libavcodec/cdxl.c

   1 /*
   2  * CDXL video decoder
   3  * Copyright (c) 2011-2012 Paul B Mahol
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/intreadwrite.h"
  23 #include "libavutil/imgutils.h"
  24 #include "avcodec.h"
  25 #include "get_bits.h"
  26 #include "internal.h"
  27
  28 #define BIT_PLANAR   0x00
  29 #define BYTE_PLANAR  0x20
  30 #define CHUNKY       0x40
  31 #define BIT_LINE     0x80
  32 #define BYTE_LINE    0xC0
  33
  34 typedef struct {
  35     AVCodecContext *avctx;
  36     AVFrame        frame;
  37     int            bpp;
  38     int            format;
  39     int            padded_bits;
  40     const uint8_t  *palette;
  41     int            palette_size;
  42     const uint8_t  *video;
  43     int            video_size;
  44     uint8_t        *new_video;
  45     int            new_video_size;
  46 } CDXLVideoContext;
  47
  48 static av_cold int cdxl_decode_init(AVCodecContext *avctx)
  49 {
  50     CDXLVideoContext *c = avctx->priv_data;
  51
  52     avcodec_get_frame_defaults(&c->frame);
  53     c->new_video_size = 0;
  54     c->avctx          = avctx;
  55
  56     return 0;
  57 }
  58
  59 static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
  60 {
  61     int i;
  62
  63     for (i = 0; i < c->palette_size / 2; i++) {
  64         unsigned rgb = AV_RB16(&c->palette[i * 2]);
  65         unsigned r   = ((rgb >> 8) & 0xF) * 0x11;
  66         unsigned g   = ((rgb >> 4) & 0xF) * 0x11;
  67         unsigned b   =  (rgb       & 0xF) * 0x11;
  68         AV_WN32(&new_palette[i], (r << 16) | (g << 8) | b);
  69     }
  70 }
  71
  72 static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
  73 {
  74     GetBitContext gb;
  75     int x, y, plane;
  76
  77     init_get_bits(&gb, c->video, c->video_size * 8);
  78     for (plane = 0; plane < c->bpp; plane++) {
  79         for (y = 0; y < c->avctx->height; y++) {
  80             for (x = 0; x < c->avctx->width; x++)
  81                 out[linesize * y + x] |= get_bits1(&gb) << plane;
  82             skip_bits(&gb, c->padded_bits);
  83         }
  84     }
  85 }
  86
  87 static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
  88 {
  89     GetBitContext  gb;
  90     int x, y, plane;
  91
  92     init_get_bits(&gb, c->video, c->video_size * 8);
  93     for (y = 0; y < c->avctx->height; y++) {
  94         for (plane = 0; plane < c->bpp; plane++) {
  95             for (x = 0; x < c->avctx->width; x++)
  96                 out[linesize * y + x] |= get_bits1(&gb) << plane;
  97             skip_bits(&gb, c->padded_bits);
  98         }
  99     }
 100 }
 101
 102 static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
 103 {
 104     memset(out, 0, linesize * c->avctx->height);
 105
 106     switch (c->format) {
 107     case BIT_PLANAR:
 108         bitplanar2chunky(c, linesize, out);
 109         break;
 110     case BIT_LINE:
 111         bitline2chunky(c, linesize, out);
 112         break;
 113     }
 114 }
 115
 116 static void cdxl_decode_rgb(CDXLVideoContext *c)
 117 {
 118     uint32_t *new_palette = (uint32_t *)c->frame.data[1];
 119
 120     import_palette(c, new_palette);
 121     import_format(c, c->frame.linesize[0], c->frame.data[0]);
 122 }
 123
 124 static void cdxl_decode_ham6(CDXLVideoContext *c)
 125 {
 126     AVCodecContext *avctx = c->avctx;
 127     uint32_t new_palette[16], r, g, b;
 128     uint8_t *ptr, *out, index, op;
 129     int x, y;
 130
 131     ptr = c->new_video;
 132     out = c->frame.data[0];
 133
 134     import_palette(c, new_palette);
 135     import_format(c, avctx->width, c->new_video);
 136
 137     for (y = 0; y < avctx->height; y++) {
 138         r = new_palette[0] & 0xFF0000;
 139         g = new_palette[0] & 0xFF00;
 140         b = new_palette[0] & 0xFF;
 141         for (x = 0; x < avctx->width; x++) {
 142             index  = *ptr++;
 143             op     = index >> 4;
 144             index &= 15;
 145             switch (op) {
 146             case 0:
 147                 r = new_palette[index] & 0xFF0000;
 148                 g = new_palette[index] & 0xFF00;
 149                 b = new_palette[index] & 0xFF;
 150                 break;
 151             case 1:
 152                 b = index * 0x11;
 153                 break;
 154             case 2:
 155                 r = index * 0x11 << 16;
 156                 break;
 157             case 3:
 158                 g = index * 0x11 << 8;
 159                 break;
 160             }
 161             AV_WL24(out + x * 3, r | g | b);
 162         }
 163         out += c->frame.linesize[0];
 164     }
 165 }
 166
 167 static void cdxl_decode_ham8(CDXLVideoContext *c)
 168 {
 169     AVCodecContext *avctx = c->avctx;
 170     uint32_t new_palette[64], r, g, b;
 171     uint8_t *ptr, *out, index, op;
 172     int x, y;
 173
 174     ptr = c->new_video;
 175     out = c->frame.data[0];
 176
 177     import_palette(c, new_palette);
