yading@11: /* yading@11: * General DV muxer/demuxer yading@11: * Copyright (c) 2003 Roman Shaposhnik yading@11: * yading@11: * Many thanks to Dan Dennedy for providing wealth yading@11: * of DV technical info. yading@11: * yading@11: * Raw DV format yading@11: * Copyright (c) 2002 Fabrice Bellard yading@11: * yading@11: * 50 Mbps (DVCPRO50) support yading@11: * Copyright (c) 2006 Daniel Maas yading@11: * yading@11: * This file is part of FFmpeg. yading@11: * yading@11: * FFmpeg is free software; you can redistribute it and/or yading@11: * modify it under the terms of the GNU Lesser General Public yading@11: * License as published by the Free Software Foundation; either yading@11: * version 2.1 of the License, or (at your option) any later version. yading@11: * yading@11: * FFmpeg is distributed in the hope that it will be useful, yading@11: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@11: * Lesser General Public License for more details. yading@11: * yading@11: * You should have received a copy of the GNU Lesser General Public yading@11: * License along with FFmpeg; if not, write to the Free Software yading@11: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@11: */ yading@11: #include yading@11: #include yading@11: yading@11: #include "avformat.h" yading@11: #include "internal.h" yading@11: #include "libavcodec/dv_profile.h" yading@11: #include "libavcodec/dvdata.h" yading@11: #include "dv.h" yading@11: #include "libavutil/fifo.h" yading@11: #include "libavutil/mathematics.h" yading@11: #include "libavutil/intreadwrite.h" yading@11: #include "libavutil/opt.h" yading@11: #include "libavutil/timecode.h" yading@11: yading@11: #define MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio yading@11: yading@11: struct DVMuxContext { yading@11: AVClass *av_class; yading@11: const DVprofile* sys; /* current DV profile, e.g.: 525/60, 625/50 */ yading@11: int n_ast; /* number of stereo audio streams (up to 2) */ yading@11: AVStream *ast[2]; /* stereo audio streams */ yading@11: AVFifoBuffer *audio_data[2]; /* FIFO for storing excessive amounts of PCM */ yading@11: int frames; /* current frame number */ yading@11: int64_t start_time; /* recording start time */ yading@11: int has_audio; /* frame under construction has audio */ yading@11: int has_video; /* frame under construction has video */ yading@11: uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under construction */ yading@11: AVTimecode tc; /* timecode context */ yading@11: }; yading@11: yading@11: static const int dv_aaux_packs_dist[12][9] = { yading@11: { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, yading@11: { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, yading@11: { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, yading@11: { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, yading@11: { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, yading@11: { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, yading@11: { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, yading@11: { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, yading@11: { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, yading@11: { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, yading@11: { 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff }, yading@11: { 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff }, yading@11: }; yading@11: yading@11: static int dv_audio_frame_size(const DVprofile* sys, int frame) yading@11: { yading@11: return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) / yading@11: sizeof(sys->audio_samples_dist[0]))]; yading@11: } yading@11: yading@11: static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, ...) yading@11: { yading@11: struct tm tc; yading@11: time_t ct; yading@11: uint32_t timecode; yading@11: va_list ap; yading@11: yading@11: buf[0] = (uint8_t)pack_id; yading@11: switch (pack_id) { yading@11: case dv_timecode: yading@11: timecode = av_timecode_get_smpte_from_framenum(&c->tc, c->frames); yading@11: timecode |= 1<<23 | 1<<15 | 1<<7 | 1<<6; // biphase and binary group flags yading@11: AV_WB32(buf + 1, timecode); yading@11: break; yading@11: case dv_audio_source: /* AAUX source pack */ yading@11: va_start(ap, buf); yading@11: buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */ yading@11: (1 << 6) | /* reserved -- always 1 */ yading@11: (dv_audio_frame_size(c->sys, c->frames) - yading@11: c->sys->audio_min_samples[0]); yading@11: /* # of samples */ yading@11: buf[2] = (0 << 7) | /* multi-stereo */ yading@11: (0 << 5) | /* #of audio channels per block: 0 -- 1 channel */ yading@11: (0 << 4) | /* pair bit: 0 -- one pair of channels */ yading@11: !!va_arg(ap, int); /* audio mode */ yading@11: buf[3] = (1 << 7) | /* res */ yading@11: (1 << 6) | /* multi-language flag */ yading@11: (c->sys->dsf << 5) | /* system: 60fields/50fields */ yading@11: (c->sys->n_difchan & 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */ yading@11: buf[4] = (1 << 7) | /* emphasis: 1 -- off */ yading@11: (0 << 6) | /* emphasis time constant: 0 -- reserved */ yading@11: (0 << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */ yading@11: 0; /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */ yading@11: va_end(ap); yading@11: break; yading@11: case dv_audio_control: yading@11: buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */ yading@11: (1 << 4) | /* input source: 1 -- digital input */ yading@11: (3 << 2) | /* compression: 3 -- no information */ yading@11: 0; /* misc. info/SMPTE emphasis off */ yading@11: buf[2] = (1 << 7) | /* recording start point: 1 -- no */ yading@11: (1 << 6) | /* recording end point: 1 -- no */ yading@11: (1 << 3) | /* recording mode: 1 -- original */ yading@11: 7; yading@11: buf[3] = (1 << 7) | /* direction: 1 -- forward */ yading@11: (c->sys->pix_fmt == AV_PIX_FMT_YUV420P ? 0x20 : /* speed */ yading@11: c->sys->ltc_divisor * 4); yading@11: buf[4] = (1 << 7) | /* reserved -- always 1 */ yading@11: 0x7f; /* genre category */ yading@11: break; yading@11: case dv_audio_recdate: yading@11: case dv_video_recdate: /* VAUX recording date */ yading@11: ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num, yading@11: c->sys->time_base.den, AV_ROUND_DOWN); yading@11: ff_brktimegm(ct, &tc); yading@11: buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */ yading@11: /* 0xff is very likely to be "unknown" */ yading@11: buf[2] = (3 << 6) | /* reserved -- always 1 */ yading@11: ((tc.tm_mday / 10) << 4) | /* Tens of day */ yading@11: (tc.tm_mday % 10); /* Units of day */ yading@11: buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */ yading@11: ((tc.tm_mon / 10) << 4) | /* Tens of month */ yading@11: (tc.tm_mon % 10); /* Units of month */ yading@11: buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */ yading@11: (tc.tm_year % 10); /* Units of year */ yading@11: break; yading@11: case dv_audio_rectime: /* AAUX recording time */ yading@11: case dv_video_rectime: /* VAUX recording time */ yading@11: ct = c->start_time + av_rescale_rnd(c->frames, c->sys->time_base.num, yading@11: c->sys->time_base.den, AV_ROUND_DOWN); yading@11: ff_brktimegm(ct, &tc); yading@11: buf[1] = (3 << 6) | /* reserved -- always 1 */ yading@11: 0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */ yading@11: buf[2] = (1 << 7) | /* reserved -- always 1 */ yading@11: ((tc.tm_sec / 10) << 4) | /* Tens of seconds */ yading@11: (tc.tm_sec % 10); /* Units of seconds */ yading@11: buf[3] = (1 << 7) | /* reserved -- always 1 */ yading@11: ((tc.tm_min / 10) << 4) | /* Tens of minutes */ yading@11: (tc.tm_min % 10); /* Units of minutes */ yading@11: buf[4] = (3 << 6) | /* reserved -- always 1 */ yading@11: ((tc.tm_hour / 10) << 4) | /* Tens of hours */ yading@11: (tc.tm_hour % 10); /* Units of hours */ yading@11: break; yading@11: default: yading@11: buf[1] = buf[2] = buf[3] = buf[4] = 0xff; yading@11: } yading@11: return 5; yading@11: } yading@11: yading@11: static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr) yading@11: { yading@11: int i, j, d, of, size; yading@11: size = 4 * dv_audio_frame_size(c->sys, c->frames); yading@11: frame_ptr += channel * c->sys->difseg_size * 150 * 80; yading@11: for (i = 0; i < c->sys->difseg_size; i++) { yading@11: frame_ptr += 6 * 80; /* skip DIF segment header */ yading@11: for (j = 0; j < 9; j++) { yading@11: dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], i >= c->sys->difseg_size/2); yading@11: for (d = 8; d < 80; d+=2) { yading@11: of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride; yading@11: if (of*2 >= size) yading@11: