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FFMPEG结构体分析#xff1a;AVCodec_雷霄骅的博客-CSDN博客_avcodec
AVCodec
AVCodec是存储编解码器信息的结构体结构体的定义位于avcodec.h文件中最主要的几个变量 const char *name#xff1a;编解码器的名字#xff0c;比较短const char *long_name#xff…参考链接
FFMPEG结构体分析AVCodec_雷霄骅的博客-CSDN博客_avcodec
AVCodec
AVCodec是存储编解码器信息的结构体结构体的定义位于avcodec.h文件中最主要的几个变量 const char *name编解码器的名字比较短const char *long_name编解码器的名字全称比较长enum AVMediaType type指明了类型是视频音频还是字幕enum AVCodecID idID不重复const AVRational *supported_framerates支持的帧率仅视频const enum AVPixelFormat *pix_fmts支持的像素格式仅视频const int *supported_samplerates支持的采样率仅音频const enum AVSampleFormat *sample_fmts支持的采样格式仅音频const uint64_t *channel_layouts支持的声道数仅音频int priv_data_size私有数据的大小
重点介绍
AVMediaType位于avutil.h文件内
/*** addtogroup lavu_media Media Type* brief Media Type*/enum AVMediaType {AVMEDIA_TYPE_UNKNOWN -1, /// Usually treated as AVMEDIA_TYPE_DATAAVMEDIA_TYPE_VIDEO,AVMEDIA_TYPE_AUDIO,AVMEDIA_TYPE_DATA, /// Opaque data information usually continuousAVMEDIA_TYPE_SUBTITLE,AVMEDIA_TYPE_ATTACHMENT, /// Opaque data information usually sparseAVMEDIA_TYPE_NB
};
AVCodecID位于codec_id.h文件内
/*** Identify the syntax and semantics of the bitstream.* The principle is roughly:* Two decoders with the same ID can decode the same streams.* Two encoders with the same ID can encode compatible streams.* There may be slight deviations from the principle due to implementation* details.** If you add a codec ID to this list, add it so that* 1. no value of an existing codec ID changes (that would break ABI),* 2. it is as close as possible to similar codecs** After adding new codec IDs, do not forget to add an entry to the codec* descriptor list and bump libavcodec minor version.*/
enum AVCodecID {AV_CODEC_ID_NONE,/* video codecs */AV_CODEC_ID_MPEG1VIDEO,AV_CODEC_ID_MPEG2VIDEO, /// preferred ID for MPEG-1/2 video decodingAV_CODEC_ID_H261,AV_CODEC_ID_H263,AV_CODEC_ID_RV10,AV_CODEC_ID_RV20,AV_CODEC_ID_MJPEG,AV_CODEC_ID_MJPEGB,AV_CODEC_ID_LJPEG,AV_CODEC_ID_SP5X,AV_CODEC_ID_JPEGLS,AV_CODEC_ID_MPEG4,AV_CODEC_ID_RAWVIDEO,AV_CODEC_ID_MSMPEG4V1,AV_CODEC_ID_MSMPEG4V2,AV_CODEC_ID_MSMPEG4V3,AV_CODEC_ID_WMV1,AV_CODEC_ID_WMV2,AV_CODEC_ID_H263P,AV_CODEC_ID_H263I,AV_CODEC_ID_FLV1,AV_CODEC_ID_SVQ1,AV_CODEC_ID_SVQ3,AV_CODEC_ID_DVVIDEO,AV_CODEC_ID_HUFFYUV,AV_CODEC_ID_CYUV,AV_CODEC_ID_H264,AV_CODEC_ID_INDEO3,AV_CODEC_ID_VP3,AV_CODEC_ID_THEORA,AV_CODEC_ID_ASV1,AV_CODEC_ID_ASV2,AV_CODEC_ID_FFV1,AV_CODEC_ID_4XM,AV_CODEC_ID_VCR1,AV_CODEC_ID_CLJR,AV_CODEC_ID_MDEC,AV_CODEC_ID_ROQ,AV_CODEC_ID_INTERPLAY_VIDEO,AV_CODEC_ID_XAN_WC3,AV_CODEC_ID_XAN_WC4,AV_CODEC_ID_RPZA,AV_CODEC_ID_CINEPAK,AV_CODEC_ID_WS_VQA,AV_CODEC_ID_MSRLE,AV_CODEC_ID_MSVIDEO1,AV_CODEC_ID_IDCIN,AV_CODEC_ID_8BPS,AV_CODEC_ID_SMC,AV_CODEC_ID_FLIC,AV_CODEC_ID_TRUEMOTION1,AV_CODEC_ID_VMDVIDEO,AV_CODEC_ID_MSZH,AV_CODEC_ID_ZLIB,AV_CODEC_ID_QTRLE,AV_CODEC_ID_TSCC,AV_CODEC_ID_ULTI,AV_CODEC_ID_QDRAW,AV_CODEC_ID_VIXL,AV_CODEC_ID_QPEG,AV_CODEC_ID_PNG,AV_CODEC_ID_PPM,AV_CODEC_ID_PBM,AV_CODEC_ID_PGM,AV_CODEC_ID_PGMYUV,AV_CODEC_ID_PAM,AV_CODEC_ID_FFVHUFF,AV_CODEC_ID_RV30,AV_CODEC_ID_RV40,AV_CODEC_ID_VC1,AV_CODEC_ID_WMV3,AV_CODEC_ID_LOCO,AV_CODEC_ID_WNV1,AV_CODEC_ID_AASC,AV_CODEC_ID_INDEO2,AV_CODEC_ID_FRAPS,AV_CODEC_ID_TRUEMOTION2,AV_CODEC_ID_BMP,AV_CODEC_ID_CSCD,AV_CODEC_ID_MMVIDEO,AV_CODEC_ID_ZMBV,AV_CODEC_ID_AVS,AV_CODEC_ID_SMACKVIDEO,AV_CODEC_ID_NUV,AV_CODEC_ID_KMVC,AV_CODEC_ID_FLASHSV,AV_CODEC_ID_CAVS,AV_CODEC_ID_JPEG2000,AV_CODEC_ID_VMNC,AV_CODEC_ID_VP5,AV_CODEC_ID_VP6,AV_CODEC_ID_VP6F,AV_CODEC_ID_TARGA,AV_CODEC_ID_DSICINVIDEO,AV_CODEC_ID_TIERTEXSEQVIDEO,AV_CODEC_ID_TIFF,AV_CODEC_ID_GIF,AV_CODEC_ID_DXA,AV_CODEC_ID_DNXHD,AV_CODEC_ID_THP,AV_CODEC_ID_SGI,AV_CODEC_ID_C93,AV_CODEC_ID_BETHSOFTVID,AV_CODEC_ID_PTX,AV_CODEC_ID_TXD,AV_CODEC_ID_VP6A,AV_CODEC_ID_AMV,AV_CODEC_ID_VB,AV_CODEC_ID_PCX,AV_CODEC_ID_SUNRAST,AV_CODEC_ID_INDEO4,AV_CODEC_ID_INDEO5,AV_CODEC_ID_MIMIC,AV_CODEC_ID_RL2,AV_CODEC_ID_ESCAPE124,AV_CODEC_ID_DIRAC,AV_CODEC_ID_BFI,AV_CODEC_ID_CMV,AV_CODEC_ID_MOTIONPIXELS,AV_CODEC_ID_TGV,AV_CODEC_ID_TGQ,AV_CODEC_ID_TQI,AV_CODEC_ID_AURA,AV_CODEC_ID_AURA2,AV_CODEC_ID_V210X,AV_CODEC_ID_TMV,AV_CODEC_ID_V210,AV_CODEC_ID_DPX,AV_CODEC_ID_MAD,AV_CODEC_ID_FRWU,AV_CODEC_ID_FLASHSV2,AV_CODEC_ID_CDGRAPHICS,AV_CODEC_ID_R210,AV_CODEC_ID_ANM,AV_CODEC_ID_BINKVIDEO,AV_CODEC_ID_IFF_ILBM,
#define AV_CODEC_ID_IFF_BYTERUN1 AV_CODEC_ID_IFF_ILBMAV_CODEC_ID_KGV1,AV_CODEC_ID_YOP,AV_CODEC_ID_VP8,AV_CODEC_ID_PICTOR,AV_CODEC_ID_ANSI,AV_CODEC_ID_A64_MULTI,AV_CODEC_ID_A64_MULTI5,AV_CODEC_ID_R10K,AV_CODEC_ID_MXPEG,AV_CODEC_ID_LAGARITH,AV_CODEC_ID_PRORES,AV_CODEC_ID_JV,AV_CODEC_ID_DFA,AV_CODEC_ID_WMV3IMAGE,AV_CODEC_ID_VC1IMAGE,AV_CODEC_ID_UTVIDEO,AV_CODEC_ID_BMV_VIDEO,AV_CODEC_ID_VBLE,AV_CODEC_ID_DXTORY,AV_CODEC_ID_V410,AV_CODEC_ID_XWD,AV_CODEC_ID_CDXL,AV_CODEC_ID_XBM,AV_CODEC_ID_ZEROCODEC,AV_CODEC_ID_MSS1,AV_CODEC_ID_MSA1,AV_CODEC_ID_TSCC2,AV_CODEC_ID_MTS2,AV_CODEC_ID_CLLC,AV_CODEC_ID_MSS2,AV_CODEC_ID_VP9,AV_CODEC_ID_AIC,AV_CODEC_ID_ESCAPE130,AV_CODEC_ID_G2M,AV_CODEC_ID_WEBP,AV_CODEC_ID_HNM4_VIDEO,AV_CODEC_ID_HEVC,
#define AV_CODEC_ID_H265 AV_CODEC_ID_HEVCAV_CODEC_ID_FIC,AV_CODEC_ID_ALIAS_PIX,AV_CODEC_ID_BRENDER_PIX,AV_CODEC_ID_PAF_VIDEO,AV_CODEC_ID_EXR,AV_CODEC_ID_VP7,AV_CODEC_ID_SANM,AV_CODEC_ID_SGIRLE,AV_CODEC_ID_MVC1,AV_CODEC_ID_MVC2,AV_CODEC_ID_HQX,AV_CODEC_ID_TDSC,AV_CODEC_ID_HQ_HQA,AV_CODEC_ID_HAP,AV_CODEC_ID_DDS,AV_CODEC_ID_DXV,AV_CODEC_ID_SCREENPRESSO,AV_CODEC_ID_RSCC,AV_CODEC_ID_AVS2,AV_CODEC_ID_PGX,AV_CODEC_ID_AVS3,AV_CODEC_ID_MSP2,AV_CODEC_ID_VVC,
#define AV_CODEC_ID_H266 AV_CODEC_ID_VVCAV_CODEC_ID_Y41P,AV_CODEC_ID_AVRP,AV_CODEC_ID_012V,AV_CODEC_ID_AVUI,AV_CODEC_ID_AYUV,AV_CODEC_ID_TARGA_Y216,AV_CODEC_ID_V308,AV_CODEC_ID_V408,AV_CODEC_ID_YUV4,AV_CODEC_ID_AVRN,AV_CODEC_ID_CPIA,AV_CODEC_ID_XFACE,AV_CODEC_ID_SNOW,AV_CODEC_ID_SMVJPEG,AV_CODEC_ID_APNG,AV_CODEC_ID_DAALA,AV_CODEC_ID_CFHD,AV_CODEC_ID_TRUEMOTION2RT,AV_CODEC_ID_M101,AV_CODEC_ID_MAGICYUV,AV_CODEC_ID_SHEERVIDEO,AV_CODEC_ID_YLC,AV_CODEC_ID_PSD,AV_CODEC_ID_PIXLET,AV_CODEC_ID_SPEEDHQ,AV_CODEC_ID_FMVC,AV_CODEC_ID_SCPR,AV_CODEC_ID_CLEARVIDEO,AV_CODEC_ID_XPM,AV_CODEC_ID_AV1,AV_CODEC_ID_BITPACKED,AV_CODEC_ID_MSCC,AV_CODEC_ID_SRGC,AV_CODEC_ID_SVG,AV_CODEC_ID_GDV,AV_CODEC_ID_FITS,AV_CODEC_ID_IMM4,AV_CODEC_ID_PROSUMER,AV_CODEC_ID_MWSC,AV_CODEC_ID_WCMV,AV_CODEC_ID_RASC,AV_CODEC_ID_HYMT,AV_CODEC_ID_ARBC,AV_CODEC_ID_AGM,AV_CODEC_ID_LSCR,AV_CODEC_ID_VP4,AV_CODEC_ID_IMM5,AV_CODEC_ID_MVDV,AV_CODEC_ID_MVHA,AV_CODEC_ID_CDTOONS,AV_CODEC_ID_MV30,AV_CODEC_ID_NOTCHLC,AV_CODEC_ID_PFM,AV_CODEC_ID_MOBICLIP,AV_CODEC_ID_PHOTOCD,AV_CODEC_ID_IPU,AV_CODEC_ID_ARGO,AV_CODEC_ID_CRI,AV_CODEC_ID_SIMBIOSIS_IMX,AV_CODEC_ID_SGA_VIDEO,AV_CODEC_ID_GEM,AV_CODEC_ID_VBN,AV_CODEC_ID_JPEGXL,AV_CODEC_ID_QOI,/* various PCM codecs */AV_CODEC_ID_FIRST_AUDIO 0x10000, /// A dummy id pointing at the start of audio codecsAV_CODEC_ID_PCM_S16LE 