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This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. 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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FF_CODEC_ENCODE_CB(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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