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122 lines
3.9 KiB
122 lines
3.9 KiB
/* |
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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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const uint8_t *buf = avpkt->data; |
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int ret, buf_size = avpkt->size; |
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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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if (buf_size < 20) |
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return AVERROR_INVALIDDATA; |
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bytestream2_init(&gb, buf, buf_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 ((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 buf_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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FF_CODEC_DECODE_CB(qoi_decode_frame), |
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};
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