mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-11-08 10:31:05 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/gst/matroska/matroska-mux.c
David Schleef ce51f6173c Merge CAPS branch 
Original commit message from CVS:
Merge CAPS branch
2003-12-22 01:47:09 +00:00

995 lines
31 KiB
C
Raw Blame History

/* GStreamer Matroska muxer/demuxer
* (c) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* matroska-mux.c: matroska file/stream muxer
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <string.h>
#include "matroska-mux.h"
#include "matroska-ids.h"
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_METADATA,
/* FILL ME */
};
static GstStaticPadTemplate src_templ =
GST_STATIC_PAD_TEMPLATE (
"src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-matroska")
);
#define COMMON_VIDEO_CAPS \
"width = (int) [ 16, 4096 ], " \
"height = (int) [ 16, 4096 ], " \
"framerate = (double) [ 0, MAX ]"
static GstStaticPadTemplate videosink_templ =
GST_STATIC_PAD_TEMPLATE (
"video_%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS (
"video/mpeg, "
"mpegversion = (int) { 1, 2, 4 }, "
"systemstream = (boolean) false, "
COMMON_VIDEO_CAPS "; "
"video/x-divx, "
COMMON_VIDEO_CAPS "; "
"video/x-xvid, "
COMMON_VIDEO_CAPS "; "
"video/x-msmpeg, "
COMMON_VIDEO_CAPS "; "
"video/x-jpeg, "
COMMON_VIDEO_CAPS "; "
"video/x-raw-yuv, "
"format = (fourcc) { YUY2, I420 }, "
COMMON_VIDEO_CAPS
)
);
#define COMMON_AUDIO_CAPS \
"channels = (int) [ 1, 8 ], " \
"rate = (int) [ 8000, 96000 ]"
/* FIXME:
* * audio/x-raw-float: endianness needs defining.
* * audio/x-vorbis: private data setup needs work.
*/
static GstStaticPadTemplate audiosink_templ =
GST_STATIC_PAD_TEMPLATE (
"audio_%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS (
"audio/mpeg, "
"mpegversion = (int) 1, "
"layer = (int) [ 1, 3 ], "
COMMON_AUDIO_CAPS "; "
"audio/mpeg, "
"mpegversion = (int) { 2, 4 }, "
COMMON_AUDIO_CAPS "; "
"audio/x-ac3, "
COMMON_AUDIO_CAPS "; "
"audio/x-raw-int, "
"width = (int) { 8, 16, 24 }, "
"depth = (int) { 8, 16, 24 }, "
"endianness = (int) { BIG_ENDIAN, LITTLE_ENDIAN }, "
"signed = (boolean) { true, false }, "
COMMON_AUDIO_CAPS
)
);
static GstStaticPadTemplate subtitlesink_templ =
GST_STATIC_PAD_TEMPLATE (
"subtitle_%d",
GST_PAD_SINK,
GST_PAD_REQUEST,
GST_STATIC_CAPS_ANY
);
/* gobject magic foo */
static void gst_matroska_mux_base_init (GstMatroskaMuxClass *klass);
static void gst_matroska_mux_class_init (GstMatroskaMuxClass *klass);
static void gst_matroska_mux_init (GstMatroskaMux *mux);
/* element functions */
static void gst_matroska_mux_loop (GstElement *element);
/* pad functions */
static GstPad * gst_matroska_mux_request_new_pad (GstElement *element,
GstPadTemplate *templ,
const gchar *name);
/* gst internal change state handler */
static GstElementStateReturn
gst_matroska_mux_change_state (GstElement *element);
/* gobject bla bla */
static void gst_matroska_mux_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gst_matroska_mux_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
/* reset muxer */
static void gst_matroska_mux_reset (GstElement *element);
static GstEbmlWriteClass *parent_class = NULL;
/*static guint gst_matroska_mux_signals[LAST_SIGNAL] = { 0 };*/
GType
gst_matroska_mux_get_type (void)
{
static GType gst_matroska_mux_type = 0;
if (!gst_matroska_mux_type) {
static const GTypeInfo gst_matroska_mux_info = {
sizeof (GstMatroskaMuxClass),
(GBaseInitFunc) gst_matroska_mux_base_init,
NULL,
(GClassInitFunc) gst_matroska_mux_class_init,
NULL,
NULL,
sizeof (GstMatroskaMux),
0,
(GInstanceInitFunc) gst_matroska_mux_init,
};
