FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/cdxl.c
Date: 2025-10-19 14:07:46
Exec Total Coverage
Lines: 157 192 81.8%
Functions: 10 12 83.3%
Branches: 69 112 61.6%
Line Branch Exec Source
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/mem.h"
32 #include "avcodec.h"
33 #include "bytestream.h"
34 #include "codec_internal.h"
35 #include "decode.h"
36 #include "get_bits.h"
37
38 #define BIT_PLANAR 0x00
39 #define CHUNKY 0x20
40 #define BYTE_PLANAR 0x40
41 #define BIT_LINE 0x80
42 #define BYTE_LINE 0xC0
43
44 typedef struct CDXLVideoContext {
45 AVCodecContext *avctx;
46 int bpp;
47 int type;
48 int format;
49 int padded_bits;
50 const uint8_t *palette;
51 int palette_size;
52 const uint8_t *video;
53 int video_size;
54 uint8_t *new_video;
55 int new_video_size;
56 } CDXLVideoContext;
57
58 11 static av_cold int cdxl_decode_init(AVCodecContext *avctx)
59 {
60 11 CDXLVideoContext *c = avctx->priv_data;
61
62 11 c->new_video_size = 0;
63 11 c->avctx = avctx;
64
65 11 return 0;
66 }
67
68 92 static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
69 {
70
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 92 if (c->type == 1) {
71
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 4684 for (int i = 0; i < c->palette_size / 2; i++) {
72 4592 unsigned rgb = AV_RB16(&c->palette[i * 2]);
73 4592 unsigned r = ((rgb >> 8) & 0xF) * 0x11;
74 4592 unsigned g = ((rgb >> 4) & 0xF) * 0x11;
75 4592 unsigned b = (rgb & 0xF) * 0x11;
76 4592 AV_WN32(&new_palette[i], (0xFFU << 24) | (r << 16) | (g << 8) | b);
77 }
78 } else {
79 ✗ for (int i = 0; i < c->palette_size / 3; i++) {
80 ✗ unsigned rgb = AV_RB24(&c->palette[i * 3]);
81 ✗ AV_WN32(&new_palette[i], (0xFFU << 24) | rgb);
82 }
83 }
84 92 }
85
86 81 static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
87 {
88 GetBitContext gb;
89 int x, y, plane;
90
91
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 81 if (init_get_bits8(&gb, c->video, c->video_size) < 0)
92 ✗ return;
93
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 507 for (plane = 0; plane < c->bpp; plane++) {
94
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 45114 for (y = 0; y < c->avctx->height; y++) {
95
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 6992016 for (x = 0; x < c->avctx->width; x++)
96 6947328 out[linesize * y + x] |= get_bits1(&gb) << plane;
97 44688 skip_bits(&gb, c->padded_bits);
98 }
99 }
100 }
101
102 11 static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
103 {
104 GetBitContext gb;
105 int x, y, plane;
106
107
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 11 if (init_get_bits8(&gb, c->video, c->video_size) < 0)
108 ✗ return;
109
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 1441 for (y = 0; y < c->avctx->height; y++) {
110
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 10010 for (plane = 0; plane < c->bpp; plane++) {
111
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 1398540 for (x = 0; x < c->avctx->width; x++)
112 1389960 out[linesize * y + x] |= get_bits1(&gb) << plane;
113 8580 skip_bits(&gb, c->padded_bits);
114 }
115 }
116 }
117
118 ✗ static void chunky2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
119 {
120 GetByteContext gb;
121 int y;
122
123 ✗ bytestream2_init(&gb, c->video, c->video_size);
124 ✗ for (y = 0; y < c->avctx->height; y++) {
125 ✗ bytestream2_get_buffer(&gb, out + linesize * y, c->avctx->width * 3);
126 }
127 ✗ }
128
129 92 static void import_format(CDXLVideoContext *c, ptrdiff_t linesize, uint8_t *out)
130 {
131
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 9498 for (int y = 0; y < c->avctx->height; y++)
132 9406 memset(out + y * linesize, 0, c->avctx->width);
133
134
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 92 switch (c->format) {
135 81 case BIT_PLANAR:
136 81 bitplanar2chunky(c, linesize, out);
