text: /*
   * 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
   */
  
  #ifndef FFTOOLS_FFMPEG_H
  #define FFTOOLS_FFMPEG_H
  
  #include "config.h"
  
  #include <stdint.h>
  #include <stdio.h>
  #include <signal.h>
  
  #include "cmdutils.h"
  
  #include "libavformat/avformat.h"
  #include "libavformat/avio.h"
  
  #include "libavcodec/avcodec.h"
  
  #include "libavfilter/avfilter.h"
  
  #include "libavutil/avutil.h"
  #include "libavutil/dict.h"
  #include "libavutil/eval.h"
  #include "libavutil/fifo.h"
  #include "libavutil/hwcontext.h"
  #include "libavutil/pixfmt.h"
  #include "libavutil/rational.h"
  #include "libavutil/thread.h"
  #include "libavutil/threadmessage.h"
  
  #include "libswresample/swresample.h"
  
  #define VSYNC_AUTO       -1
  #define VSYNC_PASSTHROUGH 0
  #define VSYNC_CFR         1
  #define VSYNC_VFR         2
  #define VSYNC_VSCFR       0xfe
  #define VSYNC_DROP        0xff
  
  #define MAX_STREAMS 1024    /* arbitrary sanity check value */
  
  enum HWAccelID {
      HWACCEL_NONE = 0,
      HWACCEL_AUTO,
      HWACCEL_GENERIC,
      HWACCEL_VIDEOTOOLBOX,
      HWACCEL_QSV,
      HWACCEL_CUVID,
  };
  
  typedef struct HWAccel {
      const char *name;
      int (*init)(AVCodecContext *s);
      enum HWAccelID id;
      enum AVPixelFormat pix_fmt;
  } HWAccel;
  
  typedef struct HWDevice {
      const char *name;
      enum AVHWDeviceType type;
      AVBufferRef *device_ref;
  } HWDevice;
  
  /* select an input stream for an output stream */
  typedef struct StreamMap {
      int disabled;           /* 1 is this mapping is disabled by a negative map */
      int file_index;
      int stream_index;
      int sync_file_index;
      int sync_stream_index;
      char *linklabel;       /* name of an output link, for mapping lavfi outputs */
  } StreamMap;
  
  typedef struct {
      int  file_idx,  stream_idx,  channel_idx; // input
      int ofile_idx, ostream_idx;               // output
  } AudioChannelMap;
  
  typedef struct OptionsContext {
      OptionGroup *g;
  
      /* input/output options */
      int64_t start_time;
      int64_t start_time_eof;
      int seek_timestamp;
      const char *format;
  
      SpecifierOpt *codec_names;
      int        nb_codec_names;
      SpecifierOpt *audio_channels;
      int        nb_audio_channels;
      SpecifierOpt *audio_sample_rate;
      int        nb_audio_sample_rate;
      SpecifierOpt *frame_rates;
      int        nb_frame_rates;
      SpecifierOpt *frame_sizes;
      int        nb_frame_sizes;
      SpecifierOpt *frame_pix_fmts;
      int        nb_frame_pix_fmts;
  
      /* input options */
      int64_t input_ts_offset;
      int loop;
      int rate_emu;
      int accurate_seek;
      int thread_queue_size;
  
      SpecifierOpt *ts_scale;
      int        nb_ts_scale;
      SpecifierOpt *dump_attachment;
      int        nb_dump_attachment;
      SpecifierOpt *hwaccels;
      int        nb_hwaccels;
      SpecifierOpt *hwaccel_devices;
      int        nb_hwaccel_devices;
      SpecifierOpt *hwaccel_output_formats;
      int        nb_hwaccel_output_formats;
      SpecifierOpt *autorotate;
      int        nb_autorotate;
  
      /* output options */
      StreamMap *stream_maps;
      int     nb_stream_maps;
      AudioChannelMap *audio_channel_maps; /* one info entry per -map_channel */
      int           nb_audio_channel_maps; /* number of (valid) -map_channel settings */
      int metadata_global_manual;
      int metadata_streams_manual;
      int metadata_chapters_manual;
      const char **attachments;
      int       nb_attachments;
  
      int chapters_input_file;
  
      int64_t recording_time;
      int64_t stop_time;
      uint64_t limit_filesize;
      float mux_preload;
      float mux_max_delay;
      int shortest;
      int bitexact;
  
      int video_disable;
      int audio_disable;
      int subtitle_disable;
      int data_disable;
  
