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1
/* 
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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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    int              frames;
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    uint64_t         abytes;
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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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/*
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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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 */
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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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};
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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;
150
    
151
    sample = (sample < 0x800) ? sample : sample | 0xf000;
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    shift = (sample & 0xf00) >> 8;
153

    
154
    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;
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    } else {
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        shift = 0xe - shift;
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        result = ((sample + ((256 * shift) + 1)) << shift) - 1;
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    }
163

    
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    return result;
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}
166

    
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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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}
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static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf)
174
{
175
    struct tm tc;
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    time_t ct;
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    int ltc_frame;
178

    
179
    buf[0] = (uint8_t)pack_id;
180
    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 */
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          break;
195
    case dv_timecode:
196
          ct = (time_t)(c->frames / ((float)c->sys->frame_rate / 
197
                                     (float)c->sys->frame_rate_base));
198
          brktimegm(ct, &tc);
199
          /* 
200
           * LTC drop-frame frame counter drops two frames (0 and 1) every 
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           * minute, unless it is exactly divisible by 10
202
           */
203
          ltc_frame = (c->frames + 2*ct/60 - 2*ct/600) % c->sys->ltc_divisor;
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          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 */
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                   ((tc.tm_hour / 10) << 4) | /* Tens of hours */
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                   (tc.tm_hour % 10);         /* Units of hours */
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          break;
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    case dv_audio_source:  /* AAUX source pack */
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          buf[1] = (0 << 7) | /* locked mode       */
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                   (1 << 6) | /* reserved -- always 1 */
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                   (dv_audio_frame_size(c->sys, c->frames) -
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                    c->sys->audio_min_samples[0]);
224
                              /* # of samples      */
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          buf[2] = (0 << 7) | /* multi-stereo      */
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                   (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
227
                   (0 << 4) | /* pair bit: 0 -- one pair of channels */
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                    0;        /* audio mode        */
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          buf[3] = (1 << 7) | /* res               */
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                   (1 << 6) | /* multi-language flag */
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                   (c->sys->dsf << 5) | /*  system: 60fields/50fields */
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                    0;        /* definition: 0 -- SD (525/625) */
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          buf[4] = (1 << 7) | /* emphasis: 1 -- off */
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                   (0 << 6) | /* emphasis time constant: 0 -- reserved */
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                   (0 << 3) | /* frequency: 0 -- 48Khz, 1 -- 44,1Khz, 2 -- 32Khz */
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                    0;        /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */                            
237
          break;
238
    case dv_audio_control:
239
          buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
240
                   (1 << 4) | /* input source: 1 -- digital input */
241
                   (3 << 2) | /* compression: 3 -- no information */
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                    0;        /* misc. info/SMPTE emphasis off */
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          buf[2] = (1 << 7) | /* recording start point: 1 -- no */
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                   (1 << 6) | /* recording end point: 1 -- no */
245
                   (1 << 3) | /* recording mode: 1 -- original */
246
                    7;         
247
          buf[3] = (1 << 7) | /* direction: 1 -- forward */
248
                    0x20;     /* speed */
249
          buf[4] = (1 << 7) | /* reserved -- always 1 */
250
                    0x7f;     /* genre category */
251
          break;
252
    case dv_audio_recdate:
253
    case dv_viedo_recdate:  /* VAUX recording date */
254
          ct = c->start_time + (time_t)(c->frames / 
255
               ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
256
          brktimegm(ct, &tc);
257
          buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
258
                         /* 0xff is very likely to be "unknown" */
259
          buf[2] = (3 << 6) | /* reserved -- always 1 */
260
                   ((tc.tm_mday / 10) << 4) | /* Tens of day */
261
                   (tc.tm_mday % 10);         /* Units of day */
262
          buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
263
                   ((tc.tm_mon / 10) << 4) |    /* Tens of month */
264
                   (tc.tm_mon  % 10);           /* Units of month */
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          buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
266
                   (tc.tm_year % 10);                 /* Units of year */
267
          break;
268
    case dv_audio_rectime:  /* AAUX recording time */
269
    case dv_video_rectime:  /* VAUX recording time */
270
          ct = c->start_time + (time_t)(c->frames / 
271
               ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
272
          brktimegm(ct, &tc);
273
          buf[1] = (3 << 6) | /* reserved -- always 1 */
274
                   0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
275
          buf[2] = (1 << 7) | /* reserved -- always 1 */ 
276
                   ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
277
                   (tc.tm_sec % 10);         /* Units of seconds */
278
          buf[3] = (1 << 7) | /* reserved -- always 1 */
279
                   ((tc.tm_min / 10) << 4) | /* Tens of minutes */
280
                   (tc.tm_min % 10);         /* Units of minutes */
281
          buf[4] = (3 << 6) | /* reserved -- always 1 */ 
282
                   ((tc.tm_hour / 10) << 4) | /* Tens of hours */
283
                   (tc.tm_hour % 10);         /* Units of hours */
284
          break;
285
    case dv_video_source:
286
          buf[1] = 0xff; /* reserved -- always 1 */
287
          buf[2] = (1 << 7) | /* B/W: 0 - b/w, 1 - color */
288
                   (1 << 6) | /* following CLF is valid - 0, invalid - 1 */
289
                   (3 << 4) | /* CLF: color frames id (see ITU-R BT.470-4) */
290
                   0xf; /* reserved -- always 1 */
291
          buf[3] = (3 << 6) | /* reserved -- always 1 */
292
                   (c->sys->dsf << 5) | /*  system: 60fields/50fields */
293
                   0; /* signal type video compression */
294
          buf[4] = 0xff; /* VISC: 0xff -- no information */
295
          break;
296
    case dv_video_control:
297
          buf[1] = (0 << 6) | /* Copy generation management (CGMS) 0 -- free */
298
                   0x3f; /* reserved -- always 1 */
299
          buf[2] = 0xc8 | /* reserved -- always b11001xxx */
300
                   c->aspect;
301
          buf[3] = (1 << 7) | /* Frame/field flag 1 -- frame, 0 -- field */
302
                   (1 << 6) | /* First/second field flag 0 -- field 2, 1 -- field 1 */
303
                   (1 << 5) | /* Frame change flag 0 -- same picture as before, 1 -- different */
304
                   (1 << 4) | /* 1 - interlaced, 0 - noninterlaced */
305
                   0xc; /* reserved -- always b1100 */
306
          buf[4] = 0xff; /* reserved -- always 1 */
307
          break;
308
    default:
309
          buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
310
    }
311
    return 5;
312
}
313

