/* * 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 av_cold int encode_init(AVCodecContext *avctx) { avctx->coded_frame = av_frame_alloc(); if (!avctx->coded_frame) return AVERROR(ENOMEM); return 0; } 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; avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I; avctx->coded_frame->key_frame = 1; 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(pkt, length)) < 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; } static av_cold int encode_close(AVCodecContext *avctx) { av_frame_free(&avctx->coded_frame); 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, .init = encode_init, .encode2 = encode_frame, .close = encode_close, .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_BGR24, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE }, };