FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/rscc.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 119 177 67.2%
Branches: 51 83 61.4%

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1 /*
2 * innoHeim/Rsupport Screen Capture Codec
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 * innoHeim/Rsupport Screen Capture Codec decoder
25 *
26 * Fourcc: ISCC, RSCC
27 *
28 * Lossless codec, data stored in tiles, with optional deflate compression.
29 *
30 * Header contains the number of tiles in a frame with the tile coordinates,
31 * and it can be deflated or not. Similarly, pixel data comes after the header
32 * and a variable size value, and it can be deflated or just raw.
33 *
34 * Supports: PAL8, BGRA, BGR24, RGB555
35 */
36
37 #include <stdint.h>
38 #include <string.h>
39 #include <zlib.h>
40
41 #include "libavutil/imgutils.h"
42 #include "libavutil/internal.h"
43
44 #include "avcodec.h"
45 #include "bytestream.h"
46 #include "codec_internal.h"
47 #include "decode.h"
48
49 #define TILE_SIZE 8
50
51 typedef struct Tile {
52 int x, y;
53 int w, h;
54 } Tile;
55
56 typedef struct RsccContext {
57 GetByteContext gbc;
58 AVFrame *reference;
59 Tile *tiles;
60 unsigned int tiles_size;
61 int component_size;
62
63 uint8_t palette[AVPALETTE_SIZE];
64
65 /* zlib interaction */
66 uint8_t *inflated_buf;
67 uLongf inflated_size;
68 int valid_pixels;
69 } RsccContext;
70
71 10 static av_cold int rscc_init(AVCodecContext *avctx)
72 {
73 10 RsccContext *ctx = avctx->priv_data;
74
75 /* These needs to be set to estimate uncompressed buffer */
76 10 int ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
77
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10 if (ret < 0) {
78 av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
79 avctx->width, avctx->height);
80 return ret;
81 }
82
83 /* Allocate reference frame */
84 10 ctx->reference = av_frame_alloc();
85
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10 if (!ctx->reference)
86 return AVERROR(ENOMEM);
87
88 /* Get pixel format and the size of the pixel */
89
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10 if (avctx->codec_tag == MKTAG('I', 'S', 'C', 'C')) {
90
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2 if (avctx->extradata && avctx->extradata_size == 4) {
91
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2 if ((avctx->extradata[0] >> 1) & 1) {
92 2 avctx->pix_fmt = AV_PIX_FMT_BGRA;
93 2 ctx->component_size = 4;
94 } else {
95 avctx->pix_fmt = AV_PIX_FMT_BGR24;
96 ctx->component_size = 3;
97 }
98 } else {
99 avctx->pix_fmt = AV_PIX_FMT_BGRA;
100 ctx->component_size = 4;
101 }
102
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8 } else if (avctx->codec_tag == MKTAG('R', 'S', 'C', 'C')) {
103 8 ctx->component_size = avctx->bits_per_coded_sample / 8;
104
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8 switch (avctx->bits_per_coded_sample) {
105 2 case 8:
106 2 avctx->pix_fmt = AV_PIX_FMT_PAL8;
107 2 break;
108 2 case 16:
109 2 avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
110 2 break;
111 2 case 24:
112 2 avctx->pix_fmt = AV_PIX_FMT_BGR24;
113 2 break;
114 2 case 32:
115 2 avctx->pix_fmt = AV_PIX_FMT_BGR0;
116 2 break;
117 default:
118 av_log(avctx, AV_LOG_ERROR, "Invalid bits per pixel value (%d)\n",
119 avctx->bits_per_coded_sample);
120 return AVERROR_INVALIDDATA;
121 }
122 } else {
123 avctx->pix_fmt = AV_PIX_FMT_BGR0;
124 ctx->component_size = 4;
125 av_log(avctx, AV_LOG_WARNING, "Invalid codec tag\n");
126 }
127
128 /* Store the value to check for keyframes */
129 10 ctx->inflated_size = avctx->width * avctx->height * ctx->component_size;
130
131 /* Allocate maximum size possible, a full frame */
132 10 ctx->inflated_buf = av_malloc(ctx->inflated_size);
133
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10 if (!ctx->inflated_buf)
134 return AVERROR(ENOMEM);
135
136 10 return 0;
137 }
138
139 10 static av_cold int rscc_close(AVCodecContext *avctx)
140 {
141 10 RsccContext *ctx = avctx->priv_data;
142
143 10 av_freep(&ctx->tiles);
144 10 av_freep(&ctx->inflated_buf);
145 10 av_frame_free(&ctx->reference);
146
147 10 return 0;
148 }
149
150 32 static int rscc_decode_frame(AVCodecContext *avctx, AVFrame *frame,
151 int *got_frame, AVPacket *avpkt)
152 {
153 32 RsccContext *ctx = avctx->priv_data;
154 32 GetByteContext *gbc = &ctx->gbc;
155 GetByteContext tiles_gbc;
156 const uint8_t *pixels, *raw;
157 32 uint8_t *inflated_tiles = NULL;
