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   1 /*
   2  * Copyright (c) 2015-2016 Kieran Kunhya <kieran@kunhya.com>
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * Libav is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with Libav; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /**
  22  * @file
  23  * Cineform HD video decoder
  24  */
  25
  26 #include "libavutil/attributes.h"
  27 #include "libavutil/buffer.h"
  28 #include "libavutil/common.h"
  29 #include "libavutil/imgutils.h"
  30 #include "libavutil/intreadwrite.h"
  31 #include "libavutil/opt.h"
  32
  33 #include "avcodec.h"
  34 #include "bitstream.h"
  35 #include "bytestream.h"
  36 #include "internal.h"
  37 #include "thread.h"
  38 #include "cfhd.h"
  39
  40 enum CFHDParam {
  41     ChannelCount     =  12,
  42     SubbandCount     =  14,
  43     ImageWidth       =  20,
  44     ImageHeight      =  21,
  45     LowpassPrecision =  35,
  46     SubbandNumber    =  48,
  47     Quantization     =  53,
  48     ChannelNumber    =  62,
  49     BitsPerComponent = 101,
  50     ChannelWidth     = 104,
  51     ChannelHeight    = 105,
  52     PrescaleShift    = 109,
  53 };
  54
  55 static av_cold int cfhd_init(AVCodecContext *avctx)
  56 {
  57     CFHDContext *s = avctx->priv_data;
  58
  59     memset(s, 0, sizeof(*s));
  60
  61     s->avctx                   = avctx;
  62     avctx->bits_per_raw_sample = 10;
  63
  64     return ff_cfhd_init_vlcs(s);
  65 }
  66
  67 static void init_plane_defaults(CFHDContext *s)
  68 {
  69     s->subband_num        = 0;
  70     s->level              = 0;
  71     s->subband_num_actual = 0;
  72 }
  73
  74 static void init_frame_defaults(CFHDContext *s)
  75 {
  76     s->coded_format      = AV_PIX_FMT_YUV422P10;
  77     s->coded_width       = 0;
  78     s->coded_height      = 0;
  79     s->cropped_height    = 0;
  80     s->bpc               = 10;
  81     s->channel_cnt       = 4;
  82     s->subband_cnt       = SUBBAND_COUNT;
  83     s->channel_num       = 0;
  84     s->lowpass_precision = 16;
  85     s->quantisation      = 1;
  86     s->prescale_shift[0] = 0;
  87     s->prescale_shift[1] = 0;
  88     s->prescale_shift[2] = 0;
  89     s->wavelet_depth     = 3;
  90     s->pshift            = 1;
  91     s->codebook          = 0;
  92     init_plane_defaults(s);
  93 }
  94
  95 /* TODO: merge with VLC tables or use LUT */
  96 static inline int dequant_and_decompand(int level, int quantisation)
  97 {
  98     int64_t abslevel = abs(level);
  99     return (abslevel + ((768 * abslevel * abslevel * abslevel) / (255 * 255 * 255))) *
 100            FFSIGN(level) * quantisation;
 101 }
 102
 103 static inline void filter(int16_t *output, ptrdiff_t out_stride,
 104                           int16_t *low, ptrdiff_t low_stride,
 105                           int16_t *high, ptrdiff_t high_stride,
 106                           int len, int clip)
 107 {
 108     int16_t tmp;
 109     int i;
 110
 111     for (i = 0; i < len; i++) {
 112         if (i == 0) {
 113             tmp = (11 * low[0 * low_stride] - 4 * low[1 * low_stride] + low[2 * low_stride] + 4) >> 3;
 114             output[(2 * i + 0) * out_stride] = (tmp + high[0 * high_stride]) >> 1;
 115         } else if (i == len - 1) {
 116             tmp = (5 * low[i * low_stride] + 4 * low[(i - 1) * low_stride] - low[(i - 2) * low_stride] + 4) >> 3;
 117             output[(2 * i + 0) * out_stride] = (tmp + high[i * high_stride]) >> 1;
 118         } else {
 119             tmp = (low[(i - 1) * low_stride] - low[(i + 1) * low_stride] + 4) >> 3;
 120             output[(2 * i + 0) * out_stride] = (tmp + low[i * low_stride] + high[i * high_stride]) >> 1;
 121         }
 122         if (clip)
 123             output[(2 * i + 0) * out_stride] = av_clip_uintp2_c(output[(2 * i + 0) * out_stride], clip);
 124
 125         if (i == 0) {
