C++ INIT_VLC_STATIC函数代码示例

av_cold void ff_ccitt_unpack_init(void)
{
    static VLC_TYPE code_table1[528][2];
    static VLC_TYPE code_table2[648][2];
    int i;
    static int initialized = 0;

    if (initialized)
        return;
    ccitt_vlc[0].table = code_table1;
    ccitt_vlc[0].table_allocated = 528;
    ccitt_vlc[1].table = code_table2;
    ccitt_vlc[1].table_allocated = 648;
    for (i = 0; i < 2; i++) {
        ff_init_vlc_sparse(&ccitt_vlc[i], 9, CCITT_SYMS,
                           ccitt_codes_lens[i], 1, 1,
                           ccitt_codes_bits[i], 1, 1,
                           ccitt_syms, 2, 2,
                           INIT_VLC_USE_NEW_STATIC);
    }
    INIT_VLC_STATIC(&ccitt_group3_2d_vlc, 9, 11,
                    ccitt_group3_2d_lens, 1, 1,
                    ccitt_group3_2d_bits, 1, 1, 512);
    initialized = 1;
}

static av_cold void h261_decode_init_vlc(H261Context *h){
    static int done = 0;

    if(!done){
        done = 1;
        INIT_VLC_STATIC(&h261_mba_vlc, H261_MBA_VLC_BITS, 35,
                 h261_mba_bits, 1, 1,
                 h261_mba_code, 1, 1, 662);
        INIT_VLC_STATIC(&h261_mtype_vlc, H261_MTYPE_VLC_BITS, 10,
                 h261_mtype_bits, 1, 1,
                 h261_mtype_code, 1, 1, 80);
        INIT_VLC_STATIC(&h261_mv_vlc, H261_MV_VLC_BITS, 17,
                 &h261_mv_tab[0][1], 2, 1,
                 &h261_mv_tab[0][0], 2, 1, 144);
        INIT_VLC_STATIC(&h261_cbp_vlc, H261_CBP_VLC_BITS, 63,
                 &h261_cbp_tab[0][1], 2, 1,
                 &h261_cbp_tab[0][0], 2, 1, 512);
        init_rl(&h261_rl_tcoeff, ff_h261_rl_table_store);
        INIT_VLC_RL(h261_rl_tcoeff, 552);
    }
}

static av_cold void h261_decode_init_vlc(H261Context *h) {
    static int done = 0;
    // fixed to avoid multi decoders conflict when playing together  (by Daniel)
    if(!done || 1) {
        done = 1;
        INIT_VLC_STATIC(&h261_mba_vlc, H261_MBA_VLC_BITS, 35,
                        h261_mba_bits, 1, 1,
                        h261_mba_code, 1, 1, 662);
        INIT_VLC_STATIC(&h261_mtype_vlc, H261_MTYPE_VLC_BITS, 10,
                        h261_mtype_bits, 1, 1,
                        h261_mtype_code, 1, 1, 80);
        INIT_VLC_STATIC(&h261_mv_vlc, H261_MV_VLC_BITS, 17,
                        &h261_mv_tab[0][1], 2, 1,
                        &h261_mv_tab[0][0], 2, 1, 144);
        INIT_VLC_STATIC(&h261_cbp_vlc, H261_CBP_VLC_BITS, 63,
                        &h261_cbp_tab[0][1], 2, 1,
                        &h261_cbp_tab[0][0], 2, 1, 512);
        init_rl(&h261_rl_tcoeff, ff_h261_rl_table_store);
        INIT_VLC_RL(h261_rl_tcoeff, 552);
    }
}

