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gstreamer/gst/flv/gstflvmux.c
Seungha Yang 1cd5a5241f flvmux: Don't omit streamheader from caps on downstream reconfigure 
The reconfigured downstream elements (e.g., dynamically added sink element)
most likely require the flv streamheader

https://bugzilla.gnome.org/show_bug.cgi?id=797089
2018-09-06 15:52:09 -04:00

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/* GStreamer
*
* Copyright (c) 2008,2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>
* Copyright (c) 2008-2017 Collabora Ltd
* @author: Sebastian Dröge <sebastian.droege@collabora.co.uk>
* @author: Vincent Penquerc'h <vincent.penquerch@collabora.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-flvmux
*
* flvmux muxes different streams into an FLV file.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch-1.0 -v flvmux name=mux ! filesink location=test.flv audiotestsrc samplesperbuffer=44100 num-buffers=10 ! faac ! mux. videotestsrc num-buffers=250 ! video/x-raw,framerate=25/1 ! x264enc ! mux.
* ]| This pipeline encodes a test audio and video stream and muxes both into an FLV file.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <string.h>
#include <gst/audio/audio.h>
#include "gstflvmux.h"
#include "amfdefs.h"
GST_DEBUG_CATEGORY_STATIC (flvmux_debug);
#define GST_CAT_DEFAULT flvmux_debug
enum
{
PROP_0,
PROP_STREAMABLE,
PROP_METADATACREATOR
};
#define DEFAULT_STREAMABLE FALSE
#define MAX_INDEX_ENTRIES 128
#define DEFAULT_METADATACREATOR "GStreamer " PACKAGE_VERSION " FLV muxer"
static GstStaticPadTemplate src_templ = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-flv")
);
static GstStaticPadTemplate videosink_templ = GST_STATIC_PAD_TEMPLATE ("video",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS ("video/x-flash-video; "
"video/x-flash-screen; "
"video/x-vp6-flash; " "video/x-vp6-alpha; "
"video/x-h264, stream-format=avc;")
);
static GstStaticPadTemplate audiosink_templ = GST_STATIC_PAD_TEMPLATE ("audio",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS
("audio/x-adpcm, layout = (string) swf, channels = (int) { 1, 2 }, rate = (int) { 5512, 11025, 22050, 44100 }; "
"audio/mpeg, mpegversion = (int) 1, layer = (int) 3, channels = (int) { 1, 2 }, rate = (int) { 5512, 8000, 11025, 22050, 44100 }, parsed = (boolean) TRUE; "
"audio/mpeg, mpegversion = (int) { 4, 2 }, stream-format = (string) raw; "
"audio/x-nellymoser, channels = (int) { 1, 2 }, rate = (int) { 5512, 8000, 11025, 16000, 22050, 44100 }; "
"audio/x-raw, format = (string) { U8, S16LE}, layout = (string) interleaved, channels = (int) { 1, 2 }, rate = (int) { 5512, 11025, 22050, 44100 }; "
"audio/x-alaw, channels = (int) { 1, 2 }, rate = (int) { 5512, 11025, 22050, 44100 }; "
"audio/x-mulaw, channels = (int) { 1, 2 }, rate = (int) { 5512, 11025, 22050, 44100 }; "
"audio/x-speex, channels = (int) 1, rate = (int) 16000;")
);
G_DEFINE_TYPE (GstFlvMuxPad, gst_flv_mux_pad, GST_TYPE_AGGREGATOR_PAD);
#define gst_flv_mux_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstFlvMux, gst_flv_mux, GST_TYPE_AGGREGATOR,
G_IMPLEMENT_INTERFACE (GST_TYPE_TAG_SETTER, NULL));
static GstFlowReturn
gst_flv_mux_aggregate (GstAggregator * aggregator, gboolean timeout);
static gboolean
gst_flv_mux_sink_event (GstAggregator * aggregator, GstAggregatorPad * pad,
GstEvent * event);
static GstAggregatorPad *gst_flv_mux_create_new_pad (GstAggregator * agg,
GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps);
static void gst_flv_mux_release_pad (GstElement * element, GstPad * pad);
static gboolean gst_flv_mux_video_pad_setcaps (GstFlvMuxPad * pad,
GstCaps * caps);
static gboolean gst_flv_mux_audio_pad_setcaps (GstFlvMuxPad * pad,
GstCaps * caps);
static void gst_flv_mux_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static void gst_flv_mux_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec);
static void gst_flv_mux_finalize (GObject * object);
static void gst_flv_mux_reset (GstElement * element);
static void gst_flv_mux_reset_pad (GstFlvMuxPad * pad);
static void gst_flv_mux_pad_finalize (GObject * object);
static gboolean gst_flv_mux_start (GstAggregator * aggregator);
static GstFlowReturn gst_flv_mux_flush (GstAggregator * aggregator);
static GstClockTime gst_flv_mux_get_next_time (GstAggregator * aggregator);
static GstFlowReturn gst_flv_mux_write_eos (GstFlvMux * mux);
static GstFlowReturn gst_flv_mux_write_header (GstFlvMux * mux);
static GstFlowReturn gst_flv_mux_rewrite_header (GstFlvMux * mux);
static gboolean gst_flv_mux_are_all_pads_eos (GstFlvMux * mux);
static GstFlowReturn gst_flv_mux_update_src_caps (GstAggregator * aggregator,
GstCaps * caps, GstCaps ** ret);
static GstFlowReturn
gst_flv_mux_pad_flush (GstAggregatorPad * pad, GstAggregator * aggregator)
{
GstFlvMuxPad *flvpad = GST_FLV_MUX_PAD (pad);
flvpad->last_timestamp = 0;
flvpad->pts = GST_CLOCK_STIME_NONE;
flvpad->dts = GST_CLOCK_STIME_NONE;
return GST_FLOW_OK;
}
static void
gst_flv_mux_pad_class_init (GstFlvMuxPadClass * klass)
{
GstAggregatorPadClass *aggregatorpad_class = (GstAggregatorPadClass *) klass;
GObjectClass *gobject_class = (GObjectClass *) klass;
gobject_class->finalize = gst_flv_mux_pad_finalize;
aggregatorpad_class->flush = GST_DEBUG_FUNCPTR (gst_flv_mux_pad_flush);
}
static void
gst_flv_mux_pad_init (GstFlvMuxPad * pad)
{
gst_flv_mux_reset_pad (pad);
}
typedef struct
{
gdouble position;
gdouble time;
} GstFlvMuxIndexEntry;
static void
gst_flv_mux_index_entry_free (GstFlvMuxIndexEntry * entry)
{
g_slice_free (GstFlvMuxIndexEntry, entry);
}
static GstBuffer *
_gst_buffer_new_wrapped (gpointer mem, gsize size, GFreeFunc free_func)
{
GstBuffer *buf;
buf = gst_buffer_new ();
gst_buffer_append_memory (buf,
gst_memory_new_wrapped (free_func ? 0 : GST_MEMORY_FLAG_READONLY,
mem, size, 0, size, mem, free_func));
return buf;
}
static void
_gst_buffer_new_and_alloc (gsize size, GstBuffer ** buffer, guint8 ** data)
{
g_return_if_fail (data != NULL);
g_return_if_fail (buffer != NULL);
*data = g_malloc (size);
*buffer = _gst_buffer_new_wrapped (*data, size, g_free);
}
static void
gst_flv_mux_class_init (GstFlvMuxClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstAggregatorClass *gstaggregator_class;
GST_DEBUG_CATEGORY_INIT (flvmux_debug, "flvmux", 0, "FLV muxer");
