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[130.235.135.183]) by smtp.gmail.com with ESMTPSA id s25-20020a197719000000b0044a52a63b0csm719290lfc.33.2022.03.25.07.12.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Mar 2022 07:12:25 -0700 (PDT) From: Diederick Niehorster To: ffmpeg-devel@ffmpeg.org Date: Fri, 25 Mar 2022 15:10:31 +0100 Message-Id: <20220325141041.1748-13-dcnieho@gmail.com> X-Mailer: git-send-email 2.28.0.windows.1 In-Reply-To: <20220325141041.1748-1-dcnieho@gmail.com> References: <20220325141041.1748-1-dcnieho@gmail.com> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH v4 12/22] avdevice: Add internal helpers for querying device capabilities X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Cc: Diederick Niehorster Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" X-TUID: si85Taj1PmFn Signed-off-by: Diederick Niehorster --- libavdevice/internal.h | 31 +++++++++++++++++++++++++++ libavdevice/utils.c | 48 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 79 insertions(+) diff --git a/libavdevice/internal.h b/libavdevice/internal.h index bef3a4bd2d..eee493a4c7 100644 --- a/libavdevice/internal.h +++ b/libavdevice/internal.h @@ -58,4 +58,35 @@ struct AVDeviceCapabilitiesQuery { */ extern const AVOption ff_device_capabilities[]; +/** + * Enumeration indicating which device capability is being queried. + */ +enum AVDeviceCapabilitiesQueryType { + AV_DEV_CAP_QUERY_NONE = 0, + // both audio and video + AV_DEV_CAP_QUERY_CODEC, + // audio + AV_DEV_CAP_QUERY_SAMPLE_FORMAT, + AV_DEV_CAP_QUERY_SAMPLE_RATE, + AV_DEV_CAP_QUERY_CHANNELS, + AV_DEV_CAP_QUERY_CHANNEL_LAYOUT, + // video + AV_DEV_CAP_QUERY_PIXEL_FORMAT, + AV_DEV_CAP_QUERY_WINDOW_SIZE, + AV_DEV_CAP_QUERY_FRAME_SIZE, + AV_DEV_CAP_QUERY_FPS +}; + +/** + * Find AVDeviceCapabilitiesQueryType enumeration by means of options name. + * Returns AV_DEV_CAP_QUERY_NONE if not found. + */ +enum AVDeviceCapabilitiesQueryType ff_device_get_query_type(const char* option_name); + +/** + * Get component name from AVDeviceCapabilitiesQueryType enumeration and component index. + * (Some options have multiple components, e.g. AV_DEV_CAP_QUERY_FRAME_SIZE). + */ +const char* ff_device_get_query_component_name(enum AVDeviceCapabilitiesQueryType query_type, int component); + #endif diff --git a/libavdevice/utils.c b/libavdevice/utils.c index d9a52c53ab..de9023f215 100644 --- a/libavdevice/utils.c +++ b/libavdevice/utils.c @@ -19,6 +19,7 @@ #include "internal.h" #include "libavutil/opt.h" #include "libavformat/avformat.h" +#include "libavutil/avassert.h" int ff_alloc_input_device_context(AVFormatContext **avctx, const AVInputFormat *iformat, const char *format) { @@ -57,3 +58,50 @@ int ff_alloc_input_device_context(AVFormatContext **avctx, const AVInputFormat * avformat_free_context(s); return ret; } + +typedef struct AVDeviceCapabilitiesQueryTypeEntry { + const char* name; + enum AVDeviceCapabilitiesQueryType query_type; +} AVDeviceCapabilitiesQueryTypeEntry; + +static const AVDeviceCapabilitiesQueryTypeEntry query_table[] = { + // both audio and video + { "codec", AV_DEV_CAP_QUERY_CODEC }, + // audio + { "sample_format", AV_DEV_CAP_QUERY_SAMPLE_FORMAT }, + { "sample_rate", AV_DEV_CAP_QUERY_SAMPLE_RATE }, + { "channels", AV_DEV_CAP_QUERY_CHANNELS }, + { "channel_layout", AV_DEV_CAP_QUERY_CHANNEL_LAYOUT }, + // video + { "pixel_format", AV_DEV_CAP_QUERY_PIXEL_FORMAT }, + { "frame_size", AV_DEV_CAP_QUERY_FRAME_SIZE }, + { "window_size", AV_DEV_CAP_QUERY_WINDOW_SIZE }, + { "fps", AV_DEV_CAP_QUERY_FPS }, +}; + +enum AVDeviceCapabilitiesQueryType ff_device_get_query_type(const char* option_name) +{ + for (int i = 0; i < FF_ARRAY_ELEMS(query_table); ++i) { + if (!strcmp(query_table[i].name, option_name)) + return query_table[i].query_type; + } + // not found + return AV_DEV_CAP_QUERY_NONE; +} + +const char* ff_device_get_query_component_name(enum AVDeviceCapabilitiesQueryType query_type, int component) +{ + if (query_type == AV_DEV_CAP_QUERY_WINDOW_SIZE || query_type == AV_DEV_CAP_QUERY_FRAME_SIZE) { + // special case: different name for each component + return component == 0 ? "pixel_count" : (component == 1 ? "width" : (component == 2 ? "height" : "")); + } + else { + av_assert0(component == 0); + for (int i = 0; i < FF_ARRAY_ELEMS(query_table); ++i) { + if (query_table[i].query_type == query_type) + return query_table[i].name; + } + } + // not found + return NULL; +} \ No newline at end of file