FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/nuv.c
Date: 2026-01-23 14:02:51
Exec Total Coverage
Lines: 123 187 65.8%
Functions: 6 7 85.7%
Branches: 55 96 57.3%
Line Branch Exec Source
1 /*
2 * NuppelVideo decoder
3 * Copyright (c) 2006 Reimar Doeffinger
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 #include <stddef.h>
23 #include <limits.h>
24
25 #include "libavutil/common.h"
26 #include "libavutil/intreadwrite.h"
27 #include "libavutil/lzo.h"
28 #include "libavutil/imgutils.h"
29 #include "libavutil/mem.h"
30 #include "avcodec.h"
31 #include "codec_internal.h"
32 #include "decode.h"
33 #include "jpegquanttables.h"
34 #include "rtjpeg.h"
35
36 typedef struct NuvContext {
37 AVFrame *pic;
38 int codec_frameheader;
39 int quality;
40 int width, height;
41 unsigned int decomp_size;
42 unsigned char *decomp_buf;
43 uint32_t lq[64], cq[64];
44 RTJpegContext rtj;
45 } NuvContext;
46
47 /**
48 * @brief copy frame data from buffer to AVFrame, handling stride.
49 * @param f destination AVFrame
50 * @param src source buffer, does not use any line-stride
51 * @param width width of the video frame
52 * @param height height of the video frame
53 */
54 ✗ static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
55 {
56 uint8_t *src_data[4];
57 int src_linesize[4];
58 ✗ av_image_fill_arrays(src_data, src_linesize, src,
59 ✗ f->format, width, height, 1);
60 ✗ av_image_copy2(f->data, f->linesize, src_data, src_linesize,
61 ✗ f->format, width, height);
62 ✗ }
63
64 /**
65 * @brief extract quantization tables from codec data into our context
66 */
67 4 static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
68 int size)
69 {
70 int i;
71
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 4 if (size < 2 * 64 * 4) {
72 ✗ av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
73 ✗ return AVERROR_INVALIDDATA;
74 }
75
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 260 for (i = 0; i < 64; i++, buf += 4)
76 256 c->lq[i] = AV_RL32(buf);
77
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 260 for (i = 0; i < 64; i++, buf += 4)
78 256 c->cq[i] = AV_RL32(buf);
79 4 return 0;
80 }
81
82 /**
83 * @brief set quantization tables from a quality value
84 */
85 50 static void get_quant_quality(NuvContext *c, int quality)
86 {
87 int i;
88 50 quality = FFMAX(quality, 1);
89
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 3250 for (i = 0; i < 64; i++) {
90 3200 c->lq[i] = (ff_mjpeg_std_luminance_quant_tbl[i] << 7) / quality;
91 3200 c->cq[i] = (ff_mjpeg_std_chrominance_quant_tbl[i] << 7) / quality;
92 }
93 50 }
94
95 54 static int codec_reinit(AVCodecContext *avctx, int width, int height,
96 int quality)
97 {
98 54 NuvContext *c = avctx->priv_data;
99 int ret;
100
101 54 width = FFALIGN(width, 2);
102 54 height = FFALIGN(height, 2);
103
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 54 if (quality >= 0)
104 50 get_quant_quality(c, quality);
105
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 54 if (width != c->width || height != c->height) {
106 // also reserve space for a possible additional header
107 4 int64_t buf_size = height * (int64_t)width * 3 / 2
108 + FFMAX(AV_LZO_OUTPUT_PADDING, AV_INPUT_BUFFER_PADDING_SIZE)
109 + RTJPEG_HEADER_SIZE;
110
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 4 if (buf_size > INT_MAX/8)
