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
31typedef enum CinVideoBitmapIndex {
32    CIN_CUR_BMP = 0, /* current */
33    CIN_PRE_BMP = 1, /* previous */
34    CIN_INT_BMP = 2  /* intermediate */
35} CinVideoBitmapIndex;
36
37typedef 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
45typedef 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) */
53static 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
89static 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
109static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst, int size)
110{
111    while (size--)
112        *dst++ += *src++;
113}
114
115static 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
148static 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
176static 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
196static int cinvideo_decode_frame(AVCodecContext *avctx,
197                                 void *data, int *data_size,
198                                 const 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 = AV_RL16(buf+1);
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] = bytestream_get_le24(&buf);
220            bitmap_frame_size -= 3;
221        }
222    } else {
223        for (i = 0; i < palette_colors_count; ++i) {
224            cin->palette[buf[0]] = AV_RL24(buf+1);
225            buf += 4;
226            bitmap_frame_size -= 4;
227        }
228    }
229    memcpy(cin->frame.data[1], cin->palette, sizeof(cin->palette));
230    cin->frame.palette_has_changed = 1;
231
232    /* note: the decoding routines below assumes that surface.width = surface.pitch */
233    switch (bitmap_frame_type) {
234    case 9:
235        cin_decode_rle(buf, bitmap_frame_size,
236          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
237        break;
238    case 34:
239        cin_decode_rle(buf, bitmap_frame_size,
240          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
241        cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
242          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
243        break;
244    case 35:
245        cin_decode_huffman(buf, bitmap_frame_size,
246          cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
247        cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
248          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
249        break;
250    case 36:
251        bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
252          cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
253        cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
254          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
255        cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
256          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
257        break;
258    case 37:
259        cin_decode_huffman(buf, bitmap_frame_size,
260          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
261        break;
262    case 38:
263        cin_decode_lzss(buf, bitmap_frame_size,
264          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
265        break;
266    case 39:
267        cin_decode_lzss(buf, bitmap_frame_size,
268          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
269        cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
270          cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
271        break;
272    }
273
274    for (y = 0; y < cin->avctx->height; ++y)
275        memcpy(cin->frame.data[0] + (cin->avctx->height - 1 - y) * cin->frame.linesize[0],
276          cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,
277          cin->avctx->width);
278
279    FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_table[CIN_PRE_BMP]);
280
281    *data_size = sizeof(AVFrame);
282    *(AVFrame *)data = cin->frame;
283
284    return buf_size;
285}
286
287static av_cold int cinvideo_decode_end(AVCodecContext *avctx)
288{
289    CinVideoContext *cin = avctx->priv_data;
290    int i;
291
292    if (cin->frame.data[0])
293        avctx->release_buffer(avctx, &cin->frame);
294
295    for (i = 0; i < 3; ++i)
296        av_free(cin->bitmap_table[i]);
297
298    return 0;
299}
300
301static av_cold int cinaudio_decode_init(AVCodecContext *avctx)
302{
303    CinAudioContext *cin = avctx->priv_data;
304
305    cin->avctx = avctx;
306    cin->initial_decode_frame = 1;
307    cin->delta = 0;
308    avctx->sample_fmt = SAMPLE_FMT_S16;
309
310    return 0;
311}
312
313static int cinaudio_decode_frame(AVCodecContext *avctx,
314                                 void *data, int *data_size,
315                                 const uint8_t *buf, int buf_size)
316{
317    CinAudioContext *cin = avctx->priv_data;
318    const uint8_t *src = buf;
319    int16_t *samples = (int16_t *)data;
320
321    buf_size = FFMIN(buf_size, *data_size/2);
322
323    if (cin->initial_decode_frame) {
324        cin->initial_decode_frame = 0;
325        cin->delta = (int16_t)AV_RL16(src); src += 2;
326        *samples++ = cin->delta;
327        buf_size -= 2;
328    }
329    while (buf_size > 0) {
330        cin->delta += cinaudio_delta16_table[*src++];
331        cin->delta = av_clip_int16(cin->delta);
332        *samples++ = cin->delta;
333        --buf_size;
334    }
335
336    *data_size = (uint8_t *)samples - (uint8_t *)data;
337
338    return src - buf;
339}
340
341
342AVCodec dsicinvideo_decoder = {
343    "dsicinvideo",
344    CODEC_TYPE_VIDEO,
345    CODEC_ID_DSICINVIDEO,
346    sizeof(CinVideoContext),
347    cinvideo_decode_init,
348    NULL,
349    cinvideo_decode_end,
350    cinvideo_decode_frame,
351    CODEC_CAP_DR1,
352    .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"),
353};
354
355AVCodec dsicinaudio_decoder = {
356    "dsicinaudio",
357    CODEC_TYPE_AUDIO,
358    CODEC_ID_DSICINAUDIO,
359    sizeof(CinAudioContext),
360    cinaudio_decode_init,
361    NULL,
362    NULL,
363    cinaudio_decode_frame,
364    .long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN audio"),
365};
366