/* * GXF muxer. * Copyright (c) 2006 SmartJog S.A., Baptiste Coudurier * * This file is part of Libav. * * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/intfloat_readwrite.h" #include "libavutil/mathematics.h" #include "avformat.h" #include "gxf.h" #include "riff.h" #include "audiointerleave.h" #define GXF_AUDIO_PACKET_SIZE 65536 typedef struct GXFStreamContext { AudioInterleaveContext aic; uint32_t track_type; uint32_t sample_size; uint32_t sample_rate; uint16_t media_type; uint16_t media_info; int frame_rate_index; int lines_index; int fields; int iframes; int pframes; int bframes; int p_per_gop; int b_per_i_or_p; ///< number of B frames per I frame or P frame int first_gop_closed; unsigned order; ///< interleaving order } GXFStreamContext; typedef struct GXFContext { uint32_t nb_fields; uint16_t audio_tracks; uint16_t mpeg_tracks; int64_t creation_time; uint32_t umf_start_offset; uint32_t umf_track_offset; uint32_t umf_media_offset; uint32_t umf_length; uint16_t umf_track_size; uint16_t umf_media_size; AVRational time_base; int flags; GXFStreamContext timecode_track; unsigned *flt_entries; ///< offsets of packets /1024, starts after 2nd video field unsigned flt_entries_nb; uint64_t *map_offsets; ///< offset of map packets unsigned map_offsets_nb; unsigned packet_count; } GXFContext; static const struct { int height, index; } gxf_lines_tab[] = { { 480, 1 }, /* NTSC */ { 512, 1 }, /* NTSC + VBI */ { 576, 2 }, /* PAL */ { 608, 2 }, /* PAL + VBI */ { 1080, 4 }, { 720, 6 }, }; static const AVCodecTag gxf_media_types[] = { { CODEC_ID_MJPEG , 3 }, /* NTSC */ { CODEC_ID_MJPEG , 4 }, /* PAL */ { CODEC_ID_PCM_S24LE , 9 }, { CODEC_ID_PCM_S16LE , 10 }, { CODEC_ID_MPEG2VIDEO, 11 }, /* NTSC */ { CODEC_ID_MPEG2VIDEO, 12 }, /* PAL */ { CODEC_ID_DVVIDEO , 13 }, /* NTSC */ { CODEC_ID_DVVIDEO , 14 }, /* PAL */ { CODEC_ID_DVVIDEO , 15 }, /* 50M NTSC */ { CODEC_ID_DVVIDEO , 16 }, /* 50M PAL */ { CODEC_ID_AC3 , 17 }, //{ CODEC_ID_NONE, , 18 }, /* Non compressed 24 bit audio */ { CODEC_ID_MPEG2VIDEO, 20 }, /* MPEG HD */ { CODEC_ID_MPEG1VIDEO, 22 }, /* NTSC */ { CODEC_ID_MPEG1VIDEO, 23 }, /* PAL */ { CODEC_ID_NONE, 0 }, }; #define SERVER_PATH "EXT:/PDR/default/" #define ES_NAME_PATTERN "EXT:/PDR/default/ES." static int gxf_find_lines_index(AVStream *st) { GXFStreamContext *sc = st->priv_data; int i; for (i = 0; i < 6; ++i) { if (st->codec->height == gxf_lines_tab[i].height) { sc->lines_index = gxf_lines_tab[i].index; return 0; } } return -1; } static void gxf_write_padding(AVIOContext *pb, int64_t to_pad) { for (; to_pad > 0; to_pad--) { avio_w8(pb, 0); } } static int64_t updatePacketSize(AVIOContext *pb, int64_t pos) { int64_t curpos; int size; size = avio_tell(pb) - pos; if (size % 4) { gxf_write_padding(pb, 4 - size % 4); size = avio_tell(pb) - pos; } curpos = avio_tell(pb); avio_seek(pb, pos + 6, SEEK_SET); avio_wb32(pb, size); avio_seek(pb, curpos, SEEK_SET); return curpos - pos; } static int64_t updateSize(AVIOContext *pb, int64_t pos) { int64_t curpos; curpos = avio_tell(pb); avio_seek(pb, pos, SEEK_SET); avio_wb16(pb, curpos - pos - 2); avio_seek(pb, curpos, SEEK_SET); return curpos - pos; } static void gxf_write_packet_header(AVIOContext *pb, GXFPktType type) { avio_wb32(pb, 0); /* packet leader for synchro */ avio_w8(pb, 1); avio_w8(pb, type); /* map packet */ avio_wb32(pb, 0); /* size */ avio_wb32(pb, 0); /* reserved */ avio_w8(pb, 0xE1); /* trailer 1 */ avio_w8(pb, 0xE2); /* trailer 2 */ } static int gxf_write_mpeg_auxiliary(AVIOContext *pb, AVStream *st) { GXFStreamContext *sc = st->priv_data; char buffer[1024]; int size, starting_line; if (sc->iframes) { sc->p_per_gop = sc->pframes / sc->iframes; if (sc->pframes % sc->iframes) sc->p_per_gop++; if (sc->pframes) { sc->b_per_i_or_p = sc->bframes / sc->pframes; if (sc->bframes % sc->pframes) sc->b_per_i_or_p++; } if (sc->p_per_gop > 9) sc->p_per_gop = 9; /* ensure value won't take more than one char */ if (sc->b_per_i_or_p > 9) sc->b_per_i_or_p = 9; /* ensure value won't take more than one char */ } if (st->codec->height == 512 || st->codec->height == 608) starting_line = 7; // VBI else if (st->codec->height == 480) starting_line = 20; else starting_line = 23; // default PAL size = snprintf(buffer, 1024, "Ver 1\nBr %.6f\nIpg 1\nPpi %d\nBpiop %d\n" "Pix 0\nCf %d\nCg %d\nSl %d\nnl16 %d\nVi 1\nf1 1\n", (float)st->codec->bit_rate, sc->p_per_gop, sc->b_per_i_or_p, st->codec->pix_fmt == PIX_FMT_YUV422P ? 2 : 1, sc->first_gop_closed == 1, starting_line, (st->codec->height + 15) / 16); avio_w8(pb, TRACK_MPG_AUX); avio_w8(pb, size + 1); avio_write(pb, (uint8_t *)buffer, size + 1); return size + 3; } static int gxf_write_timecode_auxiliary(AVIOContext *pb, GXFStreamContext *sc) { avio_w8(pb, 0); /* fields */ avio_w8(pb, 0); /* seconds */ avio_w8(pb, 0); /* minutes */ avio_w8(pb, 0); /* flags + hours */ /* reserved */ avio_wb32(pb, 0); return 8; } static int gxf_write_track_description(AVFormatContext *s, GXFStreamContext *sc, int index) { AVIOContext *pb = s->pb; int64_t pos; int mpeg = sc->track_type == 4 || sc->track_type == 9; /* track description section */ avio_w8(pb, sc->media_type + 0x80); avio_w8(pb, index + 0xC0); pos = avio_tell(pb); avio_wb16(pb, 0); /* size */ /* media file name */ avio_w8(pb, TRACK_NAME); avio_w8(pb, strlen(ES_NAME_PATTERN) + 3); avio_write(pb, ES_NAME_PATTERN, sizeof(ES_NAME_PATTERN) - 1); avio_wb16(pb, sc->media_info); avio_w8(pb, 0); if (!mpeg) { /* auxiliary information */ avio_w8(pb, TRACK_AUX); avio_w8(pb, 8); if (sc->track_type == 3) gxf_write_timecode_auxiliary(pb, sc); else avio_wl64(pb, 0); } /* file system version */ avio_w8(pb, TRACK_VER); avio_w8(pb, 4); avio_wb32(pb, 0); if (mpeg) gxf_write_mpeg_auxiliary(pb, s->streams[index]); /* frame rate */ avio_w8(pb, TRACK_FPS); avio_w8(pb, 4); avio_wb32(pb, sc->frame_rate_index); /* lines per frame */ avio_w8(pb, TRACK_LINES); avio_w8(pb, 4); avio_wb32(pb, sc->lines_index); /* fields