2 * FLI/FLC Animation Video Decoder
3 * Copyright (C) 2003, 2004 The FFmpeg project
5 * This file is part of FFmpeg.
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.
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.
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
24 * Autodesk Animator FLI/FLC Video Decoder
25 * by Mike Melanson (melanson@pcisys.net)
26 * for more information on the .fli/.flc file format and all of its many
28 * http://www.compuphase.com/flic.htm
30 * This decoder outputs PAL8/RGB555/RGB565/BGR24. To use this decoder, be
31 * sure that your demuxer sends the FLI file header to the decoder via
32 * the extradata chunk in AVCodecContext. The chunk should be 128 bytes
33 * large. The only exception is for FLI files from the game "Magic Carpet",
34 * in which the header is only 12 bytes.
41 #include "libavutil/intreadwrite.h"
43 #include "bytestream.h"
47 #define FLI_256_COLOR 4
55 #define FLI_DTA_BRUN 25
56 #define FLI_DTA_COPY 26
59 #define FLI_TYPE_CODE (0xAF11)
60 #define FLC_FLX_TYPE_CODE (0xAF12)
61 #define FLC_DTA_TYPE_CODE (0xAF44) /* Marks an "Extended FLC" comes from Dave's Targa Animator (DTA) */
62 #define FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE (0xAF13)
64 #define CHECK_PIXEL_PTR(n) \
65 if (pixel_ptr + n > pixel_limit) { \
66 av_log (s->avctx, AV_LOG_ERROR, "Invalid pixel_ptr = %d > pixel_limit = %d\n", \
67 pixel_ptr + n, pixel_limit); \
68 return AVERROR_INVALIDDATA; \
71 typedef struct FlicDecodeContext {
72 AVCodecContext *avctx;
75 unsigned int palette[256];
77 int fli_type; /* either 0xAF11 or 0xAF12, affects palette resolution */
80 static av_cold int flic_decode_init(AVCodecContext *avctx)
82 FlicDecodeContext *s = avctx->priv_data;
83 unsigned char *fli_header = (unsigned char *)avctx->extradata;
86 if (avctx->extradata_size != 0 &&
87 avctx->extradata_size != 12 &&
88 avctx->extradata_size != 128 &&
89 avctx->extradata_size != 256 &&
90 avctx->extradata_size != 904 &&
91 avctx->extradata_size != 1024) {
92 av_log(avctx, AV_LOG_ERROR, "Unexpected extradata size %d\n", avctx->extradata_size);
93 return AVERROR_INVALIDDATA;
98 if (s->avctx->extradata_size == 12) {
99 /* special case for magic carpet FLIs */
100 s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE;
102 } else if (avctx->extradata_size == 1024) {
103 uint8_t *ptr = avctx->extradata;
106 for (i = 0; i < 256; i++) {
107 s->palette[i] = AV_RL32(ptr);
111 /* FLI in MOV, see e.g. FFmpeg trac issue #626 */
112 } else if (avctx->extradata_size == 0 ||
113 avctx->extradata_size == 256 ||
114 /* see FFmpeg ticket #1234 */
115 avctx->extradata_size == 904) {
116 s->fli_type = FLI_TYPE_CODE;
119 s->fli_type = AV_RL16(&fli_header[4]);
120 depth = AV_RL16(&fli_header[12]);
124 depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
127 if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
128 depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
132 case 8 : avctx->pix_fmt = AV_PIX_FMT_PAL8; break;
133 case 15 : avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
134 case 16 : avctx->pix_fmt = AV_PIX_FMT_RGB565; break;
135 case 24 : avctx->pix_fmt = AV_PIX_FMT_BGR24; break;
137 av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
138 return AVERROR_INVALIDDATA;
141 s->frame = av_frame_alloc();
143 return AVERROR(ENOMEM);
150 static int flic_decode_frame_8BPP(AVCodecContext *avctx,
151 void *data, int *got_frame,
152 const uint8_t *buf, int buf_size)
154 FlicDecodeContext *s = avctx->priv_data;
159 unsigned char palette_idx1;
160 unsigned char palette_idx2;
162 unsigned int frame_size;
165 unsigned int chunk_size;
173 unsigned char r, g, b;
176 int compressed_lines;
178 signed short line_packets;
183 unsigned char *pixels;
184 unsigned int pixel_limit;
186 bytestream2_init(&g2, buf, buf_size);
188 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
191 pixels = s->frame->data[0];
192 pixel_limit = s->avctx->height * s->frame->linesize[0];
193 if (buf_size < 16 || buf_size > INT_MAX - (3 * 256 + AV_INPUT_BUFFER_PADDING_SIZE))
194 return AVERROR_INVALIDDATA;
