avformat: add image2 alias pix demuxer

Reviewed-by: wm4 <nfxjfg@googlemail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/Makefile

@@ -182,6 +182,7 @@ OBJS-$(CONFIG_IMAGE2_DEMUXER)            += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE2_MUXER)              += img2enc.o img2.o
 OBJS-$(CONFIG_IMAGE2PIPE_DEMUXER)        += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE2PIPE_MUXER)          += img2enc.o img2.o
+OBJS-$(CONFIG_IMAGE2_ALIAS_PIX_DEMUXER)  += img2_alias_pix.o
 OBJS-$(CONFIG_INGENIENT_DEMUXER)         += ingenientdec.o rawdec.o
 OBJS-$(CONFIG_IPMOVIE_DEMUXER)           += ipmovie.o
 OBJS-$(CONFIG_IRCAM_DEMUXER)             += ircamdec.o ircam.o pcm.o

libavformat/allformats.c

@@ -146,6 +146,7 @@ void av_register_all(void)
     REGISTER_MUXDEMUX(ILBC,             ilbc);
     REGISTER_MUXDEMUX(IMAGE2,           image2);
     REGISTER_MUXDEMUX(IMAGE2PIPE,       image2pipe);
+    REGISTER_DEMUXER (IMAGE2_ALIAS_PIX, image2_alias_pix);
     REGISTER_DEMUXER (INGENIENT,        ingenient);
     REGISTER_DEMUXER (IPMOVIE,          ipmovie);
     REGISTER_MUXER   (IPOD,             ipod);

libavformat/img2_alias_pix.c

+/*
+ * Alias PIX image demuxer
+ * Copyright (c) 2014 Michael Niedermayer
+ *
+ * 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
+ */
+
+#include "img2.h"
+#include "libavutil/intreadwrite.h"
+
+static int brender_read_probe(AVProbeData *p)
+{
+    int width  = AV_RB16(p->buf);
+    int height = AV_RB16(p->buf+2);
+    int ox     = AV_RB16(p->buf+4);
+    int oy     = AV_RB16(p->buf+6);
+    int bpp    = AV_RB16(p->buf+8);
+    int count  = p->buf[10];
+
+    if (!count || !height || count > width)
+        return 0;
+
+    if (bpp != 24 && bpp != 8)
+        return 0;
+
+    return AVPROBE_SCORE_EXTENSION + 1;
+}
+
+AVInputFormat ff_image2_alias_pix_demuxer = {
+    .name           = "alias_pix",
+    .long_name      = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"),
+    .priv_data_size = sizeof(VideoDemuxData),
+    .read_probe     = brender_read_probe,
+    .read_header    = ff_img_read_header,
+    .read_packet    = ff_img_read_packet,
+    .raw_codec_id   = AV_CODEC_ID_ALIAS_PIX,
+};