            $info['video']['dataformat'] = 'flv';
            $info['video']['lossless'] = false;
        }
        if (!empty($info['flv']['meta']['onMetaData']['duration'])) {
            $info['playtime_seconds'] = $info['flv']['meta']['onMetaData']['duration'];
            $info['bitrate'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['playtime_seconds'];
        }
        if (isset($info['flv']['meta']['onMetaData']['audiocodecid'])) {
            $info['audio']['codec'] = self::audioFormatLookup($info['flv']['meta']['onMetaData']['audiocodecid']);
        }
        if (isset($info['flv']['meta']['onMetaData']['videocodecid'])) {
            $info['video']['codec'] = self::videoCodecLookup($info['flv']['meta']['onMetaData']['videocodecid']);
        }
        return true;
    }
    public static function audioFormatLookup($id)
    {
        static $lookup = array(0 => 'Linear PCM, platform endian', 1 => 'ADPCM', 2 => 'mp3', 3 => 'Linear PCM, little endian', 4 => 'Nellymoser 16kHz mono', 5 => 'Nellymoser 8kHz mono', 6 => 'Nellymoser', 7 => 'G.711A-law logarithmic PCM', 8 => 'G.711 mu-law logarithmic PCM', 9 => 'reserved', 10 => 'AAC', 11 => 'Speex', 12 => false, 13 => false, 14 => 'mp3 8kHz', 15 => 'Device-specific sound');
        return isset($lookup[$id]) ? $lookup[$id] : false;
    }
    public static function audioRateLookup($id)
    {
        static $lookup = array(0 => 5500, 1 => 11025, 2 => 22050, 3 => 44100);
        return isset($lookup[$id]) ? $lookup[$id] : false;
    }
    public static function audioBitDepthLookup($id)
    {
        static $lookup = array(0 => 8, 1 => 16);
        return isset($lookup[$id]) ? $lookup[$id] : false;
    }
    public static function videoCodecLookup($id)
    {
        static $lookup = array(GETID3_FLV_VIDEO_H263 => 'Sorenson H.263', GETID3_FLV_VIDEO_SCREEN => 'Screen video', GETID3_FLV_VIDEO_VP6FLV => 'On2 VP6', GETID3_FLV_VIDEO_VP6FLV_ALPHA => 'On2 VP6 with alpha channel', GETID3_FLV_VIDEO_SCREENV2 => 'Screen video v2', GETID3_FLV_VIDEO_H264 => 'Sorenson H.264');
        return isset($lookup[$id]) ? $lookup[$id] : false;
    }
}
class AMFStream
{
    public $bytes;
    public $pos;
    public function __construct(&$bytes)
    {
        $this->bytes =& $bytes;
        $this->pos = 0;
    }
    public function readByte()
    {
        return ord(substr($this->bytes, $this->pos++, 1));
    }
    public function readInt()
    {
        return ($this->readByte() << 8) + $this->readByte();
    }
    public function readLong()
    {
        return ($this->readByte() << 24) + ($this->readByte() << 16) + ($this->readByte() << 8) + $this->readByte();
    }
    public function readDouble()
    {
        return getid3_lib::BigEndian2Float($this->read(8));
    }
    public function readUTF()
    {
        $length = $this->readInt();
        return $this->read($length);
    }
    public function readLongUTF()
    {
        $length = $this->readLong();
        return $this->read($length);
    }
    public function read($length)
    {
        $val = substr($this->bytes, $this->pos, $length);
        $this->pos += $length;
        return $val;
    }
    public function peekByte()
    {
        $pos = $this->pos;
        $val = $this->readByte();
        $this->pos = $pos;
        return $val;
    }
    public function peekInt()
    {
        $pos = $this->pos;
        $val = $this->readInt();
        $this->pos = $pos;
        return $val;
    }
    public function peekLong()
    {
        $pos = $this->pos;
        $val = $this->readLong();
        $this->pos = $pos;
        return $val;
    }
    public function peekDouble()
    {
        $pos = $this->pos;
        $val = $this->readDouble();
        $this->pos = $pos;
        return $val;
    }
    public function peekUTF()
    {
        $pos = $this->pos;
        $val = $this->readUTF();
        $this->pos = $pos;
        return $val;
    }
    public function peekLongUTF()
    {
        $pos = $this->pos;
        $val = $this->readLongUTF();
        $this->pos = $pos;
        return $val;
    }
}
class AMFReader
{
    public $stream;
    public function __construct(AMFStream $stream)
    {
        $this->stream = $stream;
    }
    public function readData()
    {
        $value = null;
        $type = $this->stream->readByte();
        switch ($type) {
            case 0:
                $value = $this->readDouble();
                break;
            case 1:
                $value = $this->readBoolean();
                break;
            case 2:
                $value = $this->readString();
                break;
            case 3:
                $value = $this->readObject();
                break;
            case 6:
                return null;
            case 8:
                $value = $this->readMixedArray();
                break;
            case 10:
                $value = $this->readArray();
                break;
            case 11:
                $value = $this->readDate();
                break;
            case 13:
                $value = $this->readLongString();
                break;
            case 15:
                $value = $this->readXML();
                break;
            case 16:
                $value = $this->readTypedObject();
                break;
            default:
                $value = '(unknown or unsupported data type)';
                break;
        }
        return $value;
    }