      /* indexed by output file stream index */
      int   *streamid_map;
      int nb_streamid_map;
  
      SpecifierOpt *metadata;
      int        nb_metadata;
      SpecifierOpt *max_frames;
      int        nb_max_frames;
      SpecifierOpt *bitstream_filters;
      int        nb_bitstream_filters;
      SpecifierOpt *codec_tags;
      int        nb_codec_tags;
      SpecifierOpt *sample_fmts;
      int        nb_sample_fmts;
      SpecifierOpt *qscale;
      int        nb_qscale;
      SpecifierOpt *forced_key_frames;
      int        nb_forced_key_frames;
      SpecifierOpt *force_fps;
      int        nb_force_fps;
      SpecifierOpt *frame_aspect_ratios;
      int        nb_frame_aspect_ratios;
      SpecifierOpt *rc_overrides;
      int        nb_rc_overrides;
      SpecifierOpt *intra_matrices;
      int        nb_intra_matrices;
      SpecifierOpt *inter_matrices;
      int        nb_inter_matrices;
      SpecifierOpt *chroma_intra_matrices;
      int        nb_chroma_intra_matrices;
      SpecifierOpt *top_field_first;
      int        nb_top_field_first;
      SpecifierOpt *metadata_map;
      int        nb_metadata_map;
      SpecifierOpt *presets;
      int        nb_presets;
      SpecifierOpt *copy_initial_nonkeyframes;
      int        nb_copy_initial_nonkeyframes;
      SpecifierOpt *copy_prior_start;
      int        nb_copy_prior_start;
      SpecifierOpt *filters;
      int        nb_filters;
      SpecifierOpt *filter_scripts;
      int        nb_filter_scripts;
      SpecifierOpt *reinit_filters;
      int        nb_reinit_filters;
      SpecifierOpt *fix_sub_duration;
      int        nb_fix_sub_duration;
      SpecifierOpt *canvas_sizes;
      int        nb_canvas_sizes;
      SpecifierOpt *pass;
      int        nb_pass;
      SpecifierOpt *passlogfiles;
      int        nb_passlogfiles;
      SpecifierOpt *max_muxing_queue_size;
      int        nb_max_muxing_queue_size;
      SpecifierOpt *guess_layout_max;
      int        nb_guess_layout_max;
      SpecifierOpt *apad;
      int        nb_apad;
      SpecifierOpt *discard;
      int        nb_discard;
      SpecifierOpt *disposition;
      int        nb_disposition;
      SpecifierOpt *program;
      int        nb_program;
      SpecifierOpt *time_bases;
      int        nb_time_bases;
      SpecifierOpt *enc_time_bases;
      int        nb_enc_time_bases;
  } OptionsContext;
  
  typedef struct InputFilter {
      AVFilterContext    *filter;
      struct InputStream *ist;
      struct FilterGraph *graph;
      uint8_t            *name;
      enum AVMediaType    type;   // AVMEDIA_TYPE_SUBTITLE for sub2video
  
      AVFifoBuffer *frame_queue;
  
      // parameters configured for this input
      int format;
  
      int width, height;
      AVRational sample_aspect_ratio;
  
      int sample_rate;
      int channels;
      uint64_t channel_layout;
  
      AVBufferRef *hw_frames_ctx;
  
      int eof;
  } InputFilter;
  
  typedef struct OutputFilter {
      AVFilterContext     *filter;
      struct OutputStream *ost;
      struct FilterGraph  *graph;
      uint8_t             *name;
  
      /* temporary storage until stream maps are processed */
      AVFilterInOut       *out_tmp;
      enum AVMediaType     type;
  
      /* desired output stream properties */
      int width, height;
      AVRational frame_rate;
      int format;
      int sample_rate;
      uint64_t channel_layout;
  
      // those are only set if no format is specified and the encoder gives us multiple options
      int *formats;
      uint64_t *channel_layouts;
      int *sample_rates;
  } OutputFilter;
  
  typedef struct FilterGraph {
      int            index;
      const char    *graph_desc;
  
      AVFilterGraph *graph;
      int reconfiguration;
  
