FFmpeg/fftools/ffmpeg.h

/*
 * 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 <stdatomic.h>
#include <stdint.h>
#include <stdio.h>
#include <signal.h>

#include "cmdutils.h"
#include "ffmpeg_sched.h"
#include "sync_queue.h"

#include "libavformat/avformat.h"
#include "libavformat/avio.h"

#include "libavcodec/avcodec.h"
#include "libavcodec/bsf.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"

// deprecated features
#define FFMPEG_OPT_PSNR 1
#define FFMPEG_OPT_MAP_CHANNEL 1
#define FFMPEG_OPT_MAP_SYNC 1
#define FFMPEG_ROTATION_METADATA 1
#define FFMPEG_OPT_QPHIST 1
#define FFMPEG_OPT_ADRIFT_THRESHOLD 1
#define FFMPEG_OPT_ENC_TIME_BASE_NUM 1
#define FFMPEG_OPT_TOP 1
#define FFMPEG_OPT_FORCE_KF_SOURCE_NO_DROP 1
#define FFMPEG_OPT_VSYNC_DROP 1
#define FFMPEG_OPT_VSYNC 1
#define FFMPEG_OPT_FILTER_SCRIPT 1

#define FFMPEG_ERROR_RATE_EXCEEDED FFERRTAG('E', 'R', 'E', 'D')

enum VideoSyncMethod {
    VSYNC_AUTO = -1,
    VSYNC_PASSTHROUGH,
    VSYNC_CFR,
    VSYNC_VFR,
    VSYNC_VSCFR,
#if FFMPEG_OPT_VSYNC_DROP
    VSYNC_DROP,
#endif
};

enum EncTimeBase {
    ENC_TIME_BASE_DEMUX  = -1,
    ENC_TIME_BASE_FILTER = -2,
};

enum HWAccelID {
    HWACCEL_NONE = 0,
    HWACCEL_AUTO,
    HWACCEL_GENERIC,
};

enum FrameOpaque {
    FRAME_OPAQUE_SUB_HEARTBEAT = 1,
    FRAME_OPAQUE_EOF,
    FRAME_OPAQUE_SEND_COMMAND,
};

enum PacketOpaque {
    PKT_OPAQUE_SUB_HEARTBEAT = 1,
    PKT_OPAQUE_FIX_SUB_DURATION,
};

enum LatencyProbe {
    LATENCY_PROBE_DEMUX,
    LATENCY_PROBE_DEC_PRE,
    LATENCY_PROBE_DEC_POST,
    LATENCY_PROBE_FILTER_PRE,
    LATENCY_PROBE_FILTER_POST,
    LATENCY_PROBE_ENC_PRE,
    LATENCY_PROBE_ENC_POST,
    LATENCY_PROBE_NB,
};

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;
    char *linklabel;       /* name of an output link, for mapping lavfi outputs */
} StreamMap;

#if FFMPEG_OPT_MAP_CHANNEL
typedef struct {
    int  file_idx,  stream_idx,  channel_idx; // input
    int ofile_idx, ostream_idx;               // output
} AudioChannelMap;
#endif

typedef struct OptionsContext {
    OptionGroup *g;

    /* input/output options */
    int64_t start_time;
    int64_t start_time_eof;
    int seek_timestamp;
    const char *format;

    SpecifierOptList codec_names;
    SpecifierOptList audio_ch_layouts;
    SpecifierOptList audio_channels;
    SpecifierOptList audio_sample_rate;
    SpecifierOptList frame_rates;
    SpecifierOptList max_frame_rates;
    SpecifierOptList frame_sizes;
    SpecifierOptList frame_pix_fmts;

    /* input options */
    int64_t input_ts_offset;
    int loop;
    int rate_emu;
    float readrate;
    double readrate_initial_burst;
    int accurate_seek;
    int thread_queue_size;
    int input_sync_ref;
    int find_stream_info;

