GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/nuv.c Lines: 120 183 65.6 %
Date: 2019-11-18 18:00:01 Branches: 53 93 57.0 %

Line Branch Exec Source
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
22
#include <stdio.h>
23
#include <stdlib.h>
24
#include <limits.h>
25
26
#include "libavutil/bswap.h"
27
#include "libavutil/common.h"
28
#include "libavutil/intreadwrite.h"
29
#include "libavutil/lzo.h"
30
#include "libavutil/imgutils.h"
31
#include "avcodec.h"
32
#include "idctdsp.h"
33
#include "internal.h"
34
#include "rtjpeg.h"
35
36
typedef struct NuvContext {
37
    AVFrame *pic;
38
    int codec_frameheader;
39
    int quality;
40
    int width, height;
41
    unsigned int decomp_size;
42
    unsigned char *decomp_buf;
43
    uint32_t lq[64], cq[64];
44
    RTJpegContext rtj;
45
} NuvContext;
46
47
static const uint8_t fallback_lquant[] = {
48
    16,  11,  10,  16,  24,  40,  51,  61,
49
    12,  12,  14,  19,  26,  58,  60,  55,
50
    14,  13,  16,  24,  40,  57,  69,  56,
51
    14,  17,  22,  29,  51,  87,  80,  62,
52
    18,  22,  37,  56,  68, 109, 103,  77,
53
    24,  35,  55,  64,  81, 104, 113,  92,
54
    49,  64,  78,  87, 103, 121, 120, 101,
55
    72,  92,  95,  98, 112, 100, 103,  99
56
};
57
58
static const uint8_t fallback_cquant[] = {
59
    17, 18, 24, 47, 99, 99, 99, 99,
60
    18, 21, 26, 66, 99, 99, 99, 99,
61
    24, 26, 56, 99, 99, 99, 99, 99,
62
    47, 66, 99, 99, 99, 99, 99, 99,
63
    99, 99, 99, 99, 99, 99, 99, 99,
64
    99, 99, 99, 99, 99, 99, 99, 99,
65
    99, 99, 99, 99, 99, 99, 99, 99,
66
    99, 99, 99, 99, 99, 99, 99, 99
67
};
68
69
/**
70
 * @brief copy frame data from buffer to AVFrame, handling stride.
71
 * @param f destination AVFrame
72
 * @param src source buffer, does not use any line-stride
73
 * @param width width of the video frame
74
 * @param height height of the video frame
75
 */
76
static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
77
{
78
    uint8_t *src_data[4];
79
    int src_linesize[4];
80
    av_image_fill_arrays(src_data, src_linesize, src,
81
                         f->format, width, height, 1);
82
    av_image_copy(f->data, f->linesize, (const uint8_t **)src_data, src_linesize,
83
                  f->format, width, height);
84
}
85
86
/**
87
 * @brief extract quantization tables from codec data into our context
88
 */
89
4
static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
90
                     int size)
91
{
92
    int i;
93
4
    if (size < 2 * 64 * 4) {
94
        av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
95
        return AVERROR_INVALIDDATA;
96
    }
97
260
    for (i = 0; i < 64; i++, buf += 4)
98
256
        c->lq[i] = AV_RL32(buf);
99
260
    for (i = 0; i < 64; i++, buf += 4)
100
256
        c->cq[i] = AV_RL32(buf);
101
4
    return 0;
102
}
103
104
/**
105
 * @brief set quantization tables from a quality value
106
 */
107
50
static void get_quant_quality(NuvContext *c, int quality)
108
{
109
    int i;
110
50
    quality = FFMAX(quality, 1);
111
3250
    for (i = 0; i < 64; i++) {
112
3200
        c->lq[i] = (fallback_lquant[i] << 7) / quality;
113
3200
        c->cq[i] = (fallback_cquant[i] << 7) / quality;
114
    }
115
50
}
116
117
54
static int codec_reinit(AVCodecContext *avctx, int width, int height,
118
                        int quality)
119
{
120
54
    NuvContext *c = avctx->priv_data;
121
    int ret;
122
123
54
    width  = FFALIGN(width,  2);
124
54
    height = FFALIGN(height, 2);
125
54
    if (quality >= 0)
126
50
        get_quant_quality(c, quality);
127

