matroskadec: simplify matroska_ebmlnum_sint()

[ffmpeg] / libavcodec / msrle.c

diff --git a/libavcodec/msrle.c b/libavcodec/msrle.c
index f7819cb951f507fb81a16c6511fdef3344a3a585..ceffae8bb0cd702c9c4bf6feb7d98c7af87a22aa 100644 (file)
--- a/libavcodec/msrle.c
+++ b/libavcodec/msrle.c
@@ -2,19 +2,21 @@
  * Micrsoft RLE Video Decoder
  * Copyright (C) 2003 the ffmpeg project
  *
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
  *
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
@@ -34,16 +36,14 @@
 #include <string.h>
 #include <unistd.h>
 
-#include "common.h"
 #include "avcodec.h"
 #include "dsputil.h"
 
 typedef struct MsrleContext {
     AVCodecContext *avctx;
     AVFrame frame;
-    AVFrame prev_frame;
 
-    unsigned char *buf;
+    const unsigned char *buf;
     int size;
 
 } MsrleContext;
@@ -111,8 +111,8 @@ static void msrle_decode_pal4(MsrleContext *s)
                 FETCH_NEXT_STREAM_BYTE();
                 s->frame.data[0][row_ptr + pixel_ptr] = stream_byte >> 4;
                 pixel_ptr++;
-             if (i + 1 == rle_code && odd_pixel)
-                       break;
+                if (i + 1 == rle_code && odd_pixel)
+                    break;
                 if (pixel_ptr >= s->avctx->width)
                     break;
                 s->frame.data[0][row_ptr + pixel_ptr] = stream_byte & 0x0F;
@@ -236,53 +236,34 @@ static void msrle_decode_pal8(MsrleContext *s)
             stream_ptr, s->size);
 }
 
-static int msrle_decode_init(AVCodecContext *avctx)
+static av_cold int msrle_decode_init(AVCodecContext *avctx)
 {
-    MsrleContext *s = (MsrleContext *)avctx->priv_data;
+    MsrleContext *s = avctx->priv_data;
 
     s->avctx = avctx;
 
     avctx->pix_fmt = PIX_FMT_PAL8;
-    avctx->has_b_frames = 0;
-    s->frame.data[0] = s->prev_frame.data[0] = NULL;
+    s->frame.data[0] = NULL;
 
     return 0;
 }
 
 static int msrle_decode_frame(AVCodecContext *avctx,
                               void *data, int *data_size,
-                              uint8_t *buf, int buf_size)
+                              const uint8_t *buf, int buf_size)
 {
-    MsrleContext *s = (MsrleContext *)avctx->priv_data;
-
-       /* no supplementary picture */
-       if (buf_size == 0)
-               return 0;
+    MsrleContext *s = avctx->priv_data;
 
     s->buf = buf;
     s->size = buf_size;
 
     s->frame.reference = 1;
-    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE;
-    if (avctx->cr_available)
-        s->frame.buffer_hints |= FF_BUFFER_HINTS_REUSABLE;
-    else
-        s->frame.buffer_hints |= FF_BUFFER_HINTS_READABLE;
-    if (avctx->get_buffer(avctx, &s->frame)) {
-        av_log(avctx, AV_LOG_ERROR, "  MS RLE: get_buffer() failed\n");
+    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
+    if (avctx->reget_buffer(avctx, &s->frame)) {
+        av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
         return -1;
     }
 
-    if (s->prev_frame.data[0] && (s->frame.linesize[0] != s->prev_frame.linesize[0]))
-        av_log(avctx, AV_LOG_ERROR, "  MS RLE: Buffer linesize changed: current %u, previous %u.\n"
-                "          Expect wrong image and/or crash!\n",
-                s->frame.linesize[0], s->prev_frame.linesize[0]);
-
-    /* grossly inefficient, but...oh well */
-    if (s->prev_frame.data[0] != NULL)
-       memcpy(s->frame.data[0], s->prev_frame.data[0], 
-        s->frame.linesize[0] * s->avctx->height);
-
     switch (avctx->bits_per_sample) {
         case 8:
             msrle_decode_pal8(s);
@@ -295,13 +276,6 @@ static int msrle_decode_frame(AVCodecContext *avctx,
                    avctx->bits_per_sample);
     }
 
-    if (s->prev_frame.data[0])
-        avctx->release_buffer(avctx, &s->prev_frame);
-
-    /* shuffle frames */
-  if (!avctx->cr_available)
-    s->prev_frame = s->frame;
-
     *data_size = sizeof(AVFrame);
     *(AVFrame*)data = s->frame;
 
@@ -309,13 +283,13 @@ static int msrle_decode_frame(AVCodecContext *avctx,
     return buf_size;
 }
 
-static int msrle_decode_end(AVCodecContext *avctx)
+static av_cold int msrle_decode_end(AVCodecContext *avctx)
 {
-    MsrleContext *s = (MsrleContext *)avctx->priv_data;
+    MsrleContext *s = avctx->priv_data;
 
     /* release the last frame */
-    if (s->prev_frame.data[0])
-        avctx->release_buffer(avctx, &s->prev_frame);
+    if (s->frame.data[0])
+        avctx->release_buffer(avctx, &s->frame);
 
     return 0;
 }
@@ -329,5 +303,6 @@ AVCodec msrle_decoder = {
     NULL,
     msrle_decode_end,
     msrle_decode_frame,
-    CODEC_CAP_DR1 | CODEC_CAP_CR,
+    CODEC_CAP_DR1,
+    .long_name= NULL_IF_CONFIG_SMALL("Microsoft RLE"),
 };