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gstreamer/subprojects/gst-plugins-ugly/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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, 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-private2-lpcm; "
"audio/x-private-ts-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, "
"format = (string) { S16BE, S24BE }, "
"layout = (string) interleaved, "
"rate = (int) { 32000, 44100, 48000, 96000 }, "
"channels = (int) [ 1, 8 ]")
);
#define gst_dvdlpcmdec_parent_class parent_class
G_DEFINE_TYPE (GstDvdLpcmDec, gst_dvdlpcmdec, GST_TYPE_AUDIO_DECODER);
GST_ELEMENT_REGISTER_DEFINE (dvdlpcmdec, "dvdlpcmdec", GST_RANK_PRIMARY,
GST_TYPE_DVDLPCMDEC);
static gboolean gst_dvdlpcmdec_set_format (GstAudioDecoder * bdec,
GstCaps * caps);
static GstFlowReturn gst_dvdlpcmdec_parse (GstAudioDecoder * bdec,
GstAdapter * adapter, gint * offset, gint * len);
static GstFlowReturn gst_dvdlpcmdec_handle_frame (GstAudioDecoder * bdec,
GstBuffer * buffer);
static GstFlowReturn gst_dvdlpcmdec_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static void
gst_dvdlpcmdec_class_init (GstDvdLpcmDecClass * klass)
{
GstElementClass *element_class;
GstAudioDecoderClass *gstbase_class;
element_class = (GstElementClass *) klass;
gstbase_class = (GstAudioDecoderClass *) klass;
gstbase_class->set_format = GST_DEBUG_FUNCPTR (gst_dvdlpcmdec_set_format);
gstbase_class->parse = GST_DEBUG_FUNCPTR (gst_dvdlpcmdec_parse);
gstbase_class->handle_frame = GST_DEBUG_FUNCPTR (gst_dvdlpcmdec_handle_frame);
gst_element_class_add_static_pad_template (element_class,
&gst_dvdlpcmdec_sink_template);
gst_element_class_add_static_pad_template (element_class,
&gst_dvdlpcmdec_src_template);
gst_element_class_set_static_metadata (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>");
GST_DEBUG_CATEGORY_INIT (dvdlpcm_debug, "dvdlpcmdec", 0, "DVD LPCM Decoder");
}
static void
gst_dvdlpcm_reset (GstDvdLpcmDec * dvdlpcmdec)
{
gst_audio_info_init (&dvdlpcmdec->info);
dvdlpcmdec->dynamic_range = 0;
dvdlpcmdec->emphasis = FALSE;
dvdlpcmdec->mute = FALSE;
dvdlpcmdec->header = 0;
dvdlpcmdec->mode = GST_LPCM_UNKNOWN;
}
static void
gst_dvdlpcmdec_init (GstDvdLpcmDec * dvdlpcmdec)
{
gst_dvdlpcm_reset (dvdlpcmdec);
gst_audio_decoder_set_use_default_pad_acceptcaps (GST_AUDIO_DECODER_CAST
(dvdlpcmdec), TRUE);
GST_PAD_SET_ACCEPT_TEMPLATE (GST_AUDIO_DECODER_SINK_PAD (dvdlpcmdec));
/* retrieve and intercept base class chain.
