FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/tdsc.c
Date: 2025-04-25 22:50:00
Exec Total Coverage
Lines: 249 322 77.3%
Functions: 11 11 100.0%
Branches: 110 184 59.8%
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/attributes_internal.h"
40 #include "libavutil/imgutils.h"
41 #include "libavutil/mem.h"
42
43 #include "avcodec.h"
44 #include "bytestream.h"
45 #include "codec_internal.h"
46 #include "decode.h"
47
48 #define BITMAPINFOHEADER_SIZE 0x28
49 #define TDSF_HEADER_SIZE 0x56
50 #define TDSB_HEADER_SIZE 0x08
51
52 typedef struct TDSCContext {
53 AVCodecContext *jpeg_avctx; // wrapper context for MJPEG
54
55 int width, height;
56 GetByteContext gbc;
57
58 AVFrame *refframe; // full decoded frame (without cursor)
59 AVPacket *jpkt; // encoded JPEG tile
60 AVFrame *jpgframe; // decoded JPEG tile
61 uint8_t *tilebuffer; // buffer containing tile data
62
63 /* zlib interaction */
64 uint8_t *deflatebuffer;
65 uLongf deflatelen;
66
67 /* All that is cursor */
68 uint8_t *cursor;
69 int cursor_stride;
70 int cursor_w, cursor_h, cursor_x, cursor_y;
71 int cursor_hot_x, cursor_hot_y;
72 } TDSCContext;
73
74 /* 1 byte bits, 1 byte planes, 2 bytes format (probably) */
75 enum TDSCCursorFormat {
76 CUR_FMT_MONO = 0x01010004,
77 CUR_FMT_BGRA = 0x20010004,
78 CUR_FMT_RGBA = 0x20010008,
79 };
80
81 2 static av_cold int tdsc_close(AVCodecContext *avctx)
82 {
83 2 TDSCContext *ctx = avctx->priv_data;
84
85 2 av_frame_free(&ctx->refframe);
86 2 av_frame_free(&ctx->jpgframe);
87 2 av_packet_free(&ctx->jpkt);
88 2 av_freep(&ctx->deflatebuffer);
89 2 av_freep(&ctx->tilebuffer);
90 2 av_freep(&ctx->cursor);
91 2 avcodec_free_context(&ctx->jpeg_avctx);
92
93 2 return 0;
94 }
95
96 2 static av_cold int tdsc_init(AVCodecContext *avctx)
97 {
98 2 TDSCContext *ctx = avctx->priv_data;
99 int ret;
100
101 2 avctx->pix_fmt = AV_PIX_FMT_BGR24;
102
103 /* These needs to be set to estimate buffer and frame size */
104
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 2 if (!(avctx->width && avctx->height)) {
105 ✗ av_log(avctx, AV_LOG_ERROR, "Video size not set.\n");
106 ✗ return AVERROR_INVALIDDATA;
107 }
108
109 /* This value should be large enough for a RAW-only frame plus headers */
110 2 ctx->deflatelen = avctx->width * avctx->height * (3 + 1);
111 2 ret = av_reallocp(&ctx->deflatebuffer, ctx->deflatelen);
112
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 2 if (ret < 0)
113 ✗ return ret;
114
115 /* Allocate reference and JPEG frame */
116 2 ctx->refframe = av_frame_alloc();
117 2 ctx->jpgframe = av_frame_alloc();
118 2 ctx->jpkt = av_packet_alloc();
119
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 2 if (!ctx->refframe || !ctx->jpgframe || !ctx->jpkt)
120 ✗ return AVERROR(ENOMEM);
121
122 /* Prepare everything needed for JPEG decoding */
123 EXTERN const FFCodec ff_mjpeg_decoder;
124 2 ctx->jpeg_avctx = avcodec_alloc_context3(&ff_mjpeg_decoder.p);
125
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 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->idct_algo = avctx->idct_algo;
130 2 ret = avcodec_open2(ctx->jpeg_avctx, NULL, NULL);
131
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 2 if (ret < 0)
132 ✗ return ret;
133
