change gif demuxer to gif decoder

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@6760 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

Changelog

@@ -64,6 +64,7 @@ version <next>
 - Tiertex .seq demuxer/video decoder
 - MTV demuxer
 - TIFF picture decoder
+- GIF picture decoder
 
 version 0.4.9-pre1:
 

MAINTAINERS

@@ -121,6 +121,7 @@ Codecs:
   flashsv.c                             Benjamin Larsson
   flicvideo.c                           Mike Melanson
   g726.c                                Roman Shaposhnik
+  gifdec.c                              Baptiste Coudurier
   h264*                                 Loren Merritt, Michael Niedermayer
   h261*                                 Michael Niedermayer
   h263*                                 Michael Niedermayer

libavcodec/Makefile

@@ -84,6 +84,7 @@ OBJS-$(CONFIG_FLASHSV_DECODER)         += flashsv.o
 OBJS-$(CONFIG_FLIC_DECODER)            += flicvideo.o
 OBJS-$(CONFIG_FOURXM_DECODER)          += 4xm.o
 OBJS-$(CONFIG_FRAPS_DECODER)           += fraps.o
+OBJS-$(CONFIG_GIF_DECODER)             += gifdec.o
 OBJS-$(CONFIG_H261_DECODER)            += h261.o
 OBJS-$(CONFIG_H261_ENCODER)            += h261.o
 OBJS-$(CONFIG_H264_DECODER)            += h264.o

libavcodec/allcodecs.c

@@ -193,6 +193,9 @@ void avcodec_register_all(void)
 #endif //CONFIG_RAWVIDEO_ENCODER
 
     /* decoders */
+#ifdef CONFIG_GIF_DECODER
+    register_avcodec(&gif_decoder);
+#endif
 #ifdef CONFIG_H263_DECODER
     register_avcodec(&h263_decoder);
 #endif //CONFIG_H263_DECODER

libavcodec/avcodec.h

@@ -37,8 +37,8 @@ extern "C" {
 #define AV_STRINGIFY(s)         AV_TOSTRING(s)
 #define AV_TOSTRING(s) #s
 
-#define LIBAVCODEC_VERSION_INT  ((51<<16)+(20<<8)+0)
-#define LIBAVCODEC_VERSION      51.20.0
+#define LIBAVCODEC_VERSION_INT  ((51<<16)+(21<<8)+0)
+#define LIBAVCODEC_VERSION      51.21.0
 #define LIBAVCODEC_BUILD        LIBAVCODEC_VERSION_INT
 
 #define LIBAVCODEC_IDENT        "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
@@ -148,6 +148,7 @@ enum CodecID {
     CODEC_ID_DSICINVIDEO,
     CODEC_ID_TIERTEXSEQVIDEO,
     CODEC_ID_TIFF,
+    CODEC_ID_GIF,
 
     /* various pcm "codecs" */
     CODEC_ID_PCM_S16LE= 0x10000,
@@ -2177,6 +2178,7 @@ extern AVCodec sonic_ls_encoder;
 extern AVCodec svq1_encoder;
 extern AVCodec x264_encoder;
 
+extern AVCodec gif_decoder;
 extern AVCodec h263_decoder;
 extern AVCodec h261_decoder;
 extern AVCodec mpeg4_decoder;

libavcodec/bytestream.h

+/*
+ * Bytestream functions
+ * copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
+ *
+ * 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
+ */
+
+#ifndef FFMPEG_BYTESTREAM_H
+#define FFMPEG_BYTESTREAM_H
+
+static always_inline unsigned int bytestream_get_le32(uint8_t **b)
+{
+    (*b) += 4;
+    return LE_32(*b - 4);
+}
+
+static always_inline unsigned int bytestream_get_le16(uint8_t **b)
+{
+    (*b) += 2;
+    return LE_16(*b - 2);
+}
+
+static always_inline unsigned int bytestream_get_byte(uint8_t **b)
+{
+    (*b)++;
+    return (*b)[-1];
+}
+
+static always_inline unsigned int bytestream_get_buffer(uint8_t **b, uint8_t *dst, unsigned int size)
+{
+    memcpy(dst, *b, size);
+    (*b) += size;
+    return size;
+}
+
+#endif /* FFMPEG_BYTESTREAM_H */