lavf: use a new ffio_wfourcc macro instead of put_tag() where possible

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

12 files changed, 166 insertions, 152 deletions

diff --git a/libavformat/aiffenc.c b/libavformat/aiffenc.c
index 49aff8bd78..de88382e67 100644
--- a/libavformat/aiffenc.c
+++ b/libavformat/aiffenc.c
@@ -21,6 +21,7 @@
 
 #include "avformat.h"
 #include "aiff.h"
+#include "avio_internal.h"
 
 typedef struct {
     int64_t form;
@@ -43,10 +44,10 @@ static int aiff_write_header(AVFormatContext *s)
         aifc = 1;
 
     /* FORM AIFF header */
-    put_tag(pb, "FORM");
+    ffio_wfourcc(pb, "FORM");
     aiff->form = url_ftell(pb);
     avio_wb32(pb, 0);                    /* file length */
-    put_tag(pb, aifc ? "AIFC" : "AIFF");
+    ffio_wfourcc(pb, aifc ? "AIFC" : "AIFF");
 
     if (aifc) { // compressed audio
         enc->bits_per_coded_sample = 16;
@@ -55,13 +56,13 @@ static int aiff_write_header(AVFormatContext *s)
             return -1;
         }
         /* Version chunk */
-        put_tag(pb, "FVER");
+        ffio_wfourcc(pb, "FVER");
         avio_wb32(pb, 4);
         avio_wb32(pb, 0xA2805140);
     }
 
     /* Common chunk */
-    put_tag(pb, "COMM");
+    ffio_wfourcc(pb, "COMM");
     avio_wb32(pb, aifc ? 24 : 18); /* size */
     avio_wb16(pb, enc->channels);  /* Number of channels */
 
@@ -88,7 +89,7 @@ static int aiff_write_header(AVFormatContext *s)
     }
 
     /* Sound data chunk */
-    put_tag(pb, "SSND");
+    ffio_wfourcc(pb, "SSND");
     aiff->ssnd = url_ftell(pb);         /* Sound chunk size */
     avio_wb32(pb, 0);                    /* Sound samples data size */
     avio_wb32(pb, 0);                    /* Data offset */
diff --git a/libavformat/au.c b/libavformat/au.c
index 486c514087..9aed1dcaf3 100644
--- a/libavformat/au.c
+++ b/libavformat/au.c
@@ -28,6 +28,7 @@
  */
 
 #include "avformat.h"
+#include "avio_internal.h"
 #include "pcm.h"
 #include "riff.h"
 
@@ -53,7 +54,7 @@ static int put_au_header(AVIOContext *pb, AVCodecContext *enc)
 {
     if(!enc->codec_tag)
         return -1;
-    put_tag(pb, ".snd");       /* magic number */
+    ffio_wfourcc(pb, ".snd");    /* magic number */
     avio_wb32(pb, 24);           /* header size */
     avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
     avio_wb32(pb, (uint32_t)enc->codec_tag);     /* codec ID */
diff --git a/libavformat/avienc.c b/libavformat/avienc.c
index e109269fa3..24acc9297c 100644
--- a/libavformat/avienc.c
+++ b/libavformat/avienc.c
@@ -20,6 +20,7 @@
  */
 #include "avformat.h"
 #include "avi.h"
+#include "avio_internal.h"
 #include "riff.h"
 #include "libavutil/intreadwrite.h"
 
@@ -77,9 +78,9 @@ static int64_t avi_start_new_riff(AVFormatContext *s, AVIOContext *pb,
     }
 
     avi->riff_start = ff_start_tag(pb, "RIFF");
-    put_tag(pb, riff_tag);
+    ffio_wfourcc(pb, riff_tag);
     loff = ff_start_tag(pb, "LIST");
-    put_tag(pb, list_tag);
+    ffio_wfourcc(pb, list_tag);
     return loff;
 }
 
@@ -107,7 +108,7 @@ static void avi_write_info_tag(AVIOContext *pb, const char *tag, const char *str
     int len = strlen(str);
     if (len > 0) {
         len++;
-        put_tag(pb, tag);
+        ffio_wfourcc(pb, tag);
         avio_wl32(pb, len);
         avio_put_str(pb, str);
         if (len & 1)
@@ -175,7 +176,7 @@ static int avi_write_header(AVFormatContext *s)
     list1 = avi_start_new_riff(s, pb, "AVI ", "hdrl");
 
     /* avi header */
-    put_tag(pb, "avih");
+    ffio_wfourcc(pb, "avih");
     avio_wl32(pb, 14 * 4);
     bitrate = 0;
 
@@ -221,7 +222,7 @@ static int avi_write_header(AVFormatContext *s)
     for(i=0;i<n;i++) {
         AVIStream *avist= s->streams[i]->priv_data;
         list2 = ff_start_tag(pb, "LIST");
-        put_tag(pb, "strl");
+        ffio_wfourcc(pb, "strl");
 
         stream = s->streams[i]->codec;
 
@@ -235,10 +236,10 @@ static int avi_write_header(AVFormatContext *s)
                 av_log(s, AV_LOG_ERROR, "Subtitle streams other than DivX XSUB are not supported by the AVI muxer.\n");
                 return AVERROR_PATCHWELCOME;
             }
-        case AVMEDIA_TYPE_VIDEO: put_tag(pb, "vids"); break;
-        case AVMEDIA_TYPE_AUDIO: put_tag(pb, "auds"); break;
-//        case AVMEDIA_TYPE_TEXT : put_tag(pb, "txts"); break;
-        case AVMEDIA_TYPE_DATA : put_tag(pb, "dats"); break;
+        case AVMEDIA_TYPE_VIDEO: ffio_wfourcc(pb, "vids"); break;
+        case AVMEDIA_TYPE_AUDIO: ffio_wfourcc(pb, "auds"); break;
+//      case AVMEDIA_TYPE_TEXT : ffio_wfourcc(pb, "txts"); break;
+        case AVMEDIA_TYPE_DATA : ffio_wfourcc(pb, "dats"); break;
         }
         if(stream->codec_type == AVMEDIA_TYPE_VIDEO ||
            stream->codec_id == CODEC_ID_XSUB)
@@ -317,7 +318,7 @@ static int avi_write_header(AVFormatContext *s)
             avio_w8(pb, 0);          /* bIndexSubType (0 == frame index) */
             avio_w8(pb, 0);          /* bIndexType (0 == AVI_INDEX_OF_INDEXES) */
             avio_wl32(pb, 0);        /* nEntriesInUse (will fill out later on) */
-            put_tag(pb, avi_stream2fourcc(&tag[0], i, stream->codec_type));
+            ffio_wfourcc(pb, avi_stream2fourcc(&tag[0], i, stream->codec_type));
                                     /* dwChunkId */
             avio_wl64(pb, 0);        /* dwReserved[3]
             avio_wl32(pb, 0);           Must be 0.    */
@@ -364,8 +365,8 @@ static int avi_write_header(AVFormatContext *s)
     if (!url_is_streamed(pb)) {
         /* AVI could become an OpenDML one, if it grows beyond 2Gb range */
         avi->odml_list = ff_start_tag(pb, "JUNK");
-        put_tag(pb, "odml");
-        put_tag(pb, "dmlh");
+        ffio_wfourcc(pb, "odml");
+        ffio_wfourcc(pb, "dmlh");
         avio_wl32(pb, 248);
         for (i = 0; i < 248; i+= 4)
              avio_wl32(pb, 0);
@@ -375,7 +376,7 @@ static int avi_write_header(AVFormatContext *s)
     ff_end_tag(pb, list1);
 