195 frame_size = bytestream2_get_le32(&g2);
196 if (frame_size > buf_size)
197 frame_size = buf_size;
198 bytestream2_skip(&g2, 2); /* skip the magic number */
199 num_chunks = bytestream2_get_le16(&g2);
200 bytestream2_skip(&g2, 8); /* skip padding */
203 return AVERROR_INVALIDDATA;
207 /* iterate through the chunks */
208 while ((frame_size >= 6) && (num_chunks > 0) &&
209 bytestream2_get_bytes_left(&g2) >= 4) {
210 int stream_ptr_after_chunk;
211 chunk_size = bytestream2_get_le32(&g2);
212 if (chunk_size > frame_size) {
213 av_log(avctx, AV_LOG_WARNING,
214 "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);
215 chunk_size = frame_size;
217 stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
219 chunk_type = bytestream2_get_le16(&g2);
221 switch (chunk_type) {
224 /* check special case: If this file is from the Magic Carpet
225 * game and uses 6-bit colors even though it reports 256-color
226 * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
228 if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
232 /* set up the palette */
233 color_packets = bytestream2_get_le16(&g2);
235 for (i = 0; i < color_packets; i++) {
236 /* first byte is how many colors to skip */
237 palette_ptr += bytestream2_get_byte(&g2);
239 /* next byte indicates how many entries to change */
240 color_changes = bytestream2_get_byte(&g2);
242 /* if there are 0 color changes, there are actually 256 */
243 if (color_changes == 0)
246 if (bytestream2_tell(&g2) + color_changes * 3 > stream_ptr_after_chunk)
249 for (j = 0; j < color_changes; j++) {
252 /* wrap around, for good measure */
253 if ((unsigned)palette_ptr >= 256)
256 r = bytestream2_get_byte(&g2) << color_shift;
257 g = bytestream2_get_byte(&g2) << color_shift;
258 b = bytestream2_get_byte(&g2) << color_shift;
259 entry = 0xFFU << 24 | r << 16 | g << 8 | b;
260 if (color_shift == 2)
261 entry |= entry >> 6 & 0x30303;
262 if (s->palette[palette_ptr] != entry)
264 s->palette[palette_ptr++] = entry;
271 compressed_lines = bytestream2_get_le16(&g2);
272 while (compressed_lines > 0) {
273 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
275 if (y_ptr > pixel_limit)
276 return AVERROR_INVALIDDATA;
277 line_packets = bytestream2_get_le16(&g2);
278 if ((line_packets & 0xC000) == 0xC000) {
280 line_packets = -line_packets;
281 if (line_packets > s->avctx->height)
282 return AVERROR_INVALIDDATA;
283 y_ptr += line_packets * s->frame->linesize[0];
284 } else if ((line_packets & 0xC000) == 0x4000) {
285 av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);
286 } else if ((line_packets & 0xC000) == 0x8000) {
287 // "last byte" opcode
288 pixel_ptr= y_ptr + s->frame->linesize[0] - 1;
290 pixels[pixel_ptr] = line_packets & 0xff;
295 pixel_countdown = s->avctx->width;
296 for (i = 0; i < line_packets; i++) {
297 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
299 /* account for the skip bytes */
300 pixel_skip = bytestream2_get_byte(&g2);
301 pixel_ptr += pixel_skip;
302 pixel_countdown -= pixel_skip;
303 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
305 byte_run = -byte_run;
306 palette_idx1 = bytestream2_get_byte(&g2);
307 palette_idx2 = bytestream2_get_byte(&g2);
308 CHECK_PIXEL_PTR(byte_run * 2);
309 for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
310 pixels[pixel_ptr++] = palette_idx1;
311 pixels[pixel_ptr++] = palette_idx2;
314 CHECK_PIXEL_PTR(byte_run * 2);
315 if (bytestream2_tell(&g2) + byte_run * 2 > stream_ptr_after_chunk)
317 for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
318 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
323 y_ptr += s->frame->linesize[0];
329 /* line compressed */
330 starting_line = bytestream2_get_le16(&g2);
331 if (starting_line >= s->avctx->height)
332 return AVERROR_INVALIDDATA;
334 y_ptr += starting_line * s->frame->linesize[0];
336 compressed_lines = bytestream2_get_le16(&g2);
337 while (compressed_lines > 0) {
340 pixel_countdown = s->avctx->width;
341 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
343 line_packets = bytestream2_get_byte(&g2);
344 if (line_packets > 0) {
