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* General DV muxer/demuxer
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* Copyright (c) 2003 Roman Shaposhnik
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* Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
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* of DV technical info.
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* Copyright (c) 2002 Fabrice Bellard.
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* 50 Mbps (DVCPRO50) support
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* Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
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* This file is part of FFmpeg.
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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const DVprofile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
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int n_ast; /* Number of stereo audio streams (up to 2) */
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AVStream *ast[2]; /* Stereo audio streams */
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AVFifoBuffer audio_data[2]; /* Fifo for storing excessive amounts of PCM */
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int frames; /* Number of a current frame */
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time_t start_time; /* Start time of recording */
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int has_audio; /* frame under contruction has audio */
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int has_video; /* frame under contruction has video */
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uint8_t frame_buf[DV_MAX_FRAME_SIZE]; /* frame under contruction */
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static const int dv_aaux_packs_dist[12][9] = {
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{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
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{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
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{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
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{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
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{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
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{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
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{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
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{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
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{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
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{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
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{ 0xff, 0xff, 0xff, 0x50, 0x51, 0x52, 0x53, 0xff, 0xff },
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{ 0x50, 0x51, 0x52, 0x53, 0xff, 0xff, 0xff, 0xff, 0xff },
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static int dv_audio_frame_size(const DVprofile* sys, int frame)
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return sys->audio_samples_dist[frame % (sizeof(sys->audio_samples_dist)/
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sizeof(sys->audio_samples_dist[0]))];
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static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* buf, ...)
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buf[0] = (uint8_t)pack_id;
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ct = (time_t)(c->frames / ((float)c->sys->frame_rate /
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(float)c->sys->frame_rate_base));
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* LTC drop-frame frame counter drops two frames (0 and 1) every
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* minute, unless it is exactly divisible by 10
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ltc_frame = (c->frames + 2*ct/60 - 2*ct/600) % c->sys->ltc_divisor;
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buf[1] = (0 << 7) | /* Color fame: 0 - unsync; 1 - sync mode */
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(1 << 6) | /* Drop frame timecode: 0 - nondrop; 1 - drop */
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((ltc_frame / 10) << 4) | /* Tens of frames */
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(ltc_frame % 10); /* Units of frames */
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buf[2] = (1 << 7) | /* Biphase mark polarity correction: 0 - even; 1 - odd */
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((tc.tm_sec / 10) << 4) | /* Tens of seconds */
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(tc.tm_sec % 10); /* Units of seconds */
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buf[3] = (1 << 7) | /* Binary group flag BGF0 */
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((tc.tm_min / 10) << 4) | /* Tens of minutes */
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(tc.tm_min % 10); /* Units of minutes */
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buf[4] = (1 << 7) | /* Binary group flag BGF2 */
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(1 << 6) | /* Binary group flag BGF1 */
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((tc.tm_hour / 10) << 4) | /* Tens of hours */
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(tc.tm_hour % 10); /* Units of hours */
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case dv_audio_source: /* AAUX source pack */
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buf[1] = (1 << 7) | /* locked mode -- SMPTE only supports locked mode */
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(1 << 6) | /* reserved -- always 1 */
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(dv_audio_frame_size(c->sys, c->frames) -
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c->sys->audio_min_samples[0]);
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buf[2] = (0 << 7) | /* multi-stereo */
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(0 << 5) | /* #of audio channels per block: 0 -- 1 channel */
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(0 << 4) | /* pair bit: 0 -- one pair of channels */
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!!va_arg(ap, int); /* audio mode */
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buf[3] = (1 << 7) | /* res */
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(1 << 6) | /* multi-language flag */
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(c->sys->dsf << 5) | /* system: 60fields/50fields */
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(c->sys->n_difchan & 2); /* definition: 0 -- 25Mbps, 2 -- 50Mbps */
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buf[4] = (1 << 7) | /* emphasis: 1 -- off */
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(0 << 6) | /* emphasis time constant: 0 -- reserved */
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(0 << 3) | /* frequency: 0 -- 48Khz, 1 -- 44,1Khz, 2 -- 32Khz */
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0; /* quantization: 0 -- 16bit linear, 1 -- 12bit nonlinear */
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case dv_audio_control:
