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  1. /*
  2.  * V.Flash PTX (.ptx) image decoder
  3.  * Copyright (c) 2007 Ivo van Poorten
  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 "libavutil/common.h"
  23. #include "libavutil/intreadwrite.h"
  24. #include "libavutil/imgutils.h"
  25. #include "avcodec.h"
  26. #include "internal.h"
  27.  
  28. static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
  29.                             AVPacket *avpkt) {
  30.     const uint8_t *buf = avpkt->data;
  31.     const uint8_t *buf_end = avpkt->data + avpkt->size;
  32.     AVFrame * const p = data;
  33.     unsigned int offset, w, h, y, stride, bytes_per_pixel;
  34.     int ret;
  35.     uint8_t *ptr;
  36.  
  37.     if (buf_end - buf < 14)
  38.         return AVERROR_INVALIDDATA;
  39.     offset          = AV_RL16(buf);
  40.     w               = AV_RL16(buf+8);
  41.     h               = AV_RL16(buf+10);
  42.     bytes_per_pixel = AV_RL16(buf+12) >> 3;
  43.  
  44.     if (bytes_per_pixel != 2) {
  45.         avpriv_request_sample(avctx, "Image format not RGB15");
  46.         return AVERROR_PATCHWELCOME;
  47.     }
  48.  
  49.     avctx->pix_fmt = AV_PIX_FMT_BGR555LE;
  50.  
  51.     if (buf_end - buf < offset)
  52.         return AVERROR_INVALIDDATA;
  53.     if (offset != 0x2c)
  54.         avpriv_request_sample(avctx, "offset != 0x2c");
  55.  
  56.     buf += offset;
  57.  
  58.     if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
  59.         return ret;
  60.     if (w != avctx->width || h != avctx->height)
  61.         avcodec_set_dimensions(avctx, w, h);
  62.     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
  63.         return ret;
  64.  
  65.     p->pict_type = AV_PICTURE_TYPE_I;
  66.  
  67.     ptr    = p->data[0];
  68.     stride = p->linesize[0];
  69.  
  70.     for (y = 0; y < h && buf_end - buf >= w * bytes_per_pixel; y++) {
  71.         memcpy(ptr, buf, w*bytes_per_pixel);
  72.         ptr += stride;
  73.         buf += w*bytes_per_pixel;
  74.     }
  75.  
  76.     *got_frame = 1;
  77.  
  78.     if (y < h) {
  79.         av_log(avctx, AV_LOG_WARNING, "incomplete packet\n");
  80.         return avpkt->size;
  81.     }
  82.  
  83.     return offset + w*h*bytes_per_pixel;
  84. }
  85.  
  86. AVCodec ff_ptx_decoder = {
  87.     .name           = "ptx",
  88.     .long_name      = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),
  89.     .type           = AVMEDIA_TYPE_VIDEO,
  90.     .id             = AV_CODEC_ID_PTX,
  91.     .decode         = ptx_decode_frame,
  92.     .capabilities   = CODEC_CAP_DR1,
  93. };
  94.