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 AVFrame *jpgframe; // decoded JPEG tile
57 uint8_t *tilebuffer; // buffer containing tile data
58
59 /* zlib interaction */
60 uint8_t *deflatebuffer;
61 uLongf deflatelen;
62
63 /* All that is cursor */
64 uint8_t *cursor;
65 int cursor_stride;
66 int cursor_w, cursor_h, cursor_x, cursor_y;
67 int cursor_hot_x, cursor_hot_y;
68 } TDSCContext;
69
70 /* 1 byte bits, 1 byte planes, 2 bytes format (probably) */
71 enum TDSCCursorFormat {
72 CUR_FMT_MONO = 0x01010004,
73 CUR_FMT_BGRA = 0x20010004,
74 CUR_FMT_RGBA = 0x20010008,
75 };
76
tdsc_close(AVCodecContext * avctx)77 static av_cold int tdsc_close(AVCodecContext *avctx)
78 {
79 TDSCContext *ctx = avctx->priv_data;
80
81 av_frame_free(&ctx->refframe);
82 av_frame_free(&ctx->jpgframe);
83 av_freep(&ctx->deflatebuffer);
84 av_freep(&ctx->tilebuffer);
85 av_freep(&ctx->cursor);
86 avcodec_free_context(&ctx->jpeg_avctx);
87
88 return 0;
89 }
90
tdsc_init(AVCodecContext * avctx)91 static av_cold int tdsc_init(AVCodecContext *avctx)
92 {
93 TDSCContext *ctx = avctx->priv_data;
94 const AVCodec *codec;
95 int ret;
96
97 avctx->pix_fmt = AV_PIX_FMT_BGR24;
98
99 /* These needs to be set to estimate buffer and frame size */
100 if (!(avctx->width && avctx->height)) {
101 av_log(avctx, AV_LOG_ERROR, "Video size not set.\n");
102 return AVERROR_INVALIDDATA;
103 }
104
105 /* This value should be large enough for a RAW-only frame plus headers */
106 ctx->deflatelen = avctx->width * avctx->height * (3 + 1);
107 ret = av_reallocp(&ctx->deflatebuffer, ctx->deflatelen);
108 if (ret < 0)
109 return ret;
110
111 /* Allocate reference and JPEG frame */
112 ctx->refframe = av_frame_alloc();
113 ctx->jpgframe = av_frame_alloc();
114 if (!ctx->refframe || !ctx->jpgframe)
115 return AVERROR(ENOMEM);
116
117 /* Prepare everything needed for JPEG decoding */
118 codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG);
119 if (!codec)
120 return AVERROR_BUG;
121 ctx->jpeg_avctx = avcodec_alloc_context3(codec);
122 if (!ctx->jpeg_avctx)
123 return AVERROR(ENOMEM);
124 ctx->jpeg_avctx->flags = avctx->flags;
125 ctx->jpeg_avctx->flags2 = avctx->flags2;
126 ctx->jpeg_avctx->dct_algo = avctx->dct_algo;
127 ctx->jpeg_avctx->idct_algo = avctx->idct_algo;
128 ret = ff_codec_open2_recursive(ctx->jpeg_avctx, codec, NULL);
129 if (ret < 0)
130 return ret;
131
132 /* Set the output pixel format on the reference frame */
133 ctx->refframe->format = avctx->pix_fmt;
134
135 return 0;
136 }
137
138 #define APPLY_ALPHA(src, new, alpha) \
139 src = (src * (256 - alpha) + new * alpha) >> 8
140
141 /* Paint a region over a buffer, without drawing out of its bounds. */
tdsc_paint_cursor(AVCodecContext * avctx,uint8_t * dst,int stride)142 static void tdsc_paint_cursor(AVCodecContext *avctx, uint8_t *dst, int stride)
