2 * DV format muxer/demuxer
3 * Copyright (c) 2003 Roman Shaposhnik
5 * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
6 * of DV technical info.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 * DVprofile is used to express the differences between various
27 * DV flavors. For now it's primarily used for differentiating
28 * 525/60 and 625/50, but the plans are to use it for various
29 * DV specs as well (e.g. SMPTE314M vs. IEC 61834).
31 typedef struct DVprofile {
32 int dsf; /* value of the dsf in the DV header */
33 int frame_size; /* total size of one frame in bytes */
34 int difseg_size; /* number of DIF segments */
37 int ltc_divisor; /* FPS from the LTS standpoint */
38 int height; /* picture height in pixels */
39 uint16_t *video_place; /* positions of all DV macro blocks */
41 int audio_stride; /* size of audio_shuffle table */
42 int audio_min_samples[3]; /* min ammount of audio samples */
43 /* for 48Khz, 44.1Khz and 32Khz */
44 int audio_samples_dist[5];/* how many samples are supposed to be */
45 /* in each frame in a 5 frames window */
46 const uint16_t (*audio_shuffle)[9]; /* PCM shuffling table */
49 typedef struct DVMuxContext {
50 const DVprofile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
51 uint8_t frame_buf[144000]; /* frame under contruction */
52 FifoBuffer audio_data; /* Fifo for storing excessive amounts of PCM */
53 int frames; /* Number of a current frame */
54 time_t start_time; /* Start time of recording */
55 uint8_t aspect; /* Aspect ID 0 - 4:3, 7 - 16:9 */
56 int ast, vst; /* Audio and Video stream indecies */
57 int has_audio; /* frame under contruction has audio */
58 int has_video; /* frame under contruction has video */
61 void dv_format_frame(DVMuxContext *, uint8_t*);
62 void dv_inject_audio(DVMuxContext *, const uint8_t*, uint8_t*);
63 void dv_inject_video(DVMuxContext *, const uint8_t*, uint8_t*);
65 int dv_extract_audio(uint8_t*, uint8_t*, AVCodecContext*);
67 int dv_audio_frame_size(const DVprofile*, int);
69 void dv_assemble_frame(DVMuxContext *c, const uint8_t*, const uint8_t*, int);
70 int dv_core_init(DVMuxContext *, AVStream*[]);
71 void dv_core_delete(DVMuxContext *);
73 const DVprofile* dv_frame_profile(uint8_t*);