FFmpeg: libavformat/gxfenc.c Source File

00001 /*
00002  * GXF muxer.
00003  * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier <baptiste dot coudurier at smartjog dot com>
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavutil/avassert.h"
00023 #include "libavutil/intfloat.h"
00024 #include "libavutil/opt.h"
00025 #include "libavutil/mathematics.h"
00026 #include "libavutil/timecode.h"
00027 #include "avformat.h"
00028 #include "internal.h"
00029 #include "gxf.h"
00030 #include "riff.h"
00031 #include "audiointerleave.h"
00032 
00033 #define GXF_AUDIO_PACKET_SIZE 65536
00034 
00035 #define GXF_TIMECODE(c, d, h, m, s, f) \
00036     ((c) << 30 | (d) << 29 | (h) << 24 | (m) << 16 | (s) << 8 | (f))
00037 
00038 typedef struct GXFTimecode{
00039     int hh;
00040     int mm;
00041     int ss;
00042     int ff;
00043     int color;
00044     int drop;
00045 } GXFTimecode;
00046 
00047 typedef struct GXFStreamContext {
00048     AudioInterleaveContext aic;
00049     uint32_t track_type;
00050     uint32_t sample_size;
00051     uint32_t sample_rate;
00052     uint16_t media_type;
00053     uint16_t media_info;
00054     int frame_rate_index;
00055     int lines_index;
00056     int fields;
00057     int iframes;
00058     int pframes;
00059     int bframes;
00060     int p_per_gop;
00061     int b_per_i_or_p; 
00062     int first_gop_closed;
00063     unsigned order;   
00064 } GXFStreamContext;
00065 
00066 typedef struct GXFContext {
00067     AVClass *av_class;
00068     uint32_t nb_fields;
00069     uint16_t audio_tracks;
00070     uint16_t mpeg_tracks;
00071     int64_t creation_time;
00072     uint32_t umf_start_offset;
00073     uint32_t umf_track_offset;
00074     uint32_t umf_media_offset;
00075     uint32_t umf_length;
00076     uint16_t umf_track_size;
00077     uint16_t umf_media_size;
00078     AVRational time_base;
00079     int flags;
00080     GXFStreamContext timecode_track;
00081     unsigned *flt_entries;    
00082     unsigned flt_entries_nb;
00083     uint64_t *map_offsets;    
00084     unsigned map_offsets_nb;
00085     unsigned packet_count;
00086     GXFTimecode tc;
00087 } GXFContext;
00088 
00089 static const struct {
00090     int height, index;
00091 } gxf_lines_tab[] = {
00092     { 480,  1 }, /* NTSC */
00093     { 512,  1 }, /* NTSC + VBI */
00094     { 576,  2 }, /* PAL */
00095     { 608,  2 }, /* PAL + VBI */
00096     { 1080, 4 },
00097     { 720,  6 },
00098 };
00099 
00100 static const AVCodecTag gxf_media_types[] = {
00101     { AV_CODEC_ID_MJPEG     ,   3 }, /* NTSC */
00102     { AV_CODEC_ID_MJPEG     ,   4 }, /* PAL */
00103     { AV_CODEC_ID_PCM_S24LE ,   9 },
00104     { AV_CODEC_ID_PCM_S16LE ,  10 },
00105     { AV_CODEC_ID_MPEG2VIDEO,  11 }, /* NTSC */
00106     { AV_CODEC_ID_MPEG2VIDEO,  12 }, /* PAL */
00107     { AV_CODEC_ID_DVVIDEO   ,  13 }, /* NTSC */
00108     { AV_CODEC_ID_DVVIDEO   ,  14 }, /* PAL */
00109     { AV_CODEC_ID_DVVIDEO   ,  15 }, /* 50M NTSC */
00110     { AV_CODEC_ID_DVVIDEO   ,  16 }, /* 50M PAL */
00111     { AV_CODEC_ID_AC3       ,  17 },
00112     //{ AV_CODEC_ID_NONE,  ,   18 }, /* Non compressed 24 bit audio */
00113     { AV_CODEC_ID_MPEG2VIDEO,  20 }, /* MPEG HD */
00114     { AV_CODEC_ID_MPEG1VIDEO,  22 }, /* NTSC */
00115     { AV_CODEC_ID_MPEG1VIDEO,  23 }, /* PAL */
00116     { AV_CODEC_ID_NONE,         0 },
00117 };
00118 
00119 #define SERVER_PATH "EXT:/PDR/default/"
00120 #define ES_NAME_PATTERN "EXT:/PDR/default/ES."
