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/intreadwrite.h"
28 #include "libavutil/lzo.h"
29 #include "libavutil/imgutils.h"
35 typedef struct NuvContext {
37 int codec_frameheader;
40 unsigned int decomp_size;
41 unsigned char *decomp_buf;
42 uint32_t lq[64], cq[64];
46 static const uint8_t fallback_lquant[] = {
47 16, 11, 10, 16, 24, 40, 51, 61,
48 12, 12, 14, 19, 26, 58, 60, 55,
49 14, 13, 16, 24, 40, 57, 69, 56,
50 14, 17, 22, 29, 51, 87, 80, 62,
51 18, 22, 37, 56, 68, 109, 103, 77,
52 24, 35, 55, 64, 81, 104, 113, 92,
53 49, 64, 78, 87, 103, 121, 120, 101,
54 72, 92, 95, 98, 112, 100, 103, 99
57 static const uint8_t fallback_cquant[] = {
58 17, 18, 24, 47, 99, 99, 99, 99,
59 18, 21, 26, 66, 99, 99, 99, 99,
60 24, 26, 56, 99, 99, 99, 99, 99,
61 47, 66, 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 99, 99, 99, 99, 99, 99, 99, 99
69 * @brief copy frame data from buffer to AVFrame, handling stride.
70 * @param f destination AVFrame
71 * @param src source buffer, does not use any line-stride
72 * @param width width of the video frame
73 * @param height height of the video frame
75 static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
79 av_image_fill_arrays(src_data, src_linesize, src,
80 f->format, width, height, 1);
81 av_image_copy(f->data, f->linesize, src_data, src_linesize,
82 f->format, width, height);
86 * @brief extract quantization tables from codec data into our context
88 static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
92 if (size < 2 * 64 * 4) {
93 av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
94 return AVERROR_INVALIDDATA;
96 for (i = 0; i < 64; i++, buf += 4)
97 c->lq[i] = AV_RL32(buf);
98 for (i = 0; i < 64; i++, buf += 4)
99 c->cq[i] = AV_RL32(buf);
104 * @brief set quantization tables from a quality value
106 static void get_quant_quality(NuvContext *c, int quality)
109 quality = FFMAX(quality, 1);
110 for (i = 0; i < 64; i++) {
111 c->lq[i] = (fallback_lquant[i] << 7) / quality;
112 c->cq[i] = (fallback_cquant[i] << 7) / quality;
116 static int codec_reinit(AVCodecContext *avctx, int width, int height,
119 NuvContext *c = avctx->priv_data;
122 width = FFALIGN(width, 2);
123 height = FFALIGN(height, 2);
125 get_quant_quality(c, quality);
126 if (width != c->width || height != c->height) {
128 if ((ret = av_image_check_size(height, width, 0, avctx)) < 0)
130 avctx->width = c->width = width;
131 avctx->height = c->height = height;
132 ptr = av_fast_realloc(c->decomp_buf, &c->decomp_size,
133 c->height * c->width * 3 / 2 +
134 AV_INPUT_BUFFER_PADDING_SIZE +
137 av_log(avctx, AV_LOG_ERROR,
138 "Can't allocate decompression buffer.\n");
139 return AVERROR(ENOMEM);
142 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
143 av_frame_unref(c->pic);
144 } else if (quality != c->quality)
145 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
150 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
153 const uint8_t *buf = avpkt->data;
154 int buf_size = avpkt->size;
155 NuvContext *c = avctx->priv_data;
156 AVFrame *picture = data;
157 int orig_size = buf_size;
159 int result, init_frame = !avctx->frame_number;
161 NUV_UNCOMPRESSED = '0',
163 NUV_RTJPEG_IN_LZO = '2',
170 av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
171 return AVERROR_INVALIDDATA;
174 // codec data (rtjpeg quant tables)
175 if (buf[0] == 'D' && buf[1] == 'R') {
177 // Skip the rest of the frame header.
180 ret = get_quant(avctx, c, buf, buf_size);
183 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
187 if (buf[0] != 'V' || buf_size < 12) {
188 av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
189 return AVERROR_INVALIDDATA;
193 case NUV_RTJPEG_IN_LZO:
204 // Skip the rest of the frame header.
207 if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
208 int outlen = c->decomp_size - AV_INPUT_BUFFER_PADDING_SIZE;
209 int inlen = buf_size;
210 if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
211 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
212 return AVERROR_INVALIDDATA;
217 if (c->codec_frameheader) {
219 if (buf_size < RTJPEG_HEADER_SIZE || buf[4] != RTJPEG_HEADER_SIZE ||
220 buf[5] != RTJPEG_FILE_VERSION) {
221 av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame\n");
222 return AVERROR_INVALIDDATA;
224 w = AV_RL16(&buf[6]);
225 h = AV_RL16(&buf[8]);
227 if ((result = codec_reinit(avctx, w, h, q)) < 0)
229 if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO)
231 buf = &buf[RTJPEG_HEADER_SIZE];
232 buf_size -= RTJPEG_HEADER_SIZE;
236 av_frame_unref(c->pic);
240 result = ff_reget_buffer(avctx, c->pic);
242 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
246 memset(c->pic->data[0], 0, avctx->height * c->pic->linesize[0]);
247 memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2);
248 memset(c->pic->data[2], 0x80, avctx->height * c->pic->linesize[2] / 2);
251 c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
252 c->pic->key_frame = keyframe;
253 // decompress/copy/whatever data
256 case NUV_UNCOMPRESSED: {
257 int height = c->height;
258 if (buf_size < c->width * height * 3 / 2) {
259 av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
260 height = buf_size / c->width / 3 * 2;
262 copy_frame(c->pic, buf, c->width, height);
265 case NUV_RTJPEG_IN_LZO:
267 ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
272 memset(c->pic->data[0], 0, c->width * c->height);
273 memset(c->pic->data[1], 128, c->width * c->height / 4);
274 memset(c->pic->data[2], 128, c->width * c->height / 4);
277 /* nothing more to do here */
280 av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
281 return AVERROR_INVALIDDATA;
284 if ((result = av_frame_ref(picture, c->pic)) < 0)
291 static av_cold int decode_init(AVCodecContext *avctx)
293 NuvContext *c = avctx->priv_data;
296 c->pic = av_frame_alloc();
298 return AVERROR(ENOMEM);
300 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
301 c->decomp_buf = NULL;
306 c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
308 if (avctx->extradata_size)
309 get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
311 ff_rtjpeg_init(&c->rtj, avctx);
313 if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
319 static av_cold int decode_end(AVCodecContext *avctx)
321 NuvContext *c = avctx->priv_data;
323 av_freep(&c->decomp_buf);
324 av_frame_free(&c->pic);
329 AVCodec ff_nuv_decoder = {
331 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
332 .type = AVMEDIA_TYPE_VIDEO,
333 .id = AV_CODEC_ID_NUV,
334 .priv_data_size = sizeof(NuvContext),
337 .decode = decode_frame,
338 .capabilities = AV_CODEC_CAP_DR1,