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a247ac640d
Given that the AVCodec.next pointer has now been removed, most of the AVCodecs are not modified at all any more and can therefore be made const (as this patch does); the only exceptions are the very few codecs for external libraries that have a init_static_data callback. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
116 lines
3.6 KiB
C
116 lines
3.6 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 "internal.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, i, j, length, ret;
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uint8_t *in_buf, *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_packet2(avctx, pkt, length, ALIAS_HEADER_SIZE + height*2)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", length);
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return ret;
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}
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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 (j = 0; j < height; j++) {
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in_buf = frame->data[0] + frame->linesize[0] * j;
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for (i = 0; i < width; ) {
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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 && count + i < width && 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 && count + i < width &&
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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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i += count;
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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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pkt->flags |= AV_PKT_FLAG_KEY;
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*got_packet = 1;
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return 0;
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}
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const AVCodec ff_alias_pix_encoder = {
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.name = "alias_pix",
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.long_name = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_ALIAS_PIX,
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.encode2 = encode_frame,
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.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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