Merge remote branch 'qatar/master'

* qatar/master:
  fate: fix partial run when no samples path is specified
  ARM: NEON fixed-point forward MDCT
  ARM: NEON fixed-point FFT
  lavf: bump minor version and add an APIChanges entry for avio changes
  avio: simplify url_open_dyn_buf_internal by using avio_alloc_context()
  avio: make url_fdopen internal.
  avio: make url_open_dyn_packet_buf internal.
  avio: avio_ prefix for url_close_dyn_buf
  avio: avio_ prefix for url_open_dyn_buf
  avio: introduce an AVIOContext.seekable field
  ac3enc: use generic fixed-point mdct
  lavfi: add fade filter
  Change yadif to not use out of picture lines.
  lavc: deprecate AVCodecContext.antialias_algo
  lavc: mark mb_qmin/mb_qmax for removal on next major bump.

Conflicts:
	doc/filters.texi
	libavcodec/ac3enc_fixed.h
	libavcodec/ac3enc_float.h
	libavfilter/Makefile
	libavfilter/allfilters.c
	libavfilter/vf_fade.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>

54 files changed, 221 insertions, 187 deletions

diff --git a/libavformat/aiffdec.c b/libavformat/aiffdec.c
index c43ee32adc..25a93f5fb9 100644
--- a/libavformat/aiffdec.c
+++ b/libavformat/aiffdec.c
@@ -238,7 +238,7 @@ static int aiff_read_header(AVFormatContext *s,
             offset += avio_tell(pb);    /* Compute absolute data offset */
             if (st->codec->block_align)    /* Assume COMM already parsed */
                 goto got_sound;
-            if (url_is_streamed(pb)) {
+            if (!pb->seekable) {
                 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
                 return -1;
             }
diff --git a/libavformat/aiffenc.c b/libavformat/aiffenc.c
index 6fc09aeb63..cc3cbc4762 100644
--- a/libavformat/aiffenc.c
+++ b/libavformat/aiffenc.c
@@ -124,7 +124,7 @@ static int aiff_write_trailer(AVFormatContext *s)
         end_size++;
     }
 
-    if (!url_is_streamed(s->pb)) {
+    if (s->pb->seekable) {
         /* File length */
         avio_seek(pb, aiff->form, SEEK_SET);
         avio_wb32(pb, file_size - aiff->form - 4);
diff --git a/libavformat/ape.c b/libavformat/ape.c
index 28b80b25aa..d63b2ac40d 100644
--- a/libavformat/ape.c
+++ b/libavformat/ape.c
@@ -296,7 +296,7 @@ static int ape_read_header(AVFormatContext * s, AVFormatParameters * ap)
     ape_dumpinfo(s, ape);
 
     /* try to read APE tags */
-    if (!url_is_streamed(pb)) {
+    if (pb->seekable) {
         ff_ape_parse_tag(s);
         avio_seek(pb, 0, SEEK_SET);
     }
diff --git a/libavformat/asfenc.c b/libavformat/asfenc.c
index 36b9472018..fe5a67ce4b 100644
--- a/libavformat/asfenc.c
+++ b/libavformat/asfenc.c
@@ -234,11 +234,11 @@ static void put_str16(AVIOContext *s, const char *tag)
     int len;
     uint8_t *pb;
     AVIOContext *dyn_buf;
-    if (url_open_dyn_buf(&dyn_buf) < 0)
+    if (avio_open_dyn_buf(&dyn_buf) < 0)
         return;
 
     avio_put_str16le(dyn_buf, tag);
-    len = url_close_dyn_buf(dyn_buf, &pb);
+    len = avio_close_dyn_buf(dyn_buf, &pb);
     avio_wl16(s, len);
     avio_write(s, pb, len);
     av_freep(&pb);
@@ -347,7 +347,7 @@ static int asf_write_header1(AVFormatContext *s, int64_t file_size, int64_t data
     avio_wl64(pb, duration); /* end time stamp (in 100ns units) */
     avio_wl64(pb, asf->duration); /* duration (in 100ns units) */
     avio_wl64(pb, PREROLL_TIME); /* start time stamp */
-    avio_wl32(pb, (asf->is_streamed || url_is_streamed(pb)) ? 3 : 2); /* ??? */
+    avio_wl32(pb, (asf->is_streamed || !pb->seekable ) ? 3 : 2); /* ??? */
     avio_wl32(pb, s->packet_size); /* packet size */
     avio_wl32(pb, s->packet_size); /* packet size */
     avio_wl32(pb, bit_rate); /* Nominal data rate in bps */
@@ -366,7 +366,7 @@ static int asf_write_header1(AVFormatContext *s, int64_t file_size, int64_t data
         uint8_t *buf;
         AVIOContext *dyn_buf;
 
-        if (url_open_dyn_buf(&dyn_buf) < 0)
+        if (avio_open_dyn_buf(&dyn_buf) < 0)
             return AVERROR(ENOMEM);
 
         hpos = put_header(pb, &ff_asf_comment_header);
@@ -375,7 +375,7 @@ static int asf_write_header1(AVFormatContext *s, int64_t file_size, int64_t data
             len = tags[n] ? avio_put_str16le(dyn_buf, tags[n]->value) : 0;
             avio_wl16(pb, len);
         }
-        len = url_close_dyn_buf(dyn_buf, &buf);
+        len = avio_close_dyn_buf(dyn_buf, &buf);
         avio_write(pb, buf, len);
         av_freep(&buf);
         end_header(pb, hpos);
@@ -497,11 +497,11 @@ static int asf_write_header1(AVFormatContext *s, int64_t file_size, int64_t data
         else
             desc = p ? p->name : enc->codec_name;
 
-        if ( url_open_dyn_buf(&dyn_buf) < 0)
+        if ( avio_open_dyn_buf(&dyn_buf) < 0)
             return AVERROR(ENOMEM);
 
         avio_put_str16le(dyn_buf, desc);
-        len = url_close_dyn_buf(dyn_buf, &buf);
+        len = avio_close_dyn_buf(dyn_buf, &buf);
         avio_wl16(pb, len / 2); // "number of characters" = length in bytes / 2
 
         avio_write(pb, buf, len);
@@ -866,7 +866,7 @@ static int asf_write_trailer(AVFormatContext *s)
     }
     avio_flush(s->pb);
 
-    if (asf->is_streamed || url_is_streamed(s->pb)) {
+    if (asf->is_streamed || !s->pb->seekable) {
         put_chunk(s, 0x4524, 0, 0); /* end of stream */
     } else {
         /* rewrite an updated header */
diff --git a/libavformat/au.c b/libavformat/au.c
index 9c674ac6f6..23365c4734 100644
--- a/libavformat/au.c
+++ b/libavformat/au.c
@@ -91,7 +91,7 @@ static int au_write_trailer(AVFormatContext *s)
     AVIOContext *pb = s->pb;
     int64_t file_size;
 
-    if (!url_is_streamed(s->pb)) {
+    if (s->pb->seekable) {
 
         /* update file size */
         file_size = avio_tell(pb);
diff --git a/libavformat/avc.c b/libavformat/avc.c
index a39343b1ca..ed2125b527 100644
--- a/libavformat/avc.c
+++ b/libavformat/avc.c
@@ -89,14 +89,14 @@ int ff_avc_parse_nal_units(AVIOContext *pb, const uint8_t *buf_in, int size)
 int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size)
 {
     AVIOContext *pb;
-    int ret = url_open_dyn_buf(&pb);
+    int ret = avio_open_dyn_buf(&pb);
     if(ret < 0)
         return ret;
 
     ff_avc_parse_nal_units(pb, buf_in, *size);
 
     av_freep(buf);
-    *size = url_close_dyn_buf(pb, buf);
+    *size = avio_close_dyn_buf(pb, buf);
     return 0;
 }
 
diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index b605c45d2b..ad0d098a12 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -665,7 +665,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
             break;
         case MKTAG('i', 'n', 'd', 'x'):
             i= avio_tell(pb);
-            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
+            if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX)){
                 read_braindead_odml_indx(s, 0);
             }
             avio_seek(pb, i+size, SEEK_SET);
@@ -721,7 +721,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
         return -1;
     }
 
-    if(!avi->index_loaded && !url_is_streamed(pb))
+    if(!avi->index_loaded && pb->seekable)
         avi_load_index(s);
     avi->index_loaded = 1;
     avi->non_interleaved |= guess_ni_flag(s);
diff --git a/libavformat/avienc.c b/libavformat/avienc.c
index 3743abb8d7..ff74c3b492 100644
--- a/libavformat/avienc.c
+++ b/libavformat/avienc.c
@@ -197,7 +197,7 @@ static int avi_write_header(AVFormatContext *s)
     }
     avio_wl32(pb, bitrate / 8); /* XXX: not quite exact */
     avio_wl32(pb, 0); /* padding */
-    if (url_is_streamed(pb))
+    if (!pb->seekable)
         avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_ISINTERLEAVED); /* flags */
     else
         avio_wl32(pb, AVIF_TRUSTCKTYPE | AVIF_HASINDEX | AVIF_ISINTERLEAVED); /* flags */
@@ -259,7 +259,7 @@ static int avi_write_header(AVFormatContext *s)
 
         avio_wl32(pb, 0); /* start */
         avist->frames_hdr_strm = avio_tell(pb); /* remember this offset to fill later */
-        if (url_is_streamed(pb))
+        if (!pb->seekable)
             avio_wl32(pb, AVI_MAX_RIFF_SIZE); /* FIXME: this may be broken, but who cares */
         else
             avio_wl32(pb, 0); /* length, XXX: filled later */
@@ -303,7 +303,7 @@ static int avi_write_header(AVFormatContext *s)
         }
       }
 
