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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. #include "libavutil/bswap.h"
  24. #include "libavutil/common.h"
  25. #include "libavutil/intreadwrite.h"
  26. #include "libavutil/lzo.h"
  27. #include "libavutil/imgutils.h"
  28. #include "avcodec.h"
  29. #include "internal.h"
  30. #include "rtjpeg.h"
  31. typedef struct {
  32. AVFrame *pic;
  33. int codec_frameheader;
  34. int quality;
  35. int width, height;
  36. unsigned int decomp_size;
  37. unsigned char *decomp_buf;
  38. uint32_t lq[64], cq[64];
  39. RTJpegContext rtj;
  40. } NuvContext;
  41. static const uint8_t fallback_lquant[] = {
  42. 16, 11, 10, 16, 24, 40, 51, 61,
  43. 12, 12, 14, 19, 26, 58, 60, 55,
  44. 14, 13, 16, 24, 40, 57, 69, 56,
  45. 14, 17, 22, 29, 51, 87, 80, 62,
  46. 18, 22, 37, 56, 68, 109, 103, 77,
  47. 24, 35, 55, 64, 81, 104, 113, 92,
  48. 49, 64, 78, 87, 103, 121, 120, 101,
  49. 72, 92, 95, 98, 112, 100, 103, 99
  50. };
  51. static const uint8_t fallback_cquant[] = {
  52. 17, 18, 24, 47, 99, 99, 99, 99,
  53. 18, 21, 26, 66, 99, 99, 99, 99,
  54. 24, 26, 56, 99, 99, 99, 99, 99,
  55. 47, 66, 99, 99, 99, 99, 99, 99,
  56. 99, 99, 99, 99, 99, 99, 99, 99,
  57. 99, 99, 99, 99, 99, 99, 99, 99,
  58. 99, 99, 99, 99, 99, 99, 99, 99,
  59. 99, 99, 99, 99, 99, 99, 99, 99
  60. };
  61. /**
  62. * @brief copy frame data from buffer to AVFrame, handling stride.
  63. * @param f destination AVFrame
  64. * @param src source buffer, does not use any line-stride
  65. * @param width width of the video frame
  66. * @param height height of the video frame
  67. */
  68. static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
  69. {
  70. AVPicture pic;
  71. avpicture_fill(&pic, src, AV_PIX_FMT_YUV420P, width, height);
  72. av_picture_copy((AVPicture *)f, &pic, AV_PIX_FMT_YUV420P, width, height);
  73. }
  74. /**
  75. * @brief extract quantization tables from codec data into our context
  76. */
  77. static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
  78. int size)
  79. {
  80. int i;
  81. if (size < 2 * 64 * 4) {
  82. av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
  83. return AVERROR_INVALIDDATA;
  84. }
  85. for (i = 0; i < 64; i++, buf += 4)
  86. c->lq[i] = AV_RL32(buf);
  87. for (i = 0; i < 64; i++, buf += 4)
  88. c->cq[i] = AV_RL32(buf);
  89. return 0;
  90. }
  91. /**
  92. * @brief set quantization tables from a quality value
  93. */
  94. static void get_quant_quality(NuvContext *c, int quality)
  95. {
  96. int i;
  97. quality = FFMAX(quality, 1);
  98. for (i = 0; i < 64; i++) {
  99. c->lq[i] = (fallback_lquant[i] << 7) / quality;
  100. c->cq[i] = (fallback_cquant[i] << 7) / quality;
  101. }
  102. }
  103. static int codec_reinit(AVCodecContext *avctx, int width, int height,
  104. int quality)
  105. {
  106. NuvContext *c = avctx->priv_data;
  107. int ret;
  108. width = FFALIGN(width, 2);
  109. height = FFALIGN(height, 2);
  110. if (quality >= 0)
  111. get_quant_quality(c, quality);
  112. if (width != c->width || height != c->height) {
  113. void *ptr;
  114. if ((ret = av_image_check_size(height, width, 0, avctx)) < 0)
  115. return ret;
  116. avctx->width = c->width = width;
  117. avctx->height = c->height = height;
  118. ptr = av_fast_realloc(c->decomp_buf, &c->decomp_size,
  119. c->height * c->width * 3 / 2 +
  120. FF_INPUT_BUFFER_PADDING_SIZE +
  121. RTJPEG_HEADER_SIZE);
  122. if (!ptr) {
  123. av_log(avctx, AV_LOG_ERROR,
  124. "Can't allocate decompression buffer.\n");
  125. return AVERROR(ENOMEM);
  126. } else
  127. c->decomp_buf = ptr;
  128. ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
  129. av_frame_unref(c->pic);
  130. } else if (quality != c->quality)
  131. ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
  132. return 0;
  133. }
  134. static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
  135. AVPacket *avpkt)
  136. {
  137. const uint8_t *buf = avpkt->data;
  138. int buf_size = avpkt->size;
  139. NuvContext *c = avctx->priv_data;
  140. AVFrame *picture = data;
  141. int orig_size = buf_size;
  142. int keyframe, ret;
  143. int result, init_frame = !avctx->frame_number;
  144. enum {
  145. NUV_UNCOMPRESSED = '0',
  146. NUV_RTJPEG = '1',
  147. NUV_RTJPEG_IN_LZO = '2',
  148. NUV_LZO = '3',
  149. NUV_BLACK = 'N',
  150. NUV_COPY_LAST = 'L'
  151. } comptype;
  152. if (buf_size < 12) {
  153. av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
  154. return AVERROR_INVALIDDATA;
  155. }
  156. // codec data (rtjpeg quant tables)
  157. if (buf[0] == 'D' && buf[1] == 'R') {
  158. int ret;
  159. // skip rest of the frameheader.