134 /* Set the output pixel format on the reference frame */
135 2 ctx->refframe->format = avctx->pix_fmt;
136
137 2 return 0;
138 }
139
140 #define APPLY_ALPHA(src, new, alpha) \
141 src = (src * (256 - alpha) + new * alpha) >> 8
142
143 /* Paint a region over a buffer, without drawing out of its bounds. */
144 41 static void tdsc_paint_cursor(AVCodecContext *avctx, uint8_t *dst, int stride)
145 {
146 41 TDSCContext *ctx = avctx->priv_data;
147 41 const uint8_t *cursor = ctx->cursor;
148 41 int x = ctx->cursor_x - ctx->cursor_hot_x;
149 41 int y = ctx->cursor_y - ctx->cursor_hot_y;
150 41 int w = ctx->cursor_w;
151 41 int h = ctx->cursor_h;
152 int i, j;
153
154
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 41 if (!ctx->cursor)
155 17 return;
156
157
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 24 if (x + w > ctx->width)
158 ✗ w = ctx->width - x;
159
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 24 if (y + h > ctx->height)
160 ✗ h = ctx->height - y;
161
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 24 if (x < 0) {
162 ✗ w += x;
163 ✗ cursor += -x * 4;
164 } else {
165 24 dst += x * 3;
166 }
167
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 24 if (y < 0) {
168 ✗ h += y;
169 ✗ cursor += -y * ctx->cursor_stride;
170 } else {
171 24 dst += y * stride;
172 }
173
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 24 if (w < 0 || h < 0)
174 ✗ return;
175
176
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 799 for (j = 0; j < h; j++) {
177
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 25926 for (i = 0; i < w; i++) {
178 25151 uint8_t alpha = cursor[i * 4];
179 25151 APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
180 25151 APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
181 25151 APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
182 }
183 775 dst += stride;
184 775 cursor += ctx->cursor_stride;
185 }
186 }
187
188 /* Load cursor data and store it in ABGR mode. */
189 3 static int tdsc_load_cursor(AVCodecContext *avctx)
190 {
191 3 TDSCContext *ctx = avctx->priv_data;
192 int i, j, k, ret, cursor_fmt;
193 uint8_t *dst;
194
195 3 ctx->cursor_hot_x = bytestream2_get_le16(&ctx->gbc);
196 3 ctx->cursor_hot_y = bytestream2_get_le16(&ctx->gbc);
197 3 ctx->cursor_w = bytestream2_get_le16(&ctx->gbc);
198 3 ctx->cursor_h = bytestream2_get_le16(&ctx->gbc);
199
200 3 ctx->cursor_stride = FFALIGN(ctx->cursor_w, 32) * 4;
201 3 cursor_fmt = bytestream2_get_le32(&ctx->gbc);
202
203
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 3 if (ctx->cursor_x >= avctx->width || ctx->cursor_y >= avctx->height) {
204 ✗ av_log(avctx, AV_LOG_ERROR,
205 "Invalid cursor position (%d.%d outside %dx%d).\n",
206 ctx->cursor_x, ctx->cursor_y, avctx->width, avctx->height);
207 ✗ return AVERROR_INVALIDDATA;
208 }
209
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 3 if (ctx->cursor_w < 1 || ctx->cursor_w > 256 ||
210
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 3 ctx->cursor_h < 1 || ctx->cursor_h > 256) {
211 ✗ av_log(avctx, AV_LOG_ERROR,
212 "Invalid cursor dimensions %dx%d.\n",
213 ctx->cursor_w, ctx->cursor_h);
214 ✗ return AVERROR_INVALIDDATA;
215 }
216
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 3 if (ctx->cursor_hot_x > ctx->cursor_w ||
