GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/tdsc.c Lines: 253 327 77.4 %
Date: 2021-04-22 14:24:15 Branches: 111 186 59.7 %

Line Branch Exec Source
1
/*
2
 * TDSC decoder
3
 * Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
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
 * TDSC decoder
25
 *
26
 * Fourcc: TSDC
27
 *
28
 * TDSC is very simple. It codes picture by tiles, storing them in raw BGR24
29
 * format or compressing them in JPEG. Frames can be full pictures or just
30
 * updates to the previous frame. Cursor is found in its own frame or at the
31
 * bottom of the picture. Every frame is then packed with zlib.
32
 *
33
 * Supports: BGR24
34
 */
35
36
#include <stdint.h>
37
#include <zlib.h>
38
39
#include "libavutil/imgutils.h"
40
41
#include "avcodec.h"
42
#include "bytestream.h"
43
#include "internal.h"
44
45
#define BITMAPINFOHEADER_SIZE 0x28
46
#define TDSF_HEADER_SIZE      0x56
47
#define TDSB_HEADER_SIZE      0x08
48
49
typedef struct TDSCContext {
50
    AVCodecContext *jpeg_avctx;   // wrapper context for MJPEG
51
52
    int width, height;
53
    GetByteContext gbc;
54
55
    AVFrame *refframe;          // full decoded frame (without cursor)
56
    AVPacket *jpkt;             // encoded JPEG tile
57
    AVFrame *jpgframe;          // decoded JPEG tile
58
    uint8_t *tilebuffer;        // buffer containing tile data
59
60
    /* zlib interaction */
61
    uint8_t *deflatebuffer;
62
    uLongf deflatelen;
63
64
    /* All that is cursor */
65
    uint8_t    *cursor;
66
    int        cursor_stride;
67
    int        cursor_w, cursor_h, cursor_x, cursor_y;
68
    int        cursor_hot_x, cursor_hot_y;
69
} TDSCContext;
70
71
/* 1 byte bits, 1 byte planes, 2 bytes format (probably) */
72
enum TDSCCursorFormat {
73
    CUR_FMT_MONO = 0x01010004,
74
    CUR_FMT_BGRA = 0x20010004,
75
    CUR_FMT_RGBA = 0x20010008,
76
};
77
78
2
static av_cold int tdsc_close(AVCodecContext *avctx)
79
{
80
2
    TDSCContext *ctx = avctx->priv_data;
81
82
2
    av_frame_free(&ctx->refframe);
83
2
    av_frame_free(&ctx->jpgframe);
84
2
    av_packet_free(&ctx->jpkt);
85
2
    av_freep(&ctx->deflatebuffer);
86
2
    av_freep(&ctx->tilebuffer);
87
2
    av_freep(&ctx->cursor);
88
2
    avcodec_free_context(&ctx->jpeg_avctx);
89
90
2
    return 0;
91
}
92
93
2
static av_cold int tdsc_init(AVCodecContext *avctx)
94
{
95
2
    TDSCContext *ctx = avctx->priv_data;
96
    const AVCodec *codec;
97
    int ret;
98
99
2
    avctx->pix_fmt = AV_PIX_FMT_BGR24;
100
101
    /* These needs to be set to estimate buffer and frame size */
102

2
    if (!(avctx->width && avctx->height)) {
103
        av_log(avctx, AV_LOG_ERROR, "Video size not set.\n");
104
        return AVERROR_INVALIDDATA;
105
    }
106
107
    /* This value should be large enough for a RAW-only frame plus headers */
108
2
    ctx->deflatelen = avctx->width * avctx->height * (3 + 1);
109
2
    ret = av_reallocp(&ctx->deflatebuffer, ctx->deflatelen);
110
2
    if (ret < 0)
111
        return ret;
112
113
    /* Allocate reference and JPEG frame */
114
2
    ctx->refframe = av_frame_alloc();
115
2
    ctx->jpgframe = av_frame_alloc();
116
2
    ctx->jpkt     = av_packet_alloc();
117

