gstreamer/gst/vaapi/gstvaapiencode_h264.c

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/*
* gstvaapiencode_h264.c - VA-API H.264 encoder
*
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* Copyright (C) 2012-2014 Intel Corporation
* Author: Wind Yuan <feng.yuan@intel.com>
* Author: Gwenole Beauchesne <gwenole.beauchesne@intel.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
/**
* SECTION:element-vaapih264enc
* @short_description: A VA-API based H.264 video encoder
*
* Encodes raw video streams into H.264 bitstreams.
*
* The #GstVaapiEncodeH264:rate-control property controls the type of
* encoding. In case of Constant Bitrate Encoding (CBR), the
* #GstVaapiEncodeH264:bitrate will determine the quality of the
* encoding. Alternatively, one may choose to perform Constant
* Quantizer or Variable Bitrate Encoding (VBR), in which case the
* #GstVaapiEncodeH264:bitrate is the maximum bitrate.
*
* The H264 profile that is eventually used depends on a few settings.
* If #GstVaapiEncodeH264:dct8x8 is enabled, then High profile is
* used. Otherwise, if #GstVaapiEncodeH264:cabac entropy coding is
* enabled or #GstVaapiEncodeH264:max-bframes are allowed, then Main
* Profile is in effect, and otherwise Baseline profile applies. The
* high profile is imposed by default, which is fine for most software
* players and settings, but in some cases (e.g. hardware platforms) a
* more restricted profile/level may be necessary. The recommended way
* to set a profile is to set it in the downstream caps.
*
* You can also set parameters to adjust the latency of encoding:
* #GstVaapiEncodeH264:quality-level is a number between 1-7, in the
* case of the Intel VAAPI driver, where a lower value will produce a
* higher quality output but with more latency; meanwhile a hihg
* number will produce a lower quality output with less latency. Also
* you can set #GstVaapiEncodeH264:tune, if your backend supports it,
* for low-power mode or high compression.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch-1.0 -ev videotestsrc num-buffers=60 ! timeoverlay ! vaapih264enc ! h264parse ! mp4mux ! filesink location=test.mp4
* ]|
* </refsect2>
*/
#include "gstcompat.h"
#include <gst/vaapi/gstvaapidisplay.h>
#include <gst/vaapi/gstvaapiencoder_h264.h>
#include <gst/vaapi/gstvaapiutils_h264.h>
#include "gstvaapiencode_h264.h"
#include "gstvaapipluginutil.h"
#include "gstvaapivideomemory.h"
#define GST_PLUGIN_NAME "vaapih264enc"
#define GST_PLUGIN_DESC "A VA-API based H264 video encoder"
GST_DEBUG_CATEGORY_STATIC (gst_vaapi_h264_encode_debug);
#define GST_CAT_DEFAULT gst_vaapi_h264_encode_debug
#define GST_CODEC_CAPS \
"video/x-h264, " \
"stream-format = (string) { avc, byte-stream }, " \
"alignment = (string) au"
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/* *INDENT-OFF* */
static const char gst_vaapiencode_h264_sink_caps_str[] =
GST_VAAPI_MAKE_SURFACE_CAPS ", "
GST_CAPS_INTERLACED_FALSE "; "
GST_VIDEO_CAPS_MAKE (GST_VIDEO_FORMATS_ALL) ", "
GST_CAPS_INTERLACED_FALSE;
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/* *INDENT-ON* */
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/* *INDENT-OFF* */
static const char gst_vaapiencode_h264_src_caps_str[] =
GST_CODEC_CAPS ", "
"profile = (string) { constrained-baseline, baseline, main, high, multiview-high, stereo-high }";
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/* *INDENT-ON* */
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/* *INDENT-OFF* */
static GstStaticPadTemplate gst_vaapiencode_h264_sink_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (gst_vaapiencode_h264_sink_caps_str));
/* *INDENT-ON* */
