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 AVFORMAT_FFM_H
  23 #define AVFORMAT_FFM_H
  24
  25 #include <stdint.h>
  26 #include "avformat.h"
  27 #include "avio.h"
  28
  29 /* The FFM file is made of blocks of fixed size */
  30 #define FFM_HEADER_SIZE 14
  31 #define PACKET_ID       0x666d
  32
  33 /* each packet contains frames (which can span several packets */
  34 #define FRAME_HEADER_SIZE    16
  35 #define FLAG_KEY_FRAME       0x01
  36 #define FLAG_DTS             0x02
  37
  38 enum {
  39     READ_HEADER,
  40     READ_DATA,
  41 };
  42
  43 typedef struct FFMContext {
  44     /* only reading mode */
  45     int64_t write_index, file_size;
  46     int read_state;
  47     uint8_t header[FRAME_HEADER_SIZE+4];
  48
  49     /* read and write */
  50     int first_packet; /* true if first packet, needed to set the discontinuity tag */
  51     int packet_size;
  52     int frame_offset;
  53     int64_t dts;
  54     uint8_t *packet_ptr, *packet_end;
  55     uint8_t packet[FFM_PACKET_SIZE];
  56 } FFMContext;
  57
  58 #endif /* AVFORMAT_FFM_H */