@@ -1705,6 +1705,7 @@ EXAMPLE_LIST="
decode_audio_example
decode_video_example
demuxing_decoding_example
+ device_get_capabilities_example
encode_audio_example
encode_video_example
extract_mvs_example
@@ -3712,6 +3713,7 @@ avio_reading_deps="avformat avcodec avutil"
decode_audio_example_deps="avcodec avutil"
decode_video_example_deps="avcodec avutil"
demuxing_decoding_example_deps="avcodec avformat avutil"
+device_get_capabilities_example_deps="avdevice avformat avutil"
encode_audio_example_deps="avcodec avutil"
encode_video_example_deps="avcodec avutil"
extract_mvs_example_deps="avcodec avformat avutil"
@@ -3,6 +3,7 @@
/decode_audio
/decode_video
/demuxing_decoding
+/device_get_capabilities
/encode_audio
/encode_video
/extract_mvs
@@ -1,26 +1,27 @@
-EXAMPLES-$(CONFIG_AVIO_LIST_DIR_EXAMPLE) += avio_list_dir
-EXAMPLES-$(CONFIG_AVIO_READING_EXAMPLE) += avio_reading
-EXAMPLES-$(CONFIG_DECODE_AUDIO_EXAMPLE) += decode_audio
-EXAMPLES-$(CONFIG_DECODE_VIDEO_EXAMPLE) += decode_video
-EXAMPLES-$(CONFIG_DEMUXING_DECODING_EXAMPLE) += demuxing_decoding
-EXAMPLES-$(CONFIG_ENCODE_AUDIO_EXAMPLE) += encode_audio
-EXAMPLES-$(CONFIG_ENCODE_VIDEO_EXAMPLE) += encode_video
-EXAMPLES-$(CONFIG_EXTRACT_MVS_EXAMPLE) += extract_mvs
-EXAMPLES-$(CONFIG_FILTER_AUDIO_EXAMPLE) += filter_audio
-EXAMPLES-$(CONFIG_FILTERING_AUDIO_EXAMPLE) += filtering_audio
-EXAMPLES-$(CONFIG_FILTERING_VIDEO_EXAMPLE) += filtering_video
-EXAMPLES-$(CONFIG_HTTP_MULTICLIENT_EXAMPLE) += http_multiclient
-EXAMPLES-$(CONFIG_HW_DECODE_EXAMPLE) += hw_decode
-EXAMPLES-$(CONFIG_METADATA_EXAMPLE) += metadata
-EXAMPLES-$(CONFIG_MUXING_EXAMPLE) += muxing
-EXAMPLES-$(CONFIG_QSVDEC_EXAMPLE) += qsvdec
-EXAMPLES-$(CONFIG_REMUXING_EXAMPLE) += remuxing
-EXAMPLES-$(CONFIG_RESAMPLING_AUDIO_EXAMPLE) += resampling_audio
-EXAMPLES-$(CONFIG_SCALING_VIDEO_EXAMPLE) += scaling_video
-EXAMPLES-$(CONFIG_TRANSCODE_AAC_EXAMPLE) += transcode_aac
-EXAMPLES-$(CONFIG_TRANSCODING_EXAMPLE) += transcoding
-EXAMPLES-$(CONFIG_VAAPI_ENCODE_EXAMPLE) += vaapi_encode
-EXAMPLES-$(CONFIG_VAAPI_TRANSCODE_EXAMPLE) += vaapi_transcode
+EXAMPLES-$(CONFIG_AVIO_LIST_DIR_EXAMPLE) += avio_list_dir
+EXAMPLES-$(CONFIG_AVIO_READING_EXAMPLE) += avio_reading
+EXAMPLES-$(CONFIG_DECODE_AUDIO_EXAMPLE) += decode_audio
+EXAMPLES-$(CONFIG_DECODE_VIDEO_EXAMPLE) += decode_video
+EXAMPLES-$(CONFIG_DEMUXING_DECODING_EXAMPLE) += demuxing_decoding
+EXAMPLES-$(CONFIG_DEVICE_GET_CAPABILITIES_EXAMPLE) += device_get_capabilities
+EXAMPLES-$(CONFIG_ENCODE_AUDIO_EXAMPLE) += encode_audio
+EXAMPLES-$(CONFIG_ENCODE_VIDEO_EXAMPLE) += encode_video
+EXAMPLES-$(CONFIG_EXTRACT_MVS_EXAMPLE) += extract_mvs
+EXAMPLES-$(CONFIG_FILTER_AUDIO_EXAMPLE) += filter_audio
+EXAMPLES-$(CONFIG_FILTERING_AUDIO_EXAMPLE) += filtering_audio
+EXAMPLES-$(CONFIG_FILTERING_VIDEO_EXAMPLE) += filtering_video
