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20f9727018
Up until now, codec.h contains both public and private parts of AVCodec. This exposes the internals of AVCodec to users and leads them into the temptation of actually using them and forces us to forward-declare structures and types that users can't use at all. This commit changes this by adding a new structure FFCodec to codec_internal.h that extends AVCodec, i.e. contains the public AVCodec as first member; the private fields of AVCodec are moved to this structure, leaving codec.h clean. Reviewed-by: Anton Khirnov <anton@khirnov.net> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
114 lines
3.5 KiB
C
114 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 "codec_internal.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 FFCodec ff_alias_pix_encoder = {
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.p.name = "alias_pix",
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.p.long_name = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"),
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_ALIAS_PIX,
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.encode2 = encode_frame,
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.p.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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