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403 results
Show changes
Commits on Source (2)
......@@ -27,3 +27,11 @@ librtp_plugin_la_CFLAGS += $(GCRYPT_CFLAGS)
librtp_plugin_la_LIBADD += libvlc_srtp.la $(GCRYPT_LIBS)
librtp_plugin_la_DEPENDENCIES += libvlc_srtp.la
endif
# RTP payload parser plugins
rtpparsedir = $(accessdir)/rtp
rtpparse_LTLIBRARIES = \
librtp_pcm_plugin.la
librtp_pcm_plugin_la_SOURCES = access/rtp/pcm.c
librtp_pcm_plugin_la_CPPFLAGS = $(AM_CPPFLAGS) -I$(srcdir)/access/rtp
/**
* @file pcm.c
* @brief Real-Time Protocol (RTP) linear and logarithmic audio
*/
/*****************************************************************************
* 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_aout.h>
#include <vlc_block.h>
#include <vlc_es.h>
#include <vlc_plugin.h>
#include <vlc_strings.h>
#include "rtp.h"
#define RTP_MAX_CHANS 6
struct rtp_pcm {
vlc_fourcc_t fourcc;
uint16_t channel_mask;
uint8_t sample_bits;
uint8_t channel_count;
bool channel_reorder;
uint8_t channel_map[RTP_MAX_CHANS];
};
static void *rtp_pcm_init(struct vlc_rtp_pt *pt)
{
struct rtp_pcm *sys = pt->opaque;
es_format_t fmt;
es_format_Init(&fmt, AUDIO_ES, sys->fourcc);
fmt.audio.i_rate = pt->frequency;
fmt.audio.i_physical_channels = sys->channel_mask;
fmt.audio.i_channels = sys->channel_count;
aout_FormatPrepare(&fmt.audio);
return vlc_rtp_pt_request_es(pt, &fmt);
}
static void rtp_pcm_destroy(struct vlc_rtp_pt *pt, void *data)
{
struct vlc_rtp_es *es = data;
vlc_rtp_es_destroy(es);
(void) pt;
}
static void rtp_pcm_reorder(void *restrict out, const void *restrict in,
size_t frames, size_t sample_size,
size_t channels, const uint8_t *restrict map)
{
unsigned char *outp = out;
const unsigned char *inp = in;
const size_t frame_size = sample_size * channels;
if (sample_size == 0 || sample_size > 3)
vlc_assert_unreachable(); /* Let compiler optimise the memcpy(). */
for (size_t i = 0; i < frames; i++) {
for (size_t j = 0; j < channels; j++) {
memcpy(outp + (sample_size * map[j]), inp, sample_size);
inp += sample_size;
}
outp += frame_size;
}
}
static void rtp_pcm_decode(struct vlc_rtp_pt *pt, void *data, block_t *block)
{
struct rtp_pcm *sys = pt->opaque;
struct vlc_rtp_es *es = data;
const size_t frame_bits = sys->channel_count * sys->sample_bits;
size_t frames = (8 * block->i_buffer) / frame_bits;
block->i_buffer = ((frames * frame_bits) + 7) / 8;
block->i_dts = VLC_TICK_INVALID;
if (sys->channel_reorder) {
block_t *reordered = block_Alloc(block->i_buffer);
assert((sys->sample_bits % 8) == 0);
if (likely(reordered != NULL)) {
block_CopyProperties(reordered, block);
rtp_pcm_reorder(reordered->p_buffer, block->p_buffer, frames,
sys->sample_bits / 8, sys->channel_count,
sys->channel_map);
}
block_Release(block);
block = reordered;
if (unlikely(block == NULL))
return;
}
vlc_rtp_es_send(es, block);
}
static void rtp_pcm_release(struct vlc_rtp_pt *pt)
{
struct rtp_pcm *sys = pt->opaque;
free(sys);
}
static const struct vlc_rtp_pt_operations rtp_pcm_ops = {
rtp_pcm_release, rtp_pcm_init, rtp_pcm_destroy, rtp_pcm_decode,
};
static const uint32_t channel_masks[] = {
/* By default, there is only one channel. */
AOUT_CHAN_CENTER,
/*
* RTP/AVP recommends AIFF-C channel order by default (RFC3551 §4.1).