0x10000,AV_CODEC_ID_PCM_S16BE,AV_CODEC_ID_PCM_U16LE,AV_CODEC_ID_PCM_U16BE,AV_CODEC_ID_PCM_S8,AV_CODEC_ID_PCM_U8,AV_CODEC_ID_PCM_MULAW,AV_CODEC_ID_PCM_ALAW,AV_CODEC_ID_PCM_S32LE,AV_CODEC_ID_PCM_S32BE,AV_CODEC_ID_PCM_U32LE,AV_CODEC_ID_PCM_U32BE,AV_CODEC_ID_PCM_S24LE,AV_CODEC_ID_PCM_S24BE,AV_CODEC_ID_PCM_U24LE,AV_CODEC_ID_PCM_U24BE,AV_CODEC_ID_PCM_S24DAUD,AV_CODEC_ID_PCM_ZORK,AV_CODEC_ID_PCM_S16LE_PLANAR,AV_CODEC_ID_PCM_DVD,AV_CODEC_ID_PCM_F32BE,AV_CODEC_ID_PCM_F32LE,AV_CODEC_ID_PCM_F64BE,AV_CODEC_ID_PCM_F64LE,AV_CODEC_ID_PCM_BLURAY,AV_CODEC_ID_PCM_LXF,AV_CODEC_ID_S302M,AV_CODEC_ID_PCM_S8_PLANAR,AV_CODEC_ID_PCM_S24LE_PLANAR,AV_CODEC_ID_PCM_S32LE_PLANAR,AV_CODEC_ID_PCM_S16BE_PLANAR,AV_CODEC_ID_PCM_S64LE,AV_CODEC_ID_PCM_S64BE,AV_CODEC_ID_PCM_F16LE,AV_CODEC_ID_PCM_F24LE,AV_CODEC_ID_PCM_VIDC,AV_CODEC_ID_PCM_SGA,/* various ADPCM codecs */AV_CODEC_ID_ADPCM_IMA_QT 0x11000,AV_CODEC_ID_ADPCM_IMA_WAV,AV_CODEC_ID_ADPCM_IMA_DK3,AV_CODEC_ID_ADPCM_IMA_DK4,AV_CODEC_ID_ADPCM_IMA_WS,AV_CODEC_ID_ADPCM_IMA_SMJPEG,AV_CODEC_ID_ADPCM_MS,AV_CODEC_ID_ADPCM_4XM,AV_CODEC_ID_ADPCM_XA,AV_CODEC_ID_ADPCM_ADX,AV_CODEC_ID_ADPCM_EA,AV_CODEC_ID_ADPCM_G726,AV_CODEC_ID_ADPCM_CT,AV_CODEC_ID_ADPCM_SWF,AV_CODEC_ID_ADPCM_YAMAHA,AV_CODEC_ID_ADPCM_SBPRO_4,AV_CODEC_ID_ADPCM_SBPRO_3,AV_CODEC_ID_ADPCM_SBPRO_2,AV_CODEC_ID_ADPCM_THP,AV_CODEC_ID_ADPCM_IMA_AMV,AV_CODEC_ID_ADPCM_EA_R1,AV_CODEC_ID_ADPCM_EA_R3,AV_CODEC_ID_ADPCM_EA_R2,AV_CODEC_ID_ADPCM_IMA_EA_SEAD,AV_CODEC_ID_ADPCM_IMA_EA_EACS,AV_CODEC_ID_ADPCM_EA_XAS,AV_CODEC_ID_ADPCM_EA_MAXIS_XA,AV_CODEC_ID_ADPCM_IMA_ISS,AV_CODEC_ID_ADPCM_G722,AV_CODEC_ID_ADPCM_IMA_APC,AV_CODEC_ID_ADPCM_VIMA,AV_CODEC_ID_ADPCM_AFC,AV_CODEC_ID_ADPCM_IMA_OKI,AV_CODEC_ID_ADPCM_DTK,AV_CODEC_ID_ADPCM_IMA_RAD,AV_CODEC_ID_ADPCM_G726LE,AV_CODEC_ID_ADPCM_THP_LE,AV_CODEC_ID_ADPCM_PSX,AV_CODEC_ID_ADPCM_AICA,AV_CODEC_ID_ADPCM_IMA_DAT4,AV_CODEC_ID_ADPCM_MTAF,AV_CODEC_ID_ADPCM_AGM,AV_CODEC_ID_ADPCM_ARGO,AV_CODEC_ID_ADPCM_IMA_SSI,AV_CODEC_ID_ADPCM_ZORK,AV_CODEC_ID_ADPCM_IMA_APM,AV_CODEC_ID_ADPCM_IMA_ALP,AV_CODEC_ID_ADPCM_IMA_MTF,AV_CODEC_ID_ADPCM_IMA_CUNNING,AV_CODEC_ID_ADPCM_IMA_MOFLEX,AV_CODEC_ID_ADPCM_IMA_ACORN,/* AMR */AV_CODEC_ID_AMR_NB 0x12000,AV_CODEC_ID_AMR_WB,/* RealAudio codecs*/AV_CODEC_ID_RA_144 0x13000,AV_CODEC_ID_RA_288,/* various DPCM codecs */AV_CODEC_ID_ROQ_DPCM 0x14000,AV_CODEC_ID_INTERPLAY_DPCM,AV_CODEC_ID_XAN_DPCM,AV_CODEC_ID_SOL_DPCM,AV_CODEC_ID_SDX2_DPCM,AV_CODEC_ID_GREMLIN_DPCM,AV_CODEC_ID_DERF_DPCM,/* audio codecs */AV_CODEC_ID_MP2 0x15000,AV_CODEC_ID_MP3, /// preferred ID for decoding MPEG audio layer 1, 2 or 3AV_CODEC_ID_AAC,AV_CODEC_ID_AC3,AV_CODEC_ID_DTS,AV_CODEC_ID_VORBIS,AV_CODEC_ID_DVAUDIO,AV_CODEC_ID_WMAV1,AV_CODEC_ID_WMAV2,AV_CODEC_ID_MACE3,AV_CODEC_ID_MACE6,AV_CODEC_ID_VMDAUDIO,AV_CODEC_ID_FLAC,AV_CODEC_ID_MP3ADU,AV_CODEC_ID_MP3ON4,AV_CODEC_ID_SHORTEN,AV_CODEC_ID_ALAC,AV_CODEC_ID_WESTWOOD_SND1,AV_CODEC_ID_GSM, /// as in Berlin toast formatAV_CODEC_ID_QDM2,AV_CODEC_ID_COOK,AV_CODEC_ID_TRUESPEECH,AV_CODEC_ID_TTA,AV_CODEC_ID_SMACKAUDIO,AV_CODEC_ID_QCELP,AV_CODEC_ID_WAVPACK,AV_CODEC_ID_DSICINAUDIO,AV_CODEC_ID_IMC,AV_CODEC_ID_MUSEPACK7,AV_CODEC_ID_MLP,AV_CODEC_ID_GSM_MS, /* as found in WAV */AV_CODEC_ID_ATRAC3,AV_CODEC_ID_APE,AV_CODEC_ID_NELLYMOSER,AV_CODEC_ID_MUSEPACK8,AV_CODEC_ID_SPEEX,AV_CODEC_ID_WMAVOICE,AV_CODEC_ID_WMAPRO,AV_CODEC_ID_WMALOSSLESS,AV_CODEC_ID_ATRAC3P,AV_CODEC_ID_EAC3,AV_CODEC_ID_SIPR,AV_CODEC_ID_MP1,AV_CODEC_ID_TWINVQ,AV_CODEC_ID_TRUEHD,AV_CODEC_ID_MP4ALS,AV_CODEC_ID_ATRAC1,AV_CODEC_ID_BINKAUDIO_RDFT,AV_CODEC_ID_BINKAUDIO_DCT,AV_CODEC_ID_AAC_LATM,AV_CODEC_ID_QDMC,AV_CODEC_ID_CELT,AV_CODEC_ID_G723_1,AV_CODEC_ID_G729,AV_CODEC_ID_8SVX_EXP,AV_CODEC_ID_8SVX_FIB,AV_CODEC_ID_BMV_AUDIO,AV_CODEC_ID_RALF,AV_CODEC_ID_IAC,AV_CODEC_ID_ILBC,AV_CODEC_ID_OPUS,AV_CODEC_ID_COMFORT_NOISE,AV_CODEC_ID_TAK,AV_CODEC_ID_METASOUND,AV_CODEC_ID_PAF_AUDIO,AV_CODEC_ID_ON2AVC,AV_CODEC_ID_DSS_SP,AV_CODEC_ID_CODEC2,AV_CODEC_ID_FFWAVESYNTH,AV_CODEC_ID_SONIC,AV_CODEC_ID_SONIC_LS,AV_CODEC_ID_EVRC,AV_CODEC_ID_SMV,AV_CODEC_ID_DSD_LSBF,AV_CODEC_ID_DSD_MSBF,AV_CODEC_ID_DSD_LSBF_PLANAR,AV_CODEC_ID_DSD_MSBF_PLANAR,AV_CODEC_ID_4GV,AV_CODEC_ID_INTERPLAY_ACM,AV_CODEC_ID_XMA1,AV_CODEC_ID_XMA2,AV_CODEC_ID_DST,AV_CODEC_ID_ATRAC3AL,AV_CODEC_ID_ATRAC3PAL,AV_CODEC_ID_DOLBY_E,AV_CODEC_ID_APTX,AV_CODEC_ID_APTX_HD,AV_CODEC_ID_SBC,AV_CODEC_ID_ATRAC9,AV_CODEC_ID_HCOM,AV_CODEC_ID_ACELP_KELVIN,AV_CODEC_ID_MPEGH_3D_AUDIO,AV_CODEC_ID_SIREN,AV_CODEC_ID_HCA,AV_CODEC_ID_FASTAUDIO,AV_CODEC_ID_MSNSIREN,AV_CODEC_ID_DFPWM,/* subtitle codecs */AV_CODEC_ID_FIRST_SUBTITLE 0x17000, /// A dummy ID pointing at the start of subtitle codecs.AV_CODEC_ID_DVD_SUBTITLE 0x17000,AV_CODEC_ID_DVB_SUBTITLE,AV_CODEC_ID_TEXT, /// raw UTF-8 textAV_CODEC_ID_XSUB,AV_CODEC_ID_SSA,AV_CODEC_ID_MOV_TEXT,AV_CODEC_ID_HDMV_PGS_SUBTITLE,AV_CODEC_ID_DVB_TELETEXT,AV_CODEC_ID_SRT,AV_CODEC_ID_MICRODVD,AV_CODEC_ID_EIA_608,AV_CODEC_ID_JACOSUB,AV_CODEC_ID_SAMI,AV_CODEC_ID_REALTEXT,AV_CODEC_ID_STL,AV_CODEC_ID_SUBVIEWER1,AV_CODEC_ID_SUBVIEWER,AV_CODEC_ID_SUBRIP,AV_CODEC_ID_WEBVTT,AV_CODEC_ID_MPL2,AV_CODEC_ID_VPLAYER,AV_CODEC_ID_PJS,AV_CODEC_ID_ASS,AV_CODEC_ID_HDMV_TEXT_SUBTITLE,AV_CODEC_ID_TTML,AV_CODEC_ID_ARIB_CAPTION,/* other specific kind of codecs (generally used for attachments) */AV_CODEC_ID_FIRST_UNKNOWN 0x18000, /// A dummy ID pointing at the start of various fake codecs.AV_CODEC_ID_TTF 0x18000,AV_CODEC_ID_SCTE_35, /// Contain timestamp estimated through PCR of program stream.AV_CODEC_ID_EPG,AV_CODEC_ID_BINTEXT,AV_CODEC_ID_XBIN,AV_CODEC_ID_IDF,AV_CODEC_ID_OTF,AV_CODEC_ID_SMPTE_KLV,AV_CODEC_ID_DVD_NAV,AV_CODEC_ID_TIMED_ID3,AV_CODEC_ID_BIN_DATA,AV_CODEC_ID_PROBE 0x19000, /// codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify itAV_CODEC_ID_MPEG2TS 0x20000, /** _FAKE_ codec to indicate a raw MPEG-2 TS* stream (only used by libavformat) */AV_CODEC_ID_MPEG4SYSTEMS 0x20001, /** _FAKE_ codec to indicate a MPEG-4 Systems* stream (only used by libavformat) */AV_CODEC_ID_FFMETADATA 0x21000, /// Dummy codec for streams containing only metadata information.AV_CODEC_ID_WRAPPED_AVFRAME 0x21001, /// Passthrough codec, AVFrames wrapped in AVPacket
};
AVCodecID 位于 codec_id.h文件内
/*** Identify the syntax and semantics of the bitstream.* The principle is roughly:* Two decoders with the same ID can decode the same streams.* Two encoders with the same ID can encode compatible streams.* There may be slight deviations from the principle due to implementation* details.** If you add a codec ID to this list, add it so that* 1. no value of an existing codec ID changes (that would break ABI),* 2. it is as close as possible to similar codecs** After adding new codec IDs, do not forget to add an entry to the codec* descriptor list and bump libavcodec minor version.*/
