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@@ -33,11 +33,15 @@
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#include "avformat.h"
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#include "internal.h"
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#include "libavcodec/dvdata.h"
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+#include "libavcodec/timecode.h"
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#include "dv.h"
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#include "libavutil/fifo.h"
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#include "libavutil/mathematics.h"
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+#include "libavutil/intreadwrite.h"
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+#include "libavutil/opt.h"
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struct DVMuxContext {
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+ AVClass *av_class;
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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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@@ -47,6 +51,7 @@ struct DVMuxContext {
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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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+ struct ff_timecode tc;
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};
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static const int dv_aaux_packs_dist[12][9] = {
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@@ -75,33 +80,23 @@ static int dv_write_pack(enum dv_pack_type pack_id, DVMuxContext *c, uint8_t* bu
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struct tm tc;
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time_t ct;
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int ltc_frame;
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+ uint32_t timecode;
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va_list ap;
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buf[0] = (uint8_t)pack_id;
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switch (pack_id) {
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case dv_timecode:
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- ct = (time_t)av_rescale_rnd(c->frames, c->sys->time_base.num,
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- c->sys->time_base.den, AV_ROUND_DOWN);
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- brktimegm(ct, &tc);
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/*
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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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*/
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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 frame: 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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+ ltc_frame = c->tc.start + c->frames;
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+ if (c->tc.drop)
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+ ltc_frame = ff_framenum_to_drop_timecode(ltc_frame);
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+ timecode = ff_framenum_to_smtpe_timecode(ltc_frame, c->sys->ltc_divisor,
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+ c->tc.drop);
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+ timecode |= 1<<23 | 1<<15 | 1<<7 | 1<<6; // biphase and binary group flags
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+ AV_WB32(buf + 1, timecode);
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break;
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case dv_audio_source: /* AAUX source pack */
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va_start(ap, buf);
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@@ -371,6 +366,8 @@ static void dv_delete_mux(DVMuxContext *c)
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static int dv_write_header(AVFormatContext *s)
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{
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+ DVMuxContext *dvc = s->priv_data;
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+
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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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@@ -378,6 +375,12 @@ static int dv_write_header(AVFormatContext *s)
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" (50Mbps allows an optional second audio stream)\n");
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return -1;
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}
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+ if (dvc->tc.str) {
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+ dvc->tc.rate.num = dvc->sys->time_base.den;
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+ dvc->tc.rate.den = dvc->sys->time_base.num;
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+ if (ff_init_smtpe_timecode(s, &dvc->tc) < 0)
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+ return -1;
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+ }
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return 0;
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}
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@@ -407,6 +410,16 @@ static int dv_write_trailer(struct AVFormatContext *s)
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return 0;
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}
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+static const AVClass class = {
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+ .class_name = "dv",
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+ .item_name = av_default_item_name,
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+ .version = LIBAVUTIL_VERSION_INT,
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+ .option = (const AVOption[]){
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+ {TIMECODE_OPT(DVMuxContext, AV_OPT_FLAG_ENCODING_PARAM)},
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+ {NULL},
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+ },
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+};
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+
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AVOutputFormat ff_dv_muxer = {
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.name = "dv",
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.long_name = NULL_IF_CONFIG_SMALL("DV video format"),
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@@ -417,4 +430,5 @@ AVOutputFormat ff_dv_muxer = {
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.write_header = dv_write_header,
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.write_packet = dv_write_packet,
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.write_trailer = dv_write_trailer,
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+ .priv_class = &class,
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};
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Clément Bœsch