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstaggregator_class = (GstAggregatorClass *) klass;
gobject_class->get_property = gst_flv_mux_get_property;
gobject_class->set_property = gst_flv_mux_set_property;
gobject_class->finalize = gst_flv_mux_finalize;
/* FIXME: ideally the right mode of operation should be detected
* automatically using queries when parameter not specified. */
/**
* GstFlvMux:streamable
*
* If True, the output will be streaming friendly. (ie without indexes and
* duration)
*/
g_object_class_install_property (gobject_class, PROP_STREAMABLE,
g_param_spec_boolean ("streamable", "streamable",
"If set to true, the output should be as if it is to be streamed "
"and hence no indexes written or duration written.",
DEFAULT_STREAMABLE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_METADATACREATOR,
g_param_spec_string ("metadatacreator", "metadatacreator",
"The value of metadatacreator in the meta packet.",
NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstaggregator_class->create_new_pad =
GST_DEBUG_FUNCPTR (gst_flv_mux_create_new_pad);
gstelement_class->release_pad = GST_DEBUG_FUNCPTR (gst_flv_mux_release_pad);
gstaggregator_class->start = GST_DEBUG_FUNCPTR (gst_flv_mux_start);
gstaggregator_class->aggregate = GST_DEBUG_FUNCPTR (gst_flv_mux_aggregate);
gstaggregator_class->sink_event = GST_DEBUG_FUNCPTR (gst_flv_mux_sink_event);
gstaggregator_class->flush = GST_DEBUG_FUNCPTR (gst_flv_mux_flush);
gstaggregator_class->get_next_time =
GST_DEBUG_FUNCPTR (gst_flv_mux_get_next_time);
gstaggregator_class->update_src_caps =
GST_DEBUG_FUNCPTR (gst_flv_mux_update_src_caps);
gst_element_class_add_static_pad_template_with_gtype (gstelement_class,
&videosink_templ, GST_TYPE_FLV_MUX_PAD);
gst_element_class_add_static_pad_template_with_gtype (gstelement_class,
&audiosink_templ, GST_TYPE_FLV_MUX_PAD);
gst_element_class_add_static_pad_template_with_gtype (gstelement_class,
&src_templ, GST_TYPE_AGGREGATOR_PAD);
gst_element_class_set_static_metadata (gstelement_class, "FLV muxer",
"Codec/Muxer",
"Muxes video/audio streams into a FLV stream",
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
GST_DEBUG_CATEGORY_INIT (flvmux_debug, "flvmux", 0, "FLV muxer");
}
static void
gst_flv_mux_init (GstFlvMux * mux)
{
mux->srcpad = GST_AGGREGATOR_CAST (mux)->srcpad;
/* property */
mux->streamable = DEFAULT_STREAMABLE;
mux->metadatacreator = g_strdup (DEFAULT_METADATACREATOR);
mux->new_tags = FALSE;
gst_flv_mux_reset (GST_ELEMENT (mux));
}
static void
gst_flv_mux_finalize (GObject * object)
{
GstFlvMux *mux = GST_FLV_MUX (object);
gst_flv_mux_reset (GST_ELEMENT (object));
g_free (mux->metadatacreator);
G_OBJECT_CLASS (gst_flv_mux_parent_class)->finalize (object);
}
static void
gst_flv_mux_pad_finalize (GObject * object)
{
GstFlvMuxPad *pad = GST_FLV_MUX_PAD (object);
gst_flv_mux_reset_pad (pad);
G_OBJECT_CLASS (gst_flv_mux_pad_parent_class)->finalize (object);
}
static GstFlowReturn
gst_flv_mux_flush (GstAggregator * aggregator)
{
/* TODO: What is the right behaviour on flush? Should we just ignore it ?
* This still needs to be defined. */
gst_flv_mux_reset (GST_ELEMENT (aggregator));
return GST_FLOW_OK;
}
static gboolean
gst_flv_mux_start (GstAggregator * aggregator)
{
gst_flv_mux_reset (GST_ELEMENT (aggregator));
return TRUE;
}
static void
gst_flv_mux_reset (GstElement * element)
{
GstFlvMux *mux = GST_FLV_MUX (element);
g_list_foreach (mux->index, (GFunc) gst_flv_mux_index_entry_free, NULL);
g_list_free (mux->index);
mux->index = NULL;
mux->byte_count = 0;
mux->duration = GST_CLOCK_TIME_NONE;
mux->new_tags = FALSE;
mux->first_timestamp = GST_CLOCK_STIME_NONE;
mux->state = GST_FLV_MUX_STATE_HEADER;
/* tags */
gst_tag_setter_reset_tags (GST_TAG_SETTER (mux));
}
/* Extract per-codec relevant tags for
* insertion into the metadata later - ie bitrate,
* but maybe others in the future */
static void
gst_flv_mux_store_codec_tags (GstFlvMux * mux,
GstFlvMuxPad * flvpad, GstTagList * list)
{
/* Look for a bitrate as either nominal or actual bitrate tag */
if (gst_tag_list_get_uint (list, GST_TAG_NOMINAL_BITRATE, &flvpad->bitrate)
|| gst_tag_list_get_uint (list, GST_TAG_BITRATE, &flvpad->bitrate)) {
GST_DEBUG_OBJECT (mux, "Stored bitrate for pad %" GST_PTR_FORMAT " = %u",
flvpad, flvpad->bitrate);
}
}
static gboolean
gst_flv_mux_sink_event (GstAggregator * aggregator, GstAggregatorPad * pad,
GstEvent * event)
{
GstFlvMux *mux = GST_FLV_MUX (aggregator);
GstFlvMuxPad *flvpad = (GstFlvMuxPad *) pad;
gboolean ret = TRUE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
if (mux->video_pad == flvpad) {
ret = gst_flv_mux_video_pad_setcaps (flvpad, caps);
} else if (mux->audio_pad == flvpad) {
ret = gst_flv_mux_audio_pad_setcaps (flvpad, caps);
} else {
g_assert_not_reached ();
}
break;
}
case GST_EVENT_TAG:{
GstTagList *list;
GstTagSetter *setter = GST_TAG_SETTER (mux);
const GstTagMergeMode mode = gst_tag_setter_get_tag_merge_mode (setter);
gst_event_parse_tag (event, &list);
gst_tag_setter_merge_tags (setter, list, mode);
gst_flv_mux_store_codec_tags (mux, flvpad, list);
mux->new_tags = TRUE;
ret = TRUE;
break;
}
default:
break;
}
if (!ret)
return FALSE;
return GST_AGGREGATOR_CLASS (parent_class)->sink_event (aggregator, pad,
event);;
}
static gboolean
gst_flv_mux_video_pad_setcaps (GstFlvMuxPad * pad, GstCaps * caps)
{
GstFlvMux *mux = GST_FLV_MUX (gst_pad_get_parent (pad));
gboolean ret = TRUE;
GstStructure *s;
s = gst_caps_get_structure (caps, 0);
if (strcmp (gst_structure_get_name (s), "video/x-flash-video") == 0) {
pad->codec = 2;
} else if (strcmp (gst_structure_get_name (s), "video/x-flash-screen") == 0) {
pad->codec = 3;
} else if (strcmp (gst_structure_get_name (s), "video/x-vp6-flash") == 0) {
pad->codec = 4;
} else if (strcmp (gst_structure_get_name (s), "video/x-vp6-alpha") == 0) {
pad->codec = 5;
} else if (strcmp (gst_structure_get_name (s), "video/x-h264") == 0) {
pad->codec = 7;
} else {
ret = FALSE;
}
if (ret && gst_structure_has_field (s, "codec_data")) {
const GValue *val = gst_structure_get_value (s, "codec_data");
if (val)
pad->codec_data = gst_buffer_ref (gst_value_get_buffer (val));
}
gst_object_unref (mux);
return ret;
}
static gboolean
gst_flv_mux_audio_pad_setcaps (GstFlvMuxPad * pad, GstCaps * caps)
{
GstFlvMux *mux = GST_FLV_MUX (gst_pad_get_parent (pad));