-        if (!url_is_streamed(pb)) {
+        if (pb->seekable) {
             unsigned char tag[5];
             int j;
 
@@ -362,7 +362,7 @@ static int avi_write_header(AVFormatContext *s)
         ff_end_tag(pb, list2);
     }
 
-    if (!url_is_streamed(pb)) {
+    if (pb->seekable) {
         /* AVI could become an OpenDML one, if it grows beyond 2Gb range */
         avi->odml_list = ff_start_tag(pb, "JUNK");
         ffio_wfourcc(pb, "odml");
@@ -406,7 +406,7 @@ static int avi_write_ix(AVFormatContext *s)
     char ix_tag[] = "ix00";
     int i, j;
 
-    assert(!url_is_streamed(pb));
+    assert(pb->seekable);
 
     if (avi->riff_id > AVI_MASTER_INDEX_SIZE)
         return -1;
@@ -464,7 +464,7 @@ static int avi_write_idx1(AVFormatContext *s)
     int i;
     char tag[5];
 
-    if (!url_is_streamed(pb)) {
+    if (pb->seekable) {
         AVIStream *avist;
         AVIIentry* ie = 0, *tie;
         int empty, stream_id = -1;
@@ -532,7 +532,7 @@ static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
     avist->packet_count++;
 
     // Make sure to put an OpenDML chunk when the file size exceeds the limits
-    if (!url_is_streamed(pb) &&
+    if (pb->seekable &&
         (avio_tell(pb) - avi->riff_start > AVI_MAX_RIFF_SIZE)) {
 
         avi_write_ix(s);
@@ -552,7 +552,7 @@ static int avi_write_packet(AVFormatContext *s, AVPacket *pkt)
        avist->audio_strm_length += size;
     }
 
-    if (!url_is_streamed(s->pb)) {
+    if (s->pb->seekable) {
         AVIIndex* idx = &avist->indexes;
         int cl = idx->entry / AVI_INDEX_CLUSTER_SIZE;
         int id = idx->entry % AVI_INDEX_CLUSTER_SIZE;
@@ -590,7 +590,7 @@ static int avi_write_trailer(AVFormatContext *s)
     int i, j, n, nb_frames;
     int64_t file_size;
 
-    if (!url_is_streamed(pb)){
+    if (pb->seekable){
         if (avi->riff_id == 1) {
             ff_end_tag(pb, avi->movi_list);
             res = avi_write_idx1(s);
diff --git a/libavformat/avio.h b/libavformat/avio.h
index 710246854b..19b57b2261 100644
--- a/libavformat/avio.h
+++ b/libavformat/avio.h
@@ -332,6 +332,8 @@ attribute_deprecated int av_register_protocol(URLProtocol *protocol);
  */
 int av_register_protocol2(URLProtocol *protocol, int size);
 
+#define AVIO_SEEKABLE_NORMAL 0x0001 /**< Seeking works like for a local file */
+
 /**
  * Bytestream IO Context.
  * New fields can be added to the end with minor version bumps.
@@ -351,7 +353,9 @@ typedef struct {
     int must_flush; /**< true if the next seek should flush */
     int eof_reached; /**< true if eof reached */
     int write_flag;  /**< true if open for writing */
-    int is_streamed;
+#if FF_API_OLD_AVIO
+    attribute_deprecated int is_streamed;
+#endif
     int max_packet_size;
     unsigned long checksum;
     unsigned char *checksum_ptr;
@@ -360,6 +364,10 @@ typedef struct {
     int (*read_pause)(void *opaque, int pause);
     int64_t (*read_seek)(void *opaque, int stream_index,
                          int64_t timestamp, int flags);
+    /**
+     * A combination of AVIO_SEEKABLE_ flags or 0 when the stream is not seekable.
+     */
+    int seekable;
 } AVIOContext;
 
 #if FF_API_OLD_AVIO
@@ -439,6 +447,10 @@ attribute_deprecated int url_fprintf(AVIOContext *s, const char *fmt, ...) __att
 attribute_deprecated int url_fprintf(AVIOContext *s, const char *fmt, ...);
 #endif
 attribute_deprecated void put_flush_packet(AVIOContext *s);
+attribute_deprecated int url_open_dyn_buf(AVIOContext **s);
+attribute_deprecated int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
+attribute_deprecated int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer);
+attribute_deprecated int url_fdopen(AVIOContext **s, URLContext *h);
 /**
  * @}
  */
@@ -603,23 +615,15 @@ unsigned int avio_rb24(AVIOContext *s);
 unsigned int avio_rb32(AVIOContext *s);
 uint64_t     avio_rb64(AVIOContext *s);
 
-static inline int url_is_streamed(AVIOContext *s)
-{
-    return s->is_streamed;
-}
-
+#if FF_API_OLD_AVIO
 /**
- * Create and initialize a AVIOContext for accessing the
- * resource referenced by the URLContext h.
- * @note When the URLContext h has been opened in read+write mode, the
- * AVIOContext can be used only for writing.
- *
- * @param s Used to return the pointer to the created AVIOContext.
- * In case of failure the pointed to value is set to NULL.
- * @return 0 in case of success, a negative value corresponding to an
- * AVERROR code in case of failure
+ * @deprecated Use AVIOContext.seekable field directly.
  */
-int url_fdopen(AVIOContext **s, URLContext *h);
+attribute_deprecated static inline int url_is_streamed(AVIOContext *s)
+{
+    return !s->seekable;
+}
+#endif
 
 #if FF_API_URL_RESETBUF
 /** Reset the buffer for reading or writing.
@@ -666,30 +670,18 @@ attribute_deprecated int url_close_buf(AVIOContext *s);
  * @param s new IO context
  * @return zero if no error.
  */
-int url_open_dyn_buf(AVIOContext **s);
-
-/**
- * Open a write only packetized memory stream with a maximum packet
- * size of 'max_packet_size'.  The stream is stored in a memory buffer
- * with a big endian 4 byte header giving the packet size in bytes.
- *
- * @param s new IO context
- * @param max_packet_size maximum packet size (must be > 0)
- * @return zero if no error.
- */
-int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
+int avio_open_dyn_buf(AVIOContext **s);
 
 /**
  * Return the written size and a pointer to the buffer. The buffer
- * must be freed with av_free(). If the buffer is opened with
- * url_open_dyn_buf, then padding of FF_INPUT_BUFFER_PADDING_SIZE is
- * added; if opened with url_open_dyn_packet_buf, no padding is added.
+ * must be freed with av_free().
+ * Padding of FF_INPUT_BUFFER_PADDING_SIZE is added to the buffer.
  *
  * @param s IO context
  * @param pbuffer pointer to a byte buffer
  * @return the length of the byte buffer
  */
-int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer);
+int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer);
 
 #if FF_API_UDP_GET_FILE
 int udp_get_file_handle(URLContext *h);
diff --git a/libavformat/avio_internal.h b/libavformat/avio_internal.h
index 343a1185ea..bf2ddb2daf 100644
--- a/libavformat/avio_internal.h
+++ b/libavformat/avio_internal.h
@@ -81,4 +81,28 @@ unsigned long ffio_get_checksum(AVIOContext *s);
 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
                                     unsigned int len);
 
+/**
+ * Open a write only packetized memory stream with a maximum packet
+ * size of 'max_packet_size'.  The stream is stored in a memory buffer
+ * with a big endian 4 byte header giving the packet size in bytes.
+ *
+ * @param s new IO context
+ * @param max_packet_size maximum packet size (must be > 0)
+ * @return zero if no error.
+ */
+int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
+
+/**
+ * Create and initialize a AVIOContext for accessing the
+ * resource referenced by the URLContext h.
+ * @note When the URLContext h has been opened in read+write mode, the
+ * AVIOContext can be used only for writing.
+ *
+ * @param s Used to return the pointer to the created AVIOContext.
+ * In case of failure the pointed to value is set to NULL.
+ * @return 0 in case of success, a negative value corresponding to an
+ * AVERROR code in case of failure
+ */
+int ffio_fdopen(AVIOContext **s, URLContext *h);
+
 #endif // AVFORMAT_AVIO_INTERNAL_H
diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index 9ba82d3e94..5396eb1635 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -62,7 +62,10 @@ int ffio_init_context(AVIOContext *s,
     s->must_flush = 0;
     s->eof_reached = 0;
     s->error = 0;
+#if FF_API_OLD_AVIO
     s->is_streamed = 0;
+#endif
+    s->seekable = AVIO_SEEKABLE_NORMAL;
     s->max_packet_size = 0;
     s->update_checksum= NULL;
     if(!read_packet && !write_flag){
@@ -202,7 +205,7 @@ int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
         offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
         /* can do the seek inside the buffer */
         s->buf_ptr = s->buffer + offset1;
-    } else if ((s->is_streamed ||
+    } else if ((!s->seekable ||
                offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) &&
                !s->write_flag && offset1 >= 0 &&
               (whence != SEEK_END || force)) {
@@ -425,6 +428,22 @@ unsigned long get_checksum(AVIOContext *s)
 {
     return ffio_get_checksum(s);
 }
+int url_open_dyn_buf(AVIOContext **s)
+{
+    return avio_open_dyn_buf(s);
+}
+int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
+{
+    return ffio_open_dyn_packet_buf(s, max_packet_size);
+}
+int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
+{
+    return avio_close_dyn_buf(s, pbuffer);
+}
+int url_fdopen(AVIOContext **s, URLContext *h)
+{
+    return ffio_fdopen(s, h);
+}
 #endif
 
 int avio_put_str(AVIOContext *s, const char *str)
@@ -812,7 +831,7 @@ uint64_t ffio_read_varlen(AVIOContext *bc){
     return val;
 }
 
