1. ffmpeg
  2. Commit 118e91f3d841435c50df4e110eb108d720cdcecf
Browse code

* 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

Roman Shaposhnik authored on 2003/08/29 04:53:47
Showing 4 changed files
libavformat/Makefile
History View file @ 118e91f
... ... 
@@ -13,7 +13,7 @@ PPOBJS=
13 13
14 14 
 # mux and demuxes
15 15 
 OBJS+=mpeg.o mpegts.o mpegtsenc.o ffm.o crc.o img.o raw.o rm.o \
16 
-      avienc.o avidec.o wav.o swf.o au.o gif.o mov.o mpjpeg.o dv.o \
16 
+      avienc.o avidec.o wav.o swf.o au.o gif.o mov.o mpjpeg.o dvcore.o dv.o \
17 17 
       yuv4mpeg.o 4xm.o flvenc.o flvdec.o movenc.o
18 18
19 19 
 ifeq ($(CONFIG_RISKY),yes)
libavformat/dv.c
History View file @ 118e91f
... ... 
@@ -17,13 +17,11 @@
17 17 
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18 18 
  */
19 19 
 #include "avformat.h"
20 
-
21 
-#define NTSC_FRAME_SIZE 120000
22 
-#define PAL_FRAME_SIZE  144000
20 
+#include "dvcore.h"
23 21
24 22 
 typedef struct DVDemuxContext {
25 23 
     int       is_audio;
26 
-    uint8_t   buf[PAL_FRAME_SIZE];
24 
+    uint8_t   buf[144000];
27 25 
     int       size;
28 26 
 } DVDemuxContext;
29 27
... ... 
@@ -39,7 +37,7 @@ static int dv_read_header(AVFormatContext *s,
39 39 
         return AVERROR_NOMEM;
40 40 
     vst->codec.codec_type = CODEC_TYPE_VIDEO;
41 41 
     vst->codec.codec_id = CODEC_ID_DVVIDEO;
42 
-
42 
+    vst->codec.bit_rate = 25000000;
43 43
44 44 
     ast = av_new_stream(s, 1);
45 45 
     if (!ast)
... ... 
@@ -60,18 +58,14 @@ static void __destruct_pkt(struct AVPacket *pkt)
60 60
61 61 
 static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
62 62 
 {
63 
-    int ret, dsf;
63 
+    int ret;
64 64 
     DVDemuxContext *c = s->priv_data;
65 65
66 66 
     if (!c->is_audio) {
67 67 
         ret = get_buffer(&s->pb, c->buf, 4);
68 68 
         if (ret <= 0)
69 69 
             return -EIO;
70 
-        dsf = c->buf[3] & 0x80;
71 
-        if (!dsf)
72 
-            c->size = NTSC_FRAME_SIZE;
73 
-        else
74 
-            c->size = PAL_FRAME_SIZE;
70 
+	c->size = dv_frame_profile(&c->buf[0])->frame_size;
75 71
76 72 
 	ret = get_buffer(&s->pb, c->buf + 4, c->size - 4);
77 73 
 	if (ret <= 0)
... ... 
@@ -94,20 +88,16 @@ static int dv_read_close(AVFormatContext *s)
94 94 
     return 0;
95 95 
 }
96 96
97 
-static AVInputFormat dv_iformat = {
98 
-    "dv",
99 
-    "DV video format",
100 
-    sizeof(DVDemuxContext),
101 
-    NULL,
102 
-    dv_read_header,
103 
-    dv_read_packet,
104 
-    dv_read_close,
105 
-    .extensions = "dv",
106 
-};
107 
-
108 
-
109 97 
 int dv_write_header(struct AVFormatContext *s)
110 98 
 {
99 
+    DVMuxContext *c = s->priv_data;
100 
+
101 
+    if (s->nb_streams != 2 || dv_core_init(c, s->streams) != 0) {
102 
+        fprintf(stderr, "Can't initialize DV format!\n"
103 
+		    "Make sure that you supply exactly two streams:\n"
104 
+		    "     video: 25fps or 29.97fps, audio: 2ch/48Khz/PCM\n");
105 
+	return -1;
106 
+    }
111 107 
     return 0;
112 108 
 }
113 109
... ... 
@@ -115,24 +105,52 @@ int dv_write_packet(struct AVFormatContext *s,
115 115 
                      int stream_index,
116 116 
                      unsigned char *buf, int size, int force_pts)
117 117 
 {
118 
-    put_buffer(&s->pb, buf, size);
119 
-    put_flush_packet(&s->pb);
118 
+    DVMuxContext *c = s->priv_data;
119 
+
120 
+    if (stream_index == c->vst)
121 
+        dv_assemble_frame(c, buf, NULL, 0);
122 
+    else
123 
+        dv_assemble_frame(c, NULL, buf, size);
124 
+
125 
+    if (c->has_audio && c->has_video) {
126 
+        put_buffer(&s->pb, &c->frame_buf[0], c->sys->frame_size);
127 
+        put_flush_packet(&s->pb);
128 
+    }
129 
+
120 130 
     return 0;
121 131 
 }
122 132
133 
+/*
134 
+ * We might end up with some extra A/V data without matching counterpart.
135 
+ * E.g. video data without enough audio to write the complete frame.
