aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/fraps.c
blob: 4c4c46b60273dc682ff270b74cf8193d72363619 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
/*
 * Fraps FPS1 decoder
 * Copyright (c) 2005 Roine Gustafsson
 * Copyright (c) 2006 Konstantin Shishkov
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * Lossless Fraps 'FPS1' decoder
 * @author Roine Gustafsson (roine at users sf net)
 * @author Konstantin Shishkov
 *
 * Codec algorithm for version 0 is taken from Transcode <www.transcoding.org>
 *
 * Version 2 files support by Konstantin Shishkov
 */

#include "config.h"

#define CACHED_BITSTREAM_READER HAVE_FAST_64BIT
#define UNCHECKED_BITSTREAM_READER 1
#include "avcodec.h"
#include "get_bits.h"
#include "huffman.h"
#include "bytestream.h"
#include "bswapdsp.h"
#include "codec_internal.h"
#include "thread.h"

#define FPS_TAG MKTAG('F', 'P', 'S', 'x')
#define VLC_BITS 11

/**
 * local variable storage
 */
typedef struct FrapsContext {
    AVCodecContext *avctx;
    BswapDSPContext bdsp;
    uint8_t *tmpbuf;
    int tmpbuf_size;
} FrapsContext;


/**
 * initializes decoder
 * @param avctx codec context
 * @return 0 on success or negative if fails
 */
static av_cold int decode_init(AVCodecContext *avctx)
{
    FrapsContext * const s = avctx->priv_data;

    s->avctx  = avctx;
    s->tmpbuf = NULL;

    ff_bswapdsp_init(&s->bdsp);

    return 0;
}

/**
 * Comparator - our nodes should ascend by count
 * but with preserved symbol order
 */
static int huff_cmp(const void *va, const void *vb)
{
    const Node *a = va, *b = vb;
    return (a->count - b->count)*256 + a->sym - b->sym;
}

/**
 * decode Fraps v2 packed plane
 */
static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
                               int h, const uint8_t *src, int size, int Uoff,
                               const int step)
{
    int i, j, ret;
    GetBitContext gb;
    VLC vlc;
    Node nodes[512];

    for (i = 0; i < 256; i++)
        nodes[i].count = bytestream_get_le32(&src);
    size -= 1024;
    if ((ret = ff_huff_build_tree(s->avctx, &vlc, 256, VLC_BITS,
                                  nodes, huff_cmp,
                                  FF_HUFFMAN_FLAG_ZERO_COUNT)) < 0)
        return ret;
    /* we have built Huffman table and are ready to decode plane */

    /* convert bits so they may be used by standard bitreader */
    s->bdsp.bswap_buf((uint32_t *) s->tmpbuf,
                      (const uint32_t *) src, size >> 2);

    if ((ret = init_get_bits8(&gb, s->tmpbuf, size)) < 0)
        return ret;

    for (j = 0; j < h; j++) {
        for (i = 0; i < w*step; i += step) {
            dst[i] = get_vlc2(&gb, vlc.table, VLC_BITS, 3);
            /* lines are stored as deltas between previous lines
             * and we need to add 0x80 to the first lines of chroma planes
             */
            if (j)
                dst[i] += dst[i - stride];
            else if (Uoff)
                dst[i] += 0x80;
            if (get_bits_left(&gb) < 0) {
                ff_free_vlc(&vlc);
                return AVERROR_INVALIDDATA;
            }
        }
        dst += stride;
    }
    ff_free_vlc(&vlc);
    return 0;
}

static int decode_frame(AVCodecContext *avctx, AVFrame *f,
                        int *got_frame, AVPacket *avpkt)
{
    FrapsContext * const s = avctx->priv_data;
    const uint8_t *buf     = avpkt->data;
    int buf_size           = avpkt->size;
    uint32_t header;
    unsigned int version,header_size;
    const uint32_t *buf32;
    uint32_t *luma1,*luma2,*cb,*cr;
    uint32_t offs[4];
    int i, j, ret, is_chroma;
    const int planes = 3;
    int is_pal;
    uint8_t *out;

    if (buf_size < 4) {
        av_log(avctx, AV_LOG_ERROR, "Packet is too short\n");
        return AVERROR_INVALIDDATA;
    }

    header      = AV_RL32(buf);
    version     = header & 0xff;
    is_pal      = buf[1] == 2 && version == 1;
    header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */

    if (version > 5) {
        avpriv_report_missing_feature(avctx, "Fraps version %u", version);
        return AVERROR_PATCHWELCOME;
    }

    buf += header_size;

    if (is_pal) {
        unsigned needed_size = avctx->width * avctx->height + 1024;
        needed_size += header_size;
        if (buf_size != needed_size) {
            av_log(avctx, AV_LOG_ERROR,
                   "Invalid frame length %d (should be %d)\n",
                   buf_size, needed_size);
            return AVERROR_INVALIDDATA;
        }
    } else if (version < 2) {
        unsigned needed_size = avctx->width * avctx->height * 3;
        if (version == 0) needed_size /= 2;
        needed_size += header_size;
        /* bit 31 means same as previous pic */
        if (header & (1U<<31)) {
            *got_frame = 0;
            return buf_size;
        }
        if (buf_size != needed_size) {
            av_log(avctx, AV_LOG_ERROR,
                   "Invalid frame length %d (should be %d)\n",
                   buf_size, needed_size);
            return AVERROR_INVALIDDATA;
        }
    } else {
        /* skip frame */
        if (buf_size == 8) {
            *got_frame = 0;
            return buf_size;
        }
        if (AV_RL32(buf) != FPS_TAG || buf_size < planes*1024 + 24) {
            av_log(avctx, AV_LOG_ERROR, "error in data stream\n");
            return AVERROR_INVALIDDATA;
        }
        for (i = 0; i < planes; i++) {
            offs[i] = AV_RL32(buf + 4 + i * 4);
            if (offs[i] >= buf_size - header_size || (i && offs[i] <= offs[i - 1] + 1024)) {
                av_log(avctx, AV_LOG_ERROR, "plane %i offset is out of bounds\n", i);
                return AVERROR_INVALIDDATA;
            }
        }
        offs[planes] = buf_size - header_size;
        for (i = 0; i < planes; i++) {
            av_fast_padded_malloc(&s->tmpbuf, &s->tmpbuf_size, offs[i + 1] - offs[i] - 1024);
            if (!s->tmpbuf)
                return AVERROR(ENOMEM);
        }
    }

