mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-28 11:10:37 +00:00
encoding-profile: Fix documentation and port to gtk markdown
And remove some trailling whitepsaces
This commit is contained in:
Thibault Saunier
parent
6f50b59a20
commit
d67f945177
3 changed files with 105 additions and 123 deletions
|
|
@ -22,114 +22,102 @@
|
|||
* SECTION:encoding-profile
|
||||
* @short_description: Encoding profile library
|
||||
*
|
||||
* <refsect2>
|
||||
* <para>
|
||||
* Functions to create and handle encoding profiles.
|
||||
* </para>
|
||||
* <para>
|
||||
* Encoding profiles describe the media types and settings one wishes to use for
|
||||
* an encoding process. The top-level profiles are commonly
|
||||
*
|
||||
* Encoding profiles describe the media types and settings one wishes to use
|
||||
* for an encoding process. The top-level profiles are commonly
|
||||
* #GstEncodingContainerProfile(s) (which contains a user-readable name and
|
||||
* description along with which container format to use). These, in turn,
|
||||
* reference one or more #GstEncodingProfile(s) which indicate which encoding
|
||||
* format should be used on each individual streams.
|
||||
* </para>
|
||||
* <para>
|
||||
* #GstEncodingProfile(s) can be provided to the 'encodebin' element, which will take
|
||||
* care of selecting and setting up the required elements to produce an output stream
|
||||
* conforming to the specifications of the profile.
|
||||
* </para>
|
||||
* <para>
|
||||
* Unlike other systems, the encoding profiles do not specify which #GstElement to use
|
||||
* for the various encoding and muxing steps, but instead relies on specifying the format
|
||||
* one wishes to use.
|
||||
* </para>
|
||||
* <para>
|
||||
* Encoding profiles can be created at runtime by the application or loaded from (and saved
|
||||
* to) file using the #GstEncodingTarget API.
|
||||
* </para>
|
||||
* </refsect2>
|
||||
*
|
||||
* <refsect2 id="gst-validate-transcoding--encoding-profile">
|
||||
* <title>The encoding profile serialization format</title>
|
||||
* <para>This is the serialization format of a <link linkend="GstEncodingProfile"><type>GstEncodingProfile</type></link>.</para>
|
||||
* <para>
|
||||
* Internally the transcoding application uses <link linkend="GstEncodeBin"><type>GstEncodeBin</type></link>. <command>gst-validate-transcoding-&GST_API_VERSION;</command> uses its own
|
||||
* serialization format to describe the <link linkend="GstEncodeBin--profile"><type>GstEncodeBin.profile</type></link>
|
||||
* property of the encodebin.
|
||||
* </para>
|
||||
* <para>
|
||||
* The simplest serialized profile looks like:
|
||||
* </para>
|
||||
* <informalexample>
|
||||
* <programlisting>muxer_source_caps:videoencoder_source_caps:audioencoder_source_caps</programlisting>
|
||||
* </informalexample>
|
||||
* <para>
|
||||
* For example to encode a stream into a WebM container, with an OGG audio stream and a VP8 video stream,
|
||||
* the serialized <link linkend="GstEncodingProfile"><type>GstEncodingProfile</type></link> will look like:
|
||||
* </para>
|
||||
* <informalexample>
|
||||
* <programlisting>video/webm:video/x-vp8:audio/x-vorbis</programlisting>
|
||||
* </informalexample>
|
||||
* <para>
|
||||
* You can also set the preset name of the encoding profile using the caps+preset_name syntax as in:
|
||||
* </para>
|
||||
* <informalexample>
|
||||
* <programlisting>video/webm:video/x-vp8+youtube-preset:audio/x-vorbis</programlisting>
|
||||
* </informalexample>
|
||||
* <para>
|
||||
* Moreover, you can set the <link linkend="gst-encoding-profile-set-presence">presence</link> property of an
|
||||
* encoding profile using the <code>|presence</code> syntax as in:
|
||||
* </para>
|
||||
* <informalexample>
|
||||
* <programlisting>video/webm:video/x-vp8|1:audio/x-vorbis</programlisting>
|
||||
* </informalexample>
|
||||
* <para>
|
||||
* This field allows you to specify how many times maximum a <link linkend="GstEncodingProfile"><type>GstEncodingProfile</type></link> can be used inside an encodebin.