-int url_fdopen(AVIOContext **s, URLContext *h)
+int ffio_fdopen(AVIOContext **s, URLContext *h)
 {
     uint8_t *buffer;
     int buffer_size, max_packet_size;
@@ -840,7 +859,10 @@ int url_fdopen(AVIOContext **s, URLContext *h)
         av_freep(s);
         return AVERROR(EIO);
     }
+#if FF_API_OLD_AVIO
     (*s)->is_streamed = h->is_streamed;
+#endif
+    (*s)->seekable = h->is_streamed ? 0 : AVIO_SEEKABLE_NORMAL;
     (*s)->max_packet_size = max_packet_size;
     if(h->prot) {
         (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
@@ -934,7 +956,7 @@ int avio_open(AVIOContext **s, const char *filename, int flags)
     err = url_open(&h, filename, flags);
     if (err < 0)
         return err;
-    err = url_fdopen(s, h);
+    err = ffio_fdopen(s, h);
     if (err < 0) {
         url_close(h);
         return err;
@@ -1026,7 +1048,7 @@ int64_t ffio_read_seek(AVIOContext *s, int stream_index,
     return ret;
 }
 
-/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
+/* avio_open_dyn_buf and avio_close_dyn_buf are used in rtp.c to send a response
  * back to the server even if CONFIG_MUXERS is false. */
 #if CONFIG_MUXERS || CONFIG_NETWORK
 /* buffer handling */
@@ -1123,7 +1145,6 @@ static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
 static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
 {
     DynBuffer *d;
-    int ret;
     unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
 
     if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
@@ -1131,38 +1152,31 @@ static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
     d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
     if (!d)
         return AVERROR(ENOMEM);
-    *s = av_mallocz(sizeof(AVIOContext));
+    d->io_buffer_size = io_buffer_size;
+    *s = avio_alloc_context(d->io_buffer, d->io_buffer_size, 1, d, NULL,
+                            max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
+                            max_packet_size ? NULL : dyn_buf_seek);
     if(!*s) {
         av_free(d);
         return AVERROR(ENOMEM);
     }
-    d->io_buffer_size = io_buffer_size;
-    ret = ffio_init_context(*s, d->io_buffer, io_buffer_size,
-                        1, d, NULL,
-                        max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
-                        max_packet_size ? NULL : dyn_buf_seek);
-    if (ret == 0) {
-        (*s)->max_packet_size = max_packet_size;
-    } else {
-        av_free(d);
-        av_freep(s);
-    }
-    return ret;
+    (*s)->max_packet_size = max_packet_size;
+    return 0;
 }
 
-int url_open_dyn_buf(AVIOContext **s)
+int avio_open_dyn_buf(AVIOContext **s)
 {
     return url_open_dyn_buf_internal(s, 0);
 }
 
-int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
+int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
 {
     if (max_packet_size <= 0)
         return -1;
     return url_open_dyn_buf_internal(s, max_packet_size);
 }
 
-int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
+int avio_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
 {
     DynBuffer *d = s->opaque;
     int size;
diff --git a/libavformat/bink.c b/libavformat/bink.c
index 4622f89e5a..3bcaff3c51 100644
--- a/libavformat/bink.c
+++ b/libavformat/bink.c
@@ -247,7 +247,7 @@ static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, in
     BinkDemuxContext *bink = s->priv_data;
     AVStream *vst = s->streams[0];
 
-    if (url_is_streamed(s->pb))
+    if (!s->pb->seekable)
         return -1;
 
     /* seek to the first frame */
diff --git a/libavformat/cafdec.c b/libavformat/cafdec.c
index 217f4db633..16c4674589 100644
--- a/libavformat/cafdec.c
+++ b/libavformat/cafdec.c
@@ -223,7 +223,7 @@ static int read_header(AVFormatContext *s,
 
         /* stop at data chunk if seeking is not supported or
            data chunk size is unknown */
-        if (found_data && (caf->data_size < 0 || url_is_streamed(pb)))
+        if (found_data && (caf->data_size < 0 || !pb->seekable))
             break;
 
         tag  = avio_rb32(pb);
@@ -236,7 +236,7 @@ static int read_header(AVFormatContext *s,
             avio_skip(pb, 4); /* edit count */
             caf->data_start = avio_tell(pb);
             caf->data_size  = size < 0 ? -1 : size - 4;
-            if (caf->data_size > 0 && !url_is_streamed(pb))
+            if (caf->data_size > 0 && pb->seekable)
                 avio_skip(pb, caf->data_size);
             found_data = 1;
             break;
diff --git a/libavformat/ffmdec.c b/libavformat/ffmdec.c
index a54bee059d..a42bb69679 100644
--- a/libavformat/ffmdec.c
+++ b/libavformat/ffmdec.c
@@ -281,7 +281,7 @@ static int ffm_read_header(AVFormatContext *s, AVFormatParameters *ap)
         goto fail;
     ffm->write_index = avio_rb64(pb);
     /* get also filesize */
-    if (!url_is_streamed(pb)) {
+    if (pb->seekable) {
         ffm->file_size = avio_size(pb);
         if (ffm->write_index)
             adjust_write_index(s);
diff --git a/libavformat/filmstripdec.c b/libavformat/filmstripdec.c
index 46d0635e9d..60c17819e8 100644
--- a/libavformat/filmstripdec.c
+++ b/libavformat/filmstripdec.c
@@ -40,7 +40,7 @@ static int read_header(AVFormatContext *s,
     AVIOContext *pb = s->pb;
     AVStream *st;
 
-    if (url_is_streamed(s->pb))
+    if (!s->pb->seekable)
         return AVERROR(EIO);
 
     avio_seek(pb, avio_size(pb) - 36, SEEK_SET);
diff --git a/libavformat/flacenc.c b/libavformat/flacenc.c
index e7605f5b23..1674527816 100644
--- a/libavformat/flacenc.c
+++ b/libavformat/flacenc.c
@@ -98,7 +98,7 @@ static int flac_write_trailer(struct AVFormatContext *s)
     if (!ff_flac_is_extradata_valid(s->streams[0]->codec, &format, &streaminfo))
         return -1;
 
-    if (!url_is_streamed(pb)) {
+    if (pb->seekable) {
         /* rewrite the STREAMINFO header block data */
         file_size = avio_tell(pb);
         avio_seek(pb, 8, SEEK_SET);
diff --git a/libavformat/flvdec.c b/libavformat/flvdec.c
index ccaee9247a..a63fffdde9 100644
--- a/libavformat/flvdec.c
+++ b/libavformat/flvdec.c
@@ -428,7 +428,7 @@ static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
  }
 
     // if not streamed and no duration from metadata then seek to end to find the duration from the timestamps
-    if(!url_is_streamed(s->pb) && (!s->duration || s->duration==AV_NOPTS_VALUE)){
+    if(s->pb->seekable && (!s->duration || s->duration==AV_NOPTS_VALUE)){
         int size;
         const int64_t pos= avio_tell(s->pb);
         const int64_t fsize= avio_size(s->pb);
@@ -530,7 +530,7 @@ static int flv_read_seek2(AVFormatContext *s, int stream_index,
 
     if (ts - min_ts > (uint64_t)(max_ts - ts)) flags |= AVSEEK_FLAG_BACKWARD;
 
-    if (url_is_streamed(s->pb)) {
+    if (!s->pb->seekable) {
         if (stream_index < 0) {
             stream_index = av_find_default_stream_index(s);
             if (stream_index < 0)
diff --git a/libavformat/gxfenc.c b/libavformat/gxfenc.c
index e6c44d6fd9..08270c8f66 100644
--- a/libavformat/gxfenc.c
+++ b/libavformat/gxfenc.c
@@ -634,7 +634,7 @@ static int gxf_write_header(AVFormatContext *s)
     uint8_t tracks[255] = {0};
     int i, media_info = 0;
 
-    if (url_is_streamed(pb)) {
+    if (!pb->seekable) {
         av_log(s, AV_LOG_ERROR, "gxf muxer does not support streamed output, patch welcome");
         return -1;
     }
diff --git a/libavformat/id3v1.c b/libavformat/id3v1.c
index 365c3e0fab..37d46956ef 100644
--- a/libavformat/id3v1.c
+++ b/libavformat/id3v1.c
@@ -229,7 +229,7 @@ void ff_id3v1_read(AVFormatContext *s)
     uint8_t buf[ID3v1_TAG_SIZE];
     int64_t filesize, position = avio_tell(s->pb);
 
-    if (!url_is_streamed(s->pb)) {
+    if (s->pb->seekable) {
         /* XXX: change that */
         filesize = avio_size(s->pb);
         if (filesize > 128) {
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 3358e038f5..e69b848f78 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -1120,7 +1120,7 @@ static void matroska_execute_seekhead(MatroskaDemuxContext *matroska)
     int i;
 
