413 lines
12 KiB
PHP
413 lines
12 KiB
PHP
<?php
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define( 'MOV_TFHD_BASE_DATA_OFFSET', 0x01 );
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define( 'MOV_TFHD_STSD_ID', 0x02 );
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define( 'MOV_TFHD_DEFAULT_DURATION', 0x08 );
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define( 'MOV_TFHD_DEFAULT_SIZE', 0x10 );
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define( 'MOV_TFHD_DEFAULT_FLAGS', 0x20 );
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define( 'MOV_TFHD_DURATION_IS_EMPTY', 0x010000 );
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define( 'MOV_TFHD_DEFAULT_BASE_IS_MOOF', 0x020000 );
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define( 'MOV_TRUN_DATA_OFFSET', 0x01 );
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define( 'MOV_TRUN_FIRST_SAMPLE_FLAGS', 0x04 );
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define( 'MOV_TRUN_SAMPLE_DURATION', 0x100 );
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define( 'MOV_TRUN_SAMPLE_SIZE', 0x200 );
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define( 'MOV_TRUN_SAMPLE_FLAGS', 0x400 );
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define( 'MOV_TRUN_SAMPLE_CTS', 0x800 );
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class MP4Reader {
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/**
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* @var resource $file
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*/
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protected $file;
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public function __construct( $file ) {
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$this->file = $file;
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}
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/**
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* @return int
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*/
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public function pos() {
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$pos = ftell( $this->file );
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if ( $pos === false ) {
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throw new Exception( 'Failed to read position in MP4 file' );
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}
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return $pos;
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}
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/**
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* @param int $length number of bytes to read
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* @return string|false raw bytes or false on eof
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*/
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public function readBytes( $length ) {
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$bytes = fread( $this->file, $length );
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if ( feof( $this->file ) ) {
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return false;
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}
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if ( $bytes === false || strlen( $bytes ) < $length ) {
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throw new Exception( "Failed to read $length bytes from MP4 file" );
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}
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return $bytes;
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}
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/**
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* @param int $length number of bytes to skip over
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*/
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private function skipBytes( $length ) {
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$retval = fseek( $this->file, $length, SEEK_CUR );
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if ( $retval < 0 ) {
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throw new Exception( "Failed to skip ahead $length bytes in MP4 file" );
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}
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}
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/**
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* @return int|false 64-bit integer value or false on eof
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*/
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public function read64() {
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$bytes = $this->readBytes( 8 );
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if ( $bytes === false ) {
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return false;
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}
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$data = unpack( 'Jval', $bytes );
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return $data['val'];
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}
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/**
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* @return int|false 32-bit integer value or false on eof
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*/
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public function read32() {
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$bytes = $this->readBytes( 4 );
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if ( $bytes === false ) {
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return false;
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}
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$data = unpack( 'Nval', $bytes );
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return $data['val'];
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}
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/**
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* @return int|false 24-bit integer value or false on eof
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*/
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public function read24() {
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$bytes = $this->readBytes( 3 );
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if ( $bytes === false ) {
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return false;
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}
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$data = unpack( 'Nval', "\x00$bytes" );
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return $data['val'];
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}
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/**
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* @return int|false 16-bit integer value or false on eof
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*/
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public function read16() {
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$bytes = $this->readBytes( 2 );
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if ( $bytes === false ) {
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return false;
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}
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$data = unpack( 'nval', $bytes );
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return $data['val'];
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}
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/**
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* @return int|false 8-bit integer value or false on eof
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*/
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public function read8() {
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$bytes = $this->readBytes( 1 );
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if ( $bytes === false ) {
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return false;
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}
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return ord( $bytes );
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}
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/**
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* @return string|false 4-byte type code or false on eof
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*/
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public function readType() {
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return $this->readBytes( 4 );
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}
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/**
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* @param callable $callback in the form function(MP4Box)
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* @return bool true on success, or false on eof
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*/
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public function readBox( $callback ) {
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$start = $this->pos();
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$size = $this->read32();
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if ( $size === false ) {
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return false;
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}
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$end = $start + $size;
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$type = $this->readType();
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if ( $type === false ) {
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return false;
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}
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$box = new MP4Box( $this->file, $start, $size, $type );
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$retval = call_user_func( $callback, $box );
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$remaining = $end - $this->pos();
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if ( $remaining > 0 ) {
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$this->skipBytes( $remaining );
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}
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return true;
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}
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/**
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* Scan a series of boxes and pass control based on type.
