mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-11-24 10:41:04 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/gst/rtp/gstrtpjpegpay.c
Aaron Boxer 46989dca96 documentation: fix a number of typos
2019-10-05 22:38:11 +00:00

1007 lines
27 KiB
C
Raw Blame History

/* GStreamer
* Copyright (C) 2008 Axis Communications <dev-gstreamer@axis.com>
* @author Bjorn Ostby <bjorn.ostby@axis.com>
* @author Peter Kjellerstedt <peter.kjellerstedt@axis.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-rtpjpegpay
* @title: rtpjpegpay
*
* Payload encode JPEG pictures into RTP packets according to RFC 2435.
* For detailed information see: http://www.rfc-editor.org/rfc/rfc2435.txt
*
* The payloader takes a JPEG picture, scans the header for quantization
* tables (if needed) and constructs the RTP packet header followed by
* the actual JPEG entropy scan.
*
* The payloader assumes that correct width and height is found in the caps.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include <gst/rtp/gstrtpbuffer.h>
#include <gst/video/video.h>
#include "gstrtpjpegpay.h"
#include "gstrtputils.h"
static GstStaticPadTemplate gst_rtp_jpeg_pay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("image/jpeg; " "video/x-jpeg")
);
static GstStaticPadTemplate gst_rtp_jpeg_pay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-rtp, "
" media = (string) \"video\", "
" payload = (int) " GST_RTP_PAYLOAD_JPEG_STRING ", "
" clock-rate = (int) 90000, "
" encoding-name = (string) \"JPEG\", "
" width = (int) [ 1, 65536 ], " " height = (int) [ 1, 65536 ]; "
" application/x-rtp, "
" media = (string) \"video\", "
" payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
" clock-rate = (int) 90000, "
" encoding-name = (string) \"JPEG\", "
" width = (int) [ 1, 65536 ], " " height = (int) [ 1, 65536 ]")
);
GST_DEBUG_CATEGORY_STATIC (rtpjpegpay_debug);
#define GST_CAT_DEFAULT (rtpjpegpay_debug)
/*
* QUANT_PREFIX_LEN:
*
* Prefix length in the header before the quantization tables:
* Two size bytes and one byte for precision
*/
#define QUANT_PREFIX_LEN 3
typedef enum _RtpJpegMarker RtpJpegMarker;
/*
* RtpJpegMarker:
* @JPEG_MARKER: Prefix for JPEG marker
* @JPEG_MARKER_SOI: Start of Image marker
* @JPEG_MARKER_JFIF: JFIF marker
* @JPEG_MARKER_CMT: Comment marker
* @JPEG_MARKER_DQT: Define Quantization Table marker
* @JPEG_MARKER_SOF: Start of Frame marker
* @JPEG_MARKER_DHT: Define Huffman Table marker
* @JPEG_MARKER_SOS: Start of Scan marker
* @JPEG_MARKER_EOI: End of Image marker
* @JPEG_MARKER_DRI: Define Restart Interval marker
* @JPEG_MARKER_H264: H264 marker
*
* Identifiers for markers in JPEG header
*/
enum _RtpJpegMarker
{
JPEG_MARKER = 0xFF,
JPEG_MARKER_SOI = 0xD8,
JPEG_MARKER_JFIF = 0xE0,
JPEG_MARKER_CMT = 0xFE,
JPEG_MARKER_DQT = 0xDB,
JPEG_MARKER_SOF = 0xC0,
JPEG_MARKER_DHT = 0xC4,
JPEG_MARKER_JPG = 0xC8,
JPEG_MARKER_SOS = 0xDA,
JPEG_MARKER_EOI = 0xD9,
JPEG_MARKER_DRI = 0xDD,
JPEG_MARKER_APP0 = 0xE0,
JPEG_MARKER_H264 = 0xE4, /* APP4 */
JPEG_MARKER_APP15 = 0xEF,
JPEG_MARKER_JPG0 = 0xF0,
JPEG_MARKER_JPG13 = 0xFD
};
#define DEFAULT_JPEG_QUANT 255
#define DEFAULT_JPEG_QUALITY 255
#define DEFAULT_JPEG_TYPE 1
enum
{
PROP_0,
PROP_JPEG_QUALITY,
PROP_JPEG_TYPE
};
enum
{
Q_TABLE_0 = 0,
Q_TABLE_1,
Q_TABLE_MAX /* only support for two tables at the moment */
};
typedef struct _RtpJpegHeader RtpJpegHeader;
