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dashenc: Add options to make segment names configurable

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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 2014-11-27 09:46:02 +00:00 committed by Martin Storsjö
parent 01eac895ab
commit a9d8d35e48
1 changed files with 146 additions and 8 deletions
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152
libavformat/dashenc.c
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@ -38,6 +38,16 @@
#include "os_support.h"
#include "url.h"
// See ISO/IEC 23009-1:2014 5.3.9.4.4
typedef enum {
DASH_TMPL_ID_UNDEFINED = -1,
DASH_TMPL_ID_ESCAPE,
DASH_TMPL_ID_REP_ID,
DASH_TMPL_ID_NUMBER,
DASH_TMPL_ID_BANDWIDTH,
DASH_TMPL_ID_TIME,
} DASHTmplId;
typedef struct Segment {
char file[1024];
int64_t start_pos;
@ -59,6 +69,7 @@ typedef struct OutputStream {
int nb_segments, segments_size, segment_index;
Segment **segments;
int64_t first_dts, start_dts, end_dts;
int bit_rate;
char bandwidth_str[64];
char codec_str[100];
@ -79,6 +90,9 @@ typedef struct DASHContext {
int total_duration;
char availability_start_time[100];
char dirname[1024];
const char *single_file_name;
const char *init_seg_name;
const char *media_seg_name;
} DASHContext;
static int dash_write(void *opaque, uint8_t *buf, int buf_size)
@ -192,7 +206,7 @@ static void output_segment_list(OutputStream *os, AVIOContext *out, DASHContext
avio_printf(out, "\t\t\t\t<SegmentTemplate timescale=\"%d\" ", timescale);
if (!c->use_timeline)
avio_printf(out, "duration=\"%d\" ", c->last_duration);
avio_printf(out, "initialization=\"init-stream$RepresentationID$.m4s\" media=\"chunk-stream$RepresentationID$-$Number%%05d$.m4s\" startNumber=\"%d\">\n", c->use_timeline ? start_number : 1);
avio_printf(out, "initialization=\"%s\" media=\"%s\" startNumber=\"%d\">\n", c->init_seg_name, c->media_seg_name, c->use_timeline ? start_number : 1);
if (c->use_timeline) {
avio_printf(out, "\t\t\t\t\t<SegmentTimeline>\n");
for (i = start_index; i < os->nb_segments; ) {
@ -235,6 +249,120 @@ static void output_segment_list(OutputStream *os, AVIOContext *out, DASHContext
}
}
static DASHTmplId dash_read_tmpl_id(const char *identifier, char *format_tag,
size_t format_tag_size, const char **ptr) {
const char *next_ptr;
DASHTmplId id_type = DASH_TMPL_ID_UNDEFINED;
if (av_strstart(identifier, "$$", &next_ptr)) {
id_type = DASH_TMPL_ID_ESCAPE;
*ptr = next_ptr;
} else if (av_strstart(identifier, "$RepresentationID$", &next_ptr)) {
id_type = DASH_TMPL_ID_REP_ID;
// default to basic format, as $RepresentationID$ identifiers
// are not allowed to have custom format-tags.
av_strlcpy(format_tag, "%d", format_tag_size);
*ptr = next_ptr;
} else { // the following identifiers may have an explicit format_tag
if (av_strstart(identifier, "$Number", &next_ptr))
id_type = DASH_TMPL_ID_NUMBER;
else if (av_strstart(identifier, "$Bandwidth", &next_ptr))
id_type = DASH_TMPL_ID_BANDWIDTH;
else if (av_strstart(identifier, "$Time", &next_ptr))
id_type = DASH_TMPL_ID_TIME;
else
id_type = DASH_TMPL_ID_UNDEFINED;
// next parse the dash format-tag and generate a c-string format tag
// (next_ptr now points at the first '%' at the beginning of the format-tag)
if (id_type != DASH_TMPL_ID_UNDEFINED) {
const char *number_format = DASH_TMPL_ID_TIME ? "lld" : "d";
if (next_ptr[0] == '$') { // no dash format-tag
snprintf(format_tag, format_tag_size, "%%%s", number_format);
*ptr = &next_ptr[1];
} else {
const char *width_ptr;
// only tolerate single-digit width-field (i.e. up to 9-digit width)
if (av_strstart(next_ptr, "%0", &width_ptr) &&
av_isdigit(width_ptr[0]) &&
av_strstart(&width_ptr[1], "d$", &next_ptr)) {
// yes, we're using a format tag to build format_tag.
