222 lines
7 KiB
C
222 lines
7 KiB
C
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/*
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* PC Paintbrush PCX (.pcx) image encoder
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* Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
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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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* PCX image encoder
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* @author Daniel Verkamp
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* @see http://bespin.org/~qz/pc-gpe/pcx.txt
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*/
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#include "avcodec.h"
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#include "bytestream.h"
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#include "libavutil/imgutils.h"
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#include "internal.h"
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static const uint32_t monoblack_pal[16] = { 0x000000, 0xFFFFFF };
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static av_cold int pcx_encode_init(AVCodecContext *avctx)
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{
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#if FF_API_CODED_FRAME
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FF_DISABLE_DEPRECATION_WARNINGS
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avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
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avctx->coded_frame->key_frame = 1;
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FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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return 0;
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}
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/**
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* PCX run-length encoder
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* @param dst output buffer
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* @param dst_size size of output buffer
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* @param src input buffer
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* @param src_plane_size size of one plane of input buffer in bytes
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* @param nplanes number of planes in input buffer
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* @return number of bytes written to dst or -1 on error
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* @bug will not work for nplanes != 1 && bpp != 8
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*/
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static int pcx_rle_encode( uint8_t *dst, int dst_size,
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const uint8_t *src, int src_plane_size, int nplanes)
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{
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int p;
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const uint8_t *dst_start = dst;
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// check worst-case upper bound on dst_size
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if (dst_size < 2LL * src_plane_size * nplanes || src_plane_size <= 0)
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return AVERROR(EINVAL);
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for (p = 0; p < nplanes; p++) {
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int count = 1;
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const uint8_t *src_plane = src + p;
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const uint8_t *src_plane_end = src_plane + src_plane_size * nplanes;
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uint8_t prev = *src_plane;
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src_plane += nplanes;
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for (; ; src_plane += nplanes) {
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if (src_plane < src_plane_end && *src_plane == prev && count < 0x3F) {
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// current byte is same as prev
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++count;
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} else {
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// output prev * count
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if (count != 1 || prev >= 0xC0)
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*dst++ = 0xC0 | count;
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*dst++ = prev;
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if (src_plane == src_plane_end)
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break;
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// start new run
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count = 1;
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prev = *src_plane;
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}
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}
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}
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return dst - dst_start;
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}
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static int pcx_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *frame, int *got_packet)
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{
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const uint8_t *buf_end;
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uint8_t *buf;
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int bpp, nplanes, i, y, line_bytes, written, ret, max_pkt_size, sw, sh;
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const uint32_t *pal = NULL;
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uint32_t palette256[256];
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const uint8_t *src;
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if (avctx->width > 65535 || avctx->height > 65535) {
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av_log(avctx, AV_LOG_ERROR, "image dimensions do not fit in 16 bits\n");
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return AVERROR(EINVAL);
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}
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switch (avctx->pix_fmt) {
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case AV_PIX_FMT_RGB24:
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bpp = 8;
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nplanes = 3;
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break;
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case AV_PIX_FMT_RGB8:
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case AV_PIX_FMT_BGR8:
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case AV_PIX_FMT_RGB4_BYTE:
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case AV_PIX_FMT_BGR4_BYTE:
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case AV_PIX_FMT_GRAY8:
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bpp = 8;
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nplanes = 1;
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avpriv_set_systematic_pal2(palette256, avctx->pix_fmt);
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pal = palette256;
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break;
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case AV_PIX_FMT_PAL8:
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bpp = 8;
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nplanes = 1;
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pal = (uint32_t *)frame->data[1];
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break;
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case AV_PIX_FMT_MONOBLACK:
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bpp = 1;
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nplanes = 1;
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pal = monoblack_pal;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "unsupported pixfmt\n");
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return AVERROR(EINVAL);
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}
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line_bytes = (avctx->width * bpp + 7) >> 3;
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line_bytes = (line_bytes + 1) & ~1;
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max_pkt_size = 128 + avctx->height * 2 * line_bytes * nplanes + (pal ? 256*3 + 1 : 0);
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if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size, 0)) < 0)
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return ret;
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buf = pkt->data;
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buf_end = pkt->data + pkt->size;
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sw = avctx->sample_aspect_ratio.num;
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sh = avctx->sample_aspect_ratio.den;
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if (sw > 0xFFFFu || sh > 0xFFFFu)
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av_reduce(&sw, &sh, sw, sh, 0xFFFFu);
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bytestream_put_byte(&buf, 10); // manufacturer
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bytestream_put_byte(&buf, 5); // version
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bytestream_put_byte(&buf, 1); // encoding
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bytestream_put_byte(&buf, bpp); // bits per pixel per plane
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bytestream_put_le16(&buf, 0); // x min
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bytestream_put_le16(&buf, 0); // y min
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bytestream_put_le16(&buf, avctx->width - 1); // x max
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bytestream_put_le16(&buf, avctx->height - 1); // y max
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bytestream_put_le16(&buf, sw); // horizontal DPI
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bytestream_put_le16(&buf, sh); // vertical DPI
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for (i = 0; i < 16; i++)
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bytestream_put_be24(&buf, pal ? pal[i] : 0);// palette (<= 16 color only)
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bytestream_put_byte(&buf, 0); // reserved
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bytestream_put_byte(&buf, nplanes); // number of planes
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bytestream_put_le16(&buf, line_bytes); // scanline plane size in bytes
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while (buf - pkt->data < 128)
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*buf++= 0;
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src = frame->data[0];
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for (y = 0; y < avctx->height; y++) {
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if ((written = pcx_rle_encode(buf, buf_end - buf,
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src, line_bytes, nplanes)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
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return AVERROR_BUG;
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}
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buf += written;
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src += frame->linesize[0];
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}
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if (nplanes == 1 && bpp == 8) {
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if (buf_end - buf < 257) {
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av_log(avctx, AV_LOG_ERROR, "buffer too small\n");
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return AVERROR_BUG;
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}
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bytestream_put_byte(&buf, 12);
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for (i = 0; i < 256; i++) {
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bytestream_put_be24(&buf, pal[i]);
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}
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}
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pkt->size = buf - pkt->data;
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pkt->flags |= AV_PKT_FLAG_KEY;
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*got_packet = 1;
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return 0;
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}
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AVCodec ff_pcx_encoder = {
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.name = "pcx",
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.long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_PCX,
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.init = pcx_encode_init,
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.encode2 = pcx_encode_frame,
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.pix_fmts = (const enum AVPixelFormat[]){
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AV_PIX_FMT_RGB24,
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AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE,
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AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
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AV_PIX_FMT_MONOBLACK,
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AV_PIX_FMT_NONE
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},
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};
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