per frame */ avio_w8(pb, TRACK_FPF); avio_w8(pb, 4); avio_wb32(pb, sc->fields); return updateSize(pb, pos); } static int gxf_write_material_data_section(AVFormatContext *s) { GXFContext *gxf = s->priv_data; AVIOContext *pb = s->pb; int64_t pos; int len; const char *filename = strrchr(s->filename, '/'); pos = avio_tell(pb); avio_wb16(pb, 0); /* size */ /* name */ if (filename) filename++; else filename = s->filename; len = strlen(filename); avio_w8(pb, MAT_NAME); avio_w8(pb, strlen(SERVER_PATH) + len + 1); avio_write(pb, SERVER_PATH, sizeof(SERVER_PATH) - 1); avio_write(pb, filename, len); avio_w8(pb, 0); /* first field */ avio_w8(pb, MAT_FIRST_FIELD); avio_w8(pb, 4); avio_wb32(pb, 0); /* last field */ avio_w8(pb, MAT_LAST_FIELD); avio_w8(pb, 4); avio_wb32(pb, gxf->nb_fields); /* reserved */ avio_w8(pb, MAT_MARK_IN); avio_w8(pb, 4); avio_wb32(pb, 0); avio_w8(pb, MAT_MARK_OUT); avio_w8(pb, 4); avio_wb32(pb, gxf->nb_fields); /* estimated size */ avio_w8(pb, MAT_SIZE); avio_w8(pb, 4); avio_wb32(pb, avio_size(pb) / 1024); return updateSize(pb, pos); } static int gxf_write_track_description_section(AVFormatContext *s) { GXFContext *gxf = s->priv_data; AVIOContext *pb = s->pb; int64_t pos; int i; pos = avio_tell(pb); avio_wb16(pb, 0); /* size */ for (i = 0; i < s->nb_streams; ++i) gxf_write_track_description(s, s->streams[i]->priv_data, i); gxf_write_track_description(s, &gxf->timecode_track, s->nb_streams); return updateSize(pb, pos); } static int gxf_write_map_packet(AVFormatContext *s, int rewrite) { GXFContext *gxf = s->priv_data; AVIOContext *pb = s->pb; int64_t pos = avio_tell(pb); if (!rewrite) { if (!(gxf->map_offsets_nb % 30)) { gxf->map_offsets = av_realloc(gxf->map_offsets, (gxf->map_offsets_nb+30)*sizeof(*gxf->map_offsets)); if (!gxf->map_offsets) { av_log(s, AV_LOG_ERROR, "could not realloc map offsets\n"); return -1; } } gxf->map_offsets[gxf->map_offsets_nb++] = pos; // do not increment here } gxf_write_packet_header(pb, PKT_MAP); /* preamble */ avio_w8(pb, 0xE0); /* version */ avio_w8(pb, 0xFF); /* reserved */ gxf_write_material_data_section(s); gxf_write_track_description_section(s); return updatePacketSize(pb, pos); } static int gxf_write_flt_packet(AVFormatContext *s) { GXFContext *gxf = s->priv_data; AVIOContext *pb = s->pb; int64_t pos = avio_tell(pb); int fields_per_flt = (gxf->nb_fields+1) / 1000 + 1; int flt_entries = gxf->nb_fields / fields_per_flt; int i = 0; gxf_write_packet_header(pb, PKT_FLT); avio_wl32(pb, fields_per_flt); /* number of fields */ avio_wl32(pb, flt_entries); /* number of active flt entries */ if (gxf->flt_entries) { for (i = 0; i < flt_entries; i++) avio_wl32(pb, gxf->flt_entries[(i*fields_per_flt)>>1]); } for (; i < 1000; i++) avio_wl32(pb, 0); return updatePacketSize(pb, pos); } static int gxf_write_umf_material_description(AVFormatContext *s) { GXFContext *gxf = s->priv_data; AVIOContext *pb = s->pb; int timecode_base = gxf->time_base.den == 60000 ? 