snprintf(format_tag, format_tag_size, "%s%c%s", "%0", width_ptr[0], number_format);
*ptr = next_ptr;
} else {
av_log(NULL, AV_LOG_WARNING, "Failed to parse format-tag beginning with %s. Expected either a "
"closing '$' character or a format-string like '%%0[width]d', "
"where width must be a single digit\n", next_ptr);
id_type = DASH_TMPL_ID_UNDEFINED;
}
}
}
}
return id_type;
}
static void dash_fill_tmpl_params(char *dst, size_t buffer_size,
const char *template, int rep_id,
int number, int bit_rate,
int64_t time) {
int dst_pos = 0;
const char *t_cur = template;
while (dst_pos < buffer_size - 1 && *t_cur) {
int format_tag_size = 7;
char format_tag[format_tag_size]; // May be "%d", "%0Xd", or "%0Xlld" (for $Time$), where X is in [0-9]
int n = 0;
DASHTmplId id_type;
const char *t_next = strchr(t_cur, '$'); // copy over everything up to the first '$' character
if (t_next) {
int num_copy_bytes = FFMIN(t_next - t_cur, buffer_size - dst_pos - 1);
av_strlcpy(&dst[dst_pos], t_cur, num_copy_bytes + 1);
// advance
dst_pos += num_copy_bytes;
t_cur = t_next;
} else { // no more DASH identifiers to substitute - just copy the rest over and break
av_strlcpy(&dst[dst_pos], t_cur, buffer_size - dst_pos);
break;
}
if (dst_pos >= buffer_size - 1 || !*t_cur)
break;
// t_cur is now pointing to a '$' character
id_type = dash_read_tmpl_id(t_cur, format_tag, format_tag_size, &t_next);
switch (id_type) {
case DASH_TMPL_ID_ESCAPE:
av_strlcpy(&dst[dst_pos], "$", 2);
n = 1;
break;
case DASH_TMPL_ID_REP_ID:
n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, rep_id);
break;
case DASH_TMPL_ID_NUMBER:
n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, number);
break;
case DASH_TMPL_ID_BANDWIDTH:
n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, bit_rate);
break;
case DASH_TMPL_ID_TIME:
n = snprintf(&dst[dst_pos], buffer_size - dst_pos, format_tag, time);
break;
case DASH_TMPL_ID_UNDEFINED:
// copy over one byte and advance
av_strlcpy(&dst[dst_pos], t_cur, 2);
n = 1;
t_next = &t_cur[1];
break;
}
// t_next points just past the processed identifier
// n is the number of bytes that were attempted to be written to dst
// (may have failed to write all because buffer_size).
// advance
dst_pos += FFMIN(n, buffer_size - dst_pos - 1);
t_cur = t_next;
}
}
static char *xmlescape(const char *str) {
int outlen = strlen(str)*3/2 + 6;
char *out = av_realloc(NULL, outlen + 1);
@ -403,6 +531,8 @@ static int dash_write_header(AVFormatContext *s)
char *ptr;
char basename[1024];
if (c->single_file_name)
c->single_file = 1;
if (c->single_file)
c->use_template = 0;
@ -439,9 +569,10 @@ static int dash_write_header(AVFormatContext *s)
AVDictionary *opts = NULL;
char filename[1024];
if (s->streams[i]->codec->bit_rate) {
os->bit_rate = s->streams[i]->codec->bit_rate;
if (os->bit_rate) {
snprintf(os->bandwidth_str, sizeof(os->bandwidth_str),
" bandwidth=\"%d\"", s->streams[i]->codec->bit_rate);
" bandwidth=\"%d\"", os->bit_rate);
} else {
int level = s->strict_std_compliance >= FF_COMPLIANCE_STRICT ?
AV_LOG_ERROR : AV_LOG_WARNING;
@ -476,10 +607,14 @@ static int dash_write_header(AVFormatContext *s)
goto fail;
}
if (c->single_file)
snprintf(os->initfile, sizeof(os->initfile), "%s-stream%d.m4s", basename, i);
if (c->single_file) {
if (c->single_file_name)
dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), c->single_file_name, i, 0, os->bit_rate, 0);
else
snprintf(os->initfile, sizeof(os->initfile), "init-stream%d.m4s", i);
snprintf(os->initfile, sizeof(os->initfile), "%s-stream%d.m4s", basename, i);
} else {
dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), c->init_seg_name, i, 0, os->bit_rate, 0);
}
snprintf(filename, sizeof(filename), "%s%s", c->dirname, os->initfile);
ret = ffurl_open(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
if (ret < 0)
@ -624,7 +759,7 @@ static int dash_flush(AVFormatContext *s, int final, int stream)
}
if (!c->single_file) {
snprintf(filename, sizeof(filename), "chunk-stream%d-%05d.m4s", i, os->segment_index);
dash_fill_tmpl_params(filename, sizeof(filename), c->media_seg_name, i, os->segment_index, os->bit_rate, os->start_dts);
snprintf(full_path, sizeof(full_path), "%s%s", c->dirname, filename);
snprintf(temp_path, sizeof(temp_path), "%s.tmp", full_path);
ret = ffurl_open(&os->out, temp_path, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL);
@ -769,6 +904,9 @@ static const AVOption options[] = {
{ "use_template", "Use SegmentTemplate instead of SegmentList", OFFSET(use_template), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E },
{ "use_timeline", "Use SegmentTimeline in SegmentTemplate", OFFSET(use_timeline), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E },
{ "single_file", "Store all segments in one file, accessed using byte ranges", OFFSET(single_file), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E },
{ "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 },
{ "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 },
{ "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 },
{ NULL },
};