    SpecifierOptList ts_scale;
    SpecifierOptList dump_attachment;
    SpecifierOptList hwaccels;
    SpecifierOptList hwaccel_devices;
    SpecifierOptList hwaccel_output_formats;
    SpecifierOptList autorotate;

    /* output options */
    StreamMap *stream_maps;
    int     nb_stream_maps;
#if FFMPEG_OPT_MAP_CHANNEL
    AudioChannelMap *audio_channel_maps; /* one info entry per -map_channel */
    int           nb_audio_channel_maps; /* number of (valid) -map_channel settings */
#endif
    const char **attachments;
    int       nb_attachments;

    int chapters_input_file;

    int64_t recording_time;
    int64_t stop_time;
    int64_t limit_filesize;
    float mux_preload;
    float mux_max_delay;
    float shortest_buf_duration;
    int shortest;
    int bitexact;

    int video_disable;
    int audio_disable;
    int subtitle_disable;
    int data_disable;

    // keys are stream indices
    AVDictionary *streamid;

    SpecifierOptList metadata;
    SpecifierOptList max_frames;
    SpecifierOptList bitstream_filters;
    SpecifierOptList codec_tags;
    SpecifierOptList sample_fmts;
    SpecifierOptList qscale;
    SpecifierOptList forced_key_frames;
    SpecifierOptList fps_mode;
    SpecifierOptList force_fps;
    SpecifierOptList frame_aspect_ratios;
    SpecifierOptList display_rotations;
    SpecifierOptList display_hflips;
    SpecifierOptList display_vflips;
    SpecifierOptList rc_overrides;
    SpecifierOptList intra_matrices;
    SpecifierOptList inter_matrices;
    SpecifierOptList chroma_intra_matrices;
#if FFMPEG_OPT_TOP
    SpecifierOptList top_field_first;
#endif
    SpecifierOptList metadata_map;
    SpecifierOptList presets;
    SpecifierOptList copy_initial_nonkeyframes;
    SpecifierOptList copy_prior_start;
    SpecifierOptList filters;
#if FFMPEG_OPT_FILTER_SCRIPT
    SpecifierOptList filter_scripts;
#endif
    SpecifierOptList reinit_filters;
    SpecifierOptList fix_sub_duration;
    SpecifierOptList fix_sub_duration_heartbeat;
    SpecifierOptList canvas_sizes;
    SpecifierOptList pass;
    SpecifierOptList passlogfiles;
    SpecifierOptList max_muxing_queue_size;
    SpecifierOptList muxing_queue_data_threshold;
    SpecifierOptList guess_layout_max;
    SpecifierOptList apad;
    SpecifierOptList discard;
    SpecifierOptList disposition;
    SpecifierOptList program;
    SpecifierOptList stream_groups;
    SpecifierOptList time_bases;
    SpecifierOptList enc_time_bases;
    SpecifierOptList autoscale;
    SpecifierOptList bits_per_raw_sample;
    SpecifierOptList enc_stats_pre;
    SpecifierOptList enc_stats_post;
    SpecifierOptList mux_stats;
    SpecifierOptList enc_stats_pre_fmt;
    SpecifierOptList enc_stats_post_fmt;
    SpecifierOptList mux_stats_fmt;
} OptionsContext;

typedef struct InputFilter {
    struct FilterGraph *graph;
    uint8_t            *name;
} InputFilter;

typedef struct OutputFilter {
    struct OutputStream *ost;
    struct FilterGraph  *graph;
    uint8_t             *name;

    /* for filters that are not yet bound to an output stream,
     * this stores the output linklabel, if any */
    uint8_t             *linklabel;

    enum AVMediaType     type;

    atomic_uint_least64_t nb_frames_dup;
    atomic_uint_least64_t nb_frames_drop;
} OutputFilter;

typedef struct FilterGraph {
    const AVClass *class;
    int            index;

