av_register_all()

av_register_all()的作用是:初始化所有组件,只有调用了该函数,才能使用复用器和编解码器,该接口内部的调用为:

(1).avcodec_register_all(),该接口内部执行步骤:

 - 注册硬件加速器:REGISTER_HWACCEL()

 - 注册音视频编码器:REGISTER_ENCODER()

 - 注册音视频解码器:REGISTER_DECODER()

 - 打包注册:REGISTER_ENCDEC()

 - 注册解析器:REGISTER_PARSER()

(2).执行复用器和解复用器的注册:

 - 注册复用器:REGISTER_MUXER()

 - 注册解复用器:REGISTER_DEMUXER()

 - 打包注册:REGISTER_MUXDEMUX()


代码如下:

void av_register_all(void)
{
    static int initialized;

    if (initialized)
        return;

    avcodec_register_all();

    /* (de)muxers */
    REGISTER_MUXER   (A64,              a64);
    REGISTER_DEMUXER (AA,               aa);
    REGISTER_DEMUXER (AAC,              aac);
    REGISTER_MUXDEMUX(AC3,              ac3);
    REGISTER_DEMUXER (ACM,              acm);
    REGISTER_DEMUXER (ACT,              act);
    REGISTER_DEMUXER (ADF,              adf);
    REGISTER_DEMUXER (ADP,              adp);
    REGISTER_DEMUXER (ADS,              ads);
    REGISTER_MUXER   (ADTS,             adts);
    REGISTER_MUXDEMUX(ADX,              adx);
    REGISTER_DEMUXER (AEA,              aea);
    REGISTER_DEMUXER (AFC,              afc);
    REGISTER_MUXDEMUX(AIFF,             aiff);
    REGISTER_DEMUXER (AIX,              aix);
    REGISTER_MUXDEMUX(AMR,              amr);
    REGISTER_DEMUXER (ANM,              anm);
    REGISTER_DEMUXER (APC,              apc);
    REGISTER_DEMUXER (APE,              ape);
    REGISTER_MUXDEMUX(APNG,             apng);
    REGISTER_DEMUXER (AQTITLE,          aqtitle);
    REGISTER_MUXDEMUX(ASF,              asf);
    REGISTER_DEMUXER (ASF_O,            asf_o);
    REGISTER_MUXDEMUX(ASS,              ass);
    REGISTER_MUXDEMUX(AST,              ast);
    REGISTER_MUXER   (ASF_STREAM,       asf_stream);
    REGISTER_MUXDEMUX(AU,               au);
    REGISTER_MUXDEMUX(AVI,              avi);
    REGISTER_DEMUXER (AVISYNTH,         avisynth);
    REGISTER_MUXER   (AVM2,             avm2);
    REGISTER_DEMUXER (AVR,              avr);
    REGISTER_DEMUXER (AVS,              avs);
    REGISTER_DEMUXER (BETHSOFTVID,      bethsoftvid);
    REGISTER_DEMUXER (BFI,              bfi);
    REGISTER_DEMUXER (BINTEXT,          bintext);
    REGISTER_DEMUXER (BINK,             bink);
    REGISTER_MUXDEMUX(BIT,              bit);
    REGISTER_DEMUXER (BMV,              bmv);
    REGISTER_DEMUXER (BFSTM,            bfstm);
    REGISTER_DEMUXER (BRSTM,            brstm);
    REGISTER_DEMUXER (BOA,              boa);
    REGISTER_DEMUXER (C93,              c93);
    REGISTER_MUXDEMUX(CAF,              caf);
    REGISTER_MUXDEMUX(CAVSVIDEO,        cavsvideo);
    REGISTER_DEMUXER (CDG,              cdg);
    REGISTER_DEMUXER (CDXL,             cdxl);
    REGISTER_DEMUXER (CINE,             cine);
    REGISTER_DEMUXER (CONCAT,           concat);
    REGISTER_MUXER   (CRC,              crc);
    REGISTER_MUXER   (DASH,             dash);
    REGISTER_MUXDEMUX(DATA,             data);
    REGISTER_MUXDEMUX(DAUD,             daud);
    REGISTER_DEMUXER (DCSTR,            dcstr);
    REGISTER_DEMUXER (DFA,              dfa);
    REGISTER_MUXDEMUX(DIRAC,            dirac);
    REGISTER_MUXDEMUX(DNXHD,            dnxhd);
    REGISTER_DEMUXER (DSF,              dsf);
    REGISTER_DEMUXER (DSICIN,           dsicin);
    REGISTER_DEMUXER (DSS,              dss);
    REGISTER_MUXDEMUX(DTS,              dts);
    REGISTER_DEMUXER (DTSHD,            dtshd);
    REGISTER_MUXDEMUX(DV,               dv);
    REGISTER_DEMUXER (DVBSUB,           dvbsub);
    REGISTER_DEMUXER (DVBTXT,           dvbtxt);
    REGISTER_DEMUXER (DXA,              dxa);
    REGISTER_DEMUXER (EA,               ea);
    REGISTER_DEMUXER (EA_CDATA,         ea_cdata);
    REGISTER_MUXDEMUX(EAC3,             eac3);
    REGISTER_DEMUXER (EPAF,             epaf);
    REGISTER_MUXER   (F4V,              f4v);
    REGISTER_MUXDEMUX(FFM,              ffm);
    REGISTER_MUXDEMUX(FFMETADATA,       ffmetadata);
    REGISTER_MUXER   (FIFO,             fifo);
    REGISTER_MUXDEMUX(FILMSTRIP,        filmstrip);
    REGISTER_MUXDEMUX(FLAC,             flac);
    REGISTER_DEMUXER (FLIC,             flic);
    REGISTER_MUXDEMUX(FLV,              flv);
    REGISTER_DEMUXER (LIVE_FLV,         live_flv);
    REGISTER_DEMUXER (FOURXM,           fourxm);
    REGISTER_MUXER   (FRAMECRC,         framecrc);
    REGISTER_MUXER   (FRAMEHASH,        framehash);
    REGISTER_MUXER   (FRAMEMD5,         framemd5);
    REGISTER_DEMUXER (FRM,              frm);
    REGISTER_DEMUXER (FSB,              fsb);
    REGISTER_MUXDEMUX(G722,             g722);
    REGISTER_MUXDEMUX(G723_1,           g723_1);
    REGISTER_DEMUXER (G729,             g729);
    REGISTER_DEMUXER (GENH,             genh);
    REGISTER_MUXDEMUX(GIF,              gif);
    REGISTER_MUXDEMUX(GSM,              gsm);
    REGISTER_MUXDEMUX(GXF,              gxf);
    REGISTER_MUXDEMUX(H261,             h261);
    REGISTER_MUXDEMUX(H263,             h263);
    REGISTER_MUXDEMUX(H264,             h264);
    REGISTER_MUXER   (HASH,             hash);
    REGISTER_MUXER   (HDS,              hds);
    REGISTER_MUXDEMUX(HEVC,             hevc);
    REGISTER_MUXDEMUX(HLS,              hls);
    REGISTER_DEMUXER (HNM,              hnm);
    REGISTER_MUXDEMUX(ICO,              ico);
    REGISTER_DEMUXER (IDCIN,            idcin);
    REGISTER_DEMUXER (IDF,              idf);
    REGISTER_DEMUXER (IFF,              iff);
    REGISTER_MUXDEMUX(ILBC,             ilbc);
    REGISTER_MUXDEMUX(IMAGE2,           image2);
    REGISTER_MUXDEMUX(IMAGE2PIPE,       image2pipe);
    REGISTER_DEMUXER (IMAGE2_ALIAS_PIX, image2_alias_pix);
    REGISTER_DEMUXER (IMAGE2_BRENDER_PIX, image2_brender_pix);
    REGISTER_DEMUXER (INGENIENT,        ingenient);
    REGISTER_DEMUXER (IPMOVIE,          ipmovie);
    REGISTER_MUXER   (IPOD,             ipod);
    REGISTER_MUXDEMUX(IRCAM,            ircam);
    REGISTER_MUXER   (ISMV,             ismv);
    REGISTER_DEMUXER (ISS,              iss);
    REGISTER_DEMUXER (IV8,              iv8);
    REGISTER_MUXDEMUX(IVF,              ivf);
    REGISTER_DEMUXER (IVR,              ivr);
    REGISTER_MUXDEMUX(JACOSUB,          jacosub);
    REGISTER_DEMUXER (JV,               jv);
    REGISTER_MUXER   (LATM,             latm);
    REGISTER_DEMUXER (LMLM4,            lmlm4);
    REGISTER_DEMUXER (LOAS,             loas);
    REGISTER_MUXDEMUX(LRC,              lrc);
    REGISTER_DEMUXER (LVF,              lvf);
    REGISTER_DEMUXER (LXF,              lxf);
    REGISTER_MUXDEMUX(M4V,              m4v);
    REGISTER_MUXER   (MD5,              md5);
    REGISTER_MUXDEMUX(MATROSKA,         matroska);
    REGISTER_MUXER   (MATROSKA_AUDIO,   matroska_audio);
    REGISTER_DEMUXER (MGSTS,            mgsts);
    REGISTER_MUXDEMUX(MICRODVD,         microdvd);
    REGISTER_MUXDEMUX(MJPEG,            mjpeg);
    REGISTER_MUXDEMUX(MLP,              mlp);
    REGISTER_DEMUXER (MLV,              mlv);
    REGISTER_DEMUXER (MM,               mm);
    REGISTER_MUXDEMUX(MMF,              mmf);
    REGISTER_MUXDEMUX(MOV,              mov);
    REGISTER_MUXER   (MP2,              mp2);
    REGISTER_MUXDEMUX(MP3,              mp3);
    REGISTER_MUXER   (MP4,              mp4);
    REGISTER_DEMUXER (MPC,              mpc);
    REGISTER_DEMUXER (MPC8,             mpc8);
    REGISTER_MUXER   (MPEG1SYSTEM,      mpeg1system);
    REGISTER_MUXER   (MPEG1VCD,         mpeg1vcd);
