static int cfhd_decode(AVCodecContext *avctx, void *data, int *got_frame,

                       AVPacket *avpkt)

{

    CFHDContext *s = avctx->priv_data;

    GetByteContext gb;

    ThreadFrame frame = { .f = data };

    AVFrame *pic = data;

    int ret = 0, i, j, planes, plane, got_buffer = 0;

    int16_t *coeff_data;



    s->coded_format = AV_PIX_FMT_YUV422P10;

    init_frame_defaults(s);

    planes = av_pix_fmt_count_planes(s->coded_format);



    bytestream2_init(&gb, avpkt->data, avpkt->size);



    while (bytestream2_get_bytes_left(&gb) > 4) {

        /* Bit weird but implement the tag parsing as the spec says */

        uint16_t tagu   = bytestream2_get_be16(&gb);

        int16_t tag     = (int16_t)tagu;

        int8_t tag8     = (int8_t)(tagu >> 8);

        uint16_t abstag = abs(tag);

        int8_t abs_tag8 = abs(tag8);

        uint16_t data   = bytestream2_get_be16(&gb);

        if (abs_tag8 >= 0x60 && abs_tag8 <= 0x6f) {

            av_log(avctx, AV_LOG_DEBUG, "large len %x\n", ((tagu & 0xff) << 16) | data);

        } else if (tag == 20) {

            av_log(avctx, AV_LOG_DEBUG, "Width %"PRIu16"\n", data);

            s->coded_width = data;

        } else if (tag == 21) {

            av_log(avctx, AV_LOG_DEBUG, "Height %"PRIu16"\n", data);

            s->coded_height = data;

        } else if (tag == 101) {

            av_log(avctx, AV_LOG_DEBUG, "Bits per component: %"PRIu16"\n", data);

            if (data < 1 || data > 31) {

                av_log(avctx, AV_LOG_ERROR, "Bits per component %d is invalid\n", data);

                ret = AVERROR(EINVAL);

                break;

            }

            s->bpc = data;

        } else if (tag == 12) {

            av_log(avctx, AV_LOG_DEBUG, "Channel Count: %"PRIu16"\n", data);

            s->channel_cnt = data;

            if (data > 4) {

                av_log(avctx, AV_LOG_ERROR, "Channel Count of %"PRIu16" is unsupported\n", data);

                ret = AVERROR_PATCHWELCOME;

                break;

            }

        } else if (tag == 14) {

            av_log(avctx, AV_LOG_DEBUG, "Subband Count: %"PRIu16"\n", data);

            if (data != SUBBAND_COUNT) {

                av_log(avctx, AV_LOG_ERROR, "Subband Count of %"PRIu16" is unsupported\n", data);

                ret = AVERROR_PATCHWELCOME;

                break;

            }

        } else if (tag == 62) {

            s->channel_num = data;

            av_log(avctx, AV_LOG_DEBUG, "Channel number %"PRIu16"\n", data);

            if (s->channel_num >= planes) {

                av_log(avctx, AV_LOG_ERROR, "Invalid channel number\n");

                ret = AVERROR(EINVAL);

                break;

            }

            init_plane_defaults(s);

        } else if (tag == 48) {

            if (s->subband_num != 0 && data == 1)  // hack

                s->level++;

            av_log(avctx, AV_LOG_DEBUG, "Subband number %"PRIu16"\n", data);

            s->subband_num = data;

            if (s->level >= DWT_LEVELS) {

                av_log(avctx, AV_LOG_ERROR, "Invalid level\n");

                ret = AVERROR(EINVAL);

                break;

            }

            if (s->subband_num > 3) {

                av_log(avctx, AV_LOG_ERROR, "Invalid subband number\n");

                ret = AVERROR(EINVAL);

                break;

            }

        } else if (tag == 51) {

            av_log(avctx, AV_LOG_DEBUG, "Subband number actual %"PRIu16"\n", data);

            s->subband_num_actual = data;

            if (s->subband_num_actual >= 10) {

                av_log(avctx, AV_LOG_ERROR, "Invalid subband number actual\n");

                ret = AVERROR(EINVAL);

                break;