00121 
00122 static int gxf_find_lines_index(AVStream *st)
00123 {
00124     GXFStreamContext *sc = st->priv_data;
00125     int i;
00126 
00127     for (i = 0; i < 6; ++i) {
00128         if (st->codec->height == gxf_lines_tab[i].height) {
00129             sc->lines_index = gxf_lines_tab[i].index;
00130             return 0;
00131         }
00132     }
00133     return -1;
00134 }
00135 
00136 static void gxf_write_padding(AVIOContext *pb, int64_t to_pad)
00137 {
00138     for (; to_pad > 0; to_pad--) {
00139         avio_w8(pb, 0);
00140     }
00141 }
00142 
00143 static int64_t updatePacketSize(AVIOContext *pb, int64_t pos)
00144 {
00145     int64_t curpos;
00146     int size;
00147 
00148     size = avio_tell(pb) - pos;
00149     if (size % 4) {
00150         gxf_write_padding(pb, 4 - size % 4);
00151         size = avio_tell(pb) - pos;
00152     }
00153     curpos = avio_tell(pb);
00154     avio_seek(pb, pos + 6, SEEK_SET);
00155     avio_wb32(pb, size);
00156     avio_seek(pb, curpos, SEEK_SET);
00157     return curpos - pos;
00158 }
00159 
00160 static int64_t updateSize(AVIOContext *pb, int64_t pos)
00161 {
00162     int64_t curpos;
00163 
00164     curpos = avio_tell(pb);
00165     avio_seek(pb, pos, SEEK_SET);
00166     avio_wb16(pb, curpos - pos - 2);
00167     avio_seek(pb, curpos, SEEK_SET);
00168     return curpos - pos;
00169 }
00170 
00171 static void gxf_write_packet_header(AVIOContext *pb, GXFPktType type)
00172 {
00173     avio_wb32(pb, 0);  /* packet leader for synchro */
00174     avio_w8(pb, 1);
00175     avio_w8(pb, type); /* map packet */
00176     avio_wb32(pb, 0);  /* size */
00177     avio_wb32(pb, 0);  /* reserved */
00178     avio_w8(pb, 0xE1); /* trailer 1 */
00179     avio_w8(pb, 0xE2); /* trailer 2 */
00180 }
00181 
00182 static int gxf_write_mpeg_auxiliary(AVIOContext *pb, AVStream *st)
00183 {
00184     GXFStreamContext *sc = st->priv_data;
00185     char buffer[1024];
00186     int size, starting_line;
00187 
00188     if (sc->iframes) {
00189         sc->p_per_gop = sc->pframes / sc->iframes;
00190         if (sc->pframes % sc->iframes)
00191             sc->p_per_gop++;
00192         if (sc->pframes) {
00193             sc->b_per_i_or_p = sc->bframes / sc->pframes;
00194             if (sc->bframes % sc->pframes)
00195                 sc->b_per_i_or_p++;
00196         }
00197         if (sc->p_per_gop > 9)
00198             sc->p_per_gop = 9; /* ensure value won't take more than one char */
00199         if (sc->b_per_i_or_p > 9)
00200             sc->b_per_i_or_p = 9; /* ensure value won't take more than one char */
00201     }
00202     if (st->codec->height == 512 || st->codec->height == 608)
00203         starting_line = 7; // VBI
00204     else if (st->codec->height == 480)
00205         starting_line = 20;
00206     else
00207         starting_line = 23; // default PAL
00208 
00209     size = snprintf(buffer, sizeof(buffer), "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n"
00210                     "Pix 0\nCf %d\nCg %d\nSl %d\nnl16 %d\nVi 1\nf1 1\n",
00211                     (float)st->codec->bit_rate, sc->p_per_gop, sc->b_per_i_or_p,
00212                     st->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1, sc->first_gop_closed == 1,
00213                     starting_line, (st->codec->height + 15) / 16);
00214     av_assert0(size < sizeof(buffer));
00215     avio_w8(pb, TRACK_MPG_AUX);
00216     avio_w8(pb, size + 1);
00217     avio_write(pb, (uint8_t *)buffer, size + 1);
00218     return size + 3;
00219 }
00220 
00221 static int gxf_write_timecode_auxiliary(AVIOContext *pb, GXFContext *gxf)
00222 {
00223     uint32_t timecode = GXF_TIMECODE(gxf->tc.color, gxf->tc.drop,
00224                                      gxf->tc.hh, gxf->tc.mm,
00225                                      gxf->tc.ss, gxf->tc.ff);
00226 
00227     avio_wl32(pb, timecode);
00228     /* reserved */
00229     avio_wl32(pb, 0);
00230     return 8;
00231 }
00232 
00233 static int gxf_write_track_description(AVFormatContext *s, GXFStreamContext *sc, int index)
00234 {
00235     GXFContext *gxf = s->priv_data;
00236     AVIOContext *pb = s->pb;
00237     int64_t pos;
00238     int mpeg = sc->track_type == 4 || sc->track_type == 9;
00239 
00240     /* track description section */
00241     avio_w8(pb, sc->media_type + 0x80);
00242     avio_w8(pb, index + 0xC0);
00243 
00244     pos = avio_tell(pb);
00245     avio_wb16(pb, 0); /* size */
00246 
00247     /* media file name */
00248     avio_w8(pb, TRACK_NAME);
00249     avio_w8(pb, strlen(ES_NAME_PATTERN) + 3);
00250     avio_write(pb, ES_NAME_PATTERN, sizeof(ES_NAME_PATTERN) - 1);
