C++ NULL_IF_CONFIG_SMALL函数代码示例

static const AVFilterPad avfilter_vf_boxblur_inputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .config_props = config_input,
        .draw_slice   = draw_slice,
        .min_perms    = AV_PERM_READ
    },
    { NULL }
};

static const AVFilterPad avfilter_vf_boxblur_outputs[] = {
    {
        .name = "default",
        .type = AVMEDIA_TYPE_VIDEO,
    },
    { NULL }
};

AVFilter avfilter_vf_boxblur = {
    .name          = "boxblur",
    .description   = NULL_IF_CONFIG_SMALL("Blur the input."),
    .priv_size     = sizeof(BoxBlurContext),
    .init          = init,
    .uninit        = uninit,
    .query_formats = query_formats,

    .inputs    = avfilter_vf_boxblur_inputs,
    .outputs   = avfilter_vf_boxblur_outputs,
};

    avctx->coded_frame->key_frame = 1;
    if(!avctx->codec_tag)
        avctx->codec_tag = avcodec_pix_fmt_to_codec_tag(avctx->pix_fmt);
    return 0;
}

static int raw_encode(AVCodecContext *avctx,
                            unsigned char *frame, int buf_size, void *data)
{
    int ret = avpicture_layout((AVPicture *)data, avctx->pix_fmt, avctx->width,
                                               avctx->height, frame, buf_size);

    if(avctx->codec_tag == AV_RL32("yuv2") && ret > 0 &&
       avctx->pix_fmt   == PIX_FMT_YUYV422) {
        int x;
        for(x = 1; x < avctx->height*avctx->width*2; x += 2)
            frame[x] ^= 0x80;
    }
    return ret;
}

AVCodec rawvideo_encoder = {
    "rawvideo",
    CODEC_TYPE_VIDEO,
    CODEC_ID_RAWVIDEO,
    sizeof(AVFrame),
    raw_init_encoder,
    raw_encode,
    .long_name = NULL_IF_CONFIG_SMALL("raw video"),
};

    ctx->slice_count = av_clip(avctx->thread_count, 1,
                               avctx->coded_height / TEXTURE_BLOCK_H);

    return 0;
}

static av_cold int hap_close(AVCodecContext *avctx)
{
    HapContext *ctx = avctx->priv_data;

    ff_hap_free_context(ctx);

    return 0;
}

AVCodec ff_hap_decoder = {
    .name           = "hap",
    .long_name      = NULL_IF_CONFIG_SMALL("Vidvox Hap decoder"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_HAP,
    .init           = hap_init,
    .decode         = hap_decode,
    .close          = hap_close,
    .priv_data_size = sizeof(HapContext),
    .capabilities   = AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_SLICE_THREADS |
                      AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |
                      FF_CODEC_CAP_INIT_CLEANUP,
};

                break;
        }
    }

    *data_size=sizeof(AVFrame);
    *(AVFrame*)data= *avctx->coded_frame;

    return avpkt->size;
}

static av_cold int decode_close(AVCodecContext *avctx)
{
    AVFrame *pic = avctx->coded_frame;
    if (pic->data[0])
        avctx->release_buffer(avctx, pic);
    av_freep(&avctx->coded_frame);

    return 0;
}

AVCodec ff_v210x_decoder = {
    .name           = "v210x",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_V210X,
    .init           = decode_init,
    .close          = decode_close,
    .decode         = decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name      = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
};

            avio_w8(pb, (ico->images[i].bits >= 8) ? 0 : 1 << ico->images[i].bits);
        } else {
            avio_w8(pb, 0);
        }

        avio_w8(pb, 0); // reserved
        avio_wl16(pb, 1); // color planes
        avio_wl16(pb, ico->images[i].bits);
        avio_wl32(pb, ico->images[i].size);
        avio_wl32(pb, ico->images[i].offset);
    }

    av_freep(&ico->images);

    return 0;
}

AVOutputFormat ff_ico_muxer = {
    .name           = "ico",
    .long_name      = NULL_IF_CONFIG_SMALL("Microsoft Windows ICO"),
    .priv_data_size = sizeof(IcoMuxContext),
    .mime_type      = "image/vnd.microsoft.icon",
    .extensions     = "ico",
    .audio_codec    = CODEC_ID_NONE,
    .video_codec    = CODEC_ID_BMP,
    .write_header   = ico_write_header,
    .write_packet   = ico_write_packet,
    .write_trailer  = ico_write_trailer,
    .flags          = AVFMT_NOTIMESTAMPS,
};

        ret = av_new_packet(pkt, 8 * codec->channels);
        if (ret < 0)
            return ret;
        for (i = 0; i < 8 / c->interleave_size; i++) {
            for (ch = 0; ch < codec->channels; ch++) {
                pkt->data[ch * 8 + i*c->interleave_size+0] = avio_r8(s->pb);
                pkt->data[ch * 8 + i*c->interleave_size+1] = avio_r8(s->pb);
            }
        }
        ret = 0;
    } else if (codec->codec_id == AV_CODEC_ID_SDX2_DPCM) {
        ret = av_get_packet(s->pb, pkt, codec->block_align * 1024);