enum AVCodecID {AV_CODEC_ID_NONE,/* video codecs */AV_CODEC_ID_MPEG1VIDEO,AV_CODEC_ID_MPEG2VIDEO, /// preferred ID for MPEG-1/2 video decodingAV_CODEC_ID_H261,AV_CODEC_ID_H263,AV_CODEC_ID_RV10,AV_CODEC_ID_RV20,AV_CODEC_ID_MJPEG,AV_CODEC_ID_MJPEGB,AV_CODEC_ID_LJPEG,AV_CODEC_ID_SP5X,AV_CODEC_ID_JPEGLS,AV_CODEC_ID_MPEG4,AV_CODEC_ID_RAWVIDEO,AV_CODEC_ID_MSMPEG4V1,AV_CODEC_ID_MSMPEG4V2,AV_CODEC_ID_MSMPEG4V3,AV_CODEC_ID_WMV1,AV_CODEC_ID_WMV2,AV_CODEC_ID_H263P,AV_CODEC_ID_H263I,AV_CODEC_ID_FLV1,AV_CODEC_ID_SVQ1,AV_CODEC_ID_SVQ3,AV_CODEC_ID_DVVIDEO,AV_CODEC_ID_HUFFYUV,AV_CODEC_ID_CYUV,AV_CODEC_ID_H264,AV_CODEC_ID_INDEO3,AV_CODEC_ID_VP3,AV_CODEC_ID_THEORA,AV_CODEC_ID_ASV1,AV_CODEC_ID_ASV2,AV_CODEC_ID_FFV1,AV_CODEC_ID_4XM,AV_CODEC_ID_VCR1,AV_CODEC_ID_CLJR,AV_CODEC_ID_MDEC,AV_CODEC_ID_ROQ,AV_CODEC_ID_INTERPLAY_VIDEO,AV_CODEC_ID_XAN_WC3,AV_CODEC_ID_XAN_WC4,AV_CODEC_ID_RPZA,AV_CODEC_ID_CINEPAK,AV_CODEC_ID_WS_VQA,AV_CODEC_ID_MSRLE,AV_CODEC_ID_MSVIDEO1,AV_CODEC_ID_IDCIN,AV_CODEC_ID_8BPS,AV_CODEC_ID_SMC,
此处省略 几百行
}
AVPixelFormat位于pixfmt.h文件内
/*** Pixel format.** note* AV_PIX_FMT_RGB32 is handled in an endian-specific manner. An RGBA* color is put together as:* (A 24) | (R 16) | (G 8) | B* This is stored as BGRA on little-endian CPU architectures and ARGB on* big-endian CPUs.** note* If the resolution is not a multiple of the chroma subsampling factor* then the chroma plane resolution must be rounded up.** par* When the pixel format is palettized RGB32 (AV_PIX_FMT_PAL8), the palettized* image data is stored in AVFrame.data[0]. The palette is transported in* AVFrame.data[1], is 1024 bytes long (256 4-byte entries) and is* formatted the same as in AV_PIX_FMT_RGB32 described above (i.e., it is* also endian-specific). Note also that the individual RGB32 palette* components stored in AVFrame.data[1] should be in the range 0..255.* This is important as many custom PAL8 video codecs that were designed* to run on the IBM VGA graphics adapter use 6-bit palette components.** par* For all the 8 bits per pixel formats, an RGB32 palette is in data[1] like* for pal8. This palette is filled in automatically by the function* allocating the picture.*/
enum AVPixelFormat {AV_PIX_FMT_NONE -1,AV_PIX_FMT_YUV420P, /// planar YUV 4:2:0, 12bpp, (1 Cr Cb sample per 2x2 Y samples)AV_PIX_FMT_YUYV422, /// packed YUV 4:2:2, 16bpp, Y0 Cb Y1 CrAV_PIX_FMT_RGB24, /// packed RGB 8:8:8, 24bpp, RGBRGB...AV_PIX_FMT_BGR24, /// packed RGB 8:8:8, 24bpp, BGRBGR...AV_PIX_FMT_YUV422P, /// planar YUV 4:2:2, 16bpp, (1 Cr Cb sample per 2x1 Y samples)AV_PIX_FMT_YUV444P, /// planar YUV 4:4:4, 24bpp, (1 Cr Cb sample per 1x1 Y samples)AV_PIX_FMT_YUV410P, /// planar YUV 4:1:0, 9bpp, (1 Cr Cb sample per 4x4 Y samples)AV_PIX_FMT_YUV411P, /// planar YUV 4:1:1, 12bpp, (1 Cr Cb sample per 4x1 Y samples)AV_PIX_FMT_GRAY8, /// Y , 8bppAV_PIX_FMT_MONOWHITE, /// Y , 1bpp, 0 is white, 1 is black, in each byte pixels are ordered from the msb to the lsbAV_PIX_FMT_MONOBLACK, /// Y , 1bpp, 0 is black, 1 is white, in each byte pixels are ordered from the msb to the lsbAV_PIX_FMT_PAL8, /// 8 bits with AV_PIX_FMT_RGB32 paletteAV_PIX_FMT_YUVJ420P, /// planar YUV 4:2:0, 12bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV420P and setting color_rangeAV_PIX_FMT_YUVJ422P, /// planar YUV 4:2:2, 16bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV422P and setting color_rangeAV_PIX_FMT_YUVJ444P, /// planar YUV 4:4:4, 24bpp, full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV444P and setting color_rangeAV_PIX_FMT_UYVY422, /// packed YUV 4:2:2, 16bpp, Cb Y0 Cr Y1AV_PIX_FMT_UYYVYY411, /// packed YUV 4:1:1, 12bpp, Cb Y0 Y1 Cr Y2 