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lavf/mov: add support for sidx fragment indexes 

Fixes trac #3842
This commit is contained in:
Rodger Combs 2015-07-20 15:00:35 -05:00
parent cd847839f3
commit 4ab5666759
2 changed files with 208 additions and 39 deletions
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2
libavformat/isom.h
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@ -103,6 +103,7 @@ typedef struct MOVSbgp {
typedef struct MOVFragmentIndexItem {
int64_t moof_offset;
int64_t time;
int headers_read;
} MOVFragmentIndexItem;
typedef struct MOVFragmentIndex {
@ -197,6 +198,7 @@ typedef struct MOVContext {
int has_looked_for_mfra;
MOVFragmentIndex** fragment_index_data;
unsigned fragment_index_count;
int fragment_index_complete;
int atom_depth;
unsigned int aax_mode; ///< 'aax' file has been detected
uint8_t file_key[20];

245
libavformat/mov.c
View File

@ -3349,7 +3349,7 @@ static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
MOVFragment *frag = &c->fragment;
MOVTrackExt *trex = NULL;
MOVFragmentIndex* index = NULL;
int flags, track_id, i;
int flags, track_id, i, found = 0;
avio_r8(pb); /* version */
flags = avio_rb24(pb);
@ -3367,15 +3367,6 @@ static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
av_log(c->fc, AV_LOG_ERROR, "could not find corresponding trex\n");
return AVERROR_INVALIDDATA;
}
for (i = 0; i < c->fragment_index_count; i++) {
MOVFragmentIndex* candidate = c->fragment_index_data[i];
if (candidate->track_id == frag->track_id) {
av_log(c->fc, AV_LOG_DEBUG,
"found fragment index for track %u\n", frag->track_id);
index = candidate;
break;
}
}
frag->base_data_offset = flags & MOV_TFHD_BASE_DATA_OFFSET ?
avio_rb64(pb) : flags & MOV_TFHD_DEFAULT_BASE_IS_MOOF ?
@ -3389,23 +3380,32 @@ static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
frag->flags = flags & MOV_TFHD_DEFAULT_FLAGS ?
avio_rb32(pb) : trex->flags;
frag->time = AV_NOPTS_VALUE;
if (index) {
int i, found = 0;
for (i = index->current_item; i < index->item_count; i++) {
if (frag->implicit_offset == index->items[i].moof_offset) {
av_log(c->fc, AV_LOG_DEBUG, "found fragment index entry "
"for track %u and moof_offset %"PRId64"\n",
frag->track_id, index->items[i].moof_offset);
frag->time = index->items[i].time;
index->current_item = i + 1;
found = 1;
for (i = 0; i < c->fragment_index_count; i++) {
int j;
MOVFragmentIndex* candidate = c->fragment_index_data[i];
if (candidate->track_id == frag->track_id) {
av_log(c->fc, AV_LOG_DEBUG,
"found fragment index for track %u\n", frag->track_id);
index = candidate;
for (j = index->current_item; j < index->item_count; j++) {
if (frag->implicit_offset == index->items[j].moof_offset) {
av_log(c->fc, AV_LOG_DEBUG, "found fragment index entry "
"for track %u and moof_offset %"PRId64"\n",
frag->track_id, index->items[j].moof_offset);
frag->time = index->items[j].time;
index->current_item = j + 1;
found = 1;
break;
}
}
if (found)
break;
}
if (!found) {
av_log(c->fc, AV_LOG_WARNING, "track %u has a fragment index "
"but it doesn't have an (in-order) entry for moof_offset "
"%"PRId64"\n", frag->track_id, frag->implicit_offset);
}
}
if (index && !found) {
av_log(c->fc, AV_LOG_DEBUG, "track %u has a fragment index but "
"it doesn't have an (in-order) entry for moof_offset "
"%"PRId64"\n", frag->track_id, frag->implicit_offset);
