X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Faviobuf.c;h=0c733a704bcd4ff344c3331a4b2191482b10399a;hb=813cc7abafad646522fbcf24c5ecd00412236381;hp=b1e1b49a7e17d6bb44bd1c92e9890ca34dd48ba6;hpb=0e7ceb2442f07edefc2357e3ed14d208652a99f3;p=ffmpeg

diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index b1e1b49a7e1..0c733a704bc 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -23,13 +23,25 @@
 #include "libavutil/intreadwrite.h"
 #include "avformat.h"
 #include "avio.h"
+#include "avio_internal.h"
+#include "internal.h"
 #include <stdarg.h>
 
 #define IO_BUFFER_SIZE 32768
 
-static void fill_buffer(ByteIOContext *s);
+/**
+ * Do seeks within this distance ahead of the current buffer by skipping
+ * data instead of calling the protocol seek function, for seekable
+ * protocols.
+ */
+#define SHORT_SEEK_THRESHOLD 4096
+
+static void fill_buffer(AVIOContext *s);
+#if !FF_API_URL_RESETBUF
+static int url_resetbuf(AVIOContext *s, int flags);
+#endif
 
-int init_put_byte(ByteIOContext *s,
+int ffio_init_context(AVIOContext *s,
                   unsigned char *buffer,
                   int buffer_size,
                   int write_flag,
@@ -62,7 +74,34 @@ int init_put_byte(ByteIOContext *s,
     return 0;
 }
 
-ByteIOContext *av_alloc_put_byte(
+#if FF_API_OLD_AVIO
+int init_put_byte(AVIOContext *s,
+                  unsigned char *buffer,
+                  int buffer_size,
+                  int write_flag,
+                  void *opaque,
+                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
+                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
+                  int64_t (*seek)(void *opaque, int64_t offset, int whence))
+{
+    return ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
+                                read_packet, write_packet, seek);
+}
+AVIOContext *av_alloc_put_byte(
+                  unsigned char *buffer,
+                  int buffer_size,
+                  int write_flag,
+                  void *opaque,
+                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
+                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
+                  int64_t (*seek)(void *opaque, int64_t offset, int whence))
+{
+    return avio_alloc_context(buffer, buffer_size, write_flag, opaque,
+                              read_packet, write_packet, seek);
+}
+#endif
+
+AVIOContext *avio_alloc_context(
                   unsigned char *buffer,
                   int buffer_size,
                   int write_flag,
@@ -71,13 +110,13 @@ ByteIOContext *av_alloc_put_byte(
                   int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
                   int64_t (*seek)(void *opaque, int64_t offset, int whence))
 {
-    ByteIOContext *s = av_mallocz(sizeof(ByteIOContext));
-    init_put_byte(s, buffer, buffer_size, write_flag, opaque,
+    AVIOContext *s = av_mallocz(sizeof(AVIOContext));
+    ffio_init_context(s, buffer, buffer_size, write_flag, opaque,
                   read_packet, write_packet, seek);
     return s;
 }
 
-static void flush_buffer(ByteIOContext *s)
+static void flush_buffer(AVIOContext *s)
 {
     if (s->buf_ptr > s->buffer) {
         if (s->write_packet && !s->error){
@@ -95,21 +134,31 @@ static void flush_buffer(ByteIOContext *s)
     s->buf_ptr = s->buffer;
 }
 
-void put_byte(ByteIOContext *s, int b)
+void avio_w8(AVIOContext *s, int b)
 {
     *(s->buf_ptr)++ = b;
     if (s->buf_ptr >= s->buf_end)
         flush_buffer(s);
 }
 
-void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
+void ffio_fill(AVIOContext *s, int b, int count)
 {
-    int len;
+    while (count > 0) {
+        int len = FFMIN(s->buf_end - s->buf_ptr, count);
+        memset(s->buf_ptr, b, len);
+        s->buf_ptr += len;
+
+        if (s->buf_ptr >= s->buf_end)
+            flush_buffer(s);
 
