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FFmpeg/libavformat/gxfenc.c

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  1. /*

  2.  * GXF muxer.

  3.  * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. #include "avformat.h"

  23. #include "gxf.h"

  24. #include "riff.h"

  25. #include "audiointerleave.h"

  26. 

  27. #define GXF_AUDIO_PACKET_SIZE 65536

  28. 

  29. typedef struct GXFStreamContext {

  30.     AudioInterleaveContext aic;

  31.     uint32_t track_type;

  32.     uint32_t sample_size;

  33.     uint32_t sample_rate;

  34.     uint16_t media_type;

  35.     uint16_t media_info;

  36.     int frame_rate_index;

  37.     int lines_index;

  38.     int fields;

  39.     int iframes;

  40.     int pframes;

  41.     int bframes;

  42.     int p_per_gop;

  43.     int b_per_i_or_p; ///< number of B frames per I frame or P frame

  44.     int first_gop_closed;

  45.     unsigned order;   ///< interleaving order

  46. } GXFStreamContext;

  47. 

  48. typedef struct GXFContext {

  49.     uint32_t nb_fields;

  50.     uint16_t audio_tracks;

  51.     uint16_t mpeg_tracks;

  52.     int64_t creation_time;

  53.     uint32_t umf_start_offset;

  54.     uint32_t umf_track_offset;

  55.     uint32_t umf_media_offset;

  56.     uint32_t umf_length;

  57.     uint16_t umf_track_size;

  58.     uint16_t umf_media_size;

  59.     AVRational time_base;

  60.     int flags;

  61.     GXFStreamContext timecode_track;

  62.     unsigned *flt_entries;    ///< offsets of packets /1024, starts after 2nd video field

  63.     unsigned flt_entries_nb;

  64.     uint64_t *map_offsets;    ///< offset of map packets

  65.     unsigned map_offsets_nb;

  66.     unsigned packet_count;

  67. } GXFContext;

  68. 

  69. static const struct {

  70.     int height, index;

  71. } gxf_lines_tab[] = {

  72.     { 480,  1 }, /* NTSC */

  73.     { 512,  1 }, /* NTSC + VBI */

  74.     { 576,  2 }, /* PAL */

  75.     { 608,  2 }, /* PAL + VBI */

  76.     { 1080, 4 },

  77.     { 720,  6 },

  78. };

  79. 

  80. static const AVCodecTag gxf_media_types[] = {

  81.     { CODEC_ID_MJPEG     ,   3 }, /* NTSC */

  82.     { CODEC_ID_MJPEG     ,   4 }, /* PAL */

  83.     { CODEC_ID_PCM_S24LE ,   9 },

  84.     { CODEC_ID_PCM_S16LE ,  10 },

  85.     { CODEC_ID_MPEG2VIDEO,  11 }, /* NTSC */

  86.     { CODEC_ID_MPEG2VIDEO,  12 }, /* PAL */

  87.     { CODEC_ID_DVVIDEO   ,  13 }, /* NTSC */

  88.     { CODEC_ID_DVVIDEO   ,  14 }, /* PAL */

  89.     { CODEC_ID_DVVIDEO   ,  15 }, /* 50M NTSC */

  90.     { CODEC_ID_DVVIDEO   ,  16 }, /* 50M PAL */

  91.     { CODEC_ID_AC3       ,  17 },

  92.     //{ CODEC_ID_NONE,  ,   18 }, /* Non compressed 24 bit audio */

  93.     { CODEC_ID_MPEG2VIDEO,  20 }, /* MPEG HD */

  94.     { CODEC_ID_MPEG1VIDEO,  22 }, /* NTSC */

  95.     { CODEC_ID_MPEG1VIDEO,  23 }, /* PAL */

  96.     { CODEC_ID_NONE,         0 },

  97. };

  98. 

  99. #define SERVER_PATH "EXT:/PDR/default/"

  100. #define ES_NAME_PATTERN "EXT:/PDR/default/ES."

  101. 

  102. static int gxf_find_lines_index(AVStream *st)

  103. {

  104.     GXFStreamContext *sc = st->priv_data;

  105.     int i;

  106. 

  107.     for (i = 0; i < 6; ++i) {

  108.         if (st->codec->height == gxf_lines_tab[i].height) {

  109.             sc->lines_index = gxf_lines_tab[i].index;

  110.             return 0;

  111.         }

  112.     }

  113.     return -1;

  114. }

  115. 

  116. static void gxf_write_padding(ByteIOContext *pb, int64_t to_pad)

  117. {

  118.     for (; to_pad > 0; to_pad--) {

  119.         put_byte(pb, 0);

  120.     }

  121. }

  122. 

  123. static int64_t updatePacketSize(ByteIOContext *pb, int64_t pos)

  124. {

  125.     int64_t curpos;

  126.     int size;

  127. 

