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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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typedef struct DVDemuxContext {
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    AVPacket  audio_pkt;
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    AVStream  *vst;
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    AVStream  *ast;
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} DVDemuxContext;
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typedef 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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} DVMuxContext;
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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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69

    
70

    
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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;
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    sample = (sample < 0x800) ? sample : sample | 0xf000;
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    shift = (sample & 0xf00) >> 8;
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149
    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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    }
158

    
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    return result;
160
}
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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)
169
{
170
    struct tm tc;
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    time_t ct;
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    int ltc_frame;
173

    
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    buf[0] = (uint8_t)pack_id;
175
    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;
190
    case dv_timecode:
191
          ct = (time_t)(c->frames / ((float)c->sys->frame_rate / 
192
                                     (float)c->sys->frame_rate_base));
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          localtime_r(&ct, &tc);
194
          /* 
195
           * LTC drop-frame frame counter drops two frames (0 and 1) every 
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           * minute, unless it is exactly divisible by 10
197
           */
198
          ltc_frame = (c->frames + 2*ct/60 - 2*ct/600) % c->sys->ltc_divisor;
199
          buf[1] = (0 << 7) | /* Color fame: 0 - unsync; 1 - sync mode */
200
                   (1 << 6) | /* Drop frame timecode: 0 - nondrop; 1 - drop */
201
                   ((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 */
213
          break;
214
    case dv_audio_source:  /* AAUX source pack */
215
          buf[1] = (0 << 7) | /* locked mode       */
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                   (1 << 6) | /* reserved -- always 1 */
217
                   (dv_audio_frame_size(c->sys, c->frames) -
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                    c->sys->audio_min_samples[0]);
219
                              /* # of samples      */
220
          buf[2] = (0 << 7) | /* multi-stereo      */
221
                   (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
222
                   (0 << 4) | /* pair bit: 0 -- one pair of channels */
223
                    0;        /* audio mode        */
224
          buf[3] = (1 << 7) | /* res               */
225
                   (1 << 6) | /* multi-language flag */
226
                   (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 */                            
232
          break;
233
    case dv_audio_control:
234
          buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
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                   (1 << 4) | /* input source: 1 -- digital input */
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                   (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 */
239
                   (1 << 6) | /* recording end point: 1 -- no */
240
                   (1 << 3) | /* recording mode: 1 -- original */
241
                    7;         
242
          buf[3] = (1 << 7) | /* direction: 1 -- forward */
243
                    0x20;     /* speed */
244
          buf[4] = (1 << 7) | /* reserved -- always 1 */
245
                    0x7f;     /* genre category */
246
          break;
247
    case dv_audio_recdate:
248
    case dv_viedo_recdate:  /* VAUX recording date */
249
          ct = c->start_time + (time_t)(c->frames / 
250
               ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
251
          localtime_r(&ct, &tc);
252
          buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
253
                         /* 0xff is very likely to be "unknown" */
254
          buf[2] = (3 << 6) | /* reserved -- always 1 */
255
                   ((tc.tm_mday / 10) << 4) | /* Tens of day */
256
                   (tc.tm_mday % 10);         /* Units of day */
257
          buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
258
                   (tc.tm_mon % 10);         /* Units of month */
259
          buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
260
                   (tc.tm_year % 10);                 /* Units of year */
261
          break;
262
    case dv_audio_rectime:  /* AAUX recording time */
263
    case dv_video_rectime:  /* VAUX recording time */
264
          ct = c->start_time + (time_t)(c->frames / 
265
               ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
266
          localtime_r(&ct, &tc);
267
          buf[1] = (3 << 6) | /* reserved -- always 1 */
268
                   0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
269
          buf[2] = (1 << 7) | /* reserved -- always 1 */ 
270
                   ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
271
                   (tc.tm_sec % 10);         /* Units of seconds */
272
          buf[3] = (1 << 7) | /* reserved -- always 1 */
273
                   ((tc.tm_min / 10) << 4) | /* Tens of minutes */
274
                   (tc.tm_min % 10);         /* Units of minutes */
275
          buf[4] = (3 << 6) | /* reserved -- always 1 */ 
276
                   ((tc.tm_hour / 10) << 4) | /* Tens of hours */
277
                   (tc.tm_hour % 10);         /* Units of hours */
278
          break;
279
    case dv_video_source:
280
          buf[1] = 0xff; /* reserved -- always 1 */
281
          buf[2] = (1 << 7) | /* B/W: 0 - b/w, 1 - color */
282
                   (1 << 6) | /* following CLF is valid - 0, invalid - 1 */
283
                   (3 << 4) | /* CLF: color frames id (see ITU-R BT.470-4) */
284
                   0xf; /* reserved -- always 1 */
285
          buf[3] = (3 << 6) | /* reserved -- always 1 */
286
                   (c->sys->dsf << 5) | /*  system: 60fields/50fields */
287
                   0; /* signal type video compression */
288
          buf[4] = 0xff; /* VISC: 0xff -- no information */
289
          break;
290
    case dv_video_control:
291
          buf[1] = (0 << 6) | /* Copy generation management (CGMS) 0 -- free */
292
                   0x3f; /* reserved -- always 1 */
293
          buf[2] = 0xc8 | /* reserved -- always b11001xxx */
294
                   c->aspect;
295
          buf[3] = (1 << 7) | /* Frame/field flag 1 -- frame, 0 -- field */
296
                   (1 << 6) | /* First/second field flag 0 -- field 2, 1 -- field 1 */
297
                   (1 << 5) | /* Frame change flag 0 -- same picture as before, 1 -- different */
298
                   (1 << 4) | /* 1 - interlaced, 0 - noninterlaced */
299
                   0xc; /* reserved -- always b1100 */
300
          buf[4] = 0xff; /* reserved -- always 1 */
301
          break;
302
    default:
303
          buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
304
    }
305
    return 5;
306
}
307