136 
+ * Currently we simply drop the last frame. I don't know whether this
137 
+ * is the best strategy of all
138 
+ */
123 139 
 int dv_write_trailer(struct AVFormatContext *s)
124 140 
 {
141 
+    dv_core_delete((DVMuxContext *)s->priv_data);
125 142 
     return 0;
126 143 
 }
127 144
145 
+static AVInputFormat dv_iformat = {
146 
+    "dv",
147 
+    "DV video format",
148 
+    sizeof(DVDemuxContext),
149 
+    NULL,
150 
+    dv_read_header,
151 
+    dv_read_packet,
152 
+    dv_read_close,
153 
+    .extensions = "dv",
154 
+};
155 
+
128 156 
 AVOutputFormat dv_oformat = {
129 157 
     "dv",
130 158 
     "DV video format",
131 159 
     NULL,
132 160 
     "dv",
133 
-    0,
161 
+    sizeof(DVMuxContext),
162 
+    CODEC_ID_PCM_S16LE,
134 163 
     CODEC_ID_DVVIDEO,
135 
-    CODEC_ID_DVAUDIO,
136 164 
     dv_write_header,
137 165 
     dv_write_packet,
138 166 
     dv_write_trailer,
libavformat/dvcore.c
History View file @ 118e91f
139 167 
new file mode 100644
... ... 
@@ -0,0 +1,668 @@
0 
+/*
1 
+ * DV format muxer/demuxer
2 
+ * Copyright (c) 2003 Roman Shaposhnik
3 
+ *
4 
+ * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
5 
+ * of DV technical info, and SMPTE 314M specification.
6 
+ *
7 
+ * This library is free software; you can redistribute it and/or
8 
+ * modify it under the terms of the GNU Lesser General Public
9 
+ * License as published by the Free Software Foundation; either
10 
+ * version 2 of the License, or (at your option) any later version.
11 
+ *
12 
+ * This library is distributed in the hope that it will be useful,
13 
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 
+ * Lesser General Public License for more details.
16 
+ *
17 
+ * You should have received a copy of the GNU Lesser General Public
18 
+ * License along with this library; if not, write to the Free Software
19 
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20 
+ */
21 
+#include "avformat.h"
22 
+#include "dvcore.h"
23 
+
24 
+/*
25 
+ * The reason why the following three big ugly looking tables are
26 
+ * here is my lack of DV spec IEC 61834. The tables were basically
27 
+ * constructed to make code that places packs in SSYB, VAUX and
28 
+ * AAUX blocks very simple and table-driven. They conform to the
29 
+ * SMPTE 314M and the output of my personal DV camcorder, neither
30 
+ * of which is sufficient for a reliable DV stream producing. Thus
31 
+ * while code is still in development I'll be gathering input from
32 
+ * people with different DV equipment and modifying the tables to
33 
+ * accommodate all the quirks. Later on, if possible, some of them
34 
+ * will be folded into smaller tables and/or switch-if logic. For
35 
+ * now, my only excuse is -- they don't eat up that much of a space.
36 
+ */
37 
+
38 
+static const int dv_ssyb_packs_dist[12][6] = {
39 
+    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
40 
+    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
41 
+    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
42 
+    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
43 
+    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
44 
+    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
45 
+    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
46 
+    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
47 
+    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
48 
+    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
49 
+    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
50 
+    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
51 
+};
52 
+
53 
+static const int dv_vaux_packs_dist[12][15] = {
54 
+    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
55 
+      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
56 
+    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
57 
+      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
58 
+    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
59 
+      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
60 
+    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
61 
+      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
62 
+    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
63 
+      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
64 
+    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
65 
+      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
66 
+    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
67 
+      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
68 
+    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
69 
+      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
70 
+    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
71 