    REGISTER_MUXER   (MPEG1VIDEO,       mpeg1video);
    REGISTER_MUXER   (MPEG2DVD,         mpeg2dvd);
    REGISTER_MUXER   (MPEG2SVCD,        mpeg2svcd);
    REGISTER_MUXER   (MPEG2VIDEO,       mpeg2video);
    REGISTER_MUXER   (MPEG2VOB,         mpeg2vob);
    REGISTER_DEMUXER (MPEGPS,           mpegps);
    REGISTER_MUXDEMUX(MPEGTS,           mpegts);
    REGISTER_DEMUXER (MPEGTSRAW,        mpegtsraw);
    REGISTER_DEMUXER (MPEGVIDEO,        mpegvideo);
    REGISTER_MUXDEMUX(MPJPEG,           mpjpeg);
    REGISTER_DEMUXER (MPL2,             mpl2);
    REGISTER_DEMUXER (MPSUB,            mpsub);
    REGISTER_DEMUXER (MSF,              msf);
    REGISTER_DEMUXER (MSNWC_TCP,        msnwc_tcp);
    REGISTER_DEMUXER (MTAF,             mtaf);
    REGISTER_DEMUXER (MTV,              mtv);
    REGISTER_DEMUXER (MUSX,             musx);
    REGISTER_DEMUXER (MV,               mv);
    REGISTER_DEMUXER (MVI,              mvi);
    REGISTER_MUXDEMUX(MXF,              mxf);
    REGISTER_MUXER   (MXF_D10,          mxf_d10);
    REGISTER_MUXER   (MXF_OPATOM,       mxf_opatom);
    REGISTER_DEMUXER (MXG,              mxg);
    REGISTER_DEMUXER (NC,               nc);
    REGISTER_DEMUXER (NISTSPHERE,       nistsphere);
    REGISTER_DEMUXER (NSV,              nsv);
    REGISTER_MUXER   (NULL,             null);
    REGISTER_MUXDEMUX(NUT,              nut);
    REGISTER_DEMUXER (NUV,              nuv);
    REGISTER_MUXER   (OGA,              oga);
    REGISTER_MUXDEMUX(OGG,              ogg);
    REGISTER_MUXER   (OGV,              ogv);
    REGISTER_MUXDEMUX(OMA,              oma);
    REGISTER_MUXER   (OPUS,             opus);
    REGISTER_DEMUXER (PAF,              paf);
    REGISTER_MUXDEMUX(PCM_ALAW,         pcm_alaw);
    REGISTER_MUXDEMUX(PCM_MULAW,        pcm_mulaw);
    REGISTER_MUXDEMUX(PCM_F64BE,        pcm_f64be);
    REGISTER_MUXDEMUX(PCM_F64LE,        pcm_f64le);
    REGISTER_MUXDEMUX(PCM_F32BE,        pcm_f32be);
    REGISTER_MUXDEMUX(PCM_F32LE,        pcm_f32le);
    REGISTER_MUXDEMUX(PCM_S32BE,        pcm_s32be);
    REGISTER_MUXDEMUX(PCM_S32LE,        pcm_s32le);
    REGISTER_MUXDEMUX(PCM_S24BE,        pcm_s24be);
    REGISTER_MUXDEMUX(PCM_S24LE,        pcm_s24le);
    REGISTER_MUXDEMUX(PCM_S16BE,        pcm_s16be);
    REGISTER_MUXDEMUX(PCM_S16LE,        pcm_s16le);
    REGISTER_MUXDEMUX(PCM_S8,           pcm_s8);
    REGISTER_MUXDEMUX(PCM_U32BE,        pcm_u32be);
    REGISTER_MUXDEMUX(PCM_U32LE,        pcm_u32le);
    REGISTER_MUXDEMUX(PCM_U24BE,        pcm_u24be);
    REGISTER_MUXDEMUX(PCM_U24LE,        pcm_u24le);
    REGISTER_MUXDEMUX(PCM_U16BE,        pcm_u16be);
    REGISTER_MUXDEMUX(PCM_U16LE,        pcm_u16le);
    REGISTER_MUXDEMUX(PCM_U8,           pcm_u8);
    REGISTER_DEMUXER (PJS,              pjs);
    REGISTER_DEMUXER (PMP,              pmp);
    REGISTER_MUXER   (PSP,              psp);
    REGISTER_DEMUXER (PVA,              pva);
    REGISTER_DEMUXER (PVF,              pvf);
    REGISTER_DEMUXER (QCP,              qcp);
    REGISTER_DEMUXER (R3D,              r3d);
    REGISTER_MUXDEMUX(RAWVIDEO,         rawvideo);
    REGISTER_DEMUXER (REALTEXT,         realtext);
    REGISTER_DEMUXER (REDSPARK,         redspark);
    REGISTER_DEMUXER (RL2,              rl2);
    REGISTER_MUXDEMUX(RM,               rm);
    REGISTER_MUXDEMUX(ROQ,              roq);
    REGISTER_DEMUXER (RPL,              rpl);
    REGISTER_DEMUXER (RSD,              rsd);
    REGISTER_MUXDEMUX(RSO,              rso);
    REGISTER_MUXDEMUX(RTP,              rtp);
    REGISTER_MUXER   (RTP_MPEGTS,       rtp_mpegts);
    REGISTER_MUXDEMUX(RTSP,             rtsp);
    REGISTER_DEMUXER (SAMI,             sami);
    REGISTER_MUXDEMUX(SAP,              sap);
    REGISTER_DEMUXER (SBG,              sbg);
    REGISTER_DEMUXER (SDP,              sdp);
    REGISTER_DEMUXER (SDR2,             sdr2);
#if CONFIG_RTPDEC
    ff_register_rtp_dynamic_payload_handlers();
    ff_register_rdt_dynamic_payload_handlers();
#endif
    REGISTER_DEMUXER (SEGAFILM,         segafilm);
    REGISTER_MUXER   (SEGMENT,          segment);
    REGISTER_MUXER   (SEGMENT,          stream_segment);
    REGISTER_DEMUXER (SHORTEN,          shorten);
    REGISTER_DEMUXER (SIFF,             siff);
    REGISTER_MUXER   (SINGLEJPEG,       singlejpeg);
    REGISTER_DEMUXER (SLN,              sln);
    REGISTER_DEMUXER (SMACKER,          smacker);
    REGISTER_MUXDEMUX(SMJPEG,           smjpeg);
    REGISTER_MUXER   (SMOOTHSTREAMING,  smoothstreaming);
    REGISTER_DEMUXER (SMUSH,            smush);
    REGISTER_DEMUXER (SOL,              sol);
    REGISTER_MUXDEMUX(SOX,              sox);
    REGISTER_MUXER   (SPX,              spx);
    REGISTER_MUXDEMUX(SPDIF,            spdif);
    REGISTER_MUXDEMUX(SRT,              srt);
    REGISTER_DEMUXER (STR,              str);
    REGISTER_DEMUXER (STL,              stl);
    REGISTER_DEMUXER (SUBVIEWER1,       subviewer1);
    REGISTER_DEMUXER (SUBVIEWER,        subviewer);
    REGISTER_DEMUXER (SUP,              sup);
    REGISTER_DEMUXER (SVAG,             svag);
    REGISTER_MUXDEMUX(SWF,              swf);
    REGISTER_DEMUXER (TAK,              tak);
    REGISTER_MUXER   (TEE,              tee);
    REGISTER_DEMUXER (TEDCAPTIONS,      tedcaptions);
    REGISTER_MUXER   (TG2,              tg2);
    REGISTER_MUXER   (TGP,              tgp);
    REGISTER_DEMUXER (THP,              thp);
    REGISTER_DEMUXER (THREEDOSTR,       threedostr);
    REGISTER_DEMUXER (TIERTEXSEQ,       tiertexseq);
    REGISTER_MUXER   (MKVTIMESTAMP_V2,  mkvtimestamp_v2);
    REGISTER_DEMUXER (TMV,              tmv);
    REGISTER_MUXDEMUX(TRUEHD,           truehd);
    REGISTER_MUXDEMUX(TTA,              tta);
    REGISTER_DEMUXER (TXD,              txd);
    REGISTER_DEMUXER (TTY,              tty);
    REGISTER_MUXER   (UNCODEDFRAMECRC,  uncodedframecrc);
    REGISTER_DEMUXER (V210,             v210);
    REGISTER_DEMUXER (V210X,            v210x);
    REGISTER_DEMUXER (VAG,              vag);
    REGISTER_MUXDEMUX(VC1,              vc1);
    REGISTER_MUXDEMUX(VC1T,             vc1t);
    REGISTER_DEMUXER (VIVO,             vivo);
    REGISTER_DEMUXER (VMD,              vmd);
    REGISTER_DEMUXER (VOBSUB,           vobsub);
    REGISTER_MUXDEMUX(VOC,              voc);
    REGISTER_DEMUXER (VPK,              vpk);
    REGISTER_DEMUXER (VPLAYER,          vplayer);
    REGISTER_DEMUXER (VQF,              vqf);
    REGISTER_MUXDEMUX(W64,              w64);
    REGISTER_MUXDEMUX(WAV,              wav);
    REGISTER_DEMUXER (WC3,              wc3);
    REGISTER_MUXER   (WEBM,             webm);
    REGISTER_MUXDEMUX(WEBM_DASH_MANIFEST, webm_dash_manifest);
    REGISTER_MUXER   (WEBM_CHUNK,       webm_chunk);
    REGISTER_MUXER   (WEBP,             webp);
    REGISTER_MUXDEMUX(WEBVTT,           webvtt);
    REGISTER_DEMUXER (WSAUD,            wsaud);
    REGISTER_DEMUXER (WSD,              wsd);
    REGISTER_DEMUXER (WSVQA,            wsvqa);
    REGISTER_MUXDEMUX(WTV,              wtv);
    REGISTER_DEMUXER (WVE,              wve);
    REGISTER_MUXDEMUX(WV,               wv);
    REGISTER_DEMUXER (XA,               xa);
    REGISTER_DEMUXER (XBIN,             xbin);
    REGISTER_DEMUXER (XMV,              xmv);
    REGISTER_DEMUXER (XVAG,             xvag);
    REGISTER_DEMUXER (XWMA,             xwma);
    REGISTER_DEMUXER (YOP,              yop);
    REGISTER_MUXDEMUX(YUV4MPEGPIPE,     yuv4mpegpipe);

