/*
  * 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/buffer.h"
 #include "libavutil/common.h"
 #include "libavutil/imgutils.h"

 #include "libavutil/intreadwrite.h"

 #include "libavutil/opt.h"
 
 #include "avcodec.h"
 #include "bytestream.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
 

 enum CFHDParam {
     ChannelCount     =  12,
     SubbandCount     =  14,
     ImageWidth       =  20,
     ImageHeight      =  21,
     LowpassPrecision =  35,
     SubbandNumber    =  48,
     Quantization     =  53,
     ChannelNumber    =  62,
     BitsPerComponent = 101,
     ChannelWidth     = 104,
     ChannelHeight    = 105,
     PrescaleShift    = 109,
 };

 static av_cold int cfhd_init(AVCodecContext *avctx)

 {
     CFHDContext *s = avctx->priv_data;
 
     avctx->bits_per_raw_sample = 10;
     s->avctx                   = avctx;
 
     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_frame_defaults(CFHDContext *s)
 {
     s->coded_width       = 0;
     s->coded_height      = 0;

     s->cropped_height    = 0;

     s->bpc               = 10;
     s->channel_cnt       = 4;

     s->subband_cnt       = SUBBAND_COUNT;

     s->channel_num       = 0;
     s->lowpass_precision = 16;
     s->quantisation      = 1;
     s->wavelet_depth     = 3;
     s->pshift            = 1;
     s->codebook          = 0;
     init_plane_defaults(s);
 }
 
 /* TODO: merge with VLC tables or use LUT */
 static inline int dequant_and_decompand(int level, int quantisation)
 {
     int64_t abslevel = abs(level);

     return (abslevel + ((768 * abslevel * abslevel * abslevel) / (255 * 255 * 255))) *
            FFSIGN(level) * quantisation;

 }
 

 static inline void process_alpha(int16_t *alpha, int width)
 {
     int i, channel;
     for (i = 0; i < width; i++) {
         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 filter(int16_t *output, ptrdiff_t out_stride,
                           int16_t *low, ptrdiff_t low_stride,
                           int16_t *high, ptrdiff_t high_stride,
                           int len, int clip)

 {
     int16_t tmp;
     int i;

     for (i = 0; i < len; i++) {
         if (i == 0) {
             tmp = (11*low[0*low_stride] - 4*low[1*low_stride] + low[2*low_stride] + 4) >> 3;
             output[(2*i+0)*out_stride] = (tmp + high[0*high_stride]) >> 1;
             if (clip)
                 output[(2*i+0)*out_stride] = av_clip_uintp2_c(output[(2*i+0)*out_stride], clip);
 
             tmp = ( 5*low[0*low_stride] + 4*low[1*low_stride] - low[2*low_stride] + 4) >> 3;
             output[(2*i+1)*out_stride] = (tmp - high[0*high_stride]) >> 1;
             if (clip)
                 output[(2*i+1)*out_stride] = av_clip_uintp2_c(output[(2*i+1)*out_stride], clip);
         } else if (i == len-1) {
             tmp = ( 5*low[i*low_stride] + 4*low[(i-1)*low_stride] - low[(i-2)*low_stride] + 4) >> 3;
             output[(2*i+0)*out_stride] = (tmp + high[i*high_stride]) >> 1;
             if (clip)
                 output[(2*i+0)*out_stride] = av_clip_uintp2_c(output[(2*i+0)*out_stride], clip);
 
             tmp = (11*low[i*low_stride] - 4*low[(i-1)*low_stride] + low[(i-2)*low_stride] + 4) >> 3;
             output[(2*i+1)*out_stride] = (tmp - high[i*high_stride]) >> 1;
             if (clip)
                 output[(2*i+1)*out_stride] = av_clip_uintp2_c(output[(2*i+1)*out_stride], clip);
         } else {
             tmp = (low[(i-1)*low_stride] - low[(i+1)*low_stride] + 4) >> 3;
             output[(2*i+0)*out_stride] = (tmp + low[i*low_stride] + high[i*high_stride]) >> 1;
             if (clip)
                 output[(2*i+0)*out_stride] = av_clip_uintp2_c(output[(2*i+0)*out_stride], clip);
 
             tmp = (low[(i+1)*low_stride] - low[(i-1)*low_stride] + 4) >> 3;
             output[(2*i+1)*out_stride] = (tmp + low[i*low_stride] - high[i*high_stride]) >> 1;
             if (clip)
                 output[(2*i+1)*out_stride] = av_clip_uintp2_c(output[(2*i+1)*out_stride], clip);
         }
     }
 }
 

 static void horiz_filter(int16_t *output, int16_t *low, int16_t *high,
                          int width)

