| /* |
| * 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 FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; 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 "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 |
| */ |
| |
| 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 CODEC_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 CODEC_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; |
| } |
| |
| 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 CODEC_TYPE_VIDEO: |
| if (vst) return NULL; |
| vst = s->streams[i]; |
| break; |
| case CODEC_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 = 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; |
| } |
| |
| void dv_delete_mux(DVMuxContext *c) |
| { |
| int i; |
| for (i=0; i < c->n_ast; i++) |
| av_fifo_free(c->audio_data[i]); |
| } |
| |
| #if CONFIG_DV_MUXER |
| 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) { |
| put_buffer(s->pb, frame, fsize); |
| put_flush_packet(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 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, |
| }; |
| #endif /* CONFIG_DV_MUXER */ |
