X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Faviobuf.c;h=6206c66909c3ce2519a89a80d6e7a79b1e7d28d7;hb=0b54f3c0878a3acaa9142e4f24942e762d97e350;hp=f6f65c1e13e698d24e7a18057f4e39d2ac7117ae;hpb=7cb8f314db095715698329fafae5eadeb5504610;p=ffmpeg

diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index f6f65c1e13e..6206c66909c 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -2,26 +2,32 @@
  * Buffered I/O for ffmpeg system
  * Copyright (c) 2000,2001 Fabrice Bellard
  *
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
  *
- * This library is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
+
+#include "libavutil/crc.h"
 #include "avformat.h"
 #include "avio.h"
 #include <stdarg.h>
 
 #define IO_BUFFER_SIZE 32768
 
+static void fill_buffer(ByteIOContext *s);
+
 int init_put_byte(ByteIOContext *s,
                   unsigned char *buffer,
                   int buffer_size,
@@ -34,11 +40,7 @@ int init_put_byte(ByteIOContext *s,
     s->buffer = buffer;
     s->buffer_size = buffer_size;
     s->buf_ptr = buffer;
-    s->write_flag = write_flag;
-    if (!s->write_flag) 
-        s->buf_end = buffer;
-    else
-        s->buf_end = buffer + buffer_size;
+    url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY);
     s->opaque = opaque;
     s->write_packet = write_packet;
     s->read_packet = read_packet;
@@ -50,11 +52,29 @@ int init_put_byte(ByteIOContext *s,
     s->is_streamed = 0;
     s->max_packet_size = 0;
     s->update_checksum= NULL;
+    if(!read_packet && !write_flag){
+        s->pos = buffer_size;
+        s->buf_end = s->buffer + buffer_size;
+    }
+    s->read_pause = NULL;
+    s->read_seek  = NULL;
     return 0;
 }
-                  
 
-#ifdef CONFIG_ENCODERS
+ByteIOContext *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),
+                  offset_t (*seek)(void *opaque, offset_t offset, int whence)) {
+    ByteIOContext *s = av_mallocz(sizeof(ByteIOContext));
+    init_put_byte(s, buffer, buffer_size, write_flag, opaque,
+                  read_packet, write_packet, seek);
+    return s;
+}
+
 static void flush_buffer(ByteIOContext *s)
 {
     if (s->buf_ptr > s->buffer) {
@@ -76,7 +96,7 @@ static void flush_buffer(ByteIOContext *s)
 void put_byte(ByteIOContext *s, int b)
 {
     *(s->buf_ptr)++ = b;
-    if (s->buf_ptr >= s->buf_end) 
+    if (s->buf_ptr >= s->buf_end)
         flush_buffer(s);
 }
 
@@ -91,7 +111,7 @@ void put_buffer(ByteIOContext *s, const unsigned char *buf, int size)
         memcpy(s->buf_ptr, buf, len);
         s->buf_ptr += len;
 
-        if (s->buf_ptr >= s->buf_end) 
+        if (s->buf_ptr >= s->buf_end)
             flush_buffer(s);
 
         buf += len;
@@ -104,61 +124,56 @@ void put_flush_packet(ByteIOContext *s)
     flush_buffer(s);
     s->must_flush = 0;
 }
-#endif //CONFIG_ENCODERS
 
 offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
 {
     offset_t offset1;
+    offset_t pos;
+
+    if(!s)
+        return AVERROR(EINVAL);
+
+    pos = s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
 