}
av_log(c->fc, AV_LOG_TRACE, "frag flags 0x%x\n", frag->flags);
return 0;
@ -3596,7 +3596,106 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
return AVERROR_EOF;
frag->implicit_offset = offset;
st->duration = sc->track_end = dts + sc->time_offset;
sc->track_end = dts + sc->time_offset;
if (st->duration < sc->track_end)
st->duration = sc->track_end;
return 0;
}
static int mov_read_sidx(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
int64_t offset = avio_tell(pb) + atom.size, pts;
uint8_t version;
unsigned i, track_id;
AVStream *st = NULL;
MOVStreamContext *sc;
MOVFragmentIndex *index = NULL;
MOVFragmentIndex **tmp;
AVRational timescale;
version = avio_r8(pb);
if (version > 1) {
avpriv_request_sample(c->fc, "sidx version %u", version);
return AVERROR_PATCHWELCOME;
}
avio_rb24(pb); // flags
track_id = avio_rb32(pb); // Reference ID
for (i = 0; i < c->fc->nb_streams; i++) {
if (c->fc->streams[i]->id == track_id) {
st = c->fc->streams[i];
break;
}
}
if (!st) {
av_log(c->fc, AV_LOG_ERROR, "could not find corresponding track id %d\n", track_id);
return AVERROR_INVALIDDATA;
}
sc = st->priv_data;
timescale = av_make_q(1, avio_rb32(pb));
if (version == 0) {
pts = avio_rb32(pb);
offset += avio_rb32(pb);
} else {
pts = avio_rb64(pb);
offset += avio_rb64(pb);
}
avio_rb16(pb); // reserved
index = av_mallocz(sizeof(MOVFragmentIndex));
if (!index)
return AVERROR(ENOMEM);
index->track_id = track_id;
index->item_count = avio_rb16(pb);
index->items = av_mallocz_array(index->item_count, sizeof(MOVFragmentIndexItem));
if (!index->items) {
av_freep(&index);
return AVERROR(ENOMEM);
}
for (i = 0; i < index->item_count; i++) {
uint32_t size = avio_rb32(pb);
uint32_t duration = avio_rb32(pb);
if (size & 0x80000000) {
avpriv_request_sample(c->fc, "sidx reference_type 1");
av_freep(&index->items);
av_freep(&index);
return AVERROR_PATCHWELCOME;
}
avio_rb32(pb); // sap_flags
index->items[i].moof_offset = offset;
index->items[i].time = av_rescale_q(pts, st->time_base, timescale);
offset += size;
pts += duration;
}
st->duration = sc->track_end = pts;
tmp = av_realloc_array(c->fragment_index_data,
c->fragment_index_count + 1,
sizeof(MOVFragmentIndex*));
if (!tmp) {
av_freep(&index->items);
av_freep(&index);
return AVERROR(ENOMEM);
}
c->fragment_index_data = tmp;
c->fragment_index_data[c->fragment_index_count++] = index;
if (offset == avio_size(pb))
c->fragment_index_complete = 1;
return 0;
}
@ -3854,6 +3953,7 @@ static const MOVParseTableEntry mov_default_parse_table[] = {
{ MKTAG('a','l','a','c'), mov_read_alac }, /* alac specific atom */
{ MKTAG('a','v','c','C'), mov_read_glbl },
{ MKTAG('p','a','s','p'), mov_read_pasp },
{ MKTAG('s','i','d','x'), mov_read_sidx },
{ MKTAG('s','t','b','l'), mov_read_default },
{ MKTAG('s','t','c','o'), mov_read_stco },
{ MKTAG('s','t','p','s'), mov_read_stps },
@ -3978,9 +4078,9 @@ static int mov_read_default(MOVContext *c, AVIOContext *pb, MOVAtom atom)
return err;
}
if (c->found_moov && c->found_mdat &&
((!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX) ||
((!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX || c->fragment_index_complete) ||
start_pos + a.size == avio_size(pb))) {
if (!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX)
if (!pb->seekable || c->fc->flags & AVFMT_FLAG_IGNIDX || c->fragment_index_complete)
