libavformat/avformat_internal.h

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 /*
  20  * APIs internal to the generic avformat layer.
  21  *
  22  * MUST NOT be included by individual muxers or demuxers.
  23  */
  24
  25 #ifndef AVFORMAT_AVFORMAT_INTERNAL_H
  26 #define AVFORMAT_AVFORMAT_INTERNAL_H
  27
  28 #include <stdint.h>
  29
  30 #include "avformat.h"
  31 #include "internal.h"
  32
  33 typedef struct FormatContextInternal {
  34     FFFormatContext fc;
  35
  36     union {
  37         // muxing only
  38         struct {
  39             /**
  40              * Whether or not avformat_init_output has already been called
  41              */
  42             int initialized;
  43
  44             /**
  45              * Whether or not avformat_init_output fully initialized streams
  46              */
  47             int streams_initialized;
  48
  49
  50             /**
  51              * Number of streams relevant for interleaving.
  52              * Muxing only.
  53              */
  54             int nb_interleaved_streams;
  55
  56             /**
  57              * The interleavement function in use. Always set.
  58              */
  59             int (*interleave_packet)(struct AVFormatContext *s, AVPacket *pkt,
  60                                      int flush, int has_packet);
  61
  62 #if FF_API_COMPUTE_PKT_FIELDS2
  63             int missing_ts_warning;
  64 #endif
  65         };
  66
  67         // demuxing only
  68         struct {
  69             /**
  70              * Raw packets from the demuxer, prior to parsing and decoding.
  71              * This buffer is used for buffering packets until the codec can
  72              * be identified, as parsing cannot be done without knowing the
  73              * codec.
  74              */
  75             PacketList raw_packet_buffer;
  76
  77             /**
  78              * Sum of the size of packets in raw_packet_buffer, in bytes.
  79              */
  80             int raw_packet_buffer_size;
  81
  82             /**
  83              * Packets split by the parser get queued here.
  84              */
  85             PacketList parse_queue;
  86
  87             /**
  88              * Contexts and child contexts do not contain a metadata option
  89              */
  90             int metafree;
  91
  92             /**
  93              * Set if chapter ids are strictly monotonic.
  94              */
  95             int chapter_ids_monotonic;
  96         };
  97     };
  98 } FormatContextInternal;
  99
 100 static av_always_inline FormatContextInternal *ff_fc_internal(AVFormatContext *s)
 101 {
 102     return (FormatContextInternal*)s;
 103 }
 104
 105 #define RELATIVE_TS_BASE (INT64_MAX - (1LL << 48))
 106
 107 static av_always_inline int is_relative(int64_t ts)
 108 {
 109     return ts > (RELATIVE_TS_BASE - (1LL << 48));
 110 }
 111
 112 /**
 113  * Wrap a given time stamp, if there is an indication for an overflow
 114  *
 115  * @param st stream
 116  * @param timestamp the time stamp to wrap
 117  * @return resulting time stamp
 118  */
 119 int64_t ff_wrap_timestamp(const AVStream *st, int64_t timestamp);
 120
 121 typedef struct FFStreamGroup {
 122     /**
 123      * The public context.
 124      */
 125     AVStreamGroup pub;
 126
 127     AVFormatContext *fmtctx;
 128 } FFStreamGroup;
 129
 130 static av_always_inline FFStreamGroup *ffstreamgroup(AVStreamGroup *stg)
 131 {
 132     return (FFStreamGroup*)stg;
 133 }
 134
 135 static av_always_inline const FFStreamGroup *cffstreamgroup(const AVStreamGroup *stg)
 136 {
 137     return (const FFStreamGroup*)stg;
 138 }
 139
 140 void ff_flush_packet_queue(AVFormatContext *s);
 141
 142 const struct AVCodec *ff_find_decoder(AVFormatContext *s, const AVStream *st,
 143                                       enum AVCodecID codec_id);
 144
 145 /**
 146  * Frees a stream without modifying the corresponding AVFormatContext.
 147  * Must only be called if the latter doesn't matter or if the stream
 148  * is not yet attached to an AVFormatContext.
 149  */
 150 void ff_free_stream(AVStream **st);
 151
 152 /**
 153  * Frees a stream group without modifying the corresponding AVFormatContext.
 154  * Must only be called if the latter doesn't matter or if the stream
 155  * is not yet attached to an AVFormatContext.
 156  */
 157 void ff_free_stream_group(AVStreamGroup **pstg);
 158
 159 int ff_is_intra_only(enum AVCodecID id);
 160
 161 struct FFOutputFormat;
 162 struct FFInputFormat;
 163 void avpriv_register_devices(const struct FFOutputFormat * const o[],
 164                              const struct FFInputFormat * const i[]);
 165
 166 #endif // AVFORMAT_AVFORMAT_INTERNAL_H