     if (whence != SEEK_CUR && whence != SEEK_SET)
-        return -EINVAL;
-    
-#ifdef CONFIG_ENCODERS
-    if (s->write_flag) {
-        if (whence == SEEK_CUR) {
-            offset1 = s->pos + (s->buf_ptr - s->buffer);
-            if (offset == 0)
-                return offset1;
-            offset += offset1;
-        }
-        offset1 = offset - s->pos;
-        if (!s->must_flush && 
-            offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
-            /* can do the seek inside the buffer */
-            s->buf_ptr = s->buffer + offset1;
-        } else {
-            if (!s->seek)
-                return -EPIPE;
+        return AVERROR(EINVAL);
+
+    if (whence == SEEK_CUR) {
+        offset1 = pos + (s->buf_ptr - s->buffer);
+        if (offset == 0)
+            return offset1;
+        offset += offset1;
+    }
+    offset1 = offset - pos;
+    if (!s->must_flush &&
+        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)){
+        while(s->pos < offset && !s->eof_reached)
+            fill_buffer(s);
+        if (s->eof_reached)
+            return AVERROR(EPIPE);
+        s->buf_ptr = s->buf_end + offset - s->pos;
+    } else {
+        offset_t res = AVERROR(EPIPE);
+
+#if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
+        if (s->write_flag) {
             flush_buffer(s);
             s->must_flush = 1;
-            s->buf_ptr = s->buffer;
-            s->seek(s->opaque, offset, SEEK_SET);
-            s->pos = offset;
-        }
-    } else 
-#endif //CONFIG_ENCODERS
-    {
-        if (whence == SEEK_CUR) {
-            offset1 = s->pos - (s->buf_end - s->buffer) + (s->buf_ptr - s->buffer);
-            if (offset == 0)
-                return offset1;
-            offset += offset1;
-        }
-        offset1 = offset - (s->pos - (s->buf_end - s->buffer));
-        if (offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
-            /* can do the seek inside the buffer */
-            s->buf_ptr = s->buffer + offset1;
-        } else {
-            if (!s->seek)
-                return -EPIPE;
-            s->buf_ptr = s->buffer;
+        } else
+#endif /* defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK) */
+        {
             s->buf_end = s->buffer;
-            if (s->seek(s->opaque, offset, SEEK_SET) == (offset_t)-EPIPE)
-                return -EPIPE;
-            s->pos = offset;
         }
-        s->eof_reached = 0;
+        s->buf_ptr = s->buffer;
+        if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
+            return res;
+        s->pos = offset;
     }
+    s->eof_reached = 0;
     return offset;
 }
 
@@ -175,25 +190,36 @@ offset_t url_ftell(ByteIOContext *s)
 offset_t url_fsize(ByteIOContext *s)
 {
     offset_t size;
-    
+
+    if(!s)
+        return AVERROR(EINVAL);
+
     if (!s->seek)
-        return -EPIPE;
-    size = s->seek(s->opaque, -1, SEEK_END) + 1;
-    s->seek(s->opaque, s->pos, SEEK_SET);
+        return AVERROR(EPIPE);
+    size = s->seek(s->opaque, 0, AVSEEK_SIZE);
+    if(size<0){
+        if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
+            return size;
+        size++;
+        s->seek(s->opaque, s->pos, SEEK_SET);
+    }
     return size;
 }
 
 int url_feof(ByteIOContext *s)
 {
+    if(!s)
+        return 0;
     return s->eof_reached;
 }
 
 int url_ferror(ByteIOContext *s)
 {
+    if(!s)
+        return 0;
     return s->error;
 }
 
-#ifdef CONFIG_ENCODERS
 void put_le32(ByteIOContext *s, unsigned int val)
 {
     put_byte(s, val);
@@ -242,6 +268,12 @@ void put_be16(ByteIOContext *s, unsigned int val)
     put_byte(s, val);
 }
 
+void put_le24(ByteIOContext *s, unsigned int val)
+{
+    put_le16(s, val & 0xffff);
+    put_byte(s, val >> 16);
+}
+
 void put_be24(ByteIOContext *s, unsigned int val)
 {
     put_be16(s, val >> 8);
@@ -254,13 +286,12 @@ void put_tag(ByteIOContext *s, const char *tag)
         put_byte(s, *tag++);
     }
 }
-#endif //CONFIG_ENCODERS
 
 /* Input stream */
 
 static void fill_buffer(ByteIOContext *s)
 {
-    int len;
+    int len=0;
 
     /* no need to do anything if EOF already reached */
     if (s->eof_reached)
@@ -272,13 +303,14 @@ static void fill_buffer(ByteIOContext *s)
         s->checksum_ptr= s->buffer;
     }
 
-    len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
+    if(s->read_packet)
+        len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
     if (len <= 0) {
         /* do not modify buffer if EOF reached so that a seek back can
            be done without rereading data */
         s->eof_reached = 1;
-    if(len<0)
-        s->error= len;
+        if(len<0)
+            s->error= len;
     } else {
         s->pos += len;
         s->buf_ptr = s->buffer;
@@ -286,6 +318,10 @@ static void fill_buffer(ByteIOContext *s)
     }
 }
 
+unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
+    return av_crc(av_crc_get_table(AV_CRC_32_IEEE), checksum, buf, len);
+}
+
 unsigned long get_checksum(ByteIOContext *s){
     s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
     s->update_checksum= NULL;
@@ -295,13 +331,11 @@ unsigned long get_checksum(ByteIOContext *s){
 void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
     s->update_checksum= update_checksum;
     if(s->update_checksum){
-        s->checksum= s->update_checksum(checksum, NULL, 0);
+        s->checksum= checksum;
         s->checksum_ptr= s->buf_ptr;
     }
 }
 
-/* NOTE: return 0 if EOF, so you cannot use it if EOF handling is
-   necessary */
 /* XXX: put an inline version */
 int get_byte(ByteIOContext *s)
 {
@@ -316,7 +350,6 @@ int get_byte(ByteIOContext *s)
     }
 }
 
-/* NOTE: return URL_EOF (-1) if EOF */
 int url_fgetc(ByteIOContext *s)
 {
     if (s->buf_ptr < s->buf_end) {
@@ -341,7 +374,8 @@ int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
             len = size;
         if (len == 0) {
             if(size > s->buffer_size && !s->update_checksum){
-                len = s->read_packet(s->opaque, buf, size);
+                if(s->read_packet)
+                    len = s->read_packet(s->opaque, buf, size);
                 if (len <= 0) {
                     /* do not modify buffer if EOF reached so that a seek back can
                     be done without rereading data */
@@ -375,7 +409,7 @@ int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
 int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size)
 {
     int len;
-    
+
     if(size<0)
         return -1;
 
@@ -399,6 +433,14 @@ unsigned int get_le16(ByteIOContext *s)
     return val;
 }
 
+unsigned int get_le24(ByteIOContext *s)
+{
+    unsigned int val;
+    val = get_le16(s);
+    val |= get_byte(s) << 16;
+    return val;
+}
+
 unsigned int get_le32(ByteIOContext *s)
 {
     unsigned int val;
@@ -447,7 +489,7 @@ char *get_strz(ByteIOContext *s, char *buf, int maxlen)
         if (i < maxlen-1)
             buf[i++] = c;
     }
-    
+
     buf[i] = 0; /* Ensure null terminated, but may be truncated */
 
     return buf;
@@ -461,37 +503,23 @@ uint64_t get_be64(ByteIOContext *s)
     return val;
 }
 
-/* link with avio functions */
-
-#ifdef CONFIG_ENCODERS
-static int url_write_packet(void *opaque, uint8_t *buf, int buf_size)
-{
-    URLContext *h = opaque;
-    return url_write(h, buf, buf_size);
-}
-#else
-#define	url_write_packet NULL
-#endif //CONFIG_ENCODERS
-
-static int url_read_packet(void *opaque, uint8_t *buf, int buf_size)
-{
-    URLContext *h = opaque;
-    return url_read(h, buf, buf_size);
-}
+uint64_t ff_get_v(ByteIOContext *bc){
+    uint64_t val = 0;
+    int tmp;
 
-static offset_t url_seek_packet(void *opaque, offset_t offset, int whence)
-{
-    URLContext *h = opaque;
-    return url_seek(h, offset, whence);
-    //return 0;
+    do{
+        tmp = get_byte(bc);
+        val= (val<<7) + (tmp&127);
+    }while(tmp&128);
+    return val;
 }
 
-int url_fdopen(ByteIOContext *s, URLContext *h)
+int url_fdopen(ByteIOContext **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 */
@@ -500,41 +528,62 @@ int url_fdopen(ByteIOContext *s, URLContext *h)
     }
     buffer = av_malloc(buffer_size);
     if (!buffer)
-        return -ENOMEM;
+        return AVERROR(ENOMEM);
+
+    *s = av_mallocz(sizeof(ByteIOContext));
+    if(!*s) {
+        av_free(buffer);
+        return AVERROR(ENOMEM);
+    }
 