    /* image demuxers */
    REGISTER_DEMUXER (IMAGE_BMP_PIPE,        image_bmp_pipe);
    REGISTER_DEMUXER (IMAGE_DDS_PIPE,        image_dds_pipe);
    REGISTER_DEMUXER (IMAGE_DPX_PIPE,        image_dpx_pipe);
    REGISTER_DEMUXER (IMAGE_EXR_PIPE,        image_exr_pipe);
    REGISTER_DEMUXER (IMAGE_J2K_PIPE,        image_j2k_pipe);
    REGISTER_DEMUXER (IMAGE_JPEG_PIPE,       image_jpeg_pipe);
    REGISTER_DEMUXER (IMAGE_JPEGLS_PIPE,     image_jpegls_pipe);
    REGISTER_DEMUXER (IMAGE_PAM_PIPE,        image_pam_pipe);
    REGISTER_DEMUXER (IMAGE_PBM_PIPE,        image_pbm_pipe);
    REGISTER_DEMUXER (IMAGE_PCX_PIPE,        image_pcx_pipe);
    REGISTER_DEMUXER (IMAGE_PGMYUV_PIPE,     image_pgmyuv_pipe);
    REGISTER_DEMUXER (IMAGE_PGM_PIPE,        image_pgm_pipe);
    REGISTER_DEMUXER (IMAGE_PICTOR_PIPE,     image_pictor_pipe);
    REGISTER_DEMUXER (IMAGE_PNG_PIPE,        image_png_pipe);
    REGISTER_DEMUXER (IMAGE_PPM_PIPE,        image_ppm_pipe);
    REGISTER_DEMUXER (IMAGE_QDRAW_PIPE,      image_qdraw_pipe);
    REGISTER_DEMUXER (IMAGE_SGI_PIPE,        image_sgi_pipe);
    REGISTER_DEMUXER (IMAGE_SUNRAST_PIPE,    image_sunrast_pipe);
    REGISTER_DEMUXER (IMAGE_TIFF_PIPE,       image_tiff_pipe);
    REGISTER_DEMUXER (IMAGE_WEBP_PIPE,       image_webp_pipe);

    /* external libraries */
    REGISTER_MUXER   (CHROMAPRINT,      chromaprint);
    REGISTER_DEMUXER (LIBGME,           libgme);
    REGISTER_DEMUXER (LIBMODPLUG,       libmodplug);
    REGISTER_MUXDEMUX(LIBNUT,           libnut);
    REGISTER_DEMUXER (LIBOPENMPT,       libopenmpt);

    initialized = 1;
}


另外,avcodec_register_all()的代码如下:

void avcodec_register_all(void)
{
    static int initialized;

    if (initialized)
        return;
    initialized = 1;

