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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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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    uint8_t          audio_buf[2][8192];
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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_video_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;
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    sample = (sample < 0x800) ? sample : sample | 0xf000;
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    shift = (sample & 0xf00) >> 8;
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    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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    }
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    return result;
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}
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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)
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{
176
    struct tm tc;
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    time_t ct;
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    int ltc_frame;
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    buf[0] = (uint8_t)pack_id;
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    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;
196
    case dv_timecode:
197
          ct = (time_t)(c->frames / ((float)c->sys->frame_rate /
198
                                     (float)c->sys->frame_rate_base));
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          brktimegm(ct, &tc);
200
          /*
201
           * LTC drop-frame frame counter drops two frames (0 and 1) every
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           * minute, unless it is exactly divisible by 10
203
           */
204
          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]);
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                              /* # 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 */
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                   (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 */
238
          break;
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    case dv_audio_control:
240
          buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
241
                   (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 */
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                   (1 << 6) | /* recording end point: 1 -- no */
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                   (1 << 3) | /* recording mode: 1 -- original */
247
                    7;
248
          buf[3] = (1 << 7) | /* direction: 1 -- forward */
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                    0x20;     /* speed */
250
          buf[4] = (1 << 7) | /* reserved -- always 1 */
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                    0x7f;     /* genre category */
252
          break;
253
    case dv_audio_recdate:
254
    case dv_video_recdate:  /* VAUX recording date */
255
          ct = c->start_time + (time_t)(c->frames /
256
               ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
257
          brktimegm(ct, &tc);
258
          buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
259
                         /* 0xff is very likely to be "unknown" */
260
          buf[2] = (3 << 6) | /* reserved -- always 1 */
261
                   ((tc.tm_mday / 10) << 4) | /* Tens of day */
262
                   (tc.tm_mday % 10);         /* Units of day */
263
          buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
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                   ((tc.tm_mon / 10) << 4) |    /* Tens of month */
265
                   (tc.tm_mon  % 10);           /* Units of month */
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          buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
267
                   (tc.tm_year % 10);                 /* Units of year */
268
          break;
269
    case dv_audio_rectime:  /* AAUX recording time */
270
    case dv_video_rectime:  /* VAUX recording time */
271
          ct = c->start_time + (time_t)(c->frames /
272
               ((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
273
          brktimegm(ct, &tc);
274
          buf[1] = (3 << 6) | /* reserved -- always 1 */
275
                   0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
276
          buf[2] = (1 << 7) | /* reserved -- always 1 */
277
                   ((tc.tm_sec / 10) << 4) | /* Tens of seconds */
278
                   (tc.tm_sec % 10);         /* Units of seconds */
279
          buf[3] = (1 << 7) | /* reserved -- always 1 */
280
                   ((tc.tm_min / 10) << 4) | /* Tens of minutes */
281
                   (tc.tm_min % 10);         /* Units of minutes */
282
          buf[4] = (3 << 6) | /* reserved -- always 1 */
283
                   ((tc.tm_hour / 10) << 4) | /* Tens of hours */
284
                   (tc.tm_hour % 10);         /* Units of hours */
285
          break;
286
    case dv_video_source:
287
          buf[1] = 0xff; /* reserved -- always 1 */
288
          buf[2] = (1 << 7) | /* B/W: 0 - b/w, 1 - color */
289
                   (1 << 6) | /* following CLF is valid - 0, invalid - 1 */
290
                   (3 << 4) | /* CLF: color frames id (see ITU-R BT.470-4) */
291
                   0xf; /* reserved -- always 1 */
292
          buf[3] = (3 << 6) | /* reserved -- always 1 */
293
                   (c->sys->dsf << 5) | /*  system: 60fields/50fields */
294
                   0; /* signal type video compression */
295
          buf[4] = 0xff; /* VISC: 0xff -- no information */
296
          break;
297
    case dv_video_control:
298
          buf[1] = (0 << 6) | /* Copy generation management (CGMS) 0 -- free */
299
                   0x3f; /* reserved -- always 1 */
300
          buf[2] = 0xc8 | /* reserved -- always b11001xxx */
301
                   c->aspect;
302
          buf[3] = (1 << 7) | /* Frame/field flag 1 -- frame, 0 -- field */
303
                   (1 << 6) | /* First/second field flag 0 -- field 2, 1 -- field 1 */
304
                   (1 << 5) | /* Frame change flag 0 -- same picture as before, 1 -- different */
305
                   (1 << 4) | /* 1 - interlaced, 0 - noninterlaced */
306
                   0xc; /* reserved -- always b1100 */
307
          buf[4] = 0xff; /* reserved -- always 1 */
308
          break;
309
    default:
310
          buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
311
    }
312
    return 5;
313
}
314