     // we should not do any seeking in the streaming case
-    if (url_is_streamed(matroska->ctx->pb) ||
+    if (!matroska->ctx->pb->seekable ||
         (matroska->ctx->flags & AVFMT_FLAG_IGNIDX))
         return;
 
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 973f31c129..732a5855ab 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -455,7 +455,7 @@ static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecCo
     uint8_t *codecpriv;
     int ret, codecpriv_size;
 
-    ret = url_open_dyn_buf(&dyn_cp);
+    ret = avio_open_dyn_buf(&dyn_cp);
     if(ret < 0)
         return ret;
 
@@ -498,7 +498,7 @@ static int mkv_write_codecprivate(AVFormatContext *s, AVIOContext *pb, AVCodecCo
         ff_put_wav_header(dyn_cp, codec);
     }
 
-    codecpriv_size = url_close_dyn_buf(dyn_cp, &codecpriv);
+    codecpriv_size = avio_close_dyn_buf(dyn_cp, &codecpriv);
     if (codecpriv_size)
         put_ebml_binary(pb, MATROSKA_ID_CODECPRIVATE, codecpriv, codecpriv_size);
     av_free(codecpriv);
@@ -852,7 +852,7 @@ static int mkv_write_header(AVFormatContext *s)
         if (ret < 0) return ret;
     }
 
-    if (url_is_streamed(s->pb))
+    if (!s->pb->seekable)
         mkv_write_seekhead(pb, mkv->main_seekhead);
 
     mkv->cues = mkv_start_cues(mkv->segment_offset);
@@ -1007,7 +1007,7 @@ static void mkv_flush_dynbuf(AVFormatContext *s)
     if (!mkv->dyn_bc)
         return;
 
-    bufsize = url_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
+    bufsize = avio_close_dyn_buf(mkv->dyn_bc, &dyn_buf);
     avio_write(s->pb, dyn_buf, bufsize);
     av_free(dyn_buf);
     mkv->dyn_bc = NULL;
@@ -1028,9 +1028,9 @@ static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
         return AVERROR(EINVAL);
     }
 
-    if (url_is_streamed(s->pb)) {
+    if (!s->pb->seekable) {
         if (!mkv->dyn_bc)
-            url_open_dyn_buf(&mkv->dyn_bc);
+            avio_open_dyn_buf(&mkv->dyn_bc);
         pb = mkv->dyn_bc;
     }
 
@@ -1080,16 +1080,16 @@ static int mkv_copy_packet(MatroskaMuxContext *mkv, const AVPacket *pkt)
 static int mkv_write_packet(AVFormatContext *s, AVPacket *pkt)
 {
     MatroskaMuxContext *mkv = s->priv_data;
-    AVIOContext *pb = url_is_streamed(s->pb) ? mkv->dyn_bc : s->pb;
+    AVIOContext *pb = s->pb->seekable ? s->pb : mkv->dyn_bc;
     AVCodecContext *codec = s->streams[pkt->stream_index]->codec;
     int ret, keyframe = !!(pkt->flags & AV_PKT_FLAG_KEY);
     int64_t ts = mkv->tracks[pkt->stream_index].write_dts ? pkt->dts : pkt->pts;
-    int cluster_size = avio_tell(pb) - (url_is_streamed(s->pb) ? 0 : mkv->cluster_pos);
+    int cluster_size = avio_tell(pb) - (s->pb->seekable ? mkv->cluster_pos : 0);
 
     // start a new cluster every 5 MB or 5 sec, or 32k / 1 sec for streaming or
     // after 4k and on a keyframe
     if (mkv->cluster_pos &&
-        ((url_is_streamed(s->pb) && (cluster_size > 32*1024 || ts > mkv->cluster_pts + 1000))
+        ((!s->pb->seekable && (cluster_size > 32*1024 || ts > mkv->cluster_pts + 1000))
          ||                      cluster_size > 5*1024*1024 || ts > mkv->cluster_pts + 5000
          || (codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe && cluster_size > 4*1024))) {
         av_log(s, AV_LOG_DEBUG, "Starting new cluster at offset %" PRIu64
@@ -1143,7 +1143,7 @@ static int mkv_write_trailer(AVFormatContext *s)
         end_ebml_master(pb, mkv->cluster);
     }
 
-    if (!url_is_streamed(pb)) {
+    if (pb->seekable) {
         cuespos = mkv_write_cues(pb, mkv->cues, s->nb_streams);
 
         ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_CUES    , cuespos);
diff --git a/libavformat/mmf.c b/libavformat/mmf.c
index 4605bf7fbd..fc6fcc3caa 100644
--- a/libavformat/mmf.c
+++ b/libavformat/mmf.c
@@ -133,7 +133,7 @@ static int mmf_write_trailer(AVFormatContext *s)
     int64_t pos, size;
     int gatetime;
 
-    if (!url_is_streamed(s->pb)) {
+    if (s->pb->seekable) {
         /* Fill in length fields */
         end_tag_be(pb, mmf->awapos);
         end_tag_be(pb, mmf->atrpos);
diff --git a/libavformat/mov.c b/libavformat/mov.c
index c08b07e55d..a4cd4d6b28 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -304,7 +304,7 @@ static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)
             if (err < 0)
                 return err;
             if (c->found_moov && c->found_mdat &&
-                (url_is_streamed(pb) || start_pos + a.size == avio_size(pb)))
+                (!pb->seekable || start_pos + a.size == avio_size(pb)))
                 return 0;
             left = a.size - avio_tell(pb) + start_pos;
             if (left > 0) /* skip garbage at atom end */
@@ -2354,7 +2354,7 @@ static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)
 
     mov->fc = s;
     /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */
-    if(!url_is_streamed(pb))
+    if(pb->seekable)
         atom.size = avio_size(pb);
     else
         atom.size = INT64_MAX;
@@ -2370,7 +2370,7 @@ static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)
     }
     av_dlog(mov->fc, "on_parse_exit_offset=%lld\n", avio_tell(pb));
 
-    if (!url_is_streamed(pb) && mov->chapter_track > 0)
+    if (pb->seekable && mov->chapter_track > 0)
         mov_read_chapters(s);
 
     return 0;
@@ -2388,8 +2388,8 @@ static AVIndexEntry *mov_find_next_sample(AVFormatContext *s, AVStream **st)
             AVIndexEntry *current_sample = &avst->index_entries[msc->current_sample];
             int64_t dts = av_rescale(current_sample->timestamp, AV_TIME_BASE, msc->time_scale);
             av_dlog(s, "stream %d, sample %d, dts %"PRId64"\n", i, msc->current_sample, dts);
-            if (!sample || (url_is_streamed(s->pb) && current_sample->pos < sample->pos) ||
-                (!url_is_streamed(s->pb) &&
+            if (!sample || (!s->pb->seekable && current_sample->pos < sample->pos) ||
+                (s->pb->seekable &&
                  ((msc->pb != s->pb && dts < best_dts) || (msc->pb == s->pb &&
                  ((FFABS(best_dts - dts) <= AV_TIME_BASE && current_sample->pos < sample->pos) ||
                   (FFABS(best_dts - dts) > AV_TIME_BASE && dts < best_dts)))))) {
@@ -2413,7 +2413,7 @@ static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
     sample = mov_find_next_sample(s, &st);
     if (!sample) {
         mov->found_mdat = 0;
-        if (!url_is_streamed(s->pb) ||
+        if (s->pb->seekable||
             mov_read_default(mov, s->pb, (MOVAtom){ AV_RL32("root"), INT64_MAX }) < 0 ||
             url_feof(s->pb))
             return AVERROR_EOF;
diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index fe529179ee..599c913b35 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -1653,7 +1653,7 @@ static int mov_write_udta_tag(AVIOContext *pb, MOVMuxContext *mov,
             return 0;
         }
 
-    ret = url_open_dyn_buf(&pb_buf);
+    ret = avio_open_dyn_buf(&pb_buf);
     if(ret < 0)
         return ret;
 
@@ -1684,7 +1684,7 @@ static int mov_write_udta_tag(AVIOContext *pb, MOVMuxContext *mov,
         if (s->nb_chapters)
             mov_write_chpl_tag(pb_buf, s);
 
-    if ((size = url_close_dyn_buf(pb_buf, &buf)) > 0) {
+    if ((size = avio_close_dyn_buf(pb_buf, &buf)) > 0) {
         avio_wb32(pb, size+8);
         ffio_wfourcc(pb, "udta");
         avio_write(pb, buf, size);
@@ -1948,7 +1948,7 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
     unsigned int samplesInChunk = 0;
     int size= pkt->size;
 
-    if (url_is_streamed(s->pb)) return 0; /* Can't handle that */
+    if (!s->pb->seekable) return 0; /* Can't handle that */
     if (!size) return 0; /* Discard 0 sized packets */
 
     if (enc->codec_id == CODEC_ID_AMR_NB) {
@@ -2083,7 +2083,7 @@ static int mov_write_header(AVFormatContext *s)
     MOVMuxContext *mov = s->priv_data;
     int i, hint_track = 0;
 
