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gstreamer/gst/dvdlpcmdec/gstdvdlpcmdec.c
Jan Schmidt 81b3c01d04 dvdlpcmdec: Add multichannel channel maps, and send some tags 
Add a multichannel map to the output caps, and send at least a CODEC and
BITRATE tag. I'm not too sure about the 5.1 and 7.1 channel maps. I have
no samples and can't find info about the channel ordering, but this is
better than nothing.
2009-05-27 00:31:35 +01:00

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) <2005> Jan Schmidt <jan@noraisin.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/* Element-Checklist-Version: TODO */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include "gstdvdlpcmdec.h"
#include <gst/audio/multichannel.h>
GST_DEBUG_CATEGORY_STATIC (dvdlpcm_debug);
#define GST_CAT_DEFAULT dvdlpcm_debug
/* elementfactory information */
static const GstElementDetails gst_dvdlpcmdec_details =
GST_ELEMENT_DETAILS ("DVD LPCM Audio decoder",
"Codec/Decoder/Audio",
"Decode DVD LPCM frames into standard PCM audio",
"Jan Schmidt <jan@noraisin.net>\n" "Michael Smith <msmith@fluendo.com>");
static GstStaticPadTemplate gst_dvdlpcmdec_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-private1-lpcm; "
"audio/x-lpcm, "
"width = (int) { 16, 20, 24 }, "
"rate = (int) { 32000, 44100, 48000, 96000 }, "
"channels = (int) [ 1, 8 ], "
"dynamic_range = (int) [ 0, 255 ], "
"emphasis = (boolean) { TRUE, FALSE }, "
"mute = (boolean) { TRUE, FALSE } ")
);
static GstStaticPadTemplate gst_dvdlpcmdec_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("audio/x-raw-int, "
"width = (int) { 16, 24 }, "
"rate = (int) { 32000, 44100, 48000, 96000 }, "
"channels = (int) [ 1, 8 ], "
"endianness = (int) { BIG_ENDIAN }, "
"depth = (int) { 16, 24 }, " "signed = (boolean) { true }")
);
/* DvdLpcmDec signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0
/* FILL ME */
};
static void gst_dvdlpcmdec_base_init (gpointer g_class);
static void gst_dvdlpcmdec_class_init (GstDvdLpcmDecClass * klass);
static void gst_dvdlpcmdec_init (GstDvdLpcmDec * dvdlpcmdec);
static GstFlowReturn gst_dvdlpcmdec_chain_raw (GstPad * pad,
GstBuffer * buffer);
static GstFlowReturn gst_dvdlpcmdec_chain_dvd (GstPad * pad,
GstBuffer * buffer);
static gboolean gst_dvdlpcmdec_setcaps (GstPad * pad, GstCaps * caps);
static gboolean dvdlpcmdec_sink_event (GstPad * pad, GstEvent * event);
static GstStateChangeReturn gst_dvdlpcmdec_change_state (GstElement * element,
GstStateChange transition);
static GstElementClass *parent_class = NULL;
GType
gst_dvdlpcmdec_get_type (void)
{
static GType dvdlpcmdec_type = 0;
if (!dvdlpcmdec_type) {
static const GTypeInfo dvdlpcmdec_info = {
sizeof (GstDvdLpcmDecClass),
gst_dvdlpcmdec_base_init,
NULL,
(GClassInitFunc) gst_dvdlpcmdec_class_init,
NULL,
NULL,
sizeof (GstDvdLpcmDec),
0,
(GInstanceInitFunc) gst_dvdlpcmdec_init,
};
dvdlpcmdec_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstDvdLpcmDec",
&dvdlpcmdec_info, 0);
}
return dvdlpcmdec_type;
}
static void
gst_dvdlpcmdec_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_dvdlpcmdec_sink_template));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&gst_dvdlpcmdec_src_template));
gst_element_class_set_details (element_class, &gst_dvdlpcmdec_details);
}
static void