    
308
static inline int dv_write_dif_id(enum dv_section_type t, uint8_t seq_num, 
309
                                  uint8_t dif_num, uint8_t* buf)
310
{
311
    buf[0] = (uint8_t)t;    /* Section type */
312
    buf[1] = (seq_num<<4) | /* DIF seq number 0-9 for 525/60; 0-11 for 625/50 */
313
             (0 << 3) |     /* FSC: for 50Mb/s 0 - first channel; 1 - second */
314
             7;             /* reserved -- always 1 */
315
    buf[2] = dif_num;       /* DIF block number Video: 0-134, Audio: 0-8 */
316
    return 3;
317
}
318

    
319
static inline int dv_write_ssyb_id(uint8_t syb_num, uint8_t fr, uint8_t* buf)
320
{
321
    if (syb_num == 0 || syb_num == 6) {
322
        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
323
                 (0<<4)  | /* AP3 (Subcode application ID) */
324
                 0x0f;     /* reserved -- always 1 */
325
    } 
326
    else if (syb_num == 11) {
327
        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
328
                 0x7f;     /* reserved -- always 1 */
329
    }
330
    else {
331
        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
332
                 (0<<4)  | /* APT (Track application ID) */
333
                 0x0f;     /* reserved -- always 1 */
334
    }
335
    buf[1] = 0xf0 |            /* reserved -- always 1 */
336
             (syb_num & 0x0f); /* SSYB number 0 - 11   */
337
    buf[2] = 0xff;             /* reserved -- always 1 */
338
    return 3;
339
}
340

    
341
static void dv_format_frame(DVMuxContext *c, uint8_t* buf)
342
{
343
    int i, j, k;
344
    
345
    for (i = 0; i < c->sys->difseg_size; i++) {
346
       memset(buf, 0xff, 80 * 6); /* First 6 DIF blocks are for control data */
347
       
348
       /* DV header: 1DIF */
349
       buf += dv_write_dif_id(dv_sect_header, i, 0, buf);
350
       buf += dv_write_pack((c->sys->dsf ? dv_header625 : dv_header525), c, buf);
351
       buf += 72; /* unused bytes */
352
                                   
