static gboolean
gst_ogg_avi_parse_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstOggAviParse *ogg;
gboolean ret;
ogg = GST_OGG_AVI_PARSE (parent);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = gst_ogg_avi_parse_setcaps (pad, caps);
gst_event_unref (event);
break;
}
case GST_EVENT_FLUSH_START:
ret = gst_pad_push_event (ogg->srcpad, event);
break;
case GST_EVENT_FLUSH_STOP:
ogg_sync_reset (&ogg->sync);
ogg_stream_reset (&ogg->stream);
ogg->discont = TRUE;
ret = gst_pad_push_event (ogg->srcpad, event);
break;
default:
ret = gst_pad_push_event (ogg->srcpad, event);
break;
}
return ret;
}
static void
gst_ogg_avi_parse_finalize (GObject * object)
{
GstOggAviParse *ogg = GST_OGG_AVI_PARSE (object);
GST_LOG_OBJECT (ogg, "Disposing of object %p", ogg);
ogg_sync_clear (&ogg->sync);
ogg_stream_clear (&ogg->stream);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static GstStateChangeReturn
gst_ogg_avi_parse_change_state (GstElement * element, GstStateChange transition)
{
GstOggAviParse *ogg;
GstStateChangeReturn result = GST_STATE_CHANGE_FAILURE;
ogg = GST_OGG_AVI_PARSE (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
ogg_sync_init (&ogg->sync);
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
ogg_sync_reset (&ogg->sync);
ogg_stream_reset (&ogg->stream);
ogg->serial = -1;
ogg->discont = TRUE;
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;
default:
break;
}
result = parent_class->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_NULL:
ogg_sync_clear (&ogg->sync);
break;
default:
break;
}
return result;
}
static gboolean
gst_ogg_avi_parse_event (GstPad * pad, GstEvent * event)
{
GstOggAviParse *ogg;
gboolean ret;
ogg = GST_OGG_AVI_PARSE (GST_OBJECT_PARENT (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
ret = gst_pad_push_event (ogg->srcpad, event);
break;
case GST_EVENT_FLUSH_STOP:
ogg_sync_reset (&ogg->sync);
ogg_stream_reset (&ogg->stream);
ogg->discont = TRUE;
ret = gst_pad_push_event (ogg->srcpad, event);
break;
default:
ret = gst_pad_push_event (ogg->srcpad, event);
break;
}
return ret;
}
static GstFlowReturn
gst_ogg_avi_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
{
GstFlowReturn result = GST_FLOW_OK;
GstOggAviParse *ogg;
guint size;
gchar *oggbuf;
gint ret = -1;
ogg = GST_OGG_AVI_PARSE (parent);
size = gst_buffer_get_size (buffer);
GST_LOG_OBJECT (ogg, "Chain function received buffer of size %d", size);
if (GST_BUFFER_IS_DISCONT (buffer)) {
ogg_sync_reset (&ogg->sync);
ogg->discont = TRUE;
}
/* write data to sync layer */
oggbuf = ogg_sync_buffer (&ogg->sync, size);
gst_buffer_extract (buffer, 0, oggbuf, size);
ogg_sync_wrote (&ogg->sync, size);
gst_buffer_unref (buffer);
/* try to get as many packets out of the stream as possible */
do {
ogg_page page;
/* try to swap out a page */
ret = ogg_sync_pageout (&ogg->sync, &page);
if (ret == 0) {
GST_DEBUG_OBJECT (ogg, "need more data");
break;
} else if (ret == -1) {
GST_DEBUG_OBJECT (ogg, "discont in pages");
ogg->discont = TRUE;
} else {
/* new unknown stream, init the ogg stream with the serial number of the
* page. */
if (ogg->serial == -1) {
