| /* | |
| * 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 "libavutil/time_internal.h" | |
| #include "avformat.h" | |
| #include "libavcodec/dv_profile.h" | |
| #include "libavcodec/dv.h" | |
| #include "dv.h" | |
| #include "mux.h" | |
| #include "libavutil/avassert.h" | |
| #include "libavutil/fifo.h" | |
| #include "libavutil/mathematics.h" | |
| #include "libavutil/intreadwrite.h" | |
| #include "libavutil/pixdesc.h" | |
| #include "libavutil/timecode.h" | |
| #define MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32-bit audio | |
| typedef struct DVMuxContext { | |
| AVClass *av_class; | |
| const AVDVProfile* sys; /* current DV profile, e.g.: 525/60, 625/50 */ | |
| int n_ast; /* number of stereo audio streams (up to 2) */ | |
| AVStream *ast[4]; /* stereo audio streams */ | |
| AVFifo *audio_data[4]; /* FIFO for storing excessive amounts of PCM */ | |
| int frames; /* current frame number */ | |
| int64_t start_time; /* recording start time */ | |
| int has_audio; /* frame under construction has audio */ | |
| int has_video; /* frame under construction has video */ | |
| uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under construction */ | |
| AVTimecode tc; /* timecode context */ | |
| } DVMuxContext; | |
| 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 void brktimegm(time_t secs, struct tm *tm) | |
| { | |
| tm = gmtime_r(&secs, tm); | |
| tm->tm_year += 1900; /* unlike gmtime_r we store complete year here */ | |
| tm->tm_mon += 1; /* unlike gmtime_r tm_mon is from 1 to 12 */ | |
| } | |
| static int dv_audio_frame_size(const AVDVProfile* sys, int frame, int sample_rate) | |
| { | |
| if ((sys->time_base.den == 25 || sys->time_base.den == 50) && sys->time_base.num == 1) { | |
| if (sample_rate == 32000) return 1280; | |
| else if (sample_rate == 44100) return 1764; | |
| else return 1920; | |
| } | |
| av_assert0(sample_rate == 48000); | |
| return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist) / | |
| sizeof(sys->audio_samples_dist[0]))]; | |
| } | |
| static int dv_write_pack(enum DVPackType pack_id, DVMuxContext *c, uint8_t* buf, int channel, int seq) | |
| { | |
| struct tm tc; | |
| time_t ct; | |
| uint32_t timecode; | |
| int audio_type = 0; | |
| buf[0] = (uint8_t)pack_id; | |
| switch (pack_id) { | |
| case DV_TIMECODE: | |
| timecode = av_timecode_get_smpte_from_framenum(&c->tc, c->frames); | |
| timecode |= 1<<23 | 1<<15 | 1<<7 | 1<<6; // biphase and binary group flags | |
| AV_WB32(buf + 1, timecode); | |
| break; | |
| case DV_AUDIO_SOURCE: /* AAUX source pack */ | |
| if (c->ast[channel]->codecpar->sample_rate == 44100) { | |
| audio_type = 1; | |
| } else if (c->ast[channel]->codecpar->sample_rate == 32000) | |
| audio_type = 2; | |
| 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->ast[channel]->codecpar->sample_rate) - | |
| c->sys->audio_min_samples[audio_type]); | |
| /* # 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 */ | |
| (seq >= c->sys->difseg_size/2); /* audio mode (1st or 2nd channel) */ | |
| buf[3] = (1 << 7) | /* res */ | |
| (1 << 6) | /* multi-language flag */ | |
| (c->sys->dsf << 5) | /* system: 60fields/50fields */ | |
| (DV_PROFILE_IS_HD(c->sys) ? 0x3 : c->sys->video_stype ? 2 : 0); /* stype */ | |
| buf[4] = (1 << 7) | /* emphasis: 1 -- off */ | |
| (0 << 6) | /* emphasis time constant: 0 -- reserved */ | |
| (audio_type << 3) | /* frequency: 0 -- 48kHz, 1 -- 44,1kHz, 2 -- 32kHz */ | |
| 0; /* quantization: 0 -- 16-bit linear, 1 -- 12-bit nonlinear */ | |
| 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 == AV_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, c->ast[channel]->codecpar->sample_rate); | |
| 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], channel, i); | |
| 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; | |
| // FIXME: maybe we have to admit that DV is a big-endian PCM | |
| av_fifo_peek(c->audio_data[channel], frame_ptr + d, 2, of * 2); | |
| FFSWAP(uint8_t, frame_ptr[d], frame_ptr[d + 1]); | |
| } | |
| 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; | |
| int seq = 0; | |
| for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80, seq++) { | |