            }

        } else if (tag == 35)

            av_log(avctx, AV_LOG_DEBUG, "Lowpass precision bits: %"PRIu16"\n", data);

        else if (tag == 53) {

            s->quantisation = data;

            av_log(avctx, AV_LOG_DEBUG, "Quantisation: %"PRIu16"\n", data);

        } else if (tag == 109) {

            s->prescale_shift[0] = (data >> 0) & 0x7;

            s->prescale_shift[1] = (data >> 3) & 0x7;

            s->prescale_shift[2] = (data >> 6) & 0x7;

            av_log(avctx, AV_LOG_DEBUG, "Prescale shift (VC-5): %x\n", data);

        } else if (tag == 27) {

            av_log(avctx, AV_LOG_DEBUG, "Lowpass width %"PRIu16"\n", data);

            if (data < 3 || data > s->plane[s->channel_num].band[0][0].a_width) {

                av_log(avctx, AV_LOG_ERROR, "Invalid lowpass width\n");

                ret = AVERROR(EINVAL);

                break;

            }

            s->plane[s->channel_num].band[0][0].width  = data;

            s->plane[s->channel_num].band[0][0].stride = data;

        } else if (tag == 28) {

            av_log(avctx, AV_LOG_DEBUG, "Lowpass height %"PRIu16"\n", data);

            if (data < 3 || data > s->plane[s->channel_num].band[0][0].height) {

                av_log(avctx, AV_LOG_ERROR, "Invalid lowpass height\n");

                ret = AVERROR(EINVAL);

                break;

            }

            s->plane[s->channel_num].band[0][0].height = data;

        } else if (tag == 1)

            av_log(avctx, AV_LOG_DEBUG, "Sample type? %"PRIu16"\n", data);

        else if (tag == 10) {

            if (data != 0) {

                avpriv_report_missing_feature(avctx, "Transform type of %"PRIu16, data);

                ret = AVERROR_PATCHWELCOME;

                break;

            }

            av_log(avctx, AV_LOG_DEBUG, "Transform-type? %"PRIu16"\n", data);

        } else if (abstag >= 0x4000 && abstag <= 0x40ff) {

            av_log(avctx, AV_LOG_DEBUG, "Small chunk length %d %s\n", data * 4, tag < 0 ? "optional" : "required");

            bytestream2_skipu(&gb, data * 4);

        } else if (tag == 23) {

            av_log(avctx, AV_LOG_DEBUG, "Skip frame\n");

            avpriv_report_missing_feature(avctx, "Skip frame");

            ret = AVERROR_PATCHWELCOME;

            break;

        } else if (tag == 2) {

            av_log(avctx, AV_LOG_DEBUG, "tag=2 header - skipping %i tag/value pairs\n", data);

            if (data > bytestream2_get_bytes_left(&gb) / 4) {

                av_log(avctx, AV_LOG_ERROR, "too many tag/value pairs (%d)\n", data);

                ret = AVERROR_INVALIDDATA;

                break;

            }

            for (i = 0; i < data; i++) {

                uint16_t tag2 = bytestream2_get_be16(&gb);

                uint16_t val2 = bytestream2_get_be16(&gb);

                av_log(avctx, AV_LOG_DEBUG, "Tag/Value = %x %x\n", tag2, val2);

            }

        } else if (tag == 41) {

            av_log(avctx, AV_LOG_DEBUG, "Highpass width %i channel %i level %i subband %i\n", data, s->channel_num, s->level, s->subband_num);

            if (data < 3) {

                av_log(avctx, AV_LOG_ERROR, "Invalid highpass width\n");

                ret = AVERROR(EINVAL);

                break;

            }

            s->plane[s->channel_num].band[s->level][s->subband_num].width  = data;

            s->plane[s->channel_num].band[s->level][s->subband_num].stride = FFALIGN(data, 8);

        } else if (tag == 42) {

            av_log(avctx, AV_LOG_DEBUG, "Highpass height %i\n", data);

            if (data < 3) {

                av_log(avctx, AV_LOG_ERROR, "Invalid highpass height\n");

                ret = AVERROR(EINVAL);

                break;