  128.     size = url_ftell(pb) - pos;

  129.     if (size % 4) {

  130.         gxf_write_padding(pb, 4 - size % 4);

  131.         size = url_ftell(pb) - pos;

  132.     }

  133.     curpos = url_ftell(pb);

  134.     url_fseek(pb, pos + 6, SEEK_SET);

  135.     put_be32(pb, size);

  136.     url_fseek(pb, curpos, SEEK_SET);

  137.     return curpos - pos;

  138. }

  139. 

  140. static int64_t updateSize(ByteIOContext *pb, int64_t pos)

  141. {

  142.     int64_t curpos;

  143. 

  144.     curpos = url_ftell(pb);

  145.     url_fseek(pb, pos, SEEK_SET);

  146.     put_be16(pb, curpos - pos - 2);

  147.     url_fseek(pb, curpos, SEEK_SET);

  148.     return curpos - pos;

  149. }

  150. 

  151. static void gxf_write_packet_header(ByteIOContext *pb, GXFPktType type)

  152. {

  153.     put_be32(pb, 0); /* packet leader for synchro */

  154.     put_byte(pb, 1);

  155.     put_byte(pb, type); /* map packet */

  156.     put_be32(pb, 0); /* size */

  157.     put_be32(pb, 0); /* reserved */

  158.     put_byte(pb, 0xE1); /* trailer 1 */

  159.     put_byte(pb, 0xE2); /* trailer 2 */

  160. }

  161. 

  162. static int gxf_write_mpeg_auxiliary(ByteIOContext *pb, AVStream *st)

  163. {

  164.     GXFStreamContext *sc = st->priv_data;

  165.     char buffer[1024];

  166.     int size, starting_line;

  167. 

  168.     if (sc->iframes) {

  169.         sc->p_per_gop = sc->pframes / sc->iframes;

  170.         if (sc->pframes % sc->iframes)

  171.             sc->p_per_gop++;

  172.         if (sc->pframes) {

  173.             sc->b_per_i_or_p = sc->bframes / sc->pframes;

  174.             if (sc->bframes % sc->pframes)

  175.                 sc->b_per_i_or_p++;

  176.         }

  177.         if (sc->p_per_gop > 9)

  178.             sc->p_per_gop = 9; /* ensure value won't take more than one char */

  179.         if (sc->b_per_i_or_p > 9)

  180.             sc->b_per_i_or_p = 9; /* ensure value won't take more than one char */

  181.     }

  182.     if (st->codec->height == 512 || st->codec->height == 608)

  183.         starting_line = 7; // VBI

  184.     else if (st->codec->height == 480)

  185.         starting_line = 20;

  186.     else

  187.         starting_line = 23; // default PAL

  188. 

  189.     size = snprintf(buffer, 1024, "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n"

  190.                     "Pix 0\nCf %d\nCg %d\nSl %d\nnl16 %d\nVi 1\nf1 1\n",

  191.                     (float)st->codec->bit_rate, sc->p_per_gop, sc->b_per_i_or_p,

  192.                     st->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1, sc->first_gop_closed == 1,

  193.                     starting_line, st->codec->height / 16);

  194.     put_byte(pb, TRACK_MPG_AUX);

  195.     put_byte(pb, size + 1);

  196.     put_buffer(pb, (uint8_t *)buffer, size + 1);

  197.     return size + 3;

  198. }

  199. 

  200. static int gxf_write_timecode_auxiliary(ByteIOContext *pb, GXFStreamContext *sc)

  201. {

  202.     put_byte(pb, 0); /* fields */

  203.     put_byte(pb, 0);  /* seconds */

  204.     put_byte(pb, 0); /* minutes */

  205.     put_byte(pb, 0); /* flags + hours */

  206.     /* reserved */

  207.     put_be32(pb, 0);

  208.     return 8;

  209. }

  210. 

  211. static int gxf_write_track_description(AVFormatContext *s, GXFStreamContext *sc, int index)

  212. {

  213.     ByteIOContext *pb = s->pb;

  214.     int64_t pos;

  215.     int mpeg = sc->track_type == 4 || sc->track_type == 9;

  216. 

  217.     /* track description section */

  218.     put_byte(pb, sc->media_type + 0x80);

  219.     put_byte(pb, index + 0xC0);

  220. 

  221.     pos = url_ftell(pb);

  222.     put_be16(pb, 0); /* size */

  223. 

  224.     /* media file name */

  225.     put_byte(pb, TRACK_NAME);

  226.     put_byte(pb, strlen(ES_NAME_PATTERN) + 3);

  227.     put_tag(pb, ES_NAME_PATTERN);

  228.     put_be16(pb, sc->media_info);

  229.     put_byte(pb, 0);

  230. 

  231.     if (!mpeg) {

  232.         /* auxiliary information */

  233.         put_byte(pb, TRACK_AUX);

  234.         put_byte(pb, 8);

  235.         if (sc->track_type == 3)

  236.             gxf_write_timecode_auxiliary(pb, sc);

  237.         else

  238.             put_le64(pb, 0);

  239.     }

  240. 

  241.     /* file system version */

  242.     put_byte(pb, TRACK_VER);

  243.     put_byte(pb, 4);

  244.     put_be32(pb, 0);

  245. 

