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1 | /* |
2 | * Microsoft Video-1 Decoder | |
3 | * Copyright (c) 2003 The FFmpeg Project | |
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 | |
24 | * Microsoft Video-1 Decoder by Mike Melanson (melanson@pcisys.net) | |
25 | * For more information about the MS Video-1 format, visit: | |
26 | * http://www.pcisys.net/~melanson/codecs/ | |
27 | * | |
28 | */ | |
29 | ||
30 | #include <stdio.h> | |
31 | #include <stdlib.h> | |
32 | #include <string.h> | |
33 | ||
34 | #include "libavutil/internal.h" | |
35 | #include "libavutil/intreadwrite.h" | |
36 | #include "avcodec.h" | |
37 | #include "internal.h" | |
38 | ||
39 | #define PALETTE_COUNT 256 | |
40 | #define CHECK_STREAM_PTR(n) \ | |
41 | if ((stream_ptr + n) > s->size ) { \ | |
42 | av_log(s->avctx, AV_LOG_ERROR, " MS Video-1 warning: stream_ptr out of bounds (%d >= %d)\n", \ | |
43 | stream_ptr + n, s->size); \ | |
44 | return; \ | |
45 | } | |
46 | ||
47 | typedef struct Msvideo1Context { | |
48 | ||
49 | AVCodecContext *avctx; | |
50 | AVFrame *frame; | |
51 | ||
52 | const unsigned char *buf; | |
53 | int size; | |
54 | ||
55 | int mode_8bit; /* if it's not 8-bit, it's 16-bit */ | |
56 | ||
57 | uint32_t pal[256]; | |
58 | } Msvideo1Context; | |
59 | ||
60 | static av_cold int msvideo1_decode_init(AVCodecContext *avctx) | |
61 | { | |
62 | Msvideo1Context *s = avctx->priv_data; | |
63 | ||
64 | s->avctx = avctx; | |
65 | ||
66 | /* figure out the colorspace based on the presence of a palette */ | |
67 | if (s->avctx->bits_per_coded_sample == 8) { | |
68 | s->mode_8bit = 1; | |
69 | avctx->pix_fmt = AV_PIX_FMT_PAL8; | |
70 | if (avctx->extradata_size >= AVPALETTE_SIZE) | |
71 | memcpy(s->pal, avctx->extradata, AVPALETTE_SIZE); | |
72 | } else { | |
73 | s->mode_8bit = 0; | |
74 | avctx->pix_fmt = AV_PIX_FMT_RGB555; | |
75 | } | |
76 | ||
77 | s->frame = av_frame_alloc(); | |
78 | if (!s->frame) | |
79 | return AVERROR(ENOMEM); | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
84 | static void msvideo1_decode_8bit(Msvideo1Context *s) | |
85 | { | |
86 | int block_ptr, pixel_ptr; | |
87 | int total_blocks; | |
88 | int pixel_x, pixel_y; /* pixel width and height iterators */ | |
89 | int block_x, block_y; /* block width and height iterators */ | |
90 | int blocks_wide, blocks_high; /* width and height in 4x4 blocks */ | |
91 | int block_inc; | |
92 | int row_dec; | |
93 | ||
94 | /* decoding parameters */ | |
95 | int stream_ptr; | |
96 | unsigned char byte_a, byte_b; | |
97 | unsigned short flags; | |
98 | int skip_blocks; | |
99 | unsigned char colors[8]; | |
100 | unsigned char *pixels = s->frame->data[0]; | |
101 | int stride = s->frame->linesize[0]; | |
102 | ||
103 | stream_ptr = 0; | |
104 | skip_blocks = 0; | |
105 | blocks_wide = s->avctx->width / 4; | |
106 | blocks_high = s->avctx->height / 4; | |
107 | total_blocks = blocks_wide * blocks_high; | |
108 | block_inc = 4; | |
109 | row_dec = stride + 4; | |
110 | ||
111 | for (block_y = blocks_high; block_y > 0; block_y--) { | |
112 | block_ptr = ((block_y * 4) - 1) * stride; | |
113 | for (block_x = blocks_wide; block_x > 0; block_x--) { | |
114 | /* check if this block should be skipped */ | |
115 | if (skip_blocks) { | |
116 | block_ptr += block_inc; | |
117 | skip_blocks--; | |
118 | total_blocks--; | |
119 | continue; | |
120 | } | |
121 | ||
122 | pixel_ptr = block_ptr; | |
123 | ||
124 | /* get the next two bytes in the encoded data stream */ | |
125 | CHECK_STREAM_PTR(2); | |
126 | byte_a = s->buf[stream_ptr++]; | |
127 | byte_b = s->buf[stream_ptr++]; | |
128 | ||
129 | /* check if the decode is finished */ | |
130 | if ((byte_a == 0) && (byte_b == 0) && (total_blocks == 0)) | |
