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 #include <stdio.h>
22 #include <stdlib.h>
23 
24 #include "libavutil/bswap.h"
25 #include "libavutil/lzo.h"
26 #include "libavutil/imgutils.h"
27 #include "avcodec.h"
28 #include "dsputil.h"
29 #include "rtjpeg.h"
30 
31 typedef struct {
34  int quality;
35  int width, height;
36  unsigned int decomp_size;
37  unsigned char* decomp_buf;
38  uint32_t lq[64], cq[64];
41 } NuvContext;
42 
43 static const uint8_t fallback_lquant[] = {
44  16, 11, 10, 16, 24, 40, 51, 61,
45  12, 12, 14, 19, 26, 58, 60, 55,
46  14, 13, 16, 24, 40, 57, 69, 56,
47  14, 17, 22, 29, 51, 87, 80, 62,
48  18, 22, 37, 56, 68, 109, 103, 77,
49  24, 35, 55, 64, 81, 104, 113, 92,
50  49, 64, 78, 87, 103, 121, 120, 101,
51  72, 92, 95, 98, 112, 100, 103, 99
52 };
53 
54 static const uint8_t fallback_cquant[] = {
55  17, 18, 24, 47, 99, 99, 99, 99,
56  18, 21, 26, 66, 99, 99, 99, 99,
57  24, 26, 56, 99, 99, 99, 99, 99,
58  47, 66, 99, 99, 99, 99, 99, 99,
59  99, 99, 99, 99, 99, 99, 99, 99,
60  99, 99, 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 };
64 
72 static void copy_frame(AVFrame *f, const uint8_t *src,
73  int width, int height) {
74  AVPicture pic;
75  avpicture_fill(&pic, src, PIX_FMT_YUV420P, width, height);
76  av_picture_copy((AVPicture *)f, &pic, PIX_FMT_YUV420P, width, height);
77 }
78 
82 static int get_quant(AVCodecContext *avctx, NuvContext *c,
83  const uint8_t *buf, int size) {
84  int i;
85  if (size < 2 * 64 * 4) {
86  av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
87  return -1;
88  }
89  for (i = 0; i < 64; i++, buf += 4)
90  c->lq[i] = AV_RL32(buf);
91  for (i = 0; i < 64; i++, buf += 4)
92  c->cq[i] = AV_RL32(buf);
93  return 0;
94 }
95 
99 static void get_quant_quality(NuvContext *c, int quality) {
100  int i;
101  quality = FFMAX(quality, 1);
102  for (i = 0; i < 64; i++) {
103  c->lq[i] = (fallback_lquant[i] << 7) / quality;
104  c->cq[i] = (fallback_cquant[i] << 7) / quality;
105  }
106 }
107 
108 static int codec_reinit(AVCodecContext *avctx, int width, int height, int quality) {
109  NuvContext *c = avctx->priv_data;
110  width = FFALIGN(width, 2);
111  height = FFALIGN(height, 2);
112  if (quality >= 0)
113  get_quant_quality(c, quality);
114  if (width != c->width || height != c->height) {
115  if (av_image_check_size(height, width, 0, avctx) < 0)
116  return 0;
117  avctx->width = c->width = width;
118  avctx->height = c->height = height;
119  av_fast_malloc(&c->decomp_buf, &c->decomp_size, c->height * c->width * 3 / 2);
120  if (!c->decomp_buf) {
121  av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
122  return 0;
123  }
124  rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
125  } else if (quality != c->quality)
126  rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
127  return 1;
128 }
129 
130 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
131  AVPacket *avpkt) {
132  const uint8_t *buf = avpkt->data;
133  int buf_size = avpkt->size;
134  NuvContext *c = avctx->priv_data;
135  AVFrame *picture = data;
136  int orig_size = buf_size;
137  int keyframe;
138  int result;
139  enum {NUV_UNCOMPRESSED = '0', NUV_RTJPEG = '1',
140  NUV_RTJPEG_IN_LZO = '2', NUV_LZO = '3',
141  NUV_BLACK = 'N', NUV_COPY_LAST = 'L'} comptype;
142 
143  if (buf_size < 12) {
144  av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
145  return -1;
146  }
147 
148  // codec data (rtjpeg quant tables)
149  if (buf[0] == 'D' && buf[1] == 'R') {
150  int ret;
151  // skip rest of the frameheader.
