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/* 
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 * General DV muxer/demuxer 
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 * Copyright (c) 2003 Roman Shaposhnick
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 *
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 * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
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 * of DV technical info.
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 *
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 * Raw DV format
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 * Copyright (c) 2002 Fabrice Bellard.
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 */
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#include <time.h>
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#include "avformat.h"
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#include "dvdata.h"
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#include "dv.h"
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struct DVDemuxContext {
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    AVFormatContext* fctx;
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    AVStream*        vst;
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    AVStream*        ast[2];       
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    AVPacket         audio_pkt[2];
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    int              ach;
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};
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struct DVMuxContext {
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    const DVprofile*  sys;    /* Current DV profile. E.g.: 525/60, 625/50 */
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    uint8_t     frame_buf[144000]; /* frame under contruction */
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    FifoBuffer  audio_data;   /* Fifo for storing excessive amounts of PCM */
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    int         frames;       /* Number of a current frame */
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    time_t      start_time;   /* Start time of recording */
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    uint8_t     aspect;       /* Aspect ID 0 - 4:3, 7 - 16:9 */
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    int         has_audio;    /* frame under contruction has audio */
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    int         has_video;    /* frame under contruction has video */
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};
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enum dv_section_type {
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     dv_sect_header  = 0x1f,
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     dv_sect_subcode = 0x3f,
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     dv_sect_vaux    = 0x56,
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     dv_sect_audio   = 0x76,
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     dv_sect_video   = 0x96,
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};
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enum dv_pack_type {
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     dv_header525     = 0x3f, /* see dv_write_pack for important details on */ 
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     dv_header625     = 0xbf, /* these two packs */
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     dv_timecode      = 0x13,
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     dv_audio_source  = 0x50,
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     dv_audio_control = 0x51,
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     dv_audio_recdate = 0x52,
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     dv_audio_rectime = 0x53,
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     dv_video_source  = 0x60,
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     dv_video_control = 0x61,
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     dv_viedo_recdate = 0x62,
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     dv_video_rectime = 0x63,
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     dv_unknown_pack  = 0xff,
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};
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72

    
73

    
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/*
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 * The reason why the following three big ugly looking tables are
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 * here is my lack of DV spec IEC 61834. The tables were basically 
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 * constructed to make code that places packs in SSYB, VAUX and 
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 * AAUX blocks very simple and table-driven. They conform to the
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 * SMPTE 314M and the output of my personal DV camcorder, neither
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 * of which is sufficient for a reliable DV stream producing. Thus
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 * while code is still in development I'll be gathering input from
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 * people with different DV equipment and modifying the tables to
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 * accommodate all the quirks. Later on, if possible, some of them
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 * will be folded into smaller tables and/or switch-if logic. For 
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 * now, my only excuse is -- they don't eat up that much of a space.
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 */
87

    
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static const int dv_ssyb_packs_dist[12][6] = {
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    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
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    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
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    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
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    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
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    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
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    { 0x13, 0x13, 0x13, 0x13, 0x13, 0x13 },
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    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
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    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
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    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
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    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
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    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
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    { 0x13, 0x62, 0x63, 0x13, 0x62, 0x63 },
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};
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static const int dv_vaux_packs_dist[12][15] = {
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    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
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      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
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    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
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      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
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    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
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      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
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    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
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      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
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    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
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      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
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    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
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      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
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    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
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      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
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    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
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      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
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    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
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      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
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    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
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      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
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    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
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      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
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    { 0x60, 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff, 
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      0x60, 0x61, 0x62, 0x63, 0xff, 0xff },
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};
129

    
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static const int dv_aaux_packs_dist[12][9] = {
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    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
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    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
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    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
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    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
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    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
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    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
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    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
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    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
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    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
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    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
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    { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
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    { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
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};
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static inline uint16_t dv_audio_12to16(uint16_t sample)
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{
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    uint16_t shift, result;
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    sample = (sample < 0x800) ? sample : sample | 0xf000;
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    shift = (sample & 0xf00) >> 8;
151

    
152
    if (shift < 0x2 || shift > 0xd) {
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        result = sample;
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    } else if (shift < 0x8) {
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        shift--;
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        result = (sample - (256 * shift)) << shift;
157
    } else {
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        shift = 0xe - shift;
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        result = ((sample + ((256 * shift) + 1)) << shift) - 1;
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    }
161

    
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    return result;
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}
164

    
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static int dv_audio_frame_size(const DVprofile* sys, int frame)
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{
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    return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist)/
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                                            sizeof(sys->audio_samples_dist[0]))];
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}
170