158 32 int tiles_nb, packed_size, pixel_size = 0;
159 32 int i, ret = 0;
160
161 32 bytestream2_init(gbc, avpkt->data, avpkt->size);
162
163 /* Size check */
164
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32 if (bytestream2_get_bytes_left(gbc) < 12) {
165 av_log(avctx, AV_LOG_ERROR, "Packet too small (%d)\n", avpkt->size);
166 return AVERROR_INVALIDDATA;
167 }
168
169 /* Read number of tiles, and allocate the array */
170 32 tiles_nb = bytestream2_get_le16(gbc);
171
172
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32 if (tiles_nb == 0) {
173 av_log(avctx, AV_LOG_DEBUG, "no tiles\n");
174 return avpkt->size;
175 }
176
177 32 av_fast_malloc(&ctx->tiles, &ctx->tiles_size,
178 tiles_nb * sizeof(*ctx->tiles));
179
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32 if (!ctx->tiles) {
180 ret = AVERROR(ENOMEM);
181 goto end;
182 }
183
184 32 av_log(avctx, AV_LOG_DEBUG, "Frame with %d tiles.\n", tiles_nb);
185
186 /* When there are more than 5 tiles, they are packed together with
187 * a size header. When that size does not match the number of tiles
188 * times the tile size, it means it needs to be inflated as well */
189
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32 if (tiles_nb > 5) {
190 uLongf packed_tiles_size;
191
192
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24 if (tiles_nb < 32)
193 17 packed_tiles_size = bytestream2_get_byte(gbc);
194 else
195 7 packed_tiles_size = bytestream2_get_le16(gbc);
196
197 ff_dlog(avctx, "packed tiles of size %lu.\n", packed_tiles_size);
198
199 /* If necessary, uncompress tiles, and hijack the bytestream reader */
200
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24 if (packed_tiles_size != tiles_nb * TILE_SIZE) {
201 24 uLongf length = tiles_nb * TILE_SIZE;
202
203
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24 if (bytestream2_get_bytes_left(gbc) < packed_tiles_size) {
204 ret = AVERROR_INVALIDDATA;
205 goto end;
206 }
207
208 24 inflated_tiles = av_malloc(length);
209
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24 if (!inflated_tiles) {
210 ret = AVERROR(ENOMEM);
211 goto end;
212 }
213
214 24 ret = uncompress(inflated_tiles, &length,
215 24 gbc->buffer, packed_tiles_size);
216
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24 if (ret) {
217 av_log(avctx, AV_LOG_ERROR, "Tile deflate error %d.\n", ret);
218 ret = AVERROR_UNKNOWN;
219 goto end;
220 }
221
222 /* Skip the compressed tile section in the main byte reader,
223 * and point it to read the newly uncompressed data */
224 24 bytestream2_skip(gbc, packed_tiles_size);
225 24 bytestream2_init(&tiles_gbc, inflated_tiles, length);
226 24 gbc = &tiles_gbc;
227 }
228 }
229
230 /* Fill in array of tiles, keeping track of how many pixels are updated */
231
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712 for (i = 0; i < tiles_nb; i++) {
232 680 ctx->tiles[i].x = bytestream2_get_le16(gbc);
233 680 ctx->tiles[i].w = bytestream2_get_le16(gbc);
234 680 ctx->tiles[i].y = bytestream2_get_le16(gbc);
235 680 ctx->tiles[i].h = bytestream2_get_le16(gbc);
236
237
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680 if (pixel_size + ctx->tiles[i].w * (int64_t)ctx->tiles[i].h * ctx->component_size > INT_MAX) {
238 av_log(avctx, AV_LOG_ERROR, "Invalid tile dimensions\n");
239 ret = AVERROR_INVALIDDATA;
240 goto end;
241 }
242
243 680 pixel_size += ctx->tiles[i].w * ctx->tiles[i].h * ctx->component_size;
244
245 ff_dlog(avctx, "tile %d orig(%d,%d) %dx%d.\n", i,
246 ctx->tiles[i].x, ctx->tiles[i].y,
247 ctx->tiles[i].w, ctx->tiles[i].h);
248
249
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680 if (ctx->tiles[i].w == 0 || ctx->tiles[i].h == 0) {
250 av_log(avctx, AV_LOG_ERROR,
251 "invalid tile %d at (%d.%d) with size %dx%d.\n", i,
252 ctx->tiles[i].x, ctx->tiles[i].y,
253 ctx->tiles[i].w, ctx->tiles[i].h);
254 ret = AVERROR_INVALIDDATA;
255 goto end;
256
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680 } else if (ctx->tiles[i].x + ctx->tiles[i].w > avctx->width ||
257
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680 ctx->tiles[i].y + ctx->tiles[i].h > avctx->height) {
258 av_log(avctx, AV_LOG_ERROR,
259 "out of bounds tile %d at (%d.%d) with size %dx%d.\n", i,
260 ctx->tiles[i].x, ctx->tiles[i].y,
261 ctx->tiles[i].w, ctx->tiles[i].h);
262 ret = AVERROR_INVALIDDATA;
263 goto end;
264 }
265 }
266
267 /* Reset the reader in case it had been modified before */
268 32 gbc = &ctx->gbc;
269
270 /* Extract how much pixel data the tiles contain */