    
314
static inline int dv_write_dif_id(enum dv_section_type t, uint8_t seq_num, 
315
                                  uint8_t dif_num, uint8_t* buf)
316
{
317
    buf[0] = (uint8_t)t;    /* Section type */
318
    buf[1] = (seq_num<<4) | /* DIF seq number 0-9 for 525/60; 0-11 for 625/50 */
319
             (0 << 3) |     /* FSC: for 50Mb/s 0 - first channel; 1 - second */
320
             7;             /* reserved -- always 1 */
321
    buf[2] = dif_num;       /* DIF block number Video: 0-134, Audio: 0-8 */
322
    return 3;
323
}
324

    
325
static inline int dv_write_ssyb_id(uint8_t syb_num, uint8_t fr, uint8_t* buf)
326
{
327
    if (syb_num == 0 || syb_num == 6) {
328
        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
329
                 (0<<4)  | /* AP3 (Subcode application ID) */
330
                 0x0f;     /* reserved -- always 1 */
331
    } 
332
    else if (syb_num == 11) {
333
        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
334
                 0x7f;     /* reserved -- always 1 */
335
    }
336
    else {
337
        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
338
                 (0<<4)  | /* APT (Track application ID) */
339
                 0x0f;     /* reserved -- always 1 */
340
    }
341
    buf[1] = 0xf0 |            /* reserved -- always 1 */
342
             (syb_num & 0x0f); /* SSYB number 0 - 11   */
343
    buf[2] = 0xff;             /* reserved -- always 1 */
344
    return 3;
345
}
346

