[MPlayer-dev-eng] [PATCH] add lavfdopts cryptokey

[Reimar Döffinger]

Hello,
something similar to this is needed to allow playback of encrypted MXF
(and in the future ASF) files.
Is it okay to apply as is or does it need changes?

Greetings,
Reimar Döffinger
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diff --git a/libmpdemux/demux_lavf.c b/libmpdemux/demux_lavf.c
index 07c2301..6ec11af 100644
--- a/libmpdemux/demux_lavf.c
+++ b/libmpdemux/demux_lavf.c
@@ -49,11 +49,13 @@ extern char *audio_lang;
 static unsigned int opt_probesize = 0;
 static unsigned int opt_analyzeduration = 0;
 static char *opt_format;
+static char *opt_cryptokey;
 
 m_option_t lavfdopts_conf[] = {
 	{"probesize", &(opt_probesize), CONF_TYPE_INT, CONF_RANGE, 32, INT_MAX, NULL},
 	{"format",    &(opt_format),    CONF_TYPE_STRING,       0,  0,       0, NULL},
 	{"analyzeduration",    &(opt_analyzeduration),    CONF_TYPE_INT,       CONF_RANGE,  0,       INT_MAX, NULL},
+	{"cryptokey", &(opt_cryptokey), CONF_TYPE_STRING,       0,  0,       0, NULL},
 	{NULL, NULL, 0, 0, 0, 0, NULL}
 };
 
@@ -250,6 +252,23 @@ static int lavf_check_preferred_file(demuxer_t *demuxer){
     return 0;
 }
     
+static uint8_t char2int(char c) {
+    if (c >= '0' && c <= '9') return c - '0';
+    if (c >= 'a' && c <= 'f') return c - 'a' + 10;
+    if (c >= 'A' && c <= 'F') return c - 'A' + 10;
+    return 0;
+}
+
+static void parse_cryptokey(AVFormatContext *avfc, const char *str) {
+    int len = strlen(str) / 2;
+    uint8_t *key = av_mallocz(len);
+    int i;
+    avfc->keylen = len;
+    avfc->key = key;
+    for (i = 0; i < len; i++, str += 2)
+        *key++ = (char2int(str[0]) << 4) | char2int(str[1]);
+}
+
 static demuxer_t* demux_open_lavf(demuxer_t *demuxer){
     AVFormatContext *avfc;
     AVFormatParameters ap;
@@ -266,6 +285,8 @@ static demuxer_t* demux_open_lavf(demuxer_t *demuxer){
 
     avfc = av_alloc_format_context();
 
+    if (opt_cryptokey)
+        parse_cryptokey(avfc, opt_cryptokey);
     if (correct_pts)
         avfc->flags |= AVFMT_FLAG_GENPTS;
     if (index_mode == 0)
@@ -668,6 +689,7 @@ static void demux_close_lavf(demuxer_t *demuxer)
     if (priv){
         if(priv->avfc)
        {
+         av_freep(&priv->avfc->key);
          av_close_input_file(priv->avfc); priv->avfc= NULL;
         }
         free(priv); demuxer->priv= NULL;