FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/fraps.c
Date: 2023-10-02 11:06:47
Exec Total Coverage
Lines: 124 153 81.0%
Functions: 5 5 100.0%
Branches: 72 98 73.5%
Line Branch Exec Source
1 /*
2 * Fraps FPS1 decoder
3 * Copyright (c) 2005 Roine Gustafsson
4 * Copyright (c) 2006 Konstantin Shishkov
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * Lossless Fraps 'FPS1' decoder
26 * @author Roine Gustafsson (roine at users sf net)
27 * @author Konstantin Shishkov
28 *
29 * Codec algorithm for version 0 is taken from Transcode <www.transcoding.org>
30 *
31 * Version 2 files support by Konstantin Shishkov
32 */
33
34 #include "config.h"
35
36 #define CACHED_BITSTREAM_READER HAVE_FAST_64BIT
37 #define UNCHECKED_BITSTREAM_READER 1
38 #include "avcodec.h"
39 #include "get_bits.h"
40 #include "huffman.h"
41 #include "bytestream.h"
42 #include "bswapdsp.h"
43 #include "codec_internal.h"
44 #include "thread.h"
45
46 #define FPS_TAG MKTAG('F', 'P', 'S', 'x')
47 #define VLC_BITS 11
48
49 /**
50 * local variable storage
51 */
52 typedef struct FrapsContext {
53 AVCodecContext *avctx;
54 BswapDSPContext bdsp;
55 uint8_t *tmpbuf;
56 int tmpbuf_size;
57 } FrapsContext;
58
59 /**
60 * initializes decoder
61 * @param avctx codec context
62 * @return 0 on success or negative if fails
63 */
64 14 static av_cold int decode_init(AVCodecContext *avctx)
65 {
66 14 FrapsContext * const s = avctx->priv_data;
67
68 14 s->avctx = avctx;
69 14 s->tmpbuf = NULL;
70
71 14 ff_bswapdsp_init(&s->bdsp);
72
73 14 return 0;
74 }
75
76 /**
77 * Comparator - our nodes should ascend by count
78 * but with preserved symbol order
79 */
80 924225 static int huff_cmp(const void *va, const void *vb)
81 {
82 924225 const Node *a = va, *b = vb;
83 924225 return (a->count - b->count)*256 + a->sym - b->sym;
84 }
85
86 /**
87 * decode Fraps v2 packed plane
88 */
89 417 static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
90 int h, const uint8_t *src, int size, int Uoff,
91 const int step)
92 {
93 int i, j, ret;
94 GetBitContext gb;
95 VLC vlc;
96 Node nodes[512];
97
98
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 107169 for (i = 0; i < 256; i++)
99 106752 nodes[i].count = bytestream_get_le32(&src);
100 417 size -= 1024;
101
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 417 if ((ret = ff_huff_build_tree(s->avctx, &vlc, 256, VLC_BITS,
102 nodes, huff_cmp,
103 FF_HUFFMAN_FLAG_ZERO_COUNT)) < 0)
104 ✗ return ret;
105 /* we have built Huffman table and are ready to decode plane */
106
107 /* convert bits so they may be used by standard bitreader */
108 417 s->bdsp.bswap_buf((uint32_t *) s->tmpbuf,
109 (const uint32_t *) src, size >> 2);
110
111
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 417 if ((ret = init_get_bits8(&gb, s->tmpbuf, size)) < 0)
112 ✗ return ret;
113
114
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 82607 for (j = 0; j < h; j++) {
115
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 29602124 for (i = 0; i < w*step; i += step) {
116 29519934 dst[i] = get_vlc2(&gb, vlc.table, VLC_BITS, 3);
117 /* lines are stored as deltas between previous lines
118 * and we need to add 0x80 to the first lines of chroma planes
119 */
120
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121 29387582 dst[i] += dst[i - stride];
122
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 132352 else if (Uoff)
123 8192 dst[i] += 0x80;
124
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 29519934 if (get_bits_left(&gb) < 0) {
125 2 ff_vlc_free(&vlc);
126 2 return AVERROR_INVALIDDATA;
127 }
128 }
129 82190 dst += stride;
130 }
131 415 ff_vlc_free(&vlc);
132 415 return 0;
133 }
134
135 176 static int decode_frame(AVCodecContext *avctx, AVFrame *f,
136 int *got_frame, AVPacket *avpkt)
137 {
138 176 FrapsContext * const s = avctx->priv_data;
139 176 const uint8_t *buf = avpkt->data;
140 176 int buf_size = avpkt->size;
141 uint32_t header;
142 unsigned int version,header_size;
143 const uint32_t *buf32;
