libavcodec/dsicinav.c

   1 /*
   2  * Delphine Software International CIN Audio/Video Decoders
   3  * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file libavcodec/dsicinav.c
  24  * Delphine Software International CIN audio/video decoders
  25  */
  26
  27 #include "avcodec.h"
  28 #include "bytestream.h"
  29
  30
  31 typedef enum CinVideoBitmapIndex {
  32     CIN_CUR_BMP = 0, /* current */
  33     CIN_PRE_BMP = 1, /* previous */
  34     CIN_INT_BMP = 2  /* intermediate */
  35 } CinVideoBitmapIndex;
  36
  37 typedef struct CinVideoContext {
  38     AVCodecContext *avctx;
  39     AVFrame frame;
  40     unsigned int bitmap_size;
  41     uint32_t palette[256];
  42     uint8_t *bitmap_table[3];
  43 } CinVideoContext;
  44
  45 typedef struct CinAudioContext {
  46     AVCodecContext *avctx;
  47     int initial_decode_frame;
  48     int delta;
  49 } CinAudioContext;
  50
  51
  52 /* table defining a geometric sequence with multiplier = 32767 ^ (1 / 128) */
  53 static const int16_t cinaudio_delta16_table[256] = {
  54          0,      0,      0,      0,      0,      0,      0,      0,
  55          0,      0,      0,      0,      0,      0,      0,      0,
  56          0,      0,      0, -30210, -27853, -25680, -23677, -21829,
  57     -20126, -18556, -17108, -15774, -14543, -13408, -12362, -11398,
  58     -10508,  -9689,  -8933,  -8236,  -7593,  -7001,  -6455,  -5951,
  59      -5487,  -5059,  -4664,  -4300,  -3964,  -3655,  -3370,  -3107,
  60      -2865,  -2641,  -2435,  -2245,  -2070,  -1908,  -1759,  -1622,
  61      -1495,  -1379,  -1271,  -1172,  -1080,   -996,   -918,   -847,
  62       -781,   -720,   -663,   -612,   -564,   -520,   -479,   -442,
  63       -407,   -376,   -346,   -319,   -294,   -271,   -250,   -230,
  64       -212,   -196,   -181,   -166,   -153,   -141,   -130,   -120,
  65       -111,   -102,    -94,    -87,    -80,    -74,    -68,    -62,
  66        -58,    -53,    -49,    -45,    -41,    -38,    -35,    -32,
  67        -30,    -27,    -25,    -23,    -21,    -20,    -18,    -17,
  68        -15,    -14,    -13,    -12,    -11,    -10,     -9,     -8,
  69         -7,     -6,     -5,     -4,     -3,     -2,     -1,      0,
  70          0,      1,      2,      3,      4,      5,      6,      7,
  71          8,      9,     10,     11,     12,     13,     14,     15,
  72         17,     18,     20,     21,     23,     25,     27,     30,
  73         32,     35,     38,     41,     45,     49,     53,     58,
  74         62,     68,     74,     80,     87,     94,    102,    111,
  75        120,    130,    141,    153,    166,    181,    196,    212,
  76        230,    250,    271,    294,    319,    346,    376,    407,
  77        442,    479,    520,    564,    612,    663,    720,    781,
  78        847,    918,    996,   1080,   1172,   1271,   1379,   1495,
  79       1622,   1759,   1908,   2070,   2245,   2435,   2641,   2865,
  80       3107,   3370,   3655,   3964,   4300,   4664,   5059,   5487,
  81       5951,   6455,   7001,   7593,   8236,   8933,   9689,  10508,
  82      11398,  12362,  13408,  14543,  15774,  17108,  18556,  20126,
  83      21829,  23677,  25680,  27853,  30210,      0,      0,      0,
  84          0,      0,      0,      0,      0,      0,      0,      0,
  85          0,      0,      0,      0,      0,      0,      0,      0
  86 };
  87
  88
  89 static av_cold int cinvideo_decode_init(AVCodecContext *avctx)
  90 {
  91     CinVideoContext *cin = avctx->priv_data;
  92     unsigned int i;
  93
  94     cin->avctx = avctx;
  95     avctx->pix_fmt = PIX_FMT_PAL8;
  96
  97     cin->frame.data[0] = NULL;
  98
  99     cin->bitmap_size = avctx->width * avctx->height;
 100     for (i = 0; i < 3; ++i) {
 101         cin->bitmap_table[i] = av_mallocz(cin->bitmap_size);
 102         if (!cin->bitmap_table[i])
 103             av_log(avctx, AV_LOG_ERROR, "Can't allocate bitmap buffers.\n");
 104     }
 105
 106     return 0;
 107 }
 108
 109 static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst, int size)
 110 {
 111     while (size--)
 112         *dst++ += *src++;
 113 }
 114
 115 static int cin_decode_huffman(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
 116 {
 117     int b, huff_code = 0;
 118     unsigned char huff_code_table[15];
 119     unsigned char *dst_cur = dst;
 120     unsigned char *dst_end = dst + dst_size;
