From 9ee56da6b01ee1867ac9c40f5b2729076809f896 Mon Sep 17 00:00:00 2001
From: Jesse Talavera <jesse@jesse.tg>
Date: Wed, 18 Dec 2024 20:31:44 -0500
Subject: [PATCH] Prioritize certain backends

---
 camera/drivers/ffmpeg.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/camera/drivers/ffmpeg.c b/camera/drivers/ffmpeg.c
index 5d344047d4..b28b54cb4d 100644
--- a/camera/drivers/ffmpeg.c
+++ b/camera/drivers/ffmpeg.c
@@ -106,11 +106,21 @@ typedef struct ffmpeg_camera
 
 static void ffmpeg_camera_free(void *data);
 
-static const AVInputFormat *ffmpeg_camera_choose_format(const char *device)
+// TODO: Pick a backend based on the settings, too
+static const AVInputFormat *ffmpeg_camera_get_default_backend(void)
 {
-   // TODO: If `device` is not NULL or empty, parse it to get the backend and device name
-   // TODO: Pick the best backend for the current platform, don't just return the first
-   return av_input_video_device_next(NULL);
+   const AVInputFormat *format = NULL;
+   for (unsigned i = 0; FFMPEG_CAMERA_DEVICE_TYPE_PRIORITIES[i]; i++)
+   {
+      format = av_find_input_format(FFMPEG_CAMERA_DEVICE_TYPE_PRIORITIES[i]);
+      if (format)
+         break;
+   }
+
+   if (!format)
+      format = av_input_video_device_next(NULL);
+
+   return format;
 }
 
 // TODO: device format shall be: "<device type>/<device name>"
@@ -140,10 +150,10 @@ static void *ffmpeg_camera_init(const char *device, uint64_t caps, unsigned widt
    avdevice_register_all();
    RARCH_LOG("[FFMPEG]: Initialized libavdevice.\n");
 
-   ffmpeg->input_format = ffmpeg_camera_choose_format(device);
+   ffmpeg->input_format = ffmpeg_camera_get_default_backend();
    if (!ffmpeg->input_format)
    {
-      RARCH_ERR("[FFMPEG]: No suitable video input devices found.\n");
+      RARCH_ERR("[FFMPEG]: No suitable video input backend found.\n");
       goto error;
    }