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Commits on Source (2)
/**
* @file pcm.c
* @brief Real-Time Protocol (RTP) linear and logarithmic audio
* @brief Real-Time Protocol (RTP) sample-based audio
* This files defines the same-based RTP payload formats (mostly from RFC3551)
* including linear, logarithmic and adaptive audio formats.
*/
/*****************************************************************************
* Copyright © 2021 Rémi Denis-Courmont
......@@ -132,6 +134,47 @@ static const struct vlc_rtp_pt_operations rtp_pcm_ops = {
rtp_pcm_release, rtp_pcm_init, rtp_pcm_destroy, rtp_pcm_decode,
};
static void *rtp_g722_init(struct vlc_rtp_pt *pt)
{
struct rtp_pcm *sys = pt->opaque;
es_format_t fmt;
es_format_Init(&fmt, AUDIO_ES, VLC_CODEC_ADPCM_G722);
/* For historical reasons, the RTP clock rate is 8000 Hz
* but the sampling rate really is 16000 Hz. */
fmt.audio.i_rate = 16000;
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 const struct vlc_rtp_pt_operations rtp_g722_ops = {
rtp_pcm_release, rtp_g722_init, rtp_pcm_destroy, rtp_pcm_decode,
};
static void *rtp_g726_init(struct vlc_rtp_pt *pt)
{
struct rtp_pcm *sys = pt->opaque;
es_format_t fmt;
es_format_Init(&fmt, AUDIO_ES, VLC_CODEC_ADPCM_G726);
fmt.audio.i_rate = 8000;
fmt.audio.i_physical_channels = sys->channel_mask;
fmt.audio.i_channels = sys->channel_count;
/* By VLC convention, the decoder knows the bit depth from the bit rate. */
fmt.i_bitrate = sys->sample_bits * sys->channel_count * 8000;
aout_FormatPrepare(&fmt.audio);
return vlc_rtp_pt_request_es(pt, &fmt);
}
static const struct vlc_rtp_pt_operations rtp_g726_ops = {
rtp_pcm_release, rtp_g726_init, rtp_pcm_destroy, rtp_pcm_decode,
};
static const uint32_t channel_masks[] = {
/* By default, there is only one channel. */
AOUT_CHAN_CENTER,
......@@ -164,6 +207,7 @@ static int rtp_pcm_open(vlc_object_t *obj, struct vlc_rtp_pt *pt,
{
vlc_fourcc_t fourcc;
unsigned bits;
const struct vlc_rtp_pt_operations *ops = &rtp_pcm_ops;
if (vlc_ascii_strcasecmp(desc->name, "L8") == 0) {
fourcc = VLC_CODEC_U8; /* RFC3551 §4.5.10 */
......@@ -189,6 +233,20 @@ static int rtp_pcm_open(vlc_object_t *obj, struct vlc_rtp_pt *pt,
fourcc = VLC_CODEC_MULAW; /* RFC3551 §4.5.14 */
bits = 8;
} else if (vlc_ascii_strcasecmp(desc->name, "G722") == 0) {
fourcc = VLC_CODEC_ADPCM_G726; /* RFC33551 §4.5.2 */
bits = 8;
ops = &rtp_g722_ops;
} else if (sscanf(desc->name, "G726-%u", &bits) == 1
|| sscanf(desc->name, "g726-%u", &bits) == 1) {
fourcc = VLC_CODEC_ADPCM_G726; /* RFC33551 §4.5.4 */
bits /= 8;
ops = &rtp_g726_ops;
if (unlikely(bits < 16 || bits % 8 || bits > 40))
return VLC_ENOTSUP;
} else if (vlc_ascii_strcasecmp(desc->name, "DAT12") == 0) {
fourcc = VLC_CODEC_DAT12; /* RFC3190 §3 */
bits = 12;
......@@ -227,7 +285,7 @@ static int rtp_pcm_open(vlc_object_t *obj, struct vlc_rtp_pt *pt,
}
pt->opaque = sys;
pt->ops = &rtp_pcm_ops;
pt->ops = ops;
return VLC_SUCCESS;
}
......@@ -238,5 +296,8 @@ vlc_module_begin()
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")
"audio/DAT12", "audio/PCMA", "audio/PCMU", "audio/G722",
"audio/G726-16", "audio/G726-24", "audio/G726-32",
"audio/G726-40")
/* TODO? DVI4, VDVI */
vlc_module_end()