* Quite HACKish, but that's dvd specs/caps for you,
* since one buffer needs to be split into 2 frames */
dvdlpcmdec->base_chain =
GST_PAD_CHAINFUNC (GST_AUDIO_DECODER_SINK_PAD (dvdlpcmdec));
gst_pad_set_chain_function (GST_AUDIO_DECODER_SINK_PAD (dvdlpcmdec),
GST_DEBUG_FUNCPTR (gst_dvdlpcmdec_chain));
}
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 const GstAudioChannelPosition bluray_channel_positions[][8] = {
/* invalid */
{GST_AUDIO_CHANNEL_POSITION_INVALID},
/* mono */
{GST_AUDIO_CHANNEL_POSITION_MONO},
/* invalid */
{GST_AUDIO_CHANNEL_POSITION_INVALID},
/* stereo */
{GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT},
/* surround */
{GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER},
/* 2.1 */
{GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_REAR_CENTER},
/* 4.0 */
{GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
GST_AUDIO_CHANNEL_POSITION_REAR_CENTER},
/* 2.2 */
{GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT},
/* 5.0 */
{GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT},
/* 5.1 */
{GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
GST_AUDIO_CHANNEL_POSITION_LFE1},
/* 7.0 */
{GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT},
/* 7.1 */
{GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT,
GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
GST_AUDIO_CHANNEL_POSITION_LFE1},
/* invalid */
{GST_AUDIO_CHANNEL_POSITION_INVALID},
/* invalid */
{GST_AUDIO_CHANNEL_POSITION_INVALID},
/* invalid */
{GST_AUDIO_CHANNEL_POSITION_INVALID},
/* invalid */
{GST_AUDIO_CHANNEL_POSITION_INVALID}
};
static void
gst_dvdlpcmdec_send_tags (GstDvdLpcmDec * dvdlpcmdec)
{
GstTagList *taglist;
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);
gst_audio_decoder_merge_tags (GST_AUDIO_DECODER (dvdlpcmdec), taglist,
GST_TAG_MERGE_REPLACE);
gst_tag_list_unref (taglist);
}
static gboolean
gst_dvdlpcmdec_set_output_format (GstDvdLpcmDec * dvdlpcmdec)
{
gboolean res = TRUE;
res = gst_audio_decoder_set_output_format (GST_AUDIO_DECODER (dvdlpcmdec),
&dvdlpcmdec->info);
if (res) {
GST_DEBUG_OBJECT (dvdlpcmdec, "Successfully set output format");
gst_dvdlpcmdec_send_tags (dvdlpcmdec);
} else {
GST_DEBUG_OBJECT (dvdlpcmdec, "Failed to set output format");
}
return res;
}
static void
gst_dvdlpcmdec_update_audio_formats (GstDvdLpcmDec * dec, gint channels,
gint rate, GstAudioFormat format, guint8 channel_indicator,
const GstAudioChannelPosition positions[][8])
{
GST_DEBUG_OBJECT (dec, "got channels = %d, rate = %d, format = %d", channels,
rate, format);
/* Reorder the channel positions and set the default into for the audio */
if (channels < 9
&& positions[channel_indicator][0] !=
GST_AUDIO_CHANNEL_POSITION_INVALID) {
const GstAudioChannelPosition *position;
GstAudioChannelPosition sorted_position[8];
guint c;
position = positions[channel_indicator];
for (c = 0; c < channels; ++c)
sorted_position[c] = position[c];
gst_audio_channel_positions_to_valid_order (sorted_position, channels);
gst_audio_info_set_format (&dec->info, format, rate, channels,
sorted_position);
if (memcmp (position, sorted_position,
channels * sizeof (position[0])) != 0)
dec->lpcm_layout = position;
else
dec->lpcm_layout = NULL;
} else {