     list2 = ff_start_tag(pb, "LIST");
-    put_tag(pb, "INFO");
+    ffio_wfourcc(pb, "INFO");
     ff_metadata_conv(&s->metadata, ff_avi_metadata_conv, NULL);
     for (i = 0; *ff_avi_tags[i]; i++) {
         if ((t = av_metadata_get(s->metadata, ff_avi_tags[i], NULL, AV_METADATA_MATCH_CASE)))
@@ -390,7 +391,7 @@ static int avi_write_header(AVFormatContext *s)
     ff_end_tag(pb, list2);
 
     avi->movi_list = ff_start_tag(pb, "LIST");
-    put_tag(pb, "movi");
+    ffio_wfourcc(pb, "movi");
 
     put_flush_packet(pb);
 
@@ -419,7 +420,7 @@ static int avi_write_ix(AVFormatContext *s)
 
          /* Writing AVI OpenDML leaf index chunk */
          ix = url_ftell(pb);
-         put_tag(pb, &ix_tag[0]);     /* ix?? */
+         ffio_wfourcc(pb, &ix_tag[0]);     /* ix?? */
          avio_wl32(pb, avist->indexes.entry * 8 + 24);
                                       /* chunk size */
          avio_wl16(pb, 2);             /* wLongsPerEntry */
@@ -427,7 +428,7 @@ static int avi_write_ix(AVFormatContext *s)
          avio_w8(pb, 1);             /* bIndexType (1 == AVI_INDEX_OF_CHUNKS) */
          avio_wl32(pb, avist->indexes.entry);
                                       /* nEntriesInUse */
-         put_tag(pb, &tag[0]);        /* dwChunkId */
+         ffio_wfourcc(pb, &tag[0]);    /* dwChunkId */
          avio_wl64(pb, avi->movi_list);/* qwBaseOffset */
          avio_wl32(pb, 0);             /* dwReserved_3 (must be 0) */
 
@@ -442,7 +443,7 @@ static int avi_write_ix(AVFormatContext *s)
 
          /* Updating one entry in the AVI OpenDML master index */
          url_fseek(pb, avist->indexes.indx_start - 8, SEEK_SET);
-         put_tag(pb, "indx");                 /* enabling this entry */
+         ffio_wfourcc(pb, "indx");            /* enabling this entry */
          url_fskip(pb, 8);
          avio_wl32(pb, avi->riff_id);         /* nEntriesInUse */
          url_fskip(pb, 16*avi->riff_id);
@@ -492,7 +493,7 @@ static int avi_write_idx1(AVFormatContext *s)
                 avist= s->streams[stream_id]->priv_data;
                 avi_stream2fourcc(&tag[0], stream_id,
                                   s->streams[stream_id]->codec->codec_type);
-                put_tag(pb, &tag[0]);
+                ffio_wfourcc(pb, &tag[0]);
                 avio_wl32(pb, ie->flags);
                 avio_wl32(pb, ie->pos);
                 avio_wl32(pb, ie->len);
@@ -601,7 +602,7 @@ static int avi_write_trailer(AVFormatContext *s)
 
             file_size = url_ftell(pb);
             url_fseek(pb, avi->odml_list - 8, SEEK_SET);
-            put_tag(pb, "LIST"); /* Making this AVI OpenDML one */
+            ffio_wfourcc(pb, "LIST"); /* Making this AVI OpenDML one */
             url_fskip(pb, 16);
 
             for (n=nb_frames=0;n<s->nb_streams;n++) {
diff --git a/libavformat/avio_internal.h b/libavformat/avio_internal.h
index 85e7f069e2..3b38990f56 100644
--- a/libavformat/avio_internal.h
+++ b/libavformat/avio_internal.h
@@ -42,4 +42,6 @@ int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size);
 
 void ffio_fill(AVIOContext *s, int b, int count);
 
+#define ffio_wfourcc(pb, str) avio_wl32(pb, MKTAG((str)[0], (str)[1], (str)[2], (str)[3]))
+
 #endif // AVFORMAT_AVIO_INTERNAL_H
diff --git a/libavformat/img2.c b/libavformat/img2.c
index 25ed2b32e8..a9a4a49023 100644
--- a/libavformat/img2.c
+++ b/libavformat/img2.c
@@ -23,6 +23,7 @@
 #include "libavutil/intreadwrite.h"
 #include "libavutil/avstring.h"
 #include "avformat.h"
+#include "avio_internal.h"
 #include <strings.h>
 
 typedef struct {
@@ -383,13 +384,13 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt)
                 if(pkt->size < 8 || AV_RL32(pkt->data+4) != MKTAG('j','p','2','c'))
                     goto error;
                 avio_wb32(pb[0], 12);
-                put_tag (pb[0], "jP  ");
+                ffio_wfourcc(pb[0], "jP  ");
                 avio_wb32(pb[0], 0x0D0A870A); // signature
                 avio_wb32(pb[0], 20);
-                put_tag (pb[0], "ftyp");
-                put_tag (pb[0], "jp2 ");
+                ffio_wfourcc(pb[0], "ftyp");
+                ffio_wfourcc(pb[0], "jp2 ");
                 avio_wb32(pb[0], 0);
-                put_tag (pb[0], "jp2 ");
+                ffio_wfourcc(pb[0], "jp2 ");
                 avio_write(pb[0], st->codec->extradata, st->codec->extradata_size);
             }else if(pkt->size < 8 ||
                      (!st->codec->extradata_size &&
diff --git a/libavformat/mmf.c b/libavformat/mmf.c
index eb48b782d2..76b27dd71e 100644
--- a/libavformat/mmf.c
+++ b/libavformat/mmf.c
@@ -19,6 +19,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include "avformat.h"
+#include "avio_internal.h"
 #include "pcm.h"
 #include "riff.h"
 
@@ -70,7 +71,7 @@ static int mmf_write_header(AVFormatContext *s)
         return -1;
     }
 
-    put_tag(pb, "MMMD");
+    ffio_wfourcc(pb, "MMMD");
     avio_wb32(pb, 0);
     pos = ff_start_tag(pb, "CNTI");
     avio_w8(pb, 0); /* class */
@@ -91,7 +92,7 @@ static int mmf_write_header(AVFormatContext *s)
     avio_w8(pb, 2); /* time base d */
     avio_w8(pb, 2); /* time base g */
 
-    put_tag(pb, "Atsq");
+    ffio_wfourcc(pb, "Atsq");
     avio_wb32(pb, 16);
     mmf->atsqpos = url_ftell(pb);
     /* Will be filled on close */
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 9c45352e0f..711aa68e98 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -23,6 +23,7 @@
 
