cam: Extend BufferWriter to include a stream name in file path

To be able to write multiple buffers captured in the same request (and
hence having the same sequence number) the buffer writer needs to name
each file uniquely. Add a stream name to the writer function which the
buffer writer can add to the part of the pattern it already expands to
the sequence number. As cam only supports one stream, hard code the name
to stream0.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/cam/buffer_writer.cpp b/src/cam/buffer_writer.cpp
index 2d2258b4..e0374ffc 100644
--- a/src/cam/buffer_writer.cpp
+++ b/src/cam/buffer_writer.cpp
@@ -19,7 +19,8 @@ BufferWriter::BufferWriter(const std::string &pattern)
 {
 }
 
-int BufferWriter::write(libcamera::Buffer *buffer)
+int BufferWriter::write(libcamera::Buffer *buffer,
+			const std::string &streamName)
 {
 	std::string filename;
 	size_t pos;
@@ -29,7 +30,8 @@ int BufferWriter::write(libcamera::Buffer *buffer)
 	pos = filename.find_first_of('#');
 	if (pos != std::string::npos) {
 		std::stringstream ss;
-		ss << std::setw(6) << std::setfill('0') << buffer->sequence();
+		ss << streamName << "-" << std::setw(6)
+		   << std::setfill('0') << buffer->sequence();
 		filename.replace(pos, 1, ss.str());
 	}