-    if (init_put_byte(s, buffer, buffer_size, 
+    if (init_put_byte(*s, buffer, buffer_size,
                       (h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
-                      url_read_packet, url_write_packet, url_seek_packet) < 0) {
+                      url_read, url_write, url_seek) < 0) {
         av_free(buffer);
-        return AVERROR_IO;
+        av_freep(s);
+        return AVERROR(EIO);
+    }
+    (*s)->is_streamed = h->is_streamed;
+    (*s)->max_packet_size = max_packet_size;
+    if(h->prot) {
+        (*s)->read_pause = (int (*)(void *, int))h->prot->url_read_pause;
+        (*s)->read_seek  = (offset_t (*)(void *, int, int64_t, int))h->prot->url_read_seek;
     }
-    s->is_streamed = h->is_streamed;
-    s->max_packet_size = max_packet_size;
     return 0;
 }
 
-/* XXX: must be called before any I/O */
 int url_setbufsize(ByteIOContext *s, int buf_size)
 {
     uint8_t *buffer;
     buffer = av_malloc(buf_size);
     if (!buffer)
-        return -ENOMEM;
+        return AVERROR(ENOMEM);
 
     av_free(s->buffer);
     s->buffer = buffer;
     s->buffer_size = buf_size;
     s->buf_ptr = buffer;
-    if (!s->write_flag) 
-        s->buf_end = buffer;
-    else
-        s->buf_end = buffer + buf_size;
+    url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
     return 0;
 }
 
-/* NOTE: when opened as read/write, the buffers are only used for
-   reading */
-int url_fopen(ByteIOContext *s, const char *filename, int flags)
+int url_resetbuf(ByteIOContext *s, int flags)
+{
+    URLContext *h = s->opaque;
+    if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
+        return AVERROR(EINVAL);
+
+    if (flags & URL_WRONLY) {
+        s->buf_end = s->buffer + s->buffer_size;
+        s->write_flag = 1;
+    } else {
+        s->buf_end = s->buffer;
+        s->write_flag = 0;
+    }
+    return 0;
+}
+
+int url_fopen(ByteIOContext **s, const char *filename, int flags)
 {
     URLContext *h;
     int err;
@@ -553,9 +602,9 @@ int url_fopen(ByteIOContext *s, const char *filename, int flags)
 int url_fclose(ByteIOContext *s)
 {
     URLContext *h = s->opaque;
-    
+
     av_free(s->buffer);
-    memset(s, 0, sizeof(ByteIOContext));
+    av_free(s);
     return url_close(h);
 }
 
@@ -564,8 +613,7 @@ URLContext *url_fileno(ByteIOContext *s)
     return s->opaque;
 }
 
-#ifdef CONFIG_ENCODERS
-/* XXX: currently size is limited */
+#ifdef CONFIG_MUXERS
 int url_fprintf(ByteIOContext *s, const char *fmt, ...)
 {
     va_list ap;
@@ -578,10 +626,8 @@ int url_fprintf(ByteIOContext *s, const char *fmt, ...)
     put_buffer(s, buf, strlen(buf));
     return ret;
 }
-#endif //CONFIG_ENCODERS
+#endif //CONFIG_MUXERS
 
-/* note: unlike fgets, the EOL character is not returned and a whole
-   line is parsed. return NULL if first char read was EOF */
 char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
 {
     int c;
@@ -603,29 +649,51 @@ char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
     return buf;
 }
 
-/* 
- * Return the maximum packet size associated to packetized buffered file
- * handle. If the file is not packetized (stream like http or file on
- * disk), then 0 is returned.
- * 
- * @param h buffered file handle
- * @return maximum packet size in bytes
- */
 int url_fget_max_packet_size(ByteIOContext *s)
 {
     return s->max_packet_size;
 }
 
