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adpcmdec: decode adpcm without explicit length, as found in qt.

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This commit is contained in:
Michael Smith 2009-11-17 17:59:56 -08:00
parent 181786f8bf
commit dde31f09bd
1 changed files with 69 additions and 52 deletions
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107
gst/adpcmdec/adpcmdec.c
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@ -161,7 +161,8 @@ adpcmdec_sink_setcaps (GstPad * pad, GstCaps * caps)
return FALSE;
if (!gst_structure_get_int (structure, "block_align", &dec->blocksize))
return FALSE;
dec->blocksize = -1; /* Not provided */
if (!gst_structure_get_int (structure, "rate", &dec->rate))
return FALSE;
if (!gst_structure_get_int (structure, "channels", &dec->channels))
@ -381,17 +382,65 @@ adpcmdec_decode_ima_block (ADPCMDec * dec, int n_samples, guint8 * data,
return TRUE;
}
static GstFlowReturn
adpcmdec_decode_block (ADPCMDec * dec, guint8 * data, int blocksize)
{
gboolean res;
GstBuffer *outbuf = NULL;
int outsize;
int samples;
if (dec->layout == LAYOUT_ADPCM_MICROSOFT) {
/* Each block has a 3 byte header per channel, plus 4 bytes per channel to
give two initial sample values per channel. Then the remainder gives
two samples per byte */
if (blocksize < 7 * dec->channels)
return GST_FLOW_ERROR;
samples = (blocksize - 7 * dec->channels) * 2 + 2 * dec->channels;
outsize = 2 * samples;
outbuf = gst_buffer_new_and_alloc (outsize);
res = adpcmdec_decode_ms_block (dec, samples, data,
(gint16 *) (GST_BUFFER_DATA (outbuf)));
} else if (dec->layout == LAYOUT_ADPCM_DVI) {
/* Each block has a 4 byte header per channel, include an initial sample.
Then the remainder gives two samples per byte */
if (blocksize < 4 * dec->channels)
return GST_FLOW_ERROR;
samples = (blocksize - 4 * dec->channels) * 2 + dec->channels;
outsize = 2 * samples;
outbuf = gst_buffer_new_and_alloc (outsize);
res = adpcmdec_decode_ima_block (dec, samples, data,
(gint16 *) (GST_BUFFER_DATA (outbuf)));
} else {
GST_WARNING_OBJECT (dec, "Unknown layout");
return GST_FLOW_ERROR;
}
if (!res) {
gst_buffer_unref (outbuf);
GST_WARNING_OBJECT (dec, "Decode of block failed");
return GST_FLOW_ERROR;
}
gst_buffer_set_caps (outbuf, dec->output_caps);
GST_BUFFER_TIMESTAMP (outbuf) = dec->timestamp;
dec->out_samples += samples / dec->channels;
dec->timestamp = dec->base_timestamp +
gst_util_uint64_scale_int (dec->out_samples, GST_SECOND, dec->rate);
GST_BUFFER_DURATION (outbuf) = dec->timestamp - GST_BUFFER_TIMESTAMP (outbuf);
return gst_pad_push (dec->srcpad, outbuf);
}
static GstFlowReturn
adpcmdec_chain (GstPad * pad, GstBuffer * buf)
{
ADPCMDec *dec = (ADPCMDec *) gst_pad_get_parent (pad);
GstFlowReturn ret = GST_FLOW_OK;
guint8 *data;
GstBuffer *outbuf = NULL;
GstBuffer *databuf = NULL;
int outsize;
int samples;
gboolean res;
if (!dec->is_setup)
adpcmdec_setup (dec);
@ -403,59 +452,27 @@ adpcmdec_chain (GstPad * pad, GstBuffer * buf)
dec->timestamp = dec->base_timestamp;
}
if (dec->blocksize > 0) {
gst_adapter_push (dec->adapter, buf);
while (gst_adapter_available (dec->adapter) >= dec->blocksize) {
databuf = gst_adapter_take_buffer (dec->adapter, dec->blocksize);
data = GST_BUFFER_DATA (databuf);
if (dec->layout == LAYOUT_ADPCM_MICROSOFT) {
/* Each block has a 3 byte header per channel, plus 4 bytes per channel to
give two initial sample values per channel. Then the remainder gives
two samples per byte */
samples = (dec->blocksize - 7 * dec->channels) * 2 + 2 * dec->channels;
outsize = 2 * samples;
outbuf = gst_buffer_new_and_alloc (outsize);
res = adpcmdec_decode_ms_block (dec, samples, data,
(gint16 *) (GST_BUFFER_DATA (outbuf)));
} else if (dec->layout == LAYOUT_ADPCM_DVI) {
/* Each block has a 4 byte header per channel, include an initial sample.
Then the remainder gives two samples per byte */
samples = (dec->blocksize - 4 * dec->channels) * 2 + dec->channels;
outsize = 2 * samples;
outbuf = gst_buffer_new_and_alloc (outsize);
res = adpcmdec_decode_ima_block (dec, samples, data,
(gint16 *) (GST_BUFFER_DATA (outbuf)));
} else {
GST_WARNING_OBJECT (dec, "Unknown layout");
ret = GST_FLOW_ERROR;
goto done;
}
ret = adpcmdec_decode_block (dec, data, dec->blocksize);
/* Done with input data, free it */
gst_buffer_unref (databuf);
if (!res) {
gst_buffer_unref (outbuf);
GST_WARNING_OBJECT (dec, "Decode of block failed");
ret = GST_FLOW_ERROR;
goto done;
}
gst_buffer_set_caps (outbuf, dec->output_caps);
GST_BUFFER_TIMESTAMP (outbuf) = dec->timestamp;
dec->out_samples += samples / dec->channels;
dec->timestamp = dec->base_timestamp +
gst_util_uint64_scale_int (dec->out_samples, GST_SECOND, dec->rate);
GST_BUFFER_DURATION (outbuf) =
dec->timestamp - GST_BUFFER_TIMESTAMP (outbuf);
ret = gst_pad_push (dec->srcpad, outbuf);
if (ret != GST_FLOW_OK)
goto done;
}
} else {
/* No explicit blocksize; we just process one input buffer at a time */
ret = adpcmdec_decode_block (dec, GST_BUFFER_DATA (buf),
GST_BUFFER_SIZE (buf));
gst_buffer_unref (buf);
}
done:
gst_object_unref (dec);