    
315
static inline int dv_write_dif_id(enum dv_section_type t, uint8_t seq_num,
316
                                  uint8_t dif_num, uint8_t* buf)
317
{
318
    buf[0] = (uint8_t)t;    /* Section type */
319
    buf[1] = (seq_num<<4) | /* DIF seq number 0-9 for 525/60; 0-11 for 625/50 */
320
             (0 << 3) |     /* FSC: for 50Mb/s 0 - first channel; 1 - second */
321
             7;             /* reserved -- always 1 */
322
    buf[2] = dif_num;       /* DIF block number Video: 0-134, Audio: 0-8 */
323
    return 3;
324
}
325

    
326
static inline int dv_write_ssyb_id(uint8_t syb_num, uint8_t fr, uint8_t* buf)
327
{
328
    if (syb_num == 0 || syb_num == 6) {
329
        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
330
                 (0<<4)  | /* AP3 (Subcode application ID) */
331
                 0x0f;     /* reserved -- always 1 */
332
    }
333
    else if (syb_num == 11) {
334
        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
335
                 0x7f;     /* reserved -- always 1 */
336
    }
337
    else {
338
        buf[0] = (fr<<7) | /* FR ID 1 - first half of each channel; 0 - second */
339
                 (0<<4)  | /* APT (Track application ID) */
340
                 0x0f;     /* reserved -- always 1 */
341
    }
342
    buf[1] = 0xf0 |            /* reserved -- always 1 */
343
             (syb_num & 0x0f); /* SSYB number 0 - 11   */
344
    buf[2] = 0xff;             /* reserved -- always 1 */
345
    return 3;
346
}
347

    
348
static void dv_format_frame(DVMuxContext *c, uint8_t* buf)
349
{
350
    int i, j, k;
351

    
352
    for (i = 0; i < c->sys->difseg_size; i++) {
353
       memset(buf, 0xff, 80 * 6); /* First 6 DIF blocks are for control data */
354

    
355
       /* DV header: 1DIF */
356
       buf += dv_write_dif_id(dv_sect_header, i, 0, buf);
357
       buf += dv_write_pack((c->sys->dsf ? dv_header625 : dv_header525), c, buf);
358
       buf += 72; /* unused bytes */
359

    
360
       /* DV subcode: 2DIFs */
361
       for (j = 0; j < 2; j++) {
362
          buf += dv_write_dif_id( dv_sect_subcode, i, j, buf);
363
          for (k = 0; k < 6; k++) {
364
             buf += dv_write_ssyb_id(k, (i < c->sys->difseg_size/2), buf);
365
             buf += dv_write_pack(dv_ssyb_packs_dist[i][k], c, buf);
366
          }
367
          buf += 29; /* unused bytes */
368
       }
369

    
370
       /* DV VAUX: 3DIFs */
371
       for (j = 0; j < 3; j++) {
372
          buf += dv_write_dif_id(dv_sect_vaux, i, j, buf);
373
          for (k = 0; k < 15 ; k++)
374
             buf += dv_write_pack(dv_vaux_packs_dist[i][k], c, buf);
375
          buf += 2; /* unused bytes */
376
       }
377

    
378
       /* DV Audio/Video: 135 Video DIFs + 9 Audio DIFs */
379
       for (j = 0; j < 135; j++) {
380
            if (j%15 == 0) {
381
                memset(buf, 0xff, 80);
382
                buf += dv_write_dif_id(dv_sect_audio, i, j/15, buf);
383
                buf += 77; /* audio control & shuffled PCM audio */
384
            }
385
            buf += dv_write_dif_id(dv_sect_video, i, j, buf);
386
            buf += 77; /* 1 video macro block: 1 bytes control
387
                                               4 * 14 bytes Y 8x8 data
388
                                                   10 bytes Cr 8x8 data
389
                                                   10 bytes Cb 8x8 data */
390
       }
391
    }
392
}
393