131 | return; | |
132 | else if ((byte_b & 0xFC) == 0x84) { | |
133 | /* skip code, but don't count the current block */ | |
134 | skip_blocks = ((byte_b - 0x84) << 8) + byte_a - 1; | |
135 | } else if (byte_b < 0x80) { | |
136 | /* 2-color encoding */ | |
137 | flags = (byte_b << 8) | byte_a; | |
138 | ||
139 | CHECK_STREAM_PTR(2); | |
140 | colors[0] = s->buf[stream_ptr++]; | |
141 | colors[1] = s->buf[stream_ptr++]; | |
142 | ||
143 | for (pixel_y = 0; pixel_y < 4; pixel_y++) { | |
144 | for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1) | |
145 | pixels[pixel_ptr++] = colors[(flags & 0x1) ^ 1]; | |
146 | pixel_ptr -= row_dec; | |
147 | } | |
148 | } else if (byte_b >= 0x90) { | |
149 | /* 8-color encoding */ | |
150 | flags = (byte_b << 8) | byte_a; | |
151 | ||
152 | CHECK_STREAM_PTR(8); | |
153 | memcpy(colors, &s->buf[stream_ptr], 8); | |
154 | stream_ptr += 8; | |
155 | ||
156 | for (pixel_y = 0; pixel_y < 4; pixel_y++) { | |
157 | for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1) | |
158 | pixels[pixel_ptr++] = | |
159 | colors[((pixel_y & 0x2) << 1) + | |
160 | (pixel_x & 0x2) + ((flags & 0x1) ^ 1)]; | |
161 | pixel_ptr -= row_dec; | |
162 | } | |
163 | } else { | |
164 | /* 1-color encoding */ | |
165 | colors[0] = byte_a; | |
166 | ||
167 | for (pixel_y = 0; pixel_y < 4; pixel_y++) { | |
168 | for (pixel_x = 0; pixel_x < 4; pixel_x++) | |
169 | pixels[pixel_ptr++] = colors[0]; | |
170 | pixel_ptr -= row_dec; | |
171 | } | |
172 | } | |
173 | ||
174 | block_ptr += block_inc; | |
175 | total_blocks--; | |
176 | } | |
177 | } | |
178 | ||
179 | /* make the palette available on the way out */ | |
180 | if (s->avctx->pix_fmt == AV_PIX_FMT_PAL8) | |
181 | memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE); | |
182 | } | |
183 | ||
184 | static void msvideo1_decode_16bit(Msvideo1Context *s) | |
185 | { | |
186 | int block_ptr, pixel_ptr; | |
187 | int total_blocks; | |
188 | int pixel_x, pixel_y; /* pixel width and height iterators */ | |
189 | int block_x, block_y; /* block width and height iterators */ | |
190 | int blocks_wide, blocks_high; /* width and height in 4x4 blocks */ | |
191 | int block_inc; | |
192 | int row_dec; | |
193 | ||
194 | /* decoding parameters */ | |
195 | int stream_ptr; | |
196 | unsigned char byte_a, byte_b; | |
197 | unsigned short flags; | |
198 | int skip_blocks; | |
199 | unsigned short colors[8]; | |
200 | unsigned short *pixels = (unsigned short *)s->frame->data[0]; | |
201 | int stride = s->frame->linesize[0] / 2; | |
202 | ||
203 | stream_ptr = 0; | |
204 | skip_blocks = 0; | |
205 | blocks_wide = s->avctx->width / 4; | |
206 | blocks_high = s->avctx->height / 4; | |
207 | total_blocks = blocks_wide * blocks_high; | |
208 | block_inc = 4; | |
209 | row_dec = stride + 4; | |
210 | ||
211 | for (block_y = blocks_high; block_y > 0; block_y--) { | |
212 | block_ptr = ((block_y * 4) - 1) * stride; | |
213 | for (block_x = blocks_wide; block_x > 0; block_x--) { | |
214 | /* check if this block should be skipped */ | |
215 | if (skip_blocks) { | |
216 | block_ptr += block_inc; | |
217 | skip_blocks--; | |
218 | total_blocks--; | |
219 | continue; | |
220 | } | |
221 | ||
222 | pixel_ptr = block_ptr; | |
223 | ||
224 | /* get the next two bytes in the encoded data stream */ | |
225 | CHECK_STREAM_PTR(2); | |
226 | byte_a = s->buf[stream_ptr++]; | |
227 | byte_b = s->buf[stream_ptr++]; | |
228 | ||
229 | /* check if the decode is finished */ | |
230 | if ((byte_a == 0) && (byte_b == 0) && (total_blocks == 0)) { | |
231 | return; | |
232 | } else if ((byte_b & 0xFC) == 0x84) { | |
233 | /* skip code, but don't count the current block */ | |