+        count -= len;
+    }
+}
+
+void avio_write(AVIOContext *s, const unsigned char *buf, int size)
+{
     while (size > 0) {
-        len = (s->buf_end - s->buf_ptr);
-        if (len > size)
-            len = size;
+        int len = FFMIN(s->buf_end - s->buf_ptr, size);
         memcpy(s->buf_ptr, buf, len);
         s->buf_ptr += len;
 
@@ -121,16 +170,18 @@ void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
     }
 }
 
-void put_flush_packet(ByteIOContext *s)
+void put_flush_packet(AVIOContext *s)
 {
     flush_buffer(s);
     s->must_flush = 0;
 }
 
-int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence)
+int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
 {
     int64_t offset1;
     int64_t pos;
+    int force = whence & AVSEEK_FORCE;
+    whence &= ~AVSEEK_FORCE;
 
     if(!s)
         return AVERROR(EINVAL);
@@ -148,18 +199,20 @@ int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence)
     }
     offset1 = offset - pos;
     if (!s->must_flush &&
-        offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
+        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 && !s->write_flag &&
-              offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
+    } else if ((s->is_streamed ||
+               offset1 <= s->buf_end + SHORT_SEEK_THRESHOLD - s->buffer) &&
+               !s->write_flag && offset1 >= 0 &&
+              (whence != SEEK_END || force)) {
         while(s->pos < offset && !s->eof_reached)
             fill_buffer(s);
         if (s->eof_reached)
-            return AVERROR(EPIPE);
+            return AVERROR_EOF;
         s->buf_ptr = s->buf_end + offset - s->pos;
     } else {
-        int64_t res = AVERROR(EPIPE);
+        int64_t res;
 
 #if CONFIG_MUXERS || CONFIG_NETWORK
         if (s->write_flag) {
@@ -167,7 +220,9 @@ int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence)
             s->must_flush = 1;
         }
 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */
-        if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
+        if (!s->seek)
+            return AVERROR(EPIPE);
+        if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
             return res;
         if (!s->write_flag)
             s->buf_end = s->buffer;
@@ -178,17 +233,20 @@ int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence)
     return offset;
 }
 
-void url_fskip(ByteIOContext *s, int64_t offset)
+#if FF_API_OLD_AVIO
+int url_fskip(AVIOContext *s, int64_t offset)
 {
-    url_fseek(s, offset, SEEK_CUR);
+    int64_t ret = avio_seek(s, offset, SEEK_CUR);
+    return ret < 0 ? ret : 0;
 }
+#endif
 
-int64_t url_ftell(ByteIOContext *s)
+int64_t url_ftell(AVIOContext *s)
 {
-    return url_fseek(s, 0, SEEK_CUR);
+    return avio_seek(s, 0, SEEK_CUR);
 }
 
-int64_t url_fsize(ByteIOContext *s)
+int64_t url_fsize(AVIOContext *s)
 {
     int64_t size;
 
@@ -196,7 +254,7 @@ int64_t url_fsize(ByteIOContext *s)
         return AVERROR(EINVAL);
 
     if (!s->seek)
-        return AVERROR(EPIPE);
+        return AVERROR(ENOSYS);
     size = s->seek(s->opaque, 0, AVSEEK_SIZE);
     if(size<0){
         if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
@@ -207,95 +265,212 @@ int64_t url_fsize(ByteIOContext *s)
     return size;
 }
 
-int url_feof(ByteIOContext *s)
+int url_feof(AVIOContext *s)
 {
     if(!s)
         return 0;
     return s->eof_reached;
 }
 
-int url_ferror(ByteIOContext *s)
+int url_ferror(AVIOContext *s)
 {
     if(!s)
         return 0;
     return s->error;
 }
 
-void put_le32(ByteIOContext *s, unsigned int val)
+void avio_wl32(AVIOContext *s, unsigned int val)
 {
-    put_byte(s, val);
-    put_byte(s, val >> 8);
-    put_byte(s, val >> 16);
-    put_byte(s, val >> 24);
+    avio_w8(s, val);
+    avio_w8(s, val >> 8);
+    avio_w8(s, val >> 16);
+    avio_w8(s, val >> 24);
 }
 
