FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/nuv.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 122 185 65.9%
Branches: 53 94 56.4%

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 <stdio.h>
23 #include <stdlib.h>
24 #include <limits.h>
25
26 #include "libavutil/bswap.h"
27 #include "libavutil/common.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/lzo.h"
30 #include "libavutil/imgutils.h"
31 #include "avcodec.h"
32 #include "idctdsp.h"
33 #include "internal.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 static const uint8_t fallback_lquant[] = {
48 16, 11, 10, 16, 24, 40, 51, 61,
49 12, 12, 14, 19, 26, 58, 60, 55,
50 14, 13, 16, 24, 40, 57, 69, 56,
51 14, 17, 22, 29, 51, 87, 80, 62,
52 18, 22, 37, 56, 68, 109, 103, 77,
53 24, 35, 55, 64, 81, 104, 113, 92,
54 49, 64, 78, 87, 103, 121, 120, 101,
55 72, 92, 95, 98, 112, 100, 103, 99
56 };
57
58 static const uint8_t fallback_cquant[] = {
59 17, 18, 24, 47, 99, 99, 99, 99,
60 18, 21, 26, 66, 99, 99, 99, 99,
61 24, 26, 56, 99, 99, 99, 99, 99,
62 47, 66, 99, 99, 99, 99, 99, 99,
63 99, 99, 99, 99, 99, 99, 99, 99,
64 99, 99, 99, 99, 99, 99, 99, 99,
65 99, 99, 99, 99, 99, 99, 99, 99,
66 99, 99, 99, 99, 99, 99, 99, 99
67 };
68
69 /**
70 * @brief copy frame data from buffer to AVFrame, handling stride.
71 * @param f destination AVFrame
72 * @param src source buffer, does not use any line-stride
73 * @param width width of the video frame
74 * @param height height of the video frame
75 */
76 static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
77 {
78 uint8_t *src_data[4];
79 int src_linesize[4];
80 av_image_fill_arrays(src_data, src_linesize, src,
81 f->format, width, height, 1);
82 av_image_copy(f->data, f->linesize, (const uint8_t **)src_data, src_linesize,
83 f->format, width, height);
84 }
85
86 /**
87 * @brief extract quantization tables from codec data into our context
88 */
89 4 static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
90 int size)
91 {
92 int i;
93
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4 if (size < 2 * 64 * 4) {
94 av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
95 return AVERROR_INVALIDDATA;
96 }
97
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260 for (i = 0; i < 64; i++, buf += 4)
98 256 c->lq[i] = AV_RL32(buf);
99
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260 for (i = 0; i < 64; i++, buf += 4)
100 256 c->cq[i] = AV_RL32(buf);
101 4 return 0;
102 }
103
104 /**
105 * @brief set quantization tables from a quality value
106 */
107 50 static void get_quant_quality(NuvContext *c, int quality)
108 {
109 int i;
110 50 quality = FFMAX(quality, 1);
111
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3250 for (i = 0; i < 64; i++) {
112 3200 c->lq[i] = (fallback_lquant[i] << 7) / quality;
113 3200 c->cq[i] = (fallback_cquant[i] << 7) / quality;
114 }
115 50 }
116
117 54 static int codec_reinit(AVCodecContext *avctx, int width, int height,
118 int quality)
119 {
120 54 NuvContext *c = avctx->priv_data;
121 int ret;
122
123 54 width = FFALIGN(width, 2);
124 54 height = FFALIGN(height, 2);
125
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54 if (quality >= 0)
126 50 get_quant_quality(c, quality);
127
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54 if (width != c->width || height != c->height) {
128 // also reserve space for a possible additional header
129 4 int64_t buf_size = height * (int64_t)width * 3 / 2