|
||||
* </para>
|
||||
* <para>
|
||||
* You can also use the <code>restriction_caps->encoded_format_caps</code> syntax to specify the
|
||||
* <link linked="gst-encoding-profile-get-restriction">restriction caps</link>
|
||||
* to be set on a <link linkend="GstEncodingProfile"><type>GstEncodingProfile</type></link>. It corresponds to the
|
||||
* restriction <link linkend="GstCaps"><type>GstCaps</type></link> to apply before
|
||||
* the encoder that will be used in the profile. The fields present in restriction
|
||||
* caps are properties of the raw stream (that is, before encoding), such as height
|
||||
* and width for video and depth and sampling rate for audio. This property does not
|
||||
* make sense for muxers.
|
||||
* </para>
|
||||
* <para>
|
||||
* To force a video stream to be encoded with a Full HD resolution (using WebM as the container format,
|
||||
* VP8 as the video codec and Vorbis as the audio codec), you should use:
|
||||
* </para>
|
||||
* <informalexample>
|
||||
* <programlisting>video/webm:video/x-raw,width=1920,height=1080->video/x-vp8:audio/x-vorbis</programlisting>
|
||||
* </informalexample>
|
||||
* <refsect3>
|
||||
* <title>Some serialized encoding formats examples:</title>
|
||||
* <para>
|
||||
* MP3 audio and H264 in MP4:
|
||||
* </para>
|
||||
* <informalexample>
|
||||
* <programlisting>video/quicktime,variant=iso:video/x-h264:audio/mpeg,mpegversion=1,layer=3</programlisting>
|
||||
* </informalexample>
|
||||
* <para>
|
||||
* Vorbis and theora in OGG:
|
||||
* </para>
|
||||
* <informalexample>
|
||||
* <programlisting>application/ogg:video/x-theora:audio/x-vorbis</programlisting>
|
||||
* </informalexample>
|
||||
* <para>
|
||||
* AC3 and H264 in MPEG-TS:
|
||||
* </para>
|
||||
* <informalexample>
|
||||
* <programlisting>video/mpegts:video/x-h264:audio/x-ac3</programlisting>
|
||||
* </informalexample>
|
||||
* </refsect3>
|
||||
* </refsect2>
|
||||
* <refsect2>
|
||||
* <title>Example: Creating a profile</title>
|
||||
* <para>
|
||||
* #GstEncodingProfile(s) can be provided to the 'encodebin' element, which
|
||||
* will take care of selecting and setting up the required elements to produce
|
||||
* an output stream conforming to the specifications of the profile.
|
||||
*
|
||||
* Unlike other systems, the encoding profiles do not specify which #GstElement
|
||||
* to use for the various encoding and muxing steps, but instead relies on
|
||||
* specifying the format one wishes to use.
|
||||
*
|
||||
* Encoding profiles can be created at runtime by the application or loaded
|
||||
* from (and saved to) file using the #GstEncodingTarget API.
|
||||
*
|
||||
* # The encoding profile serialization format
|
||||
*
|
||||
* This is the serialization format of a #GstEncodingProfile The simplest
|
||||
* serialized profile looks like:
|
||||
*
|
||||
* |[
|
||||
* muxer_source_caps:videoencoder_source_caps:audioencoder_source_caps
|
||||
* ]|
|
||||
*
|
||||
* For example to encode a stream into a WebM container, with an OGG audio
|
||||
* stream and a VP8 video stream, the serialized #GstEncodingProfilewill look
|
||||
* like:
|
||||
*
|
||||
* |[
|
||||
* video/webm:video/x-vp8:audio/x-vorbis
|
||||
* ]|
|
||||
*
|
||||
* You can also set the preset name of the encoding profile using the
|
||||
* caps+preset_name syntax as in:
|
||||
*
|
||||
* |[
|
||||
* video/webm:video/x-vp8+youtube-preset:audio/x-vorbis
|
||||
* ]|
|
||||
*
|
||||
* Moreover, you can set the `presence` property of an
|
||||
* encoding profile using the `|presence` syntax as in:
|
||||
*
|
||||
* |[
|
||||
* video/webm:video/x-vp8|1:audio/x-vorbis
|
||||
* ]|
|
||||
*
|
||||
* This field allows specifies the maximum number of times a
|
||||
* #GstEncodingProfile can be used inside an encodebin. If 0, it is not a
|
||||
* mandatory stream.