353
       /* DV subcode: 2DIFs */
354
       for (j = 0; j < 2; j++) {
355
          buf += dv_write_dif_id( dv_sect_subcode, i, j, buf);
356
          for (k = 0; k < 6; k++) {
357
             buf += dv_write_ssyb_id(k, (i < c->sys->difseg_size/2), buf);
358
             buf += dv_write_pack(dv_ssyb_packs_dist[i][k], c, buf);
359
          }
360
          buf += 29; /* unused bytes */
361
       }
362
       
363
       /* DV VAUX: 3DIFs */
364
       for (j = 0; j < 3; j++) {
365
          buf += dv_write_dif_id(dv_sect_vaux, i, j, buf);
366
          for (k = 0; k < 15 ; k++)
367
             buf += dv_write_pack(dv_vaux_packs_dist[i][k], c, buf);
368
          buf += 2; /* unused bytes */
369
       } 
370
       
371
       /* DV Audio/Video: 135 Video DIFs + 9 Audio DIFs */
372
       for (j = 0; j < 135; j++) {
373
            if (j%15 == 0) {
374
                buf += dv_write_dif_id(dv_sect_audio, i, j/15, buf);
375
                buf += dv_write_pack(dv_aaux_packs_dist[i][j/15], c, buf);
376
                buf += 72; /* shuffled PCM audio */
377
            }
378
            buf += dv_write_dif_id(dv_sect_video, i, j, buf);
379
            buf += 77; /* 1 video macro block: 1 bytes control
380
                                               4 * 14 bytes Y 8x8 data
381
                                                   10 bytes Cr 8x8 data
382
                                                   10 bytes Cb 8x8 data */
383
       }
384
    }
385
}
386

    
387
static void dv_inject_audio(DVMuxContext *c, const uint8_t* pcm, uint8_t* frame_ptr)
388
{
389
    int i, j, d, of;
390
    for (i = 0; i < c->sys->difseg_size; i++) {
391
       frame_ptr += 6 * 80; /* skip DIF segment header */
392
       for (j = 0; j < 9; j++) {
393
          for (d = 8; d < 80; d+=2) {
394
             of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
395
             frame_ptr[d] = pcm[of*2+1]; // FIXME: may be we have to admit
396
             frame_ptr[d+1] = pcm[of*2]; //        that DV is a big endian PCM       
397
          }
398
          frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
399
       }
400
    }
401
}
402

    
403
static void dv_inject_video(DVMuxContext *c, const uint8_t* video_data, uint8_t* frame_ptr)
404
{
405
    int i, j;
406
    int ptr = 0;
407

    
408
    for (i = 0; i < c->sys->difseg_size; i++) {
409
       ptr += 6 * 80; /* skip DIF segment header */
410
       for (j = 0; j < 135; j++) {
411
            if (j%15 == 0)
412
                ptr += 80; /* skip Audio DIF */
413
            ptr += 3;
414
            memcpy(frame_ptr + ptr, video_data + ptr, 77);
415
            ptr += 77;
416
       }
417
    }
418
}
419

    
420
/* 
421
 * This is the dumbest implementation of all -- it simply looks at
422
 * a fixed offset and if pack isn't there -- fails. We might want
423
 * to have a fallback mechanism for complete search of missing packs.
424
 */
425
static const uint8_t* dv_extract_pack(uint8_t* frame, enum dv_pack_type t)
426
{
427
    int offs;
428
    
429
    switch (t) {
430
    case dv_audio_source:
431
          offs = (80*6 + 80*16*3 + 3);
432
          break;
433
    case dv_audio_control:
434
          offs = (80*6 + 80*16*4 + 3);
435
          break;
436
    case dv_video_control:
437
          offs = (80*5 + 48 + 5);
438
          break;
439
    default:
440
          return NULL;
441
    }   
442

