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path: root/libavcodec/cdxl.c (plain)
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1/*
2 * CDXL video decoder
3 * Copyright (c) 2011-2012 Paul B Mahol
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 * Commodore CDXL video decoder
25 * @author Paul B Mahol
26 */
27
28#define UNCHECKED_BITSTREAM_READER 1
29
30#include "libavutil/intreadwrite.h"
31#include "libavutil/imgutils.h"
32#include "avcodec.h"
33#include "bytestream.h"
34#include "get_bits.h"
35#include "internal.h"
36
37#define BIT_PLANAR 0x00
38#define CHUNKY 0x20
39#define BYTE_PLANAR 0x40
40#define BIT_LINE 0x80
41#define BYTE_LINE 0xC0
42
43typedef struct CDXLVideoContext {
44 AVCodecContext *avctx;
45 int bpp;
46 int format;
47 int padded_bits;
48 const uint8_t *palette;
49 int palette_size;
50 const uint8_t *video;
51 int video_size;
52 uint8_t *new_video;
53 int new_video_size;
54} CDXLVideoContext;
55
56static av_cold int cdxl_decode_init(AVCodecContext *avctx)
57{
58 CDXLVideoContext *c = avctx->priv_data;
59
60 c->new_video_size = 0;
61 c->avctx = avctx;
62
63 return 0;
64}
65
66static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
67{
68 int i;
69
70 for (i = 0; i < c->palette_size / 2; i++) {
71 unsigned rgb = AV_RB16(&c->palette[i * 2]);
72 unsigned r = ((rgb >> 8) & 0xF) * 0x11;
73 unsigned g = ((rgb >> 4) & 0xF) * 0x11;
74 unsigned b = (rgb & 0xF) * 0x11;
75 AV_WN32(&new_palette[i], (0xFFU << 24) | (r << 16) | (g << 8) | b);
76 }
77}
78
79static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
80{
81 GetBitContext gb;
82 int x, y, plane;
83
84 if (init_get_bits8(&gb, c->video, c->video_size) < 0)
85 return;
86 for (plane = 0; plane < c->bpp; plane++) {
87 for (y = 0; y < c->avctx->height; y++) {
88 for (x = 0; x < c->avctx->width; x++)
89 out[linesize * y + x] |= get_bits1(&gb) << plane;
90 skip_bits(&gb, c->padded_bits);
91 }
92 }
93}
94
95static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
96{
97 GetBitContext gb;
98 int x, y, plane;
99
100 if (init_get_bits8(&gb, c->video, c->video_size) < 0)
101 return;
102 for (y = 0; y < c->avctx->height; y++) {
103 for (plane = 0; plane < c->bpp; plane++) {
104 for (x = 0; x < c->avctx->width; x++)
105 out[linesize * y + x] |= get_bits1(&gb) << plane;
106 skip_bits(&gb, c->padded_bits);
107 }
108 }
109}
110
111static void chunky2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
112{
113 GetByteContext gb;
114 int y;
115
116 bytestream2_init(&gb, c->video, c->video_size);
117 for (y = 0; y < c->avctx->height; y++) {
118 bytestream2_get_buffer(&gb, out + linesize * y, c->avctx->width * 3);
119 }
120}
121
122static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
123{
124 memset(out, 0, linesize * c->avctx->height);
125
126 switch (c->format) {
127 case BIT_PLANAR:
128 bitplanar2chunky(c, linesize, out);
129 break;
130 case BIT_LINE:
131 bitline2chunky(c, linesize, out);
132 break;
133 case CHUNKY:
134 chunky2chunky(c, linesize, out);
135 break;
136 }
137}
138
139static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
140{
141 uint32_t *new_palette = (uint32_t *)frame->data[1];
142
143 memset(frame->data[1], 0, AVPALETTE_SIZE);
144 import_palette(c, new_palette);
145 import_format(c, frame->linesize[0], frame->data[0]);
146}
147
148static void cdxl_decode_raw(CDXLVideoContext *c, AVFrame *frame)
149{
150 import_format(c, frame->linesize[0], frame->data[0]);
151}
152
153static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
154{
155 AVCodecContext *avctx = c->avctx;
156 uint32_t new_palette[16], r, g, b;
157 uint8_t *ptr, *out, index, op;
158 int x, y;
159
160 ptr = c->new_video;
161 out = frame->data[0];
162
163 import_palette(c, new_palette);
164 import_format(c, avctx->width, c->new_video);
165
166 for (y = 0; y < avctx->height; y++) {
167 r = new_palette[0] & 0xFF0000;
168 g = new_palette[0] & 0xFF00;
169 b = new_palette[0] & 0xFF;
170 for (x = 0; x < avctx->width; x++) {
171 index = *ptr++;
172 op = index >> 4;
173 index &= 15;
174 switch (op) {
175 case 0:
176 r = new_palette[index] & 0xFF0000;
177 g = new_palette[index] & 0xFF00;
178 b = new_palette[index] & 0xFF;
179 break;
180 case 1:
181 b = index * 0x11;
182 break;
183 case 2:
184 r = index * 0x11 << 16;
