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path: root/libavcodec/nuv.c (plain)
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1/*
2 * NuppelVideo decoder
3 * Copyright (c) 2006 Reimar Doeffinger
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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#include <limits.h>
25
26#include "libavutil/bswap.h"
27#include "libavutil/common.h"
28#include "libavutil/intreadwrite.h"
29#include "libavutil/lzo.h"
30#include "libavutil/imgutils.h"
31#include "avcodec.h"
32#include "idctdsp.h"
33#include "internal.h"
34#include "rtjpeg.h"
35
36typedef struct NuvContext {
37 AVFrame *pic;
38 int codec_frameheader;
39 int quality;
40 int width, height;
41 unsigned int decomp_size;
42 unsigned char *decomp_buf;
43 uint32_t lq[64], cq[64];
44 RTJpegContext rtj;
45} NuvContext;
46
47static const uint8_t fallback_lquant[] = {
48 16, 11, 10, 16, 24, 40, 51, 61,
49 12, 12, 14, 19, 26, 58, 60, 55,
50 14, 13, 16, 24, 40, 57, 69, 56,
51 14, 17, 22, 29, 51, 87, 80, 62,
52 18, 22, 37, 56, 68, 109, 103, 77,
53 24, 35, 55, 64, 81, 104, 113, 92,
54 49, 64, 78, 87, 103, 121, 120, 101,
55 72, 92, 95, 98, 112, 100, 103, 99
56};
57
58static const uint8_t fallback_cquant[] = {
59 17, 18, 24, 47, 99, 99, 99, 99,
60 18, 21, 26, 66, 99, 99, 99, 99,
61 24, 26, 56, 99, 99, 99, 99, 99,
62 47, 66, 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,
66 99, 99, 99, 99, 99, 99, 99, 99
67};
68
69/**
70 * @brief copy frame data from buffer to AVFrame, handling stride.
71 * @param f destination AVFrame
72 * @param src source buffer, does not use any line-stride
73 * @param width width of the video frame
74 * @param height height of the video frame
75 */
76static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
77{
78 uint8_t *src_data[4];
79 int src_linesize[4];
80 av_image_fill_arrays(src_data, src_linesize, src,
81 f->format, width, height, 1);
82 av_image_copy(f->data, f->linesize, (const uint8_t **)src_data, src_linesize,
83 f->format, width, height);
84}
85
86/**
87 * @brief extract quantization tables from codec data into our context
88 */
89static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
90 int size)
91{
92 int i;
93 if (size < 2 * 64 * 4) {
94 av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
95 return AVERROR_INVALIDDATA;
96 }
97 for (i = 0; i < 64; i++, buf += 4)
98 c->lq[i] = AV_RL32(buf);
99 for (i = 0; i < 64; i++, buf += 4)
100 c->cq[i] = AV_RL32(buf);
101 return 0;
102}
103
104/**
105 * @brief set quantization tables from a quality value
106 */
107static void get_quant_quality(NuvContext *c, int quality)
108{
109 int i;
110 quality = FFMAX(quality, 1);
111 for (i = 0; i < 64; i++) {
112 c->lq[i] = (fallback_lquant[i] << 7) / quality;
113 c->cq[i] = (fallback_cquant[i] << 7) / quality;
114 }
115}
116
117static int codec_reinit(AVCodecContext *avctx, int width, int height,
118 int quality)
119{
120 NuvContext *c = avctx->priv_data;
121 int ret;
122
123 width = FFALIGN(width, 2);
124 height = FFALIGN(height, 2);
125 if (quality >= 0)
126 get_quant_quality(c, quality);
127 if (width != c->width || height != c->height) {
128 // also reserve space for a possible additional header
129 int buf_size = height * width * 3 / 2
130 + FFMAX(AV_LZO_OUTPUT_PADDING, AV_INPUT_BUFFER_PADDING_SIZE)
131 + RTJPEG_HEADER_SIZE;
132 if (buf_size > INT_MAX/8)
133 return -1;
134 if ((ret = av_image_check_size(height, width, 0, avctx)) < 0)
135 return ret;
136 avctx->width = c->width = width;
137 avctx->height = c->height = height;
138 av_fast_malloc(&c->decomp_buf, &c->decomp_size,
139 buf_size);
140 if (!c->decomp_buf) {
141 av_log(avctx, AV_LOG_ERROR,
142 "Can't allocate decompression buffer.\n");
143 return AVERROR(ENOMEM);
144 }
145 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
146 av_frame_unref(c->pic);
147 return 1;
148 } else if (quality != c->quality)
149 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
150
151 return 0;
152}
153
154static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
155 AVPacket *avpkt)
156{
157 const uint8_t *buf = avpkt->data;
158 int buf_size = avpkt->size;
159 NuvContext *c = avctx->priv_data;
160 AVFrame *picture = data;
161 int orig_size = buf_size;
162 int keyframe, ret;
163 int size_change = 0;
164 int result, init_frame = !avctx->frame_number;
165 enum {
166 NUV_UNCOMPRESSED = '0',
167 NUV_RTJPEG = '1',
168 NUV_RTJPEG_IN_LZO = '2',
169 NUV_LZO = '3',
170 NUV_BLACK = 'N',
171 NUV_COPY_LAST = 'L'
172 } comptype;
173
174 if (buf_size < 12) {
175 av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
176 return AVERROR_INVALIDDATA;
177 }
178
179 // codec data (rtjpeg quant tables)
180 if (buf[0] == 'D' && buf[1] == 'R') {
181 int ret;
182 // Skip the rest of the frame header.
