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 "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

enum VideoSyncMethod {
    VSYNC_AUTO = -1,
    VSYNC_PASSTHROUGH,
    VSYNC_CFR,
    VSYNC_VFR,
    VSYNC_VSCFR,
    VSYNC_DROP,
};

#define MAX_STREAMS 1024    /* arbitrary sanity check value */

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

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;

    SpecifierOpt *codec_names;
    int        nb_codec_names;
    SpecifierOpt *audio_ch_layouts;
    int        nb_audio_ch_layouts;
    SpecifierOpt *audio_channels;
    int        nb_audio_channels;
    SpecifierOpt *audio_sample_rate;
    int        nb_audio_sample_rate;
    SpecifierOpt *frame_rates;
    int        nb_frame_rates;
    SpecifierOpt *max_frame_rates;
    int        nb_max_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;
    float readrate;
    int accurate_seek;
    int thread_queue_size;
    int input_sync_ref;
    int find_stream_info;

    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;
#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;

    /* 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 *fps_mode;
    int        nb_fps_mode;
    SpecifierOpt *force_fps;
    int        nb_force_fps;
    SpecifierOpt *frame_aspect_ratios;
    int        nb_frame_aspect_ratios;
    SpecifierOpt *display_rotations;
    int        nb_display_rotations;
    SpecifierOpt *display_hflips;
    int        nb_display_hflips;
    SpecifierOpt *display_vflips;
    int        nb_display_vflips;
    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 *fix_sub_duration_heartbeat;
    int        nb_fix_sub_duration_heartbeat;
    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 *muxing_queue_data_threshold;
    int        nb_muxing_queue_data_threshold;
    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;
    SpecifierOpt *autoscale;
    int        nb_autoscale;
    SpecifierOpt *bits_per_raw_sample;
    int        nb_bits_per_raw_sample;
    SpecifierOpt *enc_stats_pre;
    int        nb_enc_stats_pre;
    SpecifierOpt *enc_stats_post;
    int        nb_enc_stats_post;
    SpecifierOpt *mux_stats;
    int        nb_mux_stats;
    SpecifierOpt *enc_stats_pre_fmt;
    int        nb_enc_stats_pre_fmt;
    SpecifierOpt *enc_stats_post_fmt;
    int        nb_enc_stats_post_fmt;
    SpecifierOpt *mux_stats_fmt;
    int        nb_mux_stats_fmt;
} OptionsContext;

typedef struct InputFilter {
    AVFilterContext    *filter;
    struct InputStream *ist;
    struct FilterGraph *graph;
    uint8_t            *name;
    enum AVMediaType    type;   // AVMEDIA_TYPE_SUBTITLE for sub2video

    AVFifo *frame_queue;

    // parameters configured for this input
    int format;

    int width, height;
    AVRational sample_aspect_ratio;

    int sample_rate;
    AVChannelLayout ch_layout;

    AVBufferRef *hw_frames_ctx;
    int32_t *displaymatrix;

    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;
    AVChannelLayout ch_layout;

    // those are only set if no format is specified and the encoder gives us multiple options
    // They point directly to the relevant lists of the encoder.
    const int *formats;
    const AVChannelLayout *ch_layouts;
    const int *sample_rates;

    /* pts of the last frame received from this filter, in AV_TIME_BASE_Q */
    int64_t last_pts;
} OutputFilter;

typedef struct FilterGraph {
    int            index;
    const char    *graph_desc;

    AVFilterGraph *graph;
    int reconfiguration;
    // true when the filtergraph contains only meta filters
    // that do not modify the frame data
    int is_meta;

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

typedef struct InputStream {
    const AVClass *class;

    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
    // should attach FrameData as opaque_ref after decoding
    int want_frame_data;

    /**
     * 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;
    AVCodecContext *dec_ctx;
    const AVCodec *dec;
    AVFrame *decoded_frame;
    AVPacket *pkt;

    AVRational framerate_guessed;

    int64_t       prev_pkt_pts;
    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 first_dts;       ///< dts of the first packet read for this stream (in AV_TIME_BASE units)
    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;