111 ✗ return -1;
112
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 4 if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
113 ✗ return ret;
114 4 c->width = width;
115 4 c->height = height;
116 4 av_fast_malloc(&c->decomp_buf, &c->decomp_size,
117 buf_size);
118
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 4 if (!c->decomp_buf) {
119 ✗ av_log(avctx, AV_LOG_ERROR,
120 "Can't allocate decompression buffer.\n");
121 ✗ return AVERROR(ENOMEM);
122 }
123 4 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
124 4 av_frame_unref(c->pic);
125 4 return 1;
126
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 50 } else if (quality != c->quality)
127 50 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
128
129 50 return 0;
130 }
131
132 59 static int decode_frame(AVCodecContext *avctx, AVFrame *picture,
133 int *got_frame, AVPacket *avpkt)
134 {
135 59 const uint8_t *buf = avpkt->data;
136 59 int buf_size = avpkt->size;
137 59 NuvContext *c = avctx->priv_data;
138 59 int orig_size = buf_size;
139 int keyframe, ret;
140 59 int size_change = 0;
141 59 int minsize = 0;
142 59 int flags = 0;
143 59 int result, init_frame = !avctx->frame_num;
144 enum {
145 NUV_UNCOMPRESSED = '0',
146 NUV_RTJPEG = '1',
147 NUV_RTJPEG_IN_LZO = '2',
148 NUV_LZO = '3',
149 NUV_BLACK = 'N',
150 NUV_COPY_LAST = 'L'
151 } comptype;
152
153
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 59 if (buf_size < 12) {
154 ✗ av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
155 ✗ return AVERROR_INVALIDDATA;
156 }
157
158 // codec data (rtjpeg quant tables)
159
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 59 if (buf[0] == 'D' && buf[1] == 'R') {
160 int ret;
161 // Skip the rest of the frame header.
162 ✗ buf = &buf[12];
163 ✗ buf_size -= 12;
164 ✗ ret = get_quant(avctx, c, buf, buf_size);
165 ✗ if (ret < 0)
166 ✗ return ret;
167 ✗ ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
168 ✗ return orig_size;
169 }
170
171
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 59 if (buf_size < 12 || buf[0] != 'V') {
172 ✗ av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
173 ✗ return AVERROR_INVALIDDATA;
174 }
175 59 comptype = buf[1];
176
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 59 switch (comptype) {
177 58 case NUV_RTJPEG_IN_LZO:
178 case NUV_RTJPEG:
179 58 keyframe = !buf[2];
180
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 58 if (c->width < 16 || c->height < 16) {
181 ✗ return AVERROR_INVALIDDATA;
182 }
183 58 break;
184 1 case NUV_COPY_LAST:
185 1 flags |= FF_REGET_BUFFER_FLAG_READONLY;
186 1 keyframe = 0;
187 1 break;
188 ✗ default:
189 ✗ keyframe = 1;
190 ✗ break;
191 }
192
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 59 switch (comptype) {
193 ✗ case NUV_UNCOMPRESSED:
194 ✗ minsize = c->width * c->height * 3 / 2;
195 ✗ break;
196 ✗ case NUV_RTJPEG:
197 ✗ minsize = c->width/16 * (c->height/16) * 6;
198 ✗ break;
199 59 case NUV_BLACK:
200 case NUV_COPY_LAST:
201 case NUV_LZO:
202 case NUV_RTJPEG_IN_LZO:
203 59 break;
204 ✗ default:
205 ✗ av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
206 ✗ return AVERROR_INVALIDDATA;
207 }
208
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 59 if (buf_size < minsize / 4)
209 ✗ return AVERROR_INVALIDDATA;
210 59 retry:
211 // Skip the rest of the frame header.
