/**
* gst_amr_parse_sink_setcaps:
* @sinkpad: GstPad
* @caps: GstCaps
*
* Returns: TRUE on success.
*/
static gboolean
gst_amr_parse_sink_setcaps (GstBaseParse * parse, GstCaps * caps)
{
GstAmrParse *amrparse;
GstStructure *structure;
const gchar *name;
amrparse = GST_AMR_PARSE (parse);
structure = gst_caps_get_structure (caps, 0);
name = gst_structure_get_name (structure);
GST_DEBUG_OBJECT (amrparse, "setcaps: %s", name);
if (!strncmp (name, "audio/x-amr-wb-sh", 17)) {
amrparse->block_size = block_size_wb;
amrparse->wide = 1;
} else if (!strncmp (name, "audio/x-amr-nb-sh", 17)) {
amrparse->block_size = block_size_nb;
amrparse->wide = 0;
} else {
GST_WARNING ("Unknown caps");
return FALSE;
}
amrparse->need_header = FALSE;
gst_base_parse_set_frame_rate (GST_BASE_PARSE (amrparse), 50, 1, 2, 2);
gst_amr_parse_set_src_caps (amrparse);
return TRUE;
}
static GstFlowReturn
gst_amr_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
GstAmrParse *amrparse = GST_AMR_PARSE (parse);
if (!amrparse->sent_codec_tag) {
GstTagList *taglist;
GstCaps *caps;
/* codec tag */
caps = gst_pad_get_current_caps (GST_BASE_PARSE_SRC_PAD (parse));
if (G_UNLIKELY (caps == NULL)) {
if (GST_PAD_IS_FLUSHING (GST_BASE_PARSE_SRC_PAD (parse))) {
GST_INFO_OBJECT (parse, "Src pad is flushing");
return GST_FLOW_FLUSHING;
} else {
GST_INFO_OBJECT (parse, "Src pad is not negotiated!");
return GST_FLOW_NOT_NEGOTIATED;
}
}
taglist = gst_tag_list_new_empty ();
gst_pb_utils_add_codec_description_to_tag_list (taglist,
GST_TAG_AUDIO_CODEC, caps);
gst_caps_unref (caps);
gst_base_parse_merge_tags (parse, taglist, GST_TAG_MERGE_REPLACE);
gst_tag_list_unref (taglist);
/* also signals the end of first-frame processing */
amrparse->sent_codec_tag = TRUE;
}
return GST_FLOW_OK;
}
/**
* gst_amr_parse_stop:
* @parse: #GstBaseParse.
*
* Implementation of "stop" vmethod in #GstBaseParse class.
*
* Returns: TRUE on success.
*/
static gboolean
gst_amr_parse_stop (GstBaseParse * parse)
{
GstAmrParse *amrparse;
amrparse = GST_AMR_PARSE (parse);
GST_DEBUG ("stop");
amrparse->need_header = TRUE;
amrparse->header = 0;
return TRUE;
}
/**
* gst_amr_parse_start:
* @parse: #GstBaseParse.
*
* Implementation of "start" vmethod in #GstBaseParse class.
*
* Returns: TRUE on success.
*/
static gboolean
gst_amr_parse_start (GstBaseParse * parse)
{
GstAmrParse *amrparse;
amrparse = GST_AMR_PARSE (parse);
GST_DEBUG ("start");
amrparse->need_header = TRUE;
amrparse->header = 0;
amrparse->sent_codec_tag = FALSE;
return TRUE;
}
/**
* gst_amr_parse_check_valid_frame:
* @parse: #GstBaseParse.
* @buffer: #GstBuffer.
* @framesize: Output variable where the found frame size is put.
* @skipsize: Output variable which tells how much data needs to be skipped
* until a frame header is found.
*
* Implementation of "check_valid_frame" vmethod in #GstBaseParse class.
*
* Returns: TRUE if the given data contains valid frame.