    InputFilter   **inputs;
    int          nb_inputs;
    OutputFilter **outputs;
    int         nb_outputs;
} FilterGraph;

enum DecoderFlags {
    DECODER_FLAG_FIX_SUB_DURATION = (1 << 0),
    // input timestamps are unreliable (guessed by demuxer)
    DECODER_FLAG_TS_UNRELIABLE    = (1 << 1),
};

typedef struct DecoderOpts {
    /* hwaccel options */
    enum HWAccelID              hwaccel_id;
    enum AVHWDeviceType         hwaccel_device_type;
    char                       *hwaccel_device;
    enum AVPixelFormat          hwaccel_output_format;
} DecoderOpts;

typedef struct Decoder {
    const AVClass   *class;

    const uint8_t   *subtitle_header;
    int              subtitle_header_size;

    // number of frames/samples retrieved from the decoder
    uint64_t         frames_decoded;
    uint64_t         samples_decoded;
    uint64_t         decode_errors;
} Decoder;

typedef struct InputStream {
    const AVClass *class;

    /* parent source */
    struct InputFile *file;

    int index;

    AVStream *st;
    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

    /**
     * Codec parameters - to be used by the decoding/streamcopy code.
     * st->codecpar should not be accessed, because it may be modified
     * concurrently by the demuxing thread.
     */
    AVCodecParameters *par;
    Decoder *decoder;
    const AVCodec *dec;

    AVRational framerate_guessed;

    AVDictionary *decoder_opts;
    AVRational framerate;               /* framerate forced with -r */
#if FFMPEG_OPT_TOP
    int top_field_first;
#endif

    int autorotate;

    int fix_sub_duration;

    struct sub2video {
        int w, h;
    } sub2video;

    /* decoded data from this stream goes into all those filters
     * currently video and audio only */
    InputFilter **filters;
    int        nb_filters;

    /*
     * Output targets that do not go through lavfi, i.e. subtitles or
     * streamcopy. Those two cases are distinguished by the OutputStream
     * having an encoder or not.
     */
    struct OutputStream **outputs;
    int                nb_outputs;

    int reinit_filters;
} InputStream;

typedef struct InputFile {
    const AVClass *class;

    int index;

    AVFormatContext *ctx;
    int64_t input_ts_offset;
    int input_sync_ref;
    /**
     * Effective format start time based on enabled streams.
     */
    int64_t start_time_effective;
    int64_t ts_offset;
    int64_t start_time;   /* user-specified start time in AV_TIME_BASE or AV_NOPTS_VALUE */
    int64_t recording_time;

    /* streams that ffmpeg is aware of;
     * there may be extra streams in ctx that are not mapped to an InputStream
     * if new streams appear dynamically during demuxing */
    InputStream **streams;
    int        nb_streams;

    int accurate_seek;
} 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)
#define ABORT_ON_FLAG_EMPTY_OUTPUT_STREAM (1 <<  1)

enum EncStatsType {
    ENC_STATS_LITERAL = 0,
    ENC_STATS_FILE_IDX,
    ENC_STATS_STREAM_IDX,
    ENC_STATS_FRAME_NUM,
    ENC_STATS_FRAME_NUM_IN,
    ENC_STATS_TIMEBASE,
    ENC_STATS_TIMEBASE_IN,
    ENC_STATS_PTS,
    ENC_STATS_PTS_TIME,
    ENC_STATS_PTS_IN,
    ENC_STATS_PTS_TIME_IN,
    ENC_STATS_DTS,
    ENC_STATS_DTS_TIME,
    ENC_STATS_SAMPLE_NUM,
    ENC_STATS_NB_SAMPLES,
    ENC_STATS_PKT_SIZE,
    ENC_STATS_BITRATE,
    ENC_STATS_AVG_BITRATE,
    ENC_STATS_KEYFRAME,
};

typedef struct EncStatsComponent {
    enum EncStatsType type;

    uint8_t *str;
    size_t   str_len;
} EncStatsComponent;

typedef struct EncStats {
    EncStatsComponent  *components;
    int              nb_components;

