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gsmdec: process all available input frames in one go

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Instead of parsing, decoding and sending out
lots os little 20ms audio buffers one by one.
This commit is contained in:
Tim-Philipp Müller 2013-12-12 13:21:15 +00:00
parent de60453a33
commit b3910cabaf
1 changed files with 58 additions and 13 deletions
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65
ext/gsm/gstgsmdec.c
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@ -190,6 +190,17 @@ gst_gsmdec_parse (GstAudioDecoder * dec, GstAdapter * adapter,
guint size;
size = gst_adapter_available (adapter);
/* if input format is TIME each buffer should be self-contained and
* the data is presumably packetised, and we should start with a clean
* slate/state at the beginning of each buffer (for wav49 case) */
if (dec->input_segment.format == GST_FORMAT_TIME) {
*offset = 0;
*length = size;
gsmdec->needed = 33;
return GST_FLOW_OK;
}
g_return_val_if_fail (size > 0, GST_FLOW_ERROR);
if (size < gsmdec->needed)
@ -206,14 +217,33 @@ gst_gsmdec_parse (GstAudioDecoder * dec, GstAdapter * adapter,
return GST_FLOW_OK;
}
static guint
gst_gsmdec_get_frame_count (GstGSMDec * dec, gsize buffer_size)
{
guint count;
if (dec->use_wav49) {
count = (buffer_size / (33 + 32)) * 2;
if (buffer_size % (33 + 32) >= dec->needed)
++count;
} else {
count = buffer_size / 33;
}
return count;
}
static GstFlowReturn
gst_gsmdec_handle_frame (GstAudioDecoder * dec, GstBuffer * buffer)
{
GstGSMDec *gsmdec;
gsm_signal *out_data;
gsm_byte *data;
GstFlowReturn ret = GST_FLOW_OK;
GstBuffer *outbuf;
GstMapInfo map, omap;
gsize outsize;
guint frames, i, errors = 0;
/* no fancy draining */
if (G_UNLIKELY (!buffer))
@ -221,26 +251,41 @@ gst_gsmdec_handle_frame (GstAudioDecoder * dec, GstBuffer * buffer)
gsmdec = GST_GSMDEC (dec);
/* always the same amount of output samples */
outbuf = gst_buffer_new_and_alloc (ENCODED_SAMPLES * sizeof (gsm_signal));
/* now encode frame into the output buffer */
gst_buffer_map (buffer, &map, GST_MAP_READ);
frames = gst_gsmdec_get_frame_count (gsmdec, map.size);
/* always the same amount of output samples (20ms worth per frame) */
outsize = ENCODED_SAMPLES * frames * sizeof (gsm_signal);
outbuf = gst_buffer_new_and_alloc (outsize);
gst_buffer_map (outbuf, &omap, GST_MAP_WRITE);
out_data = (gsm_signal *) omap.data;
data = (gsm_byte *) map.data;
if (gsm_decode (gsmdec->state, data, (gsm_signal *) omap.data) < 0) {
for (i = 0; i < frames; ++i) {
/* now encode frame into the output buffer */
if (gsm_decode (gsmdec->state, data, out_data) < 0) {
/* invalid frame */
GST_AUDIO_DECODER_ERROR (gsmdec, 1, STREAM, DECODE, (NULL),
("tried to decode an invalid frame"), ret);
gst_buffer_unmap (outbuf, &omap);
gst_buffer_unref (outbuf);
outbuf = NULL;
} else {
gst_buffer_unmap (outbuf, &omap);
memset (out_data, 0, ENCODED_SAMPLES * sizeof (gsm_signal));
++errors;
}
out_data += ENCODED_SAMPLES;
data += gsmdec->needed;
if (gsmdec->use_wav49)
gsmdec->needed = (gsmdec->needed == 33 ? 32 : 33);
}
gst_buffer_unmap (outbuf, &omap);
gst_buffer_unmap (buffer, &map);
if (errors == frames) {
gst_buffer_unref (outbuf);
outbuf = NULL;
}
gst_audio_decoder_finish_frame (dec, outbuf, 1);
return ret;