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path: root/libavcodec/fraps.c (plain)
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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 "avcodec.h"
35#include "get_bits.h"
36#include "huffman.h"
37#include "bytestream.h"
38#include "bswapdsp.h"
39#include "internal.h"
40#include "thread.h"
41
42#define FPS_TAG MKTAG('F', 'P', 'S', 'x')
43#define VLC_BITS 11
44
45/**
46 * local variable storage
47 */
48typedef struct FrapsContext {
49 AVCodecContext *avctx;
50 BswapDSPContext bdsp;
51 uint8_t *tmpbuf;
52 int tmpbuf_size;
53} FrapsContext;
54
55
56/**
57 * initializes decoder
58 * @param avctx codec context
59 * @return 0 on success or negative if fails
60 */
61static av_cold int decode_init(AVCodecContext *avctx)
62{
63 FrapsContext * const s = avctx->priv_data;
64
65 s->avctx = avctx;
66 s->tmpbuf = NULL;
67
68 ff_bswapdsp_init(&s->bdsp);
69
70 return 0;
71}
72
73/**
74 * Comparator - our nodes should ascend by count
75 * but with preserved symbol order
76 */
77static int huff_cmp(const void *va, const void *vb)
78{
79 const Node *a = va, *b = vb;
80 return (a->count - b->count)*256 + a->sym - b->sym;
81}
82
83/**
84 * decode Fraps v2 packed plane
85 */
86static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
87 int h, const uint8_t *src, int size, int Uoff,
88 const int step)
89{
90 int i, j, ret;
91 GetBitContext gb;
92 VLC vlc;
93 Node nodes[512];
94
95 for (i = 0; i < 256; i++)
96 nodes[i].count = bytestream_get_le32(&src);
97 size -= 1024;
98 if ((ret = ff_huff_build_tree(s->avctx, &vlc, 256, VLC_BITS,
99 nodes, huff_cmp,
100 FF_HUFFMAN_FLAG_ZERO_COUNT)) < 0)
101 return ret;
102 /* we have built Huffman table and are ready to decode plane */
103
104 /* convert bits so they may be used by standard bitreader */
105 s->bdsp.bswap_buf((uint32_t *) s->tmpbuf,
106 (const uint32_t *) src, size >> 2);
107
108 if ((ret = init_get_bits8(&gb, s->tmpbuf, size)) < 0)
109 return ret;
110
111 for (j = 0; j < h; j++) {
112 for (i = 0; i < w*step; i += step) {
113 dst[i] = get_vlc2(&gb, vlc.table, VLC_BITS, 3);
114 /* lines are stored as deltas between previous lines
115 * and we need to add 0x80 to the first lines of chroma planes
116 */
117 if (j)
118 dst[i] += dst[i - stride];
119 else if (Uoff)
120 dst[i] += 0x80;
121 if (get_bits_left(&gb) < 0) {
122 ff_free_vlc(&vlc);
123 return AVERROR_INVALIDDATA;
124 }
125 }
126 dst += stride;
127 }
128 ff_free_vlc(&vlc);
129 return 0;
130}
131
132static int decode_frame(AVCodecContext *avctx,
133 void *data, int *got_frame,
134 AVPacket *avpkt)
135{
136 FrapsContext * const s = avctx->priv_data;
137 const uint8_t *buf = avpkt->data;
138 int buf_size = avpkt->size;
139 ThreadFrame frame = { .f = data };
140 AVFrame * const f = data;
141 uint32_t header;
142 unsigned int version,header_size;
143 unsigned int x, y;
144 const uint32_t *buf32;
145 uint32_t *luma1,*luma2,*cb,*cr;
146 uint32_t offs[4];
147 int i, j, ret, is_chroma;
148 const int planes = 3;
149 int is_pal;
150 uint8_t *out;
151
152 if (buf_size < 4) {
153 av_log(avctx, AV_LOG_ERROR, "Packet is too short\n");
154 return AVERROR_INVALIDDATA;
155 }
156
157 header = AV_RL32(buf);
158 version = header & 0xff;
159 is_pal = buf[1] == 2 && version == 1;
160 header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */
161
162 if (version > 5) {
163 avpriv_report_missing_feature(avctx, "Fraps version %u", version);
164 return AVERROR_PATCHWELCOME;
165 }
166
167 buf += header_size;
168
169 if (is_pal) {
170 unsigned needed_size = avctx->width * avctx->height + 1024;
171 needed_size += header_size;
172 if (buf_size != needed_size) {
173 av_log(avctx, AV_LOG_ERROR,
174 "Invalid frame length %d (should be %d)\n",
175 buf_size, needed_size);
176 return AVERROR_INVALIDDATA;
177 }
178 } else if (version < 2) {
179 unsigned needed_size = avctx->width * avctx->height * 3;
180 if (version == 0) needed_size /= 2;
181 needed_size += header_size;
182 /* bit 31 means same as previous pic */
183 if (header & (1U<<31)) {
184 *got_frame = 0;
185 return buf_size;
186 }
187 if (buf_size != needed_size) {
188 av_log(avctx, AV_LOG_ERROR,
189 "Invalid frame length %d (should be %d)\n",
190 buf_size, needed_size);
191 return AVERROR_INVALIDDATA;
192 }
193 } else {
194 /* skip frame */
195 if (buf_size == 8) {
196 *got_frame = 0;
197 return buf_size;
198 }
199 if (AV_RL32(buf) != FPS_TAG || buf_size < planes*1024 + 24) {
