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avformat/dashenc: allow splitting fragments following P-Frame reordering 

Signed-off-by: James Almer <jamrial@gmail.com>
tags/n4.3
James Almer 6 years ago
parent
ceb236c1c5
commit
ea5a910628
1 changed files with 67 additions and 2 deletions
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  1. +67
    -2
      libavformat/dashenc.c

+ 67
- 2
libavformat/dashenc.c View File

@@ -62,6 +62,7 @@ enum {
FRAG_TYPE_NONE = 0,
FRAG_TYPE_EVERY_FRAME,
FRAG_TYPE_DURATION,
FRAG_TYPE_PFRAMES,
FRAG_TYPE_NB
};

@@ -91,6 +92,8 @@ typedef struct OutputStream {
AVFormatContext *ctx;
int ctx_inited, as_idx;
AVIOContext *out;
AVCodecParserContext *parser;
AVCodecContext *parser_avctx;
int packets_written;
char initfile[1024];
int64_t init_start_pos, pos;
@@ -102,6 +105,7 @@ typedef struct OutputStream {
Segment **segments;
int64_t first_pts, start_pts, max_pts;
int64_t last_dts, last_pts;
int last_flags;
int bit_rate;
SegmentType segment_type; /* segment type selected for this particular stream */
const char *format_name;
@@ -117,6 +121,7 @@ typedef struct OutputStream {
char temp_path[1024];
double availability_time_offset;
int total_pkt_size;
int64_t total_pkt_duration;
int muxer_overhead;
int frag_type;
} OutputStream;
@@ -606,6 +611,8 @@ static void dash_free(AVFormatContext *s)
}
ff_format_io_close(s, &os->out);
avformat_free_context(os->ctx);
avcodec_free_context(&os->parser_avctx);
av_parser_close(os->parser);
for (j = 0; j < os->nb_segments; j++)
av_free(os->segments[j]);
av_free(os->segments);
@@ -933,6 +940,8 @@ static int parse_adaptation_sets(AVFormatContext *s)

if (!strcmp(type_str, "duration"))
as->frag_type = FRAG_TYPE_DURATION;
else if (!strcmp(type_str, "pframes"))
as->frag_type = FRAG_TYPE_PFRAMES;
else if (!strcmp(type_str, "every_frame"))
as->frag_type = FRAG_TYPE_EVERY_FRAME;
else if (!strcmp(type_str, "none"))
@@ -1349,6 +1358,18 @@ static int dash_init(AVFormatContext *s)
ctx->avoid_negative_ts = s->avoid_negative_ts;
ctx->flags = s->flags;

os->parser = av_parser_init(st->codecpar->codec_id);
if (os->parser) {
os->parser_avctx = avcodec_alloc_context3(NULL);
if (!os->parser_avctx)
return AVERROR(ENOMEM);
ret = avcodec_parameters_to_context(os->parser_avctx, st->codecpar);
if (ret < 0)
return ret;
// We only want to parse frame headers
os->parser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
}

if (c->single_file) {
if (os->single_file_name)
ff_dash_fill_tmpl_params(os->initfile, sizeof(os->initfile), os->single_file_name, i, 0, os->bit_rate, 0);
@@ -1391,6 +1412,11 @@ static int dash_init(AVFormatContext *s)
av_log(s, AV_LOG_ERROR, "Fragment duration %"PRId64" is longer than Segment duration %"PRId64"\n", os->frag_duration, os->seg_duration);
return AVERROR(EINVAL);
}
if (os->frag_type == FRAG_TYPE_PFRAMES && (st->codecpar->codec_type != AVMEDIA_TYPE_VIDEO || !os->parser)) {
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && !os->parser)
av_log(s, AV_LOG_WARNING, "frag_type set to P-Frame reordering, but no parser found for stream %d\n", i);
os->frag_type = c->streaming ? FRAG_TYPE_EVERY_FRAME : FRAG_TYPE_NONE;
}

if (os->segment_type == SEGMENT_TYPE_MP4) {
if (c->streaming)
@@ -1458,6 +1484,8 @@ static int dash_init(AVFormatContext *s)
av_log(s, AV_LOG_WARNING, "no video stream and no seg duration set\n");
return AVERROR(EINVAL);
}
if (!c->has_video && c->frag_type == FRAG_TYPE_PFRAMES)
av_log(s, AV_LOG_WARNING, "no video stream and P-frame fragmentation set\n");

c->nr_of_streams_flushed = 0;