    
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static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf)
172
{
173
    struct tm tc;
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    time_t ct;
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    int ltc_frame;
176

    
177
    buf[0] = (uint8_t)pack_id;
178
    switch (pack_id) {
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    case dv_header525: /* I can't imagine why these two weren't defined as real */
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    case dv_header625: /* packs in SMPTE314M -- they definitely look like ones */
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          buf[1] = 0xf8 |               /* reserved -- always 1 */
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                   (0 & 0x07);          /* APT: Track application ID */
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          buf[2] = (0 << 7)    | /* TF1: audio data is 0 - valid; 1 - invalid */
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                   (0x0f << 3) | /* reserved -- always 1 */
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                   (0 & 0x07);   /* AP1: Audio application ID */
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          buf[3] = (0 << 7)    | /* TF2: video data is 0 - valid; 1 - invalid */  
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                   (0x0f << 3) | /* reserved -- always 1 */
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                   (0 & 0x07);   /* AP2: Video application ID */
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          buf[4] = (0 << 7)    | /* TF3: subcode(SSYB) is 0 - valid; 1 - invalid */ 
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                   (0x0f << 3) | /* reserved -- always 1 */
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                   (0 & 0x07);   /* AP3: Subcode application ID */
192
          break;
193
    case dv_timecode:
194
          ct = (time_t)(c->frames / ((float)c->sys->frame_rate / 
195
                                     (float)c->sys->frame_rate_base));
196
          localtime_r(&ct, &tc);
197
          /* 
198
           * LTC drop-frame frame counter drops two frames (0 and 1) every 
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           * minute, unless it is exactly divisible by 10
200
           */
201
          ltc_frame = (c->frames + 2*ct/60 - 2*ct/600) % c->sys->ltc_divisor;
202
          buf[1] = (0 << 7) | /* Color fame: 0 - unsync; 1 - sync mode */
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                   (1 << 6) | /* Drop frame timecode: 0 - nondrop; 1 - drop */
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                   ((ltc_frame / 10) << 4) | /* Tens of frames */
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                   (ltc_frame % 10);         /* Units of frames */
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          buf[2] = (1 << 7) | /* Biphase mark polarity correction: 0 - even; 1 - odd */
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                   ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
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                   (tc.tm_sec % 10);         /* Units of seconds */
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          buf[3] = (1 << 7) | /* Binary group flag BGF0 */
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                   ((tc.tm_min / 10) << 4) | /* Tens of minutes */
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                   (tc.tm_min % 10);         /* Units of minutes */
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          buf[4] = (1 << 7) | /* Binary group flag BGF2 */
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                   (1 << 6) | /* Binary group flag BGF1 */
214
                   ((tc.tm_hour / 10) << 4) | /* Tens of hours */
215
                   (tc.tm_hour % 10);         /* Units of hours */
216
          break;
217
    case dv_audio_source:  /* AAUX source pack */
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          buf[1] = (0 << 7) | /* locked mode       */
219
                   (1 << 6) | /* reserved -- always 1 */
220
                   (dv_audio_frame_size(c->sys, c->frames) -
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                    c->sys->audio_min_samples[0]);
222
                              /* # of samples      */
223
          buf[2] = (0 << 7) | /* multi-stereo      */
224
                   (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
225
                   (0 << 4) | /* pair bit: 0 -- one pair of channels */
226
                    0;        /* audio mode        */
227
          buf[3] = (1 << 7) | /* res               */
228