    
394
static void dv_inject_audio(DVMuxContext *c, const uint8_t* pcm, uint8_t* frame_ptr)
395
{
396
    int i, j, d, of, size;
397
    size = 4 * dv_audio_frame_size(c->sys, c->frames);
398
    for (i = 0; i < c->sys->difseg_size; i++) {
399
       frame_ptr += 6 * 80; /* skip DIF segment header */
400
       for (j = 0; j < 9; j++) {
401
          dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3]);
402
          for (d = 8; d < 80; d+=2) {
403
             of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
404
             if (of*2 >= size)
405
                 continue;
406

    
407
             frame_ptr[d] = pcm[of*2+1]; // FIXME: may be we have to admit
408
             frame_ptr[d+1] = pcm[of*2]; //        that DV is a big endian PCM
409
          }
410
          frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
411
       }
412
    }
413
}
414

    
415
static void dv_inject_video(DVMuxContext *c, const uint8_t* video_data, uint8_t* frame_ptr)
416
{
417
    int i, j;
418
    int ptr = 0;
419

    
420
    for (i = 0; i < c->sys->difseg_size; i++) {
421
       ptr += 6 * 80; /* skip DIF segment header */
422
       for (j = 0; j < 135; j++) {
423
            if (j%15 == 0)
424
                ptr += 80; /* skip Audio DIF */
425
            ptr += 3;
426
            memcpy(frame_ptr + ptr, video_data + ptr, 77);
427
            ptr += 77;
428
       }
429
    }
430
}
431

    
432
/*
433
 * This is the dumbest implementation of all -- it simply looks at
434
 * a fixed offset and if pack isn't there -- fails. We might want
435
 * to have a fallback mechanism for complete search of missing packs.
436
 */
437
static const uint8_t* dv_extract_pack(uint8_t* frame, enum dv_pack_type t)
438
{
439
    int offs;
440

    
441
    switch (t) {
442
    case dv_audio_source:
443
          offs = (80*6 + 80*16*3 + 3);
444
          break;
445
    case dv_audio_control:
446
          offs = (80*6 + 80*16*4 + 3);
447
          break;
448
    case dv_video_control:
449
          offs = (80*5 + 48 + 5);
450
          break;
451
    default:
452
          return NULL;
453
    }
454

    
455
    return (frame[offs] == t ? &frame[offs] : NULL);
456
}
457

    
458
/*
459
 * There's a couple of assumptions being made here:
460
 * 1. By default we silence erroneous (0x8000/16bit 0x800/12bit) audio samples.
461
 *    We can pass them upwards when ffmpeg will be ready to deal with them.
462
 * 2. We don't do software emphasis.
463
 * 3. Audio is always returned as 16bit linear samples: 12bit nonlinear samples
464
 *    are converted into 16bit linear ones.
465
 */
466
static int dv_extract_audio(uint8_t* frame, uint8_t* pcm, uint8_t* pcm2)
467
{
468
    int size, i, j, d, of, smpls, freq, quant, half_ch;
469
    uint16_t lc, rc;
470
    const DVprofile* sys;
471
    const uint8_t* as_pack;
472

    
473
    as_pack = dv_extract_pack(frame, dv_audio_source);
474
    if (!as_pack)    /* No audio ? */
475
        return 0;
476

    
477
    sys = dv_frame_profile(frame);
478
    smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
479
    freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
480
    quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
481

    
482
    if (quant > 1)
483
        return -1; /* Unsupported quantization */
484

    
485
    size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
486
    half_ch = sys->difseg_size/2;
487

    
488
    /* for each DIF segment */
489
    for (i = 0; i < sys->difseg_size; i++) {
490
       frame += 6 * 80; /* skip DIF segment header */
491
       if (quant == 1 && i == half_ch) {
492
           if (!pcm2)
493
               break;
494
           else
495
               pcm = pcm2;
496
       }
497