 #include "movenc.h"
 #include "avformat.h"
+#include "avio_internal.h"
 #include "riff.h"
 #include "avio.h"
 #include "isom.h"
@@ -55,9 +56,9 @@ static int mov_write_stco_tag(AVIOContext *pb, MOVTrack *track)
     avio_wb32(pb, 0); /* size */
     if (pos > UINT32_MAX) {
         mode64 = 1;
-        put_tag(pb, "co64");
+        ffio_wfourcc(pb, "co64");
     } else
-        put_tag(pb, "stco");
+        ffio_wfourcc(pb, "stco");
     avio_wb32(pb, 0); /* version & flags */
     avio_wb32(pb, track->entry); /* entry count */
     for (i=0; i<track->entry; i++) {
@@ -77,7 +78,7 @@ static int mov_write_stsz_tag(AVIOContext *pb, MOVTrack *track)
 
     int64_t pos = url_ftell(pb);
     avio_wb32(pb, 0); /* size */
-    put_tag(pb, "stsz");
+    ffio_wfourcc(pb, "stsz");
     avio_wb32(pb, 0); /* version & flags */
 
     for (i=0; i<track->entry; i++) {
@@ -114,7 +115,7 @@ static int mov_write_stsc_tag(AVIOContext *pb, MOVTrack *track)
 
     int64_t pos = url_ftell(pb);
     avio_wb32(pb, 0); /* size */
-    put_tag(pb, "stsc");
+    ffio_wfourcc(pb, "stsc");
     avio_wb32(pb, 0); // version & flags
     entryPos = url_ftell(pb);
     avio_wb32(pb, track->entry); // entry count
@@ -143,7 +144,7 @@ static int mov_write_stss_tag(AVIOContext *pb, MOVTrack *track, uint32_t flag)
     int i, index = 0;
     int64_t pos = url_ftell(pb);
     avio_wb32(pb, 0); // size
-    put_tag(pb, flag == MOV_SYNC_SAMPLE ? "stss" : "stps");
+    ffio_wfourcc(pb, flag == MOV_SYNC_SAMPLE ? "stss" : "stps");
     avio_wb32(pb, 0); // version & flags
     entryPos = url_ftell(pb);
     avio_wb32(pb, track->entry); // entry count
@@ -163,9 +164,9 @@ static int mov_write_stss_tag(AVIOContext *pb, MOVTrack *track, uint32_t flag)
 static int mov_write_amr_tag(AVIOContext *pb, MOVTrack *track)
 {
     avio_wb32(pb, 0x11); /* size */
-    if (track->mode == MODE_MOV) put_tag(pb, "samr");
-    else                         put_tag(pb, "damr");
-    put_tag(pb, "FFMP");
+    if (track->mode == MODE_MOV) ffio_wfourcc(pb, "samr");
+    else                         ffio_wfourcc(pb, "damr");
+    ffio_wfourcc(pb, "FFMP");
     avio_w8(pb, 0); /* decoder version */
 
     avio_wb16(pb, 0x81FF); /* Mode set (all modes for AMR_NB) */
@@ -185,7 +186,7 @@ static int mov_write_ac3_tag(AVIOContext *pb, MOVTrack *track)
         return -1;
 
     avio_wb32(pb, 11);
-    put_tag(pb, "dac3");
+    ffio_wfourcc(pb, "dac3");
 
     init_get_bits(&gbc, track->vosData+4, track->vosLen-4);
     fscod      = get_bits(&gbc, 2);
@@ -231,7 +232,7 @@ static int mov_write_extradata_tag(AVIOContext *pb, MOVTrack *track)
 static int mov_write_enda_tag(AVIOContext *pb)
 {
     avio_wb32(pb, 10);
-    put_tag(pb, "enda");
+    ffio_wfourcc(pb, "enda");
     avio_wb16(pb, 1); /* little endian */
     return 10;
 }
@@ -258,7 +259,7 @@ static int mov_write_esds_tag(AVIOContext *pb, MOVTrack *track) // Basic
     int decoderSpecificInfoLen = track->vosLen ? descrLength(track->vosLen):0;
 
     avio_wb32(pb, 0); // size
-    put_tag(pb, "esds");
+    ffio_wfourcc(pb, "esds");
     avio_wb32(pb, 0); // Version
 
     // ES descriptor
@@ -329,16 +330,16 @@ static int mov_write_wave_tag(AVIOContext *pb, MOVTrack *track)
     int64_t pos = url_ftell(pb);
 
     avio_wb32(pb, 0);     /* size */
-    put_tag(pb, "wave");
+    ffio_wfourcc(pb, "wave");
 
     avio_wb32(pb, 12);    /* size */
-    put_tag(pb, "frma");
+    ffio_wfourcc(pb, "frma");
     avio_wl32(pb, track->tag);
 
     if (track->enc->codec_id == CODEC_ID_AAC) {
         /* useless atom needed by mplayer, ipod, not needed by quicktime */
         avio_wb32(pb, 12); /* size */
-        put_tag(pb, "mp4a");
+        ffio_wfourcc(pb, "mp4a");
         avio_wb32(pb, 0);
         mov_write_esds_tag(pb, track);
     } else if (mov_pcm_le_gt16(track->enc->codec_id)) {
@@ -363,7 +364,7 @@ static int mov_write_wave_tag(AVIOContext *pb, MOVTrack *track)
 static int mov_write_glbl_tag(AVIOContext *pb, MOVTrack *track)
 {
     avio_wb32(pb, track->vosLen+8);
-    put_tag(pb, "glbl");
+    ffio_wfourcc(pb, "glbl");
     avio_write(pb, track->vosData, track->vosLen);
     return 8+track->vosLen;
 }
@@ -493,8 +494,8 @@ static int mov_write_audio_tag(AVIOContext *pb, MOVTrack *track)
 static int mov_write_d263_tag(AVIOContext *pb)
 {
     avio_wb32(pb, 0xf); /* size */
-    put_tag(pb, "d263");
-    put_tag(pb, "FFMP");
+    ffio_wfourcc(pb, "d263");
+    ffio_wfourcc(pb, "FFMP");
     avio_w8(pb, 0); /* decoder version */
     /* FIXME use AVCodecContext level/profile, when encoder will set values */
     avio_w8(pb, 0xa); /* level */
@@ -506,8 +507,8 @@ static int mov_write_d263_tag(AVIOContext *pb)
 static int mov_write_svq3_tag(AVIOContext *pb)
 {
     avio_wb32(pb, 0x15);
-    put_tag(pb, "SMI ");
-    put_tag(pb, "SEQH");
+    ffio_wfourcc(pb, "SMI ");
+    ffio_wfourcc(pb, "SEQH");
     avio_wb32(pb, 0x5);
     avio_wb32(pb, 0xe2c0211d);
     avio_wb32(pb, 0xc0000000);
@@ -520,7 +521,7 @@ static int mov_write_avcc_tag(AVIOContext *pb, MOVTrack *track)
     int64_t pos = url_ftell(pb);
 
     avio_wb32(pb, 0);
-    put_tag(pb, "avcC");
+    ffio_wfourcc(pb, "avcC");
     ff_isom_write_avcc(pb, track->vosData, track->vosLen);
     return updateSize(pb, pos);
 }
@@ -530,23 +531,23 @@ static int mov_write_avid_tag(AVIOContext *pb, MOVTrack *track)
 {
     int i;
     avio_wb32(pb, 24); /* size */
-    put_tag(pb, "ACLR");
-    put_tag(pb, "ACLR");
-    put_tag(pb, "0001");
+    ffio_wfourcc(pb, "ACLR");
+    ffio_wfourcc(pb, "ACLR");
+    ffio_wfourcc(pb, "0001");
     avio_wb32(pb, 1); /* yuv 1 / rgb 2 ? */
     avio_wb32(pb, 0); /* unknown */
 
