FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/cdxl.c
Date: 2022-07-07 01:21:54
Exec Total Coverage
Lines: 157 191 82.2%
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 "codec_internal.h"
35 #include "get_bits.h"
36 #include "internal.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 90 static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
69 {
70
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90 if (c->type == 1) {
71
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4554 for (int i = 0; i < c->palette_size / 2; i++) {
72 4464 unsigned rgb = AV_RB16(&c->palette[i * 2]);
73 4464 unsigned r = ((rgb >> 8) & 0xF) * 0x11;
74 4464 unsigned g = ((rgb >> 4) & 0xF) * 0x11;
75 4464 unsigned b = (rgb & 0xF) * 0x11;
76 4464 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 90 }
85
86 79 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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79 if (init_get_bits8(&gb, c->video, c->video_size) < 0)
92 return;
93
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489 for (plane = 0; plane < c->bpp; plane++) {
94
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43050 for (y = 0; y < c->avctx->height; y++) {
95
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6629520 for (x = 0; x < c->avctx->width; x++)
96 6586880 out[linesize * y + x] |= get_bits1(&gb) << plane;
97 42640 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 90 static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
130 {
131 90 memset(out, 0, linesize * c->avctx->height);
132
133
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90 switch (c->format) {
134 79 case BIT_PLANAR:
135 79 bitplanar2chunky(c, linesize, out);
136 79 break;
137 11 case BIT_LINE:
138 11 bitline2chunky(c, linesize, out);
139 11 break;
140 case CHUNKY:
141 chunky2chunky(c, linesize, out);
142 break;
143 }
144 90 }
145
146 59 static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
147 {
148 59 uint32_t *new_palette = (uint32_t *)frame->data[1];
149
150 59 memset(frame->data[1], 0, AVPALETTE_SIZE);
151 59 import_palette(c, new_palette);
152 59 import_format(c, frame->linesize[0], frame->data[0]);
153 59 }
154
155 static void cdxl_decode_raw(CDXLVideoContext *c, AVFrame *frame)
156 {
157 import_format(c, frame->linesize[0], frame->data[0]);
158 }
159
160 28 static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
161 {
162 28 AVCodecContext *avctx = c->avctx;
163 uint32_t new_palette[16], r, g, b;
164 uint8_t *ptr, *out, index, op;
165 int x, y;
166
167 28 ptr = c->new_video;
168 28 out = frame->data[0];
169
170 28 import_palette(c, new_palette);
171 28 import_format(c, avctx->width, c->new_video);
172
173
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3498 for (y = 0; y < avctx->height; y++) {
174 3470 r = new_palette[0] & 0xFF0000;
175 3470 g = new_palette[0] & 0xFF00;
176 3470 b = new_palette[0] & 0xFF;
177
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561530 for (x = 0; x < avctx->width; x++) {
178 558060 index = *ptr++;
179 558060 op = index >> 4;
180 558060 index &= 15;
181
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558060 switch (op) {
182 131279 case 0:
183 131279 r = new_palette[index] & 0xFF0000;
184 131279 g = new_palette[index] & 0xFF00;
185 131279 b = new_palette[index] & 0xFF;
186 131279 break;
187 108493 case 1:
188 108493 b = index * 0x11;
189 108493 break;
190 212370 case 2:
191 212370 r = index * 0x11 << 16;
192 212370 break;
193 105918 case 3:
194 105918 g = index * 0x11 << 8;
195 105918 break;
196 }
197 558060 AV_WL24(out + x * 3, r | g | b);
198 }
199 3470 out += frame->linesize[0];
200 }
201 28 }
202
203 3 static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
204 {
205 3 AVCodecContext *avctx = c->avctx;
206 uint32_t new_palette[64], r, g, b;
207 uint8_t *ptr, *out, index, op;
208 int x, y;
209
210 3 ptr = c->new_video;
211 3 out = frame->data[0];
212
213 3 import_palette(c, new_palette);
214 3 import_format(c, avctx->width, c->new_video);
215
216
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387 for (y = 0; y < avctx->height; y++) {
217 384 r = new_palette[0] & 0xFF0000;
218 384 g = new_palette[0] & 0xFF00;
219 384 b = new_palette[0] & 0xFF;
220
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67968 for (x = 0; x < avctx->width; x++) {
221 67584 index = *ptr++;
222 67584 op = index >> 6;
223 67584 index &= 63;
224
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67584 switch (op) {
225 3417 case 0:
226 3417 r = new_palette[index] & 0xFF0000;
227 3417 g = new_palette[index] & 0xFF00;
228 3417 b = new_palette[index] & 0xFF;
229 3417 break;
230 627 case 1:
231 627 b = (index << 2) | (b & 3);
232 627 break;
233 1122 case 2:
234 1122 r = (index << 18) | (r & (3 << 16));
235 1122 break;
236 62418 case 3:
237 62418 g = (index << 10) | (g & (3 << 8));
238 62418 break;
239 }
240 67584 AV_WL24(out + x * 3, r | g | b);
241 }
242 384 out += frame->linesize[0];
243 }
244 3 }
245
246 90 static int cdxl_decode_frame(AVCodecContext *avctx, AVFrame *p,
247 int *got_frame, AVPacket *pkt)
248 {
249 90 CDXLVideoContext *c = avctx->priv_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 FFCodec ff_cdxl_decoder = {
340 .p.name = "cdxl",
341 .p.long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
342 .p.type = AVMEDIA_TYPE_VIDEO,
343 .p.id = AV_CODEC_ID_CDXL,
344 .priv_data_size = sizeof(CDXLVideoContext),
345 .init = cdxl_decode_init,
346 .close = cdxl_decode_end,
347 FF_CODEC_DECODE_CB(cdxl_decode_frame),
348 .p.capabilities = AV_CODEC_CAP_DR1,
349 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
350 };
351