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libavcodec/ptx.c

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00001 /*
00002  * V.Flash PTX (.ptx) image decoder
00003  * Copyright (c) 2007 Ivo van Poorten
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavutil/intreadwrite.h"
00023 #include "avcodec.h"
00024 
00025 typedef struct PTXContext {
00026     AVFrame picture;
00027 } PTXContext;
00028 
00029 static av_cold int ptx_init(AVCodecContext *avctx) {
00030     PTXContext *s = avctx->priv_data;
00031 
00032     avcodec_get_frame_defaults(&s->picture);
00033     avctx->coded_frame= &s->picture;
00034 
00035     return 0;
00036 }
00037 
00038 static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
00039                             const uint8_t *buf, int buf_size) {
00040     PTXContext * const s = avctx->priv_data;
00041     AVFrame *picture = data;
00042     AVFrame * const p = &s->picture;
00043     unsigned int offset, w, h, y, stride, bytes_per_pixel;
00044     uint8_t *ptr;
00045 
00046     offset          = AV_RL16(buf);
00047     w               = AV_RL16(buf+8);
00048     h               = AV_RL16(buf+10);
00049     bytes_per_pixel = AV_RL16(buf+12) >> 3;
00050 
00051     if (bytes_per_pixel != 2) {
00052         av_log(avctx, AV_LOG_ERROR, "image format is not rgb15, please report on ffmpeg-users mailing list\n");
00053         return -1;
00054     }
00055 
00056     avctx->pix_fmt = PIX_FMT_RGB555;
00057 
00058     if (offset != 0x2c)
00059         av_log(avctx, AV_LOG_WARNING, "offset != 0x2c, untested due to lack of sample files\n");
00060 
00061     buf += offset;
00062 
00063     if (p->data[0])
00064         avctx->release_buffer(avctx, p);
00065 
00066     if (avcodec_check_dimensions(avctx, w, h))
00067         return -1;
00068     if (w != avctx->width || h != avctx->height)
00069         avcodec_set_dimensions(avctx, w, h);
00070     if (avctx->get_buffer(avctx, p) < 0) {
00071         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00072         return -1;
00073     }
00074 
00075     p->pict_type = FF_I_TYPE;
00076 
00077     ptr    = p->data[0];
00078     stride = p->linesize[0];
00079 
00080     for (y=0; y<h; y++) {
00081 #ifdef WORDS_BIGENDIAN
00082         unsigned int x;
00083         for (x=0; x<w*bytes_per_pixel; x+=bytes_per_pixel)
00084             AV_WN16(ptr+x, AV_RL16(buf+x));
00085 #else
00086         memcpy(ptr, buf, w*bytes_per_pixel);
00087 #endif
00088         ptr += stride;
00089         buf += w*bytes_per_pixel;
00090     }
00091 
00092     *picture = s->picture;
00093     *data_size = sizeof(AVPicture);
00094 
00095     return offset + w*h*bytes_per_pixel;
00096 }
00097 
00098 static av_cold int ptx_end(AVCodecContext *avctx) {
00099     PTXContext *s = avctx->priv_data;
00100 
00101     if(s->picture.data[0])
00102         avctx->release_buffer(avctx, &s->picture);
00103 
00104     return 0;
00105 }
00106 
00107 AVCodec ptx_decoder = {
00108     "ptx",
00109     CODEC_TYPE_VIDEO,
00110     CODEC_ID_PTX,
00111     sizeof(PTXContext),
00112     ptx_init,
00113     NULL,
00114     ptx_end,
00115     ptx_decode_frame,
00116     0,
00117     NULL,
00118     .long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),
00119 };

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