+      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
72 
+    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
73 
+      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
74 
+    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
75 
+      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
76 
+    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
77 
+      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
78 
+};
79 
+
80 
+static const int dv_aaux_packs_dist[12][9] = {
81 
+    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
82 
+    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
83 
+    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
84 
+    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
85 
+    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
86 
+    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
87 
+    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
88 
+    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
89 
+    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
90 
+    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
91 
+    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
92 
+    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
93 
+};
94 
+
95 
+enum dv_section_type {
96 
+     dv_sect_header  = 0x1f,
97 
+     dv_sect_subcode = 0x3f,
98 
+     dv_sect_vaux    = 0x56,
99 
+     dv_sect_audio   = 0x76,
100 
+     dv_sect_video   = 0x96,
101 
+};
102 
+
103 
+enum dv_pack_type {
104 
+     dv_header525     = 0x3f, /* see dv_write_pack for important details on */
105 
+     dv_header625     = 0xbf, /* these two packs */
106 
+     dv_timecode      = 0x13,
107 
+     dv_audio_source  = 0x50,
108 
+     dv_audio_control = 0x51,
109 
+     dv_audio_recdate = 0x52,
110 
+     dv_audio_rectime = 0x53,
111 
+     dv_video_source  = 0x60,
112 
+     dv_video_control = 0x61,
113 
+     dv_viedo_recdate = 0x62,
114 
+     dv_video_rectime = 0x63,
115 
+     dv_unknown_pack  = 0xff,
116 
+};
117 
+
118 
+static const uint16_t dv_audio_shuffle525[10][9] = {
119 
+  {  0, 30, 60, 20, 50, 80, 10, 40, 70 }, /* 1st channel */
120 
+  {  6, 36, 66, 26, 56, 86, 16, 46, 76 },
121 
+  { 12, 42, 72,  2, 32, 62, 22, 52, 82 },
122 
+  { 18, 48, 78,  8, 38, 68, 28, 58, 88 },
123 
+  { 24, 54, 84, 14, 44, 74,  4, 34, 64 },
124 
+
125 
+  {  1, 31, 61, 21, 51, 81, 11, 41, 71 }, /* 2nd channel */
126 
+  {  7, 37, 67, 27, 57, 87, 17, 47, 77 },
127 
+  { 13, 43, 73,  3, 33, 63, 23, 53, 83 },
128 
+  { 19, 49, 79,  9, 39, 69, 29, 59, 89 },
129 
+  { 25, 55, 85, 15, 45, 75,  5, 35, 65 },
130 
+};
131 
+
132 
+static const uint16_t dv_audio_shuffle625[12][9] = {
133 
+  {   0,  36,  72,  26,  62,  98,  16,  52,  88}, /* 1st channel */
134 
+  {   6,  42,  78,  32,  68, 104,  22,  58,  94},
135 
+  {  12,  48,  84,   2,  38,  74,  28,  64, 100},
136 
+  {  18,  54,  90,   8,  44,  80,  34,  70, 106},
137 
+  {  24,  60,  96,  14,  50,  86,   4,  40,  76},
138 
+  {  30,  66, 102,  20,  56,  92,  10,  46,  82},
139 
+
140 
+  {   1,  37,  73,  27,  63,  99,  17,  53,  89}, /* 2nd channel */
141 
+  {   7,  43,  79,  33,  69, 105,  23,  59,  95},
142 
+  {  13,  49,  85,   3,  39,  75,  29,  65, 101},
143 
+  {  19,  55,  91,   9,  45,  81,  35,  71, 107},
144 
+  {  25,  61,  97,  15,  51,  87,   5,  41,  77},
145 
+  {  31,  67, 103,  21,  57,  93,  11,  47,  83},
146 
+};
147 
+
148 
+static const int dv_audio_frequency[3] = {
149 
+    48000, 44100, 32000,
150 
+};
151 
+
152 
+const DVprofile dv_profiles[2] = {
153 
+    { .dsf = 0,
154 
+      .frame_size = 120000,        /* 525/60 system (NTSC) */
155 
+      .difseg_size = 10,
156 
+      .frame_rate = 30000,
157 
+      .ltc_divisor = 30,
158 
+      .frame_rate_base = 1001,
159 
+      .height = 480,
160 
+/*    .video_place = dv_place_411, */
161 
+      .audio_stride = 90,
162 
+      .audio_min_samples = { 1580, 1452, 1053 }, /* for 48, 44.1 and 32Khz */
163 
+      .audio_samples_dist = { 1602, 1601, 1602, 1601, 1602 },
164 
+      .audio_shuffle = dv_audio_shuffle525,
165 
+    },
166 
+    { .dsf = 1,
167 
+      .frame_size = 144000,        /* 625/50 system (PAL) */
168 
+      .difseg_size = 12,
169 
+      .frame_rate = 25,
170 
+      .frame_rate_base = 1,
171 
+      .ltc_divisor = 25,
172 
+      .height = 576,
173 
+/*    .video_place = dv_place_420, */
174 
+      .audio_stride = 108,
175 
+      .audio_min_samples = { 1896, 1742, 1264 }, /* for 48, 44.1 and 32Khz */
176 
+      .audio_samples_dist = { 1920, 1920, 1920, 1920, 1920 },
177 
+      .audio_shuffle = dv_audio_shuffle525,
178 
+     }
179 
+};
180 
+
181 
+static inline uint16_t dv_audio_12to16(uint16_t sample)
182 
+{
183 
+    uint16_t shift, result;
