/* * General DV muxer/demuxer * Copyright (c) 2003 Roman Shaposhnik * * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth * of DV technical info. * * Raw DV format * Copyright (c) 2002 Fabrice Bellard * * 50 Mbps (DVCPRO50) support * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com> * * 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 <time.h> #include <stdarg.h> #include "avformat.h" #include "internal.h" #include "libavcodec/dvdata.h" #include "dv.h" #include "libavutil/fifo.h" struct DVMuxContext { const DVprofile* sys; /* current DV profile, e.g.: 525/60, 625/50 */ int n_ast; /* number of stereo audio streams (up to 2) */ AVStream *ast[2]; /* stereo audio streams */ AVFifoBuffer *audio_data[2]; /* FIFO for storing excessive amounts of PCM */ int frames; /* current frame number */ time_t start_time; /* recording start time */ int has_audio; /* frame under contruction has audio */ int has_video; /* frame under contruction has video */ uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under contruction */ }; static const int dv_aaux_packs_dist[12][9] = { { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, }; static int dv_audio_frame_size(const DVprofile* sys, int frame) { return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) / sizeof(sys->audio_samples_dist[0]))]; } static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, ...) { struct tm tc; time_t ct; int ltc_frame; va_list ap; buf[0] = (uint8_t)pack_id; switch (pack_id) { case dv_timecode: ct = (time_t)av_rescale_rnd(c->frames, c->sys->time_base.num, c->sys->time_base.den, AV_ROUND_DOWN); brktimegm(ct, &tc); /* * LTC drop-frame frame counter drops two frames (0 and 1) every * minute, unless it is exactly divisible by 10 */ ltc_frame = (c->frames + 2 * ct / 60 - 2 * ct / 600) % c->sys->ltc_divisor; buf[1] = (0 << 7) | /* color frame: 0 - unsync; 1 - sync mode */ (1 << 6) | /* drop frame timecode: 0 - nondrop; 1 - drop */ ((ltc_frame / 10) << 4) | /* tens of frames */ (ltc_frame % 10); /* units of frames */ buf[2] = (1 << 7) | /* biphase mark polarity correction: 0 - even; 1 - odd */ ((tc.tm_sec / 10) << 4) | /* tens of seconds */ (tc.tm_sec % 10); /* units of seconds */ buf[3] = (1 << 7) | /* binary group flag BGF0 */ ((tc.tm_min / 10) << 4) | /* tens of minutes */ (tc.tm_min % 10); /* units of minutes */ buf[4] = (1 << 7) | /* binary group flag BGF2 */ (1 << 6) | /* binary group flag BGF1 */ ((tc.tm_hour / 10) << 4) | /* tens of hours */ (tc.tm_hour % 10); /* units of hours */ break; case dv_audio_source: /* AAUX source pack */ va_start(ap, buf); buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */ (1 << 6) | /* reserved -- always 1 */ (dv_audio_frame_size(c->sys, c->frames) - c->sys->audio_min_samples[0]); /* # of samples */ buf[2] = (0 << 7) | /* multi-stereo */ (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */ (0 << 4) | /* pair bit: 0 -- one pair of channels */ !!va_arg(ap, int); /* audio mode */ buf[3] = (1 << 7) | /* res */ (1 << 6) | /* multi-language flag */ (c->sys->dsf << 5) | /* system: 60fields/50fields */ (c->sys->n_difchan & 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */ buf[4] = (1 << 7) | /* emphasis: 1 -- off */ (0 << 6) | /* emphasis time constant: 0 -- reserved */ (0 << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */ 0; /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */ va_end(ap); break; case dv_audio_control: buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */ (1 << 4) | /* input source: 1 -- digital input */ (3 << 2) | /* compression: 3 -- no information */ 0; /* misc. info/SMPTE emphasis off */ buf[2] = (1 << 7) | /* recording start point: 1 -- no */ (1 << 6) | /* recording end point: 1 -- no */ (1 << 3) | /* recording mode: 1 -- original */ 7; buf[3] = (1 << 7) | /* direction: 1 -- forward */ (c->sys->pix_fmt == PIX_FMT_YUV420P ? 