/* * V.Flash PTX (.ptx) image decoder * Copyright (c) 2007 Ivo van Poorten * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "avcodec.h" typedef struct PTXContext { AVFrame picture; } PTXContext; static int ptx_init(AVCodecContext *avctx) { PTXContext *s = avctx->priv_data; avcodec_get_frame_defaults(&s->picture); avctx->coded_frame= &s->picture; return 0; } static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) { PTXContext * const s = avctx->priv_data; AVFrame *picture = data; AVFrame * const p = &s->picture; unsigned int offset, w, h, y, stride, bytes_per_pixel; uint8_t *ptr; offset = AV_RL16(buf); w = AV_RL16(buf+8); h = AV_RL16(buf+10); bytes_per_pixel = AV_RL16(buf+12) >> 3; if (bytes_per_pixel != 2) { av_log(avctx, AV_LOG_ERROR, "image format is not rgb15, please report on ffmpeg-users mailing list\n"); return -1; } avctx->pix_fmt = PIX_FMT_RGB555; if (offset != 0x2c) av_log(avctx, AV_LOG_WARNING, "offset != 0x2c, untested due to lack of sample files\n"); buf += offset; if (p->data[0]) avctx->release_buffer(avctx, p); if (avcodec_check_dimensions(avctx, w, h)) return -1; if (w != avctx->width || h != avctx->height) avcodec_set_dimensions(avctx, w, h); if (avctx->get_buffer(avctx, p) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } p->pict_type = FF_I_TYPE; ptr = p->data[0]; stride = p->linesize[0]; for (y=0; y<h; y++) { #ifdef WORDS_BIGENDIAN unsigned int x; for (x=0; x<w*bytes_per_pixel; x+=bytes_per_pixel) AV_WN16(ptr+x, AV_RL16(buf+x)); #else memcpy(ptr, buf, w*bytes_per_pixel); #endif ptr += stride; buf += w*bytes_per_pixel; } *picture = s->picture; *data_size = sizeof(AVPicture); return offset + w*h*bytes_per_pixel; } static int ptx_end(AVCodecContext *avctx) { PTXContext *s = avctx->priv_data; if(s->picture.data[0]) avctx->release_buffer(avctx, &s->picture); return 0; } AVCodec ptx_decoder = { "ptx", CODEC_TYPE_VIDEO, CODEC_ID_PTX, sizeof(PTXContext), ptx_init, NULL, ptx_end, ptx_decode_frame, 0, NULL };