FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/cdxl.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 158 192 82.3%
Branches: 66 110 60.0%
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/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
43 typedef struct CDXLVideoContext {
44 AVCodecContext *avctx;
45 int bpp;
46 int type;
47 int format;
48 int padded_bits;
49 const uint8_t *palette;
50 int palette_size;
51 const uint8_t *video;
52 int video_size;
53 uint8_t *new_video;
54 int new_video_size;
55 } CDXLVideoContext;
56
57 11 static av_cold int cdxl_decode_init(AVCodecContext *avctx)
58 {
59 11 CDXLVideoContext *c = avctx->priv_data;
60
61 11 c->new_video_size = 0;
62 11 c->avctx = avctx;
63
64 11 return 0;
65 }
66
67 90 static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
68 {
69
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 90 if (c->type == 1) {
70
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 4554 for (int i = 0; i < c->palette_size / 2; i++) {
71 4464 unsigned rgb = AV_RB16(&c->palette[i * 2]);
72 4464 unsigned r = ((rgb >> 8) & 0xF) * 0x11;
73 4464 unsigned g = ((rgb >> 4) & 0xF) * 0x11;
74 4464 unsigned b = (rgb & 0xF) * 0x11;
75 4464 AV_WN32(&new_palette[i], (0xFFU << 24) | (r << 16) | (g << 8) | b);
76 }
77 } else {
78 ✗ for (int i = 0; i < c->palette_size / 3; i++) {
79 ✗ unsigned rgb = AV_RB24(&c->palette[i * 3]);
80 ✗ AV_WN32(&new_palette[i], (0xFFU << 24) | rgb);
81 }
82 }
83 90 }
84
85 79 static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
86 {
87 GetBitContext gb;
88 int x, y, plane;
89
90
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 79 if (init_get_bits8(&gb, c->video, c->video_size) < 0)
91 ✗ return;
92
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 489 for (plane = 0; plane < c->bpp; plane++) {
93
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 43050 for (y = 0; y < c->avctx->height; y++) {
94
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 6629520 for (x = 0; x < c->avctx->width; x++)
95 6586880 out[linesize * y + x] |= get_bits1(&gb) << plane;
96 42640 skip_bits(&gb, c->padded_bits);
97 }
98 }
99 }
100
101 11 static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
102 {
103 GetBitContext gb;
104 int x, y, plane;
105
106
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 11 if (init_get_bits8(&gb, c->video, c->video_size) < 0)
107 ✗ return;
108
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 1441 for (y = 0; y < c->avctx->height; y++) {
109
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 10010 for (plane = 0; plane < c->bpp; plane++) {
110
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 1398540 for (x = 0; x < c->avctx->width; x++)
111 1389960 out[linesize * y + x] |= get_bits1(&gb) << plane;
112 8580 skip_bits(&gb, c->padded_bits);
113 }
114 }
115 }
116
117 ✗ static void chunky2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
118 {
119 GetByteContext gb;
120 int y;
121
122 ✗ bytestream2_init(&gb, c->video, c->video_size);
123 ✗ for (y = 0; y < c->avctx->height; y++) {
124 ✗ bytestream2_get_buffer(&gb, out + linesize * y, c->avctx->width * 3);
125 }
126 }
127
128 90 static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
129 {
130 90 memset(out, 0, linesize * c->avctx->height);
131
132
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 90 switch (c->format) {
133 79 case BIT_PLANAR:
134 79 bitplanar2chunky(c, linesize, out);
135 79 break;
136 11 case BIT_LINE:
137 11 bitline2chunky(c, linesize, out);
138 11 break;
139 ✗ case CHUNKY:
140 ✗ chunky2chunky(c, linesize, out);
141 ✗ break;
142 }
143 90 }
144
145 59 static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
146 {
147 59 uint32_t *new_palette = (uint32_t *)frame->data[1];
148
