/*

 * Copyright (c) 2015-2016 Kieran Kunhya <kieran@kunhya.com>

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

/**

 * @file

 * Cineform HD video decoder

 */

#include "libavutil/attributes.h"

#include "libavutil/common.h"

#include "libavutil/imgutils.h"

#include "libavutil/intreadwrite.h"

#include "libavutil/mem.h"

#include "libavutil/pixdesc.h"

#include "avcodec.h"

#include "bytestream.h"

#include "codec_internal.h"

#include "decode.h"

#include "get_bits.h"

#include "internal.h"

#include "thread.h"

#include "cfhd.h"

#define ALPHA_COMPAND_DC_OFFSET 256

#define ALPHA_COMPAND_GAIN 9400

static av_cold int cfhd_init(AVCodecContext *avctx)

{

    CFHDContext *s = avctx->priv_data;

    s->avctx                   = avctx;

    for (int i = 0; i < 64; i++) {

        int val = i;

        if (val >= 40) {

            if (val >= 54) {

                val -= 54;

                val <<= 2;

                val += 54;

            }

            val -= 40;

            val <<= 2;

            val += 40;

        }

        s->lut[0][i] = val;

    }

    for (int i = 0; i < 256; i++)

        s->lut[1][i] = i + ((768LL * i * i * i) / (256 * 256 * 256));

    return ff_cfhd_init_vlcs(s);

}

static void init_plane_defaults(CFHDContext *s)

{

    s->subband_num        = 0;

    s->level              = 0;

    s->subband_num_actual = 0;

}

static void init_peak_table_defaults(CFHDContext *s)

{

    s->peak.level  = 0;

    s->peak.offset = 0;

    memset(&s->peak.base, 0, sizeof(s->peak.base));

}

static void init_frame_defaults(CFHDContext *s)

{

    s->coded_width       = 0;

    s->coded_height      = 0;

    s->coded_format      = AV_PIX_FMT_YUV422P10;

    s->cropped_height    = 0;

    s->bpc               = 10;

    s->channel_cnt       = 3;

    s->subband_cnt       = SUBBAND_COUNT;

    s->channel_num       = 0;

    s->lowpass_precision = 16;

    s->quantisation      = 1;

    s->codebook          = 0;

    s->difference_coding = 0;

    s->frame_type        = 0;

    s->sample_type       = 0;

    if (s->transform_type != 2)

        s->transform_type = -1;

    init_plane_defaults(s);

    init_peak_table_defaults(s);

}

static inline int dequant_and_decompand(CFHDContext *s, int level, int quantisation, int codebook)

{

    if (codebook == 0 || codebook == 1) {

        return s->lut[codebook][abs(level)] * FFSIGN(level) * quantisation;

    } else

        return level * quantisation;

}

static inline void difference_coding(int16_t *band, int width, int height)

{

    for (int i = 0; i < height; i++) {

        for (int j = 1; j < width; j++) {

          band[j] += band[j-1];

        }

        band += width;

    }

}

static inline void peak_table(int16_t *band, Peak *peak, int length)

{

    for (int i = 0; i < length; i++)

        if (abs(band[i]) > peak->level)

            band[i] = bytestream2_get_le16(&peak->base);

}

static inline void process_alpha(int16_t *alpha, int width)

{

    for (int i = 0; i < width; i++) {

        int channel   = alpha[i];

        channel  -= ALPHA_COMPAND_DC_OFFSET;

        channel <<= 3;

        channel  *= ALPHA_COMPAND_GAIN;

        channel >>= 16;

        channel   = av_clip_uintp2(channel, 12);

        alpha[i]  = channel;

    }

}

static inline void process_bayer(AVFrame *frame, int bpc)

{

    const int linesize = frame->linesize[0];

    uint16_t *r = (uint16_t *)frame->data[0];

    uint16_t *g1 = (uint16_t *)(frame->data[0] + 2);

    uint16_t *g2 = (uint16_t *)(frame->data[0] + frame->linesize[0]);

    uint16_t *b = (uint16_t *)(frame->data[0] + frame->linesize[0] + 2);

    const int mid = 1 << (bpc - 1);

    const int factor = 1 << (16 - bpc);

    for (int y = 0; y < frame->height >> 1; y++) {

        for (int x = 0; x < frame->width; x += 2) {

            int R, G1, G2, B;

            int g, rg, bg, gd;

            g  = r[x];

            rg = g1[x];

            bg = g2[x];

            gd = b[x];

            gd -= mid;