*/
gboolean
gst_amr_parse_check_valid_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
{
GstBuffer *buffer;
const guint8 *data;
gint fsize, mode, dsize;
GstAmrParse *amrparse;
amrparse = GST_AMR_PARSE (parse);
buffer = frame->buffer;
data = GST_BUFFER_DATA (buffer);
dsize = GST_BUFFER_SIZE (buffer);
GST_LOG ("buffer: %d bytes", dsize);
if (amrparse->need_header) {
if (dsize >= AMR_MIME_HEADER_SIZE &&
gst_amr_parse_parse_header (amrparse, data, skipsize)) {
amrparse->need_header = FALSE;
gst_base_parse_set_frame_rate (GST_BASE_PARSE (amrparse), 50, 1, 2, 2);
} else {
GST_WARNING ("media doesn't look like a AMR format");
}
/* We return FALSE, so this frame won't get pushed forward. Instead,
the "skip" value is set, so next time we will receive a valid frame. */
return FALSE;
}
/* Does this look like a possible frame header candidate? */
if ((data[0] & 0x83) == 0) {
/* Yep. Retrieve the frame size */
mode = (data[0] >> 3) & 0x0F;
fsize = amrparse->block_size[mode] + 1; /* +1 for the header byte */
/* We recognize this data as a valid frame when:
* - We are in sync. There is no need for extra checks then
* - We are in EOS. There might not be enough data to check next frame
* - Sync is lost, but the following data after this frame seem
* to contain a valid header as well (and there is enough data to
* perform this check)
*/
if (fsize &&
(!GST_BASE_PARSE_LOST_SYNC (parse) || GST_BASE_PARSE_DRAINING (parse)
|| (dsize > fsize && (data[fsize] & 0x83) == 0))) {
*framesize = fsize;
return TRUE;
}
}
/**
* gst_amr_parse_check_valid_frame:
* @parse: #GstBaseParse.
* @buffer: #GstBuffer.
* @framesize: Output variable where the found frame size is put.
* @skipsize: Output variable which tells how much data needs to be skipped
* until a frame header is found.
*
* Implementation of "check_valid_frame" vmethod in #GstBaseParse class.
*
* Returns: TRUE if the given data contains valid frame.
*/
static GstFlowReturn
gst_amr_parse_handle_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, gint * skipsize)
{
GstBuffer *buffer;
GstMapInfo map;
gint fsize = 0, mode, dsize;
GstAmrParse *amrparse;
GstFlowReturn ret = GST_FLOW_OK;
gboolean found = FALSE;
amrparse = GST_AMR_PARSE (parse);
buffer = frame->buffer;
gst_buffer_map (buffer, &map, GST_MAP_READ);
dsize = map.size;
GST_LOG ("buffer: %d bytes", dsize);
if (amrparse->need_header) {
if (dsize >= AMR_MIME_HEADER_SIZE &&
gst_amr_parse_parse_header (amrparse, map.data, skipsize)) {
amrparse->need_header = FALSE;
gst_base_parse_set_frame_rate (GST_BASE_PARSE (amrparse), 50, 1, 2, 2);
} else {
GST_WARNING ("media doesn't look like a AMR format");
}
/* We return FALSE, so this frame won't get pushed forward. Instead,
the "skip" value is set, so next time we will receive a valid frame. */
goto done;
}
*skipsize = 1;
/* Does this look like a possible frame header candidate? */
if ((map.data[0] & 0x83) == 0) {
/* Yep. Retrieve the frame size */
mode = (map.data[0] >> 3) & 0x0F;
fsize = amrparse->block_size[mode] + 1; /* +1 for the header byte */
/* We recognize this data as a valid frame when:
* - We are in sync. There is no need for extra checks then
* - We are in EOS. There might not be enough data to check next frame
* - Sync is lost, but the following data after this frame seem
* to contain a valid header as well (and there is enough data to
* perform this check)
*/
if (fsize) {
*skipsize = 0;
/* in sync, no further check */
if (!GST_BASE_PARSE_LOST_SYNC (parse)) {
found = TRUE;
} else if (dsize > fsize) {
/* enough data, check for next sync */
if ((map.data[fsize] & 0x83) == 0)
found = TRUE;
} else if (GST_BASE_PARSE_DRAINING (parse)) {
/* not enough, but draining, so ok */
found = TRUE;
}
}
}
