extern/ffmpeg/libavcodec/cscd.c

   1 /*
   2  * CamStudio decoder
   3  * Copyright (c) 2006 Reimar Doeffinger
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21
  22 #include "common.h"
  23 #include "avcodec.h"
  24
  25 #ifdef CONFIG_ZLIB
  26 #include <zlib.h>
  27 #endif
  28 #include "lzo.h"
  29
  30 typedef struct {
  31     AVFrame pic;
  32     int linelen, height, bpp;
  33     unsigned int decomp_size;
  34     unsigned char* decomp_buf;
  35 } CamStudioContext;
  36
  37 static void copy_frame_default(AVFrame *f, uint8_t *src,
  38                                int linelen, int height) {
  39     int i;
  40     uint8_t *dst = f->data[0];
  41     dst += (height - 1) * f->linesize[0];
  42     for (i = height; i; i--) {
  43         memcpy(dst, src, linelen);
  44         src += linelen;
  45         dst -= f->linesize[0];
  46     }
  47 }
  48
  49 static void add_frame_default(AVFrame *f, uint8_t *src,
  50                               int linelen, int height) {
  51     int i, j;
  52     uint8_t *dst = f->data[0];
  53     dst += (height - 1) * f->linesize[0];
  54     for (i = height; i; i--) {
  55         for (j = linelen; j; j--)
  56             *dst++ += *src++;
  57         dst -= f->linesize[0] + linelen;
  58     }
  59 }
  60
  61 #ifndef WORDS_BIGENDIAN
  62 #define copy_frame_16 copy_frame_default
  63 #define copy_frame_32 copy_frame_default
  64 #define add_frame_16 add_frame_default
  65 #define add_frame_32 add_frame_default
  66 #else
  67 static void copy_frame_16(AVFrame *f, uint8_t *src,
  68                           int linelen, int height) {
  69     int i, j;
  70     uint8_t *dst = f->data[0];
  71     dst += (height - 1) * f->linesize[0];
  72     for (i = height; i; i--) {
  73         for (j = linelen / 2; j; j--) {
  74           dst[0] = src[1];
  75           dst[1] = src[0];
  76           src += 2;
  77           dst += 2;
  78         }
  79         dst -= f->linesize[0] + linelen;
  80     }
  81 }
  82
  83 static void copy_frame_32(AVFrame *f, uint8_t *src,
  84                           int linelen, int height) {
  85     int i, j;
  86     uint8_t *dst = f->data[0];
  87     dst += (height - 1) * f->linesize[0];
  88     for (i = height; i; i--) {
  89         for (j = linelen / 4; j; j--) {
  90           dst[0] = src[3];
  91           dst[1] = src[2];
  92           dst[2] = src[1];
  93           dst[3] = src[0];
  94           src += 4;
  95           dst += 4;
  96         }
  97         dst -= f->linesize[0] + linelen;
  98     }
  99 }
 100
 101 static void add_frame_16(AVFrame *f, uint8_t *src,
 102                          int linelen, int height) {
 103     int i, j;
 104     uint8_t *dst = f->data[0];
 105     dst += (height - 1) * f->linesize[0];
 106     for (i = height; i; i--) {
 107         for (j = linelen / 2; j; j--) {
 108           dst[0] += src[1];
 109           dst[1] += src[0];
 110           src += 2;
 111           dst += 2;
 112         }
 113         dst -= f->linesize[0] + linelen;
 114     }
 115 }
 116
 117 static void add_frame_32(AVFrame *f, uint8_t *src,
 118                          int linelen, int height) {
 119     int i, j;
 120     uint8_t *dst = f->data[0];
 121     dst += (height - 1) * f->linesize[0];
 122     for (i = height; i; i--) {
 123         for (j = linelen / 4; j; j--) {
 124           dst[0] += src[3];
 125           dst[1] += src[2];
 126           dst[2] += src[1];
 127           dst[3] += src[0];
 128           src += 4;
 129           dst += 4;
 130         }
 131         dst -= f->linesize[0] + linelen;
 132     }
 133 }
 134 #endif
 135
 136 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
 137                         uint8_t *buf, int buf_size) {
 138     CamStudioContext *c = (CamStudioContext *)avctx->priv_data;
 139     AVFrame *picture = data;
 140
 141     if (buf_size < 2) {
 142         av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
 143         return -1;
 144     }
 145
 146     if (c->pic.data[0])
 147         avctx->release_buffer(avctx, &c->pic);
 148     c->pic.reference = 1;
 149     c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