Y3AV_PIX_FMT_BGR8, /// packed RGB 3:3:2, 8bpp, (msb)2B 3G 3R(lsb)AV_PIX_FMT_BGR4, /// packed RGB 1:2:1 bitstream, 4bpp, (msb)1B 2G 1R(lsb), a byte contains two pixels, the first pixel in the byte is the one composed by the 4 msb bitsAV_PIX_FMT_BGR4_BYTE, /// packed RGB 1:2:1, 8bpp, (msb)1B 2G 1R(lsb)AV_PIX_FMT_RGB8, /// packed RGB 3:3:2, 8bpp, (msb)2R 3G 3B(lsb)AV_PIX_FMT_RGB4, /// packed RGB 1:2:1 bitstream, 4bpp, (msb)1R 2G 1B(lsb), a byte contains two pixels, the first pixel in the byte is the one composed by the 4 msb bitsAV_PIX_FMT_RGB4_BYTE, /// packed RGB 1:2:1, 8bpp, (msb)1R 2G 1B(lsb)AV_PIX_FMT_NV12, /// planar YUV 4:2:0, 12bpp, 1 plane for Y and 1 plane for the UV components, which are interleaved (first byte U and the following byte V)AV_PIX_FMT_NV21, /// as above, but U and V bytes are swappedAV_PIX_FMT_ARGB, /// packed ARGB 8:8:8:8, 32bpp, ARGBARGB...AV_PIX_FMT_RGBA, /// packed RGBA 8:8:8:8, 32bpp, RGBARGBA...AV_PIX_FMT_ABGR, /// packed ABGR 8:8:8:8, 32bpp, ABGRABGR...AV_PIX_FMT_BGRA, /// packed BGRA 8:8:8:8, 32bpp, BGRABGRA...AV_PIX_FMT_GRAY16BE, /// Y , 16bpp, big-endianAV_PIX_FMT_GRAY16LE, /// Y , 16bpp, little-endianAV_PIX_FMT_YUV440P, /// planar YUV 4:4:0 (1 Cr Cb sample per 1x2 Y samples)AV_PIX_FMT_YUVJ440P, /// planar YUV 4:4:0 full scale (JPEG), deprecated in favor of AV_PIX_FMT_YUV440P and setting color_rangeAV_PIX_FMT_YUVA420P, /// planar YUV 4:2:0, 20bpp, (1 Cr Cb sample per 2x2 Y A samples)AV_PIX_FMT_RGB48BE, /// packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, the 2-byte value for each R/G/B component is stored as big-endianAV_PIX_FMT_RGB48LE, /// packed RGB 16:16:16, 48bpp, 16R, 16G, 16B, the 2-byte value for each R/G/B component is stored as little-endianAV_PIX_FMT_RGB565BE, /// packed RGB 5:6:5, 16bpp, (msb) 5R 6G 5B(lsb), big-endianAV_PIX_FMT_RGB565LE, /// packed RGB 5:6:5, 16bpp, (msb) 5R 6G 5B(lsb), little-endianAV_PIX_FMT_RGB555BE, /// packed RGB 5:5:5, 16bpp, (msb)1X 5R 5G 5B(lsb), big-endian , Xunused/undefinedAV_PIX_FMT_RGB555LE, /// packed RGB 5:5:5, 16bpp, (msb)1X 5R 5G 5B(lsb), little-endian, Xunused/undefinedAV_PIX_FMT_BGR565BE, /// packed BGR 5:6:5, 16bpp, (msb) 5B 6G 5R(lsb), big-endianAV_PIX_FMT_BGR565LE, /// packed BGR 5:6:5, 16bpp, (msb) 5B 6G 5R(lsb), little-endianAV_PIX_FMT_BGR555BE, /// packed BGR 5:5:5, 16bpp, (msb)1X 5B 5G 5R(lsb), big-endian , Xunused/undefinedAV_PIX_FMT_BGR555LE, /// packed BGR 5:5:5, 16bpp, (msb)1X 5B 5G 5R(lsb), little-endian, Xunused/undefined/*** Hardware acceleration through VA-API, data[3] contains a* VASurfaceID.*/AV_PIX_FMT_VAAPI,AV_PIX_FMT_YUV420P16LE, /// planar YUV 4:2:0, 24bpp, (1 Cr Cb sample per 2x2 Y samples), little-endianAV_PIX_FMT_YUV420P16BE, /// planar YUV 4:2:0, 24bpp, (1 Cr Cb sample per 2x2 Y samples), big-endianAV_PIX_FMT_YUV422P16LE, /// planar YUV 4:2:2, 32bpp, (1 Cr Cb sample per 2x1 Y samples), little-endianAV_PIX_FMT_YUV422P16BE, /// planar YUV 4:2:2, 32bpp, (1 Cr Cb sample per 2x1 Y samples), big-endianAV_PIX_FMT_YUV444P16LE, /// planar YUV 4:4:4, 48bpp, (1 Cr Cb sample per 1x1 Y samples), little-endianAV_PIX_FMT_YUV444P16BE, /// planar YUV 4:4:4, 48bpp, (1 Cr Cb sample per 1x1 Y samples), big-endianAV_PIX_FMT_DXVA2_VLD, /// HW decoding through DXVA2, Picture.data[3] contains a LPDIRECT3DSURFACE9 pointerAV_PIX_FMT_RGB444LE, /// packed RGB 4:4:4, 16bpp, (msb)4X 4R 4G 4B(lsb), little-endian, Xunused/undefinedAV_PIX_FMT_RGB444BE, /// packed RGB 4:4:4, 16bpp, (msb)4X 4R 4G 4B(lsb), big-endian, Xunused/undefinedAV_PIX_FMT_BGR444LE, /// packed BGR 4:4:4, 16bpp, (msb)4X 4B 4G 4R(lsb), little-endian, Xunused/undefinedAV_PIX_FMT_BGR444BE, /// packed BGR 4:4:4, 16bpp, (msb)4X 4B 4G 4R(lsb), big-endian, Xunused/undefinedAV_PIX_FMT_YA8, /// 8 bits gray, 8 bits alphaAV_PIX_FMT_Y400A AV_PIX_FMT_YA8, /// alias for AV_PIX_FMT_YA8AV_PIX_FMT_GRAY8A AV_PIX_FMT_YA8, /// alias for AV_PIX_FMT_YA8