184 
+
185 
+    sample = (sample < 0x800) ? sample : sample | 0xf000;
186 
+    shift = (sample & 0xf00) >> 8;
187 
+
188 
+    if (shift < 0x2 || shift > 0xd) {
189 
+	result = sample;
190 
+    } else if (shift < 0x8) {
191 
+        shift--;
192 
+	result = (sample - (256 * shift)) << shift;
193 
+    } else {
194 
+	shift = 0xe - shift;
195 
+	result = ((sample + ((256 * shift) + 1)) << shift) - 1;
196 
+    }
197 
+
198 
+    return result;
199 
+}
200 
+
201 
+static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf)
202 
+{
203 
+    struct tm tc;
204 
+    time_t ct;
205 
+    int ltc_frame;
206 
+
207 
+    buf[0] = (uint8_t)pack_id;
208 
+    switch (pack_id) {
209 
+    case dv_header525: /* I can't imagine why these two weren't defined as real */
210 
+    case dv_header625: /* packs in SMPTE314M -- they definitely look like ones */
211 
+          buf[1] = 0xf8 |               /* reserved -- always 1 */
212 
+	           (0 & 0x07);          /* APT: Track application ID */
213 
+          buf[2] = (0 << 7)    | /* TF1: audio data is 0 - valid; 1 - invalid */
214 
+	           (0x0f << 3) | /* reserved -- always 1 */
215 
+		   (0 & 0x07);   /* AP1: Audio application ID */
216 
+          buf[3] = (0 << 7)    | /* TF2: video data is 0 - valid; 1 - invalid */
217 
+	           (0x0f << 3) | /* reserved -- always 1 */
218 
+		   (0 & 0x07);   /* AP2: Video application ID */
219 
+          buf[4] = (0 << 7)    | /* TF3: subcode(SSYB) is 0 - valid; 1 - invalid */
220 
+	           (0x0f << 3) | /* reserved -- always 1 */
221 
+		   (0 & 0x07);   /* AP3: Subcode application ID */
222 
+	  break;
223 
+    case dv_timecode:
224 
+          ct = (time_t)(c->frames / ((float)c->sys->frame_rate /
225 
+                                     (float)c->sys->frame_rate_base));
226 
+          localtime_r(&ct, &tc);
227 
+          /*
228 
+           * LTC drop-frame frame counter drops two frames (0 and 1) every
229 
+           * minute, unless it is exactly divisible by 10
230 
+           */
231 
+          ltc_frame = (c->frames + 2*ct/60 - 2*ct/600) % c->sys->ltc_divisor;
232 
+	  buf[1] = (0 << 7) | /* Color fame: 0 - unsync; 1 - sync mode */
233 
+		   (1 << 6) | /* Drop frame timecode: 0 - nondrop; 1 - drop */
234 
+		   ((ltc_frame / 10) << 4) | /* Tens of frames */
235 
+		   (ltc_frame % 10);         /* Units of frames */
236 
+	  buf[2] = (1 << 7) | /* Biphase mark polarity correction: 0 - even; 1 - odd */
237 
+		   ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
238 
+		   (tc.tm_sec % 10);         /* Units of seconds */
239 
+	  buf[3] = (1 << 7) | /* Binary group flag BGF0 */
240 
+		   ((tc.tm_min / 10) << 4) | /* Tens of minutes */
241 
+		   (tc.tm_min % 10);         /* Units of minutes */
242 
+	  buf[4] = (1 << 7) | /* Binary group flag BGF2 */
243 
+		   (1 << 6) | /* Binary group flag BGF1 */
244 
+	           ((tc.tm_hour / 10) << 4) | /* Tens of hours */
245 
+		   (tc.tm_hour % 10);         /* Units of hours */
246 
+          break;
247 
+    case dv_audio_source:  /* AAUX source pack */
248 
+          buf[1] = (0 << 7) | /* locked mode       */
249 
+                   (1 << 6) | /* reserved -- always 1 */
250 
+	           (dv_audio_frame_size(c->sys, c->frames) -
251 
+		    c->sys->audio_min_samples[0]);
252 
+	                      /* # of samples      */
253 
+          buf[2] = (0 << 7) | /* multi-stereo      */
254 
+                   (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
255 
+                   (0 << 4) | /* pair bit: 0 -- one pair of channels */
256 
+	            0;        /* audio mode        */
257 
+          buf[3] = (1 << 7) | /* res               */
258 
+                   (1 << 6) | /* multi-language flag */
259 
+	           (c->sys->dsf << 5) | /*  system: 60fields/50fields */
260 
+	            0;        /* definition: 0 -- SD (525/625) */
261 
+          buf[4] = (1 << 7) | /* emphasis: 1 -- off */
262 
+                   (0 << 6) | /* emphasis time constant: 0 -- reserved */
263 
+	           (0 << 3) | /* frequency: 0 -- 48Khz, 1 -- 44,1Khz, 2 -- 32Khz */
264 
+                    0;        /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */
265 
+          break;
266 
+    case dv_audio_control:
267 
+          buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
268 
+                   (1 << 4) | /* input source: 1 -- digital input */
269 
+	           (3 << 2) | /* compression: 3 -- no information */
270 
+	            0;        /* misc. info/SMPTE emphasis off */
271 
+          buf[2] = (1 << 7) | /* recording start point: 1 -- no */
272 
+                   (1 << 6) | /* recording end point: 1 -- no */
273 
+	           (1 << 3) | /* recording mode: 1 -- original */
274 