gst_matroska_mux_type =
g_type_register_static (GST_TYPE_EBML_WRITE,
"GstMatroskaMmux",
&gst_matroska_mux_info, 0);
}
return gst_matroska_mux_type;
}
static void
gst_matroska_mux_base_init (GstMatroskaMuxClass *klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
static GstElementDetails gst_matroska_mux_details = {
"Matroska muxer",
"Codec/Muxer",
"Muxes video/audio/subtitle streams into a matroska stream",
"Ronald Bultje <rbultje@ronald.bitfreak.net>"
};
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&videosink_templ));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&audiosink_templ));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&subtitlesink_templ));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_templ));
gst_element_class_set_details (element_class,
&gst_matroska_mux_details);
}
static void
gst_matroska_mux_class_init (GstMatroskaMuxClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
g_object_class_install_property (gobject_class, ARG_METADATA,
g_param_spec_boxed ("metadata", "Metadata", "Metadata",
GST_TYPE_CAPS, G_PARAM_READWRITE));
parent_class = g_type_class_ref (GST_TYPE_EBML_WRITE);
gobject_class->get_property = gst_matroska_mux_get_property;
gobject_class->set_property = gst_matroska_mux_set_property;
gstelement_class->change_state = gst_matroska_mux_change_state;
gstelement_class->request_new_pad = gst_matroska_mux_request_new_pad;
}
static void
gst_matroska_mux_init (GstMatroskaMux *mux)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (mux);
gint i;
mux->srcpad = gst_pad_new_from_template (
gst_element_class_get_pad_template (klass, "src"), "src");
gst_element_add_pad (GST_ELEMENT (mux), mux->srcpad);
GST_EBML_WRITE (mux)->srcpad = mux->srcpad;
gst_element_set_loop_function (GST_ELEMENT (mux),
gst_matroska_mux_loop);
/* initial stream no. */
for (i = 0; i < GST_MATROSKA_MUX_MAX_STREAMS; i++) {
mux->sink[i].buffer = NULL;
mux->sink[i].track = NULL;
}
mux->index = NULL;
/* finish off */
gst_matroska_mux_reset (GST_ELEMENT (mux));
}
static void
gst_matroska_mux_reset (GstElement *element)
{
GstMatroskaMux *mux = GST_MATROSKA_MUX (element);
guint i;
/* reset input */
mux->state = GST_MATROSKA_MUX_STATE_START;
/* clean up existing streams */
for (i = 0; i < GST_MATROSKA_MUX_MAX_STREAMS; i++) {
if (mux->sink[i].track != NULL) {
if (mux->sink[i].track->pad != NULL) {
gst_element_remove_pad (GST_ELEMENT (mux), mux->sink[i].track->pad);
}
g_free (mux->sink[i].track->codec_id);
g_free (mux->sink[i].track->codec_name);
g_free (mux->sink[i].track->name);
g_free (mux->sink[i].track->language);
g_free (mux->sink[i].track->codec_priv);
g_free (mux->sink[i].track);
mux->sink[i].track = NULL;
}
if (mux->sink[i].buffer != NULL) {
gst_buffer_unref (mux->sink[i].buffer);
mux->sink[i].buffer = NULL;
}
mux->sink[i].eos = FALSE;
}
mux->num_streams = 0;
mux->num_a_streams = 0;
mux->num_t_streams = 0;
mux->num_v_streams = 0;
/* reset media info (to default) */
gst_caps_replace (&mux->metadata,
gst_caps_new_simple ("application/x-gst-metadata",
"application", G_TYPE_STRING, "",
"date", G_TYPE_STRING, "", NULL));
/* reset indexes */
mux->num_indexes = 0;
g_free (mux->index);
mux->index = NULL;
/* reset timers */
mux->time_scale = 1000000;
mux->duration = 0;
}
static GstPadLinkReturn
gst_matroska_mux_video_pad_link (GstPad *pad, const GstCaps *caps)
{
GstMatroskaTrackContext *context = NULL;
GstMatroskaTrackVideoContext *videocontext;
GstMatroskaMux *mux = GST_MATROSKA_MUX (gst_pad_get_parent (pad));
const gchar *mimetype;
gint width, height, pixel_width, pixel_height, i;
gdouble framerate;
GstStructure *structure;