 178     import_format(c, avctx->width, c->new_video);
 179
 180     for (y = 0; y < avctx->height; y++) {
 181         r = new_palette[0] & 0xFF0000;
 182         g = new_palette[0] & 0xFF00;
 183         b = new_palette[0] & 0xFF;
 184         for (x = 0; x < avctx->width; x++) {
 185             index  = *ptr++;
 186             op     = index >> 6;
 187             index &= 63;
 188             switch (op) {
 189             case 0:
 190                 r = new_palette[index] & 0xFF0000;
 191                 g = new_palette[index] & 0xFF00;
 192                 b = new_palette[index] & 0xFF;
 193                 break;
 194             case 1:
 195                 b = (index <<  2) | (b & 3);
 196                 break;
 197             case 2:
 198                 r = (index << 18) | (r & (3 << 16));
 199                 break;
 200             case 3:
 201                 g = (index << 10) | (g & (3 << 8));
 202                 break;
 203             }
 204             AV_WL24(out + x * 3, r | g | b);
 205         }
 206         out += c->frame.linesize[0];
 207     }
 208 }
 209
 210 static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
 211                              int *got_frame, AVPacket *pkt)
 212 {
 213     CDXLVideoContext *c = avctx->priv_data;
 214     AVFrame * const p = &c->frame;
 215     int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
 216     const uint8_t *buf = pkt->data;
 217
 218     if (buf_size < 32)
 219         return AVERROR_INVALIDDATA;
 220     encoding        = buf[1] & 7;
 221     c->format       = buf[1] & 0xE0;
 222     w               = AV_RB16(&buf[14]);
 223     h               = AV_RB16(&buf[16]);
 224     c->bpp          = buf[19];
 225     c->palette_size = AV_RB16(&buf[20]);
 226     c->palette      = buf + 32;
 227     c->video        = c->palette + c->palette_size;
 228     c->video_size   = buf_size - c->palette_size - 32;
 229
 230     if (c->palette_size > 512)
 231         return AVERROR_INVALIDDATA;
 232     if (buf_size < c->palette_size + 32)
 233         return AVERROR_INVALIDDATA;
 234     if (c->bpp < 1)
 235         return AVERROR_INVALIDDATA;
 236     if (c->format != BIT_PLANAR && c->format != BIT_LINE) {
 237         av_log_ask_for_sample(avctx, "unsupported pixel format: 0x%0x\n", c->format);
 238         return AVERROR_PATCHWELCOME;
 239     }
 240
 241     if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
 242         return ret;
 243     if (w != avctx->width || h != avctx->height)
 244         avcodec_set_dimensions(avctx, w, h);
 245
 246     aligned_width = FFALIGN(c->avctx->width, 16);
 247     c->padded_bits  = aligned_width - c->avctx->width;
 248     if (c->video_size < aligned_width * avctx->height * c->bpp / 8)
 249         return AVERROR_INVALIDDATA;
 250     if (!encoding && c->palette_size && c->bpp <= 8) {
 251         avctx->pix_fmt = AV_PIX_FMT_PAL8;
 252     } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) {
 253         if (c->palette_size != (1 << (c->bpp - 1)))
 254             return AVERROR_INVALIDDATA;
 255         avctx->pix_fmt = AV_PIX_FMT_BGR24;
 256     } else {
 257         av_log_ask_for_sample(avctx, "unsupported encoding %d and bpp %d\n",
 258                               encoding, c->bpp);
 259         return AVERROR_PATCHWELCOME;
 260     }
 261
 262     if (p->data[0])
 263         avctx->release_buffer(avctx, p);
 264
 265     p->reference = 0;
 266     if ((ret = ff_get_buffer(avctx, p)) < 0) {
 267         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 268         return ret;
 269     }
 270     p->pict_type = AV_PICTURE_TYPE_I;
 271
 272     if (encoding) {
 273         av_fast_padded_malloc(&c->new_video, &c->new_video_size,
 274                               h * w + FF_INPUT_BUFFER_PADDING_SIZE);
 275         if (!c->new_video)
 276             return AVERROR(ENOMEM);
 277         if (c->bpp == 8)
 278             cdxl_decode_ham8(c);
 279         else
 280             cdxl_decode_ham6(c);
 281     } else {
 282         cdxl_decode_rgb(c);
 283     }
 284     *got_frame = 1;
 285     *(AVFrame*)data = c->frame;
 286
 287     return buf_size;
 288 }
 289
 290 static av_cold int cdxl_decode_end(AVCodecContext *avctx)
 291 {
 292     CDXLVideoContext *c = avctx->priv_data;
 293
 294     av_free(c->new_video);
 295     if (c->frame.data[0])
 296         avctx->release_buffer(avctx, &c->frame);
 297
 298     return 0;
 299 }
 300
 301 AVCodec ff_cdxl_decoder = {
 302     .name           = "cdxl",
 303     .type           = AVMEDIA_TYPE_VIDEO,
 304     .id             = AV_CODEC_ID_CDXL,
 305     .priv_data_size = sizeof(CDXLVideoContext),
 306     .init           = cdxl_decode_init,
 307     .close          = cdxl_decode_end,
 308     .decode         = cdxl_decode_frame,
 309     .capabilities   = CODEC_CAP_DR1,
 310     .long_name      = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
 311 };