/* * Alias PIX image encoder * Copyright (C) 2014 Vittorio Giovara <vittorio.giovara@gmail.com> * * 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 */ #include "libavutil/intreadwrite.h" #include "avcodec.h"#include "bytestream.h"#include "internal.h" #define ALIAS_HEADER_SIZE 10 static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,                        const AVFrame *frame, int *got_packet){    int width, height, bits_pixel, i, j, length, ret;    uint8_t *in_buf, *buf; #if FF_API_CODED_FRAMEFF_DISABLE_DEPRECATION_WARNINGS    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;    avctx->coded_frame->key_frame = 1;FF_ENABLE_DEPRECATION_WARNINGS#endif     width  = avctx->width;    height = avctx->height;     if (width > 65535 || height > 65535 ||        width * height >= INT_MAX / 4 - ALIAS_HEADER_SIZE) {        av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n", width, height);        return AVERROR_INVALIDDATA;    }     switch (avctx->pix_fmt) {    case AV_PIX_FMT_GRAY8:        bits_pixel = 8;        break;    case AV_PIX_FMT_BGR24:        bits_pixel = 24;        break;    default:        return AVERROR(EINVAL);    }     length = ALIAS_HEADER_SIZE + 4 * width * height; // max possible    if ((ret = ff_alloc_packet2(avctx, pkt, length, ALIAS_HEADER_SIZE + height*2)) < 0) {        av_log(avctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", length);        return ret;    }     buf = pkt->data;     /* Encode header. */    bytestream_put_be16(&buf, width);    bytestream_put_be16(&buf, height);    bytestream_put_be32(&buf, 0); /* X, Y offset */    bytestream_put_be16(&buf, bits_pixel);     for (j = 0; j < height; j++) {        in_buf = frame->data[0] + frame->linesize[0] * j;        for (i = 0; i < width; ) {            int count = 0;            int pixel;             if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {                pixel = *in_buf;                while (count < 255 && count + i < width && pixel == *in_buf) {                    count++;                    in_buf++;                }                bytestream_put_byte(&buf, count);                bytestream_put_byte(&buf, pixel);            } else { /* AV_PIX_FMT_BGR24 */                pixel = AV_RB24(in_buf);                while (count < 255 && count + i < width &&                       pixel == AV_RB24(in_buf)) {                    count++;                    in_buf += 3;                }                bytestream_put_byte(&buf, count);                bytestream_put_be24(&buf, pixel);            }            i += count;        }    }     /* Total length */    av_shrink_packet(pkt, buf - pkt->data);    pkt->flags |= AV_PKT_FLAG_KEY;    *got_packet = 1;     return 0;} AVCodec ff_alias_pix_encoder = {    .name      = "alias_pix",    .long_name = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"),    .type      = AVMEDIA_TYPE_VIDEO,    .id        = AV_CODEC_ID_ALIAS_PIX,    .encode2   = encode_frame,    .pix_fmts  = (const enum AVPixelFormat[]) {        AV_PIX_FMT_BGR24, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE    },};