2
    if (!ctx->refframe || !ctx->jpgframe || !ctx->jpkt)
118
        return AVERROR(ENOMEM);
119
120
    /* Prepare everything needed for JPEG decoding */
121
2
    codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG);
122
2
    if (!codec)
123
        return AVERROR_BUG;
124
2
    ctx->jpeg_avctx = avcodec_alloc_context3(codec);
125
2
    if (!ctx->jpeg_avctx)
126
        return AVERROR(ENOMEM);
127
2
    ctx->jpeg_avctx->flags = avctx->flags;
128
2
    ctx->jpeg_avctx->flags2 = avctx->flags2;
129
2
    ctx->jpeg_avctx->dct_algo = avctx->dct_algo;
130
2
    ctx->jpeg_avctx->idct_algo = avctx->idct_algo;
131
2
    ret = avcodec_open2(ctx->jpeg_avctx, codec, NULL);
132
2
    if (ret < 0)
133
        return ret;
134
135
    /* Set the output pixel format on the reference frame */
136
2
    ctx->refframe->format = avctx->pix_fmt;
137
138
2
    return 0;
139
}
140
141
#define APPLY_ALPHA(src, new, alpha) \
142
    src = (src * (256 - alpha) + new * alpha) >> 8
143
144
/* Paint a region over a buffer, without drawing out of its bounds. */
145
41
static void tdsc_paint_cursor(AVCodecContext *avctx, uint8_t *dst, int stride)
146
{
147
41
    TDSCContext *ctx = avctx->priv_data;
148
41
    const uint8_t *cursor = ctx->cursor;
149
41
    int x = ctx->cursor_x - ctx->cursor_hot_x;
150
41
    int y = ctx->cursor_y - ctx->cursor_hot_y;
151
41
    int w = ctx->cursor_w;
152
41
    int h = ctx->cursor_h;
153
    int i, j;
154
155
41
    if (!ctx->cursor)
156
17
        return;
157
158
24
    if (x + w > ctx->width)
159
        w = ctx->width - x;
160
24
    if (y + h > ctx->height)
161
        h = ctx->height - y;
162
24
    if (x < 0) {
163
        w      +=  x;
164
        cursor += -x * 4;
165
    } else {
166
24
        dst    +=  x * 3;
167
    }
168
24
    if (y < 0) {
169
        h      +=  y;
170
        cursor += -y * ctx->cursor_stride;
171
    } else {
172
24
        dst    +=  y * stride;
173
    }
174

24
    if (w < 0 || h < 0)
175
        return;
176
177
799
    for (j = 0; j < h; j++) {
178
25926
        for (i = 0; i < w; i++) {
179
25151
            uint8_t alpha = cursor[i * 4];
180
25151
            APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
181
25151
            APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
182
25151
            APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
183
        }
184
775
        dst    += stride;
185
775
        cursor += ctx->cursor_stride;
186
    }
187
}
188
189
/* Load cursor data and store it in ABGR mode. */
190
3
static int tdsc_load_cursor(AVCodecContext *avctx)
191
{
192
3
    TDSCContext *ctx  = avctx->priv_data;
193
    int i, j, k, ret, cursor_fmt;
194
    uint8_t *dst;
195
196
3
    ctx->cursor_hot_x = bytestream2_get_le16(&ctx->gbc);
197
3
    ctx->cursor_hot_y = bytestream2_get_le16(&ctx->gbc);
198
3
    ctx->cursor_w     = bytestream2_get_le16(&ctx->gbc);
199
3
    ctx->cursor_h     = bytestream2_get_le16(&ctx->gbc);
200
201
3
    ctx->cursor_stride = FFALIGN(ctx->cursor_w, 32) * 4;
202
3
    cursor_fmt = bytestream2_get_le32(&ctx->gbc);
203
204

3
    if (ctx->cursor_x >= avctx->width || ctx->cursor_y >= avctx->height) {
205
        av_log(avctx, AV_LOG_ERROR,
206
               "Invalid cursor position (%d.%d outside %dx%d).\n",
207
               ctx->cursor_x, ctx->cursor_y, avctx->width, avctx->height);
208
        return AVERROR_INVALIDDATA;
209
    }
210