gboolean ret;
/* find context */
for (i = 0; i < mux->num_streams; i++) {
if (mux->sink[i].track && mux->sink[i].track->pad &&
mux->sink[i].track->pad == pad) {
context = mux->sink[i].track;
break;
}
}
g_assert (i < mux->num_streams);
g_assert (context->type == GST_MATROSKA_TRACK_TYPE_VIDEO);
videocontext = (GstMatroskaTrackVideoContext *) context;
/* gst -> matroska ID'ing */
structure = gst_caps_get_structure (caps, 0);
mimetype = gst_structure_get_name (structure);
/* get general properties */
gst_structure_get_int (structure, "width", &width);
gst_structure_get_int (structure, "height", &height);
gst_structure_get_double (structure, "framerate", &framerate);
videocontext->pixel_width = width;
videocontext->pixel_height = height;
context->default_duration = GST_SECOND / framerate;
ret = gst_structure_get_int (structure, "pixel_width", &pixel_width);
ret &= gst_structure_get_int (structure, "pixel_height", &pixel_height);
if (ret) {
if (pixel_width > pixel_height) {
videocontext->display_width = width * pixel_width / pixel_height;
videocontext->display_height = height;
} else if (pixel_width < pixel_height) {
videocontext->display_width = width;
videocontext->display_height = height * pixel_height / pixel_width;
} else {
videocontext->display_width = 0;
videocontext->display_height = 0;
}
} else {
videocontext->display_width = 0;
videocontext->display_height = 0;
}
videocontext->asr_mode = GST_MATROSKA_ASPECT_RATIO_MODE_FREE;
videocontext->eye_mode = GST_MATROSKA_EYE_MODE_MONO;
videocontext->fourcc = 0;
/* find type */
if (!strcmp (mimetype, "video/x-raw-yuv")) {
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_VIDEO_UNCOMPRESSED);
gst_structure_get_fourcc (structure, "format", &videocontext->fourcc);
return GST_PAD_LINK_OK;
} else if (!strcmp (mimetype, "video/x-jpeg")) {
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_VIDEO_MJPEG);
return GST_PAD_LINK_OK;
} else if (!strcmp (mimetype, "video/x-divx")) {
gint divxversion;
gst_structure_get_int (structure, "divxversion", &divxversion);
switch (divxversion) {
case 3:
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_VIDEO_MSMPEG4V3);
break;
case 4:
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_VIDEO_MPEG4_SP);
break;
case 5:
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_VIDEO_MPEG4_ASP);
break;
}
return GST_PAD_LINK_OK;
} else if (!strcmp (mimetype, "video/x-xvid")) {
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_VIDEO_MPEG4_ASP);
return GST_PAD_LINK_OK;
} else if (!strcmp (mimetype, "video/mpeg")) {
gint mpegversion;
gst_structure_get_int (structure, "mpegversion", &mpegversion);
switch (mpegversion) {
case 1:
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_VIDEO_MPEG1);
break;
case 2:
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_VIDEO_MPEG2);
break;
case 3:
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_VIDEO_MPEG4_ASP);
break;
}
return GST_PAD_LINK_OK;
} else if (!strcmp (mimetype, "video/x-msmpeg")) {
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_VIDEO_MSMPEG4V3);
return GST_PAD_LINK_OK;
}
return GST_PAD_LINK_REFUSED;
}
static GstPadLinkReturn
gst_matroska_mux_audio_pad_link (GstPad *pad,
const GstCaps *caps)
{
GstMatroskaTrackContext *context = NULL;
GstMatroskaTrackAudioContext *audiocontext;
GstMatroskaMux *mux = GST_MATROSKA_MUX (gst_pad_get_parent (pad));
const gchar *mimetype;
gint samplerate, channels, i;
GstStructure *structure;
/* find context */
for (i = 0; i < mux->num_streams; i++) {
if (mux->sink[i].track && mux->sink[i].track->pad &&
mux->sink[i].track->pad == pad) {
