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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 { | |
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 | AVPicture pic; | |
79 | avpicture_fill(&pic, src, AV_PIX_FMT_YUV420P, width, height); | |
80 | av_picture_copy((AVPicture *)f, &pic, AV_PIX_FMT_YUV420P, width, height); | |
81 | } | |
82 | ||
83 | /** | |
84 | * @brief extract quantization tables from codec data into our context | |
85 | */ | |
86 | static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf, | |
87 | int size) | |
88 | { | |
89 | int i; | |
90 | if (size < 2 * 64 * 4) { | |
91 | av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n"); | |
92 | return AVERROR_INVALIDDATA; | |
93 | } | |
94 | for (i = 0; i < 64; i++, buf += 4) | |
95 | c->lq[i] = AV_RL32(buf); | |
96 | for (i = 0; i < 64; i++, buf += 4) | |
97 | c->cq[i] = AV_RL32(buf); | |
98 | return 0; | |
99 | } | |
100 | ||
101 | /** | |
102 | * @brief set quantization tables from a quality value | |
103 | */ | |
104 | static void get_quant_quality(NuvContext *c, int quality) | |
105 | { | |
106 | int i; | |
107 | quality = FFMAX(quality, 1); | |
108 | for (i = 0; i < 64; i++) { | |
109 | c->lq[i] = (fallback_lquant[i] << 7) / quality; | |
110 | c->cq[i] = (fallback_cquant[i] << 7) / quality; | |
111 | } | |
112 | } | |
113 | ||
114 | static int codec_reinit(AVCodecContext *avctx, int width, int height, | |
115 | int quality) | |
116 | { | |
117 | NuvContext *c = avctx->priv_data; | |
118 | int ret; | |
119 | ||
120 | width = FFALIGN(width, 2); | |
121 | height = FFALIGN(height, 2); | |
122 | if (quality >= 0) | |
123 | get_quant_quality(c, quality); | |
124 | if (width != c->width || height != c->height) { | |
125 | // also reserve space for a possible additional header | |
126 | int buf_size = height * width * 3 / 2 | |
127 | + FFMAX(AV_LZO_OUTPUT_PADDING, FF_INPUT_BUFFER_PADDING_SIZE) | |
128 | + RTJPEG_HEADER_SIZE; | |
129 | if (buf_size > INT_MAX/8) | |
130 | return -1; | |
131 | if ((ret = av_image_check_size(height, width, 0, avctx)) < 0) | |
132 | return ret; | |
133 | avctx->width = c->width = width; | |
134 | avctx->height = c->height = height; | |
135 | av_fast_malloc(&c->decomp_buf, &c->decomp_size, | |
136 | buf_size); | |
137 | if (!c->decomp_buf) { | |
138 | av_log(avctx, AV_LOG_ERROR, | |
139 | "Can't allocate decompression buffer.\n"); | |
140 | return AVERROR(ENOMEM); | |
141 | } | |
142 | ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq); | |
143 | av_frame_unref(c->pic); | |
144 | return 1; | |
145 | } else if (quality != c->quality) | |
146 | ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq); | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
151 | static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, | |
152 | AVPacket *avpkt) | |
153 | { | |
154 | const uint8_t *buf = avpkt->data; | |
155 | int buf_size = avpkt->size; | |
156 | NuvContext *c = avctx->priv_data; | |
157 | AVFrame *picture = data; | |
158 | int orig_size = buf_size; | |
159 | int keyframe, ret; | |
160 | int size_change = 0; | |
161 | int result, init_frame = !avctx->frame_number; | |
162 | enum { | |
163 | NUV_UNCOMPRESSED = '0', | |
164 | NUV_RTJPEG = '1', | |
165 | NUV_RTJPEG_IN_LZO = '2', | |
166 | NUV_LZO = '3', | |
167 | NUV_BLACK = 'N', | |
168 | NUV_COPY_LAST = 'L' | |
169 | } comptype; | |
170 | ||
171 | if (buf_size < 12) { | |
172 | av_log(avctx, AV_LOG_ERROR, "coded frame too small\n"); | |
173 | return AVERROR_INVALIDDATA; | |
174 | } | |
175 | ||
176 | // codec data (rtjpeg quant tables) | |
177 | if (buf[0] == 'D' && buf[1] == 'R') { | |
178 | int ret; | |
179 | // skip rest of the frameheader. | |
180 | buf = &buf[12]; | |
181 | buf_size -= 12; | |
182 | ret = get_quant(avctx, c, buf, buf_size); | |
183 | if (ret < 0) | |
184 | return ret; | |
185 | ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq); | |
186 | return orig_size; | |
187 | } | |
188 | ||
189 | if (buf_size < 12 || buf[0] != 'V') { | |
190 | av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n"); | |
191 | return AVERROR_INVALIDDATA; | |
192 | } | |
193 | comptype = buf[1]; | |
194 | switch (comptype) { | |
195 | case NUV_RTJPEG_IN_LZO: | |
196 | case NUV_RTJPEG: | |
197 | keyframe = !buf[2]; | |
198 | break; | |
199 | case NUV_COPY_LAST: | |
200 | keyframe = 0; | |
201 | break; | |
202 | default: | |
203 | keyframe = 1; | |
204 | break; | |
205 | } | |
206 | retry: | |
207 | // skip rest of the frameheader. | |
208 | buf = &buf[12]; | |
209 | buf_size -= 12; | |
210 | if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) { | |
211 | int outlen = c->decomp_size - FFMAX(FF_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING); | |
212 | int inlen = buf_size; | |
213 | if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) { | |