            }

            s->plane[s->channel_num].band[s->level][s->subband_num].height = data;

        } else if (tag == 49) {

            av_log(avctx, AV_LOG_DEBUG, "Highpass width2 %i\n", data);

            if (data < 3) {

                av_log(avctx, AV_LOG_ERROR, "Invalid highpass width2\n");

                ret = AVERROR(EINVAL);

                break;

            }

            s->plane[s->channel_num].band[s->level][s->subband_num].width  = data;

            s->plane[s->channel_num].band[s->level][s->subband_num].stride = FFALIGN(data, 8);

        } else if (tag == 50) {

            av_log(avctx, AV_LOG_DEBUG, "Highpass height2 %i\n", data);

            if (data < 3) {

                av_log(avctx, AV_LOG_ERROR, "Invalid highpass height2\n");

                ret = AVERROR(EINVAL);

                break;

            }

            s->plane[s->channel_num].band[s->level][s->subband_num].height = data;

        } else if (tag == 71) {

            s->codebook = data;

            av_log(avctx, AV_LOG_DEBUG, "Codebook %i\n", s->codebook);

        } else if (tag == 72) {

            s->codebook = data;

            av_log(avctx, AV_LOG_DEBUG, "Other codebook? %i\n", s->codebook);

        } else if (tag == 70) {

            av_log(avctx, AV_LOG_DEBUG, "Subsampling or bit-depth flag? %i\n", data);

            if (!(data == 10 || data == 12)) {

                av_log(avctx, AV_LOG_ERROR, "Invalid bits per channel\n");

                ret = AVERROR(EINVAL);

                break;

            }

            s->bpc = data;

        } else if (tag == 84) {

            av_log(avctx, AV_LOG_DEBUG, "Sample format? %i\n", data);

            if (data == 1)

                s->coded_format = AV_PIX_FMT_YUV422P10;

            else if (data == 3)

                s->coded_format = AV_PIX_FMT_GBRP12;

            else if (data == 4)

                s->coded_format = AV_PIX_FMT_GBRAP12;

            else {

                avpriv_report_missing_feature(avctx, "Sample format of %"PRIu16, data);

                ret = AVERROR_PATCHWELCOME;

                break;

            }

            planes = av_pix_fmt_count_planes(s->coded_format);

        } else

            av_log(avctx, AV_LOG_DEBUG,  "Unknown tag %i data %x\n", tag, data);



        /* Some kind of end of header tag */

        if (tag == 4 && data == 0x1a4a && s->coded_width && s->coded_height &&

            s->coded_format != AV_PIX_FMT_NONE) {

            if (s->a_width != s->coded_width || s->a_height != s->coded_height ||

                s->a_format != s->coded_format) {

                free_buffers(avctx);

                if ((ret = alloc_buffers(avctx)) < 0) {

                    free_buffers(avctx);

                    return ret;

                }

            }

            ret = ff_set_dimensions(avctx, s->coded_width, s->coded_height);

            if (ret < 0)

                return ret;

            frame.f->width =

            frame.f->height = 0;



            if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)

                return ret;



            s->coded_width = 0;

            s->coded_height = 0;

            s->coded_format = AV_PIX_FMT_NONE;

            got_buffer = 1;

        }

        coeff_data = s->plane[s->channel_num].subband[s->subband_num_actual];



        /* Lowpass coefficients */

        if (tag == 4 && data == 0xf0f && s->a_width && s->a_height) {

            int lowpass_height = s->plane[s->channel_num].band[0][0].height;

            int lowpass_width  = s->plane[s->channel_num].band[0][0].width;

            int lowpass_a_height = s->plane[s->channel_num].band[0][0].a_height;

            int lowpass_a_width  = s->plane[s->channel_num].band[0][0].a_width;



            if (!got_buffer) {

                av_log(avctx, AV_LOG_ERROR, "No end of header tag found\n");

                ret = AVERROR(EINVAL);

                goto end;

