diff options
Diffstat (limited to 'media/ffvpx/libavutil/timecode.c')
| -rw-r--r-- | media/ffvpx/libavutil/timecode.c | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/timecode.c b/media/ffvpx/libavutil/timecode.c new file mode 100644 index 0000000000..b93f05b4b8 --- /dev/null +++ b/media/ffvpx/libavutil/timecode.c @@ -0,0 +1,265 @@ +/* + * Copyright (c) 2006 Smartjog S.A.S, Baptiste Coudurier <baptiste.coudurier@gmail.com> + * Copyright (c) 2011-2012 Smartjog S.A.S, Clément Bœsch <clement.boesch@smartjog.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 + */ + +/** + * @file + * Timecode helpers + * @see https://en.wikipedia.org/wiki/SMPTE_time_code + * @see http://www.dropframetimecode.org + */ + +#include <stdio.h> +#include "common.h" +#include "timecode.h" +#include "log.h" +#include "error.h" + +int av_timecode_adjust_ntsc_framenum2(int framenum, int fps) +{ + /* only works for multiples of NTSC 29.97 */ + int drop_frames = 0; + int d, m, frames_per_10mins; + + if (fps && fps % 30 == 0) { + drop_frames = fps / 30 * 2; + frames_per_10mins = fps / 30 * 17982; + } else + return framenum; + + d = framenum / frames_per_10mins; + m = framenum % frames_per_10mins; + + return framenum + 9U * drop_frames * d + drop_frames * ((m - drop_frames) / (frames_per_10mins / 10)); +} + +uint32_t av_timecode_get_smpte_from_framenum(const AVTimecode *tc, int framenum) +{ + unsigned fps = tc->fps; + int drop = !!(tc->flags & AV_TIMECODE_FLAG_DROPFRAME); + int hh, mm, ss, ff; + + framenum += tc->start; + if (drop) + framenum = av_timecode_adjust_ntsc_framenum2(framenum, tc->fps); + ff = framenum % fps; + ss = framenum / fps % 60; + mm = framenum / (fps*60) % 60; + hh = framenum / (fps*3600) % 24; + return av_timecode_get_smpte(tc->rate, drop, hh, mm, ss, ff); +} + +uint32_t av_timecode_get_smpte(AVRational rate, int drop, int hh, int mm, int ss, int ff) +{ + uint32_t tc = 0; + + /* For SMPTE 12-M timecodes, frame count is a special case if > 30 FPS. + See SMPTE ST 12-1:2014 Sec 12.1 for more info. */ + if (av_cmp_q(rate, (AVRational) {30, 1}) == 1) { + if (ff % 2 == 1) { + if (av_cmp_q(rate, (AVRational) {50, 1}) == 0) + tc |= (1 << 7); + else + tc |= (1 << 23); + } + ff /= 2; + } + + hh = hh % 24; + mm = av_clip(mm, 0, 59); + ss = av_clip(ss, 0, 59); + ff = ff % 40; + + tc |= drop << 30; + tc |= (ff / 10) << 28; + tc |= (ff % 10) << 24; + tc |= (ss / 10) << 20; + tc |= (ss % 10) << 16; + tc |= (mm / 10) << 12; + tc |= (mm % 10) << 8; + tc |= (hh / 10) << 4; + tc |= (hh % 10); + + return tc; +} + +char *av_timecode_make_string(const AVTimecode *tc, char *buf, int framenum) +{ + int fps = tc->fps; + int drop = tc->flags & AV_TIMECODE_FLAG_DROPFRAME; + int hh, mm, ss, ff, ff_len, neg = 0; + + framenum += tc->start; + if (drop) + framenum = av_timecode_adjust_ntsc_framenum2(framenum, fps); + if (framenum < 0) { + framenum = -framenum; + neg = tc->flags & AV_TIMECODE_FLAG_ALLOWNEGATIVE; + } + ff = framenum % fps; + ss = framenum / fps % 60; + mm = framenum / (fps*60LL) % 60; + hh = framenum / (fps*3600LL); + if (tc->flags & AV_TIMECODE_FLAG_24HOURSMAX) + hh = hh % 24; + ff_len = fps > 10000 ? 5 : fps > 1000 ? 4 : fps > 100 ? 3 : fps > 10 ? 