                   (1 << 6) | /* multi-language flag */
229
                   (c->sys->dsf << 5) | /*  system: 60fields/50fields */
230
                    0;        /* definition: 0 -- SD (525/625) */
231
          buf[4] = (1 << 7) | /* emphasis: 1 -- off */
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                   (0 << 6) | /* emphasis time constant: 0 -- reserved */
233
                   (0 << 3) | /* frequency: 0 -- 48Khz, 1 -- 44,1Khz, 2 -- 32Khz */
234
                    0;        /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */                            
235
          break;
236
    case dv_audio_control:
237
          buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
238
                   (1 << 4) | /* input source: 1 -- digital input */
239
                   (3 << 2) | /* compression: 3 -- no information */
240
                    0;        /* misc. info/SMPTE emphasis off */
241
          buf[2] = (1 << 7) | /* recording start point: 1 -- no */
242
                   (1 << 6) | /* recording end point: 1 -- no */
243
                   (1 << 3) | /* recording mode: 1 -- original */
244
                    7;         
245
          buf[3] = (1 << 7) | /* direction: 1 -- forward */
246
                    0x20;     /* speed */
247
          buf[4] = (1 << 7) | /* reserved -- always 1 */
248
                    0x7f;     /* genre category */
249
          break;
250
    case dv_audio_recdate:
251
    case dv_viedo_recdate:  /* VAUX recording date */
252
          ct = c->start_time + (time_t)(c->frames / 
253
               ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
254
          localtime_r(&ct, &tc);
255
          buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
256
                         /* 0xff is very likely to be "unknown" */
257
          buf[2] = (3 << 6) | /* reserved -- always 1 */
258
                   ((tc.tm_mday / 10) << 4) | /* Tens of day */
259
                   (tc.tm_mday % 10);         /* Units of day */
260
          buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
261
                   (tc.tm_mon % 10);         /* Units of month */
262
          buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
263
                   (tc.tm_year % 10);                 /* Units of year */
264
          break;
265
    case dv_audio_rectime:  /* AAUX recording time */
266
    case dv_video_rectime:  /* VAUX recording time */
267
          ct = c->start_time + (time_t)(c->frames / 
268
               ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
269
          localtime_r(&ct, &tc);
270
          buf[1] = (3 << 6) | /* reserved -- always 1 */
271
                   0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
272
          buf[2] = (1 << 7) | /* reserved -- always 1 */ 
273
                   ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
274
                   (tc.tm_sec % 10);         /* Units of seconds */
275
          buf[3] = (1 << 7) | /* reserved -- always 1 */
276
                   ((tc.tm_min / 10) << 4) | /* Tens of minutes */
277
                   (tc.tm_min % 10);         /* Units of minutes */
278
          buf[4] = (3 << 6) | /* reserved -- always 1 */ 
279
                   ((tc.tm_hour / 10) << 4) | /* Tens of hours */
280
                   (tc.tm_hour % 10);         /* Units of hours */
281
          break;
282
    case dv_video_source:
283
          buf[1] = 0xff; /* reserved -- always 1 */
284
          buf[2] = (1 << 7) | /* B/W: 0 - b/w, 1 - color */
285
                   (1 << 6) | /* following CLF is valid - 0, invalid - 1 */
286
                   (3 << 4) | /* CLF: color frames id (see ITU-R BT.470-4) */
287
                   0xf; /* reserved -- always 1 */
288
          buf[3] = (3 << 6) | /* reserved -- always 1 */
289
                   (c->sys->dsf << 5) | /*  system: 60fields/50fields */
290
                   0; /* signal type video compression */
291
          buf[4] = 0xff; /* VISC: 0xff -- no information */
292
          break;
293
    case dv_video_control:
294
          buf[1] = (0 << 6) | /* Copy generation management (CGMS) 0 -- free */
295
                   0x3f; /* reserved -- always 1 */
296
          buf[2] = 0xc8 | /* reserved -- always b11001xxx */
297
                   c->aspect;
298
          buf[3] = (1 << 7) | /* Frame/field flag 1 -- frame, 0 -- field */
299
                   (1 << 6) | /* First/second field flag 0 -- field 2, 1 -- field 1 */
300
                   (1 << 5) | /* Frame change flag 0 -- same picture as before, 1 -- different */
301
                   (1 << 4) | /* 1 - interlaced, 0 - noninterlaced */
302
                   0xc; /* reserved -- always b1100 */
303
          buf[4] = 0xff; /* reserved -- always 1 */
304
          break;
305
    default:
306
          buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
307
    }
308
    return 5;
309
}
310

