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qtmux: Add property for enforcing the creation of chunks in single-stream files

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This is disabled by default as it unnecessarily creates bigger headers
but it is something that is required by some applications and most
notably the Apple ProRes spec.
This commit is contained in:
Sebastian Dröge 2020-04-06 16:25:59 +03:00
parent a3933ea53d
commit cf3fbf57bf
2 changed files with 19 additions and 2 deletions
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20
gst/isomp4/gstqtmux.c
View file

@ -366,6 +366,7 @@ enum
PROP_DO_CTTS,
PROP_INTERLEAVE_BYTES,
PROP_INTERLEAVE_TIME,
PROP_FORCE_CHUNKS,
PROP_MAX_RAW_AUDIO_DRIFT,
PROP_START_GAP_THRESHOLD,
PROP_FORCE_CREATE_TIMECODE_TRAK,
@ -391,6 +392,7 @@ enum
#define DEFAULT_RESERVED_PREFILL FALSE
#define DEFAULT_INTERLEAVE_BYTES 0
#define DEFAULT_INTERLEAVE_TIME 250*GST_MSECOND
#define DEFAULT_FORCE_CHUNKS (FALSE)
#define DEFAULT_MAX_RAW_AUDIO_DRIFT 40 * GST_MSECOND
#define DEFAULT_START_GAP_THRESHOLD 0
#define DEFAULT_FORCE_CREATE_TIMECODE_TRAK FALSE
@ -627,6 +629,10 @@ gst_qt_mux_class_init (GstQTMuxClass * klass)
"Interleave between streams in nanoseconds",
0, G_MAXUINT64, DEFAULT_INTERLEAVE_TIME,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_FORCE_CHUNKS,
g_param_spec_boolean ("force-chunks", "Force Chunks",
"Force multiple chunks to be created even for single-stream files",
DEFAULT_FORCE_CHUNKS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_MAX_RAW_AUDIO_DRIFT,
g_param_spec_uint64 ("max-raw-audio-drift", "Max Raw Audio Drift",
"Maximum allowed drift of raw audio samples vs. timestamps in nanoseconds",
@ -862,6 +868,7 @@ gst_qt_mux_init (GstQTMux * qtmux, GstQTMuxClass * qtmux_klass)
DEFAULT_RESERVED_BYTES_PER_SEC_PER_TRAK;
qtmux->interleave_bytes = DEFAULT_INTERLEAVE_BYTES;
qtmux->interleave_time = DEFAULT_INTERLEAVE_TIME;
qtmux->force_chunks = DEFAULT_FORCE_CHUNKS;
qtmux->max_raw_audio_drift = DEFAULT_MAX_RAW_AUDIO_DRIFT;
qtmux->start_gap_threshold = DEFAULT_START_GAP_THRESHOLD;
qtmux->force_create_timecode_trak = DEFAULT_FORCE_CREATE_TIMECODE_TRAK;
@ -5157,10 +5164,13 @@ find_best_pad (GstQTMux * qtmux)
}
} else {
GST_OBJECT_LOCK (qtmux);
if (GST_ELEMENT (qtmux)->sinkpads->next) {
if (GST_ELEMENT (qtmux)->sinkpads->next || qtmux->force_chunks) {
/* Only switch pads if we have more than one, otherwise
* we can just put everything into a single chunk and save
* a few bytes of offsets
* a few bytes of offsets.
*
* Various applications and the Apple ProRes spec require chunking even
* in case of single stream files.
*/
if (qtmux->current_pad)
GST_DEBUG_OBJECT (qtmux, "Switching from pad %s:%s",
@ -6662,6 +6672,9 @@ gst_qt_mux_get_property (GObject * object,
case PROP_INTERLEAVE_TIME:
g_value_set_uint64 (value, qtmux->interleave_time);
break;
case PROP_FORCE_CHUNKS:
g_value_set_boolean (value, qtmux->force_chunks);
break;
case PROP_MAX_RAW_AUDIO_DRIFT:
g_value_set_uint64 (value, qtmux->max_raw_audio_drift);
break;
@ -6759,6 +6772,9 @@ gst_qt_mux_set_property (GObject * object,
qtmux->interleave_time = g_value_get_uint64 (value);
qtmux->interleave_time_set = TRUE;
break;
case PROP_FORCE_CHUNKS:
qtmux->force_chunks = g_value_get_boolean (value);
break;
case PROP_MAX_RAW_AUDIO_DRIFT:
qtmux->max_raw_audio_drift = g_value_get_uint64 (value);
break;

1
gst/isomp4/gstqtmux.h
View file

@ -289,6 +289,7 @@ struct _GstQTMux
guint64 interleave_bytes;
GstClockTime interleave_time;
gboolean interleave_bytes_set, interleave_time_set;
gboolean force_chunks;
GstClockTime max_raw_audio_drift;