            R  = (rg - mid) * 2 + g;

            G1 = g + gd;

            G2 = g - gd;

            B  = (bg - mid) * 2 + g;

            R  = av_clip_uintp2(R  * factor, 16);

            G1 = av_clip_uintp2(G1 * factor, 16);

            G2 = av_clip_uintp2(G2 * factor, 16);

            B  = av_clip_uintp2(B  * factor, 16);

            r[x]  = R;

            g1[x] = G1;

            g2[x] = G2;

            b[x]  = B;

        }

        r  += linesize;

        g1 += linesize;

        g2 += linesize;

        b  += linesize;

    }

}

static inline void interlaced_vertical_filter(int16_t *output, int16_t *low, int16_t *high,

                         int width, int linesize, int plane)

{

    for (int i = 0; i < width; i++) {

        int16_t even = (low[i] - high[i])/2;

        int16_t odd  = (low[i] + high[i])/2;

        output[i]            = av_clip_uintp2(even, 10);

        output[i + linesize] = av_clip_uintp2(odd, 10);

    }

}

static inline void inverse_temporal_filter(int16_t *low, int16_t *high, int width)

{

    for (int i = 0; i < width; i++) {

        int even = (low[i] - high[i]) / 2;

        int odd  = (low[i] + high[i]) / 2;

        low[i]  = even;

        high[i] = odd;

    }

}

static void free_buffers(CFHDContext *s)

{

    for (size_t i = 0; i < FF_ARRAY_ELEMS(s->plane); i++) {

        Plane *p = &s->plane[i];

        av_freep(&s->plane[i].idwt_buf);

        av_freep(&s->plane[i].idwt_tmp);

        s->plane[i].idwt_size = 0;

        for (int j = 0; j < SUBBAND_COUNT_3D; j++)

            s->plane[i].subband[j] = NULL;

        for (int j = 0; j < 10; j++)

            s->plane[i].l_h[j] = NULL;

        for (int j = 0; j < DWT_LEVELS_3D; j++)

            for (unsigned k = 0; k < FF_ARRAY_ELEMS(p->band[j]); k++) {

                p->band[j][k].a_width  = 0;

                p->band[j][k].a_height = 0;

                p->band[j][k].read_ok  = 0;

            }

    }

    s->a_height = 0;

    s->a_width  = 0;

    s->a_transform_type = INT_MIN;

}

static int alloc_buffers(AVCodecContext *avctx)

{

    CFHDContext *s = avctx->priv_data;

    int ret, planes, bayer = 0;

    int chroma_x_shift, chroma_y_shift;

    if ((ret = ff_set_dimensions(avctx, s->coded_width, s->coded_height)) < 0)

        return ret;

    avctx->pix_fmt = s->coded_format;

    ff_cfhddsp_init(&s->dsp, s->bpc, avctx->pix_fmt == AV_PIX_FMT_BAYER_RGGB16);

    if ((ret = av_pix_fmt_get_chroma_sub_sample(s->coded_format,

                                                &chroma_x_shift,

                                                &chroma_y_shift)) < 0)

        return ret;

    planes = av_pix_fmt_count_planes(s->coded_format);

    if (s->coded_format == AV_PIX_FMT_BAYER_RGGB16) {

        planes = 4;

        chroma_x_shift = 1;

        chroma_y_shift = 1;

        bayer = 1;