137 81 break;
138 11 case BIT_LINE:
139 11 bitline2chunky(c, linesize, out);
140 11 break;
141 ✗ case CHUNKY:
142 ✗ chunky2chunky(c, linesize, out);
143 ✗ break;
144 }
145 92 }
146
147 59 static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
148 {
149 59 uint32_t *new_palette = (uint32_t *)frame->data[1];
150
151 59 memset(frame->data[1], 0, AVPALETTE_SIZE);
152 59 import_palette(c, new_palette);
153 59 import_format(c, frame->linesize[0], frame->data[0]);
154 59 }
155
156 ✗ static void cdxl_decode_raw(CDXLVideoContext *c, AVFrame *frame)
157 {
158 ✗ import_format(c, frame->linesize[0], frame->data[0]);
159 ✗ }
160
161 28 static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
162 {
163 28 AVCodecContext *avctx = c->avctx;
164 uint32_t new_palette[16], r, g, b;
165 uint8_t *ptr, *out, index, op;
166 int x, y;
167
168 28 ptr = c->new_video;
169 28 out = frame->data[0];
170
171 28 import_palette(c, new_palette);
172 28 import_format(c, avctx->width, c->new_video);
173
174
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 3498 for (y = 0; y < avctx->height; y++) {
175 3470 r = new_palette[0] & 0xFF0000;
176 3470 g = new_palette[0] & 0xFF00;
177 3470 b = new_palette[0] & 0xFF;
178
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 561530 for (x = 0; x < avctx->width; x++) {
179 558060 index = *ptr++;
180 558060 op = index >> 4;
181 558060 index &= 15;
182
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 558060 switch (op) {
183 131279 case 0:
184 131279 r = new_palette[index] & 0xFF0000;
185 131279 g = new_palette[index] & 0xFF00;
186 131279 b = new_palette[index] & 0xFF;
187 131279 break;
188 108493 case 1:
189 108493 b = index * 0x11;
190 108493 break;
191 212370 case 2:
192 212370 r = index * 0x11 << 16;
193 212370 break;
194 105918 case 3:
195 105918 g = index * 0x11 << 8;
196 105918 break;
197 }
198 558060 AV_WL24(out + x * 3, r | g | b);
199 }
200 3470 out += frame->linesize[0];
201 }
202 28 }
203
204 5 static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
205 {
206 5 AVCodecContext *avctx = c->avctx;
207 uint32_t new_palette[64], r, g, b;
208 uint8_t *ptr, *out, index, op;
209 int x, y;
210
211 5 ptr = c->new_video;
212 5 out = frame->data[0];
213
214 5 import_palette(c, new_palette);
215 5 import_format(c, avctx->width, c->new_video);
216
217
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 645 for (y = 0; y < avctx->height; y++) {
218 640 r = new_palette[0] & 0xFF0000;
219 640 g = new_palette[0] & 0xFF00;
220 640 b = new_palette[0] & 0xFF;
221
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 113280 for (x = 0; x < avctx->width; x++) {
222 112640 index = *ptr++;
223 112640 op = index >> 6;
224 112640 index &= 63;
225
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 112640 switch (op) {
226 5695 case 0:
227 5695 r = new_palette[index] & 0xFF0000;
228 5695 g = new_palette[index] & 0xFF00;
229 5695 b = new_palette[index] & 0xFF;
230 5695 break;
231 1045 case 1:
232 1045 b = (index << 2) | (b & 3);
233 1045 break;
234 1870 case 2:
235 1870 r = (index << 18) | (r & (3 << 16));
236 1870 break;
237 104030 case 3:
238 104030 g = (index << 10) | (g & (3 << 8));
239 104030 break;
240 }
241 112640 AV_WL24(out + x * 3, r | g | b);
242 }
243 640 out += frame->linesize[0];
244 }
245 5 }
246
247 95 static int cdxl_decode_frame(AVCodecContext *avctx, AVFrame *p,
248 int *got_frame, AVPacket *pkt)
249 {
250 95 CDXLVideoContext *c = avctx->priv_data;
251 95 int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
252 95 const uint8_t *buf = pkt->data;
253
254
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 95 if (buf_size < 32)
255 ✗ return AVERROR_INVALIDDATA;
256 95 c->type = buf[0];
257 95 encoding = buf[1] & 7;
258 95 c->format = buf[1] & 0xE0;
259 95 w = AV_RB16(&buf[14]);
260 95 h = AV_RB16(&buf[16]);
