avcodec: add QOI decoder and demuxer and parser and encoder and muxer

1 files changed, 140 insertions, 0 deletions

diff --git a/libavcodec/qoienc.c b/libavcodec/qoienc.c
new file mode 100644
index 0000000000..bd137674a4
--- /dev/null
+++ b/libavcodec/qoienc.c
@@ -0,0 +1,140 @@
+/*
+ * 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, *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",
+    .p.long_name    = NULL_IF_CONFIG_SMALL("QOI (Quite OK Image format) image"),
+    .p.type         = AVMEDIA_TYPE_VIDEO,
+    .p.id           = AV_CODEC_ID_QOI,
+    .p.capabilities = AV_CODEC_CAP_FRAME_THREADS,
+    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
+    },
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
+};