-void put_be32(ByteIOContext *s, unsigned int val)
+void avio_wb32(AVIOContext *s, unsigned int val)
 {
-    put_byte(s, val >> 24);
-    put_byte(s, val >> 16);
-    put_byte(s, val >> 8);
-    put_byte(s, val);
+    avio_w8(s, val >> 24);
+    avio_w8(s, val >> 16);
+    avio_w8(s, val >> 8);
+    avio_w8(s, val);
 }
 
-void put_strz(ByteIOContext *s, const char *str)
+#if FF_API_OLD_AVIO
+void put_strz(AVIOContext *s, const char *str)
 {
-    if (str)
-        put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
-    else
-        put_byte(s, 0);
+    avio_put_str(s, str);
 }
 
-void put_le64(ByteIOContext *s, uint64_t val)
+#define GET(name, type) \
+    type get_be ##name(AVIOContext *s) \
+{\
+    return avio_rb ##name(s);\
+}\
+    type get_le ##name(AVIOContext *s) \
+{\
+    return avio_rl ##name(s);\
+}
+
+GET(16, unsigned int)
+GET(24, unsigned int)
+GET(32, unsigned int)
+GET(64, uint64_t)
+
+#undef GET
+
+#define PUT(name, type ) \
+    void put_le ##name(AVIOContext *s, type val)\
+{\
+        avio_wl ##name(s, val);\
+}\
+    void put_be ##name(AVIOContext *s, type val)\
+{\
+        avio_wb ##name(s, val);\
+}
+
+PUT(16, unsigned int)
+PUT(24, unsigned int)
+PUT(32, unsigned int)
+PUT(64, uint64_t)
+#undef PUT
+
+int get_byte(AVIOContext *s)
+{
+   return avio_r8(s);
+}
+int get_buffer(AVIOContext *s, unsigned char *buf, int size)
+{
+    return avio_read(s, buf, size);
+}
+int get_partial_buffer(AVIOContext *s, unsigned char *buf, int size)
+{
+    return ffio_read_partial(s, buf, size);
+}
+void put_byte(AVIOContext *s, int val)
+{
+    avio_w8(s, val);
+}
+void put_buffer(AVIOContext *s, const unsigned char *buf, int size)
+{
+    avio_write(s, buf, size);
+}
+void put_nbyte(AVIOContext *s, int b, int count)
 {
-    put_le32(s, (uint32_t)(val & 0xffffffff));
-    put_le32(s, (uint32_t)(val >> 32));
+    ffio_fill(s, b, count);
 }
 
-void put_be64(ByteIOContext *s, uint64_t val)
+int url_fopen(AVIOContext **s, const char *filename, int flags)
 {
-    put_be32(s, (uint32_t)(val >> 32));
-    put_be32(s, (uint32_t)(val & 0xffffffff));
+    return avio_open(s, filename, flags);
 }
+int url_fclose(AVIOContext *s)
+{
+    return avio_close(s);
+}
+int64_t url_fseek(AVIOContext *s, int64_t offset, int whence)
+{
+    return avio_seek(s, offset, whence);
+}
+#endif
 
-void put_le16(ByteIOContext *s, unsigned int val)
+int avio_put_str(AVIOContext *s, const char *str)
 {
-    put_byte(s, val);
-    put_byte(s, val >> 8);
+    int len = 1;
+    if (str) {
+        len += strlen(str);
+        avio_write(s, (const unsigned char *) str, len);
+    } else
+        avio_w8(s, 0);
+    return len;
 }
 
-void put_be16(ByteIOContext *s, unsigned int val)
+int avio_put_str16le(AVIOContext *s, const char *str)
 {
-    put_byte(s, val >> 8);
-    put_byte(s, val);
+    const uint8_t *q = str;
+    int ret = 0;
+
+    while (*q) {
+        uint32_t ch;
+        uint16_t tmp;
+
+        GET_UTF8(ch, *q++, break;)
+        PUT_UTF16(ch, tmp, avio_wl16(s, tmp);ret += 2;)
+    }
+    avio_wl16(s, 0);
+    ret += 2;
+    return ret;
+}
+
+int ff_get_v_length(uint64_t val){
+    int i=1;
+
+    while(val>>=7)
+        i++;
+
+    return i;
 }
 
