Windows Televison (WTV) demuxer

[ffmpeg] / libavcodec / aasc.c

diff --git a/libavcodec/aasc.c b/libavcodec/aasc.c
index 8f26fae87d8694714b141987cc810be3e786d565..82bd2bfd3d8cc40c4dbc4c0058d43a8aba2828bf 100644 (file)
--- a/libavcodec/aasc.c
+++ b/libavcodec/aasc.c
@@ -1,5 +1,5 @@
 /*
- * Autodesc RLE Decoder
+ * Autodesk RLE Decoder
  * Copyright (C) 2005 the ffmpeg project
  *
  * This file is part of FFmpeg.
@@ -20,17 +20,17 @@
  */
 
 /**
- * @file aasc.c
- * Autodesc RLE Video Decoder by Konstantin Shishkov
+ * @file
+ * Autodesk RLE Video Decoder by Konstantin Shishkov
  */
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
-#include "common.h"
 #include "avcodec.h"
 #include "dsputil.h"
+#include "msrledec.h"
 
 typedef struct AascContext {
     AVCodecContext *avctx;
@@ -45,30 +45,25 @@ typedef struct AascContext {
     } \
     stream_byte = buf[stream_ptr++];
 
-static int aasc_decode_init(AVCodecContext *avctx)
+static av_cold int aasc_decode_init(AVCodecContext *avctx)
 {
-    AascContext *s = (AascContext *)avctx->priv_data;
+    AascContext *s = avctx->priv_data;
 
     s->avctx = avctx;
 
     avctx->pix_fmt = PIX_FMT_BGR24;
-    s->frame.data[0] = NULL;
 
     return 0;
 }
 
 static int aasc_decode_frame(AVCodecContext *avctx,
                               void *data, int *data_size,
-                              uint8_t *buf, int buf_size)
+                              AVPacket *avpkt)
 {
-    AascContext *s = (AascContext *)avctx->priv_data;
-    int stream_ptr = 4;
-    unsigned char rle_code;
-    unsigned char stream_byte;
-    int pixel_ptr = 0;
-    int row_dec, row_ptr;
-    int frame_size;
-    int i;
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    AascContext *s = avctx->priv_data;
+    int compr, i, stride;
 
     s->frame.reference = 1;
     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
@@ -77,73 +72,25 @@ static int aasc_decode_frame(AVCodecContext *avctx,
         return -1;
     }
 
-    row_dec = s->frame.linesize[0];
-    row_ptr = (s->avctx->height - 1) * row_dec;
-    frame_size = row_dec * s->avctx->height;
-
-    while (row_ptr >= 0) {
-        FETCH_NEXT_STREAM_BYTE();
-        rle_code = stream_byte;
-        if (rle_code == 0) {
-            /* fetch the next byte to see how to handle escape code */
-            FETCH_NEXT_STREAM_BYTE();
-            if (stream_byte == 0) {
-                /* line is done, goto the next one */
-                row_ptr -= row_dec;
-                pixel_ptr = 0;
-            } else if (stream_byte == 1) {
-                /* decode is done */
-                break;
-            } else if (stream_byte == 2) {
-                /* reposition frame decode coordinates */
-                FETCH_NEXT_STREAM_BYTE();
-                pixel_ptr += stream_byte;
-                FETCH_NEXT_STREAM_BYTE();
-                row_ptr -= stream_byte * row_dec;
-            } else {
-                /* copy pixels from encoded stream */
-                if ((pixel_ptr + stream_byte > avctx->width * 3) ||
-                    (row_ptr < 0)) {
-                    av_log(s->avctx, AV_LOG_ERROR, " AASC: frame ptr just went out of bounds (copy1)\n");
-                    break;
-                }
-
-                rle_code = stream_byte;
-                if (stream_ptr + rle_code > buf_size) {
-                    av_log(s->avctx, AV_LOG_ERROR, " AASC: stream ptr just went out of bounds (copy2)\n");
-                    break;
-                }
-
-                for (i = 0; i < rle_code; i++) {
-                    FETCH_NEXT_STREAM_BYTE();
-                    s->frame.data[0][row_ptr + pixel_ptr] = stream_byte;
-                    pixel_ptr++;
-                }
-                if (rle_code & 1)
-                    stream_ptr++;
-            }
-        } else {
-            /* decode a run of data */
-            if ((pixel_ptr + rle_code > avctx->width * 3) ||
-                (row_ptr < 0)) {
-                av_log(s->avctx, AV_LOG_ERROR, " AASC: frame ptr just went out of bounds (run1)\n");
-                break;
-            }
-
-            FETCH_NEXT_STREAM_BYTE();
-
-            while(rle_code--) {
-                s->frame.data[0][row_ptr + pixel_ptr] = stream_byte;
-                pixel_ptr++;
-            }
+    compr = AV_RL32(buf);
+    buf += 4;
+    buf_size -= 4;
+    switch(compr){
+    case 0:
+        stride = (avctx->width * 3 + 3) & ~3;
+        for(i = avctx->height - 1; i >= 0; i--){
+            memcpy(s->frame.data[0] + i*s->frame.linesize[0], buf, avctx->width*3);
+            buf += stride;
         }
+        break;
+    case 1:
+        ff_msrle_decode(avctx, (AVPicture*)&s->frame, 8, buf - 4, buf_size + 4);
+        break;
+    default:
+        av_log(avctx, AV_LOG_ERROR, "Unknown compression type %d\n", compr);
+        return -1;
     }
 
-    /* one last sanity check on the way out */
-    if (stream_ptr < buf_size)
-        av_log(s->avctx, AV_LOG_ERROR, " AASC: ended frame decode with bytes left over (%d < %d)\n",
-            stream_ptr, buf_size);
-
     *data_size = sizeof(AVFrame);
     *(AVFrame*)data = s->frame;
 
@@ -151,9 +98,9 @@ static int aasc_decode_frame(AVCodecContext *avctx,
     return buf_size;
 }
 
-static int aasc_decode_end(AVCodecContext *avctx)
+static av_cold int aasc_decode_end(AVCodecContext *avctx)
 {
-    AascContext *s = (AascContext *)avctx->priv_data;
+    AascContext *s = avctx->priv_data;
 
     /* release the last frame */
     if (s->frame.data[0])
@@ -164,7 +111,7 @@ static int aasc_decode_end(AVCodecContext *avctx)
 
 AVCodec aasc_decoder = {
     "aasc",
-    CODEC_TYPE_VIDEO,
+    AVMEDIA_TYPE_VIDEO,
     CODEC_ID_AASC,
     sizeof(AascContext),
     aasc_decode_init,
@@ -172,4 +119,5 @@ AVCodec aasc_decoder = {
     aasc_decode_end,
     aasc_decode_frame,
     CODEC_CAP_DR1,
+    .long_name = NULL_IF_CONFIG_SMALL("Autodesk RLE"),
 };