| /* |
| * 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://bespin.org/~qz/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 }; |
| |
| static av_cold int pcx_encode_init(AVCodecContext *avctx) |
| { |
| #if FF_API_CODED_FRAME |
| FF_DISABLE_DEPRECATION_WARNINGS |
| avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I; |
| avctx->coded_frame->key_frame = 1; |
| FF_ENABLE_DEPRECATION_WARNINGS |
| #endif |
| |
| 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 AVERROR(EINVAL); |
| |
| 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) |
| { |
| 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; |
| |
| if (avctx->width > 65535 || avctx->height > 65535) { |
| av_log(avctx, AV_LOG_ERROR, "image dimensions do not fit in 16 bits\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| 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 *)frame->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 AVERROR(EINVAL); |
| } |
| |
| 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)) < 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 = frame->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 AVERROR_BUG; |
| } |
| buf += written; |
| src += frame->linesize[0]; |
| } |
| |
| if (nplanes == 1 && bpp == 8) { |
| if (buf_end - buf < 257) { |
| av_log(avctx, AV_LOG_ERROR, "buffer too small\n"); |
| return AVERROR_BUG; |
| } |
| 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", |
| .long_name = NULL_IF_CONFIG_SMALL("PC Paintbrush PCX image"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_PCX, |
| .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 |
| }, |
| }; |