nuv.c 10.7 KB
Newer Older
1 2 3 4
/*
 * NuppelVideo decoder
 * Copyright (c) 2006 Reimar Doeffinger
 *
5 6 7
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
8 9
 * modify it under the terms of the GNU Lesser General Public
 * 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 14 15 16 17
 * 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
18
 * License along with FFmpeg; if not, write to the Free Software
19 20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
21

22 23
#include <stdio.h>
#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 "internal.h"
33 34 35
#include "rtjpeg.h"

typedef struct {
36
    AVFrame *pic;
37
    int codec_frameheader;
38
    int quality;
39 40
    int width, height;
    unsigned int decomp_size;
41
    unsigned char *decomp_buf;
42 43 44 45
    uint32_t lq[64], cq[64];
    RTJpegContext rtj;
} NuvContext;

46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67
static const uint8_t fallback_lquant[] = {
    16,  11,  10,  16,  24,  40,  51,  61,
    12,  12,  14,  19,  26,  58,  60,  55,
    14,  13,  16,  24,  40,  57,  69,  56,
    14,  17,  22,  29,  51,  87,  80,  62,
    18,  22,  37,  56,  68, 109, 103,  77,
    24,  35,  55,  64,  81, 104, 113,  92,
    49,  64,  78,  87, 103, 121, 120, 101,
    72,  92,  95,  98, 112, 100, 103,  99
};

static const uint8_t fallback_cquant[] = {
    17, 18, 24, 47, 99, 99, 99, 99,
    18, 21, 26, 66, 99, 99, 99, 99,
    24, 26, 56, 99, 99, 99, 99, 99,
    47, 66, 99, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99,
    99, 99, 99, 99, 99, 99, 99, 99
};

68
/**
69 70 71 72 73
 * @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
74
 */
75 76
static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
{
77
    AVPicture pic;
78 79
    avpicture_fill(&pic, src, AV_PIX_FMT_YUV420P, width, height);
    av_picture_copy((AVPicture *)f, &pic, AV_PIX_FMT_YUV420P, width, height);
80 81 82
}

/**
83
 * @brief extract quantization tables from codec data into our context
84
 */
85 86 87
static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
                     int size)
{
88 89 90
    int i;
    if (size < 2 * 64 * 4) {
        av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
91
        return AVERROR_INVALIDDATA;
92 93
    }
    for (i = 0; i < 64; i++, buf += 4)
94
        c->lq[i] = AV_RL32(buf);
95
    for (i = 0; i < 64; i++, buf += 4)
96
        c->cq[i] = AV_RL32(buf);
97 98 99
    return 0;
}

100
/**
101
 * @brief set quantization tables from a quality value
102
 */
103 104
static void get_quant_quality(NuvContext *c, int quality)
{
105
    int i;
106
    quality = FFMAX(quality, 1);
107 108 109 110 111 112
    for (i = 0; i < 64; i++) {
        c->lq[i] = (fallback_lquant[i] << 7) / quality;
        c->cq[i] = (fallback_cquant[i] << 7) / quality;
    }
}

113 114 115
static int codec_reinit(AVCodecContext *avctx, int width, int height,
                        int quality)
{
116
    NuvContext *c = avctx->priv_data;
117 118
    int ret;

Reimar Döffinger's avatar
Reimar Döffinger committed
119 120
    width  = FFALIGN(width,  2);
    height = FFALIGN(height, 2);
121 122 123
    if (quality >= 0)
        get_quant_quality(c, quality);
    if (width != c->width || height != c->height) {
124
        // also reserve space for a possible additional header
125 126 127
        int buf_size = height * width * 3 / 2
                     + FFMAX(AV_LZO_OUTPUT_PADDING, FF_INPUT_BUFFER_PADDING_SIZE)
                     + RTJPEG_HEADER_SIZE;
128
        if (buf_size > INT_MAX/8)
129
            return -1;
130 131
        if ((ret = av_image_check_size(height, width, 0, avctx)) < 0)
            return ret;
132
        avctx->width  = c->width  = width;
133
        avctx->height = c->height = height;
134
        av_fast_malloc(&c->decomp_buf, &c->decomp_size,
135
                       buf_size);
136
        if (!c->decomp_buf) {
137 138
            av_log(avctx, AV_LOG_ERROR,
                   "Can't allocate decompression buffer.\n");
139
            return AVERROR(ENOMEM);
140
        }
141
        ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
142
        av_frame_unref(c->pic);
143
        return 1;
144
    } else if (quality != c->quality)
145
        ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
146

147
    return 0;
148 149
}

150
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
151 152
                        AVPacket *avpkt)
{
153
    const uint8_t *buf = avpkt->data;
154 155 156 157
    int buf_size       = avpkt->size;
    NuvContext *c      = avctx->priv_data;
    AVFrame *picture   = data;
    int orig_size      = buf_size;
158
    int keyframe, ret;
159
    int size_change = 0;
160
    int result, init_frame = !avctx->frame_number;
161 162 163 164 165 166 167 168
    enum {
        NUV_UNCOMPRESSED  = '0',
        NUV_RTJPEG        = '1',
        NUV_RTJPEG_IN_LZO = '2',
        NUV_LZO           = '3',
        NUV_BLACK         = 'N',
        NUV_COPY_LAST     = 'L'
    } comptype;
169 170 171

    if (buf_size < 12) {
        av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
172
        return AVERROR_INVALIDDATA;
173 174 175 176 177 178
    }