60 : 50; // XXX drop frame uint32_t timecode = gxf->nb_fields / (timecode_base * 3600) % 24 << 24 | // hours gxf->nb_fields / (timecode_base * 60) % 60 << 16 | // minutes gxf->nb_fields / timecode_base % 60 << 8 | // seconds gxf->nb_fields % timecode_base; // fields avio_wl32(pb, gxf->flags); avio_wl32(pb, gxf->nb_fields); /* length of the longest track */ avio_wl32(pb, gxf->nb_fields); /* length of the shortest track */ avio_wl32(pb, 0); /* mark in */ avio_wl32(pb, gxf->nb_fields); /* mark out */ avio_wl32(pb, 0); /* timecode mark in */ avio_wl32(pb, timecode); /* timecode mark out */ avio_wl64(pb, s->timestamp); /* modification time */ avio_wl64(pb, s->timestamp); /* creation time */ avio_wl16(pb, 0); /* reserved */ avio_wl16(pb, 0); /* reserved */ avio_wl16(pb, gxf->audio_tracks); avio_wl16(pb, 1); /* timecode track count */ avio_wl16(pb, 0); /* reserved */ avio_wl16(pb, gxf->mpeg_tracks); return 48; } static int gxf_write_umf_payload(AVFormatContext *s) { GXFContext *gxf = s->priv_data; AVIOContext *pb = s->pb; avio_wl32(pb, gxf->umf_length); /* total length of the umf data */ avio_wl32(pb, 3); /* version */ avio_wl32(pb, s->nb_streams+1); avio_wl32(pb, gxf->umf_track_offset); /* umf track section offset */ avio_wl32(pb, gxf->umf_track_size); avio_wl32(pb, s->nb_streams+1); avio_wl32(pb, gxf->umf_media_offset); avio_wl32(pb, gxf->umf_media_size); avio_wl32(pb, gxf->umf_length); /* user data offset */ avio_wl32(pb, 0); /* user data size */ avio_wl32(pb, 0); /* reserved */ avio_wl32(pb, 0); /* reserved */ return 48; } static int gxf_write_umf_track_description(AVFormatContext *s) { AVIOContext *pb = s->pb; GXFContext *gxf = s->priv_data; int64_t pos = avio_tell(pb); int i; gxf->umf_track_offset = pos - gxf->umf_start_offset; for (i = 0; i < s->nb_streams; ++i) { GXFStreamContext *sc = s->streams[i]->priv_data; avio_wl16(pb, sc->media_info); avio_wl16(pb, 1); } avio_wl16(pb, gxf->timecode_track.media_info); avio_wl16(pb, 1); return avio_tell(pb) - pos; } static int gxf_write_umf_media_mpeg(AVIOContext *pb, AVStream *st) { GXFStreamContext *sc = st->priv_data; if (st->codec->pix_fmt == PIX_FMT_YUV422P) avio_wl32(pb, 2); else avio_wl32(pb, 1); /* default to 420 */ avio_wl32(pb, sc->first_gop_closed == 1); /* closed = 1, open = 0, unknown = 255 */ avio_wl32(pb, 3); /* top = 1, bottom = 2, frame = 3, unknown = 0 */ avio_wl32(pb, 1); /* I picture per GOP */ avio_wl32(pb, sc->p_per_gop); avio_wl32(pb, sc->b_per_i_or_p); if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) avio_wl32(pb, 2); else if (st->codec->codec_id == CODEC_ID_MPEG1VIDEO) avio_wl32(pb, 1); else avio_wl32(pb, 0); avio_wl32(pb, 0); /* reserved */ return 32; } static int gxf_write_umf_media_timecode(AVIOContext *pb, GXFStreamContext *sc) { avio_wl32(pb, 1); /* non drop frame */ avio_wl32(pb, 0); /* reserved */ avio_wl32(pb, 0); /* reserved */ avio_wl32(pb, 0); /* reserved */ avio_wl32(pb, 0); /* reserved */ avio_wl32(pb, 0); /* reserved */ avio_wl32(pb, 