 121     const unsigned char *src_end = src + src_size;
 122
 123     memcpy(huff_code_table, src, 15); src += 15; src_size -= 15;
 124
 125     while (src < src_end) {
 126         huff_code = *src++;
 127         if ((huff_code >> 4) == 15) {
 128             b = huff_code << 4;
 129             huff_code = *src++;
 130             *dst_cur++ = b | (huff_code >> 4);
 131         } else
 132             *dst_cur++ = huff_code_table[huff_code >> 4];
 133         if (dst_cur >= dst_end)
 134             break;
 135
 136         huff_code &= 15;
 137         if (huff_code == 15) {
 138             *dst_cur++ = *src++;
 139         } else
 140             *dst_cur++ = huff_code_table[huff_code];
 141         if (dst_cur >= dst_end)
 142             break;
 143     }
 144
 145     return dst_cur - dst;
 146 }
 147
 148 static void cin_decode_lzss(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
 149 {
 150     uint16_t cmd;
 151     int i, sz, offset, code;
 152     unsigned char *dst_end = dst + dst_size;
 153     const unsigned char *src_end = src + src_size;
 154
 155     while (src < src_end && dst < dst_end) {
 156         code = *src++;
 157         for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) {
 158             if (code & (1 << i)) {
 159                 *dst++ = *src++;
 160             } else {
 161                 cmd = AV_RL16(src); src += 2;
 162                 offset = cmd >> 4;
 163                 sz = (cmd & 0xF) + 2;
 164                 /* don't use memcpy/memmove here as the decoding routine (ab)uses */
 165                 /* buffer overlappings to repeat bytes in the destination */
 166                 sz = FFMIN(sz, dst_end - dst);
 167                 while (sz--) {
 168                     *dst = *(dst - offset - 1);
 169                     ++dst;
 170                 }
 171             }
 172         }
 173     }
 174 }
 175
 176 static void cin_decode_rle(const unsigned char *src, int src_size, unsigned char *dst, int dst_size)
 177 {
 178     int len, code;
 179     unsigned char *dst_end = dst + dst_size;
 180     const unsigned char *src_end = src + src_size;
 181
 182     while (src < src_end && dst < dst_end) {
 183         code = *src++;
 184         if (code & 0x80) {
 185             len = code - 0x7F;
 186             memset(dst, *src++, FFMIN(len, dst_end - dst));
 187         } else {
 188             len = code + 1;
 189             memcpy(dst, src, FFMIN(len, dst_end - dst));
 190             src += len;
 191         }
 192         dst += len;
 193     }
 194 }
 195
 196 static int cinvideo_decode_frame(AVCodecContext *avctx,
 197                                  void *data, int *data_size,
 198                                  AVPacket *avpkt)
 199 {
 200     const uint8_t *buf = avpkt->data;
 201     int buf_size = avpkt->size;
 202     CinVideoContext *cin = avctx->priv_data;
 203     int i, y, palette_type, palette_colors_count, bitmap_frame_type, bitmap_frame_size;
 204
 205     cin->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 206     if (avctx->reget_buffer(avctx, &cin->frame)) {
 207         av_log(cin->avctx, AV_LOG_ERROR, "delphinecinvideo: reget_buffer() failed to allocate a frame\n");
 208         return -1;
 209     }
 210
 211     palette_type = buf[0];
 212     palette_colors_count = AV_RL16(buf+1);
 213     bitmap_frame_type = buf[3];
 214     buf += 4;
 215
 216     bitmap_frame_size = buf_size - 4;
 217
 218     /* handle palette */
 219     if (palette_type == 0) {
 220         for (i = 0; i < palette_colors_count; ++i) {
 221             cin->palette[i] = bytestream_get_le24(&buf);
 222             bitmap_frame_size -= 3;
 223         }
 224     } else {
 225         for (i = 0; i < palette_colors_count; ++i) {
 226             cin->palette[buf[0]] = AV_RL24(buf+1);
 227             buf += 4;
 228             bitmap_frame_size -= 4;
 229         }
 230     }
 231     memcpy(cin->frame.data[1], cin->palette, sizeof(cin->palette));
 232     cin->frame.palette_has_changed = 1;
 233
 234     /* note: the decoding routines below assumes that surface.width = surface.pitch */
 235     switch (bitmap_frame_type) {
 236     case 9:
 237         cin_decode_rle(buf, bitmap_frame_size,
 238           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
 239         break;
 240     case 34:
 241         cin_decode_rle(buf, bitmap_frame_size,