 126             tmp = (5 * low[0 * low_stride] + 4 * low[1 * low_stride] - low[2 * low_stride] + 4) >> 3;
 127             output[(2 * i + 1) * out_stride] = (tmp - high[0 * high_stride]) >> 1;
 128         } else if (i == len - 1) {
 129             tmp = (11 * low[i * low_stride] - 4 * low[(i - 1) * low_stride] + low[(i - 2) * low_stride] + 4) >> 3;
 130             output[(2 * i + 1) * out_stride] = (tmp - high[i * high_stride]) >> 1;
 131         } else {
 132             tmp = (low[(i + 1) * low_stride] - low[(i - 1) * low_stride] + 4) >> 3;
 133             output[(2 * i + 1) * out_stride] = (tmp + low[i * low_stride] - high[i * high_stride]) >> 1;
 134         }
 135         if (clip)
 136             output[(2 * i + 1) * out_stride] = av_clip_uintp2_c(output[(2 * i + 1) * out_stride], clip);
 137     }
 138 }
 139
 140 static void horiz_filter(int16_t *output, int16_t *low, int16_t *high,
 141                          int width)
 142 {
 143     filter(output, 1, low, 1, high, 1, width, 0);
 144 }
 145
 146 static void horiz_filter_clip(int16_t *output, int16_t *low, int16_t *high,
 147                               int width, int clip)
 148 {
 149     filter(output, 1, low, 1, high, 1, width, clip);
 150 }
 151
 152 static void vert_filter(int16_t *output, ptrdiff_t out_stride,
 153                         int16_t *low, ptrdiff_t low_stride,
 154                         int16_t *high, ptrdiff_t high_stride, int len)
 155 {
 156     filter(output, out_stride, low, low_stride, high, high_stride, len, 0);
 157 }
 158
 159 static void free_buffers(CFHDContext *s)
 160 {
 161     unsigned i;
 162
 163     for (i = 0; i < FF_ARRAY_ELEMS(s->plane); i++) {
 164         av_freep(&s->plane[i].idwt_buf);
 165         av_freep(&s->plane[i].idwt_tmp);
 166     }
 167     s->a_height = 0;
 168     s->a_width  = 0;
 169 }
 170
 171 static int alloc_buffers(CFHDContext *s)
 172 {
 173     int i, j, ret, planes;
 174     int chroma_x_shift, chroma_y_shift;
 175     unsigned k;
 176
 177     if ((ret = av_pix_fmt_get_chroma_sub_sample(s->coded_format,
 178                                                 &chroma_x_shift,
 179                                                 &chroma_y_shift)) < 0)
 180         return ret;
 181     planes = av_pix_fmt_count_planes(s->coded_format);
 182
 183     for (i = 0; i < planes; i++) {
 184         int w8, h8, w4, h4, w2, h2;
 185         int width  = i ? s->coded_width  >> chroma_x_shift : s->coded_width;
 186         int height = i ? s->coded_height >> chroma_y_shift : s->coded_height;
 187         ptrdiff_t stride = FFALIGN(width  / 8, 8) * 8;
 188         height           = FFALIGN(height / 8, 2) * 8;
 189         s->plane[i].width  = width;
 190         s->plane[i].height = height;
 191         s->plane[i].stride = stride;
 192
 193         w8 = FFALIGN(s->plane[i].width  / 8, 8);
 194         h8 = FFALIGN(s->plane[i].height / 8, 2);
 195         w4 = w8 * 2;
 196         h4 = h8 * 2;
 197         w2 = w4 * 2;
 198         h2 = h4 * 2;
 199
 200         s->plane[i].idwt_buf =
 201             av_malloc_array(height * stride, sizeof(*s->plane[i].idwt_buf));
 202         s->plane[i].idwt_tmp =
 203             av_malloc_array(height * stride, sizeof(*s->plane[i].idwt_tmp));
 204         if (!s->plane[i].idwt_buf || !s->plane[i].idwt_tmp)
 205             return AVERROR(ENOMEM);
 206
 207         s->plane[i].subband[0] = s->plane[i].idwt_buf;
 208         s->plane[i].subband[1] = s->plane[i].idwt_buf + 2 * w8 * h8;
 209         s->plane[i].subband[2] = s->plane[i].idwt_buf + 1 * w8 * h8;
 210         s->plane[i].subband[3] = s->plane[i].idwt_buf + 3 * w8 * h8;
 211         s->plane[i].subband[4] = s->plane[i].idwt_buf + 2 * w4 * h4;
 212         s->plane[i].subband[5] = s->plane[i].idwt_buf + 1 * w4 * h4;
 213         s->plane[i].subband[6] = s->plane[i].idwt_buf + 3 * w4 * h4;
 214         s->plane[i].subband[7] = s->plane[i].idwt_buf + 2 * w2 * h2;
