move ac3/eac3 demuxer to its own file

Originally committed as revision 24983 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/Makefile

@@ -18,7 +18,7 @@ OBJS = allformats.o         \
 # muxers/demuxers
 OBJS-$(CONFIG_A64_MUXER)                 += a64.o
 OBJS-$(CONFIG_AAC_DEMUXER)               += aacdec.o id3v1.o id3v2.o raw.o
-OBJS-$(CONFIG_AC3_DEMUXER)               += raw.o
+OBJS-$(CONFIG_AC3_DEMUXER)               += ac3dec.o raw.o
 OBJS-$(CONFIG_AC3_MUXER)                 += raw.o
 OBJS-$(CONFIG_ADTS_MUXER)                += adtsenc.o
 OBJS-$(CONFIG_AEA_DEMUXER)               += aea.o raw.o
@@ -64,7 +64,7 @@ OBJS-$(CONFIG_DV_MUXER)                  += dvenc.o
 OBJS-$(CONFIG_DXA_DEMUXER)               += dxa.o riff.o
 OBJS-$(CONFIG_EA_CDATA_DEMUXER)          += eacdata.o
 OBJS-$(CONFIG_EA_DEMUXER)                += electronicarts.o
-OBJS-$(CONFIG_EAC3_DEMUXER)              += raw.o
+OBJS-$(CONFIG_EAC3_DEMUXER)              += ac3dec.o raw.o
 OBJS-$(CONFIG_EAC3_MUXER)                += raw.o
 OBJS-$(CONFIG_FFM_DEMUXER)               += ffmdec.o
 OBJS-$(CONFIG_FFM_MUXER)                 += ffmenc.o

libavformat/ac3dec.c

+/*
+ * RAW AC-3 and E-AC-3 demuxer
+ * Copyright (c) 2007 Justin Ruggles <justin.ruggles@gmail.com>
+ *
+ * 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 "libavutil/crc.h"
+#include "libavcodec/ac3_parser.h"
+#include "avformat.h"
+#include "raw.h"
+
+static int ac3_eac3_probe(AVProbeData *p, enum CodecID expected_codec_id)
+{
+    int max_frames, first_frames = 0, frames;
+    uint8_t *buf, *buf2, *end;
+    AC3HeaderInfo hdr;
+    GetBitContext gbc;
+    enum CodecID codec_id = CODEC_ID_AC3;
+
+    max_frames = 0;
+    buf = p->buf;
+    end = buf + p->buf_size;
+
+    for(; buf < end; buf++) {
+        buf2 = buf;
+
+        for(frames = 0; buf2 < end; frames++) {
+            init_get_bits(&gbc, buf2, 54);
+            if(ff_ac3_parse_header(&gbc, &hdr) < 0)
+                break;
+            if(buf2 + hdr.frame_size > end ||
+               av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, buf2 + 2, hdr.frame_size - 2))
+                break;
+            if (hdr.bitstream_id > 10)
+                codec_id = CODEC_ID_EAC3;
+            buf2 += hdr.frame_size;
+        }
+        max_frames = FFMAX(max_frames, frames);
+        if(buf == p->buf)
+            first_frames = frames;
+    }
+    if(codec_id != expected_codec_id) return 0;
+    // keep this in sync with mp3 probe, both need to avoid
+    // issues with MPEG-files!
+    if   (first_frames>=4) return AVPROBE_SCORE_MAX/2+1;
+    else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
+    else if(max_frames>=4) return AVPROBE_SCORE_MAX/4;
+    else if(max_frames>=1) return 1;
+    else                   return 0;
+}
+
+#if CONFIG_AC3_DEMUXER
+static int ac3_probe(AVProbeData *p)
+{
+    return ac3_eac3_probe(p, CODEC_ID_AC3);
+}
+
+AVInputFormat ac3_demuxer = {
+    "ac3",
+    NULL_IF_CONFIG_SMALL("raw AC-3"),
+    0,
+    ac3_probe,
+    ff_raw_audio_read_header,
+    ff_raw_read_partial_packet,
+    .flags= AVFMT_GENERIC_INDEX,
+    .extensions = "ac3",
+    .value = CODEC_ID_AC3,
+};
+#endif
+
+#if CONFIG_EAC3_DEMUXER
+static int eac3_probe(AVProbeData *p)
+{
+    return ac3_eac3_probe(p, CODEC_ID_EAC3);
+}
+
+AVInputFormat eac3_demuxer = {
+    "eac3",
+    NULL_IF_CONFIG_SMALL("raw E-AC-3"),
+    0,
+    eac3_probe,
+    ff_raw_audio_read_header,
+    ff_raw_read_partial_packet,
+    .flags= AVFMT_GENERIC_INDEX,
+    .extensions = "eac3",
+    .value = CODEC_ID_EAC3,
+};
+#endif