    
311
static inline int dv_write_dif_id(enum dv_section_type t, uint8_t seq_num, 
312
                                  uint8_t dif_num, uint8_t* buf)
313
{
314
    buf[0] = (uint8_t)t;    /* Section type */
315
    buf[1] = (seq_num<<4) | /* DIF seq number 0-9 for 525/60; 0-11 for 625/50 */
316
             (0 << 3) |     /* FSC: for 50Mb/s 0 - first channel; 1 - second */
317
             7;             /* reserved -- always 1 */
318
    buf[2] = dif_num;       /* DIF block number Video: 0-134, Audio: 0-8 */
319
    return 3;
320
}
321

    
322
static inline int dv_write_ssyb_id(uint8_t syb_num, uint8_t fr, uint8_t* buf)
323
{
324
    if (syb_num == 0 || syb_num == 6) {
325
        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
326
                 (0<<4)  | /* AP3 (Subcode application ID) */
327
                 0x0f;     /* reserved -- always 1 */
328
    } 
329
    else if (syb_num == 11) {
330
        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
331
                 0x7f;     /* reserved -- always 1 */
332
    }
333
    else {
334
        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
335
                 (0<<4)  | /* APT (Track application ID) */
336
                 0x0f;     /* reserved -- always 1 */
337
    }
338
    buf[1] = 0xf0 |            /* reserved -- always 1 */
339
             (syb_num & 0x0f); /* SSYB number 0 - 11   */
340
    buf[2] = 0xff;             /* reserved -- always 1 */
341
    return 3;
342
}
343

    
344
static void dv_format_frame(DVMuxContext *c, uint8_t* buf)
345
{
346
    int i, j, k;
347
    
348
    for (i = 0; i < c->sys->difseg_size; i++) {
349
       memset(buf, 0xff, 80 * 6); /* First 6 DIF blocks are for control data */
350
       
351
       /* DV header: 1DIF */
352
       buf += dv_write_dif_id(dv_sect_header, i, 0, buf);
353
       buf += dv_write_pack((c->sys->dsf ? dv_header625 : dv_header525), c, buf);
354
       buf += 72; /* unused bytes */
355
                                   
356
       /* DV subcode: 2DIFs */
357
       for (j = 0; j < 2; j++) {
358
          buf += dv_write_dif_id( dv_sect_subcode, i, j, buf);
359
          for (k = 0; k < 6; k++) {
360
             buf += dv_write_ssyb_id(k, (i < c->sys->difseg_size/2), buf);
361
             buf += dv_write_pack(dv_ssyb_packs_dist[i][k], c, buf);
362
          }
363
          buf += 29; /* unused bytes */
364
       }
365
       
366
       /* DV VAUX: 3DIFs */
367
       for (j = 0; j < 3; j++) {
368
          buf += dv_write_dif_id(dv_sect_vaux, i, j, buf);
369
          for (k = 0; k < 15 ; k++)
370
             buf += dv_write_pack(dv_vaux_packs_dist[i][k], c, buf);
371
          buf += 2; /* unused bytes */
372
       } 
373
       
374
       /* DV Audio/Video: 135 Video DIFs + 9 Audio DIFs */
375
       for (j = 0; j < 135; j++) {
376
            if (j%15 == 0) {
377
                buf += dv_write_dif_id(dv_sect_audio, i, j/15, buf);
378
                buf += dv_write_pack(dv_aaux_packs_dist[i][j/15], c, buf);
379
                buf += 72; /* shuffled PCM audio */
380
            }
381
            buf += dv_write_dif_id(dv_sect_video, i, j, buf);
382
            buf += 77; /* 1 video macro block: 1 bytes control
383
                                               4 * 14 bytes Y 8x8 data
384
                                                   10 bytes Cr 8x8 data
385
                                                   10 bytes Cb 8x8 data */
386
       }
387
    }
388
}
389

    
390
static void dv_inject_audio(DVMuxContext *c, const uint8_t* pcm, uint8_t* frame_ptr)
391
{
392
    int i, j, d, of;
393
    for (i = 0; i < c->sys->difseg_size; i++) {
394
       frame_ptr += 6 * 80; /* skip DIF segment header */
395
       for (j = 0; j < 9; j++) {
396
          for (d = 8; d < 80; d+=2) {
397
             of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
398
             frame_ptr[d] = pcm[of*2+1]; // FIXME: may be we have to admit
399
             frame_ptr[d+1] = pcm[of*2]; //        that DV is a big endian PCM       
400
          }
401
          frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
402
       }
403
    }
404
}
405

    
406
static void dv_inject_video(DVMuxContext *c, const uint8_t* video_data, uint8_t* frame_ptr)
407
{
408
    int i, j;
409
    int ptr = 0;
410

    
411
    for (i = 0; i < c->sys->difseg_size; i++) {
412
       ptr += 6 * 80; /* skip DIF segment header */
413
       for (j = 0; j < 135; j++) {
414
            if (j%15 == 0)
415
                ptr += 80; /* skip Audio DIF */
416
            ptr += 3;
417
            memcpy(frame_ptr + ptr, video_data + ptr, 77);
418
            ptr += 77;
419
       }
420
    }
421
}
422

    
423
/* 
424
 * This is the dumbest implementation of all -- it simply looks at
425
 * a fixed offset and if pack isn't there -- fails. We might want
426
 * to have a fallback mechanism for complete search of missing packs.
427
 */
428
static const uint8_t* dv_extract_pack(uint8_t* frame, enum dv_pack_type t)
429
{
430
    int offs;
431
    