    /* hardware accelerators */
    REGISTER_HWACCEL(H263_CUVID,        h263_cuvid);
    REGISTER_HWACCEL(H263_VAAPI,        h263_vaapi);
    REGISTER_HWACCEL(H263_VIDEOTOOLBOX, h263_videotoolbox);
    REGISTER_HWACCEL(H264_CUVID,        h264_cuvid);
    REGISTER_HWACCEL(H264_D3D11VA,      h264_d3d11va);
    REGISTER_HWACCEL(H264_DXVA2,        h264_dxva2);
    REGISTER_HWACCEL(H264_MEDIACODEC,   h264_mediacodec);
    REGISTER_HWACCEL(H264_MMAL,         h264_mmal);
    REGISTER_HWACCEL(H264_QSV,          h264_qsv);
    REGISTER_HWACCEL(H264_VAAPI,        h264_vaapi);
    REGISTER_HWACCEL(H264_VDA,          h264_vda);
    REGISTER_HWACCEL(H264_VDA_OLD,      h264_vda_old);
    REGISTER_HWACCEL(H264_VDPAU,        h264_vdpau);
    REGISTER_HWACCEL(H264_VIDEOTOOLBOX, h264_videotoolbox);
    REGISTER_HWACCEL(HEVC_CUVID,        hevc_cuvid);
    REGISTER_HWACCEL(HEVC_D3D11VA,      hevc_d3d11va);
    REGISTER_HWACCEL(HEVC_DXVA2,        hevc_dxva2);
    REGISTER_HWACCEL(HEVC_MEDIACODEC,   hevc_mediacodec);
    REGISTER_HWACCEL(HEVC_QSV,          hevc_qsv);
    REGISTER_HWACCEL(HEVC_VAAPI,        hevc_vaapi);
    REGISTER_HWACCEL(HEVC_VDPAU,        hevc_vdpau);
    REGISTER_HWACCEL(MJPEG_CUVID,       mjpeg_cuvid);
    REGISTER_HWACCEL(MPEG1_CUVID,       mpeg1_cuvid);
    REGISTER_HWACCEL(MPEG1_XVMC,        mpeg1_xvmc);
    REGISTER_HWACCEL(MPEG1_VDPAU,       mpeg1_vdpau);
    REGISTER_HWACCEL(MPEG1_VIDEOTOOLBOX, mpeg1_videotoolbox);
    REGISTER_HWACCEL(MPEG2_CUVID,       mpeg2_cuvid);
    REGISTER_HWACCEL(MPEG2_XVMC,        mpeg2_xvmc);
    REGISTER_HWACCEL(MPEG2_D3D11VA,     mpeg2_d3d11va);
    REGISTER_HWACCEL(MPEG2_DXVA2,       mpeg2_dxva2);
    REGISTER_HWACCEL(MPEG2_MMAL,        mpeg2_mmal);
    REGISTER_HWACCEL(MPEG2_QSV,         mpeg2_qsv);
    REGISTER_HWACCEL(MPEG2_VAAPI,       mpeg2_vaapi);
    REGISTER_HWACCEL(MPEG2_VDPAU,       mpeg2_vdpau);
    REGISTER_HWACCEL(MPEG2_VIDEOTOOLBOX, mpeg2_videotoolbox);
    REGISTER_HWACCEL(MPEG4_CUVID,       mpeg4_cuvid);
    REGISTER_HWACCEL(MPEG4_MEDIACODEC,  mpeg4_mediacodec);
    REGISTER_HWACCEL(MPEG4_MMAL,        mpeg4_mmal);
    REGISTER_HWACCEL(MPEG4_VAAPI,       mpeg4_vaapi);
    REGISTER_HWACCEL(MPEG4_VDPAU,       mpeg4_vdpau);
    REGISTER_HWACCEL(MPEG4_VIDEOTOOLBOX, mpeg4_videotoolbox);
    REGISTER_HWACCEL(VC1_CUVID,         vc1_cuvid);
    REGISTER_HWACCEL(VC1_D3D11VA,       vc1_d3d11va);
    REGISTER_HWACCEL(VC1_DXVA2,         vc1_dxva2);
    REGISTER_HWACCEL(VC1_VAAPI,         vc1_vaapi);
    REGISTER_HWACCEL(VC1_VDPAU,         vc1_vdpau);
    REGISTER_HWACCEL(VC1_MMAL,          vc1_mmal);
    REGISTER_HWACCEL(VC1_QSV,           vc1_qsv);
    REGISTER_HWACCEL(VP8_CUVID,         vp8_cuvid);
    REGISTER_HWACCEL(VP8_MEDIACODEC,    vp8_mediacodec);
    REGISTER_HWACCEL(VP9_CUVID,         vp9_cuvid);
    REGISTER_HWACCEL(VP9_D3D11VA,       vp9_d3d11va);
    REGISTER_HWACCEL(VP9_DXVA2,         vp9_dxva2);
    REGISTER_HWACCEL(VP9_MEDIACODEC,    vp9_mediacodec);
    REGISTER_HWACCEL(VP9_VAAPI,         vp9_vaapi);
    REGISTER_HWACCEL(WMV3_D3D11VA,      wmv3_d3d11va);
    REGISTER_HWACCEL(WMV3_DXVA2,        wmv3_dxva2);
    REGISTER_HWACCEL(WMV3_VAAPI,        wmv3_vaapi);
    REGISTER_HWACCEL(WMV3_VDPAU,        wmv3_vdpau);

