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 #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
  30 typedef 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
  42 static 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
  53 static 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  */
  71 static 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  */
  81 static 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  */
  98 static 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
 107 static 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 + 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
 130 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
 131                         const uint8_t *buf, int buf_size) {
 132     NuvContext *c = avctx->priv_data;
 133     AVFrame *picture = data;
 134     int orig_size = buf_size;
 135     enum {NUV_UNCOMPRESSED = '0', NUV_RTJPEG = '1',
 136           NUV_RTJPEG_IN_LZO = '2', NUV_LZO = '3',
 137           NUV_BLACK = 'N', NUV_COPY_LAST = 'L'} comptype;
 138
 139     if (buf_size < 12) {
 140         av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
 141         return -1;
 142     }
 143
 144     // codec data (rtjpeg quant tables)
 145     if (buf[0] == 'D' && buf[1] == 'R') {
 146         int ret;
 147         // skip rest of the frameheader.
 148         buf = &buf[12];
 149         buf_size -= 12;
 150         ret = get_quant(avctx, c, buf, buf_size);
 151         if (ret < 0)
 152             return ret;
 153         rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
 154         return orig_size;
 155     }
 156
 157     if (buf[0] != 'V' || buf_size < 12) {
 158         av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
 159         return -1;
 160     }
 161     comptype = buf[1];
 162     // skip rest of the frameheader.
 163     buf = &buf[12];
 164     buf_size -= 12;
 165     if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
 166         int outlen = c->decomp_size, inlen = buf_size;
 167         if (lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
 168             av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
 169         buf = c->decomp_buf;
 170         buf_size = c->decomp_size;
 171     }
 172     if (c->codec_frameheader) {
 173         int w, h, q;
 174         if (buf_size < 12) {
 175             av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame\n");
 176             return -1;
 177         }
 178         w = AV_RL16(&buf[6]);
 179         h = AV_RL16(&buf[8]);
 180         q = buf[10];
 181         if (!codec_reinit(avctx, w, h, q))
 182             return -1;
 183         buf = &buf[12];
 184         buf_size -= 12;
 185     }
 186
 187     if (c->pic.data[0])
 188         avctx->release_buffer(avctx, &c->pic);
 189     c->pic.reference = 1;
 190     c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
 191                           FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 192     if (avctx->get_buffer(avctx, &c->pic) < 0) {
 193         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 194         return -1;
 195     }
 196
 197     c->pic.pict_type = FF_I_TYPE;
 198     c->pic.key_frame = 1;
 199     // decompress/copy/whatever data
 200     switch (comptype) {
 201         case NUV_LZO:
 202         case NUV_UNCOMPRESSED: {
 203             int height = c->height;
 204             if (buf_size < c->width * height * 3 / 2) {
 205                 av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
 206                 height = buf_size / c->width / 3 * 2;
 207             }
 208             copy_frame(&c->pic, buf, c->width, height);
 209             break;
 210         }
 211         case NUV_RTJPEG_IN_LZO:
 212         case NUV_RTJPEG: {
 213             rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
 214             break;
 215         }
 216         case NUV_BLACK: {
 217             memset(c->pic.data[0], 0, c->width * c->height);
 218             memset(c->pic.data[1], 128, c->width * c->height / 4);
 219             memset(c->pic.data[2], 128, c->width * c->height / 4);
 220             break;
 221         }
 222         case NUV_COPY_LAST: {
 223             c->pic.pict_type = FF_P_TYPE;
 224             c->pic.key_frame = 0;
 225             /* nothing more to do here */
 226             break;
 227         }
 228         default:
 229             av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
 230             return -1;
 231     }
 232
 233     *picture = c->pic;
 234     *data_size = sizeof(AVFrame);
 235     return orig_size;
 236 }
 237
 238 static av_cold int decode_init(AVCodecContext *avctx) {
 239     NuvContext *c = avctx->priv_data;
 240     avctx->pix_fmt = PIX_FMT_YUV420P;
 241     c->pic.data[0] = NULL;
 242     c->decomp_buf = NULL;
 243     c->quality = -1;
 244     c->width = 0;
 245     c->height = 0;
 246     c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
 247     if (avctx->extradata_size)
 248         get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
 249     dsputil_init(&c->dsp, avctx);
 250     if (!codec_reinit(avctx, avctx->width, avctx->height, -1))
 251         return 1;
 252     return 0;
 253 }
 254
 255 static av_cold int decode_end(AVCodecContext *avctx) {
 256     NuvContext *c = avctx->priv_data;
 257     av_freep(&c->decomp_buf);
 258     if (c->pic.data[0])
 259         avctx->release_buffer(avctx, &c->pic);
 260     return 0;
 261 }
 262
 263 AVCodec nuv_decoder = {
 264     "nuv",
 265     CODEC_TYPE_VIDEO,
 266     CODEC_ID_NUV,
 267     sizeof(NuvContext),
 268     decode_init,
 269     NULL,
 270     decode_end,
 271     decode_frame,
 272     CODEC_CAP_DR1,
 273     .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
 274 };
 275