rmenc: Drop the temporary buffer for ac3 byteswap

Use direcly avio_w8().

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

libavformat/rmenc.c

@@ -355,31 +355,23 @@ static int rm_write_header(AVFormatContext *s)
 
 static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags)
 {
-    uint8_t *buf1;
     RMMuxContext *rm = s->priv_data;
     AVIOContext *pb = s->pb;
     StreamInfo *stream = rm->audio_stream;
     int i;
 
-    /* XXX: suppress this malloc */
-    buf1 = av_malloc(size * sizeof(uint8_t));
-    if (!buf1)
-        return AVERROR(ENOMEM);
-
     write_packet_header(s, stream, size, !!(flags & AV_PKT_FLAG_KEY));
 
     if (stream->enc->codec_id == AV_CODEC_ID_AC3) {
         /* for AC-3, the words seem to be reversed */
         for (i = 0; i < size; i += 2) {
-            buf1[i] = buf[i+1];
-            buf1[i+1] = buf[i];
+            avio_w8(pb, buf[i + 1]);
+            avio_w8(pb, buf[i]);
         }
-        avio_write(pb, buf1, size);
     } else {
         avio_write(pb, buf, size);
     }
     stream->nb_frames++;
-    av_free(buf1);
     return 0;
 }