    
498
       for (j = 0; j < 9; j++) {
499
          for (d = 8; d < 80; d += 2) {
500
             if (quant == 0) {  /* 16bit quantization */
501
                 of = sys->audio_shuffle[i][j] + (d - 8)/2 * sys->audio_stride;
502
                 if (of*2 >= size)
503
                     continue;
504

    
505
                 pcm[of*2] = frame[d+1]; // FIXME: may be we have to admit
506
                 pcm[of*2+1] = frame[d]; //        that DV is a big endian PCM
507
                 if (pcm[of*2+1] == 0x80 && pcm[of*2] == 0x00)
508
                     pcm[of*2+1] = 0;
509
              } else {           /* 12bit quantization */
510
                 lc = ((uint16_t)frame[d] << 4) |
511
                      ((uint16_t)frame[d+2] >> 4);
512
                 rc = ((uint16_t)frame[d+1] << 4) |
513
                      ((uint16_t)frame[d+2] & 0x0f);
514
                 lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
515
                 rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
516

    
517
                 of = sys->audio_shuffle[i%half_ch][j] + (d - 8)/3 * sys->audio_stride;
518
                 if (of*2 >= size)
519
                     continue;
520

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

    
531
          frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
532
        }
533
    }
534

    
535
    return size;
536
}
537

    
538
static int dv_extract_audio_info(DVDemuxContext* c, uint8_t* frame)
539
{
540
    const uint8_t* as_pack;
541
    const DVprofile* sys;
542
    int freq, smpls, quant, i, ach;
543

    
544
    sys = dv_frame_profile(frame);
545
    as_pack = dv_extract_pack(frame, dv_audio_source);
546
    if (!as_pack || !sys) {    /* No audio ? */
547
        c->ach = 0;
548
        return 0;
549
    }
550

    
551
    smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
552
    freq = (as_pack[4] >> 3) & 0x07; /* 0 - 48KHz, 1 - 44,1kHz, 2 - 32 kHz */
553
    quant = as_pack[4] & 0x07; /* 0 - 16bit linear, 1 - 12bit nonlinear */
554
    ach = (quant && freq == 2) ? 2 : 1;
555

    
556
    /* Dynamic handling of the audio streams in DV */
557
    for (i=0; i<ach; i++) {
558
       if (!c->ast[i]) {
559
           c->ast[i] = av_new_stream(c->fctx, 0);
560
           if (!c->ast[i])
561
               break;
562
           av_set_pts_info(c->ast[i], 64, 1, 30000);
563
           c->ast[i]->codec->codec_type = CODEC_TYPE_AUDIO;
564
           c->ast[i]->codec->codec_id = CODEC_ID_PCM_S16LE;
565

    
566
           av_init_packet(&c->audio_pkt[i]);
567
           c->audio_pkt[i].size     = 0;
568
           c->audio_pkt[i].data     = c->audio_buf[i];
569
           c->audio_pkt[i].stream_index = c->ast[i]->index;
570
           c->audio_pkt[i].flags |= PKT_FLAG_KEY;
571
       }
572
       c->ast[i]->codec->sample_rate = dv_audio_frequency[freq];
573
       c->ast[i]->codec->channels = 2;
574
       c->ast[i]->codec->bit_rate = 2 * dv_audio_frequency[freq] * 16;
575
       c->ast[i]->start_time = 0;
576
    }
577
    c->ach = i;
578

    
579
    return (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */;
580
}
581

    
582
static int dv_extract_video_info(DVDemuxContext *c, uint8_t* frame)
583
{
584
    const DVprofile* sys;
585
    const uint8_t* vsc_pack;
586
    AVCodecContext* avctx;
587
    int apt, is16_9;
588
    int size = 0;
589

    
590
    sys = dv_frame_profile(frame);
591
    if (sys) {
592
        avctx = c->vst->codec;
593

    
594
        av_set_pts_info(c->vst, 64, sys->frame_rate_base, sys->frame_rate);
595
        avctx->time_base= (AVRational){sys->frame_rate_base, sys->frame_rate};
596
        if(!avctx->width){
597
            avctx->width = sys->width;
598
            avctx->height = sys->height;
599
        }
600
        avctx->pix_fmt = sys->pix_fmt;
601

