ffmpeg/libavcodec/nuv.c

   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 {
  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     AVPicture pic;
  79     avpicture_fill(&pic, src, AV_PIX_FMT_YUV420P, width, height);
  80     av_picture_copy((AVPicture *)f, &pic, AV_PIX_FMT_YUV420P, width, height);
  81 }
  82
  83 /**
  84  * @brief extract quantization tables from codec data into our context
  85  */
  86 static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
  87                      int size)
  88 {
  89     int i;
  90     if (size < 2 * 64 * 4) {
  91         av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
  92         return AVERROR_INVALIDDATA;
  93     }
  94     for (i = 0; i < 64; i++, buf += 4)
  95         c->lq[i] = AV_RL32(buf);
  96     for (i = 0; i < 64; i++, buf += 4)
  97         c->cq[i] = AV_RL32(buf);
  98     return 0;
  99 }
 100
 101 /**
 102  * @brief set quantization tables from a quality value
 103  */
 104 static void get_quant_quality(NuvContext *c, int quality)
 105 {
 106     int i;
 107     quality = FFMAX(quality, 1);
 108     for (i = 0; i < 64; i++) {
 109         c->lq[i] = (fallback_lquant[i] << 7) / quality;
 110         c->cq[i] = (fallback_cquant[i] << 7) / quality;
 111     }
 112 }
 113
 114 static int codec_reinit(AVCodecContext *avctx, int width, int height,
 115                         int quality)
 116 {
 117     NuvContext *c = avctx->priv_data;
 118     int ret;
 119
 120     width  = FFALIGN(width,  2);
 121     height = FFALIGN(height, 2);
 122     if (quality >= 0)
 123         get_quant_quality(c, quality);
 124     if (width != c->width || height != c->height) {
 125         // also reserve space for a possible additional header
 126         int buf_size = height * width * 3 / 2
 127                      + FFMAX(AV_LZO_OUTPUT_PADDING, FF_INPUT_BUFFER_PADDING_SIZE)
 128                      + RTJPEG_HEADER_SIZE;
 129         if (buf_size > INT_MAX/8)
 130             return -1;
 131         if ((ret = av_image_check_size(height, width, 0, avctx)) < 0)
 132             return ret;
 133         avctx->width  = c->width  = width;
 134         avctx->height = c->height = height;
 135         av_fast_malloc(&c->decomp_buf, &c->decomp_size,
 136                        buf_size);
 137         if (!c->decomp_buf) {
 138             av_log(avctx, AV_LOG_ERROR,
 139                    "Can't allocate decompression buffer.\n");
 140             return AVERROR(ENOMEM);
 141         }
 142         ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
 143         av_frame_unref(c->pic);
 144         return 1;
 145     } else if (quality != c->quality)
 146         ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
 147
 148     return 0;
 149 }
 150
 151 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
 152                         AVPacket *avpkt)
 153 {
 154     const uint8_t *buf = avpkt->data;
 155     int buf_size       = avpkt->size;
 156     NuvContext *c      = avctx->priv_data;
 157     AVFrame *picture   = data;
 158     int orig_size      = buf_size;
 159     int keyframe, ret;
 160     int size_change = 0;
 161     int result, init_frame = !avctx->frame_number;
 162     enum {
 163         NUV_UNCOMPRESSED  = '0',
 164         NUV_RTJPEG        = '1',
 165         NUV_RTJPEG_IN_LZO = '2',
 166         NUV_LZO           = '3',
 167         NUV_BLACK         = 'N',
 168         NUV_COPY_LAST     = 'L'
 169     } comptype;
 170
 171     if (buf_size < 12) {
 172         av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
 173         return AVERROR_INVALIDDATA;
 174     }
 175
 176     // codec data (rtjpeg quant tables)
 177     if (buf[0] == 'D' && buf[1] == 'R') {
 178         int ret;
 179         // skip rest of the frameheader.
 180         buf       = &buf[12];
 181         buf_size -= 12;
 182         ret       = get_quant(avctx, c, buf, buf_size);
 183         if (ret < 0)
 184             return ret;
 185         ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
 186         return orig_size;
 187     }
 188
 189     if (buf_size < 12 || buf[0] != 'V') {
 190         av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
 191         return AVERROR_INVALIDDATA;
 192     }
 193     comptype = buf[1];
 194     switch (comptype) {
 195     case NUV_RTJPEG_IN_LZO:
 196     case NUV_RTJPEG:
 197         keyframe = !buf[2];
 198         break;
 199     case NUV_COPY_LAST:
 200         keyframe = 0;
 201         break;
 202     default:
 203         keyframe = 1;
 204         break;
 205     }
 206 retry:
 207     // skip rest of the frameheader.