gboolean ret = TRUE;
GstStructure *s;
s = gst_caps_get_structure (caps, 0);
if (strcmp (gst_structure_get_name (s), "audio/x-adpcm") == 0) {
const gchar *layout = gst_structure_get_string (s, "layout");
if (layout && strcmp (layout, "swf") == 0) {
pad->codec = 1;
} else {
ret = FALSE;
}
} else if (strcmp (gst_structure_get_name (s), "audio/mpeg") == 0) {
gint mpegversion;
if (gst_structure_get_int (s, "mpegversion", &mpegversion)) {
if (mpegversion == 1) {
gint layer;
if (gst_structure_get_int (s, "layer", &layer) && layer == 3) {
gint rate;
if (gst_structure_get_int (s, "rate", &rate) && rate == 8000)
pad->codec = 14;
else
pad->codec = 2;
} else {
ret = FALSE;
}
} else if (mpegversion == 4 || mpegversion == 2) {
pad->codec = 10;
} else {
ret = FALSE;
}
} else {
ret = FALSE;
}
} else if (strcmp (gst_structure_get_name (s), "audio/x-nellymoser") == 0) {
gint rate, channels;
if (gst_structure_get_int (s, "rate", &rate)
&& gst_structure_get_int (s, "channels", &channels)) {
if (channels == 1 && rate == 16000)
pad->codec = 4;
else if (channels == 1 && rate == 8000)
pad->codec = 5;
else
pad->codec = 6;
} else {
pad->codec = 6;
}
} else if (strcmp (gst_structure_get_name (s), "audio/x-raw") == 0) {
GstAudioInfo info;
if (gst_audio_info_from_caps (&info, caps)) {
pad->codec = 3;
if (GST_AUDIO_INFO_WIDTH (&info) == 8)
pad->width = 0;
else if (GST_AUDIO_INFO_WIDTH (&info) == 16)
pad->width = 1;
else
ret = FALSE;
} else
ret = FALSE;
} else if (strcmp (gst_structure_get_name (s), "audio/x-alaw") == 0) {
pad->codec = 7;
} else if (strcmp (gst_structure_get_name (s), "audio/x-mulaw") == 0) {
pad->codec = 8;
} else if (strcmp (gst_structure_get_name (s), "audio/x-speex") == 0) {
pad->codec = 11;
} else {
ret = FALSE;
}
if (ret) {
gint rate, channels;
if (gst_structure_get_int (s, "rate", &rate)) {
if (pad->codec == 10)
pad->rate = 3;
else if (rate == 5512)
pad->rate = 0;
else if (rate == 11025)
pad->rate = 1;
else if (rate == 22050)
pad->rate = 2;
else if (rate == 44100)
pad->rate = 3;
else if (rate == 8000 && (pad->codec == 5 || pad->codec == 14))
pad->rate = 0;
else if (rate == 16000 && (pad->codec == 4 || pad->codec == 11))
pad->rate = 0;
else
ret = FALSE;
} else if (pad->codec == 10) {
pad->rate = 3;
} else {
ret = FALSE;
}
if (gst_structure_get_int (s, "channels", &channels)) {
if (pad->codec == 4 || pad->codec == 5
|| pad->codec == 6 || pad->codec == 11)
pad->channels = 0;
else if (pad->codec == 10)
pad->channels = 1;
else if (channels == 1)
pad->channels = 0;
else if (channels == 2)
pad->channels = 1;
else
ret = FALSE;
} else if (pad->codec == 4 || pad->codec == 5 || pad->codec == 6) {
pad->channels = 0;
} else if (pad->codec == 10) {
pad->channels = 1;
} else {
ret = FALSE;
}
if (pad->codec != 3)
pad->width = 1;
}
if (ret && gst_structure_has_field (s, "codec_data")) {
const GValue *val = gst_structure_get_value (s, "codec_data");
if (val)
pad->codec_data = gst_buffer_ref (gst_value_get_buffer (val));
}
gst_object_unref (mux);
return ret;
}
static void
gst_flv_mux_reset_pad (GstFlvMuxPad * pad)
{
GST_DEBUG_OBJECT (pad, "resetting pad");
if (pad->codec_data)
gst_buffer_unref (pad->codec_data);
pad->codec_data = NULL;
pad->codec = G_MAXUINT;
pad->rate = G_MAXUINT;
pad->width = G_MAXUINT;
pad->channels = G_MAXUINT;
gst_flv_mux_pad_flush (GST_AGGREGATOR_PAD_CAST (pad), NULL);
}
static GstAggregatorPad *
gst_flv_mux_create_new_pad (GstAggregator * agg,
GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (agg);
GstAggregatorPad *aggpad;
GstFlvMux *mux = GST_FLV_MUX (agg);
GstFlvMuxPad *pad = NULL;
const gchar *name = NULL;
gboolean video;
if (mux->state != GST_FLV_MUX_STATE_HEADER) {
GST_WARNING_OBJECT (mux, "Can't request pads after writing header");
return NULL;
}
if (templ == gst_element_class_get_pad_template (klass, "audio")) {
if (mux->audio_pad) {
GST_WARNING_OBJECT (mux, "Already have an audio pad");
return NULL;
}
name = "audio";
video = FALSE;
} else if (templ == gst_element_class_get_pad_template (klass, "video")) {
if (mux->video_pad) {
GST_WARNING_OBJECT (mux, "Already have a video pad");
return NULL;
}
name = "video";
video = TRUE;
} else {
GST_WARNING_OBJECT (mux, "Invalid template");
return NULL;
}
aggpad =
GST_AGGREGATOR_CLASS (gst_flv_mux_parent_class)->create_new_pad (agg,
templ, name, caps);
if (aggpad == NULL)
return NULL;
pad = GST_FLV_MUX_PAD (aggpad);
gst_flv_mux_reset_pad (pad);
if (video)
mux->video_pad = pad;
else
mux->audio_pad = pad;
return aggpad;
}
static void
gst_flv_mux_release_pad (GstElement * element, GstPad * pad)
{
GstFlvMux *mux = GST_FLV_MUX (element);
GstFlvMuxPad *flvpad = GST_FLV_MUX_PAD (pad);
gst_pad_set_active (pad, FALSE);
gst_flv_mux_reset_pad (flvpad);
if (flvpad == mux->video_pad) {
mux->video_pad = NULL;
} else if (flvpad == mux->audio_pad) {
mux->audio_pad = NULL;
} else {
GST_WARNING_OBJECT (pad, "Pad is not known audio or video pad");
}
gst_element_remove_pad (element, pad);
}
static GstFlowReturn
gst_flv_mux_push (GstFlvMux * mux, GstBuffer * buffer)
{
GstAggregator *agg = GST_AGGREGATOR (mux);
GstAggregatorPad *srcpad = GST_AGGREGATOR_PAD (agg->srcpad);
if (GST_BUFFER_PTS_IS_VALID (buffer))
srcpad->segment.position = GST_BUFFER_PTS (buffer);
/* pushing the buffer that rewrites the header will make it no longer be the
* total output size in bytes, but it doesn't matter at that point */
mux->byte_count += gst_buffer_get_size (buffer);
return gst_aggregator_finish_buffer (GST_AGGREGATOR_CAST (mux), buffer);
}
static GstBuffer *
gst_flv_mux_create_header (GstFlvMux * mux)
{
GstBuffer *header;
guint8 *data;
gboolean have_audio;
gboolean have_video;
_gst_buffer_new_and_alloc (9 + 4, &header, &data);
data[0] = 'F';
data[1] = 'L';
data[2] = 'V';
data[3] = 0x01; /* Version */
have_audio = (mux->audio_pad && mux->audio_pad->codec != G_MAXUINT);
have_video = (mux->video_pad && mux->video_pad->codec != G_MAXUINT);
data[4] = (have_audio << 2) | have_video; /* flags */
GST_WRITE_UINT32_BE (data + 5, 9); /* data offset */
GST_WRITE_UINT32_BE (data + 9, 0); /* previous tag size */
return header;
}
static GstBuffer *
gst_flv_mux_preallocate_index (GstFlvMux * mux)
{
GstBuffer *tmp;
guint8 *data;
gint preallocate_size;
/* preallocate index of size:
* - 'keyframes' ECMA array key: 2 + 9 = 11 bytes