    /* video codecs */
    REGISTER_ENCODER(A64MULTI,          a64multi);
    REGISTER_ENCODER(A64MULTI5,         a64multi5);
    REGISTER_DECODER(AASC,              aasc);
    REGISTER_DECODER(AIC,               aic);
    REGISTER_ENCDEC (ALIAS_PIX,         alias_pix);
    REGISTER_ENCDEC (AMV,               amv);
    REGISTER_DECODER(ANM,               anm);
    REGISTER_DECODER(ANSI,              ansi);
    REGISTER_ENCDEC (APNG,              apng);
    REGISTER_ENCDEC (ASV1,              asv1);
    REGISTER_ENCDEC (ASV2,              asv2);
    REGISTER_DECODER(AURA,              aura);
    REGISTER_DECODER(AURA2,             aura2);
    REGISTER_ENCDEC (AVRP,              avrp);
    REGISTER_DECODER(AVRN,              avrn);
    REGISTER_DECODER(AVS,               avs);
    REGISTER_ENCDEC (AVUI,              avui);
    REGISTER_ENCDEC (AYUV,              ayuv);
    REGISTER_DECODER(BETHSOFTVID,       bethsoftvid);
    REGISTER_DECODER(BFI,               bfi);
    REGISTER_DECODER(BINK,              bink);
    REGISTER_ENCDEC (BMP,               bmp);
    REGISTER_DECODER(BMV_VIDEO,         bmv_video);
    REGISTER_DECODER(BRENDER_PIX,       brender_pix);
    REGISTER_DECODER(C93,               c93);
    REGISTER_DECODER(CAVS,              cavs);
    REGISTER_DECODER(CDGRAPHICS,        cdgraphics);
    REGISTER_DECODER(CDXL,              cdxl);
    REGISTER_DECODER(CFHD,              cfhd);
    REGISTER_ENCDEC (CINEPAK,           cinepak);
    REGISTER_ENCDEC (CLJR,              cljr);
    REGISTER_DECODER(CLLC,              cllc);
    REGISTER_ENCDEC (COMFORTNOISE,      comfortnoise);
    REGISTER_DECODER(CPIA,              cpia);
    REGISTER_DECODER(CSCD,              cscd);
    REGISTER_DECODER(CYUV,              cyuv);
    REGISTER_DECODER(DDS,               dds);
    REGISTER_DECODER(DFA,               dfa);
    REGISTER_DECODER(DIRAC,             dirac);
    REGISTER_ENCDEC (DNXHD,             dnxhd);
    REGISTER_ENCDEC (DPX,               dpx);
    REGISTER_DECODER(DSICINVIDEO,       dsicinvideo);
    REGISTER_DECODER(DVAUDIO,           dvaudio);
    REGISTER_ENCDEC (DVVIDEO,           dvvideo);
    REGISTER_DECODER(DXA,               dxa);
    REGISTER_DECODER(DXTORY,            dxtory);
    REGISTER_DECODER(DXV,               dxv);
    REGISTER_DECODER(EACMV,             eacmv);
    REGISTER_DECODER(EAMAD,             eamad);
    REGISTER_DECODER(EATGQ,             eatgq);
    REGISTER_DECODER(EATGV,             eatgv);
    REGISTER_DECODER(EATQI,             eatqi);
    REGISTER_DECODER(EIGHTBPS,          eightbps);
    REGISTER_DECODER(EIGHTSVX_EXP,      eightsvx_exp);
    REGISTER_DECODER(EIGHTSVX_FIB,      eightsvx_fib);
    REGISTER_DECODER(ESCAPE124,         escape124);
    REGISTER_DECODER(ESCAPE130,         escape130);
    REGISTER_DECODER(EXR,               exr);
    REGISTER_ENCDEC (FFV1,              ffv1);
    REGISTER_ENCDEC (FFVHUFF,           ffvhuff);
    REGISTER_DECODER(FIC,               fic);
    REGISTER_ENCDEC (FLASHSV,           flashsv);
    REGISTER_ENCDEC (FLASHSV2,          flashsv2);
    REGISTER_DECODER(FLIC,              flic);
    REGISTER_ENCDEC (FLV,               flv);
    REGISTER_DECODER(FOURXM,            fourxm);
    REGISTER_DECODER(FRAPS,             fraps);
    REGISTER_DECODER(FRWU,              frwu);
    REGISTER_DECODER(G2M,               g2m);
    REGISTER_ENCDEC (GIF,               gif);
    REGISTER_ENCDEC (H261,              h261);
    REGISTER_ENCDEC (H263,              h263);
    REGISTER_DECODER(H263I,             h263i);
    REGISTER_ENCDEC (H263P,             h263p);
    REGISTER_DECODER(H264,              h264);
    REGISTER_DECODER(H264_CRYSTALHD,    h264_crystalhd);
    REGISTER_DECODER(H264_MEDIACODEC,   h264_mediacodec);
    REGISTER_DECODER(H264_MMAL,         h264_mmal);
    REGISTER_DECODER(H264_QSV,          h264_qsv);
    REGISTER_DECODER(H264_VDA,          h264_vda);
#if FF_API_VDPAU
    REGISTER_DECODER(H264_VDPAU,        h264_vdpau);
#endif
    REGISTER_ENCDEC (HAP,               hap);
    REGISTER_DECODER(HEVC,              hevc);
    REGISTER_DECODER(HEVC_QSV,          hevc_qsv);
    REGISTER_DECODER(HNM4_VIDEO,        hnm4_video);
    REGISTER_DECODER(HQ_HQA,            hq_hqa);
    REGISTER_DECODER(HQX,               hqx);
    REGISTER_ENCDEC (HUFFYUV,           huffyuv);
    REGISTER_DECODER(IDCIN,             idcin);
    REGISTER_DECODER(IFF_ILBM,          iff_ilbm);
    REGISTER_DECODER(INDEO2,            indeo2);
    REGISTER_DECODER(INDEO3,            indeo3);
    REGISTER_DECODER(INDEO4,            indeo4);
    REGISTER_DECODER(INDEO5,            indeo5);
    REGISTER_DECODER(INTERPLAY_VIDEO,   interplay_video);
    REGISTER_ENCDEC (JPEG2000,          jpeg2000);
    REGISTER_ENCDEC (JPEGLS,            jpegls);
    REGISTER_DECODER(JV,                jv);
    REGISTER_DECODER(KGV1,              kgv1);
    REGISTER_DECODER(KMVC,              kmvc);
    REGISTER_DECODER(LAGARITH,          lagarith);
    REGISTER_ENCODER(LJPEG,             ljpeg);
    REGISTER_DECODER(LOCO,              loco);
    REGISTER_DECODER(M101,              m101);
    REGISTER_DECODER(MAGICYUV,          magicyuv);
    REGISTER_DECODER(MDEC,              mdec);
    REGISTER_DECODER(MIMIC,             mimic);
    REGISTER_ENCDEC (MJPEG,             mjpeg);
    REGISTER_DECODER(MJPEGB,            mjpegb);
    REGISTER_DECODER(MMVIDEO,           mmvideo);
    REGISTER_DECODER(MOTIONPIXELS,      motionpixels);
#if FF_API_XVMC
    REGISTER_DECODER(MPEG_XVMC,         mpeg_xvmc);
#endif /* FF_API_XVMC */
    REGISTER_ENCDEC (MPEG1VIDEO,        mpeg1video);
    REGISTER_ENCDEC (MPEG2VIDEO,        mpeg2video);
    REGISTER_ENCDEC (MPEG4,             mpeg4);
    REGISTER_DECODER(MPEG4_CRYSTALHD,   mpeg4_crystalhd);
    REGISTER_DECODER(MPEG4_MMAL,        mpeg4_mmal);
#if FF_API_VDPAU
    REGISTER_DECODER(MPEG4_VDPAU,       mpeg4_vdpau);
#endif
    REGISTER_DECODER(MPEGVIDEO,         mpegvideo);
#if FF_API_VDPAU
    REGISTER_DECODER(MPEG_VDPAU,        mpeg_vdpau);
    REGISTER_DECODER(MPEG1_VDPAU,       mpeg1_vdpau);
#endif
    REGISTER_DECODER(MPEG2_MMAL,        mpeg2_mmal);
    REGISTER_DECODER(MPEG2_CRYSTALHD,   mpeg2_crystalhd);
    REGISTER_DECODER(MPEG2_QSV,         mpeg2_qsv);
    REGISTER_DECODER(MSA1,              msa1);
    REGISTER_DECODER(MSMPEG4_CRYSTALHD, msmpeg4_crystalhd);
    REGISTER_DECODER(MSMPEG4V1,         msmpeg4v1);
    REGISTER_ENCDEC (MSMPEG4V2,         msmpeg4v2);
    REGISTER_ENCDEC (MSMPEG4V3,         msmpeg4v3);
    REGISTER_DECODER(MSRLE,             msrle);
    REGISTER_DECODER(MSS1,              mss1);
    REGISTER_DECODER(MSS2,              mss2);
    REGISTER_ENCDEC (MSVIDEO1,          msvideo1);
    REGISTER_DECODER(MSZH,              mszh);
    REGISTER_DECODER(MTS2,              mts2);
    REGISTER_DECODER(MVC1,              mvc1);
    REGISTER_DECODER(MVC2,              mvc2);
    REGISTER_DECODER(MXPEG,             mxpeg);
    REGISTER_DECODER(NUV,               nuv);
    REGISTER_DECODER(PAF_VIDEO,         paf_video);
    REGISTER_ENCDEC (PAM,               pam);
    REGISTER_ENCDEC (PBM,               pbm);
    REGISTER_ENCDEC (PCX,               pcx);
    REGISTER_ENCDEC (PGM,               pgm);
    REGISTER_ENCDEC (PGMYUV,            pgmyuv);
    REGISTER_DECODER(PICTOR,            pictor);
    REGISTER_ENCDEC (PNG,               png);
    REGISTER_ENCDEC (PPM,               ppm);
    REGISTER_ENCDEC (PRORES,            prores);
    REGISTER_ENCODER(PRORES_AW,         prores_aw);
    REGISTER_ENCODER(PRORES_KS,         prores_ks);
    REGISTER_DECODER(PRORES_LGPL,       prores_lgpl);
    REGISTER_DECODER(PTX,               ptx);
    REGISTER_DECODER(QDRAW,             qdraw);
    REGISTER_DECODER(QPEG,              qpeg);
    REGISTER_ENCDEC (QTRLE,             qtrle);
    REGISTER_ENCDEC (R10K,              r10k);
    REGISTER_ENCDEC (R210,              r210);
    REGISTER_ENCDEC (RAWVIDEO,          rawvideo);
    REGISTER_DECODER(RL2,               rl2);
    REGISTER_ENCDEC (ROQ,               roq);
    REGISTER_DECODER(RPZA,              rpza);
    REGISTER_DECODER(RSCC,              rscc);
    REGISTER_ENCDEC (RV10,              rv10);
    REGISTER_ENCDEC (RV20,              rv20);
    REGISTER_DECODER(RV30,              rv30);
    REGISTER_DECODER(RV40,              rv40);
    REGISTER_ENCDEC (S302M,             s302m);
    REGISTER_DECODER(SANM,              sanm);
    REGISTER_DECODER(SCREENPRESSO,      screenpresso);
    REGISTER_DECODER(SDX2_DPCM,         sdx2_dpcm);
    REGISTER_ENCDEC (SGI,               sgi);
    REGISTER_DECODER(SGIRLE,            sgirle);
    REGISTER_DECODER(SHEERVIDEO,        sheervideo);
    REGISTER_DECODER(SMACKER,           smacker);
    REGISTER_DECODER(SMC,               smc);
    REGISTER_DECODER(SMVJPEG,           smvjpeg);
    REGISTER_ENCDEC (SNOW,              snow);
    REGISTER_DECODER(SP5X,              sp5x);
    REGISTER_ENCDEC (SUNRAST,           sunrast);
    REGISTER_ENCDEC (SVQ1,              svq1);
    REGISTER_DECODER(SVQ3,              svq3);
    REGISTER_ENCDEC (TARGA,             targa);
    REGISTER_DECODER(TARGA_Y216,        targa_y216);
    REGISTER_DECODER(TDSC,              tdsc);
    REGISTER_DECODER(THEORA,            theora);
    REGISTER_DECODER(THP,               thp);
    REGISTER_DECODER(TIERTEXSEQVIDEO,   tiertexseqvideo);
    REGISTER_ENCDEC (TIFF,              tiff);
    REGISTER_DECODER(TMV,               tmv);
    REGISTER_DECODER(TRUEMOTION1,       truemotion1);
    REGISTER_DECODER(TRUEMOTION2,       truemotion2);
    REGISTER_DECODER(TRUEMOTION2RT,     truemotion2rt);
    REGISTER_DECODER(TSCC,              tscc);
    REGISTER_DECODER(TSCC2,             tscc2);
    REGISTER_DECODER(TXD,               txd);
    REGISTER_DECODER(ULTI,              ulti);
    REGISTER_ENCDEC (UTVIDEO,           utvideo);
    REGISTER_ENCDEC (V210,              v210);
    REGISTER_DECODER(V210X,             v210x);
    REGISTER_ENCDEC (V308,              v308);
    REGISTER_ENCDEC (V408,              v408);
    REGISTER_ENCDEC (V410,              v410);
    REGISTER_DECODER(VB,                vb);
    REGISTER_DECODER(VBLE,              vble);
    REGISTER_DECODER(VC1,               vc1);
    REGISTER_DECODER(VC1_CRYSTALHD,     vc1_crystalhd);
#if FF_API_VDPAU
    REGISTER_DECODER(VC1_VDPAU,         vc1_vdpau);
#endif
    REGISTER_DECODER(VC1IMAGE,          vc1image);
    REGISTER_DECODER(VC1_MMAL,          vc1_mmal);
    REGISTER_DECODER(VC1_QSV,           vc1_qsv);
    REGISTER_ENCODER(VC2,               vc2);
    REGISTER_DECODER(VCR1,              vcr1);
    REGISTER_DECODER(VMDVIDEO,          vmdvideo);
    REGISTER_DECODER(VMNC,              vmnc);
    REGISTER_DECODER(VP3,               vp3);
    REGISTER_DECODER(VP5,               vp5);
    REGISTER_DECODER(VP6,               vp6);
    REGISTER_DECODER(VP6A,              vp6a);
    REGISTER_DECODER(VP6F,              vp6f);
    REGISTER_DECODER(VP7,               vp7);
    REGISTER_DECODER(VP8,               vp8);
    REGISTER_DECODER(VP9,               vp9);
    REGISTER_DECODER(VQA,               vqa);
    REGISTER_DECODER(WEBP,              webp);
    REGISTER_ENCODER(WRAPPED_AVFRAME,   wrapped_avframe);
    REGISTER_ENCDEC (WMV1,              wmv1);
    REGISTER_ENCDEC (WMV2,              wmv2);
    REGISTER_DECODER(WMV3,              wmv3);
    REGISTER_DECODER(WMV3_CRYSTALHD,    wmv3_crystalhd);
#if FF_API_VDPAU
    REGISTER_DECODER(WMV3_VDPAU,        wmv3_vdpau);
#endif
    REGISTER_DECODER(WMV3IMAGE,         wmv3image);
    REGISTER_DECODER(WNV1,              wnv1);
    REGISTER_DECODER(XAN_WC3,           xan_wc3);
    REGISTER_DECODER(XAN_WC4,           xan_wc4);
    REGISTER_ENCDEC (XBM,               xbm);
    REGISTER_ENCDEC (XFACE,             xface);
    REGISTER_DECODER(XL,                xl);
    REGISTER_ENCDEC (XWD,               xwd);
    REGISTER_ENCDEC (Y41P,              y41p);
    REGISTER_DECODER(YLC,               ylc);
    REGISTER_DECODER(YOP,               yop);
    REGISTER_ENCDEC (YUV4,              yuv4);
    REGISTER_DECODER(ZERO12V,           zero12v);
    REGISTER_DECODER(ZEROCODEC,         zerocodec);
    REGISTER_ENCDEC (ZLIB,              zlib);
    REGISTER_ENCDEC (ZMBV,              zmbv);