261 95 c->bpp = buf[19];
262 95 c->palette_size = AV_RB16(&buf[20]);
263 95 c->palette = buf + 32;
264 95 c->video = c->palette + c->palette_size;
265 95 c->video_size = buf_size - c->palette_size - 32;
266
267
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 95 if (c->type > 1)
268 ✗ return AVERROR_INVALIDDATA;
269
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 95 if (c->type == 1 && c->palette_size > 512)
270 ✗ return AVERROR_INVALIDDATA;
271
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 95 if (c->type == 0 && c->palette_size > 768)
272 ✗ return AVERROR_INVALIDDATA;
273
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 95 if (buf_size < c->palette_size + 32)
274 ✗ return AVERROR_INVALIDDATA;
275
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 95 if (c->bpp < 1)
276 ✗ return AVERROR_INVALIDDATA;
277
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 95 if (c->format != BIT_PLANAR && c->format != BIT_LINE && c->format != CHUNKY) {
278 ✗ avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);
279 ✗ return AVERROR_PATCHWELCOME;
280 }
281
282
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 95 if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
283 ✗ return ret;
284
285
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 95 if (c->format == CHUNKY)
286 ✗ aligned_width = avctx->width;
287 else
288 95 aligned_width = FFALIGN(c->avctx->width, 16);
289 95 c->padded_bits = aligned_width - c->avctx->width;
290
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 95 if (c->video_size < aligned_width * avctx->height * (int64_t)c->bpp / 8)
291 3 return AVERROR_INVALIDDATA;
292
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 92 if (!encoding && c->palette_size && c->bpp <= 8 && c->format != CHUNKY) {
293 59 avctx->pix_fmt = AV_PIX_FMT_PAL8;
294
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 33 } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8) && c->format != CHUNKY) {
295
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 33 if (c->palette_size != (1 << (c->bpp - 1)))
296 ✗ return AVERROR_INVALIDDATA;
297 33 avctx->pix_fmt = AV_PIX_FMT_BGR24;
298 ✗ } else if (!encoding && c->bpp == 24 && c->format == CHUNKY &&
299 ✗ !c->palette_size) {
300 ✗ avctx->pix_fmt = AV_PIX_FMT_RGB24;
301 } else {
302 ✗ avpriv_request_sample(avctx, "Encoding %d, bpp %d and format 0x%x",
303 encoding, c->bpp, c->format);
304 ✗ return AVERROR_PATCHWELCOME;
305 }
306
307
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 92 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
308 ✗ return ret;
309
310
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 92 if (encoding) {
311 33 av_fast_padded_malloc(&c->new_video, &c->new_video_size,
312 33 h * w + AV_INPUT_BUFFER_PADDING_SIZE);
313
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 33 if (!c->new_video)
314 ✗ return AVERROR(ENOMEM);
315
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 33 if (c->bpp == 8)
316 5 cdxl_decode_ham8(c, p);
317 else
318 28 cdxl_decode_ham6(c, p);
319
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 59 } else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
320 59 cdxl_decode_rgb(c, p);
321 } else {
322 ✗ cdxl_decode_raw(c, p);
323 }
324 92 *got_frame = 1;
325
326 92 return buf_size;
327 }
328
329 11 static av_cold int cdxl_decode_end(AVCodecContext *avctx)
330 {
331 11 CDXLVideoContext *c = avctx->priv_data;
332
333 11 av_freep(&c->new_video);
334
335 11 return 0;
336 }
337
338 const FFCodec ff_cdxl_decoder = {
339 .p.name = "cdxl",
340 CODEC_LONG_NAME("Commodore CDXL video"),
341 .p.type = AVMEDIA_TYPE_VIDEO,
342 .p.id = AV_CODEC_ID_CDXL,
343 .priv_data_size = sizeof(CDXLVideoContext),
344 .init = cdxl_decode_init,
345 .close = cdxl_decode_end,
346 FF_CODEC_DECODE_CB(cdxl_decode_frame),
347 .p.capabilities = AV_CODEC_CAP_DR1,
348 };
349