54
    if (width != c->width || height != c->height) {
128
        // also reserve space for a possible additional header
129
4
        int buf_size = height * width * 3 / 2
130
                     + FFMAX(AV_LZO_OUTPUT_PADDING, AV_INPUT_BUFFER_PADDING_SIZE)
131
                     + RTJPEG_HEADER_SIZE;
132
4
        if (buf_size > INT_MAX/8)
133
            return -1;
134
4
        if ((ret = av_image_check_size(height, width, 0, avctx)) < 0)
135
            return ret;
136
4
        avctx->width  = c->width  = width;
137
4
        avctx->height = c->height = height;
138
4
        av_fast_malloc(&c->decomp_buf, &c->decomp_size,
139
                       buf_size);
140
4
        if (!c->decomp_buf) {
141
            av_log(avctx, AV_LOG_ERROR,
142
                   "Can't allocate decompression buffer.\n");
143
            return AVERROR(ENOMEM);
144
        }
145
4
        ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
146
4
        av_frame_unref(c->pic);
147
4
        return 1;
148
50
    } else if (quality != c->quality)
149
50
        ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
150
151
50
    return 0;
152
}
153
154
59
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
155
                        AVPacket *avpkt)
156
{
157
59
    const uint8_t *buf = avpkt->data;
158
59
    int buf_size       = avpkt->size;
159
59
    NuvContext *c      = avctx->priv_data;
160
59
    AVFrame *picture   = data;
161
59
    int orig_size      = buf_size;
162
    int keyframe, ret;
163
59
    int size_change = 0;
164
59
    int minsize = 0;
165
59
    int flags = 0;
166
59
    int result, init_frame = !avctx->frame_number;
167
    enum {
168
        NUV_UNCOMPRESSED  = '0',
169
        NUV_RTJPEG        = '1',
170
        NUV_RTJPEG_IN_LZO = '2',
171
        NUV_LZO           = '3',
172
        NUV_BLACK         = 'N',
173
        NUV_COPY_LAST     = 'L'
174
    } comptype;
175
176
59
    if (buf_size < 12) {
177
        av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
178
        return AVERROR_INVALIDDATA;
179
    }
180
181
    // codec data (rtjpeg quant tables)
182

59
    if (buf[0] == 'D' && buf[1] == 'R') {
183
        int ret;
184
        // Skip the rest of the frame header.
185
        buf       = &buf[12];
186
        buf_size -= 12;
187
        ret       = get_quant(avctx, c, buf, buf_size);
188
        if (ret < 0)
189
            return ret;
190
        ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
191
        return orig_size;
192
    }
193
194

59
    if (buf_size < 12 || buf[0] != 'V') {
195
        av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
196
        return AVERROR_INVALIDDATA;
197
    }
198
59
    comptype = buf[1];
199
59
    switch (comptype) {
200
58
    case NUV_RTJPEG_IN_LZO:
201
    case NUV_RTJPEG:
202
58
        keyframe = !buf[2];
203

58
        if (c->width < 16 || c->height < 16) {
204
            return AVERROR_INVALIDDATA;
205
        }
206
58
        break;
207
1
    case NUV_COPY_LAST:
208
1
        flags |= FF_REGET_BUFFER_FLAG_READONLY;
209
1
        keyframe = 0;
210
1
        break;
211
    default:
212
        keyframe = 1;
213
        break;
214
    }
215
59
    switch (comptype) {
216
    case NUV_UNCOMPRESSED:
217
        minsize = c->width * c->height * 3 / 2;
218
        break;
219
    case NUV_RTJPEG:
220
        minsize = c->width/16 * (c->height/16) * 6;
221
        break;
222
    }
223
59
    if (buf_size < minsize / 4)
224
        return AVERROR_INVALIDDATA;
225
59
retry:
226
    // Skip the rest of the frame header.
227
59
    buf       = &buf[12];
228
59
    buf_size -= 12;
229

59
    if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
230
58
        int outlen = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING);
231
58
        int inlen  = buf_size;
232
58
        if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
233
1
            av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
234
1
            return AVERROR_INVALIDDATA;
235
        }
236
57
        buf      = c->decomp_buf;
237
57
        buf_size = c->decomp_size - FFMAX(AV_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING) - outlen;
238
57
        memset(c->decomp_buf + buf_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
239
    }
240
58
    if (c->codec_frameheader) {
241
        int w, h, q;
242
50
        if (buf_size < RTJPEG_HEADER_SIZE) {
243
            av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n");
244
            return AVERROR_INVALIDDATA;
245
        }
246
        // There seem to exist two variants of this header: one starts with 'V'
247
        // and 5 bytes unknown, the other matches current MythTV and is 4 bytes size,
248
        // 1 byte header size (== 12), 1 byte version (== 0)
249