+	            7;
275 
+          buf[3] = (1 << 7) | /* direction: 1 -- forward */
276 
+                    0x20;     /* speed */
277 
+          buf[4] = (1 << 7) | /* reserved -- always 1 */
278 
+                    0x7f;     /* genre category */
279 
+	  break;
280 
+    case dv_audio_recdate:
281 
+    case dv_viedo_recdate:  /* VAUX recording date */
282 
+          ct = c->start_time + (time_t)(c->frames /
283 
+	       ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
284 
+          localtime_r(&ct, &tc);
285 
+	  buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
286 
+	                 /* 0xff is very likely to be "unknown" */
287 
+	  buf[2] = (3 << 6) | /* reserved -- always 1 */
288 
+		   ((tc.tm_mday / 10) << 4) | /* Tens of day */
289 
+		   (tc.tm_mday % 10);         /* Units of day */
290 
+	  buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
291 
+		   (tc.tm_mon % 10);         /* Units of month */
292 
+	  buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
293 
+		   (tc.tm_year % 10);                 /* Units of year */
294 
+          break;
295 
+    case dv_audio_rectime:  /* AAUX recording time */
296 
+    case dv_video_rectime:  /* VAUX recording time */
297 
+          ct = c->start_time + (time_t)(c->frames /
298 
+	       ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
299 
+          localtime_r(&ct, &tc);
300 
+	  buf[1] = (3 << 6) | /* reserved -- always 1 */
301 
+		   0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
302 
+	  buf[2] = (1 << 7) | /* reserved -- always 1 */
303 
+		   ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
304 
+		   (tc.tm_sec % 10);         /* Units of seconds */
305 
+	  buf[3] = (1 << 7) | /* reserved -- always 1 */
306 
+		   ((tc.tm_min / 10) << 4) | /* Tens of minutes */
307 
+		   (tc.tm_min % 10);         /* Units of minutes */
308 
+	  buf[4] = (3 << 6) | /* reserved -- always 1 */
309 
+	           ((tc.tm_hour / 10) << 4) | /* Tens of hours */
310 
+		   (tc.tm_hour % 10);         /* Units of hours */
311 
+	  break;
312 
+    case dv_video_source:
313 
+	  buf[1] = 0xff; /* reserved -- always 1 */
314 
+	  buf[2] = (1 << 7) | /* B/W: 0 - b/w, 1 - color */
315 
+		   (1 << 6) | /* following CLF is valid - 0, invalid - 1 */
316 
+		   (3 << 4) | /* CLF: color frames id (see ITU-R BT.470-4) */
317 
+		   0xf; /* reserved -- always 1 */
318 
+	  buf[3] = (3 << 6) | /* reserved -- always 1 */
319 
+		   (c->sys->dsf << 5) | /*  system: 60fields/50fields */
320 
+		   0; /* signal type video compression */
321 
+	  buf[4] = 0xff; /* VISC: 0xff -- no information */
322 
+          break;
323 
+    case dv_video_control:
324 
+	  buf[1] = (0 << 6) | /* Copy generation management (CGMS) 0 -- free */
325 
+		   0x3f; /* reserved -- always 1 */
326 
+	  buf[2] = 0xc8 | /* reserved -- always b11001xxx */
327 
+		   c->aspect;
328 
+	  buf[3] = (1 << 7) | /* Frame/field flag 1 -- frame, 0 -- field */
329 
+		   (1 << 6) | /* First/second field flag 0 -- field 2, 1 -- field 1 */
330 
+		   (1 << 5) | /* Frame change flag 0 -- same picture as before, 1 -- different */
331 
+		   (1 << 4) | /* 1 - interlaced, 0 - noninterlaced */
332 
+		   0xc; /* reserved -- always b1100 */
333 
+	  buf[4] = 0xff; /* reserved -- always 1 */
334 
+          break;
335 
+    default:
336 
+          buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
337 
+    }
338 
+    return 5;
339 
+}
340 
+
341 
+static inline int dv_write_dif_id(enum dv_section_type t, uint8_t seq_num,
342 
+                                  uint8_t dif_num, uint8_t* buf)
343 
+{
344 
+    buf[0] = (uint8_t)t;    /* Section type */
345 
+    buf[1] = (seq_num<<4) | /* DIF seq number 0-9 for 525/60; 0-11 for 625/50 */
346 
+	     (0 << 3) |     /* FSC: for 50Mb/s 0 - first channel; 1 - second */
347 
+	     7;             /* reserved -- always 1 */
348 
+    buf[2] = dif_num;       /* DIF block number Video: 0-134, Audio: 0-8 */
349 
+    return 3;
350 
+}
351 
+
352 
+static inline int dv_write_ssyb_id(uint8_t syb_num, uint8_t fr, uint8_t* buf)
353 
+{
354 
+    if (syb_num == 0 || syb_num == 6) {
355 
+	buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
356 
+		 (0<<4)  | /* AP3 (Subcode application ID) */
357 
+		 0x0f;     /* reserved -- always 1 */
358 
+    }
359 
+    else if (syb_num == 11) {
360 
+	buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
361 
+                 0x7f;     /* reserved -- always 1 */
362 
+    }
363 
+    else {
364 
+	buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
365 
+                 (0<<4)  | /* APT (Track application ID) */
366 
+		 0x0f;     /* reserved -- always 1 */
367 
+    }
368 
+    buf[1] = 0xf0 |            /* reserved -- always 1 */
369 
