0b3d59cb80cabb321341a67166b6b09698cd39bc
[libav.git] / libavcodec / cdxl.c
1 /*
2 * CDXL video decoder
3 * Copyright (c) 2011-2012 Paul B Mahol
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/intreadwrite.h"
23 #include "libavutil/imgutils.h"
24 #include "avcodec.h"
25 #include "get_bits.h"
26 #include "internal.h"
27
28 #define BIT_PLANAR 0x00
29 #define BYTE_PLANAR 0x20
30 #define CHUNKY 0x40
31 #define BIT_LINE 0x80
32 #define BYTE_LINE 0xC0
33
34 typedef struct {
35 AVCodecContext *avctx;
36 AVFrame frame;
37 int bpp;
38 int format;
39 int padded_bits;
40 const uint8_t *palette;
41 int palette_size;
42 const uint8_t *video;
43 int video_size;
44 uint8_t *new_video;
45 int new_video_size;
46 } CDXLVideoContext;
47
48 static av_cold int cdxl_decode_init(AVCodecContext *avctx)
49 {
50 CDXLVideoContext *c = avctx->priv_data;
51
52 avcodec_get_frame_defaults(&c->frame);
53 c->new_video_size = 0;
54 c->avctx = avctx;
55
56 return 0;
57 }
58
59 static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
60 {
61 int i;
62
63 for (i = 0; i < c->palette_size / 2; i++) {
64 unsigned rgb = AV_RB16(&c->palette[i * 2]);
65 unsigned r = ((rgb >> 8) & 0xF) * 0x11;
66 unsigned g = ((rgb >> 4) & 0xF) * 0x11;
67 unsigned b = (rgb & 0xF) * 0x11;
68 AV_WN32(&new_palette[i], (r << 16) | (g << 8) | b);
69 }
70 }
71
72 static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
73 {
74 GetBitContext gb;
75 int x, y, plane;
76
77 init_get_bits(&gb, c->video, c->video_size * 8);
78 for (plane = 0; plane < c->bpp; plane++) {
79 for (y = 0; y < c->avctx->height; y++) {
80 for (x = 0; x < c->avctx->width; x++)
81 out[linesize * y + x] |= get_bits1(&gb) << plane;
82 skip_bits(&gb, c->padded_bits);
83 }
84 }
85 }
86
87 static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
88 {
89 GetBitContext gb;
90 int x, y, plane;
91
92 init_get_bits(&gb, c->video, c->video_size * 8);
93 for (y = 0; y < c->avctx->height; y++) {
94 for (plane = 0; plane < c->bpp; plane++) {
95 for (x = 0; x < c->avctx->width; x++)
96 out[linesize * y + x] |= get_bits1(&gb) << plane;
97 skip_bits(&gb, c->padded_bits);
98 }
99 }
100 }
101
102 static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
103 {
104 memset(out, 0, linesize * c->avctx->height);
105
106 switch (c->format) {
107 case BIT_PLANAR:
108 bitplanar2chunky(c, linesize, out);
109 break;
110 case BIT_LINE:
111 bitline2chunky(c, linesize, out);
112 break;
113 }
114 }
115
116 static void cdxl_decode_rgb(CDXLVideoContext *c)
117 {
118 uint32_t *new_palette = (uint32_t *)c->frame.data[1];
119
120 import_palette(c, new_palette);
121 import_format(c, c->frame.linesize[0], c->frame.data[0]);
122 }
123
124 static void cdxl_decode_ham6(CDXLVideoContext *c)
125 {
126 AVCodecContext *avctx = c->avctx;
127 uint32_t new_palette[16], r, g, b;
128 uint8_t *ptr, *out, index, op;
129 int x, y;
130
131 ptr = c->new_video;
132 out = c->frame.data[0];
133
134 import_palette(c, new_palette);
135 import_format(c, avctx->width, c->new_video);
136
137 for (y = 0; y < avctx->height; y++) {
138 r = new_palette[0] & 0xFF0000;
139 g = new_palette[0] & 0xFF00;
140 b = new_palette[0] & 0xFF;
141 for (x = 0; x < avctx->width; x++) {
142 index = *ptr++;
143 op = index >> 4;
144 index &= 15;
145 switch (op) {
146 case 0:
147 r = new_palette[index] & 0xFF0000;
148 g = new_palette[index] & 0xFF00;
149 b = new_palette[index] & 0xFF;
150 break;
151 case 1:
152 b = index * 0x11;
153 break;
154 case 2:
155 r = index * 0x11 << 16;
156 break;
157 case 3:
158 g = index * 0x11 << 8;
159 break;
160 }
161 AV_WL24(out + x * 3, r | g | b);
162 }
163 out += c->frame.linesize[0];
164 }
165 }
166
167 static void cdxl_decode_ham8(CDXLVideoContext *c)
168 {
169 AVCodecContext *avctx = c->avctx;
170 uint32_t new_palette[64], r, g, b;
171 uint8_t *ptr, *out, index, op;
172 int x, y;
173
174 ptr = c->new_video;