50
        if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) {
250
            av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\n");
251
            return AVERROR_INVALIDDATA;
252
        }
253
50
        w = AV_RL16(&buf[6]);
254
50
        h = AV_RL16(&buf[8]);
255
50
        q = buf[10];
256
50
        if ((result = codec_reinit(avctx, w, h, q)) < 0)
257
            return result;
258
50
        if (result) {
259
            buf = avpkt->data;
260
            buf_size = avpkt->size;
261
            size_change = 1;
262
            goto retry;
263
        }
264
50
        buf       = &buf[RTJPEG_HEADER_SIZE];
265
50
        buf_size -= RTJPEG_HEADER_SIZE;
266
    }
267
268

58
    if (size_change || keyframe) {
269
3
        av_frame_unref(c->pic);
270
3
        init_frame = 1;
271
    }
272
273
58
    if ((result = ff_reget_buffer(avctx, c->pic, flags)) < 0)
274
        return result;
275
58
    if (init_frame) {
276
3
        memset(c->pic->data[0], 0,    avctx->height * c->pic->linesize[0]);
277
3
        memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2);
278
3
        memset(c->pic->data[2], 0x80, avctx->height * c->pic->linesize[2] / 2);
279
    }
280
281
58
    c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
282
58
    c->pic->key_frame = keyframe;
283
    // decompress/copy/whatever data
284

58
    switch (comptype) {
285
    case NUV_LZO:
286
    case NUV_UNCOMPRESSED: {
287
        int height = c->height;
288
        if (buf_size < c->width * height * 3 / 2) {
289
            av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
290
            height = buf_size / c->width / 3 * 2;
291
        }
292
        if(height > 0)
293
            copy_frame(c->pic, buf, c->width, height);
294
        break;
295
    }
296
57
    case NUV_RTJPEG_IN_LZO:
297
    case NUV_RTJPEG:
298
57
        ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
299
57
        if (ret < 0)
300
            return ret;
301
57
        break;
302
    case NUV_BLACK:
303
        memset(c->pic->data[0], 0, c->width * c->height);
304
        memset(c->pic->data[1], 128, c->width * c->height / 4);
305
        memset(c->pic->data[2], 128, c->width * c->height / 4);
306
        break;
307
1
    case NUV_COPY_LAST:
308
        /* nothing more to do here */
309
1
        break;
310
    default:
311
        av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
312
        return AVERROR_INVALIDDATA;
313
    }
314
315
58
    if ((result = av_frame_ref(picture, c->pic)) < 0)
316
        return result;
317
318
58
    *got_frame = 1;
319
58
    return orig_size;
320
}
321
322
4
static av_cold int decode_init(AVCodecContext *avctx)
323
{
324
4
    NuvContext *c  = avctx->priv_data;
325
    int ret;
326
327
4
    c->pic = av_frame_alloc();
328
4
    if (!c->pic)
329
        return AVERROR(ENOMEM);
330
331
4
    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
332
4
    c->decomp_buf  = NULL;
333
4
    c->quality     = -1;
334
4
    c->width       = 0;
335
4
    c->height      = 0;
336
337
4
    c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
338
339
4
    if (avctx->extradata_size)
340
4
        get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
341
342
4
    ff_rtjpeg_init(&c->rtj, avctx);
343
344
4
    if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
345
        return ret;
346
347
4
    return 0;
348
}
349
350
4
static av_cold int decode_end(AVCodecContext *avctx)
351
{
352
4
    NuvContext *c = avctx->priv_data;
353
354
4
    av_freep(&c->decomp_buf);
355
4
    av_frame_free(&c->pic);
356
357
4
    return 0;
358
}
359
360
AVCodec ff_nuv_decoder = {
361
    .name           = "nuv",
362
    .long_name      = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
363
    .type           = AVMEDIA_TYPE_VIDEO,
364
    .id             = AV_CODEC_ID_NUV,
365
    .priv_data_size = sizeof(NuvContext),
366
    .init           = decode_init,
367
    .close          = decode_end,
368
    .decode         = decode_frame,
369
    .capabilities   = AV_CODEC_CAP_DR1,
370
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
371
};