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
34 unsigned int decomp_size;
35 unsigned char* decomp_buf;
36 uint32_t lq[64], cq[64];
42 * \brief copy frame data from buffer to AVFrame, handling stride.
43 * \param f destination AVFrame
44 * \param src source buffer, does not use any line-stride
45 * \param width width of the video frame
46 * \param height height of the video frame
48 static void copy_frame(AVFrame *f, uint8_t *src,
49 int width, int height) {
51 avpicture_fill(&pic, src, PIX_FMT_YUV420P, width, height);
52 av_picture_copy((AVPicture *)f, &pic, PIX_FMT_YUV420P, width, height);
56 * \brief extract quantization tables from codec data into our context
58 static int get_quant(AVCodecContext *avctx, NuvContext *c,
59 uint8_t *buf, int size) {
61 if (size < 2 * 64 * 4) {
62 av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
65 for (i = 0; i < 64; i++, buf += 4)
66 c->lq[i] = AV_RL32(buf);
67 for (i = 0; i < 64; i++, buf += 4)
68 c->cq[i] = AV_RL32(buf);
72 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
73 uint8_t *buf, int buf_size) {
74 NuvContext *c = avctx->priv_data;
75 AVFrame *picture = data;
76 int orig_size = buf_size;
77 enum {NUV_UNCOMPRESSED = '0', NUV_RTJPEG = '1',
78 NUV_RTJPEG_IN_LZO = '2', NUV_LZO = '3',
79 NUV_BLACK = 'N', NUV_COPY_LAST = 'L'} comptype;
82 av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
87 avctx->release_buffer(avctx, &c->pic);
89 c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
90 FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
91 if (avctx->get_buffer(avctx, &c->pic) < 0) {
92 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
96 // codec data (rtjpeg quant tables)
97 if (buf[0] == 'D' && buf[1] == 'R') {
99 // skip rest of the frameheader.
102 ret = get_quant(avctx, c, buf, buf_size);
105 rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
109 if (buf[0] != 'V' || buf_size < 12) {
110 av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
114 // skip rest of the frameheader.
118 c->pic.pict_type = FF_I_TYPE;
119 c->pic.key_frame = 1;
120 // decompress/copy/whatever data
122 case NUV_UNCOMPRESSED: {
123 int height = c->height;
124 if (buf_size < c->width * height * 3 / 2) {
125 av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
126 height = buf_size / c->width / 3 * 2;
128 copy_frame(&c->pic, buf, c->width, height);
132 rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
135 case NUV_RTJPEG_IN_LZO: {
136 int outlen = c->decomp_size, inlen = buf_size;
137 if (lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
138 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
139 rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, c->decomp_buf, c->decomp_size);
143 int outlen = c->decomp_size, inlen = buf_size;
144 if (lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
145 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
146 copy_frame(&c->pic, c->decomp_buf, c->width, c->height);
150 memset(c->pic.data[0], 0, c->width * c->height);
151 memset(c->pic.data[1], 128, c->width * c->height / 4);
152 memset(c->pic.data[2], 128, c->width * c->height / 4);
155 case NUV_COPY_LAST: {
156 c->pic.pict_type = FF_P_TYPE;
157 c->pic.key_frame = 0;
158 /* nothing more to do here */
162 av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
167 *data_size = sizeof(AVFrame);
171 static int decode_init(AVCodecContext *avctx) {
172 NuvContext *c = avctx->priv_data;
173 avctx->width = (avctx->width + 1) & ~1;
174 avctx->height = (avctx->height + 1) & ~1;
175 if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
178 avctx->pix_fmt = PIX_FMT_YUV420P;
179 c->pic.data[0] = NULL;
180 c->width = avctx->width;
181 c->height = avctx->height;
182 c->decomp_size = c->height * c->width * 3 / 2;
183 c->decomp_buf = av_malloc(c->decomp_size + LZO_OUTPUT_PADDING);
184 if (!c->decomp_buf) {
185 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
188 dsputil_init(&c->dsp, avctx);
189 if (avctx->extradata_size)
190 get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
191 rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
195 static int decode_end(AVCodecContext *avctx) {
196 NuvContext *c = avctx->priv_data;
197 av_freep(&c->decomp_buf);
199 avctx->release_buffer(avctx, &c->pic);
203 AVCodec nuv_decoder = {