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Apply simple weighted averaging to download rate calculations.

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svn path=/trunk/netsurf/; revision=11081
This commit is contained in:
Steve Fryatt 2010-12-16 22:09:10 +00:00
parent d2b8d00cd3
commit 689123822a
1 changed files with 19 additions and 6 deletions
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25
riscos/download.c
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@ -100,6 +100,8 @@ struct gui_download_window {
struct timeval start_time; /**< Time download started. */
struct timeval last_time; /**< Time status was last updated. */
unsigned int last_received; /**< Value of received at last_time. */
float average_rate; /**< Moving average download rate. */
unsigned int average_points; /**< Number of points in the average. */
bool send_dataload; /**< Should send DataLoad message when finished */
wimp_message save_message; /**< Copy of wimp DataSaveAck message */
@ -245,6 +247,8 @@ struct gui_download_window *gui_download_window_create(download_context *ctx,
dw->last_time = dw->start_time;
dw->last_received = 0;
dw->file_type = 0;
dw->average_rate = 0;
dw->average_points = 0;
/* Get scheme from URL */
res = url_scheme(url, &scheme);
@ -429,7 +433,7 @@ struct gui_download_window *gui_download_window_create(download_context *ctx,
* \return NSERROR_OK on success, appropriate error otherwise
*/
nserror gui_download_window_data(struct gui_download_window *dw,
nserror gui_download_window_data(struct gui_download_window *dw,
const char *data, unsigned int size)
{
while (true) {
@ -437,7 +441,7 @@ nserror gui_download_window_data(struct gui_download_window *dw,
int unwritten;
os_error *error;
error = xosgbpb_writew(dw->file, (const byte *) data, size,
error = xosgbpb_writew(dw->file, (const byte *) data, size,
&unwritten);
if (error) {
LOG(("xosgbpb_writew: 0x%x: %s",
@ -534,12 +538,21 @@ void ro_gui_download_update_status(struct gui_download_window *dw)
if (dw->ctx) {
rate = (dw->received - dw->last_received) / dt;
received = human_friendly_bytesize(dw->received);
speed = human_friendly_bytesize(rate);
/* A simple 'modified moving average' download rate calculation
* to smooth out rate fluctuations: chosen for simplicity.
*/
dw->average_points++;
dw->average_rate =
((dw->average_points - 1) *
dw->average_rate + rate) /
dw->average_points;
speed = human_friendly_bytesize(dw->average_rate);
if (dw->total_size) {
float f;
if (rate) {
left = (dw->total_size - dw->received) / rate;
if (dw->average_rate > 0) {
left = (dw->total_size - dw->received) /
dw->average_rate;
sprintf(time, "%u:%.2u", left / 60, left % 60);
}
@ -1295,7 +1308,7 @@ bool ro_gui_download_save(struct gui_download_window *dw,
}
if (error) {
if (dw->ctx)
if (dw->ctx)
download_context_abort(dw->ctx);
gui_download_window_error(dw, error->errmess);
}