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avformat/dashenc: implement DVB-DASH profile 

Add new required elements and constrain presence and values for existing
ones based on the spec.

Signed-off-by: James Almer <jamrial@gmail.com>
tags/n4.3
James Almer 6 years ago
parent
21847e2a52
commit
f63407a986
1 changed files with 73 additions and 4 deletions
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  1. +73
    -4
      libavformat/dashenc.c

+ 73
- 4
libavformat/dashenc.c View File

@@ -66,6 +66,9 @@ enum {
FRAG_TYPE_NB
};

#define MPD_PROFILE_DASH 1
#define MPD_PROFILE_DVB 2

typedef struct Segment {
char file[1024];
int64_t start_pos;
@@ -87,6 +90,9 @@ typedef struct AdaptationSet {
AVRational min_frame_rate, max_frame_rate;
int ambiguous_frame_rate;
int64_t max_frag_duration;
int max_width, max_height;
int nb_streams;
AVRational par;
} AdaptationSet;

typedef struct OutputStream {
@@ -128,6 +134,7 @@ typedef struct OutputStream {
int muxer_overhead;
int frag_type;
int64_t gop_size;
AVRational sar;
} OutputStream;

typedef struct DASHContext {
@@ -180,6 +187,7 @@ typedef struct DASHContext {
int frag_type;
int write_prft;
int64_t max_gop_size;
int profile;
} DASHContext;

static struct codec_string {
@@ -796,6 +804,12 @@ static int write_adaptation_set(AVFormatContext *s, AVIOContext *out, int as_ind
as->id, as->media_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
if (as->media_type == AVMEDIA_TYPE_VIDEO && as->max_frame_rate.num && !as->ambiguous_frame_rate && av_cmp_q(as->min_frame_rate, as->max_frame_rate) < 0)
avio_printf(out, " maxFrameRate=\"%d/%d\"", as->max_frame_rate.num, as->max_frame_rate.den);
else if (as->media_type == AVMEDIA_TYPE_VIDEO && as->max_frame_rate.num && !as->ambiguous_frame_rate && !av_cmp_q(as->min_frame_rate, as->max_frame_rate))
avio_printf(out, " frameRate=\"%d/%d\"", as->max_frame_rate.num, as->max_frame_rate.den);
if (as->media_type == AVMEDIA_TYPE_VIDEO) {
avio_printf(out, " maxWidth=\"%d\" maxHeight=\"%d\"", as->max_width, as->max_height);
avio_printf(out, " par=\"%d:%d\"", as->par.num, as->par.den);
}
lang = av_dict_get(as->metadata, "language", NULL, 0);
if (lang)
avio_printf(out, " lang=\"%s\"", lang->value);
@@ -823,7 +837,12 @@ static int write_adaptation_set(AVFormatContext *s, AVIOContext *out, int as_ind
if (as->media_type == AVMEDIA_TYPE_VIDEO) {
avio_printf(out, "\t\t\t<Representation id=\"%d\" mimeType=\"video/%s\" codecs=\"%s\"%s width=\"%d\" height=\"%d\"",
i, os->format_name, os->codec_str, bandwidth_str, s->streams[i]->codecpar->width, s->streams[i]->codecpar->height);
if (st->avg_frame_rate.num)
if (st->codecpar->field_order == AV_FIELD_UNKNOWN)
avio_printf(out, " scanType=\"unknown\"");
else if (st->codecpar->field_order != AV_FIELD_PROGRESSIVE)
avio_printf(out, " scanType=\"interlaced\"");
avio_printf(out, " sar=\"%d:%d\"", os->sar.num, os->sar.den);
if (st->avg_frame_rate.num && av_cmp_q(as->min_frame_rate, as->max_frame_rate) < 0)
avio_printf(out, " frameRate=\"%d/%d\"", st->avg_frame_rate.num, st->avg_frame_rate.den);
avio_printf(out, ">\n");
} else {
@@ -852,8 +871,13 @@ static int write_adaptation_set(AVFormatContext *s, AVIOContext *out, int as_ind
static int add_adaptation_set(AVFormatContext *s, AdaptationSet **as, enum AVMediaType type)
{
DASHContext *c = s->priv_data;
void *mem;

void *mem = av_realloc(c->as, sizeof(*c->as) * (c->nb_as + 1));
if (c->profile & MPD_PROFILE_DVB && (c->nb_as + 1) > 16) {
av_log(s, AV_LOG_ERROR, "DVB-DASH profile allows a max of 16 Adaptation Sets\n");
return AVERROR(EINVAL);
}
mem = av_realloc(c->as, sizeof(*c->as) * (c->nb_as + 1));
if (!mem)
return AVERROR(ENOMEM);
c->as = mem;
@@ -880,7 +904,12 @@ static int adaptation_set_add_stream(AVFormatContext *s, int as_idx, int i)
av_log(s, AV_LOG_ERROR, "Stream %d is already assigned to an AdaptationSet\n", i);
return AVERROR(EINVAL);
}
if (c->profile & MPD_PROFILE_DVB && (as->nb_streams + 1) > 16) {
av_log(s, AV_LOG_ERROR, "DVB-DASH profile allows a max of 16 Representations per Adaptation Set\n");
return AVERROR(EINVAL);
}
os->as_idx = as_idx;
++as->nb_streams;

