mirror of https://github.com/FFmpeg/FFmpeg.git
move from dashenc, move DASHTmplId and dash_fill_tmpl_params to dash.c, they will be used by dash demuxer and dash muxer. v2 fixed: 1. rename common file from dashcomm.* to dash.* Suggested-by: Hendrik Leppkes <h.leppkes@gmail.com> v3 fixed: 1. rename header file pre defined 2. add ff_ prefix for the internal API Suggested-by: James Almer <jamrial@gmail.com> Suggested-by: Timo Rothenpieler <timo@rothenpieler.org> Reviewed-by: wm4 <nfxjfg@googlemail.com> Signed-off-by: Steven Liu <lq@onvideo.cn>pull/269/head
Steven Liu
7 years ago
parent
9d00fb9d70
commit
837580f458
4 changed files with 180 additions and 127 deletions
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#include "config.h" |
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#if HAVE_UNISTD_H |
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#include <unistd.h> |
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#endif |
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|
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#include "libavutil/avassert.h" |
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#include "libavutil/avstring.h" |
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#include "libavutil/intreadwrite.h" |
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#include "libavutil/mathematics.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/rational.h" |
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#include "libavutil/time_internal.h" |
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|
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#include "avc.h" |
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#include "avformat.h" |
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#include "avio_internal.h" |
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#include "internal.h" |
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#include "isom.h" |
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#include "os_support.h" |
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#include "url.h" |
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#include "dash.h" |
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|
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static DASHTmplId dash_read_tmpl_id(const char *identifier, char *format_tag, |
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size_t format_tag_size, const char **ptr) { |
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const char *next_ptr; |
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DASHTmplId id_type = DASH_TMPL_ID_UNDEFINED; |
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if (av_strstart(identifier, "$$", &next_ptr)) { |
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id_type = DASH_TMPL_ID_ESCAPE; |
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*ptr = next_ptr; |
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} else if (av_strstart(identifier, "$RepresentationID$", &next_ptr)) { |
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id_type = DASH_TMPL_ID_REP_ID; |
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// default to basic format, as $RepresentationID$ identifiers
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// are not allowed to have custom format-tags.
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av_strlcpy(format_tag, "%d", format_tag_size); |
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*ptr = next_ptr; |
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} else { // the following identifiers may have an explicit format_tag
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if (av_strstart(identifier, "$Number", &next_ptr)) |
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id_type = DASH_TMPL_ID_NUMBER; |
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else if (av_strstart(identifier, "$Bandwidth", &next_ptr)) |
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id_type = DASH_TMPL_ID_BANDWIDTH; |
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else if (av_strstart(identifier, "$Time", &next_ptr)) |
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id_type = DASH_TMPL_ID_TIME; |
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else |
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id_type = DASH_TMPL_ID_UNDEFINED; |
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// next parse the dash format-tag and generate a c-string format tag
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// (next_ptr now points at the first '%' at the beginning of the format-tag)
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if (id_type != DASH_TMPL_ID_UNDEFINED) { |
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const char *number_format = (id_type == DASH_TMPL_ID_TIME) ? PRId64 : "d"; |
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if (next_ptr[0] == '$') { // no dash format-tag
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snprintf(format_tag, format_tag_size, "%%%s", number_format); |
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*ptr = &next_ptr[1]; |
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} else { |
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const char *width_ptr; |
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// only tolerate single-digit width-field (i.e. up to 9-digit width)
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if (av_strstart(next_ptr, "%0", &width_ptr) && |
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av_isdigit(width_ptr[0]) && |
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av_strstart(&width_ptr[1], "d$", &next_ptr)) { |
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// yes, we're using a format tag to build format_tag.
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snprintf(format_tag, format_tag_size, "%s%c%s", "%0", width_ptr[0], number_format); |
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*ptr = next_ptr; |
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} else { |
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av_log(NULL, AV_LOG_WARNING, "Failed to parse format-tag beginning with %s. Expected either a " |
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"closing '$' character or a format-string like '%%0[width]d', " |
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"where width must be a single digit\n", next_ptr); |
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id_type = DASH_TMPL_ID_UNDEFINED; |
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} |
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} |
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} |
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} |
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return id_type; |
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} |
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|
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void ff_dash_fill_tmpl_params(char *dst, size_t buffer_size, |
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const char *template, int rep_id, |
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int number, int bit_rate, |
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int64_t time) { |
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int dst_pos = 0; |
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const char *t_cur = template; |
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while (dst_pos < buffer_size - 1 && *t_cur) { |
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char format_tag[7]; // May be "%d", "%0Xd", or "%0Xlld" (for $Time$), where X is in [0-9]
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int n = 0; |
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DASHTmplId id_type; |
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const char *t_next = strchr(t_cur, '$'); // copy over everything up to the first '$' character
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if (t_next) { |
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int num_copy_bytes = FFMIN(t_next - t_cur, buffer_size - dst_pos - 1); |
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av_strlcpy(&dst[dst_pos], t_cur, num_copy_bytes + 1); |
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// advance
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dst_pos += num_copy_bytes; |
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t_cur = t_next; |
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} else { // no more DASH identifiers to substitute - just copy the rest over and break
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av_strlcpy(&dst[dst_pos], t_cur, buffer_size - dst_pos); |
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break; |
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} |
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if (dst_pos >= buffer_size - 1 || !*t_cur) |
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break; |
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// t_cur is now pointing to a '$' character
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id_type = dash_read_tmpl_id(t_cur, format_tag, sizeof(format_tag), &t_next); |
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switch (id_type) { |
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case DASH_TMPL_ID_ESCAPE: |
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av_strlcpy(&dst[dst_pos], "$", 2); |
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n = 1; |
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break; |
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case DASH_TMPL_ID_REP_ID: |
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n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, rep_id); |
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break; |
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case DASH_TMPL_ID_NUMBER: |
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n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, number); |
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break; |
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case DASH_TMPL_ID_BANDWIDTH: |
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n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, bit_rate); |
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break; |
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case DASH_TMPL_ID_TIME: |
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n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, time); |
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break; |
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case DASH_TMPL_ID_UNDEFINED: |
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// copy over one byte and advance
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av_strlcpy(&dst[dst_pos], t_cur, 2); |
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n = 1; |
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t_next = &t_cur[1]; |
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break; |
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} |
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// t_next points just past the processed identifier
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// n is the number of bytes that were attempted to be written to dst
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// (may have failed to write all because buffer_size).
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// advance
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dst_pos += FFMIN(n, buffer_size - dst_pos - 1); |
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t_cur = t_next; |
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} |
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} |
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@ -0,0 +1,39 @@ |
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/*
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* MPEG-DASH ISO BMFF segmenter |
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* Copyright (c) 2014 Martin Storsjo |
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* |
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* This file is part of FFmpeg. |
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* |
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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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* |
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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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* |
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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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*/ |
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#ifndef AVFORMAT_DASH_H |
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#define AVFORMAT_DASH_H |
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#include "avformat.h" |
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// See ISO/IEC 23009-1:2014 5.3.9.4.4
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typedef enum { |
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DASH_TMPL_ID_UNDEFINED = -1, |
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DASH_TMPL_ID_ESCAPE, |
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DASH_TMPL_ID_REP_ID, |
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DASH_TMPL_ID_NUMBER, |
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DASH_TMPL_ID_BANDWIDTH, |
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DASH_TMPL_ID_TIME, |
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} DASHTmplId; |
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void ff_dash_fill_tmpl_params(char *dst, size_t buffer_size, const char *template, int rep_id, int number, int bit_rate, int64_t time); |
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#endif /* AVFORMAT_DASH_H */ |
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