+             (syb_num & 0x0f); /* SSYB number 0 - 11   */
370 
+    buf[2] = 0xff;             /* reserved -- always 1 */
371 
+    return 3;
372 
+}
373 
+
374 
+void dv_format_frame(DVMuxContext *c, uint8_t* buf)
375 
+{
376 
+    int i, j, k;
377 
+
378 
+    for (i = 0; i < c->sys->difseg_size; i++) {
379 
+       memset(buf, 0xff, 80 * 6); /* First 6 DIF blocks are for control data */
380 
+
381 
+       /* DV header: 1DIF */
382 
+       buf += dv_write_dif_id(dv_sect_header, i, 0, buf);
383 
+       buf += dv_write_pack((c->sys->dsf ? dv_header625 : dv_header525), c, buf);
384 
+       buf += 72; /* unused bytes */
385 
+
386 
+       /* DV subcode: 2DIFs */
387 
+       for (j = 0; j < 2; j++) {
388 
+          buf += dv_write_dif_id( dv_sect_subcode, i, j, buf);
389 
+	  for (k = 0; k < 6; k++) {
390 
+	     buf += dv_write_ssyb_id(k, (i < c->sys->difseg_size/2), buf);
391 
+	     buf += dv_write_pack(dv_ssyb_packs_dist[i][k], c, buf);
392 
+	  }
393 
+	  buf += 29; /* unused bytes */
394 
+       }
395 
+
396 
+       /* DV VAUX: 3DIFs */
397 
+       for (j = 0; j < 3; j++) {
398 
+	  buf += dv_write_dif_id(dv_sect_vaux, i, j, buf);
399 
+	  for (k = 0; k < 15 ; k++)
400 
+	     buf += dv_write_pack(dv_vaux_packs_dist[i][k], c, buf);
401 
+	  buf += 2; /* unused bytes */
402 
+       }
403 
+
404 
+       /* DV Audio/Video: 135 Video DIFs + 9 Audio DIFs */
405 
+       for (j = 0; j < 135; j++) {
406 
+            if (j%15 == 0) {
407 
+	        buf += dv_write_dif_id(dv_sect_audio, i, j/15, buf);
408 
+	        buf += dv_write_pack(dv_aaux_packs_dist[i][j/15], c, buf);
409 
+		buf += 72; /* shuffled PCM audio */
410 
+	    }
411 
+	    buf += dv_write_dif_id(dv_sect_video, i, j, buf);
412 
+	    buf += 77; /* 1 video macro block: 1 bytes control
413 
+			                       4 * 14 bytes Y 8x8 data
414 
+			                           10 bytes Cr 8x8 data
415 
+						   10 bytes Cb 8x8 data */
416 
+       }
417 
+    }
418 
+}
419 
+
420 
+void dv_inject_audio(DVMuxContext *c, uint8_t* pcm, uint8_t* frame_ptr)
421 
+{
422 
+    int i, j, d, of;
423 
+    for (i = 0; i < c->sys->difseg_size; i++) {
424 
+       frame_ptr += 6 * 80; /* skip DIF segment header */
425 
+       for (j = 0; j < 9; j++) {
426 
+          for (d = 8; d < 80; d+=2) {
427 
+	     of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
428 
+	     frame_ptr[d] = pcm[of*2+1]; // FIXME: may be we have to admit
429 
+	     frame_ptr[d+1] = pcm[of*2]; //        that DV is a big endian PCM
430 
+          }
431 
+          frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
432 
+       }
433 
+    }
434 
+}
435 
+
436 
+void dv_inject_video(DVMuxContext *c, uint8_t* video_data, uint8_t* frame_ptr)
437 
+{
438 
+    int i, j;
439 
+    int ptr = 0;
440 
+
441 
+    for (i = 0; i < c->sys->difseg_size; i++) {
442 
+       ptr += 6 * 80; /* skip DIF segment header */
443 
+       for (j = 0; j < 135; j++) {
444 
+            if (j%15 == 0)
445 
+	        ptr += 80; /* skip Audio DIF */
446 
+	    ptr += 3;
447 
+	    memcpy(frame_ptr + ptr, video_data + ptr, 77);
448 
+	    ptr += 77;
449 
+       }
450 
+    }
451 
+}
452 
+
453 
+int dv_audio_frame_size(const DVprofile* sys, int frame)
454 
+{
455 
+    return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist)/
456 
+		                            sizeof(sys->audio_samples_dist[0]))];
457 
+}
458 
+
459 
+const DVprofile* dv_frame_profile(uint8_t* frame)
460 
+{
461 
+    return &dv_profiles[!!(frame[3] & 0x80)]; /* Header, DSF flag */
462 
+}
463 
+
464 
+/*
465 
+ * This is the dumbest implementation of all -- it simply looks at
466 
+ * a fixed offset and if pack isn't there -- fails. We might want
467 
+ * to have a fallback mechanism for complete search of missing packs.
468 
+ */
469 
+const uint8_t* dv_extract_pack(uint8_t* frame, enum dv_pack_type t)
470 
+{
471 
+    int offs;
472 
+
473 
+    switch (t) {
474 
+    case dv_audio_source:
475 
+          offs = (80*6 + 80*16*3 + 3);
476 
+	  break;
477 
+    case dv_audio_control:
478 
+          offs = (80*6 + 80*16*4 + 3);
479 
+	  break;
480 
+    case dv_video_control:
481 
+          offs = (80*5 + 48 + 5);
482 
+          break;
483 
+    default:
484 
+          return NULL;
485 
+    }
486 
+
487 
+    return (frame[offs] == t ? &frame[offs] : NULL);
488 
+}
489 
+
490 
+/*
491 
+ * There's a couple of assumptions being made here:
492 
+ * 1. By default we silence erroneous (0x8000/16bit 0x800/12bit) audio samples.
493 
+ *    We can pass them upwards when ffmpeg will be ready to deal with them.
494 
+ * 2. We don't do software emphasis.
495 
+ * 3. Audio is always returned as 16bit linear samples: 12bit nonlinear samples
496 
+ *    are converted into 16bit linear ones.