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* Unrecognized boxes will be skipped over.
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* @param callable[] $map array of callables keyed by fourCC type code
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*/
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public function boxes( $map ) {
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$ok = true;
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while ( $ok ) {
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$ok = $this->readBox( function ( $box ) use ( $map ) {
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$handler = $map[$box->type] ?? false;
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if ( is_callable( $handler ) ) {
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call_user_func( $handler, $box );
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} else if ( is_array( $handler ) ) {
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$box->boxes( $handler );
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} else if ( $handler === false ) {
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// no-op
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} else {
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throw new Exception( "Unexpected callback or map type for type $box->type" );
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}
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} );
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}
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}
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}
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class MP4FileReader extends MP4Reader {
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/**
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* @param string $filename
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*/
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public function __construct( $filename ) {
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$file = fopen( $filename, 'rb' );
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if ( !$file ) {
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throw new Exception( 'Failed to open MP4 input file' );
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}
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parent::__construct( $file );
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}
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function __destruct() {
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if ( $this->file ) {
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fclose( $this->file );
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$this->file = null;
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}
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}
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}
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class MP4Box extends MP4Reader {
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public $start;
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public $size;
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public $type;
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public function __construct( $file, $start, $size, $type ) {
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parent::__construct( $file );
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$this->start = $start;
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$this->size = $size;
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$this->type = $type;
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}
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public function end() {
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return $this->start + $this->size;
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}
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public function remaining() {
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return $this->end() - $this->pos();
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}
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public function readBytes( $length ) {
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if ( $length > $this->remaining() ) {
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return false;
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}
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return parent::readBytes( $length );
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}
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}
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function hexdump( $str ) {
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$out = '';
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$len = strlen( $str );
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for ( $i = 0; $i < $len; $i++ ) {
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$char = $str[$i];
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$byte = ord( $char );
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// really?
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$digits = str_pad( dechex( $byte ), 2, '0', STR_PAD_LEFT );
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$out .= $digits;
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}
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return $out;
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}
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function safestr( $str ) {
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$out = '';
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$len = strlen( $str );
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for ( $i = 0; $i < $len; $i++ ) {
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$char = $str[$i];
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$byte = ord( $char );
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if ( $byte >= 32 && $byte <= 126 ) {
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$out .= $char;
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} else {
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$out .= '.';
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}
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}
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return $out;
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}
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/**
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* @param string $filename - input MP4 file to read
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* @return array[] - list of segment info
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*/
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function extractFragmentedMP4( $filename ) {
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$segments = [];
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$mp4 = new MP4FileReader( $filename );
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$eof = false;
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$moof = false;
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$timestamp = 0.0;
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$duration = 0.0;
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$timescale = 0;
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$dts = 0;
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$first_pts = 0;
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$max_pts = 0;
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$init = false;
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/*
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Need to:
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- find the end of the moov; everything up to that is the initialization segment
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- https://www.w3.org/TR/mse-byte-stream-format-isobmff/#iso-init-segments
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- find the start of each styp+moof fragment
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- https://www.w3.org/TR/mse-byte-stream-format-isobmff/#iso-media-segments
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- find the start timestamp of each moof fragment
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- find the duration of each moof fragment
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moov.trak.mdia.mdhd.timescale - looks useful 12288 for 24fps?
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moov.trak.mdia.mdhd.duration - 0 on the moov
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moov.mvex.trex.default_sample_duration - 0 on the moov
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moof.traf.tfhd.default_sample_duration is 512 on these
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moof.traf.tfdt.baseMediaDecodeTime is 0 on the first, 122880 on the second frag (10 seconds in?)