-void put_le24(ByteIOContext *s, unsigned int val)
+void ff_put_v(AVIOContext *bc, uint64_t val){
+    int i= ff_get_v_length(val);
+
+    while(--i>0)
+        avio_w8(bc, 128 | (val>>(7*i)));
+
+    avio_w8(bc, val&127);
+}
+
+void avio_wl64(AVIOContext *s, uint64_t val)
 {
-    put_le16(s, val & 0xffff);
-    put_byte(s, val >> 16);
+    avio_wl32(s, (uint32_t)(val & 0xffffffff));
+    avio_wl32(s, (uint32_t)(val >> 32));
 }
 
-void put_be24(ByteIOContext *s, unsigned int val)
+void avio_wb64(AVIOContext *s, uint64_t val)
 {
-    put_be16(s, val >> 8);
-    put_byte(s, val);
+    avio_wb32(s, (uint32_t)(val >> 32));
+    avio_wb32(s, (uint32_t)(val & 0xffffffff));
 }
 
-void put_tag(ByteIOContext *s, const char *tag)
+void avio_wl16(AVIOContext *s, unsigned int val)
+{
+    avio_w8(s, val);
+    avio_w8(s, val >> 8);
+}
+
+void avio_wb16(AVIOContext *s, unsigned int val)
+{
+    avio_w8(s, val >> 8);
+    avio_w8(s, val);
+}
+
+void avio_wl24(AVIOContext *s, unsigned int val)
+{
+    avio_wl16(s, val & 0xffff);
+    avio_w8(s, val >> 16);
+}
+
+void avio_wb24(AVIOContext *s, unsigned int val)
+{
+    avio_wb16(s, val >> 8);
+    avio_w8(s, val);
+}
+
+#if FF_API_OLD_AVIO
+void put_tag(AVIOContext *s, const char *tag)
 {
     while (*tag) {
-        put_byte(s, *tag++);
+        avio_w8(s, *tag++);
     }
 }
+#endif
 
 /* Input stream */
 
-static void fill_buffer(ByteIOContext *s)
+static void fill_buffer(AVIOContext *s)
 {
     uint8_t *dst= !s->max_packet_size && s->buf_end - s->buffer < s->buffer_size ? s->buf_ptr : s->buffer;
     int len= s->buffer_size - (dst - s->buffer);
-
-    assert(s->buf_ptr == s->buf_end);
+    int max_buffer_size = s->max_packet_size ? s->max_packet_size : IO_BUFFER_SIZE;
 
     /* no need to do anything if EOF already reached */
     if (s->eof_reached)
@@ -307,6 +482,14 @@ static void fill_buffer(ByteIOContext *s)
         s->checksum_ptr= s->buffer;
     }
 
+    /* make buffer smaller in case it ended up large after probing */
+    if (s->buffer_size > max_buffer_size) {
+        url_setbufsize(s, max_buffer_size);
+
+        s->checksum_ptr = dst = s->buffer;
+        len = s->buffer_size;
+    }
+
     if(s->read_packet)
         len = s->read_packet(s->opaque, dst, len);
     else
@@ -330,14 +513,14 @@ unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
     return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
 }
 
-unsigned long get_checksum(ByteIOContext *s)
+unsigned long get_checksum(AVIOContext *s)
 {
     s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
     s->update_checksum= NULL;
     return s->checksum;
 }
 
-void init_checksum(ByteIOContext *s,
+void init_checksum(AVIOContext *s,
                    unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
                    unsigned long checksum)
 {
@@ -349,33 +532,25 @@ void init_checksum(ByteIOContext *s,
 }
 
