ffmpeg-2.8.5

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

contrib/sdk/sources/ffmpeg/ffmpeg-2.8/libavcodec/sp5xdec.c

@@ -0,0 +1,126 @@
+/*
+ * Sunplus JPEG decoder (SP5X)
+ * Copyright (c) 2003 Alex Beregszaszi
+ *
+ * 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
+ * Sunplus JPEG decoder (SP5X).
+ */
+
+#include "avcodec.h"
+#include "internal.h"
+#include "mjpeg.h"
+#include "mjpegdec.h"
+#include "sp5x.h"
+
+
+static int sp5x_decode_frame(AVCodecContext *avctx,
+                              void *data, int *got_frame,
+                              AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    AVPacket avpkt_recoded;
+    const int qscale = 5;
+    uint8_t *recoded;
+    int i = 0, j = 0;
+
+    if (!avctx->width || !avctx->height)
+        return -1;
+
+    recoded = av_mallocz(buf_size + 1024);
+    if (!recoded)
+        return -1;
+
+    /* SOI */
+    recoded[j++] = 0xFF;
+    recoded[j++] = 0xD8;
+
+    memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
+    memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64);
+    memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64);
+    j += sizeof(sp5x_data_dqt);
+
+    memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
+    j += sizeof(sp5x_data_dht);
+
+    memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
+    AV_WB16(recoded+j+5, avctx->coded_height);
+    AV_WB16(recoded+j+7, avctx->coded_width);
+    j += sizeof(sp5x_data_sof);
+
+    memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
+    j += sizeof(sp5x_data_sos);
+
+    if(avctx->codec_id==AV_CODEC_ID_AMV)
+        for (i = 2; i < buf_size-2 && j < buf_size+1024-2; i++)
+            recoded[j++] = buf[i];
+    else
+    for (i = 14; i < buf_size && j < buf_size+1024-3; i++)
+    {
+        recoded[j++] = buf[i];
+        if (buf[i] == 0xff)
+            recoded[j++] = 0;
+    }
+
+    /* EOI */
+    recoded[j++] = 0xFF;
+    recoded[j++] = 0xD9;
+
+    av_init_packet(&avpkt_recoded);
+    avpkt_recoded.data = recoded;
+    avpkt_recoded.size = j;
+    i = ff_mjpeg_decode_frame(avctx, data, got_frame, &avpkt_recoded);
+
+    av_free(recoded);
+
+    return i < 0 ? i : avpkt->size;
+}
+
+#if CONFIG_SP5X_DECODER
+AVCodec ff_sp5x_decoder = {
+    .name           = "sp5x",
+    .long_name      = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_SP5X,
+    .priv_data_size = sizeof(MJpegDecodeContext),
+    .init           = ff_mjpeg_decode_init,
+    .close          = ff_mjpeg_decode_end,
+    .decode         = sp5x_decode_frame,
+    .capabilities   = AV_CODEC_CAP_DR1,
+    .max_lowres     = 3,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
+};
+#endif
+#if CONFIG_AMV_DECODER
+AVCodec ff_amv_decoder = {
+    .name           = "amv",
+    .long_name      = NULL_IF_CONFIG_SMALL("AMV Video"),
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_AMV,
+    .priv_data_size = sizeof(MJpegDecodeContext),
+    .init           = ff_mjpeg_decode_init,
+    .close          = ff_mjpeg_decode_end,
+    .decode         = sp5x_decode_frame,
+    .max_lowres     = 3,
+    .capabilities   = AV_CODEC_CAP_DR1,
+    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
+};
+#endif