* - nested ECMA array header, length and end marker: 8 bytes
* - 'times' and 'filepositions' keys: 22 bytes
* - two strict arrays headers and lengths: 10 bytes
* - each index entry: 18 bytes
*/
preallocate_size = 11 + 8 + 22 + 10 + MAX_INDEX_ENTRIES * 18;
GST_DEBUG_OBJECT (mux, "preallocating %d bytes for the index",
preallocate_size);
_gst_buffer_new_and_alloc (preallocate_size, &tmp, &data);
/* prefill the space with a gstfiller: <spaces> script tag variable */
GST_WRITE_UINT16_BE (data, 9); /* 9 characters */
memcpy (data + 2, "gstfiller", 9);
GST_WRITE_UINT8 (data + 11, AMF0_STRING_MARKER); /* a string value */
GST_WRITE_UINT16_BE (data + 12, preallocate_size - 14);
memset (data + 14, ' ', preallocate_size - 14); /* the rest is spaces */
return tmp;
}
static GstBuffer *
gst_flv_mux_create_number_script_value (const gchar * name, gdouble value)
{
GstBuffer *tmp;
guint8 *data;
gsize len = strlen (name);
_gst_buffer_new_and_alloc (2 + len + 1 + 8, &tmp, &data);
GST_WRITE_UINT16_BE (data, len);
data += 2; /* name length */
memcpy (data, name, len);
data += len;
*data++ = AMF0_NUMBER_MARKER; /* double type */
GST_WRITE_DOUBLE_BE (data, value);
return tmp;
}
static GstBuffer *
gst_flv_mux_create_metadata (GstFlvMux * mux, gboolean full)
{
const GstTagList *tags;
GstBuffer *script_tag, *tmp;
GstMapInfo map;
guint8 *data;
gint i, n_tags, tags_written = 0;
tags = gst_tag_setter_get_tag_list (GST_TAG_SETTER (mux));
GST_DEBUG_OBJECT (mux, "tags = %" GST_PTR_FORMAT, tags);
/* FIXME perhaps some bytewriter'ing here ... */
_gst_buffer_new_and_alloc (11, &script_tag, &data);
data[0] = 18;
/* Data size, unknown for now */
data[1] = 0;
data[2] = 0;
data[3] = 0;
/* Timestamp */
data[4] = data[5] = data[6] = data[7] = 0;
/* Stream ID */
data[8] = data[9] = data[10] = 0;
_gst_buffer_new_and_alloc (13, &tmp, &data);
data[0] = AMF0_STRING_MARKER; /* string */
data[1] = 0;
data[2] = 10; /* length 10 */
memcpy (&data[3], "onMetaData", 10);
script_tag = gst_buffer_append (script_tag, tmp);
n_tags = (tags) ? gst_tag_list_n_tags (tags) : 0;
_gst_buffer_new_and_alloc (5, &tmp, &data);
data[0] = 8; /* ECMA array */
GST_WRITE_UINT32_BE (data + 1, n_tags);
script_tag = gst_buffer_append (script_tag, tmp);
if (!full)
goto tags;
/* Some players expect the 'duration' to be always set. Fill it out later,
after querying the pads or after getting EOS */
if (!mux->streamable) {
tmp = gst_flv_mux_create_number_script_value ("duration", 86400);
script_tag = gst_buffer_append (script_tag, tmp);
tags_written++;
/* Sometimes the information about the total file size is useful for the
player. It will be filled later, after getting EOS */
tmp = gst_flv_mux_create_number_script_value ("filesize", 0);
script_tag = gst_buffer_append (script_tag, tmp);
tags_written++;
/* Preallocate space for the index to be written at EOS */
tmp = gst_flv_mux_preallocate_index (mux);
script_tag = gst_buffer_append (script_tag, tmp);
} else {
GST_DEBUG_OBJECT (mux, "not preallocating index, streamable mode");
}
tags:
for (i = 0; tags && i < n_tags; i++) {
const gchar *tag_name = gst_tag_list_nth_tag_name (tags, i);
if (!strcmp (tag_name, GST_TAG_DURATION)) {
guint64 dur;
if (!gst_tag_list_get_uint64 (tags, GST_TAG_DURATION, &dur))
continue;
mux->duration = dur;
} else if (!strcmp (tag_name, GST_TAG_ARTIST) ||
!strcmp (tag_name, GST_TAG_TITLE)) {
gchar *s;
const gchar *t = NULL;
if (!strcmp (tag_name, GST_TAG_ARTIST))
t = "creator";
else if (!strcmp (tag_name, GST_TAG_TITLE))
t = "title";
if (!gst_tag_list_get_string (tags, tag_name, &s))
continue;
_gst_buffer_new_and_alloc (2 + strlen (t) + 1 + 2 + strlen (s),
&tmp, &data);
data[0] = 0; /* tag name length */
data[1] = strlen (t);
memcpy (&data[2], t, strlen (t));
data[2 + strlen (t)] = 2; /* string */
data[3 + strlen (t)] = (strlen (s) >> 8) & 0xff;
data[4 + strlen (t)] = (strlen (s)) & 0xff;
memcpy (&data[5 + strlen (t)], s, strlen (s));
script_tag = gst_buffer_append (script_tag, tmp);
g_free (s);
tags_written++;
}
}
if (!full)
goto end;
if (mux->duration == GST_CLOCK_TIME_NONE) {
GList *l;
guint64 dur;
for (l = GST_ELEMENT_CAST (mux)->sinkpads; l; l = l->next) {
GstFlvMuxPad *pad = GST_FLV_MUX_PAD (l->data);
if (gst_pad_peer_query_duration (GST_PAD (pad), GST_FORMAT_TIME,
(gint64 *) & dur) && dur != GST_CLOCK_TIME_NONE) {
if (mux->duration == GST_CLOCK_TIME_NONE)
mux->duration = dur;
else
mux->duration = MAX (dur, mux->duration);
}
}
}
if (!mux->streamable && mux->duration != GST_CLOCK_TIME_NONE) {
gdouble d;
GstMapInfo map;
d = gst_guint64_to_gdouble (mux->duration);
d /= (gdouble) GST_SECOND;
GST_DEBUG_OBJECT (mux, "determined the duration to be %f", d);
gst_buffer_map (script_tag, &map, GST_MAP_WRITE);
GST_WRITE_DOUBLE_BE (map.data + 29 + 2 + 8 + 1, d);
gst_buffer_unmap (script_tag, &map);
}
if (mux->video_pad && mux->video_pad->codec != G_MAXUINT) {
GstCaps *caps = NULL;
if (mux->video_pad)
caps = gst_pad_get_current_caps (GST_PAD (mux->video_pad));
if (caps != NULL) {
GstStructure *s;
gint size;
gint num, den;
GST_DEBUG_OBJECT (mux, "putting videocodecid %d in the metadata",
mux->video_pad->codec);
tmp = gst_flv_mux_create_number_script_value ("videocodecid",
mux->video_pad->codec);
script_tag = gst_buffer_append (script_tag, tmp);
tags_written++;
s = gst_caps_get_structure (caps, 0);
gst_caps_unref (caps);
if (gst_structure_get_int (s, "width", &size)) {
GST_DEBUG_OBJECT (mux, "putting width %d in the metadata", size);
tmp = gst_flv_mux_create_number_script_value ("width", size);
script_tag = gst_buffer_append (script_tag, tmp);
tags_written++;
}
if (gst_structure_get_int (s, "height", &size)) {
GST_DEBUG_OBJECT (mux, "putting height %d in the metadata", size);
tmp = gst_flv_mux_create_number_script_value ("height", size);
script_tag = gst_buffer_append (script_tag, tmp);
tags_written++;
}
if (gst_structure_get_fraction (s, "pixel-aspect-ratio", &num, &den)) {
gdouble d;
d = num;
GST_DEBUG_OBJECT (mux, "putting AspectRatioX %f in the metadata", d);
tmp = gst_flv_mux_create_number_script_value ("AspectRatioX", d);
script_tag = gst_buffer_append (script_tag, tmp);
tags_written++;
d = den;
GST_DEBUG_OBJECT (mux, "putting AspectRatioY %f in the metadata", d);
tmp = gst_flv_mux_create_number_script_value ("AspectRatioY", d);
script_tag = gst_buffer_append (script_tag, tmp);
