mirror of
https://github.com/FFmpeg/FFmpeg.git
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113 lines
3.5 KiB
C
113 lines
3.5 KiB
C
/*
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* Alias PIX image encoder
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* Copyright (C) 2014 Vittorio Giovara <vittorio.giovara@gmail.com>
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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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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "encode.h"
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#define ALIAS_HEADER_SIZE 10
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static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *frame, int *got_packet)
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{
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int width, height, bits_pixel, length, ret;
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uint8_t *buf;
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width = avctx->width;
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height = avctx->height;
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if (width > 65535 || height > 65535 ||
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width * height >= INT_MAX / 4 - ALIAS_HEADER_SIZE) {
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av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n", width, height);
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return AVERROR_INVALIDDATA;
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}
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switch (avctx->pix_fmt) {
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case AV_PIX_FMT_GRAY8:
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bits_pixel = 8;
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break;
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case AV_PIX_FMT_BGR24:
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bits_pixel = 24;
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break;
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default:
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return AVERROR(EINVAL);
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}
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length = ALIAS_HEADER_SIZE + 4 * width * height; // max possible
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if ((ret = ff_alloc_packet(avctx, pkt, length)) < 0)
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return ret;
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buf = pkt->data;
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/* Encode header. */
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bytestream_put_be16(&buf, width);
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bytestream_put_be16(&buf, height);
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bytestream_put_be32(&buf, 0); /* X, Y offset */
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bytestream_put_be16(&buf, bits_pixel);
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for (int j = 0, bytes_pixel = bits_pixel >> 3; j < height; j++) {
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const uint8_t *in_buf = frame->data[0] + frame->linesize[0] * j;
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const uint8_t *const line_end = in_buf + bytes_pixel * width;
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while (in_buf < line_end) {
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int count = 0;
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int pixel;
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if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
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pixel = *in_buf;
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while (count < 255 && in_buf < line_end && pixel == *in_buf) {
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count++;
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in_buf++;
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}
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bytestream_put_byte(&buf, count);
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bytestream_put_byte(&buf, pixel);
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} else { /* AV_PIX_FMT_BGR24 */
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pixel = AV_RB24(in_buf);
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while (count < 255 && in_buf < line_end &&
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pixel == AV_RB24(in_buf)) {
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count++;
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in_buf += 3;
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}
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bytestream_put_byte(&buf, count);
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bytestream_put_be24(&buf, pixel);
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}
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}
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}
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/* Total length */
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av_shrink_packet(pkt, buf - pkt->data);
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*got_packet = 1;
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return 0;
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}
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const AVCodec ff_alias_pix_encoder = {
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.name = "alias_pix",
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.long_name = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_ALIAS_PIX,
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.encode2 = encode_frame,
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.pix_fmts = (const enum AVPixelFormat[]) {
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AV_PIX_FMT_BGR24, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
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},
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};
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