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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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qtdemux: fragmented support; consider mvex and handle flags and offset fields
This commit is contained in:
Mark Nauwelaerts
parent
4bcad634f8
commit
4790603d31
1 changed files with 206 additions and 30 deletions
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@ -334,6 +334,12 @@ struct _QtDemuxStream
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guint32 ctts_sample_index;
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guint32 ctts_count;
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gint32 ctts_soffset;
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/* fragmented */
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gboolean parsed_trex;
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guint32 def_sample_duration;
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guint32 def_sample_size;
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guint32 def_sample_flags;
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};
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enum QtDemuxState
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@ -1854,18 +1860,120 @@ extract_initial_length_and_fourcc (const guint8 * data, guint64 * plength,
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*pfourcc = fourcc;
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}
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static gboolean
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qtdemux_parse_mehd (GstQTDemux * qtdemux, GstByteReader * br)
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{
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guint32 version;
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guint64 duration;
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if (!gst_byte_reader_get_uint32_be (br, &version))
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goto failed;
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version >>= 24;
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if (version == 1) {
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if (!gst_byte_reader_get_uint64_be (br, &duration))
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goto failed;
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} else {
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guint32 dur;
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if (!gst_byte_reader_get_uint32_be (br, &dur))
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goto failed;
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duration = dur;
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}
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GST_INFO_OBJECT (qtdemux, "mehd duration: %" G_GUINT64_FORMAT, duration);
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qtdemux->duration = duration;
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return TRUE;
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failed:
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{
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GST_DEBUG_OBJECT (qtdemux, "parsing mehd failed");
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return FALSE;
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}
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}
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static gboolean
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qtdemux_parse_trex (GstQTDemux * qtdemux, QtDemuxStream * stream,
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guint32 * ds_duration, guint32 * ds_size, guint32 * ds_flags)
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{
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if (!stream->parsed_trex && qtdemux->moov_node) {
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GNode *mvex, *trex;
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GstByteReader trex_data;
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mvex = qtdemux_tree_get_child_by_type (qtdemux->moov_node, FOURCC_mvex);
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if (mvex) {
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trex = qtdemux_tree_get_child_by_type_full (mvex, FOURCC_trex,
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&trex_data);
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while (trex) {
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guint32 id, dur, size, flags;
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/* skip version/flags */
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if (!gst_byte_reader_skip (&trex_data, 4))
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goto next;
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if (!gst_byte_reader_get_uint32_be (&trex_data, &id))
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goto next;
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if (id != stream->track_id)
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goto next;
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/* sample description index; ignore */
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if (!gst_byte_reader_get_uint32_be (&trex_data, &dur))
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goto next;
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if (!gst_byte_reader_get_uint32_be (&trex_data, &dur))
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goto next;
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if (!gst_byte_reader_get_uint32_be (&trex_data, &size))
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goto next;
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if (!gst_byte_reader_get_uint32_be (&trex_data, &flags))
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goto next;
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GST_DEBUG_OBJECT (qtdemux, "fragment defaults for stream %d; "
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"duration %d, size %d, flags 0x%x", stream->track_id,
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dur, size, flags);
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stream->parsed_trex = TRUE;
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stream->def_sample_duration = dur;
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stream->def_sample_size = size;
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stream->def_sample_flags = flags;
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next:
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/* iterate all siblings */
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trex = qtdemux_tree_get_sibling_by_type_full (trex, FOURCC_trex,
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&trex_data);
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}
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}
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}
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*ds_duration = stream->def_sample_duration;
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*ds_size = stream->def_sample_size;
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*ds_size = stream->def_sample_size;
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/* even then, above values are better than random ... */