143 {
144 TDSCContext *ctx = avctx->priv_data;
145 const uint8_t *cursor = ctx->cursor;
146 int x = ctx->cursor_x - ctx->cursor_hot_x;
147 int y = ctx->cursor_y - ctx->cursor_hot_y;
148 int w = ctx->cursor_w;
149 int h = ctx->cursor_h;
150 int i, j;
151
152 if (!ctx->cursor)
153 return;
154
155 if (x + w > ctx->width)
156 w = ctx->width - x;
157 if (y + h > ctx->height)
158 h = ctx->height - y;
159 if (x < 0) {
160 w += x;
161 cursor += -x * 4;
162 } else {
163 dst += x * 3;
164 }
165 if (y < 0) {
166 h += y;
167 cursor += -y * ctx->cursor_stride;
168 } else {
169 dst += y * stride;
170 }
171 if (w < 0 || h < 0)
172 return;
173
174 for (j = 0; j < h; j++) {
175 for (i = 0; i < w; i++) {
176 uint8_t alpha = cursor[i * 4];
177 APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
178 APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
179 APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
180 }
181 dst += stride;
182 cursor += ctx->cursor_stride;
183 }
184 }
185
186 /* Load cursor data and store it in ABGR mode. */
tdsc_load_cursor(AVCodecContext * avctx)187 static int tdsc_load_cursor(AVCodecContext *avctx)
188 {
189 TDSCContext *ctx = avctx->priv_data;
190 int i, j, k, ret, cursor_fmt;
191 uint8_t *dst;
192
193 ctx->cursor_hot_x = bytestream2_get_le16(&ctx->gbc);
194 ctx->cursor_hot_y = bytestream2_get_le16(&ctx->gbc);
195 ctx->cursor_w = bytestream2_get_le16(&ctx->gbc);
196 ctx->cursor_h = bytestream2_get_le16(&ctx->gbc);
197
198 ctx->cursor_stride = FFALIGN(ctx->cursor_w, 32) * 4;
199 cursor_fmt = bytestream2_get_le32(&ctx->gbc);
200
201 if (ctx->cursor_x >= avctx->width || ctx->cursor_y >= avctx->height) {
202 av_log(avctx, AV_LOG_ERROR,
203 "Invalid cursor position (%d.%d outside %dx%d).\n",
204 ctx->cursor_x, ctx->cursor_y, avctx->width, avctx->height);
205 return AVERROR_INVALIDDATA;
206 }
207 if (ctx->cursor_w < 1 || ctx->cursor_w > 256 ||
208 ctx->cursor_h < 1 || ctx->cursor_h > 256) {
209 av_log(avctx, AV_LOG_ERROR,
210 "Invalid cursor dimensions %dx%d.\n",
211 ctx->cursor_w, ctx->cursor_h);
212 return AVERROR_INVALIDDATA;
213 }
214 if (ctx->cursor_hot_x > ctx->cursor_w ||
215 ctx->cursor_hot_y > ctx->cursor_h) {
216 av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %d.%d.\n",
217 ctx->cursor_hot_x, ctx->cursor_hot_y);
218 ctx->cursor_hot_x = FFMIN(ctx->cursor_hot_x, ctx->cursor_w - 1);
219 ctx->cursor_hot_y = FFMIN(ctx->cursor_hot_y, ctx->cursor_h - 1);
220 }
221
222 ret = av_reallocp(&ctx->cursor, ctx->cursor_stride * ctx->cursor_h);
223 if (ret < 0) {
224 av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer.\n");
225 return ret;
226 }
227
228 dst = ctx->cursor;
229 /* here data is packed in BE */
230 switch (cursor_fmt) {
231 case CUR_FMT_MONO:
232 for (j = 0; j < ctx->cursor_h; j++) {
233 for (i = 0; i < ctx->cursor_w; i += 32) {
