text: /*
   * FLV common header
   *
   * Copyright (c) 2006 The FFmpeg Project
   *
   * This file is part of FFmpeg.
   *
   * FFmpeg is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * FFmpeg is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with FFmpeg; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  /**
   * @file
   * FLV common header
   */
  
  #ifndef AVFORMAT_FLV_H
  #define AVFORMAT_FLV_H
  
  /* offsets for packed values */
  #define FLV_AUDIO_SAMPLESSIZE_OFFSET 1
  #define FLV_AUDIO_SAMPLERATE_OFFSET  2
  #define FLV_AUDIO_CODECID_OFFSET     4
  
  #define FLV_VIDEO_FRAMETYPE_OFFSET   4
  
  /* bitmasks to isolate specific values */
  #define FLV_AUDIO_CHANNEL_MASK    0x01
  #define FLV_AUDIO_SAMPLESIZE_MASK 0x02
  #define FLV_AUDIO_SAMPLERATE_MASK 0x0c
  #define FLV_AUDIO_CODECID_MASK    0xf0
  
  #define FLV_VIDEO_CODECID_MASK    0x0f
  #define FLV_VIDEO_FRAMETYPE_MASK  0xf0
  
  #define AMF_END_OF_OBJECT         0x09
  
  #define KEYFRAMES_TAG            "keyframes"
  #define KEYFRAMES_TIMESTAMP_TAG  "times"
  #define KEYFRAMES_BYTEOFFSET_TAG "filepositions"
  
  
  enum {
      FLV_HEADER_FLAG_HASVIDEO = 1,
      FLV_HEADER_FLAG_HASAUDIO = 4,
  };
  
  enum FlvTagType {
      FLV_TAG_TYPE_AUDIO = 0x08,
      FLV_TAG_TYPE_VIDEO = 0x09,
      FLV_TAG_TYPE_META  = 0x12,
  };
  
  enum {
      FLV_STREAM_TYPE_VIDEO,
      FLV_STREAM_TYPE_AUDIO,
      FLV_STREAM_TYPE_SUBTITLE,
      FLV_STREAM_TYPE_DATA,
      FLV_STREAM_TYPE_NB,
  };
  
  enum {
      FLV_MONO   = 0,
      FLV_STEREO = 1,
  };
  
  enum {
      FLV_SAMPLESSIZE_8BIT  = 0,
      FLV_SAMPLESSIZE_16BIT = 1 << FLV_AUDIO_SAMPLESSIZE_OFFSET,
  };
  
  enum {
      FLV_SAMPLERATE_SPECIAL = 0, /**< signifies 5512Hz and 8000Hz in the case of NELLYMOSER */
      FLV_SAMPLERATE_11025HZ = 1 << FLV_AUDIO_SAMPLERATE_OFFSET,
      FLV_SAMPLERATE_22050HZ = 2 << FLV_AUDIO_SAMPLERATE_OFFSET,
      FLV_SAMPLERATE_44100HZ = 3 << FLV_AUDIO_SAMPLERATE_OFFSET,
  };
  
  enum {
      FLV_CODECID_PCM                  = 0,
      FLV_CODECID_ADPCM                = 1 << FLV_AUDIO_CODECID_OFFSET,
      FLV_CODECID_MP3                  = 2 << FLV_AUDIO_CODECID_OFFSET,
      FLV_CODECID_PCM_LE               = 3 << FLV_AUDIO_CODECID_OFFSET,
      FLV_CODECID_NELLYMOSER_16KHZ_MONO = 4 << FLV_AUDIO_CODECID_OFFSET,
      FLV_CODECID_NELLYMOSER_8KHZ_MONO = 5 << FLV_AUDIO_CODECID_OFFSET,
      FLV_CODECID_NELLYMOSER           = 6 << FLV_AUDIO_CODECID_OFFSET,
      FLV_CODECID_PCM_ALAW             = 7 << FLV_AUDIO_CODECID_OFFSET,
      FLV_CODECID_PCM_MULAW            = 8 << FLV_AUDIO_CODECID_OFFSET,
      FLV_CODECID_OPUS                 = 9 << FLV_AUDIO_CODECID_OFFSET,
      FLV_CODECID_AAC                  = 10<< FLV_AUDIO_CODECID_OFFSET,
      FLV_CODECID_SPEEX                = 11<< FLV_AUDIO_CODECID_OFFSET,
  };
  
  enum {
      FLV_CODECID_H263    = 2,
      FLV_CODECID_SCREEN  = 3,
      FLV_CODECID_VP6     = 4,
      FLV_CODECID_VP6A    = 5,
      FLV_CODECID_SCREEN2 = 6,
      FLV_CODECID_H264    = 7,
      FLV_CODECID_REALH263= 8,
      FLV_CODECID_MPEG4   = 9,
      FLV_CODECID_HEVC    = 12,
      FLV_CODECID_AV1     = 13,
      FLV_CODECID_VP8     = 14,
      FLV_CODECID_VP9     = 15,
  };
  
  enum {
      FLV_FRAME_KEY            = 1 << FLV_VIDEO_FRAMETYPE_OFFSET, ///< key frame (for AVC, a seekable frame)
      FLV_FRAME_INTER          = 2 << FLV_VIDEO_FRAMETYPE_OFFSET, ///< inter frame (for AVC, a non-seekable frame)
      FLV_FRAME_DISP_INTER     = 3 << FLV_VIDEO_FRAMETYPE_OFFSET, ///< disposable inter frame (H.263 only)
      FLV_FRAME_GENERATED_KEY  = 4 << FLV_VIDEO_FRAMETYPE_OFFSET, ///< generated key frame (reserved for server use only)
      FLV_FRAME_VIDEO_INFO_CMD = 5 << FLV_VIDEO_FRAMETYPE_OFFSET, ///< video info/command frame
  };
  
  typedef enum {
      AMF_DATA_TYPE_NUMBER      = 0x00,
      AMF_DATA_TYPE_BOOL        = 0x01,
      AMF_DATA_TYPE_STRING      = 0x02,
      AMF_DATA_TYPE_OBJECT      = 0x03,
      AMF_DATA_TYPE_NULL        = 0x05,
      AMF_DATA_TYPE_UNDEFINED   = 0x06,
      AMF_DATA_TYPE_REFERENCE   = 0x07,
      AMF_DATA_TYPE_MIXEDARRAY  = 0x08,
      AMF_DATA_TYPE_OBJECT_END  = 0x09,
      AMF_DATA_TYPE_ARRAY       = 0x0a,
      AMF_DATA_TYPE_DATE        = 0x0b,
      AMF_DATA_TYPE_LONG_STRING = 0x0c,
      AMF_DATA_TYPE_UNSUPPORTED = 0x0d,
  } AMFDataType;
  
  #endif /* AVFORMAT_FLV_H */
  