gstreamer/gst/dvdlpcmdec/gstdvdlpcmdec.c

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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/audio.h>
GST_DEBUG_CATEGORY_STATIC (dvdlpcm_debug);
#define GST_CAT_DEFAULT dvdlpcm_debug
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,
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GST_STATIC_CAPS ("audio/x-raw, "
"format = (string) { S16BE, S24BE }, "
"layout = (string) interleaved, "
"rate = (int) { 32000, 44100, 48000, 96000 }, "
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"channels = (int) [ 1, 8 ]")
);
/* 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);
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static GstFlowReturn gst_dvdlpcmdec_chain_raw (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
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static GstFlowReturn gst_dvdlpcmdec_chain_dvd (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static gboolean gst_dvdlpcmdec_setcaps (GstPad * pad, GstCaps * caps);
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static gboolean dvdlpcmdec_sink_event (GstPad * pad, GstObject * parent,
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_simple (element_class, "DVD LPCM Audio decoder",
"Codec/Decoder/Audio",
"Decode DVD LPCM frames into standard PCM audio",
"Jan Schmidt <jan@noraisin.net>, Michael Smith <msmith@fluendo.com>");
}
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)
{
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gst_audio_info_init (&dvdlpcmdec->info);
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_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 const GstAudioChannelPosition channel_positions[][8] = {
{GST_AUDIO_CHANNEL_POSITION_MONO},
{GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT},
{GST_AUDIO_CHANNEL_POSITION_INVALID},
{GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT},
{GST_AUDIO_CHANNEL_POSITION_INVALID},
{GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
GST_AUDIO_CHANNEL_POSITION_LFE1, GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT},
{GST_AUDIO_CHANNEL_POSITION_INVALID},
{GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
GST_AUDIO_CHANNEL_POSITION_LFE1, GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT},
{GST_AUDIO_CHANNEL_POSITION_INVALID}
};
static void
gst_dvdlpcmdec_send_tags (GstDvdLpcmDec * dvdlpcmdec)
{
GstTagList *taglist;
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guint bitrate;
gint bpf, rate;
bpf = GST_AUDIO_INFO_BPF (&dvdlpcmdec->info);
rate = GST_AUDIO_INFO_RATE (&dvdlpcmdec->info);
bitrate = bpf * 8 * rate;
taglist = gst_tag_list_new (GST_TAG_AUDIO_CODEC, "LPCM Audio",
GST_TAG_BITRATE, bitrate, NULL);
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gst_pad_push_event (dvdlpcmdec->srcpad, gst_event_new_tag (taglist));
}
static gboolean
gst_dvdlpcmdec_set_outcaps (GstDvdLpcmDec * dvdlpcmdec)
{
gboolean res = TRUE;
GstCaps *src_caps;
/* Build caps to set on the src pad, which we know from the incoming caps */
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src_caps = gst_audio_info_to_caps (&dvdlpcmdec->info);
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;
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GstAudioFormat format;
gint rate, channels, width;
const GstAudioChannelPosition *position;
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);
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res &= gst_structure_get_int (structure, "rate", &rate);
res &= gst_structure_get_int (structure, "channels", &channels);
res &= gst_structure_get_int (structure, "width", &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;
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switch (width) {
case 24:
case 20:
format = GST_AUDIO_FORMAT_S24BE;
break;
case 16:
format = GST_AUDIO_FORMAT_S16BE;
break;
default:
format = GST_AUDIO_FORMAT_UNKNOWN;
break;
}
gst_audio_info_set_format (&dvdlpcmdec->info, format, rate, channels, NULL);
if (channels < 9
&& channel_positions[channels - 1][0] !=
GST_AUDIO_CHANNEL_POSITION_INVALID) {
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dvdlpcmdec->info.flags &= ~GST_AUDIO_FLAG_UNPOSITIONED;
position = channel_positions[channels - 1];
dvdlpcmdec->lpcm_layout = position;
memcpy (dvdlpcmdec->info.position, position,
sizeof (GstAudioChannelPosition) * channels);
gst_audio_channel_positions_to_valid_order (dvdlpcmdec->info.position,
channels);
}
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dvdlpcmdec->width = 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;
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gint rate;
rate = GST_AUDIO_INFO_RATE (&dvdlpcmdec->info);
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GST_BUFFER_DURATION (buf) = gst_util_uint64_scale (samples, GST_SECOND, rate);
if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
if (GST_CLOCK_TIME_IS_VALID (dvdlpcmdec->timestamp)) {