217
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 3 ctx->cursor_hot_y > ctx->cursor_h) {
218 ✗ av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %d.%d.\n",
219 ctx->cursor_hot_x, ctx->cursor_hot_y);
220 ✗ ctx->cursor_hot_x = FFMIN(ctx->cursor_hot_x, ctx->cursor_w - 1);
221 ✗ ctx->cursor_hot_y = FFMIN(ctx->cursor_hot_y, ctx->cursor_h - 1);
222 }
223
224 3 ret = av_reallocp(&ctx->cursor, ctx->cursor_stride * ctx->cursor_h);
225
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 3 if (ret < 0) {
226 ✗ av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer.\n");
227 ✗ return ret;
228 }
229
230 3 dst = ctx->cursor;
231 /* here data is packed in BE */
232
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 3 switch (cursor_fmt) {
233 2 case CUR_FMT_MONO:
234
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 66 for (j = 0; j < ctx->cursor_h; j++) {
235
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 128 for (i = 0; i < ctx->cursor_w; i += 32) {
236 64 uint32_t bits = bytestream2_get_be32(&ctx->gbc);
237
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 2112 for (k = 0; k < 32; k++) {
238 2048 dst[0] = !!(bits & 0x80000000);
239 2048 dst += 4;
240 2048 bits <<= 1;
241 }
242 }
243 64 dst += ctx->cursor_stride - ctx->cursor_w * 4;
244 }
245
246 2 dst = ctx->cursor;
247
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 66 for (j = 0; j < ctx->cursor_h; j++) {
248
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 128 for (i = 0; i < ctx->cursor_w; i += 32) {
249 64 uint32_t bits = bytestream2_get_be32(&ctx->gbc);
250
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 2112 for (k = 0; k < 32; k++) {
251 2048 int mask_bit = !!(bits & 0x80000000);
252
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 2048 switch (dst[0] * 2 + mask_bit) {
253 104 case 0:
254 104 dst[0] = 0xFF;
255 104 dst[1] = 0x00;
256 104 dst[2] = 0x00;
257 104 dst[3] = 0x00;
258 104 break;
259 178 case 1:
260 178 dst[0] = 0xFF;
261 178 dst[1] = 0xFF;
262 178 dst[2] = 0xFF;
263 178 dst[3] = 0xFF;
264 178 break;
265 1766 default:
266 1766 dst[0] = 0x00;
267 1766 dst[1] = 0x00;
268 1766 dst[2] = 0x00;
269 1766 dst[3] = 0x00;
270 }
271 2048 dst += 4;
272 2048 bits <<= 1;
273 }
274 }
275 64 dst += ctx->cursor_stride - ctx->cursor_w * 4;
276 }
277 2 break;
278 1 case CUR_FMT_BGRA:
279 case CUR_FMT_RGBA:
280 /* Skip monochrome version of the cursor */
281 1 bytestream2_skip(&ctx->gbc,
282 1 ctx->cursor_h * (FFALIGN(ctx->cursor_w, 32) >> 3));
283
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 1 if (cursor_fmt & 8) { // RGBA -> ABGR
284
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 40 for (j = 0; j < ctx->cursor_h; j++) {
285
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 1638 for (i = 0; i < ctx->cursor_w; i++) {
286 1599 int val = bytestream2_get_be32(&ctx->gbc);
287 1599 *dst++ = val >> 24;
288 1599 *dst++ = val >> 16;
289 1599 *dst++ = val >> 8;
290 1599 *dst++ = val >> 0;
291 }
292 39 dst += ctx->cursor_stride - ctx->cursor_w * 4;
293 }
294 } else { // BGRA -> ABGR
295 ✗ for (j = 0; j < ctx->cursor_h; j++) {
296 ✗ for (i = 0; i < ctx->cursor_w; i++) {
297 ✗ int val = bytestream2_get_be32(&ctx->gbc);
298 ✗ *dst++ = val >> 0;