gst_dvdlpcmdec_class_init (GstDvdLpcmDecClass * klass)
{
GstElementClass *gstelement_class;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gstelement_class->change_state = gst_dvdlpcmdec_change_state;
}
static void
gst_dvdlpcm_reset (GstDvdLpcmDec * dvdlpcmdec)
{
dvdlpcmdec->rate = 0;
dvdlpcmdec->channels = 0;
dvdlpcmdec->width = 0;
dvdlpcmdec->out_width = 0;
dvdlpcmdec->dynamic_range = 0;
dvdlpcmdec->emphasis = FALSE;
dvdlpcmdec->mute = FALSE;
dvdlpcmdec->timestamp = GST_CLOCK_TIME_NONE;
dvdlpcmdec->header = 0;
gst_segment_init (&dvdlpcmdec->segment, GST_FORMAT_UNDEFINED);
}
static void
gst_dvdlpcmdec_init (GstDvdLpcmDec * dvdlpcmdec)
{
dvdlpcmdec->sinkpad =
gst_pad_new_from_static_template (&gst_dvdlpcmdec_sink_template, "sink");
gst_pad_set_setcaps_function (dvdlpcmdec->sinkpad, gst_dvdlpcmdec_setcaps);
gst_pad_set_event_function (dvdlpcmdec->sinkpad, dvdlpcmdec_sink_event);
gst_element_add_pad (GST_ELEMENT (dvdlpcmdec), dvdlpcmdec->sinkpad);
dvdlpcmdec->srcpad =
gst_pad_new_from_static_template (&gst_dvdlpcmdec_src_template, "src");
gst_pad_use_fixed_caps (dvdlpcmdec->srcpad);
gst_element_add_pad (GST_ELEMENT (dvdlpcmdec), dvdlpcmdec->srcpad);
gst_dvdlpcm_reset (dvdlpcmdec);
}
static GstAudioChannelPosition *
get_audio_channel_positions (GstDvdLpcmDec * dvdlpcmdec)
{
gint n_channels = dvdlpcmdec->channels;
GstAudioChannelPosition *ret = g_new (GstAudioChannelPosition, n_channels);
/* FIXME: The channel layouts for 5.1 and 7.1 are just guesses, I can't
* find any samples or confirmation */
switch (n_channels) {
case 8:
ret[7] = GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT;
ret[6] = GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT;
/* Fall through */
case 6:
ret[5] = GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT;
ret[4] = GST_AUDIO_CHANNEL_POSITION_REAR_LEFT;
ret[3] = GST_AUDIO_CHANNEL_POSITION_LFE;
ret[2] = GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER;
/* Fall through */
case 2:
ret[1] = GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT;
ret[0] = GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT;
break;
case 4:
ret[3] = GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT;
ret[2] = GST_AUDIO_CHANNEL_POSITION_REAR_LEFT;
ret[1] = GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT;
ret[0] = GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT;
break;
case 1:
ret[0] = GST_AUDIO_CHANNEL_POSITION_FRONT_MONO;
break;
default:
g_free (ret);
ret = NULL;
break;
}
return ret;
}
static void
gst_dvdlpcmdec_send_tags (GstDvdLpcmDec * dvdlpcmdec)
{
GstTagList *taglist;
guint bitrate = dvdlpcmdec->channels * dvdlpcmdec->out_width *
dvdlpcmdec->rate;
taglist = gst_tag_list_new ();
gst_tag_list_add (taglist, GST_TAG_MERGE_APPEND,
GST_TAG_AUDIO_CODEC, "LPCM Audio", GST_TAG_BITRATE, bitrate, NULL);
gst_element_found_tags_for_pad (GST_ELEMENT (dvdlpcmdec), dvdlpcmdec->srcpad,
taglist);
}
static gboolean
gst_dvdlpcmdec_set_outcaps (GstDvdLpcmDec * dvdlpcmdec)
{
gboolean res = TRUE;
GstCaps *src_caps;
GstAudioChannelPosition *pos;
/* Build caps to set on the src pad, which we know from the incoming caps */
src_caps = gst_caps_new_simple ("audio/x-raw-int",
"rate", G_TYPE_INT, dvdlpcmdec->rate,
"channels", G_TYPE_INT, dvdlpcmdec->channels,