context = mux->sink[i].track;
break;
}
}
g_assert (i < mux->num_streams);
g_assert (context->type == GST_MATROSKA_TRACK_TYPE_AUDIO);
audiocontext = (GstMatroskaTrackAudioContext *) context;
structure = gst_caps_get_structure (caps, 0);
mimetype = gst_structure_get_name (structure);
/* general setup */
gst_structure_get_int (structure, "rate", &samplerate);
gst_structure_get_int (structure, "channels", &channels);
audiocontext->samplerate = samplerate;
audiocontext->channels = channels;
audiocontext->bitdepth = 0;
if (!strcmp (mimetype, "audio/mpeg")) {
gint mpegversion = 0;
gst_structure_get_int (structure, "mpegversion", &mpegversion);
switch (mpegversion) {
case 1: {
gint layer;
gst_structure_get_int (structure, "layer", &layer);
switch (layer) {
case 1:
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_AUDIO_MPEG1_L1);
break;
case 2:
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_AUDIO_MPEG1_L2);
break;
case 3:
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_AUDIO_MPEG1_L3);
break;
}
break;
}
case 2:
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_AUDIO_MPEG2
"MAIN");
break;
case 4:
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_AUDIO_MPEG4
"MAIN");
break;
}
return GST_PAD_LINK_OK;
} else if (!strcmp (mimetype, "audio/x-raw-int")) {
gint endianness, width, depth;
gboolean signedness;
gst_structure_get_int (structure, "endianness", &endianness);
gst_structure_get_int (structure, "width", &width);
gst_structure_get_int (structure, "depth", &depth);
gst_structure_get_int (structure, "signed", &signedness);
if (width != depth ||
(width == 8 && signedness) || (width == 16 && !signedness))
return GST_PAD_LINK_REFUSED;
audiocontext->bitdepth = depth;
if (endianness == G_BIG_ENDIAN)
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_AUDIO_PCM_INT_BE);
else
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_AUDIO_PCM_INT_LE);
return GST_PAD_LINK_OK;
} else if (!strcmp (mimetype, "audio/x-raw-float")) {
/* FIXME: endianness is undefined */
} else if (!strcmp (mimetype, "audio/x-vorbis")) {
/* FIXME: private data setup needs work */
} else if (!strcmp (mimetype, "audio/x-ac3")) {
context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_AUDIO_AC3);
return GST_PAD_LINK_OK;
}
return GST_PAD_LINK_REFUSED;
}
static GstPadLinkReturn
gst_matroska_mux_subtitle_pad_link (GstPad *pad,
const GstCaps *caps)
{
/* Consider this as boilerplate code for now. There is
* no single subtitle creation element in GStreamer,
* neither do I know how subtitling works at all. */
return GST_PAD_LINK_REFUSED;
}
static GstPad *
gst_matroska_mux_request_new_pad (GstElement *element,
GstPadTemplate *templ,
const gchar *pad_name)
{
GstElementClass *klass = GST_ELEMENT_GET_CLASS (element);
GstMatroskaMux *mux = GST_MATROSKA_MUX (element);
GstPad *pad = NULL;
gchar *name = NULL;
GstPadLinkFunction linkfunc = NULL;
GstMatroskaTrackContext *context = NULL;
if (templ == gst_element_class_get_pad_template (klass, "audio_%d")) {
name = g_strdup_printf ("audio_%d", mux->num_a_streams++);
linkfunc = gst_matroska_mux_audio_pad_link;
context = (GstMatroskaTrackContext *)
g_new0 (GstMatroskaTrackAudioContext, 1);
context->type = GST_MATROSKA_TRACK_TYPE_AUDIO;
context->name = g_strdup ("Audio");
} else if (templ == gst_element_class_get_pad_template (klass, "video_%d")) {
name = g_strdup_printf ("video_%d", mux->num_v_streams++);
linkfunc = gst_matroska_mux_video_pad_link;
context = (GstMatroskaTrackContext *)
g_new0 (GstMatroskaTrackVideoContext, 1);
context->type = GST_MATROSKA_TRACK_TYPE_VIDEO;
context->name = g_strdup ("Video");