299 ✗ *dst++ = val >> 24;
300 ✗ *dst++ = val >> 16;
301 ✗ *dst++ = val >> 8;
302 }
303 ✗ dst += ctx->cursor_stride - ctx->cursor_w * 4;
304 }
305 }
306 1 break;
307 ✗ default:
308 ✗ avpriv_request_sample(avctx, "Cursor format %08x", cursor_fmt);
309 ✗ return AVERROR_PATCHWELCOME;
310 }
311
312 3 return 0;
313 }
314
315 /* Convert a single YUV pixel to RGB. */
316 1231360 static inline void tdsc_yuv2rgb(uint8_t *out, int Y, int U, int V)
317 {
318 1231360 out[0] = av_clip_uint8(Y + ( 91881 * V + 32768 >> 16));
319 1231360 out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
320 1231360 out[2] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
321 1231360 }
322
323 /* Convert a YUV420 buffer to a RGB buffer. */
324 273 static av_always_inline void tdsc_blit(uint8_t *dst, int dst_stride,
325 const uint8_t *srcy, int srcy_stride,
326 const uint8_t *srcu, const uint8_t *srcv,
327 int srcuv_stride, int width, int height)
328 {
329 int col, line;
330
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 8305 for (line = 0; line < height; line++) {
331
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 1239392 for (col = 0; col < width; col++)
332 1231360 tdsc_yuv2rgb(dst + col * 3, srcy[col],
333 1231360 srcu[col >> 1] - 128, srcv[col >> 1] - 128);
334
335 8032 dst += dst_stride;
336 8032 srcy += srcy_stride;
337 8032 srcu += srcuv_stride * (line & 1);
338 8032 srcv += srcuv_stride * (line & 1);
339 }
340 273 }
341
342 /* Invoke the MJPEG decoder to decode the tile. */
343 273 static int tdsc_decode_jpeg_tile(AVCodecContext *avctx, int tile_size,
344 int x, int y, int w, int h)
345 {
346 273 TDSCContext *ctx = avctx->priv_data;
347 int ret;
348
349 /* Prepare a packet and send to the MJPEG decoder */
350 273 av_packet_unref(ctx->jpkt);
351 273 ctx->jpkt->data = ctx->tilebuffer;
352 273 ctx->jpkt->size = tile_size;
353
354 273 ret = avcodec_send_packet(ctx->jpeg_avctx, ctx->jpkt);
355
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 273 if (ret < 0) {
356 ✗ av_log(avctx, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
357 ✗ return ret;
358 }
359
360 273 ret = avcodec_receive_frame(ctx->jpeg_avctx, ctx->jpgframe);
361
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 273 if (ret < 0 || ctx->jpgframe->format != AV_PIX_FMT_YUVJ420P) {
362 ✗ av_log(avctx, AV_LOG_ERROR,
363 "JPEG decoding error (%d).\n", ret);
364
365 /* Normally skip, error if explode */
366 ✗ if (avctx->err_recognition & AV_EF_EXPLODE)
367 ✗ return AVERROR_INVALIDDATA;
368 else
369 ✗ return 0;
370 }
371
372 /* Let's paint onto the buffer */
373 273 tdsc_blit(ctx->refframe->data[0] + x * 3 + ctx->refframe->linesize[0] * y,
374 273 ctx->refframe->linesize[0],
375 273 ctx->jpgframe->data[0], ctx->jpgframe->linesize[0],
376 273 ctx->jpgframe->data[1], ctx->jpgframe->data[2],
377 273 ctx->jpgframe->linesize[1], w, h);
378
379 273 av_frame_unref(ctx->jpgframe);
380
381 273 return 0;
382 }
383
384 /* Parse frame and either copy data or decode JPEG. */
385 36 static int tdsc_decode_tiles(AVCodecContext *avctx, int number_tiles)
386 {
387 36 TDSCContext *ctx = avctx->priv_data;
388 int i;
389
390 /* Iterate over the number of tiles */
391
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 598 for (i = 0; i < number_tiles; i++) {
