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https://github.com/FFmpeg/FFmpeg.git
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20f9727018
Up until now, codec.h contains both public and private parts of AVCodec. This exposes the internals of AVCodec to users and leads them into the temptation of actually using them and forces us to forward-declare structures and types that users can't use at all. This commit changes this by adding a new structure FFCodec to codec_internal.h that extends AVCodec, i.e. contains the public AVCodec as first member; the private fields of AVCodec are moved to this structure, leaving codec.h clean. Reviewed-by: Anton Khirnov <anton@khirnov.net> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
105 lines
3.2 KiB
C
105 lines
3.2 KiB
C
/*
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* Microsoft Paint (MSP) version 2 decoder
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* Copyright (c) 2020 Peter Ross (pross@xvid.org)
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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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/**
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* @file
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* Microsoft Paint (MSP) version 2 decoder
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*/
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#include "avcodec.h"
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#include "bytestream.h"
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#include "codec_internal.h"
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#include "internal.h"
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static int msp2_decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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AVFrame *p = data;
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int ret;
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unsigned int x, y, width = (avctx->width + 7) / 8;
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GetByteContext idx, gb;
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if (buf_size <= 2 * avctx->height)
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return AVERROR_INVALIDDATA;
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avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
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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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p->key_frame = 1;
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bytestream2_init(&idx, buf, 2 * avctx->height);
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buf += 2 * avctx->height;
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buf_size -= 2 * avctx->height;
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for (y = 0; y < avctx->height; y++) {
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unsigned int pkt_size = bytestream2_get_le16(&idx);
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if (!pkt_size) {
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memset(p->data[0] + y * p->linesize[0], 0xFF, width);
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continue;
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}
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if (pkt_size > buf_size) {
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av_log(avctx, AV_LOG_WARNING, "image probably corrupt\n");
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pkt_size = buf_size;
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}
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bytestream2_init(&gb, buf, pkt_size);
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x = 0;
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while (bytestream2_get_bytes_left(&gb) && x < width) {
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int size = bytestream2_get_byte(&gb);
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if (size) {
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size = FFMIN(size, bytestream2_get_bytes_left(&gb));
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memcpy(p->data[0] + y * p->linesize[0] + x, gb.buffer, FFMIN(size, width - x));
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bytestream2_skip(&gb, size);
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} else {
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int value;
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size = bytestream2_get_byte(&gb);
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if (!size)
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avpriv_request_sample(avctx, "escape value");
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value = bytestream2_get_byte(&gb);
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memset(p->data[0] + y * p->linesize[0] + x, value, FFMIN(size, width - x));
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}
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x += size;
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}
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buf += pkt_size;
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buf_size -= pkt_size;
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}
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*got_frame = 1;
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return buf_size;
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}
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const FFCodec ff_msp2_decoder = {
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.p.name = "msp2",
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.p.long_name = NULL_IF_CONFIG_SMALL("Microsoft Paint (MSP) version 2"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_MSP2,
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.p.capabilities = AV_CODEC_CAP_DR1,
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.decode = msp2_decode_frame,
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};
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