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                        AVPacket *avpkt) {
132    const uint8_t *buf = avpkt->data;
133    int buf_size = avpkt->size;
134    NuvContext *c = avctx->priv_data;
135    AVFrame *picture = data;
136    int orig_size = buf_size;
137    int keyframe;
138    int result;
139    enum {NUV_UNCOMPRESSED = '0', NUV_RTJPEG = '1',
140          NUV_RTJPEG_IN_LZO = '2', NUV_LZO = '3',
141          NUV_BLACK = 'N', NUV_COPY_LAST = 'L'} comptype;
142
143    if (buf_size < 12) {
144        av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
145        return -1;
146    }
147
148    // codec data (rtjpeg quant tables)
149    if (buf[0] == 'D' && buf[1] == 'R') {
150        int ret;
151        // skip rest of the frameheader.
152        buf = &buf[12];
153        buf_size -= 12;
154        ret = get_quant(avctx, c, buf, buf_size);
155        if (ret < 0)
156            return ret;
157        rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
158        return orig_size;
159    }
160
161    if (buf[0] != 'V' || buf_size < 12) {
162        av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
163        return -1;
164    }
165    comptype = buf[1];
166    switch (comptype) {
167        case NUV_RTJPEG_IN_LZO:
168        case NUV_RTJPEG:
169            keyframe = !buf[2]; break;
170        case NUV_COPY_LAST:
171            keyframe = 0; break;
172        default:
173            keyframe = 1; break;
174    }
175    // skip rest of the frameheader.
176    buf = &buf[12];
177    buf_size -= 12;
178    if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
179        int outlen = c->decomp_size, inlen = buf_size;
180        if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
181            av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
182        buf = c->decomp_buf;
183        buf_size = c->decomp_size;
184    }
185    if (c->codec_frameheader) {
186        int w, h, q;
187        if (buf_size < 12) {
188            av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame\n");
189            return -1;
190        }
191        w = AV_RL16(&buf[6]);
192        h = AV_RL16(&buf[8]);
193        q = buf[10];
194        if (!codec_reinit(avctx, w, h, q))
195            return -1;
196        buf = &buf[12];
197        buf_size -= 12;
198    }
199
200    if (keyframe && c->pic.data[0])
201        avctx->release_buffer(avctx, &c->pic);
202    c->pic.reference = 3;
203    c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
204                          FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
205    result = avctx->reget_buffer(avctx, &c->pic);
206    if (result < 0) {
207        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
208        return -1;
209    }
210
211    c->pic.pict_type = keyframe ? FF_I_TYPE : FF_P_TYPE;
212    c->pic.key_frame = keyframe;
213    // decompress/copy/whatever data
214    switch (comptype) {
215        case NUV_LZO:
216        case NUV_UNCOMPRESSED: {
217            int height = c->height;
218            if (buf_size < c->width * height * 3 / 2) {
219                av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
220                height = buf_size / c->width / 3 * 2;
221            }
222            copy_frame(&c->pic, buf, c->width, height);
223            break;
224        }
225        case NUV_RTJPEG_IN_LZO:
226        case NUV_RTJPEG: {
227            rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
228            break;
229        }
230        case NUV_BLACK: {
231            memset(c->pic.data[0], 0, c->width * c->height);
232            memset(c->pic.data[1], 128, c->width * c->height / 4);
233            memset(c->pic.data[2], 128, c->width * c->height / 4);
234            break;
235        }
236        case NUV_COPY_LAST: {
237            /* nothing more to do here */
238            break;
239        }
240        default:
241            av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
242            return -1;
243    }
244
245    *picture = c->pic;
246    *data_size = sizeof(AVFrame);
247    return orig_size;
248}
249
250static av_cold int decode_init(AVCodecContext *avctx) {
251    NuvContext *c = avctx->priv_data;
252    avctx->pix_fmt = PIX_FMT_YUV420P;
253    c->pic.data[0] = NULL;
254    c->decomp_buf = NULL;
255    c->quality = -1;
256    c->width = 0;
257    c->height = 0;
258    c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
259    if (avctx->extradata_size)
260        get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
261    dsputil_init(&c->dsp, avctx);
262    if (!codec_reinit(avctx, avctx->width, avctx->height, -1))
263        return 1;
264    return 0;
265}
266
267static av_cold int decode_end(AVCodecContext *avctx) {
268    NuvContext *c = avctx->priv_data;
269    av_freep(&c->decomp_buf);
270    if (c->pic.data[0])
271        avctx->release_buffer(avctx, &c->pic);
272    return 0;
273}
274
275AVCodec nuv_decoder = {
276    "nuv",
277    AVMEDIA_TYPE_VIDEO,
278    CODEC_ID_NUV,
279    sizeof(NuvContext),
280    decode_init,
281    NULL,
282    decode_end,
283    decode_frame,
284    CODEC_CAP_DR1,
285    .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
286};
287
288