00251     avio_wb16(pb, sc->media_info);
00252     avio_w8(pb, 0);
00253 
00254     if (!mpeg) {
00255         /* auxiliary information */
00256         avio_w8(pb, TRACK_AUX);
00257         avio_w8(pb, 8);
00258         if (sc->track_type == 3)
00259             gxf_write_timecode_auxiliary(pb, gxf);
00260         else
00261             avio_wl64(pb, 0);
00262     }
00263 
00264     /* file system version */
00265     avio_w8(pb, TRACK_VER);
00266     avio_w8(pb, 4);
00267     avio_wb32(pb, 0);
00268 
00269     if (mpeg)
00270         gxf_write_mpeg_auxiliary(pb, s->streams[index]);
00271 
00272     /* frame rate */
00273     avio_w8(pb, TRACK_FPS);
00274     avio_w8(pb, 4);
00275     avio_wb32(pb, sc->frame_rate_index);
00276 
00277     /* lines per frame */
00278     avio_w8(pb, TRACK_LINES);
00279     avio_w8(pb, 4);
00280     avio_wb32(pb, sc->lines_index);
00281 
00282     /* fields per frame */
00283     avio_w8(pb, TRACK_FPF);
00284     avio_w8(pb, 4);
00285     avio_wb32(pb, sc->fields);
00286 
00287     return updateSize(pb, pos);
00288 }
00289 
00290 static int gxf_write_material_data_section(AVFormatContext *s)
00291 {
00292     GXFContext *gxf = s->priv_data;
00293     AVIOContext *pb = s->pb;
00294     int64_t pos;
00295     int len;
00296     const char *filename = strrchr(s->filename, '/');
00297 
00298     pos = avio_tell(pb);
00299     avio_wb16(pb, 0); /* size */
00300 
00301     /* name */
00302     if (filename)
00303         filename++;
00304     else
00305         filename = s->filename;
00306     len = strlen(filename);
00307 
00308     avio_w8(pb, MAT_NAME);
00309     avio_w8(pb, strlen(SERVER_PATH) + len + 1);
00310     avio_write(pb, SERVER_PATH, sizeof(SERVER_PATH) - 1);
00311     avio_write(pb, filename, len);
00312     avio_w8(pb, 0);
00313 
00314     /* first field */
00315     avio_w8(pb, MAT_FIRST_FIELD);
00316     avio_w8(pb, 4);
00317     avio_wb32(pb, 0);
00318 
00319     /* last field */
00320     avio_w8(pb, MAT_LAST_FIELD);
00321     avio_w8(pb, 4);
00322     avio_wb32(pb, gxf->nb_fields);
00323 
00324     /* reserved */
00325     avio_w8(pb, MAT_MARK_IN);
00326     avio_w8(pb, 4);
00327     avio_wb32(pb, 0);
00328 
00329     avio_w8(pb, MAT_MARK_OUT);
00330     avio_w8(pb, 4);
00331     avio_wb32(pb, gxf->nb_fields);
00332 
00333     /* estimated size */
00334     avio_w8(pb, MAT_SIZE);
00335     avio_w8(pb, 4);
00336     avio_wb32(pb, avio_size(pb) / 1024);
00337 
00338     return updateSize(pb, pos);
00339 }
00340 
00341 static int gxf_write_track_description_section(AVFormatContext *s)
00342 {
00343     GXFContext *gxf = s->priv_data;
00344     AVIOContext *pb = s->pb;
00345     int64_t pos;
00346     int i;
00347 
00348     pos = avio_tell(pb);
00349     avio_wb16(pb, 0); /* size */
00350     for (i = 0; i < s->nb_streams; ++i)
00351         gxf_write_track_description(s, s->streams[i]->priv_data, i);
00352 
00353     gxf_write_track_description(s, &gxf->timecode_track, s->nb_streams);
00354 
00355     return updateSize(pb, pos);
00356 }
00357 
00358 static int gxf_write_map_packet(AVFormatContext *s, int rewrite)
00359 {
00360     GXFContext *gxf = s->priv_data;
00361     AVIOContext *pb = s->pb;
00362     int64_t pos = avio_tell(pb);
00363 
00364     if (!rewrite) {
00365         if (!(gxf->map_offsets_nb % 30)) {
00366             gxf->map_offsets = av_realloc_f(gxf->map_offsets,
00367                                             sizeof(*gxf->map_offsets),
00368                                             gxf->map_offsets_nb+30);
00369             if (!gxf->map_offsets) {
00370                 av_log(s, AV_LOG_ERROR, "could not realloc map offsets\n");
00371                 return -1;
00372             }
00373         }
00374         gxf->map_offsets[gxf->map_offsets_nb++] = pos; // do not increment here
00375     }
00376 
00377     gxf_write_packet_header(pb, PKT_MAP);
00378 
00379     /* preamble */
00380     avio_w8(pb, 0xE0); /* version */
00381     avio_w8(pb, 0xFF); /* reserved */
00382 
00383     gxf_write_material_data_section(s);
00384     gxf_write_track_description_section(s);
00385 
00386     return updatePacketSize(pb, pos);
00387 }
00388 
00389 static int gxf_write_flt_packet(AVFormatContext *s)
00390 {
00391     GXFContext *gxf = s->priv_data;
00392     AVIOContext *pb = s->pb;
00393     int64_t pos = avio_tell(pb);
00394     int fields_per_flt = (gxf->nb_fields+1) / 1000 + 1;
00395     int flt_entries = gxf->nb_fields / fields_per_flt;
00396     int i = 0;
00397 
00398     gxf_write_packet_header(pb, PKT_FLT);
00399 
