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1 | /* |
2 | * Silicon Graphics Motion Video Compressor 1 & 2 decoder | |
3 | * Copyright (c) 2012 Peter Ross | |
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 | * Silicon Graphics Motion Video Compressor 1 & 2 decoder | |
25 | */ | |
26 | ||
27 | #include "libavutil/intreadwrite.h" | |
28 | ||
29 | #include "avcodec.h" | |
30 | #include "bytestream.h" | |
31 | #include "internal.h" | |
32 | ||
33 | typedef struct MvcContext { | |
34 | AVFrame *frame; | |
35 | int vflip; | |
36 | } MvcContext; | |
37 | ||
38 | static av_cold int mvc_decode_init(AVCodecContext *avctx) | |
39 | { | |
40 | MvcContext *s = avctx->priv_data; | |
41 | int width = avctx->width; | |
42 | int height = avctx->height; | |
43 | int ret; | |
44 | ||
45 | if (avctx->codec_id == AV_CODEC_ID_MVC1) { | |
46 | width += 3; | |
47 | height += 3; | |
48 | } | |
49 | width &= ~3; | |
50 | height &= ~3; | |
51 | if ((ret = ff_set_dimensions(avctx, width, height)) < 0) | |
52 | return ret; | |
53 | ||
54 | avctx->pix_fmt = (avctx->codec_id == AV_CODEC_ID_MVC1) ? AV_PIX_FMT_RGB555 | |
55 | : AV_PIX_FMT_RGB32; | |
56 | s->frame = av_frame_alloc(); | |
57 | if (!s->frame) | |
58 | return AVERROR(ENOMEM); | |
59 | ||
60 | s->vflip = avctx->extradata_size >= 9 && | |
61 | !memcmp(avctx->extradata + avctx->extradata_size - 9, "BottomUp", 9); | |
62 | return 0; | |
63 | } | |
64 | ||
65 | static int decode_mvc1(AVCodecContext *avctx, GetByteContext *gb, | |
66 | uint8_t *dst_start, int width, int height, int linesize) | |
67 | { | |
68 | uint8_t *dst; | |
69 | uint16_t v[8]; | |
70 | int mask, x, y, i; | |
71 | ||
72 | for (y = 0; y < height; y += 4) { | |
73 | for (x = 0; x < width; x += 4) { | |
74 | if (bytestream2_get_bytes_left(gb) < 6) | |
75 | return 0; | |
76 | ||
77 | mask = bytestream2_get_be16u(gb); | |
78 | v[0] = bytestream2_get_be16u(gb); | |
79 | v[1] = bytestream2_get_be16u(gb); | |
80 | if ((v[0] & 0x8000)) { | |
81 | if (bytestream2_get_bytes_left(gb) < 12) { | |
82 | av_log(avctx, AV_LOG_WARNING, "buffer overflow\n"); | |
83 | return AVERROR_INVALIDDATA; | |
84 | } | |
85 | for (i = 2; i < 8; i++) | |
86 | v[i] = bytestream2_get_be16u(gb); | |
87 | } else { | |
88 | v[2] = v[4] = v[6] = v[0]; | |
89 | v[3] = v[5] = v[7] = v[1]; | |
90 | } | |
91 | ||
92 | #define PIX16(target, true, false) \ | |
93 | i = (mask & target) ? true : false; \ | |
94 | AV_WN16A(dst, v[i] & 0x7FFF); \ | |
95 | dst += 2; | |
96 | ||
97 | #define ROW16(row, a1, a0, b1, b0) \ | |
98 | dst = dst_start + (y + row) * linesize + x * 2; \ | |
99 | PIX16(1 << (row * 4), a1, a0) \ | |
100 | PIX16(1 << (row * 4 + 1), a1, a0) \ | |
101 | PIX16(1 << (row * 4 + 2), b1, b0) \ | |
102 | PIX16(1 << (row * 4 + 3), b1, b0) | |
103 | ||
104 | ROW16(0, 0, 1, 2, 3); | |
105 | ROW16(1, 0, 1, 2, 3); | |
106 | ROW16(2, 4, 5, 6, 7); | |
107 | ROW16(3, 4, 5, 6, 7); | |
108 | } | |
109 | } | |
110 | return 0; | |
111 | } | |
112 | ||
113 | static void set_4x4_block(uint8_t *dst, int linesize, uint32_t pixel) | |