    
443
    return (frame[offs] == t ? &frame[offs] : NULL);
444
}
445

    
446
/* 
447
 * There's a couple of assumptions being made here:
448
 * 1. By default we silence erroneous (0x8000/16bit 0x800/12bit) audio samples.
449
 *    We can pass them upwards when ffmpeg will be ready to deal with them.
450
 * 2. We don't do software emphasis.
451
 * 3. Audio is always returned as 16bit linear samples: 12bit nonlinear samples
452
 *    are converted into 16bit linear ones.
453
 */
454
static int dv_extract_audio(uint8_t* frame, uint8_t* pcm)
455
{
456
    int size, i, j, d, of, smpls, freq, quant;
457
    uint16_t lc, rc;
458
    const DVprofile* sys;
459
    const uint8_t* as_pack;
460
    
461
    as_pack = dv_extract_pack(frame, dv_audio_source);
462
    if (!as_pack)    /* No audio ? */
463
        return 0;
464
   
465
    sys = dv_frame_profile(frame);
466
    smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
467
    freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
468
    quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
469
    
470
    if (quant > 1)
471
        return -1; /* Unsupported quantization */
472

    
473
    size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
474

    
475
    /* for each DIF segment */
476
    for (i = 0; i < sys->difseg_size; i++) {
477
       frame += 6 * 80; /* skip DIF segment header */
478
       for (j = 0; j < 9; j++) {
479
          for (d = 8; d < 80; d += 2) {
480
             if (quant == 0) {  /* 16bit quantization */
481
                 of = sys->audio_shuffle[i][j] + (d - 8)/2 * sys->audio_stride;
482
                 if (of*2 >= size)
483
                     continue;
484
                 
485
                 pcm[of*2] = frame[d+1]; // FIXME: may be we have to admit
486
                 pcm[of*2+1] = frame[d]; //        that DV is a big endian PCM
487
                 if (pcm[of*2+1] == 0x80 && pcm[of*2] == 0x00)
488
                     pcm[of*2+1] = 0;
489
              } else {           /* 12bit quantization */
490
                 if (i >= sys->difseg_size/2)
491
                     goto out;  /* We're not doing 4ch at this time */
492
                       
493
                 lc = ((uint16_t)frame[d] << 4) | 
494
                      ((uint16_t)frame[d+2] >> 4);
495
                 rc = ((uint16_t)frame[d+1] << 4) |
496
                      ((uint16_t)frame[d+2] & 0x0f);
497
                 lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
498
                 rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
499

    
500
                 of = sys->audio_shuffle[i][j] + (d - 8)/3 * sys->audio_stride;
501
                 if (of*2 >= size)
502
                     continue;
503

    
504
                 pcm[of*2] = lc & 0xff; // FIXME: may be we have to admit
505
                 pcm[of*2+1] = lc >> 8; //        that DV is a big endian PCM
506
                 of = sys->audio_shuffle[i+sys->difseg_size/2][j] + 
507
                      (d - 8)/3 * sys->audio_stride;
508
                 pcm[of*2] = rc & 0xff; // FIXME: may be we have to admit
509
                 pcm[of*2+1] = rc >> 8; //        that DV is a big endian PCM
510
                 ++d;
511
              }
512
          }
513
                
514
          frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
515
        }
516
    }
517

    
518
out:
519
    return size;
520
}
521

    
522
static int dv_extract_audio_info(uint8_t* frame, AVCodecContext* avctx)
523
{
524
    const uint8_t* as_pack;
525
    const DVprofile* sys;
526
    int freq, smpls;
527

    
528
    sys = dv_frame_profile(frame);
529
    as_pack = dv_extract_pack(frame, dv_audio_source);
530
    if (!as_pack || !sys)    /* No audio ? */
531
        return -1;
532
    
533
    smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
534
    freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
535
   
536
    avctx->sample_rate = dv_audio_frequency[freq];
537
    avctx->channels = 2;
538
    avctx->bit_rate = avctx->channels * avctx->sample_rate * 16;
539

    
540
    return (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */;
541
}
542

    
543
static int dv_extract_video_info(uint8_t* frame, AVCodecContext* avctx)
544
{
545
    const DVprofile* sys; 
546
    const uint8_t* vsc_pack;
547
    int apt;
548
    int size = 0;
549
    