gst_audio_info_set_format (&dec->info, format, rate, channels, NULL);
}
}
static gboolean
gst_dvdlpcmdec_set_format (GstAudioDecoder * bdec, GstCaps * caps)
{
GstDvdLpcmDec *dvdlpcmdec = GST_DVDLPCMDEC (bdec);
GstStructure *structure;
gboolean res = TRUE;
GstAudioFormat format;
gint rate, channels, width;
gst_dvdlpcm_reset (dvdlpcmdec);
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")) {
dvdlpcmdec->mode = GST_LPCM_DVD;
goto done;
}
if (gst_structure_has_name (structure, "audio/x-private2-lpcm")) {
dvdlpcmdec->mode = GST_LPCM_1394;
goto done;
}
if (gst_structure_has_name (structure, "audio/x-private-ts-lpcm")) {
dvdlpcmdec->mode = GST_LPCM_BLURAY;
goto done;
}
dvdlpcmdec->mode = GST_LPCM_RAW;
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;
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_dvdlpcmdec_update_audio_formats (dvdlpcmdec, channels, rate, format,
channels - 1, channel_positions);
dvdlpcmdec->width = width;
res = gst_dvdlpcmdec_set_output_format (dvdlpcmdec);
done:
return res;
/* ERRORS */
caps_parse_error:
{
GST_DEBUG_OBJECT (dvdlpcmdec, "Couldn't get parameters; missing caps?");
return FALSE;
}
}
static void
parse_header (GstDvdLpcmDec * dec, guint32 header)
{
GstAudioFormat format;
gint rate, channels, width;
/* 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:
/* 24 bits in 3 bytes */
format = GST_AUDIO_FORMAT_S24BE;
width = 24;
break;
case 0x4000:
/* 20 bits in 3 bytes */
format = GST_AUDIO_FORMAT_S24BE;
width = 20;
break;
default:
format = GST_AUDIO_FORMAT_S16BE;
width = 16;
break;
}
dec->width = width;
/* Only four sample rates supported */
switch (header & 0x3000) {
case 0x0000:
rate = 48000;
break;
case 0x1000:
rate = 96000;
break;
case 0x2000:
rate = 44100;
break;
case 0x3000:
rate = 32000;
break;
default:
rate = 0;
break;
}
/* And, of course, the number of channels (up to 8) */
channels = ((header >> 8) & 0x7) + 1;
gst_dvdlpcmdec_update_audio_formats (dec, channels, rate, format,
channels - 1, channel_positions);
}
static GstFlowReturn
gst_dvdlpcmdec_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstDvdLpcmDec *dvdlpcmdec = GST_DVDLPCMDEC (parent);
guint8 data[2];
gsize size;
guint first_access;
GstBuffer *subbuf;
GstFlowReturn ret = GST_FLOW_OK;
gint off, len;
if (dvdlpcmdec->mode != GST_LPCM_DVD)
return dvdlpcmdec->base_chain (pad, parent, buf);
size = gst_buffer_get_size (buf);
if (size < 5)
goto too_small;
gst_buffer_extract (buf, 0, data, 2);
first_access = (data[0] << 8) | data[1];
if (first_access > size)
goto invalid_data;
/* After first_access, we have an additional 3 bytes of header data; 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 */
off = 2;
if (first_access > 4) {
/* length of first buffer */
len = first_access - 1;
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)
goto bad_first_access;
subbuf = gst_buffer_copy_region (buf, GST_BUFFER_COPY_ALL, off, len);
GST_BUFFER_TIMESTAMP (subbuf) = GST_CLOCK_TIME_NONE;
ret = dvdlpcmdec->base_chain (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) {
GstMemory *header, *tmp;
subbuf = gst_buffer_copy_region (buf, GST_BUFFER_COPY_ALL, off, len);
tmp = gst_buffer_peek_memory (buf, 0);
header = gst_memory_copy (tmp, 2, 3);
gst_buffer_prepend_memory (subbuf, header);