432
    switch (t) {
433
    case dv_audio_source:
434
          offs = (80*6 + 80*16*3 + 3);
435
          break;
436
    case dv_audio_control:
437
          offs = (80*6 + 80*16*4 + 3);
438
          break;
439
    case dv_video_control:
440
          offs = (80*5 + 48 + 5);
441
          break;
442
    default:
443
          return NULL;
444
    }   
445

    
446
    return (frame[offs] == t ? &frame[offs] : NULL);
447
}
448

    
449
/* 
450
 * There's a couple of assumptions being made here:
451
 * 1. By default we silence erroneous (0x8000/16bit 0x800/12bit) audio samples.
452
 *    We can pass them upwards when ffmpeg will be ready to deal with them.
453
 * 2. We don't do software emphasis.
454
 * 3. Audio is always returned as 16bit linear samples: 12bit nonlinear samples
455
 *    are converted into 16bit linear ones.
456
 */
457
static int dv_extract_audio(uint8_t* frame, uint8_t* pcm, uint8_t* pcm2)
458
{
459
    int size, i, j, d, of, smpls, freq, quant, half_ch;
460
    uint16_t lc, rc;
461
    const DVprofile* sys;
462
    const uint8_t* as_pack;
463
    
464
    as_pack = dv_extract_pack(frame, dv_audio_source);
465
    if (!as_pack)    /* No audio ? */
466
        return 0;
467
   
468
    sys = dv_frame_profile(frame);
469
    smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
470
    freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
471
    quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
472
    
473
    if (quant > 1)
474
        return -1; /* Unsupported quantization */
475

    
476
    size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
477
    half_ch = sys->difseg_size/2;
478

    
479
    /* for each DIF segment */
480
    for (i = 0; i < sys->difseg_size; i++) {
481
       frame += 6 * 80; /* skip DIF segment header */
482
       if (quant == 1 && i == half_ch) {
483
           if (!pcm2)
484
               break;
485
           else
486
               pcm = pcm2;
487
       }
488

    
489
       for (j = 0; j < 9; j++) {
490
          for (d = 8; d < 80; d += 2) {
491
             if (quant == 0) {  /* 16bit quantization */
492
                 of = sys->audio_shuffle[i][j] + (d - 8)/2 * sys->audio_stride;
493
                 if (of*2 >= size)
494
                     continue;
495
                 
496
                 pcm[of*2] = frame[d+1]; // FIXME: may be we have to admit
497
                 pcm[of*2+1] = frame[d]; //        that DV is a big endian PCM
498
                 if (pcm[of*2+1] == 0x80 && pcm[of*2] == 0x00)
499
                     pcm[of*2+1] = 0;
500
              } else {           /* 12bit quantization */
501
                 lc = ((uint16_t)frame[d] << 4) | 
502
                      ((uint16_t)frame[d+2] >> 4);
503
                 rc = ((uint16_t)frame[d+1] << 4) |
504
                      ((uint16_t)frame[d+2] & 0x0f);
505
                 lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
506
                 rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
507

    
508
                 of = sys->audio_shuffle[i%half_ch][j] + (d - 8)/3 * sys->audio_stride;
509
                 if (of*2 >= size)
510
                     continue;
511

    
512
                 pcm[of*2] = lc & 0xff; // FIXME: may be we have to admit
513
                 pcm[of*2+1] = lc >> 8; //        that DV is a big endian PCM
514
                 of = sys->audio_shuffle[i%half_ch+half_ch][j] + 
515
                      (d - 8)/3 * sys->audio_stride;
516
                 pcm[of*2] = rc & 0xff; // FIXME: may be we have to admit
517
                 pcm[of*2+1] = rc >> 8; //        that DV is a big endian PCM
518
                 ++d;
519
              }
520
          }
521
                
522
          frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
523
        }
524
    }
525

    
526
    return size;
527
}
528

    
529
static int dv_extract_audio_info(DVDemuxContext* c, uint8_t* frame)
530
{
531
    const uint8_t* as_pack;
532
    const DVprofile* sys;
533
    int freq, smpls, quant, i;
534

    
535
    sys = dv_frame_profile(frame);
536
    as_pack = dv_extract_pack(frame, dv_audio_source);
537
    if (!as_pack || !sys) {    /* No audio ? */
538
        c->ach = 0;
539
        return -1;
540
    }
541
    
542
    smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
543
    freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
544
    quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
545
    c->ach = (quant && freq == 2) ? 2 : 1;
546

