mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-12 19:18:44 +02:00
135 lines
4.0 KiB
C
135 lines
4.0 KiB
C
/*
|
|
* Alias PIX image encoder
|
|
* Copyright (C) 2014 Vittorio Giovara <vittorio.giovara@gmail.com>
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; 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
|
|
},
|
|
};
|