234 uint32_t bits = bytestream2_get_be32(&ctx->gbc);
235 for (k = 0; k < 32; k++) {
236 dst[0] = !!(bits & 0x80000000);
237 dst += 4;
238 bits <<= 1;
239 }
240 }
241 dst += ctx->cursor_stride - ctx->cursor_w * 4;
242 }
243
244 dst = ctx->cursor;
245 for (j = 0; j < ctx->cursor_h; j++) {
246 for (i = 0; i < ctx->cursor_w; i += 32) {
247 uint32_t bits = bytestream2_get_be32(&ctx->gbc);
248 for (k = 0; k < 32; k++) {
249 int mask_bit = !!(bits & 0x80000000);
250 switch (dst[0] * 2 + mask_bit) {
251 case 0:
252 dst[0] = 0xFF;
253 dst[1] = 0x00;
254 dst[2] = 0x00;
255 dst[3] = 0x00;
256 break;
257 case 1:
258 dst[0] = 0xFF;
259 dst[1] = 0xFF;
260 dst[2] = 0xFF;
261 dst[3] = 0xFF;
262 break;
263 default:
264 dst[0] = 0x00;
265 dst[1] = 0x00;
266 dst[2] = 0x00;
267 dst[3] = 0x00;
268 }
269 dst += 4;
270 bits <<= 1;
271 }
272 }
273 dst += ctx->cursor_stride - ctx->cursor_w * 4;
274 }
275 break;
276 case CUR_FMT_BGRA:
277 case CUR_FMT_RGBA:
278 /* Skip monochrome version of the cursor */
279 bytestream2_skip(&ctx->gbc,
280 ctx->cursor_h * (FFALIGN(ctx->cursor_w, 32) >> 3));
281 if (cursor_fmt & 8) { // RGBA -> ABGR
282 for (j = 0; j < ctx->cursor_h; j++) {
283 for (i = 0; i < ctx->cursor_w; i++) {
284 int val = bytestream2_get_be32(&ctx->gbc);
285 *dst++ = val >> 24;
286 *dst++ = val >> 16;
287 *dst++ = val >> 8;
288 *dst++ = val >> 0;
289 }
290 dst += ctx->cursor_stride - ctx->cursor_w * 4;
291 }
292 } else { // BGRA -> ABGR
293 for (j = 0; j < ctx->cursor_h; j++) {
294 for (i = 0; i < ctx->cursor_w; i++) {
295 int val = bytestream2_get_be32(&ctx->gbc);
296 *dst++ = val >> 0;
297 *dst++ = val >> 24;
298 *dst++ = val >> 16;
299 *dst++ = val >> 8;
300 }
301 dst += ctx->cursor_stride - ctx->cursor_w * 4;
302 }
303 }
304 break;
305 default:
306 avpriv_request_sample(avctx, "Cursor format %08x", cursor_fmt);
307 return AVERROR_PATCHWELCOME;
308 }
309
310 return 0;
311 }
312
313 /* Convert a single YUV pixel to RGB. */
tdsc_yuv2rgb(uint8_t * out,int Y,int U,int V)314 static inline void tdsc_yuv2rgb(uint8_t *out, int Y, int U, int V)
315 {
316 out[0] = av_clip_uint8(Y + ( 91881 * V + 32768 >> 16));
317 out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
318 out[2] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
319 }
320
321 /* Convert a YUV420 buffer to a RGB buffer. */
tdsc_blit(uint8_t * dst,int dst_stride,const uint8_t * srcy,int srcy_stride,const uint8_t * srcu,const uint8_t * srcv,int srcuv_stride,int width,int height)322 static av_always_inline void tdsc_blit(uint8_t *dst, int dst_stride,
323 const uint8_t *srcy, int srcy_stride,
324 const uint8_t *srcu, const uint8_t *srcv,
325 int srcuv_stride, int width, int height)
326 {
327 int col, line;
328 for (line = 0; line < height; line++) {
329 for (col = 0; col < width; col++)
330 tdsc_yuv2rgb(dst + col * 3, srcy[col],