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/* *INDENT-OFF* */
static GstStaticPadTemplate gst_vaapiencode_h264_src_factory =
GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (gst_vaapiencode_h264_src_caps_str));
/* *INDENT-ON* */
/* h264 encode */
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G_DEFINE_TYPE (GstVaapiEncodeH264, gst_vaapiencode_h264, GST_TYPE_VAAPIENCODE);
static void
gst_vaapiencode_h264_init (GstVaapiEncodeH264 * encode)
{
gst_vaapiencode_init_properties (GST_VAAPIENCODE_CAST (encode));
}
static void
gst_vaapiencode_h264_finalize (GObject * object)
{
GstVaapiEncodeH264 *const encode = GST_VAAPIENCODE_H264_CAST (object);
gst_caps_replace (&encode->available_caps, NULL);
G_OBJECT_CLASS (gst_vaapiencode_h264_parent_class)->finalize (object);
}
static void
gst_vaapiencode_h264_set_property (GObject * object,
guint prop_id, const GValue * value, GParamSpec * pspec)
{
GstVaapiEncodeClass *const encode_class = GST_VAAPIENCODE_GET_CLASS (object);
GstVaapiEncode *const base_encode = GST_VAAPIENCODE_CAST (object);
switch (prop_id) {
default:
if (!encode_class->set_property (base_encode, prop_id, value))
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_vaapiencode_h264_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec)
{
GstVaapiEncodeClass *const encode_class = GST_VAAPIENCODE_GET_CLASS (object);
GstVaapiEncode *const base_encode = GST_VAAPIENCODE_CAST (object);
switch (prop_id) {
default:
if (!encode_class->get_property (base_encode, prop_id, value))
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstVaapiProfile
gst_vaapiencode_h264_get_profile (GstCaps * caps)
{
guint i;
for (i = 0; i < gst_caps_get_size (caps); i++) {
GstStructure *const structure = gst_caps_get_structure (caps, i);
const GValue *const value = gst_structure_get_value (structure, "profile");
if (value && G_VALUE_HOLDS_STRING (value)) {
const gchar *str = g_value_get_string (value);
if (str)
return gst_vaapi_utils_h264_get_profile_from_string (str);
}
}
return GST_VAAPI_PROFILE_UNKNOWN;
}
typedef struct
{
GstVaapiProfile best_profile;
guint best_score;
} FindBestProfileData;
static void
find_best_profile_value (FindBestProfileData * data, const GValue * value)
{
const gchar *str;
GstVaapiProfile profile;
guint score;
if (!value || !G_VALUE_HOLDS_STRING (value))
return;
str = g_value_get_string (value);
if (!str)
return;
profile = gst_vaapi_utils_h264_get_profile_from_string (str);
if (!profile)
return;
score = gst_vaapi_utils_h264_get_profile_score (profile);
if (score < data->best_score)
return;
data->best_profile = profile;
data->best_score = score;
}
static GstVaapiProfile
find_best_profile (GstCaps * caps)
{
FindBestProfileData data;
guint i, j, num_structures, num_values;
data.best_profile = GST_VAAPI_PROFILE_UNKNOWN;
data.best_score = 0;
num_structures = gst_caps_get_size (caps);
for (i = 0; i < num_structures; i++) {
GstStructure *const structure = gst_caps_get_structure (caps, i);
const GValue *const value = gst_structure_get_value (structure, "profile");
if (!value)
continue;
if (G_VALUE_HOLDS_STRING (value))
find_best_profile_value (&data, value);
else if (GST_VALUE_HOLDS_LIST (value)) {
num_values = gst_value_list_get_size (value);
for (j = 0; j < num_values; j++)
find_best_profile_value (&data, gst_value_list_get_value (value, j));
}
}
return data.best_profile;
}
static GstCaps *
get_available_caps (GstVaapiEncodeH264 * encode)
{
GstCaps *out_caps;
GArray *profiles;
GstVaapiProfile profile;
const gchar *profile_str;
GValue profile_v = G_VALUE_INIT;
GValue profile_list = G_VALUE_INIT;
guint i;
if (encode->available_caps)
return encode->available_caps;