130 + FFMAX(AV_LZO_OUTPUT_PADDING, AV_INPUT_BUFFER_PADDING_SIZE)
131 + RTJPEG_HEADER_SIZE;
132
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4 if (buf_size > INT_MAX/8)
133 return -1;
134
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4 if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
135 return ret;
136 4 c->width = width;
137 4 c->height = height;
138 4 av_fast_malloc(&c->decomp_buf, &c->decomp_size,
139 buf_size);
140
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4 if (!c->decomp_buf) {
141 av_log(avctx, AV_LOG_ERROR,
142 "Can't allocate decompression buffer.\n");
143 return AVERROR(ENOMEM);
144 }
145 4 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
146 4 av_frame_unref(c->pic);
147 4 return 1;
148
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50 } else if (quality != c->quality)
149 50 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
150
151 50 return 0;
152 }
153
154 59 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
155 AVPacket *avpkt)
156 {
157 59 const uint8_t *buf = avpkt->data;
158 59 int buf_size = avpkt->size;
159 59 NuvContext *c = avctx->priv_data;
160 59 AVFrame *picture = data;
161 59 int orig_size = buf_size;
162 int keyframe, ret;
163 59 int size_change = 0;
164 59 int minsize = 0;
165 59 int flags = 0;
166 59 int result, init_frame = !avctx->frame_number;
167 enum {
168 NUV_UNCOMPRESSED = '0',
169 NUV_RTJPEG = '1',
170 NUV_RTJPEG_IN_LZO = '2',
171 NUV_LZO = '3',
172 NUV_BLACK = 'N',
173 NUV_COPY_LAST = 'L'
174 } comptype;
175
176
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59 if (buf_size < 12) {
177 av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
178 return AVERROR_INVALIDDATA;
179 }
180
181 // codec data (rtjpeg quant tables)
182
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59 if (buf[0] == 'D' && buf[1] == 'R') {
183 int ret;
184 // Skip the rest of the frame header.
185 buf = &buf[12];
186 buf_size -= 12;
187 ret = get_quant(avctx, c, buf, buf_size);
188 if (ret < 0)
189 return ret;
190 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
191 return orig_size;
192 }
193
194
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59 if (buf_size < 12 || buf[0] != 'V') {
195 av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
196 return AVERROR_INVALIDDATA;
197 }
198 59 comptype = buf[1];
199
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59 switch (comptype) {
200 58 case NUV_RTJPEG_IN_LZO:
201 case NUV_RTJPEG:
202 58 keyframe = !buf[2];
203
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58 if (c->width < 16 || c->height < 16) {
204 return AVERROR_INVALIDDATA;
205 }
206 58 break;
207 1 case NUV_COPY_LAST:
208 1 flags |= FF_REGET_BUFFER_FLAG_READONLY;
209 1 keyframe = 0;
210 1 break;
211 default:
212 keyframe = 1;
213 break;
214 }
215
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59 switch (comptype) {
216 case NUV_UNCOMPRESSED:
217 minsize = c->width * c->height * 3 / 2;
218 break;
219 case NUV_RTJPEG:
220 minsize = c->width/16 * (c->height/16) * 6;
221 break;
222 59 case NUV_BLACK:
223 case NUV_COPY_LAST:
224 case NUV_LZO:
225 case NUV_RTJPEG_IN_LZO:
226 59 break;
227 default:
228 av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
229 return AVERROR_INVALIDDATA;
230 }
231
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59 if (buf_size < minsize / 4)
232 return AVERROR_INVALIDDATA;
233 59 retry:
234 // Skip the rest of the frame header.