271
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32 if (pixel_size < 0x100)
272 packed_size = bytestream2_get_byte(gbc);
273
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32 else if (pixel_size < 0x10000)
274 packed_size = bytestream2_get_le16(gbc);
275
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32 else if (pixel_size < 0x1000000)
276 32 packed_size = bytestream2_get_le24(gbc);
277 else
278 packed_size = bytestream2_get_le32(gbc);
279
280 ff_dlog(avctx, "pixel_size %d packed_size %d.\n", pixel_size, packed_size);
281
282
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32 if (packed_size < 0) {
283 av_log(avctx, AV_LOG_ERROR, "Invalid tile size %d\n", packed_size);
284 ret = AVERROR_INVALIDDATA;
285 goto end;
286 }
287
288 /* Get pixels buffer, it may be deflated or just raw */
289
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32 if (pixel_size == packed_size) {
290 if (bytestream2_get_bytes_left(gbc) < pixel_size) {
291 av_log(avctx, AV_LOG_ERROR, "Insufficient input for %d\n", pixel_size);
292 ret = AVERROR_INVALIDDATA;
293 goto end;
294 }
295 pixels = gbc->buffer;
296 } else {
297 32 uLongf len = ctx->inflated_size;
298
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32 if (bytestream2_get_bytes_left(gbc) < packed_size) {
299 2 av_log(avctx, AV_LOG_ERROR, "Insufficient input for %d\n", packed_size);
300 2 ret = AVERROR_INVALIDDATA;
301 2 goto end;
302 }
303
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30 if (ctx->inflated_size < pixel_size) {
304 ret = AVERROR_INVALIDDATA;
305 goto end;
306 }
307 30 ret = uncompress(ctx->inflated_buf, &len, gbc->buffer, packed_size);
308
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30 if (ret) {
309 av_log(avctx, AV_LOG_ERROR, "Pixel deflate error %d.\n", ret);
310 ret = AVERROR_UNKNOWN;
311 goto end;
312 }
313 30 pixels = ctx->inflated_buf;
314 }
315
316 /* Allocate when needed */
317 30 ret = ff_reget_buffer(avctx, ctx->reference, 0);
318
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30 if (ret < 0)
319 goto end;
320
321 /* Pointer to actual pixels, will be updated when data is consumed */
322 30 raw = pixels;
323
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694 for (i = 0; i < tiles_nb; i++) {
324 664 uint8_t *dst = ctx->reference->data[0] + ctx->reference->linesize[0] *
325 664 (avctx->height - ctx->tiles[i].y - 1) +
326 664 ctx->tiles[i].x * ctx->component_size;
327 664 av_image_copy_plane(dst, -1 * ctx->reference->linesize[0],
328 664 raw, ctx->tiles[i].w * ctx->component_size,
329 664 ctx->tiles[i].w * ctx->component_size,
330 664 ctx->tiles[i].h);
331 664 raw += ctx->tiles[i].w * ctx->component_size * ctx->tiles[i].h;
332 }
333
334 /* Frame is ready to be output */
335 30 ret = av_frame_ref(frame, ctx->reference);
336
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30 if (ret < 0)
337 goto end;
338
339 /* Keyframe when the number of pixels updated matches the whole surface */
340
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30 if (pixel_size == ctx->inflated_size) {
341 5 frame->pict_type = AV_PICTURE_TYPE_I;
342 5 frame->key_frame = 1;
343 } else {
344 25 frame->pict_type = AV_PICTURE_TYPE_P;
345 }
346
347 /* Palette handling */
348
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30 if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
349 1 frame->palette_has_changed = ff_copy_palette(ctx->palette, avpkt, avctx);
350 1 memcpy(frame->data[1], ctx->palette, AVPALETTE_SIZE);
351 }
352 // We only return a picture when enough of it is undamaged, this avoids copying nearly broken frames around
353
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30 if (ctx->valid_pixels < ctx->inflated_size)
354 5 ctx->valid_pixels += pixel_size;
355
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30 if (ctx->valid_pixels >= ctx->inflated_size * (100 - avctx->discard_damaged_percentage) / 100)
356 30 *got_frame = 1;
357
358 30 ret = avpkt->size;
359 32 end:
360 32 av_free(inflated_tiles);
361 32 return ret;
362 }
363
364 const FFCodec ff_rscc_decoder = {
365 .p.name = "rscc",
366 CODEC_LONG_NAME("innoHeim/Rsupport Screen Capture Codec"),
367 .p.type = AVMEDIA_TYPE_VIDEO,
368 .p.id = AV_CODEC_ID_RSCC,
369 .init = rscc_init,
370 FF_CODEC_DECODE_CB(rscc_decode_frame),
371 .close = rscc_close,
372 .priv_data_size = sizeof(RsccContext),
373 .p.capabilities = AV_CODEC_CAP_DR1,
374 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
375 };
376