001 ffmpeg
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avdevice注册:
libavdevice/alldevices.c
void avdevice_register_all(void)
{
static int initialized;
if (initialized)
return;
initialized = 1;
/* devices */
REGISTER_INOUTDEV(ALSA, alsa);
REGISTER_INDEV (BKTR, bktr);
REGISTER_OUTDEV (CACA, caca);
REGISTER_INDEV (DSHOW, dshow);
REGISTER_INDEV (DV1394, dv1394);
REGISTER_INDEV (FBDEV, fbdev);
REGISTER_INDEV (IEC61883, iec61883);
REGISTER_INDEV (JACK, jack);
REGISTER_INDEV (LAVFI, lavfi);
REGISTER_INDEV (OPENAL, openal);
REGISTER_INOUTDEV(OSS, oss);
REGISTER_INDEV (PULSE, pulse);
REGISTER_OUTDEV (SDL, sdl);
REGISTER_INOUTDEV(SNDIO, sndio);
REGISTER_INOUTDEV(V4L2, v4l2);
// REGISTER_INDEV (V4L, v4l
REGISTER_INDEV (VFWCAP, vfwcap);
REGISTER_INDEV (X11GRAB, x11grab);
REGISTER_OUTDEV (XV, xv);
/* external libraries */
REGISTER_INDEV (LIBCDIO, libcdio);
REGISTER_INDEV (LIBDC1394, libdc1394);
}
函数实现中,使用到三个宏:
REGISTER_INDEV(X, x)
REGISTER_OUTDEV(X, x)
REGISTER_INOUTDEV(X, x)
#define REGISTER_INDEV(X, x) \
{ \
extern AVInputFormat ff_##x##_demuxer; \
if (CONFIG_##X##_INDEV) \
av_register_input_format(&ff_##x##_demuxer); \
}
函数av_register_input_format:
void av_register_input_format(AVInputFormat *format)
{
AVInputFormat **p = &first_iformat;
format->next = NULL;
while(avpriv_atomic_ptr_cas((void * volatile *)p, NULL, format))
p = &(*p)->next;
}
#define REGISTER_OUTDEV(X, x) \
{ \
extern AVOutputFormat ff_##x##_muxer; \
if (CONFIG_##X##_OUTDEV) \
av_register_output_format(&ff_##x##_muxer); \
}
函数av_register_output_format:
void av_register_output_format(AVOutputFormat *format)
{
AVOutputFormat **p = &first_oformat;
format->next = NULL;
while(avpriv_atomic_ptr_cas((void * volatile *)p, NULL, format))
p = &(*p)->next;
}
demuxer、muxer注册:
libavformat/allformats.c
/* (de)muxers */
REGISTER_MUXER (A64, a64);
REGISTER_DEMUXER (AAC, aac);
REGISTER_MUXDEMUX(AC3, ac3);
REGISTER_DEMUXER (ACT, act);
REGISTER_DEMUXER (ADF, adf);
REGISTER_DEMUXER (ADP, adp);
REGISTER_MUXER (ADTS, adts);
REGISTER_MUXDEMUX(ADX, adx);
REGISTER_DEMUXER (AEA, aea);
REGISTER_DEMUXER (AFC, afc);
REGISTER_MUXDEMUX(AIFF, aiff);
REGISTER_MUXDEMUX(AMR, amr);
REGISTER_DEMUXER (ANM, anm);
REGISTER_DEMUXER (APC, apc);
REGISTER_DEMUXER (APE, ape);
REGISTER_DEMUXER (AQTITLE, aqtitle);
REGISTER_MUXDEMUX(ASF, asf);
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 (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 (CONCAT, concat);
REGISTER_MUXER (CRC, crc);
REGISTER_MUXDEMUX(DATA, data);
REGISTER_MUXDEMUX(DAUD, daud);
REGISTER_DEMUXER (DFA, dfa);
REGISTER_MUXDEMUX(DIRAC, dirac);
REGISTER_MUXDEMUX(DNXHD, dnxhd);
REGISTER_DEMUXER (DSICIN, dsicin);
REGISTER_MUXDEMUX(DTS, dts);
REGISTER_DEMUXER (DTSHD, dtshd);
REGISTER_MUXDEMUX(DV, dv);
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_MUXDEMUX(FILMSTRIP, filmstrip);
REGISTER_MUXDEMUX(FLAC, flac);
REGISTER_DEMUXER (FLIC, flic);
REGISTER_MUXDEMUX(FLV, flv);
REGISTER_DEMUXER (FOURXM, fourxm);
REGISTER_MUXER (FRAMECRC, framecrc);
REGISTER_MUXER (FRAMEMD5, framemd5);
REGISTER_DEMUXER (FRM, frm);
REGISTER_MUXDEMUX(G722, g722);
REGISTER_MUXDEMUX(G723_1, g723_1);