|
||||
*
|
||||
* You can also use the `restriction_caps->encoded_format_caps` syntax to
|
||||
* specify the restriction caps to be set on a #GstEncodingProfile
|
||||
*
|
||||
* It corresponds to the restriction #GstCaps to apply before the encoder that
|
||||
* will be used in the profile. The fields present in restriction caps are
|
||||
* properties of the raw stream (that is, before encoding), such as height and
|
||||
* width for video and depth and sampling rate for audio. This property does
|
||||
* not make sense for muxers. See #gst_encoding_profile_get_restriction for
|
||||
* more details.
|
||||
*
|
||||
* To force a video stream to be encoded with a Full HD resolution (using WebM
|
||||
* as the container format, VP8 as the video codec and Vorbis as the audio
|
||||
* codec), you should use:
|
||||
*
|
||||
* |[
|
||||
* video/webm:video/x-raw,width=1920,height=1080->video/x-vp8:audio/x-vorbis
|
||||
* ]|
|
||||
*
|
||||
* ## Some serialized encoding formats examples:
|
||||
*
|
||||
* MP3 audio and H264 in MP4:
|
||||
*
|
||||
* |[
|
||||
* video/quicktime,variant=iso:video/x-h264:audio/mpeg,mpegversion=1,layer=3
|
||||
* ]|
|
||||
*
|
||||
* Vorbis and theora in OGG:
|
||||
*
|
||||
* |[
|
||||
* application/ogg:video/x-theora:audio/x-vorbis
|
||||
* ]|
|
||||
*
|
||||
* AC3 and H264 in MPEG-TS:
|
||||
*
|
||||
* |[
|
||||
* video/mpegts:video/x-h264:audio/x-ac3
|
||||
* ]|
|
||||
*
|
||||
* # Example: Creating a profile
|
||||
*
|
||||
* |[<!-- language="c" -->
|
||||
* #include <gst/pbutils/encoding-profile.h>
|
||||
* ...
|
||||
* GstEncodingProfile *
|
||||
|
|
@ -159,12 +147,10 @@
|
|||
*
|
||||
*
|
||||
* ]|
|
||||
* </para>
|
||||
* </refsect2>
|
||||
* <refsect2>
|
||||
* <title>Example: Using an encoder preset with a profile</title>
|
||||
* <para>
|
||||
* |[
|
||||
*
|
||||
* # Example: Using an encoder preset with a profile
|
||||
*
|
||||
* |[ <!-- language="c" -->
|
||||
* #include <gst/pbutils/encoding-profile.h>
|
||||
* ...
|
||||
* GstEncodingProfile *
|
||||
|
|
@ -204,12 +190,10 @@
|
|||
*
|
||||
*
|
||||
* ]|
|
||||
* </para>
|
||||
* </refsect2>
|
||||
* <refsect2>
|
||||
* <title>Example: Listing categories, targets and profiles</title>
|
||||
* <para>
|
||||
* |[
|
||||
*
|
||||
* # Example: Listing categories, targets and profiles
|
||||
*
|
||||
* |[ <!-- language="C" -->
|
||||
* #include <gst/pbutils/encoding-profile.h>
|
||||
* ...
|
||||
* GstEncodingProfile *prof;
|
||||
|
|
@ -238,8 +222,6 @@
|
|||
*
|
||||
* ...
|
||||
* ]|
|
||||
* </para>
|
||||
* </refsect2>
|
||||
*/
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
|
|
|
|||
|
|
@ -1204,7 +1204,7 @@ _create_stream_group (GstEncodeBin * ebin, GstEncodingProfile * sprof,
|
|||
sgroup->profile = sprof;
|
||||
|
||||
/* NOTE for people reading this code:
|
||||
*
|
||||
*
|
||||
* We construct the group starting by the furthest downstream element
|
||||
* and making our way up adding/syncing/linking as we go.
