1/*
2 * NuppelVideo decoder
3 * Copyright (c) 2006 Reimar Doeffinger
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21#include <stdio.h>
22#include <stdlib.h>
23
24#include "libavutil/bswap.h"
25#include "libavutil/lzo.h"
26#include "avcodec.h"
27#include "dsputil.h"
28#include "rtjpeg.h"
29
30typedef struct {
31    AVFrame pic;
32    int codec_frameheader;
33    int quality;
34    int width, height;
35    unsigned int decomp_size;
36    unsigned char* decomp_buf;
37    uint32_t lq[64], cq[64];
38    RTJpegContext rtj;
39    DSPContext dsp;
40} NuvContext;
41
42static const uint8_t fallback_lquant[] = {
43    16,  11,  10,  16,  24,  40,  51,  61,
44    12,  12,  14,  19,  26,  58,  60,  55,
45    14,  13,  16,  24,  40,  57,  69,  56,
46    14,  17,  22,  29,  51,  87,  80,  62,
47    18,  22,  37,  56,  68, 109, 103,  77,
48    24,  35,  55,  64,  81, 104, 113,  92,
49    49,  64,  78,  87, 103, 121, 120, 101,
50    72,  92,  95,  98, 112, 100, 103,  99
51};
52
53static const uint8_t fallback_cquant[] = {
54    17, 18, 24, 47, 99, 99, 99, 99,
55    18, 21, 26, 66, 99, 99, 99, 99,
56    24, 26, 56, 99, 99, 99, 99, 99,
57    47, 66, 99, 99, 99, 99, 99, 99,
58    99, 99, 99, 99, 99, 99, 99, 99,
59    99, 99, 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};
63
64/**
65 * \brief copy frame data from buffer to AVFrame, handling stride.
66 * \param f destination AVFrame
67 * \param src source buffer, does not use any line-stride
68 * \param width width of the video frame
69 * \param height height of the video frame
70 */
71static void copy_frame(AVFrame *f, const uint8_t *src,
72                       int width, int height) {
73    AVPicture pic;
74    avpicture_fill(&pic, src, PIX_FMT_YUV420P, width, height);
75    av_picture_copy((AVPicture *)f, &pic, PIX_FMT_YUV420P, width, height);
76}
77
78/**
79 * \brief extract quantization tables from codec data into our context
80 */
81static int get_quant(AVCodecContext *avctx, NuvContext *c,
82                     const uint8_t *buf, int size) {
83    int i;
84    if (size < 2 * 64 * 4) {
85        av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
86        return -1;
87    }
88    for (i = 0; i < 64; i++, buf += 4)
89        c->lq[i] = AV_RL32(buf);
90    for (i = 0; i < 64; i++, buf += 4)
91        c->cq[i] = AV_RL32(buf);
92    return 0;
93}
94
95/**
96 * \brief set quantization tables from a quality value
97 */
98static void get_quant_quality(NuvContext *c, int quality) {
99    int i;
100    quality = FFMAX(quality, 1);
101    for (i = 0; i < 64; i++) {
102        c->lq[i] = (fallback_lquant[i] << 7) / quality;
103        c->cq[i] = (fallback_cquant[i] << 7) / quality;
104    }
105}
106
107static int codec_reinit(AVCodecContext *avctx, int width, int height, int quality) {
108    NuvContext *c = avctx->priv_data;
109    width = (width + 1) & ~1;
110    height = (height + 1) & ~1;
111    if (quality >= 0)
112        get_quant_quality(c, quality);
113    if (width != c->width || height != c->height) {
114        if (avcodec_check_dimensions(avctx, height, width) < 0)
115            return 0;
116        avctx->width = c->width = width;
117        avctx->height = c->height = height;
118        c->decomp_size = c->height * c->width * 3 / 2;
119        c->decomp_buf = av_realloc(c->decomp_buf, c->decomp_size + AV_LZO_OUTPUT_PADDING);
120        if (!c->decomp_buf) {
121            av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
122            return 0;
123        }
124        rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
125    } else if (quality != c->quality)
126        rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
127    return 1;
128}
129
130static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
131                        const uint8_t *buf, int buf_size) {
132    NuvContext *c = avctx->priv_data;
133    AVFrame *picture = data;
134    int orig_size = buf_size;
135    int keyframe;
136    int result;
137    enum {NUV_UNCOMPRESSED = '0', NUV_RTJPEG = '1',
138          NUV_RTJPEG_IN_LZO = '2', NUV_LZO = '3',
139          NUV_BLACK = 'N', NUV_COPY_LAST = 'L'} comptype;
140
141    if (buf_size < 12) {
142        av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
143        return -1;
144    }
145
146    // codec data (rtjpeg quant tables)
147    if (buf[0] == 'D' && buf[1] == 'R') {
148        int ret;
149        // skip rest of the frameheader.