  246.     if (mpeg)

  247.         gxf_write_mpeg_auxiliary(pb, s->streams[index]);

  248. 

  249.     /* frame rate */

  250.     put_byte(pb, TRACK_FPS);

  251.     put_byte(pb, 4);

  252.     put_be32(pb, sc->frame_rate_index);

  253. 

  254.     /* lines per frame */

  255.     put_byte(pb, TRACK_LINES);

  256.     put_byte(pb, 4);

  257.     put_be32(pb, sc->lines_index);

  258. 

  259.     /* fields per frame */

  260.     put_byte(pb, TRACK_FPF);

  261.     put_byte(pb, 4);

  262.     put_be32(pb, sc->fields);

  263. 

  264.     return updateSize(pb, pos);

  265. }

  266. 

  267. static int gxf_write_material_data_section(AVFormatContext *s)

  268. {

  269.     GXFContext *gxf = s->priv_data;

  270.     ByteIOContext *pb = s->pb;

  271.     int64_t pos;

  272.     const char *filename = strrchr(s->filename, '/');

  273. 

  274.     pos = url_ftell(pb);

  275.     put_be16(pb, 0); /* size */

  276. 

  277.     /* name */

  278.     if (filename)

  279.         filename++;

  280.     else

  281.         filename = s->filename;

  282.     put_byte(pb, MAT_NAME);

  283.     put_byte(pb, strlen(SERVER_PATH) + strlen(filename) + 1);

  284.     put_tag(pb, SERVER_PATH);

  285.     put_tag(pb, filename);

  286.     put_byte(pb, 0);

  287. 

  288.     /* first field */

  289.     put_byte(pb, MAT_FIRST_FIELD);

  290.     put_byte(pb, 4);

  291.     put_be32(pb, 0);

  292. 

  293.     /* last field */

  294.     put_byte(pb, MAT_LAST_FIELD);

  295.     put_byte(pb, 4);

  296.     put_be32(pb, gxf->nb_fields);

  297. 

  298.     /* reserved */

  299.     put_byte(pb, MAT_MARK_IN);

  300.     put_byte(pb, 4);

  301.     put_be32(pb, 0);

  302. 

  303.     put_byte(pb, MAT_MARK_OUT);

  304.     put_byte(pb, 4);

  305.     put_be32(pb, gxf->nb_fields);

  306. 

  307.     /* estimated size */

  308.     put_byte(pb, MAT_SIZE);

  309.     put_byte(pb, 4);

  310.     put_be32(pb, url_fsize(pb) / 1024);

  311. 

  312.     return updateSize(pb, pos);

  313. }

  314. 

  315. static int gxf_write_track_description_section(AVFormatContext *s)

  316. {

  317.     GXFContext *gxf = s->priv_data;

  318.     ByteIOContext *pb = s->pb;

  319.     int64_t pos;

  320.     int i;

  321. 

  322.     pos = url_ftell(pb);

  323.     put_be16(pb, 0); /* size */

  324.     for (i = 0; i < s->nb_streams; ++i)

  325.         gxf_write_track_description(s, s->streams[i]->priv_data, i);

  326. 

  327.     gxf_write_track_description(s, &gxf->timecode_track, s->nb_streams);

  328. 

  329.     return updateSize(pb, pos);

  330. }

  331. 

  332. static int gxf_write_map_packet(AVFormatContext *s, int rewrite)

  333. {

  334.     GXFContext *gxf = s->priv_data;

  335.     ByteIOContext *pb = s->pb;

  336.     int64_t pos = url_ftell(pb);

  337. 

  338.     if (!rewrite) {

  339.         if (!(gxf->map_offsets_nb % 30)) {

  340.             gxf->map_offsets = av_realloc(gxf->map_offsets,

  341.                                           (gxf->map_offsets_nb+30)*sizeof(*gxf->map_offsets));

  342.             if (!gxf->map_offsets) {

  343.                 av_log(s, AV_LOG_ERROR, "could not realloc map offsets\n");

  344.                 return -1;

  345.             }

  346.         }

  347.         gxf->map_offsets[gxf->map_offsets_nb++] = pos; // do not increment here

  348.     }

  349. 

  350.     gxf_write_packet_header(pb, PKT_MAP);

  351. 

  352.     /* preamble */

  353.     put_byte(pb, 0xE0); /* version */

  354.     put_byte(pb, 0xFF); /* reserved */

  355. 

  356.     gxf_write_material_data_section(s);

  357.     gxf_write_track_description_section(s);

  358. 

  359.     return updatePacketSize(pb, pos);

  360. }

  361. 

  362. static int gxf_write_flt_packet(AVFormatContext *s)

  363. {

  364.     GXFContext *gxf = s->priv_data;

  365.     ByteIOContext *pb = s->pb;

  366.     int64_t pos = url_ftell(pb);

  367.     int fields_per_flt = (gxf->nb_fields+1) / 1000 + 1;

  368.     int flt_entries = gxf->nb_fields / fields_per_flt - 1;

  369.     int i = 0;

  370. 

