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This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
97 lines
2.8 KiB
C
97 lines
2.8 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 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/common.h"
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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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#include "codec_internal.h"
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#include "internal.h"
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static int ptx_decode_frame(AVCodecContext *avctx, AVFrame *p,
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int *got_frame, AVPacket *avpkt)
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{
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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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unsigned int offset, w, h, y, stride, bytes_per_pixel;
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int ret;
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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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avpriv_request_sample(avctx, "Image format not RGB15");
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return AVERROR_PATCHWELCOME;
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}
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avctx->pix_fmt = AV_PIX_FMT_BGR555LE;
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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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avpriv_request_sample(avctx, "offset != 0x2c");
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buf += offset;
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if (buf_end - buf < w * bytes_per_pixel)
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return AVERROR_INVALIDDATA;
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if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
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return ret;
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
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return ret;
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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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memcpy(ptr, buf, w*bytes_per_pixel);
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ptr += stride;
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buf += w*bytes_per_pixel;
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}
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*got_frame = 1;
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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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const FFCodec ff_ptx_decoder = {
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.p.name = "ptx",
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.p.long_name = NULL_IF_CONFIG_SMALL("V.Flash PTX image"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_PTX,
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.p.capabilities = AV_CODEC_CAP_DR1,
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FF_CODEC_DECODE_CB(ptx_decode_frame),
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};
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