REGISTER_DEMUXER (G729, g729);
REGISTER_MUXDEMUX(GIF, gif);
REGISTER_DEMUXER (GSM, gsm);
REGISTER_MUXDEMUX(GXF, gxf);
REGISTER_MUXDEMUX(H261, h261);
REGISTER_MUXDEMUX(H263, h263);
REGISTER_MUXDEMUX(H264, h264);
REGISTER_DEMUXER (H265, h265);
REGISTER_MUXDEMUX(HLS, hls);
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 (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_MUXDEMUX(JACOSUB, jacosub);
REGISTER_DEMUXER (JV, jv);
REGISTER_MUXDEMUX(LATM, latm);
REGISTER_DEMUXER (LMLM4, lmlm4);
REGISTER_DEMUXER (LOAS, loas);
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 (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_MUXER (MPJPEG, mpjpeg);
REGISTER_DEMUXER (MPL2, mpl2);
REGISTER_DEMUXER (MPSUB, mpsub);
REGISTER_DEMUXER (MSNWC_TCP, msnwc_tcp);
REGISTER_DEMUXER (MTV, mtv);
REGISTER_DEMUXER (MV, mv);
REGISTER_DEMUXER (MVI, mvi);
REGISTER_MUXDEMUX(MXF, mxf);
REGISTER_MUXER (MXF_D10, mxf_d10);
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_MUXDEMUX(OGG, ogg);
REGISTER_MUXDEMUX(OMA, oma);
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_MUXDEMUX(RTSP, rtsp);
REGISTER_DEMUXER (SAMI, sami);
REGISTER_MUXDEMUX(SAP, sap);
REGISTER_DEMUXER (SBG, sbg);
REGISTER_DEMUXER (SDP, sdp);
#if CONFIG_RTPDEC
av_register_rtp_dynamic_payload_handlers();
av_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_DEMUXER (SMACKER, smacker);
REGISTER_MUXDEMUX(SMJPEG, smjpeg);
REGISTER_MUXER (SMOOTHSTREAMING, smoothstreaming);
REGISTER_DEMUXER (SMUSH, smush);
REGISTER_DEMUXER (SOL, sol);
REGISTER_MUXDEMUX(SOX, sox);
REGISTER_MUXDEMUX(SPDIF, spdif);
REGISTER_MUXDEMUX(SRT, srt);
REGISTER_DEMUXER (STR, str);
REGISTER_DEMUXER (SUBVIEWER1, subviewer1);
REGISTER_DEMUXER (SUBVIEWER, subviewer);
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 (TIERTEXSEQ, tiertexseq);
REGISTER_MUXER (MKVTIMESTAMP_V2, mkvtimestamp_v2);
REGISTER_DEMUXER (TMV, tmv);
REGISTER_MUXDEMUX(TRUEHD, truehd);
REGISTER_DEMUXER (TTA, tta);
REGISTER_DEMUXER (TXD, txd);
REGISTER_DEMUXER (TTY, tty);
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 (VPLAYER, vplayer);
REGISTER_DEMUXER (VQF, vqf);
REGISTER_MUXDEMUX(W64, w64);
REGISTER_MUXDEMUX(WAV, wav);
REGISTER_DEMUXER (WC3, wc3);
REGISTER_MUXER (WEBM, webm);
REGISTER_MUXDEMUX(WEBVTT, webvtt);
REGISTER_DEMUXER (WSAUD, wsaud);
REGISTER_DEMUXER (WSVQA, wsvqa);
REGISTER_MUXDEMUX(WTV, wtv);
REGISTER_MUXDEMUX(WV, wv);
REGISTER_DEMUXER (XA, xa);
REGISTER_DEMUXER (XBIN, xbin);
REGISTER_DEMUXER (XMV, xmv);
REGISTER_DEMUXER (XWMA, xwma);
REGISTER_DEMUXER (YOP, yop);
REGISTER_MUXDEMUX(YUV4MPEGPIPE, yuv4mpegpipe);
#define REGISTER_MUXER(X, x) \
{ \
extern AVOutputFormat ff_##x##_muxer; \
if (CONFIG_##X##_MUXER) \
av_register_output_format(&ff_##x##_muxer); \
}
#define REGISTER_DEMUXER(X, x) \
{ \
extern AVInputFormat ff_##x##_demuxer; \
if (CONFIG_##X##_DEMUXER) \
av_register_input_format(&ff_##x##_demuxer); \
}
#define REGISTER_MUXDEMUX(X, x) REGISTER_MUXER(X, x); REGISTER_DEMUXER(X, x)
demuxer、muxer和前面的device注册,都使用av_register_input_format、av_register_output_format函数注册
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