gstreamer/gst/mpegtsmux/mpegtsmux_h264.c
2011-05-18 12:06:38 -07:00

293 lines
10 KiB
C

/*
* Copyright 2006, 2007, 2008, 2009, 2010 Fluendo S.A.
* Authors: Jan Schmidt <jan@fluendo.com>
* Kapil Agrawal <kapil@fluendo.com>
* Julien Moutte <julien@fluendo.com>
*
* This library is licensed under 4 different licenses and you
* can choose to use it under the terms of any one of them. The
* four licenses are the MPL 1.1, the LGPL, the GPL and the MIT
* license.
*
* MPL:
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
* License for the specific language governing rights and limitations
* under the License.
*
* LGPL:
*
* 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.
*
* GPL:
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* MIT:
*
* Unless otherwise indicated, Source Code is licensed under MIT license.
* See further explanation attached in License Statement (distributed in the file
* LICENSE).
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do
* so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "mpegtsmux_h264.h"
#include <string.h>
#define GST_CAT_DEFAULT mpegtsmux_debug
#define SPS_PPS_PERIOD GST_SECOND
typedef struct PrivDataH264 PrivDataH264;
struct PrivDataH264
{
GstBuffer *last_codec_data;
GstClockTime last_resync_ts;
GstBuffer *cached_es;
guint8 nal_length_size;
};
void
mpegtsmux_free_h264 (gpointer prepare_data)
{
PrivDataH264 *h264_data = (PrivDataH264 *) prepare_data;
if (h264_data->cached_es) {
gst_buffer_unref (h264_data->cached_es);
h264_data->cached_es = NULL;
}
g_free (prepare_data);
}
static inline gboolean
mpegtsmux_process_codec_data_h264 (MpegTsPadData * data, MpegTsMux * mux)
{
PrivDataH264 *h264_data;
gboolean ret = FALSE;
/* Initialize our private data structure for caching */
if (G_UNLIKELY (!data->prepare_data)) {
data->prepare_data = g_new0 (PrivDataH264, 1);
h264_data = (PrivDataH264 *) data->prepare_data;
h264_data->last_resync_ts = GST_CLOCK_TIME_NONE;
}
h264_data = (PrivDataH264 *) data->prepare_data;
/* Detect a codec data change */
if (h264_data->last_codec_data != data->codec_data) {
if (h264_data->cached_es) {
gst_buffer_unref (h264_data->cached_es);
h264_data->cached_es = NULL;
}
ret = TRUE;
}
/* Generate the SPS/PPS ES header that will be prepended regularly */
if (G_UNLIKELY (!h264_data->cached_es)) {
gint offset = 4, i = 0, nb_sps = 0, nb_pps = 0;
gsize out_offset = 0;
guint8 startcode[4] = { 0x00, 0x00, 0x00, 0x01 };
h264_data->last_codec_data = data->codec_data;
h264_data->cached_es =
gst_buffer_new_and_alloc (GST_BUFFER_SIZE (data->codec_data) * 10);
/* Get NAL length size */
h264_data->nal_length_size =
(GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data) + offset) & 0x03) +
1;
GST_LOG_OBJECT (mux, "NAL length will be coded on %u bytes",
h264_data->nal_length_size);
offset++;
/* How many SPS */
nb_sps =
GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data) + offset) & 0x1f;
GST_DEBUG_OBJECT (mux, "we have %d Sequence Parameter Set", nb_sps);
offset++;
/* For each SPS */
for (i = 0; i < nb_sps; i++) {
guint16 sps_size =
GST_READ_UINT16_BE (GST_BUFFER_DATA (data->codec_data) + offset);
GST_LOG_OBJECT (mux, "Sequence Parameter Set is %d bytes", sps_size);
/* Jump over SPS size */
offset += 2;
/* Fake a start code */
memcpy (GST_BUFFER_DATA (h264_data->cached_es) + out_offset,
startcode, 4);
out_offset += 4;
/* Now push the SPS */
memcpy (GST_BUFFER_DATA (h264_data->cached_es) + out_offset,
GST_BUFFER_DATA (data->codec_data) + offset, sps_size);
