/* * 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 #include #include #include #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 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; } 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; 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 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 */ /* number of frames emitted by the video-encoding sync code */ int64_t vsync_frame_number; /* predicted pts of the next frame to be encoded * audio/video encoding only */ int64_t next_pts; /* dts of the last packet sent to the muxing queue, in AV_TIME_BASE_Q */ int64_t last_mux_dts; /* pts of the last frame received from the filters, in AV_TIME_BASE_Q */ int64_t last_filter_pts; // 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; AVCodecContext *enc_ctx; AVFrame *filtered_frame; AVFrame *last_frame; AVFrame *sq_frame; AVPacket *pkt; int64_t last_dropped; int64_t last_nb0_frames[3]; /* 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 sent to the muxer uint64_t data_size_mux; // 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; 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 qp_hist; 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 main_return_code; extern int ignore_unknown_streams; extern int copy_unknown_streams; extern int recast_media; #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 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); /* * 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); /* iterate over all input streams in all input files; * pass NULL to start iteration */ InputStream *ist_iter(InputStream *prev); #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 */