ffmpeg-2.1.1: move directory

git-svn-id: svn://kolibrios.org@6148 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.1/libavcodec/bethsoftvideo.c

@@ -0,0 +1,162 @@
+/*
+ * Bethesda VID video decoder
+ * Copyright (C) 2007 Nicholas Tung
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * @brief Bethesda Softworks VID Video Decoder
+ * @author Nicholas Tung [ntung (at. ntung com] (2007-03)
+ * @see http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
+ * @see http://www.svatopluk.com/andux/docs/dfvid.html
+ */
+
+#include "libavutil/common.h"
+#include "avcodec.h"
+#include "bethsoftvideo.h"
+#include "bytestream.h"
+#include "internal.h"
+
+typedef struct BethsoftvidContext {
+    AVFrame frame;
+    GetByteContext g;
+} BethsoftvidContext;
+
+static av_cold int bethsoftvid_decode_init(AVCodecContext *avctx)
+{
+    BethsoftvidContext *vid = avctx->priv_data;
+    avcodec_get_frame_defaults(&vid->frame);
+    avctx->pix_fmt = AV_PIX_FMT_PAL8;
+    return 0;
+}
+
+static int set_palette(BethsoftvidContext *ctx)
+{
+    uint32_t *palette = (uint32_t *)ctx->frame.data[1];
+    int a;
+
+    if (bytestream2_get_bytes_left(&ctx->g) < 256*3)
+        return AVERROR_INVALIDDATA;
+
+    for(a = 0; a < 256; a++){
+        palette[a] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->g) * 4;
+        palette[a] |= palette[a] >> 6 & 0x30303;
+    }
+    ctx->frame.palette_has_changed = 1;
+    return 0;
+}
+
+static int bethsoftvid_decode_frame(AVCodecContext *avctx,
+                              void *data, int *got_frame,
+                              AVPacket *avpkt)
+{
+    BethsoftvidContext * vid = avctx->priv_data;
+    char block_type;
+    uint8_t * dst;
+    uint8_t * frame_end;
+    int remaining = avctx->width;          // number of bytes remaining on a line
+    int wrap_to_next_line;
+    int code, ret;
+    int yoffset;
+
+    if ((ret = ff_reget_buffer(avctx, &vid->frame)) < 0)
+        return ret;
+    wrap_to_next_line = vid->frame.linesize[0] - avctx->width;
+
+    if (avpkt->side_data_elems > 0 &&
+        avpkt->side_data[0].type == AV_PKT_DATA_PALETTE) {
+        bytestream2_init(&vid->g, avpkt->side_data[0].data,
+                         avpkt->side_data[0].size);
+        if ((ret = set_palette(vid)) < 0)
+            return ret;
+    }
+
+    bytestream2_init(&vid->g, avpkt->data, avpkt->size);
+    dst = vid->frame.data[0];
+    frame_end = vid->frame.data[0] + vid->frame.linesize[0] * avctx->height;
+
+    switch(block_type = bytestream2_get_byte(&vid->g)){
+        case PALETTE_BLOCK: {
+            *got_frame = 0;
+            if ((ret = set_palette(vid)) < 0) {
+                av_log(avctx, AV_LOG_ERROR, "error reading palette\n");
+                return ret;
+            }
+            return bytestream2_tell(&vid->g);
+        }
+        case VIDEO_YOFF_P_FRAME:
+            yoffset = bytestream2_get_le16(&vid->g);
+            if(yoffset >= avctx->height)
+                return AVERROR_INVALIDDATA;
+            dst += vid->frame.linesize[0] * yoffset;
+    }
+
+    // main code
+    while((code = bytestream2_get_byte(&vid->g))){
+        int length = code & 0x7f;
+
+        // copy any bytes starting at the current position, and ending at the frame width
+        while(length > remaining){
+            if(code < 0x80)
+                bytestream2_get_buffer(&vid->g, dst, remaining);
+            else if(block_type == VIDEO_I_FRAME)
+                memset(dst, bytestream2_peek_byte(&vid->g), remaining);
+            length -= remaining;      // decrement the number of bytes to be copied
+            dst += remaining + wrap_to_next_line;    // skip over extra bytes at end of frame
+            remaining = avctx->width;
+            if(dst == frame_end)
+                goto end;
+        }
+
+        // copy any remaining bytes after / if line overflows
+        if(code < 0x80)
+            bytestream2_get_buffer(&vid->g, dst, length);
+        else if(block_type == VIDEO_I_FRAME)
+            memset(dst, bytestream2_get_byte(&vid->g), length);
+        remaining -= length;
+        dst += length;
+    }
+    end:
+
+    if ((ret = av_frame_ref(data, &vid->frame)) < 0)
+        return ret;
+
+    *got_frame = 1;
+
+    return avpkt->size;
+}
+
+static av_cold int bethsoftvid_decode_end(AVCodecContext *avctx)
+{
+    BethsoftvidContext * vid = avctx->priv_data;
+    av_frame_unref(&vid->frame);
+    return 0;
+}
+
+AVCodec ff_bethsoftvid_decoder = {
+    .name           = "bethsoftvid",
+    .long_name      = NULL_IF_CONFIG_SMALL("Bethesda VID video"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_BETHSOFTVID,
+    .priv_data_size = sizeof(BethsoftvidContext),
+    .init           = bethsoftvid_decode_init,
+    .close          = bethsoftvid_decode_end,
+    .decode         = bethsoftvid_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+};