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GstClockTimeDiff one_sample = GST_SECOND / 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)
{
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GstAudioFormat format;
gint rate, channels;
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/* 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:
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/* 24 bits in 3 bytes */
format = GST_AUDIO_FORMAT_S24BE;
break;
case 0x4000:
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/* 20 bits in 3 bytes */
format = GST_AUDIO_FORMAT_S24BE;
break;
default:
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format = GST_AUDIO_FORMAT_S16BE;
break;
}
/* Only four sample rates supported */
switch (header & 0x3000) {
case 0x0000:
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rate = 48000;
break;
case 0x1000:
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rate = 96000;
break;
case 0x2000:
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rate = 44100;
break;
case 0x3000:
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rate = 32000;
break;
default:
rate = 0;
break;
}
/* And, of course, the number of channels (up to 8) */
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channels = ((header >> 8) & 0x7) + 1;
gst_audio_info_set_format (&dec->info, format, rate, channels, NULL);
if (channels < 9
&& channel_positions[channels - 1][0] !=
GST_AUDIO_CHANNEL_POSITION_INVALID) {
const GstAudioChannelPosition *position;
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dec->info.flags &= ~GST_AUDIO_FLAG_UNPOSITIONED;
position = channel_positions[channels - 1];
dec->lpcm_layout = position;
memcpy (dec->info.position, position,
sizeof (GstAudioChannelPosition) * channels);
gst_audio_channel_positions_to_valid_order (dec->info.position, channels);
}
}
static GstFlowReturn
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gst_dvdlpcmdec_chain_dvd (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstDvdLpcmDec *dvdlpcmdec;
guint8 *data;
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gsize size;
guint first_access;
guint32 header;
GstBuffer *subbuf;
GstFlowReturn ret = GST_FLOW_OK;
gint off, len;
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gint rate, channels;
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dvdlpcmdec = GST_DVDLPCMDEC (parent);
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data = gst_buffer_map (buf, &size, NULL, GST_MAP_READ);
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if (size < 5)
goto too_small;
/* 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];
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if (first_access > size)
goto invalid_data;
/* 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 %" G_GSIZE_FORMAT,
first_access, size);
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rate = GST_AUDIO_INFO_RATE (&dvdlpcmdec->info);
channels = GST_AUDIO_INFO_CHANNELS (&dvdlpcmdec->info);
/* 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 */
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if (off + len > size)
goto bad_first_access;
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subbuf = gst_buffer_copy_region (buf, GST_BUFFER_COPY_ALL, off, len);
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/* 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:
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samples = len / channels / 2;
break;
case 20:
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samples = (len / channels) * 2 / 5;
break;
case 24:
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samples = len / channels / 3;
break;
}
}
if (samples != 0) {
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ts = gst_util_uint64_scale (samples, GST_SECOND, 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;
}
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ret = gst_dvdlpcmdec_chain_raw (pad, parent, 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) {
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subbuf = gst_buffer_copy_region (buf, GST_BUFFER_COPY_ALL, off, len);
GST_BUFFER_TIMESTAMP (subbuf) = GST_BUFFER_TIMESTAMP (buf);
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ret = gst_dvdlpcmdec_chain_raw (pad, parent, subbuf);
}
} else {
GST_LOG_OBJECT (dvdlpcmdec,
"Creating single sub-buffer off %d, len %" G_GSIZE_FORMAT, off,
size - off);
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subbuf = gst_buffer_copy_region (buf, GST_BUFFER_COPY_ALL, off, size - off);
GST_BUFFER_TIMESTAMP (subbuf) = GST_BUFFER_TIMESTAMP (buf);
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ret = gst_dvdlpcmdec_chain_raw (pad, parent, subbuf);
}
done:
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gst_buffer_unmap (buf, data, size);
gst_buffer_unref (buf);
return ret;
/* ERRORS */