/* XXX: find a better solution to handle static init */
av_cold void ff_h263_decode_init_vlc(void)
{
    static volatile int done = 0;

    if (!done) {
        INIT_VLC_STATIC(&ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9,
                 ff_h263_intra_MCBPC_bits, 1, 1,
                 ff_h263_intra_MCBPC_code, 1, 1, 72);
        INIT_VLC_STATIC(&ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28,
                 ff_h263_inter_MCBPC_bits, 1, 1,
                 ff_h263_inter_MCBPC_code, 1, 1, 198);
        INIT_VLC_STATIC(&ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16,
                 &ff_h263_cbpy_tab[0][1], 2, 1,
                 &ff_h263_cbpy_tab[0][0], 2, 1, 64);
        INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 33,
                 &ff_mvtab[0][1], 2, 1,
                 &ff_mvtab[0][0], 2, 1, 538);
        ff_init_rl(&ff_h263_rl_inter, ff_h263_static_rl_table_store[0]);
        ff_init_rl(&ff_rl_intra_aic, ff_h263_static_rl_table_store[1]);
        INIT_VLC_RL(ff_h263_rl_inter, 554);
        INIT_VLC_RL(ff_rl_intra_aic, 554);
        INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,
                 &ff_h263_mbtype_b_tab[0][1], 2, 1,
                 &ff_h263_mbtype_b_tab[0][0], 2, 1, 80);
        INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4,
                 &ff_cbpc_b_tab[0][1], 2, 1,
                 &ff_cbpc_b_tab[0][0], 2, 1, 8);
        done = 1;
    }
}

static av_cold void init_vlcs(ASV1Context *a){
    static int done = 0;

    if (!done) {
        done = 1;

        INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
                 &ff_asv_ccp_tab[0][1], 2, 1,
                 &ff_asv_ccp_tab[0][0], 2, 1, 64);
        INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
                 &ff_asv_dc_ccp_tab[0][1], 2, 1,
                 &ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
        INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,
                 &ff_asv_ac_ccp_tab[0][1], 2, 1,
                 &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
        INIT_VLC_STATIC(&level_vlc,  VLC_BITS, 7,
                 &ff_asv_level_tab[0][1], 2, 1,
                 &ff_asv_level_tab[0][0], 2, 1, 64);
        INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
                 &ff_asv2_level_tab[0][1], 2, 1,
                 &ff_asv2_level_tab[0][0], 2, 1, 1024);
    }
}

av_cold void ff_mpeg12_init_vlcs(void)
{
    static int done = 0;

    if (!done) {
        done = 1;

        INIT_VLC_STATIC(&ff_dc_lum_vlc, DC_VLC_BITS, 12,
                        ff_mpeg12_vlc_dc_lum_bits, 1, 1,
                        ff_mpeg12_vlc_dc_lum_code, 2, 2, 512);
        INIT_VLC_STATIC(&ff_dc_chroma_vlc,  DC_VLC_BITS, 12,
                        ff_mpeg12_vlc_dc_chroma_bits, 1, 1,
                        ff_mpeg12_vlc_dc_chroma_code, 2, 2, 514);
        INIT_VLC_STATIC(&ff_mv_vlc, MV_VLC_BITS, 17,
                        &ff_mpeg12_mbMotionVectorTable[0][1], 2, 1,
                        &ff_mpeg12_mbMotionVectorTable[0][0], 2, 1, 518);
        INIT_VLC_STATIC(&ff_mbincr_vlc, MBINCR_VLC_BITS, 36,
                        &ff_mpeg12_mbAddrIncrTable[0][1], 2, 1,
                        &ff_mpeg12_mbAddrIncrTable[0][0], 2, 1, 538);
        INIT_VLC_STATIC(&ff_mb_pat_vlc, MB_PAT_VLC_BITS, 64,
                        &ff_mpeg12_mbPatTable[0][1], 2, 1,
                        &ff_mpeg12_mbPatTable[0][0], 2, 1, 512);

        INIT_VLC_STATIC(&ff_mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7,
                        &table_mb_ptype[0][1], 2, 1,
                        &table_mb_ptype[0][0], 2, 1, 64);
        INIT_VLC_STATIC(&ff_mb_btype_vlc, MB_BTYPE_VLC_BITS, 11,
                        &table_mb_btype[0][1], 2, 1,
                        &table_mb_btype[0][0], 2, 1, 64);
        ff_init_rl(&ff_rl_mpeg1, ff_mpeg12_static_rl_table_store[0]);
        ff_init_rl(&ff_rl_mpeg2, ff_mpeg12_static_rl_table_store[1]);