3
    if (ctx->cursor_w < 1 || ctx->cursor_w > 256 ||
211

3
        ctx->cursor_h < 1 || ctx->cursor_h > 256) {
212
        av_log(avctx, AV_LOG_ERROR,
213
               "Invalid cursor dimensions %dx%d.\n",
214
               ctx->cursor_w, ctx->cursor_h);
215
        return AVERROR_INVALIDDATA;
216
    }
217
3
    if (ctx->cursor_hot_x > ctx->cursor_w ||
218
3
        ctx->cursor_hot_y > ctx->cursor_h) {
219
        av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %d.%d.\n",
220
               ctx->cursor_hot_x, ctx->cursor_hot_y);
221
        ctx->cursor_hot_x = FFMIN(ctx->cursor_hot_x, ctx->cursor_w - 1);
222
        ctx->cursor_hot_y = FFMIN(ctx->cursor_hot_y, ctx->cursor_h - 1);
223
    }
224
225
3
    ret = av_reallocp(&ctx->cursor, ctx->cursor_stride * ctx->cursor_h);
226
3
    if (ret < 0) {
227
        av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer.\n");
228
        return ret;
229
    }
230
231
3
    dst = ctx->cursor;
232
    /* here data is packed in BE */
233
3
    switch (cursor_fmt) {
234
2
    case CUR_FMT_MONO:
235
66
        for (j = 0; j < ctx->cursor_h; j++) {
236
128
            for (i = 0; i < ctx->cursor_w; i += 32) {
237
64
                uint32_t bits = bytestream2_get_be32(&ctx->gbc);
238
2112
                for (k = 0; k < 32; k++) {
239
2048
                    dst[0] = !!(bits & 0x80000000);
240
2048
                    dst   += 4;
241
2048
                    bits <<= 1;
242
                }
243
            }
244
64
            dst += ctx->cursor_stride - ctx->cursor_w * 4;
245
        }
246
247
2
        dst = ctx->cursor;
248
66
        for (j = 0; j < ctx->cursor_h; j++) {
249
128
            for (i = 0; i < ctx->cursor_w; i += 32) {
250
64
                uint32_t bits = bytestream2_get_be32(&ctx->gbc);
251
2112
                for (k = 0; k < 32; k++) {
252
2048
                    int mask_bit = !!(bits & 0x80000000);
253
2048
                    switch (dst[0] * 2 + mask_bit) {
254
104
                    case 0:
255
104
                        dst[0] = 0xFF;
256
104
                        dst[1] = 0x00;
257
104
                        dst[2] = 0x00;
258
104
                        dst[3] = 0x00;
259
104
                        break;
260
178
                    case 1:
261
178
                        dst[0] = 0xFF;
262
178
                        dst[1] = 0xFF;
263
178
                        dst[2] = 0xFF;
264
178
                        dst[3] = 0xFF;
265
178
                        break;
266
1766
                    default:
267
1766
                        dst[0] = 0x00;
268
1766
                        dst[1] = 0x00;
269
1766
                        dst[2] = 0x00;
270
1766
                        dst[3] = 0x00;
271
                    }
272
2048
                    dst   += 4;
273
2048
                    bits <<= 1;
274
                }
275
            }
276
64
            dst += ctx->cursor_stride - ctx->cursor_w * 4;
277
        }
278
2
        break;
279
1
    case CUR_FMT_BGRA:
280
    case CUR_FMT_RGBA:
281
        /* Skip monochrome version of the cursor */
282
1
        bytestream2_skip(&ctx->gbc,
283
1
                         ctx->cursor_h * (FFALIGN(ctx->cursor_w, 32) >> 3));
284
1
        if (cursor_fmt & 8) { // RGBA -> ABGR
285
40
            for (j = 0; j < ctx->cursor_h; j++) {
286
1638
                for (i = 0; i < ctx->cursor_w; i++) {
287
1599
                    int val = bytestream2_get_be32(&ctx->gbc);
288
1599
                    *dst++ = val >> 24;
289
1599
                    *dst++ = val >> 16;
290
1599
                    *dst++ = val >>  8;
291
1599
                    *dst++ = val >>  0;
292
                }
293
39
                dst += ctx->cursor_stride - ctx->cursor_w * 4;
294
            }
295
        } else { // BGRA -> ABGR
296
            for (j = 0; j < ctx->cursor_h; j++) {
297
                for (i = 0; i < ctx->cursor_w; i++) {
298
                    int val = bytestream2_get_be32(&ctx->gbc);
299
                    *dst++ = val >>  0;
300
                    *dst++ = val >> 24;
301
                    *dst++ = val >> 16;
302
                    *dst++ = val >>  8;
303
                }
304
                dst += ctx->cursor_stride - ctx->cursor_w * 4;
305
            }
306
        }
307
1
        break;
308
    default:
309
        avpriv_request_sample(avctx, "Cursor format %08x", cursor_fmt);
310
        return AVERROR_PATCHWELCOME;
311
    }
312
313
3
    return 0;
314
}
315
316
/* Convert a single YUV pixel to RGB. */
317
1231360
static inline void tdsc_yuv2rgb(uint8_t *out, int Y, int U, int V)
318
{
319
1231360
    out[0] = av_clip_uint8(Y + (             91881 * V + 32768 >> 16));
320
1231360
    out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
321
1231360
    out[2] = av_clip_uint8(Y + (116130 * U             + 32768 >> 16));
322
1231360
}
323
324
/* Convert a YUV420 buffer to a RGB buffer. */
325
273
static av_always_inline void tdsc_blit(uint8_t *dst, int dst_stride,
326
                                       const uint8_t *srcy, int srcy_stride,
327
                                       const uint8_t *srcu, const uint8_t *srcv,
328
                                       int srcuv_stride, int width, int height)
329
{
330
    int col, line;
331
8305
    for (line = 0; line < height; line++) {
332
1239392
        for (col = 0; col < width; col++)
333
1231360
            tdsc_yuv2rgb(dst + col * 3, srcy[col],
334
1231360
                         srcu[col >> 1] - 128, srcv[col >> 1] - 128);
335
336
8032
        dst  +=   dst_stride;
337
8032
        srcy +=  srcy_stride;
338
8032
        srcu += srcuv_stride * (line & 1);
339
8032
        srcv += srcuv_stride * (line & 1);
340
    }
341
273
}
342
343
/* Invoke the MJPEG decoder to decode the tile. */
344
273
static int tdsc_decode_jpeg_tile(AVCodecContext *avctx, int tile_size,
345
                                 int x, int y, int w, int h)
346
{
347
273
    TDSCContext *ctx = avctx->priv_data;
348
    int ret;
349
350
    /* Prepare a packet and send to the MJPEG decoder */
351
273
    av_packet_unref(ctx->jpkt);
352
273
    ctx->jpkt->data = ctx->tilebuffer;
353
273
    ctx->jpkt->size = tile_size;
354
355
273
    ret = avcodec_send_packet(ctx->jpeg_avctx, ctx->jpkt);
356
273
    if (ret < 0) {
357
        av_log(avctx, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
358
        return ret;
359
    }
360
361
273
    ret = avcodec_receive_frame(ctx->jpeg_avctx, ctx->jpgframe);
362