0x20 : /* speed */ c->sys->ltc_divisor * 4); buf[4] = (1 << 7) | /* reserved -- always 1 */ 0x7f; /* genre category */ break; case dv_audio_recdate: case dv_video_recdate: /* VAUX recording date */ ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num, c->sys->time_base.den, AV_ROUND_DOWN); brktimegm(ct, &tc); buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */ /* 0xff is very likely to be "unknown" */ buf[2] = (3 << 6) | /* reserved -- always 1 */ ((tc.tm_mday / 10) << 4) | /* Tens of day */ (tc.tm_mday % 10); /* Units of day */ buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */ ((tc.tm_mon / 10) << 4) | /* Tens of month */ (tc.tm_mon % 10); /* Units of month */ buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */ (tc.tm_year % 10); /* Units of year */ break; case dv_audio_rectime: /* AAUX recording time */ case dv_video_rectime: /* VAUX recording time */ ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num, c->sys->time_base.den, AV_ROUND_DOWN); brktimegm(ct, &tc); buf[1] = (3 << 6) | /* reserved -- always 1 */ 0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */ buf[2] = (1 << 7) | /* reserved -- always 1 */ ((tc.tm_sec / 10) << 4) | /* Tens of seconds */ (tc.tm_sec % 10); /* Units of seconds */ buf[3] = (1 << 7) | /* reserved -- always 1 */ ((tc.tm_min / 10) << 4) | /* Tens of minutes */ (tc.tm_min % 10); /* Units of minutes */ buf[4] = (3 << 6) | /* reserved -- always 1 */ ((tc.tm_hour / 10) << 4) | /* Tens of hours */ (tc.tm_hour % 10); /* Units of hours */ break; default: buf[1] = buf[2] = buf[3] = buf[4] = 0xff; } return 5; } static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr) { int i, j, d, of, size; size = 4 * dv_audio_frame_size(c->sys, c->frames); frame_ptr += channel * c->sys->difseg_size * 150 * 80; for (i = 0; i < c->sys->difseg_size; i++) { frame_ptr += 6 * 80; /* skip DIF segment header */ for (j = 0; j < 9; j++) { dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], i >= c->sys->difseg_size/2); for (d = 8; d < 80; d+=2) { of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride; if (of*2 >= size) continue; frame_ptr[d] = av_fifo_peek(c->audio_data[channel], of*2+1); // FIXME: maybe we have to admit frame_ptr[d+1] = av_fifo_peek(c->audio_data[channel], of*2); // that DV is a big-endian PCM } frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */ } } } static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame) { int j, k; uint8_t* buf; for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80) { /* DV subcode: 2nd and 3d DIFs */ for (j = 80; j < 80 * 3; j += 80) { for (k = 6; k < 6 * 8; k += 8) dv_write_pack(dv_timecode, c, &buf[j+k]); if (((long)(buf-frame)/(c->sys->frame_size/(c->sys->difseg_size*c->sys->n_difchan))%c->sys->difseg_size) > 5) { /* FIXME: is this really needed ? */ dv_write_pack(dv_video_recdate, c, &buf[j+14]); dv_write_pack(dv_video_rectime, c, &buf[j+22]); dv_write_pack(dv_video_recdate, c, &buf[j+38]); dv_write_pack(dv_video_rectime, c, &buf[j+46]); } } /* DV VAUX: 4th, 5th and 6th 3DIFs */ for (j = 80*3 + 3; j < 80*6; j += 80) { dv_write_pack(dv_video_recdate, c, &buf[j+5*2]); dv_write_pack(dv_video_rectime, c, &buf[j+5*3]); dv_write_pack(dv_video_recdate, c, &buf[j+5*11]); dv_write_pack(dv_video_rectime, c, &buf[j+5*12]); } } } /* * The following 3 functions constitute our interface to the world */ static int dv_assemble_frame(DVMuxContext *c, AVStream* st, uint8_t* data, int data_size, uint8_t** frame) { int i, reqasize; *frame = &c->frame_buf[0]; reqasize = 4 * dv_audio_frame_size(c->sys, c->frames); switch (st->codec->codec_type) { case AVMEDIA_TYPE_VIDEO: /* FIXME: we have to have more sensible approach