 208     buf       = &buf[12];
 209     buf_size -= 12;
 210     if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
 211         int outlen = c->decomp_size - FFMAX(FF_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING);
 212         int inlen  = buf_size;
 213         if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
 214             av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
 215             return AVERROR_INVALIDDATA;
 216         }
 217         buf      = c->decomp_buf;
 218         buf_size = c->decomp_size - FFMAX(FF_INPUT_BUFFER_PADDING_SIZE, AV_LZO_OUTPUT_PADDING) - outlen;
 219         memset(c->decomp_buf + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
 220     }
 221     if (c->codec_frameheader) {
 222         int w, h, q;
 223         if (buf_size < RTJPEG_HEADER_SIZE) {
 224             av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n");
 225             return AVERROR_INVALIDDATA;
 226         }
 227         // There seem to exist two variants of this header: one starts with 'V'
 228         // and 5 bytes unknown, the other matches current MythTV and is 4 bytes size,
 229         // 1 byte header size (== 12), 1 byte version (== 0)
 230         if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) {
 231             av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\n");
 232             return AVERROR_INVALIDDATA;
 233         }
 234         w = AV_RL16(&buf[6]);
 235         h = AV_RL16(&buf[8]);
 236         q = buf[10];
 237         if ((result = codec_reinit(avctx, w, h, q)) < 0)
 238             return result;
 239         if (result) {
 240             buf = avpkt->data;
 241             buf_size = avpkt->size;
 242             size_change = 1;
 243             goto retry;
 244         }
 245         buf       = &buf[RTJPEG_HEADER_SIZE];
 246         buf_size -= RTJPEG_HEADER_SIZE;
 247     }
 248
 249     if (size_change || keyframe) {
 250         av_frame_unref(c->pic);
 251         init_frame = 1;
 252     }
 253
 254     if ((result = ff_reget_buffer(avctx, c->pic)) < 0)
 255         return result;
 256     if (init_frame) {
 257         memset(c->pic->data[0], 0,    avctx->height * c->pic->linesize[0]);
 258         memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2);
 259         memset(c->pic->data[2], 0x80, avctx->height * c->pic->linesize[2] / 2);
 260     }
 261
 262     c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
 263     c->pic->key_frame = keyframe;
 264     // decompress/copy/whatever data
 265     switch (comptype) {
 266     case NUV_LZO:
 267     case NUV_UNCOMPRESSED: {
 268         int height = c->height;
 269         if (buf_size < c->width * height * 3 / 2) {
 270             av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
 271             height = buf_size / c->width / 3 * 2;
 272         }
 273         if(height > 0)
 274             copy_frame(c->pic, buf, c->width, height);
 275         break;
 276     }
 277     case NUV_RTJPEG_IN_LZO:
 278     case NUV_RTJPEG:
 279         ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
 280         if (ret < 0)
 281             return ret;
 282         break;
 283     case NUV_BLACK:
 284         memset(c->pic->data[0], 0, c->width * c->height);
 285         memset(c->pic->data[1], 128, c->width * c->height / 4);
 286         memset(c->pic->data[2], 128, c->width * c->height / 4);
 287         break;
 288     case NUV_COPY_LAST:
 289         /* nothing more to do here */
 290         break;
 291     default:
 292         av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
 293         return AVERROR_INVALIDDATA;
 294     }
 295
 296     if ((result = av_frame_ref(picture, c->pic)) < 0)
 297         return result;
 298
 299     *got_frame = 1;
 300     return orig_size;
 301 }
 302
 303 static av_cold int decode_init(AVCodecContext *avctx)
 304 {
 305     NuvContext *c  = avctx->priv_data;
 306     int ret;
 307
 308     c->pic = av_frame_alloc();
 309     if (!c->pic)
 310         return AVERROR(ENOMEM);
 311
 312     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
 313     c->decomp_buf  = NULL;
 314     c->quality     = -1;
 315     c->width       = 0;
 316     c->height      = 0;
 317
 318     c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
 319
 320     if (avctx->extradata_size)
 321         get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
 322
 323     ff_rtjpeg_init(&c->rtj, avctx);
 324
 325     if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
 326         return ret;
 327
 328     return 0;
 329 }
 330
 331 static av_cold int decode_end(AVCodecContext *avctx)
 332 {
 333     NuvContext *c = avctx->priv_data;
 334
 335     av_freep(&c->decomp_buf);
 336     av_frame_free(&c->pic);
 337
 338     return 0;
 339 }
 340
 341 AVCodec ff_nuv_decoder = {
 342     .name           = "nuv",
 343     .long_name      = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
 344     .type           = AVMEDIA_TYPE_VIDEO,
 345     .id             = AV_CODEC_ID_NUV,
 346     .priv_data_size = sizeof(NuvContext),
 347     .init           = decode_init,
 348     .close          = decode_end,
 349     .decode         = decode_frame,
 350     .capabilities   = CODEC_CAP_DR1,
 351 };