152  buf = &buf[12];
153  buf_size -= 12;
154  ret = get_quant(avctx, c, buf, buf_size);
155  if (ret < 0)
156  return ret;
157  rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
158  return orig_size;
159  }
160 
161  if (buf[0] != 'V' || buf_size < 12) {
162  av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
163  return -1;
164  }
165  comptype = buf[1];
166  switch (comptype) {
167  case NUV_RTJPEG_IN_LZO:
168  case NUV_RTJPEG:
169  keyframe = !buf[2]; break;
170  case NUV_COPY_LAST:
171  keyframe = 0; break;
172  default:
173  keyframe = 1; break;
174  }
175  // skip rest of the frameheader.
176  buf = &buf[12];
177  buf_size -= 12;
178  if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
179  int outlen = c->decomp_size, inlen = buf_size;
180  if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
181  av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
182  buf = c->decomp_buf;
183  buf_size = c->decomp_size;
184  }
185  if (c->codec_frameheader) {
186  int w, h, q;
187  if (buf_size < RTJPEG_HEADER_SIZE || buf[4] != RTJPEG_HEADER_SIZE ||
188  buf[5] != RTJPEG_FILE_VERSION) {
189  av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame\n");
190  return AVERROR_INVALIDDATA;
191  }
192  w = AV_RL16(&buf[6]);
193  h = AV_RL16(&buf[8]);
194  q = buf[10];
195  if (!codec_reinit(avctx, w, h, q))
196  return -1;
197  buf = &buf[RTJPEG_HEADER_SIZE];
198  buf_size -= RTJPEG_HEADER_SIZE;
199  }
200 
201  if (keyframe && c->pic.data[0])
202  avctx->release_buffer(avctx, &c->pic);
203  c->pic.reference = 3;
206  result = avctx->reget_buffer(avctx, &c->pic);
207  if (result < 0) {
208  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
209  return -1;
210  }
211 
213  c->pic.key_frame = keyframe;
214  // decompress/copy/whatever data
215  switch (comptype) {
216  case NUV_LZO:
217  case NUV_UNCOMPRESSED: {
218  int height = c->height;
219  if (buf_size < c->width * height * 3 / 2) {
220  av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
221  height = buf_size / c->width / 3 * 2;
222  }
223  copy_frame(&c->pic, buf, c->width, height);
224  break;
225  }
226  case NUV_RTJPEG_IN_LZO:
227  case NUV_RTJPEG: {
228  rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
229  break;
230  }
231  case NUV_BLACK: {
232  memset(c->pic.data[0], 0, c->width * c->height);
233  memset(c->pic.data[1], 128, c->width * c->height / 4);
234  memset(c->pic.data[2], 128, c->width * c->height / 4);
235  break;
236  }
237  case NUV_COPY_LAST: {
238  /* nothing more to do here */
239  break;
240  }
241  default:
242  av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
243  return -1;
244  }
245 
246  *picture = c->pic;
247  *data_size = sizeof(AVFrame);
248  return orig_size;
249 }
250 
251 static av_cold int decode_init(AVCodecContext *avctx) {
252  NuvContext *c = avctx->priv_data;
253  avctx->pix_fmt = PIX_FMT_YUV420P;
254  c->pic.data[0] = NULL;
255  c->decomp_buf = NULL;
256  c->quality = -1;
257  c->width = 0;
258  c->height = 0;
259  c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
260  if (avctx->extradata_size)
261  get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
262  dsputil_init(&c->dsp, avctx);
263  if (!codec_reinit(avctx, avctx->width, avctx->height, -1))
264  return 1;
265  return 0;
266 }
267 
268 static av_cold int decode_end(AVCodecContext *avctx) {
269  NuvContext *c = avctx->priv_data;
270  av_freep(&c->decomp_buf);
271  if (c->pic.data[0])
272  avctx->release_buffer(avctx, &c->pic);
273  return 0;
274 }
275 
277  .name = "nuv",
278  .type = AVMEDIA_TYPE_VIDEO,
279  .id = CODEC_ID_NUV,
280  .priv_data_size = sizeof(NuvContext),
281  .init = decode_init,
282  .close = decode_end,
283  .decode = decode_frame,
284  .capabilities = CODEC_CAP_DR1,
285  .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
286 };
287