    AVIOContext        *io;

    pthread_mutex_t     lock;
    int                 lock_initialized;
} EncStats;

extern const char *const forced_keyframes_const_names[];

typedef enum {
    ENCODER_FINISHED = 1,
    MUXER_FINISHED = 2,
} OSTFinished ;

enum {
    KF_FORCE_SOURCE         = 1,
#if FFMPEG_OPT_FORCE_KF_SOURCE_NO_DROP
    KF_FORCE_SOURCE_NO_DROP = 2,
#endif
};

typedef struct KeyframeForceCtx {
    int          type;

    int64_t      ref_pts;

    // timestamps of the forced keyframes, in AV_TIME_BASE_Q
    int64_t     *pts;
    int       nb_pts;
    int          index;

    AVExpr      *pexpr;
    double       expr_const_values[FKF_NB];

    int          dropped_keyframe;
} KeyframeForceCtx;

typedef struct Encoder Encoder;

typedef struct OutputStream {
    const AVClass *class;

    enum AVMediaType type;

    /* parent muxer */
    struct OutputFile *file;

    int index;               /* stream index in the output file */

    /**
     * Codec parameters for packets submitted to the muxer (i.e. before
     * bitstream filtering, if any).
     */
    AVCodecParameters *par_in;

    /* input stream that is the source for this output stream;
     * may be NULL for streams with no well-defined source, e.g.
     * attachments or outputs from complex filtergraphs */
    InputStream *ist;

    AVStream *st;            /* stream in the output file */

    AVRational enc_timebase;

    Encoder *enc;
    AVCodecContext *enc_ctx;

    /* video only */
    AVRational frame_rate;
    AVRational max_frame_rate;
    enum VideoSyncMethod vsync_method;
    int is_cfr;
    int force_fps;
#if FFMPEG_OPT_TOP
    int top_field_first;
#endif
#if FFMPEG_ROTATION_METADATA
    int rotate_overridden;
#endif
    int autoscale;
    int bitexact;
    int bits_per_raw_sample;
#if FFMPEG_ROTATION_METADATA
    double rotate_override_value;
#endif

    AVRational frame_aspect_ratio;

    KeyframeForceCtx kf;

    /* audio only */
#if FFMPEG_OPT_MAP_CHANNEL
    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 */
#endif

    char *logfile_prefix;
    FILE *logfile;

    OutputFilter *filter;

    AVDictionary *encoder_opts;
    AVDictionary *sws_dict;
    AVDictionary *swr_opts;
    char *apad;

    const char *attachment_filename;

    int keep_pix_fmt;

    /* stats */
    // number of packets send to the muxer
    atomic_uint_least64_t packets_written;
    // number of frames/samples sent to the encoder
    uint64_t frames_encoded;
    uint64_t samples_encoded;

    /* packet quality factor */
    atomic_int quality;

    EncStats enc_stats_pre;
    EncStats enc_stats_post;

    /*
     * bool on whether this stream should be utilized for splitting
     * subtitles utilizing fix_sub_duration at random access points.
     */
    unsigned int fix_sub_duration_heartbeat;
} OutputStream;

typedef struct OutputFile {
    const AVClass *class;

    int index;

    const AVOutputFormat *format;
    const char           *url;

    OutputStream **streams;
    int         nb_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

    int shortest;
    int bitexact;
} OutputFile;

// optionally attached as opaque_ref to decoded AVFrames
typedef struct FrameData {
    // demuxer-estimated dts in AV_TIME_BASE_Q,
    // to be used when real dts is missing
    int64_t dts_est;

    // properties that come from the decoder
    struct {
        uint64_t   frame_num;

        int64_t    pts;
        AVRational tb;
    } dec;

