FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/tdsc.c
Date: 2024-04-24 18:52:15
Exec Total Coverage
Lines: 251 325 77.2%
Functions: 11 11 100.0%
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 #include "libavutil/mem.h"
41
42 #include "avcodec.h"
43 #include "bytestream.h"
44 #include "codec_internal.h"
45 #include "decode.h"
46
47 #define BITMAPINFOHEADER_SIZE 0x28
48 #define TDSF_HEADER_SIZE 0x56
49 #define TDSB_HEADER_SIZE 0x08
50
51 typedef struct TDSCContext {
52 AVCodecContext *jpeg_avctx; // wrapper context for MJPEG
53
54 int width, height;
55 GetByteContext gbc;
56
57 AVFrame *refframe; // full decoded frame (without cursor)
58 AVPacket *jpkt; // encoded JPEG tile
59 AVFrame *jpgframe; // decoded JPEG tile
60 uint8_t *tilebuffer; // buffer containing tile data
61
62 /* zlib interaction */
63 uint8_t *deflatebuffer;
64 uLongf deflatelen;
65
66 /* All that is cursor */
67 uint8_t *cursor;
68 int cursor_stride;
69 int cursor_w, cursor_h, cursor_x, cursor_y;
70 int cursor_hot_x, cursor_hot_y;
71 } TDSCContext;
72
73 /* 1 byte bits, 1 byte planes, 2 bytes format (probably) */
74 enum TDSCCursorFormat {
75 CUR_FMT_MONO = 0x01010004,
76 CUR_FMT_BGRA = 0x20010004,
77 CUR_FMT_RGBA = 0x20010008,
78 };
79
80 2 static av_cold int tdsc_close(AVCodecContext *avctx)
81 {
82 2 TDSCContext *ctx = avctx->priv_data;
83
84 2 av_frame_free(&ctx->refframe);
85 2 av_frame_free(&ctx->jpgframe);
86 2 av_packet_free(&ctx->jpkt);
87 2 av_freep(&ctx->deflatebuffer);
88 2 av_freep(&ctx->tilebuffer);
89 2 av_freep(&ctx->cursor);
90 2 avcodec_free_context(&ctx->jpeg_avctx);
91
92 2 return 0;
93 }
94
95 2 static av_cold int tdsc_init(AVCodecContext *avctx)
96 {
97 2 TDSCContext *ctx = avctx->priv_data;
98 const AVCodec *codec;
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 2 codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG);
124
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 2 if (!codec)
125 ✗ return AVERROR_BUG;
126 2 ctx->jpeg_avctx = avcodec_alloc_context3(codec);
127
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 2 if (!ctx->jpeg_avctx)
128 ✗ return AVERROR(ENOMEM);
129 2 ctx->jpeg_avctx->flags = avctx->flags;
130 2 ctx->jpeg_avctx->flags2 = avctx->flags2;
131 2 ctx->jpeg_avctx->idct_algo = avctx->idct_algo;
132 2 ret = avcodec_open2(ctx->jpeg_avctx, codec, NULL);
133
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 2 if (ret < 0)
134 ✗ return ret;
135
136 /* Set the output pixel format on the reference frame */
137 2 ctx->refframe->format = avctx->pix_fmt;
138
139 2 return 0;
140 }
141
142 #define APPLY_ALPHA(src, new, alpha) \
143 src = (src * (256 - alpha) + new * alpha) >> 8
144
145 /* Paint a region over a buffer, without drawing out of its bounds. */
146 41 static void tdsc_paint_cursor(AVCodecContext *avctx, uint8_t *dst, int stride)
147 {
148 41 TDSCContext *ctx = avctx->priv_data;
149 41 const uint8_t *cursor = ctx->cursor;
150 41 int x = ctx->cursor_x - ctx->cursor_hot_x;
151 41 int y = ctx->cursor_y - ctx->cursor_hot_y;
152 41 int w = ctx->cursor_w;
153 41 int h = ctx->cursor_h;
154 int i, j;
155
156
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 41 if (!ctx->cursor)
157 17 return;
158
159
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 24 if (x + w > ctx->width)
160 ✗ w = ctx->width - x;
161
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 24 if (y + h > ctx->height)
162 ✗ h = ctx->height - y;
163
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 24 if (x < 0) {
164 ✗ w += x;
165 ✗ cursor += -x * 4;
166 } else {
167 24 dst += x * 3;
168 }
169
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 24 if (y < 0) {
170 ✗ h += y;
171 ✗ cursor += -y * ctx->cursor_stride;
172 } else {
173 24 dst += y * stride;
174 }
175
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 24 if (w < 0 || h < 0)
176 ✗ return;
177
178
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 799 for (j = 0; j < h; j++) {
179
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 25926 for (i = 0; i < w; i++) {