"endianness", G_TYPE_INT, G_BIG_ENDIAN,
"depth", G_TYPE_INT, dvdlpcmdec->out_width,
"width", G_TYPE_INT, dvdlpcmdec->out_width,
"signed", G_TYPE_BOOLEAN, TRUE, NULL);
pos = get_audio_channel_positions (dvdlpcmdec);
if (pos) {
gst_audio_set_channel_positions (gst_caps_get_structure (src_caps, 0), pos);
g_free (pos);
}
GST_DEBUG_OBJECT (dvdlpcmdec, "Set rate %d, channels %d, width %d (out %d)",
dvdlpcmdec->rate, dvdlpcmdec->channels, dvdlpcmdec->width,
dvdlpcmdec->out_width);
res = gst_pad_set_caps (dvdlpcmdec->srcpad, src_caps);
if (res) {
GST_DEBUG_OBJECT (dvdlpcmdec, "Successfully set output caps: %"
GST_PTR_FORMAT, src_caps);
gst_dvdlpcmdec_send_tags (dvdlpcmdec);
} else {
GST_DEBUG_OBJECT (dvdlpcmdec, "Failed to set output caps: %"
GST_PTR_FORMAT, src_caps);
}
gst_caps_unref (src_caps);
return res;
}
static gboolean
gst_dvdlpcmdec_setcaps (GstPad * pad, GstCaps * caps)
{
GstStructure *structure;
gboolean res = TRUE;
GstDvdLpcmDec *dvdlpcmdec;
g_return_val_if_fail (caps != NULL, FALSE);
g_return_val_if_fail (pad != NULL, FALSE);
dvdlpcmdec = GST_DVDLPCMDEC (gst_pad_get_parent (pad));
structure = gst_caps_get_structure (caps, 0);
/* If we have the DVD structured LPCM (including header) then we wait
* for incoming data before creating the output pad caps */
if (gst_structure_has_name (structure, "audio/x-private1-lpcm")) {
gst_pad_set_chain_function (dvdlpcmdec->sinkpad, gst_dvdlpcmdec_chain_dvd);
goto done;
}
gst_pad_set_chain_function (dvdlpcmdec->sinkpad, gst_dvdlpcmdec_chain_raw);
res &= gst_structure_get_int (structure, "rate", &dvdlpcmdec->rate);
res &= gst_structure_get_int (structure, "channels", &dvdlpcmdec->channels);
res &= gst_structure_get_int (structure, "width", &dvdlpcmdec->width);
res &= gst_structure_get_int (structure, "dynamic_range",
&dvdlpcmdec->dynamic_range);
res &= gst_structure_get_boolean (structure, "emphasis",
&dvdlpcmdec->emphasis);
res &= gst_structure_get_boolean (structure, "mute", &dvdlpcmdec->mute);
if (!res)
goto caps_parse_error;
/* Output width is the input width rounded up to the nearest byte */
if (dvdlpcmdec->width == 20)
dvdlpcmdec->out_width = 24;
else
dvdlpcmdec->out_width = dvdlpcmdec->width;
res = gst_dvdlpcmdec_set_outcaps (dvdlpcmdec);
done:
gst_object_unref (dvdlpcmdec);
return res;
/* ERRORS */
caps_parse_error:
{
GST_DEBUG_OBJECT (dvdlpcmdec, "Couldn't get parameters; missing caps?");
gst_object_unref (dvdlpcmdec);
return FALSE;
}
}
static void
update_timestamps (GstDvdLpcmDec * dvdlpcmdec, GstBuffer * buf, int samples)
{
gboolean take_buf_ts = FALSE;
GST_BUFFER_DURATION (buf) =
gst_util_uint64_scale (samples, GST_SECOND, dvdlpcmdec->rate);
if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
if (GST_CLOCK_TIME_IS_VALID (dvdlpcmdec->timestamp)) {
GstClockTimeDiff one_sample = GST_SECOND / dvdlpcmdec->rate;
GstClockTimeDiff diff = GST_CLOCK_DIFF (GST_BUFFER_TIMESTAMP (buf),
dvdlpcmdec->timestamp);
if (diff > one_sample || diff < -one_sample)
take_buf_ts = TRUE;
} else {
take_buf_ts = TRUE;
}
} else if (!GST_CLOCK_TIME_IS_VALID (dvdlpcmdec->timestamp)) {
dvdlpcmdec->timestamp = 0;
}
if (take_buf_ts) {
/* Take buffer timestamp */
dvdlpcmdec->timestamp = GST_BUFFER_TIMESTAMP (buf);
} else {
GST_BUFFER_TIMESTAMP (buf) = dvdlpcmdec->timestamp;
}