00400     avio_wl32(pb, fields_per_flt); /* number of fields */
00401     avio_wl32(pb, flt_entries); /* number of active flt entries */
00402 
00403     if (gxf->flt_entries) {
00404         for (i = 0; i < flt_entries; i++)
00405             avio_wl32(pb, gxf->flt_entries[(i*fields_per_flt)>>1]);
00406     }
00407 
00408     for (; i < 1000; i++)
00409         avio_wl32(pb, 0);
00410 
00411     return updatePacketSize(pb, pos);
00412 }
00413 
00414 static int gxf_write_umf_material_description(AVFormatContext *s)
00415 {
00416     GXFContext *gxf = s->priv_data;
00417     AVIOContext *pb = s->pb;
00418     int timecode_base = gxf->time_base.den == 60000 ? 60 : 50;
00419     int64_t timestamp = 0;
00420     AVDictionaryEntry *t;
00421     uint64_t nb_fields;
00422     uint32_t timecode_in; // timecode at mark in
00423     uint32_t timecode_out; // timecode at mark out
00424 
00425     if (t = av_dict_get(s->metadata, "creation_time", NULL, 0))
00426         timestamp = ff_iso8601_to_unix_time(t->value);
00427 
00428     timecode_in = GXF_TIMECODE(gxf->tc.color, gxf->tc.drop,
00429                                gxf->tc.hh, gxf->tc.mm,
00430                                gxf->tc.ss, gxf->tc.ff);
00431 
00432     nb_fields = gxf->nb_fields +
00433                 gxf->tc.hh * (timecode_base * 3600) +
00434                 gxf->tc.mm * (timecode_base * 60)   +
00435                 gxf->tc.ss * timecode_base          +
00436                 gxf->tc.ff;
00437 
00438     timecode_out = GXF_TIMECODE(gxf->tc.color, gxf->tc.drop,
00439                                 nb_fields / (timecode_base * 3600) % 24,
00440                                 nb_fields / (timecode_base * 60)   % 60,
00441                                 nb_fields /  timecode_base % 60,
00442                                 nb_fields %  timecode_base);
00443 
00444     avio_wl32(pb, gxf->flags);
00445     avio_wl32(pb, gxf->nb_fields); /* length of the longest track */
00446     avio_wl32(pb, gxf->nb_fields); /* length of the shortest track */
00447     avio_wl32(pb, 0); /* mark in */
00448     avio_wl32(pb, gxf->nb_fields); /* mark out */
00449     avio_wl32(pb, timecode_in); /* timecode mark in */
00450     avio_wl32(pb, timecode_out); /* timecode mark out */
00451     avio_wl64(pb, timestamp); /* modification time */
00452     avio_wl64(pb, timestamp); /* creation time */
00453     avio_wl16(pb, 0); /* reserved */
00454     avio_wl16(pb, 0); /* reserved */
00455     avio_wl16(pb, gxf->audio_tracks);
00456     avio_wl16(pb, 1); /* timecode track count */
00457     avio_wl16(pb, 0); /* reserved */
00458     avio_wl16(pb, gxf->mpeg_tracks);
00459     return 48;
00460 }
00461 
00462 static int gxf_write_umf_payload(AVFormatContext *s)
00463 {
00464     GXFContext *gxf = s->priv_data;
00465     AVIOContext *pb = s->pb;
00466 
00467     avio_wl32(pb, gxf->umf_length); /* total length of the umf data */
00468     avio_wl32(pb, 3); /* version */
00469     avio_wl32(pb, s->nb_streams+1);
00470     avio_wl32(pb, gxf->umf_track_offset); /* umf track section offset */
00471     avio_wl32(pb, gxf->umf_track_size);
00472     avio_wl32(pb, s->nb_streams+1);
00473     avio_wl32(pb, gxf->umf_media_offset);
00474     avio_wl32(pb, gxf->umf_media_size);
00475     avio_wl32(pb, gxf->umf_length); /* user data offset */
00476     avio_wl32(pb, 0); /* user data size */
00477     avio_wl32(pb, 0); /* reserved */
00478     avio_wl32(pb, 0); /* reserved */
00479     return 48;
00480 }
00481 
00482 static int gxf_write_umf_track_description(AVFormatContext *s)
00483 {
00484     AVIOContext *pb = s->pb;
00485     GXFContext *gxf = s->priv_data;
00486     int64_t pos = avio_tell(pb);
00487     int i;
00488 
00489     gxf->umf_track_offset = pos - gxf->umf_start_offset;
00490     for (i = 0; i < s->nb_streams; ++i) {
00491         GXFStreamContext *sc = s->streams[i]->priv_data;
00492         avio_wl16(pb, sc->media_info);
00493         avio_wl16(pb, 1);
00494     }
00495 
00496     avio_wl16(pb, gxf->timecode_track.media_info);
00497     avio_wl16(pb, 1);
00498 
00499     return avio_tell(pb) - pos;
00500 }
00501 
00502 static int gxf_write_umf_media_mpeg(AVIOContext *pb, AVStream *st)
00503 {
00504     GXFStreamContext *sc = st->priv_data;
00505 
00506     if (st->codec->pix_fmt == PIX_FMT_YUV422P)
00507         avio_wl32(pb, 2);
00508     else
00509         avio_wl32(pb, 1); /* default to 420 */
00510     avio_wl32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */
00511     avio_wl32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */
00512     avio_wl32(pb, 1); /* I picture per GOP */
