[libcamera-devel] [PATCH v3 03/10] libcamera: ipu3: Breakout stream assignment to new function
Jacopo Mondi
jacopo at jmondi.org
Wed Jun 24 11:39:42 CEST 2020
Hi Niklas,
On Tue, Jun 23, 2020 at 04:09:23AM +0200, Niklas Söderlund wrote:
> Selecting which stream is the most suitable for the requested
> configuration is mixed with adjusting the requested format when
> validating configurations. This is hard to read and got worse when
> support for Bayer formats was added. Break it out to a separate
> function.
>
> Signed-off-by: Niklas Söderlund <niklas.soderlund at ragnatech.se>
> Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> ---
> * Changes since v2
> - Document the fact that the number of requested streams in config_
> should be validated before calling assignStreams(). Add an ASSERT()
> and comment to catch the issue early if this should ever change.
>
> * Changes since v1
> - Update commit message.
> - Rename updateStreams() to assignStreams().
> - Revert and keep old comment on how streams are picked.
> - Do not modify behavior on how streams are picked which means
> assignStreams() now can't fail so no need for it to return an int,
> switch to void.
> ---
> src/libcamera/pipeline/ipu3/ipu3.cpp | 88 ++++++++++++++++------------
> 1 file changed, 52 insertions(+), 36 deletions(-)
>
> diff --git a/src/libcamera/pipeline/ipu3/ipu3.cpp b/src/libcamera/pipeline/ipu3/ipu3.cpp
> index c525e30a5ad35011..3b2ec684244881e5 100644
> --- a/src/libcamera/pipeline/ipu3/ipu3.cpp
> +++ b/src/libcamera/pipeline/ipu3/ipu3.cpp
> @@ -191,6 +191,7 @@ private:
> static constexpr unsigned int IPU3_BUFFER_COUNT = 4;
> static constexpr unsigned int IPU3_MAX_STREAMS = 3;
>
> + void assignStreams();
> void adjustStream(StreamConfiguration &cfg, bool scale);
>
> /*
> @@ -257,6 +258,50 @@ IPU3CameraConfiguration::IPU3CameraConfiguration(Camera *camera,
> data_ = data;
> }
>
> +void IPU3CameraConfiguration::assignStreams()
> +{
> + /*
> + * Verify and update all configuration entries, and assign a stream to
> + * each of them. The viewfinder stream can scale, while the output
> + * stream can crop only, so select the output stream when the requested
> + * resolution is equal to the sensor resolution, and the viewfinder
> + * stream otherwise.
> + */
> + std::set<const IPU3Stream *> availableStreams = {
> + &data_->outStream_,
> + &data_->vfStream_,
> + &data_->rawStream_,
> + };
> +
> + /*
> + * The caller is responsible to limit the number of requested streams
> + * to a number supported by the pipeline before calling this function.
> + */
> + ASSERT(availableStreams.size() >= config_.size());
> +
> + streams_.clear();
> + streams_.reserve(config_.size());
> +
> + for (const StreamConfiguration &cfg : config_) {
> + const PixelFormatInfo &info =
> + PixelFormatInfo::info(cfg.pixelFormat);
> + const IPU3Stream *stream;
> +
> + if (info.colourEncoding == PixelFormatInfo::ColourEncodingRAW)
> + stream = &data_->rawStream_;
> + else if (cfg.size == sensorFormat_.size)
> + stream = &data_->outStream_;
> + else
> + stream = &data_->vfStream_;
> +
> + if (availableStreams.find(stream) == availableStreams.end())
> + stream = *availableStreams.begin();
I understand this was here already, but it's worth pointing it out
anyway: doesn't this allow an application to require 3 YUV streams ?
Once we have assigned vfStream and outStream to the first two, the
last one will be assigned to rawStream, which should not happen.
> +
> + streams_.push_back(stream);
> + availableStreams.erase(stream);
> + }
> +}
> +
> void IPU3CameraConfiguration::adjustStream(StreamConfiguration &cfg, bool scale)
> {
> /* The only pixel format the driver supports is NV12. */
> @@ -343,41 +388,14 @@ CameraConfiguration::Status IPU3CameraConfiguration::validate()
> if (!sensorFormat_.size.width || !sensorFormat_.size.height)
> sensorFormat_.size = sensor->resolution();
>
> - /*
> - * Verify and update all configuration entries, and assign a stream to
> - * each of them. The viewfinder stream can scale, while the output
> - * stream can crop only, so select the output stream when the requested
> - * resolution is equal to the sensor resolution, and the viewfinder
> - * stream otherwise.
> - */
> - std::set<const IPU3Stream *> availableStreams = {
> - &data_->outStream_,
> - &data_->vfStream_,
> - &data_->rawStream_,
> - };
> -
> - streams_.clear();
> - streams_.reserve(config_.size());
> + /* Assign streams to each configuration entry. */
> + assignStreams();
>
> + /* Verify and adjust configuration if needed. */
> for (unsigned int i = 0; i < config_.size(); ++i) {
> StreamConfiguration &cfg = config_[i];
> - const PixelFormat pixelFormat = cfg.pixelFormat;
> - const PixelFormatInfo &info = PixelFormatInfo::info(pixelFormat);
> - const Size size = cfg.size;
> - const IPU3Stream *stream;
> -
> - if (info.colourEncoding == PixelFormatInfo::ColourEncodingRAW)
> - stream = &data_->rawStream_;
> - else if (cfg.size == sensorFormat_.size)
> - stream = &data_->outStream_;
> - else
> - stream = &data_->vfStream_;
> -
> - if (availableStreams.find(stream) == availableStreams.end())
> - stream = *availableStreams.begin();
> -
> - LOG(IPU3, Debug)
> - << "Assigned '" << stream->name_ << "' to stream " << i;
> + const StreamConfiguration oldCfg = cfg;
> + const IPU3Stream *stream = streams_[i];
>
> if (stream->raw_) {
> const auto &itFormat =
> @@ -394,15 +412,13 @@ CameraConfiguration::Status IPU3CameraConfiguration::validate()
>
> cfg.bufferCount = IPU3_BUFFER_COUNT;
>
> - if (cfg.pixelFormat != pixelFormat || cfg.size != size) {
> + if (cfg.pixelFormat != oldCfg.pixelFormat ||
> + cfg.size != oldCfg.size) {
> LOG(IPU3, Debug)
> << "Stream " << i << " configuration adjusted to "
> << cfg.toString();
> status = Adjusted;
> }
> -
> - streams_.push_back(stream);
> - availableStreams.erase(stream);
The rest looks good.
Reviewed-by: Jacopo Mondi <jacopo at jmondi.org>
Thanks
j
> }
>
> return status;
> --
> 2.27.0
>
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