    f->pict_type = AV_PICTURE_TYPE_I;
    f->key_frame = 1;

    avctx->pix_fmt = version & 1 ? is_pal ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_BGR24 : AV_PIX_FMT_YUVJ420P;
    avctx->color_range = version & 1 ? AVCOL_RANGE_UNSPECIFIED
                                     : AVCOL_RANGE_JPEG;
    avctx->colorspace = version & 1 ? AVCOL_SPC_UNSPECIFIED : AVCOL_SPC_BT709;

    if ((ret = ff_thread_get_buffer(avctx, f, 0)) < 0)
        return ret;

    switch (version) {
    case 0:
    default:
        /* Fraps v0 is a reordered YUV420 */
        if (((avctx->width % 8) != 0) || ((avctx->height % 2) != 0)) {
            av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
                   avctx->width, avctx->height);
            return AVERROR_INVALIDDATA;
        }

        buf32 = (const uint32_t*)buf;
        for (ptrdiff_t y = 0; y < avctx->height / 2; y++) {
            luma1 = (uint32_t*)&f->data[0][  y * 2      * f->linesize[0] ];
            luma2 = (uint32_t*)&f->data[0][ (y * 2 + 1) * f->linesize[0] ];
            cr    = (uint32_t*)&f->data[1][  y          * f->linesize[1] ];
            cb    = (uint32_t*)&f->data[2][  y          * f->linesize[2] ];
            for (ptrdiff_t x = 0; x < avctx->width; x += 8) {
                *luma1++ = *buf32++;
                *luma1++ = *buf32++;
                *luma2++ = *buf32++;
                *luma2++ = *buf32++;
                *cr++    = *buf32++;
                *cb++    = *buf32++;
            }
        }
        break;

    case 1:
        if (is_pal) {
            uint32_t *pal = (uint32_t *)f->data[1];

            for (unsigned y = 0; y < 256; y++) {
                pal[y] = AV_RL32(buf) | 0xFF000000;
                buf += 4;
            }

            for (ptrdiff_t y = 0; y < avctx->height; y++)
                memcpy(&f->data[0][y * f->linesize[0]],
                       &buf[y * avctx->width],
                       avctx->width);
        } else {
        /* Fraps v1 is an upside-down BGR24 */
            for (ptrdiff_t y = 0; y < avctx->height; y++)
                memcpy(&f->data[0][(avctx->height - y - 1) * f->linesize[0]],
                       &buf[y * avctx->width * 3],
                       3 * avctx->width);
        }
        break;

    case 2:
    case 4:
        /**
         * Fraps v2 is Huffman-coded YUV420 planes
         * Fraps v4 is virtually the same
         */
        for (i = 0; i < planes; i++) {
            is_chroma = !!i;
            if ((ret = fraps2_decode_plane(s, f->data[i], f->linesize[i],
                                           avctx->width  >> is_chroma,
                                           avctx->height >> is_chroma,
                                           buf + offs[i], offs[i + 1] - offs[i],
                                           is_chroma, 1)) < 0) {
                av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
                return ret;
            }
        }
        break;
    case 3:
    case 5:
        /* Virtually the same as version 4, but is for RGB24 */
        for (i = 0; i < planes; i++) {
            if ((ret = fraps2_decode_plane(s, f->data[0] + i + (f->linesize[0] * (avctx->height - 1)),
                                           -f->linesize[0], avctx->width, avctx->height,
                                           buf + offs[i], offs[i + 1] - offs[i], 0, 3)) < 0) {
                av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
                return ret;
            }
        }
        out = f->data[0];
        // convert pseudo-YUV into real RGB
        for (j = 0; j < avctx->height; j++) {
            uint8_t *line_end = out + 3*avctx->width;
            while (out < line_end) {
                out[0]  += out[1];
                out[2]  += out[1];
                out += 3;
            }
            out += f->linesize[0] - 3*avctx->width;
        }
        break;
    }

    *got_frame = 1;

    return buf_size;
}


/**
 * closes decoder
 * @param avctx codec context
 * @return 0 on success or negative if fails
 */
static av_cold int decode_end(AVCodecContext *avctx)
{
    FrapsContext *s = (FrapsContext*)avctx->priv_data;

    av_freep(&s->tmpbuf);
    return 0;
}


const FFCodec ff_fraps_decoder = {
    .p.name         = "fraps",
    CODEC_LONG_NAME("Fraps"),
    .p.type         = AVMEDIA_TYPE_VIDEO,
    .p.id           = AV_CODEC_ID_FRAPS,
    .priv_data_size = sizeof(FrapsContext),
    .init           = decode_init,
    .close          = decode_end,
    FF_CODEC_DECODE_CB(decode_frame),
    .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
};