149 59 memset(frame->data[1], 0, AVPALETTE_SIZE);
150 59 import_palette(c, new_palette);
151 59 import_format(c, frame->linesize[0], frame->data[0]);
152 59 }
153
154 ✗ static void cdxl_decode_raw(CDXLVideoContext *c, AVFrame *frame)
155 {
156 ✗ import_format(c, frame->linesize[0], frame->data[0]);
157 }
158
159 28 static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
160 {
161 28 AVCodecContext *avctx = c->avctx;
162 uint32_t new_palette[16], r, g, b;
163 uint8_t *ptr, *out, index, op;
164 int x, y;
165
166 28 ptr = c->new_video;
167 28 out = frame->data[0];
168
169 28 import_palette(c, new_palette);
170 28 import_format(c, avctx->width, c->new_video);
171
172
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 3498 for (y = 0; y < avctx->height; y++) {
173 3470 r = new_palette[0] & 0xFF0000;
174 3470 g = new_palette[0] & 0xFF00;
175 3470 b = new_palette[0] & 0xFF;
176
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 561530 for (x = 0; x < avctx->width; x++) {
177 558060 index = *ptr++;
178 558060 op = index >> 4;
179 558060 index &= 15;
180
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 558060 switch (op) {
181 131279 case 0:
182 131279 r = new_palette[index] & 0xFF0000;
183 131279 g = new_palette[index] & 0xFF00;
184 131279 b = new_palette[index] & 0xFF;
185 131279 break;
186 108493 case 1:
187 108493 b = index * 0x11;
188 108493 break;
189 212370 case 2:
190 212370 r = index * 0x11 << 16;
191 212370 break;
192 105918 case 3:
193 105918 g = index * 0x11 << 8;
194 105918 break;
195 }
196 558060 AV_WL24(out + x * 3, r | g | b);
197 }
198 3470 out += frame->linesize[0];
199 }
200 28 }
201
202 3 static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
203 {
204 3 AVCodecContext *avctx = c->avctx;
205 uint32_t new_palette[64], r, g, b;
206 uint8_t *ptr, *out, index, op;
207 int x, y;
208
209 3 ptr = c->new_video;
210 3 out = frame->data[0];
211
212 3 import_palette(c, new_palette);
213 3 import_format(c, avctx->width, c->new_video);
214
215
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 387 for (y = 0; y < avctx->height; y++) {
216 384 r = new_palette[0] & 0xFF0000;
217 384 g = new_palette[0] & 0xFF00;
218 384 b = new_palette[0] & 0xFF;
219
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 67968 for (x = 0; x < avctx->width; x++) {
220 67584 index = *ptr++;
221 67584 op = index >> 6;
222 67584 index &= 63;
223
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 67584 switch (op) {
224 3417 case 0:
225 3417 r = new_palette[index] & 0xFF0000;
226 3417 g = new_palette[index] & 0xFF00;
227 3417 b = new_palette[index] & 0xFF;
228 3417 break;
229 627 case 1:
230 627 b = (index << 2) | (b & 3);
231 627 break;
232 1122 case 2:
233 1122 r = (index << 18) | (r & (3 << 16));
234 1122 break;
235 62418 case 3:
236 62418 g = (index << 10) | (g & (3 << 8));
237 62418 break;
238 }
239 67584 AV_WL24(out + x * 3, r | g | b);
240 }
241 384 out += frame->linesize[0];
242 }
243 3 }
244
245 90 static int cdxl_decode_frame(AVCodecContext *avctx, void *data,
246 int *got_frame, AVPacket *pkt)
247 {
248 90 CDXLVideoContext *c = avctx->priv_data;
249 90 AVFrame * const p = data;
250 90 int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
251 90 const uint8_t *buf = pkt->data;
252
253
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 90 if (buf_size < 32)
254 ✗ return AVERROR_INVALIDDATA;
255 90 c->type = buf[0];
256 90 encoding = buf[1] & 7;
257 90 c->format = buf[1] & 0xE0;
258 90 w = AV_RB16(&buf[14]);
259 90 h = AV_RB16(&buf[16]);
260 90 c->bpp = buf[19];
261 90 c->palette_size = AV_RB16(&buf[20]);
262 90 c->palette = buf + 32;
263 90 c->video = c->palette + c->palette_size;
264 90 c->video_size = buf_size - c->palette_size - 32;
265
266