      InputFilter   **inputs;
      int          nb_inputs;
      OutputFilter **outputs;
      int         nb_outputs;
  } FilterGraph;
  
  typedef struct InputStream {
      int file_index;
      AVStream *st;
      int discard;             /* true if stream data should be discarded */
      int user_set_discard;
      int decoding_needed;     /* non zero if the packets must be decoded in 'raw_fifo', see DECODING_FOR_* */
  #define DECODING_FOR_OST    1
  #define DECODING_FOR_FILTER 2
  
      AVCodecContext *dec_ctx;
      AVCodec *dec;
      AVFrame *decoded_frame;
      AVFrame *filter_frame; /* a ref of decoded_frame, to be sent to filters */
  
      int64_t       start;     /* time when read started */
      /* predicted dts of the next packet read for this stream or (when there are
       * several frames in a packet) of the next frame in current packet (in AV_TIME_BASE units) */
      int64_t       next_dts;
      int64_t       dts;       ///< dts of the last packet read for this stream (in AV_TIME_BASE units)
  
      int64_t       next_pts;  ///< synthetic pts for the next decode frame (in AV_TIME_BASE units)
      int64_t       pts;       ///< current pts of the decoded frame  (in AV_TIME_BASE units)
      int           wrap_correction_done;
  
      int64_t filter_in_rescale_delta_last;
  
      int64_t min_pts; /* pts with the smallest value in a current stream */
      int64_t max_pts; /* pts with the higher value in a current stream */
  
      // when forcing constant input framerate through -r,
      // this contains the pts that will be given to the next decoded frame
      int64_t cfr_next_pts;
  
      int64_t nb_samples; /* number of samples in the last decoded audio frame before looping */
  
      double ts_scale;
      int saw_first_ts;
      AVDictionary *decoder_opts;
      AVRational framerate;               /* framerate forced with -r */
      int top_field_first;
      int guess_layout_max;
  
      int autorotate;
  
      int fix_sub_duration;
      struct { /* previous decoded subtitle and related variables */
          int got_output;
          int ret;
          AVSubtitle subtitle;
      } prev_sub;
  
      struct sub2video {
          int64_t last_pts;
          int64_t end_pts;
          AVFifoBuffer *sub_queue;    ///< queue of AVSubtitle* before filter init
          AVFrame *frame;
          int w, h;
      } sub2video;
  
      int dr1;
  
      /* decoded data from this stream goes into all those filters
       * currently video and audio only */
      InputFilter **filters;
      int        nb_filters;
  
      int reinit_filters;
  
      /* hwaccel options */
      enum HWAccelID hwaccel_id;
      enum AVHWDeviceType hwaccel_device_type;
      char  *hwaccel_device;
      enum AVPixelFormat hwaccel_output_format;
  
      /* hwaccel context */
      void  *hwaccel_ctx;
      void (*hwaccel_uninit)(AVCodecContext *s);
      int  (*hwaccel_get_buffer)(AVCodecContext *s, AVFrame *frame, int flags);
      int  (*hwaccel_retrieve_data)(AVCodecContext *s, AVFrame *frame);
      enum AVPixelFormat hwaccel_pix_fmt;
      enum AVPixelFormat hwaccel_retrieved_pix_fmt;
      AVBufferRef *hw_frames_ctx;
  
      /* stats */
      // combined size of all the packets read
      uint64_t data_size;
      /* number of packets successfully read for this stream */
      uint64_t nb_packets;
      // number of frames/samples retrieved from the decoder
      uint64_t frames_decoded;
      uint64_t samples_decoded;
  
      int64_t *dts_buffer;
      int nb_dts_buffer;
  
      int got_output;
  } InputStream;
  
  typedef struct InputFile {
      AVFormatContext *ctx;
      int eof_reached;      /* true if eof reached */
      int eagain;           /* true if last read attempt returned EAGAIN */
      int ist_index;        /* index of first stream in input_streams */
      int loop;             /* set number of times input stream should be looped */
      int64_t duration;     /* actual duration of the longest stream in a file
                               at the moment when looping happens */
      AVRational time_base; /* time base of the duration */
      int64_t input_ts_offset;
  
      int64_t ts_offset;
      int64_t last_ts;
      int64_t start_time;   /* user-specified start time in AV_TIME_BASE or AV_NOPTS_VALUE */
      int seek_timestamp;
      int64_t recording_time;
      int nb_streams;       /* number of stream that ffmpeg is aware of; may be different
                               from ctx.nb_streams if new streams appear during av_read_frame() */
      int nb_streams_warn;  /* number of streams that the user was warned of */
      int rate_emu;
      int accurate_seek;
  