    
547
    /* The second stereo channel could appear in IEC 61834 stream only */
548
    if (c->ach == 2 && !c->ast[1]) {
549
        c->ast[1] = av_new_stream(c->fctx, 0);
550
        if (c->ast[1]) {
551
            c->ast[1]->codec.codec_type = CODEC_TYPE_AUDIO;
552
            c->ast[1]->codec.codec_id = CODEC_ID_PCM_S16LE;
553
        } else
554
            c->ach = 1;
555
    }
556
    for (i=0; i<c->ach; i++) {
557
       c->ast[i]->codec.sample_rate = dv_audio_frequency[freq];
558
       c->ast[i]->codec.channels = 2;
559
       c->ast[i]->codec.bit_rate = 2 * dv_audio_frequency[freq] * 16;
560
    }
561
    
562
    return (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */;
563
}
564

    
565
static int dv_extract_video_info(DVDemuxContext *c, uint8_t* frame)
566
{
567
    const DVprofile* sys; 
568
    const uint8_t* vsc_pack;
569
    AVCodecContext* avctx;
570
    int apt, is16_9;
571
    int size = 0;
572
    
573
    sys = dv_frame_profile(frame);
574
    if (sys) {
575
        avctx = &c->vst->codec;
576
        
577
        avctx->frame_rate = sys->frame_rate;
578
        avctx->frame_rate_base = sys->frame_rate_base;
579
        avctx->width = sys->width;
580
        avctx->height = sys->height;
581
        avctx->pix_fmt = sys->pix_fmt;
582
        
583
        vsc_pack = dv_extract_pack(frame, dv_video_control);
584
        apt = frame[4] & 0x07;
585
        is16_9 = (vsc_pack && (vsc_pack[2] & 0x07) == (apt?0x02:0x07));
586
        avctx->sample_aspect_ratio = sys->sar[is16_9];
587
        
588
        size = sys->frame_size;
589
    }
590
    return size;
591
}
592

    
593
/* 
594
 * The following 6 functions constitute our interface to the world
595
 */
596

    
597
int dv_assemble_frame(DVMuxContext *c, AVStream* st,
598
                      const uint8_t* data, int data_size, uint8_t** frame)
599
{
600
    uint8_t pcm[8192];
601
    int fsize, reqasize;
602
   
603
    *frame = &c->frame_buf[0];
604
    if (c->has_audio && c->has_video) {  /* must be a stale frame */
605
        dv_format_frame(c, *frame);
606
        c->frames++;
607
        c->has_audio = c->has_video = 0;
608
    }
609
    
610
    if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
611
        /* FIXME: we have to have more sensible approach than this one */
612
        if (c->has_video)
613
            av_log(&st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
614
            
615
        dv_inject_video(c, data, *frame);
616
        c->has_video = 1;
617
        data_size = 0;
618
    } 
619
    
620
    reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);
621
    fsize = fifo_size(&c->audio_data, c->audio_data.rptr);
622
    if (st->codec.codec_type == CODEC_TYPE_AUDIO || (c->has_video && fsize >= reqasize)) { 
623
        if (fsize + data_size >= reqasize && !c->has_audio) {
624
            if (fsize >= reqasize) {
625
                fifo_read(&c->audio_data, &pcm[0], reqasize, &c->audio_data.rptr);
626
            } else {
627
                fifo_read(&c->audio_data, &pcm[0], fsize, &c->audio_data.rptr);
628
                memcpy(&pcm[fsize], &data[0], reqasize - fsize);
629
                data += reqasize - fsize;
630
                data_size -= reqasize - fsize;
631
            }
632
            dv_inject_audio(c, &pcm[0], *frame);
633
            c->has_audio = 1;
634
        }
635
    
636
        /* FIXME: we have to have more sensible approach than this one */
637
        if (fifo_size(&c->audio_data, c->audio_data.rptr) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE)
638
            av_log(&st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
639
        fifo_write(&c->audio_data, (uint8_t *)data, data_size, &c->audio_data.wptr);
640
    }
641

    
642
    return (c->has_audio && c->has_video) ? c->sys->frame_size : 0;
643
}
644

    
645
DVMuxContext* dv_init_mux(AVFormatContext* s)
646
{
647
    DVMuxContext *c;
648
    AVStream *vst;
649
    AVStream *ast;
650

    
651
    c = av_mallocz(sizeof(DVMuxContext));
652
    if (!c)
653
        return NULL;
654

