mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
142 lines
4.9 KiB
C
142 lines
4.9 KiB
C
/*
|
|
* QOI image format encoder
|
|
*
|
|
* 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/imgutils.h"
|
|
#include "avcodec.h"
|
|
#include "bytestream.h"
|
|
#include "codec_internal.h"
|
|
#include "encode.h"
|
|
#include "qoi.h"
|
|
|
|
static int qoi_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
|
|
const AVFrame *pict, int *got_packet)
|
|
{
|
|
const int channels = 3 + (avctx->pix_fmt == AV_PIX_FMT_RGBA);
|
|
uint8_t px_prev[4] = { 0, 0, 0, 255 };
|
|
uint8_t px[4] = { 0, 0, 0, 255 };
|
|
uint8_t index[64][4] = { 0 };
|
|
int64_t packet_size;
|
|
uint8_t *buf;
|
|
const uint8_t *src;
|
|
int ret, run = 0;
|
|
|
|
packet_size = avctx->width * avctx->height * (channels + 1LL) + 14LL + 8LL;
|
|
if ((ret = ff_alloc_packet(avctx, pkt, packet_size)) < 0)
|
|
return ret;
|
|
|
|
buf = pkt->data;
|
|
src = pict->data[0];
|
|
|
|
bytestream_put_buffer(&buf, "qoif", 4);
|
|
bytestream_put_be32(&buf, avctx->width);
|
|
bytestream_put_be32(&buf, avctx->height);
|
|
bytestream_put_byte(&buf, channels);
|
|
bytestream_put_byte(&buf, avctx->color_trc == AVCOL_TRC_LINEAR);
|
|
|
|
for (int y = 0; y < avctx->height; y++) {
|
|
for (int x = 0; x < avctx->width; x++) {
|
|
memcpy(px, src + x * channels, channels);
|
|
|
|
if (!memcmp(px, px_prev, 4)) {
|
|
run++;
|
|
if (run == 62) {
|
|
bytestream_put_byte(&buf, QOI_OP_RUN | (run - 1));
|
|
run = 0;
|
|
}
|
|
} else {
|
|
int index_pos;
|
|
|
|
if (run > 0) {
|
|
bytestream_put_byte(&buf, QOI_OP_RUN | (run - 1));
|
|
run = 0;
|
|
}
|
|
|
|
index_pos = QOI_COLOR_HASH(px) & 63;
|
|
|
|
if (!memcmp(index[index_pos], px, 4)) {
|
|
bytestream_put_byte(&buf, QOI_OP_INDEX | index_pos);
|
|
} else {
|
|
memcpy(index[index_pos], px, 4);
|
|
|
|
if (px[3] == px_prev[3]) {
|
|
int8_t vr = px[0] - px_prev[0];
|
|
int8_t vg = px[1] - px_prev[1];
|
|
int8_t vb = px[2] - px_prev[2];
|
|
|
|
int8_t vg_r = vr - vg;
|
|
int8_t vg_b = vb - vg;
|
|
|
|
if (vr > -3 && vr < 2 &&
|
|
vg > -3 && vg < 2 &&
|
|
vb > -3 && vb < 2) {
|
|
bytestream_put_byte(&buf, QOI_OP_DIFF | (vr + 2) << 4 | (vg + 2) << 2 | (vb + 2));
|
|
} else if (vg_r > -9 && vg_r < 8 &&
|
|
vg > -33 && vg < 32 &&
|
|
vg_b > -9 && vg_b < 8) {
|
|
bytestream_put_byte(&buf, QOI_OP_LUMA | (vg + 32));
|
|
bytestream_put_byte(&buf, (vg_r + 8) << 4 | (vg_b + 8));
|
|
} else {
|
|
bytestream_put_byte(&buf, QOI_OP_RGB);
|
|
bytestream_put_byte(&buf, px[0]);
|
|
bytestream_put_byte(&buf, px[1]);
|
|
bytestream_put_byte(&buf, px[2]);
|
|
}
|
|
} else {
|
|
bytestream_put_byte(&buf, QOI_OP_RGBA);
|
|
bytestream_put_byte(&buf, px[0]);
|
|
bytestream_put_byte(&buf, px[1]);
|
|
bytestream_put_byte(&buf, px[2]);
|
|
bytestream_put_byte(&buf, px[3]);
|
|
}
|
|
}
|
|
}
|
|
|
|
memcpy(px_prev, px, 4);
|
|
}
|
|
|
|
src += pict->linesize[0];
|
|
}
|
|
|
|
if (run)
|
|
bytestream_put_byte(&buf, QOI_OP_RUN | (run - 1));
|
|
|
|
bytestream_put_be64(&buf, 0x01);
|
|
|
|
pkt->size = buf - pkt->data;
|
|
|
|
*got_packet = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
const FFCodec ff_qoi_encoder = {
|
|
.p.name = "qoi",
|
|
CODEC_LONG_NAME("QOI (Quite OK Image format) image"),
|
|
.p.type = AVMEDIA_TYPE_VIDEO,
|
|
.p.id = AV_CODEC_ID_QOI,
|
|
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |
|
|
AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE,
|
|
FF_CODEC_ENCODE_CB(qoi_encode_frame),
|
|
.p.pix_fmts = (const enum AVPixelFormat[]){
|
|
AV_PIX_FMT_RGBA, AV_PIX_FMT_RGB24,
|
|
AV_PIX_FMT_NONE
|
|
},
|
|
};
|