g_value_init (&profile_list, GST_TYPE_LIST);
g_value_init (&profile_v, G_TYPE_STRING);
profiles =
gst_vaapi_display_get_encode_profiles
(GST_VAAPI_PLUGIN_BASE_DISPLAY (encode));
if (!profiles)
return NULL;
for (i = 0; i < profiles->len; i++) {
profile = g_array_index (profiles, GstVaapiProfile, i);
if (gst_vaapi_profile_get_codec (profile) != GST_VAAPI_CODEC_H264)
continue;
profile_str = gst_vaapi_profile_get_name (profile);
if (!profile_str)
continue;
g_value_set_string (&profile_v, profile_str);
gst_value_list_append_value (&profile_list, &profile_v);
}
g_array_unref (profiles);
out_caps = gst_caps_from_string (GST_CODEC_CAPS);
gst_caps_set_value (out_caps, "profile", &profile_list);
g_value_unset (&profile_list);
g_value_unset (&profile_v);
encode->available_caps = out_caps;
return encode->available_caps;
}
static gboolean
gst_vaapiencode_h264_set_config (GstVaapiEncode * base_encode)
{
GstVaapiEncodeH264 *const encode = GST_VAAPIENCODE_H264_CAST (base_encode);
GstVaapiEncoderH264 *const encoder =
GST_VAAPI_ENCODER_H264 (base_encode->encoder);
GstCaps *template_caps, *allowed_caps;
gboolean ret = TRUE;
template_caps =
gst_static_pad_template_get_caps (&gst_vaapiencode_h264_src_factory);
allowed_caps =
gst_pad_get_allowed_caps (GST_VAAPI_PLUGIN_BASE_SRC_PAD (encode));
if (allowed_caps == template_caps) {
GST_INFO_OBJECT (encode, "downstream has ANY caps, outputting byte-stream");
encode->is_avc = FALSE;
gst_caps_unref (allowed_caps);
} else if (!allowed_caps) {
GST_INFO_OBJECT (encode,
"downstream has NULL caps, outputting byte-stream");
encode->is_avc = FALSE;
} else if (gst_caps_is_empty (allowed_caps)) {
GST_INFO_OBJECT (encode, "downstream has EMPTY caps");
gst_caps_unref (template_caps);
gst_caps_unref (allowed_caps);
return FALSE;
} else {
const char *stream_format = NULL;
GstStructure *structure;
guint i, num_structures;
GstVaapiProfile profile;
GstCaps *available_caps;
available_caps = get_available_caps (encode);
if (!available_caps) {
gst_caps_unref (template_caps);
gst_caps_unref (allowed_caps);
return FALSE;
}
if (!gst_caps_can_intersect (allowed_caps, available_caps)) {
GST_INFO_OBJECT (encode, "downstream requested an unsupported profile, "
"but encoder will output a compatible one");
}
/* Check whether "stream-format" is avcC mode */
num_structures = gst_caps_get_size (allowed_caps);
for (i = 0; !stream_format && i < num_structures; i++) {
structure = gst_caps_get_structure (allowed_caps, i);
if (!gst_structure_has_field_typed (structure, "stream-format",
G_TYPE_STRING))
continue;
stream_format = gst_structure_get_string (structure, "stream-format");
}
encode->is_avc = stream_format && strcmp (stream_format, "avc") == 0;
/* Check for the largest profile that is supported */
profile = find_best_profile (available_caps);
if (profile != GST_VAAPI_PROFILE_UNKNOWN) {
GST_INFO ("using %s profile as target decoder constraints",
gst_vaapi_utils_h264_get_profile_string (profile));
ret = gst_vaapi_encoder_h264_set_max_profile (encoder, profile);
}
gst_caps_unref (allowed_caps);
}
gst_caps_unref (template_caps);
base_encode->need_codec_data = encode->is_avc;
return ret;
}
static void
set_compatible_profile (GstVaapiEncodeH264 * encode, GstCaps * caps,
GstVaapiProfile profile)
{
GstCaps *allowed_caps, *tmp_caps;
gboolean ret = FALSE;
allowed_caps =
gst_pad_get_allowed_caps (GST_VAAPI_PLUGIN_BASE_SRC_PAD (encode));
if (!allowed_caps || gst_caps_is_empty (allowed_caps)) {
if (allowed_caps)
gst_caps_unref (allowed_caps);
return;
}
tmp_caps = gst_caps_from_string (GST_CODEC_CAPS);
/* If profile doesn't exist in the allowed caps, let's find
* compatible profile in the caps.