234 | skip_blocks = ((byte_b - 0x84) << 8) + byte_a - 1; | |
235 | } else if (byte_b < 0x80) { | |
236 | /* 2- or 8-color encoding modes */ | |
237 | flags = (byte_b << 8) | byte_a; | |
238 | ||
239 | CHECK_STREAM_PTR(4); | |
240 | colors[0] = AV_RL16(&s->buf[stream_ptr]); | |
241 | stream_ptr += 2; | |
242 | colors[1] = AV_RL16(&s->buf[stream_ptr]); | |
243 | stream_ptr += 2; | |
244 | ||
245 | if (colors[0] & 0x8000) { | |
246 | /* 8-color encoding */ | |
247 | CHECK_STREAM_PTR(12); | |
248 | colors[2] = AV_RL16(&s->buf[stream_ptr]); | |
249 | stream_ptr += 2; | |
250 | colors[3] = AV_RL16(&s->buf[stream_ptr]); | |
251 | stream_ptr += 2; | |
252 | colors[4] = AV_RL16(&s->buf[stream_ptr]); | |
253 | stream_ptr += 2; | |
254 | colors[5] = AV_RL16(&s->buf[stream_ptr]); | |
255 | stream_ptr += 2; | |
256 | colors[6] = AV_RL16(&s->buf[stream_ptr]); | |
257 | stream_ptr += 2; | |
258 | colors[7] = AV_RL16(&s->buf[stream_ptr]); | |
259 | stream_ptr += 2; | |
260 | ||
261 | for (pixel_y = 0; pixel_y < 4; pixel_y++) { | |
262 | for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1) | |
263 | pixels[pixel_ptr++] = | |
264 | colors[((pixel_y & 0x2) << 1) + | |
265 | (pixel_x & 0x2) + ((flags & 0x1) ^ 1)]; | |
266 | pixel_ptr -= row_dec; | |
267 | } | |
268 | } else { | |
269 | /* 2-color encoding */ | |
270 | for (pixel_y = 0; pixel_y < 4; pixel_y++) { | |
271 | for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1) | |
272 | pixels[pixel_ptr++] = colors[(flags & 0x1) ^ 1]; | |
273 | pixel_ptr -= row_dec; | |
274 | } | |
275 | } | |
276 | } else { | |
277 | /* otherwise, it's a 1-color block */ | |
278 | colors[0] = (byte_b << 8) | byte_a; | |
279 | ||
280 | for (pixel_y = 0; pixel_y < 4; pixel_y++) { | |
281 | for (pixel_x = 0; pixel_x < 4; pixel_x++) | |
282 | pixels[pixel_ptr++] = colors[0]; | |
283 | pixel_ptr -= row_dec; | |
284 | } | |
285 | } | |
286 | ||
287 | block_ptr += block_inc; | |
288 | total_blocks--; | |
289 | } | |
290 | } | |
291 | } | |
292 | ||
293 | static int msvideo1_decode_frame(AVCodecContext *avctx, | |
294 | void *data, int *got_frame, | |
295 | AVPacket *avpkt) | |
296 | { | |
297 | const uint8_t *buf = avpkt->data; | |
298 | int buf_size = avpkt->size; | |
299 | Msvideo1Context *s = avctx->priv_data; | |
300 | int ret; | |
301 | ||
302 | s->buf = buf; | |
303 | s->size = buf_size; | |
304 | ||
305 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) | |
306 | return ret; | |
307 | ||
308 | if (s->mode_8bit) { | |
309 | const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL); | |
310 | ||
311 | if (pal) { | |
312 | memcpy(s->pal, pal, AVPALETTE_SIZE); | |
313 | s->frame->palette_has_changed = 1; | |
314 | } | |
315 | } | |
316 | ||
317 | if (s->mode_8bit) | |
318 | msvideo1_decode_8bit(s); | |
319 | else | |
320 | msvideo1_decode_16bit(s); | |
321 | ||
322 | if ((ret = av_frame_ref(data, s->frame)) < 0) | |
323 | return ret; | |
324 | ||
325 | *got_frame = 1; | |
326 | ||
327 | /* report that the buffer was completely consumed */ | |
328 | return buf_size; | |
329 | } | |
330 | ||
331 | static av_cold int msvideo1_decode_end(AVCodecContext *avctx) | |
332 | { | |
333 | Msvideo1Context *s = avctx->priv_data; | |
334 | ||
335 | av_frame_free(&s->frame); | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
340 | AVCodec ff_msvideo1_decoder = { | |
341 | .name = "msvideo1", | |
342 | .long_name = NULL_IF_CONFIG_SMALL("Microsoft Video 1"), | |
343 | .type = AVMEDIA_TYPE_VIDEO, | |
344 | .id = AV_CODEC_ID_MSVIDEO1, | |
345 | .priv_data_size = sizeof(Msvideo1Context), | |
346 | .init = msvideo1_decode_init, | |
347 | .close = msvideo1_decode_end, | |
348 | .decode = msvideo1_decode_frame, | |
349 | .capabilities = CODEC_CAP_DR1, | |
350 | }; |