c->next_root_atom = start_pos + a.size;
c->atom_depth --;
return 0;
@ -4585,6 +4685,52 @@ static int should_retry(AVIOContext *pb, int error_code) {
return 1;
}
static int mov_switch_root(AVFormatContext *s, int64_t target)
{
MOVContext *mov = s->priv_data;
int i, j;
int already_read = 0;
if (avio_seek(s->pb, target, SEEK_SET) != target) {
av_log(mov->fc, AV_LOG_ERROR, "root atom offset 0x%"PRIx64": partial file\n", target);
return AVERROR_INVALIDDATA;
}
mov->next_root_atom = 0;
for (i = 0; i < mov->fragment_index_count; i++) {
MOVFragmentIndex *index = mov->fragment_index_data[i];
int found = 0;
for (j = 0; j < index->item_count; j++) {
MOVFragmentIndexItem *item = &index->items[j];
if (found) {
mov->next_root_atom = item->moof_offset;
break; // Advance to next index in outer loop
} else if (item->moof_offset == target) {
index->current_item = FFMIN(j, index->current_item);
if (item->headers_read)
already_read = 1;
item->headers_read = 1;
found = 1;
}
}
if (!found)
index->current_item = 0;
}
if (already_read)
return 0;
mov->found_mdat = 0;
if (mov_read_default(mov, s->pb, (MOVAtom){ AV_RL32("root"), INT64_MAX }) < 0 ||
avio_feof(s->pb))
return AVERROR_EOF;
av_log(s, AV_LOG_TRACE, "read fragments, offset 0x%"PRIx64"\n", avio_tell(s->pb));
return 1;
}
static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
{
MOVContext *mov = s->priv_data;
@ -4595,19 +4741,11 @@ static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
mov->fc = s;
retry:
sample = mov_find_next_sample(s, &st);
if (!sample) {
mov->found_mdat = 0;
if (!sample || (mov->next_root_atom && sample->pos > mov->next_root_atom)) {
if (!mov->next_root_atom)
return AVERROR_EOF;
if (avio_seek(s->pb, mov->next_root_atom, SEEK_SET) != mov->next_root_atom) {
av_log(mov->fc, AV_LOG_ERROR, "next root atom offset 0x%"PRIx64": partial file\n", mov->next_root_atom);
return AVERROR_INVALIDDATA;
}
mov->next_root_atom = 0;
if (mov_read_default(mov, s->pb, (MOVAtom){ AV_RL32("root"), INT64_MAX }) < 0 ||
avio_feof(s->pb))
return AVERROR_EOF;
av_log(s, AV_LOG_TRACE, "read fragments, offset 0x%"PRIx64"\n", avio_tell(s->pb));
if ((ret = mov_switch_root(s, mov->next_root_atom)) < 0)
return ret;
goto retry;
}
sc = st->priv_data;
@ -4685,12 +4823,41 @@ static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
return 0;
}
static int mov_seek_fragment(AVFormatContext *s, AVStream *st, int64_t timestamp)
{
MOVContext *mov = s->priv_data;
int i, j;
if (!mov->fragment_index_complete)
return 0;
for (i = 0; i < mov->fragment_index_count; i++) {
if (mov->fragment_index_data[i]->track_id == st->id) {
MOVFragmentIndex *index = index = mov->fragment_index_data[i];
for (j = index->item_count - 1; j >= 0; j--) {
if (index->items[j].time <= timestamp) {
if (index->items[j].headers_read)
return 0;
return mov_switch_root(s, index->items[j].moof_offset);
}
}
}
}
return 0;
}
static int mov_seek_stream(AVFormatContext *s, AVStream *st, int64_t timestamp, int flags)
{
MOVStreamContext *sc = st->priv_data;
int sample, time_sample;
int i;
int ret = mov_seek_fragment(s, st, timestamp);
if (ret < 0)
return ret;
sample = av_index_search_timestamp(st, timestamp, flags);
av_log(s, AV_LOG_TRACE, "stream %d, timestamp %"PRId64", sample %d\n", st->index, timestamp, sample);
if (sample < 0 && st->nb_index_entries && timestamp < st->index_entries[0].timestamp)