*
* If there is one, we can set it as a compatible profile and make
* the negotiation. We consider baseline compatible with
* constrained-baseline, which is a strict subset of baseline
* profile.
*/
retry:
gst_caps_set_simple (tmp_caps, "profile", G_TYPE_STRING,
gst_vaapi_utils_h264_get_profile_string (profile), NULL);
if (!gst_caps_can_intersect (allowed_caps, tmp_caps)) {
if (profile == GST_VAAPI_PROFILE_H264_CONSTRAINED_BASELINE) {
profile = GST_VAAPI_PROFILE_H264_BASELINE;
goto retry;
}
} else {
gst_caps_set_simple (caps, "profile", G_TYPE_STRING,
gst_vaapi_utils_h264_get_profile_string (profile), NULL);
ret = TRUE;
}
if (!ret)
GST_LOG ("There is no compatible profile in the requested caps.");
gst_caps_unref (tmp_caps);
gst_caps_unref (allowed_caps);
return;
}
static GstCaps *
gst_vaapiencode_h264_get_caps (GstVaapiEncode * base_encode)
{
GstVaapiEncodeH264 *const encode = GST_VAAPIENCODE_H264_CAST (base_encode);
GstVaapiEncoderH264 *const encoder =
GST_VAAPI_ENCODER_H264 (base_encode->encoder);
GstVaapiProfile profile;
GstCaps *caps;
caps = gst_caps_from_string (GST_CODEC_CAPS);
gst_caps_set_simple (caps, "stream-format", G_TYPE_STRING,
encode->is_avc ? "avc" : "byte-stream", NULL);
/* Update profile determined by encoder */
gst_vaapi_encoder_h264_get_profile_and_level (encoder, &profile, NULL);
if (profile != GST_VAAPI_PROFILE_UNKNOWN)
set_compatible_profile (encode, caps, profile);
/* XXX: update level information */
return caps;
}
static GstVaapiEncoder *
gst_vaapiencode_h264_alloc_encoder (GstVaapiEncode * base,
GstVaapiDisplay * display)
{
return gst_vaapi_encoder_h264_new (display);
}
/* h264 NAL byte stream operations */
static guint8 *
_h264_byte_stream_next_nal (guint8 * buffer, guint32 len, guint32 * nal_size)
{
const guint8 *cur = buffer;
const guint8 *const end = buffer + len;
guint8 *nal_start = NULL;
guint32 flag = 0xFFFFFFFF;
guint32 nal_start_len = 0;
g_assert (buffer && nal_size);
if (len < 3) {
*nal_size = len;
nal_start = (len ? buffer : NULL);
return nal_start;
}
/*locate head postion */
if (!buffer[0] && !buffer[1]) {
if (buffer[2] == 1) { /* 0x000001 */
nal_start_len = 3;
} else if (!buffer[2] && len >= 4 && buffer[3] == 1) { /* 0x00000001 */
nal_start_len = 4;
}
}
nal_start = buffer + nal_start_len;
cur = nal_start;
/*find next nal start position */
while (cur < end) {
flag = ((flag << 8) | ((*cur++) & 0xFF));
if ((flag & 0x00FFFFFF) == 0x00000001) {
if (flag == 0x00000001)
*nal_size = cur - 4 - nal_start;
else
*nal_size = cur - 3 - nal_start;
break;
}
}
if (cur >= end) {
*nal_size = end - nal_start;
if (nal_start >= end) {
nal_start = NULL;
}
}
return nal_start;
}
static inline void
_start_code_to_size (guint8 nal_start_code[4], guint32 nal_size)
{
nal_start_code[0] = ((nal_size >> 24) & 0xFF);
nal_start_code[1] = ((nal_size >> 16) & 0xFF);
nal_start_code[2] = ((nal_size >> 8) & 0xFF);
nal_start_code[3] = (nal_size & 0xFF);
}
static gboolean
_h264_convert_byte_stream_to_avc (GstBuffer * buf)
{
GstMapInfo info;
