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/lzo.h"
29 #include "libavutil/imgutils.h"
36 int codec_frameheader;
39 unsigned int decomp_size;
40 unsigned char *decomp_buf;
41 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)
78 avpicture_fill(&pic, src, AV_PIX_FMT_YUV420P, width, height);
79 av_picture_copy((AVPicture *)f, &pic, AV_PIX_FMT_YUV420P, width, height);
83 * @brief extract quantization tables from codec data into our context
85 static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
89 if (size < 2 * 64 * 4) {
90 av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
91 return AVERROR_INVALIDDATA;
93 for (i = 0; i < 64; i++, buf += 4)
94 c->lq[i] = AV_RL32(buf);
95 for (i = 0; i < 64; i++, buf += 4)
96 c->cq[i] = AV_RL32(buf);
101 * @brief set quantization tables from a quality value
103 static void get_quant_quality(NuvContext *c, int quality)
106 quality = FFMAX(quality, 1);
107 for (i = 0; i < 64; i++) {
108 c->lq[i] = (fallback_lquant[i] << 7) / quality;
109 c->cq[i] = (fallback_cquant[i] << 7) / quality;
113 static int codec_reinit(AVCodecContext *avctx, int width, int height,
116 NuvContext *c = avctx->priv_data;
119 width = FFALIGN(width, 2);
120 height = FFALIGN(height, 2);
122 get_quant_quality(c, quality);
123 if (width != c->width || height != c->height) {
124 // also reserve space for a possible additional header
125 int buf_size = height * width * 3 / 2
126 + FFMAX(AV_LZO_OUTPUT_PADDING, FF_INPUT_BUFFER_PADDING_SIZE)
127 + RTJPEG_HEADER_SIZE;
128 if (buf_size > INT_MAX/8)
130 if ((ret = av_image_check_size(height, width, 0, avctx)) < 0)
132 avctx->width = c->width = width;
133 avctx->height = c->height = height;
134 av_fast_malloc(&c->decomp_buf, &c->decomp_size,
136 if (!c->decomp_buf) {
137 av_log(avctx, AV_LOG_ERROR,
138 "Can't allocate decompression buffer.\n");
139 return AVERROR(ENOMEM);
141 ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height,
143 av_frame_unref(c->pic);
145 } else if (quality != c->quality)
146 ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height,
152 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
155 const uint8_t *buf = avpkt->data;
156 int buf_size = avpkt->size;
157 NuvContext *c = avctx->priv_data;
158 AVFrame *picture = data;
159 int orig_size = buf_size;
162 int result, init_frame = !avctx->frame_number;
164 NUV_UNCOMPRESSED = '0',
166 NUV_RTJPEG_IN_LZO = '2',
173 av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
174 return AVERROR_INVALIDDATA;
177 // codec data (rtjpeg quant tables)
178 if (buf[0] == 'D' && buf[1] == 'R') {
180 // skip rest of the frameheader.
183 ret = get_quant(avctx, c, buf, buf_size);
186 ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq,
191 if (buf_size < 12 || buf[0] != 'V') {
192 av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
193 return AVERROR_INVALIDDATA;
197 case NUV_RTJPEG_IN_LZO:
209 // skip rest of the frameheader.
212 if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
213 int outlen = c->decomp_size - FFMAX(FF_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING);
214 int inlen = buf_size;
215 if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
216 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
217 return AVERROR_INVALIDDATA;
220 buf_size = c->decomp_size - FFMAX(FF_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING) - outlen;
222 if (c->codec_frameheader) {
224 if (buf_size < RTJPEG_HEADER_SIZE) {
225 av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n");
226 return AVERROR_INVALIDDATA;
228 // There seem to exist two variants of this header: one starts with 'V'
229 // and 5 bytes unknown, the other matches current MythTV and is 4 bytes size,
230 // 1 byte header size (== 12), 1 byte version (== 0)
231 if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) {
232 av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\n");
233 return AVERROR_INVALIDDATA;
235 w = AV_RL16(&buf[6]);
236 h = AV_RL16(&buf[8]);
238 if ((result = codec_reinit(avctx, w, h, q)) < 0)
242 buf_size = avpkt->size;
246 buf = &buf[RTJPEG_HEADER_SIZE];
247 buf_size -= RTJPEG_HEADER_SIZE;
250 if (size_change || keyframe) {
251 av_frame_unref(c->pic);
255 if ((result = ff_reget_buffer(avctx, c->pic)) < 0)
258 memset(c->pic->data[0], 0, avctx->height * c->pic->linesize[0]);
259 memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2);
260 memset(c->pic->data[2], 0x80, avctx->height * c->pic->linesize[2] / 2);
263 c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
264 c->pic->key_frame = keyframe;
265 // decompress/copy/whatever data
268 case NUV_UNCOMPRESSED: {
269 int height = c->height;
270 if (buf_size < c->width * height * 3 / 2) {
271 av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
272 height = buf_size / c->width / 3 * 2;
275 copy_frame(c->pic, buf, c->width, height);
278 case NUV_RTJPEG_IN_LZO:
280 ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
285 memset(c->pic->data[0], 0, c->width * c->height);
286 memset(c->pic->data[1], 128, c->width * c->height / 4);
287 memset(c->pic->data[2], 128, c->width * c->height / 4);
290 /* nothing more to do here */
293 av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
294 return AVERROR_INVALIDDATA;
297 if ((result = av_frame_ref(picture, c->pic)) < 0)
304 static av_cold int decode_init(AVCodecContext *avctx)
306 NuvContext *c = avctx->priv_data;
309 c->pic = av_frame_alloc();
311 return AVERROR(ENOMEM);
313 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
314 c->decomp_buf = NULL;
319 c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
321 if (avctx->extradata_size)
322 get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
324 ff_dsputil_init(&c->dsp, avctx);
326 if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
332 static av_cold int decode_end(AVCodecContext *avctx)
334 NuvContext *c = avctx->priv_data;
336 av_freep(&c->decomp_buf);
337 av_frame_free(&c->pic);
342 AVCodec ff_nuv_decoder = {
344 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
345 .type = AVMEDIA_TYPE_VIDEO,
346 .id = AV_CODEC_ID_NUV,
347 .priv_data_size = sizeof(NuvContext),
350 .decode = decode_frame,
351 .capabilities = CODEC_CAP_DR1,