    
347
static void dv_format_frame(DVMuxContext *c, uint8_t* buf)
348
{
349
    int i, j, k;
350
    
351
    for (i = 0; i < c->sys->difseg_size; i++) {
352
       memset(buf, 0xff, 80 * 6); /* First 6 DIF blocks are for control data */
353
       
354
       /* DV header: 1DIF */
355
       buf += dv_write_dif_id(dv_sect_header, i, 0, buf);
356
       buf += dv_write_pack((c->sys->dsf ? dv_header625 : dv_header525), c, buf);
357
       buf += 72; /* unused bytes */
358
                                   
359
       /* DV subcode: 2DIFs */
360
       for (j = 0; j < 2; j++) {
361
          buf += dv_write_dif_id( dv_sect_subcode, i, j, buf);
362
          for (k = 0; k < 6; k++) {
363
             buf += dv_write_ssyb_id(k, (i < c->sys->difseg_size/2), buf);
364
             buf += dv_write_pack(dv_ssyb_packs_dist[i][k], c, buf);
365
          }
366
          buf += 29; /* unused bytes */
367
       }
368
       
369
       /* DV VAUX: 3DIFs */
370
       for (j = 0; j < 3; j++) {
371
          buf += dv_write_dif_id(dv_sect_vaux, i, j, buf);
372
          for (k = 0; k < 15 ; k++)
373
             buf += dv_write_pack(dv_vaux_packs_dist[i][k], c, buf);
374
          buf += 2; /* unused bytes */
375
       } 
376
       
377
       /* DV Audio/Video: 135 Video DIFs + 9 Audio DIFs */
378
       for (j = 0; j < 135; j++) {
379
            if (j%15 == 0) {
380
                memset(buf, 0xff, 80);
381
                buf += dv_write_dif_id(dv_sect_audio, i, j/15, buf);
382
                buf += 77; /* audio control & shuffled PCM audio */
383
            }
384
            buf += dv_write_dif_id(dv_sect_video, i, j, buf);
385
            buf += 77; /* 1 video macro block: 1 bytes control
386
                                               4 * 14 bytes Y 8x8 data
387
                                                   10 bytes Cr 8x8 data
388
                                                   10 bytes Cb 8x8 data */
389
       }
390
    }
391
}
392

    
393
static void dv_inject_audio(DVMuxContext *c, const uint8_t* pcm, uint8_t* frame_ptr)
394
{
395
    int i, j, d, of, size;
396
    size = 4 * dv_audio_frame_size(c->sys, c->frames);
397
    for (i = 0; i < c->sys->difseg_size; i++) {
398
       frame_ptr += 6 * 80; /* skip DIF segment header */
399
       for (j = 0; j < 9; j++) {
400
          dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3]);
401
          for (d = 8; d < 80; d+=2) {
402
             of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
403
             if (of*2 >= size)
404
                 continue;
405
             
406
             frame_ptr[d] = pcm[of*2+1]; // FIXME: may be we have to admit
407
             frame_ptr[d+1] = pcm[of*2]; //        that DV is a big endian PCM       
408
          }
409
          frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
410
       }
411
    }
412
}
413

    
414
static void dv_inject_video(DVMuxContext *c, const uint8_t* video_data, uint8_t* frame_ptr)
415
{
416
    int i, j;
417
    int ptr = 0;
418

    
419
    for (i = 0; i < c->sys->difseg_size; i++) {
420
       ptr += 6 * 80; /* skip DIF segment header */
421
       for (j = 0; j < 135; j++) {
422
            if (j%15 == 0)
423
                ptr += 80; /* skip Audio DIF */
424
            ptr += 3;
425
            memcpy(frame_ptr + ptr, video_data + ptr, 77);
426
            ptr += 77;
427
       }
428
    }
429
}
430