180 25151 uint8_t alpha = cursor[i * 4];
181 25151 APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
182 25151 APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
183 25151 APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
184 }
185 775 dst += stride;
186 775 cursor += ctx->cursor_stride;
187 }
188 }
189
190 /* Load cursor data and store it in ABGR mode. */
191 3 static int tdsc_load_cursor(AVCodecContext *avctx)
192 {
193 3 TDSCContext *ctx = avctx->priv_data;
194 int i, j, k, ret, cursor_fmt;
195 uint8_t *dst;
196
197 3 ctx->cursor_hot_x = bytestream2_get_le16(&ctx->gbc);
198 3 ctx->cursor_hot_y = bytestream2_get_le16(&ctx->gbc);
199 3 ctx->cursor_w = bytestream2_get_le16(&ctx->gbc);
200 3 ctx->cursor_h = bytestream2_get_le16(&ctx->gbc);
201
202 3 ctx->cursor_stride = FFALIGN(ctx->cursor_w, 32) * 4;
203 3 cursor_fmt = bytestream2_get_le32(&ctx->gbc);
204
205
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 3 if (ctx->cursor_x >= avctx->width || ctx->cursor_y >= avctx->height) {
206 ✗ av_log(avctx, AV_LOG_ERROR,
207 "Invalid cursor position (%d.%d outside %dx%d).\n",
208 ctx->cursor_x, ctx->cursor_y, avctx->width, avctx->height);
209 ✗ return AVERROR_INVALIDDATA;
210 }
211
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 3 if (ctx->cursor_w < 1 || ctx->cursor_w > 256 ||
212
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 3 ctx->cursor_h < 1 || ctx->cursor_h > 256) {
213 ✗ av_log(avctx, AV_LOG_ERROR,
214 "Invalid cursor dimensions %dx%d.\n",
215 ctx->cursor_w, ctx->cursor_h);
216 ✗ return AVERROR_INVALIDDATA;
217 }
218
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 3 if (ctx->cursor_hot_x > ctx->cursor_w ||
219
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 3 ctx->cursor_hot_y > ctx->cursor_h) {
220 ✗ av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %d.%d.\n",
221 ctx->cursor_hot_x, ctx->cursor_hot_y);
222 ✗ ctx->cursor_hot_x = FFMIN(ctx->cursor_hot_x, ctx->cursor_w - 1);
223 ✗ ctx->cursor_hot_y = FFMIN(ctx->cursor_hot_y, ctx->cursor_h - 1);
224 }
225
226 3 ret = av_reallocp(&ctx->cursor, ctx->cursor_stride * ctx->cursor_h);
227
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 3 if (ret < 0) {
228 ✗ av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer.\n");
229 ✗ return ret;
230 }
231
232 3 dst = ctx->cursor;
233 /* here data is packed in BE */
234
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 3 switch (cursor_fmt) {
235 2 case CUR_FMT_MONO:
236
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 66 for (j = 0; j < ctx->cursor_h; j++) {
237
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 128 for (i = 0; i < ctx->cursor_w; i += 32) {
238 64 uint32_t bits = bytestream2_get_be32(&ctx->gbc);
239
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 2112 for (k = 0; k < 32; k++) {
240 2048 dst[0] = !!(bits & 0x80000000);
241 2048 dst += 4;
242 2048 bits <<= 1;
243 }
244 }
245 64 dst += ctx->cursor_stride - ctx->cursor_w * 4;
246 }
247
248 2 dst = ctx->cursor;
249
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 66 for (j = 0; j < ctx->cursor_h; j++) {
250
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 128 for (i = 0; i < ctx->cursor_w; i += 32) {
251 64 uint32_t bits = bytestream2_get_be32(&ctx->gbc);
252
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 2112 for (k = 0; k < 32; k++) {
253 2048 int mask_bit = !!(bits & 0x80000000);
254
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 2048 switch (dst[0] * 2 + mask_bit) {
255 104 case 0:
256 104 dst[0] = 0xFF;
257 104 dst[1] = 0x00;
258 104 dst[2] = 0x00;
259 104 dst[3] = 0x00;
260 104 break;
261 178 case 1:
262 178 dst[0] = 0xFF;
263 178 dst[1] = 0xFF;
264 178 dst[2] = 0xFF;
265 178 dst[3] = 0xFF;
266 178 break;
267 1766 default:
268 1766 dst[0] = 0x00;
269 1766 dst[1] = 0x00;
270 1766 dst[2] = 0x00;
271 1766 dst[3] = 0x00;
272 }
273 2048 dst += 4;
274 2048 bits <<= 1;
275 }
276 }
277 64 dst += ctx->cursor_stride - ctx->cursor_w * 4;
278 }