| /* 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], 0, seq); | |
| 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], 0, seq); | |
| dv_write_pack(DV_VIDEO_RECTIME, c, &buf[j+22], 0, seq); | |
| dv_write_pack(DV_VIDEO_RECDATE, c, &buf[j+38], 0, seq); | |
| dv_write_pack(DV_VIDEO_RECTIME, c, &buf[j+46], 0, seq); | |
| } | |
| } | |
| /* 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], 0, seq); | |
| dv_write_pack(DV_VIDEO_RECTIME, c, &buf[j+5* 3], 0, seq); | |
| dv_write_pack(DV_VIDEO_RECDATE, c, &buf[j+5*11], 0, seq); | |
| dv_write_pack(DV_VIDEO_RECTIME, c, &buf[j+5*12], 0, seq); | |
| } | |
| } | |
| } | |
| /* | |
| * The following 3 functions constitute our interface to the world | |
| */ | |
| static int dv_assemble_frame(AVFormatContext *s, | |
| DVMuxContext *c, AVStream* st, | |
| const uint8_t *data, int data_size, uint8_t **frame) | |
| { | |
| int i, reqasize; | |
| *frame = &c->frame_buf[0]; | |
| switch (st->codecpar->codec_type) { | |
| case AVMEDIA_TYPE_VIDEO: | |
| /* FIXME: we have to have more sensible approach than this one */ | |
| if (c->has_video) { | |
| av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames); | |
| return AVERROR(EINVAL); | |
| } | |
| if (data_size != c->sys->frame_size) { | |
| av_log(s, AV_LOG_ERROR, "Unexpected frame size, %d != %d\n", | |
| data_size, c->sys->frame_size); | |
| return AVERROR(ENOSYS); | |
| } | |
| 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_can_write(c->audio_data[i]) < data_size) { | |
| av_log(s, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames); | |
| return AVERROR(EINVAL); | |
| } | |
| av_fifo_write(c->audio_data[i], data, data_size); | |
| reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, st->codecpar->sample_rate); | |
| /* Let us see if we've got enough audio for one DV frame. */ | |
| c->has_audio |= ((reqasize <= av_fifo_can_read(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); | |
| reqasize = 4 * dv_audio_frame_size(c->sys, c->frames, c->ast[i]->codecpar->sample_rate); | |
| av_fifo_drain2(c->audio_data[i], reqasize); | |
| c->has_audio |= ((reqasize <= av_fifo_can_read(c->audio_data[i])) << i); | |
| } | |
| c->has_video = 0; | |
| c->frames++; | |
| return c->sys->frame_size; | |
| } | |
| return 0; | |
| } | |
| static int dv_init_mux(AVFormatContext* s) | |
| { | |
| DVMuxContext *c = s->priv_data; | |
| AVStream *vst = NULL; | |
| int i; | |
| if (s->nb_streams > 5) { | |
| av_log(s, AV_LOG_ERROR, | |
| "Invalid number of streams %d, the muxer supports at most 1 video channel and 4 audio channels.\n", | |
| s->nb_streams); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| /* We have to sort out where audio and where video stream is */ | |
| for (i=0; i<s->nb_streams; i++) { | |
| AVStream *st = s->streams[i]; | |
| switch (st->codecpar->codec_type) { | |
| case AVMEDIA_TYPE_VIDEO: | |
| if (vst) { | |
| av_log(s, AV_LOG_ERROR, | |
| "More than one video stream found, only one is accepted.\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| if (st->codecpar->codec_id != AV_CODEC_ID_DVVIDEO) { | |
| av_log(s, AV_LOG_ERROR, | |
| "Invalid codec for video stream, only DVVIDEO is supported.\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| vst = st; | |
| break; | |
| case AVMEDIA_TYPE_AUDIO: | |
| if (c->n_ast > 1) { | |
| av_log(s, AV_LOG_ERROR, | |
| "More than two audio streams found, at most 2 are accepted.\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| /* Some checks -- DV format is very picky about its incoming streams */ | |
| if (st->codecpar->codec_id != AV_CODEC_ID_PCM_S16LE) { | |
| av_log(s, AV_LOG_ERROR, | |
| "Invalid codec for stream %d, only PCM_S16LE is supported\n.", i); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| if (st->codecpar->ch_layout.nb_channels != 2) { | |
| av_log(s, AV_LOG_ERROR, | |
| "Invalid number of audio channels %d for stream %d, only 2 channels are supported\n.", | |
| st->codecpar->ch_layout.nb_channels, i); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| if (st->codecpar->sample_rate != 48000 && | |
| st->codecpar->sample_rate != 44100 && | |
| st->codecpar->sample_rate != 32000) { | |
| av_log(s, AV_LOG_ERROR, | |
