FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/tdsc.c
Date: 2021-09-16 08:47:15
Exec Total Coverage
Lines: 253 327 77.4%
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
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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
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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
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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
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2 if (!codec)
123 return AVERROR_BUG;
124 2 ctx->jpeg_avctx = avcodec_alloc_context3(codec);
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->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
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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
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41 if (!ctx->cursor)
156 17 return;
157
158
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24 if (x + w > ctx->width)
159 w = ctx->width - x;
160
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24 if (y + h > ctx->height)
161 h = ctx->height - y;
162
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24 if (x < 0) {
163 w += x;
164 cursor += -x * 4;
165 } else {
166 24 dst += x * 3;
167 }
168
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24 if (y < 0) {
169 h += y;
170 cursor += -y * ctx->cursor_stride;
171 } else {
172 24 dst += y * stride;
173 }
174
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24 if (w < 0 || h < 0)
175 return;
176
177
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799 for (j = 0; j < h; j++) {
178
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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
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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
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3 if (ctx->cursor_w < 1 || ctx->cursor_w > 256 ||
211
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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
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3 if (ctx->cursor_hot_x > ctx->cursor_w ||
218
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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
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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
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3 switch (cursor_fmt) {
234 2 case CUR_FMT_MONO:
235
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66 for (j = 0; j < ctx->cursor_h; j++) {
236
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128 for (i = 0; i < ctx->cursor_w; i += 32) {
237 64 uint32_t bits = bytestream2_get_be32(&ctx->gbc);
238
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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
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66 for (j = 0; j < ctx->cursor_h; j++) {
249
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128 for (i = 0; i < ctx->cursor_w; i += 32) {
250 64 uint32_t bits = bytestream2_get_be32(&ctx->gbc);
251
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2112 for (k = 0; k < 32; k++) {
252 2048 int mask_bit = !!(bits & 0x80000000);
253
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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
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1 if (cursor_fmt & 8) { // RGBA -> ABGR
285
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40 for (j = 0; j < ctx->cursor_h; j++) {
286
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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
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8305 for (line = 0; line < height; line++) {
332
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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
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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
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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
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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)
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 /* 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
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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
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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
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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
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36 if (init_refframe) {
488 1 ret = av_frame_get_buffer(ctx->refframe, 0);
489
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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
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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
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34 if (action == 3) {
512 3 ret = tdsc_load_cursor(avctx);
513 /* Do not consider cursor errors fatal unless in explode mode */
514
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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
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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->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 const 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 };
637