144 uint32_t *luma1,*luma2,*cb,*cr;
145 uint32_t offs[4];
146 int i, j, ret, is_chroma;
147 176 const int planes = 3;
148 int is_pal;
149 uint8_t *out;
150
151
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 176 if (buf_size < 4) {
152 ✗ av_log(avctx, AV_LOG_ERROR, "Packet is too short\n");
153 ✗ return AVERROR_INVALIDDATA;
154 }
155
156 176 header = AV_RL32(buf);
157 176 version = header & 0xff;
158
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 176 is_pal = buf[1] == 2 && version == 1;
159
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 176 header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */
160
161
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 176 if (version > 5) {
162 ✗ avpriv_report_missing_feature(avctx, "Fraps version %u", version);
163 ✗ return AVERROR_PATCHWELCOME;
164 }
165
166 176 buf += header_size;
167
168
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 176 if (is_pal) {
169 ✗ unsigned needed_size = avctx->width * avctx->height + 1024;
170 ✗ needed_size += header_size;
171 ✗ if (buf_size != needed_size) {
172 ✗ av_log(avctx, AV_LOG_ERROR,
173 "Invalid frame length %d (should be %d)\n",
174 buf_size, needed_size);
175 ✗ return AVERROR_INVALIDDATA;
176 }
177
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 176 } else if (version < 2) {
178 24 unsigned needed_size = avctx->width * avctx->height * 3;
179
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 24 if (version == 0) needed_size /= 2;
180 24 needed_size += header_size;
181 /* bit 31 means same as previous pic */
182
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 24 if (header & (1U<<31)) {
183 ✗ *got_frame = 0;
184 ✗ return buf_size;
185 }
186
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 24 if (buf_size != needed_size) {
187 1 av_log(avctx, AV_LOG_ERROR,
188 "Invalid frame length %d (should be %d)\n",
189 buf_size, needed_size);
190 1 return AVERROR_INVALIDDATA;
191 }
192 } else {
193 /* skip frame */
194
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 152 if (buf_size == 8) {
195 10 *got_frame = 0;
196 10 return buf_size;
197 }
198
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 142 if (AV_RL32(buf) != FPS_TAG || buf_size < planes*1024 + 24) {
199 ✗ av_log(avctx, AV_LOG_ERROR, "error in data stream\n");
200 ✗ return AVERROR_INVALIDDATA;
201 }
202
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 563 for (i = 0; i < planes; i++) {
203 424 offs[i] = AV_RL32(buf + 4 + i * 4);
204
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 424 if (offs[i] >= buf_size - header_size || (i && offs[i] <= offs[i - 1] + 1024)) {
205 3 av_log(avctx, AV_LOG_ERROR, "plane %i offset is out of bounds\n", i);
206 3 return AVERROR_INVALIDDATA;
207 }
208 }
209 139 offs[planes] = buf_size - header_size;
210
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 556 for (i = 0; i < planes; i++) {
211 417 av_fast_padded_malloc(&s->tmpbuf, &s->tmpbuf_size, offs[i + 1] - offs[i] - 1024);
212
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 417 if (!s->tmpbuf)
213 ✗ return AVERROR(ENOMEM);
214 }
215 }
216
217 162 f->pict_type = AV_PICTURE_TYPE_I;
218 162 f->flags |= AV_FRAME_FLAG_KEY;
219
220
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 162 avctx->pix_fmt = version & 1 ? is_pal ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_BGR24 : AV_PIX_FMT_YUVJ420P;
221 324 avctx->color_range = version & 1 ? AVCOL_RANGE_UNSPECIFIED
222
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 162 : AVCOL_RANGE_JPEG;
223
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 162 avctx->colorspace = version & 1 ? AVCOL_SPC_UNSPECIFIED : AVCOL_SPC_BT709;
224
225
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 162 if ((ret = ff_thread_get_buffer(avctx, f, 0)) < 0)
226 ✗ return ret;
227
228
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 162 switch (version) {
229 21 case 0:
230 default:
231 /* Fraps v0 is a reordered YUV420 */
232