  #if HAVE_THREADS
      AVThreadMessageQueue *in_thread_queue;
      pthread_t thread;           /* thread reading from this file */
      int non_blocking;           /* reading packets from the thread should not block */
      int joined;                 /* the thread has been joined */
      int thread_queue_size;      /* maximum number of queued packets */
  #endif
  } InputFile;
  
  enum forced_keyframes_const {
      FKF_N,
      FKF_N_FORCED,
      FKF_PREV_FORCED_N,
      FKF_PREV_FORCED_T,
      FKF_T,
      FKF_NB
  };
  
  #define ABORT_ON_FLAG_EMPTY_OUTPUT (1 <<  0)
  
  extern const char *const forced_keyframes_const_names[];
  
  typedef enum {
      ENCODER_FINISHED = 1,
      MUXER_FINISHED = 2,
  } OSTFinished ;
  
  typedef struct OutputStream {
      int file_index;          /* file index */
      int index;               /* stream index in the output file */
      int source_index;        /* InputStream index */
      AVStream *st;            /* stream in the output file */
      int encoding_needed;     /* true if encoding needed for this stream */
      int frame_number;
      /* input pts and corresponding output pts
         for A/V sync */
      struct InputStream *sync_ist; /* input stream to sync against */
      int64_t sync_opts;       /* output frame counter, could be changed to some true timestamp */ // FIXME look at frame_number
      /* pts of the first frame encoded for this stream, used for limiting
       * recording time */
      int64_t first_pts;
      /* dts of the last packet sent to the muxer */
      int64_t last_mux_dts;
      // the timebase of the packets sent to the muxer
      AVRational mux_timebase;
      AVRational enc_timebase;
  
      int                    nb_bitstream_filters;
      AVBSFContext            **bsf_ctx;
  
      AVCodecContext *enc_ctx;
      AVCodecParameters *ref_par; /* associated input codec parameters with encoders options applied */
      AVCodec *enc;
      int64_t max_frames;
      AVFrame *filtered_frame;
      AVFrame *last_frame;
      int last_dropped;
      int last_nb0_frames[3];
  
      void  *hwaccel_ctx;
  
      /* video only */
      AVRational frame_rate;
      int is_cfr;
      int force_fps;
      int top_field_first;
      int rotate_overridden;
      double rotate_override_value;
  
      AVRational frame_aspect_ratio;
  
      /* forced key frames */
      int64_t forced_kf_ref_pts;
      int64_t *forced_kf_pts;
      int forced_kf_count;
      int forced_kf_index;
      char *forced_keyframes;
      AVExpr *forced_keyframes_pexpr;
      double forced_keyframes_expr_const_values[FKF_NB];
  
      /* audio only */
      int *audio_channels_map;             /* list of the channels id to pick from the source stream */
      int audio_channels_mapped;           /* number of channels in audio_channels_map */
  
      char *logfile_prefix;
      FILE *logfile;
  
      OutputFilter *filter;
      char *avfilter;
      char *filters;         ///< filtergraph associated to the -filter option
      char *filters_script;  ///< filtergraph script associated to the -filter_script option
  
      AVDictionary *encoder_opts;
      AVDictionary *sws_dict;
      AVDictionary *swr_opts;
      AVDictionary *resample_opts;
      char *apad;
      OSTFinished finished;        /* no more packets should be written for this stream */
      int unavailable;                     /* true if the steram is unavailable (possibly temporarily) */
      int stream_copy;
  
      // init_output_stream() has been called for this stream
      // The encoder and the bitstream filters have been initialized and the stream
      // parameters are set in the AVStream.
      int initialized;
  
      int inputs_done;
  
      const char *attachment_filename;
      int copy_initial_nonkeyframes;
      int copy_prior_start;
      char *disposition;
  
      int keep_pix_fmt;
  
      /* stats */
      // combined size of all the packets written
      uint64_t data_size;
      // number of packets send to the muxer
      uint64_t packets_written;
      // number of frames/samples sent to the encoder
      uint64_t frames_encoded;
      uint64_t samples_encoded;
  
      /* packet quality factor */
      int quality;
  
      int max_muxing_queue_size;
  
