VideoToolbox: add 4K support for Twister SoCs

Also add a couple of missing warnings

modules/codec/videotoolbox.m

@@ -44,6 +44,12 @@
 
 #if TARGET_OS_IPHONE
 #import <UIKit/UIKit.h>
+
+/* support iOS SDKs < v9.1 */
+#ifndef CPUFAMILY_ARM_TWISTER
+#define CPUFAMILY_ARM_TWISTER 0x92fb37c8
+#endif
+
 #endif
 
 #pragma mark - module descriptor
@@ -89,6 +95,7 @@ void VTDictionarySetInt32(CFMutableDictionaryRef, CFStringRef, int);
 static void copy420YpCbCr8Planar(picture_t *, CVPixelBufferRef buffer,
                                  unsigned i_width, unsigned i_height);
 static BOOL deviceSupportsAdvancedProfiles();
+static BOOL deviceSupportsAdvancedLevels();
 
 struct picture_sys_t {
     CFTypeRef pixelBuffer;
@@ -158,12 +165,19 @@ static CMVideoCodecType CodecPrecheck(decoder_t *p_dec)
 #if !TARGET_OS_IPHONE
             /* a level higher than 5.2 was not tested, so don't dare to
              * try to decode it*/
-            if (i_level > 52)
+            if (i_level > 52) {
+                msg_Dbg(p_dec, "unsupported H264 level %zu", i_level);
                 return -1;
+            }
 #else
             /* on SoC A8, 4.2 is the highest specified profile */
-            if (i_level > 42)
+            if (i_level > 42) {
+                /* on Twister, we can do up to 5.2 */
+                if (!deviceSupportsAdvancedLevels() || i_level > 52) {
+                    msg_Dbg(p_dec, "unsupported H264 level %zu", i_level);
                     return -1;
+                }
+            }
 #endif
 
             break;
@@ -322,6 +336,7 @@ static int StartVideoToolbox(decoder_t *p_dec, block_t *p_block)
 
         if (i_ret != VLC_SUCCESS) {
             free(p_alloc_buf);
+            msg_Warn(p_dec, "extra buffer allocation failed");
             return VLC_EGENERIC;
         }
 
@@ -329,6 +344,7 @@ static int StartVideoToolbox(decoder_t *p_dec, block_t *p_block)
         size_t i_sps_size = 0, i_pps_size = 0;
         if (!p_buf) {
             free(p_alloc_buf);
+            msg_Warn(p_dec, "extra buffer allocation failed");
             return VLC_EGENERIC;
         }
 
@@ -341,7 +357,7 @@ static int StartVideoToolbox(decoder_t *p_dec, block_t *p_block)
                                 &p_pps_buf,
                                 &i_pps_size);
         if (i_ret != VLC_SUCCESS) {
-            msg_Warn(p_dec, "sps pps parsing failed");
+            msg_Warn(p_dec, "sps pps detection failed");
             free(p_alloc_buf);
             return VLC_EGENERIC;
         }
@@ -353,6 +369,7 @@ static int StartVideoToolbox(decoder_t *p_dec, block_t *p_block)
 
         if (i_ret != VLC_SUCCESS) {
             free(p_alloc_buf);
+            msg_Warn(p_dec, "sps pps parsing failed");
             return VLC_EGENERIC;
         }
         /* this data is more trust-worthy than what we receive
@@ -373,8 +390,10 @@ static int StartVideoToolbox(decoder_t *p_dec, block_t *p_block)
                                 &sps_data, p_sps_buf, i_sps_size,
                                 p_pps_buf, i_pps_size);
         free(p_alloc_buf);
-        if (!p_block)
+        if (!p_block) {
+            msg_Warn(p_dec, "buffer creation failed");
             return VLC_EGENERIC;
+        }
 
         extradata = CFDataCreate(kCFAllocatorDefault,
                                  p_block->p_buffer,
@@ -585,8 +604,10 @@ static int StartVideoToolbox(decoder_t *p_dec, block_t *p_block)
     /* setup storage */
     p_sys->outputTimeStamps = [[NSMutableArray alloc] init];
     p_sys->outputFrames = [[NSMutableDictionary alloc] init];
-    if (!p_sys->outputFrames)
+    if (!p_sys->outputFrames) {
+        msg_Warn(p_dec, "buffer management structure allocation failed");
         return VLC_ENOMEM;
+    }
 
     p_sys->b_started = YES;
 
@@ -638,8 +659,9 @@ static int OpenDecoder(vlc_object_t *p_this)
     /* check quickly if we can digest the offered data */
     CMVideoCodecType codec;
     codec = CodecPrecheck(p_dec);
-    if (codec == -1)
+    if (codec == -1) {
         return VLC_EGENERIC;
+    }
 
     /* now that we see a chance to decode anything, allocate the
      * internals and start the decoding session */
@@ -715,6 +737,30 @@ static BOOL deviceSupportsAdvancedProfiles()
 #endif
 }
 
+static BOOL deviceSupportsAdvancedLevels()
+{
+#if TARGET_IPHONE_SIMULATOR
+    return YES;
+#endif
+#if TARGET_OS_IPHONE
+    size_t size;
+    int32_t cpufamily;
+
+    size = sizeof(cpufamily);
+    sysctlbyname("hw.cpufamily", &cpufamily, &size, NULL, 0);
+
+    /* Proper 4K decoding requires a Twister SoC
+     * Everything below will kill the decoder daemon */
+    if (cpufamily == CPUFAMILY_ARM_TWISTER) {
+        return YES;
+    }
+
+    return NO;
+#else
+    return YES;
+#endif
+}
+
 static inline void bo_add_mp4_tag_descr(bo_t *p_bo, uint8_t tag, uint32_t size)
 {
     bo_add_8(p_bo, tag);