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moof.mdat.sample_duration is empty here (uses default I guess?)
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moof.mdat.sample_composition_time_offset also empty
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opus has timescale 48000 in moov.trak.mdia.mdhd
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*/
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$mp4->boxes( [
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'moov' => [
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'trak' => [
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'mdia' => [
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'mdhd' => function ( $box ) use ( &$timescale ) {
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$version = $box->read8();
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$flags = $box->read24();
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if ( $version == 1 ) {
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$box->read64();
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$box->read64();
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} else {
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$box->read32();
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$box->read32();
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}
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$timescale = $box->read32();
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}
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],
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],
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],
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'moof' => function ( $box ) use ( &$segments, &$moof, &$init, &$timestamp, &$duration, &$dts, &$first_pts, &$max_pts, &$timescale ) {
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if ( !$init ) {
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$init = [
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'start' => 0,
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'size' => $box->start,
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'timestamp' => 0.0,
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'duration' => 0.0,
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];
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$segments['init'] = $init;
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}
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$moof = $box->start;
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$default_sample_duration = 0;
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$first_pts = 0;
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$max_pts = 0;
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$box->boxes( [
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'traf' => [
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'tfhd' => function( $box ) use ( &$default_sample_duration ) {
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$version = $box->read8();
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$flags = $box->read24();
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$track_id = $box->read32();
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if ( $flags & MOV_TFHD_BASE_DATA_OFFSET ) {
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$box->read64();
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}
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if ( $flags & MOV_TFHD_STSD_ID ) {
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$box->read32();
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}
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if ( $flags & MOV_TFHD_DEFAULT_DURATION ) {
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$default_sample_duration = $box->read32();
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}
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},
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'trun' => function( $box ) use ( &$default_sample_duration, &$dts, &$first_pts, &$max_pts ) {
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$version = $box->read8();
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$flags = $box->read24();
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$entries = $box->read32();
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if ( $flags & MOV_TRUN_DATA_OFFSET ) {
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$box->read32();
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}
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if ( $flags & MOV_TRUN_FIRST_SAMPLE_FLAGS ) {
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$box->read32();
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}
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for ( $i = 0; $i < $entries; $i++ ) {
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$pts = $dts;
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$sample_duration = $default_sample_duration;
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if ( $flags & MOV_TRUN_SAMPLE_DURATION ) {
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$sample_duration = $box->read32();
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}
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if ( $flags & MOV_TRUN_SAMPLE_SIZE ) {
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$box->read32();
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}
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if ( $flags & MOV_TRUN_SAMPLE_FLAGS ) {
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$box->read32();
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}
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if ( $flags & MOV_TRUN_SAMPLE_CTS ) {
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$pts += $box->read32();
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}
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if ( $i == 0 ) {
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$first_pts = $pts;
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}
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$max_pts = max( $max_pts, $pts + $sample_duration );
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$dts += $sample_duration;
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}
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echo "$first_pts - $max_pts\n";
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}
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],
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] );
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},
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'mdat' => function ( $box ) use ( &$segments, &$moof, &$first_pts, &$max_pts, &$timescale ) {
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var_dump( $first_pts );
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var_dump( $max_pts );
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var_dump( $timescale );
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array_push( $segments, [
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'start' => $moof,
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'size' => $box->end() - $moof,
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'timestamp' => $first_pts / $timescale,
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'duration' => ( $max_pts - $first_pts ) / $timescale,
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] );
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}
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] );
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return $segments;
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}
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$argv = $_SERVER['argv'];
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$self = array_shift( $argv );
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$filename = array_shift( $argv );
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$segments = extractFragmentedMP4( $filename );
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//var_dump( $segments );
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foreach ( $segments as $key => $segment ) {
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if ( $key === 'init' ) {
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print "$key {$segment['start']},{$segment['size']}\n";
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} else {
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print "$key {$segment['timestamp']},{$segment['duration']} @ {$segment['start']},{$segment['size']}\n";
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}
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}
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