FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/qpeg.c
Date: 2021-09-16 08:47:15
Exec Total Coverage
Lines: 164 190 86.3%
Branches: 92 120 76.7%

Line Branch Exec Source
1 /*
2 * QPEG codec
3 * Copyright (c) 2004 Konstantin Shishkov
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 * QPEG codec.
25 */
26
27 #include "avcodec.h"
28 #include "bytestream.h"
29 #include "decode.h"
30 #include "internal.h"
31
32 typedef struct QpegContext{
33 AVCodecContext *avctx;
34 AVFrame *ref;
35 uint32_t pal[256];
36 GetByteContext buffer;
37 } QpegContext;
38
39 1 static void qpeg_decode_intra(QpegContext *qctx, uint8_t *dst,
40 int stride, int width, int height)
41 {
42 int i;
43 int code;
44 int c0, c1;
45 int run, copy;
46 1 int filled = 0;
47 int rows_to_go;
48
49 1 rows_to_go = height;
50 1 height--;
51 1 dst = dst + height * stride;
52
53
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10407 while ((bytestream2_get_bytes_left(&qctx->buffer) > 0) && (rows_to_go > 0)) {
54 10406 code = bytestream2_get_byte(&qctx->buffer);
55 10406 run = copy = 0;
56
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10406 if(code == 0xFC) /* end-of-picture code */
57 break;
58
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10406 if(code >= 0xF8) { /* very long run */
59 c0 = bytestream2_get_byte(&qctx->buffer);
60 c1 = bytestream2_get_byte(&qctx->buffer);
61 run = ((code & 0x7) << 16) + (c0 << 8) + c1 + 2;
62
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10406 } else if (code >= 0xF0) { /* long run */
63 21 c0 = bytestream2_get_byte(&qctx->buffer);
64 21 run = ((code & 0xF) << 8) + c0 + 2;
65
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10385 } else if (code >= 0xE0) { /* short run */
66 5687 run = (code & 0x1F) + 2;
67
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4698 } else if (code >= 0xC0) { /* very long copy */
68 c0 = bytestream2_get_byte(&qctx->buffer);
69 c1 = bytestream2_get_byte(&qctx->buffer);
70 copy = ((code & 0x3F) << 16) + (c0 << 8) + c1 + 1;
71
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4698 } else if (code >= 0x80) { /* long copy */
72 c0 = bytestream2_get_byte(&qctx->buffer);
73 copy = ((code & 0x7F) << 8) + c0 + 1;
74 } else { /* short copy */
75 4698 copy = code + 1;
76 }
77
78 /* perform actual run or copy */
79
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10406 if(run) {
80 int p;
81
82 5708 p = bytestream2_get_byte(&qctx->buffer);
83
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11416 for(i = 0; i < run; i++) {
84 5708 int step = FFMIN(run - i, width - filled);
85 5708 memset(dst+filled, p, step);
86 5708 filled += step;
87 5708 i += step - 1;
88
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5708 if (filled >= width) {
89 30 filled = 0;
90 30 dst -= stride;
91 30 rows_to_go--;
92
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30 while (run - i > width && rows_to_go > 0) {
93 memset(dst, p, width);
94 dst -= stride;
95 rows_to_go--;
96 i += width;
97 }
98
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30 if(rows_to_go <= 0)
99 break;
100 }
101 }
102 } else {
103
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4698 if (bytestream2_get_bytes_left(&qctx->buffer) < copy)
104 copy = bytestream2_get_bytes_left(&qctx->buffer);
105
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9588 while (copy > 0) {
106 4891 int step = FFMIN(copy, width - filled);
107 4891 bytestream2_get_bufferu(&qctx->buffer, dst + filled, step);
108 4891 filled += step;
109 4891 copy -= step;
110
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4891 if (filled >= width) {
111 210 filled = 0;
112 210 dst -= stride;
113 210 rows_to_go--;
114
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210 if(rows_to_go <= 0)
115 1 break;
116 }
117 }
118 }
119 }
120 1 }
121
122 static const uint8_t qpeg_table_h[16] =
123 { 0x00, 0x20, 0x20, 0x20, 0x18, 0x10, 0x10, 0x20, 0x10, 0x08, 0x18, 0x08, 0x08, 0x18, 0x10, 0x04};
124 static const uint8_t qpeg_table_w[16] =
125 { 0x00, 0x20, 0x18, 0x08, 0x18, 0x10, 0x20, 0x10, 0x08, 0x10, 0x20, 0x20, 0x08, 0x10, 0x18, 0x04};
126
127 /* Decodes delta frames */
128 99 static void av_noinline qpeg_decode_inter(QpegContext *qctx, uint8_t *dst,
129 int stride, int width, int height,
130 int delta, const uint8_t *ctable,