392 int tile_size;
393 int tile_mode;
394 int x, y, x2, y2, w, h;
395 int ret;
396
397
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 1124 if (bytestream2_get_bytes_left(&ctx->gbc) < 4 ||
398
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 1124 bytestream2_get_le32(&ctx->gbc) != MKTAG('T','D','S','B') ||
399 562 bytestream2_get_bytes_left(&ctx->gbc) < TDSB_HEADER_SIZE - 4) {
400 ✗ av_log(avctx, AV_LOG_ERROR, "TDSB tag is too small.\n");
401 ✗ return AVERROR_INVALIDDATA;
402 }
403
404 562 tile_size = bytestream2_get_le32(&ctx->gbc);
405
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 562 if (bytestream2_get_bytes_left(&ctx->gbc) < tile_size)
406 ✗ return AVERROR_INVALIDDATA;
407
408 562 tile_mode = bytestream2_get_le32(&ctx->gbc);
409 562 bytestream2_skip(&ctx->gbc, 4); // unknown
410 562 x = bytestream2_get_le32(&ctx->gbc);
411 562 y = bytestream2_get_le32(&ctx->gbc);
412 562 x2 = bytestream2_get_le32(&ctx->gbc);
413 562 y2 = bytestream2_get_le32(&ctx->gbc);
414
415
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 562 if (x < 0 || y < 0 || x2 <= x || y2 <= y ||
416
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 562 x2 > ctx->width || y2 > ctx->height
417 ) {
418 ✗ av_log(avctx, AV_LOG_ERROR,
419 "Invalid tile position (%d.%d %d.%d outside %dx%d).\n",
420 x, y, x2, y2, ctx->width, ctx->height);
421 ✗ return AVERROR_INVALIDDATA;
422 }
423 562 w = x2 - x;
424 562 h = y2 - y;
425
426 562 ret = av_reallocp(&ctx->tilebuffer, tile_size);
427
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 562 if (!ctx->tilebuffer)
428 ✗ return ret;
429
430 562 bytestream2_get_buffer(&ctx->gbc, ctx->tilebuffer, tile_size);
431
432
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 562 if (tile_mode == MKTAG('G','E','P','J')) {
433 /* Decode JPEG tile and copy it in the reference frame */
434 273 ret = tdsc_decode_jpeg_tile(avctx, tile_size, x, y, w, h);
435
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 273 if (ret < 0)
436 ✗ return ret;
437
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 289 } else if (tile_mode == MKTAG(' ','W','A','R')) {
438 /* Just copy the buffer to output */
439 289 av_image_copy_plane(ctx->refframe->data[0] + x * 3 +
440 289 ctx->refframe->linesize[0] * y,
441 289 ctx->refframe->linesize[0], ctx->tilebuffer,
442 w * 3, w * 3, h);
443 } else {
444 ✗ av_log(avctx, AV_LOG_ERROR, "Unknown tile type %08x.\n", tile_mode);
445 ✗ return AVERROR_INVALIDDATA;
446 }
447 562 av_log(avctx, AV_LOG_DEBUG, "Tile %d, %dx%d (%d.%d)\n", i, w, h, x, y);
448 }
449
450 36 return 0;
451 }
452
453 36 static int tdsc_parse_tdsf(AVCodecContext *avctx, int number_tiles)
454 {
455 36 TDSCContext *ctx = avctx->priv_data;
456 36 int ret, w, h, init_refframe = !ctx->refframe->data[0];
457
458 /* BITMAPINFOHEADER
459 * http://msdn.microsoft.com/en-us/library/windows/desktop/dd183376.aspx */
460
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 36 if (bytestream2_get_le32(&ctx->gbc) != BITMAPINFOHEADER_SIZE)
461 ✗ return AVERROR_INVALIDDATA;
462
463 /* Store size, but wait for context reinit before updating avctx */
464 36 w = bytestream2_get_le32(&ctx->gbc);
465 36 h = -bytestream2_get_le32(&ctx->gbc);
466
467
