3 * Copyright (c) 2006 Reimar Doeffinger
5 * This file is part of Libav.
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.
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.
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
25 #include "libavutil/bswap.h"
26 #include "libavutil/common.h"
27 #include "libavutil/lzo.h"
28 #include "libavutil/imgutils.h"
35 int codec_frameheader;
38 unsigned int decomp_size;
39 unsigned char *decomp_buf;
40 uint32_t lq[64], cq[64];
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
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
68 * @brief copy frame data from buffer to AVFrame, handling stride.
69 * @param f destination AVFrame
70 * @param src source buffer, does not use any line-stride
71 * @param width width of the video frame
72 * @param height height of the video frame
74 static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
77 avpicture_fill(&pic, src, AV_PIX_FMT_YUV420P, width, height);
78 av_picture_copy((AVPicture *)f, &pic, AV_PIX_FMT_YUV420P, width, height);
82 * @brief extract quantization tables from codec data into our context
84 static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
88 if (size < 2 * 64 * 4) {
89 av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
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);
100 * @brief set quantization tables from a quality value
102 static void get_quant_quality(NuvContext *c, int quality)
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;
112 static int codec_reinit(AVCodecContext *avctx, int width, int height,
115 NuvContext *c = avctx->priv_data;
116 width = FFALIGN(width, 2);
117 height = FFALIGN(height, 2);
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)
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");
132 ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height,
134 } else if (quality != c->quality)
135 ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height,
141 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
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;
152 NUV_UNCOMPRESSED = '0',
154 NUV_RTJPEG_IN_LZO = '2',
161 av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
165 // codec data (rtjpeg quant tables)
166 if (buf[0] == 'D' && buf[1] == 'R') {
168 // skip rest of the frameheader.
171 ret = get_quant(avctx, c, buf, buf_size);
174 ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq,
179 if (buf[0] != 'V' || buf_size < 12) {
180 av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
185 case NUV_RTJPEG_IN_LZO:
196 // skip rest of the frameheader.
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");
204 buf_size = c->decomp_size;
206 if (c->codec_frameheader) {
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;
213 w = AV_RL16(&buf[6]);
214 h = AV_RL16(&buf[8]);
216 if (!codec_reinit(avctx, w, h, q))
218 buf = &buf[RTJPEG_HEADER_SIZE];
219 buf_size -= RTJPEG_HEADER_SIZE;
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);
229 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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
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;
244 copy_frame(&c->pic, buf, c->width, height);
247 case NUV_RTJPEG_IN_LZO:
249 ff_rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
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);
257 /* nothing more to do here */
260 av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
265 *data_size = sizeof(AVFrame);
269 static av_cold int decode_init(AVCodecContext *avctx)
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;
279 c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
281 if (avctx->extradata_size)
282 get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
284 ff_dsputil_init(&c->dsp, avctx);
286 if (!codec_reinit(avctx, avctx->width, avctx->height, -1))
292 static av_cold int decode_end(AVCodecContext *avctx)
294 NuvContext *c = avctx->priv_data;
296 av_freep(&c->decomp_buf);
298 avctx->release_buffer(avctx, &c->pic);
303 AVCodec ff_nuv_decoder = {
305 .type = AVMEDIA_TYPE_VIDEO,
306 .id = AV_CODEC_ID_NUV,
307 .priv_data_size = sizeof(NuvContext),
310 .decode = decode_frame,
311 .capabilities = CODEC_CAP_DR1,
312 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),