        INIT_2D_VLC_RL(ff_rl_mpeg1, 680);
        INIT_2D_VLC_RL(ff_rl_mpeg2, 674);
    }
}

static av_cold int rv10_decode_init(AVCodecContext *avctx)
{
    MpegEncContext *s = avctx->priv_data;
    static int done=0;

    if (avctx->extradata_size < 8) {
        av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
        return -1;
    }

    MPV_decode_defaults(s);

    s->avctx= avctx;
    s->out_format = FMT_H263;
    s->codec_id= avctx->codec_id;

    s->orig_width = s->width  = avctx->coded_width;
    s->orig_height= s->height = avctx->coded_height;

    s->h263_long_vectors= ((uint8_t*)avctx->extradata)[3] & 1;
    avctx->sub_id= AV_RB32((uint8_t*)avctx->extradata + 4);

    if (avctx->sub_id == 0x10000000) {
        s->rv10_version= 0;
        s->low_delay=1;
    } else if (avctx->sub_id == 0x10001000) {
        s->rv10_version= 3;
        s->low_delay=1;
    } else if (avctx->sub_id == 0x10002000) {
        s->rv10_version= 3;
        s->low_delay=1;
        s->obmc=1;
    } else if (avctx->sub_id == 0x10003000) {
        s->rv10_version= 3;
        s->low_delay=1;
    } else if (avctx->sub_id == 0x10003001) {
        s->rv10_version= 3;
        s->low_delay=1;
    } else if (    avctx->sub_id == 0x20001000
               || (avctx->sub_id >= 0x20100000 && avctx->sub_id < 0x201a0000)) {
        s->low_delay=1;
    } else if (    avctx->sub_id == 0x30202002
               ||  avctx->sub_id == 0x30203002
               || (avctx->sub_id >= 0x20200002 && avctx->sub_id < 0x20300000)) {
        s->low_delay=0;
        s->avctx->has_b_frames=1;
    } else
        av_log(s->avctx, AV_LOG_ERROR, "unknown header %X\n", avctx->sub_id);

    if(avctx->debug & FF_DEBUG_PICT_INFO){
        av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%X\n", avctx->sub_id, avctx->extradata_size >= 4 ? ((uint32_t*)avctx->extradata)[0] : -1);
    }

    avctx->pix_fmt = PIX_FMT_YUV420P;

    if (MPV_common_init(s) < 0)
        return -1;

    h263_decode_init_vlc(s);

    /* init rv vlc */
    if (!done) {
        INIT_VLC_STATIC(&rv_dc_lum, DC_VLC_BITS, 256,
                 rv_lum_bits, 1, 1,
                 rv_lum_code, 2, 2, 16384);
        INIT_VLC_STATIC(&rv_dc_chrom, DC_VLC_BITS, 256,
                 rv_chrom_bits, 1, 1,
                 rv_chrom_code, 2, 2, 16388);
        done = 1;
    }

    return 0;
}

static av_cold int rv10_decode_init(AVCodecContext *avctx)
{
    MpegEncContext *s = avctx->priv_data;
    static int done=0;
    int major_ver, minor_ver, micro_ver;

    if (avctx->extradata_size < 8) {
        av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
        return -1;
    }

    MPV_decode_defaults(s);

    s->avctx= avctx;
    s->out_format = FMT_H263;
    s->codec_id= avctx->codec_id;

    s->orig_width = s->width  = avctx->coded_width;
    s->orig_height= s->height = avctx->coded_height;

    s->h263_long_vectors= ((uint8_t*)avctx->extradata)[3] & 1;
    avctx->sub_id= AV_RB32((uint8_t*)avctx->extradata + 4);

    major_ver = RV_GET_MAJOR_VER(avctx->sub_id);
    minor_ver = RV_GET_MINOR_VER(avctx->sub_id);
    micro_ver = RV_GET_MICRO_VER(avctx->sub_id);