-    if (url_is_streamed(s->pb)) {
+    if (!s->pb->seekable) {
         av_log(s, AV_LOG_ERROR, "muxer does not support non seekable output\n");
         return -1;
     }
diff --git a/libavformat/movenchint.c b/libavformat/movenchint.c
index 21793cdd47..4e69c73407 100644
--- a/libavformat/movenchint.c
+++ b/libavformat/movenchint.c
@@ -23,6 +23,7 @@
 #include "libavutil/intreadwrite.h"
 #include "internal.h"
 #include "rtpenc_chain.h"
+#include "avio_internal.h"
 
 int ff_mov_init_hinting(AVFormatContext *s, int index, int src_index)
 {
@@ -408,8 +409,8 @@ int ff_mov_add_hinted_packet(AVFormatContext *s, AVPacket *pkt,
 
     /* Fetch the output from the RTP muxer, open a new output buffer
      * for next time. */
-    size = url_close_dyn_buf(rtp_ctx->pb, &buf);
-    if ((ret = url_open_dyn_packet_buf(&rtp_ctx->pb,
+    size = avio_close_dyn_buf(rtp_ctx->pb, &buf);
+    if ((ret = ffio_open_dyn_packet_buf(&rtp_ctx->pb,
                                        RTP_MAX_PACKET_SIZE)) < 0)
         goto done;
 
@@ -417,14 +418,14 @@ int ff_mov_add_hinted_packet(AVFormatContext *s, AVPacket *pkt,
         goto done;
 
     /* Open a buffer for writing the hint */
-    if ((ret = url_open_dyn_buf(&hintbuf)) < 0)
+    if ((ret = avio_open_dyn_buf(&hintbuf)) < 0)
         goto done;
     av_init_packet(&hint_pkt);
     count = write_hint_packets(hintbuf, buf, size, trk, &hint_pkt.dts);
     av_freep(&buf);
 
     /* Write the hint data into the hint track */
-    hint_pkt.size = size = url_close_dyn_buf(hintbuf, &buf);
+    hint_pkt.size = size = avio_close_dyn_buf(hintbuf, &buf);
     hint_pkt.data = buf;
     hint_pkt.pts  = hint_pkt.dts;
     hint_pkt.stream_index = track_index;
@@ -448,7 +449,7 @@ void ff_mov_close_hinting(MOVTrack *track) {
         return;
     if (rtp_ctx->pb) {
         av_write_trailer(rtp_ctx);
-        url_close_dyn_buf(rtp_ctx->pb, &ptr);
+        avio_close_dyn_buf(rtp_ctx->pb, &ptr);
         av_free(ptr);
     }
     avformat_free_context(rtp_ctx);
diff --git a/libavformat/mp3enc.c b/libavformat/mp3enc.c
index 88b1475313..a19769bbb0 100644
--- a/libavformat/mp3enc.c
+++ b/libavformat/mp3enc.c
@@ -96,7 +96,7 @@ static int id3v2_put_ttag(AVFormatContext *s, const char *str1, const char *str2
     uint8_t *pb;
     int (*put)(AVIOContext*, const char*);
     AVIOContext *dyn_buf;
-    if (url_open_dyn_buf(&dyn_buf) < 0)
+    if (avio_open_dyn_buf(&dyn_buf) < 0)
         return AVERROR(ENOMEM);
 
     /* check if the strings are ASCII-only and use UTF16 only if
@@ -115,7 +115,7 @@ static int id3v2_put_ttag(AVFormatContext *s, const char *str1, const char *str2
     put(dyn_buf, str1);
     if (str2)
         put(dyn_buf, str2);
-    len = url_close_dyn_buf(dyn_buf, &pb);
+    len = avio_close_dyn_buf(dyn_buf, &pb);
 
     avio_wb32(s->pb, tag);
     id3v2_put_size(s, len);
diff --git a/libavformat/mpc.c b/libavformat/mpc.c
index b9c5dc993e..3544cf11cf 100644
--- a/libavformat/mpc.c
+++ b/libavformat/mpc.c
@@ -93,7 +93,7 @@ static int mpc_read_header(AVFormatContext *s, AVFormatParameters *ap)
     st->duration = c->fcount;
 
     /* try to read APE tags */
-    if (!url_is_streamed(s->pb)) {
+    if (s->pb->seekable) {
         int64_t pos = avio_tell(s->pb);
         ff_ape_parse_tag(s);
         if (!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
diff --git a/libavformat/mpeg.c b/libavformat/mpeg.c
index 47be6d2bbe..f9f818951f 100644
--- a/libavformat/mpeg.c
+++ b/libavformat/mpeg.c
@@ -403,7 +403,7 @@ static int mpegps_read_pes_header(AVFormatContext *s,
         int i;
         for(i=0; i<s->nb_streams; i++){
             if(startcode == s->streams[i]->id &&
-               !url_is_streamed(s->pb) /* index useless on streams anyway */) {
+               s->pb->seekable /* index useless on streams anyway */) {
                 ff_reduce_index(s, i);
                 av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
             }
diff --git a/libavformat/mxfenc.c b/libavformat/mxfenc.c
index 8cf5d93257..c6532a3427 100644
--- a/libavformat/mxfenc.c
+++ b/libavformat/mxfenc.c
@@ -1784,7 +1784,7 @@ static int mxf_write_footer(AVFormatContext *s)
     mxf_write_klv_fill(s);
     mxf_write_random_index_pack(s);
 
-    if (!url_is_streamed(s->pb)) {
+    if (s->pb->seekable) {
         avio_seek(pb, 0, SEEK_SET);
         if (mxf->edit_unit_byte_count) {
             mxf_write_partition(s, 1, 2, header_closed_partition_key, 1);
diff --git a/libavformat/nutdec.c b/libavformat/nutdec.c
index bd77f785dc..2957a2b173 100644
--- a/libavformat/nutdec.c
+++ b/libavformat/nutdec.c
@@ -653,7 +653,7 @@ static int nut_read_header(AVFormatContext *s, AVFormatParameters *ap)
 
     s->data_offset= pos-8;
 
-    if(!url_is_streamed(bc)){
+    if(bc->seekable){
         int64_t orig_pos= avio_tell(bc);
         find_and_decode_index(nut);
         avio_seek(bc, orig_pos, SEEK_SET);
diff --git a/libavformat/nutenc.c b/libavformat/nutenc.c
index 9bb9a4e502..47eaa2c81c 100644
--- a/libavformat/nutenc.c
+++ b/libavformat/nutenc.c
@@ -281,7 +281,7 @@ static inline void put_s_trace(AVIOContext *bc, int64_t v, char *file, char *fun
 //FIXME remove calculate_checksum
 static void put_packet(NUTContext *nut, AVIOContext *bc, AVIOContext *dyn_bc, int calculate_checksum, uint64_t startcode){
     uint8_t *dyn_buf=NULL;
-    int dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
+    int dyn_size= avio_close_dyn_buf(dyn_bc, &dyn_buf);
     int forw_ptr= dyn_size + 4*calculate_checksum;
 
     if(forw_ptr > 4096)
@@ -436,7 +436,7 @@ static int write_globalinfo(NUTContext *nut, AVIOContext *bc){
     AVIOContext *dyn_bc;
     uint8_t *dyn_buf=NULL;
     int count=0, dyn_size;
-    int ret = url_open_dyn_buf(&dyn_bc);
+    int ret = avio_open_dyn_buf(&dyn_bc);
     if(ret < 0)
         return ret;
 
@@ -450,7 +450,7 @@ static int write_globalinfo(NUTContext *nut, AVIOContext *bc){
 
     ff_put_v(bc, count);
 
-    dyn_size= url_close_dyn_buf(dyn_bc, &dyn_buf);
+    dyn_size= avio_close_dyn_buf(dyn_bc, &dyn_buf);
     avio_write(bc, dyn_buf, dyn_size);
     av_free(dyn_buf);
     return 0;
@@ -462,7 +462,7 @@ static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id){
     AVIOContext *dyn_bc;
     uint8_t *dyn_buf=NULL;
     int count=0, dyn_size, i;
-    int ret = url_open_dyn_buf(&dyn_bc);
+    int ret = avio_open_dyn_buf(&dyn_bc);
     if(ret < 0)
         return ret;
 
@@ -470,7 +470,7 @@ static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id){
         if (st->disposition & ff_nut_dispositions[i].flag)
             count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);
     }
-    dyn_size = url_close_dyn_buf(dyn_bc, &dyn_buf);
+    dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
 
     if (count) {
         ff_put_v(bc, stream_id + 1); //stream_id_plus1
@@ -495,7 +495,7 @@ static int write_chapter(NUTContext *nut, AVIOContext *bc, int id)
     AVChapter *ch    = nut->avf->chapters[id];
     int ret, dyn_size, count = 0;
 
-    ret = url_open_dyn_buf(&dyn_bc);
+    ret = avio_open_dyn_buf(&dyn_bc);
     if (ret < 0)
         return ret;
 
@@ -509,7 +509,7 @@ static int write_chapter(NUTContext *nut, AVIOContext *bc, int id)
 
     ff_put_v(bc, count);
 
-    dyn_size = url_close_dyn_buf(dyn_bc, &dyn_buf);
+    dyn_size = avio_close_dyn_buf(dyn_bc, &dyn_buf);
     avio_write(bc, dyn_buf, dyn_size);
     av_freep(&dyn_buf);
     return 0;
@@ -522,14 +522,14 @@ static int write_headers(AVFormatContext *avctx, AVIOContext *bc){
 
     ff_metadata_conv_ctx(avctx, ff_nut_metadata_conv, NULL);
 