 215         s->plane[i].subband[8] = s->plane[i].idwt_buf + 1 * w2 * h2;
 216         s->plane[i].subband[9] = s->plane[i].idwt_buf + 3 * w2 * h2;
 217
 218         for (j = 0; j < DWT_LEVELS; j++) {
 219             for (k = 0; k < FF_ARRAY_ELEMS(s->plane[i].band[j]); k++) {
 220                 s->plane[i].band[j][k].a_width  = w8 << j;
 221                 s->plane[i].band[j][k].a_height = h8 << j;
 222             }
 223         }
 224
 225         /* ll2 and ll1 commented out because they are done in-place */
 226         s->plane[i].l_h[0] = s->plane[i].idwt_tmp;
 227         s->plane[i].l_h[1] = s->plane[i].idwt_tmp + 2 * w8 * h8;
 228         // s->plane[i].l_h[2] = ll2;
 229         s->plane[i].l_h[3] = s->plane[i].idwt_tmp;
 230         s->plane[i].l_h[4] = s->plane[i].idwt_tmp + 2 * w4 * h4;
 231         // s->plane[i].l_h[5] = ll1;
 232         s->plane[i].l_h[6] = s->plane[i].idwt_tmp;
 233         s->plane[i].l_h[7] = s->plane[i].idwt_tmp + 2 * w2 * h2;
 234     }
 235
 236     s->a_height = s->coded_height;
 237     s->a_width  = s->coded_width;
 238     s->a_format = s->coded_format;
 239
 240     return 0;
 241 }
 242
 243 static int parse_tag(CFHDContext *s, GetByteContext *gb,
 244                      int16_t *tag_, uint16_t *value, int *planes)
 245 {
 246     /* Bit weird but implement the tag parsing as the spec says */
 247     uint16_t tagu   = bytestream2_get_be16(gb);
 248     int16_t tag     = tagu;
 249     int8_t tag8     = tagu >> 8;
 250     uint16_t abstag = abs(tag);
 251     int8_t abs_tag8 = abs(tag8);
 252     uint16_t data   = bytestream2_get_be16(gb);
 253     *tag_ = tag;
 254     *value = data;
 255
 256     if (abs_tag8 >= 0x60 && abs_tag8 <= 0x6F) {
 257         av_log(s->avctx, AV_LOG_DEBUG, "large len %"PRIX16"\n",
 258                ((tagu & 0xFF) << 16) | data);
 259         return 0;
 260     } else if (abstag >= 0x4000 && abstag <= 0x40FF) {
 261         av_log(s->avctx, AV_LOG_DEBUG, "Small chunk length %"PRIu16" %s\n",
 262                data * 4, tag < 0 ? "optional" : "required");
 263         bytestream2_skipu(gb, data * 4);
 264         return 0;
 265     }
 266
 267     switch (tag) {
 268     case 1:
 269         av_log(s->avctx, AV_LOG_DEBUG, "Sample type? %"PRIu16"\n", data);
 270         break;
 271     case 2:
 272     {
 273         int i;
 274         av_log(s->avctx, AV_LOG_DEBUG,
 275                "tag=2 header - skipping %"PRIu16" tag/value pairs\n", data);
 276         if (data > bytestream2_get_bytes_left(gb) / 4) {
 277             av_log(s->avctx, AV_LOG_ERROR,
 278                    "Too many tag/value pairs (%"PRIu16")\n", data);
 279             return AVERROR_INVALIDDATA;
 280         }
 281         for (i = 0; i < data; i++) {
 282             uint16_t tag2 = bytestream2_get_be16(gb);
 283             uint16_t val2 = bytestream2_get_be16(gb);
 284             av_log(s->avctx, AV_LOG_DEBUG, "Tag/Value = %"PRIX16" %"PRIX16"\n",
 285                    tag2, val2);
 286         }
 287         break;
 288     }
 289     case 10:
 290         if (data != 0) {
 291             avpriv_report_missing_feature(s->avctx, "Transform type %"PRIu16, data);
 292             return AVERROR_PATCHWELCOME;
 293         }
 294         av_log(s->avctx, AV_LOG_DEBUG, "Transform-type? %"PRIu16"\n", data);
 295         break;
 296     case ChannelCount:
 297         av_log(s->avctx, AV_LOG_DEBUG, "Channel count: %"PRIu16"\n", data);
 298         if (data > 4) {
 299             avpriv_report_missing_feature(s->avctx, "Channel count %"PRIu16, data);
 300             return AVERROR_PATCHWELCOME;
 301         }
 302         s->channel_cnt = data;
 303         break;
 304     case SubbandCount:
 305         av_log(s->avctx, AV_LOG_DEBUG, "Subband count: %"PRIu16"\n", data);
 306         if (data != SUBBAND_COUNT) {
 307             avpriv_report_missing_feature(s->avctx, "Subband count %"PRIu16, data);