 /* XXX: put an inline version */
-int get_byte(ByteIOContext *s)
+int avio_r8(AVIOContext *s)
 {
-    if (s->buf_ptr < s->buf_end) {
-        return *s->buf_ptr++;
-    } else {
+    if (s->buf_ptr >= s->buf_end)
         fill_buffer(s);
-        if (s->buf_ptr < s->buf_end)
-            return *s->buf_ptr++;
-        else
-            return 0;
-    }
+    if (s->buf_ptr < s->buf_end)
+        return *s->buf_ptr++;
+    return 0;
 }
 
-int url_fgetc(ByteIOContext *s)
+int url_fgetc(AVIOContext *s)
 {
-    if (s->buf_ptr < s->buf_end) {
-        return *s->buf_ptr++;
-    } else {
+    if (s->buf_ptr >= s->buf_end)
         fill_buffer(s);
-        if (s->buf_ptr < s->buf_end)
-            return *s->buf_ptr++;
-        else
-            return URL_EOF;
-    }
+    if (s->buf_ptr < s->buf_end)
+        return *s->buf_ptr++;
+    return URL_EOF;
 }
 
-int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
+int avio_read(AVIOContext *s, unsigned char *buf, int size)
 {
     int len, size1;
 
@@ -415,10 +590,14 @@ int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
             size -= len;
         }
     }
+    if (size1 == size) {
+        if (url_ferror(s)) return url_ferror(s);
+        if (url_feof(s))   return AVERROR_EOF;
+    }
     return size1 - size;
 }
 
-int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
+int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size)
 {
     int len;
 
@@ -434,70 +613,74 @@ int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
         len = size;
     memcpy(buf, s->buf_ptr, len);
     s->buf_ptr += len;
+    if (!len) {
+        if (url_ferror(s)) return url_ferror(s);
+        if (url_feof(s))   return AVERROR_EOF;
+    }
     return len;
 }
 
-unsigned int get_le16(ByteIOContext *s)
+unsigned int avio_rl16(AVIOContext *s)
 {
     unsigned int val;
-    val = get_byte(s);
-    val |= get_byte(s) << 8;
+    val = avio_r8(s);
+    val |= avio_r8(s) << 8;
     return val;
 }
 
-unsigned int get_le24(ByteIOContext *s)
+unsigned int avio_rl24(AVIOContext *s)
 {
     unsigned int val;
-    val = get_le16(s);
-    val |= get_byte(s) << 16;
+    val = avio_rl16(s);
+    val |= avio_r8(s) << 16;
     return val;
 }
 
-unsigned int get_le32(ByteIOContext *s)
+unsigned int avio_rl32(AVIOContext *s)
 {
     unsigned int val;
-    val = get_le16(s);
-    val |= get_le16(s) << 16;
+    val = avio_rl16(s);
+    val |= avio_rl16(s) << 16;
     return val;
 }
 
-uint64_t get_le64(ByteIOContext *s)
+uint64_t avio_rl64(AVIOContext *s)
 {
     uint64_t val;
-    val = (uint64_t)get_le32(s);
-    val |= (uint64_t)get_le32(s) << 32;
+    val = (uint64_t)avio_rl32(s);
+    val |= (uint64_t)avio_rl32(s) << 32;
     return val;
 }
 
-unsigned int get_be16(ByteIOContext *s)
+unsigned int avio_rb16(AVIOContext *s)
 {
     unsigned int val;
-    val = get_byte(s) << 8;
-    val |= get_byte(s);
+    val = avio_r8(s) << 8;
+    val |= avio_r8(s);
     return val;
 }
 
-unsigned int get_be24(ByteIOContext *s)
+unsigned int avio_rb24(AVIOContext *s)
 {
     unsigned int val;
-    val = get_be16(s) << 8;
-    val |= get_byte(s);
+    val = avio_rb16(s) << 8;
+    val |= avio_r8(s);
     return val;
 }
-unsigned int get_be32(ByteIOContext *s)
+unsigned int avio_rb32(AVIOContext *s)
 {
     unsigned int val;
-    val = get_be16(s) << 16;
-    val |= get_be16(s);
+    val = avio_rb16(s) << 16;
+    val |= avio_rb16(s);
     return val;
 }
 
