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https://github.com/FFmpeg/FFmpeg.git
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130 lines
3.6 KiB
C
130 lines
3.6 KiB
C
/*
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* V.Flash PTX (.ptx) image decoder
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* Copyright (c) 2007 Ivo van Poorten
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/intreadwrite.h"
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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typedef struct PTXContext {
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AVFrame picture;
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} PTXContext;
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static av_cold int ptx_init(AVCodecContext *avctx) {
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PTXContext *s = avctx->priv_data;
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avcodec_get_frame_defaults(&s->picture);
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avctx->coded_frame= &s->picture;
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return 0;
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}
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static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
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AVPacket *avpkt) {
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const uint8_t *buf = avpkt->data;
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const uint8_t *buf_end = avpkt->data + avpkt->size;
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PTXContext * const s = avctx->priv_data;
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AVFrame *picture = data;
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AVFrame * const p = &s->picture;
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unsigned int offset, w, h, y, stride, bytes_per_pixel;
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uint8_t *ptr;
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if (buf_end - buf < 14)
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return AVERROR_INVALIDDATA;
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offset = AV_RL16(buf);
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w = AV_RL16(buf+8);
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h = AV_RL16(buf+10);
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bytes_per_pixel = AV_RL16(buf+12) >> 3;
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if (bytes_per_pixel != 2) {
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av_log_ask_for_sample(avctx, "Image format is not RGB15.\n");
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return -1;
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}
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avctx->pix_fmt = PIX_FMT_RGB555;
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if (buf_end - buf < offset)
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return AVERROR_INVALIDDATA;
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if (offset != 0x2c)
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av_log_ask_for_sample(avctx, "offset != 0x2c\n");
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buf += offset;
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if (p->data[0])
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avctx->release_buffer(avctx, p);
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if (av_image_check_size(w, h, 0, avctx))
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return -1;
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if (w != avctx->width || h != avctx->height)
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avcodec_set_dimensions(avctx, w, h);
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if (avctx->get_buffer(avctx, p) < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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p->pict_type = AV_PICTURE_TYPE_I;
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ptr = p->data[0];
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stride = p->linesize[0];
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for (y = 0; y < h && buf_end - buf >= w * bytes_per_pixel; y++) {
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#if HAVE_BIGENDIAN
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unsigned int x;
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for (x=0; x<w*bytes_per_pixel; x+=bytes_per_pixel)
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AV_WN16(ptr+x, AV_RL16(buf+x));
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#else
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memcpy(ptr, buf, w*bytes_per_pixel);
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#endif
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ptr += stride;
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buf += w*bytes_per_pixel;
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}
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*picture = s->picture;
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*data_size = sizeof(AVPicture);
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if (y < h) {
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av_log(avctx, AV_LOG_WARNING, "incomplete packet\n");
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return avpkt->size;
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}
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return offset + w*h*bytes_per_pixel;
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}
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static av_cold int ptx_end(AVCodecContext *avctx) {
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PTXContext *s = avctx->priv_data;
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if(s->picture.data[0])
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avctx->release_buffer(avctx, &s->picture);
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return 0;
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}
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AVCodec ff_ptx_decoder = {
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.name = "ptx",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_PTX,
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.priv_data_size = sizeof(PTXContext),
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.init = ptx_init,
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.close = ptx_end,
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.decode = ptx_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),
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};
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