279 2 break;
280 1 case CUR_FMT_BGRA:
281 case CUR_FMT_RGBA:
282 /* Skip monochrome version of the cursor */
283 1 bytestream2_skip(&ctx->gbc,
284 1 ctx->cursor_h * (FFALIGN(ctx->cursor_w, 32) >> 3));
285
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 1 if (cursor_fmt & 8) { // RGBA -> ABGR
286
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 40 for (j = 0; j < ctx->cursor_h; j++) {
287
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 1638 for (i = 0; i < ctx->cursor_w; i++) {
288 1599 int val = bytestream2_get_be32(&ctx->gbc);
289 1599 *dst++ = val >> 24;
290 1599 *dst++ = val >> 16;
291 1599 *dst++ = val >> 8;
292 1599 *dst++ = val >> 0;
293 }
294 39 dst += ctx->cursor_stride - ctx->cursor_w * 4;
295 }
296 } else { // BGRA -> ABGR
297 ✗ for (j = 0; j < ctx->cursor_h; j++) {
298 ✗ for (i = 0; i < ctx->cursor_w; i++) {
299 ✗ int val = bytestream2_get_be32(&ctx->gbc);
300 ✗ *dst++ = val >> 0;
301 ✗ *dst++ = val >> 24;
302 ✗ *dst++ = val >> 16;
303 ✗ *dst++ = val >> 8;
304 }
305 ✗ dst += ctx->cursor_stride - ctx->cursor_w * 4;
306 }
307 }
308 1 break;
309 ✗ default:
310 ✗ avpriv_request_sample(avctx, "Cursor format %08x", cursor_fmt);
311 ✗ return AVERROR_PATCHWELCOME;
312 }
313
314 3 return 0;
315 }
316
317 /* Convert a single YUV pixel to RGB. */
318 1231360 static inline void tdsc_yuv2rgb(uint8_t *out, int Y, int U, int V)
319 {
320 1231360 out[0] = av_clip_uint8(Y + ( 91881 * V + 32768 >> 16));
321 1231360 out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
322 1231360 out[2] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
323 1231360 }
324
325 /* Convert a YUV420 buffer to a RGB buffer. */
326 273 static av_always_inline void tdsc_blit(uint8_t *dst, int dst_stride,
327 const uint8_t *srcy, int srcy_stride,
328 const uint8_t *srcu, const uint8_t *srcv,
329 int srcuv_stride, int width, int height)
330 {
331 int col, line;
332
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 8305 for (line = 0; line < height; line++) {
333
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 1239392 for (col = 0; col < width; col++)
334 1231360 tdsc_yuv2rgb(dst + col * 3, srcy[col],
335 1231360 srcu[col >> 1] - 128, srcv[col >> 1] - 128);
336
337 8032 dst += dst_stride;
338 8032 srcy += srcy_stride;
339 8032 srcu += srcuv_stride * (line & 1);
340 8032 srcv += srcuv_stride * (line & 1);
341 }
342 273 }
343
344 /* Invoke the MJPEG decoder to decode the tile. */
345 273 static int tdsc_decode_jpeg_tile(AVCodecContext *avctx, int tile_size,
346 int x, int y, int w, int h)
347 {
348 273 TDSCContext *ctx = avctx->priv_data;
349 int ret;
350
351 /* Prepare a packet and send to the MJPEG decoder */
352 273 av_packet_unref(ctx->jpkt);
353 273 ctx->jpkt->data = ctx->tilebuffer;
354 273 ctx->jpkt->size = tile_size;
355
356 273 ret = avcodec_send_packet(ctx->jpeg_avctx, ctx->jpkt);
357
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 273 if (ret < 0) {
358 ✗ av_log(avctx, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
359 ✗ return ret;
360 }
361
362 273 ret = avcodec_receive_frame(ctx->jpeg_avctx, ctx->jpgframe);
363
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 273 if (ret < 0 || ctx->jpgframe->format != AV_PIX_FMT_YUVJ420P) {
364 ✗ av_log(avctx, AV_LOG_ERROR,
365 "JPEG decoding error (%d).\n", ret);
366
367 /* Normally skip, error if explode */
368 ✗ if (avctx->err_recognition & AV_EF_EXPLODE)
369 ✗ return AVERROR_INVALIDDATA;
370 else
371 ✗ return 0;
372 }
373
374 /* Let's paint onto the buffer */
375 273 tdsc_blit(ctx->refframe->data[0] + x * 3 + ctx->refframe->linesize[0] * y,
376 273 ctx->refframe->linesize[0],
377 273 ctx->jpgframe->data[0], ctx->jpgframe->linesize[0],
378 273 ctx->jpgframe->data[1], ctx->jpgframe->data[2],
379 273 ctx->jpgframe->linesize[1], w, h);
380
381 273 av_frame_unref(ctx->jpgframe);
382
383 273 return 0;
384 }
385
386 /* Parse frame and either copy data or decode JPEG. */
387 36 static int tdsc_decode_tiles(AVCodecContext *avctx, int number_tiles)
388 {
