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Changes to correctly use first_access parameter in ac3 and lpcm plugins.

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Original commit message from CVS:
Changes to correctly use first_access parameter in ac3 and lpcm plugins.
Some general cleanups in iec958 framer.
This commit is contained in:
Michael Smith 2005-09-02 13:37:13 +00:00
parent 7fd7e36169
commit 429158ad6e
3 changed files with 140 additions and 28 deletions
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11
ChangeLog
View file

@ -1,3 +1,14 @@
2005-09-02 Michael Smith <msmith@fluendo.com>
* gst/dvdlpcmdec/gstdvdlpcmdec.c: (gst_dvdlpcmdec_chain_dvd):
* gst/iec958/ac3iec.c: (ac3iec_get_type), (ac3iec_base_init),
(ac3iec_class_init), (ac3iec_init), (ac3iec_finalize),
(ac3iec_setcaps), (ac3iec_set_property), (ac3iec_get_property),
(ac3iec_chain_dvd), (ac3iec_chain_raw), (ac3iec_change_state),
(plugin_init):
Changes to use the first_access parameter correctly in ac3 and lpcm
plugins. General cleanups in iec958 framer.
2005-09-01 Michael Smith <msmith@fluendo.com>
* configure.ac:

61
gst/dvdlpcmdec/gstdvdlpcmdec.c
View file

@ -175,7 +175,7 @@ gst_dvdlpcmdec_init (GstDvdLpcmDec * dvdlpcmdec)
gst_dvdlpcm_reset (dvdlpcmdec);
}
static gboolean
static GstPadLinkReturn
gst_dvdlpcmdec_setcaps (GstPad * pad, GstCaps * caps)
{
GstStructure *structure;
@ -358,37 +358,54 @@ gst_dvdlpcmdec_chain_dvd (GstPad * pad, GstBuffer * buf)
dvdlpcmdec->header = header;
}
GST_LOG_OBJECT (dvdlpcmdec, "first_access %d", first_access);
GST_LOG_OBJECT (dvdlpcmdec, "first_access %d, buffer length %d", first_access,
size);
/* After first_access, we have an additional 3 bytes of data we've parsed and
* don't want to handle; this is included within the value of first_access.
* So a first_access value of between 1 and 3 is just broken, we treat that
* the same as zero. first_access == 4 means we only need to create a single
* sub-buffer, greater than that we need to create two. */
/* skip access unit bytes and info */
off = 5;
/* length before access unit */
len = first_access + 1;
GST_LOG_OBJECT (dvdlpcmdec, "Creating first sub-buffer off %d, len %d", off,
len);
if (first_access > 4) {
/* length of first blength before access unit */
len = first_access - 4;
GST_LOG_OBJECT (dvdlpcmdec, "Creating first sub-buffer off %d, len %d", off,
len);
/* see if we need a subbuffer without timestamp */
if (len > 0) {
subbuf = gst_buffer_create_sub (buf, off, len);
GST_BUFFER_TIMESTAMP (subbuf) = GST_CLOCK_TIME_NONE;
ret = gst_dvdlpcmdec_chain_raw (pad, subbuf);
if (ret != GST_FLOW_OK)
goto done;
}
/* then the buffer with new timestamp */
off += len;
len = size - off;
GST_LOG_OBJECT (dvdlpcmdec, "Creating next sub-buffer off %d, len %d", off,
len);
/* see if we need a subbuffer without timestamp */
if (len > off) {
subbuf = gst_buffer_create_sub (buf, off, len);
GST_BUFFER_TIMESTAMP (subbuf) = GST_BUFFER_TIMESTAMP (buf);
ret = gst_dvdlpcmdec_chain_raw (pad, subbuf);
} else {
GST_LOG_OBJECT (dvdlpcmdec, "Creating single sub-buffer off %d, len %d",
off, size - off);
/* We don't have a valid timestamp at all */
subbuf = gst_buffer_create_sub (buf, off, size - off);
GST_BUFFER_TIMESTAMP (subbuf) = GST_CLOCK_TIME_NONE;
ret = gst_dvdlpcmdec_chain_raw (pad, subbuf);
if (ret != GST_FLOW_OK)
goto done;
}
/* then the buffer with new timestamp */
off = len;
len = size - len;
GST_LOG_OBJECT (dvdlpcmdec, "Creating next sub-buffer off %d, len %d", off,
len);
subbuf = gst_buffer_create_sub (buf, off, len);
GST_BUFFER_TIMESTAMP (subbuf) = GST_BUFFER_TIMESTAMP (buf);
ret = gst_dvdlpcmdec_chain_raw (pad, subbuf);
done:
gst_buffer_unref (buf);
gst_object_unref (dvdlpcmdec);