     avio_wb32(pb, 24); /* size */
-    put_tag(pb, "APRG");
-    put_tag(pb, "APRG");
-    put_tag(pb, "0001");
+    ffio_wfourcc(pb, "APRG");
+    ffio_wfourcc(pb, "APRG");
+    ffio_wfourcc(pb, "0001");
     avio_wb32(pb, 1); /* unknown */
     avio_wb32(pb, 0); /* unknown */
 
     avio_wb32(pb, 120); /* size */
-    put_tag(pb, "ARES");
-    put_tag(pb, "ARES");
-    put_tag(pb, "0001");
+    ffio_wfourcc(pb, "ARES");
+    ffio_wfourcc(pb, "ARES");
+    ffio_wfourcc(pb, "0001");
     avio_wb32(pb, AV_RB32(track->vosData + 0x28)); /* dnxhd cid, some id ? */
     avio_wb32(pb, track->enc->width);
     /* values below are based on samples created with quicktime and avid codecs */
@@ -741,7 +742,7 @@ static int mov_find_codec_tag(AVFormatContext *s, MOVTrack *track)
 static int mov_write_uuid_tag_ipod(AVIOContext *pb)
 {
     avio_wb32(pb, 28);
-    put_tag(pb, "uuid");
+    ffio_wfourcc(pb, "uuid");
     avio_wb32(pb, 0x6b6840f2);
     avio_wb32(pb, 0x5f244fc5);
     avio_wb32(pb, 0xba39a51b);
@@ -772,7 +773,7 @@ static int mov_write_pasp_tag(AVIOContext *pb, MOVTrack *track)
               track->enc->sample_aspect_ratio.den, INT_MAX);
 
     avio_wb32(pb, 16);
-    put_tag(pb, "pasp");
+    ffio_wfourcc(pb, "pasp");
     avio_wb32(pb, sar.num);
     avio_wb32(pb, sar.den);
     return 16;
@@ -792,7 +793,7 @@ static int mov_write_video_tag(AVIOContext *pb, MOVTrack *track)
     avio_wb16(pb, 0); /* Codec stream version */
     avio_wb16(pb, 0); /* Codec stream revision (=0) */
     if (track->mode == MODE_MOV) {
-        put_tag(pb, "FFMP"); /* Vendor */
+        ffio_wfourcc(pb, "FFMP"); /* Vendor */
         if(track->enc->codec_id == CODEC_ID_RAWVIDEO) {
             avio_wb32(pb, 0); /* Temporal Quality */
             avio_wb32(pb, 0x400); /* Spatial Quality = lossless*/
@@ -852,7 +853,7 @@ static int mov_write_rtp_tag(AVIOContext *pb, MOVTrack *track)
 {
     int64_t pos = url_ftell(pb);
     avio_wb32(pb, 0); /* size */
-    put_tag(pb, "rtp ");
+    ffio_wfourcc(pb, "rtp ");
     avio_wb32(pb, 0); /* Reserved */
     avio_wb16(pb, 0); /* Reserved */
     avio_wb16(pb, 1); /* Data-reference index */
@@ -862,7 +863,7 @@ static int mov_write_rtp_tag(AVIOContext *pb, MOVTrack *track)
     avio_wb32(pb, track->max_packet_size); /* Max packet size */
 
     avio_wb32(pb, 12); /* size */
-    put_tag(pb, "tims");
+    ffio_wfourcc(pb, "tims");
     avio_wb32(pb, track->timescale);
 
     return updateSize(pb, pos);
@@ -872,7 +873,7 @@ static int mov_write_stsd_tag(AVIOContext *pb, MOVTrack *track)
 {
     int64_t pos = url_ftell(pb);
     avio_wb32(pb, 0); /* size */
-    put_tag(pb, "stsd");
+    ffio_wfourcc(pb, "stsd");
     avio_wb32(pb, 0); /* version & flags */
     avio_wb32(pb, 1); /* entry count */
     if (track->enc->codec_type == AVMEDIA_TYPE_VIDEO)
@@ -908,7 +909,7 @@ static int mov_write_ctts_tag(AVIOContext *pb, MOVTrack *track)
     entries++; /* last one */
     atom_size = 16 + (entries * 8);
     avio_wb32(pb, atom_size); /* size */
-    put_tag(pb, "ctts");
+    ffio_wfourcc(pb, "ctts");
     avio_wb32(pb, 0); /* version & flags */
     avio_wb32(pb, entries); /* entry count */
     for (i=0; i<entries; i++) {
@@ -950,7 +951,7 @@ static int mov_write_stts_tag(AVIOContext *pb, MOVTrack *track)
     }
     atom_size = 16 + (entries * 8);
     avio_wb32(pb, atom_size); /* size */
-    put_tag(pb, "stts");
+    ffio_wfourcc(pb, "stts");
     avio_wb32(pb, 0); /* version & flags */
     avio_wb32(pb, entries); /* entry count */
     for (i=0; i<entries; i++) {
@@ -964,12 +965,12 @@ static int mov_write_stts_tag(AVIOContext *pb, MOVTrack *track)
 static int mov_write_dref_tag(AVIOContext *pb)
 {
     avio_wb32(pb, 28); /* size */
-    put_tag(pb, "dref");
+    ffio_wfourcc(pb, "dref");
     avio_wb32(pb, 0); /* version & flags */
     avio_wb32(pb, 1); /* entry count */
 
     avio_wb32(pb, 0xc); /* size */
-    put_tag(pb, "url ");
+    ffio_wfourcc(pb, "url ");
     avio_wb32(pb, 1); /* version & flags */
 
