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/intreadwrite.h" 23#include "avcodec.h" 24 25typedef struct PTXContext { 26 AVFrame picture; 27} PTXContext; 28 29static av_cold int ptx_init(AVCodecContext *avctx) { 30 PTXContext *s = avctx->priv_data; 31 32 avcodec_get_frame_defaults(&s->picture); 33 avctx->coded_frame= &s->picture; 34 35 return 0; 36} 37 38static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size, 39 AVPacket *avpkt) { 40 const uint8_t *buf = avpkt->data; 41 PTXContext * const s = avctx->priv_data; 42 AVFrame *picture = data; 43 AVFrame * const p = &s->picture; 44 unsigned int offset, w, h, y, stride, bytes_per_pixel; 45 uint8_t *ptr; 46 47 offset = AV_RL16(buf); 48 w = AV_RL16(buf+8); 49 h = AV_RL16(buf+10); 50 bytes_per_pixel = AV_RL16(buf+12) >> 3; 51 52 if (bytes_per_pixel != 2) { 53 av_log(avctx, AV_LOG_ERROR, "image format is not rgb15, please report on ffmpeg-users mailing list\n"); 54 return -1; 55 } 56 57 avctx->pix_fmt = PIX_FMT_RGB555; 58 59 if (offset != 0x2c) 60 av_log(avctx, AV_LOG_WARNING, "offset != 0x2c, untested due to lack of sample files\n"); 61 62 buf += offset; 63 64 if (p->data[0]) 65 avctx->release_buffer(avctx, p); 66 67 if (avcodec_check_dimensions(avctx, w, h)) 68 return -1; 69 if (w != avctx->width || h != avctx->height) 70 avcodec_set_dimensions(avctx, w, h); 71 if (avctx->get_buffer(avctx, p) < 0) { 72 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 73 return -1; 74 } 75 76 p->pict_type = FF_I_TYPE; 77 78 ptr = p->data[0]; 79 stride = p->linesize[0]; 80 81 for (y=0; y<h; y++) { 82#if HAVE_BIGENDIAN 83 unsigned int x; 84 for (x=0; x<w*bytes_per_pixel; x+=bytes_per_pixel) 85 AV_WN16(ptr+x, AV_RL16(buf+x)); 86#else 87 memcpy(ptr, buf, w*bytes_per_pixel); 88#endif 89 ptr += stride; 90 buf += w*bytes_per_pixel; 91 } 92 93 *picture = s->picture; 94 *data_size = sizeof(AVPicture); 95 96 return offset + w*h*bytes_per_pixel; 97} 98 99static av_cold int ptx_end(AVCodecContext *avctx) { 100 PTXContext *s = avctx->priv_data; 101 102 if(s->picture.data[0]) 103 avctx->release_buffer(avctx, &s->picture); 104 105 return 0; 106} 107 108AVCodec ptx_decoder = { 109 "ptx", 110 AVMEDIA_TYPE_VIDEO, 111 CODEC_ID_PTX, 112 sizeof(PTXContext), 113 ptx_init, 114 NULL, 115 ptx_end, 116 ptx_decode_frame, 117 CODEC_CAP_DR1, 118 NULL, 119 .long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"), 120}; 121