Adds functions to convert to/from strings and a function to iterate
over all supported device types. Also adds a new invalid type
AV_HWDEVICE_TYPE_NONE, which acts as a sentinel value.
---
libavutil/hwcontext.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
libavutil/hwcontext.h | 28 ++++++++++++++++++++++++++++
2 files changed, 74 insertions(+)
diff --git a/libavutil/hwcontext.c b/libavutil/hwcontext.c
index 252dd32e3..8195a7245 100644
--- a/libavutil/hwcontext.c
+++ b/libavutil/hwcontext.c
@@ -47,6 +47,52 @@ static const HWContextType * const hw_table[] = {
NULL,
};
+static const struct {
+ enum AVHWDeviceType type;
+ const char *name;
+} hw_type_map[] = {
+ { AV_HWDEVICE_TYPE_CUDA, "cuda" },
+ { AV_HWDEVICE_TYPE_DXVA2, "dxva2" },
+ { AV_HWDEVICE_TYPE_QSV, "qsv" },
+ { AV_HWDEVICE_TYPE_VAAPI, "vaapi" },
+ { AV_HWDEVICE_TYPE_VDPAU, "vdpau" },
+};
+
+enum AVHWDeviceType av_hwdevice_find_type_by_name(const char *name)
+{
+ int i;
+ for (i = 0; i < FF_ARRAY_ELEMS(hw_type_map); i++) {
+ if (!strcmp(hw_type_map[i].name, name))
+ return hw_type_map[i].type;
+ }
+ return AV_HWDEVICE_TYPE_NONE;
+}
+
+const char *av_hwdevice_get_type_name(enum AVHWDeviceType type)
+{
+ int i;
+ for (i = 0; i < FF_ARRAY_ELEMS(hw_type_map); i++) {
+ if (hw_type_map[i].type == type)
+ return hw_type_map[i].name;
+ }
+ return NULL;
+}
+
+enum AVHWDeviceType av_hwdevice_iterate_types(enum AVHWDeviceType prev)
+{
+ enum AVHWDeviceType next;
+ int i, set = 0;
+ for (i = 0; hw_table[i]; i++) {
+ if (prev != AV_HWDEVICE_TYPE_NONE && hw_table[i]->type <= prev)
+ continue;
+ if (!set || hw_table[i]->type < next) {
+ next = hw_table[i]->type;
+ set = 1;
+ }
+ }
+ return set ? next : AV_HWDEVICE_TYPE_NONE;
+}
+
static const AVClass hwdevice_ctx_class = {
.class_name = "AVHWDeviceContext",
.item_name = av_default_item_name,
diff --git a/libavutil/hwcontext.h b/libavutil/hwcontext.h
index 49c7a21c1..cce7cdc7e 100644
--- a/libavutil/hwcontext.h
+++ b/libavutil/hwcontext.h
@@ -30,6 +30,8 @@ enum AVHWDeviceType {
AV_HWDEVICE_TYPE_VAAPI,
AV_HWDEVICE_TYPE_DXVA2,
AV_HWDEVICE_TYPE_QSV,
+
+ AV_HWDEVICE_TYPE_NONE
};
typedef struct AVHWDeviceInternal AVHWDeviceInternal;
@@ -223,6 +225,32 @@ typedef struct AVHWFramesContext {
} AVHWFramesContext;
/**
+ * Look up an AVHWDeviceType by name.
+ *
+ * @param name String name of the device type (case-insensitive).
+ * @return The type from enum AVHWDeviceType, or AV_HWDEVICE_TYPE_NONE if
+ * not found.
+ */
+enum AVHWDeviceType av_hwdevice_find_type_by_name(const char *name);
+
+/** Get the string name of an AVHWDeviceType.
+ *
+ * @param type Type from enum AVHWDeviceType.
+ * @return Pointer to a static string containing the name, or NULL if the type
+ * is not valid.
+ */
+const char *av_hwdevice_get_type_name(enum AVHWDeviceType type);
+
+/**
+ * Iterate over supported device types.
+ *
+ * @param type AV_HWDEVICE_TYPE_NONE initially, then the previous type
+ * returned by this function in subsequent iterations.
+ * @return The next usable device type from enum AVHWDeviceType.
+ */
+enum AVHWDeviceType av_hwdevice_iterate_types(enum AVHWDeviceType prev);
+
+/**
* Allocate an AVHWDeviceContext for a given pixel format.
*
* @return a reference to the newly created AVHWDeviceContext on success or
NULL
--
2.11.0
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