guint32 nal_size;
guint8 *nal_start_code, *nal_body;
guint8 *frame_end;
g_assert (buf);
if (!gst_buffer_map (buf, &info, GST_MAP_READ | GST_MAP_WRITE))
return FALSE;
nal_start_code = info.data;
frame_end = info.data + info.size;
nal_size = 0;
while ((frame_end > nal_start_code) &&
(nal_body = _h264_byte_stream_next_nal (nal_start_code,
frame_end - nal_start_code, &nal_size)) != NULL) {
if (!nal_size)
goto error;
g_assert (nal_body - nal_start_code == 4);
_start_code_to_size (nal_start_code, nal_size);
nal_start_code = nal_body + nal_size;
}
gst_buffer_unmap (buf, &info);
return TRUE;
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/* ERRORS */
error:
{
gst_buffer_unmap (buf, &info);
return FALSE;
}
}
static GstFlowReturn
gst_vaapiencode_h264_alloc_buffer (GstVaapiEncode * base_encode,
GstVaapiCodedBuffer * coded_buf, GstBuffer ** out_buffer_ptr)
{
GstVaapiEncodeH264 *const encode = GST_VAAPIENCODE_H264_CAST (base_encode);
GstVaapiEncoderH264 *const encoder =
GST_VAAPI_ENCODER_H264 (base_encode->encoder);
GstFlowReturn ret;
g_return_val_if_fail (encoder != NULL, GST_FLOW_ERROR);
ret =
GST_VAAPIENCODE_CLASS (gst_vaapiencode_h264_parent_class)->alloc_buffer
(base_encode, coded_buf, out_buffer_ptr);
if (ret != GST_FLOW_OK)
return ret;
if (!encode->is_avc)
return GST_FLOW_OK;
/* Convert to avcC format */
if (!_h264_convert_byte_stream_to_avc (*out_buffer_ptr))
goto error_convert_buffer;
return GST_FLOW_OK;
/* ERRORS */
error_convert_buffer:
{
GST_ERROR ("failed to convert from bytestream format to avcC format");
gst_buffer_replace (out_buffer_ptr, NULL);
return GST_FLOW_ERROR;
}
}
static void
gst_vaapiencode_h264_class_init (GstVaapiEncodeH264Class * klass)
{
GObjectClass *const object_class = G_OBJECT_CLASS (klass);
GstElementClass *const element_class = GST_ELEMENT_CLASS (klass);
GstVaapiEncodeClass *const encode_class = GST_VAAPIENCODE_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (gst_vaapi_h264_encode_debug,
GST_PLUGIN_NAME, 0, GST_PLUGIN_DESC);
object_class->finalize = gst_vaapiencode_h264_finalize;
object_class->set_property = gst_vaapiencode_h264_set_property;
object_class->get_property = gst_vaapiencode_h264_get_property;
encode_class->get_properties = gst_vaapi_encoder_h264_get_default_properties;
encode_class->get_profile = gst_vaapiencode_h264_get_profile;
encode_class->set_config = gst_vaapiencode_h264_set_config;
encode_class->get_caps = gst_vaapiencode_h264_get_caps;
encode_class->alloc_encoder = gst_vaapiencode_h264_alloc_encoder;
encode_class->alloc_buffer = gst_vaapiencode_h264_alloc_buffer;
gst_element_class_set_static_metadata (element_class,
"VA-API H264 encoder",
"Codec/Encoder/Video",
GST_PLUGIN_DESC, "Wind Yuan <feng.yuan@intel.com>");
/* sink pad */
gst_element_class_add_static_pad_template (element_class,
&gst_vaapiencode_h264_sink_factory);
/* src pad */
gst_element_class_add_static_pad_template (element_class,
&gst_vaapiencode_h264_src_factory);
gst_vaapiencode_class_init_properties (encode_class);
}