550
    sys = dv_frame_profile(frame);
551
    if (sys) {
552
        apt = frame[4] & 0x07;
553
        avctx->frame_rate = sys->frame_rate;
554
        avctx->frame_rate_base = sys->frame_rate_base;
555
        avctx->width = sys->width;
556
        avctx->height = sys->height;
557
        avctx->pix_fmt = sys->pix_fmt;
558
        vsc_pack = dv_extract_pack(frame, dv_video_control);
559
        if (vsc_pack && (vsc_pack[2] & 0x07) == (apt?0x02:0x07))
560
            avctx->aspect_ratio = 16.0 / 9.0;
561
        else
562
            avctx->aspect_ratio = 4.0 / 3.0;
563
        size = sys->frame_size;
564
    }
565
    return size;
566
}
567

    
568
/* 
569
 * The following 6 functions constitute our interface to the world
570
 */
571

    
572
int dv_assemble_frame(DVMuxContext *c, AVStream* st,
573
                      const uint8_t* data, int data_size, uint8_t** frame)
574
{
575
    uint8_t pcm[8192];
576
    int fsize, reqasize;
577
   
578
    *frame = &c->frame_buf[0];
579
    if (c->has_audio && c->has_video) {  /* must be a stale frame */
580
        dv_format_frame(c, *frame);
581
        c->frames++;
582
        c->has_audio = c->has_video = 0;
583
    }
584
    
585
    if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
586
        /* FIXME: we have to have more sensible approach than this one */
587
        if (c->has_video)
588
            fprintf(stderr, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
589
            
590
        dv_inject_video(c, data, *frame);
591
        c->has_video = 1;
592
        data_size = 0;
593
    } 
594
    
595
    reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);
596
    fsize = fifo_size(&c->audio_data, c->audio_data.rptr);
597
    if (st->codec.codec_type == CODEC_TYPE_AUDIO || (c->has_video && fsize >= reqasize)) { 
598
        if (fsize + data_size >= reqasize && !c->has_audio) {
599
            if (fsize >= reqasize) {
600
                fifo_read(&c->audio_data, &pcm[0], reqasize, &c->audio_data.rptr);
601
            } else {
602
                fifo_read(&c->audio_data, &pcm[0], fsize, &c->audio_data.rptr);
603
                memcpy(&pcm[fsize], &data[0], reqasize - fsize);
604
                data += reqasize - fsize;
605
                data_size -= reqasize - fsize;
606
            }
607
            dv_inject_audio(c, &pcm[0], *frame);
608
            c->has_audio = 1;
609
        }
610
    
611
        /* FIXME: we have to have more sensible approach than this one */
612
        if (fifo_size(&c->audio_data, c->audio_data.rptr) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE)
613
            fprintf(stderr, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
614
        fifo_write(&c->audio_data, (uint8_t *)data, data_size, &c->audio_data.wptr);
615
    }
616

    
617
    return (c->has_audio && c->has_video) ? c->sys->frame_size : 0;
618
}
619

    
620
DVMuxContext* dv_init_mux(AVFormatContext* s)
621
{
622
    DVMuxContext *c;
623
    AVStream *vst;
624
    AVStream *ast;
625

    
626
    c = av_mallocz(sizeof(DVMuxContext));
627
    if (!c)
628
        return NULL;
629

    
630
    if (s->nb_streams != 2)
631
        goto bail_out;
632

    
633
    /* We have to sort out where audio and where video stream is */
634
    if (s->streams[0]->codec.codec_type == CODEC_TYPE_VIDEO &&
635
        s->streams[1]->codec.codec_type == CODEC_TYPE_AUDIO) {
636
       vst = s->streams[0];
637
       ast = s->streams[1];
638
    }
639
    else if (s->streams[1]->codec.codec_type == CODEC_TYPE_VIDEO &&
640
             s->streams[0]->codec.codec_type == CODEC_TYPE_AUDIO) {
641
           vst = s->streams[1];
642
           ast = s->streams[0];
643
    } else
644
        goto bail_out;
645
  