345 for (i = 0; i < line_packets; i++) {
346 /* account for the skip bytes */
347 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
349 pixel_skip = bytestream2_get_byte(&g2);
350 pixel_ptr += pixel_skip;
351 pixel_countdown -= pixel_skip;
352 byte_run = sign_extend(bytestream2_get_byte(&g2),8);
354 CHECK_PIXEL_PTR(byte_run);
355 if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
357 for (j = 0; j < byte_run; j++, pixel_countdown--) {
358 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
360 } else if (byte_run < 0) {
361 byte_run = -byte_run;
362 palette_idx1 = bytestream2_get_byte(&g2);
363 CHECK_PIXEL_PTR(byte_run);
364 for (j = 0; j < byte_run; j++, pixel_countdown--) {
365 pixels[pixel_ptr++] = palette_idx1;
371 y_ptr += s->frame->linesize[0];
377 /* set the whole frame to color 0 (which is usually black) */
379 s->frame->linesize[0] * s->avctx->height);
383 /* Byte run compression: This chunk type only occurs in the first
384 * FLI frame and it will update the entire frame. */
386 for (lines = 0; lines < s->avctx->height; lines++) {
388 /* disregard the line packets; instead, iterate through all
390 bytestream2_skip(&g2, 1);
391 pixel_countdown = s->avctx->width;
392 while (pixel_countdown > 0) {
393 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
395 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
397 av_log(avctx, AV_LOG_ERROR, "Invalid byte run value.\n");
398 return AVERROR_INVALIDDATA;
402 palette_idx1 = bytestream2_get_byte(&g2);
403 CHECK_PIXEL_PTR(byte_run);
404 for (j = 0; j < byte_run; j++) {
405 pixels[pixel_ptr++] = palette_idx1;
407 if (pixel_countdown < 0)
408 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
409 pixel_countdown, lines);
411 } else { /* copy bytes if byte_run < 0 */
412 byte_run = -byte_run;
413 CHECK_PIXEL_PTR(byte_run);
414 if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
416 for (j = 0; j < byte_run; j++) {
417 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
419 if (pixel_countdown < 0)
420 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
421 pixel_countdown, lines);
426 y_ptr += s->frame->linesize[0];
431 /* copy the chunk (uncompressed frame) */
432 if (chunk_size - 6 != FFALIGN(s->avctx->width, 4) * s->avctx->height) {
433 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
434 "has incorrect size, skipping chunk\n", chunk_size - 6);
435 bytestream2_skip(&g2, chunk_size - 6);
437 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;
438 y_ptr += s->frame->linesize[0]) {
439 bytestream2_get_buffer(&g2, &pixels[y_ptr],
441 if (s->avctx->width & 3)
442 bytestream2_skip(&g2, 4 - (s->avctx->width & 3));
448 /* some sort of a thumbnail? disregard this chunk... */
452 av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
456 if (stream_ptr_after_chunk - bytestream2_tell(&g2) >= 0) {
457 bytestream2_skip(&g2, stream_ptr_after_chunk - bytestream2_tell(&g2));
459 av_log(avctx, AV_LOG_ERROR, "Chunk overread\n");
463 frame_size -= chunk_size;
467 /* by the end of the chunk, the stream ptr should equal the frame
468 * size (minus 1 or 2, possibly); if it doesn't, issue a warning */
469 if (bytestream2_get_bytes_left(&g2) > 2)
470 av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
471 "and final chunk ptr = %d\n", buf_size,
472 buf_size - bytestream2_get_bytes_left(&g2));
474 /* make the palette available on the way out */
475 memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
476 if (s->new_palette) {
477 s->frame->palette_has_changed = 1;
481 if ((ret = av_frame_ref(data, s->frame)) < 0)
489 static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
490 void *data, int *got_frame,
491 const uint8_t *buf, int buf_size)
493 /* Note, the only difference between the 15Bpp and 16Bpp */
494 /* Format is the pixel format, the packets are processed the same. */
495 FlicDecodeContext *s = avctx->priv_data;
499 unsigned char palette_idx1;
501 unsigned int frame_size;
504 unsigned int chunk_size;
510 int compressed_lines;
511 signed short line_packets;
516 unsigned char *pixels;
518 unsigned int pixel_limit;