    public function readDouble()
    {
        return $this->stream->readDouble();
    }
    public function readBoolean()
    {
        return $this->stream->readByte() == 1;
    }
    public function readString()
    {
        return $this->stream->readUTF();
    }
    public function readObject()
    {
        $data = array();
        $key = null;
        while ($key = $this->stream->readUTF()) {
            $data[$key] = $this->readData();
        }
        if ($key == '' && $this->stream->peekByte() == 0x9) {
            $this->stream->readByte();
        }
        return $data;
    }
    public function readMixedArray()
    {
        $highestIndex = $this->stream->readLong();
        $data = array();
        $key = null;
        while ($key = $this->stream->readUTF()) {
            if (is_numeric($key)) {
                $key = (int) $key;
            }
            $data[$key] = $this->readData();
        }
        if ($key == '' && $this->stream->peekByte() == 0x9) {
            $this->stream->readByte();
        }
        return $data;
    }
    public function readArray()
    {
        $length = $this->stream->readLong();
        $data = array();
        for ($i = 0; $i < $length; $i++) {
            $data[] = $this->readData();
        }
        return $data;
    }
    public function readDate()
    {
        $timestamp = $this->stream->readDouble();
        $timezone = $this->stream->readInt();
        return $timestamp;
    }
    public function readLongString()
    {
        return $this->stream->readLongUTF();
    }
    public function readXML()
    {
        return $this->stream->readLongUTF();
    }
    public function readTypedObject()
    {
        $className = $this->stream->readUTF();
        return $this->readObject();
    }
}
class AVCSequenceParameterSetReader
{
    public $sps;
    public $start = 0;
    public $currentBytes = 0;
    public $currentBits = 0;
    public $width;
    public $height;
    public function __construct($sps)
    {
        $this->sps = $sps;
    }
    public function readData()
    {
        $this->skipBits(8);
        $this->skipBits(8);
        $profile = $this->getBits(8);
        if ($profile > 0) {
            $this->skipBits(8);
            $level_idc = $this->getBits(8);
            $this->expGolombUe();
            $this->expGolombUe();
            $picOrderType = $this->expGolombUe();
            if ($picOrderType == 0) {
                $this->expGolombUe();
            } elseif ($picOrderType == 1) {
                $this->skipBits(1);
                $this->expGolombSe();
                $this->expGolombSe();
                $num_ref_frames_in_pic_order_cnt_cycle = $this->expGolombUe();
                for ($i = 0; $i < $num_ref_frames_in_pic_order_cnt_cycle; $i++) {
                    $this->expGolombSe();
                }
            }
            $this->expGolombUe();
            $this->skipBits(1);
            $pic_width_in_mbs_minus1 = $this->expGolombUe();
            $pic_height_in_map_units_minus1 = $this->expGolombUe();
            $frame_mbs_only_flag = $this->getBits(1);
            if ($frame_mbs_only_flag == 0) {
                $this->skipBits(1);
            }
            $this->skipBits(1);
            $frame_cropping_flag = $this->getBits(1);
            $frame_crop_left_offset = 0;
            $frame_crop_right_offset = 0;
            $frame_crop_top_offset = 0;
            $frame_crop_bottom_offset = 0;
            if ($frame_cropping_flag) {
                $frame_crop_left_offset = $this->expGolombUe();
                $frame_crop_right_offset = $this->expGolombUe();
                $frame_crop_top_offset = $this->expGolombUe();
                $frame_crop_bottom_offset = $this->expGolombUe();
            }
            $this->skipBits(1);
            $this->width = ($pic_width_in_mbs_minus1 + 1) * 16 - $frame_crop_left_offset * 2 - $frame_crop_right_offset * 2;
            $this->height = (2 - $frame_mbs_only_flag) * ($pic_height_in_map_units_minus1 + 1) * 16 - $frame_crop_top_offset * 2 - $frame_crop_bottom_offset * 2;
        }
    }
    public function skipBits($bits)
    {
        $newBits = $this->currentBits + $bits;
        $this->currentBytes += (int) floor($newBits / 8);
        $this->currentBits = $newBits % 8;
    }
    public function getBit()
    {
        $result = getid3_lib::BigEndian2Int(substr($this->sps, $this->currentBytes, 1)) >> 7 - $this->currentBits & 0x1;
        $this->skipBits(1);
        return $result;
    }
    public function getBits($bits)
    {
        $result = 0;
        for ($i = 0; $i < $bits; $i++) {
            $result = ($result << 1) + $this->getBit();
        }
        return $result;
    }
    public function expGolombUe()
    {
        $significantBits = 0;
        $bit = $this->getBit();
        while ($bit == 0) {
            $significantBits++;
            $bit = $this->getBit();
            if ($significantBits > 31) {
                return 0;
            }
        }
        return (1 << $significantBits) + $this->getBits($significantBits) - 1;
    }
    public function expGolombSe()
    {
        $result = $this->expGolombUe();
        if (($result & 0x1) == 0) {
            return -($result >> 1);
        } else {
            return $result + 1 >> 1;
        }
    }
    public function getWidth()
    {
        return $this->width;
    }
    public function getHeight()
    {
        return $this->height;
    }
}