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buf[1] = (0 << 6) | /* copy protection: 0 -- unrestricted */
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(1 << 4) | /* input source: 1 -- digital input */
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(3 << 2) | /* compression: 3 -- no information */
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0; /* misc. info/SMPTE emphasis off */
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buf[2] = (1 << 7) | /* recording start point: 1 -- no */
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(1 << 6) | /* recording end point: 1 -- no */
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(1 << 3) | /* recording mode: 1 -- original */
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buf[3] = (1 << 7) | /* direction: 1 -- forward */
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(c->sys->pix_fmt == PIX_FMT_YUV420P ? 0x20 : /* speed */
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c->sys->ltc_divisor*4);
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buf[4] = (1 << 7) | /* reserved -- always 1 */
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0x7f; /* genre category */
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case dv_audio_recdate:
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case dv_video_recdate: /* VAUX recording date */
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ct = c->start_time + (time_t)(c->frames /
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((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
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buf[1] = 0xff; /* ds, tm, tens of time zone, units of time zone */
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/* 0xff is very likely to be "unknown" */
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buf[2] = (3 << 6) | /* reserved -- always 1 */
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((tc.tm_mday / 10) << 4) | /* Tens of day */
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(tc.tm_mday % 10); /* Units of day */
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buf[3] = /* we set high 4 bits to 0, shouldn't we set them to week? */
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((tc.tm_mon / 10) << 4) | /* Tens of month */
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(tc.tm_mon % 10); /* Units of month */
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buf[4] = (((tc.tm_year % 100) / 10) << 4) | /* Tens of year */
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(tc.tm_year % 10); /* Units of year */
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case dv_audio_rectime: /* AAUX recording time */
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case dv_video_rectime: /* VAUX recording time */
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ct = c->start_time + (time_t)(c->frames /
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((float)c->sys->frame_rate / (float)c->sys->frame_rate_base));
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buf[1] = (3 << 6) | /* reserved -- always 1 */
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0x3f; /* tens of frame, units of frame: 0x3f - "unknown" ? */
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buf[2] = (1 << 7) | /* reserved -- always 1 */
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((tc.tm_sec / 10) << 4) | /* Tens of seconds */
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(tc.tm_sec % 10); /* Units of seconds */
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buf[3] = (1 << 7) | /* reserved -- always 1 */
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((tc.tm_min / 10) << 4) | /* Tens of minutes */
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(tc.tm_min % 10); /* Units of minutes */
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buf[4] = (3 << 6) | /* reserved -- always 1 */
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((tc.tm_hour / 10) << 4) | /* Tens of hours */
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(tc.tm_hour % 10); /* Units of hours */
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buf[1] = buf[2] = buf[3] = buf[4] = 0xff;
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static void dv_inject_audio(DVMuxContext *c, int channel, uint8_t* frame_ptr)
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int i, j, d, of, size;
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size = 4 * dv_audio_frame_size(c->sys, c->frames);
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frame_ptr += channel * c->sys->difseg_size * 150 * 80;
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for (i = 0; i < c->sys->difseg_size; i++) {
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frame_ptr += 6 * 80; /* skip DIF segment header */
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for (j = 0; j < 9; j++) {
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dv_write_pack(dv_aaux_packs_dist[i][j], c, &frame_ptr[3], i >= c->sys->difseg_size/2);
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for (d = 8; d < 80; d+=2) {
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of = c->sys->audio_shuffle[i][j] + (d - 8)/2 * c->sys->audio_stride;
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frame_ptr[d] = av_fifo_peek(&c->audio_data[channel], of*2+1); // FIXME: may be we have to admit
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frame_ptr[d+1] = av_fifo_peek(&c->audio_data[channel], of*2); // that DV is a big endian PCM
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frame_ptr += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
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static void dv_inject_metadata(DVMuxContext *c, uint8_t* frame)
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for (buf = frame; buf < frame + c->sys->frame_size; buf += 150 * 80) {
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/* DV subcode: 2nd and 3d DIFs */
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for (j = 80; j < 80 * 3; j += 80) {
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for (k = 6; k < 6 * 8; k += 8)
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dv_write_pack(dv_timecode, c, &buf[j+k]);
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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 ? */
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dv_write_pack(dv_video_recdate, c, &buf[j+14]);
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dv_write_pack(dv_video_rectime, c, &buf[j+22]);
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dv_write_pack(dv_video_recdate, c, &buf[j+38]);
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dv_write_pack(dv_video_rectime, c, &buf[j+46]);
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/* DV VAUX: 4th, 5th and 6th 3DIFs */
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for (j = 80*3 + 3; j < 80*6; j += 80) {
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dv_write_pack(dv_video_recdate, c, &buf[j+5*2]);
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dv_write_pack(dv_video_rectime, c, &buf[j+5*3]);
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dv_write_pack(dv_video_recdate, c, &buf[j+5*11]);
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dv_write_pack(dv_video_rectime, c, &buf[j+5*12]);
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* The following 3 functions constitute our interface to the world