out_offset += sps_size;
offset += sps_size;
}
/* How many PPS */
nb_pps = GST_READ_UINT8 (GST_BUFFER_DATA (data->codec_data) + offset);
GST_LOG_OBJECT (mux, "we have %d Picture Parameter Set", nb_sps);
offset++;
/* For each PPS */
for (i = 0; i < nb_pps; i++) {
gint pps_size =
GST_READ_UINT16_BE (GST_BUFFER_DATA (data->codec_data) + offset);
GST_LOG_OBJECT (mux, "Picture Parameter Set is %d bytes", pps_size);
/* Jump over PPS size */
offset += 2;
/* Fake a start code */
memcpy (GST_BUFFER_DATA (h264_data->cached_es) + out_offset,
startcode, 4);
out_offset += 4;
/* Now push the PPS */
memcpy (GST_BUFFER_DATA (h264_data->cached_es) + out_offset,
GST_BUFFER_DATA (data->codec_data) + offset, pps_size);
out_offset += pps_size;
offset += pps_size;
}
GST_BUFFER_SIZE (h264_data->cached_es) = out_offset;
GST_DEBUG_OBJECT (mux, "generated a %" G_GSIZE_FORMAT
" bytes SPS/PPS header", out_offset);
}
return ret;
}
GstBuffer *
mpegtsmux_prepare_h264 (GstBuffer * buf, MpegTsPadData * data, MpegTsMux * mux)
{
guint8 startcode[4] = { 0x00, 0x00, 0x00, 0x01 };
gsize out_offset = 0, in_offset = 0;
GstBuffer *out_buf;
gboolean changed;
PrivDataH264 *h264_data;
GstClockTimeDiff diff = GST_CLOCK_TIME_NONE;
GST_DEBUG_OBJECT (mux, "Preparing H264 buffer for output");
changed = mpegtsmux_process_codec_data_h264 (data, mux);
h264_data = (PrivDataH264 *) data->prepare_data;
if (GST_CLOCK_TIME_IS_VALID (h264_data->last_resync_ts) &&
GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (buf))) {
diff = GST_CLOCK_DIFF (h264_data->last_resync_ts,
GST_BUFFER_TIMESTAMP (buf));
}
if (changed || (GST_CLOCK_TIME_IS_VALID (diff) && diff > SPS_PPS_PERIOD)) {
out_buf = gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buf) * 2 +
GST_BUFFER_SIZE (h264_data->cached_es));
h264_data->last_resync_ts = GST_BUFFER_TIMESTAMP (buf);
memcpy (GST_BUFFER_DATA (out_buf), GST_BUFFER_DATA (h264_data->cached_es),
GST_BUFFER_SIZE (h264_data->cached_es));
out_offset = GST_BUFFER_SIZE (h264_data->cached_es);
GST_DEBUG_OBJECT (mux, "prepending SPS/PPS information to that packet");
} else {
out_buf = gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buf) * 2);
}
/* We want the same metadata */
gst_buffer_copy_metadata (out_buf, buf, GST_BUFFER_COPY_ALL);
while (in_offset < GST_BUFFER_SIZE (buf) &&
out_offset < GST_BUFFER_SIZE (out_buf) - 4) {
guint32 nal_size = 0;
switch (h264_data->nal_length_size) {
case 1:
nal_size = GST_READ_UINT8 (GST_BUFFER_DATA (buf) + in_offset);
break;
case 2:
nal_size = GST_READ_UINT16_BE (GST_BUFFER_DATA (buf) + in_offset);
break;
case 4:
nal_size = GST_READ_UINT32_BE (GST_BUFFER_DATA (buf) + in_offset);
break;
default:
GST_WARNING_OBJECT (mux, "unsupported NAL length size %u",
h264_data->nal_length_size);
}
in_offset += h264_data->nal_length_size;
/* Generate an Elementary stream buffer by inserting a startcode */
memcpy (GST_BUFFER_DATA (out_buf) + out_offset, startcode, 4);
out_offset += 4;
memcpy (GST_BUFFER_DATA (out_buf) + out_offset,
GST_BUFFER_DATA (buf) + in_offset,
MIN (nal_size, GST_BUFFER_SIZE (out_buf) - out_offset));
in_offset += nal_size;
out_offset += nal_size;
}
if (out_offset > GST_BUFFER_SIZE (out_buf)) {
GST_WARNING_OBJECT (mux, "Calculated buffer size %" G_GSIZE_FORMAT
" is greater than max expected size %u, "
"using max expected size (Input might not be in "
"avc format", out_offset, GST_BUFFER_SIZE (out_buf));
out_offset = GST_BUFFER_SIZE (out_buf);
}
GST_BUFFER_SIZE (out_buf) = out_offset;
return out_buf;
}