nuv.c
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1 /*
2  * NuppelVideo decoder
3  * Copyright (c) 2006 Reimar Doeffinger
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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 
25 #include "libavutil/bswap.h"
26 #include "libavutil/common.h"
27 #include "libavutil/lzo.h"
28 #include "libavutil/imgutils.h"
29 #include "avcodec.h"
30 #include "dsputil.h"
31 #include "rtjpeg.h"
32 
33 typedef struct {
34  AVFrame pic;
35  int codec_frameheader;
36  int quality;
37  int width, height;
38  unsigned int decomp_size;
39  unsigned char *decomp_buf;
40  uint32_t lq[64], cq[64];
41  RTJpegContext rtj;
42  DSPContext dsp;
43 } NuvContext;
44 
45 static const uint8_t fallback_lquant[] = {
46  16, 11, 10, 16, 24, 40, 51, 61,
47  12, 12, 14, 19, 26, 58, 60, 55,
48  14, 13, 16, 24, 40, 57, 69, 56,
49  14, 17, 22, 29, 51, 87, 80, 62,
50  18, 22, 37, 56, 68, 109, 103, 77,
51  24, 35, 55, 64, 81, 104, 113, 92,
52  49, 64, 78, 87, 103, 121, 120, 101,
53  72, 92, 95, 98, 112, 100, 103, 99
54 };
55 
56 static const uint8_t fallback_cquant[] = {
57  17, 18, 24, 47, 99, 99, 99, 99,
58  18, 21, 26, 66, 99, 99, 99, 99,
59  24, 26, 56, 99, 99, 99, 99, 99,
60  47, 66, 99, 99, 99, 99, 99, 99,
61  99, 99, 99, 99, 99, 99, 99, 99,
62  99, 99, 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 };
66 
74 static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
75 {
76  AVPicture pic;
77  avpicture_fill(&pic, src, AV_PIX_FMT_YUV420P, width, height);
78  av_picture_copy((AVPicture *)f, &pic, AV_PIX_FMT_YUV420P, width, height);
79 }
80 
84 static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
85  int size)
86 {
87  int i;
88  if (size < 2 * 64 * 4) {
89  av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
90  return -1;
91  }
92  for (i = 0; i < 64; i++, buf += 4)
93  c->lq[i] = AV_RL32(buf);
94  for (i = 0; i < 64; i++, buf += 4)
95  c->cq[i] = AV_RL32(buf);
96  return 0;
97 }
98 
102 static void get_quant_quality(NuvContext *c, int quality)
103 {
104  int i;
105  quality = FFMAX(quality, 1);
106  for (i = 0; i < 64; i++) {
107  c->lq[i] = (fallback_lquant[i] << 7) / quality;
108  c->cq[i] = (fallback_cquant[i] << 7) / quality;
109  }
110 }
111 
112 static int codec_reinit(AVCodecContext *avctx, int width, int height,
113  int quality)
114 {
115  NuvContext *c = avctx->priv_data;
116  width = FFALIGN(width, 2);
117  height = FFALIGN(height, 2);
118  if (quality >= 0)
119  get_quant_quality(c, quality);
120  if (width != c->width || height != c->height) {
121  if (av_image_check_size(height, width, 0, avctx) < 0)
122  return 0;
123  avctx->width = c->width = width;
124  avctx->height = c->height = height;
125  av_fast_malloc(&c->decomp_buf, &c->decomp_size,
126  c->height * c->width * 3 / 2);
127  if (!c->decomp_buf) {
128  av_log(avctx, AV_LOG_ERROR,
129  "Can't allocate decompression buffer.\n");
130  return 0;
131  }
132  ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height,
133  c->lq, c->cq);
134  } else if (quality != c->quality)
135  ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height,
136  c->lq, c->cq);
137 
138  return 1;
139 }
140 
141 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
142  AVPacket *avpkt)
143 {
144  const uint8_t *buf = avpkt->data;
145  int buf_size = avpkt->size;
146  NuvContext *c = avctx->priv_data;
147  AVFrame *picture = data;
148  int orig_size = buf_size;
149  int keyframe;
150  int result;
151  enum {
152  NUV_UNCOMPRESSED = '0',
153  NUV_RTJPEG = '1',
154  NUV_RTJPEG_IN_LZO = '2',
155  NUV_LZO = '3',
156  NUV_BLACK = 'N',
157  NUV_COPY_LAST = 'L'
158  } comptype;
159 
160  if (buf_size < 12) {
161  av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
162  return -1;
163  }
164 
165  // codec data (rtjpeg quant tables)
166  if (buf[0] == 'D' && buf[1] == 'R') {
167  int ret;
168  // skip rest of the frameheader.
