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
35 unsigned int decomp_size;
36 unsigned char* decomp_buf;
37 uint32_t lq[64], cq[64];
43 * \brief copy frame data from buffer to AVFrame, handling stride.
44 * \param f destination AVFrame
45 * \param src source buffer, does not use any line-stride
46 * \param width width of the video frame
47 * \param height height of the video frame
49 static void copy_frame(AVFrame *f, uint8_t *src,
50 int width, int height) {
52 avpicture_fill(&pic, src, PIX_FMT_YUV420P, width, height);
53 img_copy((AVPicture *)f, &pic, PIX_FMT_YUV420P, width, height);
57 * \brief extract quantization tables from codec data into our context
59 static int get_quant(AVCodecContext *avctx, NuvContext *c,
60 uint8_t *buf, int size) {
62 if (size < 2 * 64 * 4) {
63 av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
66 for (i = 0; i < 64; i++, buf += 4)
67 c->lq[i] = AV_RL32(buf);
68 for (i = 0; i < 64; i++, buf += 4)
69 c->cq[i] = AV_RL32(buf);
73 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
74 uint8_t *buf, int buf_size) {
75 NuvContext *c = (NuvContext *)avctx->priv_data;
76 AVFrame *picture = data;
77 int orig_size = buf_size;
78 enum {NUV_UNCOMPRESSED = '0', NUV_RTJPEG = '1',
79 NUV_RTJPEG_IN_LZO = '2', NUV_LZO = '3',
80 NUV_BLACK = 'N', NUV_COPY_LAST = 'L'} comptype;
83 av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
88 avctx->release_buffer(avctx, &c->pic);
90 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
91 FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
92 if (avctx->get_buffer(avctx, &c->pic) < 0) {
93 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
97 // codec data (rtjpeg quant tables)
98 if (buf[0] == 'D' && buf[1] == 'R') {
100 // skip rest of the frameheader.
103 ret = get_quant(avctx, c, buf, buf_size);
106 rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
110 if (buf[0] != 'V' || buf_size < 12) {
111 av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
115 // skip rest of the frameheader.
119 c->pic.pict_type = FF_I_TYPE;
120 c->pic.key_frame = 1;
121 // decompress/copy/whatever data
123 case NUV_UNCOMPRESSED: {
124 int height = c->height;
125 if (buf_size < c->width * height * 3 / 2) {
126 av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
127 height = buf_size / c->width / 3 * 2;
129 copy_frame(&c->pic, buf, c->width, height);
133 rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
136 case NUV_RTJPEG_IN_LZO: {
137 int outlen = c->decomp_size, inlen = buf_size;
138 if (lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
139 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
140 rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, c->decomp_buf, c->decomp_size);
144 int outlen = c->decomp_size, inlen = buf_size;
145 if (lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
146 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
147 copy_frame(&c->pic, c->decomp_buf, c->width, c->height);
151 memset(c->pic.data[0], 0, c->width * c->height);
152 memset(c->pic.data[1], 128, c->width * c->height / 4);
153 memset(c->pic.data[2], 128, c->width * c->height / 4);
156 case NUV_COPY_LAST: {
157 c->pic.pict_type = FF_P_TYPE;
158 c->pic.key_frame = 0;
159 /* nothing more to do here */
163 av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
168 *data_size = sizeof(AVFrame);
172 static int decode_init(AVCodecContext *avctx) {
173 NuvContext *c = (NuvContext *)avctx->priv_data;
174 avctx->width = (avctx->width + 1) & ~1;
175 avctx->height = (avctx->height + 1) & ~1;
176 if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
179 avctx->has_b_frames = 0;
180 avctx->pix_fmt = PIX_FMT_YUV420P;
181 c->pic.data[0] = NULL;
182 c->width = avctx->width;
183 c->height = avctx->height;
184 c->decomp_size = c->height * c->width * 3 / 2;
185 c->decomp_buf = av_malloc(c->decomp_size + LZO_OUTPUT_PADDING);
186 if (!c->decomp_buf) {
187 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
190 dsputil_init(&c->dsp, avctx);
191 if (avctx->extradata_size)
192 get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
193 rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
197 static int decode_end(AVCodecContext *avctx) {
198 NuvContext *c = (NuvContext *)avctx->priv_data;
199 av_freep(&c->decomp_buf);
201 avctx->release_buffer(avctx, &c->pic);
205 AVCodec nuv_decoder = {