|
||||
*
|
||||
|
|
@ -1881,7 +1881,7 @@ create_elements_and_pads (GstEncodeBin * ebin)
|
|||
|
||||
/* 2. Ghost the muxer source pad */
|
||||
|
||||
/* FIXME : We should figure out if it's a static/request/dyamic pad,
|
||||
/* FIXME : We should figure out if it's a static/request/dyamic pad,
|
||||
* but for the time being let's assume it's a static pad :) */
|
||||
muxerpad = gst_element_get_static_pad (muxer, "src");
|
||||
if (G_UNLIKELY (muxerpad == NULL))
|
||||
|
|
|
|||
|
|
@ -2079,7 +2079,7 @@ static GstStaticCaps multipart_caps =
|
|||
GST_STATIC_CAPS ("multipart/x-mixed-replace");
|
||||
#define MULTIPART_CAPS gst_static_caps_get(&multipart_caps)
|
||||
|
||||
/* multipart/x-mixed replace is:
|
||||
/* multipart/x-mixed replace is:
|
||||
* <maybe some whitespace>--<some ascii chars>[\r]\n
|
||||
* <more ascii chars>[\r]\nContent-type:<more ascii>[\r]\n */
|
||||
static void
|
||||
|
|
@ -2136,7 +2136,7 @@ static GstStaticCaps mpeg_sys_caps = GST_STATIC_CAPS ("video/mpeg, "
|
|||
#define IS_MPEG_PES_HEADER(data) (IS_MPEG_HEADER (data) && \
|
||||
IS_MPEG_PES_CODE (((guint8 *)(data))[3]))
|
||||
|
||||
#define MPEG2_MAX_PROBE_LENGTH (128 * 1024) /* 128kB should be 64 packs of the
|
||||
#define MPEG2_MAX_PROBE_LENGTH (128 * 1024) /* 128kB should be 64 packs of the
|
||||
* most common 2kB pack size. */
|
||||
|
||||
#define MPEG2_MIN_SYS_HEADERS 2
|
||||
|
|
@ -2356,7 +2356,7 @@ mpeg_sys_type_find (GstTypeFind * tf, gpointer unused)
|
|||
}
|
||||
|
||||
/* If we at least saw MIN headers, and *some* were pes headers (pack headers
|
||||
* are optional in an mpeg system stream) then return a lower-probability
|
||||
* are optional in an mpeg system stream) then return a lower-probability
|
||||
* result */
|
||||
if (pes_headers > 0 && (pack_headers + pes_headers) > MPEG2_MIN_SYS_HEADERS)
|
||||
goto suggest;
|
||||
|
|
@ -2448,7 +2448,7 @@ mpeg_ts_probe_headers (GstTypeFind * tf, guint64 offset, gint packet_size)
|
|||
static void
|
||||
mpeg_ts_type_find (GstTypeFind * tf, gpointer unused)
|
||||
{
|
||||
/* TS packet sizes to test: normal, DVHS packet size and
|
||||
/* TS packet sizes to test: normal, DVHS packet size and
|
||||
* FEC with 16 or 20 byte codes packet size. */
|
||||
const gint pack_sizes[] = { 188, 192, 204, 208 };
|
||||
const guint8 *data = NULL;
|
||||
|
|
@ -2477,7 +2477,7 @@ mpeg_ts_type_find (GstTypeFind * tf, gpointer unused)
|
|||
if (found >= GST_MPEGTS_TYPEFIND_MIN_HEADERS) {
|
||||
gint probability;
|
||||
|
||||
/* found at least 4 headers. 10 headers = MAXIMUM probability.
|
||||
/* found at least 4 headers. 10 headers = MAXIMUM probability.
|
||||
* Arbitrarily, I assigned 10% probability for each header we
|
||||
* found, 40% -> 100% */
|
||||
probability = MIN (10 * found, GST_TYPE_FIND_MAXIMUM);
|
||||
|
|
@ -2719,7 +2719,7 @@ h264_video_type_find (GstTypeFind * tf, gpointer unused)
|
|||
{
|
||||
DataScanCtx c = { 0, NULL, 0 };
|
||||
|
||||
/* Stream consists of: a series of sync codes (00 00 00 01) followed
|
||||
/* Stream consists of: a series of sync codes (00 00 00 01) followed
|
||||
* by NALs
|
||||
*/
|
||||
gboolean seen_idr = FALSE;
|
||||
|
|
|
|||
Loading…
Reference in a new issue