/*
* RtpJpegHeader:
* @type_spec: type specific
* @offset: fragment offset
* @type: type field
* @q: quantization table for this frame
* @width: width of image in 8-pixel multiples
* @height: height of image in 8-pixel multiples
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Type-specific | Fragment Offset |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Type | Q | Width | Height |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
struct _RtpJpegHeader
{
guint type_spec:8;
guint offset:24;
guint8 type;
guint8 q;
guint8 width;
guint8 height;
};
/*
* RtpQuantHeader
* @mbz: must be zero
* @precision: specify size of quantization tables
* @length: length of quantization data
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | MBZ | Precision | Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Quantization Table Data |
* | ... |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
typedef struct
{
guint8 mbz;
guint8 precision;
guint16 length;
} RtpQuantHeader;
typedef struct
{
guint8 size;
const guint8 *data;
} RtpQuantTable;
/*
* RtpRestartMarkerHeader:
* @restartInterval: number of MCUs that appear between restart markers
* @restartFirstLastCount: a combination of the first packet mark in the chunk
* last packet mark in the chunk and the position of the
* first restart interval in the current "chunk"
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Restart Interval |F|L| Restart Count |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* The restart marker header is implemented according to the following
* methodology specified in section 3.1.7 of rfc2435.txt.
*
* "If the restart intervals in a frame are not guaranteed to be aligned
* with packet boundaries, the F (first) and L (last) bits MUST be set
* to 1 and the Restart Count MUST be set to 0x3FFF. This indicates
* that a receiver MUST reassemble the entire frame before decoding it."
*
*/
typedef struct
{
guint16 restart_interval;
guint16 restart_count;
} RtpRestartMarkerHeader;
typedef struct
{
guint8 id;
guint8 samp;
guint8 qt;
} CompInfo;
/* FIXME: restart marker header currently unsupported */
static void gst_rtp_jpeg_pay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_rtp_jpeg_pay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_rtp_jpeg_pay_setcaps (GstRTPBasePayload * basepayload,
GstCaps * caps);
static GstFlowReturn gst_rtp_jpeg_pay_handle_buffer (GstRTPBasePayload * pad,
GstBuffer * buffer);
#define gst_rtp_jpeg_pay_parent_class parent_class
G_DEFINE_TYPE (GstRtpJPEGPay, gst_rtp_jpeg_pay, GST_TYPE_RTP_BASE_PAYLOAD);
static void
gst_rtp_jpeg_pay_class_init (GstRtpJPEGPayClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstRTPBasePayloadClass *gstrtpbasepayload_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstrtpbasepayload_class = (GstRTPBasePayloadClass *) klass;
gobject_class->set_property = gst_rtp_jpeg_pay_set_property;
gobject_class->get_property = gst_rtp_jpeg_pay_get_property;
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_jpeg_pay_src_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_rtp_jpeg_pay_sink_template);
gst_element_class_set_static_metadata (gstelement_class, "RTP JPEG payloader",
"Codec/Payloader/Network/RTP",
"Payload-encodes JPEG pictures into RTP packets (RFC 2435)",
"Axis Communications <dev-gstreamer@axis.com>");