     return 28;
@@ -979,7 +980,7 @@ static int mov_write_stbl_tag(AVIOContext *pb, MOVTrack *track)
 {
     int64_t pos = url_ftell(pb);
     avio_wb32(pb, 0); /* size */
-    put_tag(pb, "stbl");
+    ffio_wfourcc(pb, "stbl");
     mov_write_stsd_tag(pb, track);
     mov_write_stts_tag(pb, track);
     if ((track->enc->codec_type == AVMEDIA_TYPE_VIDEO ||
@@ -1001,7 +1002,7 @@ static int mov_write_dinf_tag(AVIOContext *pb)
 {
     int64_t pos = url_ftell(pb);
     avio_wb32(pb, 0); /* size */
-    put_tag(pb, "dinf");
+    ffio_wfourcc(pb, "dinf");
     mov_write_dref_tag(pb);
     return updateSize(pb, pos);
 }
@@ -1009,7 +1010,7 @@ static int mov_write_dinf_tag(AVIOContext *pb)
 static int mov_write_nmhd_tag(AVIOContext *pb)
 {
     avio_wb32(pb, 12);
-    put_tag(pb, "nmhd");
+    ffio_wfourcc(pb, "nmhd");
     avio_wb32(pb, 0);
     return 12;
 }
@@ -1017,9 +1018,9 @@ static int mov_write_nmhd_tag(AVIOContext *pb)
 static int mov_write_gmhd_tag(AVIOContext *pb)
 {
     avio_wb32(pb, 0x20);   /* size */
-    put_tag(pb, "gmhd");
+    ffio_wfourcc(pb, "gmhd");
     avio_wb32(pb, 0x18);   /* gmin size */
-    put_tag(pb, "gmin");  /* generic media info */
+    ffio_wfourcc(pb, "gmin");/* generic media info */
     avio_wb32(pb, 0);      /* version & flags */
     avio_wb16(pb, 0x40);   /* graphics mode = */
     avio_wb16(pb, 0x8000); /* opColor (r?) */
@@ -1033,7 +1034,7 @@ static int mov_write_gmhd_tag(AVIOContext *pb)
 static int mov_write_smhd_tag(AVIOContext *pb)
 {
     avio_wb32(pb, 16); /* size */
-    put_tag(pb, "smhd");
+    ffio_wfourcc(pb, "smhd");
     avio_wb32(pb, 0); /* version & flags */
     avio_wb16(pb, 0); /* reserved (balance, normally = 0) */
     avio_wb16(pb, 0); /* reserved */
@@ -1043,7 +1044,7 @@ static int mov_write_smhd_tag(AVIOContext *pb)
 static int mov_write_vmhd_tag(AVIOContext *pb)
 {
     avio_wb32(pb, 0x14); /* size (always 0x14) */
-    put_tag(pb, "vmhd");
+    ffio_wfourcc(pb, "vmhd");
     avio_wb32(pb, 0x01); /* version & flags */
     avio_wb64(pb, 0); /* reserved (graphics mode = copy) */
     return 0x14;
@@ -1077,10 +1078,10 @@ static int mov_write_hdlr_tag(AVIOContext *pb, MOVTrack *track)
     }
 
     avio_wb32(pb, 0); /* size */
-    put_tag(pb, "hdlr");
+    ffio_wfourcc(pb, "hdlr");
     avio_wb32(pb, 0); /* Version & flags */
     avio_write(pb, hdlr, 4); /* handler */
-    put_tag(pb, hdlr_type); /* handler type */
+    ffio_wfourcc(pb, hdlr_type); /* handler type */
     avio_wb32(pb ,0); /* reserved */
     avio_wb32(pb ,0); /* reserved */
     avio_wb32(pb ,0); /* reserved */
@@ -1097,7 +1098,7 @@ static int mov_write_hmhd_tag(AVIOContext *pb)
     /* This atom must be present, but leaving the values at zero
      * seems harmless. */
     avio_wb32(pb, 28); /* size */
-    put_tag(pb, "hmhd");
+    ffio_wfourcc(pb, "hmhd");
     avio_wb32(pb, 0); /* version, flags */
     avio_wb16(pb, 0); /* maxPDUsize */
     avio_wb16(pb, 0); /* avgPDUsize */
@@ -1111,7 +1112,7 @@ static int mov_write_minf_tag(AVIOContext *pb, MOVTrack *track)
 {
     int64_t pos = url_ftell(pb);
     avio_wb32(pb, 0); /* size */
-    put_tag(pb, "minf");
+    ffio_wfourcc(pb, "minf");
     if(track->enc->codec_type == AVMEDIA_TYPE_VIDEO)
         mov_write_vmhd_tag(pb);
     else if (track->enc->codec_type == AVMEDIA_TYPE_AUDIO)
@@ -1134,7 +1135,7 @@ static int mov_write_mdhd_tag(AVIOContext *pb, MOVTrack *track)
     int version = track->trackDuration < INT32_MAX ? 0 : 1;
 
     (version == 1) ? avio_wb32(pb, 44) : avio_wb32(pb, 32); /* size */
-    put_tag(pb, "mdhd");
+    ffio_wfourcc(pb, "mdhd");
     avio_w8(pb, version);
     avio_wb24(pb, 0); /* flags */
     if (version == 1) {
@@ -1163,7 +1164,7 @@ static int mov_write_mdia_tag(AVIOContext *pb, MOVTrack *track)
 {
     int64_t pos = url_ftell(pb);
     avio_wb32(pb, 0); /* size */
-    put_tag(pb, "mdia");
+    ffio_wfourcc(pb, "mdia");
     mov_write_mdhd_tag(pb, track);
     mov_write_hdlr_tag(pb, track);
     mov_write_minf_tag(pb, track);
@@ -1177,7 +1178,7 @@ static int mov_write_tkhd_tag(AVIOContext *pb, MOVTrack *track, AVStream *st)
     int version = duration < INT32_MAX ? 0 : 1;
 
     (version == 1) ? avio_wb32(pb, 104) : avio_wb32(pb, 92); /* size */
-    put_tag(pb, "tkhd");
+    ffio_wfourcc(pb, "tkhd");
     avio_w8(pb, version);
     avio_wb24(pb, 0xf); /* flags (track enabled) */
     if (version == 1) {
@@ -1232,9 +1233,9 @@ static int mov_write_tkhd_tag(AVIOContext *pb, MOVTrack *track, AVStream *st)
 static int mov_write_edts_tag(AVIOContext *pb, MOVTrack *track)
 {
     avio_wb32(pb, 0x24); /* size  */
-    put_tag(pb, "edts");
+    ffio_wfourcc(pb, "edts");
     avio_wb32(pb, 0x1c); /* size  */
-    put_tag(pb, "elst");
+    ffio_wfourcc(pb, "elst");
     avio_wb32(pb, 0x0);
     avio_wb32(pb, 0x1);
 
@@ -1250,7 +1251,7 @@ static int mov_write_edts_tag(AVIOContext *pb, MOVTrack *track)
 static int mov_write_tref_tag(AVIOContext *pb, MOVTrack *track)
 {
     avio_wb32(pb, 20);   // size
-    put_tag(pb, "tref");
+    ffio_wfourcc(pb, "tref");
     avio_wb32(pb, 12);   // size (subatom)
     avio_wl32(pb, track->tref_tag);
     avio_wb32(pb, track->tref_id);
@@ -1261,13 +1262,13 @@ static int mov_write_tref_tag(AVIOContext *pb, MOVTrack *track)
 static int mov_write_uuid_tag_psp(AVIOContext *pb, MOVTrack *mov)
 {
     avio_wb32(pb, 0x34); /* size ... reports as 28 in mp4box! */
-    put_tag(pb, "uuid");
-    put_tag(pb, "USMT");
+    ffio_wfourcc(pb, "uuid");
+    ffio_wfourcc(pb, "USMT");
     avio_wb32(pb, 0x21d24fce);
     avio_wb32(pb, 0xbb88695c);
     avio_wb32(pb, 0xfac9c740);
     avio_wb32(pb, 0x1c);     // another size here!
-    put_tag(pb, "MTDT");
+    ffio_wfourcc(pb, "MTDT");
     avio_wb32(pb, 0x00010012);
     avio_wb32(pb, 0x0a);
     avio_wb32(pb, 0x55c40000);
@@ -1286,11 +1287,11 @@ static int mov_write_udta_sdp(AVIOContext *pb, AVCodecContext *ctx, int index)
     len = strlen(buf);
 