 {
     filter(output, 1, low, 1, high, 1, width, 0);
 }
 

 static void horiz_filter_clip(int16_t *output, int16_t *low, int16_t *high,
                               int width, int clip)

 {
     filter(output, 1, low, 1, high, 1, width, clip);
 }
 

 static void vert_filter(int16_t *output, ptrdiff_t out_stride,
                         int16_t *low, ptrdiff_t low_stride,
                         int16_t *high, ptrdiff_t high_stride, int len)

 {
     filter(output, out_stride, low, low_stride, high, high_stride, len, 0);
 }
 

 static void free_buffers(CFHDContext *s)

 {

     int i, j;

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

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

 
         for (j = 0; j < 9; j++)
             s->plane[i].subband[j] = NULL;
 
         for (j = 0; j < 8; j++)
             s->plane[i].l_h[j] = NULL;

     }
     s->a_height = 0;
     s->a_width  = 0;
 }
 
 static int alloc_buffers(AVCodecContext *avctx)
 {
     CFHDContext *s = avctx->priv_data;

     int i, j, ret, planes;
     int chroma_x_shift, chroma_y_shift;
     unsigned k;

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

     avctx->pix_fmt = s->coded_format;

     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);

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

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

         int width  = i ? avctx->width  >> chroma_x_shift : avctx->width;
         int height = i ? avctx->height >> chroma_y_shift : avctx->height;

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

         if (chroma_y_shift)
             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);

         h8 = height / 8;

         w4 = w8 * 2;
         h4 = h8 * 2;
         w2 = w4 * 2;
         h2 = h4 * 2;
 

         s->plane[i].idwt_buf =

             av_mallocz_array(height * stride, sizeof(*s->plane[i].idwt_buf));

         s->plane[i].idwt_tmp =
             av_malloc_array(height * stride, 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;
         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;
 
         for (j = 0; j < DWT_LEVELS; j++) {

             for (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;
             }
         }
 
         /* 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;
     }
 
     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, 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 == 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 == 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 == 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;
                 break;
             }

         } else if (tag == SubbandCount) {

             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 == ChannelNumber) {

             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 == SubbandNumber) {

             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 == 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 == PrescaleShift) {

             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].a_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 if (tag == -85) {
             av_log(avctx, AV_LOG_DEBUG, "Cropped height %"PRIu16"\n", data);
             s->cropped_height = data;

         } 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(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;

             if (s->cropped_height)
                 avctx->height = s->cropped_height;

             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);

             if (act_plane == 3)
                 process_alpha(dst, lowpass_width * 2);

             low  += lowpass_width;
             high += lowpass_width;
             dst  += pic->linesize[act_plane] / 2;
         }
     }
 
 
 end:
     if (ret < 0)
         return ret;
 
     *got_frame = 1;
     return avpkt->size;
 }
 

 static av_cold int cfhd_close(AVCodecContext *avctx)

 {
     CFHDContext *s = avctx->priv_data;
 

     free_buffers(s);

 
     if (!avctx->internal->is_copy) {
         ff_free_vlc(&s->vlc_9);
         ff_free_vlc(&s->vlc_18);
     }
 
     return 0;
 }
 
 AVCodec ff_cfhd_decoder = {

     .name             = "cfhd",
     .long_name        = NULL_IF_CONFIG_SMALL("Cineform HD"),
     .type             = AVMEDIA_TYPE_VIDEO,
     .id               = AV_CODEC_ID_CFHD,
     .priv_data_size   = sizeof(CFHDContext),
     .init             = cfhd_init,
     .close            = cfhd_close,
     .decode           = cfhd_decode,
     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
     .caps_internal    = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,

 };