0); /* reserved */ avio_wl32(pb, 0); /* reserved */ return 32; } static int gxf_write_umf_media_dv(AVIOContext *pb, GXFStreamContext *sc) { int i; for (i = 0; i < 8; i++) { avio_wb32(pb, 0); } return 32; } static int gxf_write_umf_media_audio(AVIOContext *pb, GXFStreamContext *sc) { avio_wl64(pb, av_dbl2int(1)); /* sound level to begin to */ avio_wl64(pb, av_dbl2int(1)); /* sound level to begin to */ avio_wl32(pb, 0); /* number of fields over which to ramp up sound level */ avio_wl32(pb, 0); /* number of fields over which to ramp down sound level */ avio_wl32(pb, 0); /* reserved */ avio_wl32(pb, 0); /* reserved */ return 32; } #if 0 static int gxf_write_umf_media_mjpeg(AVIOContext *pb, GXFStreamContext *sc) { avio_wb64(pb, 0); /* FIXME FLOAT max chroma quant level */ avio_wb64(pb, 0); /* FIXME FLOAT max luma quant level */ avio_wb64(pb, 0); /* FIXME FLOAT min chroma quant level */ avio_wb64(pb, 0); /* FIXME FLOAT min luma quant level */ return 32; } #endif static int gxf_write_umf_media_description(AVFormatContext *s) { GXFContext *gxf = s->priv_data; AVIOContext *pb = s->pb; int64_t pos; int i, j; pos = avio_tell(pb); gxf->umf_media_offset = pos - gxf->umf_start_offset; for (i = 0; i <= s->nb_streams; ++i) { GXFStreamContext *sc; int64_t startpos, curpos; if (i == s->nb_streams) sc = &gxf->timecode_track; else sc = s->streams[i]->priv_data; startpos = avio_tell(pb); avio_wl16(pb, 0); /* length */ avio_wl16(pb, sc->media_info); avio_wl16(pb, 0); /* reserved */ avio_wl16(pb, 0); /* reserved */ avio_wl32(pb, gxf->nb_fields); avio_wl32(pb, 0); /* attributes rw, ro */ avio_wl32(pb, 0); /* mark in */ avio_wl32(pb, gxf->nb_fields); /* mark out */ avio_write(pb, ES_NAME_PATTERN, strlen(ES_NAME_PATTERN)); avio_wb16(pb, sc->media_info); for (j = strlen(ES_NAME_PATTERN)+2; j < 88; j++) avio_w8(pb, 0); avio_wl32(pb, sc->track_type); avio_wl32(pb, sc->sample_rate); avio_wl32(pb, sc->sample_size); avio_wl32(pb, 0); /* reserved */ if (sc == &gxf->timecode_track) gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */ else { AVStream *st = s->streams[i]; switch (st->codec->codec_id) { case CODEC_ID_MPEG1VIDEO: case CODEC_ID_MPEG2VIDEO: gxf_write_umf_media_mpeg(pb, st); break; case CODEC_ID_PCM_S16LE: gxf_write_umf_media_audio(pb, sc); break; case CODEC_ID_DVVIDEO: gxf_write_umf_media_dv(pb, sc); break; } } curpos = avio_tell(pb); avio_seek(pb, startpos, SEEK_SET); avio_wl16(pb, curpos - startpos); avio_seek(pb, curpos, SEEK_SET); } return avio_tell(pb) - pos; } static int gxf_write_umf_packet(AVFormatContext *s) { GXFContext *gxf = s->priv_data; AVIOContext *pb = s->pb; int64_t pos = avio_tell(pb); gxf_write_packet_header(pb, PKT_UMF); /* preamble */ avio_w8(pb, 3); /* first and last (only) packet */ avio_wb32(pb, gxf->umf_length); /* data length */ gxf->umf_start_offset = avio_tell(pb); gxf_write_umf_payload(s); gxf_write_umf_material_description(s); gxf->umf_track_size = gxf_write_umf_track_description(s); gxf->umf_media_size = gxf_write_umf_media_description(s); gxf->umf_length = avio_tell(pb) - gxf->umf_start_offset; return updatePacketSize(pb, pos); } static const int GXF_samples_per_frame[] = { 32768, 0 }; static void gxf_init_timecode_track(GXFStreamContext *sc, GXFStreamContext *vsc) { if (!vsc) return; sc->media_type = vsc->sample_rate == 60 ? 