            }



            if (lowpass_height > lowpass_a_height || lowpass_width > lowpass_a_width ||

                lowpass_a_width * lowpass_a_height * sizeof(int16_t) > bytestream2_get_bytes_left(&gb)) {

                av_log(avctx, AV_LOG_ERROR, "Too many lowpass coefficients\n");

                ret = AVERROR(EINVAL);

                goto end;

            }



            av_log(avctx, AV_LOG_DEBUG, "Start of lowpass coeffs component %d height:%d, width:%d\n", s->channel_num, lowpass_height, lowpass_width);

            for (i = 0; i < lowpass_height; i++) {

                for (j = 0; j < lowpass_width; j++)

                    coeff_data[j] = bytestream2_get_be16u(&gb);



                coeff_data += lowpass_width;

            }



            /* Align to mod-4 position to continue reading tags */

            bytestream2_seek(&gb, bytestream2_tell(&gb) & 3, SEEK_CUR);



            /* Copy last line of coefficients if odd height */

            if (lowpass_height & 1) {

                memcpy(&coeff_data[lowpass_height * lowpass_width],

                       &coeff_data[(lowpass_height - 1) * lowpass_width],

                       lowpass_width * sizeof(*coeff_data));

            }



            av_log(avctx, AV_LOG_DEBUG, "Lowpass coefficients %d\n", lowpass_width * lowpass_height);

        }



        if (tag == 55 && s->subband_num_actual != 255 && s->a_width && s->a_height) {

            int highpass_height = s->plane[s->channel_num].band[s->level][s->subband_num].height;

            int highpass_width  = s->plane[s->channel_num].band[s->level][s->subband_num].width;

            int highpass_a_width = s->plane[s->channel_num].band[s->level][s->subband_num].a_width;

            int highpass_a_height = s->plane[s->channel_num].band[s->level][s->subband_num].a_height;

            int highpass_stride = s->plane[s->channel_num].band[s->level][s->subband_num].stride;

            int expected;

            int a_expected = highpass_a_height * highpass_a_width;

            int level, run, coeff;

            int count = 0, bytes;



            if (!got_buffer) {

                av_log(avctx, AV_LOG_ERROR, "No end of header tag found\n");

                ret = AVERROR(EINVAL);

                goto end;

            }



            if (highpass_height > highpass_a_height || highpass_width > highpass_a_width || a_expected < highpass_height * (uint64_t)highpass_stride) {

                av_log(avctx, AV_LOG_ERROR, "Too many highpass coefficients\n");

                ret = AVERROR(EINVAL);

                goto end;

            }

            expected = highpass_height * highpass_stride;



            av_log(avctx, AV_LOG_DEBUG, "Start subband coeffs plane %i level %i codebook %i expected %i\n", s->channel_num, s->level, s->codebook, expected);



            init_get_bits(&s->gb, gb.buffer, bytestream2_get_bytes_left(&gb) * 8);

            {

                OPEN_READER(re, &s->gb);

                if (!s->codebook) {

                    while (1) {

                        UPDATE_CACHE(re, &s->gb);

                        GET_RL_VLC(level, run, re, &s->gb, s->table_9_rl_vlc,

                                   VLC_BITS, 3, 1);



                        /* escape */

                        if (level == 64)

                            break;



                        count += run;



                        if (count > expected)

                            break;



                        coeff = dequant_and_decompand(level, s->quantisation);

                        for (i = 0; i < run; i++)

                            *coeff_data++ = coeff;

                    }

                } else {

                    while (1) {

                        UPDATE_CACHE(re, &s->gb);

                        GET_RL_VLC(level, run, re, &s->gb, s->table_18_rl_vlc,

                                   VLC_BITS, 3, 1);



                        /* escape */

                        if (level == 255 && run == 2)

                            break;



                        count += run;



                        if (count > expected)

                            break;



                        coeff = dequant_and_decompand(level, s->quantisation);

                        for (i = 0; i < run; i++)

                            *coeff_data++ = coeff;

                    }

                }

                CLOSE_READER(re, &s->gb);