* For 1-4 channel(s), this works well.
*/
AOUT_CHAN_CENTER, AOUT_CHANS_2_0, AOUT_CHANS_3_0, AOUT_CHANS_3_1,
/* AIFF-C says for 5 channels, and RFC says 3.2. We assume normal 5.0. */
AOUT_CHANS_5_0,
/* Accordingly for 6 channels, we assume normal 5.1 instead of AIFF-C's. */
AOUT_CHANS_5_1,
};
static const uint32_t channel_order[] = {
AOUT_CHAN_LEFT, AOUT_CHAN_REARLEFT, AOUT_CHAN_CENTER,
AOUT_CHAN_RIGHT, AOUT_CHAN_REARRIGHT, AOUT_CHAN_LFE, 0,
};
/* RTP puts right before center for 3.0, but center before right for 3.1! */
static const uint32_t channel_order_3[RTP_MAX_CHANS] = {
AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT, AOUT_CHAN_CENTER,
};
static_assert (ARRAY_SIZE(channel_masks) == RTP_MAX_CHANS + 1, "Bad masks");
static_assert (ARRAY_SIZE(channel_order) == RTP_MAX_CHANS + 1, "Bad order");
static int rtp_pcm_open(vlc_object_t *obj, struct vlc_rtp_pt *pt,
const struct vlc_sdp_pt *desc)
{
vlc_fourcc_t fourcc;
unsigned bits;
if (vlc_ascii_strcasecmp(desc->name, "L8") == 0) {
fourcc = VLC_CODEC_U8; /* RFC3551 §4.5.10 */
bits = 8;
} else if (vlc_ascii_strcasecmp(desc->name, "L16") == 0) {
fourcc = VLC_CODEC_S16B; /* RFC3551 §4.5.11 */
bits = 16;
} else if (vlc_ascii_strcasecmp(desc->name, "L20") == 0) {
fourcc = VLC_CODEC_S20B; /* RFC3190 §4 */
bits = 20;
} else if (vlc_ascii_strcasecmp(desc->name, "L24") == 0) {
fourcc = VLC_CODEC_S24B; /* RFC3190 §4 */
bits = 24;
} else if (vlc_ascii_strcasecmp(desc->name, "PCMA") == 0) {
fourcc = VLC_CODEC_ALAW; /* RFC3551 §4.5.14 */
bits = 8;
} else if (vlc_ascii_strcasecmp(desc->name, "PCMU") == 0) {
fourcc = VLC_CODEC_MULAW; /* RFC3551 §4.5.14 */
bits = 8;
} else if (vlc_ascii_strcasecmp(desc->name, "DAT12") == 0) {
fourcc = VLC_CODEC_DAT12; /* RFC3190 §3 */
bits = 12;
} else
return VLC_ENOTSUP;
struct rtp_pcm *sys = malloc(sizeof (*sys));
if (unlikely(sys == NULL))
return VLC_ENOMEM;
sys->fourcc = fourcc;
sys->channel_count = desc->channel_count ? desc->channel_count : 1;
sys->channel_reorder = false;
sys->sample_bits = bits;
if (desc->channel_count < ARRAY_SIZE(channel_masks)) {
sys->channel_mask = channel_masks[desc->channel_count];
assert(vlc_popcount(sys->channel_mask) == sys->channel_count);
/* Octet-unaligned formats cannot readily be reordered, especially in
* foreign endianness. The decoder will take care of that. */
if ((bits % 8) == 0) {
const uint32_t *order = channel_order;
if (desc->channel_count == 3)
order = channel_order_3;
if (aout_CheckChannelReorder(order, NULL, sys->channel_mask,
sys->channel_map))
sys->channel_reorder = true;
}
} else {