00513     avio_wl32(pb, sc->p_per_gop);
00514     avio_wl32(pb, sc->b_per_i_or_p);
00515     if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO)
00516         avio_wl32(pb, 2);
00517     else if (st->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO)
00518         avio_wl32(pb, 1);
00519     else
00520         avio_wl32(pb, 0);
00521     avio_wl32(pb, 0); /* reserved */
00522     return 32;
00523 }
00524 
00525 static int gxf_write_umf_media_timecode(AVIOContext *pb, int drop)
00526 {
00527     avio_wl32(pb, drop); /* drop frame */
00528     avio_wl32(pb, 0); /* reserved */
00529     avio_wl32(pb, 0); /* reserved */
00530     avio_wl32(pb, 0); /* reserved */
00531     avio_wl32(pb, 0); /* reserved */
00532     avio_wl32(pb, 0); /* reserved */
00533     avio_wl32(pb, 0); /* reserved */
00534     avio_wl32(pb, 0); /* reserved */
00535     return 32;
00536 }
00537 
00538 static int gxf_write_umf_media_dv(AVIOContext *pb, GXFStreamContext *sc)
00539 {
00540     int i;
00541 
00542     for (i = 0; i < 8; i++) {
00543         avio_wb32(pb, 0);
00544     }
00545     return 32;
00546 }
00547 
00548 static int gxf_write_umf_media_audio(AVIOContext *pb, GXFStreamContext *sc)
00549 {
00550     avio_wl64(pb, av_double2int(1)); /* sound level to begin to */
00551     avio_wl64(pb, av_double2int(1)); /* sound level to begin to */
00552     avio_wl32(pb, 0); /* number of fields over which to ramp up sound level */
00553     avio_wl32(pb, 0); /* number of fields over which to ramp down sound level */
00554     avio_wl32(pb, 0); /* reserved */
00555     avio_wl32(pb, 0); /* reserved */
00556     return 32;
00557 }
00558 
00559 static int gxf_write_umf_media_description(AVFormatContext *s)
00560 {
00561     GXFContext *gxf = s->priv_data;
00562     AVIOContext *pb = s->pb;
00563     int64_t pos;
00564     int i, j;
00565 
00566     pos = avio_tell(pb);
00567     gxf->umf_media_offset = pos - gxf->umf_start_offset;
00568     for (i = 0; i <= s->nb_streams; ++i) {
00569         GXFStreamContext *sc;
00570         int64_t startpos, curpos;
00571 
00572         if (i == s->nb_streams)
00573             sc = &gxf->timecode_track;
00574         else
00575             sc = s->streams[i]->priv_data;
00576 
00577         startpos = avio_tell(pb);
00578         avio_wl16(pb, 0); /* length */
00579         avio_wl16(pb, sc->media_info);
00580         avio_wl16(pb, 0); /* reserved */
00581         avio_wl16(pb, 0); /* reserved */
00582         avio_wl32(pb, gxf->nb_fields);
00583         avio_wl32(pb, 0); /* attributes rw, ro */
00584         avio_wl32(pb, 0); /* mark in */
00585         avio_wl32(pb, gxf->nb_fields); /* mark out */
00586         avio_write(pb, ES_NAME_PATTERN, strlen(ES_NAME_PATTERN));
00587         avio_wb16(pb, sc->media_info);
00588         for (j = strlen(ES_NAME_PATTERN)+2; j < 88; j++)
00589             avio_w8(pb, 0);
00590         avio_wl32(pb, sc->track_type);
00591         avio_wl32(pb, sc->sample_rate);
00592         avio_wl32(pb, sc->sample_size);
00593         avio_wl32(pb, 0); /* reserved */
00594 
00595         if (sc == &gxf->timecode_track)
00596             gxf_write_umf_media_timecode(pb, gxf->tc.drop);
00597         else {
00598             AVStream *st = s->streams[i];
00599             switch (st->codec->codec_id) {
00600             case AV_CODEC_ID_MPEG1VIDEO:
00601             case AV_CODEC_ID_MPEG2VIDEO:
00602                 gxf_write_umf_media_mpeg(pb, st);
00603                 break;
00604             case AV_CODEC_ID_PCM_S16LE:
00605                 gxf_write_umf_media_audio(pb, sc);
00606                 break;
00607             case AV_CODEC_ID_DVVIDEO:
00608                 gxf_write_umf_media_dv(pb, sc);
00609                 break;
00610             }
00611         }
00612 
00613         curpos = avio_tell(pb);
00614         avio_seek(pb, startpos, SEEK_SET);
00615         avio_wl16(pb, curpos - startpos);
00616         avio_seek(pb, curpos, SEEK_SET);
00617     }
00618     return avio_tell(pb) - pos;
00619 }
00620 
00621 static int gxf_write_umf_packet(AVFormatContext *s)
00622 {
00623     GXFContext *gxf = s->priv_data;
00624     AVIOContext *pb = s->pb;
00625     int64_t pos = avio_tell(pb);
00626 
00627     gxf_write_packet_header(pb, PKT_UMF);
00628 
00629     /* preamble */
00630     avio_w8(pb, 3); /* first and last (only) packet */
00631     avio_wb32(pb, gxf->umf_length); /* data length */
00632 
00633     gxf->umf_start_offset = avio_tell(pb);
00634     gxf_write_umf_payload(s);
00635     gxf_write_umf_material_description(s);
00636     gxf->umf_track_size = gxf_write_umf_track_description(s);
