171 lines
4.1 KiB
PHP
171 lines
4.1 KiB
PHP
<?php
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/*
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PRIV frame type
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should contain:
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The ID3 PRIV owner identifier MUST be
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"com.apple.streaming.transportStreamTimestamp". The ID3 payload MUST
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be a 33-bit MPEG-2 Program Elementary Stream timestamp expressed as a
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big-endian eight-octet number, with the upper 31 bits set to zero.
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Clients SHOULD NOT play Packed Audio Segments without this ID3 tag.
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https://id3.org/id3v2.4.0-frames
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https://id3.org/id3v2.4.0-structure
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bit order is MSB first, big-endian
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header 10 bytes
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extended header (var, optional)
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frames (variable)
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pading (variable, optional)
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footer (10 bytes, optional)
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header:
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"ID3"
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version: 16 bits $04 00
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flags: 32 bits
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idv2 size: 32 bits (in chunks of 4 bytes, not counting header or footer)
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flags:
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bit 7 - unsyncrhonization (??)
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bit 6 - extended header
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bit 5 - experimental indicator
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bit 4 - footer present
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frame:
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id - 32 bits (four chars)
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size - 32 bits (in chunks of 4 bytes, excluding frame header)
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flags - 16 bits
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(frame data)
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priv payload:
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owner text string followed by \x00
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(binary data)
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The timestamps... I think... have 90 kHz integer resolution
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so convert from the decimal seconds in the HLS
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*/
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function hexdump($str) {
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$len = strlen( $str );
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return unpack("H*", $str)[1];
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}
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const KHZ_90 = 90000;
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const MHZ_27 = 27000000;
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function process_mp3( $filename, $data, $pts ) {
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$owner = "com.apple.streaming.transportStreamTimestamp\x00";
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$timestamp = $pts * KHZ_90;
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$timestamp_high = 0;
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$timestamp_low = intval( $timestamp ); // assume they won't get too big for 31 bits
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$frame_data = pack(
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'a*NN',
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$owner,
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$timestamp_high,
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$timestamp_low,
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);
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$frame_type = 'PRIV';
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$frame_flags = 0;
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$frame_length = strlen( $frame_data ); // if >127 bytes may need to adjust
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$frame = pack(
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'a4Nna*',
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$frame_type,
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$frame_length,
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$frame_flags,
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$frame_data
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);
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$tag_type = 'ID3';
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$tag_version = 0x0400;
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$tag_flags = 0;
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$tag_length = strlen( $frame ); // if >127 bytes may need to adjust
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$tag = pack(
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'a3nCNa*',
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$tag_type,
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$tag_version,
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$tag_flags,
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$tag_length,
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$frame
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);
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$hex = hexdump($tag);
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print "$filename $pts $hex\n";
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return "$tag$data";
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}
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$args = $_SERVER['argv'];
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$self = array_shift( $args );
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//$playlist = "caminandes-llamigos.webm.audio.mp3.m3u8";
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//$playlist_out = "caminandes-llamigos.webm.audio.mp3.combined.m3u8";
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//$outfile = "caminandes-llamigos.webm.audio.mp3";
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$playlist = array_shift( $args );
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$playlist_out = $playlist;
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$outfile = array_shift( $args );
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$process_mp3 = preg_match('/\.mp3$/i', $outfile);
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$lines = file( $playlist, FILE_IGNORE_NEW_LINES + FILE_SKIP_EMPTY_LINES );
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$pts = 0.0;
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$duration = 0.0;
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$lines_out = [];
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$chunks = [];
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$offset = 0;
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foreach ( $lines as $line ) {
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// create a single-file version
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// and rewrite the manifest
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/*
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#EXTM3U
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#EXT-X-VERSION:3
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#EXT-X-MEDIA-SEQUENCE:0
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#EXT-X-ALLOW-CACHE:YES
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#EXT-X-TARGETDURATION:11
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#EXTINF:10.005397,
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caminandes-llamigos.webm.audio.mp3.0000.mp3
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#EXTINF:10.004898,
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caminandes-llamigos.webm.audio.mp3.0001.mp3
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...
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for output:
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#EXT-X-BYTERANGE:132872@730
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*/
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$matches = null;
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if ( preg_match( '/^#EXTINF:\s*(\d+(?:\.\d+)?),/', $line, $matches ) ) {
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$duration = floatval( $matches[1] );
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}
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if ( preg_match( '/^#EXT-X-VERSION:(.*)/', $line, $matches ) ) {
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if ( intval( $matches[1] ) < 4 ) {
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$line = "#EXT-X-VERSION:7";
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}
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}
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if (preg_match( '/^#/', $line ) ) {
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$lines_out[] = $line;
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continue;
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}
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$filename = $line;
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$chunk = file_get_contents( $filename );
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if ( $process_mp3 ) {
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$chunk = process_mp3( $filename, $chunk, $pts );
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}
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$len = strlen( $chunk );
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$lines_out[] = "#EXT-X-BYTERANGE:$len@$offset";
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$lines_out[] = "$outfile";
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$chunks[] = $chunk;
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$offset += $len;
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$pts += $duration;
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$duration = 0;
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}
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file_put_contents( $outfile, implode( '', $chunks ) );
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file_put_contents( $playlist_out, implode( "\n", $lines_out ) ); |