dvdlpcmdec->timestamp += GST_BUFFER_DURATION (buf);
GST_LOG_OBJECT (dvdlpcmdec, "Updated timestamp to %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
}
static void
parse_header (GstDvdLpcmDec * dec, guint32 header)
{
/* We don't actually use 'dynamic range', 'mute', or 'emphasis' currently,
* but parse them out */
dec->dynamic_range = header & 0xff;
dec->mute = (header & 0x400000) != 0;
dec->emphasis = (header & 0x800000) != 0;
/* These two bits tell us the bit depth */
switch (header & 0xC000) {
case 0x8000:
dec->width = 24;
dec->out_width = 24;
break;
case 0x4000:
dec->width = 20;
dec->out_width = 24;
break;
default:
dec->width = 16;
dec->out_width = 16;
break;
}
/* Only four sample rates supported */
switch (header & 0x3000) {
case 0x0000:
dec->rate = 48000;
break;
case 0x1000:
dec->rate = 96000;
break;
case 0x2000:
dec->rate = 44100;
break;
case 0x3000:
dec->rate = 32000;
break;
}
/* And, of course, the number of channels (up to 8) */
dec->channels = ((header >> 8) & 0x7) + 1;
}
static GstFlowReturn
gst_dvdlpcmdec_chain_dvd (GstPad * pad, GstBuffer * buf)
{
GstDvdLpcmDec *dvdlpcmdec;
guint8 *data;
guint size;
guint first_access;
guint32 header;
GstBuffer *subbuf;
GstFlowReturn ret = GST_FLOW_OK;
gint off, len;
dvdlpcmdec = GST_DVDLPCMDEC (gst_pad_get_parent (pad));
size = GST_BUFFER_SIZE (buf);
data = GST_BUFFER_DATA (buf);
if (size < 5) {
/* Buffer is too small */
GST_ELEMENT_WARNING (dvdlpcmdec, STREAM, DECODE,
("Invalid data found parsing LPCM packet"),
("LPCM packet was too small. Dropping"));
ret = GST_FLOW_OK;
goto done;
}
/* We have a 5 byte header, now.
* The first two bytes are a (big endian) 16 bit offset into our buffer.
* The buffer timestamp refers to this offset.
*
* The other three bytes are a (big endian) number in which the header is
* encoded.
*/
first_access = (data[0] << 8) | data[1];
if (first_access > size) {
GST_ELEMENT_WARNING (dvdlpcmdec, STREAM, DECODE,
("Invalid data found parsing LPCM packet"),
("LPCM packet contained invalid first access. Dropping"));
ret = GST_FLOW_OK;
goto done;
}
/* Don't keep the 'frame number' low 5 bits of the first byte */
header = ((data[2] & 0xC0) << 16) | (data[3] << 8) | data[4];
/* see if we have a new header */
if (header != dvdlpcmdec->header) {
parse_header (dvdlpcmdec, header);
if (!gst_dvdlpcmdec_set_outcaps (dvdlpcmdec))
goto negotiation_failed;
dvdlpcmdec->header = header;
}
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;
if (first_access > 4) {
guint samples = 0;
GstClockTime ts;
/* length of first buffer */
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 (off + len > size) {
GST_WARNING_OBJECT (pad, "Bad first_access parameter in buffer");
GST_ELEMENT_ERROR (dvdlpcmdec, STREAM, DECODE,
(NULL),
("first_access parameter out of range: bad buffer from demuxer"));
ret = GST_FLOW_ERROR;
goto done;
}
subbuf = gst_buffer_create_sub (buf, off, len);
/* If we don't have a stored timestamp from the last packet,
* (it's straight after a new-segment, but we have one on the
* first access buffer, then calculate the timestamp to align
* this buffer to just before the first_access buffer */
if (!GST_CLOCK_TIME_IS_VALID (dvdlpcmdec->timestamp) &&
GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
switch (dvdlpcmdec->width) {