    }

    for (int i = 0; i < planes; i++) {

        int w8, h8, w4, h4, w2, h2;

        int width  = (i || bayer) ? s->coded_width  >> chroma_x_shift : s->coded_width;

        int height = (i || bayer) ? s->coded_height >> chroma_y_shift : s->coded_height;

        ptrdiff_t stride = (FFALIGN(width  / 8, 8) + 64) * 8;

        if ((ret = av_image_check_size2(stride, height, avctx->max_pixels, s->coded_format, 0, avctx)) < 0)

            return ret;

        if (chroma_y_shift && !bayer)

            height = FFALIGN(height / 8, 2) * 8;

        s->plane[i].width  = width;

        s->plane[i].height = height;

        s->plane[i].stride = stride;

        w8 = FFALIGN(s->plane[i].width  / 8, 8) + 64;

        h8 = FFALIGN(height, 8) / 8;

        w4 = w8 * 2;

        h4 = h8 * 2;

        w2 = w4 * 2;

        h2 = h4 * 2;

        if (s->transform_type == 0) {

            s->plane[i].idwt_size = FFALIGN(height, 8) * stride;

            s->plane[i].idwt_buf =

                av_calloc(s->plane[i].idwt_size, sizeof(*s->plane[i].idwt_buf));

            s->plane[i].idwt_tmp =

                av_malloc_array(s->plane[i].idwt_size, sizeof(*s->plane[i].idwt_tmp));

        } else {

            s->plane[i].idwt_size = FFALIGN(height, 8) * stride * 2;

            s->plane[i].idwt_buf =

                av_calloc(s->plane[i].idwt_size, sizeof(*s->plane[i].idwt_buf));

            s->plane[i].idwt_tmp =

                av_malloc_array(s->plane[i].idwt_size, sizeof(*s->plane[i].idwt_tmp));

        }

        if (!s->plane[i].idwt_buf || !s->plane[i].idwt_tmp)

            return AVERROR(ENOMEM);

        s->plane[i].subband[0] = s->plane[i].idwt_buf;

        s->plane[i].subband[1] = s->plane[i].idwt_buf + 2 * w8 * h8;

        s->plane[i].subband[2] = s->plane[i].idwt_buf + 1 * w8 * h8;

        s->plane[i].subband[3] = s->plane[i].idwt_buf + 3 * w8 * h8;

        s->plane[i].subband[4] = s->plane[i].idwt_buf + 2 * w4 * h4;

        s->plane[i].subband[5] = s->plane[i].idwt_buf + 1 * w4 * h4;

        s->plane[i].subband[6] = s->plane[i].idwt_buf + 3 * w4 * h4;

        if (s->transform_type == 0) {

            s->plane[i].subband[7] = s->plane[i].idwt_buf + 2 * w2 * h2;

            s->plane[i].subband[8] = s->plane[i].idwt_buf + 1 * w2 * h2;

            s->plane[i].subband[9] = s->plane[i].idwt_buf + 3 * w2 * h2;

        } else {

            int16_t *frame2 =

            s->plane[i].subband[7]  = s->plane[i].idwt_buf + 4 * w2 * h2;

            s->plane[i].subband[8]  = frame2 + 2 * w4 * h4;

            s->plane[i].subband[9]  = frame2 + 1 * w4 * h4;

            s->plane[i].subband[10] = frame2 + 3 * w4 * h4;

            s->plane[i].subband[11] = frame2 + 2 * w2 * h2;

            s->plane[i].subband[12] = frame2 + 1 * w2 * h2;

            s->plane[i].subband[13] = frame2 + 3 * w2 * h2;

            s->plane[i].subband[14] = s->plane[i].idwt_buf + 2 * w2 * h2;

            s->plane[i].subband[15] = s->plane[i].idwt_buf + 1 * w2 * h2;

            s->plane[i].subband[16] = s->plane[i].idwt_buf + 3 * w2 * h2;

        }

        if (s->transform_type == 0) {

            for (int j = 0; j < DWT_LEVELS; j++) {

                for (unsigned k = 0; k < FF_ARRAY_ELEMS(s->plane[i].band[j]); k++) {

                    s->plane[i].band[j][k].a_width  = w8 << j;

                    s->plane[i].band[j][k].a_height = h8 << j;

                }

            }

        } else {

            for (int j = 0; j < DWT_LEVELS_3D; j++) {

                int t = j < 1 ? 0 : (j < 3 ? 1 : 2);

                for (unsigned k = 0; k < FF_ARRAY_ELEMS(s->plane[i].band[j]); k++) {

                    s->plane[i].band[j][k].a_width  = w8 << t;

                    s->plane[i].band[j][k].a_height = h8 << t;