150        buf = &buf[12];
151        buf_size -= 12;
152        ret = get_quant(avctx, c, buf, buf_size);
153        if (ret < 0)
154            return ret;
155        rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
156        return orig_size;
157    }
158
159    if (buf[0] != 'V' || buf_size < 12) {
160        av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
161        return -1;
162    }
163    comptype = buf[1];
164    switch (comptype) {
165        case NUV_RTJPEG_IN_LZO:
166        case NUV_RTJPEG:
167            keyframe = !buf[2]; break;
168        case NUV_COPY_LAST:
169            keyframe = 0; break;
170        default:
171            keyframe = 1; break;
172    }
173    // skip rest of the frameheader.
174    buf = &buf[12];
175    buf_size -= 12;
176    if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
177        int outlen = c->decomp_size, inlen = buf_size;
178        if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
179            av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
180        buf = c->decomp_buf;
181        buf_size = c->decomp_size;
182    }
183    if (c->codec_frameheader) {
184        int w, h, q;
185        if (buf_size < 12) {
186            av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame\n");
187            return -1;
188        }
189        w = AV_RL16(&buf[6]);
190        h = AV_RL16(&buf[8]);
191        q = buf[10];
192        if (!codec_reinit(avctx, w, h, q))
193            return -1;
194        buf = &buf[12];
195        buf_size -= 12;
196    }
197
198    if (keyframe && c->pic.data[0])
199        avctx->release_buffer(avctx, &c->pic);
200    c->pic.reference = 1;
201    c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
202                          FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
203    result = keyframe ? avctx->get_buffer(avctx, &c->pic) : avctx->reget_buffer(avctx, &c->pic);
204    if (result < 0) {
205        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
206        return -1;
207    }
208
209    c->pic.pict_type = keyframe ? FF_I_TYPE : FF_P_TYPE;
210    c->pic.key_frame = keyframe;
211    // decompress/copy/whatever data
212    switch (comptype) {
213        case NUV_LZO:
214        case NUV_UNCOMPRESSED: {
215            int height = c->height;
216            if (buf_size < c->width * height * 3 / 2) {
217                av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
218                height = buf_size / c->width / 3 * 2;
219            }
220            copy_frame(&c->pic, buf, c->width, height);
221            break;
222        }
223        case NUV_RTJPEG_IN_LZO:
224        case NUV_RTJPEG: {
225            rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
226            break;
227        }
228        case NUV_BLACK: {
229            memset(c->pic.data[0], 0, c->width * c->height);
230            memset(c->pic.data[1], 128, c->width * c->height / 4);
231            memset(c->pic.data[2], 128, c->width * c->height / 4);
232            break;
233        }
234        case NUV_COPY_LAST: {
235            /* nothing more to do here */
236            break;
237        }
238        default:
239            av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
240            return -1;
241    }
242
243    *picture = c->pic;
244    *data_size = sizeof(AVFrame);
245    return orig_size;
246}
247
248static av_cold int decode_init(AVCodecContext *avctx) {
249    NuvContext *c = avctx->priv_data;
250    avctx->pix_fmt = PIX_FMT_YUV420P;
251    c->pic.data[0] = NULL;
252    c->decomp_buf = NULL;
253    c->quality = -1;
254    c->width = 0;
255    c->height = 0;
256    c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
257    if (avctx->extradata_size)
258        get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
259    dsputil_init(&c->dsp, avctx);
260    if (!codec_reinit(avctx, avctx->width, avctx->height, -1))
261        return 1;
262    return 0;
263}
264
265static av_cold int decode_end(AVCodecContext *avctx) {
266    NuvContext *c = avctx->priv_data;
267    av_freep(&c->decomp_buf);
268    if (c->pic.data[0])
269        avctx->release_buffer(avctx, &c->pic);
270    return 0;
271}
272
273AVCodec nuv_decoder = {
274    "nuv",
275    CODEC_TYPE_VIDEO,
276    CODEC_ID_NUV,
277    sizeof(NuvContext),
278    decode_init,
279    NULL,
280    decode_end,
281    decode_frame,
282    CODEC_CAP_DR1,
283    .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
284};
285
286