ogg->serial = ogg_page_serialno (&page);
ogg_stream_init (&ogg->stream, ogg->serial);
}
/* submit page */
if (ogg_stream_pagein (&ogg->stream, &page) != 0) {
GST_WARNING_OBJECT (ogg, "ogg stream choked on page resetting stream");
ogg_sync_reset (&ogg->sync);
ogg->discont = TRUE;
continue;
}
/* try to get as many packets as possible out of the page */
do {
ogg_packet packet;
ret = ogg_stream_packetout (&ogg->stream, &packet);
GST_LOG_OBJECT (ogg, "packetout gave %d", ret);
switch (ret) {
case 0:
break;
case -1:
/* out of sync, We mark a DISCONT. */
ogg->discont = TRUE;
break;
case 1:
result = gst_ogg_avi_parse_push_packet (ogg, &packet);
if (result != GST_FLOW_OK)
goto done;
break;
default:
GST_WARNING_OBJECT (ogg,
"invalid return value %d for ogg_stream_packetout, resetting stream",
ret);
break;
}
}
while (ret != 0);
}
}
while (ret != 0);
done:
return result;
}
static gboolean
gst_ogg_avi_parse_setcaps (GstPad * pad, GstCaps * caps)
{
GstOggAviParse *ogg;
GstStructure *structure;
const GValue *codec_data;
GstBuffer *buffer;
GstMapInfo map;
guint8 *ptr;
gsize left;
guint32 sizes[3];
GstCaps *outcaps;
gint i, offs;
ogg = GST_OGG_AVI_PARSE (GST_OBJECT_PARENT (pad));
structure = gst_caps_get_structure (caps, 0);
/* take codec data */
codec_data = gst_structure_get_value (structure, "codec_data");
if (codec_data == NULL)
goto no_data;
/* only buffers are valid */
if (G_VALUE_TYPE (codec_data) != GST_TYPE_BUFFER)
goto wrong_format;
/* Now parse the data */
buffer = gst_value_get_buffer (codec_data);
/* first 22 bytes are bits_per_sample, channel_mask, GUID
* Then we get 3 LE guint32 with the 3 header sizes
* then we get the bytes of the 3 headers. */
gst_buffer_map (buffer, &map, GST_MAP_READ);
ptr = map.data;
left = map.size;
GST_LOG_OBJECT (ogg, "configuring codec_data of size %" G_GSIZE_FORMAT, left);
/* skip headers */
ptr += 22;
left -= 22;
/* we need at least 12 bytes for the packet sizes of the 3 headers */
if (left < 12)
goto buffer_too_small;
/* read sizes of the 3 headers */
sizes[0] = GST_READ_UINT32_LE (ptr);
sizes[1] = GST_READ_UINT32_LE (ptr + 4);
sizes[2] = GST_READ_UINT32_LE (ptr + 8);
GST_DEBUG_OBJECT (ogg, "header sizes: %u %u %u", sizes[0], sizes[1],
sizes[2]);
left -= 12;
/* and we need at least enough data for all the headers */
if (left < sizes[0] + sizes[1] + sizes[2])
goto buffer_too_small;
/* set caps */
outcaps = gst_caps_new_empty_simple ("audio/x-vorbis");
gst_pad_set_caps (ogg->srcpad, outcaps);
gst_caps_unref (outcaps);
/* copy header data */
offs = 34;
for (i = 0; i < 3; i++) {
GstBuffer *out;
/* now output the raw vorbis header packets */
out = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, offs, sizes[i]);
gst_pad_push (ogg->srcpad, out);
offs += sizes[i];
}
gst_buffer_unmap (buffer, &map);
return TRUE;
/* ERRORS */
no_data:
{
GST_DEBUG_OBJECT (ogg, "no codec_data found in caps");
return FALSE;
}
wrong_format:
{
GST_DEBUG_OBJECT (ogg, "codec_data is not a buffer");
return FALSE;
}
buffer_too_small:
{
GST_DEBUG_OBJECT (ogg, "codec_data is too small");
gst_buffer_unmap (buffer, &map);
return FALSE;
}
}