389 36 TDSCContext *ctx = avctx->priv_data;
390 int i;
391
392 /* Iterate over the number of tiles */
393
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 598 for (i = 0; i < number_tiles; i++) {
394 int tile_size;
395 int tile_mode;
396 int x, y, x2, y2, w, h;
397 int ret;
398
399
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 1124 if (bytestream2_get_bytes_left(&ctx->gbc) < 4 ||
400
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 1124 bytestream2_get_le32(&ctx->gbc) != MKTAG('T','D','S','B') ||
401 562 bytestream2_get_bytes_left(&ctx->gbc) < TDSB_HEADER_SIZE - 4) {
402 ✗ av_log(avctx, AV_LOG_ERROR, "TDSB tag is too small.\n");
403 ✗ return AVERROR_INVALIDDATA;
404 }
405
406 562 tile_size = bytestream2_get_le32(&ctx->gbc);
407
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 562 if (bytestream2_get_bytes_left(&ctx->gbc) < tile_size)
408 ✗ return AVERROR_INVALIDDATA;
409
410 562 tile_mode = bytestream2_get_le32(&ctx->gbc);
411 562 bytestream2_skip(&ctx->gbc, 4); // unknown
412 562 x = bytestream2_get_le32(&ctx->gbc);
413 562 y = bytestream2_get_le32(&ctx->gbc);
414 562 x2 = bytestream2_get_le32(&ctx->gbc);
415 562 y2 = bytestream2_get_le32(&ctx->gbc);
416
417
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 562 if (x < 0 || y < 0 || x2 <= x || y2 <= y ||
418
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 562 x2 > ctx->width || y2 > ctx->height
419 ) {
420 ✗ av_log(avctx, AV_LOG_ERROR,
421 "Invalid tile position (%d.%d %d.%d outside %dx%d).\n",
422 x, y, x2, y2, ctx->width, ctx->height);
423 ✗ return AVERROR_INVALIDDATA;
424 }
425 562 w = x2 - x;
426 562 h = y2 - y;
427
428 562 ret = av_reallocp(&ctx->tilebuffer, tile_size);
429
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 562 if (!ctx->tilebuffer)
430 ✗ return ret;
431
432 562 bytestream2_get_buffer(&ctx->gbc, ctx->tilebuffer, tile_size);
433
434
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 562 if (tile_mode == MKTAG('G','E','P','J')) {
435 /* Decode JPEG tile and copy it in the reference frame */
436 273 ret = tdsc_decode_jpeg_tile(avctx, tile_size, x, y, w, h);
437
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 273 if (ret < 0)
438 ✗ return ret;
439
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 289 } else if (tile_mode == MKTAG(' ','W','A','R')) {
440 /* Just copy the buffer to output */
441 289 av_image_copy_plane(ctx->refframe->data[0] + x * 3 +
442 289 ctx->refframe->linesize[0] * y,
443 289 ctx->refframe->linesize[0], ctx->tilebuffer,
444 w * 3, w * 3, h);
445 } else {
446 ✗ av_log(avctx, AV_LOG_ERROR, "Unknown tile type %08x.\n", tile_mode);
447 ✗ return AVERROR_INVALIDDATA;
448 }
449 562 av_log(avctx, AV_LOG_DEBUG, "Tile %d, %dx%d (%d.%d)\n", i, w, h, x, y);
450 }
451
452 36 return 0;
453 }
454
455 36 static int tdsc_parse_tdsf(AVCodecContext *avctx, int number_tiles)
456 {
457 36 TDSCContext *ctx = avctx->priv_data;
458 36 int ret, w, h, init_refframe = !ctx->refframe->data[0];
459
460 /* BITMAPINFOHEADER
461 * http://msdn.microsoft.com/en-us/library/windows/desktop/dd183376.aspx */
462
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 36 if (bytestream2_get_le32(&ctx->gbc) != BITMAPINFOHEADER_SIZE)
463 ✗ return AVERROR_INVALIDDATA;
464
465 /* Store size, but wait for context reinit before updating avctx */
466 36 w = bytestream2_get_le32(&ctx->gbc);
467 36 h = -bytestream2_get_le32(&ctx->gbc);
468
469
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 72 if (bytestream2_get_le16(&ctx->gbc) != 1 || // 1 plane
470 36 bytestream2_get_le16(&ctx->gbc) != 24) // BGR24
471 ✗ return AVERROR_INVALIDDATA;
472
473 36 bytestream2_skip(&ctx->gbc, 24); // unused fields
474
475 /* Update sizes */
476
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 36 if (avctx->width != w || avctx->height != h) {
477 ✗ av_log(avctx, AV_LOG_DEBUG, "Size update %dx%d -> %d%d.\n",
478 avctx->width, avctx->height, ctx->width, ctx->height);
479 ✗ ret = ff_set_dimensions(avctx, w, h);
480 ✗ if (ret < 0)
481 ✗ return ret;