tags_written++;
}
if (gst_structure_get_fraction (s, "framerate", &num, &den)) {
gdouble d;
gst_util_fraction_to_double (num, den, &d);
GST_DEBUG_OBJECT (mux, "putting framerate %f in the metadata", d);
tmp = gst_flv_mux_create_number_script_value ("framerate", d);
script_tag = gst_buffer_append (script_tag, tmp);
tags_written++;
}
GST_DEBUG_OBJECT (mux, "putting videodatarate %u KB/s in the metadata",
mux->video_pad->bitrate / 1024);
tmp = gst_flv_mux_create_number_script_value ("videodatarate",
mux->video_pad->bitrate / 1024);
script_tag = gst_buffer_append (script_tag, tmp);
tags_written++;
}
}
if (mux->audio_pad && mux->audio_pad->codec != G_MAXUINT) {
GST_DEBUG_OBJECT (mux, "putting audiocodecid %d in the metadata",
mux->audio_pad->codec);
tmp = gst_flv_mux_create_number_script_value ("audiocodecid",
mux->audio_pad->codec);
script_tag = gst_buffer_append (script_tag, tmp);
tags_written++;
GST_DEBUG_OBJECT (mux, "putting audiodatarate %u KB/s in the metadata",
mux->audio_pad->bitrate / 1024);
tmp = gst_flv_mux_create_number_script_value ("audiodatarate",
mux->audio_pad->bitrate / 1024);
script_tag = gst_buffer_append (script_tag, tmp);
tags_written++;
}
_gst_buffer_new_and_alloc (2 + 15 + 1 + 2 + strlen (mux->metadatacreator),
&tmp, &data);
data[0] = 0; /* 15 bytes name */
data[1] = 15;
memcpy (&data[2], "metadatacreator", 15);
data[17] = 2; /* string */
data[18] = (strlen (mux->metadatacreator) >> 8) & 0xff;
data[19] = (strlen (mux->metadatacreator)) & 0xff;
memcpy (&data[20], mux->metadatacreator, strlen (mux->metadatacreator));
script_tag = gst_buffer_append (script_tag, tmp);
tags_written++;
{
GTimeVal tv = { 0, };
time_t secs;
struct tm *tm;
gchar *s;
static const gchar *weekdays[] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
static const gchar *months[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul",
"Aug", "Sep", "Oct", "Nov", "Dec"
};
g_get_current_time (&tv);
secs = tv.tv_sec;
tm = gmtime (&secs);
s = g_strdup_printf ("%s %s %d %02d:%02d:%02d %d", weekdays[tm->tm_wday],
months[tm->tm_mon], tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec,
tm->tm_year + 1900);
_gst_buffer_new_and_alloc (2 + 12 + 1 + 2 + strlen (s), &tmp, &data);
data[0] = 0; /* 12 bytes name */
data[1] = 12;
memcpy (&data[2], "creationdate", 12);
data[14] = 2; /* string */
data[15] = (strlen (s) >> 8) & 0xff;
data[16] = (strlen (s)) & 0xff;
memcpy (&data[17], s, strlen (s));
script_tag = gst_buffer_append (script_tag, tmp);
g_free (s);
tags_written++;
}
end:
if (!tags_written) {
gst_buffer_unref (script_tag);
script_tag = NULL;
goto exit;
}
_gst_buffer_new_and_alloc (2 + 0 + 1, &tmp, &data);
data[0] = 0; /* 0 byte size */
data[1] = 0;
data[2] = 9; /* end marker */
script_tag = gst_buffer_append (script_tag, tmp);
_gst_buffer_new_and_alloc (4, &tmp, &data);
GST_WRITE_UINT32_BE (data, gst_buffer_get_size (script_tag));
script_tag = gst_buffer_append (script_tag, tmp);
gst_buffer_map (script_tag, &map, GST_MAP_WRITE);
map.data[1] = ((gst_buffer_get_size (script_tag) - 11 - 4) >> 16) & 0xff;
map.data[2] = ((gst_buffer_get_size (script_tag) - 11 - 4) >> 8) & 0xff;
map.data[3] = ((gst_buffer_get_size (script_tag) - 11 - 4) >> 0) & 0xff;
GST_WRITE_UINT32_BE (map.data + 11 + 13 + 1, tags_written);
gst_buffer_unmap (script_tag, &map);
exit:
return script_tag;
}
static GstBuffer *
gst_flv_mux_buffer_to_tag_internal (GstFlvMux * mux, GstBuffer * buffer,
GstFlvMuxPad * pad, gboolean is_codec_data)
{
GstBuffer *tag;
GstMapInfo map;
guint size;
guint32 pts, dts, cts;
guint8 *data, *bdata = NULL;
gsize bsize = 0;
if (!GST_CLOCK_STIME_IS_VALID (pad->dts)) {
pts = dts = pad->last_timestamp / GST_MSECOND;
} else {
pts = pad->pts / GST_MSECOND;
dts = pad->dts / GST_MSECOND;
}
/* Be safe in case TS are buggy */
if (pts > dts)
cts = pts - dts;
else
cts = 0;
/* Timestamp must start at zero */
if (GST_CLOCK_STIME_IS_VALID (mux->first_timestamp)) {
dts -= mux->first_timestamp / GST_MSECOND;
pts = dts + cts;
}
GST_LOG_OBJECT (mux, "got pts %i dts %i cts %i", pts, dts, cts);
if (buffer != NULL) {
gst_buffer_map (buffer, &map, GST_MAP_READ);
bdata = map.data;
bsize = map.size;
}
size = 11;
if (mux->video_pad == pad) {
size += 1;
if (pad->codec == 7)
size += 4 + bsize;
else
size += bsize;
} else {
size += 1;
if (pad->codec == 10)
size += 1 + bsize;
else
size += bsize;
}
size += 4;
_gst_buffer_new_and_alloc (size, &tag, &data);
memset (data, 0, size);
data[0] = (mux->video_pad == pad) ? 9 : 8;
data[1] = ((size - 11 - 4) >> 16) & 0xff;
data[2] = ((size - 11 - 4) >> 8) & 0xff;
data[3] = ((size - 11 - 4) >> 0) & 0xff;
GST_WRITE_UINT24_BE (data + 4, dts);
data[7] = (((guint) dts) >> 24) & 0xff;
data[8] = data[9] = data[10] = 0;
if (mux->video_pad == pad) {
if (buffer && GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT))
data[11] |= 2 << 4;
else
data[11] |= 1 << 4;
data[11] |= pad->codec & 0x0f;
if (pad->codec == 7) {
if (is_codec_data) {
data[12] = 0;
GST_WRITE_UINT24_BE (data + 13, 0);
} else if (bsize == 0) {
/* AVC end of sequence */
data[12] = 2;
GST_WRITE_UINT24_BE (data + 13, 0);
} else {
/* ACV NALU */
data[12] = 1;
GST_WRITE_UINT24_BE (data + 13, cts);
}
memcpy (data + 11 + 1 + 4, bdata, bsize);
} else {
memcpy (data + 11 + 1, bdata, bsize);
}
} else {
data[11] |= (pad->codec << 4) & 0xf0;
data[11] |= (pad->rate << 2) & 0x0c;
data[11] |= (pad->width << 1) & 0x02;
data[11] |= (pad->channels << 0) & 0x01;
GST_DEBUG_OBJECT (mux, "Creating byte %02x with "
"codec:%d, rate:%d, width:%d, channels:%d",
data[11], pad->codec, pad->rate, pad->width, pad->channels);
if (pad->codec == 10) {
data[12] = is_codec_data ? 0 : 1;
memcpy (data + 11 + 1 + 1, bdata, bsize);
} else {
memcpy (data + 11 + 1, bdata, bsize);
}
}
if (buffer)
gst_buffer_unmap (buffer, &map);
GST_WRITE_UINT32_BE (data + size - 4, size - 4);
GST_BUFFER_PTS (tag) = GST_CLOCK_TIME_NONE;
GST_BUFFER_DTS (tag) = GST_CLOCK_TIME_NONE;
GST_BUFFER_DURATION (tag) = GST_CLOCK_TIME_NONE;
if (buffer) {
/* if we are streamable we copy over timestamps and offsets,
if not just copy the offsets */
if (mux->streamable) {
GstClockTime timestamp = GST_CLOCK_TIME_NONE;
if (gst_segment_to_running_time_full (&GST_AGGREGATOR_PAD (pad)->segment,
GST_FORMAT_TIME, GST_BUFFER_DTS_OR_PTS (buffer),
&timestamp) == 1) {