00637     gxf->umf_media_size = gxf_write_umf_media_description(s);
00638     gxf->umf_length = avio_tell(pb) - gxf->umf_start_offset;
00639     return updatePacketSize(pb, pos);
00640 }
00641 
00642 static const int GXF_samples_per_frame[] = { 32768, 0 };
00643 
00644 static void gxf_init_timecode_track(GXFStreamContext *sc, GXFStreamContext *vsc)
00645 {
00646     if (!vsc)
00647         return;
00648 
00649     sc->media_type = vsc->sample_rate == 60 ? 7 : 8;
00650     sc->sample_rate = vsc->sample_rate;
00651     sc->media_info = ('T'<<8) | '0';
00652     sc->track_type = 3;
00653     sc->frame_rate_index = vsc->frame_rate_index;
00654     sc->lines_index = vsc->lines_index;
00655     sc->sample_size = 16;
00656     sc->fields = vsc->fields;
00657 }
00658 
00659 static int gxf_init_timecode(AVFormatContext *s, GXFTimecode *tc, const char *tcstr, int fields)
00660 {
00661     char c;
00662 
00663     if (sscanf(tcstr, "%d:%d:%d%c%d", &tc->hh, &tc->mm, &tc->ss, &c, &tc->ff) != 5) {
00664         av_log(s, AV_LOG_ERROR, "unable to parse timecode, "
00665                                 "syntax: hh:mm:ss[:;.]ff\n");
00666         return -1;
00667     }
00668 
00669     tc->color = 0;
00670     tc->drop = c != ':';
00671 
00672     if (fields == 2)
00673         tc->ff = tc->ff * 2;
00674 
00675     return 0;
00676 }
00677 
00678 static int gxf_write_header(AVFormatContext *s)
00679 {
00680     AVIOContext *pb = s->pb;
00681     GXFContext *gxf = s->priv_data;
00682     GXFStreamContext *vsc = NULL;
00683     uint8_t tracks[255] = {0};
00684     int i, media_info = 0;
00685     AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
00686 
00687     if (!pb->seekable) {
00688         av_log(s, AV_LOG_ERROR, "gxf muxer does not support streamed output, patch welcome\n");
00689         return -1;
00690     }
00691 
00692     gxf->flags |= 0x00080000; /* material is simple clip */
00693     for (i = 0; i < s->nb_streams; ++i) {
00694         AVStream *st = s->streams[i];
00695         GXFStreamContext *sc = av_mallocz(sizeof(*sc));
00696         if (!sc)
00697             return AVERROR(ENOMEM);
00698         st->priv_data = sc;
00699 
00700         sc->media_type = ff_codec_get_tag(gxf_media_types, st->codec->codec_id);
00701         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
00702             if (st->codec->codec_id != AV_CODEC_ID_PCM_S16LE) {
00703                 av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n");
00704                 return -1;
00705             }
00706             if (st->codec->sample_rate != 48000) {
00707                 av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n");
00708                 return -1;
00709             }
00710             if (st->codec->channels != 1) {
00711                 av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n");
00712                 return -1;
00713             }
00714             sc->track_type = 2;
00715             sc->sample_rate = st->codec->sample_rate;
00716             avpriv_set_pts_info(st, 64, 1, sc->sample_rate);
00717             sc->sample_size = 16;
00718             sc->frame_rate_index = -2;
00719             sc->lines_index = -2;
00720             sc->fields = -2;
00721             gxf->audio_tracks++;
00722             gxf->flags |= 0x04000000; /* audio is 16 bit pcm */
00723             media_info = 'A';
00724         } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00725             if (i != 0) {
00726                 av_log(s, AV_LOG_ERROR, "video stream must be the first track\n");
00727                 return -1;
00728             }
00729             /* FIXME check from time_base ? */
00730             if (st->codec->height == 480 || st->codec->height == 512) { /* NTSC or NTSC+VBI */
00731                 sc->frame_rate_index = 5;
00732                 sc->sample_rate = 60;
00733                 gxf->flags |= 0x00000080;
00734                 gxf->time_base = (AVRational){ 1001, 60000 };
00735             } else if (st->codec->height == 576 || st->codec->height == 608) { /* PAL or PAL+VBI */
00736                 sc->frame_rate_index = 6;
00737                 sc->media_type++;
00738                 sc->sample_rate = 50;
00739                 gxf->flags |= 0x00000040;
00740                 gxf->time_base = (AVRational){ 1, 50 };
00741             } else {
00742                 av_log(s, AV_LOG_ERROR, "unsupported video resolution, "
00743                        "gxf muxer only accepts PAL or NTSC resolutions currently\n");
00744                 return -1;
00745             }
00746             if (!tcr)