185 break;
186 case 3:
187 g = index * 0x11 << 8;
188 break;
189 }
190 AV_WL24(out + x * 3, r | g | b);
191 }
192 out += frame->linesize[0];
193 }
194}
195
196static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
197{
198 AVCodecContext *avctx = c->avctx;
199 uint32_t new_palette[64], r, g, b;
200 uint8_t *ptr, *out, index, op;
201 int x, y;
202
203 ptr = c->new_video;
204 out = frame->data[0];
205
206 import_palette(c, new_palette);
207 import_format(c, avctx->width, c->new_video);
208
209 for (y = 0; y < avctx->height; y++) {
210 r = new_palette[0] & 0xFF0000;
211 g = new_palette[0] & 0xFF00;
212 b = new_palette[0] & 0xFF;
213 for (x = 0; x < avctx->width; x++) {
214 index = *ptr++;
215 op = index >> 6;
216 index &= 63;
217 switch (op) {
218 case 0:
219 r = new_palette[index] & 0xFF0000;
220 g = new_palette[index] & 0xFF00;
221 b = new_palette[index] & 0xFF;
222 break;
223 case 1:
224 b = (index << 2) | (b & 3);
225 break;
226 case 2:
227 r = (index << 18) | (r & (3 << 16));
228 break;
229 case 3:
230 g = (index << 10) | (g & (3 << 8));
231 break;
232 }
233 AV_WL24(out + x * 3, r | g | b);
234 }
235 out += frame->linesize[0];
236 }
237}
238
239static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
240 int *got_frame, AVPacket *pkt)
241{
242 CDXLVideoContext *c = avctx->priv_data;
243 AVFrame * const p = data;
244 int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
245 const uint8_t *buf = pkt->data;
246
247 if (buf_size < 32)
248 return AVERROR_INVALIDDATA;
249 encoding = buf[1] & 7;
250 c->format = buf[1] & 0xE0;
251 w = AV_RB16(&buf[14]);
252 h = AV_RB16(&buf[16]);
253 c->bpp = buf[19];
254 c->palette_size = AV_RB16(&buf[20]);
255 c->palette = buf + 32;
256 c->video = c->palette + c->palette_size;
257 c->video_size = buf_size - c->palette_size - 32;
258
259 if (c->palette_size > 512)
260 return AVERROR_INVALIDDATA;
261 if (buf_size < c->palette_size + 32)
262 return AVERROR_INVALIDDATA;
263 if (c->bpp < 1)
264 return AVERROR_INVALIDDATA;
265 if (c->format != BIT_PLANAR && c->format != BIT_LINE && c->format != CHUNKY) {
266 avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);
267 return AVERROR_PATCHWELCOME;
268 }
269
270 if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
271 return ret;
272
273 if (c->format == CHUNKY)
274 aligned_width = avctx->width;
275 else
276 aligned_width = FFALIGN(c->avctx->width, 16);
277 c->padded_bits = aligned_width - c->avctx->width;
278 if (c->video_size < aligned_width * avctx->height * c->bpp / 8)
279 return AVERROR_INVALIDDATA;
280 if (!encoding && c->palette_size && c->bpp <= 8) {
281 avctx->pix_fmt = AV_PIX_FMT_PAL8;
282 } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8)) {
283 if (c->palette_size != (1 << (c->bpp - 1)))
284 return AVERROR_INVALIDDATA;
285 avctx->pix_fmt = AV_PIX_FMT_BGR24;
286 } else if (!encoding && c->bpp == 24 && c->format == CHUNKY &&
287 !c->palette_size) {
288 avctx->pix_fmt = AV_PIX_FMT_RGB24;
289 } else {
290 avpriv_request_sample(avctx, "Encoding %d, bpp %d and format 0x%x",
291 encoding, c->bpp, c->format);
292 return AVERROR_PATCHWELCOME;
293 }
294
295 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
296 return ret;
297 p->pict_type = AV_PICTURE_TYPE_I;
298
299 if (encoding) {
300 av_fast_padded_malloc(&c->new_video, &c->new_video_size,
301 h * w + AV_INPUT_BUFFER_PADDING_SIZE);
302 if (!c->new_video)
303 return AVERROR(ENOMEM);
304 if (c->bpp == 8)
305 cdxl_decode_ham8(c, p);
306 else
307 cdxl_decode_ham6(c, p);
308 } else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
309 cdxl_decode_rgb(c, p);
310 } else {
311 cdxl_decode_raw(c, p);
312 }
313 *got_frame = 1;
314
315 return buf_size;
316}
317
318static av_cold int cdxl_decode_end(AVCodecContext *avctx)
319{
320 CDXLVideoContext *c = avctx->priv_data;
321
322 av_freep(&c->new_video);
323
324 return 0;
325}
326
327AVCodec ff_cdxl_decoder = {
328 .name = "cdxl",
329 .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
330 .type = AVMEDIA_TYPE_VIDEO,
331 .id = AV_CODEC_ID_CDXL,
332 .priv_data_size = sizeof(CDXLVideoContext),
333 .init = cdxl_decode_init,
334 .close = cdxl_decode_end,
335 .decode = cdxl_decode_frame,
336 .capabilities = AV_CODEC_CAP_DR1,
337};
338
generated by cgit at 2024-05-17 05:12:33 (GMT)