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 21 if (((avctx->width % 8) != 0) || ((avctx->height % 2) != 0)) {
233 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
234 avctx->width, avctx->height);
235 ✗ return AVERROR_INVALIDDATA;
236 }
237
238 21 buf32 = (const uint32_t*)buf;
239
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 2289 for (ptrdiff_t y = 0; y < avctx->height / 2; y++) {
240 2268 luma1 = (uint32_t*)&f->data[0][ y * 2 * f->linesize[0] ];
241 2268 luma2 = (uint32_t*)&f->data[0][ (y * 2 + 1) * f->linesize[0] ];
242 2268 cr = (uint32_t*)&f->data[1][ y * f->linesize[1] ];
243 2268 cb = (uint32_t*)&f->data[2][ y * f->linesize[2] ];
244
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 90720 for (ptrdiff_t x = 0; x < avctx->width; x += 8) {
245 88452 *luma1++ = *buf32++;
246 88452 *luma1++ = *buf32++;
247 88452 *luma2++ = *buf32++;
248 88452 *luma2++ = *buf32++;
249 88452 *cr++ = *buf32++;
250 88452 *cb++ = *buf32++;
251 }
252 }
253 21 break;
254
255 2 case 1:
256
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 2 if (is_pal) {
257 ✗ uint32_t *pal = (uint32_t *)f->data[1];
258
259 ✗ for (unsigned y = 0; y < 256; y++) {
260 ✗ pal[y] = AV_RL32(buf) | 0xFF000000;
261 ✗ buf += 4;
262 }
263
264 ✗ for (ptrdiff_t y = 0; y < avctx->height; y++)
265 ✗ memcpy(&f->data[0][y * f->linesize[0]],
266 ✗ &buf[y * avctx->width],
267 ✗ avctx->width);
268 } else {
269 /* Fraps v1 is an upside-down BGR24 */
270
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 482 for (ptrdiff_t y = 0; y < avctx->height; y++)
271 480 memcpy(&f->data[0][(avctx->height - y - 1) * f->linesize[0]],
272 480 &buf[y * avctx->width * 3],
273 480 3 * avctx->width);
274 }
275 2 break;
276
277 11 case 2:
278 case 4:
279 /**
280 * Fraps v2 is Huffman-coded YUV420 planes
281 * Fraps v4 is virtually the same
282 */
283
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 44 for (i = 0; i < planes; i++) {
284 33 is_chroma = !!i;
285
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 33 if ((ret = fraps2_decode_plane(s, f->data[i], f->linesize[i],
286 33 avctx->width >> is_chroma,
287 33 avctx->height >> is_chroma,
288 33 buf + offs[i], offs[i + 1] - offs[i],
289 is_chroma, 1)) < 0) {
290 ✗ av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
291 ✗ return ret;
292 }
293 }
294 11 break;
295 128 case 3:
296 case 5:
297 /* Virtually the same as version 4, but is for RGB24 */
298
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 510 for (i = 0; i < planes; i++) {
299
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 384 if ((ret = fraps2_decode_plane(s, f->data[0] + i + (f->linesize[0] * (avctx->height - 1)),
300 384 -f->linesize[0], avctx->width, avctx->height,
301 384 buf + offs[i], offs[i + 1] - offs[i], 0, 3)) < 0) {
302 2 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
303 2 return ret;
304 }
305 }
306 126 out = f->data[0];
307 // convert pseudo-YUV into real RGB
308
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 23022 for (j = 0; j < avctx->height; j++) {
309 22896 uint8_t *line_end = out + 3*avctx->width;
310
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 7305072 while (out < line_end) {
311 7282176 out[0] += out[1];
312 7282176 out[2] += out[1];
313 7282176 out += 3;
314 }
315 22896 out += f->linesize[0] - 3*avctx->width;
316 }
317 126 break;
318 }
319
320 160 *got_frame = 1;
321
322 160 return buf_size;
323 }
324
325 /**
326 * closes decoder
327 * @param avctx codec context
328 * @return 0 on success or negative if fails
329 */
330 14 static av_cold int decode_end(AVCodecContext *avctx)
331 {
332 14 FrapsContext *s = avctx->priv_data;
333
334 14 av_freep(&s->tmpbuf);
335 14 return 0;
336 }
337
338 const FFCodec ff_fraps_decoder = {
339 .p.name = "fraps",
340 CODEC_LONG_NAME("Fraps"),
341 .p.type = AVMEDIA_TYPE_VIDEO,
342 .p.id = AV_CODEC_ID_FRAPS,
343 .priv_data_size = sizeof(FrapsContext),
344 .init = decode_init,
345 .close = decode_end,
346 FF_CODEC_DECODE_CB(decode_frame),
347 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
348 };
349