GST_BUFFER_PTS (tag) = timestamp;
GST_BUFFER_DURATION (tag) = GST_BUFFER_DURATION (buffer);
}
GST_BUFFER_OFFSET (tag) = GST_BUFFER_OFFSET_NONE;
GST_BUFFER_OFFSET_END (tag) = GST_BUFFER_OFFSET_NONE;
} else {
GST_BUFFER_OFFSET (tag) = GST_BUFFER_OFFSET (buffer);
GST_BUFFER_OFFSET_END (tag) = GST_BUFFER_OFFSET_END (buffer);
}
/* mark the buffer if it's an audio buffer and there's also video being muxed
* or it's a video interframe */
if (mux->video_pad == pad &&
GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT))
GST_BUFFER_FLAG_SET (tag, GST_BUFFER_FLAG_DELTA_UNIT);
} else {
GST_BUFFER_FLAG_SET (tag, GST_BUFFER_FLAG_DELTA_UNIT);
GST_BUFFER_OFFSET (tag) = GST_BUFFER_OFFSET_END (tag) =
GST_BUFFER_OFFSET_NONE;
}
return tag;
}
static inline GstBuffer *
gst_flv_mux_buffer_to_tag (GstFlvMux * mux, GstBuffer * buffer,
GstFlvMuxPad * pad)
{
return gst_flv_mux_buffer_to_tag_internal (mux, buffer, pad, FALSE);
}
static inline GstBuffer *
gst_flv_mux_codec_data_buffer_to_tag (GstFlvMux * mux, GstBuffer * buffer,
GstFlvMuxPad * pad)
{
return gst_flv_mux_buffer_to_tag_internal (mux, buffer, pad, TRUE);
}
static inline GstBuffer *
gst_flv_mux_eos_to_tag (GstFlvMux * mux, GstFlvMuxPad * pad)
{
return gst_flv_mux_buffer_to_tag_internal (mux, NULL, pad, FALSE);
}
static void
gst_flv_mux_put_buffer_in_streamheader (GValue * streamheader,
GstBuffer * buffer)
{
GValue value = { 0 };
GstBuffer *buf;
g_value_init (&value, GST_TYPE_BUFFER);
buf = gst_buffer_copy (buffer);
gst_value_set_buffer (&value, buf);
gst_buffer_unref (buf);
gst_value_array_append_value (streamheader, &value);
g_value_unset (&value);
}
static GstCaps *
gst_flv_mux_prepare_src_caps (GstFlvMux * mux, GstBuffer ** header_buf,
GstBuffer ** metadata_buf, GstBuffer ** video_codec_data_buf,
GstBuffer ** audio_codec_data_buf)
{
GstBuffer *header, *metadata;
GstBuffer *video_codec_data, *audio_codec_data;
GstCaps *caps;
GstStructure *structure;
GValue streamheader = { 0 };
GList *l;
header = gst_flv_mux_create_header (mux);
metadata = gst_flv_mux_create_metadata (mux, TRUE);
video_codec_data = NULL;
audio_codec_data = NULL;
for (l = GST_ELEMENT_CAST (mux)->sinkpads; l != NULL; l = l->next) {
GstFlvMuxPad *pad = l->data;
/* Get H.264 and AAC codec data, if present */
if (pad && mux->video_pad == pad && pad->codec == 7) {
if (pad->codec_data == NULL)
GST_WARNING_OBJECT (mux, "Codec data for video stream not found, "
"output might not be playable");
else
video_codec_data =
gst_flv_mux_codec_data_buffer_to_tag (mux, pad->codec_data, pad);
} else if (pad && mux->audio_pad == pad && pad->codec == 10) {
if (pad->codec_data == NULL)
GST_WARNING_OBJECT (mux, "Codec data for audio stream not found, "
"output might not be playable");
else
audio_codec_data =
gst_flv_mux_codec_data_buffer_to_tag (mux, pad->codec_data, pad);
}
}
/* mark buffers that will go in the streamheader */
GST_BUFFER_FLAG_SET (header, GST_BUFFER_FLAG_HEADER);
GST_BUFFER_FLAG_SET (metadata, GST_BUFFER_FLAG_HEADER);
if (video_codec_data != NULL) {
GST_BUFFER_FLAG_SET (video_codec_data, GST_BUFFER_FLAG_HEADER);
/* mark as a delta unit, so downstream will not try to synchronize on that
* buffer - to actually start playback you need a real video keyframe */
GST_BUFFER_FLAG_SET (video_codec_data, GST_BUFFER_FLAG_DELTA_UNIT);
}
if (audio_codec_data != NULL) {
GST_BUFFER_FLAG_SET (audio_codec_data, GST_BUFFER_FLAG_HEADER);
}
/* put buffers in streamheader */
g_value_init (&streamheader, GST_TYPE_ARRAY);
gst_flv_mux_put_buffer_in_streamheader (&streamheader, header);
gst_flv_mux_put_buffer_in_streamheader (&streamheader, metadata);
if (video_codec_data != NULL)
gst_flv_mux_put_buffer_in_streamheader (&streamheader, video_codec_data);
if (audio_codec_data != NULL)
gst_flv_mux_put_buffer_in_streamheader (&streamheader, audio_codec_data);
/* create the caps and put the streamheader in them */
caps = gst_caps_new_empty_simple ("video/x-flv");
structure = gst_caps_get_structure (caps, 0);
gst_structure_set_value (structure, "streamheader", &streamheader);
g_value_unset (&streamheader);
if (header_buf) {
*header_buf = header;
} else {
gst_buffer_unref (header);
}
if (metadata_buf) {
*metadata_buf = metadata;
} else {
gst_buffer_unref (metadata);
}
if (video_codec_data_buf) {
*video_codec_data_buf = video_codec_data;
} else if (video_codec_data) {
gst_buffer_unref (video_codec_data);
}
if (audio_codec_data_buf) {
*audio_codec_data_buf = audio_codec_data;
} else if (audio_codec_data) {
gst_buffer_unref (audio_codec_data);
}
return caps;
}
static GstFlowReturn
gst_flv_mux_write_header (GstFlvMux * mux)
{
GstBuffer *header, *metadata;
GstBuffer *video_codec_data, *audio_codec_data;
GstCaps *caps;
GstFlowReturn ret;
header = metadata = video_codec_data = audio_codec_data = NULL;
/* if not streaming, check if downstream is seekable */
if (!mux->streamable) {
gboolean seekable;
GstQuery *query;
query = gst_query_new_seeking (GST_FORMAT_BYTES);
if (gst_pad_peer_query (mux->srcpad, query)) {
gst_query_parse_seeking (query, NULL, &seekable, NULL, NULL);
GST_INFO_OBJECT (mux, "downstream is %sseekable", seekable ? "" : "not ");
} else {
/* have to assume seeking is supported if query not handled downstream */
GST_WARNING_OBJECT (mux, "downstream did not handle seeking query");
seekable = FALSE;
}
if (!seekable) {
mux->streamable = TRUE;
g_object_notify (G_OBJECT (mux), "streamable");
GST_WARNING_OBJECT (mux, "downstream is not seekable, but "
"streamable=false. Will ignore that and create streamable output "
"instead");
}
gst_query_unref (query);
}
caps = gst_flv_mux_prepare_src_caps (mux,
&header, &metadata, &video_codec_data, &audio_codec_data);
gst_aggregator_set_src_caps (GST_AGGREGATOR_CAST (mux), caps);
gst_caps_unref (caps);
/* push the header buffer, the metadata and the codec info, if any */
ret = gst_flv_mux_push (mux, header);
if (ret != GST_FLOW_OK)
goto failure_header;
ret = gst_flv_mux_push (mux, metadata);
if (ret != GST_FLOW_OK)
goto failure_metadata;
if (video_codec_data != NULL) {
ret = gst_flv_mux_push (mux, video_codec_data);
if (ret != GST_FLOW_OK)
goto failure_video_codec_data;
}
if (audio_codec_data != NULL) {
ret = gst_flv_mux_push (mux, audio_codec_data);
if (ret != GST_FLOW_OK)
goto failure_audio_codec_data;
}
return GST_FLOW_OK;
failure_header:
