mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
225 lines
6.9 KiB
225 lines
6.9 KiB
/* |
|
* 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" |
|
|
|
typedef struct PCXContext { |
|
AVFrame picture; |
|
} PCXContext; |
|
|
|
static const uint32_t monoblack_pal[16] = { 0x000000, 0xFFFFFF }; |
|
|
|
static av_cold int pcx_encode_init(AVCodecContext *avctx) |
|
{ |
|
PCXContext *s = avctx->priv_data; |
|
|
|
avcodec_get_frame_defaults(&s->picture); |
|
avctx->coded_frame = &s->picture; |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* 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) |
|
{ |
|
PCXContext *s = avctx->priv_data; |
|
AVFrame *const pict = &s->picture; |
|
const uint8_t *buf_end; |
|
uint8_t *buf; |
|
|
|
int bpp, nplanes, i, y, line_bytes, written, ret, max_pkt_size; |
|
const uint32_t *pal = NULL; |
|
uint32_t palette256[256]; |
|
const uint8_t *src; |
|
|
|
*pict = *frame; |
|
pict->pict_type = AV_PICTURE_TYPE_I; |
|
pict->key_frame = 1; |
|
|
|
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; |
|
ff_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; |
|
|
|
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; |
|
|
|
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, 0); // horizontal DPI |
|
bytestream_put_le16(&buf, 0); // 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]); |
|
} |
|
} |
|
|
|
pkt->size = buf - pkt->data; |
|
pkt->flags |= AV_PKT_FLAG_KEY; |
|
*got_packet = 1; |
|
|
|
return 0; |
|
} |
|
|
|
AVCodec ff_pcx_encoder = { |
|
.name = "pcx", |
|
.type = AVMEDIA_TYPE_VIDEO, |
|
.id = AV_CODEC_ID_PCX, |
|
.priv_data_size = sizeof(PCXContext), |
|
.init = pcx_encode_init, |
|
.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 |
|
}, |
|
.long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"), |
|
};
|
|
|