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nut: Support experimental NUT 4 features

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Add the low overhead pipe mode and the extended broadcast mode.
Export the options as 'syncponts' since it impacts only that.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Luca Barbato
2014-03-06 17:58:34 +01:00
parent 6d212599aa
commit c94e2e85cb
5 changed files with 112 additions and 9 deletions
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29
libavformat/nutdec.c
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@@ -213,8 +213,8 @@ static int decode_main_header(NUTContext *nut)
end = get_packetheader(nut, bc, 1, MAIN_STARTCODE);
end += avio_tell(bc);
tmp = ffio_read_varlen(bc);
if (tmp < 2 && tmp > NUT_VERSION) {
nut->version = ffio_read_varlen(bc);
if (tmp < NUT_MIN_VERSION && tmp > NUT_MAX_VERSION) {
av_log(s, AV_LOG_ERROR, "Version %"PRId64" not supported.\n",
tmp);
return AVERROR(ENOSYS);
@@ -320,6 +320,11 @@ static int decode_main_header(NUTContext *nut)
assert(nut->header_len[0] == 0);
}
// flags had been effectively introduced in version 4
if (nut->version > NUT_STABLE_VERSION) {
nut->flags = ffio_read_varlen(bc);
}
if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
return AVERROR_INVALIDDATA;
@@ -547,6 +552,14 @@ static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count],
tmp / nut->time_base_count);
if (nut->flags & NUT_BROADCAST) {
tmp = ffio_read_varlen(bc);
av_log(s, AV_LOG_VERBOSE, "Syncpoint wallclock %"PRId64"\n",
av_rescale_q(tmp / nut->time_base_count,
nut->time_base[tmp % nut->time_base_count],
AV_TIME_BASE_Q));
}
if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
return AVERROR_INVALIDDATA;
@@ -728,7 +741,8 @@ static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
int size, flags, size_mul, pts_delta, i, reserved_count;
uint64_t tmp;
if (avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {
if (!(nut->flags & NUT_PIPE) &&
avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {
av_log(s, AV_LOG_ERROR,
"Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n",
avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
@@ -781,8 +795,9 @@ static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
if (flags & FLAG_CHECKSUM) {
avio_rb32(bc); // FIXME check this
} else if (size > 2 * nut->max_distance || FFABS(stc->last_pts - *pts) >
stc->max_pts_distance) {
} else if (!(nut->flags & NUT_PIPE) &&
size > 2 * nut->max_distance ||
FFABS(stc->last_pts - *pts) > stc->max_pts_distance) {
av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
return AVERROR_INVALIDDATA;
}
@@ -933,6 +948,10 @@ static int read_seek(AVFormatContext *s, int stream_index,
int64_t pos, pos2, ts;
int i;
if (nut->flags & NUT_PIPE) {
return AVERROR(ENOSYS);
}
if (st->index_entries) {
int index = av_index_search_timestamp(st, pts, flags);
if (index < 0)