    
431
/* 
432
 * This is the dumbest implementation of all -- it simply looks at
433
 * a fixed offset and if pack isn't there -- fails. We might want
434
 * to have a fallback mechanism for complete search of missing packs.
435
 */
436
static const uint8_t* dv_extract_pack(uint8_t* frame, enum dv_pack_type t)
437
{
438
    int offs;
439
    
440
    switch (t) {
441
    case dv_audio_source:
442
          offs = (80*6 + 80*16*3 + 3);
443
          break;
444
    case dv_audio_control:
445
          offs = (80*6 + 80*16*4 + 3);
446
          break;
447
    case dv_video_control:
448
          offs = (80*5 + 48 + 5);
449
          break;
450
    default:
451
          return NULL;
452
    }   
453

    
454
    return (frame[offs] == t ? &frame[offs] : NULL);
455
}
456

    
457
/* 
458
 * There's a couple of assumptions being made here:
459
 * 1. By default we silence erroneous (0x8000/16bit 0x800/12bit) audio samples.
460
 *    We can pass them upwards when ffmpeg will be ready to deal with them.
461
 * 2. We don't do software emphasis.
462
 * 3. Audio is always returned as 16bit linear samples: 12bit nonlinear samples
463
 *    are converted into 16bit linear ones.
464
 */
465
static int dv_extract_audio(uint8_t* frame, uint8_t* pcm, uint8_t* pcm2)
466
{
467
    int size, i, j, d, of, smpls, freq, quant, half_ch;
468
    uint16_t lc, rc;
469
    const DVprofile* sys;
470
    const uint8_t* as_pack;
471
    
472
    as_pack = dv_extract_pack(frame, dv_audio_source);
473
    if (!as_pack)    /* No audio ? */
474
        return 0;
475
   
476
    sys = dv_frame_profile(frame);
477
    smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
478
    freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
479
    quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
480
    
481
    if (quant > 1)
482
        return -1; /* Unsupported quantization */
483

    
484
    size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
485
    half_ch = sys->difseg_size/2;
486

    
487
    /* for each DIF segment */
488
    for (i = 0; i < sys->difseg_size; i++) {
489
       frame += 6 * 80; /* skip DIF segment header */
490
       if (quant == 1 && i == half_ch) {
491
           if (!pcm2)
492
               break;
493
           else
494
               pcm = pcm2;
495
       }
496

    
497
       for (j = 0; j < 9; j++) {
498
          for (d = 8; d < 80; d += 2) {
499
             if (quant == 0) {  /* 16bit quantization */
500
                 of = sys->audio_shuffle[i][j] + (d - 8)/2 * sys->audio_stride;
501
                 if (of*2 >= size)
502
                     continue;
503
                 
504
                 pcm[of*2] = frame[d+1]; // FIXME: may be we have to admit
505
                 pcm[of*2+1] = frame[d]; //        that DV is a big endian PCM
506
                 if (pcm[of*2+1] == 0x80 && pcm[of*2] == 0x00)
507
                     pcm[of*2+1] = 0;
508
              } else {           /* 12bit quantization */
509
                 lc = ((uint16_t)frame[d] << 4) | 
510
                      ((uint16_t)frame[d+2] >> 4);
511
                 rc = ((uint16_t)frame[d+1] << 4) |
512
                      ((uint16_t)frame[d+2] & 0x0f);
513
                 lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
514
                 rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
515

    
516
                 of = sys->audio_shuffle[i%half_ch][j] + (d - 8)/3 * sys->audio_stride;
517
                 if (of*2 >= size)
518
                     continue;
519

    
520
                 pcm[of*2] = lc & 0xff; // FIXME: may be we have to admit
521
                 pcm[of*2+1] = lc >> 8; //        that DV is a big endian PCM
522
                 of = sys->audio_shuffle[i%half_ch+half_ch][j] + 
523
                      (d - 8)/3 * sys->audio_stride;
524
                 pcm[of*2] = rc & 0xff; // FIXME: may be we have to admit
525
                 pcm[of*2+1] = rc >> 8; //        that DV is a big endian PCM
526
                 ++d;
527
              }
528
          }
529
                
530
          frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
531
        }
532
    }
533