131 uint8_t *refdata)
132 {
133 int i, j;
134 int code;
135 99 int filled = 0;
136 int orig_height;
137
138
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99 if (refdata) {
139 /* copy prev frame */
140
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23859 for (i = 0; i < height; i++)
141 23760 memcpy(dst + (i * stride), refdata + (i * stride), width);
142 } else {
143 refdata = dst;
144 }
145
146 99 orig_height = height;
147 99 height--;
148 99 dst = dst + height * stride;
149
150
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731786 while ((bytestream2_get_bytes_left(&qctx->buffer) > 0) && (height >= 0)) {
151 731779 code = bytestream2_get_byte(&qctx->buffer);
152
153
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731779 if(delta) {
154 /* motion compensation */
155
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751186 while(bytestream2_get_bytes_left(&qctx->buffer) > 0 && (code & 0xF0) == 0xF0) {
156
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19407 if(delta == 1) {
157 int me_idx;
158 int me_w, me_h, me_x, me_y;
159 uint8_t *me_plane;
160 int corr, val;
161
162 /* get block size by index */
163 19407 me_idx = code & 0xF;
164 19407 me_w = qpeg_table_w[me_idx];
165 19407 me_h = qpeg_table_h[me_idx];
166
167 /* extract motion vector */
168 19407 corr = bytestream2_get_byte(&qctx->buffer);
169
170 19407 val = corr >> 4;
171
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19407 if(val > 7)
172 8637 val -= 16;
173 19407 me_x = val;
174
175 19407 val = corr & 0xF;
176
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19407 if(val > 7)
177 9623 val -= 16;
178 19407 me_y = val;
179
180 /* check motion vector */
181
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19407 if ((me_x + filled < 0) || (me_x + me_w + filled > width) ||
182
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19407 (height - me_y - me_h < 0) || (height - me_y >= orig_height) ||
183
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19407 (filled + me_w > width) || (height - me_h < 0))
184 av_log(qctx->avctx, AV_LOG_ERROR, "Bogus motion vector (%i,%i), block size %ix%i at %i,%i\n",
185 me_x, me_y, me_w, me_h, filled, height);
186 else {
187 /* do motion compensation */
188 19407 me_plane = refdata + (filled + me_x) + (height - me_y) * stride;
189
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177719 for(j = 0; j < me_h; j++) {
190
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1454952 for(i = 0; i < me_w; i++)
191 1296640 dst[filled + i - (j * stride)] = me_plane[i - (j * stride)];
192 }
193 }
194 }
195 19407 code = bytestream2_get_byte(&qctx->buffer);
196 }
197 }
198
199
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731779 if(code == 0xE0) /* end-of-picture code */
200 92 break;
201
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731687 if(code > 0xE0) { /* run code: 0xE1..0xFF */
202 int p;
203
204 96361 code &= 0x1F;
205 96361 p = bytestream2_get_byte(&qctx->buffer);
206
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359528 for(i = 0; i <= code; i++) {
207 263167 dst[filled++] = p;
208
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263167 if(filled >= width) {
209 72 filled = 0;
210 72 dst -= stride;
211 72 height--;
212
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72 if (height < 0)
213 break;
214 }
215 }
216
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635326 } else if(code >= 0xC0) { /* copy code: 0xC0..0xDF */
217 214471 code &= 0x1F;
218
219
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214471 if(code + 1 > bytestream2_get_bytes_left(&qctx->buffer))
220 break;
221
222
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957914 for(i = 0; i <= code; i++) {
223 743443 dst[filled++] = bytestream2_get_byte(&qctx->buffer);
224
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743443 if(filled >= width) {
225 16 filled = 0;
226 16 dst -= stride;
227 16 height--;
228
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16 if (height < 0)
229 break;
230 }
231 }
232
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420855 } else if(code >= 0x80) { /* skip code: 0x80..0xBF */
233 int skip;
234
235 249130 code &= 0x3F;
236 /* codes 0x80 and 0x81 are actually escape codes,
237 skip value minus constant is in the next byte */
238