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 72 if (bytestream2_get_le16(&ctx->gbc) != 1 || // 1 plane
468 36 bytestream2_get_le16(&ctx->gbc) != 24) // BGR24
469 ✗ return AVERROR_INVALIDDATA;
470
471 36 bytestream2_skip(&ctx->gbc, 24); // unused fields
472
473 /* Update sizes */
474
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 36 if (avctx->width != w || avctx->height != h) {
475 ✗ av_log(avctx, AV_LOG_DEBUG, "Size update %dx%d -> %d%d.\n",
476 avctx->width, avctx->height, ctx->width, ctx->height);
477 ✗ ret = ff_set_dimensions(avctx, w, h);
478 ✗ if (ret < 0)
479 ✗ return ret;
480 ✗ init_refframe = 1;
481 }
482 36 ctx->refframe->width = ctx->width = w;
483 36 ctx->refframe->height = ctx->height = h;
484
485 /* Allocate the reference frame if not already done or on size change */
486
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 36 if (init_refframe) {
487 1 ret = av_frame_get_buffer(ctx->refframe, 0);
488
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 1 if (ret < 0)
489 ✗ return ret;
490 }
491
492 /* Decode all tiles in a frame */
493 36 return tdsc_decode_tiles(avctx, number_tiles);
494 }
495
496 34 static int tdsc_parse_dtsm(AVCodecContext *avctx)
497 {
498 34 TDSCContext *ctx = avctx->priv_data;
499 int ret;
500 34 int action = bytestream2_get_le32(&ctx->gbc);
501
502 34 bytestream2_skip(&ctx->gbc, 4); // some kind of ID or version maybe?
503
504
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 34 if (action == 2 || action == 3) {
505 /* Load cursor coordinates */
506 34 ctx->cursor_x = bytestream2_get_le32(&ctx->gbc);
507 34 ctx->cursor_y = bytestream2_get_le32(&ctx->gbc);
508
509 /* Load a full cursor sprite */
510
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 34 if (action == 3) {
511 3 ret = tdsc_load_cursor(avctx);
512 /* Do not consider cursor errors fatal unless in explode mode */
513
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 3 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
514 ✗ return ret;
515 }
516 } else {
517 ✗ avpriv_request_sample(avctx, "Cursor action %d", action);
518 }
519
520 34 return 0;
521 }
522
523 42 static int tdsc_decode_frame(AVCodecContext *avctx, AVFrame *frame,
524 int *got_frame, AVPacket *avpkt)
525 {
526 42 TDSCContext *ctx = avctx->priv_data;
527 42 int ret, tag_header, keyframe = 0;
528 uLongf dlen;
529
530 /* Resize deflate buffer on resolution change */
531
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 42 if (ctx->width != avctx->width || ctx->height != avctx->height) {
532 1 int deflatelen = avctx->width * avctx->height * (3 + 1);
533
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 1 if (deflatelen != ctx->deflatelen) {
534 ✗ ctx->deflatelen =deflatelen;
535 ✗ ret = av_reallocp(&ctx->deflatebuffer, ctx->deflatelen);
536 ✗ if (ret < 0) {
537 ✗ ctx->deflatelen = 0;
538 ✗ return ret;
539 }
540 }
541 }
542 42 dlen = ctx->deflatelen;
543
544 /* Frames are deflated, need to inflate them first */
545 42 ret = uncompress(ctx->deflatebuffer, &dlen, avpkt->data, avpkt->size);
546
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 42 if (ret) {
547 1 av_log(avctx, AV_LOG_ERROR, "Deflate error %d.\n", ret);
548 1 return AVERROR_UNKNOWN;
549 }
550
551 41 bytestream2_init(&ctx->gbc, ctx->deflatebuffer, dlen);