gstrtpbasepayload_class->set_caps = gst_rtp_jpeg_pay_setcaps;
gstrtpbasepayload_class->handle_buffer = gst_rtp_jpeg_pay_handle_buffer;
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_JPEG_QUALITY,
g_param_spec_int ("quality", "Quality",
"Quality factor on JPEG data (unused)", 0, 255, 255,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_JPEG_TYPE,
g_param_spec_int ("type", "Type",
"Default JPEG Type, overwritten by SOF when present", 0, 255,
DEFAULT_JPEG_TYPE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
GST_DEBUG_CATEGORY_INIT (rtpjpegpay_debug, "rtpjpegpay", 0,
"Motion JPEG RTP Payloader");
}
static void
gst_rtp_jpeg_pay_init (GstRtpJPEGPay * pay)
{
pay->quality = DEFAULT_JPEG_QUALITY;
pay->quant = DEFAULT_JPEG_QUANT;
pay->type = DEFAULT_JPEG_TYPE;
pay->width = -1;
pay->height = -1;
GST_RTP_BASE_PAYLOAD_PT (pay) = GST_RTP_PAYLOAD_JPEG;
}
static gboolean
gst_rtp_jpeg_pay_setcaps (GstRTPBasePayload * basepayload, GstCaps * caps)
{
GstStructure *caps_structure = gst_caps_get_structure (caps, 0);
GstRtpJPEGPay *pay;
gboolean res;
gint width = -1, height = -1;
gint num = 0, denom;
gchar *rate = NULL;
gchar *dim = NULL;
pay = GST_RTP_JPEG_PAY (basepayload);
/* these properties are mandatory, but they might be adjusted by the SOF, if there
* is one. */
if (!gst_structure_get_int (caps_structure, "height", &height) || height <= 0) {
goto invalid_dimension;
}
if (!gst_structure_get_int (caps_structure, "width", &width) || width <= 0) {
goto invalid_dimension;
}
if (gst_structure_get_fraction (caps_structure, "framerate", &num, &denom) &&
(num < 0 || denom <= 0)) {
goto invalid_framerate;
}
if (height > 2040 || width > 2040) {
pay->height = 0;
pay->width = 0;
} else {
pay->height = GST_ROUND_UP_8 (height) / 8;
pay->width = GST_ROUND_UP_8 (width) / 8;
}
gst_rtp_base_payload_set_options (basepayload, "video",
basepayload->pt != GST_RTP_PAYLOAD_JPEG, "JPEG", 90000);
if (num > 0) {
gdouble framerate;
gst_util_fraction_to_double (num, denom, &framerate);
rate = g_strdup_printf ("%f", framerate);
}
if (pay->width == 0) {
GST_DEBUG_OBJECT (pay,
"width or height are greater than 2040, adding x-dimensions to caps");
dim = g_strdup_printf ("%d,%d", width, height);
}
if (rate != NULL && dim != NULL) {
res = gst_rtp_base_payload_set_outcaps (basepayload, "a-framerate",
G_TYPE_STRING, rate, "x-dimensions", G_TYPE_STRING, dim, NULL);
} else if (rate != NULL && dim == NULL) {
res = gst_rtp_base_payload_set_outcaps (basepayload, "a-framerate",
G_TYPE_STRING, rate, NULL);
} else if (rate == NULL && dim != NULL) {
res = gst_rtp_base_payload_set_outcaps (basepayload, "x-dimensions",
G_TYPE_STRING, dim, NULL);
} else {
res = gst_rtp_base_payload_set_outcaps (basepayload, NULL);
}
g_free (dim);
g_free (rate);
return res;
/* ERRORS */
invalid_dimension:
{
GST_ERROR_OBJECT (pay, "Invalid width/height from caps");
return FALSE;
}
invalid_framerate:
{
GST_ERROR_OBJECT (pay, "Invalid framerate from caps");
return FALSE;
}
}
static guint
gst_rtp_jpeg_pay_header_size (const guint8 * data, guint offset)
{
return data[offset] << 8 | data[offset + 1];
}
static guint
gst_rtp_jpeg_pay_read_quant_table (const guint8 * data, guint size,
guint offset, RtpQuantTable tables[])
{
guint quant_size, tab_size;
guint8 prec;
guint8 id;
if (offset + 2 > size)
goto too_small;
quant_size = gst_rtp_jpeg_pay_header_size (data, offset);