    
534
    return size;
535
}
536

    
537
static int dv_extract_audio_info(DVDemuxContext* c, uint8_t* frame)
538
{
539
    const uint8_t* as_pack;
540
    const DVprofile* sys;
541
    int freq, smpls, quant, i, ach;
542

    
543
    sys = dv_frame_profile(frame);
544
    as_pack = dv_extract_pack(frame, dv_audio_source);
545
    if (!as_pack || !sys) {    /* No audio ? */
546
        c->ach = 0;
547
        return -1;
548
    }
549
    
550
    smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
551
    freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
552
    quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
553
    ach = (quant && freq == 2) ? 2 : 1;
554

    
555
    /* Dynamic handling of the audio streams in DV */
556
    for (i=0; i<ach; i++) {
557
       if (!c->ast[i]) {
558
           c->ast[i] = av_new_stream(c->fctx, 0);
559
           if (!c->ast[i])
560
               break;
561
           av_set_pts_info(c->ast[i], 64, 1, 30000);
562
           c->ast[i]->codec.codec_type = CODEC_TYPE_AUDIO;
563
           c->ast[i]->codec.codec_id = CODEC_ID_PCM_S16LE;
564
       }
565
       c->ast[i]->codec.sample_rate = dv_audio_frequency[freq];
566
       c->ast[i]->codec.channels = 2;
567
       c->ast[i]->codec.bit_rate = 2 * dv_audio_frequency[freq] * 16;
568
       c->ast[i]->start_time = 0;
569
    }
570
    c->ach = i;
571
    
572
    return (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */;
573
}
574

    
575
static int dv_extract_video_info(DVDemuxContext *c, uint8_t* frame)
576
{
577
    const DVprofile* sys; 
578
    const uint8_t* vsc_pack;
579
    AVCodecContext* avctx;
580
    int apt, is16_9;
581
    int size = 0;
582
    
583
    sys = dv_frame_profile(frame);
584
    if (sys) {
585
        avctx = &c->vst->codec;
586
        
587
        avctx->frame_rate = sys->frame_rate;
588
        avctx->frame_rate_base = sys->frame_rate_base;
589
        avctx->width = sys->width;
590
        avctx->height = sys->height;
591
        avctx->pix_fmt = sys->pix_fmt;
592
        
593
        /* finding out SAR is a little bit messy */
594
        vsc_pack = dv_extract_pack(frame, dv_video_control);
595
        apt = frame[4] & 0x07;
596
        is16_9 = (vsc_pack && ((vsc_pack[2] & 0x07) == 0x02 ||
597
                               (!apt && (vsc_pack[2] & 0x07) == 0x07)));
598
        avctx->sample_aspect_ratio = sys->sar[is16_9];
599
        
600
        size = sys->frame_size;
601
    }
602
    return size;
603
}
604

    
605
/* 
606
 * The following 6 functions constitute our interface to the world
607
 */
608

    
609
int dv_assemble_frame(DVMuxContext *c, AVStream* st,
610
                      const uint8_t* data, int data_size, uint8_t** frame)
611
{
612
    uint8_t pcm[8192];
613
    int fsize, reqasize;
614
   
615
    *frame = &c->frame_buf[0];
616
    if (c->has_audio && c->has_video) {  /* must be a stale frame */
617
        dv_format_frame(c, *frame);
618
        c->frames++;
619
        if (c->has_audio > 0)
620
            c->has_audio = 0;
621
        c->has_video = 0;
622
    }
623
    
624
    if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
625
        /* FIXME: we have to have more sensible approach than this one */
626
        if (c->has_video)
627
            av_log(&st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
628
            
629
        dv_inject_video(c, data, *frame);
630
        c->has_video = 1;
631
        data_size = 0;
632
        if (c->has_audio < 0)
633
            goto out;
634
    } 
635
    