} else if (templ == gst_element_class_get_pad_template (klass, "subtitle_%d")) {
name = g_strdup_printf ("subtitle_%d", mux->num_t_streams++);
linkfunc = gst_matroska_mux_subtitle_pad_link;
context = (GstMatroskaTrackContext *)
g_new0 (GstMatroskaTrackSubtitleContext, 1);
context->type = GST_MATROSKA_TRACK_TYPE_SUBTITLE;
context->name = g_strdup ("Subtitle");
} else {
g_warning ("matroskamux: this is not our template!");
return NULL;
}
pad = gst_pad_new_from_template (templ, name);
g_free (name);
gst_element_add_pad (element, pad);
gst_pad_set_link_function (pad, linkfunc);
context->index = mux->num_streams++;
mux->sink[context->index].track = context;
context->pad = pad;
context->flags = GST_MATROSKA_TRACK_ENABLED |
GST_MATROSKA_TRACK_DEFAULT;
return pad;
}
static void
gst_matroska_mux_track_header (GstMatroskaMux *mux,
GstMatroskaTrackContext *context)
{
GstEbmlWrite *ebml = GST_EBML_WRITE (mux);
guint64 master;
/* track type goes before the type-specific stuff */
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_TRACKNUMBER, context->num);
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_TRACKTYPE, context->type);
/* type-specific stuff */
switch (context->type) {
case GST_MATROSKA_TRACK_TYPE_VIDEO: {
GstMatroskaTrackVideoContext *videocontext =
(GstMatroskaTrackVideoContext *) context;
/* framerate, but not in the video part */
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_TRACKDEFAULTDURATION,
context->default_duration);
master = gst_ebml_write_master_start (ebml,
GST_MATROSKA_ID_TRACKVIDEO);
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_VIDEOPIXELWIDTH,
videocontext->pixel_width);
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_VIDEOPIXELHEIGHT,
videocontext->pixel_height);
if (videocontext->display_width && videocontext->display_height) {
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_VIDEODISPLAYWIDTH,
videocontext->display_width);
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_VIDEODISPLAYHEIGHT,
videocontext->display_height);
}
if (context->flags & GST_MATROSKA_VIDEOTRACK_INTERLACED)
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_VIDEOFLAGINTERLACED, 1);
if (videocontext->fourcc) {
guint32 fcc_le = GUINT32_TO_LE (videocontext->fourcc);
gst_ebml_write_binary (ebml, GST_MATROSKA_ID_VIDEOCOLOURSPACE,
(gpointer) &fcc_le, 4);
}
gst_ebml_write_master_finish (ebml, master);
break;
}
case GST_MATROSKA_TRACK_TYPE_AUDIO: {
GstMatroskaTrackAudioContext *audiocontext =
(GstMatroskaTrackAudioContext *) context;
master = gst_ebml_write_master_start (ebml,
GST_MATROSKA_ID_TRACKAUDIO);
if (audiocontext->samplerate != 8000)
gst_ebml_write_float (ebml, GST_MATROSKA_ID_AUDIOSAMPLINGFREQ,
audiocontext->samplerate);
if (audiocontext->channels != 1)
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_AUDIOCHANNELS,
audiocontext->channels);
if (audiocontext->bitdepth) {
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_AUDIOBITDEPTH,
audiocontext->bitdepth);
}
gst_ebml_write_master_finish (ebml, master);
break;
}
default:
/* doesn't need type-specific data */
break;
}
gst_ebml_write_ascii (ebml, GST_MATROSKA_ID_CODECID,
context->codec_id);
if (context->codec_priv)
gst_ebml_write_binary (ebml, GST_MATROSKA_ID_CODECPRIVATE,
context->codec_priv, context->codec_priv_size);
/* FIXME: until we have a nice way of getting the codecname
* out of the caps, I'm not going to enable this. Too much
* (useless, double, boring) work... */
/*gst_ebml_write_utf8 (ebml, GST_MATROSKA_ID_CODECNAME,
context->codec_name);*/
gst_ebml_write_utf8 (ebml, GST_MATROSKA_ID_TRACKNAME,
context->name);
}
static void