@@ -1730,6 +1758,7 @@ static int dash_flush(AVFormatContext *s, int final, int stream)
av_rescale_q(os->max_pts - os->start_pts,
st->time_base, AV_TIME_BASE_Q);
os->total_pkt_size = 0;
os->total_pkt_duration = 0;

if (!os->bit_rate) {
// calculate average bitrate of first segment
@@ -1831,6 +1860,9 @@ static int dash_write_packet(AVFormatContext *s, AVPacket *pkt)
sizeof(c->availability_start_time));
}

if (!os->packets_written)
os->availability_time_offset = 0;

if (!os->availability_time_offset &&
((os->frag_type == FRAG_TYPE_DURATION && os->seg_duration != os->frag_duration) ||
(os->frag_type == FRAG_TYPE_EVERY_FRAME && pkt->duration))) {
@@ -1895,11 +1927,43 @@ static int dash_write_packet(AVFormatContext *s, AVPacket *pkt)
os->max_pts = pkt->pts + pkt->duration;
else
os->max_pts = FFMAX(os->max_pts, pkt->pts + pkt->duration);
os->packets_written++;
os->total_pkt_size += pkt->size;

if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
os->frag_type == FRAG_TYPE_PFRAMES &&
os->packets_written) {
uint8_t *data;
int size;

av_assert0(os->parser);
av_parser_parse2(os->parser, os->parser_avctx,
&data, &size, pkt->data, pkt->size,
pkt->pts, pkt->dts, pkt->pos);

if ((os->parser->pict_type == AV_PICTURE_TYPE_P &&
st->codecpar->video_delay &&
!(os->last_flags & AV_PKT_FLAG_KEY)) ||
pkt->flags & AV_PKT_FLAG_KEY) {
ret = av_write_frame(os->ctx, NULL);
if (ret < 0)
return ret;

if (!os->availability_time_offset) {
int64_t frag_duration = av_rescale_q(os->total_pkt_duration, st->time_base,
AV_TIME_BASE_Q);
os->availability_time_offset = ((double) os->seg_duration -
frag_duration) / AV_TIME_BASE;
}
}
}

if ((ret = ff_write_chained(os->ctx, 0, pkt, s, 0)) < 0)
return ret;

os->packets_written++;
os->total_pkt_size += pkt->size;
os->total_pkt_duration += pkt->duration;
os->last_flags = pkt->flags;

if (!os->init_range_length)
flush_init_segment(s, os);

@@ -2026,6 +2090,7 @@ static const AVOption options[] = {
{ "none", "one fragment per segment", 0, AV_OPT_TYPE_CONST, {.i64 = FRAG_TYPE_NONE }, 0, UINT_MAX, E, "frag_type"},
{ "every_frame", "fragment at every frame", 0, AV_OPT_TYPE_CONST, {.i64 = FRAG_TYPE_EVERY_FRAME }, 0, UINT_MAX, E, "frag_type"},
{ "duration", "fragment at specific time intervals", 0, AV_OPT_TYPE_CONST, {.i64 = FRAG_TYPE_DURATION }, 0, UINT_MAX, E, "frag_type"},
{ "pframes", "fragment at keyframes and following P-Frame reordering (Video only, experimental)", 0, AV_OPT_TYPE_CONST, {.i64 = FRAG_TYPE_PFRAMES }, 0, UINT_MAX, E, "frag_type"},
{ "remove_at_exit", "remove all segments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
{ "use_template", "Use SegmentTemplate instead of SegmentList", OFFSET(use_template), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E },
{ "use_timeline", "Use SegmentTimeline in SegmentTemplate", OFFSET(use_timeline), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, E },


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