520 bytestream2_init(&g2, buf, buf_size);
522 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
525 pixels = s->frame->data[0];
526 pixel_limit = s->avctx->height * s->frame->linesize[0];
528 frame_size = bytestream2_get_le32(&g2);
529 bytestream2_skip(&g2, 2); /* skip the magic number */
530 num_chunks = bytestream2_get_le16(&g2);
531 bytestream2_skip(&g2, 8); /* skip padding */
532 if (frame_size > buf_size)
533 frame_size = buf_size;
536 return AVERROR_INVALIDDATA;
539 /* iterate through the chunks */
540 while ((frame_size > 0) && (num_chunks > 0) &&
541 bytestream2_get_bytes_left(&g2) >= 4) {
542 int stream_ptr_after_chunk;
543 chunk_size = bytestream2_get_le32(&g2);
544 if (chunk_size > frame_size) {
545 av_log(avctx, AV_LOG_WARNING,
546 "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);
547 chunk_size = frame_size;
549 stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
551 chunk_type = bytestream2_get_le16(&g2);
554 switch (chunk_type) {
557 /* For some reason, it seems that non-palettized flics do
558 * include one of these chunks in their first frame.
559 * Why I do not know, it seems rather extraneous. */
561 "Unexpected Palette chunk %d in non-palettized FLC\n",
563 bytestream2_skip(&g2, chunk_size - 6);
569 compressed_lines = bytestream2_get_le16(&g2);
570 while (compressed_lines > 0) {
571 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
573 if (y_ptr > pixel_limit)
574 return AVERROR_INVALIDDATA;
575 line_packets = bytestream2_get_le16(&g2);
576 if (line_packets < 0) {
577 line_packets = -line_packets;
578 if (line_packets > s->avctx->height)
579 return AVERROR_INVALIDDATA;
580 y_ptr += line_packets * s->frame->linesize[0];
585 pixel_countdown = s->avctx->width;
586 for (i = 0; i < line_packets; i++) {
587 /* account for the skip bytes */
588 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
590 pixel_skip = bytestream2_get_byte(&g2);
591 pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
592 pixel_countdown -= pixel_skip;
593 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
595 byte_run = -byte_run;
596 pixel = bytestream2_get_le16(&g2);
597 CHECK_PIXEL_PTR(2 * byte_run);
598 for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
599 *((signed short*)(&pixels[pixel_ptr])) = pixel;
603 if (bytestream2_tell(&g2) + 2*byte_run > stream_ptr_after_chunk)
605 CHECK_PIXEL_PTR(2 * byte_run);
606 for (j = 0; j < byte_run; j++, pixel_countdown--) {
607 *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
613 y_ptr += s->frame->linesize[0];
619 av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-palettized FLC\n");
620 bytestream2_skip(&g2, chunk_size - 6);
624 /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */
625 memset(pixels, 0x0000,
626 s->frame->linesize[0] * s->avctx->height);
631 for (lines = 0; lines < s->avctx->height; lines++) {
633 /* disregard the line packets; instead, iterate through all
635 bytestream2_skip(&g2, 1);
636 pixel_countdown = (s->avctx->width * 2);
638 while (pixel_countdown > 0) {
639 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
641 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
643 palette_idx1 = bytestream2_get_byte(&g2);
644 CHECK_PIXEL_PTR(byte_run);
645 for (j = 0; j < byte_run; j++) {
646 pixels[pixel_ptr++] = palette_idx1;
648 if (pixel_countdown < 0)
649 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
650 pixel_countdown, lines);
652 } else { /* copy bytes if byte_run < 0 */
653 byte_run = -byte_run;
654 if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
656 CHECK_PIXEL_PTR(byte_run);
657 for (j = 0; j < byte_run; j++) {
658 palette_idx1 = bytestream2_get_byte(&g2);
659 pixels[pixel_ptr++] = palette_idx1;
661 if (pixel_countdown < 0)
662 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
663 pixel_countdown, lines);
668 /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
669 * This does not give us any good opportunity to perform word endian conversion
670 * during decompression. So if it is required (i.e., this is not a LE target, we do
671 * a second pass over the line here, swapping the bytes.