 242           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
 243         cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
 244           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
 245         break;
 246     case 35:
 247         cin_decode_huffman(buf, bitmap_frame_size,
 248           cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
 249         cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
 250           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
 251         break;
 252     case 36:
 253         bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
 254           cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
 255         cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
 256           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
 257         cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
 258           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
 259         break;
 260     case 37:
 261         cin_decode_huffman(buf, bitmap_frame_size,
 262           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
 263         break;
 264     case 38:
 265         cin_decode_lzss(buf, bitmap_frame_size,
 266           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
 267         break;
 268     case 39:
 269         cin_decode_lzss(buf, bitmap_frame_size,
 270           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
 271         cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
 272           cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
 273         break;
 274     }
 275
 276     for (y = 0; y < cin->avctx->height; ++y)
 277         memcpy(cin->frame.data[0] + (cin->avctx->height - 1 - y) * cin->frame.linesize[0],
 278           cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,
 279           cin->avctx->width);
 280
 281     FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_table[CIN_PRE_BMP]);
 282
 283     *data_size = sizeof(AVFrame);
 284     *(AVFrame *)data = cin->frame;
 285
 286     return buf_size;
 287 }
 288
 289 static av_cold int cinvideo_decode_end(AVCodecContext *avctx)
 290 {
 291     CinVideoContext *cin = avctx->priv_data;
 292     int i;
 293
 294     if (cin->frame.data[0])
 295         avctx->release_buffer(avctx, &cin->frame);
 296
 297     for (i = 0; i < 3; ++i)
 298         av_free(cin->bitmap_table[i]);
 299
 300     return 0;
 301 }
 302
 303 static av_cold int cinaudio_decode_init(AVCodecContext *avctx)
 304 {
 305     CinAudioContext *cin = avctx->priv_data;
 306
 307     cin->avctx = avctx;
 308     cin->initial_decode_frame = 1;
 309     cin->delta = 0;
 310     avctx->sample_fmt = SAMPLE_FMT_S16;
 311
 312     return 0;
 313 }
 314
 315 static int cinaudio_decode_frame(AVCodecContext *avctx,
 316                                  void *data, int *data_size,
 317                                  AVPacket *avpkt)
 318 {
 319     const uint8_t *buf = avpkt->data;
 320     int buf_size = avpkt->size;
 321     CinAudioContext *cin = avctx->priv_data;
 322     const uint8_t *src = buf;
 323     int16_t *samples = (int16_t *)data;
 324
 325     buf_size = FFMIN(buf_size, *data_size/2);
 326
 327     if (cin->initial_decode_frame) {
 328         cin->initial_decode_frame = 0;
 329         cin->delta = (int16_t)AV_RL16(src); src += 2;
 330         *samples++ = cin->delta;
 331         buf_size -= 2;
 332     }
 333     while (buf_size > 0) {
 334         cin->delta += cinaudio_delta16_table[*src++];
 335         cin->delta = av_clip_int16(cin->delta);
 336         *samples++ = cin->delta;
 337         --buf_size;
 338     }
 339
 340     *data_size = (uint8_t *)samples - (uint8_t *)data;
 341
 342     return src - buf;
 343 }
 344
 345
 346 AVCodec dsicinvideo_decoder = {
 347     "dsicinvideo",
 348     CODEC_TYPE_VIDEO,
 349     CODEC_ID_DSICINVIDEO,
 350     sizeof(CinVideoContext),
 351     cinvideo_decode_init,
 352     NULL,
 353     cinvideo_decode_end,
 354     cinvideo_decode_frame,
 355     CODEC_CAP_DR1,
 356     .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"),
 357 };
 358
 359 AVCodec dsicinaudio_decoder = {
 360     "dsicinaudio",
 361     CODEC_TYPE_AUDIO,
 362     CODEC_ID_DSICINAUDIO,
 363     sizeof(CinAudioContext),
 364     cinaudio_decode_init,
 365     NULL,
 366     NULL,
 367     cinaudio_decode_frame,
 368     .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN audio"),
 369 };