-char *get_strz(ByteIOContext *s, char *buf, int maxlen)
+char *get_strz(AVIOContext *s, char *buf, int maxlen)
 {
     int i = 0;
     char c;
 
-    while ((c = get_byte(s))) {
+    while ((c = avio_r8(s))) {
         if (i < maxlen-1)
             buf[i++] = c;
     }
@@ -507,31 +690,67 @@ char *get_strz(ByteIOContext *s, char *buf, int maxlen)
     return buf;
 }
 
-uint64_t get_be64(ByteIOContext *s)
+int ff_get_line(AVIOContext *s, char *buf, int maxlen)
+{
+    int i = 0;
+    char c;
+
+    do {
+        c = avio_r8(s);
+        if (c && i < maxlen-1)
+            buf[i++] = c;
+    } while (c != '\n' && c);
+
+    buf[i] = 0;
+    return i;
+}
+
+#define GET_STR16(type, read) \
+    int avio_get_str16 ##type(AVIOContext *pb, int maxlen, char *buf, int buflen)\
+{\
+    char* q = buf;\
+    int ret = 0;\
+    while (ret + 1 < maxlen) {\
+        uint8_t tmp;\
+        uint32_t ch;\
+        GET_UTF16(ch, (ret += 2) <= maxlen ? read(pb) : 0, break;)\
+        if (!ch)\
+            break;\
+        PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)\
+    }\
+    *q = 0;\
+    return ret;\
+}\
+
+GET_STR16(le, avio_rl16)
+GET_STR16(be, avio_rb16)
+
+#undef GET_STR16
+
+uint64_t avio_rb64(AVIOContext *s)
 {
     uint64_t val;
-    val = (uint64_t)get_be32(s) << 32;
-    val |= (uint64_t)get_be32(s);
+    val = (uint64_t)avio_rb32(s) << 32;
+    val |= (uint64_t)avio_rb32(s);
     return val;
 }
 
-uint64_t ff_get_v(ByteIOContext *bc){
+uint64_t ff_get_v(AVIOContext *bc){
     uint64_t val = 0;
     int tmp;
 
     do{
-        tmp = get_byte(bc);
+        tmp = avio_r8(bc);
         val= (val<<7) + (tmp&127);
     }while(tmp&128);
     return val;
 }
 
-int url_fdopen(ByteIOContext **s, URLContext *h)
+int url_fdopen(AVIOContext **s, URLContext *h)
 {
     uint8_t *buffer;
     int buffer_size, max_packet_size;
 
-
     max_packet_size = url_get_max_packet_size(h);
     if (max_packet_size) {
         buffer_size = max_packet_size; /* no need to bufferize more than one packet */
@@ -542,13 +761,13 @@ int url_fdopen(ByteIOContext **s, URLContext *h)
     if (!buffer)
         return AVERROR(ENOMEM);
 
-    *s = av_mallocz(sizeof(ByteIOContext));
+    *s = av_mallocz(sizeof(AVIOContext));
     if(!*s) {
         av_free(buffer);
         return AVERROR(ENOMEM);
     }
 
-    if (init_put_byte(*s, buffer, buffer_size,
+    if (ffio_init_context(*s, buffer, buffer_size,
                       (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
                       url_read, url_write, url_seek) < 0) {
         av_free(buffer);
@@ -564,7 +783,7 @@ int url_fdopen(ByteIOContext **s, URLContext *h)
     return 0;
 }
 
-int url_setbufsize(ByteIOContext *s, int buf_size)
+int url_setbufsize(AVIOContext *s, int buf_size)
 {
     uint8_t *buffer;
     buffer = av_malloc(buf_size);
@@ -579,11 +798,18 @@ int url_setbufsize(ByteIOContext *s, int buf_size)
     return 0;
 }
 
