Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / fraps.c
CommitLineData
2ba45a60
DM
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 init_get_bits(&gb, s->tmpbuf, size * 8);
109 for (j = 0; j < h; j++) {
110 for (i = 0; i < w*step; i += step) {
111 dst[i] = get_vlc2(&gb, vlc.table, VLC_BITS, 3);
112 /* lines are stored as deltas between previous lines
113 * and we need to add 0x80 to the first lines of chroma planes
114 */
115 if (j)
116 dst[i] += dst[i - stride];
117 else if (Uoff)
118 dst[i] += 0x80;
119 if (get_bits_left(&gb) < 0) {
120 ff_free_vlc(&vlc);
121 return AVERROR_INVALIDDATA;
122 }
123 }
124 dst += stride;
125 }
126 ff_free_vlc(&vlc);
127 return 0;
128}
129
130static int decode_frame(AVCodecContext *avctx,
131 void *data, int *got_frame,
132 AVPacket *avpkt)
133{
134 FrapsContext * const s = avctx->priv_data;
135 const uint8_t *buf = avpkt->data;
136 int buf_size = avpkt->size;
137 ThreadFrame frame = { .f = data };
138 AVFrame * const f = data;
139 uint32_t header;
140 unsigned int version,header_size;
141 unsigned int x, y;
142 const uint32_t *buf32;
143 uint32_t *luma1,*luma2,*cb,*cr;
144 uint32_t offs[4];
145 int i, j, ret, is_chroma;
146 const int planes = 3;
147 uint8_t *out;
148
149 if (buf_size < 4) {
150 av_log(avctx, AV_LOG_ERROR, "Packet is too short\n");
151 return AVERROR_INVALIDDATA;
152 }
153
154 header = AV_RL32(buf);
155 version = header & 0xff;
156 header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */
157
158 if (version > 5) {
159 av_log(avctx, AV_LOG_ERROR,
160 "This file is encoded with Fraps version %d. " \
161 "This codec can only decode versions <= 5.\n", version);
162 return AVERROR_PATCHWELCOME;
163 }
164
165 buf += header_size;
166
167 if (version < 2) {
168 unsigned needed_size = avctx->width * avctx->height * 3;
169 if (version == 0) needed_size /= 2;
170 needed_size += header_size;
171 /* bit 31 means same as previous pic */
172 if (header & (1U<<31)) {
173 *got_frame = 0;
174 return buf_size;
175 }
176 if (buf_size != needed_size) {
177 av_log(avctx, AV_LOG_ERROR,
178 "Invalid frame length %d (should be %d)\n",
179 buf_size, needed_size);
180 return AVERROR_INVALIDDATA;
181 }
182 } else {
183 /* skip frame */
184 if (buf_size == 8) {
185 *got_frame = 0;
186 return buf_size;
187 }
188 if (AV_RL32(buf) != FPS_TAG || buf_size < planes*1024 + 24) {
189 av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
190 return AVERROR_INVALIDDATA;
191 }
192 for (i = 0; i < planes; i++) {
193 offs[i] = AV_RL32(buf + 4 + i * 4);
194 if (offs[i] >= buf_size - header_size || (i && offs[i] <= offs[i - 1] + 1024)) {
195 av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
196 return AVERROR_INVALIDDATA;
197 }
198 }
199 offs[planes] = buf_size - header_size;
200 for (i = 0; i < planes; i++) {
201 av_fast_padded_malloc(&s->tmpbuf, &s->tmpbuf_size, offs[i + 1] - offs[i] - 1024);
202 if (!s->tmpbuf)
203 return AVERROR(ENOMEM);
204 }
205 }
206
207 f->pict_type = AV_PICTURE_TYPE_I;
208 f->key_frame = 1;
209
210 avctx->pix_fmt = version & 1 ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_YUVJ420P;
211 avctx->color_range = version & 1 ? AVCOL_RANGE_UNSPECIFIED
