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opusdec: handle missing buffers with no duration

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If buffer duration is missing, it is parsed from the packet data.
This is not foolproof, since Opus can change durations on the
fly.

https://bugzilla.gnome.org/show_bug.cgi?id=767826
This commit is contained in:
Vincent Penquerc'h 2016-06-20 12:42:28 +01:00
parent 72879c3639
commit 6bc6b6ebbf
2 changed files with 79 additions and 0 deletions
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77
ext/opus/gstopusdec.c
View file

@ -166,6 +166,7 @@ gst_opus_dec_reset (GstOpusDec * dec)
dec->sample_rate = 0;
dec->n_channels = 0;
dec->leftover_plc_duration = 0;
dec->last_known_buffer_duration = GST_CLOCK_TIME_NONE;
}
static void
@ -383,6 +384,66 @@ gst_opus_dec_parse_comments (GstOpusDec * dec, GstBuffer * buf)
return GST_FLOW_OK;
}
/* adapted from ext/ogg/gstoggstream.c */
static gint64
packet_duration_opus (const unsigned char *data, size_t bytes)
{
static const guint64 durations[32] = {
480, 960, 1920, 2880, /* Silk NB */
480, 960, 1920, 2880, /* Silk MB */
480, 960, 1920, 2880, /* Silk WB */
480, 960, /* Hybrid SWB */
480, 960, /* Hybrid FB */
120, 240, 480, 960, /* CELT NB */
120, 240, 480, 960, /* CELT NB */
120, 240, 480, 960, /* CELT NB */
120, 240, 480, 960, /* CELT NB */
};
gint64 duration;
gint64 frame_duration;
gint nframes = 0;
guint8 toc;
if (bytes < 1)
return 0;
/* headers */
if (bytes >= 8 && !memcmp (data, "Opus", 4))
return 0;
toc = data[0];
frame_duration = durations[toc >> 3];
switch (toc & 3) {
case 0:
nframes = 1;
break;
case 1:
nframes = 2;
break;
case 2:
nframes = 2;
break;
case 3:
if (bytes < 2) {
GST_WARNING ("Code 3 Opus packet has less than 2 bytes");
return 0;
}
nframes = data[1] & 63;
break;
}
duration = nframes * frame_duration;
if (duration > 5760) {
GST_WARNING ("Opus packet duration > 120 ms, invalid");
return 0;
}
GST_LOG ("Opus packet: frame size %.1f ms, %d frames, duration %.1f ms",
frame_duration / 48.f, nframes, duration / 48.f);
return duration / 48.f * 1000000;
}
static GstFlowReturn
opus_dec_chain_parse_data (GstOpusDec * dec, GstBuffer * buffer)
{
@ -479,6 +540,19 @@ opus_dec_chain_parse_data (GstOpusDec * dec, GstBuffer * buffer)
GstClockTime aligned_missing_duration;
GstClockTime missing_duration = GST_BUFFER_DURATION (bufd);
if (!GST_CLOCK_TIME_IS_VALID (missing_duration)) {
if (GST_CLOCK_TIME_IS_VALID (dec->last_known_buffer_duration)) {
missing_duration = dec->last_known_buffer_duration;
GST_WARNING_OBJECT (dec,
"Missing duration, using last duration %" GST_TIME_FORMAT,
GST_TIME_ARGS (missing_duration));
} else {
GST_WARNING_OBJECT (dec,
"Missing buffer, but unknown duration, and no previously known duration, assuming 20 ms");
missing_duration = 20 * GST_MSECOND;
}
}
GST_DEBUG_OBJECT (dec,
"missing buffer, doing PLC duration %" GST_TIME_FORMAT
" plus leftover %" GST_TIME_FORMAT, GST_TIME_ARGS (missing_duration),
@ -531,6 +605,9 @@ opus_dec_chain_parse_data (GstOpusDec * dec, GstBuffer * buffer)
goto buffer_failed;
}
if (size > 0)
dec->last_known_buffer_duration = packet_duration_opus (data, size);
gst_buffer_map (outbuf, &omap, GST_MAP_WRITE);
out_data = (gint16 *) omap.data;

2
ext/opus/gstopusdec.h
View file

@ -73,6 +73,8 @@ struct _GstOpusDec {
gboolean primed;
guint64 leftover_plc_duration;
GstClockTime last_known_buffer_duration;
};
struct _GstOpusDecClass {