-    ret = url_open_dyn_buf(&dyn_bc);
+    ret = avio_open_dyn_buf(&dyn_bc);
     if(ret < 0)
         return ret;
     write_mainheader(nut, dyn_bc);
     put_packet(nut, bc, dyn_bc, 1, MAIN_STARTCODE);
 
     for (i=0; i < nut->avf->nb_streams; i++){
-        ret = url_open_dyn_buf(&dyn_bc);
+        ret = avio_open_dyn_buf(&dyn_bc);
         if(ret < 0)
             return ret;
         if ((ret = write_streamheader(avctx, dyn_bc, nut->avf->streams[i], i)) < 0)
@@ -537,14 +537,14 @@ static int write_headers(AVFormatContext *avctx, AVIOContext *bc){
         put_packet(nut, bc, dyn_bc, 1, STREAM_STARTCODE);
     }
 
-    ret = url_open_dyn_buf(&dyn_bc);
+    ret = avio_open_dyn_buf(&dyn_bc);
     if(ret < 0)
         return ret;
     write_globalinfo(nut, dyn_bc);
     put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
 
     for (i = 0; i < nut->avf->nb_streams; i++) {
-        ret = url_open_dyn_buf(&dyn_bc);
+        ret = avio_open_dyn_buf(&dyn_bc);
         if(ret < 0)
             return ret;
         ret = write_streaminfo(nut, dyn_bc, i);
@@ -554,19 +554,19 @@ static int write_headers(AVFormatContext *avctx, AVIOContext *bc){
             put_packet(nut, bc, dyn_bc, 1, INFO_STARTCODE);
         else {
             uint8_t* buf;
-            url_close_dyn_buf(dyn_bc, &buf);
+            avio_close_dyn_buf(dyn_bc, &buf);
             av_free(buf);
         }
     }
 
     for (i = 0; i < nut->avf->nb_chapters; i++) {
-        ret = url_open_dyn_buf(&dyn_bc);
+        ret = avio_open_dyn_buf(&dyn_bc);
         if (ret < 0)
             return ret;
         ret = write_chapter(nut, dyn_bc, i);
         if (ret < 0) {
             uint8_t *buf;
-            url_close_dyn_buf(dyn_bc, &buf);
+            avio_close_dyn_buf(dyn_bc, &buf);
             av_freep(&buf);
             return ret;
         }
@@ -728,7 +728,7 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt){
                          NULL);
 
         nut->last_syncpoint_pos= avio_tell(bc);
-        ret = url_open_dyn_buf(&dyn_bc);
+        ret = avio_open_dyn_buf(&dyn_bc);
         if(ret < 0)
             return ret;
         put_tt(nut, nus->time_base, dyn_bc, pkt->dts);
diff --git a/libavformat/oggdec.c b/libavformat/oggdec.c
index 379de7eac1..ddc7a1fd5c 100644
--- a/libavformat/oggdec.c
+++ b/libavformat/oggdec.c
@@ -455,7 +455,7 @@ ogg_get_length (AVFormatContext * s)
     int i;
     int64_t size, end;
 
-    if(url_is_streamed(s->pb))
+    if(!s->pb->seekable)
         return 0;
 
 // already set
diff --git a/libavformat/oggenc.c b/libavformat/oggenc.c
index a039d689e6..f0251a6455 100644
--- a/libavformat/oggenc.c
+++ b/libavformat/oggenc.c
@@ -82,7 +82,7 @@ static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
     int ret, size;
     uint8_t *buf;
 
-    ret = url_open_dyn_buf(&pb);
+    ret = avio_open_dyn_buf(&pb);
     if (ret < 0)
         return ret;
     ffio_init_checksum(pb, ff_crc04C11DB7_update, 0);
@@ -101,7 +101,7 @@ static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
     ogg_update_checksum(s, pb, crc_offset);
     avio_flush(pb);
 
-    size = url_close_dyn_buf(pb, &buf);
+    size = avio_close_dyn_buf(pb, &buf);
     if (size < 0)
         return size;
 
diff --git a/libavformat/r3d.c b/libavformat/r3d.c
index aad88ee9c7..5e027d158b 100644
--- a/libavformat/r3d.c
+++ b/libavformat/r3d.c
@@ -177,7 +177,7 @@ static int r3d_read_header(AVFormatContext *s, AVFormatParameters *ap)
 
     s->data_offset = avio_tell(s->pb);
     av_dlog(s, "data offset %#llx\n", s->data_offset);
-    if (url_is_streamed(s->pb))
+    if (!s->pb->seekable)
         return 0;
     // find REOB/REOF/REOS to load index
     avio_seek(s->pb, avio_size(s->pb)-48-8, SEEK_SET);
diff --git a/libavformat/rmdec.c b/libavformat/rmdec.c
index 1ffeae56ee..6fb362473e 100644
--- a/libavformat/rmdec.c
+++ b/libavformat/rmdec.c
@@ -481,7 +481,7 @@ static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
 
     if (!data_off)
         data_off = avio_tell(pb) - 18;
-    if (indx_off && !url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX) &&
+    if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
         avio_seek(pb, indx_off, SEEK_SET) >= 0) {
         rm_read_index(s);
         avio_seek(pb, data_off + 18, SEEK_SET);
diff --git a/libavformat/rmenc.c b/libavformat/rmenc.c
index 28ee173fb8..e08b677987 100644
--- a/libavformat/rmenc.c
+++ b/libavformat/rmenc.c
@@ -118,7 +118,7 @@ static int rv10_write_header(AVFormatContext *ctx,
     avio_wb32(s, 0);           /* data offset : will be patched after */
     avio_wb16(s, ctx->nb_streams);    /* num streams */
     flags = 1 | 2; /* save allowed & perfect play */
-    if (url_is_streamed(s))
+    if (!s->seekable)
         flags |= 4; /* live broadcast */
     avio_wb16(s, flags);
 
@@ -170,7 +170,7 @@ static int rv10_write_header(AVFormatContext *ctx,
         avio_wb32(s, 0);           /* start time */
         avio_wb32(s, BUFFER_DURATION);           /* preroll */
         /* duration */
-        if (url_is_streamed(s) || !stream->total_frames)
+        if (!s->seekable || !stream->total_frames)
             avio_wb32(s, (int)(3600 * 1000));
         else
             avio_wb32(s, (int)(stream->total_frames * 1000 / stream->frame_rate));
@@ -434,7 +434,7 @@ static int rm_write_trailer(AVFormatContext *s)
     int data_size, index_pos, i;
     AVIOContext *pb = s->pb;
 
-    if (!url_is_streamed(s->pb)) {
+    if (s->pb->seekable) {
         /* end of file: finish to write header */
         index_pos = avio_tell(pb);
         data_size = index_pos - rm->data_pos;
diff --git a/libavformat/rsoenc.c b/libavformat/rsoenc.c
index 58cfc798c9..ca9985b070 100644
--- a/libavformat/rsoenc.c
+++ b/libavformat/rsoenc.c
@@ -38,7 +38,7 @@ static int rso_write_header(AVFormatContext *s)
         return AVERROR_INVALIDDATA;
     }
 
-    if (url_is_streamed(s->pb)) {
+    if (!s->pb->seekable) {
         av_log(s, AV_LOG_ERROR, "muxer does not support non seekable output\n");
         return AVERROR_INVALIDDATA;
     }
diff --git a/libavformat/rtpdec.c b/libavformat/rtpdec.c
index 438ceda810..ec266c6668 100644
--- a/libavformat/rtpdec.c
+++ b/libavformat/rtpdec.c
@@ -41,7 +41,7 @@
          buffer to 'rtp_write_packet' contains all the packets for ONE
          frame. Each packet should have a four byte header containing
          the length in big endian format (same trick as
-         'url_open_dyn_packet_buf')
+         'ffio_open_dyn_packet_buf')
 */
 
 static RTPDynamicProtocolHandler ff_realmedia_mp3_dynamic_handler = {
@@ -264,7 +264,7 @@ int rtp_check_and_send_back_rr(RTPDemuxContext *s, int count)
         return -1;
     s->last_octet_count = s->octet_count;
 
-    if (url_open_dyn_buf(&pb) < 0)
+    if (avio_open_dyn_buf(&pb) < 0)
         return -1;
 
     // Receiver Report
@@ -321,7 +321,7 @@ int rtp_check_and_send_back_rr(RTPDemuxContext *s, int count)
     }
 
     avio_flush(pb);
-    len = url_close_dyn_buf(pb, &buf);
+    len = avio_close_dyn_buf(pb, &buf);
     if ((len > 0) && buf) {
         int result;
         av_dlog(s->ic, "sending %d bytes of RR\n", len);
@@ -339,7 +339,7 @@ void rtp_send_punch_packets(URLContext* rtp_handle)
     int len;
 
     /* Send a small RTP packet */
-    if (url_open_dyn_buf(&pb) < 0)
+    if (avio_open_dyn_buf(&pb) < 0)
         return;
 
     avio_w8(pb, (RTP_VERSION << 6));
@@ -349,13 +349,13 @@ void rtp_send_punch_packets(URLContext* rtp_handle)
     avio_wb32(pb, 0); /* SSRC */
 
     avio_flush(pb);
-    len = url_close_dyn_buf(pb, &buf);
+    len = avio_close_dyn_buf(pb, &buf);
     if ((len > 0) && buf)
         url_write(rtp_handle, buf, len);
     av_free(buf);
 