case 16:
samples = len / dvdlpcmdec->channels / 2;
break;
case 20:
samples = (len / dvdlpcmdec->channels) * 2 / 5;
break;
case 24:
samples = len / dvdlpcmdec->channels / 3;
break;
}
}
if (samples != 0) {
ts = gst_util_uint64_scale (samples, GST_SECOND, dvdlpcmdec->rate);
if (ts < GST_BUFFER_TIMESTAMP (buf))
GST_BUFFER_TIMESTAMP (subbuf) = GST_BUFFER_TIMESTAMP (buf) - ts;
else
GST_BUFFER_TIMESTAMP (subbuf) = 0;
} else {
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);
if (len > 0) {
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);
subbuf = gst_buffer_create_sub (buf, off, size - off);
GST_BUFFER_TIMESTAMP (subbuf) = GST_BUFFER_TIMESTAMP (buf);
ret = gst_dvdlpcmdec_chain_raw (pad, subbuf);
}
done:
gst_buffer_unref (buf);
gst_object_unref (dvdlpcmdec);
return ret;
/* ERRORS */
negotiation_failed:
{
GST_ELEMENT_ERROR (dvdlpcmdec, STREAM, FORMAT, (NULL),
("Failed to configure output format"));
ret = GST_FLOW_NOT_NEGOTIATED;
goto done;
}
}
static GstFlowReturn
gst_dvdlpcmdec_chain_raw (GstPad * pad, GstBuffer * buf)
{
GstDvdLpcmDec *dvdlpcmdec;
guint8 *data;
guint size;
GstFlowReturn ret;
guint samples = 0;
dvdlpcmdec = GST_DVDLPCMDEC (gst_pad_get_parent (pad));
size = GST_BUFFER_SIZE (buf);
data = GST_BUFFER_DATA (buf);
GST_LOG_OBJECT (dvdlpcmdec,
"got buffer %p of size %d with ts %" GST_TIME_FORMAT,
buf, size, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
if (dvdlpcmdec->rate == 0)
goto not_negotiated;
if (GST_BUFFER_TIMESTAMP_IS_VALID (buf))
dvdlpcmdec->timestamp = GST_BUFFER_TIMESTAMP (buf);
/* We don't currently do anything at all regarding emphasis, mute or
* dynamic_range - I'm not sure what they're for */
switch (dvdlpcmdec->width) {
case 16:
{
/* We can just pass 16-bits straight through intact, once we set
* appropriate things on the buffer */
samples = size / dvdlpcmdec->channels / 2;
if (samples < 1)
goto drop;
buf = gst_buffer_make_metadata_writable (buf);
break;
}
case 20:
{
/* Allocate a new buffer and copy 20-bit width to 24-bit */
gint64 samples = size * 8 / 20;
gint64 count = size / 10;
gint64 i;
guint8 *src;
guint8 *dest;
GstBuffer *outbuf;
GstCaps *bufcaps = GST_PAD_CAPS (dvdlpcmdec->srcpad);
if (samples < 1)
goto drop;
ret = gst_pad_alloc_buffer_and_set_caps (dvdlpcmdec->srcpad, 0,
samples * 3, bufcaps, &outbuf);
if (ret != GST_FLOW_OK)
goto buffer_alloc_failed;
gst_buffer_copy_metadata (outbuf, buf, GST_BUFFER_COPY_TIMESTAMPS);
/* adjust samples so we can calc the new timestamp */
samples = samples / dvdlpcmdec->channels;
src = data;
dest = GST_BUFFER_DATA (outbuf);
/* Copy 20-bit LPCM format to 24-bit buffers, with 0x00 in the lowest
* nibble. Note that the first 2 bytes are already correct */
for (i = 0; i < count; i++) {
dest[0] = src[0];
dest[1] = src[1];
dest[2] = src[8] & 0xf0;
dest[3] = src[2];
dest[4] = src[3];
dest[5] = (src[8] & 0x0f) << 4;
dest[6] = src[4];
dest[7] = src[5];
dest[8] = src[9] & 0x0f;
dest[9] = src[6];
dest[10] = src[7];
dest[11] = (src[9] & 0x0f) << 4;
src += 10;
dest += 12;
}
gst_buffer_unref (buf);
buf = outbuf;
break;
}
case 24:
{
/* Rearrange 24-bit LPCM format in-place. Note that the first 2
* and last byte are already correct */
guint count = size / 12;
gint i;
guint8 *src;
samples = size / dvdlpcmdec->channels / 3;
if (samples < 1)