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too_small:
{
/* 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;
}
invalid_data:
{
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;
}
negotiation_failed:
{
GST_ELEMENT_ERROR (dvdlpcmdec, STREAM, FORMAT, (NULL),
("Failed to configure output format"));
ret = GST_FLOW_NOT_NEGOTIATED;
goto done;
}
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bad_first_access:
{
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;
}
}
static GstFlowReturn
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gst_dvdlpcmdec_chain_raw (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstDvdLpcmDec *dvdlpcmdec;
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gsize size;
GstFlowReturn ret;
guint samples = 0;
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gint rate, channels;
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dvdlpcmdec = GST_DVDLPCMDEC (parent);
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size = gst_buffer_get_size (buf);
GST_LOG_OBJECT (dvdlpcmdec,
"got buffer %p of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT,
buf, size, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
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rate = GST_AUDIO_INFO_RATE (&dvdlpcmdec->info);
channels = GST_AUDIO_INFO_CHANNELS (&dvdlpcmdec->info);
if (rate == 0)
goto not_negotiated;
if (GST_BUFFER_TIMESTAMP_IS_VALID (buf))
dvdlpcmdec->timestamp = GST_BUFFER_TIMESTAMP (buf);
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/* 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:
{
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/* We can just pass 16-bits straight through intact, once we set
* appropriate things on the buffer */
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samples = size / channels / 2;
if (samples < 1)
goto drop;
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buf = gst_buffer_make_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;
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guint8 *src, *osrc;
guint8 *dest, *odest;
GstBuffer *outbuf;
if (samples < 1)
goto drop;
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outbuf = gst_buffer_new_allocate (NULL, samples * 3, 0);
gst_buffer_copy_into (outbuf, buf, GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
/* adjust samples so we can calc the new timestamp */
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samples = samples / channels;
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src = osrc = gst_buffer_map (buf, NULL, NULL, GST_MAP_READ);
dest = odest = gst_buffer_map (outbuf, NULL, NULL, GST_MAP_WRITE);
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/* 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;
}
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gst_buffer_unmap (outbuf, odest, -1);
gst_buffer_unmap (buf, osrc, -1);
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;
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guint8 *src, *osrc;
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samples = size / channels / 3;
if (samples < 1)
goto drop;
/* Ensure our output buffer is writable */
buf = gst_buffer_make_writable (buf);
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src = osrc = gst_buffer_map (buf, NULL, NULL, GST_MAP_READWRITE);
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;
}
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gst_buffer_unmap (buf, osrc, -1);
break;
}
default:
goto invalid_width;
}
update_timestamps (dvdlpcmdec, buf, samples);
if (dvdlpcmdec->lpcm_layout)
gst_audio_buffer_reorder_channels (buf, dvdlpcmdec->info.finfo->format,
dvdlpcmdec->info.channels, dvdlpcmdec->lpcm_layout,
dvdlpcmdec->info.position);
ret = gst_pad_push (dvdlpcmdec->srcpad, buf);
done:
return ret;
/* ERRORS */
drop:
{
GST_DEBUG_OBJECT (dvdlpcmdec,
"Buffer of size %" G_GSIZE_FORMAT " is too small. Dropping", size);
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;
}
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
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dvdlpcmdec_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstDvdLpcmDec *dvdlpcmdec;
gboolean res;
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dvdlpcmdec = GST_DVDLPCMDEC (parent);
switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
res = gst_dvdlpcmdec_setcaps (pad, caps);
gst_event_unref (event);
break;
}
case GST_EVENT_SEGMENT:
{
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GstSegment seg;
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gst_event_copy_segment (event, &seg);
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GST_DEBUG_OBJECT (dvdlpcmdec, "segment %" GST_SEGMENT_FORMAT, &seg);
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dvdlpcmdec->segment = seg;
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if (seg.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);