decoder: fix pf_decode_* and pf_packetize behavior

Audio, video, and sub decoders were not drained. Indeed, pf_decode_* functions
were called with *pp_block == NULL instead of pp_block == NULL. There was no
way to distinguish a drain from an other call from the decoder loop.

There was also an issue with the packetizer. Indeed, a successful call to
pf_packetize leaded to a drain.

src/input/decoder.c

@@ -726,9 +726,10 @@ static void DecoderProcessSout( decoder_t *p_dec, block_t *p_block )
 {
     decoder_owner_sys_t *p_owner = p_dec->p_owner;
     block_t *p_sout_block;
+    block_t **pp_block = p_block ? &p_block : NULL;
 
     while( ( p_sout_block =
-                 p_dec->pf_packetize( p_dec, p_block ? &p_block : NULL ) ) )
+                 p_dec->pf_packetize( p_dec, pp_block ) ) )
     {
         if( p_owner->p_sout_input == NULL )
         {
@@ -972,11 +973,12 @@ static int DecoderQueueVideo( decoder_t *p_dec, picture_t *p_pic )
 static void DecoderDecodeVideo( decoder_t *p_dec, block_t *p_block )
 {
     picture_t      *p_pic;
+    block_t **pp_block = p_block ? &p_block : NULL;
     int i_lost = 0;
     int i_decoded = 0;
     int i_displayed = 0;
 
-    while( (p_pic = p_dec->pf_decode_video( p_dec, &p_block )) )
+    while( (p_pic = p_dec->pf_decode_video( p_dec, pp_block ) ) )
     {
         i_decoded++;
 
@@ -998,10 +1000,11 @@ static void DecoderProcessVideo( decoder_t *p_dec, block_t *p_block )
     if( p_owner->p_packetizer )
     {
         block_t *p_packetized_block;
+        block_t **pp_block = p_block ? &p_block : NULL;
         decoder_t *p_packetizer = p_owner->p_packetizer;
 
         while( (p_packetized_block =
-                p_packetizer->pf_packetize( p_packetizer, p_block ? &p_block : NULL )) )
+                p_packetizer->pf_packetize( p_packetizer, pp_block ) ) )
         {
             if( !es_format_IsSimilar( &p_dec->fmt_in, &p_packetizer->fmt_out ) )
             {
@@ -1154,11 +1157,12 @@ static int DecoderQueueAudio( decoder_t *p_dec, block_t *p_aout_buf )
 static void DecoderDecodeAudio( decoder_t *p_dec, block_t *p_block )
 {
     block_t *p_aout_buf;
+    block_t **pp_block = p_block ? &p_block : NULL;
     int i_decoded = 0;
     int i_lost = 0;
     int i_played = 0;
 
-    while( (p_aout_buf = p_dec->pf_decode_audio( p_dec, &p_block )) )
+    while( (p_aout_buf = p_dec->pf_decode_audio( p_dec, pp_block ) ) )
     {
         i_decoded++;
 
@@ -1180,10 +1184,11 @@ static void DecoderProcessAudio( decoder_t *p_dec, block_t *p_block )
     if( p_owner->p_packetizer )
     {
         block_t *p_packetized_block;
+        block_t **pp_block = p_block ? &p_block : NULL;
         decoder_t *p_packetizer = p_owner->p_packetizer;
 
         while( (p_packetized_block =
-                p_packetizer->pf_packetize( p_packetizer, p_block ? &p_block : NULL )) )
+                p_packetizer->pf_packetize( p_packetizer, pp_block ) ) )
         {
             if( !es_format_IsSimilar( &p_dec->fmt_in, &p_packetizer->fmt_out ) )
             {
@@ -1305,8 +1310,9 @@ static int DecoderQueueSpu( decoder_t *p_dec, subpicture_t *p_spu )
 static void DecoderProcessSpu( decoder_t *p_dec, block_t *p_block )
 {
     subpicture_t *p_spu;
+    block_t **pp_block = p_block ? &p_block : NULL;
 
-    while( (p_spu = p_dec->pf_decode_sub( p_dec, p_block ? &p_block : NULL ) ) )
+    while( (p_spu = p_dec->pf_decode_sub( p_dec, pp_block ) ) )
         DecoderQueueSpu( p_dec, p_spu );
 }