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