 308             return AVERROR_PATCHWELCOME;
 309         }
 310         break;
 311     case ImageWidth:
 312         av_log(s->avctx, AV_LOG_DEBUG, "Width %"PRIu16"\n", data);
 313         s->coded_width = data;
 314         break;
 315     case ImageHeight:
 316         av_log(s->avctx, AV_LOG_DEBUG, "Height %"PRIu16"\n", data);
 317         s->coded_height = data;
 318         break;
 319     case 23:
 320         avpriv_report_missing_feature(s->avctx, "Skip frame");
 321         return AVERROR_PATCHWELCOME;
 322     case 27:
 323         av_log(s->avctx, AV_LOG_DEBUG, "Lowpass width %"PRIu16"\n", data);
 324         if (data < 2 || data > s->plane[s->channel_num].band[0][0].a_width) {
 325             av_log(s->avctx, AV_LOG_ERROR, "Invalid lowpass width\n");
 326             return AVERROR_INVALIDDATA;
 327         }
 328         s->plane[s->channel_num].band[0][0].width  = data;
 329         s->plane[s->channel_num].band[0][0].stride = data;
 330         break;
 331     case 28:
 332         av_log(s->avctx, AV_LOG_DEBUG, "Lowpass height %"PRIu16"\n", data);
 333         if (data < 2 || data > s->plane[s->channel_num].band[0][0].a_height) {
 334             av_log(s->avctx, AV_LOG_ERROR, "Invalid lowpass height\n");
 335             return AVERROR_INVALIDDATA;
 336         }
 337         s->plane[s->channel_num].band[0][0].height = data;
 338         break;
 339     case LowpassPrecision:
 340         av_log(s->avctx, AV_LOG_DEBUG, "Lowpass precision bits: %"PRIu16"\n", data);
 341         break;
 342     case 41:
 343     case 49:
 344         av_log(s->avctx, AV_LOG_DEBUG,
 345                "Highpass width%s %"PRIu16" channel %i level %i subband %i\n",
 346                tag == 49 ? "2" : "", data,
 347                s->channel_num, s->level, s->subband_num);
 348         if (data < 2) {
 349             av_log(s->avctx, AV_LOG_ERROR, "Invalid highpass width%s\n", tag == 49 ? "2" : "");
 350             return AVERROR_INVALIDDATA;
 351         }
 352         s->plane[s->channel_num].band[s->level][s->subband_num].width  = data;
 353         s->plane[s->channel_num].band[s->level][s->subband_num].stride = FFALIGN(data, 8);
 354         break;
 355     case 42:
 356     case 50:
 357         av_log(s->avctx, AV_LOG_DEBUG, "Highpass height%s %"PRIu16"\n", tag == 50 ? "2" : "", data);
 358         if (data < 2) {
 359             av_log(s->avctx, AV_LOG_ERROR, "Invalid highpass height%s\n", tag == 50 ? "2" : "");
 360             return AVERROR_INVALIDDATA;
 361         }
 362         s->plane[s->channel_num].band[s->level][s->subband_num].height = data;
 363         break;
 364     case SubbandNumber:
 365         av_log(s->avctx, AV_LOG_DEBUG, "Subband number %"PRIu16"\n", data);
 366         if (data > 3) {
 367             av_log(s->avctx, AV_LOG_ERROR, "Invalid subband number\n");
 368             return AVERROR_INVALIDDATA;
 369         }
 370         if (s->subband_num != 0 && data == 1) {
 371             if (s->level + 1 >= DWT_LEVELS) {
 372                 av_log(s->avctx, AV_LOG_ERROR, "Invalid level\n");
 373                 return AVERROR_INVALIDDATA;
 374             }
 375
 376             s->level++;
 377         }
 378         s->subband_num = data;
 379         break;
 380     case 51:
 381         av_log(s->avctx, AV_LOG_DEBUG, "Subband number actual %"PRIu16"\n", data);
 382         if (data >= SUBBAND_COUNT) {
 383             av_log(s->avctx, AV_LOG_ERROR, "Invalid subband number actual\n");
 384             return AVERROR_INVALIDDATA;
 385         }
 386         s->subband_num_actual = data;
 387         break;
 388     case Quantization:
 389         s->quantisation = data;
 390         av_log(s->avctx, AV_LOG_DEBUG, "Quantisation: %"PRIu16"\n", data);
 391         break;
 392     case ChannelNumber:
 393         av_log(s->avctx, AV_LOG_DEBUG, "Channel number %"PRIu16"\n", data);