gst_matroska_mux_start (GstMatroskaMux *mux)
{
GstEbmlWrite *ebml = GST_EBML_WRITE (mux);
guint32 seekhead_id[] = { GST_MATROSKA_ID_INFO,
GST_MATROSKA_ID_TRACKS,
GST_MATROSKA_ID_CUES,
#if 0
GST_MATROSKA_ID_TAGS,
#endif
0 };
guint64 master, child;
gint i;
guint tracknum = 1;
/* we start with a EBML header */
gst_ebml_write_header (ebml, "matroska", 1);
/* start a segment */
mux->segment_pos = gst_ebml_write_master_start (ebml, GST_MATROSKA_ID_SEGMENT);
mux->segment_master = ebml->pos;
/* the rest of the header is cached */
gst_ebml_write_set_cache (ebml, 0x1000);
/* seekhead (table of contents) - we set the positions later */
mux->seekhead_pos = ebml->pos;
master = gst_ebml_write_master_start (ebml, GST_MATROSKA_ID_SEEKHEAD);
for (i = 0; seekhead_id[i] != 0; i++) {
child = gst_ebml_write_master_start (ebml, GST_MATROSKA_ID_SEEKENTRY);
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_SEEKID, seekhead_id[i]);
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_SEEKPOSITION, -1);
gst_ebml_write_master_finish (ebml, child);
}
gst_ebml_write_master_finish (ebml, master);
/* segment info */
mux->info_pos = ebml->pos;
master = gst_ebml_write_master_start (ebml, GST_MATROSKA_ID_INFO);
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_TIMECODESCALE, mux->time_scale);
mux->duration_pos = ebml->pos;
gst_ebml_write_float (ebml, GST_MATROSKA_ID_DURATION, 0);
gst_ebml_write_utf8 (ebml, GST_MATROSKA_ID_MUXINGAPP, "GStreamer");
if (mux->metadata &&
gst_structure_has_field (gst_caps_get_structure(mux->metadata,0),
"application")) {
const gchar *app;
app = gst_structure_get_string (gst_caps_get_structure(mux->metadata, 0),
"application");
if (app && app[0]) {
gst_ebml_write_utf8 (ebml, GST_MATROSKA_ID_WRITINGAPP, app);
}
}
/* FIXME: how do I get this? Automatic? Via tags? */
/*gst_ebml_write_date (ebml, GST_MATROSKA_ID_DATEUTC, 0);*/
gst_ebml_write_master_finish (ebml, master);
/* tracks */
mux->tracks_pos = ebml->pos;
master = gst_ebml_write_master_start (ebml, GST_MATROSKA_ID_TRACKS);
for (i = 0; i < mux->num_streams; i++) {
if (GST_PAD_IS_USABLE (mux->sink[i].track->pad)) {
mux->sink[i].track->num = tracknum++;
child = gst_ebml_write_master_start (ebml, GST_MATROSKA_ID_TRACKENTRY);
gst_matroska_mux_track_header (mux, mux->sink[i].track);
gst_ebml_write_master_finish (ebml, child);
}
}
gst_ebml_write_master_finish (ebml, master);
/* lastly, flush the cache */
gst_ebml_write_flush_cache (ebml);
}
static void
gst_matroska_mux_finish (GstMatroskaMux *mux)
{
GstEbmlWrite *ebml = GST_EBML_WRITE (mux);
guint64 pos;
/* cues */
if (mux->index != NULL) {
guint n;
guint64 master, pointentry_master, trackpos_master;
mux->cues_pos = ebml->pos;
gst_ebml_write_set_cache (ebml, 12 + 41 * mux->num_indexes);
master = gst_ebml_write_master_start (ebml, GST_MATROSKA_ID_CUES);
for (n = 0; n < mux->num_indexes; n++) {
GstMatroskaIndex *idx = &mux->index[n];
pointentry_master = gst_ebml_write_master_start (ebml,
GST_MATROSKA_ID_POINTENTRY);
gst_ebml_write_date (ebml, GST_MATROSKA_ID_CUETIME,
idx->time / mux->time_scale);
trackpos_master = gst_ebml_write_master_start (ebml,
GST_MATROSKA_ID_CUETRACKPOSITION);
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_CUETRACK, idx->track);
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_CUECLUSTERPOSITION,
idx->pos - mux->segment_master);
gst_ebml_write_master_finish (ebml, trackpos_master);
gst_ebml_write_master_finish (ebml, pointentry_master);
}
gst_ebml_write_master_finish (ebml, master);
gst_ebml_write_flush_cache (ebml);
}
/* FIXME: tags */
/* update seekhead. We know that:
* - a seekhead contains 4 entries.