+EXAMPLES-$(CONFIG_HTTP_MULTICLIENT_EXAMPLE) += http_multiclient
+EXAMPLES-$(CONFIG_HW_DECODE_EXAMPLE) += hw_decode
+EXAMPLES-$(CONFIG_METADATA_EXAMPLE) += metadata
+EXAMPLES-$(CONFIG_MUXING_EXAMPLE) += muxing
+EXAMPLES-$(CONFIG_QSVDEC_EXAMPLE) += qsvdec
+EXAMPLES-$(CONFIG_REMUXING_EXAMPLE) += remuxing
+EXAMPLES-$(CONFIG_RESAMPLING_AUDIO_EXAMPLE) += resampling_audio
+EXAMPLES-$(CONFIG_SCALING_VIDEO_EXAMPLE) += scaling_video
+EXAMPLES-$(CONFIG_TRANSCODE_AAC_EXAMPLE) += transcode_aac
+EXAMPLES-$(CONFIG_TRANSCODING_EXAMPLE) += transcoding
+EXAMPLES-$(CONFIG_VAAPI_ENCODE_EXAMPLE) += vaapi_encode
+EXAMPLES-$(CONFIG_VAAPI_TRANSCODE_EXAMPLE) += vaapi_transcode
EXAMPLES := $(EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)$(EXESUF))
EXAMPLES_G := $(EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)_g$(EXESUF))
@@ -16,6 +16,7 @@ EXAMPLES= avio_list_dir \
decode_audio \
decode_video \
demuxing_decoding \
+ device_get_capabilities \
encode_audio \
encode_video \
extract_mvs \
new file mode 100644
@@ -0,0 +1,151 @@
+/*
+ * Copyright (c) 2021 Diederick Niehorster
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/**
+ * @file
+ * avdevice getting capabilities example.
+ *
+ * Shows how to use the avdevice capabilities API to probe
+ * device capabilities (supported codecs, pixel formats, sample
+ * formats, resolutions, channel counts, etc)
+ * @example device_get_capabilities.c
+ */
+
+#include <libavdevice/avdevice.h>
+#include <libavutil/avstring.h>
+#include <libavformat/avformat.h>
+#include <libavutil/log.h>
+
+
+
+int main (int argc, char **argv)
+{
+ int ret = 0;
+ const char* dshow_input_name = NULL;
+ const char* query_cap = NULL;
+ const char* set_cap_name = NULL;
+ const char* set_cap_value = NULL;
+
+ const AVInputFormat* fmt = NULL;
+ AVFormatContext* fmt_ctx = NULL;
+ AVDeviceCapabilitiesQuery* caps = NULL;
+ AVOptionRanges* ranges = NULL;
+
+ if (argc != 5) {
+ fprintf(stderr, "usage: %s dshow_input_name query_cap set_cap_name set_cap_value\n"
+ "API example program to show how to use the avdevice\n"
+ "capabilities API to probe device capabilities \n"
+ "(supported codecs, pixel formats, sample formats,\n"
+ "resolutions, channel counts, etc).\n\n"
+ "example invocation: "
+ "%s video=\"Integrated Webcam\" frame_size pixel_format yuyv422",
+ argv[0], argv[0]);
+ exit(1);
+ }
+ dshow_input_name = argv[1];
+ query_cap = argv[2];
+ set_cap_name = argv[3];
+ set_cap_value = argv[4];
+
+ // make sure avdevices can be found
+ avdevice_register_all();
+ // find our device (capabilities API is currently
+ // only implemented for dshow device, so hardcode that)
+ fmt = av_find_input_format("dshow");
+
+ // since there is no equivalent of avformat_alloc_output_context2 for an input context,
+ // so we get this dirty code that users shouldn't have to write....