 394         if (data >= *planes) {
 395             av_log(s->avctx, AV_LOG_ERROR, "Invalid channel number\n");
 396             return AVERROR_INVALIDDATA;
 397         }
 398         s->channel_num = data;
 399         init_plane_defaults(s);
 400         break;
 401     case 70:
 402         av_log(s->avctx, AV_LOG_DEBUG,
 403                "Subsampling or bit-depth flag? %"PRIu16"\n", data);
 404         if (!(data == 10 || data == 12)) {
 405             av_log(s->avctx, AV_LOG_ERROR, "Invalid bits per channel\n");
 406             return AVERROR_INVALIDDATA;
 407         }
 408         s->bpc = data;
 409         break;
 410     case 71:
 411         s->codebook = data;
 412         av_log(s->avctx, AV_LOG_DEBUG, "Codebook %i\n", s->codebook);
 413         break;
 414     case 72:
 415         s->codebook = data;
 416         av_log(s->avctx, AV_LOG_DEBUG, "Other codebook? %i\n", s->codebook);
 417         break;
 418     case 84:
 419         av_log(s->avctx, AV_LOG_DEBUG, "Sample format? %"PRIu16"\n", data);
 420         switch (data) {
 421         case 1:
 422             s->coded_format = AV_PIX_FMT_YUV422P10;
 423             break;
 424         case 3:
 425             s->coded_format = AV_PIX_FMT_GBRP12;
 426             break;
 427         case 4:
 428             s->coded_format = AV_PIX_FMT_GBRAP12;
 429             break;
 430         default:
 431             avpriv_report_missing_feature(s->avctx, "Sample format %"PRIu16, data);
 432             return AVERROR_PATCHWELCOME;
 433         }
 434         *planes = av_pix_fmt_count_planes(s->coded_format);
 435         break;
 436     case -85:
 437         av_log(s->avctx, AV_LOG_DEBUG, "Cropped height %"PRIu16"\n", data);
 438         s->cropped_height = data;
 439         break;
 440     case 101:
 441         av_log(s->avctx, AV_LOG_DEBUG, "Bits per component: %"PRIu16"\n", data);
 442         s->bpc = data;
 443         break;
 444     case PrescaleShift:
 445         s->prescale_shift[0] = (data >> 0) & 0x7;
 446         s->prescale_shift[1] = (data >> 3) & 0x7;
 447         s->prescale_shift[2] = (data >> 6) & 0x7;
 448         av_log(s->avctx, AV_LOG_DEBUG, "Prescale shift (VC-5): %"PRIX16"\n", data);
 449         break;
 450     default:
 451         av_log(s->avctx, AV_LOG_DEBUG, "Unknown tag %"PRIu16" data %"PRIX16"\n",
 452                tag, data);
 453     }
 454
 455     return 0;
 456 }
 457
 458 static int read_lowpass_coeffs(CFHDContext *s, GetByteContext *gb,
 459                                int16_t *coeff_data)
 460 {
 461     int i, j;
 462     int lowpass_height   = s->plane[s->channel_num].band[0][0].height;
 463     int lowpass_width    = s->plane[s->channel_num].band[0][0].width;
 464     int lowpass_a_height = s->plane[s->channel_num].band[0][0].a_height;
 465     int lowpass_a_width  = s->plane[s->channel_num].band[0][0].a_width;
 466
 467     if (lowpass_height > lowpass_a_height ||
 468         lowpass_width  > lowpass_a_width  ||
 469         lowpass_a_width * lowpass_a_height * sizeof(*coeff_data) > bytestream2_get_bytes_left(gb)) {
 470         av_log(s->avctx, AV_LOG_ERROR, "Too many lowpass coefficients\n");
 471         return AVERROR_INVALIDDATA;
 472     }
 473
 474     av_log(s->avctx, AV_LOG_DEBUG,
 475            "Start of lowpass coeffs component %d height:%d, width:%d\n",
 476            s->channel_num, lowpass_height, lowpass_width);
 477     for (i = 0; i < lowpass_height; i++) {
 478         for (j = 0; j < lowpass_width; j++)
 479             coeff_data[j] = bytestream2_get_be16u(gb);
 480
 481         coeff_data += lowpass_width;
 482     }
 483
 484     /* Align to mod-4 position to continue reading tags */
 485     bytestream2_seek(gb, bytestream2_tell(gb) & 3, SEEK_CUR);
 486
 487     /* Copy last coefficient line if height is odd. */
 488     if (lowpass_height & 1) {
 489         int16_t *last_line = &coeff_data[lowpass_height * lowpass_width];