* - order of entries is as above.
* - a seekhead has a 4-byte header + 8-byte length
* - each entry is 2-byte master, 2-byte ID pointer,
* 2-byte length pointer, all 8/1-byte length, 4-
* byte ID and 8-byte length pointer, where the
* length pointer starts at 20.
* - all entries are local to the segment (so pos - segment_master).
* - so each entry is at 12 + 20 + num * 28. */
gst_ebml_replace_uint (ebml, mux->seekhead_pos + 32,
mux->info_pos - mux->segment_master);
gst_ebml_replace_uint (ebml, mux->seekhead_pos + 60,
mux->tracks_pos - mux->segment_master);
if (mux->index != NULL) {
gst_ebml_replace_uint (ebml, mux->seekhead_pos + 88,
mux->cues_pos - mux->segment_master);
} else {
/* void'ify */
guint64 my_pos = ebml->pos;
gst_ebml_write_seek (ebml, mux->seekhead_pos + 68);
gst_ebml_write_buffer_header (ebml, GST_EBML_ID_VOID, 26);
gst_ebml_write_seek (ebml, my_pos);
}
#if 0
gst_ebml_replace_uint (ebml, mux->seekhead_pos + 116,
mux->tags_pos - mux->segment_master);
#endif
/* update duration */
pos = GST_EBML_WRITE (mux)->pos;
gst_ebml_write_seek (ebml, mux->duration_pos);
gst_ebml_write_float (ebml, GST_MATROSKA_ID_DURATION,
mux->duration / mux->time_scale);
gst_ebml_write_seek (ebml, pos);
/* finish segment - this also writes element length */
gst_ebml_write_master_finish (ebml, mux->segment_pos);
}
static gint
gst_matroska_mux_prepare_data (GstMatroskaMux *mux)
{
gint i, first = -1;
for (i = 0; i < mux->num_streams; i++) {
while (!mux->sink[i].eos && !mux->sink[i].buffer &&
mux->sink[i].track->num > 0 &&
GST_PAD_IS_USABLE (mux->sink[i].track->pad)) {
GstData *data;
data = gst_pad_pull (mux->sink[i].track->pad);
if (GST_IS_EVENT (data)) {
if (GST_EVENT_TYPE (GST_EVENT (data)) == GST_EVENT_EOS)
mux->sink[i].eos = TRUE;
gst_event_unref (GST_EVENT (data));
} else {
mux->sink[i].buffer = GST_BUFFER (data);
}
}
if (mux->sink[i].buffer) {
if (first < 0 || GST_BUFFER_TIMESTAMP (mux->sink[i].buffer) <
GST_BUFFER_TIMESTAMP (mux->sink[first].buffer))
first = i;
}
}
return first;
}
static void
gst_matroska_mux_write_data (GstMatroskaMux *mux)
{
GstEbmlWrite *ebml = GST_EBML_WRITE (mux);
GstBuffer *buf, *hdr;
gint i;
guint64 cluster, blockgroup;
/* which stream-num to write from? */
if ((i = gst_matroska_mux_prepare_data (mux)) < 0) {
GstEvent *event = gst_event_new (GST_EVENT_EOS);
gst_matroska_mux_finish (mux);
gst_pad_push (mux->srcpad, GST_DATA (event));
gst_element_set_eos (GST_ELEMENT (mux));
return;
}
/* write data */
buf = mux->sink[i].buffer;
mux->sink[i].buffer = NULL;
/* We currently write an index entry for each keyframe in a
* video track. This can be largely improved, such as doing
* one for each keyframe or each second (for all-keyframe
* streams), only the *first* video track or the audio track
* if we have no video tracks. But that'll come later... */
if (mux->sink[i].track->type == GST_MATROSKA_TRACK_TYPE_VIDEO &&
GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_KEY_UNIT)) {
GstMatroskaIndex *idx;
if (mux->num_indexes % 32 == 0) {
mux->index = g_renew (GstMatroskaIndex, mux->index,
mux->num_indexes + 32);
}
idx = &mux->index[mux->num_indexes++];
idx->pos = ebml->pos;
idx->time = GST_BUFFER_TIMESTAMP (buf);
idx->track = mux->sink[i].track->num;
}
/* write one cluster with one blockgroup with one block with
* one slice (*breath*).