此处省略 几百行} AVSampleFormat 位于samplefmt.h文件中
/*** Audio sample formats** - The data described by the sample format is always in native-endian order.* Sample values can be expressed by native C types, hence the lack of a signed* 24-bit sample format even though it is a common raw audio data format.** - The floating-point formats are based on full volume being in the range* [-1.0, 1.0]. Any values outside this range are beyond full volume level.** - The data layout as used in av_samples_fill_arrays() and elsewhere in FFmpeg* (such as AVFrame in libavcodec) is as follows:** par* For planar sample formats, each audio channel is in a separate data plane,* and linesize is the buffer size, in bytes, for a single plane. All data* planes must be the same size. For packed sample formats, only the first data* plane is used, and samples for each channel are interleaved. In this case,* linesize is the buffer size, in bytes, for the 1 plane.**/
enum AVSampleFormat {AV_SAMPLE_FMT_NONE -1,AV_SAMPLE_FMT_U8, /// unsigned 8 bitsAV_SAMPLE_FMT_S16, /// signed 16 bitsAV_SAMPLE_FMT_S32, /// signed 32 bitsAV_SAMPLE_FMT_FLT, /// floatAV_SAMPLE_FMT_DBL, /// doubleAV_SAMPLE_FMT_U8P, /// unsigned 8 bits, planarAV_SAMPLE_FMT_S16P, /// signed 16 bits, planarAV_SAMPLE_FMT_S32P, /// signed 32 bits, planarAV_SAMPLE_FMT_FLTP, /// float, planarAV_SAMPLE_FMT_DBLP, /// double, planarAV_SAMPLE_FMT_S64, /// signed 64 bitsAV_SAMPLE_FMT_S64P, /// signed 64 bits, planarAV_SAMPLE_FMT_NB /// Number of sample formats. DO NOT USE if linking dynamically
};每一个编解码器对应一个结构体H.264解码器的结构体如下所示h264dec.c
const FFCodec ff_h264_decoder {.p.name h264,.p.long_name NULL_IF_CONFIG_SMALL(H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10),.p.type AVMEDIA_TYPE_VIDEO,.p.id AV_CODEC_ID_H264,.priv_data_size sizeof(H264Context),.init h264_decode_init,.close h264_decode_end,FF_CODEC_DECODE_CB(h264_decode_frame),.p.capabilities /*AV_CODEC_CAP_DRAW_HORIZ_BAND |*/ AV_CODEC_CAP_DR1 |AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS |AV_CODEC_CAP_FRAME_THREADS,.hw_configs (const AVCodecHWConfigInternal *const []) {
#if CONFIG_H264_DXVA2_HWACCELHWACCEL_DXVA2(h264),
#endif
#if CONFIG_H264_D3D11VA_HWACCELHWACCEL_D3D11VA(h264),
#endif
#if CONFIG_H264_D3D11VA2_HWACCELHWACCEL_D3D11VA2(h264),
#endif
#if CONFIG_H264_NVDEC_HWACCELHWACCEL_NVDEC(h264),
#endif
#if CONFIG_H264_VAAPI_HWACCELHWACCEL_VAAPI(h264),
#endif
#if CONFIG_H264_VDPAU_HWACCELHWACCEL_VDPAU(h264),
#endif
#if CONFIG_H264_VIDEOTOOLBOX_HWACCELHWACCEL_VIDEOTOOLBOX(h264),
#endifNULL},.caps_internal FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_EXPORTS_CROPPING |FF_CODEC_CAP_ALLOCATE_PROGRESS | FF_CODEC_CAP_INIT_CLEANUP,.flush h264_decode_flush,.update_thread_context ONLY_IF_THREADS_ENABLED(ff_h264_update_thread_context),.update_thread_context_for_user ONLY_IF_THREADS_ENABLED(ff_h264_update_thread_context_for_user),.p.profiles NULL_IF_CONFIG_SMALL(ff_h264_profiles),.p.priv_class h264_class,
};JPEG2000解码器结构体位于jpeg2000dec.c
