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-rw-r--r--libavcodec/arbc.c212
1 files changed, 212 insertions, 0 deletions
diff --git a/libavcodec/arbc.c b/libavcodec/arbc.c
new file mode 100644
index 0000000000..4558304f12
--- /dev/null
+++ b/libavcodec/arbc.c
@@ -0,0 +1,212 @@
+/*
+ * Gryphon's Anim Compressor decoder
+ * Copyright (c) 2019 Paul B Mahol
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libavutil/imgutils.h"
+#include "libavutil/internal.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/mem.h"
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+
+typedef struct ARBCContext {
+ GetByteContext gb;
+
+ AVFrame *prev_frame;
+} ARBCContext;
+
+static void fill_tile4(AVCodecContext *avctx, uint8_t *color, AVFrame *frame)
+{
+ ARBCContext *s = avctx->priv_data;
+ GetByteContext *gb = &s->gb;
+ int nb_tiles = bytestream2_get_le16(gb);
+ int h = avctx->height - 1;
+
+ for (int i = 0; i < nb_tiles; i++) {
+ int y = bytestream2_get_byte(gb);
+ int x = bytestream2_get_byte(gb);
+ uint16_t mask = bytestream2_get_le16(gb);
+ int start_y = y * 4, start_x = x * 4;
+ int end_y = start_y + 4, end_x = start_x + 4;
+
+ for (int j = start_y; j < end_y; j++) {
+ for (int k = start_x; k < end_x; k++) {
+ if (mask & 0x8000) {
+ if (j >= avctx->height || k >= avctx->width) {
+ mask = mask << 1;
+ continue;
+ }
+ frame->data[0][frame->linesize[0] * (h - j) + 3 * k + 0] = color[0];
+ frame->data[0][frame->linesize[0] * (h - j) + 3 * k + 1] = color[1];
+ frame->data[0][frame->linesize[0] * (h - j) + 3 * k + 2] = color[2];
+ }
+ mask = mask << 1;
+ }
+ }
+ }
+}
+
+static void fill_tileX(AVCodecContext *avctx, int tile_width, int tile_height,
+ uint8_t *color, AVFrame *frame)
+{
+ ARBCContext *s = avctx->priv_data;
+ GetByteContext *gb = &s->gb;
+ const int step_h = tile_height / 4;
+ const int step_w = tile_width / 4;
+ int nb_tiles = bytestream2_get_le16(gb);
+ int h = avctx->height - 1;
+
+ for (int i = 0; i < nb_tiles; i++) {
+ int y = bytestream2_get_byte(gb);
+ int x = bytestream2_get_byte(gb);
+ uint16_t mask = bytestream2_get_le16(gb);
+ int start_y = y * tile_height, start_x = x * tile_width;
+ int end_y = start_y + tile_height, end_x = start_x + tile_width;
+
+ for (int j = start_y; j < end_y; j += step_h) {
+ for (int k = start_x; k < end_x; k += step_w) {
+ if (mask & 0x8000U) {
+ for (int m = 0; m < step_h; m++) {
+ for (int n = 0; n < step_w; n++) {
+ if (j + m >= avctx->height || k + n >= avctx->width)
+ continue;
+ frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n) + 0] = color[0];
+ frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n) + 1] = color[1];
+ frame->data[0][frame->linesize[0] * (h - (j + m)) + 3 * (k + n) + 2] = color[2];
+ }
+ }
+ }
+ mask = mask << 1;
+ }
+ }
+ }
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame, AVPacket *avpkt)
+{
+ ARBCContext *s = avctx->priv_data;
+ AVFrame *frame = data;
+ int ret, nb_segments, keyframe = 1;
+
+ if (avpkt->size < 10)
+ return AVERROR_INVALIDDATA;
+
+ if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
+ return ret;
+
+ if (s->prev_frame->data[0]) {
+ ret = av_frame_copy(frame, s->prev_frame);
+ if (ret < 0)
+ return ret;
+ }
+
+ bytestream2_init(&s->gb, avpkt->data, avpkt->size);
+ bytestream2_skip(&s->gb, 8);
+ nb_segments = bytestream2_get_le16(&s->gb);
+ if (nb_segments == 0)
+ keyframe = 0;
+
+ for (int i = 0; i < nb_segments; i++) {
+ int resolution_flag;
+ uint8_t fill[3];
+
+ if (bytestream2_get_bytes_left(&s->gb) <= 0)
+ return AVERROR_INVALIDDATA;
+
+ fill[0] = bytestream2_get_byte(&s->gb);
+ bytestream2_skip(&s->gb, 1);
+ fill[1] = bytestream2_get_byte(&s->gb);
+ bytestream2_skip(&s->gb, 1);
+ fill[2] = bytestream2_get_byte(&s->gb);
+ bytestream2_skip(&s->gb, 1);
+ resolution_flag = bytestream2_get_byte(&s->gb);
+
+ if (resolution_flag & 0x10)
+ fill_tileX(avctx, 1024, 1024, fill, frame);
+ if (resolution_flag & 0x08)
+ fill_tileX(avctx, 256, 256, fill, frame);
+ if (resolution_flag & 0x04)
+ fill_tileX(avctx, 64, 64, fill, frame);
+ if (resolution_flag & 0x02)
+ fill_tileX(avctx, 16, 16, fill, frame);
+ if (resolution_flag & 0x01)
+ fill_tile4(avctx, fill, frame);
+ }
+
+ av_frame_unref(s->prev_frame);
+ if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
+ return ret;
+
+ frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
+ frame->key_frame = keyframe;
+ *got_frame = 1;
+
+ return avpkt->size;
+}
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+ ARBCContext *s = avctx->priv_data;
+
+ avctx->pix_fmt = AV_PIX_FMT_RGB24;
+
+ s->prev_frame = av_frame_alloc();
+ if (!s->prev_frame)
+ return AVERROR(ENOMEM);
+
+ return 0;
+}
+
+static void decode_flush(AVCodecContext *avctx)
+{
+ ARBCContext *s = avctx->priv_data;
+
+ av_frame_unref(s->prev_frame);
+}
+
+static av_cold int decode_close(AVCodecContext *avctx)
+{
+ ARBCContext *s = avctx->priv_data;
+
+ av_frame_free(&s->prev_frame);
+
+ return 0;
+}
+
+AVCodec ff_arbc_decoder = {
+ .name = "arbc",
+ .long_name = NULL_IF_CONFIG_SMALL("Gryphon's Anim Compressor"),
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_ARBC,
+ .priv_data_size = sizeof(ARBCContext),
+ .init = decode_init,
+ .decode = decode_frame,
+ .flush = decode_flush,
+ .close = decode_close,
+ .capabilities = AV_CODEC_CAP_DR1,
+ .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
+};
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