235 59 buf = &buf[12];
236 59 buf_size -= 12;
237
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59 if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
238 58 int outlen = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING);
239 58 int inlen = buf_size;
240
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58 if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
241 1 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
242 1 return AVERROR_INVALIDDATA;
243 }
244 57 buf = c->decomp_buf;
245 57 buf_size = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING) - outlen;
246 57 memset(c->decomp_buf + buf_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
247 }
248
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58 if (c->codec_frameheader) {
249 int w, h, q;
250
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50 if (buf_size < RTJPEG_HEADER_SIZE) {
251 av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n");
252 return AVERROR_INVALIDDATA;
253 }
254 // There seem to exist two variants of this header: one starts with 'V'
255 // and 5 bytes unknown, the other matches current MythTV and is 4 bytes size,
256 // 1 byte header size (== 12), 1 byte version (== 0)
257
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50 if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) {
258 av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\n");
259 return AVERROR_INVALIDDATA;
260 }
261 50 w = AV_RL16(&buf[6]);
262 50 h = AV_RL16(&buf[8]);
263 50 q = buf[10];
264
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50 if ((result = codec_reinit(avctx, w, h, q)) < 0)
265 return result;
266
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50 if (result) {
267 buf = avpkt->data;
268 buf_size = avpkt->size;
269 size_change = 1;
270 goto retry;
271 }
272 50 buf = &buf[RTJPEG_HEADER_SIZE];
273 50 buf_size -= RTJPEG_HEADER_SIZE;
274 }
275
276
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58 if (size_change || keyframe) {
277 3 av_frame_unref(c->pic);
278 3 init_frame = 1;
279 }
280
281
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58 if ((result = ff_reget_buffer(avctx, c->pic, flags)) < 0)
282 return result;
283
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58 if (init_frame) {
284 3 memset(c->pic->data[0], 0, avctx->height * c->pic->linesize[0]);
285 3 memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2);
286 3 memset(c->pic->data[2], 0x80, avctx->height * c->pic->linesize[2] / 2);
287 }
288
289
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58 c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
290 58 c->pic->key_frame = keyframe;
291 // decompress/copy/whatever data
292
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58 switch (comptype) {
293 case NUV_LZO:
294 case NUV_UNCOMPRESSED: {
295 int height = c->height;
296 if (buf_size < c->width * height * 3 / 2) {
297 av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
298 height = buf_size / c->width / 3 * 2;
299 }
300 if(height > 0)
301 copy_frame(c->pic, buf, c->width, height);
302 break;
303 }
304 57 case NUV_RTJPEG_IN_LZO:
305 case NUV_RTJPEG:
306 57 ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
307
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57 if (ret < 0)
308 return ret;
309 57 break;
310 case NUV_BLACK:
311 memset(c->pic->data[0], 0, c->width * c->height);
312 memset(c->pic->data[1], 128, c->width * c->height / 4);
313 memset(c->pic->data[2], 128, c->width * c->height / 4);
314 break;
315 1 case NUV_COPY_LAST:
316 /* nothing more to do here */
317 1 break;
318 }
319
320
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58 if ((result = av_frame_ref(picture, c->pic)) < 0)
321 return result;
322
323 58 *got_frame = 1;
324 58 return orig_size;
325 }
326
327 4 static av_cold int decode_init(AVCodecContext *avctx)
328 {
329 4 NuvContext *c = avctx->priv_data;
330 int ret;
331
332 4 c->pic = av_frame_alloc();
333
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4 if (!c->pic)
334 return AVERROR(ENOMEM);
335
336 4 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
337 4 c->decomp_buf = NULL;
338 4 c->quality = -1;
339 4 c->width = 0;
340 4 c->height = 0;
341
342 4 c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
343
344
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4 if (avctx->extradata_size)
345 4 get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
346
347 4 ff_rtjpeg_init(&c->rtj, avctx);
348
349
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4 if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
350 return ret;
351
352 4 return 0;
353 }
354
355 4 static av_cold int decode_end(AVCodecContext *avctx)
356 {
357 4 NuvContext *c = avctx->priv_data;
358
359 4 av_freep(&c->decomp_buf);
360 4 av_frame_free(&c->pic);
361
362 4 return 0;
363 }
364
365 const AVCodec ff_nuv_decoder = {
366 .name = "nuv",
367 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
368 .type = AVMEDIA_TYPE_VIDEO,
369 .id = AV_CODEC_ID_NUV,
370 .priv_data_size = sizeof(NuvContext),
371 .init = decode_init,
372 .close = decode_end,
373 .decode = decode_frame,
374 .capabilities = AV_CODEC_CAP_DR1,
375 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
376 };
377