00747                 tcr = av_dict_get(st->metadata, "timecode", NULL, 0);
00748             avpriv_set_pts_info(st, 64, gxf->time_base.num, gxf->time_base.den);
00749             if (gxf_find_lines_index(st) < 0)
00750                 sc->lines_index = -1;
00751             sc->sample_size = st->codec->bit_rate;
00752             sc->fields = 2; /* interlaced */
00753 
00754             vsc = sc;
00755 
00756             switch (st->codec->codec_id) {
00757             case AV_CODEC_ID_MJPEG:
00758                 sc->track_type = 1;
00759                 gxf->flags |= 0x00004000;
00760                 media_info = 'J';
00761                 break;
00762             case AV_CODEC_ID_MPEG1VIDEO:
00763                 sc->track_type = 9;
00764                 gxf->mpeg_tracks++;
00765                 media_info = 'L';
00766                 break;
00767             case AV_CODEC_ID_MPEG2VIDEO:
00768                 sc->first_gop_closed = -1;
00769                 sc->track_type = 4;
00770                 gxf->mpeg_tracks++;
00771                 gxf->flags |= 0x00008000;
00772                 media_info = 'M';
00773                 break;
00774             case AV_CODEC_ID_DVVIDEO:
00775                 if (st->codec->pix_fmt == PIX_FMT_YUV422P) {
00776                     sc->media_type += 2;
00777                     sc->track_type = 6;
00778                     gxf->flags |= 0x00002000;
00779                     media_info = 'E';
00780                 } else {
00781                     sc->track_type = 5;
00782                     gxf->flags |= 0x00001000;
00783                     media_info = 'D';
00784                 }
00785                 break;
00786             default:
00787                 av_log(s, AV_LOG_ERROR, "video codec not supported\n");
00788                 return -1;
00789             }
00790         }
00791         /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */
00792         sc->media_info = media_info<<8 | ('0'+tracks[media_info]++);
00793         sc->order = s->nb_streams - st->index;
00794     }
00795 
00796     if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0)
00797         return -1;
00798 
00799     if (tcr)
00800         gxf_init_timecode(s, &gxf->tc, tcr->value, vsc->fields);
00801 
00802     gxf_init_timecode_track(&gxf->timecode_track, vsc);
00803     gxf->flags |= 0x200000; // time code track is non-drop frame
00804 
00805     gxf_write_map_packet(s, 0);
00806     gxf_write_flt_packet(s);
00807     gxf_write_umf_packet(s);
00808 
00809     gxf->packet_count = 3;
00810 
00811     avio_flush(pb);
00812     return 0;
00813 }
00814 
00815 static int gxf_write_eos_packet(AVIOContext *pb)
00816 {
00817     int64_t pos = avio_tell(pb);
00818 
00819     gxf_write_packet_header(pb, PKT_EOS);
00820     return updatePacketSize(pb, pos);
00821 }
00822 
00823 static int gxf_write_trailer(AVFormatContext *s)
00824 {
00825     GXFContext *gxf = s->priv_data;
00826     AVIOContext *pb = s->pb;
00827     int64_t end;
00828     int i;
00829 
00830     ff_audio_interleave_close(s);
00831 
00832     gxf_write_eos_packet(pb);
00833     end = avio_tell(pb);
00834     avio_seek(pb, 0, SEEK_SET);
00835     /* overwrite map, flt and umf packets with new values */
00836     gxf_write_map_packet(s, 1);
00837     gxf_write_flt_packet(s);
00838     gxf_write_umf_packet(s);
00839     avio_flush(pb);
00840     /* update duration in all map packets */
00841     for (i = 1; i < gxf->map_offsets_nb; i++) {
00842         avio_seek(pb, gxf->map_offsets[i], SEEK_SET);
00843         gxf_write_map_packet(s, 1);
00844         avio_flush(pb);
00845     }
00846 
00847     avio_seek(pb, end, SEEK_SET);
00848 
00849     av_freep(&gxf->flt_entries);
00850     av_freep(&gxf->map_offsets);
00851 
00852     return 0;
00853 }
00854 
00855 static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size)
00856 {
00857     uint32_t c=-1;
00858     int i;
00859     for(i=0; i<size-4 && c!=0x100; i++){
00860         c = (c<<8) + buf[i];
00861         if(c == 0x1B8 && sc->first_gop_closed == -1) /* GOP start code */
00862             sc->first_gop_closed= (buf[i+4]>>6)&1;
00863     }
00864     return (buf[i+1]>>3)&7;
00865 }
00866 
00867 static int gxf_write_media_preamble(AVFormatContext *s, AVPacket *pkt, int size)
00868 {
00869     GXFContext *gxf = s->priv_data;
00870     AVIOContext *pb = s->pb;
00871     AVStream *st = s->streams[pkt->stream_index];
00872     GXFStreamContext *sc = st->priv_data;
00873     unsigned field_nb;
00874     /* If the video is frame-encoded, the frame numbers shall be represented by
00875      * even field numbers.