-#ifdef CONFIG_ENCODERS
+int av_url_read_fpause(ByteIOContext *s, int pause)
+{
+    if (!s->read_pause)
+        return AVERROR(ENOSYS);
+    return s->read_pause(s->opaque, pause);
+}
+
+offset_t av_url_read_fseek(ByteIOContext *s,
+        int stream_index, int64_t timestamp, int flags)
+{
+    URLContext *h = s->opaque;
+    offset_t ret;
+    if (!s->read_seek)
+        return AVERROR(ENOSYS);
+    ret = s->read_seek(h, stream_index, timestamp, flags);
+    if(ret >= 0) {
+        s->buf_ptr = s->buf_end; // Flush buffer
+        s->pos = s->seek(h, 0, SEEK_CUR);
+    }
+    return ret;
+}
+
+/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
+ * back to the server even if CONFIG_MUXERS is not set. */
+#if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
 /* buffer handling */
-int url_open_buf(ByteIOContext *s, uint8_t *buf, int buf_size, int flags)
+int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags)
 {
-    return init_put_byte(s, buf, buf_size, 
-                         (flags & URL_WRONLY || flags & URL_RDWR),
-                         NULL, NULL, NULL, NULL);
+    int ret;
+    *s = av_mallocz(sizeof(ByteIOContext));
+    if(!*s)
+        return AVERROR(ENOMEM);
+    ret = init_put_byte(*s, buf, buf_size,
+                        (flags & URL_WRONLY || flags & URL_RDWR),
+                        NULL, NULL, NULL, NULL);
+    if(ret != 0)
+        av_freep(s);
+    return ret;
 }
 
-/* return the written or read size */
 int url_close_buf(ByteIOContext *s)
 {
     put_flush_packet(s);
@@ -645,7 +713,7 @@ static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
 {
     DynBuffer *d = opaque;
     int new_size, new_allocated_size;
-    
+
     /* reallocate buffer if needed */
     new_size = d->pos + buf_size;
     new_allocated_size = d->allocated_size;
@@ -655,9 +723,9 @@ static int dyn_buf_write(void *opaque, uint8_t *buf, int buf_size)
         if (!new_allocated_size)
             new_allocated_size = new_size;
         else
-            new_allocated_size += new_allocated_size / 2 + 1;    
+            new_allocated_size += new_allocated_size / 2 + 1;
     }
-    
+
     if (new_allocated_size > d->allocated_size) {
         d->buffer = av_realloc(d->buffer, new_allocated_size);
         if(d->buffer == NULL)
@@ -703,70 +771,56 @@ static offset_t dyn_buf_seek(void *opaque, offset_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(ByteIOContext **s, int max_packet_size)
 {
     DynBuffer *d;
     int io_buffer_size, ret;
-    
-    if (max_packet_size) 
+
+    if (max_packet_size)
         io_buffer_size = max_packet_size;
     else
         io_buffer_size = 1024;
-        
+
     if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
         return -1;
     d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
     if (!d)
         return -1;
+    *s = av_mallocz(sizeof(ByteIOContext));
+    if(!*s) {
+        av_free(d);
+        return AVERROR(ENOMEM);
+    }
     d->io_buffer_size = io_buffer_size;
     d->buffer = NULL;
     d->pos = 0;
     d->size = 0;
     d->allocated_size = 0;
-    ret = init_put_byte(s, d->io_buffer, io_buffer_size, 
-                        1, d, NULL, 
-                        max_packet_size ? dyn_packet_buf_write : dyn_buf_write, 
+    ret = init_put_byte(*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;
+        (*s)->max_packet_size = max_packet_size;
+    } else {
+        av_free(d);
+        av_freep(s);
     }
     return ret;
 }
 
-/*
- * Open a write only memory stream.
- * 
- * @param s new IO context
- * @return zero if no error.
- */
-int url_open_dyn_buf(ByteIOContext *s)
+int url_open_dyn_buf(ByteIOContext **s)
 {
     return url_open_dyn_buf_internal(s, 0);
 }
 
-/*
- * 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(ByteIOContext *s, int max_packet_size)
+int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size)
 {
     if (max_packet_size <= 0)
         return -1;
     return url_open_dyn_buf_internal(s, max_packet_size);
 }
 
-/* 
- * Return the written size and a pointer to the buffer. The buffer
- *  must be freed with av_free(). 
- * @param s IO context
- * @param pointer to a byte buffer
- * @return the length of the byte buffer
- */
 int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
 {
     DynBuffer *d = s->opaque;
@@ -777,6 +831,7 @@ int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
     *pbuffer = d->buffer;
     size = d->size;
     av_free(d);
+    av_free(s);
     return size;
 }
-#endif //CONFIG_ENCODERS
+#endif /* CONFIG_MUXERS || CONFIG_NETWORK */