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int dv_assemble_frame(DVMuxContext *c, AVStream* st,
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const uint8_t* data, int data_size, uint8_t** frame)
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*frame = &c->frame_buf[0];
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reqasize = 4 * dv_audio_frame_size(c->sys, c->frames);
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switch (st->codec->codec_type) {
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case CODEC_TYPE_VIDEO:
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/* FIXME: we have to have more sensible approach than this one */
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av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient audio data or severe sync problem.\n", c->frames);
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memcpy(*frame, data, c->sys->frame_size);
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case CODEC_TYPE_AUDIO:
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for (i = 0; i < c->n_ast && st != c->ast[i]; i++);
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/* FIXME: we have to have more sensible approach than this one */
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if (av_fifo_size(&c->audio_data[i]) + data_size >= 100*AVCODEC_MAX_AUDIO_FRAME_SIZE)
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av_log(st->codec, AV_LOG_ERROR, "Can't process DV frame #%d. Insufficient video data or severe sync problem.\n", c->frames);
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av_fifo_write(&c->audio_data[i], data, data_size);
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/* Lets see if we've got enough audio for one DV frame */
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c->has_audio |= ((reqasize <= av_fifo_size(&c->audio_data[i])) << i);
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/* Lets see if we have enough data to construct one DV frame */
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if (c->has_video == 1 && c->has_audio + 1 == 1<<c->n_ast) {
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dv_inject_metadata(c, *frame);
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for (i=0; i<c->n_ast; i++) {
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dv_inject_audio(c, i, *frame);
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av_fifo_drain(&c->audio_data[i], reqasize);
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return c->sys->frame_size;
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DVMuxContext* dv_init_mux(AVFormatContext* s)
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DVMuxContext *c = (DVMuxContext *)s->priv_data;
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AVStream *vst = NULL;
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/* we support at most 1 video and 2 audio streams */
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if (s->nb_streams > 3)
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c->ast[0] = c->ast[1] = NULL;
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/* We have to sort out where audio and where video stream is */
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for (i=0; i<s->nb_streams; i++) {
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switch (s->streams[i]->codec->codec_type) {
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case CODEC_TYPE_VIDEO:
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case CODEC_TYPE_AUDIO:
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c->ast[c->n_ast++] = s->streams[i];
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/* Some checks -- DV format is very picky about its incoming streams */
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if (!vst || vst->codec->codec_id != CODEC_ID_DVVIDEO)
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for (i=0; i<c->n_ast; i++) {
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if (c->ast[i] && (c->ast[i]->codec->codec_id != CODEC_ID_PCM_S16LE ||
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c->ast[i]->codec->sample_rate != 48000 ||
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c->ast[i]->codec->channels != 2))
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c->sys = dv_codec_profile(vst->codec);
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if((c->n_ast > 1) && (c->sys->n_difchan < 2)) {
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/* only 1 stereo pair is allowed in 25Mbps mode */
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/* Ok, everything seems to be in working order */
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c->start_time = (time_t)s->timestamp;
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for (i=0; i<c->n_ast; i++) {
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if (c->ast[i] && av_fifo_init(&c->audio_data[i], 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0) {
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av_fifo_free(&c->audio_data[i]);
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void dv_delete_mux(DVMuxContext *c)
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for (i=0; i < c->n_ast; i++)
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av_fifo_free(&c->audio_data[i]);
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static int dv_write_header(AVFormatContext *s)
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if (!dv_init_mux(s)) {
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av_log(s, AV_LOG_ERROR, "Can't initialize DV format!\n"
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"Make sure that you supply exactly two streams:\n"
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" video: 25fps or 29.97fps, audio: 2ch/48Khz/PCM\n"
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" (50Mbps allows an optional second audio stream)\n");
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static int dv_write_packet(struct AVFormatContext *s, AVPacket *pkt)
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fsize = dv_assemble_frame((DVMuxContext *)s->priv_data, s->streams[pkt->stream_index],
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pkt->data, pkt->size, &frame);
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put_buffer(&s->pb, frame, fsize);
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put_flush_packet(&s->pb);
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* We might end up with some extra A/V data without matching counterpart.
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* E.g. video data without enough audio to write the complete frame.
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* Currently we simply drop the last frame. I don't know whether this
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* is the best strategy of all
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static int dv_write_trailer(struct AVFormatContext *s)
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dv_delete_mux((DVMuxContext *)s->priv_data);
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#endif /* CONFIG_MUXERS */
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#ifdef CONFIG_DV_MUXER
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AVOutputFormat dv_muxer = {
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sizeof(DVMuxContext),
added
removed
ffmpeg/libavformat/dvenc.c