212 : AVCOL_RANGE_JPEG;
213 avctx->colorspace = version & 1 ? AVCOL_SPC_UNSPECIFIED : AVCOL_SPC_BT709;
214
215 if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
216 return ret;
217
218 switch (version) {
219 case 0:
220 default:
221 /* Fraps v0 is a reordered YUV420 */
222 if (((avctx->width % 8) != 0) || ((avctx->height % 2) != 0)) {
223 av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
224 avctx->width, avctx->height);
225 return AVERROR_INVALIDDATA;
226 }
227
228 buf32 = (const uint32_t*)buf;
229 for (y = 0; y < avctx->height / 2; y++) {
230 luma1 = (uint32_t*)&f->data[0][ y * 2 * f->linesize[0] ];
231 luma2 = (uint32_t*)&f->data[0][ (y * 2 + 1) * f->linesize[0] ];
232 cr = (uint32_t*)&f->data[1][ y * f->linesize[1] ];
233 cb = (uint32_t*)&f->data[2][ y * f->linesize[2] ];
234 for (x = 0; x < avctx->width; x += 8) {
235 *luma1++ = *buf32++;
236 *luma1++ = *buf32++;
237 *luma2++ = *buf32++;
238 *luma2++ = *buf32++;
239 *cr++ = *buf32++;
240 *cb++ = *buf32++;
241 }
242 }
243 break;
244
245 case 1:
246 /* Fraps v1 is an upside-down BGR24 */
247 for (y = 0; y<avctx->height; y++)
248 memcpy(&f->data[0][(avctx->height - y - 1) * f->linesize[0]],
249 &buf[y * avctx->width * 3],
250 3 * avctx->width);
251 break;
252
253 case 2:
254 case 4:
255 /**
256 * Fraps v2 is Huffman-coded YUV420 planes
257 * Fraps v4 is virtually the same
258 */
259 for (i = 0; i < planes; i++) {
260 is_chroma = !!i;
261 if ((ret = fraps2_decode_plane(s, f->data[i], f->linesize[i],
262 avctx->width >> is_chroma,
263 avctx->height >> is_chroma,
264 buf + offs[i], offs[i + 1] - offs[i],
265 is_chroma, 1)) < 0) {
266 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
267 return ret;
268 }
269 }
270 break;
271 case 3:
272 case 5:
273 /* Virtually the same as version 4, but is for RGB24 */
274 for (i = 0; i < planes; i++) {
275 if ((ret = fraps2_decode_plane(s, f->data[0] + i + (f->linesize[0] * (avctx->height - 1)),
276 -f->linesize[0], avctx->width, avctx->height,
277 buf + offs[i], offs[i + 1] - offs[i], 0, 3)) < 0) {
278 av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
279 return ret;
280 }
281 }
282 out = f->data[0];
283 // convert pseudo-YUV into real RGB
284 for (j = 0; j < avctx->height; j++) {
285 uint8_t *line_end = out + 3*avctx->width;
286 while (out < line_end) {
287 out[0] += out[1];
288 out[2] += out[1];
289 out += 3;
290 }
291 out += f->linesize[0] - 3*avctx->width;
292 }
293 break;
294 }
295
296 *got_frame = 1;
297
298 return buf_size;
299}
300
301
302/**
303 * closes decoder
304 * @param avctx codec context
305 * @return 0 on success or negative if fails
306 */
307static av_cold int decode_end(AVCodecContext *avctx)
308{
309 FrapsContext *s = (FrapsContext*)avctx->priv_data;
310
311 av_freep(&s->tmpbuf);
312 return 0;
313}
314
315
316AVCodec ff_fraps_decoder = {
317 .name = "fraps",
318 .long_name = NULL_IF_CONFIG_SMALL("Fraps"),
319 .type = AVMEDIA_TYPE_VIDEO,
320 .id = AV_CODEC_ID_FRAPS,
321 .priv_data_size = sizeof(FrapsContext),
322 .init = decode_init,
323 .close = decode_end,
324 .decode = decode_frame,
325 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
326};