646
    /* Some checks -- DV format is very picky about its incoming streams */
647
    if (vst->codec.codec_id != CODEC_ID_DVVIDEO ||
648
        ast->codec.codec_id != CODEC_ID_PCM_S16LE)
649
       goto bail_out;
650
    if (ast->codec.sample_rate != 48000 ||
651
        ast->codec.channels != 2)
652
       goto bail_out;
653

    
654
    c->sys = dv_codec_profile(&vst->codec);
655
    if (!c->sys)
656
        goto bail_out;
657
    
658
    /* Ok, everything seems to be in working order */
659
    c->frames = 0;
660
    c->has_audio = c->has_video = 0;
661
    c->start_time = time(NULL);
662
    c->aspect = 0; /* 4:3 is the default */
663
    if (vst->codec.aspect_ratio == 16.0 / 9.0)
664
        c->aspect = 0x07;
665

    
666
    if (fifo_init(&c->audio_data, 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0)
667
        goto bail_out;
668

    
669
    dv_format_frame(c, &c->frame_buf[0]);
670

    
671
    return c;
672
    
673
bail_out:
674
    av_free(c);
675
    return NULL;
676
}
677

    
678
void dv_delete_mux(DVMuxContext *c)
679
{    
680
    fifo_free(&c->audio_data);
681
    av_free(c);
682
}
683

    
684
DVDemuxContext* dv_init_demux(AVFormatContext *s, int vid, int aid)
685
{
686
    DVDemuxContext *c;
687

    
688
    c = av_mallocz(sizeof(DVDemuxContext));
689
    if (!c)
690
        return NULL;
691

    
692
    c->vst = (vid < s->nb_streams) ? s->streams[vid] : av_new_stream(s, vid);
693
    c->ast = (aid < s->nb_streams) ? s->streams[aid] : av_new_stream(s, aid);
694
    if (!c->vst || !c->ast)
695
        goto fail;
696
        
697
    c->vst->codec.codec_type = CODEC_TYPE_VIDEO;
698
    c->vst->codec.codec_id = CODEC_ID_DVVIDEO;
699
    c->vst->codec.bit_rate = 25000000;
700
    
701
    c->ast->codec.codec_type = CODEC_TYPE_AUDIO;
702
    c->ast->codec.codec_id = CODEC_ID_PCM_S16LE;
703
    
704
    c->audio_pkt.size = 0;
705
    
706
    return c;
707
    
708
fail:
709
    if (c->vst)
710
        av_free(c->vst);
711
    if (c->ast)
712
        av_free(c->ast);
713
    av_free(c);
714
    return NULL;
715
}
716

    
717
static void __destruct_pkt(struct AVPacket *pkt)
718
{
719
    pkt->data = NULL; pkt->size = 0;
720
    return;
721
}
722

    
723
int dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
724
{
725
    int size = -1;
726

    
727
    if (c->audio_pkt.size) {
728
        *pkt = c->audio_pkt;
729
        c->audio_pkt.size = 0;
730
        size = pkt->size;
731
    }
732

    
733
    return size;
734
}
735

    
736
int dv_produce_packet(DVDemuxContext *c, AVPacket *pkt, 
737
                      uint8_t* buf, int buf_size)
738
{
739
    int size;
740
   
741
    if (buf_size < 4 || buf_size < dv_frame_profile(buf)->frame_size)
742
        return -1;   /* Broken frame, or not enough data */
743

    
744
    /* Queueing audio packet */
745
    /* FIXME: in case of no audio/bad audio we have to do something */
746
    size = dv_extract_audio_info(buf, &c->ast->codec);
747
    if (av_new_packet(&c->audio_pkt, size) < 0)
748
        return AVERROR_NOMEM;
749
    dv_extract_audio(buf, c->audio_pkt.data);
750
    c->audio_pkt.size = size;
751
    c->audio_pkt.stream_index = c->ast->id;
752
    
