aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/nuv.c
blob: c2301be77b887fedcb22cb4ad4b2a7b9f1bb2613 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
/*
 * NuppelVideo decoder
 * Copyright (c) 2006 Reimar Doeffinger
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <stddef.h>
#include <limits.h>

#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/lzo.h"
#include "libavutil/imgutils.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "decode.h"
#include "jpegquanttables.h"
#include "rtjpeg.h"

typedef struct NuvContext {
    AVFrame *pic;
    int codec_frameheader;
    int quality;
    int width, height;
    unsigned int decomp_size;
    unsigned char *decomp_buf;
    uint32_t lq[64], cq[64];
    RTJpegContext rtj;
} NuvContext;

/**
 * @brief copy frame data from buffer to AVFrame, handling stride.
 * @param f destination AVFrame
 * @param src source buffer, does not use any line-stride
 * @param width width of the video frame
 * @param height height of the video frame
 */
static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
{
    uint8_t *src_data[4];
    int src_linesize[4];
    av_image_fill_arrays(src_data, src_linesize, src,
                         f->format, width, height, 1);
    av_image_copy2(f->data, f->linesize, src_data, src_linesize,
                   f->format, width, height);
}

/**
 * @brief extract quantization tables from codec data into our context
 */
static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
                     int size)
{
    int i;
    if (size < 2 * 64 * 4) {
        av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
        return AVERROR_INVALIDDATA;
    }
    for (i = 0; i < 64; i++, buf += 4)
        c->lq[i] = AV_RL32(buf);
    for (i = 0; i < 64; i++, buf += 4)
        c->cq[i] = AV_RL32(buf);
    return 0;
}

/**
 * @brief set quantization tables from a quality value
 */
static void get_quant_quality(NuvContext *c, int quality)
{
    int i;
    quality = FFMAX(quality, 1);
    for (i = 0; i < 64; i++) {
        c->lq[i] = (ff_mjpeg_std_luminance_quant_tbl[i] << 7) / quality;
        c->cq[i] = (ff_mjpeg_std_chrominance_quant_tbl[i] << 7) / quality;
    }
}

static int codec_reinit(AVCodecContext *avctx, int width, int height,
                        int quality)
{
    NuvContext *c = avctx->priv_data;
    int ret;

    width  = FFALIGN(width,  2);
    height = FFALIGN(height, 2);
    if (quality >= 0)
        get_quant_quality(c, quality);
    if (width != c->width || height != c->height) {
        // also reserve space for a possible additional header
        int64_t buf_size = height * (int64_t)width * 3 / 2
                     + FFMAX(AV_LZO_OUTPUT_PADDING, AV_INPUT_BUFFER_PADDING_SIZE)
                     + RTJPEG_HEADER_SIZE;
        if (buf_size > INT_MAX/8)
            return -1;
        if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
            return ret;
        c->width  = width;
        c->height = height;
        av_fast_malloc(&c->decomp_buf, &c->decomp_size,
                       buf_size);
        if (!c->decomp_buf) {
            av_log(avctx, AV_LOG_ERROR,
                   "Can't allocate decompression buffer.\n");
            return AVERROR(ENOMEM);
        }
        ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
        av_frame_unref(c->pic);
        return 1;
    } else if (quality != c->quality)
        ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);

    return 0;
}

static int decode_frame(AVCodecContext *avctx, AVFrame *picture,
                        int *got_frame, AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size       = avpkt->size;
    NuvContext *c      = avctx->priv_data;
    int orig_size      = buf_size;
    int keyframe, ret;
    int size_change = 0;
    int minsize = 0;
    int flags = 0;
    int result, init_frame = !avctx->frame_num;
    enum {
        NUV_UNCOMPRESSED  = '0',
        NUV_RTJPEG        = '1',
        NUV_RTJPEG_IN_LZO = '2',
        NUV_LZO           = '3',
        NUV_BLACK         = 'N',
        NUV_COPY_LAST     = 'L'
    } comptype;

    if (buf_size < 12) {
        av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
        return AVERROR_INVALIDDATA;
    }

    // codec data (rtjpeg quant tables)
    if (buf[0] == 'D' && buf[1] == 'R') {
        int ret;
        // Skip the rest of the frame header.
        buf       = &buf[12];
        buf_size -= 12;
        ret       = get_quant(avctx, c, buf, buf_size);
        if (ret < 0)
            return ret;
        ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
        return orig_size;
    }