continue; yading@11: yading@11: frame_ptr[d] = *av_fifo_peek2(c->audio_data[channel], of*2+1); // FIXME: maybe we have to admit yading@11: frame_ptr[d+1] = *av_fifo_peek2(c->audio_data[channel], of*2); // that DV is a big-endian PCM yading@11: } yading@11: frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */ yading@11: } yading@11: } yading@11: } yading@11: yading@11: static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame) yading@11: { yading@11: int j, k; yading@11: uint8_t* buf; yading@11: yading@11: for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80) { yading@11: /* DV subcode: 2nd and 3d DIFs */ yading@11: for (j = 80; j < 80 * 3; j += 80) { yading@11: for (k = 6; k < 6 * 8; k += 8) yading@11: dv_write_pack(dv_timecode, c, &buf[j+k]); yading@11: yading@11: 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 ? */ yading@11: dv_write_pack(dv_video_recdate, c, &buf[j+14]); yading@11: dv_write_pack(dv_video_rectime, c, &buf[j+22]); yading@11: dv_write_pack(dv_video_recdate, c, &buf[j+38]); yading@11: dv_write_pack(dv_video_rectime, c, &buf[j+46]); yading@11: } yading@11: } yading@11: yading@11: /* DV VAUX: 4th, 5th and 6th 3DIFs */ yading@11: for (j = 80*3 + 3; j < 80*6; j += 80) { yading@11: dv_write_pack(dv_video_recdate, c, &buf[j+5*2]); yading@11: dv_write_pack(dv_video_rectime, c, &buf[j+5*3]); yading@11: dv_write_pack(dv_video_recdate, c, &buf[j+5*11]); yading@11: dv_write_pack(dv_video_rectime, c, &buf[j+5*12]); yading@11: } yading@11: } yading@11: } yading@11: yading@11: /* yading@11: * The following 3 functions constitute our interface to the world yading@11: */ yading@11: yading@11: static int dv_assemble_frame(DVMuxContext *c, AVStream* st, yading@11: uint8_t* data, int data_size, uint8_t** frame) yading@11: { yading@11: int i, reqasize; yading@11: yading@11: *frame = &c->frame_buf[0]; yading@11: reqasize = 4 * dv_audio_frame_size(c->sys, c->frames); yading@11: yading@11: switch (st->codec->codec_type) { yading@11: case AVMEDIA_TYPE_VIDEO: yading@11: /* FIXME: we have to have more sensible approach than this one */ yading@11: if (c->has_video) yading@11: av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames); yading@11: yading@11: memcpy(*frame, data, c->sys->frame_size); yading@11: c->has_video = 1; yading@11: break; yading@11: case AVMEDIA_TYPE_AUDIO: yading@11: for (i = 0; i < c->n_ast && st != c->ast[i]; i++); yading@11: yading@11: /* FIXME: we have to have more sensible approach than this one */ yading@11: if (av_fifo_size(c->audio_data[i]) + data_size >= 100*MAX_AUDIO_FRAME_SIZE) yading@11: av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames); yading@11: av_fifo_generic_write(c->audio_data[i], data, data_size, NULL); yading@11: yading@11: /* Let us see if we've got enough audio for one DV frame. */ yading@11: c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i); yading@11: yading@11: break; yading@11: default: yading@11: break; yading@11: } yading@11: yading@11: /* Let us see if we have enough data to construct one DV frame. */ yading@11: if (c->has_video == 1 && c->has_audio + 1 == 1 << c->n_ast) { yading@11: dv_inject_metadata(c, *frame); yading@11: c->has_audio = 0; yading@11: for (i=0; i < c->n_ast; i++) { yading@11: dv_inject_audio(c, i, *frame); yading@11: av_fifo_drain(c->audio_data[i], reqasize); yading@11: c->has_audio |= ((reqasize <= av_fifo_size(c->audio_data[i])) << i); yading@11: } yading@11: yading@11: c->has_video = 0; yading@11: yading@11: c->frames++; yading@11: yading@11: return c->sys->frame_size; yading@11: } yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: static DVMuxContext* dv_init_mux(AVFormatContext* s) yading@11: { yading@11: DVMuxContext *c = s->priv_data; yading@11: AVStream *vst = NULL; yading@11: AVDictionaryEntry *t; yading@11: int i; yading@11: yading@11: /* we support at most 1 video and 2 audio streams */ yading@11: if (s->nb_streams > 3) yading@11: return NULL; yading@11: yading@11: c->n_ast = 0; yading@11: c->ast[0] = c->ast[1] = NULL; yading@11: yading@11: /* We have to sort out where audio and where video stream is */ yading@11: for (i=0; inb_streams; i++) { yading@11: switch (s->streams[i]->codec->codec_type) { yading@11: case AVMEDIA_TYPE_VIDEO: yading@11: if (vst) return NULL; yading@11: vst = s->streams[i]; yading@11: break; yading@11: case AVMEDIA_TYPE_AUDIO: yading@11: if (c->n_ast > 1) return NULL; yading@11: c->ast[c->n_ast++] = s->streams[i]; yading@11: break; yading@11: default: yading@11: goto bail_out; yading@11: } yading@11: } yading@11: yading@11: /* Some checks -- DV format is very picky about its incoming streams */ yading@11: if (!vst || vst->codec->codec_id != AV_CODEC_ID_DVVIDEO) yading@11: goto bail_out; yading@11: for (i=0; in_ast; i++) { yading@11: if (c->ast[i] && (c->ast[i]->codec->codec_id != AV_CODEC_ID_PCM_S16LE || yading@11: c->ast[i]->codec->sample_rate != 48000 || yading@11: c->ast[i]->codec->channels != 2)) yading@11: goto bail_out; yading@11: } yading@11: c->sys = avpriv_dv_codec_profile(vst->codec); yading@11: if (!c->sys) yading@11: goto bail_out; yading@11: yading@11: if ((c->n_ast > 1) && (c->sys->n_difchan < 2)) { yading@11: /* only 1 stereo pair is allowed in 25Mbps mode */ yading@11: goto bail_out; yading@11: } yading@11: yading@11: /* Ok, everything seems to be in working order */ yading@11: c->frames = 0; yading@11: c->has_audio = 0; yading@11: c->has_video = 0; yading@11: if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) yading@11: c->start_time = ff_iso8601_to_unix_time(t->value); yading@11: yading@11: for (i=0; i < c->n_ast; i++) { yading@11: if (c->ast[i] && !(c->audio_data[i]=av_fifo_alloc(100*MAX_AUDIO_FRAME_SIZE))) { yading@11: while (i > 0) { yading@11: i--; yading@11: av_fifo_free(c->audio_data[i]); yading@11: } yading@11: goto bail_out; yading@11: } yading@11: } yading@11: yading@11: return c; yading@11: yading@11: bail_out: yading@11: return NULL; yading@11: } yading@11: yading@11: static void dv_delete_mux(DVMuxContext *c) yading@11: { yading@11: int i; yading@11: for (i=0; i < c->n_ast; i++) yading@11: av_fifo_free(c->audio_data[i]); yading@11: } yading@11: yading@11: static int dv_write_header(AVFormatContext *s) yading@11: { yading@11: AVRational rate; yading@11: DVMuxContext *dvc = s->priv_data; yading@11: AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0); yading@11: yading@11: if (!dv_init_mux(s)) { yading@11: av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n" yading@11: "Make sure that you supply exactly two streams:\n" yading@11: " video: 25fps or 29.97fps, audio: 2ch/48kHz/PCM\n" yading@11: " (50Mbps allows an optional second audio stream)\n"); yading@11: return -1; yading@11: } yading@11: rate.num = dvc->sys->ltc_divisor; yading@11: rate.den = 1; yading@11: if (!tcr) { // no global timecode, look into the streams yading@11: int i; yading@11: for (i = 0; i < s->nb_streams; i++) { yading@11: tcr = av_dict_get(s->streams[i]->metadata, "timecode", NULL, 0); yading@11: if (tcr) yading@11: break; yading@11: } yading@11: } yading@11: if (tcr && av_timecode_init_from_string(&dvc->tc, rate, tcr->value, s) >= 0) yading@11: return 0; yading@11: return av_timecode_init(&dvc->tc, rate, 0, 0, s); yading@11: } yading@11: yading@11: static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt) yading@11: { yading@11: uint8_t* frame; yading@11: int fsize; yading@11: yading@11: fsize = dv_assemble_frame(s->priv_data, s->streams[pkt->stream_index], yading@11: pkt->data, pkt->size, &frame); yading@11: if (fsize > 0) { yading@11: avio_write(s->pb, frame, fsize); yading@11: } yading@11: return 0; yading@11: } yading@11: yading@11: /* yading@11: * We might end up with some extra A/V data without matching counterpart. yading@11: * E.g. video data without enough audio to write the complete frame. yading@11: * Currently we simply drop the last frame. I don't know whether this yading@11: * is the best strategy of all yading@11: */ yading@11: static int dv_write_trailer(struct AVFormatContext *s) yading@11: { yading@11: dv_delete_mux(s->priv_data); yading@11: return 0; yading@11: } yading@11: yading@11: AVOutputFormat ff_dv_muxer = { yading@11: .name = "dv", yading@11: .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"), yading@11: .extensions = "dv", yading@11: .priv_data_size = sizeof(DVMuxContext), yading@11: .audio_codec = AV_CODEC_ID_PCM_S16LE, yading@11: .video_codec = AV_CODEC_ID_DVVIDEO, yading@11: .write_header = dv_write_header, yading@11: .write_packet = dv_write_packet, yading@11: .write_trailer = dv_write_trailer, yading@11: };