273
    if (ret < 0 || ctx->jpgframe->format != AV_PIX_FMT_YUVJ420P) {
363
        av_log(avctx, AV_LOG_ERROR,
364
               "JPEG decoding error (%d).\n", ret);
365
366
        /* Normally skip, error if explode */
367
        if (avctx->err_recognition & AV_EF_EXPLODE)
368
            return AVERROR_INVALIDDATA;
369
        else
370
            return 0;
371
    }
372
373
    /* Let's paint onto the buffer */
374
273
    tdsc_blit(ctx->refframe->data[0] + x * 3 + ctx->refframe->linesize[0] * y,
375
273
              ctx->refframe->linesize[0],
376
273
              ctx->jpgframe->data[0], ctx->jpgframe->linesize[0],
377
273
              ctx->jpgframe->data[1], ctx->jpgframe->data[2],
378
273
              ctx->jpgframe->linesize[1], w, h);
379
380
273
    av_frame_unref(ctx->jpgframe);
381
382
273
    return 0;
383
}
384
385
/* Parse frame and either copy data or decode JPEG. */
386
36
static int tdsc_decode_tiles(AVCodecContext *avctx, int number_tiles)
387
{
388
36
    TDSCContext *ctx = avctx->priv_data;
389
    int i;
390
391
    /* Iterate over the number of tiles */
392
598
    for (i = 0; i < number_tiles; i++) {
393
        int tile_size;
394
        int tile_mode;
395
        int x, y, x2, y2, w, h;
396
        int ret;
397
398

