Statistics
| Branch: | Revision:

ffmpeg / libavcodec / dsicinav.c @ e4141433

History | View | Annotate | Download (11.8 KB)

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 dsicinav.c
24
 * Delphine Software International CIN audio/video decoders
25
 */
26

    
27
#include "avcodec.h"
28
#include "common.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 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
                                 uint8_t *buf, int buf_size)
199
{
200
    CinVideoContext *cin = avctx->priv_data;
201
    int i, y, palette_type, palette_colors_count, bitmap_frame_type, bitmap_frame_size;
202

    
203
    cin->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
204
    if (avctx->reget_buffer(avctx, &cin->frame)) {
205
        av_log(cin->avctx, AV_LOG_ERROR, "delphinecinvideo: reget_buffer() failed to allocate a frame\n");
206
        return -1;
207
    }
208

    
209
    palette_type = buf[0];
210
    palette_colors_count = buf[1] | (buf[2] << 8);
211
    bitmap_frame_type = buf[3];
212
    buf += 4;
213

    
214
    bitmap_frame_size = buf_size - 4;
215

    
216
    /* handle palette */
217
    if (palette_type == 0) {
218
        for (i = 0; i < palette_colors_count; ++i) {
219
            cin->palette[i] = (buf[2] << 16) | (buf[1] << 8) | buf[0];
220
            buf += 3;
221
            bitmap_frame_size -= 3;
222
        }
223
    } else {
224
        for (i = 0; i < palette_colors_count; ++i) {
225
            cin->palette[buf[0]] = (buf[3] << 16) | (buf[2] << 8) | buf[1];
226
            buf += 4;
227
            bitmap_frame_size -= 4;
228
        }
229
    }
230
    memcpy(cin->frame.data[1], cin->palette, sizeof(cin->palette));
231
    cin->frame.palette_has_changed = 1;
232

    
233
    /* note: the decoding routines below assumes that surface.width = surface.pitch */
234
    switch (bitmap_frame_type) {
235
    case 9:
236
        cin_decode_rle(buf, bitmap_frame_size,
237
          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
238
        break;
239
    case 34:
240
        cin_decode_rle(buf, bitmap_frame_size,
241
          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
242
        cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
243
          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
244
        break;
245
    case 35:
246
        cin_decode_huffman(buf, bitmap_frame_size,
247
          cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
248
        cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
249
          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
250
        break;
251
    case 36:
252
        bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
253
          cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
254
        cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
255
          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
256
        cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
257
          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
258
        break;
259
    case 37:
260
        cin_decode_huffman(buf, bitmap_frame_size,
261
          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
262
        break;
263
    case 38:
264
        cin_decode_lzss(buf, bitmap_frame_size,
265
          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
266
        break;
267
    case 39:
268
        cin_decode_lzss(buf, bitmap_frame_size,
269
          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
270
        cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
271
          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
272
        break;
273
    }
274

    
275
    for (y = 0; y < cin->avctx->height; ++y)
276
        memcpy(cin->frame.data[0] + (cin->avctx->height - 1 - y) * cin->frame.linesize[0],
277
          cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,
278
          cin->avctx->width);
279

    
280
    FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_table[CIN_PRE_BMP]);
281

    
282
    *data_size = sizeof(AVFrame);
283
    *(AVFrame *)data = cin->frame;
284

    
285
    return buf_size;
286
}
287

    
288
static int cinvideo_decode_end(AVCodecContext *avctx)
289
{
290
    CinVideoContext *cin = avctx->priv_data;
291
    int i;
292

    
293
    if (cin->frame.data[0])
294
        avctx->release_buffer(avctx, &cin->frame);
295

    
296
    for (i = 0; i < 3; ++i)
297
        av_free(cin->bitmap_table[i]);
298

    
299
    return 0;
300
}
301

    
302
static int cinaudio_decode_init(AVCodecContext *avctx)
303
{
304
    CinAudioContext *cin = avctx->priv_data;
305

    
306
    cin->avctx = avctx;
307
    cin->initial_decode_frame = 1;
308
    cin->delta = 0;
309

    
310
    return 0;
311
}
312

    
313
static int cinaudio_decode_frame(AVCodecContext *avctx,
314
                                 void *data, int *data_size,
315
                                 uint8_t *buf, int buf_size)
316
{
317
    CinAudioContext *cin = avctx->priv_data;
318
    uint8_t *src = buf;
319
    int16_t *samples = (int16_t *)data;
320

    
321
    if (cin->initial_decode_frame) {
322
        cin->initial_decode_frame = 0;
323
        cin->delta = (int16_t)AV_RL16(src); src += 2;
324
        *samples++ = cin->delta;
325
        buf_size -= 2;
326
    }
327
    while (buf_size > 0) {
328
        cin->delta += cinaudio_delta16_table[*src++];
329
        cin->delta = av_clip(cin->delta, -32768, 32767);
330
        *samples++ = cin->delta;
331
        --buf_size;
332
    }
333

    
334
    *data_size = (uint8_t *)samples - (uint8_t *)data;
335

    
336
    return src - buf;
337
}
338

    
339

    
340
AVCodec dsicinvideo_decoder = {
341
    "dsicinvideo",
342
    CODEC_TYPE_VIDEO,
343
    CODEC_ID_DSICINVIDEO,
344
    sizeof(CinVideoContext),
345
    cinvideo_decode_init,
346
    NULL,
347
    cinvideo_decode_end,
348
    cinvideo_decode_frame,
349
    CODEC_CAP_DR1,
350
};
351

    
352
AVCodec dsicinaudio_decoder = {
353
    "dsicinaudio",
354
    CODEC_TYPE_AUDIO,
355
    CODEC_ID_DSICINAUDIO,
356
    sizeof(CinAudioContext),
357
    cinaudio_decode_init,
358
    NULL,
359
    NULL,
360
    cinaudio_decode_frame,
361
};