if (quant_size < 2)
goto small_quant_size;
/* clamp to available data */
if (offset + quant_size > size)
quant_size = size - offset;
offset += 2;
quant_size -= 2;
while (quant_size > 0) {
/* not enough to read the id */
if (offset + 1 > size)
break;
id = data[offset] & 0x0f;
if (id == 15)
/* invalid id received - corrupt data */
goto invalid_id;
prec = (data[offset] & 0xf0) >> 4;
if (prec)
tab_size = 128;
else
tab_size = 64;
/* there is not enough for the table */
if (quant_size < tab_size + 1)
goto no_table;
GST_LOG ("read quant table %d, tab_size %d, prec %02x", id, tab_size, prec);
tables[id].size = tab_size;
tables[id].data = &data[offset + 1];
tab_size += 1;
quant_size -= tab_size;
offset += tab_size;
}
done:
return offset + quant_size;
/* ERRORS */
too_small:
{
GST_WARNING ("not enough data");
return size;
}
small_quant_size:
{
GST_WARNING ("quant_size too small (%u < 2)", quant_size);
return size;
}
invalid_id:
{
GST_WARNING ("invalid id");
goto done;
}
no_table:
{
GST_WARNING ("not enough data for table (%u < %u)", quant_size,
tab_size + 1);
goto done;
}
}
static gboolean
gst_rtp_jpeg_pay_read_sof (GstRtpJPEGPay * pay, const guint8 * data,
guint size, guint * offset, CompInfo info[], RtpQuantTable tables[],
gulong tables_elements)
{
guint sof_size, off;
guint width, height, infolen;
CompInfo elem;
gint i, j;
off = *offset;
/* we need at least 17 bytes for the SOF */
if (off + 17 > size)
goto wrong_size;
sof_size = gst_rtp_jpeg_pay_header_size (data, off);
if (sof_size < 17)
goto wrong_length;
*offset += sof_size;
/* skip size */
off += 2;
/* precision should be 8 */
if (data[off++] != 8)
goto bad_precision;
/* read dimensions */
height = data[off] << 8 | data[off + 1];
width = data[off + 2] << 8 | data[off + 3];
off += 4;
GST_LOG_OBJECT (pay, "got dimensions %ux%u", height, width);
if (height == 0) {
goto invalid_dimension;
}
if (height > 2040) {
height = 0;
}
if (width == 0) {
goto invalid_dimension;
}
if (width > 2040) {
width = 0;
}
if (height == 0 || width == 0) {
pay->height = 0;
pay->width = 0;
} else {
pay->height = GST_ROUND_UP_8 (height) / 8;
pay->width = GST_ROUND_UP_8 (width) / 8;
}
/* we only support 3 components */
if (data[off++] != 3)
goto bad_components;
infolen = 0;
for (i = 0; i < 3; i++) {
elem.id = data[off++];
elem.samp = data[off++];
elem.qt = data[off++];
GST_LOG_OBJECT (pay, "got comp %d, samp %02x, qt %d", elem.id, elem.samp,
elem.qt);
/* insertion sort from the last element to the first */
for (j = infolen; j > 1; j--) {
if (G_LIKELY (info[j - 1].id < elem.id))
break;
info[j] = info[j - 1];
}
info[j] = elem;
infolen++;
}
/* see that the components are supported */
if (info[0].samp == 0x21)
pay->type = 0;
else if (info[0].samp == 0x22)
pay->type = 1;
else
goto invalid_comp;
if (!(info[1].samp == 0x11))
goto invalid_comp;
if (!(info[2].samp == 0x11))
goto invalid_comp;
return TRUE;
/* ERRORS */
wrong_size:
{
GST_ELEMENT_WARNING (pay, STREAM, FORMAT,
("Wrong size %u (needed %u).", size, off + 17), (NULL));
return FALSE;
}
wrong_length:
{
GST_ELEMENT_WARNING (pay, STREAM, FORMAT,
("Wrong SOF length %u.", sof_size), (NULL));
return FALSE;
}
bad_precision:
{
GST_ELEMENT_WARNING (pay, STREAM, FORMAT,
("Wrong precision, expecting 8."), (NULL));
return FALSE;
}
invalid_dimension:
{
GST_ELEMENT_WARNING (pay, STREAM, FORMAT,
("Wrong dimension, size %ux%u", width, height), (NULL));