  371.     gxf_write_packet_header(pb, PKT_FLT);

  372. 

  373.     put_le32(pb, fields_per_flt); /* number of fields */

  374.     put_le32(pb, flt_entries); /* number of active flt entries */

  375. 

  376.     if (gxf->flt_entries) {

  377.         for (i = 0; i < flt_entries; i++)

  378.             put_le32(pb, gxf->flt_entries[(i*fields_per_flt)>>1]);

  379.     }

  380. 

  381.     for (; i < 1000; i++)

  382.         put_le32(pb, 0);

  383. 

  384.     return updatePacketSize(pb, pos);

  385. }

  386. 

  387. static int gxf_write_umf_material_description(AVFormatContext *s)

  388. {

  389.     GXFContext *gxf = s->priv_data;

  390.     ByteIOContext *pb = s->pb;

  391.     int timecode_base = gxf->time_base.den == 60000 ? 60 : 50;

  392. 

  393.     // XXX drop frame

  394.     uint32_t timecode =

  395.         gxf->nb_fields / (timecode_base * 3600) % 24 << 24 | // hours

  396.         gxf->nb_fields / (timecode_base * 60) % 60   << 16 | // minutes

  397.         gxf->nb_fields /  timecode_base % 60         <<  8 | // seconds

  398.         gxf->nb_fields %  timecode_base;                     // fields

  399. 

  400.     put_le32(pb, gxf->flags);

  401.     put_le32(pb, gxf->nb_fields); /* length of the longest track */

  402.     put_le32(pb, gxf->nb_fields); /* length of the shortest track */

  403.     put_le32(pb, 0); /* mark in */

  404.     put_le32(pb, gxf->nb_fields); /* mark out */

  405.     put_le32(pb, 0); /* timecode mark in */

  406.     put_le32(pb, timecode); /* timecode mark out */

  407.     put_le64(pb, s->timestamp); /* modification time */

  408.     put_le64(pb, s->timestamp); /* creation time */

  409.     put_le16(pb, 0); /* reserved */

  410.     put_le16(pb, 0); /* reserved */

  411.     put_le16(pb, gxf->audio_tracks);

  412.     put_le16(pb, 1); /* timecode track count */

  413.     put_le16(pb, 0); /* reserved */

  414.     put_le16(pb, gxf->mpeg_tracks);

  415.     return 48;

  416. }

  417. 

  418. static int gxf_write_umf_payload(AVFormatContext *s)

  419. {

  420.     GXFContext *gxf = s->priv_data;

  421.     ByteIOContext *pb = s->pb;

  422. 

  423.     put_le32(pb, gxf->umf_length); /* total length of the umf data */

  424.     put_le32(pb, 3); /* version */

  425.     put_le32(pb, s->nb_streams+1);

  426.     put_le32(pb, gxf->umf_track_offset); /* umf track section offset */

  427.     put_le32(pb, gxf->umf_track_size);

  428.     put_le32(pb, s->nb_streams+1);

  429.     put_le32(pb, gxf->umf_media_offset);

  430.     put_le32(pb, gxf->umf_media_size);

  431.     put_le32(pb, gxf->umf_length); /* user data offset */

  432.     put_le32(pb, 0); /* user data size */

  433.     put_le32(pb, 0); /* reserved */

  434.     put_le32(pb, 0); /* reserved */

  435.     return 48;

  436. }

  437. 

  438. static int gxf_write_umf_track_description(AVFormatContext *s)

  439. {

  440.     ByteIOContext *pb = s->pb;

  441.     GXFContext *gxf = s->priv_data;

  442.     int64_t pos = url_ftell(pb);

  443.     int i;

  444. 

  445.     gxf->umf_track_offset = pos - gxf->umf_start_offset;

  446.     for (i = 0; i < s->nb_streams; ++i) {

  447.         GXFStreamContext *sc = s->streams[i]->priv_data;

  448.         put_le16(pb, sc->media_info);

  449.         put_le16(pb, 1);

  450.     }

  451. 

  452.     put_le16(pb, gxf->timecode_track.media_info);

  453.     put_le16(pb, 1);

  454. 

  455.     return url_ftell(pb) - pos;

  456. }

  457. 

  458. static int gxf_write_umf_media_mpeg(ByteIOContext *pb, AVStream *st)

  459. {

  460.     GXFStreamContext *sc = st->priv_data;

  461. 

  462.     if (st->codec->pix_fmt == PIX_FMT_YUV422P)

  463.         put_le32(pb, 2);

  464.     else

  465.         put_le32(pb, 1); /* default to 420 */

  466.     put_le32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */

  467.     put_le32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */

  468.     put_le32(pb, 1); /* I picture per GOP */

  469.     put_le32(pb, sc->p_per_gop);

  470.     put_le32(pb, sc->b_per_i_or_p);

  471.     if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO)

  472.         put_le32(pb, 2);

  473.     else if (st->codec->codec_id == CODEC_ID_MPEG1VIDEO)

  474.         put_le32(pb, 1);

  475.     else

  476.         put_le32(pb, 0);

  477.     put_le32(pb, 0); /* reserved */

  478.     return 32;

  479. }

  480. 