1124
        if (bytestream2_get_bytes_left(&ctx->gbc) < 4 ||
399
1124
            bytestream2_get_le32(&ctx->gbc) != MKTAG('T','D','S','B') ||
400
562
            bytestream2_get_bytes_left(&ctx->gbc) < TDSB_HEADER_SIZE - 4) {
401
            av_log(avctx, AV_LOG_ERROR, "TDSB tag is too small.\n");
402
            return AVERROR_INVALIDDATA;
403
        }
404
405
562
        tile_size = bytestream2_get_le32(&ctx->gbc);
406
562
        if (bytestream2_get_bytes_left(&ctx->gbc) < tile_size)
407
            return AVERROR_INVALIDDATA;
408
409
562
        tile_mode = bytestream2_get_le32(&ctx->gbc);
410
562
        bytestream2_skip(&ctx->gbc, 4); // unknown
411
562
        x = bytestream2_get_le32(&ctx->gbc);
412
562
        y = bytestream2_get_le32(&ctx->gbc);
413
562
        x2 = bytestream2_get_le32(&ctx->gbc);
414
562
        y2 = bytestream2_get_le32(&ctx->gbc);
415
416


562
        if (x < 0 || y < 0 || x2 <= x || y2 <= y ||
417

562
            x2 > ctx->width || y2 > ctx->height
418
        ) {
419
            av_log(avctx, AV_LOG_ERROR,
420
                   "Invalid tile position (%d.%d %d.%d outside %dx%d).\n",
421
                   x, y, x2, y2, ctx->width, ctx->height);
422
            return AVERROR_INVALIDDATA;
423
        }
424
562
        w = x2 - x;
425
562
        h = y2 - y;
426
427
562
        ret = av_reallocp(&ctx->tilebuffer, tile_size);
428
562
        if (!ctx->tilebuffer)
429
            return ret;
430
431
562
        bytestream2_get_buffer(&ctx->gbc, ctx->tilebuffer, tile_size);
432
433
562
        if (tile_mode == MKTAG('G','E','P','J')) {
434
            /* Decode JPEG tile and copy it in the reference frame */
435
273
            ret = tdsc_decode_jpeg_tile(avctx, tile_size, x, y, w, h);
436
273
            if (ret < 0)
437
                return ret;
438
289
        } else if (tile_mode == MKTAG(' ','W','A','R')) {
439
            /* Just copy the buffer to output */
440
289
            av_image_copy_plane(ctx->refframe->data[0] + x * 3 +
441
289
                                ctx->refframe->linesize[0] * y,
442
289
                                ctx->refframe->linesize[0], ctx->tilebuffer,
443
                                w * 3, w * 3, h);
444
        } else {
445
            av_log(avctx, AV_LOG_ERROR, "Unknown tile type %08x.\n", tile_mode);
446
            return AVERROR_INVALIDDATA;
447
        }
448
562
        av_log(avctx, AV_LOG_DEBUG, "Tile %d, %dx%d (%d.%d)\n", i, w, h, x, y);
449
    }
450
451
36
    return 0;
452
}
453
454
36
static int tdsc_parse_tdsf(AVCodecContext *avctx, int number_tiles)
455
{
456
36
    TDSCContext *ctx = avctx->priv_data;
457
36
    int ret, w, h, init_refframe = !ctx->refframe->data[0];
458
459
    /* BITMAPINFOHEADER
460
     * http://msdn.microsoft.com/en-us/library/windows/desktop/dd183376.aspx */
461
36
    if (bytestream2_get_le32(&ctx->gbc) != BITMAPINFOHEADER_SIZE)
462
        return AVERROR_INVALIDDATA;
463
464
    /* Store size, but wait for context reinit before updating avctx */
465
36
    w =  bytestream2_get_le32(&ctx->gbc);
466
36
    h = -bytestream2_get_le32(&ctx->gbc);
467
468