    } else {
        ret = av_get_packet(s->pb, pkt, codec->block_align ? codec->block_align : 1024 * codec->channels);
    }

    pkt->stream_index = 0;
    return ret;
}

AVInputFormat ff_genh_demuxer = {
    .name           = "genh",
    .long_name      = NULL_IF_CONFIG_SMALL("GENeric Header"),
    .priv_data_size = sizeof(GENHDemuxContext),
    .read_probe     = genh_probe,
    .read_header    = genh_read_header,
    .read_packet    = genh_read_packet,
    .extensions     = "genh",
};

    },{
        .name         = "reference",
        .type         = AVMEDIA_TYPE_VIDEO,
        .filter_frame = filter_frame,
        .config_props = config_input_ref,
    },
    { NULL }
};

static const AVFilterPad psnr_outputs[] = {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_VIDEO,
        .config_props  = config_output,
        .request_frame = request_frame,
    },
    { NULL }
};

AVFilter ff_vf_psnr = {
    .name          = "psnr",
    .description   = NULL_IF_CONFIG_SMALL("Calculate the PSNR between two video streams."),
    .init          = init,
    .uninit        = uninit,
    .query_formats = query_formats,
    .priv_size     = sizeof(PSNRContext),
    .priv_class    = &psnr_class,
    .inputs        = psnr_inputs,
    .outputs       = psnr_outputs,
};

    return size;
}

static int mpjpeg_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    int ret;
    int size = parse_multipart_header(s);

    if (size < 0)
        return size;

    ret = av_get_packet(s->pb, pkt, size);
    if (ret < 0)
        return ret;

    // trailing empty line
    avio_skip(s->pb, 2);

    return 0;
}

AVInputFormat ff_mpjpeg_demuxer = {
    .name              = "mpjpeg",
    .long_name         = NULL_IF_CONFIG_SMALL("MIME multipart JPEG"),
    .mime_type         = "multipart/x-mixed-replace",
    .extensions        = "mjpg",
    .read_probe        = mpjpeg_read_probe,
    .read_header       = mpjpeg_read_header,
    .read_packet       = mpjpeg_read_packet,
};

    c->height = 0;
    c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
    if (avctx->extradata_size)
        get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
    dsputil_init(&c->dsp, avctx);
    if (!codec_reinit(avctx, avctx->width, avctx->height, -1))
        return 1;
    return 0;
}

static av_cold int decode_end(AVCodecContext *avctx) {
    NuvContext *c = avctx->priv_data;
    av_freep(&c->decomp_buf);
    if (c->pic.data[0])
        avctx->release_buffer(avctx, &c->pic);
    return 0;
}

AVCodec ff_nuv_decoder = {
    .name           = "nuv",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_NUV,
    .priv_data_size = sizeof(NuvContext),
    .init           = decode_init,
    .close          = decode_end,
    .decode         = decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
};

        case AVMEDIA_TYPE_AUDIO:
            audio_frame_cksum(&bp, *frame);
            break;
    }

    av_bprint_chars(&bp, '\n', 1);
    if (av_bprint_is_complete(&bp))
        avio_write(s->pb, bp.str, bp.len);
    else
        ret = AVERROR(ENOMEM);
    av_bprint_finalize(&bp, NULL);
    return ret;
}

static int write_packet(struct AVFormatContext *s, AVPacket *pkt)
{
    return AVERROR(ENOSYS);
}

AVOutputFormat ff_uncodedframecrc_muxer = {
    .name              = "uncodedframecrc",
    .long_name         = NULL_IF_CONFIG_SMALL("uncoded framecrc testing"),
    .audio_codec       = AV_CODEC_ID_PCM_S16LE,
    .video_codec       = AV_CODEC_ID_RAWVIDEO,
    .write_header      = ff_framehash_write_header,
    .write_packet      = write_packet,
    .write_uncoded_frame = write_frame,
    .flags             = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT |
                         AVFMT_TS_NEGATIVE,
};

            if ((fps=s->streams[n]->avg_frame_rate.num) > 255) {
                av_log(s, AV_LOG_ERROR, "Frame rate may not exceed 255fps\n");
                return AVERROR(EINVAL);
            }

            if (fps != 30) {
                av_log(s, AV_LOG_WARNING, "For vintage compatibility fps must be 30\n");
            }

            header[6] = fps;
            break;
        }
    }

    avio_write(s->pb, header, 8);
    avio_flush(s->pb);

    return 0;
}

AVOutputFormat ff_roq_muxer = {
    .name         = "roq",
    .long_name    = NULL_IF_CONFIG_SMALL("raw id RoQ"),
    .extensions   = "roq",
    .audio_codec  = AV_CODEC_ID_ROQ_DPCM,
    .video_codec  = AV_CODEC_ID_ROQ,
    .write_header = roq_write_header,
    .write_packet = ff_raw_write_packet,
};

static av_cold int libopenjpeg_encode_close(AVCodecContext *avctx)
{
    LibOpenJPEGContext *ctx = avctx->priv_data;

    opj_destroy_compress(ctx->compress);
    opj_image_destroy(ctx->image);
    av_freep(&avctx->coded_frame);
    return 0 ;
}


