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aacparse: Skip LOAS AAC until a valid config is seen.

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It's normal when dropping into the middle of a stream to
not always have the config available immediately, so skip LOAS
until a valid config is seen without either setting invalid
caps or erroring out.

https://bugzilla.gnome.org/show_bug.cgi?id=751386
This commit is contained in:
Jan Schmidt 2015-09-16 07:05:36 +10:00
parent b7b244f356
commit c919548e2c
1 changed files with 18 additions and 8 deletions

26
gst/audioparsers/gstaacparse.c

@ -581,9 +581,11 @@ gst_aac_parse_read_loas_config (GstAacParse * aacparse, const guint8 * data,
if (!gst_bit_reader_get_bits_uint8 (&br, &u8, 1)) if (!gst_bit_reader_get_bits_uint8 (&br, &u8, 1))
return FALSE; return FALSE;
if (u8) { if (u8) {
GST_DEBUG_OBJECT (aacparse, "Frame uses previous config"); GST_LOG_OBJECT (aacparse, "Frame uses previous config");
if (!aacparse->sample_rate || !aacparse->channels) { if (!aacparse->sample_rate || !aacparse->channels) {
GST_WARNING_OBJECT (aacparse, "No previous config to use"); GST_DEBUG_OBJECT (aacparse,
"No previous config to use. We'll look for more data.");
return FALSE;
} }
*sample_rate = aacparse->sample_rate; *sample_rate = aacparse->sample_rate;
*channels = aacparse->channels; *channels = aacparse->channels;
@ -876,7 +878,9 @@ gst_aac_parse_detect_stream (GstAacParse * aacparse,
if (!gst_aac_parse_read_loas_config (aacparse, data, avail, &rate, if (!gst_aac_parse_read_loas_config (aacparse, data, avail, &rate,
&channels, &aacparse->mpegversion)) { &channels, &aacparse->mpegversion)) {
GST_WARNING_OBJECT (aacparse, "Error reading LOAS config"); /* This is pretty normal when skipping data at the start of
* random stream (MPEG-TS capture for example) */
GST_LOG_OBJECT (aacparse, "Error reading LOAS config");
return FALSE; return FALSE;
} }
@ -884,10 +888,10 @@ gst_aac_parse_detect_stream (GstAacParse * aacparse,
gst_base_parse_set_frame_rate (GST_BASE_PARSE (aacparse), rate, gst_base_parse_set_frame_rate (GST_BASE_PARSE (aacparse), rate,
aacparse->frame_samples, 2, 2); aacparse->frame_samples, 2, 2);
/* Don't store the sample rate and channels yet -
* this is just format detection. */
GST_DEBUG ("LOAS: samplerate %d, channels %d, objtype %d, version %d", GST_DEBUG ("LOAS: samplerate %d, channels %d, objtype %d, version %d",
rate, channels, aacparse->object_type, aacparse->mpegversion); rate, channels, aacparse->object_type, aacparse->mpegversion);
aacparse->sample_rate = rate;
aacparse->channels = channels;
} }
gst_base_parse_set_syncable (GST_BASE_PARSE (aacparse), TRUE); gst_base_parse_set_syncable (GST_BASE_PARSE (aacparse), TRUE);
@ -1293,9 +1297,15 @@ gst_aac_parse_handle_frame (GstBaseParse * parse,
frame->overhead = 3; frame->overhead = 3;
if (!gst_aac_parse_read_loas_config (aacparse, map.data, map.size, &rate, if (!gst_aac_parse_read_loas_config (aacparse, map.data, map.size, &rate,
&channels, NULL)) { &channels, NULL) || !rate || !channels) {
GST_WARNING_OBJECT (aacparse, "Error reading LOAS config"); /* This is pretty normal when skipping data at the start of
} else if (G_UNLIKELY (rate != aacparse->sample_rate * random stream (MPEG-TS capture for example) */
GST_DEBUG_OBJECT (aacparse, "Error reading LOAS config. Skipping.");
*skipsize = map.size;
goto exit;
}
if (G_UNLIKELY (rate != aacparse->sample_rate
|| channels != aacparse->channels)) { || channels != aacparse->channels)) {
aacparse->sample_rate = rate; aacparse->sample_rate = rate;
aacparse->channels = channels; aacparse->channels = channels;