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 {
36  int quality;
37  int width, height;
38  unsigned int decomp_size;
39  unsigned char *decomp_buf;
40  uint32_t lq[64], cq[64];
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 AVERROR_INVALIDDATA;
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  int ret;
117 
118  width = FFALIGN(width, 2);
119  height = FFALIGN(height, 2);
120  if (quality >= 0)
121  get_quant_quality(c, quality);
122  if (width != c->width || height != c->height) {
123  void *ptr;
124  if ((ret = av_image_check_size(height, width, 0, avctx)) < 0)
125  return ret;
126  avctx->width = c->width = width;
127  avctx->height = c->height = height;
128  ptr = av_fast_realloc(c->decomp_buf, &c->decomp_size,
129  c->height * c->width * 3 / 2 +
132  if (!ptr) {
133  av_log(avctx, AV_LOG_ERROR,
134  "Can't allocate decompression buffer.\n");
135  return AVERROR(ENOMEM);
136  } else
137  c->decomp_buf = ptr;
138  ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height,
139  c->lq, c->cq);
140  if (c->pic.data[0])
141  avctx->release_buffer(avctx, &c->pic);
142  } else if (quality != c->quality)
143  ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height,
144  c->lq, c->cq);
145 
146  return 0;
147 }
148 
149 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
150  AVPacket *avpkt)
151 {
152  const uint8_t *buf = avpkt->data;
153  int buf_size = avpkt->size;
154  NuvContext *c = avctx->priv_data;
155  AVFrame *picture = data;
156  int orig_size = buf_size;
157  int keyframe;
158  int result;
159  int ret;
160  enum {
161  NUV_UNCOMPRESSED = '0',
162  NUV_RTJPEG = '1',
163  NUV_RTJPEG_IN_LZO = '2',
164  NUV_LZO = '3',
165  NUV_BLACK = 'N',
166  NUV_COPY_LAST = 'L'
167  } comptype;
168 
169  if (buf_size < 12) {
170  av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
171  return AVERROR_INVALIDDATA;
172  }
173 
174  // codec data (rtjpeg quant tables)
175  if (buf[0] == 'D' && buf[1] == 'R') {
176  int ret;
177  // skip rest of the frameheader.
178  buf = &buf[12];
179  buf_size -= 12;
180  ret = get_quant(avctx, c, buf, buf_size);
181  if (ret < 0)
182  return ret;
183  ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq,
184  c->cq);
185  return orig_size;
186  }
187 
188  if (buf[0] != 'V' || buf_size < 12) {
189  av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
190  return AVERROR_INVALIDDATA;
191  }
192  comptype = buf[1];
193  switch (comptype) {
194  case NUV_RTJPEG_IN_LZO:
195  case NUV_RTJPEG:
196  keyframe = !buf[2];
197  break;
198  case NUV_COPY_LAST:
199  keyframe = 0;
200  break;
201  default:
202  keyframe = 1;
203  break;
204  }
205  // skip rest of the frameheader.
206  buf = &buf[12];
207  buf_size -= 12;
208  if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
209  int outlen = c->decomp_size - FF_INPUT_BUFFER_PADDING_SIZE;
210  int inlen = buf_size;
211  if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
212  av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
213  return AVERROR_INVALIDDATA;
214  }
215  buf = c->decomp_buf;
216  buf_size = outlen;
217  }
218  if (c->codec_frameheader) {
219  int w, h, q;
220  if (buf_size < RTJPEG_HEADER_SIZE || buf[4] != RTJPEG_HEADER_SIZE ||
221  buf[5] != RTJPEG_FILE_VERSION) {
222  av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame\n");
223  return AVERROR_INVALIDDATA;
224  }
225  w = AV_RL16(&buf[6]);
226  h = AV_RL16(&buf[8]);
227  q = buf[10];
228  if ((result = codec_reinit(avctx, w, h, q)) < 0)
229  return result;
230  if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO)
231  buf = c->decomp_buf;
232  buf = &buf[RTJPEG_HEADER_SIZE];
233  buf_size -= RTJPEG_HEADER_SIZE;
234  }
235 
236  if (keyframe && c->pic.data[0])
237  avctx->release_buffer(avctx, &c->pic);
238  c->pic.reference = 3;
241  result = avctx->reget_buffer(avctx, &c->pic);
242  if (result < 0) {
243  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
244  return result;
245  }
246 
248  c->pic.key_frame = keyframe;
249  // decompress/copy/whatever data
250  switch (comptype) {
251  case NUV_LZO:
252  case NUV_UNCOMPRESSED: {
253  int height = c->height;
254  if (buf_size < c->width * height * 3 / 2) {
255  av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
256  height = buf_size / c->width / 3 * 2;
257  }
258  copy_frame(&c->pic, buf, c->width, height);
259  break;
260  }
261  case NUV_RTJPEG_IN_LZO:
262  case NUV_RTJPEG:
263  ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
264  if (ret < 0)
265  return ret;
266  break;
267  case NUV_BLACK:
268  memset(c->pic.data[0], 0, c->width * c->height);
269  memset(c->pic.data[1], 128, c->width * c->height / 4);
270  memset(c->pic.data[2], 128, c->width * c->height / 4);
271  break;
272  case NUV_COPY_LAST:
273  /* nothing more to do here */
274  break;
275  default:
276  av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
277  return AVERROR_INVALIDDATA;
278  }
279 
280  *picture = c->pic;
281  *got_frame = 1;
282  return orig_size;
283 }
284 
286 {
287  NuvContext *c = avctx->priv_data;
288  int ret;
289 
290  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
291  c->pic.data[0] = NULL;
292  c->decomp_buf = NULL;
293  c->quality = -1;
294  c->width = 0;
295  c->height = 0;
296 
297  c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
298 
299  if (avctx->extradata_size)
300  get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
301 
302  ff_dsputil_init(&c->dsp, avctx);
303 
304  if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
305  return ret;
306 
307  return 0;
308 }
309 
311 {
312  NuvContext *c = avctx->priv_data;
313 
314  av_freep(&c->decomp_buf);
315  if (c->pic.data[0])
316  avctx->release_buffer(avctx, &c->pic);
317 
318  return 0;
319 }
320 
322  .name = "nuv",
323  .type = AVMEDIA_TYPE_VIDEO,
324  .id = AV_CODEC_ID_NUV,
325  .priv_data_size = sizeof(NuvContext),
326  .init = decode_init,
327  .close = decode_end,
328  .decode = decode_frame,
329  .capabilities = CODEC_CAP_DR1,
330  .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
331 };