183 buf = &buf[12];
184 buf_size -= 12;
185 ret = get_quant(avctx, c, buf, buf_size);
186 if (ret < 0)
187 return ret;
188 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
189 return orig_size;
190 }
191
192 if (buf_size < 12 || buf[0] != 'V') {
193 av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
194 return AVERROR_INVALIDDATA;
195 }
196 comptype = buf[1];
197 switch (comptype) {
198 case NUV_RTJPEG_IN_LZO:
199 case NUV_RTJPEG:
200 keyframe = !buf[2];
201 break;
202 case NUV_COPY_LAST:
203 keyframe = 0;
204 break;
205 default:
206 keyframe = 1;
207 break;
208 }
209retry:
210 // Skip the rest of the frame header.
211 buf = &buf[12];
212 buf_size -= 12;
213 if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
214 int outlen = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING);
215 int inlen = buf_size;
216 if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
217 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
218 return AVERROR_INVALIDDATA;
219 }
220 buf = c->decomp_buf;
221 buf_size = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING) - outlen;
222 memset(c->decomp_buf + buf_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
223 }
224 if (c->codec_frameheader) {
225 int w, h, q;
226 if (buf_size < RTJPEG_HEADER_SIZE) {
227 av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n");
228 return AVERROR_INVALIDDATA;
229 }
230 // There seem to exist two variants of this header: one starts with 'V'
231 // and 5 bytes unknown, the other matches current MythTV and is 4 bytes size,
232 // 1 byte header size (== 12), 1 byte version (== 0)
233 if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) {
234 av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\n");
235 return AVERROR_INVALIDDATA;
236 }
237 w = AV_RL16(&buf[6]);
238 h = AV_RL16(&buf[8]);
239 q = buf[10];
240 if ((result = codec_reinit(avctx, w, h, q)) < 0)
241 return result;
242 if (result) {
243 buf = avpkt->data;
244 buf_size = avpkt->size;
245 size_change = 1;
246 goto retry;
247 }
248 buf = &buf[RTJPEG_HEADER_SIZE];
249 buf_size -= RTJPEG_HEADER_SIZE;
250 }
251
252 if (size_change || keyframe) {
253 av_frame_unref(c->pic);
254 init_frame = 1;
255 }
256
257 if ((result = ff_reget_buffer(avctx, c->pic)) < 0)
258 return result;
259 if (init_frame) {
260 memset(c->pic->data[0], 0, avctx->height * c->pic->linesize[0]);
261 memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2);
262 memset(c->pic->data[2], 0x80, avctx->height * c->pic->linesize[2] / 2);
263 }
264
265 c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
266 c->pic->key_frame = keyframe;
267 // decompress/copy/whatever data
268 switch (comptype) {
269 case NUV_LZO:
270 case NUV_UNCOMPRESSED: {
271 int height = c->height;
272 if (buf_size < c->width * height * 3 / 2) {
273 av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
274 height = buf_size / c->width / 3 * 2;
275 }
276 if(height > 0)
277 copy_frame(c->pic, buf, c->width, height);
278 break;
279 }
280 case NUV_RTJPEG_IN_LZO:
281 case NUV_RTJPEG:
282 ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
283 if (ret < 0)
284 return ret;
285 break;
286 case NUV_BLACK:
287 memset(c->pic->data[0], 0, c->width * c->height);
288 memset(c->pic->data[1], 128, c->width * c->height / 4);
289 memset(c->pic->data[2], 128, c->width * c->height / 4);
290 break;
291 case NUV_COPY_LAST:
292 /* nothing more to do here */
293 break;
294 default:
295 av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
296 return AVERROR_INVALIDDATA;
297 }
298
299 if ((result = av_frame_ref(picture, c->pic)) < 0)
300 return result;
301
302 *got_frame = 1;
303 return orig_size;
304}
305
306static av_cold int decode_init(AVCodecContext *avctx)
307{
308 NuvContext *c = avctx->priv_data;
309 int ret;
310
311 c->pic = av_frame_alloc();
312 if (!c->pic)
313 return AVERROR(ENOMEM);
314
315 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
316 c->decomp_buf = NULL;
317 c->quality = -1;
318 c->width = 0;
319 c->height = 0;
320
321 c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
322
323 if (avctx->extradata_size)
324 get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
325
326 ff_rtjpeg_init(&c->rtj, avctx);
327
328 if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
329 return ret;
330
331 return 0;
332}
333
334static av_cold int decode_end(AVCodecContext *avctx)
335{
336 NuvContext *c = avctx->priv_data;
337
338 av_freep(&c->decomp_buf);
339 av_frame_free(&c->pic);
340
341 return 0;
342}
343
344AVCodec ff_nuv_decoder = {
345 .name = "nuv",
346 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
347 .type = AVMEDIA_TYPE_VIDEO,
348 .id = AV_CODEC_ID_NUV,
349 .priv_data_size = sizeof(NuvContext),
350 .init = decode_init,
351 .close = decode_end,
352 .decode = decode_frame,
353 .capabilities = AV_CODEC_CAP_DR1,
354};
355
generated by cgit at 2024-05-17 03:09:44 (GMT)