497 
+ */
498 
+int dv_extract_audio(uint8_t* frame, uint8_t* pcm, AVCodecContext* avctx)
499 
+{
500 
+    int size, i, j, d, of, smpls, freq, quant;
501 
+    uint16_t lc, rc;
502 
+    const DVprofile* sys;
503 
+    const uint8_t* as_pack;
504 
+
505 
+    as_pack = dv_extract_pack(frame, dv_audio_source);
506 
+    if (!as_pack)    /* No audio ? */
507 
+	return 0;
508 
+
509 
+    sys = dv_frame_profile(frame);
510 
+    smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
511 
+    freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
512 
+    quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
513 
+
514 
+    if (quant > 1)
515 
+	return -1; /* Unsupported quantization */
516 
+
517 
+    avctx->sample_rate = dv_audio_frequency[freq];
518 
+    avctx->channels = 2;
519 
+    avctx->bit_rate = avctx->channels * avctx->sample_rate * 16;
520 
+    // What about:
521 
+    // avctx->frame_size =
522 
+
523 
+    size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
524 
+
525 
+    /* for each DIF segment */
526 
+    for (i = 0; i < sys->difseg_size; i++) {
527 
+       frame += 6 * 80; /* skip DIF segment header */
528 
+       for (j = 0; j < 9; j++) {
529 
+          for (d = 8; d < 80; d += 2) {
530 
+	     if (quant == 0) {  /* 16bit quantization */
531 
+		 of = sys->audio_shuffle[i][j] + (d - 8)/2 * sys->audio_stride;
532 
+		 pcm[of*2] = frame[d+1]; // FIXME: may be we have to admit
533 
+		 pcm[of*2+1] = frame[d]; //        that DV is a big endian PCM
534 
+		 if (pcm[of*2+1] == 0x80 && pcm[of*2] == 0x00)
535 
+		     pcm[of*2+1] = 0;
536 
+	      } else {           /* 12bit quantization */
537 
+		 if (i >= sys->difseg_size/2)
538 
+	             goto out;  /* We're not doing 4ch at this time */
539 
+
540 
+		 lc = ((uint16_t)frame[d] << 4) |
541 
+		      ((uint16_t)frame[d+2] >> 4);
542 
+		 rc = ((uint16_t)frame[d+1] << 4) |
543 
+	              ((uint16_t)frame[d+2] & 0x0f);
544 
+		 lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
545 
+		 rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
546 
+
547 
+		 of = sys->audio_shuffle[i][j] + (d - 8)/3 * sys->audio_stride;
548 
+		 pcm[of*2] = lc & 0xff; // FIXME: may be we have to admit
549 
+		 pcm[of*2+1] = lc >> 8; //        that DV is a big endian PCM
550 
+		 of = sys->audio_shuffle[i+sys->difseg_size/2][j] +
551 
+		      (d - 8)/3 * sys->audio_stride;
552 
+		 pcm[of*2] = rc & 0xff; // FIXME: may be we have to admit
553 
+		 pcm[of*2+1] = rc >> 8; //        that DV is a big endian PCM
554 
+		 ++d;
555 
+	      }
556 
+	  }
557 
+
558 
+	  frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
559 
+        }
560 
+    }
561 
+
562 
+out:
563 
+    return size;
564 
+}
565 
+
566 
+/* FIXME: The following three functions could be underengineered ;-) */
567 
+void dv_assemble_frame(DVMuxContext *c, uint8_t* video, uint8_t* audio, int asize)
568 
+{
569 
+    uint8_t pcm[8192];
570 
+    uint8_t* frame = &c->frame_buf[0];
571 
+    int fsize, reqasize;
572 
+
573 
+    if (c->has_audio && c->has_video) {  /* must be a stale frame */
574 
+        dv_format_frame(c, frame);
575 
+	c->frames++;
576 
+	c->has_audio = c->has_video = 0;
577 
+    }
578 
+
579 
+    if (video) {
580 
+        /* FIXME: we have to have more sensible approach than this one */
581 
+	if (c->has_video)
582 
+	    fprintf(stderr, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
583 
+
584 
+        dv_inject_video(c, video, frame);
585 
+	c->has_video = 1;
586 
+    }
587 
+    if (audio) {
588 
+        reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);
589 
+        fsize = fifo_size(&c->audio_data, c->audio_data.rptr);
590 
+	if (fsize + asize >= reqasize) {
591 
+            if (fsize >= reqasize) {
592 
+	        fifo_read(&c->audio_data, &pcm[0], reqasize, &c->audio_data.rptr);
593 
+            } else {
594 
+	        fifo_read(&c->audio_data, &pcm[0], fsize, &c->audio_data.rptr);
595 
+                memcpy(&pcm[fsize], &audio[0], reqasize - fsize);
596 
+		audio += reqasize - fsize;
597 
+		asize -= reqasize - fsize;
598 
+	    }
599 
+	    dv_inject_audio(c, &pcm[0], frame);
600 
+	    c->has_audio = 1;
601 
+	}
602 
+
603 
+        /* FIXME: we have to have more sensible approach than this one */
604 
+        if (fifo_size(&c->audio_data, c->audio_data.rptr) + asize >= AVCODEC_MAX_AUDIO_FRAME_SIZE)
605 
+	    fprintf(stderr, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
606 
+	fifo_write(&c->audio_data, audio, asize, &c->audio_data.wptr);
607 
+    }
608 
+}
609 
+
610 
+int dv_core_init(DVMuxContext *c, AVStream *streams[])
611 
+{
612 
+    /* We have to sort out where audio and where video stream is */
613 
+    if (streams[0]->codec.codec_type == CODEC_TYPE_VIDEO &&
614 
+        streams[1]->codec.codec_type == CODEC_TYPE_AUDIO) {
615 
+       c->vst = 0;
616 
+       c->ast = 1;
617 
+    }
618 
+    else if (streams[1]->codec.codec_type == CODEC_TYPE_VIDEO &&
619 
+             streams[0]->codec.codec_type == CODEC_TYPE_AUDIO) {
620 
+	    c->vst = 1;
621 
+ 	    c->ast = 0;
622 
+    } else
623 
+        goto bail_out;
624 
+
625 
+    /* Some checks -- DV format is very picky about its incoming streams */
626 
+    if (streams[c->vst]->codec.codec_id != CODEC_ID_DVVIDEO ||
627 
+	streams[c->ast]->codec.codec_id != CODEC_ID_PCM_S16LE)
628 
+       goto bail_out;
629 
+    if (streams[c->ast]->codec.sample_rate != 48000 ||
630 
+	streams[c->ast]->codec.channels != 2)
631 
+       goto bail_out;
632 
+
633 
+    if (streams[c->vst]->codec.frame_rate == 25 &&
634 
+        streams[c->vst]->codec.frame_rate_base == 1) {
635 
+        /* May be we have to pick sys for every frame */
636 
+	c->sys = &dv_profiles[1];
637 
+    }
638 
+    else if (streams[c->vst]->codec.frame_rate == 30000 &&
639 
+             streams[c->vst]->codec.frame_rate_base == 1001) {
640 
+	/* May be we have to pick sys for every frame */
641 
+	c->sys = &dv_profiles[0];
642 
+    } else
643 
+        goto bail_out;
644 
+
645 
+    /* Ok, everything seems to be in working order */
646 
+    c->frames = 0;
647 
+    c->has_audio = c->has_video = 0;
648 
+    c->start_time = time(NULL);
649 
+    c->aspect = 0; /* 4:3 is the default */
650 
+    if (streams[c->vst]->codec.aspect_ratio == 16.0 / 9.0)
651 
+        c->aspect = 0x07;
652 
+
653 
+    if (fifo_init(&c->audio_data, AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0)
654 
+        goto bail_out;
655 
+
656 
+    dv_format_frame(c, &c->frame_buf[0]);
657 
+
658 
+    return 0;
659 
+
660 
+bail_out:
661 
+    return -1;
662 
+}
663 
+
664 
+void dv_core_delete(DVMuxContext *c)
665 
+{
666 
+    fifo_free(&c->audio_data);
667 
+}
libavformat/dvcore.h
History View file @ 118e91f
0 668 
new file mode 100644
... ... 