                }

            }

        }

        /* ll2 and ll1 commented out because they are done in-place */

        s->plane[i].l_h[0] = s->plane[i].idwt_tmp;

        s->plane[i].l_h[1] = s->plane[i].idwt_tmp + 2 * w8 * h8;

        // s->plane[i].l_h[2] = ll2;

        s->plane[i].l_h[3] = s->plane[i].idwt_tmp;

        s->plane[i].l_h[4] = s->plane[i].idwt_tmp + 2 * w4 * h4;

        // s->plane[i].l_h[5] = ll1;

        s->plane[i].l_h[6] = s->plane[i].idwt_tmp;

        s->plane[i].l_h[7] = s->plane[i].idwt_tmp + 2 * w2 * h2;

        if (s->transform_type != 0) {

            int16_t *frame2 = s->plane[i].idwt_tmp + 4 * w2 * h2;

            s->plane[i].l_h[8] = frame2;

            s->plane[i].l_h[9] = frame2 + 2 * w2 * h2;

        }

    }

    s->a_transform_type = s->transform_type;

    s->a_height = s->coded_height;

    s->a_width  = s->coded_width;

    s->a_format = s->coded_format;

    return 0;

}

static int cfhd_decode(AVCodecContext *avctx, AVFrame *pic,

                       int *got_frame, AVPacket *avpkt)

{

    CFHDContext *s = avctx->priv_data;

    CFHDDSPContext *dsp = &s->dsp;

    GetByteContext gb;

    int ret = 0, got_buffer = 0;

    init_frame_defaults(s);

    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);

        int16_t *coeff_data;

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

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

        } else if (tag == SampleFlags) {

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

            s->progressive = data & 0x0001;

        } else if (tag == FrameType) {

            s->frame_type = data;

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

        } else if (abstag == VersionMajor) {

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

        } else if (abstag == VersionMinor) {

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

        } else if (abstag == VersionRevision) {

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

        } else if (abstag == VersionEdit) {

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

        } else if (abstag == Version) {

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

        } else if (tag == ImageWidth) {

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

            s->coded_width = data;

        } else if (tag == ImageHeight) {

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

            s->coded_height = data;

        } else if (tag == ChannelCount) {

            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;

                goto end;

            }

        } else if (tag == SubbandCount) {

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

            if (data != SUBBAND_COUNT && data != SUBBAND_COUNT_3D) {

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

                ret = AVERROR_PATCHWELCOME;

                goto end;

            }

        } else if (tag == ChannelNumber) {

            s->channel_num = data;

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

            init_plane_defaults(s);

        } else if (tag == SubbandNumber) {

            if (s->subband_num != 0 && data == 1 && (s->transform_type == 0 || s->transform_type == 2))  // hack

                s->level++;

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

            s->subband_num = data;

            if ((s->transform_type == 0 && s->level >= DWT_LEVELS) ||

                (s->transform_type == 2 && s->level >= DWT_LEVELS_3D)) {

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

                ret = AVERROR(EINVAL);

                goto end;

            }

            if (s->subband_num > 3) {

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

                ret = AVERROR(EINVAL);

                goto end;

            }

        } else if (tag == SubbandBand) {

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

            if ((s->transform_type == 0 && data >= SUBBAND_COUNT) ||

                (s->transform_type == 2 && data >= SUBBAND_COUNT_3D && data != 255)) {

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

                ret = AVERROR(EINVAL);

                goto end;

            }

            if (s->transform_type == 0 || s->transform_type == 2)

                s->subband_num_actual = data;

            else

                av_log(avctx, AV_LOG_WARNING, "Ignoring subband num actual %"PRIu16"\n", data);

        } else if (tag == LowpassPrecision)

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

        else if (tag == Quantization) {

            s->quantisation = data;

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

        } else if (tag == PrescaleTable) {

            for (int i = 0; i < 8; i++)

                s->prescale_table[i] = (data >> (14 - i * 2)) & 0x3;

            av_log(avctx, AV_LOG_DEBUG, "Prescale table: %x\n", data);

