libavformat/ffm.h

   1 /*
   2  * FFM (ffserver live feed) common header
   3  * Copyright (c) 2001 Fabrice Bellard.
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #ifndef FFMPEG_FFM_H
  23 #define FFMPEG_FFM_H
  24
  25 #include "avformat.h"
  26
  27 /* The FFM file is made of blocks of fixed size */
  28 #define FFM_HEADER_SIZE 14
  29 #define PACKET_ID       0x666d
  30
  31 /* each packet contains frames (which can span several packets */
  32 #define FRAME_HEADER_SIZE    16
  33 #define FLAG_KEY_FRAME       0x01
  34 #define FLAG_DTS             0x02
  35
  36 enum {
  37     READ_HEADER,
  38     READ_DATA,
  39 };
  40
  41 typedef struct FFMContext {
  42     /* only reading mode */
  43     offset_t write_index, file_size;
  44     int read_state;
  45     uint8_t header[FRAME_HEADER_SIZE+4];
  46
  47     /* read and write */
  48     int first_packet; /* true if first packet, needed to set the discontinuity tag */
  49     int packet_size;
  50     int frame_offset;
  51     int64_t dts;
  52     uint8_t *packet_ptr, *packet_end;
  53     uint8_t packet[FFM_PACKET_SIZE];
  54 } FFMContext;
  55
  56 #endif /* FFMPEG_FFM_H */