3 * Copyright (c) 2006 Reimar Doeffinger
5 * This file is part of FFmpeg.
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.
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.
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
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"
36 typedef struct NuvContext {
38 int codec_frameheader;
41 unsigned int decomp_size;
42 unsigned char *decomp_buf;
43 uint32_t lq[64], cq[64];
47 static 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
58 static 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
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
76 static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
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);
87 * @brief extract quantization tables from codec data into our context
89 static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
93 if (size < 2 * 64 * 4) {
94 av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
95 return AVERROR_INVALIDDATA;
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);
105 * @brief set quantization tables from a quality value
107 static void get_quant_quality(NuvContext *c, int quality)
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;
117 static int codec_reinit(AVCodecContext *avctx, int width, int height,
120 NuvContext *c = avctx->priv_data;
123 width = FFALIGN(width, 2);
124 height = FFALIGN(height, 2);
126 get_quant_quality(c, quality);
127 if (width != c->width || height != c->height) {
128 // also reserve space for a possible additional header
129 int64_t buf_size = height * (int64_t)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)
134 if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
138 av_fast_malloc(&c->decomp_buf, &c->decomp_size,
140 if (!c->decomp_buf) {
141 av_log(avctx, AV_LOG_ERROR,
142 "Can't allocate decompression buffer.\n");
143 return AVERROR(ENOMEM);
145 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
146 av_frame_unref(c->pic);
148 } else if (quality != c->quality)
149 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
154 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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;
166 int result, init_frame = !avctx->frame_number;
168 NUV_UNCOMPRESSED = '0',
170 NUV_RTJPEG_IN_LZO = '2',
177 av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
178 return AVERROR_INVALIDDATA;
181 // codec data (rtjpeg quant tables)
182 if (buf[0] == 'D' && buf[1] == 'R') {
184 // Skip the rest of the frame header.
187 ret = get_quant(avctx, c, buf, buf_size);
190 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
194 if (buf_size < 12 || buf[0] != 'V') {
195 av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
196 return AVERROR_INVALIDDATA;
200 case NUV_RTJPEG_IN_LZO:
203 if (c->width < 16 || c->height < 16) {
204 return AVERROR_INVALIDDATA;
208 flags |= FF_REGET_BUFFER_FLAG_READONLY;
216 case NUV_UNCOMPRESSED:
217 minsize = c->width * c->height * 3 / 2;
220 minsize = c->width/16 * (c->height/16) * 6;
225 case NUV_RTJPEG_IN_LZO:
228 av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
229 return AVERROR_INVALIDDATA;
231 if (buf_size < minsize / 4)
232 return AVERROR_INVALIDDATA;
234 // Skip the rest of the frame header.
237 if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
238 int outlen = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING);
239 int inlen = buf_size;
240 if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
241 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
242 return AVERROR_INVALIDDATA;
245 buf_size = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING) - outlen;
246 memset(c->decomp_buf + buf_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
248 if (c->codec_frameheader) {
250 if (buf_size < RTJPEG_HEADER_SIZE) {
251 av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n");
252 return AVERROR_INVALIDDATA;
254 // There seem to exist two variants of this header: one starts with 'V'
255 // and 5 bytes unknown, the other matches current MythTV and is 4 bytes size,
256 // 1 byte header size (== 12), 1 byte version (== 0)
257 if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) {
258 av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\n");
259 return AVERROR_INVALIDDATA;
261 w = AV_RL16(&buf[6]);
262 h = AV_RL16(&buf[8]);
264 if ((result = codec_reinit(avctx, w, h, q)) < 0)
268 buf_size = avpkt->size;
272 buf = &buf[RTJPEG_HEADER_SIZE];
273 buf_size -= RTJPEG_HEADER_SIZE;
276 if (size_change || keyframe) {
277 av_frame_unref(c->pic);
281 if ((result = ff_reget_buffer(avctx, c->pic, flags)) < 0)
284 memset(c->pic->data[0], 0, avctx->height * c->pic->linesize[0]);
285 memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2);
286 memset(c->pic->data[2], 0x80, avctx->height * c->pic->linesize[2] / 2);
289 c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
290 c->pic->key_frame = keyframe;
291 // decompress/copy/whatever data
294 case NUV_UNCOMPRESSED: {
295 int height = c->height;
296 if (buf_size < c->width * height * 3 / 2) {
297 av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
298 height = buf_size / c->width / 3 * 2;
301 copy_frame(c->pic, buf, c->width, height);
304 case NUV_RTJPEG_IN_LZO:
306 ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
311 memset(c->pic->data[0], 0, c->width * c->height);
312 memset(c->pic->data[1], 128, c->width * c->height / 4);
313 memset(c->pic->data[2], 128, c->width * c->height / 4);
316 /* nothing more to do here */
320 if ((result = av_frame_ref(picture, c->pic)) < 0)
327 static av_cold int decode_init(AVCodecContext *avctx)
329 NuvContext *c = avctx->priv_data;
332 c->pic = av_frame_alloc();
334 return AVERROR(ENOMEM);
336 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
337 c->decomp_buf = NULL;
342 c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
344 if (avctx->extradata_size)
345 get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
347 ff_rtjpeg_init(&c->rtj, avctx);
349 if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
355 static av_cold int decode_end(AVCodecContext *avctx)
357 NuvContext *c = avctx->priv_data;
359 av_freep(&c->decomp_buf);
360 av_frame_free(&c->pic);
365 AVCodec ff_nuv_decoder = {
367 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
368 .type = AVMEDIA_TYPE_VIDEO,
369 .id = AV_CODEC_ID_NUV,
370 .priv_data_size = sizeof(NuvContext),
373 .decode = decode_frame,
374 .capabilities = AV_CODEC_CAP_DR1,
375 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,