return 0;
}
@@ -901,6 +930,7 @@ static int parse_adaptation_sets(AVFormatContext *s)
snprintf(as->id, sizeof(as->id), "%d", i);

c->streams[i].as_idx = c->nb_as;
++as->nb_streams;
}
goto end;
}
@@ -1077,8 +1107,13 @@ static int write_manifest(AVFormatContext *s, int final)
"\txmlns=\"urn:mpeg:dash:schema:mpd:2011\"\n"
"\txmlns:xlink=\"http://www.w3.org/1999/xlink\"\n"
"\txsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011 http://standards.iso.org/ittf/PubliclyAvailableStandards/MPEG-DASH_schema_files/DASH-MPD.xsd\"\n"
"\tprofiles=\"urn:mpeg:dash:profile:isoff-live:2011\"\n"
"\ttype=\"%s\"\n", final ? "static" : "dynamic");
"\tprofiles=\"");
if (c->profile & MPD_PROFILE_DASH)
avio_printf(out, "%s%s", "urn:mpeg:dash:profile:isoff-live:2011", c->profile & MPD_PROFILE_DVB ? "," : "\"\n");
if (c->profile & MPD_PROFILE_DVB)
avio_printf(out, "%s", "urn:dvb:dash:profile:dvb-dash:2014\"\n");
avio_printf(out, "\ttype=\"%s\"\n",
final ? "static" : "dynamic");
if (final) {
avio_printf(out, "\tmediaPresentationDuration=\"");
write_time(out, c->total_duration);
@@ -1249,6 +1284,10 @@ static int dash_init(AVFormatContext *s)
if (c->single_file)
c->use_template = 0;

if (!c->profile) {
av_log(s, AV_LOG_ERROR, "At least one profile must be enabled.\n");
return AVERROR(EINVAL);
}
#if FF_API_DASH_MIN_SEG_DURATION
if (c->min_seg_duration != 5000000) {
av_log(s, AV_LOG_WARNING, "The min_seg_duration option is deprecated and will be removed. Please use the -seg_duration\n");
@@ -1445,6 +1484,11 @@ static int dash_init(AVFormatContext *s)
os->frag_duration = as->frag_duration;
os->frag_type = as->frag_type;

if (c->profile & MPD_PROFILE_DVB && (os->seg_duration > 15000000 || os->seg_duration < 960000)) {
av_log(s, AV_LOG_ERROR, "Segment duration %"PRId64" is outside the allowed range for DVB-DASH profile\n", os->seg_duration);
return AVERROR(EINVAL);
}

if (os->frag_type == FRAG_TYPE_DURATION && !os->frag_duration) {
av_log(s, AV_LOG_WARNING, "frag_type set to duration for stream %d but no frag_duration set\n", i);
os->frag_type = c->streaming ? FRAG_TYPE_EVERY_FRAME : FRAG_TYPE_NONE;
@@ -1501,6 +1545,7 @@ static int dash_init(AVFormatContext *s)
s->avoid_negative_ts = ctx->avoid_negative_ts;
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
AVRational avg_frame_rate = s->streams[i]->avg_frame_rate;
AVRational par;
if (avg_frame_rate.num > 0) {
if (av_cmp_q(avg_frame_rate, as->min_frame_rate) < 0)
as->min_frame_rate = avg_frame_rate;
@@ -1509,6 +1554,27 @@ static int dash_init(AVFormatContext *s)
} else {
as->ambiguous_frame_rate = 1;
}

if (st->codecpar->width > as->max_width)
as->max_width = st->codecpar->width;
if (st->codecpar->height > as->max_height)
as->max_height = st->codecpar->height;

if (st->sample_aspect_ratio.num)
os->sar = st->sample_aspect_ratio;
else
os->sar = (AVRational){1,1};
av_reduce(&par.num, &par.den,
st->codecpar->width * (int64_t)os->sar.num,
st->codecpar->height * (int64_t)os->sar.den,
1024 * 1024);

if (as->par.num && av_cmp_q(par, as->par)) {
av_log(s, AV_LOG_ERROR, "Conflicting stream par values in Adaptation Set %d\n", os->as_idx);
return AVERROR(EINVAL);
}
as->par = par;

c->has_video = 1;
}

@@ -2179,6 +2245,9 @@ static const AVOption options[] = {
{ "ldash", "Enable Low-latency dash. Constrains the value of a few elements", OFFSET(ldash), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
{ "master_m3u8_publish_rate", "Publish master playlist every after this many segment intervals", OFFSET(master_publish_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, UINT_MAX, E},
{ "write_prft", "Write producer reference time element", OFFSET(write_prft), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E},
{ "mpd_profile", "Set profiles. Elements and values used in the manifest may be constrained by them", OFFSET(profile), AV_OPT_TYPE_FLAGS, {.i64 = MPD_PROFILE_DASH }, 0, UINT_MAX, E, "mpd_profile"},
{ "dash", "MPEG-DASH ISO Base media file format live profile", 0, AV_OPT_TYPE_CONST, {.i64 = MPD_PROFILE_DASH }, 0, UINT_MAX, E, "mpd_profile"},
{ "dvb_dash", "DVB-DASH profile", 0, AV_OPT_TYPE_CONST, {.i64 = MPD_PROFILE_DVB }, 0, UINT_MAX, E, "mpd_profile"},
{ NULL },
};



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