* Phase 1 for DV encoding support. Muxing/demuxing of DV streams is now

     possible. For example you can do:

          ffmpeg -i i.dv -i audio_track.mp3 -map 0.0 -map 1.0 \
	         -vcodec copy -acodec pcm_s16le out.dv

   * Preparations for getting rid of DVAUDIO codec, DV stream really
     contains PCM audio, so there's no codec needed if we have a
     decent demuxer.

   * Providing entry points for dv1394 write support.

Originally committed as revision 2174 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 73 insertions, 0 deletions

diff --git a/libavformat/dvcore.h b/libavformat/dvcore.h
new file mode 100644
index 0000000000..0b8df69a91
--- /dev/null
+++ b/libavformat/dvcore.h
@@ -0,0 +1,73 @@
+/* 
+ * DV format muxer/demuxer
+ * Copyright (c) 2003 Roman Shaposhnik
+ *
+ * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
+ * of DV technical info, and SMPTE 314M specification.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <time.h>
+#include "avformat.h"
+
+/* 
+ * DVprofile is used to express the differences between various 
+ * DV flavors. For now it's primarily used for differentiating
+ * 525/60 and 625/50, but the plans are to use it for various
+ * DV specs as well (e.g. SMPTE314M vs. IEC 61834).
+ */
+typedef struct DVprofile {
+    int            dsf;                  /* value of the dsf in the DV header */
+    int            frame_size;           /* total size of one frame in bytes */
+    int            difseg_size;          /* number of DIF segments */
+    int            frame_rate;      
+    int            frame_rate_base;
+    int            ltc_divisor;          /* FPS from the LTS standpoint */
+    int            height;               /* picture height in pixels */
+    uint16_t       *video_place;         /* positions of all DV macro blocks */
+    
+    int            audio_stride;         /* size of audio_shuffle table */
+    int            audio_min_samples[3]; /* min ammount of audio samples */
+                                         /* for 48Khz, 44.1Khz and 32Khz */
+    int            audio_samples_dist[5];/* how many samples are supposed to be */
+                                         /* in each frame in a 5 frames window */
+    const uint16_t (*audio_shuffle)[9];  /* PCM shuffling table */
+} DVprofile;
+
+typedef struct DVMuxContext {
+    const DVprofile*  sys;    /* Current DV profile. E.g.: 525/60, 625/50 */
+    uint8_t     frame_buf[144000]; /* frame under contruction */
+    FifoBuffer  audio_data;   /* Fifo for storing excessive amounts of PCM */
+    int         frames;       /* Number of a current frame */
+    time_t      start_time;   /* Start time of recording */
+    uint8_t     aspect;       /* Aspect ID 0 - 4:3, 7 - 16:9 */
+    int         ast, vst;     /* Audio and Video stream indecies */
+    int         has_audio;    /* frame under contruction has audio */
+    int         has_video;    /* frame under contruction has video */
+} DVMuxContext;
+
+void dv_format_frame(DVMuxContext *, uint8_t*);
+void dv_inject_audio(DVMuxContext *, uint8_t*, uint8_t*);
+void dv_inject_video(DVMuxContext *, uint8_t*, uint8_t*);
+
+int  dv_extract_audio(uint8_t*, uint8_t*, AVCodecContext*);
+
+int  dv_audio_frame_size(const DVprofile*, int);
+
+void dv_assemble_frame(DVMuxContext *, uint8_t*, uint8_t*, int);
+int  dv_core_init(DVMuxContext *, AVStream*[]);
+void dv_core_delete(DVMuxContext *);
+
+const DVprofile* dv_frame_profile(uint8_t*);