     avio_wb32(pb, len + 24);
-    put_tag (pb, "udta");
+    ffio_wfourcc(pb, "udta");
     avio_wb32(pb, len + 16);
-    put_tag (pb, "hnti");
+    ffio_wfourcc(pb, "hnti");
     avio_wb32(pb, len + 8);
-    put_tag (pb, "sdp ");
+    ffio_wfourcc(pb, "sdp ");
     avio_write(pb, buf, len);
     return len + 24;
 }
@@ -1299,7 +1300,7 @@ static int mov_write_trak_tag(AVIOContext *pb, MOVTrack *track, AVStream *st)
 {
     int64_t pos = url_ftell(pb);
     avio_wb32(pb, 0); /* size */
-    put_tag(pb, "trak");
+    ffio_wfourcc(pb, "trak");
     mov_write_tkhd_tag(pb, track, st);
     if (track->mode == MODE_PSP || track->flags & MOV_TRACK_CTTS)
         mov_write_edts_tag(pb, track);  // PSP Movies require edts box
@@ -1318,7 +1319,7 @@ static int mov_write_trak_tag(AVIOContext *pb, MOVTrack *track, AVStream *st)
 static int mov_write_iods_tag(AVIOContext *pb, MOVMuxContext *mov)
 {
     avio_wb32(pb, 0x15); /* size */
-    put_tag(pb, "iods");
+    ffio_wfourcc(pb, "iods");
     avio_wb32(pb, 0);    /* version & flags */
     avio_wb16(pb, 0x1007);
     avio_w8(pb, 0);
@@ -1350,7 +1351,7 @@ static int mov_write_mvhd_tag(AVIOContext *pb, MOVMuxContext *mov)
 
     version = maxTrackLen < UINT32_MAX ? 0 : 1;
     (version == 1) ? avio_wb32(pb, 120) : avio_wb32(pb, 108); /* size */
-    put_tag(pb, "mvhd");
+    ffio_wfourcc(pb, "mvhd");
     avio_w8(pb, version);
     avio_wb24(pb, 0); /* flags */
     if (version == 1) {
@@ -1394,11 +1395,11 @@ static int mov_write_itunes_hdlr_tag(AVIOContext *pb, MOVMuxContext *mov,
                                      AVFormatContext *s)
 {
     avio_wb32(pb, 33); /* size */
-    put_tag(pb, "hdlr");
+    ffio_wfourcc(pb, "hdlr");
     avio_wb32(pb, 0);
     avio_wb32(pb, 0);
-    put_tag(pb, "mdir");
-    put_tag(pb, "appl");
+    ffio_wfourcc(pb, "mdir");
+    ffio_wfourcc(pb, "appl");
     avio_wb32(pb, 0);
     avio_wb32(pb, 0);
     avio_w8(pb, 0);
@@ -1411,7 +1412,7 @@ static int mov_write_string_data_tag(AVIOContext *pb, const char *data, int lang
     if(long_style){
         int size = 16 + strlen(data);
         avio_wb32(pb, size); /* size */
-        put_tag(pb, "data");
+        ffio_wfourcc(pb, "data");
         avio_wb32(pb, 1);
         avio_wb32(pb, 0);
         avio_write(pb, data, strlen(data));
@@ -1431,7 +1432,7 @@ static int mov_write_string_tag(AVIOContext *pb, const char *name, const char *v
     if (value && value[0]) {
         int64_t pos = url_ftell(pb);
         avio_wb32(pb, 0); /* size */
-        put_tag(pb, name);
+        ffio_wfourcc(pb, name);
         mov_write_string_data_tag(pb, value, lang, long_style);
         size= updateSize(pb, pos);
     }
@@ -1470,9 +1471,9 @@ static int mov_write_trkn_tag(AVIOContext *pb, MOVMuxContext *mov,
     int size = 0, track = t ? atoi(t->value) : 0;
     if (track) {
         avio_wb32(pb, 32); /* size */
-        put_tag(pb, "trkn");
+        ffio_wfourcc(pb, "trkn");
             avio_wb32(pb, 24); /* size */
-            put_tag(pb, "data");
+            ffio_wfourcc(pb, "data");
             avio_wb32(pb, 0);        // 8 bytes empty
             avio_wb32(pb, 0);
             avio_wb16(pb, 0);        // empty
@@ -1490,7 +1491,7 @@ static int mov_write_ilst_tag(AVIOContext *pb, MOVMuxContext *mov,
 {
     int64_t pos = url_ftell(pb);
     avio_wb32(pb, 0); /* size */
-    put_tag(pb, "ilst");
+    ffio_wfourcc(pb, "ilst");
     mov_write_string_metadata(s, pb, "\251nam", "title"    , 1);
     mov_write_string_metadata(s, pb, "\251ART", "artist"   , 1);
     mov_write_string_metadata(s, pb, "aART", "album_artist", 1);
@@ -1519,7 +1520,7 @@ static int mov_write_meta_tag(AVIOContext *pb, MOVMuxContext *mov,
     int size = 0;
     int64_t pos = url_ftell(pb);
     avio_wb32(pb, 0); /* size */
-    put_tag(pb, "meta");
+    ffio_wfourcc(pb, "meta");
     avio_wb32(pb, 0);
     mov_write_itunes_hdlr_tag(pb, mov, s);
     mov_write_ilst_tag(pb, mov, s);
@@ -1562,7 +1563,7 @@ static int mov_write_3gp_udta_tag(AVIOContext *pb, AVFormatContext *s,
     if (!t || !utf8len(t->value))
         return 0;
     avio_wb32(pb, 0);   /* size */
-    put_tag (pb, tag); /* type */
+    ffio_wfourcc(pb, tag); /* type */
     avio_wb32(pb, 0);   /* version + flags */
     if (!strcmp(tag, "yrrc"))
         avio_wb16(pb, atoi(t->value));
@@ -1582,7 +1583,7 @@ static int mov_write_chpl_tag(AVIOContext *pb, AVFormatContext *s)
     int i, nb_chapters = FFMIN(s->nb_chapters, 255);
 
     avio_wb32(pb, 0);            // size
-    put_tag (pb, "chpl");
+    ffio_wfourcc(pb, "chpl");
     avio_wb32(pb, 0x01000000);   // version + flags
     avio_wb32(pb, 0);            // unknown
     avio_w8(pb, nb_chapters);
@@ -1647,7 +1648,7 @@ static int mov_write_udta_tag(AVIOContext *pb, MOVMuxContext *mov,
 
     if ((size = url_close_dyn_buf(pb_buf, &buf)) > 0) {
         avio_wb32(pb, size+8);
-        put_tag(pb, "udta");
+        ffio_wfourcc(pb, "udta");
         avio_write(pb, buf, size);
     }
     av_free(buf);
@@ -1676,15 +1677,15 @@ static int mov_write_uuidusmt_tag(AVIOContext *pb, AVFormatContext *s)
     if (title) {
         pos = url_ftell(pb);
         avio_wb32(pb, 0); /* size placeholder*/
-        put_tag(pb, "uuid");
-        put_tag(pb, "USMT");
+        ffio_wfourcc(pb, "uuid");
+        ffio_wfourcc(pb, "USMT");
         avio_wb32(pb, 0x21d24fce); /* 96 bit UUID */
         avio_wb32(pb, 0xbb88695c);
         avio_wb32(pb, 0xfac9c740);
 
         pos2 = url_ftell(pb);
         avio_wb32(pb, 0); /* size placeholder*/
-        put_tag(pb, "MTDT");
+        ffio_wfourcc(pb, "MTDT");
         avio_wb16(pb, 4);
 
