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optimze copyRgbwToRgb, do not copy too much data into buffer

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This commit is contained in:
Phil Bolduc 2021-09-19 15:20:06 -07:00
parent 95c87919a8
commit 6472d35d91
1 changed files with 31 additions and 24 deletions
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53
wled00/DDP.cpp
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@ -4,6 +4,7 @@
**
** realtimeBrodacast(IPAddress client, uint16_t busLength, byte rgbwData[busLength][4]);
**
** http://www.3waylabs.com/ddp/
*/
#include <Arduino.h>
@ -32,24 +33,24 @@
//
// copies a 4 byte rgbw buffer to a 3 byte rgb buffer (skipping the w channel)
//
// destination - the buffer to write to
// source - the buffer to read from
// length - the number of 4 byte channels in the source buffer
// Parameters:
// destination - the buffer to write to must be able to hold length*3 bytes
// source - the buffer to read from
// length - the number of 4 byte channels in the source buffer
// Returns:
// the pointer in the source where we have copied up to
//
void copyRgbwToRgb(byte *destination, byte *source, uint16_t length) {
uint8_t* copyRgbwToRgb(uint8_t *destination, uint8_t *source, uint16_t length) {
uint16_t destinationOffset = 0;
uint16_t sourceOffset = 0;
for (uint16_t offset = 0; offset < length; offset++)
while (length--)
{
destination[destinationOffset+0] = source[sourceOffset+0];
destination[destinationOffset+1] = source[sourceOffset+1];
destination[destinationOffset+2] = source[sourceOffset+2];
destinationOffset += 3;
sourceOffset += 4;
*(destination++) = *(source++); // R
*(destination++) = *(source++); // G
*(destination++) = *(source++); // B
source++; // W
}
return source;
}
//
@ -59,7 +60,7 @@ void copyRgbwToRgb(byte *destination, byte *source, uint16_t length) {
// busLength - the number of pixels
// rgbwData - a buffer of at least busLength*4 bytes long
//
uint8_t realtimeBrodacast(IPAddress client, uint16_t busLength, byte *rgbwData) {
uint8_t realtimeBrodacast(IPAddress client, uint16_t busLength, uint8_t *rgbwData) {
WiFiUDP ddpUdp;
@ -71,8 +72,8 @@ uint8_t realtimeBrodacast(IPAddress client, uint16_t busLength, byte *rgbwData)
}
// allocate a buffer for the UDP packet
size_t bufferSize = DDP_HEADER_LEN + DDP_CHANNELS_PER_PACKET ;
byte* buffer = (byte*)malloc(bufferSize);
size_t bufferSize = (DDP_HEADER_LEN + DDP_CHANNELS_PER_PACKET) * sizeof(uint8_t);
uint8_t* buffer = (byte*)malloc(bufferSize);
if (!buffer) {
return 1;
}
@ -87,13 +88,19 @@ uint8_t realtimeBrodacast(IPAddress client, uint16_t busLength, byte *rgbwData)
// there are 3 channels per RGB pixel
int channel = 0; // TODO: allow specifying the start channel
for (int packetIndex = 0; packetIndex < packetCount; packetIndex++) {
// if we need to split
//
//
for (uint16_t currentPacket = 0; currentPacket < packetCount; currentPacket++) {
// how much data is after the header
uint16_t packetSize = DDP_CHANNELS_PER_PACKET;
if (packetIndex == (packetCount -1)) {
if (currentPacket == (packetCount - 1)) {
// last packet, set the push flag
// TODO: determine if we want to send an empty push packet to each destination after sending the pixel data
buffer[0] = DDP_FLAGS1_VER1 | DDP_FLAGS1_PUSH;
if (channelCount % DDP_CHANNELS_PER_PACKET) {
@ -101,18 +108,18 @@ uint8_t realtimeBrodacast(IPAddress client, uint16_t busLength, byte *rgbwData)
}
}
//offset
// data offset in bytes, 32-bit number, MSB first
buffer[4] = (channel & 0xFF000000) >> 24;
buffer[5] = (channel & 0xFF0000) >> 16;
buffer[6] = (channel & 0xFF00) >> 8;
buffer[7] = (channel & 0xFF);
//size
// data length in bytes, 16-bit number, MSB first
buffer[8] = (packetSize & 0xFF00) >> 8;
buffer[9] = packetSize & 0xFF;
// copy the data into our buffer
copyRgbwToRgb(&buffer[DDP_HEADER_LEN], rgbwData, busLength);
// copy the data from the source buffer into our pack
rgbwData = copyRgbwToRgb(&buffer[DDP_HEADER_LEN], rgbwData, packetSize);
ddpUdp.beginPacket(client, DDP_PORT);
ddpUdp.write(buffer, packetSize);