const FFCodec ff_jpeg2000_decoder {.p.name jpeg2000,.p.long_name NULL_IF_CONFIG_SMALL(JPEG 2000),.p.type AVMEDIA_TYPE_VIDEO,.p.id AV_CODEC_ID_JPEG2000,.p.capabilities AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_DR1,.priv_data_size sizeof(Jpeg2000DecoderContext),.init jpeg2000_decode_init,FF_CODEC_DECODE_CB(jpeg2000_decode_frame),.p.priv_class jpeg2000_class,.p.max_lowres 5,.p.profiles NULL_IF_CONFIG_SMALL(ff_jpeg2000_profiles),.caps_internal FF_CODEC_CAP_INIT_THREADSAFE,
};以下内容最新版 已经删除
下面简单介绍一下遍历ffmpeg中的解码器信息的方法这些解码器以一个链表的形式存储
1.注册所有编解码器av_register_all();
2.声明一个AVCodec类型的指针比如说AVCodec* first_c;
3.调用av_codec_next()函数即可获得指向链表下一个解码器的指针循环往复可以获得所有解码器的信息。注意如果想要获得指向第一个解码器的指针则需要将该函数的参数设置为NULL。
代码
typedef struct AVCodec {/*** Name of the codec implementation. //编解码器实现的名称* The name is globally unique among encoders and among decoders (but an* encoder and a decoder can share the same name). * //名称在编码器和解码器之间是全局唯一的但编码器和解码器可以共享相同的名称* This is the primary way to find a codec from the user perspective.* //这是从用户角度查找编解码器的主要方式*/const char *name;/*** Descriptive name for the codec, meant to be more human readable than name.//编解码器的描述性名称意味着比名称更易于阅读* You should use the NULL_IF_CONFIG_SMALL() macro to define it. //您应该使用 NULL_IF_CONFIG_SMALL() 宏来定义它*/const char *long_name;enum AVMediaType type;enum AVCodecID id;/*** Codec capabilities. //编解码器功能* see AV_CODEC_CAP_**/int capabilities;uint8_t max_lowres; /// maximum value for lowres supported by the decoder //解码器支持的低分辨率最大值const AVRational *supported_framerates; /// array of supported framerates, or NULL if any, array is terminated by {0,0} //支持的帧率数组如果有则为 NULL数组由 {0,0} 终止const enum AVPixelFormat *pix_fmts; /// array of supported pixel formats, or NULL if unknown, array is terminated by -1 //支持的像素格式数组如果未知则为 NULL数组由 -1 终止const int *supported_samplerates; /// array of supported audio samplerates, or NULL if unknown, array is terminated by 0 //支持的音频采样率数组如果未知则为 NULL数组以 0 终止const enum AVSampleFormat *sample_fmts; /// array of supported sample formats, or NULL if unknown, array is terminated by -1 //支持的样本格式数组如果未知则为 NULL数组以 -1 终止
#if FF_API_OLD_CHANNEL_LAYOUT/*** deprecated use ch_layouts instead //改用 ch_layouts*/attribute_deprecatedconst uint64_t *channel_layouts; /// array of support channel layouts, or NULL if unknown. array is terminated by 0 //支持通道布局的数组如果未知则为 NULL。 数组以 0 结束
#endifconst AVClass *priv_class; /// AVClass for the private context //私有上下文的 AVClassconst AVProfile *profiles; /// array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}///已识别配置文件的数组如果未知则为 NULL数组由 {FF_PROFILE_UNKNOWN} 终止/*** Group name of the codec implementation. //编解码器实现的组名* This is a short symbolic name of the wrapper backing this codec. A* wrapper uses some kind of external implementation for the codec, such* as an external library, or a codec implementation provided by the OS or* the hardware.* 这是支持此编解码器的包装器的简短符号名称。包装器为编解码器使用某种外部实现* 例如外部库或者由操作系统或硬件提供的编解码器实现 ** If this field is NULL, this is a builtin, libavcodec native codec.* If non-NULL, this will be the suffix in AVCodec.name in most cases* (usually AVCodec.name will be of the form codec_name_wrapper_name).* 如果此字段为 NULL则这是一个内置的 libavcodec 本机编解码器* 如果非 NULL在大多数情况下这将是 AVCodec.name 中的后缀通常 AVCodec.name * 的格式为“codec_name_wrapper_name”*/const char *wrapper_name;/*** Array of supported channel layouts, terminated with a zeroed layout.* 支持的通道布局数组以归零布局终止*/const AVChannelLayout *ch_layouts;
} AVCodec;