482 ✗ init_refframe = 1;
483 }
484 36 ctx->refframe->width = ctx->width = w;
485 36 ctx->refframe->height = ctx->height = h;
486
487 /* Allocate the reference frame if not already done or on size change */
488
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 36 if (init_refframe) {
489 1 ret = av_frame_get_buffer(ctx->refframe, 0);
490
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 1 if (ret < 0)
491 ✗ return ret;
492 }
493
494 /* Decode all tiles in a frame */
495 36 return tdsc_decode_tiles(avctx, number_tiles);
496 }
497
498 34 static int tdsc_parse_dtsm(AVCodecContext *avctx)
499 {
500 34 TDSCContext *ctx = avctx->priv_data;
501 int ret;
502 34 int action = bytestream2_get_le32(&ctx->gbc);
503
504 34 bytestream2_skip(&ctx->gbc, 4); // some kind of ID or version maybe?
505
506
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 34 if (action == 2 || action == 3) {
507 /* Load cursor coordinates */
508 34 ctx->cursor_x = bytestream2_get_le32(&ctx->gbc);
509 34 ctx->cursor_y = bytestream2_get_le32(&ctx->gbc);
510
511 /* Load a full cursor sprite */
512
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 34 if (action == 3) {
513 3 ret = tdsc_load_cursor(avctx);
514 /* Do not consider cursor errors fatal unless in explode mode */
515
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 3 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
516 ✗ return ret;
517 }
518 } else {
519 ✗ avpriv_request_sample(avctx, "Cursor action %d", action);
520 }
521
522 34 return 0;
523 }
524
525 42 static int tdsc_decode_frame(AVCodecContext *avctx, AVFrame *frame,
526 int *got_frame, AVPacket *avpkt)
527 {
528 42 TDSCContext *ctx = avctx->priv_data;
529 42 int ret, tag_header, keyframe = 0;
530 uLongf dlen;
531
532 /* Resize deflate buffer on resolution change */
533
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 42 if (ctx->width != avctx->width || ctx->height != avctx->height) {
534 1 int deflatelen = avctx->width * avctx->height * (3 + 1);
535
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 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
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 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
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 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
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 41 if (tag_header == MKTAG('T','D','S','F')) {
565 int number_tiles;
566
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 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
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 36 if (ret < 0)
578 ✗ return ret;
579
580 /* Check if there is anything else we are able to parse */
581
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 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
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 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
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 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
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 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
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 41 if (ret < 0)
603 ✗ return ret;
604
605 41 ret = av_frame_copy(frame, ctx->refframe);
606
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 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
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 41 if (keyframe) {
614 2 frame->pict_type = AV_PICTURE_TYPE_I;
615 2 frame->flags |= AV_FRAME_FLAG_KEY;
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 const FFCodec ff_tdsc_decoder = {
625 .p.name = "tdsc",
626 CODEC_LONG_NAME("TDSC"),
627 .p.type = AVMEDIA_TYPE_VIDEO,
628 .p.id = AV_CODEC_ID_TDSC,
629 .init = tdsc_init,
630 FF_CODEC_DECODE_CB(tdsc_decode_frame),
631 .close = tdsc_close,
632 .priv_data_size = sizeof(TDSCContext),
633 .p.capabilities = AV_CODEC_CAP_DR1,
634 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
635 };
636