gst_buffer_unref (metadata);
failure_metadata:
if (video_codec_data != NULL)
gst_buffer_unref (video_codec_data);
failure_video_codec_data:
if (audio_codec_data != NULL)
gst_buffer_unref (audio_codec_data);
failure_audio_codec_data:
return ret;
}
static GstClockTime
gst_flv_mux_segment_to_running_time (const GstSegment * segment, GstClockTime t)
{
/* we can get a dts before the segment, if dts < pts and pts is inside
* the segment, so we consider early times as 0 */
if (t < segment->start)
return 0;
return gst_segment_to_running_time (segment, GST_FORMAT_TIME, t);
}
static void
gst_flv_mux_update_index (GstFlvMux * mux, GstBuffer * buffer,
GstFlvMuxPad * pad)
{
/*
* Add the tag byte offset and to the index if it's a valid seek point, which
* means it's either a video keyframe or if there is no video pad (in that
* case every FLV tag is a valid seek point)
*/
if (mux->video_pad == pad &&
GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT))
return;
if (GST_BUFFER_PTS_IS_VALID (buffer)) {
GstFlvMuxIndexEntry *entry = g_slice_new (GstFlvMuxIndexEntry);
GstClockTime pts =
gst_flv_mux_segment_to_running_time (&GST_AGGREGATOR_PAD
(pad)->segment, GST_BUFFER_PTS (buffer));
entry->position = mux->byte_count;
entry->time = gst_guint64_to_gdouble (pts) / GST_SECOND;
mux->index = g_list_prepend (mux->index, entry);
}
}
static GstFlowReturn
gst_flv_mux_write_buffer (GstFlvMux * mux, GstFlvMuxPad * pad,
GstBuffer * buffer)
{
GstBuffer *tag;
GstFlowReturn ret;
GstClockTime dts =
gst_flv_mux_segment_to_running_time (&GST_AGGREGATOR_PAD (pad)->segment,
GST_BUFFER_DTS (buffer));
/* clipping function arranged for running_time */
if (!mux->streamable)
gst_flv_mux_update_index (mux, buffer, pad);
tag = gst_flv_mux_buffer_to_tag (mux, buffer, pad);
gst_buffer_unref (buffer);
ret = gst_flv_mux_push (mux, tag);
if (ret == GST_FLOW_OK && GST_CLOCK_TIME_IS_VALID (dts))
pad->last_timestamp = dts;
return ret;
}
static guint64
gst_flv_mux_determine_duration (GstFlvMux * mux)
{
GList *l;
GstClockTime duration = GST_CLOCK_TIME_NONE;
GST_DEBUG_OBJECT (mux, "trying to determine the duration "
"from pad timestamps");
for (l = GST_ELEMENT_CAST (mux)->sinkpads; l != NULL; l = l->next) {
GstFlvMuxPad *pad = GST_FLV_MUX_PAD (l->data);
if (pad && (pad->last_timestamp != GST_CLOCK_TIME_NONE)) {
if (duration == GST_CLOCK_TIME_NONE)
duration = pad->last_timestamp;
else
duration = MAX (duration, pad->last_timestamp);
}
}
return duration;
}
static gboolean
gst_flv_mux_are_all_pads_eos (GstFlvMux * mux)
{
GList *l;
for (l = GST_ELEMENT_CAST (mux)->sinkpads; l; l = l->next) {
GstFlvMuxPad *pad = GST_FLV_MUX_PAD (l->data);
if (!gst_aggregator_pad_is_eos (GST_AGGREGATOR_PAD (pad)))
return FALSE;
}
return TRUE;
}
static GstFlowReturn
gst_flv_mux_write_eos (GstFlvMux * mux)
{
GstBuffer *tag;
if (mux->video_pad == NULL)
return GST_FLOW_OK;
tag = gst_flv_mux_eos_to_tag (mux, mux->video_pad);
return gst_flv_mux_push (mux, tag);
}
static GstFlowReturn
gst_flv_mux_rewrite_header (GstFlvMux * mux)
{
GstBuffer *rewrite, *index, *tmp;
GstEvent *event;
guint8 *data;
gdouble d;
GList *l;
guint32 index_len, allocate_size;
guint32 i, index_skip;
GstSegment segment;
GstClockTime dur;
if (mux->streamable)
return GST_FLOW_OK;
/* seek back to the preallocated index space */
gst_segment_init (&segment, GST_FORMAT_BYTES);
segment.start = segment.time = 13 + 29;
event = gst_event_new_segment (&segment);
if (!gst_pad_push_event (mux->srcpad, event)) {
GST_WARNING_OBJECT (mux, "Seek to rewrite header failed");
return GST_FLOW_OK;
}
/* determine duration now based on our own timestamping,
* so that it is likely many times better and consistent
* than whatever obtained by some query */
dur = gst_flv_mux_determine_duration (mux);
if (dur != GST_CLOCK_TIME_NONE)
mux->duration = dur;
/* rewrite the duration tag */
d = gst_guint64_to_gdouble (mux->duration);
d /= (gdouble) GST_SECOND;
GST_DEBUG_OBJECT (mux, "determined the final duration to be %f", d);
rewrite = gst_flv_mux_create_number_script_value ("duration", d);
/* rewrite the filesize tag */
d = gst_guint64_to_gdouble (mux->byte_count);
GST_DEBUG_OBJECT (mux, "putting total filesize %f in the metadata", d);
tmp = gst_flv_mux_create_number_script_value ("filesize", d);
rewrite = gst_buffer_append (rewrite, tmp);
if (!mux->index) {
/* no index, so push buffer and return */
return gst_flv_mux_push (mux, rewrite);
}
/* rewrite the index */
mux->index = g_list_reverse (mux->index);
index_len = g_list_length (mux->index);
/* We write at most MAX_INDEX_ENTRIES elements */
if (index_len > MAX_INDEX_ENTRIES) {
index_skip = 1 + index_len / MAX_INDEX_ENTRIES;
index_len = (index_len + index_skip - 1) / index_skip;
} else {
index_skip = 1;
}
GST_DEBUG_OBJECT (mux, "Index length is %d", index_len);
/* see size calculation in gst_flv_mux_preallocate_index */
allocate_size = 11 + 8 + 22 + 10 + index_len * 18;
GST_DEBUG_OBJECT (mux, "Allocating %d bytes for index", allocate_size);
_gst_buffer_new_and_alloc (allocate_size, &index, &data);
GST_WRITE_UINT16_BE (data, 9); /* the 'keyframes' key */
memcpy (data + 2, "keyframes", 9);
GST_WRITE_UINT8 (data + 11, 8); /* nested ECMA array */
GST_WRITE_UINT32_BE (data + 12, 2); /* two elements */
GST_WRITE_UINT16_BE (data + 16, 5); /* first string key: 'times' */
memcpy (data + 18, "times", 5);
GST_WRITE_UINT8 (data + 23, 10); /* strict array */
GST_WRITE_UINT32_BE (data + 24, index_len);
data += 28;
/* the keyframes' times */
for (i = 0, l = mux->index; l; l = l->next, i++) {
GstFlvMuxIndexEntry *entry = l->data;
if (i % index_skip != 0)
continue;
GST_WRITE_UINT8 (data, 0); /* numeric (aka double) */
GST_WRITE_DOUBLE_BE (data + 1, entry->time);
data += 9;
}
GST_WRITE_UINT16_BE (data, 13); /* second string key: 'filepositions' */
memcpy (data + 2, "filepositions", 13);
GST_WRITE_UINT8 (data + 15, 10); /* strict array */
GST_WRITE_UINT32_BE (data + 16, index_len);
data += 20;
/* the keyframes' file positions */
for (i = 0, l = mux->index; l; l = l->next, i++) {
GstFlvMuxIndexEntry *entry = l->data;
if (i % index_skip != 0)
continue;
GST_WRITE_UINT8 (data, 0);
GST_WRITE_DOUBLE_BE (data + 1, entry->position);
data += 9;
}
GST_WRITE_UINT24_BE (data, 9); /* finish the ECMA array */
/* If there is space left in the prefilled area, reinsert the filler.