114 | { | |
115 | int i, j; | |
116 | for (j = 0; j < 4; j++) | |
117 | for (i = 0; i < 4; i++) | |
118 | AV_WN32A(dst + j * linesize + i * 4, pixel); | |
119 | } | |
120 | ||
121 | #define PIX32(target, true, false) \ | |
122 | AV_WN32A(dst, (mask & target) ? v[true] : v[false]); \ | |
123 | dst += 4; | |
124 | ||
125 | #define ROW32(row, a1, a0, b1, b0) \ | |
126 | dst = dst_start + (y + row) * linesize + x * 4; \ | |
127 | PIX32(1 << (row * 4), a1, a0) \ | |
128 | PIX32(1 << (row * 4 + 1), a1, a0) \ | |
129 | PIX32(1 << (row * 4 + 2), b1, b0) \ | |
130 | PIX32(1 << (row * 4 + 3), b1, b0) | |
131 | ||
132 | #define MVC2_BLOCK \ | |
133 | ROW32(0, 1, 0, 3, 2); \ | |
134 | ROW32(1, 1, 0, 3, 2); \ | |
135 | ROW32(2, 5, 4, 7, 6); \ | |
136 | ROW32(3, 5, 4, 7, 6); | |
137 | ||
138 | static int decode_mvc2(AVCodecContext *avctx, GetByteContext *gb, | |
139 | uint8_t *dst_start, int width, int height, | |
140 | int linesize, int vflip) | |
141 | { | |
142 | uint8_t *dst; | |
143 | uint32_t color[128], v[8]; | |
144 | int w, h, nb_colors, i, x, y, p0, p1, mask; | |
145 | ||
146 | if (bytestream2_get_bytes_left(gb) < 6) | |
147 | return AVERROR_INVALIDDATA; | |
148 | ||
149 | w = bytestream2_get_be16u(gb); | |
150 | h = bytestream2_get_be16u(gb); | |
151 | if ((w & ~3) != width || (h & ~3) != height) | |
152 | av_log(avctx, AV_LOG_WARNING, "dimension mismatch\n"); | |
153 | ||
154 | if (bytestream2_get_byteu(gb)) { | |
155 | avpriv_request_sample(avctx, "bitmap feature"); | |
156 | return AVERROR_PATCHWELCOME; | |
157 | } | |
158 | ||
159 | nb_colors = bytestream2_get_byteu(gb); | |
160 | if (bytestream2_get_bytes_left(gb) < nb_colors * 3) | |
161 | return AVERROR_INVALIDDATA; | |
162 | for (i = 0; i < FFMIN(nb_colors, 128); i++) | |
163 | color[i] = 0xFF000000 | bytestream2_get_be24u(gb); | |
164 | if (nb_colors > 128) | |
165 | bytestream2_skip(gb, (nb_colors - 128) * 3); | |
166 | ||
167 | if (vflip) { | |
168 | dst_start += (height - 1) * linesize; | |
169 | linesize = -linesize; | |
170 | } | |
171 | x = y = 0; | |
172 | while (bytestream2_get_bytes_left(gb) >= 1) { | |
173 | p0 = bytestream2_get_byteu(gb); | |
174 | if ((p0 & 0x80)) { | |
175 | if ((p0 & 0x40)) { | |
176 | p0 &= 0x3F; | |
177 | p0 = (p0 << 2) | (p0 >> 4); | |
178 | set_4x4_block(dst_start + y * linesize + x * 4, linesize, | |
179 | 0xFF000000 | (p0 << 16) | (p0 << 8) | p0); | |
180 | } else { | |
181 | int g, r; | |
182 | p0 &= 0x3F; | |
183 | p0 = (p0 << 2) | (p0 >> 4); | |
184 | if (bytestream2_get_bytes_left(gb) < 2) | |
185 | return AVERROR_INVALIDDATA; | |
186 | g = bytestream2_get_byteu(gb); | |
187 | r = bytestream2_get_byteu(gb); | |
188 | set_4x4_block(dst_start + y * linesize + x * 4, linesize, | |
189 | 0xFF000000 | (r << 16) | (g << 8) | p0); | |
190 | } | |
191 | } else { | |
192 | if (bytestream2_get_bytes_left(gb) < 1) | |
193 | return AVERROR_INVALIDDATA; | |
194 | p1 = bytestream2_get_byteu(gb); | |
195 | if ((p1 & 0x80)) { | |
196 | if ((p0 & 0x7F) == (p1 & 0x7F)) { | |