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249130 if(!code)
239 29191 skip = bytestream2_get_byte(&qctx->buffer) + 64;
240
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219939 else if(code == 1)
241 273 skip = bytestream2_get_byte(&qctx->buffer) + 320;
242 else
243 219666 skip = code;
244 249130 filled += skip;
245
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272528 while( filled >= width) {
246 23398 filled -= width;
247 23398 dst -= stride;
248 23398 height--;
249
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23398 if(height < 0)
250 break;
251 }
252 } else {
253 /* zero code treated as one-pixel skip */
254
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171725 if(code) {
255 124870 dst[filled++] = ctable[code & 0x7F];
256 }
257 else
258 46855 filled++;
259
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171725 if(filled >= width) {
260 182 filled = 0;
261 182 dst -= stride;
262 182 height--;
263 }
264 }
265 }
266 99 }
267
268 100 static int decode_frame(AVCodecContext *avctx,
269 void *data, int *got_frame,
270 AVPacket *avpkt)
271 {
272 uint8_t ctable[128];
273 100 QpegContext * const a = avctx->priv_data;
274 100 AVFrame * const p = data;
275 100 AVFrame * const ref = a->ref;
276 uint8_t* outdata;
277 int delta, intra, ret;
278
279
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100 if (avpkt->size < 0x86) {
280 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
281 return AVERROR_INVALIDDATA;
282 }
283
284 100 bytestream2_init(&a->buffer, avpkt->data, avpkt->size);
285
286
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100 if ((ret = ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF)) < 0)
287 return ret;
288 100 outdata = p->data[0];
289 100 bytestream2_skip(&a->buffer, 4);
290 100 bytestream2_get_buffer(&a->buffer, ctable, 128);
291 100 bytestream2_skip(&a->buffer, 1);
292
293 100 delta = bytestream2_get_byte(&a->buffer);
294 100 intra = delta == 0x10;
295
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100 if (intra) {
296 1 qpeg_decode_intra(a, outdata, p->linesize[0], avctx->width, avctx->height);
297 } else {
298 99 qpeg_decode_inter(a, outdata, p->linesize[0], avctx->width, avctx->height, delta, ctable, ref->data[0]);
299 }
300
301 /* make the palette available on the way out */
302 100 p->palette_has_changed = ff_copy_palette(a->pal, avpkt, avctx);
303 100 memcpy(p->data[1], a->pal, AVPALETTE_SIZE);
304
305 100 av_frame_unref(ref);
306
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100 if ((ret = av_frame_ref(ref, p)) < 0)
307 return ret;
308
309 100 p->key_frame = intra;
310
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100 p->pict_type = intra ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
311
312 100 *got_frame = 1;
313
314 100 return avpkt->size;
315 }
316
317 2 static void decode_flush(AVCodecContext *avctx){
318 2 QpegContext * const a = avctx->priv_data;
319 int i, pal_size;
320 const uint8_t *pal_src;
321
322 2 av_frame_unref(a->ref);
323
324 2 pal_size = FFMIN(1024U, avctx->extradata_size);
325 2 pal_src = avctx->extradata + avctx->extradata_size - pal_size;
326
327
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514 for (i=0; i<pal_size/4; i++)
328 512 a->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
329 2 }
330
331 2 static av_cold int decode_end(AVCodecContext *avctx)
332 {
333 2 QpegContext * const a = avctx->priv_data;
334
335 2 av_frame_free(&a->ref);
336
337 2 return 0;
338 }
339
340 2 static av_cold int decode_init(AVCodecContext *avctx){
341 2 QpegContext * const a = avctx->priv_data;
342
343 2 a->avctx = avctx;
344 2 avctx->pix_fmt= AV_PIX_FMT_PAL8;
345
346 2 a->ref = av_frame_alloc();
347
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2 if (!a->ref)
348 return AVERROR(ENOMEM);
349
350 2 decode_flush(avctx);
351
352 2 return 0;
353 }
354
355 const AVCodec ff_qpeg_decoder = {
356 .name = "qpeg",
357 .long_name = NULL_IF_CONFIG_SMALL("Q-team QPEG"),
358 .type = AVMEDIA_TYPE_VIDEO,
359 .id = AV_CODEC_ID_QPEG,
360 .priv_data_size = sizeof(QpegContext),
361 .init = decode_init,
362 .close = decode_end,
363 .decode = decode_frame,
364 .flush = decode_flush,
365 .capabilities = AV_CODEC_CAP_DR1,
366 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
367 FF_CODEC_CAP_INIT_CLEANUP,
368 };
369