     /* Send a minimal RTCP RR */
-    if (url_open_dyn_buf(&pb) < 0)
+    if (avio_open_dyn_buf(&pb) < 0)
         return;
 
     avio_w8(pb, (RTP_VERSION << 6));
@@ -364,7 +364,7 @@ void rtp_send_punch_packets(URLContext* rtp_handle)
     avio_wb32(pb, 0); /* our own SSRC */
 
     avio_flush(pb);
-    len = url_close_dyn_buf(pb, &buf);
+    len = avio_close_dyn_buf(pb, &buf);
     if ((len > 0) && buf)
         url_write(rtp_handle, buf, len);
     av_free(buf);
diff --git a/libavformat/rtpdec_asf.c b/libavformat/rtpdec_asf.c
index 3c19ad6e5b..61bf87d37d 100644
--- a/libavformat/rtpdec_asf.c
+++ b/libavformat/rtpdec_asf.c
@@ -203,12 +203,12 @@ static int asfrtp_parse_packet(AVFormatContext *s, PayloadContext *asf,
                  */
                 if (asf->pktbuf && len_off != avio_tell(asf->pktbuf)) {
                     uint8_t *p;
-                    url_close_dyn_buf(asf->pktbuf, &p);
+                    avio_close_dyn_buf(asf->pktbuf, &p);
                     asf->pktbuf = NULL;
                     av_free(p);
                 }
                 if (!len_off && !asf->pktbuf &&
-                    (res = url_open_dyn_buf(&asf->pktbuf)) < 0)
+                    (res = avio_open_dyn_buf(&asf->pktbuf)) < 0)
                     return res;
                 if (!asf->pktbuf)
                     return AVERROR(EIO);
@@ -217,7 +217,7 @@ static int asfrtp_parse_packet(AVFormatContext *s, PayloadContext *asf,
                 avio_skip(pb, len - off);
                 if (!(flags & RTP_FLAG_MARKER))
                     return -1;
-                out_len     = url_close_dyn_buf(asf->pktbuf, &asf->buf);
+                out_len     = avio_close_dyn_buf(asf->pktbuf, &asf->buf);
                 asf->pktbuf = NULL;
             } else {
                 /**
@@ -272,7 +272,7 @@ static void asfrtp_free_context(PayloadContext *asf)
 {
     if (asf->pktbuf) {
         uint8_t *p = NULL;
-        url_close_dyn_buf(asf->pktbuf, &p);
+        avio_close_dyn_buf(asf->pktbuf, &p);
         asf->pktbuf = NULL;
         av_free(p);
     }
diff --git a/libavformat/rtpdec_latm.c b/libavformat/rtpdec_latm.c
index c6d865a650..6ff9fd9c99 100644
--- a/libavformat/rtpdec_latm.c
+++ b/libavformat/rtpdec_latm.c
@@ -43,7 +43,7 @@ static void latm_free_context(PayloadContext *data)
         return;
     if (data->dyn_buf) {
         uint8_t *p;
-        url_close_dyn_buf(data->dyn_buf, &p);
+        avio_close_dyn_buf(data->dyn_buf, &p);
         av_free(p);
     }
     av_free(data->buf);
@@ -60,12 +60,12 @@ static int latm_parse_packet(AVFormatContext *ctx, PayloadContext *data,
         if (!data->dyn_buf || data->timestamp != *timestamp) {
             av_freep(&data->buf);
             if (data->dyn_buf)
-                url_close_dyn_buf(data->dyn_buf, &data->buf);
+                avio_close_dyn_buf(data->dyn_buf, &data->buf);
             data->dyn_buf = NULL;
             av_freep(&data->buf);
 
             data->timestamp = *timestamp;
-            if ((ret = url_open_dyn_buf(&data->dyn_buf)) < 0)
+            if ((ret = avio_open_dyn_buf(&data->dyn_buf)) < 0)
                 return ret;
         }
         avio_write(data->dyn_buf, buf, len);
@@ -73,7 +73,7 @@ static int latm_parse_packet(AVFormatContext *ctx, PayloadContext *data,
         if (!(flags & RTP_FLAG_MARKER))
             return AVERROR(EAGAIN);
         av_free(data->buf);
-        data->len = url_close_dyn_buf(data->dyn_buf, &data->buf);
+        data->len = avio_close_dyn_buf(data->dyn_buf, &data->buf);
         data->dyn_buf = NULL;
         data->pos = 0;
     }
diff --git a/libavformat/rtpdec_svq3.c b/libavformat/rtpdec_svq3.c
index a4fad1cc13..b3559aeb05 100644
--- a/libavformat/rtpdec_svq3.c
+++ b/libavformat/rtpdec_svq3.c
@@ -83,10 +83,10 @@ static int svq3_parse_packet (AVFormatContext *s, PayloadContext *sv,
 
         if (sv->pktbuf) {
             uint8_t *tmp;
-            url_close_dyn_buf(sv->pktbuf, &tmp);
+            avio_close_dyn_buf(sv->pktbuf, &tmp);
             av_free(tmp);
         }
-        if ((res = url_open_dyn_buf(&sv->pktbuf)) < 0)
+        if ((res = avio_open_dyn_buf(&sv->pktbuf)) < 0)
             return res;
         sv->timestamp   = *timestamp;
     }
@@ -100,7 +100,7 @@ static int svq3_parse_packet (AVFormatContext *s, PayloadContext *sv,
         av_init_packet(pkt);
         pkt->stream_index = st->index;
         *timestamp        = sv->timestamp;
-        pkt->size         = url_close_dyn_buf(sv->pktbuf, &pkt->data);
+        pkt->size         = avio_close_dyn_buf(sv->pktbuf, &pkt->data);
         pkt->destruct     = av_destruct_packet;
         sv->pktbuf        = NULL;
         return 0;
@@ -118,7 +118,7 @@ static void svq3_extradata_free(PayloadContext *sv)
 {
     if (sv->pktbuf) {
         uint8_t *buf;
-        url_close_dyn_buf(sv->pktbuf, &buf);
+        avio_close_dyn_buf(sv->pktbuf, &buf);
         av_free(buf);
     }
     av_free(sv);
diff --git a/libavformat/rtpdec_vp8.c b/libavformat/rtpdec_vp8.c
index 3b1ee137aa..e657ca2ad5 100644
--- a/libavformat/rtpdec_vp8.c
+++ b/libavformat/rtpdec_vp8.c
@@ -41,7 +41,7 @@ static void prepare_packet(AVPacket *pkt, PayloadContext *vp8, int stream)
     av_init_packet(pkt);
     pkt->stream_index = stream;
     pkt->flags        = vp8->is_keyframe ? AV_PKT_FLAG_KEY : 0;
-    pkt->size         = url_close_dyn_buf(vp8->data, &pkt->data);
+    pkt->size         = avio_close_dyn_buf(vp8->data, &pkt->data);
     pkt->destruct     = av_destruct_packet;
     vp8->data         = NULL;
 }
@@ -85,7 +85,7 @@ static int vp8_handle_packet(AVFormatContext *ctx,
             // that for the next av_get_packet call
             ret = end_packet ? 1 : 0;
         }
-        if ((res = url_open_dyn_buf(&vp8->data)) < 0)
+        if ((res = avio_open_dyn_buf(&vp8->data)) < 0)
             return res;
         vp8->is_keyframe = *buf & 1;
         vp8->timestamp   = ts;
@@ -138,7 +138,7 @@ static void vp8_free_context(PayloadContext *vp8)
 {
     if (vp8->data) {
         uint8_t *tmp;
-        url_close_dyn_buf(vp8->data, &tmp);
+        avio_close_dyn_buf(vp8->data, &tmp);
         av_free(tmp);
     }
     av_free(vp8);
diff --git a/libavformat/rtpdec_xiph.c b/libavformat/rtpdec_xiph.c
index 37e57f504f..5a9abdb787 100644
--- a/libavformat/rtpdec_xiph.c
+++ b/libavformat/rtpdec_xiph.c
@@ -57,7 +57,7 @@ static inline void free_fragment_if_needed(PayloadContext * data)
 {
     if (data->fragment) {
         uint8_t* p;
-        url_close_dyn_buf(data->fragment, &p);
+        avio_close_dyn_buf(data->fragment, &p);
         av_free(p);
         data->fragment = NULL;
     }
@@ -176,7 +176,7 @@ static int xiph_handle_packet(AVFormatContext * ctx,
         // end packet has been lost somewhere, so drop buffered data
         free_fragment_if_needed(data);
 
-        if((res = url_open_dyn_buf(&data->fragment)) < 0)
+        if((res = avio_open_dyn_buf(&data->fragment)) < 0)
             return res;
 
         avio_write(data->fragment, buf, pkt_len);
@@ -203,7 +203,7 @@ static int xiph_handle_packet(AVFormatContext * ctx,
         if (fragmented == 3) {
             // end of xiph data packet
             av_init_packet(pkt);
-            pkt->size = url_close_dyn_buf(data->fragment, &pkt->data);
+            pkt->size = avio_close_dyn_buf(data->fragment, &pkt->data);
 
             if (pkt->size < 0) {
                 av_log(ctx, AV_LOG_ERROR,
diff --git a/libavformat/rtpenc_chain.c b/libavformat/rtpenc_chain.c
index 84611e690d..bd3d1a875d 100644
--- a/libavformat/rtpenc_chain.c
+++ b/libavformat/rtpenc_chain.c
@@ -20,7 +20,9 @@
  */
 