00876      * see SMPTE360M-2004  6.4.2.1.3 Media field number */
00877     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00878         field_nb = gxf->nb_fields;
00879     } else {
00880         field_nb = av_rescale_rnd(pkt->dts, gxf->time_base.den,
00881                                   (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
00882     }
00883 
00884     avio_w8(pb, sc->media_type);
00885     avio_w8(pb, st->index);
00886     avio_wb32(pb, field_nb);
00887     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
00888         avio_wb16(pb, 0);
00889         avio_wb16(pb, size / 2);
00890     } else if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
00891         int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size);
00892         if (frame_type == AV_PICTURE_TYPE_I) {
00893             avio_w8(pb, 0x0d);
00894             sc->iframes++;
00895         } else if (frame_type == AV_PICTURE_TYPE_B) {
00896             avio_w8(pb, 0x0f);
00897             sc->bframes++;
00898         } else {
00899             avio_w8(pb, 0x0e);
00900             sc->pframes++;
00901         }
00902         avio_wb24(pb, size);
00903     } else if (st->codec->codec_id == AV_CODEC_ID_DVVIDEO) {
00904         avio_w8(pb, size / 4096);
00905         avio_wb24(pb, 0);
00906     } else
00907         avio_wb32(pb, size);
00908     avio_wb32(pb, field_nb);
00909     avio_w8(pb, 1); /* flags */
00910     avio_w8(pb, 0); /* reserved */
00911     return 16;
00912 }
00913 
00914 static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt)
00915 {
00916     GXFContext *gxf = s->priv_data;
00917     AVIOContext *pb = s->pb;
00918     AVStream *st = s->streams[pkt->stream_index];
00919     int64_t pos = avio_tell(pb);
00920     int padding = 0;
00921     int packet_start_offset = avio_tell(pb) / 1024;
00922 
00923     gxf_write_packet_header(pb, PKT_MEDIA);
00924     if (st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */
00925         padding = 4 - pkt->size % 4;
00926     else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
00927         padding = GXF_AUDIO_PACKET_SIZE - pkt->size;
00928     gxf_write_media_preamble(s, pkt, pkt->size + padding);
00929     avio_write(pb, pkt->data, pkt->size);
00930     gxf_write_padding(pb, padding);
00931 
00932     if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
00933         if (!(gxf->flt_entries_nb % 500)) {
00934             gxf->flt_entries = av_realloc_f(gxf->flt_entries,
00935                                             sizeof(*gxf->flt_entries),
00936                                             gxf->flt_entries_nb+500);
00937             if (!gxf->flt_entries) {
00938                 av_log(s, AV_LOG_ERROR, "could not reallocate flt entries\n");
00939                 return -1;
00940             }
00941         }
00942         gxf->flt_entries[gxf->flt_entries_nb++] = packet_start_offset;
00943         gxf->nb_fields += 2; // count fields
00944     }
00945 
00946     updatePacketSize(pb, pos);
00947 
00948     gxf->packet_count++;
00949     if (gxf->packet_count == 100) {
00950         gxf_write_map_packet(s, 0);
00951         gxf->packet_count = 0;
00952     }
00953 
00954     avio_flush(pb);
00955 
00956     return 0;
00957 }
00958 
00959 static int gxf_compare_field_nb(AVFormatContext *s, AVPacket *next, AVPacket *cur)
00960 {
00961     GXFContext *gxf = s->priv_data;
00962     AVPacket *pkt[2] = { cur, next };
00963     int i, field_nb[2];
00964     GXFStreamContext *sc[2];
00965 
00966     for (i = 0; i < 2; i++) {
00967         AVStream *st = s->streams[pkt[i]->stream_index];
00968         sc[i] = st->priv_data;
00969         if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
00970             field_nb[i] = av_rescale_rnd(pkt[i]->dts, gxf->time_base.den,
00971                                          (int64_t)48000*gxf->time_base.num, AV_ROUND_UP);
00972             field_nb[i] &= ~1; // compare against even field number because audio must be before video
00973         } else
00974             field_nb[i] = pkt[i]->dts; // dts are field based
00975     }
00976 
00977     return field_nb[1] > field_nb[0] ||
00978         (field_nb[1] == field_nb[0] && sc[1]->order > sc[0]->order);
00979 }
00980 
00981 static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush)
00982 {
00983     if (pkt && s->streams[pkt->stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
00984         pkt->duration = 2; // enforce 2 fields
00985     return ff_audio_rechunk_interleave(s, out, pkt, flush,
00986                                ff_interleave_packet_per_dts, gxf_compare_field_nb);
00987 }
00988 
00989 AVOutputFormat ff_gxf_muxer = {
00990     .name              = "gxf",
00991     .long_name         = NULL_IF_CONFIG_SMALL("GXF (General eXchange Format)"),
00992     .extensions        = "gxf",
00993     .priv_data_size    = sizeof(GXFContext),
00994     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
00995     .video_codec       = AV_CODEC_ID_MPEG2VIDEO,
00996     .write_header      = gxf_write_header,
00997     .write_packet      = gxf_write_packet,
00998     .write_trailer     = gxf_write_trailer,
00999     .interleave_packet = gxf_interleave_packet,
01000 };