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https://github.com/FFmpeg/FFmpeg.git
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126 lines
4.0 KiB
C
126 lines
4.0 KiB
C
/*
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* QOI image format
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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 "avcodec.h"
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#include "bytestream.h"
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#include "codec_internal.h"
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#include "decode.h"
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#include "thread.h"
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#include "qoi.h"
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static int qoi_decode_frame(AVCodecContext *avctx, AVFrame *p,
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int *got_frame, AVPacket *avpkt)
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{
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int width, height, channels, space, run = 0;
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uint8_t index[64][4] = { 0 };
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uint8_t px[4] = { 0, 0, 0, 255 };
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GetByteContext gb;
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uint8_t *dst;
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uint64_t len;
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int ret;
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if (avpkt->size < 20)
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return AVERROR_INVALIDDATA;
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bytestream2_init(&gb, avpkt->data, avpkt->size);
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bytestream2_skip(&gb, 4);
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width = bytestream2_get_be32(&gb);
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height = bytestream2_get_be32(&gb);
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channels = bytestream2_get_byte(&gb);
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space = bytestream2_get_byte(&gb);
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switch (space) {
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case 0: break;
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case 1: avctx->color_trc = AVCOL_TRC_LINEAR; break;
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default: return AVERROR_INVALIDDATA;
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}
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if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
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return ret;
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switch (channels) {
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case 3: avctx->pix_fmt = AV_PIX_FMT_RGB24; break;
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case 4: avctx->pix_fmt = AV_PIX_FMT_RGBA; break;
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default: return AVERROR_INVALIDDATA;
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}
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if (avctx->skip_frame >= AVDISCARD_ALL)
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return avpkt->size;
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if ((ret = ff_thread_get_buffer(avctx, p, 0)) < 0)
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return ret;
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dst = p->data[0];
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len = width * height * channels;
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for (int n = 0, off_x = 0; n < len; n += channels, off_x++) {
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if (off_x >= width) {
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off_x = 0;
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dst += p->linesize[0];
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}
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if (run > 0) {
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run--;
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} else if (bytestream2_get_bytes_left(&gb) > 4) {
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int chunk = bytestream2_get_byteu(&gb);
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if (chunk == QOI_OP_RGB) {
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bytestream2_get_bufferu(&gb, px, 3);
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} else if (chunk == QOI_OP_RGBA) {
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bytestream2_get_bufferu(&gb, px, 4);
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} else if ((chunk & QOI_MASK_2) == QOI_OP_INDEX) {
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memcpy(px, index[chunk], 4);
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} else if ((chunk & QOI_MASK_2) == QOI_OP_DIFF) {
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px[0] += ((chunk >> 4) & 0x03) - 2;
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px[1] += ((chunk >> 2) & 0x03) - 2;
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px[2] += ( chunk & 0x03) - 2;
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} else if ((chunk & QOI_MASK_2) == QOI_OP_LUMA) {
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int b2 = bytestream2_get_byteu(&gb);
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int vg = (chunk & 0x3f) - 32;
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px[0] += vg - 8 + ((b2 >> 4) & 0x0f);
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px[1] += vg;
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px[2] += vg - 8 + (b2 & 0x0f);
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} else if ((chunk & QOI_MASK_2) == QOI_OP_RUN) {
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run = chunk & 0x3f;
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}
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memcpy(index[QOI_COLOR_HASH(px) & 63], px, 4);
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} else {
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break;
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}
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memcpy(&dst[off_x * channels], px, channels);
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}
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p->key_frame = 1;
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p->pict_type = AV_PICTURE_TYPE_I;
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*got_frame = 1;
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return avpkt->size;
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}
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const FFCodec ff_qoi_decoder = {
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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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.caps_internal = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
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FF_CODEC_DECODE_CB(qoi_decode_frame),
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};
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