[FFmpeg-devel] [PATCH] avutil/log: Replace addresses in log output with simple ids

[softworkz]

From: softworkz <softworkz at hotmail.com>

..and individual numbering. The benefits are:

- Smaller log file sizes
- The disambiguation is much easier to recognize and to follow
- It eventually allows comparing and viewing log file diffs
  without almost every line being different due to those addresses

Signed-off-by: softworkz <softworkz at hotmail.com>
---
    avutil/log: Replace addresses in log output with simple ids
    
    ..and individual numbering. The benefits are:
    
     * Smaller log file sizes
     * The disambiguation is much easier to recognize and to follow
     * It eventually allows comparing and viewing log file diffs without
       almost every line being different due to those addresses
    
    
    Before
    ======
    
    [hevc @ 0000018e72a89cc0] nal_unit_type: 34(PPS), nuh_layer_id: 0,
    tempora.. [hevc @ 0000018e72a89cc0] Decoding PPS [hevc @
    0000018e72a89cc0] nal_unit_type: 39(SEI_PREFIX), nuh_layer_id: 0, [hevc
    @ 0000018e72a89cc0] Decoding SEI [mov,mp4,m4a,3gp,3g2,mj2 @
    0000018e72a8e240] All info found [mov,mp4,m4a,3gp,3g2,mj2 @
    0000018e72a8e240] After avformat_find_stream_in.. [hevc @
    0000018e742f6b40] Decoded frame with POC 2. detected 16 logical cores
    [Parsed_scale_0 @ 0000018e74382f40] Setting 'w' to value '320'
    [Parsed_scale_0 @ 0000018e74382f40] Setting 'h' to value '180'
    [Parsed_scale_1 @ 0000018e74382440] Setting 'w' to value '320' [mjpeg @
    0000018e743210c0] Forcing thread count to 1 for MJPEG encoding, u..
    [mjpeg @ 0000018e743210c0] intra_quant_bias = 96 inter_quant_bias = 0
    
    
    After
    =====
    
    [hevc #0] nal_unit_type: 34(PPS), nuh_layer_id: 0, temporal_id: 0 [hevc
    #0] Decoding PPS [hevc #0] nal_unit_type: 39(SEI_PREFIX), nuh_layer_id:
    0, temporal_id: 0 [hevc #0] Decoding SEI [mov,mp4,m4a,3gp,3g2,mj2 #0]
    All info found [mov,mp4,m4a,3gp,3g2,mj2 #0] After
    avformat_find_stream_info() pos: 310096.. [hevc #1] Decoded frame with
    POC 2. [Parsed_scale_0 #0] Setting 'w' to value '320' [Parsed_scale_0
    #0] Setting 'h' to value '180' [Parsed_scale_2 #2] w:320 h:180
    fmt:yuv420p10le sar:0/1 -> w:320 h:180 fmt.. [mjpeg #2] Forcing thread
    count to 1 for MJPEG encoding, use -thread_type [mjpeg #2]
    intra_quant_bias = 96 inter_quant_bias = 0

Published-As: https://github.com/ffstaging/FFmpeg/releases/tag/pr-ffstaging-59%2Fsoftworkz%2Fsubmit_logaddresses-v1
Fetch-It-Via: git fetch https://github.com/ffstaging/FFmpeg pr-ffstaging-59/softworkz/submit_logaddresses-v1
Pull-Request: https://github.com/ffstaging/FFmpeg/pull/59

 libavutil/log.c | 57 +++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 53 insertions(+), 4 deletions(-)

diff --git a/libavutil/log.c b/libavutil/log.c
index c5ee876a88..50c8c41ef8 100644
--- a/libavutil/log.c
+++ b/libavutil/log.c
@@ -57,6 +57,55 @@ static AVMutex mutex = AV_MUTEX_INITIALIZER;
 
 static int av_log_level = AV_LOG_INFO;
 static int flags;
+static int nb_class_ids;
+
+#define NB_CLASS_IDS 1000
+static struct class_ids {
+    void *avcl;
+    uint64_t class_hash;
+    unsigned id;
+} class_ids[NB_CLASS_IDS];
+
+static uint64_t fnv_hash(const char *str)
+{
+    // FNV-1a 64-bit hash algorithm
+    uint64_t hash = 0xcbf29ce484222325ULL;
+    while (*str) {
+        hash ^= (unsigned char)*str++;
+        hash *= 0x100000001b3ULL;
+    }
+    return hash;
+}
+
+static unsigned get_class_id(void* avcl)
+{
+    AVClass* avc = avcl ? *(AVClass **) avcl : NULL;
+    const char* class_name = avc->item_name(avcl);
+    unsigned i, nb_ids = 0;
+    uint64_t class_hash;
+
+    for (i = 0; i < NB_CLASS_IDS && class_ids[i].avcl; i++) {
+        if (class_ids[i].avcl == avcl)
+            return class_ids[i].id;
+    }
+
+    class_hash = fnv_hash(avc->class_name);
+
+    for (i = 0; i < NB_CLASS_IDS; i++) {
+        if (class_ids[i].class_hash == class_hash)
+            nb_ids++;
+
+        if (!class_ids[i].avcl) {
+            class_ids[i].avcl = avcl;
+            class_ids[i].class_hash = class_hash;
+            class_ids[i].id = nb_ids;
+            return class_ids[i].id;
+        }
+    }
+
+    // exceeded NB_CLASS_IDS entries in class_ids[]
+    return 0;
+}
 
 #define NB_LEVELS 8
 #if defined(_WIN32) && HAVE_SETCONSOLETEXTATTRIBUTE && HAVE_GETSTDHANDLE
@@ -331,13 +380,13 @@ static void format_line(void *avcl, int level, const char *fmt, va_list vl,
             AVClass** parent = *(AVClass ***) (((uint8_t *) avcl) +
                                    avc->parent_log_context_offset);
             if (parent && *parent) {
-                av_bprintf(part+0, "[%s @ %p] ",
-                           item_name(parent, *parent), parent);
+                av_bprintf(part+0, "[%s #%u] ",
+                           item_name(parent, *parent), get_class_id(parent));
                 if(type) type[0] = get_category(parent);
             }
         }
-        av_bprintf(part+1, "[%s @ %p] ",
-                   item_name(avcl, avc), avcl);
+        av_bprintf(part+1, "[%s #%u] ",
+                   item_name(avcl, avc), get_class_id(avcl));
         if(type) type[1] = get_category(avcl);
     }
 

base-commit: 5c5be37daff4f4ecbe0c20d6a9f0fdad6eadc9c8
-- 
ffmpeg-codebot