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if (G_UNLIKELY (!stream->parsed_trex)) {
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GST_WARNING_OBJECT (qtdemux,
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"failed to find fragment defaults for stream %d", stream->track_id);
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return FALSE;
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}
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return TRUE;
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}
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static gboolean
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qtdemux_parse_trun (GstQTDemux * qtdemux, GstByteReader * trun,
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QtDemuxStream * stream, guint32 mdat_offset,
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guint32 d_sample_duration, guint32 d_sample_size, guint32 * samples_count)
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QtDemuxStream * stream, guint32 d_sample_duration, guint32 d_sample_size,
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guint32 d_sample_flags, guint32 * samples_count, gint64 * base_offset)
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{
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guint64 timestamp;
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guint32 flags, data_offset;
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gint32 data_offset;
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guint32 flags, first_flags = 0;
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gint i;
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guint8 *data;
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guint entry_size, dur_offset, size_offset;
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guint entry_size, dur_offset, size_offset, flags_offset, ct_offset;
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QtDemuxSample *sample;
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GST_LOG_OBJECT (qtdemux, "parsing trun stream %d; "
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"default dur %d, size %d, flags 0x%x, base offset %" G_GUINT64_FORMAT,
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stream->track_id, d_sample_duration, d_sample_size, d_sample_flags,
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data_offset);
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if (!gst_byte_reader_skip (trun, 1) ||
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!gst_byte_reader_get_uint24_be (trun, &flags))
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goto fail;
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@ -1873,32 +1981,50 @@ qtdemux_parse_trun (GstQTDemux * qtdemux, GstByteReader * trun,
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if (!gst_byte_reader_get_uint32_be (trun, samples_count))
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goto fail;
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/*FIXME: handle this flag properly */
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if (flags & TR_DATA_OFFSET) {
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if (!gst_byte_reader_get_uint32_be (trun, &data_offset))
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/* note this is really signed */
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if (!gst_byte_reader_get_int32_be (trun, &data_offset))
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goto fail;
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*base_offset += data_offset;
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}
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if (flags & TR_FIRST_SAMPLE_FLAGS)
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if (!gst_byte_reader_skip (trun, 4))
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goto fail;
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GST_LOG_OBJECT (qtdemux, "trun offset %d, flags 0x%x, entries %d",
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data_offset, flags, *samples_count);
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if (flags & TR_FIRST_SAMPLE_FLAGS) {
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if (G_UNLIKELY (flags & TR_SAMPLE_FLAGS)) {
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GST_DEBUG_OBJECT (qtdemux,
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"invalid flags; SAMPLE and FIRST_SAMPLE present, discarding latter");
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flags ^= TR_FIRST_SAMPLE_FLAGS;
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} else {
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if (!gst_byte_reader_get_uint32_be (trun, &first_flags))
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goto fail;
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GST_LOG_OBJECT (qtdemux, "first flags: 0x%x", first_flags);
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}
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}
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/* FIXME ? spec says other bits should also be checked to determine
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* entry size (and prefix size for that matter) */
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entry_size = 0;
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dur_offset = size_offset = 0;
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if (flags & TR_SAMPLE_DURATION) {
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GST_LOG_OBJECT (qtdemux, "entry duration present");
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dur_offset = entry_size;
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entry_size += 4;
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}
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if (flags & TR_SAMPLE_SIZE) {
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GST_LOG_OBJECT (qtdemux, "entry size present");
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size_offset = entry_size;
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entry_size += 4;
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}
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if (flags & TR_SAMPLE_FLAGS) {
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GST_LOG_OBJECT (qtdemux, "entry flags present");
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flags_offset = entry_size;
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entry_size += 4;
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}
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if (flags & TR_COMPOSITION_TIME_OFFSETS) {
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GST_LOG_OBJECT (qtdemux, "entry ct offset present");
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ct_offset = entry_size;
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entry_size += 4;
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}
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@ -1906,8 +2032,6 @@ qtdemux_parse_trun (GstQTDemux * qtdemux, GstByteReader * trun,
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goto fail;
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data = (guint8 *) gst_byte_reader_peek_data_unchecked (trun);
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data_offset = mdat_offset + 8;
