0,0 → 1,212 |
/* |
* PC Paintbrush PCX (.pcx) image encoder |
* Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu> |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
/** |
* @file |
* PCX image encoder |
* @author Daniel Verkamp |
* @see http://www.qzx.com/pc-gpe/pcx.txt |
*/ |
|
#include "avcodec.h" |
#include "bytestream.h" |
#include "libavutil/imgutils.h" |
#include "internal.h" |
|
static const uint32_t monoblack_pal[16] = { 0x000000, 0xFFFFFF }; |
|
/** |
* PCX run-length encoder |
* @param dst output buffer |
* @param dst_size size of output buffer |
* @param src input buffer |
* @param src_plane_size size of one plane of input buffer in bytes |
* @param nplanes number of planes in input buffer |
* @return number of bytes written to dst or -1 on error |
* @bug will not work for nplanes != 1 && bpp != 8 |
*/ |
static int pcx_rle_encode( uint8_t *dst, int dst_size, |
const uint8_t *src, int src_plane_size, int nplanes) |
{ |
int p; |
const uint8_t *dst_start = dst; |
|
// check worst-case upper bound on dst_size |
if (dst_size < 2LL * src_plane_size * nplanes || src_plane_size <= 0) |
return -1; |
|
for (p = 0; p < nplanes; p++) { |
int count = 1; |
const uint8_t *src_plane = src + p; |
const uint8_t *src_plane_end = src_plane + src_plane_size * nplanes; |
uint8_t prev = *src_plane; |
src_plane += nplanes; |
|
for (; ; src_plane += nplanes) { |
if (src_plane < src_plane_end && *src_plane == prev && count < 0x3F) { |
// current byte is same as prev |
++count; |
} else { |
// output prev * count |
if (count != 1 || prev >= 0xC0) |
*dst++ = 0xC0 | count; |
*dst++ = prev; |
|
if (src_plane == src_plane_end) |
break; |
|
// start new run |
count = 1; |
prev = *src_plane; |
} |
} |
} |
|
return dst - dst_start; |
} |
|
static int pcx_encode_frame(AVCodecContext *avctx, AVPacket *pkt, |
const AVFrame *frame, int *got_packet) |
{ |
AVFrame *const pict = (AVFrame *) frame; |
const uint8_t *buf_end; |
uint8_t *buf; |
|
int bpp, nplanes, i, y, line_bytes, written, ret, max_pkt_size, sw, sh; |
const uint32_t *pal = NULL; |
uint32_t palette256[256]; |
const uint8_t *src; |
|
pict->pict_type = AV_PICTURE_TYPE_I; |
pict->key_frame = 1; |
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if (avctx->width > 65535 || avctx->height > 65535) { |
av_log(avctx, AV_LOG_ERROR, "image dimensions do not fit in 16 bits\n"); |
return -1; |
} |
|
switch (avctx->pix_fmt) { |
case AV_PIX_FMT_RGB24: |
bpp = 8; |
nplanes = 3; |
break; |
case AV_PIX_FMT_RGB8: |
case AV_PIX_FMT_BGR8: |
case AV_PIX_FMT_RGB4_BYTE: |
case AV_PIX_FMT_BGR4_BYTE: |
case AV_PIX_FMT_GRAY8: |
bpp = 8; |
nplanes = 1; |
avpriv_set_systematic_pal2(palette256, avctx->pix_fmt); |
pal = palette256; |
break; |
case AV_PIX_FMT_PAL8: |
bpp = 8; |
nplanes = 1; |
pal = (uint32_t *)pict->data[1]; |
break; |
case AV_PIX_FMT_MONOBLACK: |
bpp = 1; |
nplanes = 1; |
pal = monoblack_pal; |
break; |
default: |
av_log(avctx, AV_LOG_ERROR, "unsupported pixfmt\n"); |
return -1; |
} |
|
line_bytes = (avctx->width * bpp + 7) >> 3; |
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); |
if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size)) < 0) |
return ret; |
buf = pkt->data; |
buf_end = pkt->data + pkt->size; |
|
sw = avctx->sample_aspect_ratio.num; |
sh = avctx->sample_aspect_ratio.den; |
if (sw > 0xFFFFu || sh > 0xFFFFu) |
av_reduce(&sw, &sh, sw, sh, 0xFFFFu); |
|
bytestream_put_byte(&buf, 10); // manufacturer |
bytestream_put_byte(&buf, 5); // version |
bytestream_put_byte(&buf, 1); // encoding |
bytestream_put_byte(&buf, bpp); // bits per pixel per plane |
bytestream_put_le16(&buf, 0); // x min |
bytestream_put_le16(&buf, 0); // y min |
bytestream_put_le16(&buf, avctx->width - 1); // x max |
bytestream_put_le16(&buf, avctx->height - 1); // y max |
bytestream_put_le16(&buf, sw); // horizontal DPI |
bytestream_put_le16(&buf, sh); // vertical DPI |
for (i = 0; i < 16; i++) |
bytestream_put_be24(&buf, pal ? pal[i] : 0);// palette (<= 16 color only) |
bytestream_put_byte(&buf, 0); // reserved |
bytestream_put_byte(&buf, nplanes); // number of planes |
bytestream_put_le16(&buf, line_bytes); // scanline plane size in bytes |
|
while (buf - pkt->data < 128) |
*buf++= 0; |
|
src = pict->data[0]; |
|
for (y = 0; y < avctx->height; y++) { |
if ((written = pcx_rle_encode(buf, buf_end - buf, |
src, line_bytes, nplanes)) < 0) { |
av_log(avctx, AV_LOG_ERROR, "buffer too small\n"); |
return -1; |
} |
buf += written; |
src += pict->linesize[0]; |
} |
|
if (nplanes == 1 && bpp == 8) { |
if (buf_end - buf < 257) { |
av_log(avctx, AV_LOG_ERROR, "buffer too small\n"); |
return -1; |
} |
bytestream_put_byte(&buf, 12); |
for (i = 0; i < 256; i++) { |
bytestream_put_be24(&buf, pal[i]); |
} |
} |
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pkt->size = buf - pkt->data; |
pkt->flags |= AV_PKT_FLAG_KEY; |
*got_packet = 1; |
|
return 0; |
} |
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AVCodec ff_pcx_encoder = { |
.name = "pcx", |
.long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"), |
.type = AVMEDIA_TYPE_VIDEO, |
.id = AV_CODEC_ID_PCX, |
.encode2 = pcx_encode_frame, |
.pix_fmts = (const enum AVPixelFormat[]){ |
AV_PIX_FMT_RGB24, |
AV_PIX_FMT_RGB8, AV_PIX_FMT_BGR8, AV_PIX_FMT_RGB4_BYTE, AV_PIX_FMT_BGR4_BYTE, |
AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8, |
AV_PIX_FMT_MONOBLACK, |
AV_PIX_FMT_NONE |
}, |
}; |