From ddadc36097da1ecd2c68a55ca5b6c65b387be3da Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Mon, 4 May 2015 19:13:50 +0200
Subject: Autodetect VLC version

---
 src/VLCInput.cpp | 102 ++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 98 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/VLCInput.cpp b/src/VLCInput.cpp
index 5115c53..70381fb 100644
--- a/src/VLCInput.cpp
+++ b/src/VLCInput.cpp
@@ -18,6 +18,7 @@
 
 #include <cstdio>
 #include <string>
+#include <cstring>
 #include <chrono>
 
 #include "VLCInput.h"
@@ -28,11 +29,12 @@
 
 #include <sys/time.h>
 
+int check_vlc_uses_size_t();
 
 using namespace std;
 
 // VLC Audio prerender callback
-void prepareRender(
+void prepareRender_size_t(
         void* p_audio_data,
         uint8_t** pp_pcm_buffer,
         size_t size)
@@ -42,9 +44,19 @@ void prepareRender(
     in->preRender_cb(pp_pcm_buffer, size);
 }
 
+void prepareRender(
+        void* p_audio_data,
+        uint8_t** pp_pcm_buffer,
+        unsigned int size)
+{
+    VLCInput* in = (VLCInput*)p_audio_data;
+
+    in->preRender_cb(pp_pcm_buffer, size);
+}
+
 
 // Audio postrender callback
-void handleStream(
+void handleStream_size_t(
         void* p_audio_data,
         uint8_t* p_pcm_buffer,
         unsigned int channels,
@@ -66,6 +78,28 @@ void handleStream(
     in->postRender_cb();
 }
 
+// convert from unsigned int size to size_t size
+void handleStream(
+        void* p_audio_data,
+        uint8_t* p_pcm_buffer,
+        unsigned int channels,
+        unsigned int rate,
+        unsigned int nb_samples,
+        unsigned int bits_per_sample,
+        unsigned int size,
+        int64_t pts)
+{
+    handleStream_size_t(
+        p_audio_data,
+        p_pcm_buffer,
+        channels,
+        rate,
+        nb_samples,
+        bits_per_sample,
+        size,
+        pts);
+}
+
 // VLC Exit callback
 void handleVLCExit(void* opaque)
 {
@@ -77,6 +111,29 @@ int VLCInput::prepare()
     int err;
     fprintf(stderr, "Initialising VLC...\n");
 
+    long long int handleStream_address;
+    long long int prepareRender_address;
+
+    int vlc_version_check = check_vlc_uses_size_t();
+    if (vlc_version_check == 0) {
+        fprintf(stderr, "You are using VLC with unsigned int size callbacks\n");
+
+        handleStream_address = (long long int)(intptr_t)(void*)&handleStream;
+        prepareRender_address = (long long int)(intptr_t)(void*)&prepareRender;
+    }
+    else if (vlc_version_check == 1) {
+        fprintf(stderr, "You are using VLC with size_t size callbacks\n");
+
+        handleStream_address = (long long int)(intptr_t)(void*)&handleStream_size_t;
+        prepareRender_address = (long long int)(intptr_t)(void*)&prepareRender_size_t;
+    }
+    else {
+        fprintf(stderr, "Error detecting VLC version!\n");
+        fprintf(stderr, "      you are using %s\n", libvlc_get_version());
+        return -1;
+    }
+
+
     // VLC options
     char smem_options[512];
     snprintf(smem_options, sizeof(smem_options),
@@ -89,8 +146,8 @@ int VLCInput::prepare()
                 "audio-data=%lld"
             "}",
             m_rate,
-            (long long int)(intptr_t)(void*)&handleStream,
-            (long long int)(intptr_t)(void*)&prepareRender,
+            handleStream_address,
+            prepareRender_address,
             (long long int)(intptr_t)this);
 
     char verb_options[512];
@@ -244,5 +301,42 @@ void VLCInput::write_icy_text(const std::string& filename) const
     fclose(fd);
 }
 
+/* VLC up to version 2.1.0 used a different callback function signature.
+ * VLC 2.2.0 uses size_t
+ *
+ * \return 1 if the callback with size_t size should be used.
+ *         0 if the callback with unsigned int size should be used.
+ *        -1 if there was an error.
+ */
+int check_vlc_uses_size_t()
+{
+    int retval = -1;
+
+    char libvlc_version[256];
+    strncpy(libvlc_version, libvlc_get_version(), 256);
+
+    char *space_position = strstr(libvlc_version, " ");
+
+    if (space_position) {
+        *space_position = '\0';
+    }
+
+    char *saveptr;
+    char *major_ver_sz = strtok_r(libvlc_version, ".", &saveptr);
+    if (major_ver_sz) {
+        int major_ver = atoi(major_ver_sz);
+
+        char *minor_ver_sz = strtok_r(NULL, ".", &saveptr);
+        if (minor_ver_sz) {
+            int minor_ver = atoi(minor_ver_sz);
+
+            retval = (major_ver >= 2 && minor_ver >= 2) ? 1 : 0;
+        }
+    }
+
+    return retval;
+}
+
+
 #endif // HAVE_VLC
 
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