169  buf = &buf[12];
170  buf_size -= 12;
171  ret = get_quant(avctx, c, buf, buf_size);
172  if (ret < 0)
173  return ret;
174  ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq,
175  c->cq);
176  return orig_size;
177  }
178 
179  if (buf[0] != 'V' || buf_size < 12) {
180  av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
181  return -1;
182  }
183  comptype = buf[1];
184  switch (comptype) {
185  case NUV_RTJPEG_IN_LZO:
186  case NUV_RTJPEG:
187  keyframe = !buf[2];
188  break;
189  case NUV_COPY_LAST:
190  keyframe = 0;
191  break;
192  default:
193  keyframe = 1;
194  break;
195  }
196  // skip rest of the frameheader.
197  buf = &buf[12];
198  buf_size -= 12;
199  if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
200  int outlen = c->decomp_size, inlen = buf_size;
201  if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
202  av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
203  buf = c->decomp_buf;
204  buf_size = c->decomp_size;
205  }
206  if (c->codec_frameheader) {
207  int w, h, q;
208  if (buf_size < RTJPEG_HEADER_SIZE || buf[4] != RTJPEG_HEADER_SIZE ||
209  buf[5] != RTJPEG_FILE_VERSION) {
210  av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame\n");
211  return AVERROR_INVALIDDATA;
212  }
213  w = AV_RL16(&buf[6]);
214  h = AV_RL16(&buf[8]);
215  q = buf[10];
216  if (!codec_reinit(avctx, w, h, q))
217  return -1;
218  buf = &buf[RTJPEG_HEADER_SIZE];
219  buf_size -= RTJPEG_HEADER_SIZE;
220  }
221 
222  if (keyframe && c->pic.data[0])
223  avctx->release_buffer(avctx, &c->pic);
224  c->pic.reference = 3;
225  c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
226  FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
227  result = avctx->reget_buffer(avctx, &c->pic);
228  if (result < 0) {
229  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
230  return -1;
231  }
232 
233  c->pic.pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
234  c->pic.key_frame = keyframe;
235  // decompress/copy/whatever data
236  switch (comptype) {
237  case NUV_LZO:
238  case NUV_UNCOMPRESSED: {
239  int height = c->height;
240  if (buf_size < c->width * height * 3 / 2) {
241  av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
242  height = buf_size / c->width / 3 * 2;
243  }
244  copy_frame(&c->pic, buf, c->width, height);
245  break;
246  }
247  case NUV_RTJPEG_IN_LZO:
248  case NUV_RTJPEG:
249  ff_rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
250  break;
251  case NUV_BLACK:
252  memset(c->pic.data[0], 0, c->width * c->height);
253  memset(c->pic.data[1], 128, c->width * c->height / 4);
254  memset(c->pic.data[2], 128, c->width * c->height / 4);
255  break;
256  case NUV_COPY_LAST:
257  /* nothing more to do here */
258  break;
259  default:
260  av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
261  return -1;
262  }
263 
264  *picture = c->pic;
265  *got_frame = 1;
266  return orig_size;
267 }
268 
269 static av_cold int decode_init(AVCodecContext *avctx)
270 {
271  NuvContext *c = avctx->priv_data;
272  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
273  c->pic.data[0] = NULL;
274  c->decomp_buf = NULL;
275  c->quality = -1;
276  c->width = 0;
277  c->height = 0;
278 
279  c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
280 
281  if (avctx->extradata_size)
282  get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
283 
284  ff_dsputil_init(&c->dsp, avctx);
285 
286  if (!codec_reinit(avctx, avctx->width, avctx->height, -1))
287  return 1;
288 
289  return 0;
290 }
291 
292 static av_cold int decode_end(AVCodecContext *avctx)
293 {
294  NuvContext *c = avctx->priv_data;
295 
296  av_freep(&c->decomp_buf);
297  if (c->pic.data[0])
298  avctx->release_buffer(avctx, &c->pic);
299 
300  return 0;
301 }
302 
303 AVCodec ff_nuv_decoder = {
304  .name = "nuv",
305  .type = AVMEDIA_TYPE_VIDEO,
306  .id = AV_CODEC_ID_NUV,
307  .priv_data_size = sizeof(NuvContext),
308  .init = decode_init,
309  .close = decode_end,
310  .decode = decode_frame,
311  .capabilities = CODEC_CAP_DR1,
312  .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
313 };