From 38bff0c82bf18e7bc7a35a5395ccdc8078797f30 Mon Sep 17 00:00:00 2001 From: Jacopo Mondi Date: Wed, 18 May 2022 19:19:17 +0200 Subject: cam: Add a parser for capture scripts Add a parser class to the cam test application to control the capture operations through a yaml script. The capture script currently allow to specify a list of controls and their associated values to be applied per-frame. Also add a trivial capture script example to showcase the intended script structure. Signed-off-by: Jacopo Mondi Signed-off-by: Laurent Pinchart Reviewed-by: Jacopo Mondi --- src/cam/capture-script.yaml | 46 ++++++ src/cam/capture_script.cpp | 336 ++++++++++++++++++++++++++++++++++++++++++++ src/cam/capture_script.h | 62 ++++++++ src/cam/meson.build | 2 + 4 files changed, 446 insertions(+) create mode 100644 src/cam/capture-script.yaml create mode 100644 src/cam/capture_script.cpp create mode 100644 src/cam/capture_script.h (limited to 'src/cam') diff --git a/src/cam/capture-script.yaml b/src/cam/capture-script.yaml new file mode 100644 index 00000000..6a749bc6 --- /dev/null +++ b/src/cam/capture-script.yaml @@ -0,0 +1,46 @@ +# SPDX-License-Identifier: CC0-1.0 + +# Capture script example +# +# A capture script allows to associate a list of controls and their values +# to frame numbers. + +# \todo Formally define the capture script structure with a schema + +# Notes: +# - Controls have to be specified by name, as defined in the +# libcamera::controls:: enumeration +# - Controls not supported by the camera currently operated are ignored +# - Frame numbers shall be monotonically incrementing, gaps are allowed + +# Example: +frames: + - 1: + Brightness: 0.0 + + - 40: + Brightness: 0.2 + + - 80: + Brightness: 0.4 + + - 120: + Brightness: 0.8 + + - 160: + Brightness: 0.4 + + - 200: + Brightness: 0.2 + + - 240: + Brightness: 0.0 + + - 280: + Brightness: -0.2 + + - 300: + Brightness: -0.4 + + - 340: + Brightness: -0.8 diff --git a/src/cam/capture_script.cpp b/src/cam/capture_script.cpp new file mode 100644 index 00000000..9f22d5f7 --- /dev/null +++ b/src/cam/capture_script.cpp @@ -0,0 +1,336 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2022, Ideas on Board Oy + * + * capture_script.cpp - Capture session configuration script + */ + +#include "capture_script.h" + +#include +#include +#include + +using namespace libcamera; + +CaptureScript::CaptureScript(std::shared_ptr camera, + const std::string &fileName) + : camera_(camera), valid_(false) +{ + FILE *fh = fopen(fileName.c_str(), "r"); + if (!fh) { + int ret = -errno; + std::cerr << "Failed to open capture script " << fileName + << ": " << strerror(-ret) << std::endl; + return; + } + + /* + * Map the camera's controls to their name so that they can be + * easily identified when parsing the script file. + */ + for (const auto &[control, info] : camera_->controls()) + controls_[control->name()] = control; + + int ret = parseScript(fh); + fclose(fh); + if (ret) + return; + + valid_ = true; +} + +/* Retrieve the control list associated with a frame number. */ +const ControlList &CaptureScript::frameControls(unsigned int frame) +{ + static ControlList controls{}; + + auto it = frameControls_.find(frame); + if (it == frameControls_.end()) + return controls; + + return it->second; +} + +CaptureScript::EventPtr CaptureScript::nextEvent(yaml_event_type_t expectedType) +{ + EventPtr event(new yaml_event_t); + + if (!yaml_parser_parse(&parser_, event.get())) + return nullptr; + + if (expectedType != YAML_NO_EVENT && !checkEvent(event, expectedType)) + return nullptr; + + return event; +} + +bool CaptureScript::checkEvent(const EventPtr &event, yaml_event_type_t expectedType) const +{ + if (event->type != expectedType) { + std::cerr << "Capture script error on line " << event->start_mark.line + << " column " << event->start_mark.column << ": " + << "Expected " << eventTypeName(expectedType) + << " event, got " << eventTypeName(event->type) + << std::endl; + return false; + } + + return true; +} + +std::string CaptureScript::eventScalarValue(const EventPtr &event) +{ + return std::string(reinterpret_cast(event->data.scalar.value), + event->data.scalar.length); +} + +std::string CaptureScript::eventTypeName(yaml_event_type_t type) +{ + static const std::map typeNames = { + { YAML_STREAM_START_EVENT, "stream-start" }, + { YAML_STREAM_END_EVENT, "stream-end" }, + { YAML_DOCUMENT_START_EVENT, "document-start" }, + { YAML_DOCUMENT_END_EVENT, "document-end" }, + { YAML_ALIAS_EVENT, "alias" }, + { YAML_SCALAR_EVENT, "scalar" }, + { YAML_SEQUENCE_START_EVENT, "sequence-start" }, + { YAML_SEQUENCE_END_EVENT, "sequence-end" }, + { YAML_MAPPING_START_EVENT, "mapping-start" }, + { YAML_MAPPING_END_EVENT, "mapping-end" }, + }; + + auto it = typeNames.find(type); + if (it == typeNames.end()) + return "[type " + std::to_string(type) + "]"; + + return it->second; +} + +int CaptureScript::parseScript(FILE *script) +{ + int ret = yaml_parser_initialize(&parser_); + if (!ret) { + std::cerr << "Failed to initialize yaml parser" << std::endl; + return ret; + } + + /* Delete the parser upon function exit. */ + struct ParserDeleter { + ParserDeleter(yaml_parser_t *parser) : parser_(parser) { } + ~ParserDeleter() { yaml_parser_delete(parser_); } + yaml_parser_t *parser_; + } deleter(&parser_); + + yaml_parser_set_input_file(&parser_, script); + + EventPtr event = nextEvent(YAML_STREAM_START_EVENT); + if (!event) + return -EINVAL; + + event = nextEvent(YAML_DOCUMENT_START_EVENT); + if (!event) + return -EINVAL; + + event = nextEvent(YAML_MAPPING_START_EVENT); + if (!event) + return -EINVAL; + + while (1) { + event = nextEvent(); + if (!event) + return -EINVAL; + + if (event->type == YAML_MAPPING_END_EVENT) + return 0; + + if (!checkEvent(event, YAML_SCALAR_EVENT)) + return -EINVAL; + + std::string section = eventScalarValue(event); + + if (section == "frames") { + parseFrames(); + } else { + std::cerr << "Unsupported section '" << section << "'" + << std::endl; + return -EINVAL; + } + } +} + +int CaptureScript::parseFrames() +{ + EventPtr event = nextEvent(YAML_SEQUENCE_START_EVENT); + if (!event) + return -EINVAL; + + while (1) { + event = nextEvent(); + if (!event) + return -EINVAL; + + if (event->type == YAML_SEQUENCE_END_EVENT) + return 0; + + int ret = parseFrame(std::move(event)); + if (ret) + return ret; + } +} + +int CaptureScript::parseFrame(EventPtr event) +{ + if (!checkEvent(event, YAML_MAPPING_START_EVENT)) + return -EINVAL; + + std::string key = parseScalar(); + if (key.empty()) + return -EINVAL; + + unsigned int frameId = atoi(key.c_str()); + + event = nextEvent(YAML_MAPPING_START_EVENT); + if (!event) + return -EINVAL; + + ControlList controls{}; + + while (1) { + event = nextEvent(); + if (!event) + return -EINVAL; + + if (event->type == YAML_MAPPING_END_EVENT) + break; + + int ret = parseControl(std::move(event), controls); + if (ret) + return ret; + } + + frameControls_[frameId] = std::move(controls); + + event = nextEvent(YAML_MAPPING_END_EVENT); + if (!event) + return -EINVAL; + + return 0; +} + +int CaptureScript::parseControl(EventPtr event, ControlList &controls) +{ + /* We expect a value after a key. */ + std::string name = eventScalarValue(event); + if (name.empty()) + return -EINVAL; + + /* If the camera does not support the control just ignore it. */ + auto it = controls_.find(name); + if (it == controls_.end()) { + std::cerr << "Unsupported control '" << name << "'" << std::endl; + return -EINVAL; + } + + std::string value = parseScalar(); + if (value.empty()) + return -EINVAL; + + const ControlId *controlId = it->second; + ControlValue val = unpackControl(controlId, value); + controls.set(controlId->id(), val); + + return 0; +} + +std::string CaptureScript::parseScalar() +{ + EventPtr event = nextEvent(YAML_SCALAR_EVENT); + if (!event) + return ""; + + return eventScalarValue(event); +} + +void CaptureScript::unpackFailure(const ControlId *id, const std::string &repr) +{ + static const std::map typeNames = { + { ControlTypeNone, "none" }, + { ControlTypeBool, "bool" }, + { ControlTypeByte, "byte" }, + { ControlTypeInteger32, "int32" }, + { ControlTypeInteger64, "int64" }, + { ControlTypeFloat, "float" }, + { ControlTypeString, "string" }, + { ControlTypeRectangle, "Rectangle" }, + { ControlTypeSize, "Size" }, + }; + + const char *typeName; + auto it = typeNames.find(id->type()); + if (it != typeNames.end()) + typeName = it->second; + else + typeName = "unknown"; + + std::cerr << "Unsupported control '" << repr << "' for " + << typeName << " control " << id->name() << std::endl; +} + +ControlValue CaptureScript::unpackControl(const ControlId *id, + const std::string &repr) +{ + ControlValue value{}; + + switch (id->type()) { + case ControlTypeNone: + break; + case ControlTypeBool: { + bool val; + + if (repr == "true") { + val = true; + } else if (repr == "false") { + val = false; + } else { + unpackFailure(id, repr); + return value; + } + + value.set(val); + break; + } + case ControlTypeByte: { + uint8_t val = strtol(repr.c_str(), NULL, 10); + value.set(val); + break; + } + case ControlTypeInteger32: { + int32_t val = strtol(repr.c_str(), NULL, 10); + value.set(val); + break; + } + case ControlTypeInteger64: { + int64_t val = strtoll(repr.c_str(), NULL, 10); + value.set(val); + break; + } + case ControlTypeFloat: { + float val = strtof(repr.c_str(), NULL); + value.set(val); + break; + } + case ControlTypeString: { + value.set(repr); + break; + } + case ControlTypeRectangle: + /* \todo Parse rectangles. */ + break; + case ControlTypeSize: + /* \todo Parse Sizes. */ + break; + } + + return value; +} diff --git a/src/cam/capture_script.h b/src/cam/capture_script.h new file mode 100644 index 00000000..8b4f8f62 --- /dev/null +++ b/src/cam/capture_script.h @@ -0,0 +1,62 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2022, Ideas on Board Oy + * + * capture_script.h - Capture session configuration script + */ + +#pragma once + +#include +#include +#include + +#include +#include + +#include + +class CaptureScript +{ +public: + CaptureScript(std::shared_ptr camera, + const std::string &fileName); + + bool valid() const { return valid_; } + + const libcamera::ControlList &frameControls(unsigned int frame); + +private: + struct EventDeleter { + void operator()(yaml_event_t *event) const + { + yaml_event_delete(event); + delete event; + } + }; + using EventPtr = std::unique_ptr; + + std::map controls_; + std::map frameControls_; + std::shared_ptr camera_; + yaml_parser_t parser_; + bool valid_; + + EventPtr nextEvent(yaml_event_type_t expectedType = YAML_NO_EVENT); + bool checkEvent(const EventPtr &event, yaml_event_type_t expectedType) const; + static std::string eventScalarValue(const EventPtr &event); + static std::string eventTypeName(yaml_event_type_t type); + + int parseScript(FILE *script); + + int parseFrames(); + int parseFrame(EventPtr event); + int parseControl(EventPtr event, libcamera::ControlList &controls); + + std::string parseScalar(); + + void unpackFailure(const libcamera::ControlId *id, + const std::string &repr); + libcamera::ControlValue unpackControl(const libcamera::ControlId *id, + const std::string &repr); +}; diff --git a/src/cam/meson.build b/src/cam/meson.build index 5bab8c9e..c47a8559 100644 --- a/src/cam/meson.build +++ b/src/cam/meson.build @@ -11,6 +11,7 @@ cam_enabled = true cam_sources = files([ 'camera_session.cpp', + 'capture_script.cpp', 'event_loop.cpp', 'file_sink.cpp', 'frame_sink.cpp', @@ -38,6 +39,7 @@ cam = executable('cam', cam_sources, libcamera_public, libdrm, libevent, + libyaml, ], cpp_args : cam_cpp_args, install : true) -- cgit v1.2.1