    
602
        /* finding out SAR is a little bit messy */
603
        vsc_pack = dv_extract_pack(frame, dv_video_control);
604
        apt = frame[4] & 0x07;
605
        is16_9 = (vsc_pack && ((vsc_pack[2] & 0x07) == 0x02 ||
606
                               (!apt && (vsc_pack[2] & 0x07) == 0x07)));
607
        avctx->sample_aspect_ratio = sys->sar[is16_9];
608

    
609
        size = sys->frame_size;
610
    }
611
    return size;
612
}
613

    
614
/*
615
 * The following 6 functions constitute our interface to the world
616
 */
617

    
618
int dv_assemble_frame(DVMuxContext *c, AVStream* st,
619
                      const uint8_t* data, int data_size, uint8_t** frame)
620
{
621
    uint8_t pcm[8192];
622
    int fsize, reqasize;
623

    
624
    *frame = &c->frame_buf[0];
625
    if (c->has_audio && c->has_video) {  /* must be a stale frame */
626
        dv_format_frame(c, *frame);
627
        c->frames++;
628
        if (c->has_audio > 0)
629
            c->has_audio = 0;
630
        c->has_video = 0;
631
    }
632

    
633
    if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
634
        /* FIXME: we have to have more sensible approach than this one */
635
        if (c->has_video)
636
            av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
637

    
638
        dv_inject_video(c, data, *frame);
639
        c->has_video = 1;
640
        data_size = 0;
641
        if (c->has_audio < 0)
642
            goto out;
643
    }
644

    
645
    reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);
646
    fsize = fifo_size(&c->audio_data, c->audio_data.rptr);
647
    if (st->codec->codec_type == CODEC_TYPE_AUDIO || (c->has_video && fsize >= reqasize)) {
648
        if (fsize + data_size >= reqasize && !c->has_audio) {
649
            if (fsize >= reqasize) {
650
                fifo_read(&c->audio_data, &pcm[0], reqasize, &c->audio_data.rptr);
651
            } else {
652
                fifo_read(&c->audio_data, &pcm[0], fsize, &c->audio_data.rptr);
653
                memcpy(&pcm[fsize], &data[0], reqasize - fsize);
654
                data += reqasize - fsize;
655
                data_size -= reqasize - fsize;
656
            }
657
            dv_inject_audio(c, &pcm[0], *frame);
658
            c->has_audio = 1;
659
        }
660

    
661
        /* FIXME: we have to have more sensible approach than this one */
662
        if (fifo_size(&c->audio_data, c->audio_data.rptr) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE)
663
            av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
664
        fifo_write(&c->audio_data, (uint8_t *)data, data_size, &c->audio_data.wptr);
665
    }
666

    
667
out:
668
    return (c->has_audio && c->has_video) ? c->sys->frame_size : 0;
669
}
670

    
671
DVMuxContext* dv_init_mux(AVFormatContext* s)
672
{
673
    DVMuxContext *c;
674
    AVStream *vst = NULL;
675
    AVStream *ast = NULL;
676
    int i;
677

    
678
    if (s->nb_streams > 2)
679
        return NULL;
680

    
681
    c = av_mallocz(sizeof(DVMuxContext));
682
    if (!c)
683
        return NULL;
684

    
685
    /* We have to sort out where audio and where video stream is */
686
    for (i=0; i<s->nb_streams; i++) {
687
         switch (s->streams[i]->codec->codec_type) {
688
         case CODEC_TYPE_VIDEO:
689
               vst = s->streams[i];
690
               break;
691
         case CODEC_TYPE_AUDIO:
692
               ast = s->streams[i];
693
               break;
694
         default:
695
               goto bail_out;
696
         }
697
    }
698

    
699
    /* Some checks -- DV format is very picky about its incoming streams */
700
    if (!vst || vst->codec->codec_id != CODEC_ID_DVVIDEO)
701
        goto bail_out;
702
    if (ast  && (ast->codec->codec_id != CODEC_ID_PCM_S16LE ||
703
                 ast->codec->sample_rate != 48000 ||
704
                 ast->codec->channels != 2))
705
        goto bail_out;
706
    c->sys = dv_codec_profile(vst->codec);
707
    if (!c->sys)
708
        goto bail_out;
709