331 srcu[col >> 1] - 128, srcv[col >> 1] - 128);
332
333 dst += dst_stride;
334 srcy += srcy_stride;
335 srcu += srcuv_stride * (line & 1);
336 srcv += srcuv_stride * (line & 1);
337 }
338 }
339
340 /* Invoke the MJPEG decoder to decode the tile. */
tdsc_decode_jpeg_tile(AVCodecContext * avctx,int tile_size,int x,int y,int w,int h)341 static int tdsc_decode_jpeg_tile(AVCodecContext *avctx, int tile_size,
342 int x, int y, int w, int h)
343 {
344 TDSCContext *ctx = avctx->priv_data;
345 AVPacket jpkt;
346 int ret;
347
348 /* Prepare a packet and send to the MJPEG decoder */
349 av_init_packet(&jpkt);
350 jpkt.data = ctx->tilebuffer;
351 jpkt.size = tile_size;
352
353 ret = avcodec_send_packet(ctx->jpeg_avctx, &jpkt);
354 if (ret < 0) {
355 av_log(avctx, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
356 return ret;
357 }
358
359 ret = avcodec_receive_frame(ctx->jpeg_avctx, ctx->jpgframe);
360 if (ret < 0 || ctx->jpgframe->format != AV_PIX_FMT_YUVJ420P) {
361 av_log(avctx, AV_LOG_ERROR,
362 "JPEG decoding error (%d).\n", ret);
363
364 /* Normally skip, error if explode */
365 if (avctx->err_recognition & AV_EF_EXPLODE)
366 return AVERROR_INVALIDDATA;
367 else
368 return 0;
369 }
370
371 /* Let's paint onto the buffer */
372 tdsc_blit(ctx->refframe->data[0] + x * 3 + ctx->refframe->linesize[0] * y,
373 ctx->refframe->linesize[0],
374 ctx->jpgframe->data[0], ctx->jpgframe->linesize[0],
375 ctx->jpgframe->data[1], ctx->jpgframe->data[2],
376 ctx->jpgframe->linesize[1], w, h);
377
378 av_frame_unref(ctx->jpgframe);
379
380 return 0;
381 }
382
383 /* Parse frame and either copy data or decode JPEG. */
tdsc_decode_tiles(AVCodecContext * avctx,int number_tiles)384 static int tdsc_decode_tiles(AVCodecContext *avctx, int number_tiles)
385 {
386 TDSCContext *ctx = avctx->priv_data;
387 int i;
388
389 /* Iterate over the number of tiles */
390 for (i = 0; i < number_tiles; i++) {
391 int tile_size;
392 int tile_mode;
393 int x, y, x2, y2, w, h;
394 int ret;
395
396 if (bytestream2_get_bytes_left(&ctx->gbc) < 4 ||
397 bytestream2_get_le32(&ctx->gbc) != MKTAG('T','D','S','B') ||
398 bytestream2_get_bytes_left(&ctx->gbc) < TDSB_HEADER_SIZE - 4) {
399 av_log(avctx, AV_LOG_ERROR, "TDSB tag is too small.\n");
400 return AVERROR_INVALIDDATA;
401 }
402
403 tile_size = bytestream2_get_le32(&ctx->gbc);
404 if (bytestream2_get_bytes_left(&ctx->gbc) < tile_size)
405 return AVERROR_INVALIDDATA;
406
407 tile_mode = bytestream2_get_le32(&ctx->gbc);
408 bytestream2_skip(&ctx->gbc, 4); // unknown
409 x = bytestream2_get_le32(&ctx->gbc);
410 y = bytestream2_get_le32(&ctx->gbc);
411 x2 = bytestream2_get_le32(&ctx->gbc);
412 y2 = bytestream2_get_le32(&ctx->gbc);
413
414 if (x < 0 || y < 0 || x2 <= x || y2 <= y ||
415 x2 > ctx->width || y2 > ctx->height
416 ) {
417 av_log(avctx, AV_LOG_ERROR,