  481. static int gxf_write_umf_media_timecode(ByteIOContext *pb, GXFStreamContext *sc)

  482. {

  483.     put_le32(pb, 1); /* non drop frame */

  484.     put_le32(pb, 0); /* reserved */

  485.     put_le32(pb, 0); /* reserved */

  486.     put_le32(pb, 0); /* reserved */

  487.     put_le32(pb, 0); /* reserved */

  488.     put_le32(pb, 0); /* reserved */

  489.     put_le32(pb, 0); /* reserved */

  490.     put_le32(pb, 0); /* reserved */

  491.     return 32;

  492. }

  493. 

  494. static int gxf_write_umf_media_dv(ByteIOContext *pb, GXFStreamContext *sc)

  495. {

  496.     int i;

  497. 

  498.     for (i = 0; i < 8; i++) {

  499.         put_be32(pb, 0);

  500.     }

  501.     return 32;

  502. }

  503. 

  504. static int gxf_write_umf_media_audio(ByteIOContext *pb, GXFStreamContext *sc)

  505. {

  506.     put_le64(pb, av_dbl2int(1)); /* sound level to begin to */

  507.     put_le64(pb, av_dbl2int(1)); /* sound level to begin to */

  508.     put_le32(pb, 0); /* number of fields over which to ramp up sound level */

  509.     put_le32(pb, 0); /* number of fields over which to ramp down sound level */

  510.     put_le32(pb, 0); /* reserved */

  511.     put_le32(pb, 0); /* reserved */

  512.     return 32;

  513. }

  514. 

  515. #if 0

  516. static int gxf_write_umf_media_mjpeg(ByteIOContext *pb, GXFStreamContext *sc)

  517. {

  518.     put_be64(pb, 0); /* FIXME FLOAT max chroma quant level */

  519.     put_be64(pb, 0); /* FIXME FLOAT max luma quant level */

  520.     put_be64(pb, 0); /* FIXME FLOAT min chroma quant level */

  521.     put_be64(pb, 0); /* FIXME FLOAT min luma quant level */

  522.     return 32;

  523. }

  524. #endif

  525. 

  526. static int gxf_write_umf_media_description(AVFormatContext *s)

  527. {

  528.     GXFContext *gxf = s->priv_data;

  529.     ByteIOContext *pb = s->pb;

  530.     int64_t pos;

  531.     int i, j;

  532. 

  533.     pos = url_ftell(pb);

  534.     gxf->umf_media_offset = pos - gxf->umf_start_offset;

  535.     for (i = 0; i <= s->nb_streams; ++i) {

  536.         GXFStreamContext *sc;

  537.         int64_t startpos, curpos;

  538. 

  539.         if (i == s->nb_streams)

  540.             sc = &gxf->timecode_track;

  541.         else

  542.             sc = s->streams[i]->priv_data;

  543. 

  544.         startpos = url_ftell(pb);

  545.         put_le16(pb, 0); /* length */

  546.         put_le16(pb, sc->media_info);

  547.         put_le16(pb, 0); /* reserved */

  548.         put_le16(pb, 0); /* reserved */

  549.         put_le32(pb, gxf->nb_fields);

  550.         put_le32(pb, 0); /* attributes rw, ro */

  551.         put_le32(pb, 0); /* mark in */

  552.         put_le32(pb, gxf->nb_fields); /* mark out */

  553.         put_buffer(pb, ES_NAME_PATTERN, strlen(ES_NAME_PATTERN));

  554.         put_be16(pb, sc->media_info);

  555.         for (j = strlen(ES_NAME_PATTERN)+2; j < 88; j++)

  556.             put_byte(pb, 0);

  557.         put_le32(pb, sc->track_type);

  558.         put_le32(pb, sc->sample_rate);

  559.         put_le32(pb, sc->sample_size);

  560.         put_le32(pb, 0); /* reserved */

  561. 

  562.         if (sc == &gxf->timecode_track)

  563.             gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */

  564.         else {

  565.             AVStream *st = s->streams[i];

  566.             switch (st->codec->codec_id) {

  567.             case CODEC_ID_MPEG2VIDEO:

  568.                 gxf_write_umf_media_mpeg(pb, st);

  569.                 break;

  570.             case CODEC_ID_PCM_S16LE:

  571.                 gxf_write_umf_media_audio(pb, sc);

  572.                 break;

  573.             case CODEC_ID_DVVIDEO:

  574.                 gxf_write_umf_media_dv(pb, sc);

  575.                 break;

  576.             }

  577.         }

  578. 

  579.         curpos = url_ftell(pb);

  580.         url_fseek(pb, startpos, SEEK_SET);

  581.         put_le16(pb, curpos - startpos);

  582.         url_fseek(pb, curpos, SEEK_SET);

  583.     }

  584.     return url_ftell(pb) - pos;

  585. }

  586. 