        } else if (tag == BandEncoding) {

            if (!data || data > 5) {

                av_log(avctx, AV_LOG_ERROR, "Invalid band encoding\n");

                ret = AVERROR(EINVAL);

                goto end;

            }

            s->band_encoding = data;

            av_log(avctx, AV_LOG_DEBUG, "Encode Method for Subband %d : %x\n", s->subband_num_actual, data);

        } else if (tag == LowpassWidth) {

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

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

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

        } else if (tag == LowpassHeight) {

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

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

        } else if (tag == SampleType) {

            s->sample_type = data;

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

        } else if (tag == TransformType) {

            if (data > 2) {

                av_log(avctx, AV_LOG_ERROR, "Invalid transform type\n");

                ret = AVERROR(EINVAL);

                goto end;

            } else if (data == 1) {

                av_log(avctx, AV_LOG_ERROR, "unsupported transform type\n");

                ret = AVERROR_PATCHWELCOME;

                goto end;

            }

            if (s->transform_type == -1) {

                s->transform_type = data;

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

            } else {

                av_log(avctx, AV_LOG_DEBUG, "Ignoring additional transform type %"PRIu16"\n", data);

            }

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

            if (abstag == 0x4001)

                s->peak.level = 0;

            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 == FrameIndex) {

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

            s->frame_index = data;

        } else if (tag == SampleIndexTable) {

            av_log(avctx, AV_LOG_DEBUG, "Sample index table - skipping %i values\n", data);

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

                av_log(avctx, AV_LOG_ERROR, "too many values (%d)\n", data);

                ret = AVERROR_INVALIDDATA;

                goto end;

            }

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

                uint32_t offset = bytestream2_get_be32(&gb);

                av_log(avctx, AV_LOG_DEBUG, "Offset = %"PRIu32"\n", offset);

            }

        } else if (tag == HighpassWidth) {

            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);

                goto end;

            }

            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 == HighpassHeight) {

            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);

                goto end;

            }

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

        } else if (tag == BandWidth) {

            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);

                goto end;

            }

            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 == BandHeight) {

            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);

                goto end;

            }

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

        } else if (tag == InputFormat) {

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

            if (s->coded_format == AV_PIX_FMT_NONE ||

                s->coded_format == AV_PIX_FMT_YUV422P10) {

                if (data >= 100 && data <= 105) {

                    s->coded_format = AV_PIX_FMT_BAYER_RGGB16;

                } else if (data >= 122 && data <= 128) {

                    s->coded_format = AV_PIX_FMT_GBRP12;

                } else if (data == 30) {

                    s->coded_format = AV_PIX_FMT_GBRAP12;

                } else {

                    s->coded_format = AV_PIX_FMT_YUV422P10;

                }

                s->planes = s->coded_format == AV_PIX_FMT_BAYER_RGGB16 ? 4 : av_pix_fmt_count_planes(s->coded_format);

            }

        } else if (tag == BandCodingFlags) {

            s->codebook = data & 0xf;

            s->difference_coding = (data >> 4) & 1;

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

        } else if (tag == Precision) {

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

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

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

                ret = AVERROR(EINVAL);

                goto end;

            }

            avctx->bits_per_raw_sample = s->bpc = data;

        } else if (tag == EncodedFormat) {

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

            if (data == 1) {

                s->coded_format = AV_PIX_FMT_YUV422P10;

            } else if (data == 2) {

                s->coded_format = AV_PIX_FMT_BAYER_RGGB16;

            } 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;

                goto end;

            }

            s->planes = data == 2 ? 4 : av_pix_fmt_count_planes(s->coded_format);

        } else if (tag == -DisplayHeight) {

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

            s->cropped_height = data;

        } else if (tag == -PeakOffsetLow) {

            s->peak.offset &= ~0xffff;

            s->peak.offset |= (data & 0xffff);

            s->peak.base    = gb;

            s->peak.level   = 0;

        } else if (tag == -PeakOffsetHigh) {

            s->peak.offset &= 0xffff;

            s->peak.offset |= (data & 0xffffU)<<16;

            s->peak.base    = gb;

            s->peak.level   = 0;