    /* audio codecs */
    REGISTER_ENCDEC (AAC,               aac);
    REGISTER_DECODER(AAC_FIXED,         aac_fixed);
    REGISTER_DECODER(AAC_LATM,          aac_latm);
    REGISTER_ENCDEC (AC3,               ac3);
    REGISTER_ENCDEC (AC3_FIXED,         ac3_fixed);
    REGISTER_ENCDEC (ALAC,              alac);
    REGISTER_DECODER(ALS,               als);
    REGISTER_DECODER(AMRNB,             amrnb);
    REGISTER_DECODER(AMRWB,             amrwb);
    REGISTER_DECODER(APE,               ape);
    REGISTER_DECODER(ATRAC1,            atrac1);
    REGISTER_DECODER(ATRAC3,            atrac3);
    REGISTER_DECODER(ATRAC3P,           atrac3p);
    REGISTER_DECODER(BINKAUDIO_DCT,     binkaudio_dct);
    REGISTER_DECODER(BINKAUDIO_RDFT,    binkaudio_rdft);
    REGISTER_DECODER(BMV_AUDIO,         bmv_audio);
    REGISTER_DECODER(COOK,              cook);
    REGISTER_ENCDEC (DCA,               dca);
    REGISTER_DECODER(DSD_LSBF,          dsd_lsbf);
    REGISTER_DECODER(DSD_MSBF,          dsd_msbf);
    REGISTER_DECODER(DSD_LSBF_PLANAR,   dsd_lsbf_planar);
    REGISTER_DECODER(DSD_MSBF_PLANAR,   dsd_msbf_planar);
    REGISTER_DECODER(DSICINAUDIO,       dsicinaudio);
    REGISTER_DECODER(DSS_SP,            dss_sp);
    REGISTER_DECODER(DST,               dst);
    REGISTER_ENCDEC (EAC3,              eac3);
    REGISTER_DECODER(EVRC,              evrc);
    REGISTER_DECODER(FFWAVESYNTH,       ffwavesynth);
    REGISTER_ENCDEC (FLAC,              flac);
    REGISTER_ENCDEC (G723_1,            g723_1);
    REGISTER_DECODER(G729,              g729);
    REGISTER_DECODER(GSM,               gsm);
    REGISTER_DECODER(GSM_MS,            gsm_ms);
    REGISTER_DECODER(IAC,               iac);
    REGISTER_DECODER(IMC,               imc);
    REGISTER_DECODER(INTERPLAY_ACM,     interplay_acm);
    REGISTER_DECODER(MACE3,             mace3);
    REGISTER_DECODER(MACE6,             mace6);
    REGISTER_DECODER(METASOUND,         metasound);
    REGISTER_ENCDEC (MLP,               mlp);
    REGISTER_DECODER(MP1,               mp1);
    REGISTER_DECODER(MP1FLOAT,          mp1float);
    REGISTER_ENCDEC (MP2,               mp2);
    REGISTER_DECODER(MP2FLOAT,          mp2float);
    REGISTER_ENCODER(MP2FIXED,          mp2fixed);
    REGISTER_DECODER(MP3,               mp3);
    REGISTER_DECODER(MP3FLOAT,          mp3float);
    REGISTER_DECODER(MP3ADU,            mp3adu);
    REGISTER_DECODER(MP3ADUFLOAT,       mp3adufloat);
    REGISTER_DECODER(MP3ON4,            mp3on4);
    REGISTER_DECODER(MP3ON4FLOAT,       mp3on4float);
    REGISTER_DECODER(MPC7,              mpc7);
    REGISTER_DECODER(MPC8,              mpc8);
    REGISTER_ENCDEC (NELLYMOSER,        nellymoser);
    REGISTER_DECODER(ON2AVC,            on2avc);
    REGISTER_DECODER(OPUS,              opus);
    REGISTER_DECODER(PAF_AUDIO,         paf_audio);
    REGISTER_DECODER(QCELP,             qcelp);
    REGISTER_DECODER(QDM2,              qdm2);
    REGISTER_ENCDEC (RA_144,            ra_144);
    REGISTER_DECODER(RA_288,            ra_288);
    REGISTER_DECODER(RALF,              ralf);
    REGISTER_DECODER(SHORTEN,           shorten);
    REGISTER_DECODER(SIPR,              sipr);
    REGISTER_DECODER(SMACKAUD,          smackaud);
    REGISTER_ENCDEC (SONIC,             sonic);
    REGISTER_ENCODER(SONIC_LS,          sonic_ls);
    REGISTER_DECODER(TAK,               tak);
    REGISTER_ENCDEC (TRUEHD,            truehd);
    REGISTER_DECODER(TRUESPEECH,        truespeech);
    REGISTER_ENCDEC (TTA,               tta);
    REGISTER_DECODER(TWINVQ,            twinvq);
    REGISTER_DECODER(VMDAUDIO,          vmdaudio);
    REGISTER_ENCDEC (VORBIS,            vorbis);
    REGISTER_ENCDEC (WAVPACK,           wavpack);
    REGISTER_DECODER(WMALOSSLESS,       wmalossless);
    REGISTER_DECODER(WMAPRO,            wmapro);
    REGISTER_ENCDEC (WMAV1,             wmav1);
    REGISTER_ENCDEC (WMAV2,             wmav2);
    REGISTER_DECODER(WMAVOICE,          wmavoice);
    REGISTER_DECODER(WS_SND1,           ws_snd1);
    REGISTER_DECODER(XMA1,              xma1);
    REGISTER_DECODER(XMA2,              xma2);