 150                           FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 151     if (avctx->get_buffer(avctx, &c->pic) < 0) {
 152         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 153         return -1;
 154     }
 155
 156     // decompress data
 157     switch ((buf[0] >> 1) & 7) {
 158         case 0: { // lzo compression
 159             int outlen = c->decomp_size, inlen = buf_size - 2;
 160             if (lzo1x_decode(c->decomp_buf, &outlen, &buf[2], &inlen))
 161                 av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
 162             break;
 163         }
 164         case 1: { // zlib compression
 165 #ifdef CONFIG_ZLIB
 166             unsigned long dlen = c->decomp_size;
 167             if (uncompress(c->decomp_buf, &dlen, &buf[2], buf_size - 2) != Z_OK)
 168                 av_log(avctx, AV_LOG_ERROR, "error during zlib decompression\n");
 169             break;
 170 #else
 171             av_log(avctx, AV_LOG_ERROR, "compiled without zlib support\n");
 172             return -1;
 173 #endif
 174         }
 175         default:
 176             av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
 177             return -1;
 178     }
 179
 180     // flip upside down, add difference frame
 181     if (buf[0] & 1) { // keyframe
 182         c->pic.pict_type = FF_I_TYPE;
 183         c->pic.key_frame = 1;
 184         switch (c->bpp) {
 185           case 16:
 186               copy_frame_16(&c->pic, c->decomp_buf, c->linelen, c->height);
 187               break;
 188           case 32:
 189               copy_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height);
 190               break;
 191           default:
 192               copy_frame_default(&c->pic, c->decomp_buf, c->linelen, c->height);
 193         }
 194     } else {
 195         c->pic.pict_type = FF_P_TYPE;
 196         c->pic.key_frame = 0;
 197         switch (c->bpp) {
 198           case 16:
 199               add_frame_16(&c->pic, c->decomp_buf, c->linelen, c->height);
 200               break;
 201           case 32:
 202               add_frame_32(&c->pic, c->decomp_buf, c->linelen, c->height);
 203               break;
 204           default:
 205               add_frame_default(&c->pic, c->decomp_buf, c->linelen, c->height);
 206         }
 207     }
 208
 209     *picture = c->pic;
 210     *data_size = sizeof(AVFrame);
 211     return buf_size;
 212 }
 213
 214 static int decode_init(AVCodecContext *avctx) {
 215     CamStudioContext *c = (CamStudioContext *)avctx->priv_data;
 216     if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
 217         return 1;
 218     }
 219     avctx->has_b_frames = 0;
 220     switch (avctx->bits_per_sample) {
 221         case 16: avctx->pix_fmt = PIX_FMT_RGB565; break;
 222         case 24: avctx->pix_fmt = PIX_FMT_BGR24; break;
 223         case 32: avctx->pix_fmt = PIX_FMT_RGBA32; break;
 224         default:
 225             av_log(avctx, AV_LOG_ERROR,
 226                    "CamStudio codec error: unvalid depth %i bpp\n",
 227                    avctx->bits_per_sample);
 228              return 1;
 229     }
 230     c->bpp = avctx->bits_per_sample;
 231     c->pic.data[0] = NULL;
 232     c->linelen = avctx->width * avctx->bits_per_sample / 8;
 233     c->height = avctx->height;
 234     c->decomp_size = c->height * c->linelen;
 235     c->decomp_buf = av_malloc(c->decomp_size + LZO_OUTPUT_PADDING);
 236     if (!c->decomp_buf) {
 237         av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
 238         return 1;
 239     }
 240     return 0;
 241 }
 242
 243 static int decode_end(AVCodecContext *avctx) {
 244     CamStudioContext *c = (CamStudioContext *)avctx->priv_data;
 245     av_freep(&c->decomp_buf);
 246     if (c->pic.data[0])
 247         avctx->release_buffer(avctx, &c->pic);
 248     return 0;
 249 }
 250
 251 AVCodec cscd_decoder = {
 252     "camstudio",
 253     CODEC_TYPE_VIDEO,
 254     CODEC_ID_CSCD,
 255     sizeof(CamStudioContext),
 256     decode_init,
 257     NULL,
 258     decode_end,
 259     decode_frame,
 260     CODEC_CAP_DR1,
 261 };
 262