  160. buf = &buf[12];
  161. buf_size -= 12;
  162. ret = get_quant(avctx, c, buf, buf_size);
  163. if (ret < 0)
  164. return ret;
  165. ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
  166. return orig_size;
  167. }
  168. if (buf[0] != 'V' || buf_size < 12) {
  169. av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
  170. return AVERROR_INVALIDDATA;
  171. }
  172. comptype = buf[1];
  173. switch (comptype) {
  174. case NUV_RTJPEG_IN_LZO:
  175. case NUV_RTJPEG:
  176. keyframe = !buf[2];
  177. break;
  178. case NUV_COPY_LAST:
  179. keyframe = 0;
  180. break;
  181. default:
  182. keyframe = 1;
  183. break;
  184. }
  185. // skip rest of the frameheader.
  186. buf = &buf[12];
  187. buf_size -= 12;
  188. if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
  189. int outlen = c->decomp_size - FF_INPUT_BUFFER_PADDING_SIZE;
  190. int inlen = buf_size;
  191. if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
  192. av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
  193. return AVERROR_INVALIDDATA;
  194. }
  195. buf = c->decomp_buf;
  196. buf_size = outlen;
  197. }
  198. if (c->codec_frameheader) {
  199. int w, h, q;
  200. if (buf_size < RTJPEG_HEADER_SIZE || buf[4] != RTJPEG_HEADER_SIZE ||
  201. buf[5] != RTJPEG_FILE_VERSION) {
  202. av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame\n");
  203. return AVERROR_INVALIDDATA;
  204. }
  205. w = AV_RL16(&buf[6]);
  206. h = AV_RL16(&buf[8]);
  207. q = buf[10];
  208. if ((result = codec_reinit(avctx, w, h, q)) < 0)
  209. return result;
  210. if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO)
  211. buf = c->decomp_buf;
  212. buf = &buf[RTJPEG_HEADER_SIZE];
  213. buf_size -= RTJPEG_HEADER_SIZE;
  214. }
  215. if (keyframe) {
  216. av_frame_unref(c->pic);
  217. init_frame = 1;
  218. }
  219. result = ff_reget_buffer(avctx, c->pic);
  220. if (result < 0) {
  221. av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
  222. return result;
  223. }
  224. if (init_frame) {
  225. memset(c->pic->data[0], 0, avctx->height * c->pic->linesize[0]);
  226. memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2);
  227. memset(c->pic->data[2], 0x80, avctx->height * c->pic->linesize[2] / 2);
  228. }
  229. c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
  230. c->pic->key_frame = keyframe;
  231. // decompress/copy/whatever data
  232. switch (comptype) {
  233. case NUV_LZO:
  234. case NUV_UNCOMPRESSED: {
  235. int height = c->height;
  236. if (buf_size < c->width * height * 3 / 2) {
  237. av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
  238. height = buf_size / c->width / 3 * 2;
  239. }
  240. copy_frame(c->pic, buf, c->width, height);
  241. break;
  242. }
  243. case NUV_RTJPEG_IN_LZO:
  244. case NUV_RTJPEG:
  245. ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
  246. if (ret < 0)
  247. return ret;
  248. break;
  249. case NUV_BLACK:
  250. memset(c->pic->data[0], 0, c->width * c->height);
  251. memset(c->pic->data[1], 128, c->width * c->height / 4);
  252. memset(c->pic->data[2], 128, c->width * c->height / 4);
  253. break;
  254. case NUV_COPY_LAST:
  255. /* nothing more to do here */
  256. break;
  257. default:
  258. av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
  259. return AVERROR_INVALIDDATA;
  260. }
  261. if ((result = av_frame_ref(picture, c->pic)) < 0)
  262. return result;
  263. *got_frame = 1;
  264. return orig_size;
  265. }
  266. static av_cold int decode_init(AVCodecContext *avctx)
  267. {
  268. NuvContext *c = avctx->priv_data;
  269. int ret;
  270. c->pic = av_frame_alloc();
  271. if (!c->pic)
  272. return AVERROR(ENOMEM);
  273. avctx->pix_fmt = AV_PIX_FMT_YUV420P;
  274. c->decomp_buf = NULL;
  275. c->quality = -1;
  276. c->width = 0;
  277. c->height = 0;
  278. c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
  279. if (avctx->extradata_size)
  280. get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
  281. ff_rtjpeg_init(&c->rtj, avctx);
  282. if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
  283. return ret;
  284. return 0;
  285. }
  286. static av_cold int decode_end(AVCodecContext *avctx)
  287. {
  288. NuvContext *c = avctx->priv_data;
  289. av_freep(&c->decomp_buf);
  290. av_frame_free(&c->pic);
  291. return 0;
  292. }
  293. AVCodec ff_nuv_decoder = {
  294. .name = "nuv",
  295. .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
  296. .type = AVMEDIA_TYPE_VIDEO,
  297. .id = AV_CODEC_ID_NUV,
  298. .priv_data_size = sizeof(NuvContext),
  299. .init = decode_init,
  300. .close = decode_end,
  301. .decode = decode_frame,
  302. .capabilities = CODEC_CAP_DR1,
  303. };