         // ?
@@ -1712,7 +1713,7 @@ static int mov_write_moov_tag(AVIOContext *pb, MOVMuxContext *mov,
     int i;
     int64_t pos = url_ftell(pb);
     avio_wb32(pb, 0); /* size placeholder*/
-    put_tag(pb, "moov");
+    ffio_wfourcc(pb, "moov");
 
     for (i=0; i<mov->nb_streams; i++) {
         if(mov->tracks[i].entry <= 0) continue;
@@ -1753,11 +1754,11 @@ static int mov_write_moov_tag(AVIOContext *pb, MOVMuxContext *mov,
 static int mov_write_mdat_tag(AVIOContext *pb, MOVMuxContext *mov)
 {
     avio_wb32(pb, 8);    // placeholder for extended size field (64 bit)
-    put_tag(pb, mov->mode == MODE_MOV ? "wide" : "free");
+    ffio_wfourcc(pb, mov->mode == MODE_MOV ? "wide" : "free");
 
     mov->mdat_pos = url_ftell(pb);
     avio_wb32(pb, 0); /* size placeholder*/
-    put_tag(pb, "mdat");
+    ffio_wfourcc(pb, "mdat");
     return 0;
 }
 
@@ -1779,42 +1780,42 @@ static int mov_write_ftyp_tag(AVIOContext *pb, AVFormatContext *s)
     }
 
     avio_wb32(pb, 0); /* size */
-    put_tag(pb, "ftyp");
+    ffio_wfourcc(pb, "ftyp");
 
     if (mov->mode == MODE_3GP) {
-        put_tag(pb, has_h264 ? "3gp6"  : "3gp4");
+        ffio_wfourcc(pb, has_h264 ? "3gp6"  : "3gp4");
         minor =     has_h264 ?   0x100 :   0x200;
     } else if (mov->mode & MODE_3G2) {
-        put_tag(pb, has_h264 ? "3g2b"  : "3g2a");
+        ffio_wfourcc(pb, has_h264 ? "3g2b"  : "3g2a");
         minor =     has_h264 ? 0x20000 : 0x10000;
     }else if (mov->mode == MODE_PSP)
-        put_tag(pb, "MSNV");
+        ffio_wfourcc(pb, "MSNV");
     else if (mov->mode == MODE_MP4)
-        put_tag(pb, "isom");
+        ffio_wfourcc(pb, "isom");
     else if (mov->mode == MODE_IPOD)
-        put_tag(pb, has_video ? "M4V ":"M4A ");
+        ffio_wfourcc(pb, has_video ? "M4V ":"M4A ");
     else
-        put_tag(pb, "qt  ");
+        ffio_wfourcc(pb, "qt  ");
 
     avio_wb32(pb, minor);
 
     if(mov->mode == MODE_MOV)
-        put_tag(pb, "qt  ");
+        ffio_wfourcc(pb, "qt  ");
     else{
-        put_tag(pb, "isom");
-        put_tag(pb, "iso2");
+        ffio_wfourcc(pb, "isom");
+        ffio_wfourcc(pb, "iso2");
         if(has_h264)
-            put_tag(pb, "avc1");
+            ffio_wfourcc(pb, "avc1");
     }
 
     if (mov->mode == MODE_3GP)
-        put_tag(pb, has_h264 ? "3gp6":"3gp4");
+        ffio_wfourcc(pb, has_h264 ? "3gp6":"3gp4");
     else if (mov->mode & MODE_3G2)
-        put_tag(pb, has_h264 ? "3g2b":"3g2a");
+        ffio_wfourcc(pb, has_h264 ? "3g2b":"3g2a");
     else if (mov->mode == MODE_PSP)
-        put_tag(pb, "MSNV");
+        ffio_wfourcc(pb, "MSNV");
     else if (mov->mode == MODE_MP4)
-        put_tag(pb, "mp41");
+        ffio_wfourcc(pb, "mp41");
     return updateSize(pb, pos);
 }
 
@@ -1828,8 +1829,8 @@ static void mov_write_uuidprof_tag(AVIOContext *pb, AVFormatContext *s)
     int video_kbitrate= FFMIN(VideoCodec->bit_rate / 1000, 800 - audio_kbitrate);
 
     avio_wb32(pb, 0x94); /* size */
-    put_tag(pb, "uuid");
-    put_tag(pb, "PROF");
+    ffio_wfourcc(pb, "uuid");
+    ffio_wfourcc(pb, "PROF");
 
     avio_wb32(pb, 0x21d24fce); /* 96 bit UUID */
     avio_wb32(pb, 0xbb88695c);
@@ -1839,16 +1840,16 @@ static void mov_write_uuidprof_tag(AVIOContext *pb, AVFormatContext *s)
     avio_wb32(pb, 0x3);  /* 3 sections ? */
 
     avio_wb32(pb, 0x14); /* size */
-    put_tag(pb, "FPRF");
+    ffio_wfourcc(pb, "FPRF");
     avio_wb32(pb, 0x0);  /* ? */
     avio_wb32(pb, 0x0);  /* ? */
     avio_wb32(pb, 0x0);  /* ? */
 
     avio_wb32(pb, 0x2c);  /* size */
-    put_tag(pb, "APRF");   /* audio */
+    ffio_wfourcc(pb, "APRF");/* audio */
     avio_wb32(pb, 0x0);
     avio_wb32(pb, 0x2);   /* TrackID */
-    put_tag(pb, "mp4a");
+    ffio_wfourcc(pb, "mp4a");
     avio_wb32(pb, 0x20f);
     avio_wb32(pb, 0x0);
     avio_wb32(pb, audio_kbitrate);
@@ -1857,15 +1858,15 @@ static void mov_write_uuidprof_tag(AVIOContext *pb, AVFormatContext *s)
     avio_wb32(pb, AudioCodec->channels);
 
     avio_wb32(pb, 0x34);  /* size */
-    put_tag(pb, "VPRF");   /* video */
+    ffio_wfourcc(pb, "VPRF");   /* video */
     avio_wb32(pb, 0x0);
     avio_wb32(pb, 0x1);    /* TrackID */
     if (VideoCodec->codec_id == CODEC_ID_H264) {
-        put_tag(pb, "avc1");
+        ffio_wfourcc(pb, "avc1");
         avio_wb16(pb, 0x014D);
         avio_wb16(pb, 0x0015);
     } else {
-        put_tag(pb, "mp4v");
+        ffio_wfourcc(pb, "mp4v");
         avio_wb16(pb, 0x0000);
         avio_wb16(pb, 0x0103);
     }
@@ -2206,7 +2207,7 @@ static int mov_write_trailer(AVFormatContext *s)
         /* overwrite 'wide' placeholder atom */
         url_fseek(pb, mov->mdat_pos - 8, SEEK_SET);
         avio_wb32(pb, 1); /* special value: real atom size will be 64 bit value after tag field */
-        put_tag(pb, "mdat");
+        ffio_wfourcc(pb, "mdat");
         avio_wb64(pb, mov->mdat_size+16);
     }
     url_fseek(pb, moov_pos, SEEK_SET);
diff --git a/libavformat/oggenc.c b/libavformat/oggenc.c
index 533f89e7b8..fc4010d3b8 100644
--- a/libavformat/oggenc.c
+++ b/libavformat/oggenc.c
@@ -25,6 +25,7 @@
 #include "libavcodec/bytestream.h"
 #include "libavcodec/flac.h"
 #include "avformat.h"
+#include "avio_internal.h"
 #include "internal.h"
 #include "vorbiscomment.h"
 