GST_BUFFER_TIMESTAMP (subbuf) = GST_BUFFER_TIMESTAMP (buf);
ret = dvdlpcmdec->base_chain (pad, parent, subbuf);
}
} else {
GST_LOG_OBJECT (dvdlpcmdec,
"Creating single sub-buffer off %d, len %" G_GSIZE_FORMAT, off,
size - off);
subbuf = gst_buffer_copy_region (buf, GST_BUFFER_COPY_ALL, off, size - off);
GST_BUFFER_TIMESTAMP (subbuf) = GST_BUFFER_TIMESTAMP (buf);
ret = dvdlpcmdec->base_chain (pad, parent, subbuf);
}
done:
gst_buffer_unref (buf);
return ret;
/* ERRORS */
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;
}
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
gst_dvdlpcmdec_parse_dvd (GstDvdLpcmDec * dvdlpcmdec, GstAdapter * adapter,
gint * offset, gint * len)
{
guint32 header;
const guint8 *data;
data = (const guint8 *) gst_adapter_map (adapter, 3);
if (!data)
goto too_small;
/* Don't keep the 'frame number' low 5 bits of the first byte */
header = ((data[0] & 0xC0) << 16) | (data[1] << 8) | data[2];
gst_adapter_unmap (adapter);
/* see if we have a new header */
if (header != dvdlpcmdec->header) {
parse_header (dvdlpcmdec, header);
if (!gst_dvdlpcmdec_set_output_format (dvdlpcmdec))
goto negotiation_failed;
dvdlpcmdec->header = header;
}
*offset = 3;
*len = gst_adapter_available (adapter) - 3;
return GST_FLOW_OK;
/* ERRORS */
too_small:
{
/* Buffer is too small */
GST_ELEMENT_WARNING (dvdlpcmdec, STREAM, DECODE,
("Invalid data found parsing LPCM packet"),
("LPCM packet was too small. Dropping"));
*offset = gst_adapter_available (adapter);
return GST_FLOW_EOS;
}
negotiation_failed:
{
GST_ELEMENT_ERROR (dvdlpcmdec, STREAM, FORMAT, (NULL),
("Failed to configure output format"));
return GST_FLOW_NOT_NEGOTIATED;
}
}
static GstFlowReturn
gst_dvdlpcmdec_parse_bluray (GstDvdLpcmDec * dvdlpcmdec, GstAdapter * adapter,
gint * offset, gint * len)
{
guint32 header;
const guint8 *data;
guint8 channel_indicator;
data = (const guint8 *) gst_adapter_map (adapter, 4);
if (!data)
goto too_small;
header = GST_READ_UINT32_BE (data);
gst_adapter_unmap (adapter);
/* see if we have a new header */
if (header != dvdlpcmdec->header) {
GstAudioFormat format;
gint rate, channels;
switch ((header >> 6) & 0x3) {
case 0x1:
format = GST_AUDIO_FORMAT_S16BE;
dvdlpcmdec->width = 16;
break;
case 0x2:
format = GST_AUDIO_FORMAT_S24BE;
dvdlpcmdec->width = 20;
break;
case 0x3:
format = GST_AUDIO_FORMAT_S24BE;
dvdlpcmdec->width = 24;
break;
default:
format = GST_AUDIO_FORMAT_UNKNOWN;
dvdlpcmdec->width = 0;
GST_WARNING ("Invalid sample depth!");
break;
}
switch ((header >> 8) & 0xf) {
case 0x1:
rate = 48000;
break;
case 0x4:
rate = 96000;
break;
case 0x5:
rate = 192000;
break;
default:
rate = 0;
GST_WARNING ("Invalid audio sampling frequency!");
break;
}
channel_indicator = (header >> 12) & 0xf;
switch (channel_indicator) {
case 0x1:
channels = 1;
break;
case 0x3:
channels = 2;
break;
case 0x4:
case 0x5:
channels = 3;
break;
case 0x6:
case 0x7:
channels = 4;
break;
case 0x8:
channels = 5;
break;
case 0x9:
channels = 6;
break;
case 0xa:
channels = 7;
break;
case 0xb:
channels = 8;
break;
default:
channels = 0;
GST_WARNING ("Invalid number of audio channels!");
goto negotiation_failed;
}
GST_DEBUG_OBJECT (dvdlpcmdec, "got channels %d rate %d format %s",
