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gstreamer/gst/flv/gstflvmux.c
Yeongjin Jeong 8cae95a22d flvmux: Don't refuse caps changes after starting to write headers in streamable mode. 
Flv does support changing the stream type and stream properties
after the headers were started to be written, and for example H264
codec_data changes can be supported.

https://bugzilla.gnome.org/show_bug.cgi?id=797256
2018-10-11 15:35:24 -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;
mux->sent_header = FALSE;
/* 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;
guint old_codec;
GstBuffer *old_codec_data = NULL;
old_codec = pad->codec;
if (pad->codec_data)
old_codec_data = gst_buffer_ref (pad->codec_data);
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)
gst_buffer_replace (&pad->codec_data, gst_value_get_buffer (val));
else if (!val && pad->codec_data)
gst_buffer_unref (pad->codec_data);
}
if (ret && mux->streamable && mux->state != GST_FLV_MUX_STATE_HEADER) {
if (old_codec != pad->codec) {
pad->info_changed = TRUE;
}
if (old_codec_data && pad->codec_data) {
GstMapInfo map;
gst_buffer_map (old_codec_data, &map, GST_MAP_READ);
if (map.size != gst_buffer_get_size (pad->codec_data) ||
gst_buffer_memcmp (pad->codec_data, 0, map.data, map.size))
pad->info_changed = TRUE;
gst_buffer_unmap (old_codec_data, &map);
} else if (!old_codec_data && pad->codec_data) {
pad->info_changed = TRUE;
}
if (pad->info_changed)
mux->state = GST_FLV_MUX_STATE_HEADER;
}
if (old_codec_data)
gst_buffer_unref (old_codec_data);
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;
guint old_codec, old_rate, old_width, old_channels;
GstBuffer *old_codec_data = NULL;
old_codec = pad->codec;
old_rate = pad->rate;
old_width = pad->width;
old_channels = pad->channels;
if (pad->codec_data)
old_codec_data = gst_buffer_ref (pad->codec_data);
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)
gst_buffer_replace (&pad->codec_data, gst_value_get_buffer (val));
else if (!val && pad->codec_data)
gst_buffer_unref (pad->codec_data);
}
if (ret && mux->streamable && mux->state != GST_FLV_MUX_STATE_HEADER) {
if (old_codec != pad->codec || old_rate != pad->rate ||
old_width != pad->width || old_channels != pad->channels) {
pad->info_changed = TRUE;
}
if (old_codec_data && pad->codec_data) {
GstMapInfo map;
gst_buffer_map (old_codec_data, &map, GST_MAP_READ);
if (map.size != gst_buffer_get_size (pad->codec_data) ||
gst_buffer_memcmp (pad->codec_data, 0, map.data, map.size))
pad->info_changed = TRUE;
gst_buffer_unmap (old_codec_data, &map);
} else if (!old_codec_data && pad->codec_data) {
pad->info_changed = TRUE;
}
if (pad->info_changed)
mux->state = GST_FLV_MUX_STATE_HEADER;
}
if (old_codec_data)
gst_buffer_unref (old_codec_data);
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;
pad->info_changed = FALSE;
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);
}
if (!mux->streamable) {
caps = gst_flv_mux_prepare_src_caps (mux,
&header, &metadata, &video_codec_data, &audio_codec_data);
} else {
if (!mux->sent_header) {
caps = gst_flv_mux_prepare_src_caps (mux,
&header, &metadata, &video_codec_data, &audio_codec_data);
} else {
caps = gst_flv_mux_prepare_src_caps (mux,
NULL, NULL,
(mux->video_pad->info_changed ? &video_codec_data : NULL),
(mux->audio_pad->info_changed ? &audio_codec_data : NULL));
}
}
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 */
if (header != NULL) {
ret = gst_flv_mux_push (mux, header);
if (ret != GST_FLOW_OK)
goto failure_header;
mux->sent_header = TRUE;
}
if (metadata != NULL) {
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;
mux->video_pad->info_changed = FALSE;
}
if (audio_codec_data != NULL) {
ret = gst_flv_mux_push (mux, audio_codec_data);
if (ret != GST_FLOW_OK)
goto failure_audio_codec_data;
mux->audio_pad->info_changed = FALSE;
}
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 (!mux->streamable || mux->first_timestamp == GST_CLOCK_STIME_NONE) {
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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