C++ (Cpp) ff_mjpeg_build_huffman_codesの例

コード例 #1

ファイル: mjpegenc.c プロジェクト: MarcAntoine-Arnaud/libav

av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
{
    MJpegContext *m;

    m = av_malloc(sizeof(MJpegContext));
    if (!m)
        return AVERROR(ENOMEM);

    s->min_qcoeff=-1023;
    s->max_qcoeff= 1023;

    /* build all the huffman tables */
    ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
                                 m->huff_code_dc_luminance,
                                 avpriv_mjpeg_bits_dc_luminance,
                                 avpriv_mjpeg_val_dc);
    ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
                                 m->huff_code_dc_chrominance,
                                 avpriv_mjpeg_bits_dc_chrominance,
                                 avpriv_mjpeg_val_dc);
    ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
                                 m->huff_code_ac_luminance,
                                 avpriv_mjpeg_bits_ac_luminance,
                                 avpriv_mjpeg_val_ac_luminance);
    ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
                                 m->huff_code_ac_chrominance,
                                 avpriv_mjpeg_bits_ac_chrominance,
                                 avpriv_mjpeg_val_ac_chrominance);

    s->mjpeg_ctx = m;
    return 0;
}

コード例 #2

ファイル: mjpegenc.c プロジェクト: 0Soul/FFmpeg

av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
{
    MJpegContext *m;

    if (s->width > 65500 || s->height > 65500) {
        av_log(s, AV_LOG_ERROR, "JPEG does not support resolutions above 65500x65500\n");
        return AVERROR(EINVAL);
    }

    m = av_malloc(sizeof(MJpegContext));
    if (!m)
        return AVERROR(ENOMEM);

    s->min_qcoeff=-1023;
    s->max_qcoeff= 1023;

    /* build all the huffman tables */
    ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
                                 m->huff_code_dc_luminance,
                                 avpriv_mjpeg_bits_dc_luminance,
                                 avpriv_mjpeg_val_dc);
    ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
                                 m->huff_code_dc_chrominance,
                                 avpriv_mjpeg_bits_dc_chrominance,
                                 avpriv_mjpeg_val_dc);
    ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
                                 m->huff_code_ac_luminance,
                                 avpriv_mjpeg_bits_ac_luminance,
                                 avpriv_mjpeg_val_ac_luminance);
    ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
                                 m->huff_code_ac_chrominance,
                                 avpriv_mjpeg_bits_ac_chrominance,
                                 avpriv_mjpeg_val_ac_chrominance);

    s->mjpeg_ctx = m;
    return 0;
}

コード例 #3

ファイル: g2meet.c プロジェクト: smolleyes/chromium-ffmpeg

static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table,
                             const uint8_t *val_table, int nb_codes,
                             int is_ac)
{
    uint8_t  huff_size[256] = { 0 };
    uint16_t huff_code[256];
    uint16_t huff_sym[256];
    int i;

    ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);

    for (i = 0; i < 256; i++)
        huff_sym[i] = i + 16 * is_ac;

    if (is_ac)
        huff_sym[0] = 16 * 256;

    return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
                              huff_code, 2, 2, huff_sym, 2, 2, 0);
}