mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2025-03-23 04:24:35 +02:00
dashenc: Add options to make segment names configurable
This allows one to specify templated segment names for init-segments, media-segments, and for the base-url in the case of single-file. Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Bryan Huh
Martin Storsjö
parent
01eac895ab
commit
a9d8d35e48
@ -38,6 +38,16 @@
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#include "os_support.h"
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#include "url.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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typedef struct Segment {
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char file[1024];
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int64_t start_pos;
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@ -59,6 +69,7 @@ typedef struct OutputStream {
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int nb_segments, segments_size, segment_index;
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Segment **segments;
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int64_t first_dts, start_dts, end_dts;
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int bit_rate;
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char bandwidth_str[64];
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char codec_str[100];
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@ -79,6 +90,9 @@ typedef struct DASHContext {
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int total_duration;
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char availability_start_time[100];
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char dirname[1024];
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const char *single_file_name;
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const char *init_seg_name;
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const char *media_seg_name;
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} DASHContext;
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static int dash_write(void *opaque, uint8_t *buf, int buf_size)
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@ -192,7 +206,7 @@ static void output_segment_list(OutputStream *os, AVIOContext *out, DASHContext
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avio_printf(out, "\t\t\t\t<SegmentTemplate timescale=\"%d\" ", timescale);
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if (!c->use_timeline)
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avio_printf(out, "duration=\"%d\" ", c->last_duration);
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avio_printf(out, "initialization=\"init-stream$RepresentationID$.m4s\" media=\"chunk-stream$RepresentationID$-$Number%%05d$.m4s\" startNumber=\"%d\">\n", c->use_timeline ? start_number : 1);
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avio_printf(out, "initialization=\"%s\" media=\"%s\" startNumber=\"%d\">\n", c->init_seg_name, c->media_seg_name, c->use_timeline ? start_number : 1);
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if (c->use_timeline) {
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avio_printf(out, "\t\t\t\t\t<SegmentTimeline>\n");
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for (i = start_index; i < os->nb_segments; ) {
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@ -235,6 +249,120 @@ static void output_segment_list(OutputStream *os, AVIOContext *out, DASHContext
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}
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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, "$Time", &next_ptr))
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id_type = DASH_TMPL_ID_TIME;
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else
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id_type = DASH_TMPL_ID_UNDEFINED;
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// next parse the dash format-tag and generate a c-string format tag
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// (next_ptr now points at the first '%' at the beginning of the format-tag)
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if (id_type != DASH_TMPL_ID_UNDEFINED) {
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const char *number_format = DASH_TMPL_ID_TIME ? "lld" : "d";
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if (next_ptr[0] == '$') { // 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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static void 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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int format_tag_size = 7;
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char format_tag[format_tag_size]; // 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 '$' character
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id_type = dash_read_tmpl_id(t_cur, format_tag, format_tag_size, &t_next);
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switch (id_type) {
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case DASH_TMPL_ID_ESCAPE:
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av_strlcpy(&dst[dst_pos], "$", 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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static char *xmlescape(const char *str) {
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int outlen = strlen(str)*3/2 + 6;
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char *out = av_realloc(NULL, outlen + 1);
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@ -403,6 +531,8 @@ static int dash_write_header(AVFormatContext *s)
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char *ptr;
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char basename[1024];
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if (c->single_file_name)
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c->single_file = 1;
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if (c->single_file)
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c->use_template = 0;
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@ -439,9 +569,10 @@ static int dash_write_header(AVFormatContext *s)
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AVDictionary *opts = NULL;
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char filename[1024];
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if (s->streams[i]->codec->bit_rate) {
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os->bit_rate = s->streams[i]->codec->bit_rate;
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if (os->bit_rate) {
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snprintf(os->bandwidth_str, sizeof(os->bandwidth_str),
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" bandwidth=\"%d\"", s->streams[i]->codec->bit_rate);
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" bandwidth=\"%d\"", os->bit_rate);
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} else {
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int level = s->strict_std_compliance >= FF_COMPLIANCE_STRICT ?
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AV_LOG_ERROR : AV_LOG_WARNING;
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@ -476,10 +607,14 @@ static int dash_write_header(AVFormatContext *s)
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goto fail;
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}
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if (c->single_file)
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snprintf(os->initfile, sizeof(os->initfile), "%s-stream%d.m4s", basename, i);
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else
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snprintf(os->initfile, sizeof(os->initfile), "init-stream%d.m4s", i);
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if (c->single_file) {
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if (c->single_file_name)
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dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), c->single_file_name, i, 0, os->bit_rate, 0);
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else
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snprintf(os->initfile, sizeof(os->initfile), "%s-stream%d.m4s", basename, i);
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} else {
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dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), c->init_seg_name, i, 0, os->bit_rate, 0);
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}
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snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);
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ret = ffurl_open(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
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if (ret < 0)
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@ -624,7 +759,7 @@ static int dash_flush(AVFormatContext *s, int final, int stream)
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}
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if (!c->single_file) {
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snprintf(filename, sizeof(filename), "chunk-stream%d-%05d.m4s", i, os->segment_index);
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dash_fill_tmpl_params(filename, sizeof(filename), c->media_seg_name, i, os->segment_index, os->bit_rate, os->start_dts);
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snprintf(full_path, sizeof(full_path), "%s%s", c->dirname, filename);
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snprintf(temp_path, sizeof(temp_path), "%s.tmp", full_path);
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ret = ffurl_open(&os->out, temp_path, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
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@ -769,6 +904,9 @@ static const AVOption options[] = {
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{ "use_template", "Use SegmentTemplate instead of SegmentList", OFFSET(use_template), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E },
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{ "use_timeline", "Use SegmentTimeline in SegmentTemplate", OFFSET(use_timeline), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E },
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{ "single_file", "Store all segments in one file, accessed using byte ranges", OFFSET(single_file), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
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{ "single_file_name", "DASH-templated name to be used for baseURL. Implies storing all segments in one file, accessed using byte ranges", OFFSET(single_file_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },
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{ "init_seg_name", "DASH-templated name to used for the initialization segment", OFFSET(init_seg_name), AV_OPT_TYPE_STRING, {.str = "init-stream$RepresentationID$.m4s"}, 0, 0, E },
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{ "media_seg_name", "DASH-templated name to used for the media segments", OFFSET(media_seg_name), AV_OPT_TYPE_STRING, {.str = "chunk-stream$RepresentationID$-$Number%05d$.m4s"}, 0, 0, E },
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{ NULL },
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};
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