636
    reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);
637
    fsize = fifo_size(&c->audio_data, c->audio_data.rptr);
638
    if (st->codec.codec_type == CODEC_TYPE_AUDIO || (c->has_video && fsize >= reqasize)) { 
639
        if (fsize + data_size >= reqasize && !c->has_audio) {
640
            if (fsize >= reqasize) {
641
                fifo_read(&c->audio_data, &pcm[0], reqasize, &c->audio_data.rptr);
642
            } else {
643
                fifo_read(&c->audio_data, &pcm[0], fsize, &c->audio_data.rptr);
644
                memcpy(&pcm[fsize], &data[0], reqasize - fsize);
645
                data += reqasize - fsize;
646
                data_size -= reqasize - fsize;
647
            }
648
            dv_inject_audio(c, &pcm[0], *frame);
649
            c->has_audio = 1;
650
        }
651
    
652
        /* FIXME: we have to have more sensible approach than this one */
653
        if (fifo_size(&c->audio_data, c->audio_data.rptr) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE)
654
            av_log(&st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
655
        fifo_write(&c->audio_data, (uint8_t *)data, data_size, &c->audio_data.wptr);
656
    }
657

    
658
out:
659
    return (c->has_audio && c->has_video) ? c->sys->frame_size : 0;
660
}
661

    
662
DVMuxContext* dv_init_mux(AVFormatContext* s)
663
{
664
    DVMuxContext *c;
665
    AVStream *vst = NULL;
666
    AVStream *ast = NULL;
667
    int i;
668

    
669
    if (s->nb_streams > 2)
670
        return NULL;
671

    
672
    c = av_mallocz(sizeof(DVMuxContext));
673
    if (!c)
674
        return NULL;
675

    
676
    /* We have to sort out where audio and where video stream is */
677
    for (i=0; i<s->nb_streams; i++) {
678
         switch (s->streams[i]->codec.codec_type) {
679
         case CODEC_TYPE_VIDEO:
680
               vst = s->streams[i];
681
               break;
682
         case CODEC_TYPE_AUDIO:
683
               ast = s->streams[i];
684
               break;
685
         default:
686
               goto bail_out;
687
         }
688
    }
689
    
690
    /* Some checks -- DV format is very picky about its incoming streams */
691
    if (!vst || vst->codec.codec_id != CODEC_ID_DVVIDEO)
692
        goto bail_out;
693
    if (ast  && (ast->codec.codec_id != CODEC_ID_PCM_S16LE ||
694
                 ast->codec.sample_rate != 48000 ||
695
                 ast->codec.channels != 2))
696
        goto bail_out;
697
    c->sys = dv_codec_profile(&vst->codec);
698
    if (!c->sys)
699
        goto bail_out;
700
    
701
    /* Ok, everything seems to be in working order */
702
    c->frames = 0;
703
    c->has_audio = ast ? 0 : -1;
704
    c->has_video = 0;
705
    c->start_time = (time_t)s->timestamp;
706
    c->aspect = 0; /* 4:3 is the default */
707
    if ((int)(av_q2d(vst->codec.sample_aspect_ratio) * vst->codec.width / vst->codec.height * 10) == 17) /* 16:9 */ 
708
        c->aspect = 0x07;
709

    
710
    if (ast && fifo_init(&c->audio_data, 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0)
711
        goto bail_out;
712

    
713
    dv_format_frame(c, &c->frame_buf[0]);
714

    
715
    return c;
716
    
717
bail_out:
718
    av_free(c);
719
    return NULL;
720
}
721

    
722
void dv_delete_mux(DVMuxContext *c)
723
{    
724
    fifo_free(&c->audio_data);
725
}
726

    
727
DVDemuxContext* dv_init_demux(AVFormatContext *s)
728
{
729
    DVDemuxContext *c;
730

    
731
    c = av_mallocz(sizeof(DVDemuxContext));
732
    if (!c)
733
        return NULL;
734

    
735
    c->vst = av_new_stream(s, 0);
736
    if (!c->vst) {
737
        av_free(c);        
738
        return NULL;
739
    }
740
    av_set_pts_info(c->vst, 64, 1, 30000);
741