    // the value of AVCodecParserContext.repeat_pict from the AVStream parser
    // for the last packet returned from ifile_get_packet()
    // -1 if unknown
    // FIXME: this is a hack, the avstream parser should not be used
    int last_pkt_repeat_pict;

    int64_t filter_in_rescale_delta_last;

    // 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 */

    int saw_first_ts;
    AVDictionary *decoder_opts;
    AVRational framerate;               /* framerate forced with -r */
    int top_field_first;

    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;
        AVFifo *sub_queue;    ///< queue of AVSubtitle* before filter init
        AVFrame *frame;
        int w, h;
        unsigned int initialize; ///< marks if sub2video_update should force an initialization
    } 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;

    /* hwaccel options */
    enum HWAccelID hwaccel_id;
    enum AVHWDeviceType hwaccel_device_type;
    char  *hwaccel_device;
    enum AVPixelFormat hwaccel_output_format;

    int  (*hwaccel_retrieve_data)(AVCodecContext *s, AVFrame *frame);
    enum AVPixelFormat hwaccel_pix_fmt;

    /* 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 LastFrameDuration {
    int     stream_idx;
    int64_t duration;
} LastFrameDuration;

typedef struct InputFile {
    const AVClass *class;

    int index;

    AVFormatContext *ctx;
    int eof_reached;      /* true if eof reached */
    int eagain;           /* true if last read attempt returned EAGAIN */
    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;
    /**
     * Extra timestamp offset added by discontinuity handling.
     */
    int64_t ts_offset_discont;
    int64_t last_ts;
    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 rate_emu;
    float readrate;
    int accurate_seek;

    /* when looping the input file, this queue is used by decoders to report
     * the last frame duration back to the demuxer thread */
    AVThreadMessageQueue *audio_duration_queue;
    int                   audio_duration_queue_size;
} 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,
};

typedef struct EncStatsComponent {
    enum EncStatsType type;

    uint8_t *str;
    size_t   str_len;
} EncStatsComponent;

typedef struct EncStats {
    EncStatsComponent  *components;
    int              nb_components;

    AVIOContext        *io;
} EncStats;

extern const char *const forced_keyframes_const_names[];

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

enum {
    KF_FORCE_SOURCE         = 1,
    KF_FORCE_SOURCE_NO_DROP = 2,
};

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;

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

    /* 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 */
    /* dts of the last packet sent to the muxing queue, in AV_TIME_BASE_Q */
    int64_t last_mux_dts;

    // timestamp from which the streamcopied streams should start,
    // in AV_TIME_BASE_Q;
    // everything before it should be discarded
    int64_t ts_copy_start;

    // the timebase of the packets sent to the muxer
    AVRational mux_timebase;
    AVRational enc_timebase;

    Encoder *enc;
    AVCodecContext *enc_ctx;
    AVFrame *filtered_frame;
    AVPacket *pkt;
    int64_t last_dropped;

    /* video only */
    AVRational frame_rate;
    AVRational max_frame_rate;
    enum VideoSyncMethod vsync_method;
    int is_cfr;
    int force_fps;
    int top_field_first;
#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;
    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;
    char *apad;
    OSTFinished finished;        /* no more packets should be written for this stream */
    int unavailable;                     /* true if the steram is unavailable (possibly temporarily) */

    // 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 streamcopy_started;
    int copy_initial_nonkeyframes;
    int copy_prior_start;

    int keep_pix_fmt;

    /* stats */
    // combined size of all the packets received from the encoder
    uint64_t data_size_enc;
    // 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;
    // number of packets received from the encoder
    uint64_t packets_encoded;

    /* packet quality factor */
    int quality;

    /* packet picture type */
    int pict_type;

    /* frame encode sum of squared error values */
    int64_t error[4];

    int sq_idx_encode;
    int sq_idx_mux;

    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;

    SyncQueue *sq_encode;