    
710
    /* Ok, everything seems to be in working order */
711
    c->frames = 0;
712
    c->has_audio = ast ? 0 : -1;
713
    c->has_video = 0;
714
    c->start_time = (time_t)s->timestamp;
715
    c->aspect = 0; /* 4:3 is the default */
716
    if ((int)(av_q2d(vst->codec->sample_aspect_ratio) * vst->codec->width / vst->codec->height * 10) == 17) /* 16:9 */
717
        c->aspect = 0x07;
718

    
719
    if (ast && fifo_init(&c->audio_data, 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0)
720
        goto bail_out;
721

    
722
    dv_format_frame(c, &c->frame_buf[0]);
723

    
724
    return c;
725

    
726
bail_out:
727
    av_free(c);
728
    return NULL;
729
}
730

    
731
void dv_delete_mux(DVMuxContext *c)
732
{
733
    fifo_free(&c->audio_data);
734
}
735

    
736
DVDemuxContext* dv_init_demux(AVFormatContext *s)
737
{
738
    DVDemuxContext *c;
739

    
740
    c = av_mallocz(sizeof(DVDemuxContext));
741
    if (!c)
742
        return NULL;
743

    
744
    c->vst = av_new_stream(s, 0);
745
    if (!c->vst) {
746
        av_free(c);
747
        return NULL;
748
    }
749

    
750
    c->fctx = s;
751
    c->ast[0] = c->ast[1] = NULL;
752
    c->ach = 0;
753
    c->frames = 0;
754
    c->abytes = 0;
755

    
756
    c->vst->codec->codec_type = CODEC_TYPE_VIDEO;
757
    c->vst->codec->codec_id = CODEC_ID_DVVIDEO;
758
    c->vst->codec->bit_rate = 25000000;
759
    c->vst->start_time = 0;
760

    
761
    return c;
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
    for (i=0; i<c->ach; i++) {
794
       c->audio_pkt[i].size = size;
795
       c->audio_pkt[i].pts  = c->abytes * 30000*8 / c->ast[i]->codec->bit_rate;
796
    }
797
    dv_extract_audio(buf, c->audio_buf[0], c->audio_buf[1]);
798
    c->abytes += size;
799

    
800
    /* Now it's time to return video packet */
801
    size = dv_extract_video_info(c, buf);
802
    av_init_packet(pkt);
803
    pkt->data     = buf;
804
    pkt->size     = size;
805
    pkt->flags   |= PKT_FLAG_KEY;
806
    pkt->stream_index = c->vst->id;
807
    pkt->pts      = c->frames;
808

    
809
    c->frames++;
810

    
811
    return size;
812
}
813

    
814
static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c,
815
                              int64_t timestamp, int flags)
816
{
817
    // FIXME: sys may be wrong if last dv_read_packet() failed (buffer is junk)
818
    const DVprofile* sys = dv_codec_profile(c->vst->codec);
819
    int64_t offset;
820
    int64_t size = url_fsize(&s->pb);
821
    int64_t max_offset = ((size-1) / sys->frame_size) * sys->frame_size;
822

    
823
    offset = sys->frame_size * timestamp;
824

    
825
    if (offset > max_offset) offset = max_offset;
826
    else if (offset < 0) offset = 0;
827

    
828
    return offset;
829
}
830

    
831
void dv_flush_audio_packets(DVDemuxContext *c)
832
{
833
    c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
834
}
835

    
836
/************************************************************
837
 * Implementation of the easiest DV storage of all -- raw DV.
838
 ************************************************************/
839

    
840
typedef struct RawDVContext {
841
    uint8_t         buf[144000];
842
    DVDemuxContext* dv_demux;
843
} RawDVContext;
844

    
845
static int dv_read_header(AVFormatContext *s,
846
                          AVFormatParameters *ap)
847
{
848
    RawDVContext *c = s->priv_data;
849
    const DVprofile* sys;
850
    c->dv_demux = dv_init_demux(s);
851
    if (!c->dv_demux)
852
        return -1;
853

    
854
    if (get_buffer(&s->pb, c->buf, 4) <= 0 || url_fseek(&s->pb, -4, SEEK_CUR) < 0)
855
        return AVERROR_IO;
856