msg_Warn(obj, "unknown %hhu-channels layout", desc->channel_count);
sys->channel_mask = 0;
}
pt->opaque = sys;
pt->ops = &rtp_pcm_ops;
return VLC_SUCCESS;
}
vlc_module_begin()
set_shortname(N_("RTP PCM"))
set_description(N_("RTP PCM payload parser"))
set_category(CAT_INPUT)
set_subcategory(SUBCAT_INPUT_DEMUX)
set_rtp_parser_callback(rtp_pcm_open)
add_shortcut("audio/L8", "audio/L16", "audio/L20", "audio/L24",
"audio/DAT12", "audio/PCMA", "audio/PCMU")
vlc_module_end()
......@@ -55,23 +55,6 @@ static void codec_decode(struct vlc_rtp_pt *pt, void *data, block_t *block)
* Static payload types handler
*/
/* PT=0
* PCMU: G.711 µ-law (RFC3551)
*/
static void *pcmu_init(struct vlc_rtp_pt *pt)
{
es_format_t fmt;
es_format_Init (&fmt, AUDIO_ES, VLC_CODEC_MULAW);
fmt.audio.i_rate = pt->frequency;
fmt.audio.i_channels = pt->channel_count ? pt->channel_count : 1;
return vlc_rtp_pt_request_es(pt, &fmt);
}
static const struct vlc_rtp_pt_operations rtp_audio_pcmu = {
NULL, pcmu_init, codec_destroy, codec_decode,
};
/* PT=3
* GSM
*/
......@@ -89,40 +72,6 @@ static const struct vlc_rtp_pt_operations rtp_audio_gsm = {
NULL, gsm_init, codec_destroy, codec_decode,
};
/* PT=8
* PCMA: G.711 A-law (RFC3551)
*/
static void *pcma_init(struct vlc_rtp_pt *pt)
{
es_format_t fmt;
es_format_Init (&fmt, AUDIO_ES, VLC_CODEC_ALAW);
fmt.audio.i_rate = pt->frequency;
fmt.audio.i_channels = pt->channel_count ? pt->channel_count : 1;
return vlc_rtp_pt_request_es(pt, &fmt);
}
static const struct vlc_rtp_pt_operations rtp_audio_pcma = {
NULL, pcma_init, codec_destroy, codec_decode,
};
/* PT=10,11
* L16: 16-bits (network byte order) PCM
*/
static void *l16_init(struct vlc_rtp_pt *pt)
{
es_format_t fmt;
es_format_Init (&fmt, AUDIO_ES, VLC_CODEC_S16B);
fmt.audio.i_rate = pt->frequency;
fmt.audio.i_channels = pt->channel_count ? pt->channel_count : 1;
return vlc_rtp_pt_request_es(pt, &fmt);
}
static const struct vlc_rtp_pt_operations rtp_audio_l16 = {
NULL, l16_init, codec_destroy, codec_decode,
};
/* PT=12
* QCELP
*/
......@@ -265,14 +214,8 @@ static struct vlc_rtp_pt *vlc_rtp_pt_create(vlc_object_t *obj,
pt->ops = NULL;
if (strcmp(desc->media->type, "audio") == 0) {
if (strcmp(desc->name, "PCMU") == 0)
pt->ops = &rtp_audio_pcmu;
else if (strcmp(desc->name, "GSM") == 0)
if (strcmp(desc->name, "GSM") == 0)
pt->ops = &rtp_audio_gsm;
else if (strcmp(desc->name, "PCMA") == 0)
pt->ops = &rtp_audio_pcma;
else if (strcmp(desc->name, "L16") == 0)
pt->ops = &rtp_audio_l16;
else if (strcmp(desc->name, "QCELP") == 0)
pt->ops = &rtp_audio_qcelp;
else if (strcmp(desc->name, "MPA") == 0)
......