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/bswap.h"
26 #include "libavutil/lzo.h"
27 #include "libavutil/imgutils.h"
34 int codec_frameheader;
37 unsigned int decomp_size;
38 unsigned char* decomp_buf;
39 uint32_t lq[64], cq[64];
44 static const uint8_t fallback_lquant[] = {
45 16, 11, 10, 16, 24, 40, 51, 61,
46 12, 12, 14, 19, 26, 58, 60, 55,
47 14, 13, 16, 24, 40, 57, 69, 56,
48 14, 17, 22, 29, 51, 87, 80, 62,
49 18, 22, 37, 56, 68, 109, 103, 77,
50 24, 35, 55, 64, 81, 104, 113, 92,
51 49, 64, 78, 87, 103, 121, 120, 101,
52 72, 92, 95, 98, 112, 100, 103, 99
55 static const uint8_t fallback_cquant[] = {
56 17, 18, 24, 47, 99, 99, 99, 99,
57 18, 21, 26, 66, 99, 99, 99, 99,
58 24, 26, 56, 99, 99, 99, 99, 99,
59 47, 66, 99, 99, 99, 99, 99, 99,
60 99, 99, 99, 99, 99, 99, 99, 99,
61 99, 99, 99, 99, 99, 99, 99, 99,
62 99, 99, 99, 99, 99, 99, 99, 99,
63 99, 99, 99, 99, 99, 99, 99, 99
67 * @brief copy frame data from buffer to AVFrame, handling stride.
68 * @param f destination AVFrame
69 * @param src source buffer, does not use any line-stride
70 * @param width width of the video frame
71 * @param height height of the video frame
73 static void copy_frame(AVFrame *f, const uint8_t *src,
74 int width, int height) {
76 avpicture_fill(&pic, src, PIX_FMT_YUV420P, width, height);
77 av_picture_copy((AVPicture *)f, &pic, PIX_FMT_YUV420P, width, height);
81 * @brief extract quantization tables from codec data into our context
83 static int get_quant(AVCodecContext *avctx, NuvContext *c,
84 const uint8_t *buf, int size) {
86 if (size < 2 * 64 * 4) {
87 av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
90 for (i = 0; i < 64; i++, buf += 4)
91 c->lq[i] = AV_RL32(buf);
92 for (i = 0; i < 64; i++, buf += 4)
93 c->cq[i] = AV_RL32(buf);
98 * @brief set quantization tables from a quality value
100 static void get_quant_quality(NuvContext *c, int quality) {
102 quality = FFMAX(quality, 1);
103 for (i = 0; i < 64; i++) {
104 c->lq[i] = (fallback_lquant[i] << 7) / quality;
105 c->cq[i] = (fallback_cquant[i] << 7) / quality;
109 static int codec_reinit(AVCodecContext *avctx, int width, int height, int quality) {
110 NuvContext *c = avctx->priv_data;
111 width = FFALIGN(width, 2);
112 height = FFALIGN(height, 2);
114 get_quant_quality(c, quality);
115 if (width != c->width || height != c->height) {
116 // also reserve space for a possible additional header
117 int buf_size = 24 + height * width * 3 / 2 + AV_LZO_OUTPUT_PADDING;
118 if (av_image_check_size(height, width, 0, avctx) < 0 ||
119 buf_size > INT_MAX/8)
121 avctx->width = c->width = width;
122 avctx->height = c->height = height;
123 av_fast_malloc(&c->decomp_buf, &c->decomp_size, buf_size);
124 if (!c->decomp_buf) {
125 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
126 return AVERROR(ENOMEM);
128 rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
130 } else if (quality != c->quality)
131 rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
135 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
137 const uint8_t *buf = avpkt->data;
138 int buf_size = avpkt->size;
139 NuvContext *c = avctx->priv_data;
140 AVFrame *picture = data;
141 int orig_size = buf_size;
145 enum {NUV_UNCOMPRESSED = '0', NUV_RTJPEG = '1',
146 NUV_RTJPEG_IN_LZO = '2', NUV_LZO = '3',
147 NUV_BLACK = 'N', NUV_COPY_LAST = 'L'} comptype;
150 av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
154 // codec data (rtjpeg quant tables)
155 if (buf[0] == 'D' && buf[1] == 'R') {
157 // skip rest of the frameheader.
160 ret = get_quant(avctx, c, buf, buf_size);
163 rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
167 if (buf[0] != 'V' || buf_size < 12) {
168 av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
173 case NUV_RTJPEG_IN_LZO:
175 keyframe = !buf[2]; break;
182 // skip rest of the frameheader.
185 if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
186 int outlen = c->decomp_size - AV_LZO_OUTPUT_PADDING, inlen = buf_size;
187 if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
188 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
190 buf_size = c->decomp_size - AV_LZO_OUTPUT_PADDING - outlen;
192 if (c->codec_frameheader) {
194 if (buf[0] != 'V' || buf_size < 12) {
195 av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame (wrong codec_tag?)\n");
196 return AVERROR_INVALIDDATA;
198 w = AV_RL16(&buf[6]);
199 h = AV_RL16(&buf[8]);
201 res = codec_reinit(avctx, w, h, q);
206 buf_size = avpkt->size;
214 if ((size_change || keyframe) && c->pic.data[0])
215 avctx->release_buffer(avctx, &c->pic);
216 c->pic.reference = 3;
217 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
218 FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
219 result = avctx->reget_buffer(avctx, &c->pic);
221 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
225 c->pic.pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
226 c->pic.key_frame = keyframe;
227 // decompress/copy/whatever data
230 case NUV_UNCOMPRESSED: {
231 int height = c->height;
232 if (buf_size < c->width * height * 3 / 2) {
233 av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
234 height = buf_size / c->width / 3 * 2;
236 copy_frame(&c->pic, buf, c->width, height);
239 case NUV_RTJPEG_IN_LZO:
241 rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
245 memset(c->pic.data[0], 0, c->width * c->height);
246 memset(c->pic.data[1], 128, c->width * c->height / 4);
247 memset(c->pic.data[2], 128, c->width * c->height / 4);
250 case NUV_COPY_LAST: {
251 /* nothing more to do here */
255 av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
260 *data_size = sizeof(AVFrame);
264 static av_cold int decode_init(AVCodecContext *avctx) {
265 NuvContext *c = avctx->priv_data;
266 avctx->pix_fmt = PIX_FMT_YUV420P;
267 c->pic.data[0] = NULL;
268 c->decomp_buf = NULL;
272 c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
273 if (avctx->extradata_size)
274 get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
275 dsputil_init(&c->dsp, avctx);
276 if (codec_reinit(avctx, avctx->width, avctx->height, -1) < 0)
281 static av_cold int decode_end(AVCodecContext *avctx) {
282 NuvContext *c = avctx->priv_data;
283 av_freep(&c->decomp_buf);
285 avctx->release_buffer(avctx, &c->pic);
289 AVCodec ff_nuv_decoder = {
291 .type = AVMEDIA_TYPE_VIDEO,
293 .priv_data_size = sizeof(NuvContext),
296 .decode = decode_frame,
297 .capabilities = CODEC_CAP_DR1,
298 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),