 490         memcpy(last_line, &last_line[-lowpass_width],
 491                lowpass_width * sizeof(*coeff_data));
 492     }
 493
 494     av_log(s->avctx, AV_LOG_DEBUG, "Lowpass coefficients %i\n",
 495            lowpass_width * lowpass_height);
 496
 497     return 0;
 498 }
 499
 500 #define DECODE_SUBBAND_COEFFS(TABLE, COND)                              \
 501     while (1) {                                                         \
 502         int level, run, coeff;                                          \
 503         BITSTREAM_RL_VLC(level, run, &s->bc, s->TABLE, VLC_BITS, 3);    \
 504                                                                         \
 505         /* escape */                                                    \
 506         if (COND)                                                       \
 507             break;                                                      \
 508                                                                         \
 509         count += run;                                                   \
 510                                                                         \
 511         if (count > expected) {                                         \
 512             av_log(s->avctx, AV_LOG_ERROR, "Escape codeword not found, " \
 513                    "probably corrupt data\n");                          \
 514             return AVERROR_INVALIDDATA;                                 \
 515         }                                                               \
 516                                                                         \
 517         coeff = dequant_and_decompand(level, s->quantisation);          \
 518         for (i = 0; i < run; i++)                                       \
 519             *coeff_data++ = coeff;                                      \
 520     }                                                                   \
 521
 522 static int read_highpass_coeffs(CFHDContext *s, GetByteContext *gb,
 523                                 int16_t *coeff_data)
 524 {
 525     int i, ret;
 526     int highpass_height       = s->plane[s->channel_num].band[s->level][s->subband_num].height;
 527     int highpass_width        = s->plane[s->channel_num].band[s->level][s->subband_num].width;
 528     int highpass_a_width      = s->plane[s->channel_num].band[s->level][s->subband_num].a_width;
 529     int highpass_a_height     = s->plane[s->channel_num].band[s->level][s->subband_num].a_height;
 530     ptrdiff_t highpass_stride = s->plane[s->channel_num].band[s->level][s->subband_num].stride;
 531     int expected   = highpass_height   * highpass_stride;
 532     int a_expected = highpass_a_height * highpass_a_width;
 533     int count = 0;
 534     unsigned bytes;
 535
 536     if (highpass_height > highpass_a_height ||
 537         highpass_width  > highpass_a_width  ||
 538         a_expected      < expected) {
 539         av_log(s->avctx, AV_LOG_ERROR, "Too many highpass coefficients\n");
 540         return AVERROR_INVALIDDATA;
 541     }
 542
 543     av_log(s->avctx, AV_LOG_DEBUG,
 544            "Start subband coeffs plane %i level %i codebook %i expected %i\n",
 545            s->channel_num, s->level, s->codebook, expected);
 546
 547     if ((ret = bitstream_init8(&s->bc, gb->buffer,
 548                                bytestream2_get_bytes_left(gb))) < 0)
 549         return ret;
 550     if (!s->codebook) {
 551         DECODE_SUBBAND_COEFFS(table_9_rl_vlc, level == 64)
 552     } else {
 553         DECODE_SUBBAND_COEFFS(table_18_rl_vlc, level == 255 && run == 2)
 554     }
 555
 556     bytes = FFALIGN(AV_CEIL_RSHIFT(bitstream_tell(&s->bc), 3), 4);
 557     if (bytes > bytestream2_get_bytes_left(gb)) {
 558         av_log(s->avctx, AV_LOG_ERROR, "Bitstream overread error\n");
 559         return AVERROR_INVALIDDATA;
 560     } else