channels, rate, gst_audio_format_to_string (format));
gst_dvdlpcmdec_update_audio_formats (dvdlpcmdec, channels, rate, format,
channel_indicator, bluray_channel_positions);
if (!gst_dvdlpcmdec_set_output_format (dvdlpcmdec))
goto negotiation_failed;
dvdlpcmdec->header = header;
}
*offset = 4;
*len = gst_adapter_available (adapter) - 4;
return GST_FLOW_OK;
/* ERRORS */
too_small:
{
/* Buffer is too small */
GST_ELEMENT_WARNING (dvdlpcmdec, STREAM, DECODE,
("Invalid data found parsing LPCM packet"),
("LPCM packet was too small. Dropping"));
*offset = gst_adapter_available (adapter);
return GST_FLOW_EOS;
}
negotiation_failed:
{
GST_ELEMENT_ERROR (dvdlpcmdec, STREAM, FORMAT, (NULL),
("Failed to configure output format"));
return GST_FLOW_NOT_NEGOTIATED;
}
}
static GstFlowReturn
gst_dvdlpcmdec_parse_1394 (GstDvdLpcmDec * dvdlpcmdec, GstAdapter * adapter,
gint * offset, gint * len)
{
guint32 header;
const guint8 *data;
data = (const guint8 *) gst_adapter_map (adapter, 4);
if (!data)
goto too_small;
header = GST_READ_UINT32_BE (data);
gst_adapter_unmap (adapter);
/* see if we have a new header */
if (header != dvdlpcmdec->header) {
GstAudioFormat format;
gint rate, channels;
if (header >> 24 != 0xa0)
goto invalid_data;
switch ((header >> 6) & 0x3) {
case 0x0:
format = GST_AUDIO_FORMAT_S16BE;
dvdlpcmdec->width = 16;
break;
default:
format = GST_AUDIO_FORMAT_UNKNOWN;
dvdlpcmdec->width = 0;
GST_WARNING ("Invalid quantization word length!");
break;
}
switch ((header >> 3) & 0x7) {
case 0x1:
rate = 44100;
break;
case 0x2:
rate = 48000;
break;
default:
rate = 0;
GST_WARNING ("Invalid audio sampling frequency!");
break;
}
switch (header & 0x7) {
case 0x0: /* 2 channels dual-mono */
case 0x1: /* 2 channels stereo */
channels = 2;
break;
default:
channels = 0;
GST_WARNING ("Invalid number of audio channels!");
goto negotiation_failed;
}
gst_dvdlpcmdec_update_audio_formats (dvdlpcmdec, channels, rate, format,
channels - 1, channel_positions);
if (!gst_dvdlpcmdec_set_output_format (dvdlpcmdec))
goto negotiation_failed;
dvdlpcmdec->header = header;
}
*offset = 4;
*len = gst_adapter_available (adapter) - 4;
return GST_FLOW_OK;
/* ERRORS */
too_small:
{
/* Buffer is too small */
GST_ELEMENT_WARNING (dvdlpcmdec, STREAM, DECODE,
("Invalid data found parsing LPCM packet"),
("LPCM packet was too small. Dropping"));
*offset = gst_adapter_available (adapter);
return GST_FLOW_EOS;
}
invalid_data:
{
GST_ELEMENT_WARNING (dvdlpcmdec, STREAM, DECODE,
("Invalid data found parsing LPCM packet"),
("LPCM packet contains invalid sub_stream_id."));
return GST_FLOW_ERROR;
}
negotiation_failed:
{
GST_ELEMENT_ERROR (dvdlpcmdec, STREAM, FORMAT, (NULL),
("Failed to configure output format"));
return GST_FLOW_NOT_NEGOTIATED;
}
}
static GstFlowReturn
gst_dvdlpcmdec_parse (GstAudioDecoder * bdec, GstAdapter * adapter,
gint * offset, gint * len)
{
GstDvdLpcmDec *dvdlpcmdec = GST_DVDLPCMDEC (bdec);
switch (dvdlpcmdec->mode) {
case GST_LPCM_UNKNOWN:
return GST_FLOW_NOT_NEGOTIATED;
case GST_LPCM_RAW:
*offset = 0;
*len = gst_adapter_available (adapter);
return GST_FLOW_OK;
case GST_LPCM_DVD:
return gst_dvdlpcmdec_parse_dvd (dvdlpcmdec, adapter, offset, len);
case GST_LPCM_1394:
return gst_dvdlpcmdec_parse_1394 (dvdlpcmdec, adapter, offset, len);
case GST_LPCM_BLURAY:
return gst_dvdlpcmdec_parse_bluray (dvdlpcmdec, adapter, offset, len);
}
return GST_FLOW_ERROR;
}
static GstFlowReturn
gst_dvdlpcmdec_handle_frame (GstAudioDecoder * bdec, GstBuffer * buf)
{
GstDvdLpcmDec *dvdlpcmdec = GST_DVDLPCMDEC (bdec);
gsize size;
GstFlowReturn ret;
guint samples = 0;
gint rate, channels;
/* no fancy draining */
if (G_UNLIKELY (!buf))
return GST_FLOW_OK;
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)));
rate = GST_AUDIO_INFO_RATE (&dvdlpcmdec->info);
channels = GST_AUDIO_INFO_CHANNELS (&dvdlpcmdec->info);
if (rate == 0)
goto not_negotiated;
/* 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 / channels / 2;
if (samples < 1)
goto drop;
gst_buffer_ref (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;
GstMapInfo srcmap, destmap;
guint8 *src;
guint8 *dest;
GstBuffer *outbuf;
if (samples < 1)
goto drop;
outbuf = gst_buffer_new_allocate (NULL, samples * 3, NULL);
gst_buffer_copy_into (outbuf, buf, GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
/* adjust samples so we can calc the new timestamp */
samples = samples / channels;
gst_buffer_map (buf, &srcmap, GST_MAP_READ);
gst_buffer_map (outbuf, &destmap, GST_MAP_WRITE);
src = srcmap.data;
dest = destmap.data;
/* 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_unmap (outbuf, &destmap);
gst_buffer_unmap (buf, &srcmap);
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;
GstMapInfo srcmap, destmap;
guint8 *src, *dest;
GstBuffer *outbuf;
samples = size / channels / 3;
if (samples < 1)
goto drop;
outbuf = gst_buffer_new_allocate (NULL, size, NULL);
gst_buffer_copy_into (outbuf, buf, GST_BUFFER_COPY_TIMESTAMPS, 0, -1);
gst_buffer_map (buf, &srcmap, GST_MAP_READ);
gst_buffer_map (outbuf, &destmap, GST_MAP_READWRITE);
src = srcmap.data;
dest = destmap.data;
for (i = 0; i < count; i++) {
dest[0] = src[0];
dest[1] = src[1];
dest[11] = src[11];
dest[10] = src[7];
dest[7] = src[5];
dest[5] = src[9];
dest[9] = src[6];
dest[6] = src[4];
dest[4] = src[3];
dest[3] = src[2];
dest[2] = src[8];
dest[8] = src[10];
src += 12;
dest += 12;
}
gst_buffer_unmap (outbuf, &destmap);
gst_buffer_unmap (buf, &srcmap);
buf = outbuf;
break;
}
default:
goto invalid_width;
}
if (dvdlpcmdec->lpcm_layout) {
buf = gst_buffer_make_writable (buf);
gst_audio_buffer_reorder_channels (buf, dvdlpcmdec->info.finfo->format,
dvdlpcmdec->info.channels, dvdlpcmdec->lpcm_layout,
dvdlpcmdec->info.position);
}
ret = gst_audio_decoder_finish_frame (bdec, buf, 1);
done:
return ret;
/* ERRORS */
drop:
{
GST_DEBUG_OBJECT (dvdlpcmdec,
"Buffer of size %" G_GSIZE_FORMAT " is too small. Dropping", size);
ret = GST_FLOW_OK;
goto done;
}
not_negotiated:
{
GST_ELEMENT_ERROR (dvdlpcmdec, STREAM, FORMAT, (NULL),
("Buffer pushed before negotiation"));
ret = GST_FLOW_NOT_NEGOTIATED;
goto done;
}
invalid_width:
{
GST_ELEMENT_ERROR (dvdlpcmdec, STREAM, WRONG_TYPE, (NULL),
("Invalid sample width configured"));
ret = GST_FLOW_NOT_NEGOTIATED;
goto done;
}
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return GST_ELEMENT_REGISTER (dvdlpcmdec, plugin);
}
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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