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if (stream->n_samples >=
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QTDEMUX_MAX_SAMPLE_INDEX_SIZE / sizeof (QtDemuxSample))
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goto index_too_big;
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@ -1937,7 +2061,7 @@ qtdemux_parse_trun (GstQTDemux * qtdemux, GstByteReader * trun,
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}
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sample = stream->samples + stream->n_samples;
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for (i = 0; i < *samples_count; i++) {
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guint32 dur, size;
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guint32 dur, size, sflags, ct;
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/* first read sample data */
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if (flags & TR_SAMPLE_DURATION) {
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@ -1950,16 +2074,33 @@ qtdemux_parse_trun (GstQTDemux * qtdemux, GstByteReader * trun,
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} else {
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size = d_sample_size;
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}
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if (flags & TR_FIRST_SAMPLE_FLAGS) {
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if (i == 0) {
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sflags = first_flags;
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} else {
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sflags = d_sample_flags;
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}
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} else if (flags & TR_SAMPLE_FLAGS) {
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sflags = QT_UINT32 (data + flags_offset);
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} else {
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sflags = d_sample_flags;
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}
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if (flags & TR_COMPOSITION_TIME_OFFSETS) {
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ct = QT_UINT32 (data + ct_offset);
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} else {
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ct = 0;
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}
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data += entry_size;
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/* fill the sample information */
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sample->offset = data_offset;
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sample->pts_offset = 0;
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sample->offset = *base_offset;
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sample->pts_offset = ct;
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sample->size = size;
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sample->timestamp = timestamp;
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sample->duration = dur;
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sample->keyframe = (i == 0);
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data_offset += size;
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/* sample-is-difference-sample */
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sample->keyframe = !(sflags & 0x10000);
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*base_offset += size;
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timestamp += dur;
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sample++;
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}
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@ -1991,7 +2132,8 @@ index_too_big:
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static gboolean
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qtdemux_parse_tfhd (GstQTDemux * qtdemux, GstByteReader * tfhd,
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guint32 * track_id, guint32 * default_sample_duration,
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guint32 * default_sample_size)
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guint32 * default_sample_size, guint32 * default_sample_flags,
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gint64 * base_offset)
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{
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guint32 flags;
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@ -2002,9 +2144,8 @@ qtdemux_parse_tfhd (GstQTDemux * qtdemux, GstByteReader * tfhd,
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if (!gst_byte_reader_get_uint32_be (tfhd, track_id))
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goto invalid_track;
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/* FIXME: Handle TF_BASE_DATA_OFFSET properly */
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if (flags & TF_BASE_DATA_OFFSET)
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if (!gst_byte_reader_skip (tfhd, 4))
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if (!gst_byte_reader_get_uint64_be (tfhd, (guint64 *) base_offset))
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goto invalid_track;
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/* FIXME: Handle TF_SAMPLE_DESCRIPTION_INDEX properly */
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@ -2020,6 +2161,10 @@ qtdemux_parse_tfhd (GstQTDemux * qtdemux, GstByteReader * tfhd,
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if (!gst_byte_reader_get_uint32_be (tfhd, default_sample_size))
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goto invalid_track;
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if (flags & TF_DEFAULT_SAMPLE_FLAGS)
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if (!gst_byte_reader_get_uint32_be (tfhd, default_sample_flags))
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goto invalid_track;
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return TRUE;
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invalid_track:
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@ -2035,16 +2180,20 @@ qtdemux_parse_moof (GstQTDemux * qtdemux, const guint8 * buffer, guint length,
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{
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GNode *moof_node, *traf_node, *tfhd_node, *trun_node;
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GstByteReader trun_data, tfhd_data;
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guint32 id = 0, default_sample_size = 0, default_sample_duration = 0;
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guint32 id = 0;
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guint32 ds_size = 0, ds_duration = 0, ds_flags = 0;
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guint32 samples_count = 0;
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guint64 mdat_offset;
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gint64 base_offset;
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mdat_offset = moof_offset + length;
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/* obtain stream defaults */
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qtdemux_parse_trex (qtdemux, stream, &ds_duration, &ds_size, &ds_flags);