  587. static int gxf_write_umf_packet(AVFormatContext *s)

  588. {

  589.     GXFContext *gxf = s->priv_data;

  590.     ByteIOContext *pb = s->pb;

  591.     int64_t pos = url_ftell(pb);

  592. 

  593.     gxf_write_packet_header(pb, PKT_UMF);

  594. 

  595.     /* preamble */

  596.     put_byte(pb, 3); /* first and last (only) packet */

  597.     put_be32(pb, gxf->umf_length); /* data length */

  598. 

  599.     gxf->umf_start_offset = url_ftell(pb);

  600.     gxf_write_umf_payload(s);

  601.     gxf_write_umf_material_description(s);

  602.     gxf->umf_track_size = gxf_write_umf_track_description(s);

  603.     gxf->umf_media_size = gxf_write_umf_media_description(s);

  604.     gxf->umf_length = url_ftell(pb) - gxf->umf_start_offset;

  605.     return updatePacketSize(pb, pos);

  606. }

  607. 

  608. static const int GXF_samples_per_frame[] = { 32768, 0 };

  609. 

  610. static void gxf_init_timecode_track(GXFStreamContext *sc, GXFStreamContext *vsc)

  611. {

  612.     if (!vsc)

  613.         return;

  614. 

  615.     sc->media_type = vsc->sample_rate == 60 ? 7 : 8;

  616.     sc->sample_rate = vsc->sample_rate;

  617.     sc->media_info = ('T'<<8) | '0';

  618.     sc->track_type = 3;

  619.     sc->frame_rate_index = vsc->frame_rate_index;

  620.     sc->lines_index = vsc->lines_index;

  621.     sc->sample_size = 16;

  622.     sc->fields = vsc->fields;

  623. }

  624. 

  625. static int gxf_write_header(AVFormatContext *s)

  626. {

  627.     ByteIOContext *pb = s->pb;

  628.     GXFContext *gxf = s->priv_data;

  629.     GXFStreamContext *vsc = NULL;

  630.     uint8_t tracks[255] = {0};

  631.     int i, media_info = 0;

  632. 

  633.     if (url_is_streamed(pb)) {

  634.         av_log(s, AV_LOG_ERROR, "gxf muxer does not support streamed output, patch welcome");

  635.         return -1;

  636.     }

  637. 

  638.     gxf->flags |= 0x00080000; /* material is simple clip */

  639.     for (i = 0; i < s->nb_streams; ++i) {

  640.         AVStream *st = s->streams[i];

  641.         GXFStreamContext *sc = av_mallocz(sizeof(*sc));

  642.         if (!sc)

  643.             return AVERROR(ENOMEM);

  644.         st->priv_data = sc;

  645. 

  646.         sc->media_type = ff_codec_get_tag(gxf_media_types, st->codec->codec_id);

  647.         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  648.             if (st->codec->codec_id != CODEC_ID_PCM_S16LE) {

  649.                 av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");

  650.                 return -1;

  651.             }

  652.             if (st->codec->sample_rate != 48000) {

  653.                 av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");

  654.                 return -1;

  655.             }

  656.             if (st->codec->channels != 1) {

  657.                 av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");

  658.                 return -1;

  659.             }

  660.             sc->track_type = 2;

  661.             sc->sample_rate = st->codec->sample_rate;

  662.             av_set_pts_info(st, 64, 1, sc->sample_rate);

  663.             sc->sample_size = 16;

  664.             sc->frame_rate_index = -2;

  665.             sc->lines_index = -2;

  666.             sc->fields = -2;

  667.             gxf->audio_tracks++;

  668.             gxf->flags |= 0x04000000; /* audio is 16 bit pcm */

  669.             media_info = 'A';

  670.         } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  671.             if (i != 0) {

  672.                 av_log(s, AV_LOG_ERROR, "video stream must be the first track\n");

  673.                 return -1;

  674.             }

  675.             /* FIXME check from time_base ? */

  676.             if (st->codec->height == 480 || st->codec->height == 512) { /* NTSC or NTSC+VBI */

  677.                 sc->frame_rate_index = 5;

  678.                 sc->sample_rate = 60;

  679.                 gxf->flags |= 0x00000080;

  680.                 gxf->time_base = (AVRational){ 1001, 60000 };

  681.             } else if (st->codec->height == 576 || st->codec->height == 608) { /* PAL or PAL+VBI */

  682.                 sc->frame_rate_index = 6;

  683.                 sc->media_type++;

  684.                 sc->sample_rate = 50;

  685.                 gxf->flags |= 0x00000040;

  686.                 gxf->time_base = (AVRational){ 1, 50 };

  687.             } else {

  688.                 av_log(s, AV_LOG_ERROR, "unsupported video resolution, "

  689.                        "gxf muxer only accepts PAL or NTSC resolutions currently\n");

  690.                 return -1;

  691.             }

  692.             av_set_pts_info(st, 64, gxf->time_base.num, gxf->time_base.den);

  693.             if (gxf_find_lines_index(st) < 0)

  694.                 sc->lines_index = -1;

  695.             sc->sample_size = st->codec->bit_rate;

  696.             sc->fields = 2; /* interlaced */

  697. 

