audio: fix annyoing af_get_best_sample_formats() definition

The af_get_best_sample_formats() function had an argument of
int[AF_FORMAT_COUNT], which is slightly incorrect, because it's 0
terminated and should in theory have AF_FORMAT_COUNT+1 entries. It won't
actually write this many formats (since some formats are fundamentally
incompatible), but it still feels annoying and incorrect. So fix it, and
require that callers pass an AF_FORMAT_COUNT+1 array.

Note that the array size has no meaning in C function arguments (just
another issue with C static arrays being weird and stupid), so get rid
of it completely.

Not changing the af_lavcac3enc use, since that is rewritten in another
branch anyway.

audio/format.c

@@ -209,10 +209,11 @@ static int cmp_entry(const void *a, const void *b)
 // and the list is terminated with 0 (AF_FORMAT_UNKNOWN).
 // Keep in mind that this also returns formats with flipped interleaving
 // (e.g. for s16, it returns [s16, s16p, ...]).
-void af_get_best_sample_formats(int src_format, int out_formats[AF_FORMAT_COUNT])
+// out_formats must be an int[AF_FORMAT_COUNT + 1] array.
+void af_get_best_sample_formats(int src_format, int *out_formats)
 {
     int num = 0;
-    struct entry e[AF_FORMAT_COUNT];
+    struct entry e[AF_FORMAT_COUNT + 1];
     for (int fmt = 1; fmt < AF_FORMAT_COUNT; fmt++) {
         int score = af_format_conversion_score(fmt, src_format);
         if (score > INT_MIN)

audio/format.h

@@ -69,7 +69,7 @@ int af_fmt_seconds_to_bytes(int format, float seconds, int channels, int sampler
 
 void af_fill_silence(void *dst, size_t bytes, int format);
 
-void af_get_best_sample_formats(int src_format, int out_formats[AF_FORMAT_COUNT]);
+void af_get_best_sample_formats(int src_format, int *out_formats);
 int af_select_best_samplerate(int src_sampelrate, const int *available);
 
 int af_format_sample_alignment(int format);

audio/out/ao_alsa.c

@@ -704,7 +704,7 @@ static int init_device(struct ao *ao, int mode)
     dump_hw_params(ao, MSGL_DEBUG, "HW params after access:\n", alsa_hwparams);
 
     bool found_format = false;
-    int try_formats[AF_FORMAT_COUNT];
+    int try_formats[AF_FORMAT_COUNT + 1];
     af_get_best_sample_formats(ao->format, try_formats);
     for (int n = 0; try_formats[n] && !found_format; n++) {
         int mp_format = try_formats[n];

audio/out/ao_lavc.c

@@ -72,7 +72,7 @@ static bool supports_format(AVCodec *codec, int format)
 
 static void select_format(struct ao *ao, AVCodec *codec)
 {
-    int formats[AF_FORMAT_COUNT];
+    int formats[AF_FORMAT_COUNT + 1];
     af_get_best_sample_formats(ao->format, formats);
 
     for (int n = 0; formats[n]; n++) {

audio/out/ao_openal.c

@@ -197,7 +197,7 @@ static int init(struct ao *ao)
         ao->samplerate = freq;
 
     p->al_format = AL_FALSE;
-    int try_formats[AF_FORMAT_COUNT];
+    int try_formats[AF_FORMAT_COUNT + 1];
     af_get_best_sample_formats(ao->format, try_formats);
     for (int n = 0; try_formats[n]; n++) {
         p->al_format = get_al_format(try_formats[n]);

audio/out/ao_opensles.c

@@ -136,7 +136,7 @@ static int init(struct ao *ao)
     pcm.formatType = SL_DATAFORMAT_PCM;
     pcm.numChannels = 2;
 
-    int compatible_formats[AF_FORMAT_COUNT];
+    int compatible_formats[AF_FORMAT_COUNT + 1];
     af_get_best_sample_formats(ao->format, compatible_formats);
     pcm.bitsPerSample = 0;
     for (int i = 0; compatible_formats[i] && !pcm.bitsPerSample; ++i)

audio/out/ao_oss.c

@@ -315,7 +315,7 @@ static int reopen_device(struct ao *ao, bool allow_format_changes)
         }
     }
 
-    int try_formats[AF_FORMAT_COUNT];
+    int try_formats[AF_FORMAT_COUNT + 1];
     af_get_best_sample_formats(format, try_formats);
     for (int n = 0; try_formats[n]; n++) {
         format = try_formats[n];

audio/out/ao_wasapi_utils.c

@@ -97,7 +97,7 @@ static const struct wasapi_sample_fmt wasapi_formats[] = {
 static void wasapi_get_best_sample_formats(
     int src_format, struct wasapi_sample_fmt *out_formats)
 {
-    int mp_formats[AF_FORMAT_COUNT];
+    int mp_formats[AF_FORMAT_COUNT + 1];
     af_get_best_sample_formats(src_format, mp_formats);
     for (int n = 0; mp_formats[n]; n++) {
         for (int i = 0; wasapi_formats[i].mp_format; i++) {