Libav
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 "internal.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  av_frame_unref(c->pic);
141  } else if (quality != c->quality)
142  ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height,
143  c->lq, c->cq);
144 
145  return 0;
146 }
147 
148 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
149  AVPacket *avpkt)
150 {
151  const uint8_t *buf = avpkt->data;
152  int buf_size = avpkt->size;
153  NuvContext *c = avctx->priv_data;
154  AVFrame *picture = data;
155  int orig_size = buf_size;
156  int keyframe, ret;
157  int result, init_frame = !avctx->frame_number;
158  enum {
159  NUV_UNCOMPRESSED = '0',
160  NUV_RTJPEG = '1',
161  NUV_RTJPEG_IN_LZO = '2',
162  NUV_LZO = '3',
163  NUV_BLACK = 'N',
164  NUV_COPY_LAST = 'L'
165  } comptype;
166 
167  if (buf_size < 12) {
168  av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
169  return AVERROR_INVALIDDATA;
170  }
171 
172  // codec data (rtjpeg quant tables)
173  if (buf[0] == 'D' && buf[1] == 'R') {
174  int ret;
175  // skip rest of the frameheader.
176  buf = &buf[12];
177  buf_size -= 12;
178  ret = get_quant(avctx, c, buf, buf_size);
179  if (ret < 0)
180  return ret;
181  ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq,
182  c->cq);
183  return orig_size;
184  }
185 
186  if (buf[0] != 'V' || buf_size < 12) {
187  av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
188  return AVERROR_INVALIDDATA;
189  }
190  comptype = buf[1];
191  switch (comptype) {
192  case NUV_RTJPEG_IN_LZO:
193  case NUV_RTJPEG:
194  keyframe = !buf[2];
195  break;
196  case NUV_COPY_LAST:
197  keyframe = 0;
198  break;
199  default:
200  keyframe = 1;
201  break;
202  }
203  // skip rest of the frameheader.
204  buf = &buf[12];
205  buf_size -= 12;
206  if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
207  int outlen = c->decomp_size - FF_INPUT_BUFFER_PADDING_SIZE;
208  int inlen = buf_size;
209  if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
210  av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
211  return AVERROR_INVALIDDATA;
212  }
213  buf = c->decomp_buf;
214  buf_size = outlen;
215  }
216  if (c->codec_frameheader) {
217  int w, h, q;
218  if (buf_size < RTJPEG_HEADER_SIZE || buf[4] != RTJPEG_HEADER_SIZE ||
219  buf[5] != RTJPEG_FILE_VERSION) {
220  av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame\n");
221  return AVERROR_INVALIDDATA;
222  }
223  w = AV_RL16(&buf[6]);
224  h = AV_RL16(&buf[8]);
225  q = buf[10];
226  if ((result = codec_reinit(avctx, w, h, q)) < 0)
227  return result;
228  if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO)
229  buf = c->decomp_buf;
230  buf = &buf[RTJPEG_HEADER_SIZE];
231  buf_size -= RTJPEG_HEADER_SIZE;
232  }
233 
234  if (keyframe) {
235  av_frame_unref(c->pic);
236  init_frame = 1;
237  }
238 
239  result = ff_reget_buffer(avctx, c->pic);
240  if (result < 0) {
241  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
242  return result;
243  }
244  if (init_frame) {
245  memset(c->pic->data[0], 0, avctx->height * c->pic->linesize[0]);
246  memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2);
247  memset(c->pic->data[2], 0x80, avctx->height * c->pic->linesize[2] / 2);
248  }
249 
251  c->pic->key_frame = keyframe;
252  // decompress/copy/whatever data
253  switch (comptype) {
254  case NUV_LZO:
255  case NUV_UNCOMPRESSED: {
256  int height = c->height;
257  if (buf_size < c->width * height * 3 / 2) {
258  av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
259  height = buf_size / c->width / 3 * 2;
260  }
261  copy_frame(c->pic, buf, c->width, height);
262  break;
263  }
264  case NUV_RTJPEG_IN_LZO:
265  case NUV_RTJPEG:
266  ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
267  if (ret < 0)
268  return ret;
269  break;
270  case NUV_BLACK:
271  memset(c->pic->data[0], 0, c->width * c->height);
272  memset(c->pic->data[1], 128, c->width * c->height / 4);
273  memset(c->pic->data[2], 128, c->width * c->height / 4);
274  break;
275  case NUV_COPY_LAST:
276  /* nothing more to do here */
277  break;
278  default:
279  av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
280  return AVERROR_INVALIDDATA;
281  }
282 
283  if ((result = av_frame_ref(picture, c->pic)) < 0)
284  return result;
285 
286  *got_frame = 1;
287  return orig_size;
288 }
289 
291 {
292  NuvContext *c = avctx->priv_data;
293  int ret;
294 
295  c->pic = av_frame_alloc();
296  if (!c->pic)
297  return AVERROR(ENOMEM);
298 
299  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
300  c->decomp_buf = NULL;
301  c->quality = -1;
302  c->width = 0;
303  c->height = 0;
304 
305  c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
306 
307  if (avctx->extradata_size)
308  get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
309 
310  ff_dsputil_init(&c->dsp, avctx);
311 
312  if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
313  return ret;
314 
315  return 0;
316 }
317 
319 {
320  NuvContext *c = avctx->priv_data;
321 
322  av_freep(&c->decomp_buf);
323  av_frame_free(&c->pic);
324 
325  return 0;
326 }
327 
329  .name = "nuv",
330  .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
331  .type = AVMEDIA_TYPE_VIDEO,
332  .id = AV_CODEC_ID_NUV,
333  .priv_data_size = sizeof(NuvContext),
334  .init = decode_init,
335  .close = decode_end,
336  .decode = decode_frame,
337  .capabilities = CODEC_CAP_DR1,
338 };