decoder: Give packetizer aspect ratio to decoder.

When the packetizer detects a valid pixel aspect ratio this should be
forwarded to the decoders input format. This is helpful for decoder modules
which do not expose the aspect ratio on their own.
Signed-off-by: Martin Storsjö <martin@martin.st>

src/input/decoder.c

@@ -1569,6 +1569,21 @@ static void DecoderProcessVideo( decoder_t *p_dec, block_t *p_block, bool b_flus
                 es_format_Clean( &p_dec->fmt_in );
                 es_format_Copy( &p_dec->fmt_in, &p_packetizer->fmt_out );
             }
+
+            /* If the packetizer provides aspect ratio information, pass it
+             * to the decoder as a hint if the decoder itself can't provide
+             * it. Copy it regardless of the current value of the decoder input
+             * format aspect ratio, to properly propagate changes in aspect
+             * ratio. */
+            if( p_packetizer->fmt_out.video.i_sar_num > 0 &&
+                    p_packetizer->fmt_out.video.i_sar_den > 0)
+            {
+                p_dec->fmt_in.video.i_sar_num =
+                    p_packetizer->fmt_out.video.i_sar_num;
+                p_dec->fmt_in.video.i_sar_den=
+                    p_packetizer->fmt_out.video.i_sar_den;
+            }
+
             if( p_packetizer->pf_get_cc )
                 DecoderGetCc( p_dec, p_packetizer );