than this one */ if (c->has_video) av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames); memcpy(*frame, data, c->sys->frame_size); c->has_video = 1; break; case AVMEDIA_TYPE_AUDIO: for (i = 0; i < c->n_ast && st != c->ast[i]; i++); /* FIXME: we have to have more sensible approach than this one */ if (av_fifo_size(c->audio_data[i]) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames); av_fifo_generic_write(c->audio_data[i], data, data_size, NULL); /* Let us see if we've got enough audio for one DV frame. */ c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i); break; default: break; } /* Let us see if we have enough data to construct one DV frame. */ if (c->has_video == 1 && c->has_audio + 1 == 1 << c->n_ast) { dv_inject_metadata(c, *frame); c->has_audio = 0; for (i=0; i < c->n_ast; i++) { dv_inject_audio(c, i, *frame); av_fifo_drain(c->audio_data[i], reqasize); c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i); } c->has_video = 0; c->frames++; return c->sys->frame_size; } return 0; } static DVMuxContext* dv_init_mux(AVFormatContext* s) { DVMuxContext *c = s->priv_data; AVStream *vst = NULL; int i; /* we support at most 1 video and 2 audio streams */ if (s->nb_streams > 3) return NULL; c->n_ast = 0; c->ast[0] = c->ast[1] = NULL; /* We have to sort out where audio and where video stream is */ for (i=0; i<s->nb_streams; i++) { switch (s->streams[i]->codec->codec_type) { case AVMEDIA_TYPE_VIDEO: if (vst) return NULL; vst = s->streams[i]; break; case AVMEDIA_TYPE_AUDIO: if (c->n_ast > 1) return NULL; c->ast[c->n_ast++] = s->streams[i]; break; default: goto bail_out; } } /* Some checks -- DV format is very picky about its incoming streams */ if (!vst || vst->codec->codec_id != CODEC_ID_DVVIDEO) goto bail_out; for (i=0; i<c->n_ast; i++) { if (c->ast[i] && (c->ast[i]->codec->codec_id != CODEC_ID_PCM_S16LE || c->ast[i]->codec->sample_rate != 48000 || c->ast[i]->codec->channels != 2)) goto bail_out; } c->sys = ff_dv_codec_profile(vst->codec); if (!c->sys) goto bail_out; if ((c->n_ast > 1) && (c->sys->n_difchan < 2)) { /* only 1 stereo pair is allowed in 25Mbps mode */ goto bail_out; } /* Ok, everything seems to be in working order */ c->frames = 0; c->has_audio = 0; c->has_video = 0; c->start_time = (time_t)s->timestamp; for (i=0; i < c->n_ast; i++) { if (c->ast[i] && !(c->audio_data[i]=av_fifo_alloc(100*AVCODEC_MAX_AUDIO_FRAME_SIZE))) { while (i > 0) { i--; av_fifo_free(c->audio_data[i]); } goto bail_out; } } return c; bail_out: return NULL; } static void dv_delete_mux(DVMuxContext *c) { int i; for (i=0; i < c->n_ast; i++) av_fifo_free(c->audio_data[i]); } static int dv_write_header(AVFormatContext *s) { if (!dv_init_mux(s)) { av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n" "Make sure that you supply exactly two streams:\n" " video: 25fps or 29.97fps, audio: 2ch/48kHz/PCM\n" " (50Mbps allows an optional second audio stream)\n"); return -1; } return 0; } static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt) { uint8_t* frame; int fsize; fsize = dv_assemble_frame(s->priv_data, s->streams[pkt->stream_index], pkt->data, pkt->size, &frame); if (fsize > 0) { avio_write(s->pb, frame, fsize); avio_flush(s->pb); } return 0; } /* * We might end up with some extra A/V data without matching counterpart. * E.g. video data without enough audio to write the complete frame. * Currently we simply drop the last frame. I don't know whether this * is the best strategy of all */ static int dv_write_trailer(struct AVFormatContext *s) { dv_delete_mux(s->priv_data); return 0; } AVOutputFormat ff_dv_muxer = { "dv", NULL_IF_CONFIG_SMALL("DV video format"), NULL, "dv", sizeof(DVMuxContext), CODEC_ID_PCM_S16LE, CODEC_ID_DVVIDEO, dv_write_header, dv_write_packet, dv_write_trailer, };