753
    /* Now it's time to return video packet */
754
    size = dv_extract_video_info(buf, &c->vst->codec);
755
    av_init_packet(pkt);
756
    pkt->destruct = __destruct_pkt;
757
    pkt->data     = buf;
758
    pkt->size     = size; 
759
    pkt->flags   |= PKT_FLAG_KEY;
760
    pkt->stream_index = c->vst->id;
761
    
762
    return size;
763
}
764
                           
765
/************************************************************
766
 * Implementation of the easiest DV storage of all -- raw DV.
767
 ************************************************************/
768
 
769
typedef struct RawDVContext {
770
    void*     dv_demux;
771
    uint8_t   buf[144000];
772
} RawDVContext;
773

    
774
static int dv_read_header(AVFormatContext *s,
775
                          AVFormatParameters *ap)
776
{
777
    RawDVContext *c = s->priv_data;
778
    c->dv_demux = dv_init_demux(s, 0, 1);
779
   
780
    return c->dv_demux ? 0 : -1;
781
}
782

    
783

    
784
static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
785
{
786
    int size;
787
    RawDVContext *c = s->priv_data; 
788
  
789
    size = dv_get_packet(c->dv_demux, pkt);
790
    
791
    if (size < 0) {
792
        if (get_buffer(&s->pb, c->buf, 4) <= 0) 
793
            return -EIO;
794
    
795
        size = dv_frame_profile(c->buf)->frame_size;
796
        if (get_buffer(&s->pb, c->buf + 4, size - 4) <= 0)
797
            return -EIO;
798

    
799
        size = dv_produce_packet(c->dv_demux, pkt, c->buf, size);
800
    } 
801
    
802
    return size;
803
}
804

    
805
static int dv_read_close(AVFormatContext *s)
806
{
807
    RawDVContext *c = s->priv_data;
808
    av_free(c->dv_demux);
809
    return 0;
810
}
811

    
812
static int dv_write_header(AVFormatContext *s)
813
{
814
    s->priv_data = dv_init_mux(s);
815
    if (!s->priv_data) {
816
        fprintf(stderr, "Can't initialize DV format!\n"
817
                    "Make sure that you supply exactly two streams:\n"
818
                    "     video: 25fps or 29.97fps, audio: 2ch/48Khz/PCM\n");
819
        return -1;
820
    }
821
    return 0;
822
}
823

    
824
static int dv_write_packet(struct AVFormatContext *s, 
825
                           int stream_index,
826
                           const uint8_t *buf, int size, int64_t pts)
827
{
828
    uint8_t* frame;
829
    int fsize;
830
   
831
    fsize = dv_assemble_frame((DVMuxContext *)s->priv_data, s->streams[stream_index],
832
                              buf, size, &frame);
833
    if (fsize > 0) {
834
        put_buffer(&s->pb, frame, fsize); 
835
        put_flush_packet(&s->pb);
836
    } 
837
    return fsize;
838
}
839

    
840
/* 
841
 * We might end up with some extra A/V data without matching counterpart.
842
 * E.g. video data without enough audio to write the complete frame.
843
 * Currently we simply drop the last frame. I don't know whether this 
844
 * is the best strategy of all
845
 */
846
static int dv_write_trailer(struct AVFormatContext *s)
847
{
848
    dv_delete_mux((DVMuxContext *)s->priv_data);
849
    return 0;
850
}
851

    
852
static AVInputFormat dv_iformat = {
853
    "dv",
854
    "DV video format",
855
    sizeof(RawDVContext),
856
    NULL,
857
    dv_read_header,
858
    dv_read_packet,
859
    dv_read_close,
860
    .extensions = "dv",
861
};
862

    
863
static AVOutputFormat dv_oformat = {
864
    "dv",
865
    "DV video format",
866
    NULL,
867
    "dv",
868
    sizeof(DVMuxContext),
869
    CODEC_ID_PCM_S16LE,
870
    CODEC_ID_DVVIDEO,
871
    dv_write_header,
872
    dv_write_packet,
873
    dv_write_trailer,
874
};
875

    
876
int dv_init(void)
877
{
878
    av_register_input_format(&dv_iformat);
879
    av_register_output_format(&dv_oformat);
880
    return 0;
881
}