-int url_resetbuf(ByteIOContext *s, int flags)
+#if FF_API_URL_RESETBUF
+int url_resetbuf(AVIOContext *s, int flags)
+#else
+static int url_resetbuf(AVIOContext *s, int flags)
+#endif
 {
-    URLContext *h = s->opaque;
-    if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
+#if FF_API_URL_RESETBUF
+    if (flags & URL_RDWR)
         return AVERROR(EINVAL);
+#else
+    assert(flags == URL_WRONLY || flags == URL_RDONLY);
+#endif
 
     if (flags & URL_WRONLY) {
         s->buf_end = s->buffer + s->buffer_size;
@@ -595,7 +821,46 @@ int url_resetbuf(ByteIOContext *s, int flags)
     return 0;
 }
 
-int url_fopen(ByteIOContext **s, const char *filename, int flags)
+int ff_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size)
+{
+    int64_t buffer_start;
+    int buffer_size;
+    int overlap, new_size, alloc_size;
+
+    if (s->write_flag)
+        return AVERROR(EINVAL);
+
+    buffer_size = s->buf_end - s->buffer;
+
+    /* the buffers must touch or overlap */
+    if ((buffer_start = s->pos - buffer_size) > buf_size)
+        return AVERROR(EINVAL);
+
+    overlap = buf_size - buffer_start;
+    new_size = buf_size + buffer_size - overlap;
+
+    alloc_size = FFMAX(s->buffer_size, new_size);
+    if (alloc_size > buf_size)
+        if (!(buf = av_realloc(buf, alloc_size)))
+            return AVERROR(ENOMEM);
+
+    if (new_size > buf_size) {
+        memcpy(buf + buf_size, s->buffer + overlap, buffer_size - overlap);
+        buf_size = new_size;
+    }
+
+    av_free(s->buffer);
+    s->buf_ptr = s->buffer = buf;
+    s->buffer_size = alloc_size;
+    s->pos = buf_size;
+    s->buf_end = s->buf_ptr + buf_size;
+    s->eof_reached = 0;
+    s->must_flush = 0;
+
+    return 0;
+}
+
+int avio_open(AVIOContext **s, const char *filename, int flags)
 {
     URLContext *h;
     int err;
@@ -611,7 +876,7 @@ int url_fopen(ByteIOContext **s, const char *filename, int flags)
     return 0;
 }
 
-int url_fclose(ByteIOContext *s)
+int avio_close(AVIOContext *s)
 {
     URLContext *h = s->opaque;
 
@@ -620,13 +885,13 @@ int url_fclose(ByteIOContext *s)
     return url_close(h);
 }
 
-URLContext *url_fileno(ByteIOContext *s)
+URLContext *url_fileno(AVIOContext *s)
 {
     return s->opaque;
 }
 
 #if CONFIG_MUXERS
-int url_fprintf(ByteIOContext *s, const char *fmt, ...)
+int url_fprintf(AVIOContext *s, const char *fmt, ...)
 {
     va_list ap;
     char buf[4096];
@@ -635,12 +900,12 @@ int url_fprintf(ByteIOContext *s, const char *fmt, ...)
     va_start(ap, fmt);
     ret = vsnprintf(buf, sizeof(buf), fmt, ap);
     va_end(ap);
-    put_buffer(s, buf, strlen(buf));
+    avio_write(s, buf, strlen(buf));
     return ret;
 }
 #endif //CONFIG_MUXERS
 
-char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
+char *url_fgets(AVIOContext *s, char *buf, int buf_size)
 {
     int c;
     char *q;
@@ -661,19 +926,19 @@ char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
     return buf;
 }
 
-int url_fget_max_packet_size(ByteIOContext *s)
+int url_fget_max_packet_size(AVIOContext *s)
 {
     return s->max_packet_size;
 }
 
-int av_url_read_fpause(ByteIOContext *s, int pause)
+int av_url_read_fpause(AVIOContext *s, int pause)
 {
     if (!s->read_pause)
         return AVERROR(ENOSYS);
     return s->read_pause(s->opaque, pause);
 }
 