    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 {
    uint64_t   idx;
    int64_t    pts;
    AVRational tb;
} 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 char *sdp_filename;

extern float audio_drift_threshold;
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 unsigned nb_output_dumped;

extern int ignore_unknown_streams;
extern int copy_unknown_streams;

extern int recast_media;

extern FILE *vstats_file;

extern int64_t nb_frames_dup;
extern int64_t nb_frames_drop;

#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);
void assert_avoptions(AVDictionary *m);

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

int configure_filtergraph(FilterGraph *fg);
void check_filter_outputs(void);
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, int64_t heartbeat_pts, AVSubtitle *sub);

int ifilter_parameters_from_frame(InputFilter *ifilter, const AVFrame *frame);
int ifilter_parameters_from_codecpar(InputFilter *ifilter, AVCodecParameters *par);
int ifilter_has_all_input_formats(FilterGraph *fg);

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

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);
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);
/**
 * 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);

int hwaccel_decode_init(AVCodecContext *avctx);

int enc_alloc(Encoder **penc, const AVCodec *codec);
void enc_free(Encoder **penc);

int enc_open(OutputStream *ost, AVFrame *frame);
void enc_subtitle(OutputFile *of, OutputStream *ost, AVSubtitle *sub);
void enc_frame(OutputStream *ost, AVFrame *frame);
void enc_flush(void);

/*
 * 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);
void of_close(OutputFile **pof);

void of_enc_stats_close(void);

/*
 * Send a single packet to the output, applying any bitstream filters
 * associated with the output stream.  This may result in any number
 * of packets actually being written, depending on what bitstream
 * filters are applied.  The supplied packet is consumed and will be
 * blank (as if newly-allocated) when this function returns.
 *
 * If eof is set, instead indicate EOF to all bitstream filters and
 * therefore flush any delayed packets to the output.  A blank packet
 * must be supplied in this case.
 */
void of_output_packet(OutputFile *of, AVPacket *pkt, OutputStream *ost, int eof);
int64_t of_filesize(OutputFile *of);

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

/**
 * Get next input packet from the demuxer.
 *
 * @param pkt the packet is written here when this function returns 0
 * @return
 * - 0 when a packet has been read successfully
 * - 1 when stream end was reached, but the stream is looped;
 *     caller should flush decoders and read from this demuxer again
 * - a negative error code on failure
 */
int ifile_get_packet(InputFile *f, AVPacket **pkt);

void ist_output_add(InputStream *ist, OutputStream *ost);

/* 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);

static inline double psnr(double d)
{
    return -10.0 * log10(d);
}

void close_output_stream(OutputStream *ost);
int trigger_fix_sub_duration_heartbeat(OutputStream *ost, const AVPacket *pkt);
void update_benchmark(const char *fmt, ...);

/**
 * Merge two return codes - return one of the error codes if at least one of
 * them was negative, 0 otherwise.
 * Currently just picks the first one, eventually we might want to do something
 * more sophisticated, like sorting them by priority.
 */
static inline int err_merge(int err0, int err1)
{
    return (err0 < 0) ? err0 : FFMIN(err1, 0);
}

#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(name, type, so, st)\
{\
    char namestr[128] = "";\
    const char *spec = so->specifier && so->specifier[0] ? so->specifier : "";\
    for (int _i = 0; opt_name_##name[_i]; _i++)\
        av_strlcatf(namestr, sizeof(namestr), "-%s%s", opt_name_##name[_i], opt_name_##name[_i+1] ? (opt_name_##name[_i+2] ? ", " : " or ") : "");\
    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, opt_name_##name[0], spec[0] ? ":" : "", spec, so->u.type);\
}

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

#define MATCH_PER_TYPE_OPT(name, type, outvar, fmtctx, mediatype)\
{\
    int i;\
    for (i = 0; i < o->nb_ ## name; i++) {\
        char *spec = o->name[i].specifier;\
        if (!strcmp(spec, mediatype))\
            outvar = o->name[i].u.type;\
    }\
}

extern const char * const opt_name_codec_names[];
extern const char * const opt_name_codec_tags[];
extern const char * const opt_name_frame_rates[];
extern const char * const opt_name_top_field_first[];

#endif /* FFTOOLS_FFMPEG_H */