* Restructuring the division of labor between DV codec and DV format

    [ Based on a patch by Brian Brice (bbrice at newtek dot com) ]

Originally committed as revision 6161 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 57 insertions, 0 deletions

diff --git a/libavcodec/dvdata.h b/libavcodec/dvdata.h
index a3d42d66c1..87d34c0430 100644
--- a/libavcodec/dvdata.h
+++ b/libavcodec/dvdata.h
@@ -2624,6 +2624,29 @@ static const DVprofile dv_profiles[] = {
     }
 };
 
+enum dv_section_type {
+     dv_sect_header  = 0x1f,
+     dv_sect_subcode = 0x3f,
+     dv_sect_vaux    = 0x56,
+     dv_sect_audio   = 0x76,
+     dv_sect_video   = 0x96,
+};
+
+enum dv_pack_type {
+     dv_header525     = 0x3f, /* see dv_write_pack for important details on */
+     dv_header625     = 0xbf, /* these two packs */
+     dv_timecode      = 0x13,
+     dv_audio_source  = 0x50,
+     dv_audio_control = 0x51,
+     dv_audio_recdate = 0x52,
+     dv_audio_rectime = 0x53,
+     dv_video_source  = 0x60,
+     dv_video_control = 0x61,
+     dv_video_recdate = 0x62,
+     dv_video_rectime = 0x63,
+     dv_unknown_pack  = 0xff,
+};
+
 /* minimum number of bytes to read from a DV stream in order to determine the profile */
 #define DV_PROFILE_BYTES (6*80) /* 6 DIF blocks */
 
@@ -2663,3 +2686,37 @@ static inline const DVprofile* dv_codec_profile(AVCodecContext* codec)
 
     return NULL;
 }
+
+static inline int dv_write_dif_id(enum dv_section_type t, uint8_t chan_num, uint8_t seq_num,
+                                  uint8_t dif_num, uint8_t* buf)
+{
+    buf[0] = (uint8_t)t;    /* Section type */
+    buf[1] = (seq_num<<4) | /* DIF seq number 0-9 for 525/60; 0-11 for 625/50 */
+             (chan_num << 3) | /* FSC: for 50Mb/s 0 - first channel; 1 - second */
+             7;             /* reserved -- always 1 */
+    buf[2] = dif_num;       /* DIF block number Video: 0-134, Audio: 0-8 */
+    return 3;
+}
+
+
+static inline int dv_write_ssyb_id(uint8_t syb_num, uint8_t fr, uint8_t* buf)
+{
+    if (syb_num == 0 || syb_num == 6) {
+        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
+                 (0<<4)  | /* AP3 (Subcode application ID) */
+                 0x0f;     /* reserved -- always 1 */
+    }
+    else if (syb_num == 11) {
+        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
+                 0x7f;     /* reserved -- always 1 */
+    }
+    else {
+        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
+                 (0<<4)  | /* APT (Track application ID) */
+                 0x0f;     /* reserved -- always 1 */
+    }
+    buf[1] = 0xf0 |            /* reserved -- always 1 */
+             (syb_num & 0x0f); /* SSYB number 0 - 11   */
+    buf[2] = 0xff;             /* reserved -- always 1 */
+    return 3;
+}