* FIXME: lacing, multiple frames/cluster, etc. */
cluster = gst_ebml_write_master_start (ebml, GST_MATROSKA_ID_CLUSTER);
gst_ebml_write_uint (ebml, GST_MATROSKA_ID_CLUSTERTIMECODE,
GST_BUFFER_TIMESTAMP (buf) / mux->time_scale);
blockgroup = gst_ebml_write_master_start (ebml, GST_MATROSKA_ID_BLOCKGROUP);
gst_ebml_write_buffer_header (ebml, GST_MATROSKA_ID_BLOCK,
GST_BUFFER_SIZE (buf) + 4);
hdr = gst_buffer_new_and_alloc (4);
/* track num - FIXME: what if num >= 0x80 (unlikely)? */
GST_BUFFER_DATA (hdr)[0] = mux->sink[i].track->num | 0x80;
/* time relative to clustertime - we don't use this yet */
* (guint16 *) &GST_BUFFER_DATA (hdr)[1] = GUINT16_TO_BE (0);
/* flags - no lacing (yet) */
GST_BUFFER_DATA (hdr)[3] = 0;
gst_ebml_write_buffer (ebml, hdr);
gst_ebml_write_buffer (ebml, buf);
gst_ebml_write_master_finish (ebml, blockgroup);
gst_ebml_write_master_finish (ebml, cluster);
}
static void
gst_matroska_mux_loop (GstElement *element)
{
GstMatroskaMux *mux = GST_MATROSKA_MUX (element);
/* start with a header */
if (mux->state == GST_MATROSKA_MUX_STATE_START) {
mux->state = GST_MATROSKA_MUX_STATE_HEADER;
gst_matroska_mux_start (mux);
mux->state = GST_MATROSKA_MUX_STATE_DATA;
}
/* do one single buffer */
gst_matroska_mux_write_data (mux);
}
static GstElementStateReturn
gst_matroska_mux_change_state (GstElement *element)
{
GstMatroskaMux *mux = GST_MATROSKA_MUX (element);
switch (GST_STATE_TRANSITION (element)) {
case GST_STATE_PAUSED_TO_READY:
gst_matroska_mux_reset (GST_ELEMENT (mux));
break;
default:
break;
}
if (((GstElementClass *) parent_class)->change_state)
return ((GstElementClass *) parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
static void
gst_matroska_mux_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GstMatroskaMux *mux;
g_return_if_fail (GST_IS_MATROSKA_MUX (object));
mux = GST_MATROSKA_MUX (object);
switch (prop_id) {
case ARG_METADATA:
gst_caps_replace (&mux->metadata,
g_value_get_boxed (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_matroska_mux_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GstMatroskaMux *mux;
g_return_if_fail (GST_IS_MATROSKA_MUX (object));
mux = GST_MATROSKA_MUX (object);
switch (prop_id) {
case ARG_METADATA:
g_value_set_boxed (value, mux->metadata);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
gboolean
gst_matroska_mux_plugin_init (GstPlugin *plugin)
{
return gst_element_register (plugin, "matroskamux",
GST_RANK_NONE,
GST_TYPE_MATROSKA_MUX);
}
Reference in a new issue View git blame Copy permalink