[FFmpeg-devel] [PATCH 3/3] opts: add list device sources/sinks options

[Lukasz Marek]

Allows to list sources/sinks of the devices that implement
that functionality.

Signed-off-by: Lukasz Marek <lukasz.m.luki2 at gmail.com>
---
 cmdutils.c             | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++
 cmdutils.h             | 12 +++++++
 cmdutils_common_opts.h |  6 ++++
 3 files changed, 107 insertions(+)

diff --git a/cmdutils.c b/cmdutils.c
index 67bb66e..defcf0a 100644
--- a/cmdutils.c
+++ b/cmdutils.c
@@ -2050,3 +2050,92 @@ void *grow_array(void *array, int elem_size, int *size, int new_size)
     }
     return array;
 }
+
+
+int show_sources(void *optctx, const char *opt, const char *arg)
+{
+#if CONFIG_AVDEVICE
+    AVDeviceInfoList *device_list = NULL;
+    AVFormatContext *dev = NULL;
+    AVInputFormat *fmt;
+    int ret, i;
+
+    if (!arg) {
+        printf("Device name is missing.\n");
+        return AVERROR(EINVAL);
+    }
+
+    fmt = av_find_input_format(arg);
+    if (!fmt || !fmt->priv_class  || !AV_IS_INPUT_DEVICE(fmt->priv_class->category)) {
+        printf("No such device: %s\n", arg);
+        return AVERROR(EINVAL);
+    }
+
+    if ((ret = avformat_open_input(&dev, NULL, fmt, NULL)) < 0) {
+        printf("Cannot open device: %s\n", arg);
+        goto fail;
+    }
+
+    if ((ret = avdevice_list_devices(dev, &device_list)) < 0) {
+        printf("Cannot list devices\n");
+        goto fail;
+    }
+    printf("Audo-detected sinks for %s:\n", arg);
+    for (i = 0; i < device_list->nb_devices; i++) {
+        printf("%s %s [%s]\n", device_list->default_device == i ? "*" : " ",
+               device_list->devices[i]->device_name, device_list->devices[i]->device_description);
+    }
+
+  fail:
+    avdevice_free_list_devices(&device_list);
+    avformat_close_input(&dev);
+    return ret;
+#else
+    printf("Configured without libavdevice\n");
+    return AVERROR(ENOSYS);
+#endif
+}
+
+int show_sinks(void *optctx, const char *opt, const char *arg)
+{
+#if CONFIG_AVDEVICE
+    AVDeviceInfoList *device_list = NULL;
+    AVFormatContext *dev = NULL;
+    AVOutputFormat *fmt;
+    int ret, i;
+
+    if (!arg) {
+        printf("Device name is missing.\n");
+        return AVERROR(EINVAL);
+    }
+
+    fmt = av_guess_format(arg, NULL, NULL);
+    if (!fmt || !fmt->priv_class  || !AV_IS_OUTPUT_DEVICE(fmt->priv_class->category)) {
+        printf("No such device: %s\n", arg);
+        return AVERROR(EINVAL);
+    }
+
+    if ((ret = avformat_alloc_output_context2(&dev, fmt, NULL, NULL)) < 0) {
+        printf("Cannot open device: %s\n", arg);
+        goto fail;
+    }
+
+    if ((ret = avdevice_list_devices(dev, &device_list)) < 0) {
+        printf("Cannot list devices\n");
+        goto fail;
+    }
+    printf("Audo-detected sinks for %s:\n", arg);
+    for (i = 0; i < device_list->nb_devices; i++) {
+        printf("%s %s [%s]\n", device_list->default_device == i ? "*" : " ",
+               device_list->devices[i]->device_name, device_list->devices[i]->device_description);
+    }
+
+  fail:
+    avdevice_free_list_devices(&device_list);
+    avformat_close_input(&dev);
+    return ret;
+#else
+    printf("Configured without libavdevice\n");
+    return AVERROR(ENOSYS);
+#endif
+}
diff --git a/cmdutils.h b/cmdutils.h
index 76d11a5..cb34876 100644
--- a/cmdutils.h
+++ b/cmdutils.h
@@ -444,6 +444,18 @@ int show_formats(void *optctx, const char *opt, const char *arg);
 int show_devices(void *optctx, const char *opt, const char *arg);
 
 /**
+ * Print a listing containing audodetected sinks of the output device.
+ * Device name must be passed as an argument.
+ */
+int show_sinks(void *optctx, const char *opt, const char *arg);
+
+/**
+ * Print a listing containing audodetected sources of the input device.
+ * Device name must be passed as an argument.
+ */
+int show_sources(void *optctx, const char *opt, const char *arg);
+
+/**
  * Print a listing containing all the codecs supported by the
  * program.
  * This option processing function does not utilize the arguments.
diff --git a/cmdutils_common_opts.h b/cmdutils_common_opts.h
index 49b5180..758dac1 100644
--- a/cmdutils_common_opts.h
+++ b/cmdutils_common_opts.h
@@ -27,3 +27,9 @@
     { "opencl_bench", OPT_EXIT, {.func_arg = opt_opencl_bench}, "run benchmark on all OpenCL devices and show results" },
     { "opencl_options", HAS_ARG, {.func_arg = opt_opencl},      "set OpenCL environment options" },
 #endif
+#if CONFIG_AVDEVICE
+    { "sources"    , OPT_EXIT | HAS_ARG, { .func_arg = show_sources },
+      "list sources of the input device", "device" },
+    { "sinks"      , OPT_EXIT | HAS_ARG, { .func_arg = show_sinks },
+      "list sinks of the output device", "device" },
+#endif
-- 
1.9.1