7 : 8; sc->sample_rate = vsc->sample_rate; sc->media_info = ('T'<<8) | '0'; sc->track_type = 3; sc->frame_rate_index = vsc->frame_rate_index; sc->lines_index = vsc->lines_index; sc->sample_size = 16; sc->fields = vsc->fields; } static int gxf_write_header(AVFormatContext *s) { AVIOContext *pb = s->pb; GXFContext *gxf = s->priv_data; GXFStreamContext *vsc = NULL; uint8_t tracks[255] = {0}; int i, media_info = 0; if (!pb->seekable) { av_log(s, AV_LOG_ERROR, "gxf muxer does not support streamed output, patch welcome"); return -1; } gxf->flags |= 0x00080000; /* material is simple clip */ for (i = 0; i < s->nb_streams; ++i) { AVStream *st = s->streams[i]; GXFStreamContext *sc = av_mallocz(sizeof(*sc)); if (!sc) return AVERROR(ENOMEM); st->priv_data = sc; sc->media_type = ff_codec_get_tag(gxf_media_types, st->codec->codec_id); if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { if (st->codec->codec_id != CODEC_ID_PCM_S16LE) { av_log(s, AV_LOG_ERROR, "only 16 BIT PCM LE allowed for now\n"); return -1; } if (st->codec->sample_rate != 48000) { av_log(s, AV_LOG_ERROR, "only 48000hz sampling rate is allowed\n"); return -1; } if (st->codec->channels != 1) { av_log(s, AV_LOG_ERROR, "only mono tracks are allowed\n"); return -1; } sc->track_type = 2; sc->sample_rate = st->codec->sample_rate; av_set_pts_info(st, 64, 1, sc->sample_rate); sc->sample_size = 16; sc->frame_rate_index = -2; sc->lines_index = -2; sc->fields = -2; gxf->audio_tracks++; gxf->flags |= 0x04000000; /* audio is 16 bit pcm */ media_info = 'A'; } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { if (i != 0) { av_log(s, AV_LOG_ERROR, "video stream must be the first track\n"); return -1; } /* FIXME check from time_base ? */ if (st->codec->height == 480 || st->codec->height == 512) { /* NTSC or NTSC+VBI */ sc->frame_rate_index = 5; sc->sample_rate = 60; gxf->flags |= 0x00000080; gxf->time_base = (AVRational){ 1001, 60000 }; } else if (st->codec->height == 576 || st->codec->height == 608) { /* PAL or PAL+VBI */ sc->frame_rate_index = 6; sc->media_type++; sc->sample_rate = 50; gxf->flags |= 0x00000040; gxf->time_base = (AVRational){ 1, 50 }; } else { av_log(s, AV_LOG_ERROR, "unsupported video resolution, " "gxf muxer only accepts PAL or NTSC resolutions currently\n"); return -1; } av_set_pts_info(st, 64, gxf->time_base.num, gxf->time_base.den); if (gxf_find_lines_index(st) < 0) sc->lines_index = -1; sc->sample_size = st->codec->bit_rate; sc->fields = 2; /* interlaced */ vsc = sc; switch (st->codec->codec_id) { case CODEC_ID_MJPEG: sc->track_type = 1; gxf->flags |= 0x00004000; media_info = 'J'; break; case CODEC_ID_MPEG1VIDEO: sc->track_type = 9; gxf->mpeg_tracks++; media_info = 'L'; break; case CODEC_ID_MPEG2VIDEO: sc->first_gop_closed = -1; sc->track_type = 4; gxf->mpeg_tracks++; gxf->flags |= 0x00008000; media_info = 'M'; break; case CODEC_ID_DVVIDEO: if (st->codec->pix_fmt == PIX_FMT_YUV422P) { sc->media_type += 2; sc->track_type = 6; gxf->flags |= 0x00002000; media_info = 'E'; } else { sc->track_type = 5; gxf->flags |= 0x00001000; media_info = 'D'; } break; default: av_log(s, AV_LOG_ERROR, "video codec not supported\n"); return -1; } } /* FIXME first 10 audio tracks are 0 to 9 next 22 are A to V */ sc->media_info = media_info<<8 | ('0'+tracks[media_info]++); sc->order = s->nb_streams - st->index; } if (ff_audio_interleave_init(s, GXF_samples_per_frame, (AVRational){ 1, 48000 }) < 0) return -1; gxf_init_timecode_track(&gxf->timecode_track, vsc); gxf->flags |= 0x200000; // time code track is non-drop frame gxf_write_map_packet(s, 0); gxf_write_flt_packet(s); gxf_write_umf_packet(s); gxf->packet_count = 3; avio_flush(pb); return 0; } static int gxf_write_eos_packet(AVIOContext *pb) { int64_t pos = avio_tell(pb); gxf_write_packet_header(pb, PKT_EOS); return updatePacketSize(pb, pos); } static int gxf_write_trailer(AVFormatContext *s) { GXFContext *gxf = s->priv_data; AVIOContext *pb = s->pb; int64_t end; int i; ff_audio_interleave_close(s); gxf_write_eos_packet(pb); end = avio_tell(pb); avio_seek(pb, 0, SEEK_SET); /* overwrite map, flt and umf packets with new values */ gxf_write_map_packet(s, 1); gxf_write_flt_packet(s); gxf_write_umf_packet(s); avio_flush(pb); /* update duration in all map packets */ for (i = 1; i < gxf->map_offsets_nb; i++) { avio_seek(pb, gxf->map_offsets[i], SEEK_SET); gxf_write_map_packet(s, 1); avio_flush(pb); } avio_seek(pb, end, SEEK_SET); av_freep(&gxf->flt_entries); av_freep(&gxf->map_offsets); return 0; } static int gxf_parse_mpeg_frame(GXFStreamContext *sc, const uint8_t *buf, int size) { uint32_t c=-1; int i; for(i=0; ifirst_gop_closed == -1) /* GOP start code */ sc->first_gop_closed= (buf[i+4]>>6)&1; } return (buf[i+1]>>3)&7; } static int gxf_write_media_preamble(AVFormatContext *s, AVPacket *pkt, int size) { GXFContext *gxf = s->priv_data; AVIOContext *pb = s->pb; AVStream *st = s->streams[pkt->stream_index]; GXFStreamContext *sc = st->priv_data; unsigned field_nb; /* If the video is frame-encoded, the frame numbers shall be represented by * even field numbers. * see SMPTE360M-2004 6.4.2.1.3 Media field number */ if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { field_nb = gxf->nb_fields; } else { field_nb = av_rescale_rnd(pkt->dts, gxf->time_base.den, (int64_t)48000*gxf->time_base.num, AV_ROUND_UP); } avio_w8(pb, sc->media_type); avio_w8(pb, st->index); avio_wb32(pb, field_nb); if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { avio_wb16(pb, 0); avio_wb16(pb, size / 2); } else if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO) { int frame_type = gxf_parse_mpeg_frame(sc, pkt->data, pkt->size); if (frame_type == AV_PICTURE_TYPE_I) { avio_w8(pb, 0x0d); sc->iframes++; } else if (frame_type == AV_PICTURE_TYPE_B) { avio_w8(pb, 0x0f); sc->bframes++; } else { avio_w8(pb, 0x0e); sc->pframes++; } avio_wb24(pb, size); } else if (st->codec->codec_id == CODEC_ID_DVVIDEO) { avio_w8(pb, size / 4096); avio_wb24(pb, 0); } else avio_wb32(pb, size); avio_wb32(pb, field_nb); avio_w8(pb, 1); /* flags */ avio_w8(pb, 0); /* reserved */ return 16; } static int gxf_write_packet(AVFormatContext *s, AVPacket *pkt) { GXFContext *gxf = s->priv_data; AVIOContext *pb = s->pb; AVStream *st = s->streams[pkt->stream_index]; int64_t pos = avio_tell(pb); int padding = 0; int packet_start_offset = avio_tell(pb) / 1024; gxf_write_packet_header(pb, PKT_MEDIA); if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO && pkt->size % 4) /* MPEG-2 frames must be padded */ padding = 4 - pkt->size % 4; else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) padding = GXF_AUDIO_PACKET_SIZE - pkt->size; gxf_write_media_preamble(s, pkt, pkt->size + padding); avio_write(pb, pkt->data, pkt->size); gxf_write_padding(pb, padding); if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { if (!(gxf->flt_entries_nb % 500)) { gxf->flt_entries = av_realloc(gxf->flt_entries, (gxf->flt_entries_nb+500)*sizeof(*gxf->flt_entries)); if (!gxf->flt_entries) { av_log(s, AV_LOG_ERROR, "could not reallocate flt entries\n"); return -1; } } gxf->flt_entries[gxf->flt_entries_nb++] = packet_start_offset; gxf->nb_fields += 2; // count fields } updatePacketSize(pb, pos); gxf->packet_count++; if (gxf->packet_count == 100) { gxf_write_map_packet(s, 0); gxf->packet_count = 0; } avio_flush(pb); return 0; } static int gxf_compare_field_nb(AVFormatContext *s, AVPacket *next, AVPacket *cur) { GXFContext *gxf = s->priv_data; AVPacket *pkt[2] = { cur, next }; int i, field_nb[2]; GXFStreamContext *sc[2]; for (i = 0; i < 2; i++) { AVStream *st = s->streams[pkt[i]->stream_index]; sc[i] = st->priv_data; if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) { field_nb[i] = av_rescale_rnd(pkt[i]->dts, gxf->time_base.den, (int64_t)48000*gxf->time_base.num, AV_ROUND_UP); field_nb[i] &= ~1; // compare against even field number because audio must be before video } else field_nb[i] = pkt[i]->dts; // dts are field based } return field_nb[1] > field_nb[0] || (field_nb[1] == field_nb[0] && sc[1]->order > sc[0]->order); } static int gxf_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush) { if (pkt && s->streams[pkt->stream_index]->codec->codec_type == AVMEDIA_TYPE_VIDEO) pkt->duration = 2; // enforce 2 fields return ff_audio_rechunk_interleave(s, out, pkt, flush, av_interleave_packet_per_dts, gxf_compare_field_nb); } AVOutputFormat ff_gxf_muxer = { "gxf", NULL_IF_CONFIG_SMALL("GXF format"), NULL, "gxf", sizeof(GXFContext), CODEC_ID_PCM_S16LE, CODEC_ID_MPEG2VIDEO, gxf_write_header, gxf_write_packet, gxf_write_trailer, 0, NULL, gxf_interleave_packet, };