  698.             vsc = sc;

  699. 

  700.             switch (st->codec->codec_id) {

  701.             case CODEC_ID_MJPEG:

  702.                 sc->track_type = 1;

  703.                 gxf->flags |= 0x00004000;

  704.                 media_info = 'J';

  705.                 break;

  706.             case CODEC_ID_MPEG1VIDEO:

  707.                 sc->track_type = 9;

  708.                 gxf->mpeg_tracks++;

  709.                 media_info = 'L';

  710.                 break;

  711.             case CODEC_ID_MPEG2VIDEO:

  712.                 sc->first_gop_closed = -1;

  713.                 sc->track_type = 4;

  714.                 gxf->mpeg_tracks++;

  715.                 gxf->flags |= 0x00008000;

  716.                 media_info = 'M';

  717.                 break;

  718.             case CODEC_ID_DVVIDEO:

  719.                 if (st->codec->pix_fmt == PIX_FMT_YUV422P) {

  720.                     sc->media_type += 2;

  721.                     sc->track_type = 6;

  722.                     gxf->flags |= 0x00002000;

  723.                     media_info = 'E';

  724.                 } else {

  725.                     sc->track_type = 5;

  726.                     gxf->flags |= 0x00001000;

  727.                     media_info = 'D';

  728.                 }

  729.                 break;

  730.             default:

  731.                 av_log(s, AV_LOG_ERROR, "video codec not supported\n");

  732.                 return -1;

  733.             }

  734.         }

  735.         /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */

  736.         sc->media_info = media_info<<8 | ('0'+tracks[media_info]++);

  737.         sc->order = s->nb_streams - st->index;

  738.     }

  739. 

  740.     if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0)

  741.         return -1;

  742. 

  743.     gxf_init_timecode_track(&gxf->timecode_track, vsc);

  744.     gxf->flags |= 0x200000; // time code track is non-drop frame

  745. 

  746.     gxf_write_map_packet(s, 0);

  747.     gxf_write_flt_packet(s);

  748.     gxf_write_umf_packet(s);

  749. 

  750.     gxf->packet_count = 3;

  751. 

  752.     put_flush_packet(pb);

  753.     return 0;

  754. }

  755. 

  756. static int gxf_write_eos_packet(ByteIOContext *pb)

  757. {

  758.     int64_t pos = url_ftell(pb);

  759. 

  760.     gxf_write_packet_header(pb, PKT_EOS);

  761.     return updatePacketSize(pb, pos);

  762. }

  763. 

  764. static int gxf_write_trailer(AVFormatContext *s)

  765. {

  766.     GXFContext *gxf = s->priv_data;

  767.     ByteIOContext *pb = s->pb;

  768.     int64_t end;

  769.     int i;

  770. 

  771.     ff_audio_interleave_close(s);

  772. 

  773.     gxf_write_eos_packet(pb);

  774.     end = url_ftell(pb);

  775.     url_fseek(pb, 0, SEEK_SET);

  776.     /* overwrite map, flt and umf packets with new values */

  777.     gxf_write_map_packet(s, 1);

  778.     gxf_write_flt_packet(s);

  779.     gxf_write_umf_packet(s);

  780.     put_flush_packet(pb);

  781.     /* update duration in all map packets */

  782.     for (i = 1; i < gxf->map_offsets_nb; i++) {

  783.         url_fseek(pb, gxf->map_offsets[i], SEEK_SET);

  784.         gxf_write_map_packet(s, 1);

  785.         put_flush_packet(pb);

  786.     }

  787. 

  788.     url_fseek(pb, end, SEEK_SET);

  789. 

  790.     av_freep(&gxf->flt_entries);

  791.     av_freep(&gxf->map_offsets);

  792. 

  793.     return 0;

  794. }

  795. 

  796. static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)

  797. {

  798.     uint32_t c=-1;

  799.     int i;

  800.     for(i=0; i<size-4 && c!=0x100; i++){

  801.         c = (c<<8) + buf[i];

  802.         if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */

  803.             sc->first_gop_closed= (buf[i+4]>>6)&1;

  804.     }

  805.     return (buf[i+1]>>3)&7;

  806. }

  807. 

  808. static int gxf_write_media_preamble(AVFormatContext *s, AVPacket *pkt, int size)

  809. {

  810.     GXFContext *gxf = s->priv_data;

  811.     ByteIOContext *pb = s->pb;

  812.     AVStream *st = s->streams[pkt->stream_index];

  813.     GXFStreamContext *sc = st->priv_data;

  814.     unsigned field_nb;

  815.     /* If the video is frame-encoded, the frame numbers shall be represented by

  816.      * even field numbers.

  817.      * see SMPTE360M-2004  6.4.2.1.3 Media field number */

  818.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  819.         field_nb = gxf->nb_fields;

  820.     } else {

  821.         field_nb = av_rescale_rnd(pkt->dts, gxf->time_base.den,

  822.                                   (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);

  823.     }

  824. 