418 "Invalid tile position (%d.%d %d.%d outside %dx%d).\n",
419 x, y, x2, y2, ctx->width, ctx->height);
420 return AVERROR_INVALIDDATA;
421 }
422 w = x2 - x;
423 h = y2 - y;
424
425 ret = av_reallocp(&ctx->tilebuffer, tile_size);
426 if (!ctx->tilebuffer)
427 return ret;
428
429 bytestream2_get_buffer(&ctx->gbc, ctx->tilebuffer, tile_size);
430
431 if (tile_mode == MKTAG('G','E','P','J')) {
432 /* Decode JPEG tile and copy it in the reference frame */
433 ret = tdsc_decode_jpeg_tile(avctx, tile_size, x, y, w, h);
434 if (ret < 0)
435 return ret;
436 } else if (tile_mode == MKTAG(' ','W','A','R')) {
437 /* Just copy the buffer to output */
438 av_image_copy_plane(ctx->refframe->data[0] + x * 3 +
439 ctx->refframe->linesize[0] * y,
440 ctx->refframe->linesize[0], ctx->tilebuffer,
441 w * 3, w * 3, h);
442 } else {
443 av_log(avctx, AV_LOG_ERROR, "Unknown tile type %08x.\n", tile_mode);
444 return AVERROR_INVALIDDATA;
445 }
446 av_log(avctx, AV_LOG_DEBUG, "Tile %d, %dx%d (%d.%d)\n", i, w, h, x, y);
447 }
448
449 return 0;
450 }
451
tdsc_parse_tdsf(AVCodecContext * avctx,int number_tiles)452 static int tdsc_parse_tdsf(AVCodecContext *avctx, int number_tiles)
453 {
454 TDSCContext *ctx = avctx->priv_data;
455 int ret, w, h, init_refframe = !ctx->refframe->data[0];
456
457 /* BITMAPINFOHEADER
458 * http://msdn.microsoft.com/en-us/library/windows/desktop/dd183376.aspx */
459 if (bytestream2_get_le32(&ctx->gbc) != BITMAPINFOHEADER_SIZE)
460 return AVERROR_INVALIDDATA;
461
462 /* Store size, but wait for context reinit before updating avctx */
463 w = bytestream2_get_le32(&ctx->gbc);
464 h = -bytestream2_get_le32(&ctx->gbc);
465
466 if (bytestream2_get_le16(&ctx->gbc) != 1 || // 1 plane
467 bytestream2_get_le16(&ctx->gbc) != 24) // BGR24
468 return AVERROR_INVALIDDATA;
469
470 bytestream2_skip(&ctx->gbc, 24); // unused fields
471
472 /* Update sizes */
473 if (avctx->width != w || avctx->height != h) {
474 av_log(avctx, AV_LOG_DEBUG, "Size update %dx%d -> %d%d.\n",
475 avctx->width, avctx->height, ctx->width, ctx->height);
476 ret = ff_set_dimensions(avctx, w, h);
477 if (ret < 0)
478 return ret;
479 init_refframe = 1;
480 }
481 ctx->refframe->width = ctx->width = w;
482 ctx->refframe->height = ctx->height = h;
483
484 /* Allocate the reference frame if not already done or on size change */
485 if (init_refframe) {
486 ret = av_frame_get_buffer(ctx->refframe, 0);
487 if (ret < 0)
488 return ret;
489 }
490
491 /* Decode all tiles in a frame */
492 return tdsc_decode_tiles(avctx, number_tiles);
493 }
494
tdsc_parse_dtsm(AVCodecContext * avctx)495 static int tdsc_parse_dtsm(AVCodecContext *avctx)
496 {
497 TDSCContext *ctx = avctx->priv_data;
498 int ret;
499 int action = bytestream2_get_le32(&ctx->gbc);
500
501 bytestream2_skip(&ctx->gbc, 4); // some kind of ID or version maybe?
