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/msrle.c

@@ -0,0 +1,164 @@
+/*
+ * Microsoft RLE video decoder
+ * Copyright (C) 2003 the ffmpeg project
+ *
+ * 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
+ * MS RLE video decoder by Mike Melanson (melanson@pcisys.net)
+ * For more information about the MS RLE format, visit:
+ *   http://www.pcisys.net/~melanson/codecs/
+ *
+ * The MS RLE decoder outputs PAL8 colorspace data.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "avcodec.h"
+#include "internal.h"
+#include "msrledec.h"
+
+typedef struct MsrleContext {
+    AVCodecContext *avctx;
+    AVFrame frame;
+
+    GetByteContext gb;
+    const unsigned char *buf;
+    int size;
+
+    uint32_t pal[256];
+} MsrleContext;
+
+static av_cold int msrle_decode_init(AVCodecContext *avctx)
+{
+    MsrleContext *s = avctx->priv_data;
+    int i;
+
+    s->avctx = avctx;
+
+    switch (avctx->bits_per_coded_sample) {
+    case 1:
+        avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
+        break;
+    case 4:
+    case 8:
+        avctx->pix_fmt = AV_PIX_FMT_PAL8;
+        break;
+    case 24:
+        avctx->pix_fmt = AV_PIX_FMT_BGR24;
+        break;
+    default:
+        av_log(avctx, AV_LOG_ERROR, "unsupported bits per sample\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    avcodec_get_frame_defaults(&s->frame);
+
+    if (avctx->extradata_size >= 4)
+        for (i = 0; i < FFMIN(avctx->extradata_size, AVPALETTE_SIZE)/4; i++)
+            s->pal[i] = 0xFFU<<24 | AV_RL32(avctx->extradata+4*i);
+
+    return 0;
+}
+
+static int msrle_decode_frame(AVCodecContext *avctx,
+                              void *data, int *got_frame,
+                              AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    MsrleContext *s = avctx->priv_data;
+    int istride = FFALIGN(avctx->width*avctx->bits_per_coded_sample, 32) / 8;
+    int ret;
+
+    s->buf = buf;
+    s->size = buf_size;
+
+    if ((ret = ff_reget_buffer(avctx, &s->frame)) < 0)
+        return ret;
+
+    if (avctx->bits_per_coded_sample > 1 && avctx->bits_per_coded_sample <= 8) {
+        const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
+
+        if (pal) {
+            s->frame.palette_has_changed = 1;
+            memcpy(s->pal, pal, AVPALETTE_SIZE);
+        }
+        /* make the palette available */
+        memcpy(s->frame.data[1], s->pal, AVPALETTE_SIZE);
+    }
+
+    /* FIXME how to correctly detect RLE ??? */
+    if (avctx->height * istride == avpkt->size) { /* assume uncompressed */
+        int linesize = (avctx->width * avctx->bits_per_coded_sample + 7) / 8;
+        uint8_t *ptr = s->frame.data[0];
+        uint8_t *buf = avpkt->data + (avctx->height-1)*istride;
+        int i, j;
+
+        for (i = 0; i < avctx->height; i++) {
+            if (avctx->bits_per_coded_sample == 4) {
+                for (j = 0; j < avctx->width - 1; j += 2) {
+                    ptr[j+0] = buf[j>>1] >> 4;
+                    ptr[j+1] = buf[j>>1] & 0xF;
+                }
+                if (avctx->width & 1)
+                    ptr[j+0] = buf[j>>1] >> 4;
+            } else {
+                memcpy(ptr, buf, linesize);
+            }
+            buf -= istride;
+            ptr += s->frame.linesize[0];
+        }
+    } else {
+        bytestream2_init(&s->gb, buf, buf_size);
+        ff_msrle_decode(avctx, (AVPicture*)&s->frame, avctx->bits_per_coded_sample, &s->gb);
+    }
+
+    if ((ret = av_frame_ref(data, &s->frame)) < 0)
+        return ret;
+
+    *got_frame      = 1;
+
+    /* report that the buffer was completely consumed */
+    return buf_size;
+}
+
+static av_cold int msrle_decode_end(AVCodecContext *avctx)
+{
+    MsrleContext *s = avctx->priv_data;
+
+    /* release the last frame */
+    av_frame_unref(&s->frame);
+
+    return 0;
+}
+
+AVCodec ff_msrle_decoder = {
+    .name           = "msrle",
+    .long_name      = NULL_IF_CONFIG_SMALL("Microsoft RLE"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_MSRLE,
+    .priv_data_size = sizeof(MsrleContext),
+    .init           = msrle_decode_init,
+    .close          = msrle_decode_end,
+    .decode         = msrle_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+};