rmdec: Move SIPR code shared with Matroska demuxer to a separate file

libavformat/Makefile

@@ -135,8 +135,8 @@ OBJS-$(CONFIG_LMLM4_DEMUXER)             += lmlm4.o
 OBJS-$(CONFIG_LXF_DEMUXER)               += lxfdec.o
 OBJS-$(CONFIG_M4V_DEMUXER)               += m4vdec.o rawdec.o
 OBJS-$(CONFIG_M4V_MUXER)                 += rawenc.o
-OBJS-$(CONFIG_MATROSKA_DEMUXER)          += matroskadec.o matroska.o \
+OBJS-$(CONFIG_MATROSKA_DEMUXER)          += matroskadec.o matroska.o  \
-                                            isom.o rmdec.o rm.o
+                                            isom.o rmsipr.o
 OBJS-$(CONFIG_MATROSKA_MUXER)            += matroskaenc.o matroska.o \
                                             isom.o avc.o \
                                             flacenc_header.o avlanguage.o
@@ -242,7 +242,7 @@ OBJS-$(CONFIG_R3D_DEMUXER)               += r3d.o
 OBJS-$(CONFIG_RAWVIDEO_DEMUXER)          += rawvideodec.o rawdec.o
 OBJS-$(CONFIG_RAWVIDEO_MUXER)            += rawenc.o
 OBJS-$(CONFIG_RL2_DEMUXER)               += rl2.o
-OBJS-$(CONFIG_RM_DEMUXER)                += rmdec.o rm.o
+OBJS-$(CONFIG_RM_DEMUXER)                += rmdec.o rm.o rmsipr.o
 OBJS-$(CONFIG_RM_MUXER)                  += rmenc.o rm.o
 OBJS-$(CONFIG_ROQ_DEMUXER)               += idroqdec.o
 OBJS-$(CONFIG_ROQ_MUXER)                 += idroqenc.o rawenc.o

libavformat/matroskadec.c

@@ -35,7 +35,7 @@
 /* For ff_codec_get_id(). */
 #include "riff.h"
 #include "isom.h"
-#include "rm.h"
+#include "rmsipr.h"
 #include "matroska.h"
 #include "libavcodec/bytestream.h"
 #include "libavcodec/mpeg4audio.h"

libavformat/rm.h

@@ -26,7 +26,6 @@
 #include "internal.h"
 
 extern const char * const ff_rm_metadata[4];
-extern const unsigned char ff_sipr_subpk_size[4];
 extern const AVCodecTag ff_rm_codec_tags[];
 
 typedef struct RMStream RMStream;
@@ -93,11 +92,4 @@ int ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,
 int ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,
                           AVStream *st, RMStream *rst, AVPacket *pkt);
 
-/**
- * Perform 4-bit block reordering for SIPR data.
- *
- * @param buf SIPR data
- */
-void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize);
-
 #endif /* AVFORMAT_RM_H */

libavformat/rmdec.c

@@ -25,6 +25,7 @@
 #include "avformat.h"
 #include "internal.h"
 #include "riff.h"
+#include "rmsipr.h"
 #include "rm.h"
 
 #define DEINT_ID_GENR MKTAG('g', 'e', 'n', 'r') ///< interleaving for Cooker/Atrac
@@ -59,21 +60,6 @@ typedef struct {
     int audio_pkt_cnt; ///< Output packet counter
 } RMDemuxContext;
 
-static const unsigned char sipr_swaps[38][2] = {
-    {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },
-    {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },
-    { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },
-    { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },
-    { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },
-    { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },
-    { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },
-    { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },
-    { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },
-    { 67, 83 }, { 77, 80 }
-};
-
-const unsigned char ff_sipr_subpk_size[4] = { 29, 19, 37, 20 };
-
 static inline void get_strl(AVIOContext *pb, char *buf, int buf_size, int len)
 {
     int i;
@@ -719,32 +705,6 @@ rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
     }
 }
 
-/**
- * Perform 4-bit block reordering for SIPR data.
- * @todo This can be optimized, e.g. use memcpy() if data blocks are aligned
- */
-void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize)
-{
-    int n, bs = sub_packet_h * framesize * 2 / 96; // nibbles per subpacket
-
-    for (n = 0; n < 38; n++) {
-        int j;
-        int i = bs * sipr_swaps[n][0];
-        int o = bs * sipr_swaps[n][1];
-
-        /* swap 4bit-nibbles of block 'i' with 'o' */
-        for (j = 0; j < bs; j++, i++, o++) {
-            int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,
-                y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;
-
-            buf[o >> 1] = (x << (4 * (o & 1))) |
-                (buf[o >> 1] & (0xF << (4 * !(o & 1))));
-            buf[i >> 1] = (y << (4 * (i & 1))) |
-                (buf[i >> 1] & (0xF << (4 * !(i & 1))));
-        }
-    }
-}
-
 int
 ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,
                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,

libavformat/rmsipr.c

@@ -0,0 +1,61 @@
+/*
+ * tables and functions for demuxing SIPR audio muxed RealMedia style
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdint.h>
+
+#include "rmsipr.h"
+
+const unsigned char ff_sipr_subpk_size[4] = { 29, 19, 37, 20 };
+
+static const unsigned char sipr_swaps[38][2] = {
+    {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },
+    {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },
+    { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },
+    { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },
+    { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },
+    { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },
+    { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },
+    { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },
+    { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },
+    { 67, 83 }, { 77, 80 }
+};
+
+/* This can be optimized, e.g. use memcpy() if data blocks are aligned. */
+void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize)
+{
+    int n, bs = sub_packet_h * framesize * 2 / 96; // nibbles per subpacket
+
+    for (n = 0; n < 38; n++) {
+        int j;
+        int i = bs * sipr_swaps[n][0];
+        int o = bs * sipr_swaps[n][1];
+
+        /* swap 4bit-nibbles of block 'i' with 'o' */
+        for (j = 0; j < bs; j++, i++, o++) {
+            int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,
+                y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;
+
+            buf[o >> 1] = (x << (4 * (o & 1))) |
+                (buf[o >> 1] & (0xF << (4 * !(o & 1))));
+            buf[i >> 1] = (y << (4 * (i & 1))) |
+                (buf[i >> 1] & (0xF << (4 * !(i & 1))));
+        }
+    }
+}

libavformat/rmsipr.h

@@ -0,0 +1,35 @@
+/*
+ * tables and functions for demuxing SIPR audio muxed RealMedia style
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFORMAT_RMSIPR_H
+#define AVFORMAT_RMSIPR_H
+
+#include <stdint.h>
+
+extern const unsigned char ff_sipr_subpk_size[4];
+
+/**
+ * Perform 4-bit block reordering for SIPR data.
+ *
+ * @param buf SIPR data
+ */
+void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize);
+
+#endif /* AVFORMAT_RMSIPR_H */