197 | set_4x4_block(dst_start + y * linesize + x * 4, linesize, | |
198 | color[p0 & 0x7F]); | |
199 | } else { | |
200 | if (bytestream2_get_bytes_left(gb) < 2) | |
201 | return AVERROR_INVALIDDATA; | |
202 | v[0] = v[2] = v[4] = v[6] = color[p0 & 0x7F]; | |
203 | v[1] = v[3] = v[5] = v[7] = color[p1 & 0x7F]; | |
204 | mask = bytestream2_get_le16u(gb); | |
205 | MVC2_BLOCK | |
206 | } | |
207 | } else { | |
208 | if (bytestream2_get_bytes_left(gb) < 8) | |
209 | return AVERROR_INVALIDDATA; | |
210 | v[0] = color[p0 & 0x7F]; | |
211 | v[1] = color[p1 & 0x7F]; | |
212 | for (i = 2; i < 8; i++) | |
213 | v[i] = color[bytestream2_get_byteu(gb) & 0x7F]; | |
214 | mask = bytestream2_get_le16u(gb); | |
215 | MVC2_BLOCK | |
216 | } | |
217 | } | |
218 | ||
219 | x += 4; | |
220 | if (x >= width) { | |
221 | y += 4; | |
222 | if (y >= height) | |
223 | break; | |
224 | x = 0; | |
225 | } | |
226 | } | |
227 | return 0; | |
228 | } | |
229 | ||
230 | static int mvc_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, | |
231 | AVPacket *avpkt) | |
232 | { | |
233 | MvcContext *s = avctx->priv_data; | |
234 | GetByteContext gb; | |
235 | int ret; | |
236 | ||
237 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) | |
238 | return ret; | |
239 | ||
240 | bytestream2_init(&gb, avpkt->data, avpkt->size); | |
241 | if (avctx->codec_id == AV_CODEC_ID_MVC1) | |
242 | ret = decode_mvc1(avctx, &gb, s->frame->data[0], | |
243 | avctx->width, avctx->height, s->frame->linesize[0]); | |
244 | else | |
245 | ret = decode_mvc2(avctx, &gb, s->frame->data[0], | |
246 | avctx->width, avctx->height, s->frame->linesize[0], | |
247 | s->vflip); | |
248 | if (ret < 0) | |
249 | return ret; | |
250 | ||
251 | *got_frame = 1; | |
252 | if ((ret = av_frame_ref(data, s->frame)) < 0) | |
253 | return ret; | |
254 | ||
255 | return avpkt->size; | |
256 | } | |
257 | ||
258 | static av_cold int mvc_decode_end(AVCodecContext *avctx) | |
259 | { | |
260 | MvcContext *s = avctx->priv_data; | |
261 | ||
262 | av_frame_free(&s->frame); | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | #if CONFIG_MVC1_DECODER | |
268 | AVCodec ff_mvc1_decoder = { | |
269 | .name = "mvc1", | |
270 | .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 1"), | |
271 | .type = AVMEDIA_TYPE_VIDEO, | |
272 | .id = AV_CODEC_ID_MVC1, | |
273 | .priv_data_size = sizeof(MvcContext), | |
274 | .init = mvc_decode_init, | |
275 | .close = mvc_decode_end, | |
276 | .decode = mvc_decode_frame, | |
277 | .capabilities = CODEC_CAP_DR1, | |
278 | }; | |
279 | #endif | |
280 | ||
281 | #if CONFIG_MVC2_DECODER | |
282 | AVCodec ff_mvc2_decoder = { | |
283 | .name = "mvc2", | |
284 | .long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Motion Video Compressor 2"), | |
285 | .type = AVMEDIA_TYPE_VIDEO, | |
286 | .id = AV_CODEC_ID_MVC2, | |
287 | .priv_data_size = sizeof(MvcContext), | |
288 | .init = mvc_decode_init, | |
289 | .close = mvc_decode_end, | |
290 | .decode = mvc_decode_frame, | |
291 | .capabilities = CODEC_CAP_DR1, | |
292 | }; | |
293 | #endif |