        } else if (tag == -PeakLevel && s->peak.offset) {

            s->peak.level = data;

            if (s->peak.offset < 4 - bytestream2_tell(&s->peak.base) ||

                s->peak.offset > 4 + bytestream2_get_bytes_left(&s->peak.base)

            ) {

                ret = AVERROR_INVALIDDATA;

                goto end;

            }

            bytestream2_seek(&s->peak.base, s->peak.offset - 4, SEEK_CUR);

        } else

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

        if (s->channel_num >= s->planes) {

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

            ret = AVERROR(EINVAL);

            goto end;

        }

        if (got_buffer && (s->coded_width || s->coded_height || s->coded_format != AV_PIX_FMT_NONE)) {

            av_log(avctx, AV_LOG_ERROR, "Header tag after end of header\n");

            ret = AVERROR(EINVAL);

            goto end;

        }

        if (tag == BitstreamMarker && data == CoefficientSegment &&

            s->coded_format != AV_PIX_FMT_NONE) {

            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 factor = s->coded_format == AV_PIX_FMT_BAYER_RGGB16 ? 2 : 1;

            if (s->coded_width) {

                s->coded_width *= factor;

            }

            if (s->coded_height) {

                s->coded_height *= factor;

            }

            if (!s->a_width && !s->coded_width) {

                s->coded_width = lowpass_width * factor * 8;

            }

            if (!s->a_height && !s->coded_height) {

                s->coded_height = lowpass_height * factor * 8;

            }

            if (s->a_width && !s->coded_width)

                s->coded_width = s->a_width;

            if (s->a_height && !s->coded_height)

                s->coded_height = s->a_height;

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

                s->a_format != s->coded_format ||

                s->transform_type != s->a_transform_type) {

                free_buffers(s);

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

                    free_buffers(s);

                    return ret;

                }

            }

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

            if (ret < 0)

                return ret;

            avctx->pix_fmt = s->coded_format;

            if (s->cropped_height) {

                unsigned height = s->cropped_height << (avctx->pix_fmt == AV_PIX_FMT_BAYER_RGGB16);

                if (avctx->height < height)

                    return AVERROR_INVALIDDATA;

                avctx->height = height;

            }

            pic->width = pic->height = 0;

            if ((ret = ff_thread_get_buffer(avctx, pic, 0)) < 0)

                return ret;

            s->coded_width = 0;

            s->coded_height = 0;

            s->coded_format = AV_PIX_FMT_NONE;

            got_buffer = 1;

        } else if (tag == FrameIndex && data == 1 && s->sample_type == 1 && s->frame_type == 2) {

            pic->width = pic->height = 0;

            if ((ret = ff_thread_get_buffer(avctx, pic, 0)) < 0)

                return ret;

            s->coded_width = 0;

            s->coded_height = 0;

            s->coded_format = AV_PIX_FMT_NONE;

            got_buffer = 1;

        }

        if (s->subband_num_actual == 255)

            goto finish;

        if (tag == BitstreamMarker && data == CoefficientSegment || tag == BandHeader || tag == BandSecondPass || s->peak.level)

            if (s->transform_type != s->a_transform_type)

                return AVERROR_PATCHWELCOME;

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

        /* Lowpass coefficients */

        if (tag == BitstreamMarker && data == CoefficientSegment) {

            int lowpass_height, lowpass_width, lowpass_a_height, lowpass_a_width;

            if (!s->a_width || !s->a_height) {

                ret = AVERROR_INVALIDDATA;

                goto end;

            }

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

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

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

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

            if (lowpass_width < 3 ||

                lowpass_width > lowpass_a_width) {

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

                ret = AVERROR(EINVAL);

                goto end;

            }

            if (lowpass_height < 3 ||

                lowpass_height > lowpass_a_height) {

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

            }

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

                lowpass_width * lowpass_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 (int i = 0; i < lowpass_height; i++) {

                for (int 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));

            }

            s->plane[s->channel_num].band[0][0].read_ok = 1;

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

        }

        av_assert0(s->subband_num_actual != 255);

        if (tag == BandHeader || tag == BandSecondPass) {

            int highpass_height, highpass_width, highpass_a_width, highpass_a_height, highpass_stride, a_expected;

            int expected;