212 59 buf = &buf[12];
213 59 buf_size -= 12;
214
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 59 if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
215 58 int outlen = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING);
216 58 int inlen = buf_size;
217
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 58 if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
218 1 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
219 1 return AVERROR_INVALIDDATA;
220 }
221 57 buf = c->decomp_buf;
222 57 buf_size = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING) - outlen;
223 57 memset(c->decomp_buf + buf_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
224 }
225
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 58 if (c->codec_frameheader) {
226 int w, h, q;
227
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 50 if (buf_size < RTJPEG_HEADER_SIZE) {
228 ✗ av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n");
229 ✗ return AVERROR_INVALIDDATA;
230 }
231 // There seem to exist two variants of this header: one starts with 'V'
232 // and 5 bytes unknown, the other matches current MythTV and is 4 bytes size,
233 // 1 byte header size (== 12), 1 byte version (== 0)
234
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 50 if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) {
235 ✗ av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\n");
236 ✗ return AVERROR_INVALIDDATA;
237 }
238 50 w = AV_RL16(&buf[6]);
239 50 h = AV_RL16(&buf[8]);
240 50 q = buf[10];
241
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 50 if ((result = codec_reinit(avctx, w, h, q)) < 0)
242 ✗ return result;
243
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 50 if (result) {
244 ✗ buf = avpkt->data;
245 ✗ buf_size = avpkt->size;
246 ✗ size_change = 1;
247 ✗ goto retry;
248 }
249 50 buf = &buf[RTJPEG_HEADER_SIZE];
250 50 buf_size -= RTJPEG_HEADER_SIZE;
251 }
252
253
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 58 if (size_change || keyframe) {
254 3 av_frame_unref(c->pic);
255 3 init_frame = 1;
256 }
257
258
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 58 if ((result = ff_reget_buffer(avctx, c->pic, flags)) < 0)
259 ✗ return result;
260
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 58 if (init_frame) {
261 3 memset(c->pic->data[0], 0, avctx->height * c->pic->linesize[0]);
262 3 memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2);
263 3 memset(c->pic->data[2], 0x80, avctx->height * c->pic->linesize[2] / 2);
264 }
265
266
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 58 c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
267
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 58 if (keyframe)
268 3 c->pic->flags |= AV_FRAME_FLAG_KEY;
269 else
270 55 c->pic->flags &= ~AV_FRAME_FLAG_KEY;
271 // decompress/copy/whatever data
272
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 58 switch (comptype) {
273 ✗ case NUV_LZO:
274 case NUV_UNCOMPRESSED: {
275 ✗ int height = c->height;
276 ✗ if (buf_size < c->width * height * 3 / 2) {
277 ✗ av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
278 ✗ height = buf_size / c->width / 3 * 2;
279 }
280 ✗ if(height > 0)
281 ✗ copy_frame(c->pic, buf, c->width, height);
282 ✗ break;
283 }
284 57 case NUV_RTJPEG_IN_LZO:
285 case NUV_RTJPEG:
286 57 ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
287
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 57 if (ret < 0)
288 ✗ return ret;
289 57 break;
290 ✗ case NUV_BLACK:
291 ✗ memset(c->pic->data[0], 0, c->width * c->height);
292 ✗ memset(c->pic->data[1], 128, c->width * c->height / 4);
293 ✗ memset(c->pic->data[2], 128, c->width * c->height / 4);
294 ✗ break;
295 1 case NUV_COPY_LAST:
296 /* nothing more to do here */
297 1 break;
298 }
299
300
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 58 if ((result = av_frame_ref(picture, c->pic)) < 0)
301 ✗ return result;
302
303 58 *got_frame = 1;
304 58 return orig_size;
305 }
306
307 4 static av_cold int decode_init(AVCodecContext *avctx)
308 {
309 4 NuvContext *c = avctx->priv_data;
310 int ret;
311
312 4 c->pic = av_frame_alloc();
313
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 4 if (!c->pic)
314 ✗ return AVERROR(ENOMEM);
315
316 4 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
317 4 c->decomp_buf = NULL;
318 4 c->quality = -1;
319 4 c->width = 0;
320 4 c->height = 0;
321
322 4 c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
323
324
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 4 if (avctx->extradata_size)
325 4 get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
326
327 4 ff_rtjpeg_init(&c->rtj, avctx);
328
329
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 4 if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
330 ✗ return ret;
331
332 4 return 0;
333 }
334
335 4 static av_cold int decode_end(AVCodecContext *avctx)
336 {
337 4 NuvContext *c = avctx->priv_data;
338
339 4 av_freep(&c->decomp_buf);
340 4 av_frame_free(&c->pic);
341
342 4 return 0;
343 }
344
345 const FFCodec ff_nuv_decoder = {
346 .p.name = "nuv",
347 CODEC_LONG_NAME("NuppelVideo/RTJPEG"),
348 .p.type = AVMEDIA_TYPE_VIDEO,
349 .p.id = AV_CODEC_ID_NUV,
350 .priv_data_size = sizeof(NuvContext),
351 .init = decode_init,
352 .close = decode_end,
353 FF_CODEC_DECODE_CB(decode_frame),
354 .p.capabilities = AV_CODEC_CAP_DR1,
355 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
356 };
357