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
25 #include "libavutil/common.h"
26 #include "libavutil/intreadwrite.h"
27 #include "libavutil/lzo.h"
28 #include "libavutil/imgutils.h"
30 #include "codec_internal.h"
32 #include "jpegquanttables.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];
47 * @brief copy frame data from buffer to AVFrame, handling stride.
48 * @param f destination AVFrame
49 * @param src source buffer, does not use any line-stride
50 * @param width width of the video frame
51 * @param height height of the video frame
53 static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
57 av_image_fill_arrays(src_data, src_linesize, src,
58 f->format, width, height, 1);
59 av_image_copy2(f->data, f->linesize, src_data, src_linesize,
60 f->format, width, height);
64 * @brief extract quantization tables from codec data into our context
66 static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
70 if (size < 2 * 64 * 4) {
71 av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
72 return AVERROR_INVALIDDATA;
74 for (i = 0; i < 64; i++, buf += 4)
75 c->lq[i] = AV_RL32(buf);
76 for (i = 0; i < 64; i++, buf += 4)
77 c->cq[i] = AV_RL32(buf);
82 * @brief set quantization tables from a quality value
84 static void get_quant_quality(NuvContext *c, int quality)
87 quality = FFMAX(quality, 1);
88 for (i = 0; i < 64; i++) {
89 c->lq[i] = (ff_mjpeg_std_luminance_quant_tbl[i] << 7) / quality;
90 c->cq[i] = (ff_mjpeg_std_chrominance_quant_tbl[i] << 7) / quality;
94 static int codec_reinit(AVCodecContext *avctx, int width, int height,
97 NuvContext *c = avctx->priv_data;
100 width = FFALIGN(width, 2);
101 height = FFALIGN(height, 2);
103 get_quant_quality(c, quality);
104 if (width != c->width || height != c->height) {
105 // also reserve space for a possible additional header
106 int64_t buf_size = height * (int64_t)width * 3 / 2
107 + FFMAX(AV_LZO_OUTPUT_PADDING, AV_INPUT_BUFFER_PADDING_SIZE)
108 + RTJPEG_HEADER_SIZE;
109 if (buf_size > INT_MAX/8)
111 if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
115 av_fast_malloc(&c->decomp_buf, &c->decomp_size,
117 if (!c->decomp_buf) {
118 av_log(avctx, AV_LOG_ERROR,
119 "Can't allocate decompression buffer.\n");
120 return AVERROR(ENOMEM);
122 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
123 av_frame_unref(c->pic);
125 } else if (quality != c->quality)
126 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
131 static int decode_frame(AVCodecContext *avctx, AVFrame *picture,
132 int *got_frame, AVPacket *avpkt)
134 const uint8_t *buf = avpkt->data;
135 int buf_size = avpkt->size;
136 NuvContext *c = avctx->priv_data;
137 int orig_size = buf_size;
142 int result, init_frame = !avctx->frame_num;
144 NUV_UNCOMPRESSED = '0',
146 NUV_RTJPEG_IN_LZO = '2',
153 av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
154 return AVERROR_INVALIDDATA;
157 // codec data (rtjpeg quant tables)
158 if (buf[0] == 'D' && buf[1] == 'R') {
160 // Skip the rest of the frame header.
163 ret = get_quant(avctx, c, buf, buf_size);
166 ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
170 if (buf_size < 12 || buf[0] != 'V') {
171 av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
172 return AVERROR_INVALIDDATA;
176 case NUV_RTJPEG_IN_LZO:
179 if (c->width < 16 || c->height < 16) {
180 return AVERROR_INVALIDDATA;
184 flags |= FF_REGET_BUFFER_FLAG_READONLY;
192 case NUV_UNCOMPRESSED:
193 minsize = c->width * c->height * 3 / 2;
196 minsize = c->width/16 * (c->height/16) * 6;
201 case NUV_RTJPEG_IN_LZO:
204 av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
205 return AVERROR_INVALIDDATA;
207 if (buf_size < minsize / 4)
208 return AVERROR_INVALIDDATA;
210 // Skip the rest of the frame header.
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;
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);
224 if (c->codec_frameheader) {
226 if (buf_size < RTJPEG_HEADER_SIZE) {
227 av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n");
228 return AVERROR_INVALIDDATA;
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;
237 w = AV_RL16(&buf[6]);
238 h = AV_RL16(&buf[8]);
240 if ((result = codec_reinit(avctx, w, h, q)) < 0)
244 buf_size = avpkt->size;
248 buf = &buf[RTJPEG_HEADER_SIZE];
249 buf_size -= RTJPEG_HEADER_SIZE;
252 if (size_change || keyframe) {
253 av_frame_unref(c->pic);
257 if ((result = ff_reget_buffer(avctx, c->pic, flags)) < 0)
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);
265 c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
267 c->pic->flags |= AV_FRAME_FLAG_KEY;
269 c->pic->flags &= ~AV_FRAME_FLAG_KEY;
270 // decompress/copy/whatever data
273 case NUV_UNCOMPRESSED: {
274 int height = c->height;
275 if (buf_size < c->width * height * 3 / 2) {
276 av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
277 height = buf_size / c->width / 3 * 2;
280 copy_frame(c->pic, buf, c->width, height);
283 case NUV_RTJPEG_IN_LZO:
285 ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
290 memset(c->pic->data[0], 0, c->width * c->height);
291 memset(c->pic->data[1], 128, c->width * c->height / 4);
292 memset(c->pic->data[2], 128, c->width * c->height / 4);
295 /* nothing more to do here */
299 if ((result = av_frame_ref(picture, c->pic)) < 0)
306 static av_cold int decode_init(AVCodecContext *avctx)
308 NuvContext *c = avctx->priv_data;
311 c->pic = av_frame_alloc();
313 return AVERROR(ENOMEM);
315 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
316 c->decomp_buf = NULL;
321 c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
323 if (avctx->extradata_size)
324 get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
326 ff_rtjpeg_init(&c->rtj, avctx);
328 if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
334 static av_cold int decode_end(AVCodecContext *avctx)
336 NuvContext *c = avctx->priv_data;
338 av_freep(&c->decomp_buf);
339 av_frame_free(&c->pic);
344 const FFCodec ff_nuv_decoder = {
346 CODEC_LONG_NAME("NuppelVideo/RTJPEG"),
347 .p.type = AVMEDIA_TYPE_VIDEO,
348 .p.id = AV_CODEC_ID_NUV,
349 .priv_data_size = sizeof(NuvContext),
352 FF_CODEC_DECODE_CB(decode_frame),
353 .p.capabilities = AV_CODEC_CAP_DR1,
354 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,