-int64_t av_url_read_fseek(ByteIOContext *s, int stream_index,
+int64_t av_url_read_fseek(AVIOContext *s, int stream_index,
                           int64_t timestamp, int flags)
 {
     URLContext *h = s->opaque;
@@ -682,8 +947,13 @@ int64_t av_url_read_fseek(ByteIOContext *s, int stream_index,
         return AVERROR(ENOSYS);
     ret = s->read_seek(h, stream_index, timestamp, flags);
     if(ret >= 0) {
+        int64_t pos;
         s->buf_ptr = s->buf_end; // Flush buffer
-        s->pos = s->seek(h, 0, SEEK_CUR);
+        pos = s->seek(h, 0, SEEK_CUR);
+        if (pos >= 0)
+            s->pos = pos;
+        else if (pos != AVERROR(ENOSYS))
+            ret = pos;
     }
     return ret;
 }
@@ -692,13 +962,13 @@ int64_t av_url_read_fseek(ByteIOContext *s, int stream_index,
  * back to the server even if CONFIG_MUXERS is false. */
 #if CONFIG_MUXERS || CONFIG_NETWORK
 /* buffer handling */
-int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
+int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags)
 {
     int ret;
-    *s = av_mallocz(sizeof(ByteIOContext));
+    *s = av_mallocz(sizeof(AVIOContext));
     if(!*s)
         return AVERROR(ENOMEM);
-    ret = init_put_byte(*s, buf, buf_size,
+    ret = ffio_init_context(*s, buf, buf_size,
                         (flags & URL_WRONLY || flags & URL_RDWR),
                         NULL, NULL, NULL, NULL);
     if(ret != 0)
@@ -706,7 +976,7 @@ int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
     return ret;
 }
 
-int url_close_buf(ByteIOContext *s)
+int url_close_buf(AVIOContext *s)
 {
     put_flush_packet(s);
     return s->buf_ptr - s->buffer;
@@ -780,28 +1050,24 @@ static int64_t dyn_buf_seek(void *opaque, int64_t offset, int whence)
     return 0;
 }
 
-static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size)
+static int url_open_dyn_buf_internal(AVIOContext **s, int max_packet_size)
 {
     DynBuffer *d;
-    int io_buffer_size, ret;
-
-    if (max_packet_size)
-        io_buffer_size = max_packet_size;
-    else
-        io_buffer_size = 1024;
+    int ret;
+    unsigned io_buffer_size = max_packet_size ? max_packet_size : 1024;
 
     if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
         return -1;
     d = av_mallocz(sizeof(DynBuffer) + io_buffer_size);
     if (!d)
         return AVERROR(ENOMEM);
-    *s = av_mallocz(sizeof(ByteIOContext));
+    *s = av_mallocz(sizeof(AVIOContext));
     if(!*s) {
         av_free(d);
         return AVERROR(ENOMEM);
     }
     d->io_buffer_size = io_buffer_size;
-    ret = init_put_byte(*s, d->io_buffer, 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);
@@ -814,22 +1080,30 @@ static int url_open_dyn_buf_internal(ByteIOContext **s, int max_packet_size)
     return ret;
 }
 
-int url_open_dyn_buf(ByteIOContext **s)
+int url_open_dyn_buf(AVIOContext **s)
 {
     return url_open_dyn_buf_internal(s, 0);
 }
 
-int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
+int url_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(ByteIOContext *s, uint8_t **pbuffer)
+int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer)
 {
     DynBuffer *d = s->opaque;
     int size;
+    static const char padbuf[FF_INPUT_BUFFER_PADDING_SIZE] = {0};
+    int padding = 0;
+
+    /* don't attempt to pad fixed-size packet buffers */
+    if (!s->max_packet_size) {
+        avio_write(s, padbuf, sizeof(padbuf));
+        padding = FF_INPUT_BUFFER_PADDING_SIZE;
+    }
 
     put_flush_packet(s);
 
@@ -837,6 +1111,6 @@ int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
     size = d->size;
     av_free(d);
     av_free(s);
-    return size;
+    return size - padding;
 }
 #endif /* CONFIG_MUXERS || CONFIG_NETWORK */