AVCodec ff_libopenjpeg_encoder = {
    .name           = "libopenjpeg",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_JPEG2000,
    .priv_data_size = sizeof(LibOpenJPEGContext),
    .init           = libopenjpeg_encode_init,
    .encode         = libopenjpeg_encode_frame,
    .close          = libopenjpeg_encode_close,
    .decode         = NULL,
    .capabilities   = 0,
    .pix_fmts = (const enum PixelFormat[]){PIX_FMT_RGB24,PIX_FMT_RGBA,PIX_FMT_GRAY8,
                                           PIX_FMT_YUV420P,PIX_FMT_YUV422P,
                                           PIX_FMT_YUV440P,PIX_FMT_YUV444P,
                                           PIX_FMT_YUV420P9,PIX_FMT_YUV422P9,PIX_FMT_YUV444P9,
                                           PIX_FMT_YUV420P10,PIX_FMT_YUV422P10,PIX_FMT_YUV444P10,
                                           PIX_FMT_YUV420P16,PIX_FMT_YUV422P16,PIX_FMT_YUV444P16},
    .long_name = NULL_IF_CONFIG_SMALL("OpenJPEG based JPEG 2000 encoder"),
} ;

    avio_write(pb, data ? data : pkt->data, size);

    avio_wb32(pb,size+flags_size+11); // previous tag size
    flv->duration = FFMAX(flv->duration, pkt->pts + flv->delay + pkt->duration);

    avio_flush(pb);

    av_free(data);

    return pb->error;
}

AVOutputFormat ff_flv_muxer = {
    .name           = "flv",
    .long_name      = NULL_IF_CONFIG_SMALL("FLV format"),
    .mime_type      = "video/x-flv",
    .extensions     = "flv",
    .priv_data_size = sizeof(FLVContext),
#if CONFIG_LIBMP3LAME
    .audio_codec    = CODEC_ID_MP3,
#else // CONFIG_LIBMP3LAME
    .audio_codec    = CODEC_ID_ADPCM_SWF,
#endif // CONFIG_LIBMP3LAME
    .video_codec    = CODEC_ID_FLV1,
    .write_header   = flv_write_header,
    .write_packet   = flv_write_packet,
    .write_trailer  = flv_write_trailer,
    .codec_tag= (const AVCodecTag* const []){flv_video_codec_ids, flv_audio_codec_ids, 0},
    .flags= AVFMT_GLOBALHEADER | AVFMT_VARIABLE_FPS,
};

/*
 *
 * Uninit VMnc decoder
 *
 */
static av_cold int decode_end(AVCodecContext *avctx)
{
    VmncContext * const c = avctx->priv_data;

    if (c->pic.data[0])
        avctx->release_buffer(avctx, &c->pic);

    av_free(c->curbits);
    av_free(c->curmask);
    av_free(c->screendta);
    return 0;
}

AVCodec ff_vmnc_decoder = {
    .name           = "vmnc",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = CODEC_ID_VMNC,
    .priv_data_size = sizeof(VmncContext),
    .init           = decode_init,
    .close          = decode_end,
    .decode         = decode_frame,
    .capabilities   = CODEC_CAP_DR1,
    .long_name = NULL_IF_CONFIG_SMALL("VMware Screen Codec / VMware Video"),
};

        avio_wl64(pb, ctx->frame_cnt * ctx->sum_delta_pts / (ctx->frame_cnt - 1));
        avio_seek(pb, end, SEEK_SET);
    }

    return 0;
}

static int ivf_check_bitstream(struct AVFormatContext *s, const AVPacket *pkt)
{
    int ret = 1;
    AVStream *st = s->streams[pkt->stream_index];

    if (st->codec->codec_id == AV_CODEC_ID_VP9)
        ret = ff_stream_add_bitstream_filter(st, "vp9_superframe", NULL);

    return ret;
}

AVOutputFormat ff_ivf_muxer = {
    .priv_data_size = sizeof(IVFEncContext),
    .name         = "ivf",
    .long_name    = NULL_IF_CONFIG_SMALL("On2 IVF"),
    .extensions   = "ivf",
    .audio_codec  = AV_CODEC_ID_NONE,
    .video_codec  = AV_CODEC_ID_VP8,
    .write_header = ivf_write_header,
    .write_packet = ivf_write_packet,
    .write_trailer = ivf_write_trailer,
    .check_bitstream = ivf_check_bitstream,
};