return FALSE;
}
bad_components:
{
GST_ELEMENT_WARNING (pay, STREAM, FORMAT,
("Wrong number of components"), (NULL));
return FALSE;
}
invalid_comp:
{
GST_ELEMENT_WARNING (pay, STREAM, FORMAT, ("Invalid component"), (NULL));
return FALSE;
}
}
static gboolean
gst_rtp_jpeg_pay_read_dri (GstRtpJPEGPay * pay, const guint8 * data,
guint size, guint * offset, RtpRestartMarkerHeader * dri)
{
guint dri_size, off;
off = *offset;
/* we need at least 4 bytes for the DRI */
if (off + 4 > size)
goto wrong_size;
dri_size = gst_rtp_jpeg_pay_header_size (data, off);
if (dri_size < 4)
goto wrong_length;
*offset += dri_size;
off += 2;
dri->restart_interval = g_htons ((data[off] << 8) | (data[off + 1]));
dri->restart_count = g_htons (0xFFFF);
return dri->restart_interval > 0;
wrong_size:
{
GST_WARNING ("not enough data for DRI");
*offset = size;
return FALSE;
}
wrong_length:
{
GST_WARNING ("DRI size too small (%u)", dri_size);
*offset += dri_size;
return FALSE;
}
}
static RtpJpegMarker
gst_rtp_jpeg_pay_scan_marker (const guint8 * data, guint size, guint * offset)
{
while ((data[(*offset)++] != JPEG_MARKER) && ((*offset) < size));
if (G_UNLIKELY ((*offset) >= size)) {
GST_LOG ("found EOI marker");
return JPEG_MARKER_EOI;
} else {
guint8 marker;
marker = data[*offset];
GST_LOG ("found 0x%02x marker at offset %u", marker, *offset);
(*offset)++;
return marker;
}
}
#define RTP_HEADER_LEN 12
static GstFlowReturn
gst_rtp_jpeg_pay_handle_buffer (GstRTPBasePayload * basepayload,
GstBuffer * buffer)
{
GstRtpJPEGPay *pay;
GstClockTime timestamp;
GstFlowReturn ret = GST_FLOW_ERROR;
RtpJpegHeader jpeg_header;
RtpQuantHeader quant_header;
RtpRestartMarkerHeader restart_marker_header;
RtpQuantTable tables[15] = { {0, NULL}, };
CompInfo info[3] = { {0,}, };
guint quant_data_size;
GstMapInfo map;
guint8 *data;
gsize size;
guint mtu, max_payload_size;
guint bytes_left;
guint jpeg_header_size = 0;
guint offset;
gboolean frame_done;
gboolean sos_found, sof_found, dqt_found, dri_found;
gint i;
GstBufferList *list = NULL;
gboolean discont;
pay = GST_RTP_JPEG_PAY (basepayload);
mtu = GST_RTP_BASE_PAYLOAD_MTU (pay);
gst_buffer_map (buffer, &map, GST_MAP_READ);
data = map.data;
size = map.size;
timestamp = GST_BUFFER_PTS (buffer);
offset = 0;
discont = GST_BUFFER_IS_DISCONT (buffer);
GST_LOG_OBJECT (pay, "got buffer size %" G_GSIZE_FORMAT
" , timestamp %" GST_TIME_FORMAT, size, GST_TIME_ARGS (timestamp));
/* parse the jpeg header for 'start of scan' and read quant tables if needed */
sos_found = FALSE;
dqt_found = FALSE;
sof_found = FALSE;
dri_found = FALSE;
while (!sos_found && (offset < size)) {
gint marker;
GST_LOG_OBJECT (pay, "checking from offset %u", offset);
switch ((marker = gst_rtp_jpeg_pay_scan_marker (data, size, &offset))) {
case JPEG_MARKER_JFIF:
case JPEG_MARKER_CMT:
case JPEG_MARKER_DHT:
case JPEG_MARKER_H264:
GST_LOG_OBJECT (pay, "skipping marker");
offset += gst_rtp_jpeg_pay_header_size (data, offset);
break;
case JPEG_MARKER_SOF:
if (!gst_rtp_jpeg_pay_read_sof (pay, data, size, &offset, info, tables,
G_N_ELEMENTS (tables)))
goto invalid_format;
sof_found = TRUE;
break;
case JPEG_MARKER_DQT:
GST_LOG ("DQT found");
offset = gst_rtp_jpeg_pay_read_quant_table (data, size, offset, tables);
dqt_found = TRUE;
break;
case JPEG_MARKER_SOS:
sos_found = TRUE;
GST_LOG_OBJECT (pay, "SOS found");