    /* PCM codecs */
    REGISTER_ENCDEC (PCM_ALAW,          pcm_alaw);
    REGISTER_DECODER(PCM_BLURAY,        pcm_bluray);
    REGISTER_DECODER(PCM_DVD,           pcm_dvd);
    REGISTER_ENCDEC (PCM_F32BE,         pcm_f32be);
    REGISTER_ENCDEC (PCM_F32LE,         pcm_f32le);
    REGISTER_ENCDEC (PCM_F64BE,         pcm_f64be);
    REGISTER_ENCDEC (PCM_F64LE,         pcm_f64le);
    REGISTER_DECODER(PCM_LXF,           pcm_lxf);
    REGISTER_ENCDEC (PCM_MULAW,         pcm_mulaw);
    REGISTER_ENCDEC (PCM_S8,            pcm_s8);
    REGISTER_ENCDEC (PCM_S8_PLANAR,     pcm_s8_planar);
    REGISTER_ENCDEC (PCM_S16BE,         pcm_s16be);
    REGISTER_ENCDEC (PCM_S16BE_PLANAR,  pcm_s16be_planar);
    REGISTER_ENCDEC (PCM_S16LE,         pcm_s16le);
    REGISTER_ENCDEC (PCM_S16LE_PLANAR,  pcm_s16le_planar);
    REGISTER_ENCDEC (PCM_S24BE,         pcm_s24be);
    REGISTER_ENCDEC (PCM_S24DAUD,       pcm_s24daud);
    REGISTER_ENCDEC (PCM_S24LE,         pcm_s24le);
    REGISTER_ENCDEC (PCM_S24LE_PLANAR,  pcm_s24le_planar);
    REGISTER_ENCDEC (PCM_S32BE,         pcm_s32be);
    REGISTER_ENCDEC (PCM_S32LE,         pcm_s32le);
    REGISTER_ENCDEC (PCM_S32LE_PLANAR,  pcm_s32le_planar);
    REGISTER_ENCDEC (PCM_S64BE,         pcm_s64be);
    REGISTER_ENCDEC (PCM_S64LE,         pcm_s64le);
    REGISTER_ENCDEC (PCM_U8,            pcm_u8);
    REGISTER_ENCDEC (PCM_U16BE,         pcm_u16be);
    REGISTER_ENCDEC (PCM_U16LE,         pcm_u16le);
    REGISTER_ENCDEC (PCM_U24BE,         pcm_u24be);
    REGISTER_ENCDEC (PCM_U24LE,         pcm_u24le);
    REGISTER_ENCDEC (PCM_U32BE,         pcm_u32be);
    REGISTER_ENCDEC (PCM_U32LE,         pcm_u32le);
    REGISTER_DECODER(PCM_ZORK,          pcm_zork);

    /* DPCM codecs */
    REGISTER_DECODER(INTERPLAY_DPCM,    interplay_dpcm);
    REGISTER_ENCDEC (ROQ_DPCM,          roq_dpcm);
    REGISTER_DECODER(SOL_DPCM,          sol_dpcm);
    REGISTER_DECODER(XAN_DPCM,          xan_dpcm);

    /* ADPCM codecs */
    REGISTER_DECODER(ADPCM_4XM,         adpcm_4xm);
    REGISTER_ENCDEC (ADPCM_ADX,         adpcm_adx);
    REGISTER_DECODER(ADPCM_AFC,         adpcm_afc);
    REGISTER_DECODER(ADPCM_AICA,        adpcm_aica);
    REGISTER_DECODER(ADPCM_CT,          adpcm_ct);
    REGISTER_DECODER(ADPCM_DTK,         adpcm_dtk);
    REGISTER_DECODER(ADPCM_EA,          adpcm_ea);
    REGISTER_DECODER(ADPCM_EA_MAXIS_XA, adpcm_ea_maxis_xa);
    REGISTER_DECODER(ADPCM_EA_R1,       adpcm_ea_r1);
    REGISTER_DECODER(ADPCM_EA_R2,       adpcm_ea_r2);
    REGISTER_DECODER(ADPCM_EA_R3,       adpcm_ea_r3);
    REGISTER_DECODER(ADPCM_EA_XAS,      adpcm_ea_xas);
    REGISTER_ENCDEC (ADPCM_G722,        adpcm_g722);
    REGISTER_ENCDEC (ADPCM_G726,        adpcm_g726);
    REGISTER_DECODER(ADPCM_G726LE,      adpcm_g726le);
    REGISTER_DECODER(ADPCM_IMA_AMV,     adpcm_ima_amv);
    REGISTER_DECODER(ADPCM_IMA_APC,     adpcm_ima_apc);
    REGISTER_DECODER(ADPCM_IMA_DAT4,    adpcm_ima_dat4);
    REGISTER_DECODER(ADPCM_IMA_DK3,     adpcm_ima_dk3);
    REGISTER_DECODER(ADPCM_IMA_DK4,     adpcm_ima_dk4);
    REGISTER_DECODER(ADPCM_IMA_EA_EACS, adpcm_ima_ea_eacs);
    REGISTER_DECODER(ADPCM_IMA_EA_SEAD, adpcm_ima_ea_sead);
    REGISTER_DECODER(ADPCM_IMA_ISS,     adpcm_ima_iss);
    REGISTER_DECODER(ADPCM_IMA_OKI,     adpcm_ima_oki);
    REGISTER_ENCDEC (ADPCM_IMA_QT,      adpcm_ima_qt);
    REGISTER_DECODER(ADPCM_IMA_RAD,     adpcm_ima_rad);
    REGISTER_DECODER(ADPCM_IMA_SMJPEG,  adpcm_ima_smjpeg);
    REGISTER_ENCDEC (ADPCM_IMA_WAV,     adpcm_ima_wav);
    REGISTER_DECODER(ADPCM_IMA_WS,      adpcm_ima_ws);
    REGISTER_ENCDEC (ADPCM_MS,          adpcm_ms);
    REGISTER_DECODER(ADPCM_MTAF,        adpcm_mtaf);
    REGISTER_DECODER(ADPCM_PSX,         adpcm_psx);
    REGISTER_DECODER(ADPCM_SBPRO_2,     adpcm_sbpro_2);
    REGISTER_DECODER(ADPCM_SBPRO_3,     adpcm_sbpro_3);
    REGISTER_DECODER(ADPCM_SBPRO_4,     adpcm_sbpro_4);
    REGISTER_ENCDEC (ADPCM_SWF,         adpcm_swf);
    REGISTER_DECODER(ADPCM_THP,         adpcm_thp);
    REGISTER_DECODER(ADPCM_THP_LE,      adpcm_thp_le);
    REGISTER_DECODER(ADPCM_VIMA,        adpcm_vima);
    REGISTER_DECODER(ADPCM_XA,          adpcm_xa);
    REGISTER_ENCDEC (ADPCM_YAMAHA,      adpcm_yamaha);

    /* subtitles */
    REGISTER_ENCDEC (SSA,               ssa);
    REGISTER_ENCDEC (ASS,               ass);
    REGISTER_DECODER(CCAPTION,          ccaption);
    REGISTER_ENCDEC (DVBSUB,            dvbsub);
    REGISTER_ENCDEC (DVDSUB,            dvdsub);
    REGISTER_DECODER(JACOSUB,           jacosub);
    REGISTER_DECODER(MICRODVD,          microdvd);
    REGISTER_ENCDEC (MOVTEXT,           movtext);
    REGISTER_DECODER(MPL2,              mpl2);
    REGISTER_DECODER(PGSSUB,            pgssub);
    REGISTER_DECODER(PJS,               pjs);
    REGISTER_DECODER(REALTEXT,          realtext);
    REGISTER_DECODER(SAMI,              sami);
    REGISTER_ENCDEC (SRT,               srt);
    REGISTER_DECODER(STL,               stl);
    REGISTER_ENCDEC (SUBRIP,            subrip);
    REGISTER_DECODER(SUBVIEWER,         subviewer);
    REGISTER_DECODER(SUBVIEWER1,        subviewer1);
    REGISTER_ENCDEC (TEXT,              text);
    REGISTER_DECODER(VPLAYER,           vplayer);
    REGISTER_ENCDEC (WEBVTT,            webvtt);
    REGISTER_ENCDEC (XSUB,              xsub);