      /* the packets are buffered here until the muxer is ready to be initialized */
      AVFifoBuffer *muxing_queue;
  
      /* packet picture type */
      int pict_type;
  
      /* frame encode sum of squared error values */
      int64_t error[4];
  } OutputStream;
  
  typedef struct OutputFile {
      AVFormatContext *ctx;
      AVDictionary *opts;
      int ost_index;       /* index of the first stream in output_streams */
      int64_t recording_time;  ///< desired length of the resulting file in microseconds == AV_TIME_BASE units
      int64_t start_time;      ///< start time in microseconds == AV_TIME_BASE units
      uint64_t limit_filesize; /* filesize limit expressed in bytes */
  
      int shortest;
  
      int header_written;
  } OutputFile;
  
  extern InputStream **input_streams;
  extern int        nb_input_streams;
  extern InputFile   **input_files;
  extern int        nb_input_files;
  
  extern OutputStream **output_streams;
  extern int         nb_output_streams;
  extern OutputFile   **output_files;
  extern int         nb_output_files;
  
  extern FilterGraph **filtergraphs;
  extern int        nb_filtergraphs;
  
  extern char *vstats_filename;
  extern char *sdp_filename;
  
  extern float audio_drift_threshold;
  extern float dts_delta_threshold;
  extern float dts_error_threshold;
  
  extern int audio_volume;
  extern int audio_sync_method;
  extern int video_sync_method;
  extern float frame_drop_threshold;
  extern int do_benchmark;
  extern int do_benchmark_all;
  extern int do_deinterlace;
  extern int do_hex_dump;
  extern int do_pkt_dump;
  extern int copy_ts;
  extern int start_at_zero;
  extern int copy_tb;
  extern int debug_ts;
  extern int exit_on_error;
  extern int abort_on_flags;
  extern int print_stats;
  extern int qp_hist;
  extern int stdin_interaction;
  extern int frame_bits_per_raw_sample;
  extern AVIOContext *progress_avio;
  extern float max_error_rate;
  extern char *videotoolbox_pixfmt;
  
  extern int filter_nbthreads;
  extern int filter_complex_nbthreads;
  extern int vstats_version;
  
  extern int64_t duration;
  
  extern const AVIOInterruptCB int_cb;
  
  extern const OptionDef options[];
  extern const HWAccel hwaccels[];
  extern AVBufferRef *hw_device_ctx;
  #if CONFIG_QSV
  extern char *qsv_device;
  #endif
  extern HWDevice *filter_hw_device;
  
  
  void term_init(void);
  void term_exit(void);
  
  void reset_options(OptionsContext *o, int is_input);
  void show_usage(void);
  
  void opt_output_file(void *optctx, const char *filename);
  
  void remove_avoptions(AVDictionary **a, AVDictionary *b);
  void assert_avoptions(AVDictionary *m);
  
  int guess_input_channel_layout(InputStream *ist);
  
  enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *avctx, AVCodec *codec, enum AVPixelFormat target);
  void choose_sample_fmt(AVStream *st, AVCodec *codec);
  
  int configure_filtergraph(FilterGraph *fg);
  int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out);
  void check_filter_outputs(void);
  int ist_in_filtergraph(FilterGraph *fg, InputStream *ist);
  int filtergraph_is_simple(FilterGraph *fg);
  int init_simple_filtergraph(InputStream *ist, OutputStream *ost);
  int init_complex_filtergraph(FilterGraph *fg);
  
  void sub2video_update(InputStream *ist, AVSubtitle *sub);
  
  int ifilter_parameters_from_frame(InputFilter *ifilter, const AVFrame *frame);
  
  int ffmpeg_parse_options(int argc, char **argv);
  
  int videotoolbox_init(AVCodecContext *s);
  int qsv_init(AVCodecContext *s);
  int cuvid_init(AVCodecContext *s);
  
  HWDevice *hw_device_get_by_name(const char *name);
  int hw_device_init_from_string(const char *arg, HWDevice **dev);
  void hw_device_free_all(void);
  
  int hw_device_setup_for_decode(InputStream *ist);
  int hw_device_setup_for_encode(OutputStream *ost);
  
  int hwaccel_decode_init(AVCodecContext *avctx);
  
  int ffmpeg_exec(int argc, char **argv);
  
  void ffmpeg_cancel();
  
  #endif /* FFTOOLS_FFMPEG_H */
  