@@ -85,7 +86,7 @@ static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
     if (ret < 0)
         return ret;
     init_checksum(pb, ff_crc04C11DB7_update, 0);
-    put_tag(pb, "OggS");
+    ffio_wfourcc(pb, "OggS");
     avio_w8(pb, 0);
     avio_w8(pb, page->flags | extra_flags);
     avio_wl64(pb, page->granule);
diff --git a/libavformat/riff.c b/libavformat/riff.c
index 4cbc2b7f0a..4e21b1c841 100644
--- a/libavformat/riff.c
+++ b/libavformat/riff.c
@@ -21,6 +21,7 @@
 
 #include "libavcodec/avcodec.h"
 #include "avformat.h"
+#include "avio_internal.h"
 #include "riff.h"
 #include "libavcodec/bytestream.h"
 
@@ -321,7 +322,7 @@ const AVCodecTag ff_codec_wav_tags[] = {
 #if CONFIG_MUXERS
 int64_t ff_start_tag(AVIOContext *pb, const char *tag)
 {
-    put_tag(pb, tag);
+    ffio_wfourcc(pb, tag);
     avio_wl32(pb, 0);
     return url_ftell(pb);
 }
diff --git a/libavformat/rmenc.c b/libavformat/rmenc.c
index 6ba152e45c..5d311d3599 100644
--- a/libavformat/rmenc.c
+++ b/libavformat/rmenc.c
@@ -19,6 +19,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include "avformat.h"
+#include "avio_internal.h"
 #include "rm.h"
 
 typedef struct {
@@ -74,13 +75,13 @@ static int rv10_write_header(AVFormatContext *ctx,
 
     start_ptr = s->buf_ptr;
 
-    put_tag(s, ".RMF");
+    ffio_wfourcc(s, ".RMF");
     avio_wb32(s,18); /* header size */
     avio_wb16(s,0);
     avio_wb32(s,0);
     avio_wb32(s,4 + ctx->nb_streams); /* num headers */
 
-    put_tag(s,"PROP");
+    ffio_wfourcc(s,"PROP");
     avio_wb32(s, 50);
     avio_wb16(s, 0);
     packet_max_size = 0;
@@ -123,7 +124,7 @@ static int rv10_write_header(AVFormatContext *ctx,
 
     /* comments */
 
-    put_tag(s,"CONT");
+    ffio_wfourcc(s,"CONT");
     size =  4 * 2 + 10;
     for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
         tag = av_metadata_get(ctx->metadata, ff_rm_metadata[i], NULL, 0);
@@ -151,7 +152,7 @@ static int rv10_write_header(AVFormatContext *ctx,
             codec_data_size = 34;
         }
 
-        put_tag(s,"MDPR");
+        ffio_wfourcc(s,"MDPR");
         size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size;
         avio_wb32(s, size);
         avio_wb16(s, 0);
@@ -186,7 +187,7 @@ static int rv10_write_header(AVFormatContext *ctx,
             put_tag(s, ".ra");
             avio_w8(s, 0xfd);
             avio_wb32(s, 0x00040000); /* version */
-            put_tag(s, ".ra4");
+            ffio_wfourcc(s, ".ra4");
             avio_wb32(s, 0x01b53530); /* stream length */
             avio_wb16(s, 4); /* unknown */
             avio_wb32(s, 0x39); /* header size */
@@ -239,10 +240,11 @@ static int rv10_write_header(AVFormatContext *ctx,
         } else {
             /* video codec info */
             avio_wb32(s,34); /* size */
+            ffio_wfourcc(s, "VIDO");
             if(stream->enc->codec_id == CODEC_ID_RV10)
-                put_tag(s,"VIDORV10");
+                ffio_wfourcc(s,"RV10");
             else
-                put_tag(s,"VIDORV20");
+                ffio_wfourcc(s,"RV20");
             avio_wb16(s, stream->enc->width);
             avio_wb16(s, stream->enc->height);
             avio_wb16(s, (int) stream->frame_rate); /* frames per seconds ? */
@@ -270,7 +272,7 @@ static int rv10_write_header(AVFormatContext *ctx,
     data_offset_ptr[3] = data_pos;
 
     /* data stream */
-    put_tag(s,"DATA");
+    ffio_wfourcc(s, "DATA");
     avio_wb32(s,data_size + 10 + 8);
     avio_wb16(s,0);
 
diff --git a/libavformat/soxenc.c b/libavformat/soxenc.c
index 75141de789..9c06dd7ea3 100644
--- a/libavformat/soxenc.c
+++ b/libavformat/soxenc.c
@@ -31,6 +31,7 @@
 
 #include "libavutil/intreadwrite.h"
 #include "avformat.h"
+#include "avio_internal.h"
 #include "sox.h"
 
 typedef struct {
@@ -53,14 +54,14 @@ static int sox_write_header(AVFormatContext *s)
     sox->header_size = SOX_FIXED_HDR + comment_size;
 
     if (enc->codec_id == CODEC_ID_PCM_S32LE) {
-        put_tag(pb, ".SoX");
+        ffio_wfourcc(pb, ".SoX");
         avio_wl32(pb, sox->header_size);
         avio_wl64(pb, 0); /* number of samples */
         avio_wl64(pb, av_dbl2int(enc->sample_rate));
         avio_wl32(pb, enc->channels);
         avio_wl32(pb, comment_size);
     } else if (enc->codec_id == CODEC_ID_PCM_S32BE) {
-        put_tag(pb, "XoS.");
+        ffio_wfourcc(pb, "XoS.");
         avio_wb32(pb, sox->header_size);
         avio_wb64(pb, 0); /* number of samples */
         avio_wb64(pb, av_dbl2int(enc->sample_rate));
diff --git a/libavformat/wav.c b/libavformat/wav.c
index dea70fa4dc..a574b3b16f 100644
--- a/libavformat/wav.c
+++ b/libavformat/wav.c
@@ -23,6 +23,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include "avformat.h"
+#include "avio_internal.h"
 #include "pcm.h"
 #include "riff.h"
 
@@ -42,9 +43,9 @@ static int wav_write_header(AVFormatContext *s)
     AVIOContext *pb = s->pb;
     int64_t fmt, fact;
 
-    put_tag(pb, "RIFF");
+    ffio_wfourcc(pb, "RIFF");
     avio_wl32(pb, 0); /* file length */
-    put_tag(pb, "WAVE");
+    ffio_wfourcc(pb, "WAVE");
 
     /* format header */
     fmt = ff_start_tag(pb, "fmt ");