            GetBitContext gbit;

            int count = 0, bytes;

            if (!s->a_width || !s->a_height) {

                ret = AVERROR_INVALIDDATA;

                goto end;

            }

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

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

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

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

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

            a_expected = highpass_a_height * highpass_a_width;

            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);

            ret = init_get_bits8(&gbit, gb.buffer, bytestream2_get_bytes_left(&gb));

            if (ret < 0)

                goto end;

            {

                OPEN_READER(re, &gbit);

                const int lossless = s->band_encoding == 5;

                if (s->codebook == 0 && s->transform_type == 2 && s->subband_num_actual == 7)

                    s->codebook = 1;

                if (!s->codebook) {

                    while (1) {

                        int level, run, coeff;

                        UPDATE_CACHE(re, &gbit);

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

                                   VLC_BITS, 3, 1);

                        /* escape */

                        if (!run)

                            break;

                        count += run;

                        if (count > expected)

                            break;

                        if (!lossless)

                            coeff = dequant_and_decompand(s, level, s->quantisation, 0);

                        else

                            coeff = level;

                        if (tag == BandSecondPass) {

                            const uint16_t q = s->quantisation;

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

                                *coeff_data |= coeff * 256U;

                                *coeff_data++ *= q;

                            }

                        } else {

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

                                *coeff_data++ = coeff;

                        }

                    }

                } else {

                    while (1) {

                        int level, run, coeff;

                        UPDATE_CACHE(re, &gbit);

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

                                   VLC_BITS, 3, 1);

                        /* escape */

                        if (!run)

                            break;

                        count += run;

                        if (count > expected)

                            break;

                        if (!lossless)

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

                        else

                            coeff = level;

                        if (tag == BandSecondPass) {

                            const uint16_t q = s->quantisation;

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

                                *coeff_data |= coeff * 256U;

                                *coeff_data++ *= q;

                            }

                        } else {

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

                                *coeff_data++ = coeff;

                        }

                    }

                }

                CLOSE_READER(re, &gbit);

            }

            if (count > expected) {

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

                ret = AVERROR(EINVAL);

                goto end;

            }

            if (s->peak.level)

                peak_table(coeff_data - count, &s->peak, count);

            if (s->difference_coding)

                difference_coding(s->plane[s->channel_num].subband[s->subband_num_actual], highpass_width, highpass_height);

            bytes = FFALIGN(AV_CEIL_RSHIFT(get_bits_count(&gbit), 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->plane[s->channel_num].band[s->level][s->subband_num].read_ok = 1;

finish:

            if (s->subband_num_actual != 255)

                s->codebook = 0;

        }

    }

    s->planes = av_pix_fmt_count_planes(avctx->pix_fmt);

    if (avctx->pix_fmt == AV_PIX_FMT_BAYER_RGGB16) {

        s->progressive = 1;

        s->planes = 4;

    }

    ff_thread_finish_setup(avctx);

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

        s->a_transform_type == INT_MIN) {

        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;

    }

    for (int plane = 0; plane < s->planes; plane++) {

        for (int level = 0; level < (s->transform_type == 0 ? DWT_LEVELS : DWT_LEVELS_3D) ; level++) {

            if (s->transform_type == 2)

                if (level == 2 || level == 5)

                    continue;

            for (int o = !!level; o < 4 ; o++) {

                if (!s->plane[plane].band[level][o].read_ok) {

                    ret = AVERROR_INVALIDDATA;

                    goto end;

                }

            }

        }

    }

    if (s->transform_type == 0 && s->sample_type != 1) {

        for (int plane = 0; plane < s->planes && !ret; plane++) {

            /* level 1 */

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

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

            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;

            ptrdiff_t dst_linesize;

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

            if (avctx->pix_fmt == AV_PIX_FMT_BAYER_RGGB16) {

                act_plane = 0;

                dst_linesize = pic->linesize[act_plane];

            } else {

                dst_linesize = pic->linesize[act_plane] / 2;

            }

            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 ||

                lowpass_width < 3 || lowpass_height < 3) {

                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];

            dsp->vert_filter(output, output_stride, low, lowpass_width, high, highpass_stride, lowpass_width, lowpass_height);

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

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

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