Make some functions which aren't used outside their declaring source file
[libav.git] / libavcodec / dsicinav.c
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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
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 int cinvideo_decode_init(AVCodecContext *avctx)
90{
91 CinVideoContext *cin = (CinVideoContext *)avctx->priv_data;
92 unsigned int i;
93
94 cin->avctx = avctx;
95 avctx->pix_fmt = PIX_FMT_PAL8;
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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 {
fead30d4 161 cmd = AV_RL16(src); src += 2;
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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 uint8_t *buf, int buf_size)
199{
200 CinVideoContext *cin = (CinVideoContext *)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
1345f4ed 280 FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_table[CIN_PRE_BMP]);
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281
282 *data_size = sizeof(AVFrame);
283 *(AVFrame *)data = cin->frame;
284
285 return buf_size;
286}
287
288static int cinvideo_decode_end(AVCodecContext *avctx)
289{
290 CinVideoContext *cin = (CinVideoContext *)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
302static int cinaudio_decode_init(AVCodecContext *avctx)
303{
304 CinAudioContext *cin = (CinAudioContext *)avctx->priv_data;
305
306 cin->avctx = avctx;
307 cin->initial_decode_frame = 1;
308 cin->delta = 0;
309
310 return 0;
311}
312
313static int cinaudio_decode_frame(AVCodecContext *avctx,
314 void *data, int *data_size,
315 uint8_t *buf, int buf_size)
316{
317 CinAudioContext *cin = (CinAudioContext *)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;
fead30d4 323 cin->delta = (int16_t)AV_RL16(src); src += 2;
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324 *samples++ = cin->delta;
325 buf_size -= 2;
326 }
327 while (buf_size > 0) {
328 cin->delta += cinaudio_delta16_table[*src++];
f66e4f5f 329 cin->delta = av_clip(cin->delta, -32768, 32767);
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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
340AVCodec 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
352AVCodec 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};