72
    if (bytestream2_get_le16(&ctx->gbc) != 1 ||  // 1 plane
469
36
        bytestream2_get_le16(&ctx->gbc) != 24)   // BGR24
470
        return AVERROR_INVALIDDATA;
471
472
36
    bytestream2_skip(&ctx->gbc, 24); // unused fields
473
474
    /* Update sizes */
475

36
    if (avctx->width != w || avctx->height != h) {
476
        av_log(avctx, AV_LOG_DEBUG, "Size update %dx%d -> %d%d.\n",
477
               avctx->width, avctx->height, ctx->width, ctx->height);
478
        ret = ff_set_dimensions(avctx, w, h);
479
        if (ret < 0)
480
            return ret;
481
        init_refframe = 1;
482
    }
483
36
    ctx->refframe->width  = ctx->width  = w;
484
36
    ctx->refframe->height = ctx->height = h;
485
486
    /* Allocate the reference frame if not already done or on size change */
487
36
    if (init_refframe) {
488
1
        ret = av_frame_get_buffer(ctx->refframe, 0);
489
1
        if (ret < 0)
490
            return ret;
491
    }
492
493
    /* Decode all tiles in a frame */
494
36
    return tdsc_decode_tiles(avctx, number_tiles);
495
}
496
497
34
static int tdsc_parse_dtsm(AVCodecContext *avctx)
498
{
499
34
    TDSCContext *ctx = avctx->priv_data;
500
    int ret;
501
34
    int action = bytestream2_get_le32(&ctx->gbc);
502
503
34
    bytestream2_skip(&ctx->gbc, 4); // some kind of ID or version maybe?
504
505

34
    if (action == 2 || action == 3) {
506
        /* Load cursor coordinates */
507
34
        ctx->cursor_x = bytestream2_get_le32(&ctx->gbc);
508
34
        ctx->cursor_y = bytestream2_get_le32(&ctx->gbc);
509
510
        /* Load a full cursor sprite */
511
34
        if (action == 3) {
512
3
            ret = tdsc_load_cursor(avctx);
513
            /* Do not consider cursor errors fatal unless in explode mode */
514

3
            if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
515
                return ret;
516
        }
517
    } else {
518
        avpriv_request_sample(avctx, "Cursor action %d", action);
519
    }
520
521
34
    return 0;
522
}
523
524
42
static int tdsc_decode_frame(AVCodecContext *avctx, void *data,
525
                             int *got_frame, AVPacket *avpkt)
526
{
527
42
    TDSCContext *ctx = avctx->priv_data;
528
42
    AVFrame *frame = data;
529
42
    int ret, tag_header, keyframe = 0;
530
    uLongf dlen;
531
532
    /* Resize deflate buffer on resolution change */
533