    
655
    if (s->nb_streams != 2)
656
        goto bail_out;
657

    
658
    /* We have to sort out where audio and where video stream is */
659
    if (s->streams[0]->codec.codec_type == CODEC_TYPE_VIDEO &&
660
        s->streams[1]->codec.codec_type == CODEC_TYPE_AUDIO) {
661
       vst = s->streams[0];
662
       ast = s->streams[1];
663
    }
664
    else if (s->streams[1]->codec.codec_type == CODEC_TYPE_VIDEO &&
665
             s->streams[0]->codec.codec_type == CODEC_TYPE_AUDIO) {
666
           vst = s->streams[1];
667
           ast = s->streams[0];
668
    } else
669
        goto bail_out;
670
  
671
    /* Some checks -- DV format is very picky about its incoming streams */
672
    if (vst->codec.codec_id != CODEC_ID_DVVIDEO ||
673
        ast->codec.codec_id != CODEC_ID_PCM_S16LE)
674
       goto bail_out;
675
    if (ast->codec.sample_rate != 48000 ||
676
        ast->codec.channels != 2)
677
       goto bail_out;
678

    
679
    c->sys = dv_codec_profile(&vst->codec);
680
    if (!c->sys)
681
        goto bail_out;
682
    
683
    /* Ok, everything seems to be in working order */
684
    c->frames = 0;
685
    c->has_audio = c->has_video = 0;
686
    c->start_time = time(NULL);
687
    c->aspect = 0; /* 4:3 is the default */
688
    if ((int)(av_q2d(vst->codec.sample_aspect_ratio) * vst->codec.width / vst->codec.height * 10) == 17) /* 16:9 */ 
689
        c->aspect = 0x07;
690

    
691
    if (fifo_init(&c->audio_data, 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0)
692
        goto bail_out;
693

    
694
    dv_format_frame(c, &c->frame_buf[0]);
695

    
696
    return c;
697
    
698
bail_out:
699
    av_free(c);
700
    return NULL;
701
}
702

    
703
void dv_delete_mux(DVMuxContext *c)
704
{    
705
    fifo_free(&c->audio_data);
706
}
707

    
708
DVDemuxContext* dv_init_demux(AVFormatContext *s)
709
{
710
    DVDemuxContext *c;
711

    
712
    c = av_mallocz(sizeof(DVDemuxContext));
713
    if (!c)
714
        return NULL;
715

    
716
    c->vst = av_new_stream(s, 0);
717
    c->ast[0] = av_new_stream(s, 0);
718
    if (!c->vst || !c->ast[0])
719
        goto fail;
720
    c->fctx = s;
721
    c->ast[1] = NULL;
722
    c->ach = 0;
723
    c->audio_pkt[0].size = 0;
724
    c->audio_pkt[1].size = 0;
725
    
726
    c->vst->codec.codec_type = CODEC_TYPE_VIDEO;
727
    c->vst->codec.codec_id = CODEC_ID_DVVIDEO;
728
    c->vst->codec.bit_rate = 25000000;
729
    
730
    c->ast[0]->codec.codec_type = CODEC_TYPE_AUDIO;
731
    c->ast[0]->codec.codec_id = CODEC_ID_PCM_S16LE;
732
   
733
    s->ctx_flags |= AVFMTCTX_NOHEADER; 
734
    
735
    return c;
736
    
737
fail:
738
    if (c->vst)
739
        av_free(c->vst);
740
    if (c->ast[0])
741
        av_free(c->ast[0]);
742
    av_free(c);
743
    return NULL;
744
}
745

    
746
static void __destruct_pkt(struct AVPacket *pkt)
747
{
748
    pkt->data = NULL; pkt->size = 0;
749
    return;
750
}
751

    
752
int dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
753
{
754
    int size = -1;
755
    int i;
756

    
757
    for (i=0; i<c->ach; i++) {
758
       if (c->ast[i] && c->audio_pkt[i].size) {
759
           *pkt = c->audio_pkt[i];
760
           c->audio_pkt[i].size = 0;
761
           size = pkt->size;
762
           break;
763
       }
764
    }
765

    
766
    return size;
767
}
768

    
769
int dv_produce_packet(DVDemuxContext *c, AVPacket *pkt, 
770
                      uint8_t* buf, int buf_size)
771
{
772
    int size, i;
773
   
774
    if (buf_size < 4 || buf_size < dv_frame_profile(buf)->frame_size)
775
        return -1;   /* Broken frame, or not enough data */
776