libavformat/raw.c

@@ -20,8 +20,6 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include "libavutil/crc.h"
-#include "libavcodec/ac3_parser.h"
 #include "libavcodec/get_bits.h"
 #include "libavcodec/bytestream.h"
 #include "avformat.h"
@@ -241,78 +239,8 @@ int ff_raw_video_read_header(AVFormatContext *s,
 }
 #endif
 
-#if CONFIG_AC3_DEMUXER || CONFIG_EAC3_DEMUXER
-static int ac3_eac3_probe(AVProbeData *p, enum CodecID expected_codec_id)
-{
-    int max_frames, first_frames = 0, frames;
-    uint8_t *buf, *buf2, *end;
-    AC3HeaderInfo hdr;
-    GetBitContext gbc;
-    enum CodecID codec_id = CODEC_ID_AC3;
-
-    max_frames = 0;
-    buf = p->buf;
-    end = buf + p->buf_size;
-
-    for(; buf < end; buf++) {
-        buf2 = buf;
-
-        for(frames = 0; buf2 < end; frames++) {
-            init_get_bits(&gbc, buf2, 54);
-            if(ff_ac3_parse_header(&gbc, &hdr) < 0)
-                break;
-            if(buf2 + hdr.frame_size > end ||
-               av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, buf2 + 2, hdr.frame_size - 2))
-                break;
-            if (hdr.bitstream_id > 10)
-                codec_id = CODEC_ID_EAC3;
-            buf2 += hdr.frame_size;
-        }
-        max_frames = FFMAX(max_frames, frames);
-        if(buf == p->buf)
-            first_frames = frames;
-    }
-    if(codec_id != expected_codec_id) return 0;
-    // keep this in sync with mp3 probe, both need to avoid
-    // issues with MPEG-files!
-    if   (first_frames>=4) return AVPROBE_SCORE_MAX/2+1;
-    else if(max_frames>500)return AVPROBE_SCORE_MAX/2;
-    else if(max_frames>=4) return AVPROBE_SCORE_MAX/4;
-    else if(max_frames>=1) return 1;
-    else                   return 0;
-}
-#endif
-
-#if CONFIG_AC3_DEMUXER
-static int ac3_probe(AVProbeData *p)
-{
-    return ac3_eac3_probe(p, CODEC_ID_AC3);
-}
-#endif
-
-#if CONFIG_EAC3_DEMUXER
-static int eac3_probe(AVProbeData *p)
-{
-    return ac3_eac3_probe(p, CODEC_ID_EAC3);
-}
-#endif
-
 /* Note: Do not forget to add new entries to the Makefile as well. */
 
-#if CONFIG_AC3_DEMUXER
-AVInputFormat ac3_demuxer = {
-    "ac3",
-    NULL_IF_CONFIG_SMALL("raw AC-3"),
-    0,
-    ac3_probe,
-    ff_raw_audio_read_header,
-    ff_raw_read_partial_packet,
-    .flags= AVFMT_GENERIC_INDEX,
-    .extensions = "ac3",
-    .value = CODEC_ID_AC3,
-};
-#endif
-
 #if CONFIG_AC3_MUXER
 AVOutputFormat ac3_muxer = {
     "ac3",
@@ -373,20 +301,6 @@ AVOutputFormat dts_muxer = {
 };
 #endif
 
-#if CONFIG_EAC3_DEMUXER
-AVInputFormat eac3_demuxer = {
-    "eac3",
-    NULL_IF_CONFIG_SMALL("raw E-AC-3"),
-    0,
-    eac3_probe,
-    ff_raw_audio_read_header,
-    ff_raw_read_partial_packet,
-    .flags= AVFMT_GENERIC_INDEX,
-    .extensions = "eac3",
-    .value = CODEC_ID_EAC3,
-};
-#endif
-
 #if CONFIG_EAC3_MUXER
 AVOutputFormat eac3_muxer = {
     "eac3",