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buffer: return processed number of bytes

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Make _fill, _extract and _memset return the actual number of bytes that were
handled in case the buffer size is less than the specified size.
This commit is contained in:
Wim Taymans 2011-08-16 18:29:29 +02:00
parent 8698a8c94e
commit aefa1c67f8
2 changed files with 40 additions and 25 deletions
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59
gst/gstbuffer.c
View file

@ -1034,21 +1034,25 @@ gst_buffer_unmap (GstBuffer * buffer, gpointer data, gsize size)
* @size: the size to fill
*
* Copy @size bytes from @src to @buffer at @offset.
*
* Returns: The amount of bytes copied. This value can be lower than @size
* when @buffer did not contain enough data.
*/
void
gsize
gst_buffer_fill (GstBuffer * buffer, gsize offset, gconstpointer src,
gsize size)
{
gsize i, len;
gsize i, len, left;
const guint8 *ptr = src;
g_return_if_fail (GST_IS_BUFFER (buffer));
g_return_if_fail (gst_buffer_is_writable (buffer));
g_return_if_fail (src != NULL);
g_return_val_if_fail (GST_IS_BUFFER (buffer), 0);
g_return_val_if_fail (gst_buffer_is_writable (buffer), 0);
g_return_val_if_fail (src != NULL, 0);
len = GST_BUFFER_MEM_LEN (buffer);
left = size;
for (i = 0; i < len && size > 0; i++) {
for (i = 0; i < len && left > 0; i++) {
guint8 *data;
gsize ssize, tocopy;
GstMemory *mem;
@ -1058,9 +1062,9 @@ gst_buffer_fill (GstBuffer * buffer, gsize offset, gconstpointer src,
data = gst_memory_map (mem, &ssize, NULL, GST_MAP_WRITE);
if (ssize > offset) {
/* we have enough */
tocopy = MIN (ssize - offset, size);
tocopy = MIN (ssize - offset, left);
memcpy (data + offset, ptr, tocopy);
size -= tocopy;
left -= tocopy;
ptr += tocopy;
offset = 0;
} else {
@ -1069,6 +1073,7 @@ gst_buffer_fill (GstBuffer * buffer, gsize offset, gconstpointer src,
}
gst_memory_unmap (mem, data, ssize);
}
return size - left;
}
/**
@ -1079,19 +1084,23 @@ gst_buffer_fill (GstBuffer * buffer, gsize offset, gconstpointer src,
* @size: the size to extract
*
* Copy @size bytes starting from @offset in @buffer to @dest.
*
* Returns: The amount of bytes extracted. This value can be lower than @size
* when @buffer did not contain enough data.
*/
void
gsize
gst_buffer_extract (GstBuffer * buffer, gsize offset, gpointer dest, gsize size)
{
gsize i, len;
gsize i, len, left;
guint8 *ptr = dest;
g_return_if_fail (GST_IS_BUFFER (buffer));
g_return_if_fail (dest != NULL);
g_return_val_if_fail (GST_IS_BUFFER (buffer), 0);
g_return_val_if_fail (dest != NULL, 0);
len = GST_BUFFER_MEM_LEN (buffer);
left = size;
for (i = 0; i < len && size > 0; i++) {
for (i = 0; i < len && left > 0; i++) {
guint8 *data;
gsize ssize, tocopy;
GstMemory *mem;
@ -1101,9 +1110,9 @@ gst_buffer_extract (GstBuffer * buffer, gsize offset, gpointer dest, gsize size)
data = gst_memory_map (mem, &ssize, NULL, GST_MAP_READ);
if (ssize > offset) {
/* we have enough */
tocopy = MIN (ssize - offset, size);
tocopy = MIN (ssize - offset, left);
memcpy (ptr, data + offset, tocopy);
size -= tocopy;
left -= tocopy;
ptr += tocopy;
offset = 0;
} else {
@ -1112,6 +1121,7 @@ gst_buffer_extract (GstBuffer * buffer, gsize offset, gpointer dest, gsize size)
}
gst_memory_unmap (mem, data, ssize);
}
return size - left;
}
/**
@ -1170,18 +1180,22 @@ gst_buffer_memcmp (GstBuffer * buffer, gsize offset, gconstpointer mem,
* @size: the size to set
*
* Fill @buf with @size bytes with @val starting from @offset.
*
* Returns: The amount of bytes filled. This value can be lower than @size
* when @buffer did not contain enough data.
*/
void
gsize
gst_buffer_memset (GstBuffer * buffer, gsize offset, guint8 val, gsize size)
{
gsize i, len;
gsize i, len, left;
g_return_if_fail (GST_IS_BUFFER (buffer));
g_return_if_fail (gst_buffer_is_writable (buffer));
g_return_val_if_fail (GST_IS_BUFFER (buffer), 0);
g_return_val_if_fail (gst_buffer_is_writable (buffer), 0);
len = GST_BUFFER_MEM_LEN (buffer);
left = size;
for (i = 0; i < len && size > 0; i++) {
for (i = 0; i < len && left > 0; i++) {
guint8 *data;
gsize ssize, toset;
GstMemory *mem;
@ -1191,9 +1205,9 @@ gst_buffer_memset (GstBuffer * buffer, gsize offset, guint8 val, gsize size)
data = gst_memory_map (mem, &ssize, NULL, GST_MAP_WRITE);
if (ssize > offset) {
/* we have enough */
toset = MIN (ssize - offset, size);
toset = MIN (ssize - offset, left);
memset (data + offset, val, toset);
size -= toset;
left -= toset;
offset = 0;
} else {
/* offset past buffer, skip */
@ -1201,6 +1215,7 @@ gst_buffer_memset (GstBuffer * buffer, gsize offset, guint8 val, gsize size)
}
gst_memory_unmap (mem, data, ssize);
}
return size - left;
}
/**

6
gst/gstbuffer.h
View file

@ -246,13 +246,13 @@ void gst_buffer_remove_memory_range (GstBuffer *buffer, guint idx, guint
*/
#define gst_buffer_remove_memory(b,i) gst_buffer_remove_memory_range ((b), (i), 1)
void gst_buffer_fill (GstBuffer *buffer, gsize offset,
gsize gst_buffer_fill (GstBuffer *buffer, gsize offset,
gconstpointer src, gsize size);
void gst_buffer_extract (GstBuffer *buffer, gsize offset,
gsize gst_buffer_extract (GstBuffer *buffer, gsize offset,
gpointer dest, gsize size);
gint gst_buffer_memcmp (GstBuffer *buffer, gsize offset,
gconstpointer mem, gsize size);
void gst_buffer_memset (GstBuffer *buffer, gsize offset,
gsize gst_buffer_memset (GstBuffer *buffer, gsize offset,
guint8 val, gsize size);
gsize gst_buffer_get_sizes (GstBuffer *buffer, gsize *offset, gsize *maxsize);