214 | av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n"); | |
215 | return AVERROR_INVALIDDATA; | |
216 | } | |
217 | buf = c->decomp_buf; | |
218 | buf_size = c->decomp_size - FFMAX(FF_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING) - outlen; | |
219 | memset(c->decomp_buf + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE); | |
220 | } | |
221 | if (c->codec_frameheader) { | |
222 | int w, h, q; | |
223 | if (buf_size < RTJPEG_HEADER_SIZE) { | |
224 | av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n"); | |
225 | return AVERROR_INVALIDDATA; | |
226 | } | |
227 | // There seem to exist two variants of this header: one starts with 'V' | |
228 | // and 5 bytes unknown, the other matches current MythTV and is 4 bytes size, | |
229 | // 1 byte header size (== 12), 1 byte version (== 0) | |
230 | if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) { | |
231 | av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\n"); | |
232 | return AVERROR_INVALIDDATA; | |
233 | } | |
234 | w = AV_RL16(&buf[6]); | |
235 | h = AV_RL16(&buf[8]); | |
236 | q = buf[10]; | |
237 | if ((result = codec_reinit(avctx, w, h, q)) < 0) | |
238 | return result; | |
239 | if (result) { | |
240 | buf = avpkt->data; | |
241 | buf_size = avpkt->size; | |
242 | size_change = 1; | |
243 | goto retry; | |
244 | } | |
245 | buf = &buf[RTJPEG_HEADER_SIZE]; | |
246 | buf_size -= RTJPEG_HEADER_SIZE; | |
247 | } | |
248 | ||
249 | if (size_change || keyframe) { | |
250 | av_frame_unref(c->pic); | |
251 | init_frame = 1; | |
252 | } | |
253 | ||
254 | if ((result = ff_reget_buffer(avctx, c->pic)) < 0) | |
255 | return result; | |
256 | if (init_frame) { | |
257 | memset(c->pic->data[0], 0, avctx->height * c->pic->linesize[0]); | |
258 | memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2); | |
259 | memset(c->pic->data[2], 0x80, avctx->height * c->pic->linesize[2] / 2); | |
260 | } | |
261 | ||
262 | c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; | |
263 | c->pic->key_frame = keyframe; | |
264 | // decompress/copy/whatever data | |
265 | switch (comptype) { | |
266 | case NUV_LZO: | |
267 | case NUV_UNCOMPRESSED: { | |
268 | int height = c->height; | |
269 | if (buf_size < c->width * height * 3 / 2) { | |
270 | av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n"); | |
271 | height = buf_size / c->width / 3 * 2; | |
272 | } | |
273 | if(height > 0) | |
274 | copy_frame(c->pic, buf, c->width, height); | |
275 | break; | |
276 | } | |
277 | case NUV_RTJPEG_IN_LZO: | |
278 | case NUV_RTJPEG: | |
279 | ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size); | |
280 | if (ret < 0) | |
281 | return ret; | |
282 | break; | |
283 | case NUV_BLACK: | |
284 | memset(c->pic->data[0], 0, c->width * c->height); | |
285 | memset(c->pic->data[1], 128, c->width * c->height / 4); | |
286 | memset(c->pic->data[2], 128, c->width * c->height / 4); | |
287 | break; | |
288 | case NUV_COPY_LAST: | |
289 | /* nothing more to do here */ | |
290 | break; | |
291 | default: | |
292 | av_log(avctx, AV_LOG_ERROR, "unknown compression\n"); | |
293 | return AVERROR_INVALIDDATA; | |
294 | } | |
295 | ||
296 | if ((result = av_frame_ref(picture, c->pic)) < 0) | |
297 | return result; | |
298 | ||
299 | *got_frame = 1; | |
300 | return orig_size; | |
301 | } | |
302 | ||
303 | static av_cold int decode_init(AVCodecContext *avctx) | |
304 | { | |
305 | NuvContext *c = avctx->priv_data; | |
306 | int ret; | |
307 | ||
308 | c->pic = av_frame_alloc(); | |
309 | if (!c->pic) | |
310 | return AVERROR(ENOMEM); | |
311 | ||
312 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; | |
313 | c->decomp_buf = NULL; | |
314 | c->quality = -1; | |
315 | c->width = 0; | |
316 | c->height = 0; | |
317 | ||
318 | c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G'); | |
319 | ||
320 | if (avctx->extradata_size) | |
321 | get_quant(avctx, c, avctx->extradata, avctx->extradata_size); | |
322 | ||
323 | ff_rtjpeg_init(&c->rtj, avctx); | |
324 | ||
325 | if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0) | |
326 | return ret; | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | static av_cold int decode_end(AVCodecContext *avctx) | |
332 | { | |
333 | NuvContext *c = avctx->priv_data; | |
334 | ||
335 | av_freep(&c->decomp_buf); | |
336 | av_frame_free(&c->pic); | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
341 | AVCodec ff_nuv_decoder = { | |
342 | .name = "nuv", | |
343 | .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"), | |
344 | .type = AVMEDIA_TYPE_VIDEO, | |
345 | .id = AV_CODEC_ID_NUV, | |
346 | .priv_data_size = sizeof(NuvContext), | |
347 | .init = decode_init, | |
348 | .close = decode_end, | |
349 | .decode = decode_frame, | |
350 | .capabilities = CODEC_CAP_DR1, | |
351 | }; |