ffmpeg-2.8.5

git-svn-id: svn://kolibrios.org@6147 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.8/libavcodec/cyuv.c

@@ -0,0 +1,202 @@
+/*
+ * Creative YUV (CYUV) Video Decoder
+ *   by Mike Melanson (melanson@pcisys.net)
+ * based on "Creative YUV (CYUV) stream format for AVI":
+ *   http://www.csse.monash.edu.au/~timf/videocodec/cyuv.txt
+ *
+ * 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
+ * Creative YUV (CYUV) Video Decoder.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "avcodec.h"
+#include "internal.h"
+#include "libavutil/internal.h"
+
+
+typedef struct CyuvDecodeContext {
+    AVCodecContext *avctx;
+    int width, height;
+} CyuvDecodeContext;
+
+static av_cold int cyuv_decode_init(AVCodecContext *avctx)
+{
+    CyuvDecodeContext *s = avctx->priv_data;
+
+    s->avctx = avctx;
+    s->width = avctx->width;
+    /* width needs to be divisible by 4 for this codec to work */
+    if (s->width & 0x3)
+        return AVERROR_INVALIDDATA;
+    s->height = avctx->height;
+
+    return 0;
+}
+
+static int cyuv_decode_frame(AVCodecContext *avctx,
+                             void *data, int *got_frame,
+                             AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    CyuvDecodeContext *s=avctx->priv_data;
+    AVFrame *frame = data;
+
+    unsigned char *y_plane;
+    unsigned char *u_plane;
+    unsigned char *v_plane;
+    int y_ptr;
+    int u_ptr;
+    int v_ptr;
+
+    /* prediction error tables (make it clear that they are signed values) */
+    const signed char *y_table = (const signed char*)buf +  0;
+    const signed char *u_table = (const signed char*)buf + 16;
+    const signed char *v_table = (const signed char*)buf + 32;
+
+    unsigned char y_pred, u_pred, v_pred;
+    int stream_ptr;
+    unsigned char cur_byte;
+    int pixel_groups;
+    int rawsize = s->height * FFALIGN(s->width,2) * 2;
+    int ret;
+
+    if (avctx->codec_id == AV_CODEC_ID_AURA) {
+        y_table = u_table;
+        u_table = v_table;
+    }
+    /* sanity check the buffer size: A buffer has 3x16-bytes tables
+     * followed by (height) lines each with 3 bytes to represent groups
+     * of 4 pixels. Thus, the total size of the buffer ought to be:
+     *    (3 * 16) + height * (width * 3 / 4) */
+    if (buf_size == 48 + s->height * (s->width * 3 / 4)) {
+        avctx->pix_fmt = AV_PIX_FMT_YUV411P;
+    } else if(buf_size == rawsize ) {
+        avctx->pix_fmt = AV_PIX_FMT_UYVY422;
+    } else {
+        av_log(avctx, AV_LOG_ERROR, "got a buffer with %d bytes when %d were expected\n",
+               buf_size, 48 + s->height * (s->width * 3 / 4));
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* pixel data starts 48 bytes in, after 3x16-byte tables */
+    stream_ptr = 48;
+
+    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+        return ret;
+
+    y_plane = frame->data[0];
+    u_plane = frame->data[1];
+    v_plane = frame->data[2];
+
+    if (buf_size == rawsize) {
+        int linesize = FFALIGN(s->width,2) * 2;
+        y_plane += frame->linesize[0] * s->height;
+        for (stream_ptr = 0; stream_ptr < rawsize; stream_ptr += linesize) {
+            y_plane -= frame->linesize[0];
+            memcpy(y_plane, buf+stream_ptr, linesize);
+        }
+    } else {
+
+    /* iterate through each line in the height */
+    for (y_ptr = 0, u_ptr = 0, v_ptr = 0;
+         y_ptr < (s->height * frame->linesize[0]);
+         y_ptr += frame->linesize[0] - s->width,
+         u_ptr += frame->linesize[1] - s->width / 4,
+         v_ptr += frame->linesize[2] - s->width / 4) {
+
+        /* reset predictors */
+        cur_byte = buf[stream_ptr++];
+        u_plane[u_ptr++] = u_pred = cur_byte & 0xF0;
+        y_plane[y_ptr++] = y_pred = (cur_byte & 0x0F) << 4;
+
+        cur_byte = buf[stream_ptr++];
+        v_plane[v_ptr++] = v_pred = cur_byte & 0xF0;
+        y_pred += y_table[cur_byte & 0x0F];
+        y_plane[y_ptr++] = y_pred;
+
+        cur_byte = buf[stream_ptr++];
+        y_pred += y_table[cur_byte & 0x0F];
+        y_plane[y_ptr++] = y_pred;
+        y_pred += y_table[(cur_byte & 0xF0) >> 4];
+        y_plane[y_ptr++] = y_pred;
+
+        /* iterate through the remaining pixel groups (4 pixels/group) */
+        pixel_groups = s->width / 4 - 1;
+        while (pixel_groups--) {
+
+            cur_byte = buf[stream_ptr++];
+            u_pred += u_table[(cur_byte & 0xF0) >> 4];
+            u_plane[u_ptr++] = u_pred;
+            y_pred += y_table[cur_byte & 0x0F];
+            y_plane[y_ptr++] = y_pred;
+
+            cur_byte = buf[stream_ptr++];
+            v_pred += v_table[(cur_byte & 0xF0) >> 4];
+            v_plane[v_ptr++] = v_pred;
+            y_pred += y_table[cur_byte & 0x0F];
+            y_plane[y_ptr++] = y_pred;
+
+            cur_byte = buf[stream_ptr++];
+            y_pred += y_table[cur_byte & 0x0F];
+            y_plane[y_ptr++] = y_pred;
+            y_pred += y_table[(cur_byte & 0xF0) >> 4];
+            y_plane[y_ptr++] = y_pred;
+
+        }
+    }
+    }
+
+    *got_frame = 1;
+
+    return buf_size;
+}
+
+#if CONFIG_AURA_DECODER
+AVCodec ff_aura_decoder = {
+    .name           = "aura",
+    .long_name      = NULL_IF_CONFIG_SMALL("Auravision AURA"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_AURA,
+    .priv_data_size = sizeof(CyuvDecodeContext),
+    .init           = cyuv_decode_init,
+    .decode         = cyuv_decode_frame,
+    .capabilities   = AV_CODEC_CAP_DR1,
+};
+#endif
+
+#if CONFIG_CYUV_DECODER
+AVCodec ff_cyuv_decoder = {
+    .name           = "cyuv",
+    .long_name      = NULL_IF_CONFIG_SMALL("Creative YUV (CYUV)"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_CYUV,
+    .priv_data_size = sizeof(CyuvDecodeContext),
+    .init           = cyuv_decode_init,
+    .decode         = cyuv_decode_frame,
+    .capabilities   = AV_CODEC_CAP_DR1,
+};
+#endif