42
    if (ctx->width != avctx->width || ctx->height != avctx->height) {
534
1
        int deflatelen = avctx->width * avctx->height * (3 + 1);
535
1
        if (deflatelen != ctx->deflatelen) {
536
            ctx->deflatelen =deflatelen;
537
            ret = av_reallocp(&ctx->deflatebuffer, ctx->deflatelen);
538
            if (ret < 0) {
539
                ctx->deflatelen = 0;
540
                return ret;
541
            }
542
        }
543
    }
544
42
    dlen = ctx->deflatelen;
545
546
    /* Frames are deflated, need to inflate them first */
547
42
    ret = uncompress(ctx->deflatebuffer, &dlen, avpkt->data, avpkt->size);
548
42
    if (ret) {
549
1
        av_log(avctx, AV_LOG_ERROR, "Deflate error %d.\n", ret);
550
1
        return AVERROR_UNKNOWN;
551
    }
552
553
41
    bytestream2_init(&ctx->gbc, ctx->deflatebuffer, dlen);
554
555
    /* Check for tag and for size info */
556
41
    if (bytestream2_get_bytes_left(&ctx->gbc) < 4 + 4) {
557
        av_log(avctx, AV_LOG_ERROR, "Frame is too small.\n");
558
        return AVERROR_INVALIDDATA;
559
    }
560
561
    /* Read tag */
562
41
    tag_header = bytestream2_get_le32(&ctx->gbc);
563
564
41
    if (tag_header == MKTAG('T','D','S','F')) {
565
        int number_tiles;
566
36
        if (bytestream2_get_bytes_left(&ctx->gbc) < TDSF_HEADER_SIZE) {
567
            av_log(avctx, AV_LOG_ERROR, "TDSF tag is too small.\n");
568
            return AVERROR_INVALIDDATA;
569
        }
570
        /* First 4 bytes here are the number of GEPJ/WAR tiles in this frame */
571
36
        number_tiles = bytestream2_get_le32(&ctx->gbc);
572
573
36
        bytestream2_skip(&ctx->gbc, 4); // internal timestamp maybe?
574
36
        keyframe = bytestream2_get_le32(&ctx->gbc) == 0x30;
575
576
36
        ret = tdsc_parse_tdsf(avctx, number_tiles);
577
36
        if (ret < 0)
578
            return ret;
579
580
        /* Check if there is anything else we are able to parse */
581
36
        if (bytestream2_get_bytes_left(&ctx->gbc) >= 4 + 4)
582
31
            tag_header = bytestream2_get_le32(&ctx->gbc);
583
    }
584
585
    /* This tag can be after a TDSF block or on its own frame */
586
41
    if (tag_header == MKTAG('D','T','S','M')) {
587
        /* First 4 bytes here are the total size in bytes for this frame */
588
34
        int tag_size = bytestream2_get_le32(&ctx->gbc);
589
590
34
        if (bytestream2_get_bytes_left(&ctx->gbc) < tag_size) {
591
            av_log(avctx, AV_LOG_ERROR, "DTSM tag is too small.\n");
592
            return AVERROR_INVALIDDATA;
593
        }
594
595
34
        ret = tdsc_parse_dtsm(avctx);
596
34
        if (ret < 0)
597
            return ret;
598
    }
599
600
    /* Get the output frame and copy the reference frame */
601
41
    ret = ff_get_buffer(avctx, frame, 0);
602
41
    if (ret < 0)
603
        return ret;
604
605
41
    ret = av_frame_copy(frame, ctx->refframe);
606
41
    if (ret < 0)
607
        return ret;
608
609
    /* Paint the cursor on the output frame */
610
41
    tdsc_paint_cursor(avctx, frame->data[0], frame->linesize[0]);
611
612
    /* Frame is ready to be output */
613
41
    if (keyframe) {
614
2
        frame->pict_type = AV_PICTURE_TYPE_I;
615
2
        frame->key_frame = 1;
616
    } else {
617
39
        frame->pict_type = AV_PICTURE_TYPE_P;
618
    }
619
41
    *got_frame = 1;
620
621
41
    return avpkt->size;
622
}
623
624
AVCodec ff_tdsc_decoder = {
625
    .name           = "tdsc",
626
    .long_name      = NULL_IF_CONFIG_SMALL("TDSC"),
627
    .type           = AVMEDIA_TYPE_VIDEO,
628
    .id             = AV_CODEC_ID_TDSC,
629
    .init           = tdsc_init,
630
    .decode         = tdsc_decode_frame,
631
    .close          = tdsc_close,
632
    .priv_data_size = sizeof(TDSCContext),
633
    .capabilities   = AV_CODEC_CAP_DR1,
634
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |
635
                      FF_CODEC_CAP_INIT_CLEANUP,
636
};