There is at least 18 bytes free, so it will always fit. */
if (index_len < MAX_INDEX_ENTRIES) {
GstBuffer *tmp;
guint8 *data;
guint32 remaining_filler_size;
_gst_buffer_new_and_alloc (14, &tmp, &data);
GST_WRITE_UINT16_BE (data, 9);
memcpy (data + 2, "gstfiller", 9);
GST_WRITE_UINT8 (data + 11, 2); /* string */
/* There is 18 bytes per remaining index entry minus what is used for
* the'gstfiller' key. The rest is already filled with spaces, so just need
* to update length. */
remaining_filler_size = (MAX_INDEX_ENTRIES - index_len) * 18 - 14;
GST_DEBUG_OBJECT (mux, "Remaining filler size is %d bytes",
remaining_filler_size);
GST_WRITE_UINT16_BE (data + 12, remaining_filler_size);
index = gst_buffer_append (index, tmp);
}
rewrite = gst_buffer_append (rewrite, index);
return gst_flv_mux_push (mux, rewrite);
}
static GstFlvMuxPad *
gst_flv_mux_find_best_pad (GstAggregator * aggregator, GstClockTime * ts)
{
GstAggregatorPad *apad;
GstFlvMuxPad *pad, *best = NULL;
GList *l;
GstBuffer *buffer;
GstClockTime best_ts = GST_CLOCK_TIME_NONE;
for (l = GST_ELEMENT_CAST (aggregator)->sinkpads; l; l = l->next) {
apad = GST_AGGREGATOR_PAD (l->data);
pad = GST_FLV_MUX_PAD (l->data);
buffer = gst_aggregator_pad_peek_buffer (GST_AGGREGATOR_PAD (pad));
if (!buffer)
continue;
if (best_ts == GST_CLOCK_TIME_NONE) {
best = pad;
best_ts = gst_flv_mux_segment_to_running_time (&apad->segment,
GST_BUFFER_DTS_OR_PTS (buffer));
} else if (GST_BUFFER_DTS_OR_PTS (buffer) != GST_CLOCK_TIME_NONE) {
gint64 t = gst_flv_mux_segment_to_running_time (&apad->segment,
GST_BUFFER_DTS_OR_PTS (buffer));
if (t < best_ts) {
best = pad;
best_ts = t;
}
}
gst_buffer_unref (buffer);
}
GST_DEBUG_OBJECT (aggregator,
"Best pad found with %" GST_TIME_FORMAT ": %" GST_PTR_FORMAT,
GST_TIME_ARGS (best_ts), best);
if (ts)
*ts = best_ts;
return best;
}
static GstFlowReturn
gst_flv_mux_aggregate (GstAggregator * aggregator, gboolean timeout)
{
GstFlvMux *mux = GST_FLV_MUX (aggregator);
GstFlvMuxPad *best;
gint64 best_time = GST_CLOCK_STIME_NONE;
GstFlowReturn ret;
GstClockTime ts;
GstBuffer *buffer = NULL;
if (mux->state == GST_FLV_MUX_STATE_HEADER) {
if (GST_ELEMENT_CAST (mux)->sinkpads == NULL) {
GST_ELEMENT_ERROR (mux, STREAM, MUX, (NULL),
("No input streams configured"));
return GST_FLOW_ERROR;
}
ret = gst_flv_mux_write_header (mux);
if (ret != GST_FLOW_OK)
return ret;
mux->state = GST_FLV_MUX_STATE_DATA;
best = gst_flv_mux_find_best_pad (aggregator, &ts);
if (best && GST_CLOCK_STIME_IS_VALID (ts))
mux->first_timestamp = ts;
else
mux->first_timestamp = 0;
} else {
best = gst_flv_mux_find_best_pad (aggregator, &ts);
}
if (mux->new_tags) {
GstBuffer *buf = gst_flv_mux_create_metadata (mux, FALSE);
if (buf)
gst_flv_mux_push (mux, buf);
mux->new_tags = FALSE;
}
if (best) {
buffer = gst_aggregator_pad_pop_buffer (GST_AGGREGATOR_PAD (best));
g_assert (buffer);
best->dts =
gst_flv_mux_segment_to_running_time (&GST_AGGREGATOR_PAD
(best)->segment, GST_BUFFER_DTS_OR_PTS (buffer));
if (GST_CLOCK_STIME_IS_VALID (best->dts))
best_time = best->dts - mux->first_timestamp;
if (GST_BUFFER_PTS_IS_VALID (buffer))
best->pts =
gst_flv_mux_segment_to_running_time (&GST_AGGREGATOR_PAD
(best)->segment, GST_BUFFER_PTS (buffer));
else
best->pts = best->dts;
GST_LOG_OBJECT (best, "got buffer PTS %" GST_TIME_FORMAT " DTS %"
GST_STIME_FORMAT, GST_TIME_ARGS (best->pts),
GST_STIME_ARGS (best->dts));
} else {
best_time = GST_CLOCK_STIME_NONE;
}
/* The FLV timestamp is an int32 field. For non-live streams error out if a
bigger timestamp is seen, for live the timestamp will get wrapped in
gst_flv_mux_buffer_to_tag */
if (!mux->streamable && (GST_CLOCK_STIME_IS_VALID (best_time))
&& best_time / GST_MSECOND > G_MAXINT32) {
GST_WARNING_OBJECT (mux, "Timestamp larger than FLV supports - EOS");
if (buffer) {
gst_buffer_unref (buffer);
buffer = NULL;
}
best = NULL;
}
if (best) {
return gst_flv_mux_write_buffer (mux, best, buffer);
} else {
if (gst_flv_mux_are_all_pads_eos (mux)) {
gst_flv_mux_write_eos (mux);
gst_flv_mux_rewrite_header (mux);
return GST_FLOW_EOS;
}
return GST_FLOW_OK;
}
}
static void
gst_flv_mux_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstFlvMux *mux = GST_FLV_MUX (object);
switch (prop_id) {
case PROP_STREAMABLE:
g_value_set_boolean (value, mux->streamable);
break;
case PROP_METADATACREATOR:
g_value_set_string (value, mux->metadatacreator);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_flv_mux_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstFlvMux *mux = GST_FLV_MUX (object);
switch (prop_id) {
case PROP_STREAMABLE:
mux->streamable = g_value_get_boolean (value);
if (mux->streamable)
gst_tag_setter_set_tag_merge_mode (GST_TAG_SETTER (mux),
GST_TAG_MERGE_REPLACE);
else
gst_tag_setter_set_tag_merge_mode (GST_TAG_SETTER (mux),
GST_TAG_MERGE_KEEP);
break;
case PROP_METADATACREATOR:
g_free (mux->metadatacreator);
if (!g_value_get_string (value)) {
GST_WARNING_OBJECT (mux, "metadatacreator property can not be NULL");
mux->metadatacreator = g_strdup (DEFAULT_METADATACREATOR);
} else {
mux->metadatacreator = g_value_dup_string (value);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstClockTime
gst_flv_mux_get_next_time (GstAggregator * aggregator)
{
GstFlvMux *mux = GST_FLV_MUX (aggregator);
GstAggregatorPad *agg_audio_pad = GST_AGGREGATOR_PAD_CAST (mux->audio_pad);
GstAggregatorPad *agg_video_pad = GST_AGGREGATOR_PAD_CAST (mux->video_pad);
GST_OBJECT_LOCK (aggregator);
if (mux->state == GST_FLV_MUX_STATE_HEADER &&
((mux->audio_pad && mux->audio_pad->codec == G_MAXUINT) ||
(mux->video_pad && mux->video_pad->codec == G_MAXUINT)))
goto wait_for_data;
if (!((agg_audio_pad && gst_aggregator_pad_has_buffer (agg_audio_pad)) ||
(agg_video_pad && gst_aggregator_pad_has_buffer (agg_video_pad))))
goto wait_for_data;
GST_OBJECT_UNLOCK (aggregator);
return gst_aggregator_simple_get_next_time (aggregator);
wait_for_data:
GST_OBJECT_UNLOCK (aggregator);
return GST_CLOCK_TIME_NONE;
}
static GstFlowReturn
gst_flv_mux_update_src_caps (GstAggregator * aggregator,
GstCaps * caps, GstCaps ** ret)
{
GstFlvMux *mux = GST_FLV_MUX (aggregator);
*ret = gst_flv_mux_prepare_src_caps (mux, NULL, NULL, NULL, NULL);
return GST_FLOW_OK;
}
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