675 pixel_countdown = s->avctx->width;
676 while (pixel_countdown > 0) {
677 *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]);
681 y_ptr += s->frame->linesize[0];
687 for (lines = 0; lines < s->avctx->height; lines++) {
689 /* disregard the line packets; instead, iterate through all
691 bytestream2_skip(&g2, 1);
692 pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
694 while (pixel_countdown > 0) {
695 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
697 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
699 pixel = bytestream2_get_le16(&g2);
700 CHECK_PIXEL_PTR(2 * byte_run);
701 for (j = 0; j < byte_run; j++) {
702 *((signed short*)(&pixels[pixel_ptr])) = pixel;
705 if (pixel_countdown < 0)
706 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
709 } else { /* copy pixels if byte_run < 0 */
710 byte_run = -byte_run;
711 if (bytestream2_tell(&g2) + 2 * byte_run > stream_ptr_after_chunk)
713 CHECK_PIXEL_PTR(2 * byte_run);
714 for (j = 0; j < byte_run; j++) {
715 *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
718 if (pixel_countdown < 0)
719 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
725 y_ptr += s->frame->linesize[0];
731 /* copy the chunk (uncompressed frame) */
732 if (chunk_size - 6 > (unsigned int)(FFALIGN(s->avctx->width, 2) * s->avctx->height)*2) {
733 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
734 "bigger than image, skipping chunk\n", chunk_size - 6);
735 bytestream2_skip(&g2, chunk_size - 6);
738 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;
739 y_ptr += s->frame->linesize[0]) {
741 pixel_countdown = s->avctx->width;
743 while (pixel_countdown > 0) {
744 *((signed short*)(&pixels[y_ptr + pixel_ptr])) = bytestream2_get_le16(&g2);
748 if (s->avctx->width & 1)
749 bytestream2_skip(&g2, 2);
755 /* some sort of a thumbnail? disregard this chunk... */
756 bytestream2_skip(&g2, chunk_size - 6);
760 av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
764 if (stream_ptr_after_chunk - bytestream2_tell(&g2) >= 0) {
765 bytestream2_skip(&g2, stream_ptr_after_chunk - bytestream2_tell(&g2));
767 av_log(avctx, AV_LOG_ERROR, "Chunk overread\n");
771 frame_size -= chunk_size;
775 /* by the end of the chunk, the stream ptr should equal the frame
776 * size (minus 1, possibly); if it doesn't, issue a warning */
777 if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1))
778 av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
779 "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2));
781 if ((ret = av_frame_ref(data, s->frame)) < 0)
789 static int flic_decode_frame_24BPP(AVCodecContext *avctx,
790 void *data, int *got_frame,
791 const uint8_t *buf, int buf_size)
793 FlicDecodeContext *s = avctx->priv_data;
797 unsigned char palette_idx1;
799 unsigned int frame_size;
802 unsigned int chunk_size;
808 int compressed_lines;
809 signed short line_packets;
814 unsigned char *pixels;
816 unsigned int pixel_limit;
818 bytestream2_init(&g2, buf, buf_size);
820 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
823 pixels = s->frame->data[0];
824 pixel_limit = s->avctx->height * s->frame->linesize[0];
826 frame_size = bytestream2_get_le32(&g2);
827 bytestream2_skip(&g2, 2); /* skip the magic number */
828 num_chunks = bytestream2_get_le16(&g2);
829 bytestream2_skip(&g2, 8); /* skip padding */
830 if (frame_size > buf_size)
831 frame_size = buf_size;
834 return AVERROR_INVALIDDATA;
837 /* iterate through the chunks */
838 while ((frame_size > 0) && (num_chunks > 0) &&
839 bytestream2_get_bytes_left(&g2) >= 4) {
840 int stream_ptr_after_chunk;
841 chunk_size = bytestream2_get_le32(&g2);
842 if (chunk_size > frame_size) {
843 av_log(avctx, AV_LOG_WARNING,
844 "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);
845 chunk_size = frame_size;
847 stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
849 chunk_type = bytestream2_get_le16(&g2);
852 switch (chunk_type) {
855 /* For some reason, it seems that non-palettized flics do
856 * include one of these chunks in their first frame.
