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401 results
Show changes
Commits on Source (2)
......@@ -31,7 +31,10 @@ endif
# RTP payload parser plugins
rtpparsedir = $(accessdir)/rtp
rtpparse_LTLIBRARIES = \
librtp_mpeg12_plugin.la \
librtp_pcm_plugin.la
librtp_mpeg12_plugin_la_SOURCES = access/rtp/mpeg12.c
librtp_pcm_plugin_la_SOURCES = access/rtp/pcm.c
librtp_pcm_plugin_la_CPPFLAGS = $(AM_CPPFLAGS) -I$(srcdir)/access/rtp
/**
* @file mpeg12.c
* @brief Real-Time Protocol MPEG 1/2 payload format parser
*/
/*****************************************************************************
* Copyright © 2021 Rémi Denis-Courmont
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
****************************************************************************/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <assert.h>
#include <stdint.h>
#include <stdlib.h>
#include <vlc_common.h>
#include <vlc_block.h>
#include <vlc_es.h>
#include <vlc_plugin.h>
#include <vlc_strings.h>
#include "rtp.h"
struct rtp_mpa {
size_t offset;
struct vlc_rtp_es *es;
};
static void *rtp_mpa_init(struct vlc_rtp_pt *pt)
{
struct rtp_mpa *sys = malloc(sizeof (*sys));
if (unlikely(sys == NULL))
return NULL;
es_format_t fmt;
es_format_Init(&fmt, AUDIO_ES, VLC_CODEC_MPGA);
fmt.b_packetized = false;
sys->es = vlc_rtp_pt_request_es(pt, &fmt);
return sys;
}
static void rtp_mpa_destroy(struct vlc_rtp_pt *pt, void *data)
{
struct rtp_mpa *sys = data;
if (unlikely(sys == NULL))
return;
vlc_rtp_es_destroy(sys->es);
free(sys);
(void) pt;
}
static void rtp_mpa_decode(struct vlc_rtp_pt *pt, void *data, block_t *block)
{
struct vlc_logger *log = pt->opaque;
struct rtp_mpa *sys = data;
if (unlikely(sys == NULL))
goto drop;
if (block->i_buffer < 4) {
vlc_warning(log, "malformatted packet (%zu bytes)", block->i_buffer);
goto drop;
}
/* 2 bytes unused, 2 bytes fragment offset, then MPEG frame fragment */
uint_fast16_t offset = GetWBE(block->p_buffer + 2);
block->p_buffer += 4;
block->i_buffer -= 4;
if (offset != 0 && offset != sys->offset) {
/* Discontinuous offset, probably packet loss. */
vlc_warning(log, "offset discontinuity: expected %zu, got %"PRIuFAST16,
sys->offset, offset);
block->i_flags |= BLOCK_FLAG_DISCONTINUITY | BLOCK_FLAG_CORRUPTED;
}
sys->offset = offset + block->i_buffer;
/* This payload format does not flag the last fragment of a frame,
* so the MPGA header must be parsed to figure out the frame size and end
* (without introducing a one-packet delay).
* We let the packetiser handle it rather than duplicate the logic. */
vlc_rtp_es_send(sys->es, block);
return;
drop:
block_Release(block);
}
static const struct vlc_rtp_pt_operations rtp_mpa_ops = {
NULL, rtp_mpa_init, rtp_mpa_destroy, rtp_mpa_decode,
};
static int rtp_mpeg12_open(vlc_object_t *obj, struct vlc_rtp_pt *pt,
const struct vlc_sdp_pt *desc)
{
pt->opaque = vlc_object_logger(obj);
if (vlc_ascii_strcasecmp(desc->name, "MPA") == 0) /* RFC2250 */
pt->ops = &rtp_mpa_ops;
else
return VLC_ENOTSUP;
return VLC_SUCCESS;
}
vlc_module_begin()
set_shortname(N_("RTP MPEG"))
set_description(N_("RTP MPEG-1/2 payload parser"))
set_category(CAT_INPUT)
set_subcategory(SUBCAT_INPUT_DEMUX)
set_rtp_parser_callback(rtp_mpeg12_open)
add_shortcut("audio/MPA")
vlc_module_end()
......@@ -89,37 +89,6 @@ static const struct vlc_rtp_pt_operations rtp_audio_qcelp = {
NULL, qcelp_init, codec_destroy, codec_decode,
};
/* PT=14
* MPA: MPEG Audio (RFC2250, §3.4)
*/
static void *mpa_init(struct vlc_rtp_pt *pt)
{
es_format_t fmt;
es_format_Init (&fmt, AUDIO_ES, VLC_CODEC_MPGA);
fmt.b_packetized = false;
return vlc_rtp_pt_request_es(pt, &fmt);
}
static void mpa_decode(struct vlc_rtp_pt *pt, void *data, block_t *block)
{
if (block->i_buffer < 4)
{
block_Release (block);
return;
}
block->i_buffer -= 4; /* 32-bits RTP/MPA header */
block->p_buffer += 4;
block->i_dts = VLC_TICK_INVALID;
vlc_rtp_es_send(data, block);
(void) pt;
}
static const struct vlc_rtp_pt_operations rtp_audio_mpa = {
NULL, mpa_init, codec_destroy, mpa_decode,
};
/* PT=32
* MPV: MPEG Video (RFC2250, §3.5)
*/
......@@ -218,8 +187,6 @@ static struct vlc_rtp_pt *vlc_rtp_pt_create(vlc_object_t *obj,
pt->ops = &rtp_audio_gsm;
else if (strcmp(desc->name, "QCELP") == 0)
pt->ops = &rtp_audio_qcelp;
else if (strcmp(desc->name, "MPA") == 0)
pt->ops = &rtp_audio_mpa;
} else if (strcmp(desc->media->type, "video") == 0) {
if (strcmp(desc->name, "MPV") == 0)
pt->ops = &rtp_video_mpv;
......