+ fmt_ctx = avformat_alloc_context();
+ fmt_ctx->url = av_strdup(dshow_input_name);
+ fmt_ctx->iformat = fmt;
+ if (fmt_ctx->iformat->priv_data_size > 0) {
+ if (!(fmt_ctx->priv_data = av_mallocz(fmt_ctx->iformat->priv_data_size))) {
+ ret = AVERROR(ENOMEM);
+ goto end;
+ }
+ if (fmt_ctx->iformat->priv_class) {
+ *(const AVClass**)fmt_ctx->priv_data = fmt_ctx->iformat->priv_class;
+ av_opt_set_defaults(fmt_ctx->priv_data);
+ }
+ }
+ // end dirty code
+
+ // query the capability without any filter set
+ ret = avdevice_capabilities_create(&caps, fmt_ctx, NULL);
+ if (ret < 0)
+ goto end;
+
+ ret = av_opt_query_ranges(&ranges, caps, query_cap, AV_OPT_MULTI_COMPONENT_RANGE);
+ if (ret < 0)
+ goto end;
+
+ for (int range_index = 0; range_index < ranges->nb_ranges; range_index++) {
+ for (int component_index = 0; component_index < ranges->nb_components; component_index++)
+ {
+ AVOptionRange *range = ranges->range[ranges->nb_ranges * component_index + range_index];
+ if (component_index > 0)
+ printf(", ");
+ printf("%s: %.2f -- %.2f", range->str, range->value_min, range->value_max);
+ }
+ printf("\n");
+ }
+ av_opt_freep_ranges(&ranges);
+
+ printf("=============\n");
+
+ // set one capability, which may filter out some returned capabilities
+ // (or all, if set to an invalid value)
+ ret = av_opt_set(caps, set_cap_name, set_cap_value, 0);
+ if (ret < 0)
+ goto end;
+
+ ret = av_opt_query_ranges(&ranges, caps, query_cap, AV_OPT_MULTI_COMPONENT_RANGE);
+ if (ret < 0)
+ goto end;
+
+ for (int range_index = 0; range_index < ranges->nb_ranges; range_index++) {
+ for (int component_index = 0; component_index < ranges->nb_components; component_index++)
+ {
+ AVOptionRange* range = ranges->range[ranges->nb_ranges * component_index + range_index];
+ if (component_index > 0)
+ printf(", ");
+ printf("%s: %.2f -- %.2f", range->str, range->value_min, range->value_max);
+ }
+ printf("\n");
+ }
+
+
+end:
+ av_opt_freep_ranges(&ranges);
+ avdevice_capabilities_free(&caps, fmt_ctx);
+
+ avformat_close_input(&fmt_ctx);
+
+ if (ret < 0) {
+ char a[AV_ERROR_MAX_STRING_SIZE] = { 0 };
+ av_make_error_string(a, AV_ERROR_MAX_STRING_SIZE, ret);
+
+ printf("!!Error: %s\n", a);
+ }
+
+ return ret < 0;
+}
Signed-off-by: Diederick Niehorster <dcnieho@gmail.com> --- configure | 2 + doc/examples/.gitignore | 1 + doc/examples/Makefile | 47 ++++---- doc/examples/Makefile.example | 1 + doc/examples/device_get_capabilities.c | 151 +++++++++++++++++++++++++ 5 files changed, 179 insertions(+), 23 deletions(-) create mode 100644 doc/examples/device_get_capabilities.c