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"
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)
79 avpicture_fill(&pic, src, AV_PIX_FMT_YUV420P, width, height);
80 av_picture_copy((AVPicture *)f, &pic, AV_PIX_FMT_YUV420P, width, height);
84 * @brief extract quantization tables from codec data into our context
86 static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
90 if (size < 2 * 64 * 4) {
91 av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
92 return AVERROR_INVALIDDATA;
94 for (i = 0; i < 64; i++, buf += 4)
95 c->lq[i] = AV_RL32(buf);
96 for (i = 0; i < 64; i++, buf += 4)
97 c->cq[i] = AV_RL32(buf);
102 * @brief set quantization tables from a quality value
104 static void get_quant_quality(NuvContext *c, int quality)
107 quality = FFMAX(quality, 1);
108 for (i = 0; i < 64; i++) {
109 c->lq[i] = (fallback_lquant[i] << 7) / quality;
110 c->cq[i] = (fallback_cquant[i] << 7) / quality;
114 static int codec_reinit(AVCodecContext *avctx, int width, int height,
117 NuvContext *c = avctx->priv_data;
120 width = FFALIGN(width, 2);
121 height = FFALIGN(height, 2);
123 get_quant_quality(c, quality);
124 if (width != c->width || height != c->height) {
125 // also reserve space for a possible additional header
126 int buf_size = height * width * 3 / 2
127 + FFMAX(AV_LZO_OUTPUT_PADDING, FF_INPUT_BUFFER_PADDING_SIZE)
128 + RTJPEG_HEADER_SIZE;
129 if (buf_size > INT_MAX/8)
131 if ((ret = av_image_check_size(height, width, 0, avctx)) < 0)
133 avctx->width = c->width = width;
134 avctx->height = c->height = height;
135 av_fast_malloc(&c->decomp_buf, &c->decomp_size,
137 if (!c->decomp_buf) {
138 av_log(avctx, AV_LOG_ERROR,
139 "Can't allocate decompression buffer.\n");
140 return AVERROR(ENOMEM);
142 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
143 av_frame_unref(c->pic);
145 } else if (quality != c->quality)
146 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
151 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
154 const uint8_t *buf = avpkt->data;
155 int buf_size = avpkt->size;
156 NuvContext *c = avctx->priv_data;
157 AVFrame *picture = data;
158 int orig_size = buf_size;
161 int result, init_frame = !avctx->frame_number;
163 NUV_UNCOMPRESSED = '0',
165 NUV_RTJPEG_IN_LZO = '2',
172 av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
173 return AVERROR_INVALIDDATA;
176 // codec data (rtjpeg quant tables)
177 if (buf[0] == 'D' && buf[1] == 'R') {
179 // skip rest of the frameheader.
182 ret = get_quant(avctx, c, buf, buf_size);
185 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
189 if (buf_size < 12 || buf[0] != 'V') {
190 av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
191 return AVERROR_INVALIDDATA;
195 case NUV_RTJPEG_IN_LZO:
207 // skip rest of the frameheader.
210 if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
211 int outlen = c->decomp_size - FFMAX(FF_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING);
212 int inlen = buf_size;
213 if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
214 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
215 return AVERROR_INVALIDDATA;
218 buf_size = c->decomp_size - FFMAX(FF_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING) - outlen;
219 memset(c->decomp_buf + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
221 if (c->codec_frameheader) {
223 if (buf_size < RTJPEG_HEADER_SIZE) {
224 av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n");
225 return AVERROR_INVALIDDATA;
227 // There seem to exist two variants of this header: one starts with 'V'
228 // and 5 bytes unknown, the other matches current MythTV and is 4 bytes size,
229 // 1 byte header size (== 12), 1 byte version (== 0)
230 if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) {
231 av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\n");
232 return AVERROR_INVALIDDATA;
234 w = AV_RL16(&buf[6]);
235 h = AV_RL16(&buf[8]);
237 if ((result = codec_reinit(avctx, w, h, q)) < 0)
241 buf_size = avpkt->size;
245 buf = &buf[RTJPEG_HEADER_SIZE];
246 buf_size -= RTJPEG_HEADER_SIZE;
249 if (size_change || keyframe) {
250 av_frame_unref(c->pic);
254 if ((result = ff_reget_buffer(avctx, c->pic)) < 0)
257 memset(c->pic->data[0], 0, avctx->height * c->pic->linesize[0]);
258 memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2);
259 memset(c->pic->data[2], 0x80, avctx->height * c->pic->linesize[2] / 2);
262 c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
263 c->pic->key_frame = keyframe;
264 // decompress/copy/whatever data
267 case NUV_UNCOMPRESSED: {
268 int height = c->height;
269 if (buf_size < c->width * height * 3 / 2) {
270 av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
271 height = buf_size / c->width / 3 * 2;
274 copy_frame(c->pic, buf, c->width, height);
277 case NUV_RTJPEG_IN_LZO:
279 ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
284 memset(c->pic->data[0], 0, c->width * c->height);
285 memset(c->pic->data[1], 128, c->width * c->height / 4);
286 memset(c->pic->data[2], 128, c->width * c->height / 4);
289 /* nothing more to do here */
292 av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
293 return AVERROR_INVALIDDATA;
296 if ((result = av_frame_ref(picture, c->pic)) < 0)
303 static av_cold int decode_init(AVCodecContext *avctx)
305 NuvContext *c = avctx->priv_data;
308 c->pic = av_frame_alloc();
310 return AVERROR(ENOMEM);
312 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
313 c->decomp_buf = NULL;
318 c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
320 if (avctx->extradata_size)
321 get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
323 ff_rtjpeg_init(&c->rtj, avctx);
325 if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
331 static av_cold int decode_end(AVCodecContext *avctx)
333 NuvContext *c = avctx->priv_data;
335 av_freep(&c->decomp_buf);
336 av_frame_free(&c->pic);
341 AVCodec ff_nuv_decoder = {
343 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
344 .type = AVMEDIA_TYPE_VIDEO,
345 .id = AV_CODEC_ID_NUV,
346 .priv_data_size = sizeof(NuvContext),
349 .decode = decode_frame,
350 .capabilities = CODEC_CAP_DR1,