857 * Why I do not know, it seems rather extraneous. */
859 "Unexpected Palette chunk %d in non-palettized FLC\n",
861 bytestream2_skip(&g2, chunk_size - 6);
867 compressed_lines = bytestream2_get_le16(&g2);
868 while (compressed_lines > 0) {
869 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
871 if (y_ptr > pixel_limit)
872 return AVERROR_INVALIDDATA;
873 line_packets = bytestream2_get_le16(&g2);
874 if (line_packets < 0) {
875 line_packets = -line_packets;
876 if (line_packets > s->avctx->height)
877 return AVERROR_INVALIDDATA;
878 y_ptr += line_packets * s->frame->linesize[0];
883 pixel_countdown = s->avctx->width;
884 for (i = 0; i < line_packets; i++) {
885 /* account for the skip bytes */
886 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
888 pixel_skip = bytestream2_get_byte(&g2);
889 pixel_ptr += (pixel_skip*3); /* Pixel is 3 bytes wide */
890 pixel_countdown -= pixel_skip;
891 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
893 byte_run = -byte_run;
894 pixel = bytestream2_get_le24(&g2);
895 CHECK_PIXEL_PTR(3 * byte_run);
896 for (j = 0; j < byte_run; j++, pixel_countdown -= 1) {
897 AV_WL24(&pixels[pixel_ptr], pixel);
901 if (bytestream2_tell(&g2) + 2*byte_run > stream_ptr_after_chunk)
903 CHECK_PIXEL_PTR(2 * byte_run);
904 for (j = 0; j < byte_run; j++, pixel_countdown--) {
905 pixel = bytestream2_get_le24(&g2);
906 AV_WL24(&pixels[pixel_ptr], pixel);
912 y_ptr += s->frame->linesize[0];
918 av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-palettized FLC\n");
919 bytestream2_skip(&g2, chunk_size - 6);
923 /* set the whole frame to 0x00 which is black for 24 bit mode. */
925 s->frame->linesize[0] * s->avctx->height);
930 for (lines = 0; lines < s->avctx->height; lines++) {
932 /* disregard the line packets; instead, iterate through all
934 bytestream2_skip(&g2, 1);
935 pixel_countdown = (s->avctx->width * 3);
937 while (pixel_countdown > 0) {
938 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
940 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
942 palette_idx1 = bytestream2_get_byte(&g2);
943 CHECK_PIXEL_PTR(byte_run);
944 for (j = 0; j < byte_run; j++) {
945 pixels[pixel_ptr++] = palette_idx1;
947 if (pixel_countdown < 0)
948 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
949 pixel_countdown, lines);
951 } else { /* copy bytes if byte_run < 0 */
952 byte_run = -byte_run;
953 if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
955 CHECK_PIXEL_PTR(byte_run);
956 for (j = 0; j < byte_run; j++) {
957 palette_idx1 = bytestream2_get_byte(&g2);
958 pixels[pixel_ptr++] = palette_idx1;
960 if (pixel_countdown < 0)
961 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
962 pixel_countdown, lines);
967 y_ptr += s->frame->linesize[0];
973 for (lines = 0; lines < s->avctx->height; lines++) {
975 /* disregard the line packets; instead, iterate through all
977 bytestream2_skip(&g2, 1);
978 pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
980 while (pixel_countdown > 0) {
981 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
983 byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
985 pixel = bytestream2_get_le24(&g2);
986 CHECK_PIXEL_PTR(3 * byte_run);
987 for (j = 0; j < byte_run; j++) {
988 AV_WL24(pixels + pixel_ptr, pixel);