 #include "avformat.h"
+#include "avio_internal.h"
 #include "rtpenc_chain.h"
+#include "avio_internal.h"
 
 AVFormatContext *ff_rtp_chain_mux_open(AVFormatContext *s, AVStream *st,
                                        URLContext *handle, int packet_size)
@@ -53,9 +55,9 @@ AVFormatContext *ff_rtp_chain_mux_open(AVFormatContext *s, AVStream *st,
     avcodec_copy_context(rtpctx->streams[0]->codec, st->codec);
 
     if (handle) {
-        url_fdopen(&rtpctx->pb, handle);
+        ffio_fdopen(&rtpctx->pb, handle);
     } else
-        url_open_dyn_packet_buf(&rtpctx->pb, packet_size);
+        ffio_open_dyn_packet_buf(&rtpctx->pb, packet_size);
     ret = av_write_header(rtpctx);
 
     if (ret) {
@@ -63,7 +65,7 @@ AVFormatContext *ff_rtp_chain_mux_open(AVFormatContext *s, AVStream *st,
             avio_close(rtpctx->pb);
         } else {
             uint8_t *ptr;
-            url_close_dyn_buf(rtpctx->pb, &ptr);
+            avio_close_dyn_buf(rtpctx->pb, &ptr);
             av_free(ptr);
         }
         avformat_free_context(rtpctx);
diff --git a/libavformat/rtsp.c b/libavformat/rtsp.c
index f81a604d2c..227c4ccd96 100644
--- a/libavformat/rtsp.c
+++ b/libavformat/rtsp.c
@@ -495,7 +495,7 @@ void ff_rtsp_undo_setup(AVFormatContext *s)
                 av_write_trailer(rtpctx);
                 if (rt->lower_transport == RTSP_LOWER_TRANSPORT_TCP) {
                     uint8_t *ptr;
-                    url_close_dyn_buf(rtpctx->pb, &ptr);
+                    avio_close_dyn_buf(rtpctx->pb, &ptr);
                     av_free(ptr);
                 } else {
                     avio_close(rtpctx->pb);
diff --git a/libavformat/rtspenc.c b/libavformat/rtspenc.c
index 5d76fdf0b5..7f788f6f9a 100644
--- a/libavformat/rtspenc.c
+++ b/libavformat/rtspenc.c
@@ -29,6 +29,7 @@
 #include "os_support.h"
 #include "rtsp.h"
 #include "internal.h"
+#include "avio_internal.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/avstring.h"
 
@@ -135,14 +136,14 @@ static int tcp_write_packet(AVFormatContext *s, RTSPStream *rtsp_st)
     int size;
     uint8_t *interleave_header, *interleaved_packet;
 
-    size = url_close_dyn_buf(rtpctx->pb, &buf);
+    size = avio_close_dyn_buf(rtpctx->pb, &buf);
     ptr = buf;
     while (size > 4) {
         uint32_t packet_len = AV_RB32(ptr);
         int id;
         /* The interleaving header is exactly 4 bytes, which happens to be
          * the same size as the packet length header from
-         * url_open_dyn_packet_buf. So by writing the interleaving header
+         * ffio_open_dyn_packet_buf. So by writing the interleaving header
          * over these bytes, we get a consecutive interleaved packet
          * that can be written in one call. */
         interleaved_packet = interleave_header = ptr;
@@ -162,7 +163,7 @@ static int tcp_write_packet(AVFormatContext *s, RTSPStream *rtsp_st)
         size -= packet_len;
     }
     av_free(buf);
-    url_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);
+    ffio_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);
     return 0;
 }
 
diff --git a/libavformat/soxenc.c b/libavformat/soxenc.c
index 214acdd59b..c93869c691 100644
--- a/libavformat/soxenc.c
+++ b/libavformat/soxenc.c
@@ -96,7 +96,7 @@ static int sox_write_trailer(AVFormatContext *s)
     AVIOContext *pb = s->pb;
     AVCodecContext *enc = s->streams[0]->codec;
 
-    if (!url_is_streamed(s->pb)) {
+    if (s->pb->seekable) {
         /* update number of samples */
         int64_t file_size = avio_tell(pb);
         int64_t num_samples = (file_size - sox->header_size - 4LL) >> 2LL;
diff --git a/libavformat/swfenc.c b/libavformat/swfenc.c
index 052d7205e8..f5328d0d9d 100644
--- a/libavformat/swfenc.c
+++ b/libavformat/swfenc.c
@@ -492,7 +492,7 @@ static int swf_write_trailer(AVFormatContext *s)
     avio_flush(s->pb);
 
     /* patch file size and number of frames if not streamed */
-    if (!url_is_streamed(s->pb) && video_enc) {
+    if (s->pb->seekable && video_enc) {
         file_size = avio_tell(pb);
         avio_seek(pb, 4, SEEK_SET);
         avio_wl32(pb, file_size);
diff --git a/libavformat/tty.c b/libavformat/tty.c
index 71c00e7e0a..b288d15393 100644
--- a/libavformat/tty.c
+++ b/libavformat/tty.c
@@ -88,7 +88,7 @@ static int read_header(AVFormatContext *avctx,
     /* simulate tty display speed */
     s->chars_per_frame = FFMAX(av_q2d(st->time_base) * (ap->sample_rate ? ap->sample_rate : LINE_RATE), 1);
 
-    if (!url_is_streamed(avctx->pb)) {
+    if (avctx->pb->seekable) {
         s->fsize = avio_size(avctx->pb);
         st->duration = (s->fsize + s->chars_per_frame - 1) / s->chars_per_frame;
 
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 87a1bdc89c..6e7fedc049 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -2037,7 +2037,7 @@ static void av_estimate_timings(AVFormatContext *ic, int64_t old_offset)
 
     if ((!strcmp(ic->iformat->name, "mpeg") ||
          !strcmp(ic->iformat->name, "mpegts")) &&
-        file_size && !url_is_streamed(ic->pb)) {
+        file_size && ic->pb->seekable) {
         /* get accurate estimate from the PTSes */
         av_estimate_timings_from_pts(ic, old_offset);
     } else if (av_has_duration(ic)) {
diff --git a/libavformat/vc1testenc.c b/libavformat/vc1testenc.c
index 89ee9ef78c..9a77e924a1 100644
--- a/libavformat/vc1testenc.c
+++ b/libavformat/vc1testenc.c
@@ -73,7 +73,7 @@ static int vc1test_write_trailer(AVFormatContext *s)
     RCVContext *ctx = s->priv_data;
     AVIOContext *pb = s->pb;
 
-    if (!url_is_streamed(s->pb)) {
+    if (s->pb->seekable) {
         avio_seek(pb, 0, SEEK_SET);
         avio_wl24(pb, ctx->frames);
         avio_flush(pb);
diff --git a/libavformat/vocdec.c b/libavformat/vocdec.c
index d11e68c49f..b0195e90c3 100644
--- a/libavformat/vocdec.c
+++ b/libavformat/vocdec.c
@@ -78,7 +78,7 @@ voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
             return AVERROR(EIO);
         voc->remaining_size = avio_rl24(pb);
         if (!voc->remaining_size) {
-            if (url_is_streamed(s->pb))
+            if (!s->pb->seekable)
                 return AVERROR(EIO);
             voc->remaining_size = avio_size(pb) - avio_tell(pb);
         }
diff --git a/libavformat/wav.c b/libavformat/wav.c
index afe0d0e98e..afdd70114e 100644
--- a/libavformat/wav.c
+++ b/libavformat/wav.c
@@ -57,7 +57,7 @@ static int wav_write_header(AVFormatContext *s)
     ff_end_tag(pb, fmt);
 
     if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */
-        && !url_is_streamed(s->pb)) {
+        && s->pb->seekable) {
         fact = ff_start_tag(pb, "fact");
         avio_wl32(pb, 0);
         ff_end_tag(pb, fact);
@@ -97,7 +97,7 @@ static int wav_write_trailer(AVFormatContext *s)
 
     avio_flush(pb);
 
-    if (!url_is_streamed(s->pb)) {
+    if (s->pb->seekable) {
         ff_end_tag(pb, wav->data);
 
         /* update file size */
diff --git a/libavformat/wv.c b/libavformat/wv.c
index 600de9317b..52ec9264a0 100644
--- a/libavformat/wv.c
+++ b/libavformat/wv.c
@@ -121,7 +121,7 @@ static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb, int appen
     }
     if((rate == -1 || !chan) && !wc->block_parsed){
         int64_t block_end = avio_tell(pb) + wc->blksize - 24;
-        if(url_is_streamed(pb)){
+        if(!pb->seekable){
             av_log(ctx, AV_LOG_ERROR, "Cannot determine additional parameters\n");
             return -1;
         }
@@ -223,7 +223,7 @@ static int wv_read_header(AVFormatContext *s,
     st->start_time = 0;
     st->duration = wc->samples;
 
-    if(!url_is_streamed(s->pb)) {
+    if(s->pb->seekable) {
         int64_t cur = avio_tell(s->pb);
         ff_ape_parse_tag(s);
         if(!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))