FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/tdsc.c
Date: 2026-05-02 21:46:34
Exec Total Coverage
Lines: 251 325 77.2%
Functions: 11 11 100.0%
Branches: 113 190 59.5%
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
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 273 w > ctx->jpgframe->width || h > ctx->jpgframe->height) {
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
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 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
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 1124 if (bytestream2_get_bytes_left(&ctx->gbc) < 4 ||
399
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 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
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 562 if (bytestream2_get_bytes_left(&ctx->gbc) < tile_size + 24LL)
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
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 562 if (x < 0 || y < 0 || x2 <= x || y2 <= y ||
417
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 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
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 562 if (!ctx->tilebuffer)
429 ✗ return ret;
430
431 562 bytestream2_get_buffer(&ctx->gbc, ctx->tilebuffer, tile_size);
432
433
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 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
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 273 if (ret < 0)
437 ✗ return ret;
438
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 289 } else if (tile_mode == MKTAG(' ','W','A','R')) {
439
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 289 if (3LL * w * h > tile_size)
440 ✗ return AVERROR_INVALIDDATA;
441
442 /* Just copy the buffer to output */
443 289 av_image_copy_plane(ctx->refframe->data[0] + x * 3 +
444 289 ctx->refframe->linesize[0] * y,
445 289 ctx->refframe->linesize[0], ctx->tilebuffer,
446 w * 3, w * 3, h);
447 } else {
448 ✗ av_log(avctx, AV_LOG_ERROR, "Unknown tile type %08x.\n", tile_mode);
449 ✗ return AVERROR_INVALIDDATA;
450 }
451 562 av_log(avctx, AV_LOG_DEBUG, "Tile %d, %dx%d (%d.%d)\n", i, w, h, x, y);
452 }
453
454 36 return 0;
455 }
456
457 36 static int tdsc_parse_tdsf(AVCodecContext *avctx, int number_tiles)
458 {
459 36 TDSCContext *ctx = avctx->priv_data;
460 36 int ret, w, h, init_refframe = !ctx->refframe->data[0];
461
462 /* BITMAPINFOHEADER
463 * http://msdn.microsoft.com/en-us/library/windows/desktop/dd183376.aspx */
464
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 36 if (bytestream2_get_le32(&ctx->gbc) != BITMAPINFOHEADER_SIZE)
465 ✗ return AVERROR_INVALIDDATA;
466
467 /* Store size, but wait for context reinit before updating avctx */
468 36 w = bytestream2_get_le32(&ctx->gbc);
469 36 h = -bytestream2_get_le32(&ctx->gbc);
470
471
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 72 if (bytestream2_get_le16(&ctx->gbc) != 1 || // 1 plane
472 36 bytestream2_get_le16(&ctx->gbc) != 24) // BGR24
473 ✗ return AVERROR_INVALIDDATA;
474
475 36 bytestream2_skip(&ctx->gbc, 24); // unused fields
476
477 /* Update sizes */
478
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 36 if (avctx->width != w || avctx->height != h) {
479 ✗ av_log(avctx, AV_LOG_DEBUG, "Size update %dx%d -> %d%d.\n",
480 avctx->width, avctx->height, ctx->width, ctx->height);
481 ✗ ret = ff_set_dimensions(avctx, w, h);
482 ✗ if (ret < 0)
483 ✗ return ret;
484 ✗ init_refframe = 1;
485 }
486 36 ctx->refframe->width = ctx->width = w;
487 36 ctx->refframe->height = ctx->height = h;
488
489 /* Allocate the reference frame if not already done or on size change */
490
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 36 if (init_refframe) {
491 1 ret = av_frame_get_buffer(ctx->refframe, 0);
492
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 1 if (ret < 0)
493 ✗ return ret;
494 }
495
496 /* Decode all tiles in a frame */
497 36 return tdsc_decode_tiles(avctx, number_tiles);
498 }
499
500 34 static int tdsc_parse_dtsm(AVCodecContext *avctx)
501 {
502 34 TDSCContext *ctx = avctx->priv_data;
503 int ret;
504 34 int action = bytestream2_get_le32(&ctx->gbc);
505
506 34 bytestream2_skip(&ctx->gbc, 4); // some kind of ID or version maybe?