96
gst/iec958/ac3iec.c
View file

@ -41,7 +41,7 @@ GST_DEBUG_CATEGORY_STATIC (ac3iec_debug);
/* ElementFactory information. */
static GstElementDetails ac3iec_details = {
"AC3 to IEC958 filter",
"audio/x-ac3",
"audio/x-private1-ac3",
"Pads AC3 frames into IEC958 frames suitable for a raw SP/DIF interface",
"Martin Soto <martinsoto@users.sourceforge.net>"
};
@ -94,7 +94,9 @@ static void ac3iec_set_property (GObject * object,
static void ac3iec_get_property (GObject * object,
guint prop_id, GValue * value, GParamSpec * pspec);
static GstFlowReturn ac3iec_chain (GstPad * pad, GstBuffer * buf);
static GstFlowReturn ac3iec_chain_dvd (GstPad * pad, GstBuffer * buf);
static GstFlowReturn ac3iec_chain_raw (GstPad * pad, GstBuffer * buf);
static GstPadLinkReturn ac3iec_setcaps (GstPad * pad, GstCaps * caps);
static GstElementStateReturn ac3iec_change_state (GstElement * element);
@ -130,7 +132,6 @@ ac3iec_get_type (void)
return ac3iec_type;
}
static void
ac3iec_base_init (gpointer g_class)
{
@ -170,11 +171,12 @@ ac3iec_init (AC3IEC * ac3iec)
gst_pad_new_from_template (gst_static_pad_template_get
(&ac3iec_sink_template), "sink");
gst_element_add_pad (GST_ELEMENT (ac3iec), ac3iec->sink);
gst_pad_set_chain_function (ac3iec->sink, ac3iec_chain);
gst_pad_set_chain_function (ac3iec->sink, ac3iec_chain_dvd);
ac3iec->src =
gst_pad_new_from_template (gst_static_pad_template_get
(&ac3iec_src_template), "src");
gst_pad_set_setcaps_function (ac3iec->src, ac3iec_setcaps);
gst_element_add_pad (GST_ELEMENT (ac3iec), ac3iec->src);
ac3iec->cur_ts = GST_CLOCK_TIME_NONE;
@ -191,6 +193,24 @@ ac3iec_finalize (GObject * object)
g_free (ac3iec->padder);
}
static GstPadLinkReturn
ac3iec_setcaps (GstPad * pad, GstCaps * caps)
{
AC3IEC *ac3iec = AC3IEC (gst_pad_get_parent (pad));
gboolean res = TRUE;
GstCaps *src_caps;
src_caps = gst_caps_new_simple ("audio/x-iec958", NULL);
if (!gst_pad_set_caps (ac3iec->src, src_caps)) {
res = FALSE;
}
gst_caps_unref (src_caps);
gst_object_unref (ac3iec);
return res;
}
static void
ac3iec_set_property (GObject * object, guint prop_id,
@ -227,7 +247,58 @@ ac3iec_get_property (GObject * object, guint prop_id,
}
static GstFlowReturn
ac3iec_chain (GstPad * pad, GstBuffer * buf)
ac3iec_chain_dvd (GstPad * pad, GstBuffer * buf)
{
guint first_access;
guint8 *data;
guint size;
gint offset;
gint len;
GstBuffer *subbuf;
GstFlowReturn ret;
size = GST_BUFFER_SIZE (buf);
data = GST_BUFFER_DATA (buf);
first_access = (data[0] << 8) | data[1];
/* Skip the first_access header */
offset = 2;
if (first_access > 1) {
/* Length of data before first_access */
len = first_access - 1;
if (len > 0) {
subbuf = gst_buffer_create_sub (buf, offset, len);
GST_BUFFER_TIMESTAMP (subbuf) = GST_CLOCK_TIME_NONE;
ret = ac3iec_chain_raw (pad, subbuf);
if (ret != GST_FLOW_OK)
goto done;
}
offset += len;
len = size - offset;
subbuf = gst_buffer_create_sub (buf, offset, len);
GST_BUFFER_TIMESTAMP (subbuf) = GST_BUFFER_TIMESTAMP (buf);
ret = ac3iec_chain_raw (pad, subbuf);
} else {
/* No first_access, so no timestamp */
subbuf = gst_buffer_create_sub (buf, offset, size - offset);
GST_BUFFER_TIMESTAMP (subbuf) = GST_CLOCK_TIME_NONE;
ret = ac3iec_chain_raw (pad, subbuf);
}
done:
gst_buffer_unref (buf);
return ret;
}
static GstFlowReturn
ac3iec_chain_raw (GstPad * pad, GstBuffer * buf)
{
GstBuffer *new;
AC3IEC *ac3iec;
@ -254,9 +325,14 @@ ac3iec_chain (GstPad * pad, GstBuffer * buf)
while (event != AC3P_EVENT_PUSH) {
if (event == AC3P_EVENT_FRAME) {
/* We have a new frame: */
GstCaps *bufcaps = GST_PAD_CAPS (ac3iec->src);
/* Create a new buffer, and copy the frame data into it. */
new = gst_buffer_new_and_alloc (AC3P_IEC_FRAME_SIZE);
ret = gst_pad_alloc_buffer (ac3iec->src, 0, AC3P_IEC_FRAME_SIZE,
bufcaps, &new);
if (ret != GST_FLOW_OK)
goto buffer_alloc_failed;
memcpy (GST_BUFFER_DATA (new), ac3p_frame (ac3iec->padder),
AC3P_IEC_FRAME_SIZE);
@ -275,7 +351,15 @@ ac3iec_chain (GstPad * pad, GstBuffer * buf)
gst_buffer_unref (buf);
done:
gst_object_unref (ac3iec);
return ret;
buffer_alloc_failed:
gst_buffer_unref (buf);
goto done;
}