Francois Cartegnie
11 years ago
9 changed files with 173 additions and 225 deletions
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/*****************************************************************************
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* pes.h: PES Packet helpers |
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***************************************************************************** |
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* Copyright (C) 2004-2015 VLC authors and VideoLAN |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation; either version 2.1 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with this program; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA. |
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*****************************************************************************/ |
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#define FROM_SCALE_NZ(x) ((x) * 100 / 9) |
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#define TO_SCALE_NZ(x) ((x) * 9 / 100) |
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#define FROM_SCALE(x) (VLC_TS_0 + FROM_SCALE_NZ(x)) |
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#define TO_SCALE(x) TO_SCALE_NZ((x) - VLC_TS_0) |
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static inline mtime_t ExtractPESTimestamp( const uint8_t *p_data ) |
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{ |
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return ((mtime_t)(p_data[ 0]&0x0e ) << 29)| |
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(mtime_t)(p_data[1] << 22)| |
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((mtime_t)(p_data[2]&0xfe) << 14)| |
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(mtime_t)(p_data[3] << 7)| |
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(mtime_t)(p_data[4] >> 1); |
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} |
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static inline mtime_t ExtractMPEG1PESTimestamp( const uint8_t *p_data ) |
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{ |
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return ((mtime_t)(p_data[ 0]&0x38 ) << 27)| |
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((mtime_t)(p_data[0]&0x03 ) << 28)| |
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(mtime_t)(p_data[1] << 20)| |
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((mtime_t)(p_data[2]&0xf8 ) << 12)| |
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((mtime_t)(p_data[2]&0x03 ) << 13)| |
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(mtime_t)(p_data[3] << 5) | |
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(mtime_t)(p_data[4] >> 3); |
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} |
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static int ParsePESHeader( vlc_object_t *p_object, const uint8_t *p_header, size_t i_header, |
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unsigned *pi_skip, mtime_t *pi_dts, mtime_t *pi_pts, |
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uint8_t *pi_stream_id ) |
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{ |
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unsigned i_skip; |
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if ( i_header < 9 ) |
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return VLC_EGENERIC; |
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*pi_stream_id = p_header[3]; |
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switch( p_header[3] ) |
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{ |
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case 0xBC: /* Program stream map */ |
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case 0xBE: /* Padding */ |
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case 0xBF: /* Private stream 2 */ |
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case 0xF0: /* ECM */ |
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case 0xF1: /* EMM */ |
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case 0xFF: /* Program stream directory */ |
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case 0xF2: /* DSMCC stream */ |
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case 0xF8: /* ITU-T H.222.1 type E stream */ |
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i_skip = 6; |
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break; |
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default: |
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if( ( p_header[6]&0xC0 ) == 0x80 ) |
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{ |
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/* mpeg2 PES */ |
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i_skip = p_header[8] + 9; |
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if( p_header[7]&0x80 ) /* has pts */ |
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{ |
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if( i_header < 9 + 5 ) |
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return VLC_EGENERIC; |
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*pi_pts = ExtractPESTimestamp( &p_header[9] ); |
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if( p_header[7]&0x40 ) /* has dts */ |
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{ |
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if( i_header < 14 + 5 ) |
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return VLC_EGENERIC; |
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*pi_dts = ExtractPESTimestamp( &p_header[14] ); |
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} |
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} |
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} |
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else |
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{ |
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i_skip = 6; |
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if( i_header < i_skip + 1 ) |
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return VLC_EGENERIC; |
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while( i_skip < 23 && p_header[i_skip] == 0xff ) |
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{ |
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i_skip++; |
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if( i_header < i_skip + 1 ) |
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return VLC_EGENERIC; |
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} |
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if( i_skip == 23 ) |
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{ |
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msg_Err( p_object, "too much MPEG-1 stuffing" ); |
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return VLC_EGENERIC; |
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} |
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if( ( p_header[i_skip] & 0xC0 ) == 0x40 ) |
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{ |
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i_skip += 2; |
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} |
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if( i_header < i_skip + 1 ) |
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return VLC_EGENERIC; |
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if( p_header[i_skip]&0x20 ) |
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{ |
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if( i_header < i_skip + 5 ) |
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return VLC_EGENERIC; |
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*pi_pts = ExtractPESTimestamp( &p_header[i_skip] ); |
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if( p_header[i_skip]&0x10 ) /* has dts */ |
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{ |
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if( i_header < i_skip + 10 ) |
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return VLC_EGENERIC; |
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*pi_dts = ExtractPESTimestamp( &p_header[i_skip+5] ); |
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i_skip += 10; |
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} |
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else |
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{ |
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i_skip += 5; |
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} |
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} |
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else |
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{ |
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i_skip += 1; |
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} |
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} |
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break; |
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} |
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*pi_skip = i_skip; |
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return VLC_SUCCESS; |
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} |
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