    
857
    sys = dv_frame_profile(c->buf);
858
    s->bit_rate = av_rescale(sys->frame_size * 8, sys->frame_rate, sys->frame_rate_base);
859

    
860
    return 0;
861
}
862

    
863

    
864
static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
865
{
866
    int size;
867
    RawDVContext *c = s->priv_data;
868

    
869
    size = dv_get_packet(c->dv_demux, pkt);
870

    
871
    if (size < 0) {
872
        if (get_buffer(&s->pb, c->buf, 4) <= 0)
873
            return AVERROR_IO;
874

    
875
        size = dv_frame_profile(c->buf)->frame_size;
876
        if (get_buffer(&s->pb, c->buf + 4, size - 4) <= 0)
877
            return AVERROR_IO;
878

    
879
        size = dv_produce_packet(c->dv_demux, pkt, c->buf, size);
880
    }
881

    
882
    return size;
883
}
884

    
885
static int dv_read_seek(AVFormatContext *s, int stream_index,
886
                       int64_t timestamp, int flags)
887
{
888
    RawDVContext *r = s->priv_data;
889
    DVDemuxContext *c = r->dv_demux;
890
    int64_t offset= dv_frame_offset(s, c, timestamp, flags);
891
    const DVprofile* sys = dv_codec_profile(c->vst->codec);
892

    
893
    c->frames= offset / sys->frame_size;
894
    if (c->ach)
895
        c->abytes= av_rescale(c->frames,
896
                          c->ast[0]->codec->bit_rate * (int64_t)sys->frame_rate_base,
897
                          8*sys->frame_rate);
898

    
899
    dv_flush_audio_packets(c);
900
    return url_fseek(&s->pb, offset, SEEK_SET);
901
}
902

    
903
static int dv_read_close(AVFormatContext *s)
904
{
905
    RawDVContext *c = s->priv_data;
906
    av_free(c->dv_demux);
907
    return 0;
908
}
909

    
910
static int dv_write_header(AVFormatContext *s)
911
{
912
    s->priv_data = dv_init_mux(s);
913
    if (!s->priv_data) {
914
        av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
915
                    "Make sure that you supply exactly two streams:\n"
916
                    "     video: 25fps or 29.97fps, audio: 2ch/48Khz/PCM\n");
917
        return -1;
918
    }
919
    return 0;
920
}
921

    
922
static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
923
{
924
    uint8_t* frame;
925
    int fsize;
926

    
927
    fsize = dv_assemble_frame((DVMuxContext *)s->priv_data, s->streams[pkt->stream_index],
928
                              pkt->data, pkt->size, &frame);
929
    if (fsize > 0) {
930
        put_buffer(&s->pb, frame, fsize);
931
        put_flush_packet(&s->pb);
932
    }
933
    return 0;
934
}
935

    
936
/*
937
 * We might end up with some extra A/V data without matching counterpart.
938
 * E.g. video data without enough audio to write the complete frame.
939
 * Currently we simply drop the last frame. I don't know whether this
940
 * is the best strategy of all
941
 */
942
static int dv_write_trailer(struct AVFormatContext *s)
943
{
944
    dv_delete_mux((DVMuxContext *)s->priv_data);
945
    return 0;
946
}
947

    
948
static AVInputFormat dv_iformat = {
949
    "dv",
950
    "DV video format",
951
    sizeof(RawDVContext),
952
    NULL,
953
    dv_read_header,
954
    dv_read_packet,
955
    dv_read_close,
956
    dv_read_seek,
957
    .extensions = "dv,dif",
958
};
959

    
960
static AVOutputFormat dv_oformat = {
961
    "dv",
962
    "DV video format",
963
    NULL,
964
    "dv",
965
    sizeof(DVMuxContext),
966
    CODEC_ID_PCM_S16LE,
967
    CODEC_ID_DVVIDEO,
968
    dv_write_header,
969
    dv_write_packet,
970
    dv_write_trailer,
971
};
972

    
973
int ff_dv_init(void)
974
{
975
    av_register_input_format(&dv_iformat);
976
    av_register_output_format(&dv_oformat);
977
    return 0;
978
}