175 out = c->frame.data[0];
176
177 import_palette(c, new_palette);
178 import_format(c, avctx->width, c->new_video);
179
180 for (y = 0; y < avctx->height; y++) {
181 r = new_palette[0] & 0xFF0000;
182 g = new_palette[0] & 0xFF00;
183 b = new_palette[0] & 0xFF;
184 for (x = 0; x < avctx->width; x++) {
185 index = *ptr++;
186 op = index >> 6;
187 index &= 63;
188 switch (op) {
189 case 0:
190 r = new_palette[index] & 0xFF0000;
191 g = new_palette[index] & 0xFF00;
192 b = new_palette[index] & 0xFF;
193 break;
194 case 1:
195 b = (index << 2) | (b & 3);
196 break;
197 case 2:
198 r = (index << 18) | (r & (3 << 16));
199 break;
200 case 3:
201 g = (index << 10) | (g & (3 << 8));
202 break;
203 }
204 AV_WL24(out + x * 3, r | g | b);
205 }
206 out += c->frame.linesize[0];
207 }
208 }
209
210 static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
211 int *got_frame, AVPacket *pkt)
212 {
213 CDXLVideoContext *c = avctx->priv_data;
214 AVFrame * const p = &c->frame;
215 int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
216 const uint8_t *buf = pkt->data;
217
218 if (buf_size < 32)
219 return AVERROR_INVALIDDATA;
220 encoding = buf[1] & 7;
221 c->format = buf[1] & 0xE0;
222 w = AV_RB16(&buf[14]);
223 h = AV_RB16(&buf[16]);
224 c->bpp = buf[19];
225 c->palette_size = AV_RB16(&buf[20]);
226 c->palette = buf + 32;
227 c->video = c->palette + c->palette_size;
228 c->video_size = buf_size - c->palette_size - 32;
229
230 if (c->palette_size > 512)
231 return AVERROR_INVALIDDATA;
232 if (buf_size < c->palette_size + 32)
233 return AVERROR_INVALIDDATA;
234 if (c->bpp < 1)
235 return AVERROR_INVALIDDATA;
236 if (c->format != BIT_PLANAR && c->format != BIT_LINE) {
237 av_log_ask_for_sample(avctx, "unsupported pixel format: 0x%0x\n", c->format);
238 return AVERROR_PATCHWELCOME;
239 }
240
241 if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
242 return ret;
243 if (w != avctx->width || h != avctx->height)
244 avcodec_set_dimensions(avctx, w, h);
245
246 aligned_width = FFALIGN(c->avctx->width, 16);
247 c->padded_bits = aligned_width - c->avctx->width;
248 if (c->video_size < aligned_width * avctx->height * c->bpp / 8)
249 return AVERROR_INVALIDDATA;
250 if (!encoding && c->palette_size && c->bpp <= 8) {
251 avctx->pix_fmt = AV_PIX_FMT_PAL8;
252 } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) {
253 if (c->palette_size != (1 << (c->bpp - 1)))
254 return AVERROR_INVALIDDATA;
255 avctx->pix_fmt = AV_PIX_FMT_BGR24;
256 } else {
257 av_log_ask_for_sample(avctx, "unsupported encoding %d and bpp %d\n",
258 encoding, c->bpp);
259 return AVERROR_PATCHWELCOME;
260 }
261
262 if (p->data[0])
263 avctx->release_buffer(avctx, p);
264
265 p->reference = 0;
266 if ((ret = ff_get_buffer(avctx, p)) < 0) {
267 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
268 return ret;
269 }
270 p->pict_type = AV_PICTURE_TYPE_I;
271
272 if (encoding) {
273 av_fast_padded_malloc(&c->new_video, &c->new_video_size,
274 h * w + FF_INPUT_BUFFER_PADDING_SIZE);
275 if (!c->new_video)
276 return AVERROR(ENOMEM);
277 if (c->bpp == 8)
278 cdxl_decode_ham8(c);
279 else
280 cdxl_decode_ham6(c);
281 } else {
282 cdxl_decode_rgb(c);
283 }
284 *got_frame = 1;
285 *(AVFrame*)data = c->frame;
286
287 return buf_size;
288 }
289
290 static av_cold int cdxl_decode_end(AVCodecContext *avctx)
291 {
292 CDXLVideoContext *c = avctx->priv_data;
293
294 av_free(c->new_video);
295 if (c->frame.data[0])
296 avctx->release_buffer(avctx, &c->frame);
297
298 return 0;
299 }
300
301 AVCodec ff_cdxl_decoder = {
302 .name = "cdxl",
303 .type = AVMEDIA_TYPE_VIDEO,
304 .id = AV_CODEC_ID_CDXL,
305 .priv_data_size = sizeof(CDXLVideoContext),
306 .init = cdxl_decode_init,
307 .close = cdxl_decode_end,
308 .decode = cdxl_decode_frame,
309 .capabilities = CODEC_CAP_DR1,
310 .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
311 };