    
777
    /* Queueing audio packet */
778
    /* FIXME: in case of no audio/bad audio we have to do something */
779
    size = dv_extract_audio_info(c, buf);
780
    c->audio_pkt[0].data = c->audio_pkt[1].data = NULL;
781
    for (i=0; i<c->ach; i++) {
782
       if (av_new_packet(&c->audio_pkt[i], size) < 0)
783
           return AVERROR_NOMEM;
784
       c->audio_pkt[i].stream_index = c->ast[i]->index;
785
    }
786
    dv_extract_audio(buf, c->audio_pkt[0].data, c->audio_pkt[1].data);
787
    
788
    /* Now it's time to return video packet */
789
    size = dv_extract_video_info(c, buf);
790
    av_init_packet(pkt);
791
    pkt->destruct = __destruct_pkt;
792
    pkt->data     = buf;
793
    pkt->size     = size; 
794
    pkt->flags   |= PKT_FLAG_KEY;
795
    pkt->stream_index = c->vst->id;
796

    
797
    return size;
798
}
799
                           
800
/************************************************************
801
 * Implementation of the easiest DV storage of all -- raw DV.
802
 ************************************************************/
803
 
804
typedef struct RawDVContext {
805
    uint8_t         buf[144000];
806
    DVDemuxContext* dv_demux;
807
} RawDVContext;
808

    
809
static int dv_read_header(AVFormatContext *s,
810
                          AVFormatParameters *ap)
811
{
812
    RawDVContext *c = s->priv_data;
813
    c->dv_demux = dv_init_demux(s);
814
   
815
    return c->dv_demux ? 0 : -1;
816
}
817

    
818

    
819
static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
820
{
821
    int size;
822
    RawDVContext *c = s->priv_data; 
823
  
824
    size = dv_get_packet(c->dv_demux, pkt);
825
    
826
    if (size < 0) {
827
        if (get_buffer(&s->pb, c->buf, 4) <= 0) 
828
            return -EIO;
829
    
830
        size = dv_frame_profile(c->buf)->frame_size;
831
        if (get_buffer(&s->pb, c->buf + 4, size - 4) <= 0)
832
            return -EIO;
833

    
834
        size = dv_produce_packet(c->dv_demux, pkt, c->buf, size);
835
    } 
836
    
837
    return size;
838
}
839

    
840
static int dv_read_close(AVFormatContext *s)
841
{
842
    RawDVContext *c = s->priv_data;
843
    av_free(c->dv_demux);
844
    return 0;
845
}
846

    
847
static int dv_write_header(AVFormatContext *s)
848
{
849
    s->priv_data = dv_init_mux(s);
850
    if (!s->priv_data) {
851
        av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
852
                    "Make sure that you supply exactly two streams:\n"
853
                    "     video: 25fps or 29.97fps, audio: 2ch/48Khz/PCM\n");
854
        return -1;
855
    }
856
    return 0;
857
}
858

    
859
static int dv_write_packet(struct AVFormatContext *s, 
860
                           int stream_index,
861
                           const uint8_t *buf, int size, int64_t pts)
862
{
863
    uint8_t* frame;
864
    int fsize;
865
   
866
    fsize = dv_assemble_frame((DVMuxContext *)s->priv_data, s->streams[stream_index],
867
                              buf, size, &frame);
868
    if (fsize > 0) {
869
        put_buffer(&s->pb, frame, fsize); 
870
        put_flush_packet(&s->pb);
871
    } 
872
    return 0;
873
}
874

    
875
/* 
876
 * We might end up with some extra A/V data without matching counterpart.
877
 * E.g. video data without enough audio to write the complete frame.
878
 * Currently we simply drop the last frame. I don't know whether this 
879
 * is the best strategy of all
880
 */
881
static int dv_write_trailer(struct AVFormatContext *s)
882
{
883
    dv_delete_mux((DVMuxContext *)s->priv_data);
884
    return 0;
885
}
886

    
887
static AVInputFormat dv_iformat = {
888
    "dv",
889
    "DV video format",
890
    sizeof(RawDVContext),
891
    NULL,
892
    dv_read_header,
893
    dv_read_packet,
894
    dv_read_close,
895
    .extensions = "dv",
896
};
897

    
898
static AVOutputFormat dv_oformat = {
899
    "dv",
900
    "DV video format",
901
    NULL,
902
    "dv",
903
    sizeof(DVMuxContext),
904
    CODEC_ID_PCM_S16LE,
905
    CODEC_ID_DVVIDEO,
906
    dv_write_header,
907
    dv_write_packet,
908
    dv_write_trailer,
909
};
910

    
911
int ff_dv_init(void)
912
{
913
    av_register_input_format(&dv_iformat);
914
    av_register_output_format(&dv_oformat);
915
    return 0;
916
}