    
742
    c->fctx = s;
743
    c->ast[0] = c->ast[1] = NULL;
744
    c->ach = 0;
745
    c->frames = 0;
746
    c->abytes = 0;
747
    c->audio_pkt[0].size = 0;
748
    c->audio_pkt[1].size = 0;
749
    
750
    c->vst->codec.codec_type = CODEC_TYPE_VIDEO;
751
    c->vst->codec.codec_id = CODEC_ID_DVVIDEO;
752
    c->vst->codec.bit_rate = 25000000;
753
    c->vst->start_time = 0;
754
    
755
    return c;
756
}
757

    
758
static void __destruct_pkt(struct AVPacket *pkt)
759
{
760
    pkt->data = NULL; pkt->size = 0;
761
    return;
762
}
763

    
764
int dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
765
{
766
    int size = -1;
767
    int i;
768

    
769
    for (i=0; i<c->ach; i++) {
770
       if (c->ast[i] && c->audio_pkt[i].size) {
771
           *pkt = c->audio_pkt[i];
772
           c->audio_pkt[i].size = 0;
773
           size = pkt->size;
774
           break;
775
       }
776
    }
777

    
778
    return size;
779
}
780

    
781
int dv_produce_packet(DVDemuxContext *c, AVPacket *pkt, 
782
                      uint8_t* buf, int buf_size)
783
{
784
    int size, i;
785
    const DVprofile* sys = dv_frame_profile(buf);
786
   
787
    if (buf_size < 4 || buf_size < sys->frame_size)
788
        return -1;   /* Broken frame, or not enough data */
789

    
790
    /* Queueing audio packet */
791
    /* FIXME: in case of no audio/bad audio we have to do something */
792
    size = dv_extract_audio_info(c, buf);
793
    c->audio_pkt[0].data = c->audio_pkt[1].data = NULL;
794
    for (i=0; i<c->ach; i++) {
795
       if (av_new_packet(&c->audio_pkt[i], size) < 0)
796
           return AVERROR_NOMEM;
797
       c->audio_pkt[i].stream_index = c->ast[i]->index;
798
       c->audio_pkt[i].pts = c->abytes * 30000*8 / c->ast[i]->codec.bit_rate;
799
       c->audio_pkt[i].flags |= PKT_FLAG_KEY;
800
    }
801
    dv_extract_audio(buf, c->audio_pkt[0].data, c->audio_pkt[1].data);
802
    c->abytes += size;
803
    
804
    /* Now it's time to return video packet */
805
    size = dv_extract_video_info(c, buf);
806
    av_init_packet(pkt);
807
    pkt->destruct = __destruct_pkt;
808
    pkt->data     = buf;
809
    pkt->size     = size; 
810
    pkt->flags   |= PKT_FLAG_KEY;
811
    pkt->stream_index = c->vst->id;
812
    pkt->pts      = c->frames * sys->frame_rate_base * (30000/sys->frame_rate);
813
    
814
    c->frames++;
815

    
816
    return size;
817
}
818
                           
819
int64_t dv_frame_offset(DVDemuxContext *c, int64_t timestamp)
820
{
821
    const DVprofile* sys;
822
    int64_t frame_number, offset;
823
    
824
    // FIXME: sys may be wrong if last dv_read_packet() failed (buffer is junk)
825
    sys = dv_codec_profile(&c->vst->codec);
826

    
827
    // timestamp was scaled by time_base/AV_BASE_RATE by av_seek_frame()
828
    frame_number = (timestamp * sys->frame_rate) / 
829
                   ((int64_t) 30000 * sys->frame_rate_base);
830

    
831
    // offset must be a multiple of frame_size else dv_read_packet() will fail
832
    offset = (int64_t) sys->frame_size * frame_number;
833

    
834
    return offset;
835
}
836

    
837
/************************************************************
838
 * Implementation of the easiest DV storage of all -- raw DV.
839
 ************************************************************/
840
 
841
typedef struct RawDVContext {
842
    uint8_t         buf[144000];
843
    DVDemuxContext* dv_demux;
844
} RawDVContext;
845