    // codec data (rtjpeg quant tables)
    if (buf[0] == 'D' && buf[1] == 'R') {
        int ret;
        // skip rest of the frameheader.
179
        buf       = &buf[12];
180
        buf_size -= 12;
181
        ret       = get_quant(avctx, c, buf, buf_size);
182 183
        if (ret < 0)
            return ret;
184
        ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
185 186 187
        return orig_size;
    }

188
    if (buf_size < 12 || buf[0] != 'V') {
189
        av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
190
        return AVERROR_INVALIDDATA;
191 192
    }
    comptype = buf[1];
193
    switch (comptype) {
194 195 196 197 198 199 200 201 202 203
    case NUV_RTJPEG_IN_LZO:
    case NUV_RTJPEG:
        keyframe = !buf[2];
        break;
    case NUV_COPY_LAST:
        keyframe = 0;
        break;
    default:
        keyframe = 1;
        break;
204
    }
205
retry:
206
    // skip rest of the frameheader.
207
    buf       = &buf[12];
208
    buf_size -= 12;
209
    if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
210
        int outlen = c->decomp_size - FFMAX(FF_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING);
Luca Barbato's avatar
Luca Barbato committed
211
        int inlen  = buf_size;
212
        if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
213
            av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
214 215
            return AVERROR_INVALIDDATA;
        }
216
        buf      = c->decomp_buf;
217
        buf_size = c->decomp_size - FFMAX(FF_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING) - outlen;
218
        memset(c->decomp_buf + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
219
    }
220
    if (c->codec_frameheader) {
221
        int w, h, q;
222
        if (buf_size < RTJPEG_HEADER_SIZE) {
223 224 225 226 227 228 229 230
            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");
231
            return AVERROR_INVALIDDATA;
232
        }
233 234 235
        w = AV_RL16(&buf[6]);
        h = AV_RL16(&buf[8]);
        q = buf[10];
236 237
        if ((result = codec_reinit(avctx, w, h, q)) < 0)
            return result;
238
        if (result) {
239 240 241 242 243
            buf = avpkt->data;
            buf_size = avpkt->size;
            size_change = 1;
            goto retry;
        }
244
        buf       = &buf[RTJPEG_HEADER_SIZE];
245
        buf_size -= RTJPEG_HEADER_SIZE;
246
    }
247

248
    if (size_change || keyframe) {
249
        av_frame_unref(c->pic);
250 251
        init_frame = 1;
    }
252

253
    if ((result = ff_reget_buffer(avctx, c->pic)) < 0)
254
        return result;
255
    if (init_frame) {
256 257 258
        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);
259
    }
260

261 262
    c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
    c->pic->key_frame = keyframe;
263 264
    // decompress/copy/whatever data
    switch (comptype) {
265 266 267 268 269 270
    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;
271
        }
272
        if(height > 0)
273
            copy_frame(c->pic, buf, c->width, height);
274 275 276 277
        break;
    }
    case NUV_RTJPEG_IN_LZO:
    case NUV_RTJPEG:
278
        ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
279 280
        if (ret < 0)
            return ret;
281 282
        break;
    case NUV_BLACK:
283 284 285
        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);
286 287 288 289 290 291
        break;
    case NUV_COPY_LAST:
        /* nothing more to do here */
        break;
    default:
        av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
292
        return AVERROR_INVALIDDATA;
293 294
    }

295
    if ((result = av_frame_ref(picture, c->pic)) < 0)
296 297
        return result;

298
    *got_frame = 1;
299 300 301
    return orig_size;
}

302 303 304
static av_cold int decode_init(AVCodecContext *avctx)
{
    NuvContext *c  = avctx->priv_data;
305 306
    int ret;

307 308 309 310
    c->pic = av_frame_alloc();
    if (!c->pic)
        return AVERROR(ENOMEM);

311
    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
312 313 314 315 316
    c->decomp_buf  = NULL;
    c->quality     = -1;
    c->width       = 0;
    c->height      = 0;

317
    c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
318

319 320
    if (avctx->extradata_size)
        get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
321

322
    ff_rtjpeg_init(&c->rtj, avctx);
323

324 325
    if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
        return ret;
326

327 328 329
    return 0;
}

330 331
static av_cold int decode_end(AVCodecContext *avctx)
{
332
    NuvContext *c = avctx->priv_data;
333

334
    av_freep(&c->decomp_buf);
335
    av_frame_free(&c->pic);
336

337 338 339
    return 0;
}

340
AVCodec ff_nuv_decoder = {
341
    .name           = "nuv",
342
    .long_name      = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
343
    .type           = AVMEDIA_TYPE_VIDEO,
344
    .id             = AV_CODEC_ID_NUV,
345 346 347 348 349
    .priv_data_size = sizeof(NuvContext),
    .init           = decode_init,
    .close          = decode_end,
    .decode         = decode_frame,
    .capabilities   = CODEC_CAP_DR1,
350
};