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moof_node = g_node_new ((guint8 *) buffer);
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qtdemux_parse_node (qtdemux, moof_node, buffer, length);
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qtdemux_node_dump (qtdemux, moof_node);
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/* default base offset = first byte of moof */
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base_offset = moof_offset;
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traf_node = qtdemux_tree_get_child_by_type (moof_node, FOURCC_traf);
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while (traf_node) {
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/* Fragment Header node */
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@ -2053,19 +2202,26 @@ qtdemux_parse_moof (GstQTDemux * qtdemux, const guint8 * buffer, guint length,
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&tfhd_data);
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if (!tfhd_node)
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goto missing_tfhd;
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if (!qtdemux_parse_tfhd (qtdemux, &tfhd_data, &id, &default_sample_duration,
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&default_sample_size))
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if (!qtdemux_parse_tfhd (qtdemux, &tfhd_data, &id, &ds_duration,
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&ds_size, &ds_flags, &base_offset))
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goto missing_tfhd;
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/* skip trun atoms that don't match the track ID */
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if (id != stream->track_id)
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if (id != stream->track_id) {
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/* lost track of offset here */
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base_offset = -1;
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goto next;
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} else if (base_offset == -1) {
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GST_WARNING_OBJECT (qtdemux, "FIXME: no base_offset for data");
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/* FIXME modify parsing so we don't have this limitation */
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goto missing_tfhd;
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}
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/* Track Run node */
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trun_node =
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qtdemux_tree_get_child_by_type_full (traf_node, FOURCC_trun,
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&trun_data);
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while (trun_node) {
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qtdemux_parse_trun (qtdemux, &trun_data, stream, mdat_offset,
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default_sample_duration, default_sample_size, &samples_count);
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qtdemux_parse_trun (qtdemux, &trun_data, stream,
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ds_duration, ds_size, ds_flags, &samples_count, &base_offset);
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/* iterate all siblings */
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trun_node = qtdemux_tree_get_sibling_by_type_full (trun_node, FOURCC_trun,
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&trun_data);
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@ -7813,6 +7969,7 @@ qtdemux_parse_tree (GstQTDemux * qtdemux)
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GNode *mvhd;
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GNode *trak;
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GNode *udta;
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GNode *mvex;
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gint64 duration;
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guint64 creation_time;
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GstDateTime *datetime = NULL;
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@ -7861,9 +8018,12 @@ qtdemux_parse_tree (GstQTDemux * qtdemux)
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GST_INFO_OBJECT (qtdemux, "timescale: %u", qtdemux->timescale);
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GST_INFO_OBJECT (qtdemux, "duration: %" G_GUINT64_FORMAT, qtdemux->duration);
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/* set duration in the segment info */
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gst_qtdemux_get_duration (qtdemux, &duration);
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gst_segment_set_duration (&qtdemux->segment, GST_FORMAT_TIME, duration);
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/* check for fragmented file and get some (default) data */
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mvex = qtdemux_tree_get_child_by_type (qtdemux->moov_node, FOURCC_mvex);
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if (mvex) {
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/* let track parsing or anyone know weird stuff might happen ... */
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qtdemux->fragmented = TRUE;
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}
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/* parse all traks */
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trak = qtdemux_tree_get_child_by_type (qtdemux->moov_node, FOURCC_trak);
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@ -7872,6 +8032,22 @@ qtdemux_parse_tree (GstQTDemux * qtdemux)
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/* iterate all siblings */
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trak = qtdemux_tree_get_sibling_by_type (trak, FOURCC_trak);
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}
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/* compensate for total duration */
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if (mvex) {
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GNode *mehd;
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GstByteReader mehd_data;
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mehd = qtdemux_tree_get_child_by_type_full (mvex, FOURCC_mehd, &mehd_data);
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if (mehd)
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qtdemux_parse_mehd (qtdemux, &mehd_data);
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}
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/* set duration in the segment info */
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gst_qtdemux_get_duration (qtdemux, &duration);
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if (duration)
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gst_segment_set_duration (&qtdemux->segment, GST_FORMAT_TIME, duration);
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gst_element_no_more_pads (GST_ELEMENT_CAST (qtdemux));
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/* find and push tags, we do this after adding the pads so we can push the
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