    
846
static int dv_read_header(AVFormatContext *s,
847
                          AVFormatParameters *ap)
848
{
849
    RawDVContext *c = s->priv_data;
850
    const DVprofile* sys;
851
    c->dv_demux = dv_init_demux(s);
852
    if (!c->dv_demux)
853
        return -1;
854
   
855
    if (get_buffer(&s->pb, c->buf, 4) <= 0 || url_fseek(&s->pb, -4, SEEK_CUR) < 0)
856
        return AVERROR_IO;
857

    
858
    sys = dv_frame_profile(c->buf);
859
    s->bit_rate = av_rescale(sys->frame_size * 8, sys->frame_rate, sys->frame_rate_base);
860
   
861
    return 0;
862
}
863

    
864

    
865
static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
866
{
867
    int size;
868
    RawDVContext *c = s->priv_data; 
869
  
870
    size = dv_get_packet(c->dv_demux, pkt);
871
    
872
    if (size < 0) {
873
        if (get_buffer(&s->pb, c->buf, 4) <= 0) 
874
            return AVERROR_IO;
875
    
876
        size = dv_frame_profile(c->buf)->frame_size;
877
        if (get_buffer(&s->pb, c->buf + 4, size - 4) <= 0)
878
            return AVERROR_IO;
879

    
880
        size = dv_produce_packet(c->dv_demux, pkt, c->buf, size);
881
    } 
882
    
883
    return size;
884
}
885

    
886
static int dv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp)
887
{
888
    RawDVContext *c = s->priv_data;
889

    
890
    return url_fseek(&s->pb, dv_frame_offset(c->dv_demux, timestamp), SEEK_SET);
891
}
892

    
893
static int dv_read_close(AVFormatContext *s)
894
{
895
    RawDVContext *c = s->priv_data;
896
    av_free(c->dv_demux);
897
    return 0;
898
}
899

    
900
static int dv_write_header(AVFormatContext *s)
901
{
902
    s->priv_data = dv_init_mux(s);
903
    if (!s->priv_data) {
904
        av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
905
                    "Make sure that you supply exactly two streams:\n"
906
                    "     video: 25fps or 29.97fps, audio: 2ch/48Khz/PCM\n");
907
        return -1;
908
    }
909
    return 0;
910
}
911

    
912
static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
913
{
914
    uint8_t* frame;
915
    int fsize;
916
   
917
    fsize = dv_assemble_frame((DVMuxContext *)s->priv_data, s->streams[pkt->stream_index],
918
                              pkt->data, pkt->size, &frame);
919
    if (fsize > 0) {
920
        put_buffer(&s->pb, frame, fsize); 
921
        put_flush_packet(&s->pb);
922
    } 
923
    return 0;
924
}
925

    
926
/* 
927
 * We might end up with some extra A/V data without matching counterpart.
928
 * E.g. video data without enough audio to write the complete frame.
929
 * Currently we simply drop the last frame. I don't know whether this 
930
 * is the best strategy of all
931
 */
932
static int dv_write_trailer(struct AVFormatContext *s)
933
{
934
    dv_delete_mux((DVMuxContext *)s->priv_data);
935
    return 0;
936
}
937

    
938
static AVInputFormat dv_iformat = {
939
    "dv",
940
    "DV video format",
941
    sizeof(RawDVContext),
942
    NULL,
943
    dv_read_header,
944
    dv_read_packet,
945
    dv_read_close,
946
    dv_read_seek,
947
    .extensions = "dv,dif",
948
};
949

    
950
static AVOutputFormat dv_oformat = {
951
    "dv",
952
    "DV video format",
953
    NULL,
954
    "dv",
955
    sizeof(DVMuxContext),
956
    CODEC_ID_PCM_S16LE,
957
    CODEC_ID_DVVIDEO,
958
    dv_write_header,
959
    dv_write_packet,
960
    dv_write_trailer,
961
};
962

    
963
int ff_dv_init(void)
964
{
965
    av_register_input_format(&dv_iformat);
966
    av_register_output_format(&dv_oformat);
967
    return 0;
968
}