2 : 1; + snprintf(buf, AV_TIMECODE_STR_SIZE, "%s%02d:%02d:%02d%c%0*d", + neg ? "-" : "", + hh, mm, ss, drop ? ';' : ':', ff_len, ff); + return buf; +} + +static unsigned bcd2uint(uint8_t bcd) +{ + unsigned low = bcd & 0xf; + unsigned high = bcd >> 4; + if (low > 9 || high > 9) + return 0; + return low + 10*high; +} + +char *av_timecode_make_smpte_tc_string2(char *buf, AVRational rate, uint32_t tcsmpte, int prevent_df, int skip_field) +{ + unsigned hh = bcd2uint(tcsmpte & 0x3f); // 6-bit hours + unsigned mm = bcd2uint(tcsmpte>>8 & 0x7f); // 7-bit minutes + unsigned ss = bcd2uint(tcsmpte>>16 & 0x7f); // 7-bit seconds + unsigned ff = bcd2uint(tcsmpte>>24 & 0x3f); // 6-bit frames + unsigned drop = tcsmpte & 1<<30 && !prevent_df; // 1-bit drop if not arbitrary bit + + if (av_cmp_q(rate, (AVRational) {30, 1}) == 1) { + ff <<= 1; + if (!skip_field) { + if (av_cmp_q(rate, (AVRational) {50, 1}) == 0) + ff += !!(tcsmpte & 1 << 7); + else + ff += !!(tcsmpte & 1 << 23); + } + } + + snprintf(buf, AV_TIMECODE_STR_SIZE, "%02u:%02u:%02u%c%02u", + hh, mm, ss, drop ? ';' : ':', ff); + return buf; + +} + +char *av_timecode_make_smpte_tc_string(char *buf, uint32_t tcsmpte, int prevent_df) +{ + return av_timecode_make_smpte_tc_string2(buf, (AVRational){30, 1}, tcsmpte, prevent_df, 1); +} + +char *av_timecode_make_mpeg_tc_string(char *buf, uint32_t tc25bit) +{ + snprintf(buf, AV_TIMECODE_STR_SIZE, + "%02"PRIu32":%02"PRIu32":%02"PRIu32"%c%02"PRIu32, + tc25bit>>19 & 0x1f, // 5-bit hours + tc25bit>>13 & 0x3f, // 6-bit minutes + tc25bit>>6 & 0x3f, // 6-bit seconds + tc25bit & 1<<24 ? ';' : ':', // 1-bit drop flag + tc25bit & 0x3f); // 6-bit frames + return buf; +} + +static int check_fps(int fps) +{ + int i; + static const int supported_fps[] = { + 24, 25, 30, 48, 50, 60, 100, 120, 150, + }; + + for (i = 0; i < FF_ARRAY_ELEMS(supported_fps); i++) + if (fps == supported_fps[i]) + return 0; + return -1; +} + +static int check_timecode(void *log_ctx, AVTimecode *tc) +{ + if ((int)tc->fps <= 0) { + av_log(log_ctx, AV_LOG_ERROR, "Valid timecode frame rate must be specified. Minimum value is 1\n"); + return AVERROR(EINVAL); + } + if ((tc->flags & AV_TIMECODE_FLAG_DROPFRAME) && tc->fps % 30 != 0) { + av_log(log_ctx, AV_LOG_ERROR, "Drop frame is only allowed with multiples of 30000/1001 FPS\n"); + return AVERROR(EINVAL); + } + if (check_fps(tc->fps) < 0) { + av_log(log_ctx, AV_LOG_WARNING, "Using non-standard frame rate %d/%d\n", + tc->rate.num, tc->rate.den); + } + return 0; +} + +static int fps_from_frame_rate(AVRational rate) +{ + if (!rate.den || !rate.num) + return -1; + return (rate.num + rate.den/2) / rate.den; +} + +int av_timecode_check_frame_rate(AVRational rate) +{ + return check_fps(fps_from_frame_rate(rate)); +} + +int av_timecode_init(AVTimecode *tc, AVRational rate, int flags, int frame_start, void *log_ctx) +{ + memset(tc, 0, sizeof(*tc)); + tc->start = frame_start; + tc->flags = flags; + tc->rate = rate; + tc->fps = fps_from_frame_rate(rate); + return check_timecode(log_ctx, tc); +} + +int av_timecode_init_from_components(AVTimecode *tc, AVRational rate, int flags, int hh, int mm, int ss, int ff, void *log_ctx) +{ + int ret; + + memset(tc, 0, sizeof(*tc)); + tc->flags = flags; + tc->rate = rate; + tc->fps = fps_from_frame_rate(rate); + + ret = check_timecode(log_ctx, tc); + if (ret < 0) + return ret; + + tc->start = (hh*3600 + mm*60 + ss) * tc->fps + ff; + if (tc->flags & AV_TIMECODE_FLAG_DROPFRAME) { /* adjust frame number */ + int tmins = 60*hh + mm; + tc->start -= (tc->fps / 30 * 2) * (tmins - tmins/10); + } + return 0; +} + +int av_timecode_init_from_string(AVTimecode *tc, AVRational rate, const char *str, void *log_ctx) +{ + char c; + int hh, mm, ss, ff, flags; + + if (sscanf(str, "%d:%d:%d%c%d", &hh, &mm, &ss, &c, &ff) != 5) { + av_log(log_ctx, AV_LOG_ERROR, "Unable to parse timecode, " + "syntax: hh:mm:ss[:;.]ff\n"); + return AVERROR_INVALIDDATA; + } + flags = c != ':' ? AV_TIMECODE_FLAG_DROPFRAME : 0; // drop if ';', '.', ... + + return av_timecode_init_from_components(tc, rate, flags, hh, mm, ss, ff, log_ctx); +} |