jpeg_header_size = offset + gst_rtp_jpeg_pay_header_size (data, offset);
break;
case JPEG_MARKER_EOI:
GST_WARNING_OBJECT (pay, "EOI reached before SOS!");
break;
case JPEG_MARKER_SOI:
GST_LOG_OBJECT (pay, "SOI found");
break;
case JPEG_MARKER_DRI:
GST_LOG_OBJECT (pay, "DRI found");
if (gst_rtp_jpeg_pay_read_dri (pay, data, size, &offset,
&restart_marker_header))
dri_found = TRUE;
break;
default:
if (marker == JPEG_MARKER_JPG ||
(marker >= JPEG_MARKER_JPG0 && marker <= JPEG_MARKER_JPG13) ||
(marker >= JPEG_MARKER_APP0 && marker <= JPEG_MARKER_APP15)) {
GST_LOG_OBJECT (pay, "skipping marker");
offset += gst_rtp_jpeg_pay_header_size (data, offset);
} else {
GST_FIXME_OBJECT (pay, "unhandled marker 0x%02x", marker);
}
break;
}
}
if (!dqt_found || !sof_found)
goto unsupported_jpeg;
/* by now we should either have negotiated the width/height or the SOF header
* should have filled us in */
if (pay->width < 0 || pay->height < 0) {
goto no_dimension;
}
GST_LOG_OBJECT (pay, "header size %u", jpeg_header_size);
size -= jpeg_header_size;
data += jpeg_header_size;
offset = 0;
if (dri_found)
pay->type += 64;
/* prepare stuff for the jpeg header */
jpeg_header.type_spec = 0;
jpeg_header.type = pay->type;
jpeg_header.q = pay->quant;
jpeg_header.width = pay->width;
jpeg_header.height = pay->height;
/* collect the quant headers sizes */
quant_header.mbz = 0;
quant_header.precision = 0;
quant_header.length = 0;
quant_data_size = 0;
if (pay->quant > 127) {
/* for the Y and U component, look up the quant table and its size. quant
* tables for U and V should be the same */
for (i = 0; i < 2; i++) {
guint qsize;
guint qt;
qt = info[i].qt;
if (qt >= G_N_ELEMENTS (tables))
goto invalid_quant;
qsize = tables[qt].size;
if (qsize == 0)
goto invalid_quant;
quant_header.precision |= (qsize == 64 ? 0 : (1 << i));
quant_data_size += qsize;
}
quant_header.length = g_htons (quant_data_size);
quant_data_size += sizeof (quant_header);
}
GST_LOG_OBJECT (pay, "quant_data size %u", quant_data_size);
bytes_left = sizeof (jpeg_header) + quant_data_size + size;
if (dri_found)
bytes_left += sizeof (restart_marker_header);
max_payload_size = mtu - (RTP_HEADER_LEN + sizeof (jpeg_header));
list = gst_buffer_list_new_sized ((bytes_left / max_payload_size) + 1);
frame_done = FALSE;
do {
GstBuffer *outbuf;
guint8 *payload;
guint payload_size;
guint header_size;
GstBuffer *paybuf;
GstRTPBuffer rtp = { NULL };
guint rtp_header_size = gst_rtp_buffer_calc_header_len (0);
/* The available room is the packet MTU, minus the RTP header length. */
payload_size =
(bytes_left < (mtu - rtp_header_size) ? bytes_left :
(mtu - rtp_header_size));
header_size = sizeof (jpeg_header) + quant_data_size;
if (dri_found)
header_size += sizeof (restart_marker_header);
outbuf = gst_rtp_buffer_new_allocate (header_size, 0, 0);
gst_rtp_buffer_map (outbuf, GST_MAP_WRITE, &rtp);
if (payload_size == bytes_left) {
GST_LOG_OBJECT (pay, "last packet of frame");
frame_done = TRUE;
gst_rtp_buffer_set_marker (&rtp, 1);
}
payload = gst_rtp_buffer_get_payload (&rtp);
/* update offset */
#if (G_BYTE_ORDER == G_LITTLE_ENDIAN)
jpeg_header.offset = ((offset & 0x0000FF) << 16) |
((offset & 0xFF0000) >> 16) | (offset & 0x00FF00);
#else
jpeg_header.offset = offset;
#endif
memcpy (payload, &jpeg_header, sizeof (jpeg_header));
payload += sizeof (jpeg_header);