    AVRational frame_rate_filter;

    int        bits_per_raw_sample;

    int64_t wallclock[LATENCY_PROBE_NB];
} FrameData;

extern InputFile   **input_files;
extern int        nb_input_files;

extern OutputFile   **output_files;
extern int         nb_output_files;

extern FilterGraph **filtergraphs;
extern int        nb_filtergraphs;

extern char *vstats_filename;

extern float dts_delta_threshold;
extern float dts_error_threshold;

extern enum VideoSyncMethod video_sync_method;
extern float frame_drop_threshold;
extern int do_benchmark;
extern int do_benchmark_all;
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 int64_t stats_period;
extern int stdin_interaction;
extern AVIOContext *progress_avio;
extern float max_error_rate;

extern char *filter_nbthreads;
extern int filter_complex_nbthreads;
extern int vstats_version;
extern int auto_conversion_filters;

extern const AVIOInterruptCB int_cb;

extern const OptionDef options[];
extern HWDevice *filter_hw_device;

extern atomic_uint nb_output_dumped;

extern int ignore_unknown_streams;
extern int copy_unknown_streams;

extern int recast_media;

extern FILE *vstats_file;

#if FFMPEG_OPT_PSNR
extern int do_psnr;
#endif

void term_init(void);
void term_exit(void);

void show_usage(void);

void remove_avoptions(AVDictionary **a, AVDictionary *b);
int check_avoptions(AVDictionary *m);

int assert_file_overwrite(const char *filename);
AVDictionary *strip_specifiers(const AVDictionary *dict);
int find_codec(void *logctx, const char *name,
               enum AVMediaType type, int encoder, const AVCodec **codec);
int parse_and_set_vsync(const char *arg, int *vsync_var, int file_idx, int st_idx, int is_global);

int check_filter_outputs(void);
int filtergraph_is_simple(const FilterGraph *fg);
int init_simple_filtergraph(InputStream *ist, OutputStream *ost,
                            char *graph_desc,
                            Scheduler *sch, unsigned sch_idx_enc);
int init_complex_filtergraph(FilterGraph *fg);

int copy_av_subtitle(AVSubtitle *dst, const AVSubtitle *src);
int subtitle_wrap_frame(AVFrame *frame, AVSubtitle *subtitle, int copy);

/**
 * Get our axiliary frame data attached to the frame, allocating it
 * if needed.
 */
FrameData *frame_data(AVFrame *frame);

const FrameData *frame_data_c(AVFrame *frame);

FrameData       *packet_data  (AVPacket *pkt);
const FrameData *packet_data_c(AVPacket *pkt);

/**
 * Set up fallback filtering parameters from a decoder context. They will only
 * be used if no frames are ever sent on this input, otherwise the actual
 * parameters are taken from the frame.
 */
int ifilter_parameters_from_dec(InputFilter *ifilter, const AVCodecContext *dec);

int ofilter_bind_ost(OutputFilter *ofilter, OutputStream *ost,
                     unsigned sched_idx_enc);

/**
 * Create a new filtergraph in the global filtergraph list.
 *
 * @param graph_desc Graph description; an av_malloc()ed string, filtergraph
 *                   takes ownership of it.
 */
int fg_create(FilterGraph **pfg, char *graph_desc, Scheduler *sch);

void fg_free(FilterGraph **pfg);

void fg_send_command(FilterGraph *fg, double time, const char *target,
                     const char *command, const char *arg, int all_filters);

int ffmpeg_parse_options(int argc, char **argv, Scheduler *sch);

void enc_stats_write(OutputStream *ost, EncStats *es,
                     const AVFrame *frame, const AVPacket *pkt,
                     uint64_t frame_num);

HWDevice *hw_device_get_by_name(const char *name);
HWDevice *hw_device_get_by_type(enum AVHWDeviceType type);
int hw_device_init_from_string(const char *arg, HWDevice **dev);
int hw_device_init_from_type(enum AVHWDeviceType type,
                             const char *device,
                             HWDevice **dev_out);
void hw_device_free_all(void);

/**
 * Get a hardware device to be used with this filtergraph.
 * The returned reference is owned by the callee, the caller
 * must ref it explicitly for long-term use.
 */
AVBufferRef *hw_device_for_filter(void);