    s->low_delay = 1;
    switch (major_ver) {
    case 1:
        s->rv10_version = micro_ver ? 3 : 1;
        s->obmc = micro_ver == 2;
        break;
    case 2:
        if (minor_ver >= 2) {
            s->low_delay = 0;
            s->avctx->has_b_frames = 1;
        }
        break;
    default:
        av_log(s->avctx, AV_LOG_ERROR, "unknown header %X\n", avctx->sub_id);
        av_log_missing_feature(avctx, "RV1/2 version", 1);
        return AVERROR_PATCHWELCOME;
    }

    if(avctx->debug & FF_DEBUG_PICT_INFO) {
        av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%X\n", avctx->sub_id, avctx->extradata_size >= 4 ? ((uint32_t*)avctx->extradata)[0] : -1);
    }

    avctx->pix_fmt = PIX_FMT_YUV420P;

    if (MPV_common_init(s) < 0)
        return -1;

    h263_decode_init_vlc(s);

    /* init rv vlc */
    if (!done) {
        INIT_VLC_STATIC(&rv_dc_lum, DC_VLC_BITS, 256,
                        rv_lum_bits, 1, 1,
                        rv_lum_code, 2, 2, 16384);
        INIT_VLC_STATIC(&rv_dc_chrom, DC_VLC_BITS, 256,
                        rv_chrom_bits, 1, 1,
                        rv_chrom_code, 2, 2, 16388);
        done = 1;
    }

    return 0;
}

static av_cold int aac_decode_init(AVCodecContext *avctx)
{
    AACContext *ac = avctx->priv_data;

    ac->avctx = avctx;
    ac->m4ac.sample_rate = avctx->sample_rate;

    if (avctx->extradata_size > 0) {
        if (decode_audio_specific_config(ac, avctx->extradata, avctx->extradata_size))
            return -1;
    }

    avctx->sample_fmt = SAMPLE_FMT_S16;

    AAC_INIT_VLC_STATIC( 0, 304);
    AAC_INIT_VLC_STATIC( 1, 270);
    AAC_INIT_VLC_STATIC( 2, 550);
    AAC_INIT_VLC_STATIC( 3, 300);
    AAC_INIT_VLC_STATIC( 4, 328);
    AAC_INIT_VLC_STATIC( 5, 294);
    AAC_INIT_VLC_STATIC( 6, 306);
    AAC_INIT_VLC_STATIC( 7, 268);
    AAC_INIT_VLC_STATIC( 8, 510);
    AAC_INIT_VLC_STATIC( 9, 366);
    AAC_INIT_VLC_STATIC(10, 462);

    ff_aac_sbr_init();

    dsputil_init(&ac->dsp, avctx);

    ac->random_state = 0x1f2e3d4c;

    // -1024 - Compensate wrong IMDCT method.
    // 32768 - Required to scale values to the correct range for the bias method
    //         for float to int16 conversion.

    if (ac->dsp.float_to_int16_interleave == ff_float_to_int16_interleave_c) {
        ac->add_bias  = 385.0f;
        ac->sf_scale  = 1. / (-1024. * 32768.);
        ac->sf_offset = 0;
    } else {
        ac->add_bias  = 0.0f;
        ac->sf_scale  = 1. / -1024.;
        ac->sf_offset = 60;
    }

    ff_aac_tableinit();

    INIT_VLC_STATIC(&vlc_scalefactors,7,FF_ARRAY_ELEMS(ff_aac_scalefactor_code),
                    ff_aac_scalefactor_bits, sizeof(ff_aac_scalefactor_bits[0]), sizeof(ff_aac_scalefactor_bits[0]),
                    ff_aac_scalefactor_code, sizeof(ff_aac_scalefactor_code[0]), sizeof(ff_aac_scalefactor_code[0]),
                    352);

    ff_mdct_init(&ac->mdct, 11, 1, 1.0);
    ff_mdct_init(&ac->mdct_small, 8, 1, 1.0);
    // window initialization
    ff_kbd_window_init(ff_aac_kbd_long_1024, 4.0, 1024);
    ff_kbd_window_init(ff_aac_kbd_short_128, 6.0, 128);
    ff_init_ff_sine_windows(10);
    ff_init_ff_sine_windows( 7);

    cbrt_tableinit();

    return 0;
}