507
508
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 34 if (action == 2 || action == 3) {
509 /* Load cursor coordinates */
510 34 ctx->cursor_x = bytestream2_get_le32(&ctx->gbc);
511 34 ctx->cursor_y = bytestream2_get_le32(&ctx->gbc);
512
513 /* Load a full cursor sprite */
514
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 34 if (action == 3) {
515 3 ret = tdsc_load_cursor(avctx);
516 /* Do not consider cursor errors fatal unless in explode mode */
517
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 3 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
518 ✗ return ret;
519 }
520 } else {
521 ✗ avpriv_request_sample(avctx, "Cursor action %d", action);
522 }
523
524 34 return 0;
525 }
526
527 42 static int tdsc_decode_frame(AVCodecContext *avctx, AVFrame *frame,
528 int *got_frame, AVPacket *avpkt)
529 {
530 42 TDSCContext *ctx = avctx->priv_data;
531 42 int ret, tag_header, keyframe = 0;
532 uLongf dlen;
533
534 /* Resize deflate buffer on resolution change */
535
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 42 if (ctx->width != avctx->width || ctx->height != avctx->height) {
536 1 int deflatelen = avctx->width * avctx->height * (3 + 1);
537
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 1 if (deflatelen != ctx->deflatelen) {
538 ✗ ctx->deflatelen =deflatelen;
539 ✗ ret = av_reallocp(&ctx->deflatebuffer, ctx->deflatelen);
540 ✗ if (ret < 0) {
541 ✗ ctx->deflatelen = 0;
542 ✗ return ret;
543 }
544 }
545 }
546 42 dlen = ctx->deflatelen;
547
548 /* Frames are deflated, need to inflate them first */
549 42 ret = uncompress(ctx->deflatebuffer, &dlen, avpkt->data, avpkt->size);
550
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 42 if (ret != Z_OK) {
551 1 av_log(avctx, AV_LOG_ERROR, "Deflate error %d.\n", ret);
552 1 return AVERROR_UNKNOWN;
553 }
554
555 41 bytestream2_init(&ctx->gbc, ctx->deflatebuffer, dlen);
556
557 /* Check for tag and for size info */
558
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 41 if (bytestream2_get_bytes_left(&ctx->gbc) < 4 + 4) {
559 ✗ av_log(avctx, AV_LOG_ERROR, "Frame is too small.\n");
560 ✗ return AVERROR_INVALIDDATA;
561 }
562
563 /* Read tag */
564 41 tag_header = bytestream2_get_le32(&ctx->gbc);
565
566
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 41 if (tag_header == MKTAG('T','D','S','F')) {
567 int number_tiles;
568
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 36 if (bytestream2_get_bytes_left(&ctx->gbc) < TDSF_HEADER_SIZE) {
569 ✗ av_log(avctx, AV_LOG_ERROR, "TDSF tag is too small.\n");
570 ✗ return AVERROR_INVALIDDATA;
571 }
572 /* First 4 bytes here are the number of GEPJ/WAR tiles in this frame */
573 36 number_tiles = bytestream2_get_le32(&ctx->gbc);
574
575 36 bytestream2_skip(&ctx->gbc, 4); // internal timestamp maybe?
576 36 keyframe = bytestream2_get_le32(&ctx->gbc) == 0x30;
577
578 36 ret = tdsc_parse_tdsf(avctx, number_tiles);
579
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 36 if (ret < 0)
580 ✗ return ret;
581
582 /* Check if there is anything else we are able to parse */
583
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 36 if (bytestream2_get_bytes_left(&ctx->gbc) >= 4 + 4)
584 31 tag_header = bytestream2_get_le32(&ctx->gbc);
585 }
586
587 /* This tag can be after a TDSF block or on its own frame */
588
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 41 if (tag_header == MKTAG('D','T','S','M')) {
589 /* First 4 bytes here are the total size in bytes for this frame */
590 34 int tag_size = bytestream2_get_le32(&ctx->gbc);
591
592
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 34 if (bytestream2_get_bytes_left(&ctx->gbc) < tag_size) {
593 ✗ av_log(avctx, AV_LOG_ERROR, "DTSM tag is too small.\n");
594 ✗ return AVERROR_INVALIDDATA;
595 }
596
597 34 ret = tdsc_parse_dtsm(avctx);
598
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 34 if (ret < 0)
599 ✗ return ret;
600 }
601
602 /* Get the output frame and copy the reference frame */
603 41 ret = ff_get_buffer(avctx, frame, 0);
604
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 41 if (ret < 0)
605 ✗ return ret;
606
607 41 ret = av_frame_copy(frame, ctx->refframe);
608
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 41 if (ret < 0)
609 ✗ return ret;
610
611 /* Paint the cursor on the output frame */
612 41 tdsc_paint_cursor(avctx, frame->data[0], frame->linesize[0]);
613
614 /* Frame is ready to be output */
615
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 41 if (keyframe) {
616 2 frame->pict_type = AV_PICTURE_TYPE_I;
617 2 frame->flags |= AV_FRAME_FLAG_KEY;
618 } else {
619 39 frame->pict_type = AV_PICTURE_TYPE_P;
620 }
621 41 *got_frame = 1;
622
623 41 return avpkt->size;
624 }
625
626 const FFCodec ff_tdsc_decoder = {
627 .p.name = "tdsc",
628 CODEC_LONG_NAME("TDSC"),
629 .p.type = AVMEDIA_TYPE_VIDEO,
630 .p.id = AV_CODEC_ID_TDSC,
631 .init = tdsc_init,
632 FF_CODEC_DECODE_CB(tdsc_decode_frame),
633 .close = tdsc_close,
634 .priv_data_size = sizeof(TDSCContext),
635 .p.capabilities = AV_CODEC_CAP_DR1,
636 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
637 };
638