goto drop;
/* Ensure our output buffer is writable */
buf = gst_buffer_make_writable (buf);
src = GST_BUFFER_DATA (buf);
for (i = 0; i < count; i++) {
guint8 tmp;
tmp = src[10];
src[10] = src[7];
src[7] = src[5];
src[5] = src[9];
src[9] = src[6];
src[6] = src[4];
src[4] = src[3];
src[3] = src[2];
src[2] = src[8];
src[8] = tmp;
src += 12;
}
break;
}
default:
goto invalid_width;
}
/* Set appropriate caps on it to pass downstream */
gst_buffer_set_caps (buf, GST_PAD_CAPS (dvdlpcmdec->srcpad));
update_timestamps (dvdlpcmdec, buf, samples);
ret = gst_pad_push (dvdlpcmdec->srcpad, buf);
done:
gst_object_unref (dvdlpcmdec);
return ret;
/* ERRORS */
drop:
{
GST_DEBUG_OBJECT (dvdlpcmdec, "Buffer of size %u is too small. Dropping",
GST_BUFFER_SIZE (buf));
gst_buffer_unref (buf);
ret = GST_FLOW_OK;
goto done;
}
not_negotiated:
{
GST_ELEMENT_ERROR (dvdlpcmdec, STREAM, FORMAT, (NULL),
("Buffer pushed before negotiation"));
gst_buffer_unref (buf);
ret = GST_FLOW_NOT_NEGOTIATED;
goto done;
}
buffer_alloc_failed:
{
GST_ELEMENT_ERROR (dvdlpcmdec, RESOURCE, FAILED, (NULL),
("Buffer allocation failed"));
gst_buffer_unref (buf);
goto done;
}
invalid_width:
{
GST_ELEMENT_ERROR (dvdlpcmdec, STREAM, WRONG_TYPE, (NULL),
("Invalid sample width configured"));
gst_buffer_unref (buf);
ret = GST_FLOW_NOT_NEGOTIATED;
goto done;
}
}
static gboolean
dvdlpcmdec_sink_event (GstPad * pad, GstEvent * event)
{
GstDvdLpcmDec *dvdlpcmdec;
gboolean res;
dvdlpcmdec = GST_DVDLPCMDEC (GST_PAD_PARENT (pad));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:
{
gdouble rate, arate;
GstFormat format;
gboolean update;
gint64 start, stop, pos;
gst_event_parse_new_segment_full (event, &update, &rate, &arate,
&format, &start, &stop, &pos);
GST_DEBUG_OBJECT (dvdlpcmdec,
"new segment, format=%d, start = %" G_GINT64_FORMAT
", stop = %" G_GINT64_FORMAT ", position %" G_GINT64_FORMAT,
format, start, stop, pos);
gst_segment_set_newsegment_full (&dvdlpcmdec->segment, update,
rate, arate, format, start, stop, pos);
if (format == GST_FORMAT_TIME) {
dvdlpcmdec->timestamp = GST_CLOCK_TIME_NONE;
} else {
dvdlpcmdec->timestamp = 0;
}
res = gst_pad_push_event (dvdlpcmdec->srcpad, event);
break;
}
case GST_EVENT_FLUSH_STOP:
gst_segment_init (&dvdlpcmdec->segment, GST_FORMAT_UNDEFINED);
res = gst_pad_push_event (dvdlpcmdec->srcpad, event);
break;
default:
res = gst_pad_push_event (dvdlpcmdec->srcpad, event);
break;
}
return res;
}
static GstStateChangeReturn
gst_dvdlpcmdec_change_state (GstElement * element, GstStateChange transition)
{
GstDvdLpcmDec *dvdlpcmdec = GST_DVDLPCMDEC (element);
GstStateChangeReturn res;
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_dvdlpcm_reset (dvdlpcmdec);
break;
default:
break;
}
res = parent_class->change_state (element, transition);
switch (transition) {
default:
break;
}
return res;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (dvdlpcm_debug, "dvdlpcmdec", 0, "DVD LPCM Decoder");
if (!gst_element_register (plugin, "dvdlpcmdec", GST_RANK_PRIMARY,
GST_TYPE_DVDLPCMDEC)) {
return FALSE;
}
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"dvdlpcmdec",
"Decode DVD LPCM frames into standard PCM",
plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN);
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