/**
 * @param dec_opts Dictionary filled with decoder options. Its ownership
 *                 is transferred to the decoder.
 */
int dec_open(InputStream *ist, Scheduler *sch, unsigned sch_idx,
             AVDictionary **dec_opts, int flags, const DecoderOpts *o);
void dec_free(Decoder **pdec);

int dec_add_filter(Decoder *dec, InputFilter *ifilter);

int enc_alloc(Encoder **penc, const AVCodec *codec,
              Scheduler *sch, unsigned sch_idx);
void enc_free(Encoder **penc);

int enc_open(void *opaque, const AVFrame *frame);

/*
 * Initialize muxing state for the given stream, should be called
 * after the codec/streamcopy setup has been done.
 *
 * Open the muxer once all the streams have been initialized.
 */
int of_stream_init(OutputFile *of, OutputStream *ost);
int of_write_trailer(OutputFile *of);
int of_open(const OptionsContext *o, const char *filename, Scheduler *sch);
void of_free(OutputFile **pof);

void of_enc_stats_close(void);

int64_t of_filesize(OutputFile *of);

int ifile_open(const OptionsContext *o, const char *filename, Scheduler *sch);
void ifile_close(InputFile **f);

int ist_output_add(InputStream *ist, OutputStream *ost);
int ist_filter_add(InputStream *ist, InputFilter *ifilter, int is_simple);

/**
 * Find an unused input stream of given type.
 */
InputStream *ist_find_unused(enum AVMediaType type);

/* iterate over all input streams in all input files;
 * pass NULL to start iteration */
InputStream *ist_iter(InputStream *prev);

/* iterate over all output streams in all output files;
 * pass NULL to start iteration */
OutputStream *ost_iter(OutputStream *prev);

void update_benchmark(const char *fmt, ...);

#define SPECIFIER_OPT_FMT_str  "%s"
#define SPECIFIER_OPT_FMT_i    "%i"
#define SPECIFIER_OPT_FMT_i64  "%"PRId64
#define SPECIFIER_OPT_FMT_ui64 "%"PRIu64
#define SPECIFIER_OPT_FMT_f    "%f"
#define SPECIFIER_OPT_FMT_dbl  "%lf"

#define WARN_MULTIPLE_OPT_USAGE(optname, type, idx, st)\
{\
    char namestr[128] = "";\
    const SpecifierOpt *so = &o->optname.opt[idx];\
    const char *spec = so->specifier && so->specifier[0] ? so->specifier : "";\
    snprintf(namestr, sizeof(namestr), "-%s", o->optname.opt_canon->name);\
    if (o->optname.opt_canon->flags & OPT_HAS_ALT) {\
        const char * const *names_alt = o->optname.opt_canon->u1.names_alt;\
        for (int _i = 0; names_alt[_i]; _i++)\
            av_strlcatf(namestr, sizeof(namestr), "/-%s", names_alt[_i]);\
    }\
    av_log(NULL, AV_LOG_WARNING, "Multiple %s options specified for stream %d, only the last option '-%s%s%s "SPECIFIER_OPT_FMT_##type"' will be used.\n",\
           namestr, st->index, o->optname.opt_canon->name, spec[0] ? ":" : "", spec, so->u.type);\
}

#define MATCH_PER_STREAM_OPT(name, type, outvar, fmtctx, st)\
{\
    int _ret, _matches = 0, _match_idx;\
    for (int _i = 0; _i < o->name.nb_opt; _i++) {\
        char *spec = o->name.opt[_i].specifier;\
        if ((_ret = check_stream_specifier(fmtctx, st, spec)) > 0) {\
            outvar = o->name.opt[_i].u.type;\
            _match_idx = _i;\
            _matches++;\
        } else if (_ret < 0)\
            return _ret;\
    }\
    if (_matches > 1 && o->name.opt_canon)\
       WARN_MULTIPLE_OPT_USAGE(name, type, _match_idx, st);\
}

const char *opt_match_per_type_str(const SpecifierOptList *sol,
                                   char mediatype);

void *muxer_thread(void *arg);
void *decoder_thread(void *arg);
void *encoder_thread(void *arg);

#endif /* FFTOOLS_FFMPEG_H */