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wavparse: emit midi-base-note tag from data in 'smpl' chunk

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Add parsing of the 'smpl' chunk. Right now we only grab the midi-base-note and
emit it as a tag.
This commit is contained in:
Stefan Sauer 2013-12-30 14:36:45 +01:00
parent 5ddf6a5e32
commit 2e277bb341
1 changed files with 81 additions and 0 deletions
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81
gst/wavparse/gstwavparse.c
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@ -1253,6 +1253,42 @@ gst_wavparse_note_chunk (GstWavParse * wav, const guint8 * data, guint32 size)
return TRUE;
}
/*
* gst_wavparse_smpl_chunk:
* @wav GstWavParse object
* @data holder for data
* @size holder for data size
*
* Parse smpl chunk from @data.
*
* Returns: %TRUE when cue chunk is available
*/
static gboolean
gst_wavparse_smpl_chunk (GstWavParse * wav, const guint8 * data, guint32 size)
{
guint32 note_number;
/*
manufacturer_id = GST_READ_UINT32_LE (data);
product_id = GST_READ_UINT32_LE (data + 4);
sample_period = GST_READ_UINT32_LE (data + 8);
*/
note_number = GST_READ_UINT32_LE (data + 12);
/*
pitch_fraction = GST_READ_UINT32_LE (data + 16);
SMPTE_format = GST_READ_UINT32_LE (data + 20);
SMPTE_offset = GST_READ_UINT32_LE (data + 24);
num_sample_loops = GST_READ_UINT32_LE (data + 28);
List of Sample Loops, 24 bytes each
*/
if (!wav->tags)
wav->tags = gst_tag_list_new_empty ();
gst_tag_list_add (wav->tags, GST_TAG_MERGE_REPLACE,
GST_TAG_MIDI_BASE_NOTE, (guint) note_number, NULL);
return TRUE;
}
/*
* gst_wavparse_adtl_chunk:
* @wav GstWavParse object
@ -1819,6 +1855,7 @@ gst_wavparse_stream_headers (GstWavParse * wav)
data_size);
gst_buffer_unmap (buf, &map);
}
break;
}
default:
GST_INFO_OBJECT (wav, "Ignoring LIST chunk %" GST_FOURCC_FORMAT,
@ -1874,6 +1911,50 @@ gst_wavparse_stream_headers (GstWavParse * wav)
wav->offset += size;
break;
}
case GST_RIFF_TAG_smpl:{
const gint data_size = size;
GST_DEBUG_OBJECT (wav, "Have 'smpl' TAG, size : %u", data_size);
if (wav->streaming) {
const guint8 *data = NULL;
if (!gst_wavparse_peek_chunk (wav, &tag, &size)) {
goto exit;
}
gst_adapter_flush (wav->adapter, 8);
wav->offset += 8;
data = gst_adapter_map (wav->adapter, data_size);
if (!gst_wavparse_smpl_chunk (wav, data, data_size)) {
goto header_read_error;
}
gst_adapter_unmap (wav->adapter);
} else {
GstMapInfo map;
wav->offset += 8;
gst_buffer_unref (buf);
buf = NULL;
if ((res =
gst_pad_pull_range (wav->sinkpad, wav->offset,
data_size, &buf)) != GST_FLOW_OK)
goto header_read_error;
gst_buffer_map (buf, &map, GST_MAP_READ);
if (!gst_wavparse_smpl_chunk (wav, (const guint8 *) map.data,
data_size)) {
goto header_read_error;
}
gst_buffer_unmap (buf, &map);
}
size = GST_ROUND_UP_2 (size);
if (wav->streaming) {
gst_adapter_flush (wav->adapter, size);
} else {
gst_buffer_unref (buf);
}
size = GST_ROUND_UP_2 (size);
wav->offset += size;
break;
}
default:
if (!gst_waveparse_ignore_chunk (wav, buf, tag, size))
/* need more data */