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 + AV_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                         AVPacket *avpkt) {
 132     const uint8_t *buf = avpkt->data;
 133     int buf_size = avpkt->size;
 134     NuvContext *c = avctx->priv_data;
 135     AVFrame *picture = data;
 136     int orig_size = buf_size;
 137     int keyframe;
 138     int result;
 139     enum {NUV_UNCOMPRESSED = '0', NUV_RTJPEG = '1',
 140           NUV_RTJPEG_IN_LZO = '2', NUV_LZO = '3',
 141           NUV_BLACK = 'N', NUV_COPY_LAST = 'L'} comptype;
 142
 143     if (buf_size < 12) {
 144         av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
 145         return -1;
 146     }
 147
 148     // codec data (rtjpeg quant tables)
 149     if (buf[0] == 'D' && buf[1] == 'R') {
 150         int ret;
 151         // skip rest of the frameheader.
 152         buf = &buf[12];
 153         buf_size -= 12;
 154         ret = get_quant(avctx, c, buf, buf_size);
 155         if (ret < 0)
 156             return ret;
 157         rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq);
 158         return orig_size;
 159     }
 160
 161     if (buf[0] != 'V' || buf_size < 12) {
 162         av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
 163         return -1;
 164     }
 165     comptype = buf[1];
 166     switch (comptype) {
 167         case NUV_RTJPEG_IN_LZO:
 168         case NUV_RTJPEG:
 169             keyframe = !buf[2]; break;
 170         case NUV_COPY_LAST:
 171             keyframe = 0; break;
 172         default:
 173             keyframe = 1; break;
 174     }
 175     // skip rest of the frameheader.
 176     buf = &buf[12];
 177     buf_size -= 12;
 178     if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
 179         int outlen = c->decomp_size, inlen = buf_size;
 180         if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
 181             av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
 182         buf = c->decomp_buf;
 183         buf_size = c->decomp_size;
 184     }
 185     if (c->codec_frameheader) {
 186         int w, h, q;
 187         if (buf_size < 12) {
 188             av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame\n");
 189             return -1;
 190         }
 191         w = AV_RL16(&buf[6]);
 192         h = AV_RL16(&buf[8]);
 193         q = buf[10];
 194         if (!codec_reinit(avctx, w, h, q))
 195             return -1;
 196         buf = &buf[12];
 197         buf_size -= 12;
 198     }
 199
 200     if (keyframe && c->pic.data[0])
 201         avctx->release_buffer(avctx, &c->pic);
 202     c->pic.reference = 3;
 203     c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
 204                           FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 205     result = avctx->reget_buffer(avctx, &c->pic);
 206     if (result < 0) {
 207         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 208         return -1;
 209     }
 210
 211     c->pic.pict_type = keyframe ? FF_I_TYPE : FF_P_TYPE;
 212     c->pic.key_frame = keyframe;
 213     // decompress/copy/whatever data
 214     switch (comptype) {
 215         case NUV_LZO:
 216         case NUV_UNCOMPRESSED: {
 217             int height = c->height;
 218             if (buf_size < c->width * height * 3 / 2) {
 219                 av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
 220                 height = buf_size / c->width / 3 * 2;
 221             }
 222             copy_frame(&c->pic, buf, c->width, height);
 223             break;
 224         }
 225         case NUV_RTJPEG_IN_LZO:
 226         case NUV_RTJPEG: {
 227             rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
 228             break;
 229         }
 230         case NUV_BLACK: {
 231             memset(c->pic.data[0], 0, c->width * c->height);
 232             memset(c->pic.data[1], 128, c->width * c->height / 4);
 233             memset(c->pic.data[2], 128, c->width * c->height / 4);
 234             break;
 235         }
 236         case NUV_COPY_LAST: {
 237             /* nothing more to do here */
 238             break;
 239         }
 240         default:
 241             av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
 242             return -1;
 243     }
 244
 245     *picture = c->pic;
 246     *data_size = sizeof(AVFrame);
 247     return orig_size;
 248 }
 249
 250 static av_cold int decode_init(AVCodecContext *avctx) {
 251     NuvContext *c = avctx->priv_data;
 252     avctx->pix_fmt = PIX_FMT_YUV420P;
 253     c->pic.data[0] = NULL;
 254     c->decomp_buf = NULL;
 255     c->quality = -1;
 256     c->width = 0;
 257     c->height = 0;
 258     c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
 259     if (avctx->extradata_size)
 260         get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
 261     dsputil_init(&c->dsp, avctx);
 262     if (!codec_reinit(avctx, avctx->width, avctx->height, -1))
 263         return 1;
 264     return 0;
 265 }
 266
 267 static av_cold int decode_end(AVCodecContext *avctx) {
 268     NuvContext *c = avctx->priv_data;
 269     av_freep(&c->decomp_buf);
 270     if (c->pic.data[0])
 271         avctx->release_buffer(avctx, &c->pic);
 272     return 0;
 273 }
 274
 275 AVCodec nuv_decoder = {
 276     "nuv",
 277     CODEC_TYPE_VIDEO,
 278     CODEC_ID_NUV,
 279     sizeof(NuvContext),
 280     decode_init,
 281     NULL,
 282     decode_end,
 283     decode_frame,
 284     CODEC_CAP_DR1,
 285     .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
 286 };
 287