 561         bytestream2_seek(gb, bytes, SEEK_CUR);
 562
 563     av_log(s->avctx, AV_LOG_DEBUG, "End subband coeffs %i extra %i\n",
 564            count, count - expected);
 565     s->codebook = 0;
 566
 567     /* Copy last coefficient line if height is odd. */
 568     if (highpass_height & 1) {
 569         int16_t *last_line = &coeff_data[expected];
 570         memcpy(last_line, &last_line[-highpass_stride],
 571                highpass_stride * sizeof(*coeff_data));
 572     }
 573
 574     return 0;
 575 }
 576
 577 static int reconstruct_level(CFHDContext *s, AVFrame *pic, int plane, int level)
 578 {
 579     int i, j, idx = level - 1, idx2 = level > 1 ? 1 : 0;
 580     int16_t *low, *high, *output, *dst;
 581     int lowpass_height        = s->plane[plane].band[idx][idx2].height;
 582     int lowpass_width         = s->plane[plane].band[idx][idx2].width;
 583     ptrdiff_t highpass_stride = s->plane[plane].band[idx][1].stride;
 584
 585     if (lowpass_height                     > s->plane[plane].band[idx][idx2].a_height ||
 586         lowpass_width                      > s->plane[plane].band[idx][idx2].a_width  ||
 587         s->plane[plane].band[idx][1].width > s->plane[plane].band[idx][1].a_width     ||
 588         !highpass_stride) {
 589         av_log(s->avctx, AV_LOG_ERROR, "Invalid plane dimensions\n");
 590         return AVERROR_INVALIDDATA;
 591     }
 592
 593     av_log(s->avctx, AV_LOG_DEBUG, "Level %d plane %i %i %i %ti\n",
 594            level, plane, lowpass_height, lowpass_width, highpass_stride);
 595
 596     low    = s->plane[plane].subband[0];
 597     high   = s->plane[plane].subband[2 + 3 * idx];
 598     output = s->plane[plane].l_h[3 * idx];
 599     for (i = 0; i < lowpass_width; i++) {
 600         vert_filter(output, lowpass_width, low, lowpass_width, high,
 601                     highpass_stride, lowpass_height);
 602         low++;
 603         high++;
 604         output++;
 605     }
 606
 607     low    = s->plane[plane].subband[1 + 3 * idx];
 608     high   = s->plane[plane].subband[3 + 3 * idx];
 609     output = s->plane[plane].l_h[1 + 3 * idx];
 610     for (i = 0; i < lowpass_width; i++) {
 611         // note the stride of "low" is highpass_stride
 612         vert_filter(output, lowpass_width, low, highpass_stride, high,
 613                     highpass_stride, lowpass_height);
 614         low++;
 615         high++;
 616         output++;
 617     }
 618
 619     low  = s->plane[plane].l_h[0 + 3 * idx];
 620     high = s->plane[plane].l_h[1 + 3 * idx];
 621
 622     if (level != 3) {
 623         output = s->plane[plane].subband[0];
 624         for (i = 0; i < lowpass_height * 2; i++) {
 625             horiz_filter(output, low, high, lowpass_width);
 626             low    += lowpass_width;
 627             high   += lowpass_width;
 628             output += lowpass_width * 2;
 629         }
 630         if (s->bpc == 12 || level == 2) {
 631             output = s->plane[plane].subband[0];
 632             for (i = 0; i < lowpass_height * 2; i++) {
 633                 for (j = 0; j < lowpass_width * 2; j++)
 634                     output[j] <<= 2;
 635
 636                 output += lowpass_width * 2;
 637             }
 638         }
 639     } else {
 640         int act_plane = plane == 1 ? 2 : plane == 2 ? 1 : plane;
 641         dst = (int16_t *)pic->data[act_plane];
 642         for (i = 0; i < lowpass_height * 2; i++) {
 643             horiz_filter_clip(dst, low, high, lowpass_width, s->bpc);
 644             low  += lowpass_width;
 645             high += lowpass_width;
 646             dst  += pic->linesize[act_plane] / 2;
 647         }
 648     }
 649
 650     return 0;
 651 }
 652
 653 static int cfhd_decode(AVCodecContext *avctx, void *data, int *got_frame,
 654                        AVPacket *avpkt)
 655 {
 656     CFHDContext *s = avctx->priv_data;
 657     GetByteContext gb;