            }



            if (count > expected) {

                av_log(avctx, AV_LOG_ERROR, "Escape codeword not found, probably corrupt data\n");

                ret = AVERROR(EINVAL);

                goto end;

            }



            bytes = FFALIGN(FF_CEIL_RSHIFT(get_bits_count(&s->gb), 3), 4);

            if (bytes > bytestream2_get_bytes_left(&gb)) {

                av_log(avctx, AV_LOG_ERROR, "Bitstream overread error\n");

                ret = AVERROR(EINVAL);

                goto end;

            } else

                bytestream2_seek(&gb, bytes, SEEK_CUR);



            av_log(avctx, AV_LOG_DEBUG, "End subband coeffs %i extra %i\n", count, count - expected);

            s->codebook = 0;



            /* Copy last line of coefficients if odd height */

            if (highpass_height & 1) {

                memcpy(&coeff_data[highpass_height * highpass_stride],

                       &coeff_data[(highpass_height - 1) * highpass_stride],

                       highpass_stride * sizeof(*coeff_data));

            }

        }

    }



    if (!s->a_width || !s->a_height || s->a_format == AV_PIX_FMT_NONE ||

        s->coded_width || s->coded_height || s->coded_format != AV_PIX_FMT_NONE) {

        av_log(avctx, AV_LOG_ERROR, "Invalid dimensions\n");

        ret = AVERROR(EINVAL);

        goto end;

    }



    if (!got_buffer) {

        av_log(avctx, AV_LOG_ERROR, "No end of header tag found\n");

        ret = AVERROR(EINVAL);

        goto end;

    }



    planes = av_pix_fmt_count_planes(avctx->pix_fmt);

    for (plane = 0; plane < planes && !ret; plane++) {

        /* level 1 */

        int lowpass_height  = s->plane[plane].band[0][0].height;

        int lowpass_width   = s->plane[plane].band[0][0].width;

        int highpass_stride = s->plane[plane].band[0][1].stride;

        int act_plane = plane == 1 ? 2 : plane == 2 ? 1 : plane;

        int16_t *low, *high, *output, *dst;



        if (lowpass_height > s->plane[plane].band[0][0].a_height || lowpass_width > s->plane[plane].band[0][0].a_width ||

            !highpass_stride || s->plane[plane].band[0][1].width > s->plane[plane].band[0][1].a_width) {

            av_log(avctx, AV_LOG_ERROR, "Invalid plane dimensions\n");

            ret = AVERROR(EINVAL);

            goto end;

        }



        av_log(avctx, AV_LOG_DEBUG, "Decoding level 1 plane %i %i %i %i\n", plane, lowpass_height, lowpass_width, highpass_stride);



        low    = s->plane[plane].subband[0];

        high   = s->plane[plane].subband[2];

        output = s->plane[plane].l_h[0];

        for (i = 0; i < lowpass_width; i++) {

            vert_filter(output, lowpass_width, low, lowpass_width, high, highpass_stride, lowpass_height);

            low++;

            high++;

            output++;

        }



        low    = s->plane[plane].subband[1];

        high   = s->plane[plane].subband[3];

        output = s->plane[plane].l_h[1];



        for (i = 0; i < lowpass_width; i++) {

            // note the stride of "low" is highpass_stride

            vert_filter(output, lowpass_width, low, highpass_stride, high, highpass_stride, lowpass_height);

            low++;

            high++;

            output++;

        }



        low    = s->plane[plane].l_h[0];

        high   = s->plane[plane].l_h[1];

        output = s->plane[plane].subband[0];

        for (i = 0; i < lowpass_height * 2; i++) {

            horiz_filter(output, low, high, lowpass_width);

            low    += lowpass_width;

            high   += lowpass_width;

            output += lowpass_width * 2;

        }

        if (s->bpc == 12) {

            output = s->plane[plane].subband[0];

            for (i = 0; i < lowpass_height * 2; i++) {

                for (j = 0; j < lowpass_width * 2; j++)

                    output[j] *= 4;



                output += lowpass_width * 2;