    /* external libraries */
    REGISTER_ENCDEC (AAC_AT,            aac_at);
    REGISTER_DECODER(AC3_AT,            ac3_at);
    REGISTER_DECODER(ADPCM_IMA_QT_AT,   adpcm_ima_qt_at);
    REGISTER_ENCDEC (ALAC_AT,           alac_at);
    REGISTER_DECODER(AMR_NB_AT,         amr_nb_at);
    REGISTER_DECODER(EAC3_AT,           eac3_at);
    REGISTER_DECODER(GSM_MS_AT,         gsm_ms_at);
    REGISTER_ENCDEC (ILBC_AT,           ilbc_at);
    REGISTER_DECODER(MP1_AT,            mp1_at);
    REGISTER_DECODER(MP2_AT,            mp2_at);
    REGISTER_DECODER(MP3_AT,            mp3_at);
    REGISTER_ENCDEC (PCM_ALAW_AT,       pcm_alaw_at);
    REGISTER_ENCDEC (PCM_MULAW_AT,      pcm_mulaw_at);
    REGISTER_DECODER(QDMC_AT,           qdmc_at);
    REGISTER_DECODER(QDM2_AT,           qdm2_at);
    REGISTER_DECODER(LIBCELT,           libcelt);
    REGISTER_ENCDEC (LIBFDK_AAC,        libfdk_aac);
    REGISTER_ENCDEC (LIBGSM,            libgsm);
    REGISTER_ENCDEC (LIBGSM_MS,         libgsm_ms);
    REGISTER_ENCDEC (LIBILBC,           libilbc);
    REGISTER_ENCODER(LIBMP3LAME,        libmp3lame);
    REGISTER_ENCDEC (LIBOPENCORE_AMRNB, libopencore_amrnb);
    REGISTER_DECODER(LIBOPENCORE_AMRWB, libopencore_amrwb);
    REGISTER_ENCDEC (LIBOPENJPEG,       libopenjpeg);
    REGISTER_ENCDEC (LIBOPUS,           libopus);
    REGISTER_ENCDEC (LIBSCHROEDINGER,   libschroedinger);
    REGISTER_ENCODER(LIBSHINE,          libshine);
    REGISTER_ENCDEC (LIBSPEEX,          libspeex);
    REGISTER_ENCODER(LIBTHEORA,         libtheora);
    REGISTER_ENCODER(LIBTWOLAME,        libtwolame);
    REGISTER_ENCODER(LIBVO_AMRWBENC,    libvo_amrwbenc);
    REGISTER_ENCDEC (LIBVORBIS,         libvorbis);
    REGISTER_ENCDEC (LIBVPX_VP8,        libvpx_vp8);
    REGISTER_ENCDEC (LIBVPX_VP9,        libvpx_vp9);
    REGISTER_ENCODER(LIBWAVPACK,        libwavpack);
    REGISTER_ENCODER(LIBWEBP_ANIM,      libwebp_anim);  /* preferred over libwebp */
    REGISTER_ENCODER(LIBWEBP,           libwebp);
    REGISTER_ENCODER(LIBX262,           libx262);
    REGISTER_ENCODER(LIBX264,           libx264);
    REGISTER_ENCODER(LIBX264RGB,        libx264rgb);
    REGISTER_ENCODER(LIBX265,           libx265);
    REGISTER_ENCODER(LIBXAVS,           libxavs);
    REGISTER_ENCODER(LIBXVID,           libxvid);
    REGISTER_DECODER(LIBZVBI_TELETEXT,  libzvbi_teletext);

    /* text */
    REGISTER_DECODER(BINTEXT,           bintext);
    REGISTER_DECODER(XBIN,              xbin);
    REGISTER_DECODER(IDF,               idf);

    /* external libraries, that shouldn't be used by default if one of the
     * above is available */
    REGISTER_ENCDEC (LIBOPENH264,       libopenh264);
    REGISTER_DECODER(H263_CUVID,        h263_cuvid);
    REGISTER_DECODER(H264_CUVID,        h264_cuvid);
    REGISTER_ENCODER(H264_NVENC,        h264_nvenc);
    REGISTER_ENCODER(H264_OMX,          h264_omx);
    REGISTER_ENCODER(H264_QSV,          h264_qsv);
    REGISTER_ENCODER(H264_VAAPI,        h264_vaapi);
    REGISTER_ENCODER(H264_VIDEOTOOLBOX, h264_videotoolbox);
#if FF_API_NVENC_OLD_NAME
    REGISTER_ENCODER(NVENC,             nvenc);
    REGISTER_ENCODER(NVENC_H264,        nvenc_h264);
    REGISTER_ENCODER(NVENC_HEVC,        nvenc_hevc);
#endif
    REGISTER_DECODER(HEVC_CUVID,        hevc_cuvid);
    REGISTER_DECODER(HEVC_MEDIACODEC,   hevc_mediacodec);
    REGISTER_ENCODER(HEVC_NVENC,        hevc_nvenc);
    REGISTER_ENCODER(HEVC_QSV,          hevc_qsv);
    REGISTER_ENCODER(HEVC_VAAPI,        hevc_vaapi);
    REGISTER_ENCODER(LIBKVAZAAR,        libkvazaar);
    REGISTER_DECODER(MJPEG_CUVID,       mjpeg_cuvid);
    REGISTER_ENCODER(MJPEG_VAAPI,       mjpeg_vaapi);
    REGISTER_DECODER(MPEG1_CUVID,       mpeg1_cuvid);
    REGISTER_DECODER(MPEG2_CUVID,       mpeg2_cuvid);
    REGISTER_ENCODER(MPEG2_QSV,         mpeg2_qsv);
    REGISTER_DECODER(MPEG4_CUVID,       mpeg4_cuvid);
    REGISTER_DECODER(MPEG4_MEDIACODEC,  mpeg4_mediacodec);
    REGISTER_DECODER(VC1_CUVID,         vc1_cuvid);
    REGISTER_DECODER(VP8_CUVID,         vp8_cuvid);
    REGISTER_DECODER(VP8_MEDIACODEC,    vp8_mediacodec);
    REGISTER_DECODER(VP9_CUVID,         vp9_cuvid);
    REGISTER_DECODER(VP9_MEDIACODEC,    vp9_mediacodec);

    /* parsers */
    REGISTER_PARSER(AAC,                aac);
    REGISTER_PARSER(AAC_LATM,           aac_latm);
    REGISTER_PARSER(AC3,                ac3);
    REGISTER_PARSER(ADX,                adx);
    REGISTER_PARSER(BMP,                bmp);
    REGISTER_PARSER(CAVSVIDEO,          cavsvideo);
    REGISTER_PARSER(COOK,               cook);
    REGISTER_PARSER(DCA,                dca);
    REGISTER_PARSER(DIRAC,              dirac);
    REGISTER_PARSER(DNXHD,              dnxhd);
    REGISTER_PARSER(DPX,                dpx);
    REGISTER_PARSER(DVAUDIO,            dvaudio);
    REGISTER_PARSER(DVBSUB,             dvbsub);
    REGISTER_PARSER(DVDSUB,             dvdsub);
    REGISTER_PARSER(DVD_NAV,            dvd_nav);
    REGISTER_PARSER(FLAC,               flac);
    REGISTER_PARSER(G729,               g729);
    REGISTER_PARSER(GSM,                gsm);
    REGISTER_PARSER(H261,               h261);
    REGISTER_PARSER(H263,               h263);
    REGISTER_PARSER(H264,               h264);
    REGISTER_PARSER(HEVC,               hevc);
    REGISTER_PARSER(MJPEG,              mjpeg);
    REGISTER_PARSER(MLP,                mlp);
    REGISTER_PARSER(MPEG4VIDEO,         mpeg4video);
    REGISTER_PARSER(MPEGAUDIO,          mpegaudio);
    REGISTER_PARSER(MPEGVIDEO,          mpegvideo);
    REGISTER_PARSER(OPUS,               opus);
    REGISTER_PARSER(PNG,                png);
    REGISTER_PARSER(PNM,                pnm);
    REGISTER_PARSER(RV30,               rv30);
    REGISTER_PARSER(RV40,               rv40);
    REGISTER_PARSER(TAK,                tak);
    REGISTER_PARSER(VC1,                vc1);
    REGISTER_PARSER(VORBIS,             vorbis);
    REGISTER_PARSER(VP3,                vp3);
    REGISTER_PARSER(VP8,                vp8);
    REGISTER_PARSER(VP9,                vp9);
}


其中,几个宏的代码如下:

(1). REGISTER_HWACCEL:

详细信息点击这里学习:av_register_hwaccel()

#define REGISTER_HWACCEL(X, x)                                          \
    {                                                                   \
        extern AVHWAccel ff_##x##_hwaccel;                              \
        if (CONFIG_##X##_HWACCEL)                                       \
            av_register_hwaccel(&ff_##x##_hwaccel);                     \
    }


(2). REGISTER_ENCODER:

详细信息点击这里学习:avcodec_register()

#define REGISTER_ENCODER(X, x)                                          \
    {                                                                   \
        extern AVCodec ff_##x##_encoder;                                \
        if (CONFIG_##X##_ENCODER)                                       \
            avcodec_register(&ff_##x##_encoder);                        \
    }

(3). REGISTER_DECODER():

详细信息点击这里学习:avcodec_register()

#define REGISTER_DECODER(X, x)                                          \
    {                                                                   \
        extern AVCodec ff_##x##_decoder;                                \
        if (CONFIG_##X##_DECODER)                                       \
            avcodec_register(&ff_##x##_decoder);                        \
    }

(4). REGISTER_ENCDEC:

详细信息点击这里学习:avcodec_register()

#define REGISTER_ENCDEC(X, x) REGISTER_ENCODER(X, x); REGISTER_DECODER(X, x)


(5). REGISTER_PARSER:

#define REGISTER_PARSER(X, x)                                           \
    {                                                                   \
        extern AVCodecParser ff_##x##_parser;                           \
        if (CONFIG_##X##_PARSER)                                        \
            av_register_codec_parser(&ff_##x##_parser);                 \
    }




。。。。。待续

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