502
503 if (action == 2 || action == 3) {
504 /* Load cursor coordinates */
505 ctx->cursor_x = bytestream2_get_le32(&ctx->gbc);
506 ctx->cursor_y = bytestream2_get_le32(&ctx->gbc);
507
508 /* Load a full cursor sprite */
509 if (action == 3) {
510 ret = tdsc_load_cursor(avctx);
511 /* Do not consider cursor errors fatal unless in explode mode */
512 if (ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
513 return ret;
514 }
515 } else {
516 avpriv_request_sample(avctx, "Cursor action %d", action);
517 }
518
519 return 0;
520 }
521
tdsc_decode_frame(AVCodecContext * avctx,void * data,int * got_frame,AVPacket * avpkt)522 static int tdsc_decode_frame(AVCodecContext *avctx, void *data,
523 int *got_frame, AVPacket *avpkt)
524 {
525 TDSCContext *ctx = avctx->priv_data;
526 AVFrame *frame = data;
527 int ret, tag_header, keyframe = 0;
528 uLongf dlen;
529
530 /* Resize deflate buffer on resolution change */
531 if (ctx->width != avctx->width || ctx->height != avctx->height) {
532 ctx->deflatelen = avctx->width * avctx->height * (3 + 1);
533 ret = av_reallocp(&ctx->deflatebuffer, ctx->deflatelen);
534 if (ret < 0)
535 return ret;
536 }
537 dlen = ctx->deflatelen;
538
539 /* Frames are deflated, need to inflate them first */
540 ret = uncompress(ctx->deflatebuffer, &dlen, avpkt->data, avpkt->size);
541 if (ret) {
542 av_log(avctx, AV_LOG_ERROR, "Deflate error %d.\n", ret);
543 return AVERROR_UNKNOWN;
544 }
545
546 bytestream2_init(&ctx->gbc, ctx->deflatebuffer, dlen);
547
548 /* Check for tag and for size info */
549 if (bytestream2_get_bytes_left(&ctx->gbc) < 4 + 4) {
550 av_log(avctx, AV_LOG_ERROR, "Frame is too small.\n");
551 return AVERROR_INVALIDDATA;
552 }
553
554 /* Read tag */
555 tag_header = bytestream2_get_le32(&ctx->gbc);
556
557 if (tag_header == MKTAG('T','D','S','F')) {
558 int number_tiles;
559 if (bytestream2_get_bytes_left(&ctx->gbc) < TDSF_HEADER_SIZE) {
560 av_log(avctx, AV_LOG_ERROR, "TDSF tag is too small.\n");
561 return AVERROR_INVALIDDATA;
562 }
563 /* First 4 bytes here are the number of GEPJ/WAR tiles in this frame */
564 number_tiles = bytestream2_get_le32(&ctx->gbc);
565
566 bytestream2_skip(&ctx->gbc, 4); // internal timestamp maybe?
567 keyframe = bytestream2_get_le32(&ctx->gbc) == 0x30;
568
569 ret = tdsc_parse_tdsf(avctx, number_tiles);
570 if (ret < 0)
571 return ret;
572
573 /* Check if there is anything else we are able to parse */
574 if (bytestream2_get_bytes_left(&ctx->gbc) >= 4 + 4)
575 tag_header = bytestream2_get_le32(&ctx->gbc);
576 }
577
578 /* This tag can be after a TDSF block or on its own frame */
579 if (tag_header == MKTAG('D','T','S','M')) {
580 /* First 4 bytes here are the total size in bytes for this frame */
581 int tag_size = bytestream2_get_le32(&ctx->gbc);
582
583 if (bytestream2_get_bytes_left(&ctx->gbc) < tag_size) {
584 av_log(avctx, AV_LOG_ERROR, "DTSM tag is too small.\n");
585 return AVERROR_INVALIDDATA;
586 }
587
588 ret = tdsc_parse_dtsm(avctx);
589 if (ret < 0)
590 return ret;
591 }
592
593 /* Get the output frame and copy the reference frame */
594 ret = ff_get_buffer(avctx, frame, 0);
595 if (ret < 0)
596 return ret;
597
598 ret = av_frame_copy(frame, ctx->refframe);
599 if (ret < 0)
600 return ret;
601
602 /* Paint the cursor on the output frame */
603 tdsc_paint_cursor(avctx, frame->data[0], frame->linesize[0]);
604
605 /* Frame is ready to be output */
606 if (keyframe) {
607 frame->pict_type = AV_PICTURE_TYPE_I;
608 frame->key_frame = 1;
609 } else {
610 frame->pict_type = AV_PICTURE_TYPE_P;
611 }
612 *got_frame = 1;
613
614 return avpkt->size;
615 }
616
617 AVCodec ff_tdsc_decoder = {
618 .name = "tdsc",
619 .long_name = NULL_IF_CONFIG_SMALL("TDSC"),
620 .type = AVMEDIA_TYPE_VIDEO,
621 .id = AV_CODEC_ID_TDSC,
622 .init = tdsc_init,
623 .decode = tdsc_decode_frame,
624 .close = tdsc_close,
625 .priv_data_size = sizeof(TDSCContext),
626 .capabilities = AV_CODEC_CAP_DR1,
627 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
628 FF_CODEC_CAP_INIT_CLEANUP,
629 };
630