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opusdec: allow negotiation of rate/channels with downstream

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Since an opus stream may be decoded to any (sensible) rate,
and either stereo or mono, we try to accomodate downstream.
This commit is contained in:
Vincent Penquerc'h 2011-11-16 13:26:35 +00:00
parent 70ca2a6851
commit 3c993f1c4a
1 changed files with 43 additions and 24 deletions
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67
ext/opus/gstopusdec.c
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@ -121,8 +121,8 @@ gst_opus_dec_reset (GstOpusDec * dec)
static void
gst_opus_dec_init (GstOpusDec * dec)
{
dec->sample_rate = 48000;
dec->n_channels = 2;
dec->sample_rate = 0;
dec->n_channels = 0;
gst_opus_dec_reset (dec);
}
@ -162,6 +162,46 @@ gst_opus_dec_parse_comments (GstOpusDec * dec, GstBuffer * buf)
return GST_FLOW_OK;
}
static void
gst_opus_dec_setup_from_peer_caps (GstOpusDec * dec)
{
GstPad *srcpad, *peer;
GstStructure *s;
GstCaps *caps, *template_caps, *peer_caps;
srcpad = GST_AUDIO_DECODER_SRC_PAD (dec);
peer = gst_pad_get_peer (srcpad);
if (peer) {
template_caps = gst_pad_get_pad_template_caps (srcpad);
peer_caps = gst_pad_get_caps (peer, NULL);
GST_DEBUG_OBJECT (dec, "Peer caps: %" GST_PTR_FORMAT, peer_caps);
caps = gst_caps_intersect (template_caps, peer_caps);
gst_caps_fixate (caps);
GST_DEBUG_OBJECT (dec, "Fixated caps: %" GST_PTR_FORMAT, caps);
s = gst_caps_get_structure (caps, 0);
if (!gst_structure_get_int (s, "channels", &dec->n_channels)) {
dec->n_channels = 2;
GST_WARNING_OBJECT (dec, "Failed to get channels, using default %d",
dec->n_channels);
} else {
GST_DEBUG_OBJECT (dec, "Got channels %d", dec->n_channels);
}
if (!gst_structure_get_int (s, "rate", &dec->sample_rate)) {
dec->sample_rate = 48000;
GST_WARNING_OBJECT (dec, "Failed to get rate, using default %d",
dec->sample_rate);
} else {
GST_DEBUG_OBJECT (dec, "Got sample rate %d", dec->sample_rate);
}
gst_audio_decoder_set_outcaps (GST_AUDIO_DECODER (dec), caps);
} else {
GST_WARNING_OBJECT (dec, "Failed to get src pad peer");
}
}
static GstFlowReturn
opus_dec_chain_parse_data (GstOpusDec * dec, GstBuffer * buf,
GstClockTime timestamp, GstClockTime duration)
@ -176,25 +216,11 @@ opus_dec_chain_parse_data (GstOpusDec * dec, GstBuffer * buf,
unsigned int packet_size;
if (dec->state == NULL) {
GstCaps *caps;
gst_opus_dec_setup_from_peer_caps (dec);
dec->state = opus_decoder_create (dec->sample_rate, dec->n_channels, &err);
if (!dec->state || err != OPUS_OK)
goto creation_failed;
/* set caps */
caps = gst_caps_new_simple ("audio/x-raw",
"format", G_TYPE_STRING, "S16LE",
"rate", G_TYPE_INT, dec->sample_rate,
"channels", G_TYPE_INT, dec->n_channels, NULL);
GST_DEBUG_OBJECT (dec, "rate=%d channels=%d",
dec->sample_rate, dec->n_channels);
if (!gst_pad_set_caps (GST_AUDIO_DECODER_SRC_PAD (dec), caps))
GST_ERROR ("nego failure");
gst_caps_unref (caps);
}
if (buf) {
@ -302,13 +328,6 @@ gst_opus_dec_set_format (GstAudioDecoder * bdec, GstCaps * caps)
}
}
caps = gst_caps_new_simple ("audio/x-raw",
"format", G_TYPE_STRING, "S16LE",
"rate", G_TYPE_INT, dec->sample_rate,
"channels", G_TYPE_INT, dec->n_channels, NULL);
gst_audio_decoder_set_outcaps (GST_AUDIO_DECODER (dec), caps);
gst_caps_unref (caps);
done:
return ret;
}