Update ffmpeg to 7.1.1

submodules/ffmpeg/Sources/FFMpeg/ffmpeg-7.1.1/libavcodec/imx.c

@@ -0,0 +1,202 @@
+/*
+ * Copyright (c) 2021 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 "libavutil/common.h"
+#include "avcodec.h"
+#include "bytestream.h"
+#include "codec_internal.h"
+#include "decode.h"
+
+typedef struct SimbiosisIMXContext {
+    AVFrame *frame;
+    uint32_t pal[256];
+    uint8_t history[32768];
+    int pos;
+} SimbiosisIMXContext;
+
+static av_cold int imx_decode_init(AVCodecContext *avctx)
+{
+    SimbiosisIMXContext *imx = avctx->priv_data;
+
+    avctx->pix_fmt = AV_PIX_FMT_PAL8;
+    avctx->width   = 320;
+    avctx->height  = 160;
+
+    imx->frame = av_frame_alloc();
+    if (!imx->frame)
+        return AVERROR(ENOMEM);
+
+    return 0;
+}
+
+static int imx_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
+                            int *got_frame, AVPacket *avpkt)
+{
+    SimbiosisIMXContext *imx = avctx->priv_data;
+    int ret, x, y;
+    AVFrame *frame = imx->frame;
+    GetByteContext gb;
+
+    if ((ret = ff_reget_buffer(avctx, frame, 0)) < 0)
+        return ret;
+
+    if (ff_copy_palette(imx->pal, avpkt, avctx)) {
+#if FF_API_PALETTE_HAS_CHANGED
+FF_DISABLE_DEPRECATION_WARNINGS
+        frame->palette_has_changed = 1;
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+        frame->flags |= AV_FRAME_FLAG_KEY;
+    } else {
+        frame->flags &= ~AV_FRAME_FLAG_KEY;
+#if FF_API_PALETTE_HAS_CHANGED
+FF_DISABLE_DEPRECATION_WARNINGS
+        frame->palette_has_changed = 0;
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
+    }
+
+    bytestream2_init(&gb, avpkt->data, avpkt->size);
+
+    memcpy(frame->data[1], imx->pal, AVPALETTE_SIZE);
+
+    x = 0, y = 0;
+    while (bytestream2_get_bytes_left(&gb) > 0 &&
+           x < 320 && y < 160) {
+        int b = bytestream2_get_byte(&gb);
+        int len = b & 0x3f;
+        int op = b >> 6;
+        int fill;
+
+        switch (op) {
+        case 3:
+            len = len * 64 + bytestream2_get_byte(&gb);
+        case 0:
+            while (len > 0) {
+                x++;
+                len--;
+                if (x >= 320) {
+                    x = 0;
+                    y++;
+                }
+                if (y >= 160)
+                    break;
+            }
+
+            frame->flags &= ~AV_FRAME_FLAG_KEY;
+            break;
+        case 1:
+            if (len == 0) {
+                int offset = bytestream2_get_le16(&gb);
+
+                if (offset < 0 || offset >= 32768)
+                    return AVERROR_INVALIDDATA;
+
+                len = bytestream2_get_byte(&gb);
+                while (len > 0 && offset < 32768) {
+                    frame->data[0][x + y * frame->linesize[0]] = imx->history[offset++];
+                    x++;
+                    len--;
+                    if (x >= 320) {
+                        x = 0;
+                        y++;
+                    }
+                    if (y >= 160)
+                        break;
+                }
+
+                frame->flags &= ~AV_FRAME_FLAG_KEY;
+            } else {
+                while (len > 0) {
+                    fill = bytestream2_get_byte(&gb);
+                    frame->data[0][x + y * frame->linesize[0]] = fill;
+                    if (imx->pos < 32768)
+                        imx->history[imx->pos++] = fill;
+                    x++;
+                    len--;
+                    if (x >= 320) {
+                        x = 0;
+                        y++;
+                    }
+                    if (y >= 160)
+                        break;
+                }
+            }
+            break;
+        case 2:
+            fill = bytestream2_get_byte(&gb);
+
+            while (len > 0) {
+                frame->data[0][x + y * frame->linesize[0]] = fill;
+                x++;
+                len--;
+                if (x >= 320) {
+                    x = 0;
+                    y++;
+                }
+                if (y >= 160)
+                    break;
+            }
+            break;
+        }
+    }
+
+    frame->pict_type = (frame->flags & AV_FRAME_FLAG_KEY) ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
+
+    if ((ret = av_frame_ref(rframe, frame)) < 0)
+        return ret;
+
+    *got_frame = 1;
+
+    return avpkt->size;
+}
+
+static void imx_decode_flush(AVCodecContext *avctx)
+{
+    SimbiosisIMXContext *imx = avctx->priv_data;
+
+    av_frame_unref(imx->frame);
+    imx->pos = 0;
+    memset(imx->pal, 0, sizeof(imx->pal));
+    memset(imx->history, 0, sizeof(imx->history));
+}
+
+static int imx_decode_close(AVCodecContext *avctx)
+{
+    SimbiosisIMXContext *imx = avctx->priv_data;
+
+    av_frame_free(&imx->frame);
+
+    return 0;
+}
+
+const FFCodec ff_simbiosis_imx_decoder = {
+    .p.name         = "simbiosis_imx",
+    CODEC_LONG_NAME("Simbiosis Interactive IMX Video"),
+    .p.type         = AVMEDIA_TYPE_VIDEO,
+    .p.id           = AV_CODEC_ID_SIMBIOSIS_IMX,
+    .priv_data_size = sizeof(SimbiosisIMXContext),
+    .init           = imx_decode_init,
+    FF_CODEC_DECODE_CB(imx_decode_frame),
+    .close          = imx_decode_close,
+    .flush          = imx_decode_flush,
+    .p.capabilities = AV_CODEC_CAP_DR1,
+    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
+};