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 90 if (c->type > 1)
267 ✗ return AVERROR_INVALIDDATA;
268
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 90 if (c->type == 1 && c->palette_size > 512)
269 ✗ return AVERROR_INVALIDDATA;
270
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 90 if (c->type == 0 && c->palette_size > 768)
271 ✗ return AVERROR_INVALIDDATA;
272
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 90 if (buf_size < c->palette_size + 32)
273 ✗ return AVERROR_INVALIDDATA;
274
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 90 if (c->bpp < 1)
275 ✗ return AVERROR_INVALIDDATA;
276
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 90 if (c->format != BIT_PLANAR && c->format != BIT_LINE && c->format != CHUNKY) {
277 ✗ avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);
278 ✗ return AVERROR_PATCHWELCOME;
279 }
280
281
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 90 if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
282 ✗ return ret;
283
284
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 90 if (c->format == CHUNKY)
285 ✗ aligned_width = avctx->width;
286 else
287 90 aligned_width = FFALIGN(c->avctx->width, 16);
288 90 c->padded_bits = aligned_width - c->avctx->width;
289
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 90 if (c->video_size < aligned_width * avctx->height * (int64_t)c->bpp / 8)
290 ✗ return AVERROR_INVALIDDATA;
291
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 90 if (!encoding && c->palette_size && c->bpp <= 8 && c->format != CHUNKY) {
292 59 avctx->pix_fmt = AV_PIX_FMT_PAL8;
293
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 31 } else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8) && c->format != CHUNKY) {
294
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 31 if (c->palette_size != (1 << (c->bpp - 1)))
295 ✗ return AVERROR_INVALIDDATA;
296 31 avctx->pix_fmt = AV_PIX_FMT_BGR24;
297 ✗ } else if (!encoding && c->bpp == 24 && c->format == CHUNKY &&
298 ✗ !c->palette_size) {
299 ✗ avctx->pix_fmt = AV_PIX_FMT_RGB24;
300 } else {
301 ✗ avpriv_request_sample(avctx, "Encoding %d, bpp %d and format 0x%x",
302 encoding, c->bpp, c->format);
303 ✗ return AVERROR_PATCHWELCOME;
304 }
305
306
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 90 if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
307 ✗ return ret;
308 90 p->pict_type = AV_PICTURE_TYPE_I;
309 90 p->key_frame = 1;
310
311
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 90 if (encoding) {
312 31 av_fast_padded_malloc(&c->new_video, &c->new_video_size,
313 31 h * w + AV_INPUT_BUFFER_PADDING_SIZE);
314
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 31 if (!c->new_video)
315 ✗ return AVERROR(ENOMEM);
316
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 31 if (c->bpp == 8)
317 3 cdxl_decode_ham8(c, p);
318 else
319 28 cdxl_decode_ham6(c, p);
320
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 59 } else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
321 59 cdxl_decode_rgb(c, p);
322 } else {
323 ✗ cdxl_decode_raw(c, p);
324 }
325 90 *got_frame = 1;
326
327 90 return buf_size;
328 }
329
330 11 static av_cold int cdxl_decode_end(AVCodecContext *avctx)
331 {
332 11 CDXLVideoContext *c = avctx->priv_data;
333
334 11 av_freep(&c->new_video);
335
336 11 return 0;
337 }
338
339 const AVCodec ff_cdxl_decoder = {
340 .name = "cdxl",
341 .long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
342 .type = AVMEDIA_TYPE_VIDEO,
343 .id = AV_CODEC_ID_CDXL,
344 .priv_data_size = sizeof(CDXLVideoContext),
345 .init = cdxl_decode_init,
346 .close = cdxl_decode_end,
347 .decode = cdxl_decode_frame,
348 .capabilities = AV_CODEC_CAP_DR1,
349 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
350 };
351