  825.     put_byte(pb, sc->media_type);

  826.     put_byte(pb, st->index);

  827.     put_be32(pb, field_nb);

  828.     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  829.         put_be16(pb, 0);

  830.         put_be16(pb, size / 2);

  831.     } else if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) {

  832.         int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);

  833.         if (frame_type == FF_I_TYPE) {

  834.             put_byte(pb, 0x0d);

  835.             sc->iframes++;

  836.         } else if (frame_type == FF_B_TYPE) {

  837.             put_byte(pb, 0x0f);

  838.             sc->bframes++;

  839.         } else {

  840.             put_byte(pb, 0x0e);

  841.             sc->pframes++;

  842.         }

  843.         put_be24(pb, size);

  844.     } else if (st->codec->codec_id == CODEC_ID_DVVIDEO) {

  845.         put_byte(pb, size / 4096);

  846.         put_be24(pb, 0);

  847.     } else

  848.         put_be32(pb, size);

  849.     put_be32(pb, field_nb);

  850.     put_byte(pb, 1); /* flags */

  851.     put_byte(pb, 0); /* reserved */

  852.     return 16;

  853. }

  854. 

  855. static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)

  856. {

  857.     GXFContext *gxf = s->priv_data;

  858.     ByteIOContext *pb = s->pb;

  859.     AVStream *st = s->streams[pkt->stream_index];

  860.     int64_t pos = url_ftell(pb);

  861.     int padding = 0;

  862. 

  863.     gxf_write_packet_header(pb, PKT_MEDIA);

  864.     if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */

  865.         padding = 4 - pkt->size % 4;

  866.     else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)

  867.         padding = GXF_AUDIO_PACKET_SIZE - pkt->size;

  868.     gxf_write_media_preamble(s, pkt, pkt->size + padding);

  869.     put_buffer(pb, pkt->data, pkt->size);

  870.     gxf_write_padding(pb, padding);

  871. 

  872.     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

  873.         if (!(gxf->flt_entries_nb % 500)) {

  874.             gxf->flt_entries = av_realloc(gxf->flt_entries,

  875.                                           (gxf->flt_entries_nb+500)*sizeof(*gxf->flt_entries));

  876.             if (!gxf->flt_entries) {

  877.                 av_log(s, AV_LOG_ERROR, "could not reallocate flt entries\n");

  878.                 return -1;

  879.             }

  880.         }

  881.         gxf->flt_entries[gxf->flt_entries_nb++] = url_ftell(pb) / 1024;

  882.         gxf->nb_fields += 2; // count fields

  883.     }

  884. 

  885.     updatePacketSize(pb, pos);

  886. 

  887.     gxf->packet_count++;

  888.     if (gxf->packet_count == 100) {

  889.         gxf_write_map_packet(s, 0);

  890.         gxf->packet_count = 0;

  891.     }

  892. 

  893.     put_flush_packet(pb);

  894. 

  895.     return 0;

  896. }

  897. 

  898. static int gxf_compare_field_nb(AVFormatContext *s, AVPacket *next, AVPacket *cur)

  899. {

  900.     GXFContext *gxf = s->priv_data;

  901.     AVPacket *pkt[2] = { cur, next };

  902.     int i, field_nb[2];

  903.     GXFStreamContext *sc[2];

  904. 

  905.     for (i = 0; i < 2; i++) {

  906.         AVStream *st = s->streams[pkt[i]->stream_index];

  907.         sc[i] = st->priv_data;

  908.         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {

  909.             field_nb[i] = av_rescale_rnd(pkt[i]->dts, gxf->time_base.den,

  910.                                          (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);

  911.             field_nb[i] &= ~1; // compare against even field number because audio must be before video

  912.         } else

  913.             field_nb[i] = pkt[i]->dts; // dts are field based

  914.     }

  915. 

  916.     return field_nb[1] > field_nb[0] ||

  917.         (field_nb[1] == field_nb[0] && sc[1]->order > sc[0]->order);

  918. }

  919. 

  920. static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)

  921. {

  922.     if (pkt && s->streams[pkt->stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO)

  923.         pkt->duration = 2; // enforce 2 fields

  924.     return ff_audio_rechunk_interleave(s, out, pkt, flush,

  925.                                av_interleave_packet_per_dts, gxf_compare_field_nb);

  926. }

  927. 

  928. AVOutputFormat gxf_muxer = {

  929.     "gxf",

  930.     NULL_IF_CONFIG_SMALL("GXF format"),

  931.     NULL,

  932.     "gxf",

  933.     sizeof(GXFContext),

  934.     CODEC_ID_PCM_S16LE,

  935.     CODEC_ID_MPEG2VIDEO,

  936.     gxf_write_header,

  937.     gxf_write_packet,

  938.     gxf_write_trailer,

  939.     0,

  940.     NULL,

  941.     gxf_interleave_packet,

  942. };