Replace lena.pnm

[ffmpeg] / libavformat / avio_internal.h

diff --git a/libavformat/avio_internal.h b/libavformat/avio_internal.h
index 1369c438911853e506830f4e01f1c88178cd8e52..a8bcadd38b60ba22bd53eebe301291dc84f3a4ce 100644 (file)
--- a/libavformat/avio_internal.h
+++ b/libavformat/avio_internal.h
@@ -23,6 +23,10 @@
 #include "avio.h"
 #include "url.h"
 
+#include "libavutil/log.h"
+
+extern const AVClass ffio_url_class;
+
 int ffio_init_context(AVIOContext *s,
                   unsigned char *buffer,
                   int buffer_size,
@@ -33,6 +37,23 @@ int ffio_init_context(AVIOContext *s,
                   int64_t (*seek)(void *opaque, int64_t offset, int whence));
 
 
+/**
+ * Read size bytes from AVIOContext, returning a pointer.
+ * Note that the data pointed at by the returned pointer is only
+ * valid until the next call that references the same IO context.
+ * @param s IO context
+ * @param buf pointer to buffer into which to assemble the requested
+ *    data if it is not available in contiguous addresses in the
+ *    underlying buffer
+ * @param size number of bytes requested
+ * @param data address at which to store pointer: this will be a
+ *    a direct pointer into the underlying buffer if the requested
+ *    number of bytes are available at contiguous addresses, otherwise
+ *    will be a copy of buf
+ * @return number of bytes read or AVERROR
+ */
+int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data);
+
 /**
  * Read size bytes from AVIOContext into buf.
  * This reads at most 1 packet. If that is not enough fewer bytes will be
@@ -73,11 +94,13 @@ void ffio_init_checksum(AVIOContext *s,
 unsigned long ffio_get_checksum(AVIOContext *s);
 unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
                                     unsigned int len);
+unsigned long ff_crcA001_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.
+ * 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)
@@ -98,4 +121,22 @@ int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
  */
 int ffio_fdopen(AVIOContext **s, URLContext *h);
 
+/**
+ * Open a write-only fake memory stream. The written data is not stored
+ * anywhere - this is only used for measuring the amount of data
+ * written.
+ *
+ * @param s new IO context
+ * @return zero if no error.
+ */
+int ffio_open_null_buf(AVIOContext **s);
+
+/**
+ * Close a null buffer.
+ *
+ * @param s an IO context opened by ffio_open_null_buf
+ * @return the number of bytes written to the null buffer
+ */
+int ffio_close_null_buf(AVIOContext *s);
+
 #endif /* AVFORMAT_AVIO_INTERNAL_H */