| "Invalid audio sample rate %d for stream %d, only 32000, 44100, and 48000 are supported.\n", | |
| st->codecpar->sample_rate, i); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| c->ast[c->n_ast++] = st; | |
| break; | |
| default: | |
| av_log(s, AV_LOG_ERROR, | |
| "Invalid media type for stream %d, only audio and video are supported.\n", i); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| } | |
| if (!vst) { | |
| av_log(s, AV_LOG_ERROR, | |
| "Missing video stream, must be present\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| c->sys = av_dv_codec_profile2(vst->codecpar->width, vst->codecpar->height, | |
| vst->codecpar->format, vst->time_base); | |
| if (!c->sys) { | |
| av_log(s, AV_LOG_ERROR, | |
| "Could not find a valid video profile for size:%dx%d format:%s tb:%d%d\n", | |
| vst->codecpar->width, vst->codecpar->height, | |
| av_get_pix_fmt_name(vst->codecpar->format), | |
| vst->time_base.num, vst->time_base.den); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| if ((c->sys->time_base.den != 25 && c->sys->time_base.den != 50) || c->sys->time_base.num != 1) { | |
| for (i = 0; i < 2; i++) { | |
| if (c->ast[i] && c->ast[i]->codecpar->sample_rate != 48000) { | |
| av_log(s, AV_LOG_ERROR, | |
| "Invalid sample rate %d for audio stream #%d for this video profile, must be 48000.\n", | |
| c->ast[i]->codecpar->sample_rate, i); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| } | |
| } | |
| for (i = 1; i < 2; i++) { | |
| if (((c->n_ast > i) && (c->sys->n_difchan < (2 * i)))) { | |
| const char *mode = c->n_ast > 1 ? "50Mps" : "25Mps"; | |
| av_log(s, AV_LOG_ERROR, | |
| "Invalid number of channels %d, only %d stereo pairs is allowed in %s mode.\n", | |
| c->n_ast, i, mode); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| } | |
| /* Ok, everything seems to be in working order */ | |
| c->frames = 0; | |
| c->has_audio = 0; | |
| c->has_video = 0; | |
| ff_parse_creation_time_metadata(s, &c->start_time, 1); | |
| for (i=0; i < c->n_ast; i++) { | |
| if (!c->ast[i]) | |
| continue; | |
| c->audio_data[i] = av_fifo_alloc2(100 * MAX_AUDIO_FRAME_SIZE, 1, 0); | |
| if (!c->audio_data[i]) { | |
| return AVERROR(ENOMEM); | |
| } | |
| } | |
| return 0; | |
| } | |
| static int dv_write_header(AVFormatContext *s) | |
| { | |
| AVRational rate; | |
| DVMuxContext *dvc = s->priv_data; | |
| AVDictionaryEntry *tcr = av_dict_get(s->metadata, "timecode", NULL, 0); | |
| if (dv_init_mux(s) < 0) { | |
| av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n" | |
| "Make sure that you supply at least two streams:\n" | |
| " video: 25fps or 29.97fps, audio: 2ch/48|44.1|32kHz/PCM\n" | |
| " (50Mbps allows an optional second audio stream)\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| rate.num = dvc->sys->ltc_divisor; | |
| rate.den = 1; | |
| if (!tcr) { // no global timecode, look into the streams | |
| int i; | |
| for (i = 0; i < s->nb_streams; i++) { | |
| tcr = av_dict_get(s->streams[i]->metadata, "timecode", NULL, 0); | |
| if (tcr) | |
| break; | |
| } | |
| } | |
| if (tcr && av_timecode_init_from_string(&dvc->tc, rate, tcr->value, s) >= 0) | |
| return 0; | |
| return av_timecode_init(&dvc->tc, rate, 0, 0, s); | |
| } | |
| static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt) | |
| { | |
| uint8_t* frame; | |
| int fsize; | |
| fsize = dv_assemble_frame(s, s->priv_data, s->streams[pkt->stream_index], | |
| pkt->data, pkt->size, &frame); | |
| if (fsize < 0) { | |
| return fsize; | |
| } | |
| avio_write(s->pb, frame, fsize); | |
| 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 void dv_deinit(AVFormatContext *s) | |
| { | |
| DVMuxContext *c = s->priv_data; | |
| for (int i = 0; i < c->n_ast; i++) | |
| av_fifo_freep2(&c->audio_data[i]); | |
| } | |
| const FFOutputFormat ff_dv_muxer = { | |
| .p.name = "dv", | |
| .p.long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"), | |
| .p.extensions = "dv", | |
| .priv_data_size = sizeof(DVMuxContext), | |
| .p.audio_codec = AV_CODEC_ID_PCM_S16LE, | |
| .p.video_codec = AV_CODEC_ID_DVVIDEO, | |
| .write_header = dv_write_header, | |
| .write_packet = dv_write_packet, | |
| .deinit = dv_deinit, | |
| }; |