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ffmpeg / libavcodec / ptx.c @ 72415b2a

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/*
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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 FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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 "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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    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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    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(avctx, AV_LOG_ERROR, "image format is not rgb15, please report on ffmpeg-users mailing list\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 (offset != 0x2c)
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        av_log(avctx, AV_LOG_WARNING, "offset != 0x2c, untested due to lack of sample files\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 (avcodec_check_dimensions(avctx, w, h))
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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 = FF_I_TYPE;
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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; 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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    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 ptx_decoder = {
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    "ptx",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_PTX,
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    sizeof(PTXContext),
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    ptx_init,
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    NULL,
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    ptx_end,
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    ptx_decode_frame,
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    CODEC_CAP_DR1,
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    NULL,
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    .long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),
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};