@@ -0,0 +1,73 @@
0 
+/*
1 
+ * DV format muxer/demuxer
2 
+ * Copyright (c) 2003 Roman Shaposhnik
3 
+ *
4 
+ * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
5 
+ * of DV technical info, and SMPTE 314M specification.
6 
+ *
7 
+ * This library is free software; you can redistribute it and/or
8 
+ * modify it under the terms of the GNU Lesser General Public
9 
+ * License as published by the Free Software Foundation; either
10 
+ * version 2 of the License, or (at your option) any later version.
11 
+ *
12 
+ * This library is distributed in the hope that it will be useful,
13 
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 
+ * Lesser General Public License for more details.
16 
+ *
17 
+ * You should have received a copy of the GNU Lesser General Public
18 
+ * License along with this library; if not, write to the Free Software
19 
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20 
+ */
21 
+#include <time.h>
22 
+#include "avformat.h"
23 
+
24 
+/*
25 
+ * DVprofile is used to express the differences between various
26 
+ * DV flavors. For now it's primarily used for differentiating
27 
+ * 525/60 and 625/50, but the plans are to use it for various
28 
+ * DV specs as well (e.g. SMPTE314M vs. IEC 61834).
29 
+ */
30 
+typedef struct DVprofile {
31 
+    int            dsf;                  /* value of the dsf in the DV header */
32 
+    int            frame_size;           /* total size of one frame in bytes */
33 
+    int            difseg_size;          /* number of DIF segments */
34 
+    int            frame_rate;
35 
+    int            frame_rate_base;
36 
+    int            ltc_divisor;          /* FPS from the LTS standpoint */
37 
+    int            height;               /* picture height in pixels */
38 
+    uint16_t       *video_place;         /* positions of all DV macro blocks */
39 
+
40 
+    int            audio_stride;         /* size of audio_shuffle table */
41 
+    int            audio_min_samples[3]; /* min ammount of audio samples */
42 
+                                         /* for 48Khz, 44.1Khz and 32Khz */
43 
+    int            audio_samples_dist[5];/* how many samples are supposed to be */
44 
+                                         /* in each frame in a 5 frames window */
45 
+    const uint16_t (*audio_shuffle)[9];  /* PCM shuffling table */
46 
+} DVprofile;
47 
+
48 
+typedef struct DVMuxContext {
49 
+    const DVprofile*  sys;    /* Current DV profile. E.g.: 525/60, 625/50 */
50 
+    uint8_t     frame_buf[144000]; /* frame under contruction */
51 
+    FifoBuffer  audio_data;   /* Fifo for storing excessive amounts of PCM */
52 
+    int         frames;       /* Number of a current frame */
53 
+    time_t      start_time;   /* Start time of recording */
54 
+    uint8_t     aspect;       /* Aspect ID 0 - 4:3, 7 - 16:9 */
55 
+    int         ast, vst;     /* Audio and Video stream indecies */
56 
+    int         has_audio;    /* frame under contruction has audio */
57 
+    int         has_video;    /* frame under contruction has video */
58 
+} DVMuxContext;
59 
+
60 
+void dv_format_frame(DVMuxContext *, uint8_t*);
61 
+void dv_inject_audio(DVMuxContext *, uint8_t*, uint8_t*);
62 
+void dv_inject_video(DVMuxContext *, uint8_t*, uint8_t*);
63 
+
64 
+int  dv_extract_audio(uint8_t*, uint8_t*, AVCodecContext*);
65 
+
66 
+int  dv_audio_frame_size(const DVprofile*, int);
67 
+
68 
+void dv_assemble_frame(DVMuxContext *, uint8_t*, uint8_t*, int);
69 
+int  dv_core_init(DVMuxContext *, AVStream*[]);
70 
+void dv_core_delete(DVMuxContext *);
71 
+
72 
+const DVprofile* dv_frame_profile(uint8_t*);