/* * 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 "codec_internal.h"#include "encode.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, length, ret;    uint8_t *buf;     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_packet(avctx, pkt, length)) < 0)        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 (int j = 0, bytes_pixel = bits_pixel >> 3; j < height; j++) {        const uint8_t *in_buf = frame->data[0] + frame->linesize[0] * j;        const uint8_t *const line_end = in_buf + bytes_pixel * width;        while (in_buf < line_end) {            int count = 0;            int pixel;             if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {                pixel = *in_buf;                while (count < 255 && in_buf < line_end && 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 && in_buf < line_end &&                       pixel == AV_RB24(in_buf)) {                    count++;                    in_buf += 3;                }                bytestream_put_byte(&buf, count);                bytestream_put_be24(&buf, pixel);            }        }    }     /* Total length */    av_shrink_packet(pkt, buf - pkt->data);    *got_packet = 1;     return 0;} const FFCodec ff_alias_pix_encoder = {    .p.name    = "alias_pix",    CODEC_LONG_NAME("Alias/Wavefront PIX image"),    .p.type    = AVMEDIA_TYPE_VIDEO,    .p.id      = AV_CODEC_ID_ALIAS_PIX,    .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,    FF_CODEC_ENCODE_CB(encode_frame),    .p.pix_fmts = (const enum AVPixelFormat[]) {        AV_PIX_FMT_BGR24, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE    },};