payload_size -= sizeof (jpeg_header);
if (dri_found) {
memcpy (payload, &restart_marker_header, sizeof (restart_marker_header));
payload += sizeof (restart_marker_header);
payload_size -= sizeof (restart_marker_header);
}
/* only send quant table with first packet */
if (G_UNLIKELY (quant_data_size > 0)) {
memcpy (payload, &quant_header, sizeof (quant_header));
payload += sizeof (quant_header);
/* copy the quant tables for luma and chrominance */
for (i = 0; i < 2; i++) {
guint qsize;
guint qt;
qt = info[i].qt;
qsize = tables[qt].size;
memcpy (payload, tables[qt].data, qsize);
GST_LOG_OBJECT (pay, "component %d using quant %d, size %d", i, qt,
qsize);
payload += qsize;
}
payload_size -= quant_data_size;
bytes_left -= quant_data_size;
quant_data_size = 0;
}
GST_LOG_OBJECT (pay, "sending payload size %d", payload_size);
gst_rtp_buffer_unmap (&rtp);
/* create a new buf to hold the payload */
paybuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL,
jpeg_header_size + offset, payload_size);
/* join memory parts */
gst_rtp_copy_video_meta (pay, outbuf, paybuf);
outbuf = gst_buffer_append (outbuf, paybuf);
GST_BUFFER_PTS (outbuf) = timestamp;
if (discont) {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
/* Only the first outputted buffer has the DISCONT flag */
discont = FALSE;
}
/* and add to list */
gst_buffer_list_insert (list, -1, outbuf);
bytes_left -= payload_size;
offset += payload_size;
data += payload_size;
}
while (!frame_done);
/* push the whole buffer list at once */
ret = gst_rtp_base_payload_push_list (basepayload, list);
gst_buffer_unmap (buffer, &map);
gst_buffer_unref (buffer);
return ret;
/* ERRORS */
unsupported_jpeg:
{
GST_ELEMENT_WARNING (pay, STREAM, FORMAT, ("Unsupported JPEG"), (NULL));
gst_buffer_unmap (buffer, &map);
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
no_dimension:
{
GST_ELEMENT_WARNING (pay, STREAM, FORMAT, ("No size given"), (NULL));
gst_buffer_unmap (buffer, &map);
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
invalid_format:
{
/* error was posted */
gst_buffer_unmap (buffer, &map);
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
invalid_quant:
{
GST_ELEMENT_WARNING (pay, STREAM, FORMAT, ("Invalid quant tables"), (NULL));
gst_buffer_unmap (buffer, &map);
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
}
static void
gst_rtp_jpeg_pay_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstRtpJPEGPay *rtpjpegpay;
rtpjpegpay = GST_RTP_JPEG_PAY (object);
switch (prop_id) {
case PROP_JPEG_QUALITY:
rtpjpegpay->quality = g_value_get_int (value);
GST_DEBUG_OBJECT (object, "quality = %d", rtpjpegpay->quality);
break;
case PROP_JPEG_TYPE:
rtpjpegpay->type = g_value_get_int (value);
GST_DEBUG_OBJECT (object, "type = %d", rtpjpegpay->type);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_rtp_jpeg_pay_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstRtpJPEGPay *rtpjpegpay;
rtpjpegpay = GST_RTP_JPEG_PAY (object);
switch (prop_id) {
case PROP_JPEG_QUALITY:
g_value_set_int (value, rtpjpegpay->quality);
break;
case PROP_JPEG_TYPE:
g_value_set_int (value, rtpjpegpay->type);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
gboolean
gst_rtp_jpeg_pay_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "rtpjpegpay", GST_RANK_SECONDARY,
GST_TYPE_RTP_JPEG_PAY);
}
Reference in a new issue View git blame Copy permalink