            }

        }



        /* level 2 */

        lowpass_height  = s->plane[plane].band[1][1].height;

        lowpass_width   = s->plane[plane].band[1][1].width;

        highpass_stride = s->plane[plane].band[1][1].stride;



        if (lowpass_height > s->plane[plane].band[1][1].a_height || lowpass_width > s->plane[plane].band[1][1].a_width ||

            !highpass_stride || s->plane[plane].band[1][1].width > s->plane[plane].band[1][1].a_width) {

            av_log(avctx, AV_LOG_ERROR, "Invalid plane dimensions\n");

            ret = AVERROR(EINVAL);

            goto end;

        }



        av_log(avctx, AV_LOG_DEBUG, "Level 2 plane %i %i %i %i\n", plane, lowpass_height, lowpass_width, highpass_stride);



        low    = s->plane[plane].subband[0];

        high   = s->plane[plane].subband[5];

        output = s->plane[plane].l_h[3];

        for (i = 0; i < lowpass_width; i++) {

            vert_filter(output, lowpass_width, low, lowpass_width, high, highpass_stride, lowpass_height);

            low++;

            high++;

            output++;

        }



        low    = s->plane[plane].subband[4];

        high   = s->plane[plane].subband[6];

        output = s->plane[plane].l_h[4];

        for (i = 0; i < lowpass_width; i++) {

            vert_filter(output, lowpass_width, low, highpass_stride, high, highpass_stride, lowpass_height);

            low++;

            high++;

            output++;

        }



        low    = s->plane[plane].l_h[3];

        high   = s->plane[plane].l_h[4];

        output = s->plane[plane].subband[0];

        for (i = 0; i < lowpass_height * 2; i++) {

            horiz_filter(output, low, high, lowpass_width);

            low    += lowpass_width;

            high   += lowpass_width;

            output += lowpass_width * 2;

        }



        output = s->plane[plane].subband[0];

        for (i = 0; i < lowpass_height * 2; i++) {

            for (j = 0; j < lowpass_width * 2; j++)

                output[j] *= 4;



            output += lowpass_width * 2;

        }



        /* level 3 */

        lowpass_height  = s->plane[plane].band[2][1].height;

        lowpass_width   = s->plane[plane].band[2][1].width;

        highpass_stride = s->plane[plane].band[2][1].stride;



        if (lowpass_height > s->plane[plane].band[2][1].a_height || lowpass_width > s->plane[plane].band[2][1].a_width ||

            !highpass_stride || s->plane[plane].band[2][1].width > s->plane[plane].band[2][1].a_width) {

            av_log(avctx, AV_LOG_ERROR, "Invalid plane dimensions\n");

            ret = AVERROR(EINVAL);

            goto end;

        }



        av_log(avctx, AV_LOG_DEBUG, "Level 3 plane %i %i %i %i\n", plane, lowpass_height, lowpass_width, highpass_stride);



        low    = s->plane[plane].subband[0];

        high   = s->plane[plane].subband[8];

        output = s->plane[plane].l_h[6];

        for (i = 0; i < lowpass_width; i++) {

            vert_filter(output, lowpass_width, low, lowpass_width, high, highpass_stride, lowpass_height);

            low++;

            high++;

            output++;

        }



        low    = s->plane[plane].subband[7];

        high   = s->plane[plane].subband[9];

        output = s->plane[plane].l_h[7];

        for (i = 0; i < lowpass_width; i++) {

            vert_filter(output, lowpass_width, low, highpass_stride, high, highpass_stride, lowpass_height);

            low++;

            high++;

            output++;

        }



        dst = (int16_t *)pic->data[act_plane];

        low  = s->plane[plane].l_h[6];

        high = s->plane[plane].l_h[7];

        for (i = 0; i < lowpass_height * 2; i++) {

            horiz_filter_clip(dst, low, high, lowpass_width, s->bpc);

            low  += lowpass_width;

            high += lowpass_width;

            dst  += pic->linesize[act_plane] / 2;

        }

    }





end:

    if (ret < 0)

        return ret;



    *got_frame = 1;

    return avpkt->size;

}