991 if (pixel_countdown < 0)
992 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
995 } else { /* copy pixels if byte_run < 0 */
996 byte_run = -byte_run;
997 if (bytestream2_tell(&g2) + 3 * byte_run > stream_ptr_after_chunk)
999 CHECK_PIXEL_PTR(3 * byte_run);
1000 for (j = 0; j < byte_run; j++) {
1001 pixel = bytestream2_get_le24(&g2);
1002 AV_WL24(pixels + pixel_ptr, pixel);
1005 if (pixel_countdown < 0)
1006 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
1012 y_ptr += s->frame->linesize[0];
1018 /* copy the chunk (uncompressed frame) */
1019 if (chunk_size - 6 > (unsigned int)(FFALIGN(s->avctx->width, 2) * s->avctx->height)*3) {
1020 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
1021 "bigger than image, skipping chunk\n", chunk_size - 6);
1022 bytestream2_skip(&g2, chunk_size - 6);
1024 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;
1025 y_ptr += s->frame->linesize[0]) {
1027 pixel_countdown = s->avctx->width;
1029 while (pixel_countdown > 0) {
1030 pixel = bytestream2_get_le24(&g2);
1031 AV_WL24(&pixels[y_ptr + pixel_ptr], pixel);
1035 if (s->avctx->width & 1)
1036 bytestream2_skip(&g2, 3);
1042 /* some sort of a thumbnail? disregard this chunk... */
1043 bytestream2_skip(&g2, chunk_size - 6);
1047 av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
1051 if (stream_ptr_after_chunk - bytestream2_tell(&g2) >= 0) {
1052 bytestream2_skip(&g2, stream_ptr_after_chunk - bytestream2_tell(&g2));
1054 av_log(avctx, AV_LOG_ERROR, "Chunk overread\n");
1058 frame_size -= chunk_size;
1062 /* by the end of the chunk, the stream ptr should equal the frame
1063 * size (minus 1, possibly); if it doesn't, issue a warning */
1064 if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1))
1065 av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
1066 "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2));
1068 if ((ret = av_frame_ref(data, s->frame)) < 0)
1076 static int flic_decode_frame(AVCodecContext *avctx,
1077 void *data, int *got_frame,
1080 const uint8_t *buf = avpkt->data;
1081 int buf_size = avpkt->size;
1082 if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
1083 return flic_decode_frame_8BPP(avctx, data, got_frame,
1085 } else if ((avctx->pix_fmt == AV_PIX_FMT_RGB555) ||
1086 (avctx->pix_fmt == AV_PIX_FMT_RGB565)) {
1087 return flic_decode_frame_15_16BPP(avctx, data, got_frame,
1089 } else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
1090 return flic_decode_frame_24BPP(avctx, data, got_frame,
1094 /* Should not get here, ever as the pix_fmt is processed */
1095 /* in flic_decode_init and the above if should deal with */
1096 /* the finite set of possibilities allowable by here. */
1097 /* But in case we do, just error out. */
1098 av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");
1103 static av_cold int flic_decode_end(AVCodecContext *avctx)
1105 FlicDecodeContext *s = avctx->priv_data;
1107 av_frame_free(&s->frame);
1112 AVCodec ff_flic_decoder = {
1114 .long_name = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"),
1115 .type = AVMEDIA_TYPE_VIDEO,
1116 .id = AV_CODEC_ID_FLIC,
1117 .priv_data_size = sizeof(FlicDecodeContext),
1118 .init = flic_decode_init,
1119 .close = flic_decode_end,
1120 .decode = flic_decode_frame,
1121 .capabilities = AV_CODEC_CAP_DR1,