552
553 /* Check for tag and for size info */
554
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 41 if (bytestream2_get_bytes_left(&ctx->gbc) < 4 + 4) {
555 ✗ av_log(avctx, AV_LOG_ERROR, "Frame is too small.\n");
556 ✗ return AVERROR_INVALIDDATA;
557 }
558
559 /* Read tag */
560 41 tag_header = bytestream2_get_le32(&ctx->gbc);
561
562
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 41 if (tag_header == MKTAG('T','D','S','F')) {
563 int number_tiles;
564
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 36 if (bytestream2_get_bytes_left(&ctx->gbc) < TDSF_HEADER_SIZE) {
565 ✗ av_log(avctx, AV_LOG_ERROR, "TDSF tag is too small.\n");
566 ✗ return AVERROR_INVALIDDATA;
567 }
568 /* First 4 bytes here are the number of GEPJ/WAR tiles in this frame */
569 36 number_tiles = bytestream2_get_le32(&ctx->gbc);
570
571 36 bytestream2_skip(&ctx->gbc, 4); // internal timestamp maybe?
572 36 keyframe = bytestream2_get_le32(&ctx->gbc) == 0x30;
573
574 36 ret = tdsc_parse_tdsf(avctx, number_tiles);
575
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 36 if (ret < 0)
576 ✗ return ret;
577
578 /* Check if there is anything else we are able to parse */
579
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 36 if (bytestream2_get_bytes_left(&ctx->gbc) >= 4 + 4)
580 31 tag_header = bytestream2_get_le32(&ctx->gbc);
581 }
582
583 /* This tag can be after a TDSF block or on its own frame */
584
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 41 if (tag_header == MKTAG('D','T','S','M')) {
585 /* First 4 bytes here are the total size in bytes for this frame */
586 34 int tag_size = bytestream2_get_le32(&ctx->gbc);
587
588
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 34 if (bytestream2_get_bytes_left(&ctx->gbc) < tag_size) {
589 ✗ av_log(avctx, AV_LOG_ERROR, "DTSM tag is too small.\n");
590 ✗ return AVERROR_INVALIDDATA;
591 }
592
593 34 ret = tdsc_parse_dtsm(avctx);
594
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 34 if (ret < 0)
595 ✗ return ret;
596 }
597
598 /* Get the output frame and copy the reference frame */
599 41 ret = ff_get_buffer(avctx, frame, 0);
600
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 41 if (ret < 0)
601 ✗ return ret;
602
603 41 ret = av_frame_copy(frame, ctx->refframe);
604
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 41 if (ret < 0)
605 ✗ return ret;
606
607 /* Paint the cursor on the output frame */
608 41 tdsc_paint_cursor(avctx, frame->data[0], frame->linesize[0]);
609
610 /* Frame is ready to be output */
611
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 41 if (keyframe) {
612 2 frame->pict_type = AV_PICTURE_TYPE_I;
613 2 frame->flags |= AV_FRAME_FLAG_KEY;
614 } else {
615 39 frame->pict_type = AV_PICTURE_TYPE_P;
616 }
617 41 *got_frame = 1;
618
619 41 return avpkt->size;
620 }
621
622 const FFCodec ff_tdsc_decoder = {
623 .p.name = "tdsc",
624 CODEC_LONG_NAME("TDSC"),
625 .p.type = AVMEDIA_TYPE_VIDEO,
626 .p.id = AV_CODEC_ID_TDSC,
627 .init = tdsc_init,
628 FF_CODEC_DECODE_CB(tdsc_decode_frame),
629 .close = tdsc_close,
630 .priv_data_size = sizeof(TDSCContext),
631 .p.capabilities = AV_CODEC_CAP_DR1,
632 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
633 };
634