200 av_log(avctx, AV_LOG_ERROR, "error in data stream\n");
201 return AVERROR_INVALIDDATA;
202 }
203 for (i = 0; i < planes; i++) {
204 offs[i] = AV_RL32(buf + 4 + i * 4);
205 if (offs[i] >= buf_size - header_size || (i && offs[i] <= offs[i - 1] + 1024)) {
206 av_log(avctx, AV_LOG_ERROR, "plane %i offset is out of bounds\n", i);
207 return AVERROR_INVALIDDATA;
208 }
209 }
210 offs[planes] = buf_size - header_size;
211 for (i = 0; i < planes; i++) {
212 av_fast_padded_malloc(&s->tmpbuf, &s->tmpbuf_size, offs[i + 1] - offs[i] - 1024);
213 if (!s->tmpbuf)
214 return AVERROR(ENOMEM);
215 }
216 }
217
218 f->pict_type = AV_PICTURE_TYPE_I;
219 f->key_frame = 1;
220
221 avctx->pix_fmt = version & 1 ? is_pal ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_BGR24 : AV_PIX_FMT_YUVJ420P;
222 avctx->color_range = version & 1 ? AVCOL_RANGE_UNSPECIFIED
223 : AVCOL_RANGE_JPEG;
224 avctx->colorspace = version & 1 ? AVCOL_SPC_UNSPECIFIED : AVCOL_SPC_BT709;
225
226 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
227 return ret;
228
229 switch (version) {
230 case 0:
231 default:
232 /* Fraps v0 is a reordered YUV420 */
233 if (((avctx->width % 8) != 0) || ((avctx->height % 2) != 0)) {
234 av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
235 avctx->width, avctx->height);
236 return AVERROR_INVALIDDATA;
237 }
238
239 buf32 = (const uint32_t*)buf;
240 for (y = 0; y < avctx->height / 2; y++) {
241 luma1 = (uint32_t*)&f->data[0][ y * 2 * f->linesize[0] ];
242 luma2 = (uint32_t*)&f->data[0][ (y * 2 + 1) * f->linesize[0] ];
243 cr = (uint32_t*)&f->data[1][ y * f->linesize[1] ];
244 cb = (uint32_t*)&f->data[2][ y * f->linesize[2] ];
245 for (x = 0; x < avctx->width; x += 8) {
246 *luma1++ = *buf32++;
247 *luma1++ = *buf32++;
248 *luma2++ = *buf32++;
249 *luma2++ = *buf32++;
250 *cr++ = *buf32++;
251 *cb++ = *buf32++;
252 }
253 }
254 break;
255
256 case 1:
257 if (is_pal) {
258 uint32_t *pal = (uint32_t *)f->data[1];
259
260 for (y = 0; y < 256; y++) {
261 pal[y] = AV_RL32(buf) | 0xFF000000;
262 buf += 4;
263 }
264
265 for (y = 0; y <avctx->height; y++)
266 memcpy(&f->data[0][y * f->linesize[0]],
267 &buf[y * avctx->width],
268 avctx->width);
269 } else {
270 /* Fraps v1 is an upside-down BGR24 */
271 for (y = 0; y<avctx->height; y++)
272 memcpy(&f->data[0][(avctx->height - y - 1) * f->linesize[0]],
273 &buf[y * avctx->width * 3],
274 3 * avctx->width);
275 }
276 break;
277
278 case 2:
279 case 4:
280 /**
281 * Fraps v2 is Huffman-coded YUV420 planes
282 * Fraps v4 is virtually the same
283 */
284 for (i = 0; i < planes; i++) {
285 is_chroma = !!i;
286 if ((ret = fraps2_decode_plane(s, f->data[i], f->linesize[i],
287 avctx->width >> is_chroma,
288 avctx->height >> is_chroma,
289 buf + offs[i], offs[i + 1] - offs[i],
290 is_chroma, 1)) < 0) {
291 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
292 return ret;
293 }
294 }
295 break;
296 case 3:
297 case 5:
298 /* Virtually the same as version 4, but is for RGB24 */
299 for (i = 0; i < planes; i++) {
300 if ((ret = fraps2_decode_plane(s, f->data[0] + i + (f->linesize[0] * (avctx->height - 1)),
301 -f->linesize[0], avctx->width, avctx->height,
302 buf + offs[i], offs[i + 1] - offs[i], 0, 3)) < 0) {
303 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
304 return ret;
305 }
306 }
307 out = f->data[0];
308 // convert pseudo-YUV into real RGB
309 for (j = 0; j < avctx->height; j++) {
310 uint8_t *line_end = out + 3*avctx->width;
311 while (out < line_end) {
312 out[0] += out[1];
313 out[2] += out[1];
314 out += 3;
315 }
316 out += f->linesize[0] - 3*avctx->width;
317 }
318 break;
319 }
320
321 *got_frame = 1;
322
323 return buf_size;
324}
325
326
327/**
328 * closes decoder
329 * @param avctx codec context
330 * @return 0 on success or negative if fails
331 */
332static av_cold int decode_end(AVCodecContext *avctx)
333{
334 FrapsContext *s = (FrapsContext*)avctx->priv_data;
335
336 av_freep(&s->tmpbuf);
337 return 0;
338}
339
340
341AVCodec ff_fraps_decoder = {
342 .name = "fraps",
343 .long_name = NULL_IF_CONFIG_SMALL("Fraps"),
344 .type = AVMEDIA_TYPE_VIDEO,
345 .id = AV_CODEC_ID_FRAPS,
346 .priv_data_size = sizeof(FrapsContext),
347 .init = decode_init,
348 .close = decode_end,
349 .decode = decode_frame,
350 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
351 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
352};
353
generated by cgit at 2024-05-17 04:12:43 (GMT)