[vlc-commits] packetizer: dts: add LBR header parser

[Francois Cartegnie]

vlc | branch: master | Francois Cartegnie <fcvlcdev at free.fr> | Mon Mar 11 18:28:22 2019 +0100| [60cca0eadead0682e6625f825f6c7294999a49ee] | committer: Francois Cartegnie

packetizer: dts: add LBR header parser

> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=60cca0eadead0682e6625f825f6c7294999a49ee
---

 modules/packetizer/dts_header.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/modules/packetizer/dts_header.c b/modules/packetizer/dts_header.c
index b06934326c..1d4ebd98a1 100644
--- a/modules/packetizer/dts_header.c
+++ b/modules/packetizer/dts_header.c
@@ -259,6 +259,44 @@ static int dts_header_ParseSubstream( vlc_dts_header_t *p_header,
     return VLC_SUCCESS;
 }
 
+static int dts_header_ParseLBRExtSubstream( vlc_dts_header_t *p_header,
+                                             const void *p_buffer )
+{
+    bs_t s;
+    bs_init( &s, p_buffer, VLC_DTS_HEADER_SIZE );
+    bs_skip( &s, 32 /*SYNCEXTSSH*/ );
+    uint8_t ucFmtInfoCode = bs_read( &s, 8 );
+    if( ucFmtInfoCode != 0x02 /*LBR_HDRCODE_DECODERINIT*/ )
+        return VLC_EGENERIC;
+    p_header->i_rate = bs_read( &s, 8 );
+    /* See ETSI TS 102 114, table 9-3 */
+    const unsigned int LBRsamplerates[] = {
+        8000, 16000, 32000,
+        0, 0,
+        22050, 44100,
+        0, 0, 0,
+        12000, 24000, 48000,
+    };
+    if(p_header->i_rate >= ARRAY_SIZE(LBRsamplerates))
+        return VLC_EGENERIC;
+    p_header->i_rate = LBRsamplerates[p_header->i_rate];
+    if( p_header->i_rate < 16000 )
+        p_header->i_frame_length = 1024;
+    else if( p_header->i_rate < 32000 )
+        p_header->i_frame_length = 2048;
+    else
+        p_header->i_frame_length = 4096;
+
+    uint16_t i_spkrmask = bs_read( &s, 16 );
+    bs_skip( &s, 16 );
+    bs_skip( &s, 8 );
+    bs_skip( &s, 8 );
+    bs_skip( &s, 16 );
+    bs_skip( &s, 16 );
+
+    return VLC_SUCCESS;
+}
+
 static int dts_header_ParseCore( vlc_dts_header_t *p_header,
                                  const void *p_buffer)
 {