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