 658     ThreadFrame frame = { .f = data };
 659     int ret = 0, planes, plane;
 660     int16_t tag;
 661     uint16_t value;
 662
 663     init_frame_defaults(s);
 664     planes = av_pix_fmt_count_planes(s->coded_format);
 665
 666     bytestream2_init(&gb, avpkt->data, avpkt->size);
 667
 668     while (bytestream2_get_bytes_left(&gb) > 4) {
 669         if ((ret = parse_tag(s, &gb, &tag, &value, &planes)) < 0)
 670             return ret;
 671
 672         /* Some kind of end of header tag */
 673         if (tag == 4 && value == 0x1A4A)
 674             break;
 675     }
 676
 677     if (s->coded_width <= 0 || s->coded_height <= 0 || s->coded_format == AV_PIX_FMT_NONE) {
 678         av_log(avctx, AV_LOG_ERROR, "Video dimensions/format missing or invalid\n");
 679         return AVERROR_INVALIDDATA;
 680     }
 681
 682     ret = ff_set_dimensions(s->avctx, s->coded_width, s->coded_height);
 683     if (ret < 0)
 684         return ret;
 685     if (s->cropped_height)
 686         s->avctx->height = s->cropped_height;
 687
 688     s->avctx->pix_fmt = s->coded_format;
 689
 690     if (s->a_width != s->coded_width || s->a_height != s->coded_height ||
 691         s->a_format != s->coded_format) {
 692         free_buffers(s);
 693         if ((ret = alloc_buffers(s)) < 0) {
 694             free_buffers(s);
 695             return ret;
 696         }
 697     }
 698
 699     if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
 700         return ret;
 701
 702     s->coded_width  = 0;
 703     s->coded_height = 0;
 704     s->coded_format = AV_PIX_FMT_NONE;
 705
 706     while (bytestream2_get_bytes_left(&gb) > 4) {
 707         int16_t *coeff_data;
 708
 709         if ((ret = parse_tag(s, &gb, &tag, &value, &planes)) < 0)
 710             return ret;
 711
 712         coeff_data = s->plane[s->channel_num].subband[s->subband_num_actual];
 713         if (tag == 4 && value == 0x0F0F) {
 714             if ((ret = read_lowpass_coeffs(s, &gb, coeff_data)) < 0)
 715                 return ret;
 716         } else if (tag == 55 && s->subband_num_actual != 255) {
 717             if ((ret = read_highpass_coeffs(s, &gb, coeff_data)) < 0)
 718                 return ret;
 719         }
 720     }
 721
 722     if (s->coded_width || s->coded_height || s->coded_format != AV_PIX_FMT_NONE) {
 723         av_log(avctx, AV_LOG_ERROR, "Invalid dimensions\n");
 724         return AVERROR_INVALIDDATA;
 725     }
 726
 727     planes = av_pix_fmt_count_planes(avctx->pix_fmt);
 728     for (plane = 0; plane < planes; plane++) {
 729         /* level 1 */
 730         if ((ret = reconstruct_level(s, data, plane, 1)) < 0)
 731             return ret;
 732
 733         /* level 2 */
 734         if ((ret = reconstruct_level(s, data, plane, 2)) < 0)
 735             return ret;
 736
 737         /* level 3 */
 738         if ((ret = reconstruct_level(s, data, plane, 3)) < 0)
 739             return ret;
 740     }
 741
 742     *got_frame = 1;
 743     return avpkt->size;
 744 }
 745
 746 static av_cold int cfhd_close(AVCodecContext *avctx)
 747 {
 748     CFHDContext *s = avctx->priv_data;
 749
 750     free_buffers(s);
 751
 752     ff_free_vlc(&s->vlc_9);
 753     ff_free_vlc(&s->vlc_18);
 754
 755     return 0;
 756 }
 757
 758 AVCodec ff_cfhd_decoder = {
 759     .name             = "cfhd",
 760     .long_name        = NULL_IF_CONFIG_SMALL("Cineform HD"),
 761     .type             = AVMEDIA_TYPE_VIDEO,
 762     .id               = AV_CODEC_ID_CFHD,
 763     .priv_data_size   = sizeof(CFHDContext),
 764     .init             = cfhd_init,
 765     .init_thread_copy = ONLY_IF_THREADS_ENABLED(cfhd_init),
 766     .close            = cfhd_close,
 767     .decode           = cfhd_decode,
 768     .capabilities     = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
 769     .caps_internal    = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
 770 };