    if (buf_size < 12 || buf[0] != 'V') {
        av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
        return AVERROR_INVALIDDATA;
    }
    comptype = buf[1];
    switch (comptype) {
    case NUV_RTJPEG_IN_LZO:
    case NUV_RTJPEG:
        keyframe = !buf[2];
        if (c->width < 16 || c->height < 16) {
            return AVERROR_INVALIDDATA;
        }
        break;
    case NUV_COPY_LAST:
        flags |= FF_REGET_BUFFER_FLAG_READONLY;
        keyframe = 0;
        break;
    default:
        keyframe = 1;
        break;
    }
    switch (comptype) {
    case NUV_UNCOMPRESSED:
        minsize = c->width * c->height * 3 / 2;
        break;
    case NUV_RTJPEG:
        minsize = c->width/16 * (c->height/16) * 6;
        break;
    case NUV_BLACK:
    case NUV_COPY_LAST:
    case NUV_LZO:
    case NUV_RTJPEG_IN_LZO:
        break;
    default:
        av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
        return AVERROR_INVALIDDATA;
    }
    if (buf_size < minsize / 4)
        return AVERROR_INVALIDDATA;
retry:
    // Skip the rest of the frame header.
    buf       = &buf[12];
    buf_size -= 12;
    if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
        int outlen = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING);
        int inlen  = buf_size;
        if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
            av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
            return AVERROR_INVALIDDATA;
        }
        buf      = c->decomp_buf;
        buf_size = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING) - outlen;
        memset(c->decomp_buf + buf_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
    }
    if (c->codec_frameheader) {
        int w, h, q;
        if (buf_size < RTJPEG_HEADER_SIZE) {
            av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n");
            return AVERROR_INVALIDDATA;
        }
        // There seem to exist two variants of this header: one starts with 'V'
        // and 5 bytes unknown, the other matches current MythTV and is 4 bytes size,
        // 1 byte header size (== 12), 1 byte version (== 0)
        if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) {
            av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\n");
            return AVERROR_INVALIDDATA;
        }
        w = AV_RL16(&buf[6]);
        h = AV_RL16(&buf[8]);
        q = buf[10];
        if ((result = codec_reinit(avctx, w, h, q)) < 0)
            return result;
        if (result) {
            buf = avpkt->data;
            buf_size = avpkt->size;
            size_change = 1;
            goto retry;
        }
        buf       = &buf[RTJPEG_HEADER_SIZE];
        buf_size -= RTJPEG_HEADER_SIZE;
    }

    if (size_change || keyframe) {
        av_frame_unref(c->pic);
        init_frame = 1;
    }

    if ((result = ff_reget_buffer(avctx, c->pic, flags)) < 0)
        return result;
    if (init_frame) {
        memset(c->pic->data[0], 0,    avctx->height * c->pic->linesize[0]);
        memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2);
        memset(c->pic->data[2], 0x80, avctx->height * c->pic->linesize[2] / 2);
    }

    c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
    if (keyframe)
        c->pic->flags |= AV_FRAME_FLAG_KEY;
    else
        c->pic->flags &= ~AV_FRAME_FLAG_KEY;
    // decompress/copy/whatever data
    switch (comptype) {
    case NUV_LZO:
    case NUV_UNCOMPRESSED: {
        int height = c->height;
        if (buf_size < c->width * height * 3 / 2) {
            av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
            height = buf_size / c->width / 3 * 2;
        }
        if(height > 0)
            copy_frame(c->pic, buf, c->width, height);
        break;
    }
    case NUV_RTJPEG_IN_LZO:
    case NUV_RTJPEG:
        ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
        if (ret < 0)
            return ret;
        break;
    case NUV_BLACK:
        memset(c->pic->data[0], 0, c->width * c->height);
        memset(c->pic->data[1], 128, c->width * c->height / 4);
        memset(c->pic->data[2], 128, c->width * c->height / 4);
        break;
    case NUV_COPY_LAST:
        /* nothing more to do here */
        break;
    }

    if ((result = av_frame_ref(picture, c->pic)) < 0)
        return result;

    *got_frame = 1;
    return orig_size;
}

static av_cold int decode_init(AVCodecContext *avctx)
{
    NuvContext *c  = avctx->priv_data;
    int ret;

    c->pic = av_frame_alloc();
    if (!c->pic)
        return AVERROR(ENOMEM);

    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
    c->decomp_buf  = NULL;
    c->quality     = -1;
    c->width       = 0;
    c->height      = 0;

    c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');

    if (avctx->extradata_size)
        get_quant(avctx, c, avctx->extradata, avctx->extradata_size);

    ff_rtjpeg_init(&c->rtj, avctx);

    if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
        return ret;

    return 0;
}

static av_cold int decode_end(AVCodecContext *avctx)
{
    NuvContext *c = avctx->priv_data;

    av_freep(&c->decomp_buf);
    av_frame_free(&c->pic);

    return 0;
}

const FFCodec ff_nuv_decoder = {
    .p.name         = "nuv",
    CODEC_LONG_NAME("NuppelVideo/RTJPEG"),
    .p.type         = AVMEDIA_TYPE_VIDEO,
    .p.id           = AV_CODEC_ID_NUV,
    .priv_data_size = sizeof(NuvContext),
    .init           = decode_init,
    .close          = decode_end,
    FF_CODEC_DECODE_CB(decode_frame),
    .p.capabilities = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
};