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gstreamer/gst/asfmux/gstasfobjects.c
Tim-Philipp Müller 9e1b75fda3 Fix FSF address 
https://bugzilla.gnome.org/show_bug.cgi?id=687520
2012-11-04 00:09:59 +00:00

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/* ASF muxer plugin for GStreamer
* Copyright (C) 2009 Thiago Santos <thiagoss@embedded.ufcg.edu.br>
*
* 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.
*/
#include "gstasfobjects.h"
#include <string.h>
/* Guids */
const Guid guids[] = {
/* asf header object */
{0x75B22630, 0x668E, 0x11CF, G_GUINT64_CONSTANT (0xA6D900AA0062CE6C)},
/* asf file properties object */
{0x8CABDCA1, 0xA947, 0x11CF, G_GUINT64_CONSTANT (0x8EE400C00C205365)},
/* asf stream properties object */
{0xB7DC0791, 0xA9B7, 0x11CF, G_GUINT64_CONSTANT (0x8EE600C00C205365)},
/* asf audio media */
{0xF8699E40, 0x5B4D, 0x11CF, G_GUINT64_CONSTANT (0xA8FD00805F5C442B)},
/* asf no error correction */
{0x20FB5700, 0x5B55, 0x11CF, G_GUINT64_CONSTANT (0xA8FD00805F5C442B)},
/* asf audio spread */
{0xBFC3CD50, 0x618F, 0x11CF, G_GUINT64_CONSTANT (0x8BB200AA00B4E220)},
/* asf header extension object */
{0x5FBF03B5, 0xA92E, 0x11CF, G_GUINT64_CONSTANT (0x8EE300C00C205365)},
/* asf reserved 1 */
{0xABD3D211, 0xA9BA, 0x11CF, G_GUINT64_CONSTANT (0x8EE600C00C205365)},
/* asf data object */
{0x75B22636, 0x668E, 0x11CF, G_GUINT64_CONSTANT (0xA6D900AA0062CE6C)},
/* asf extended stream properties object */
{0x14E6A5CB, 0xC672, 0x4332, G_GUINT64_CONSTANT (0x8399A96952065B5A)},
/* asf video media */
{0xBC19EFC0, 0x5B4D, 0x11CF, G_GUINT64_CONSTANT (0xA8FD00805F5C442B)},
/* asf simple index object */
{0x33000890, 0xE5B1, 0x11CF, G_GUINT64_CONSTANT (0x89F400A0C90349CB)},
/* asf content description */
{0x75B22633, 0x668E, 0x11CF, G_GUINT64_CONSTANT (0xA6D900AA0062CE6C)},
/* asf extended content description */
{0xD2D0A440, 0xE307, 0x11D2, G_GUINT64_CONSTANT (0x97F000A0C95EA850)},
/* asf metadata object */
{0xC5F8CBEA, 0x5BAF, 0x4877, G_GUINT64_CONSTANT (0x8467AA8C44FA4CCA)},
/* asf padding object */
{0x1806D474, 0xCADF, 0x4509, G_GUINT64_CONSTANT (0xA4BA9AABCB96AAE8)}
};
/**
* gst_asf_generate_file_id:
*
* Generates a random GUID
*
* Returns: The generated GUID
*/
void
gst_asf_generate_file_id (Guid * guid)
{
guint32 aux;
guid->v1 = g_random_int ();
aux = g_random_int ();
guid->v2 = (guint16) (aux & 0x0000FFFF);
guid->v3 = (guint16) (aux >> 16);
guid->v4 = (((guint64) g_random_int ()) << 32) | (guint64) g_random_int ();
}
/**
* gst_byte_reader_get_asf_var_size_field:
* @reader: A #GstByteReader
* @field_type: an asf field type
* @var: pointer to store the result
*
* Reads the proper data from the #GstByteReader according to the
* asf field type and stores it in var
*
* Returns: True on success, false otherwise
*/
gboolean
gst_byte_reader_get_asf_var_size_field (GstByteReader * reader,
guint8 field_type, guint32 * var)
{
guint8 aux8 = 0;
guint16 aux16 = 0;
guint32 aux32 = 0;
gboolean ret;
switch (field_type) {
case ASF_FIELD_TYPE_DWORD:
ret = gst_byte_reader_get_uint32_le (reader, &aux32);
*var = aux32;
break;
case ASF_FIELD_TYPE_WORD:
ret = gst_byte_reader_get_uint16_le (reader, &aux16);
*var = aux16;
break;
case ASF_FIELD_TYPE_BYTE:
ret = gst_byte_reader_get_uint8 (reader, &aux8);
*var = aux8;
break;
case ASF_FIELD_TYPE_NONE:
ret = TRUE;
*var = 0;
break;
default:
return FALSE;
}
return ret;
}
/**
* gst_asf_read_var_size_field:
* @data: pointer to the data to be read
* @field_type: the asf field type pointed by data
*
* Reads and returns the value read from the data, according to the
* field type given
*
* Returns: The value read
*/
guint32
gst_asf_read_var_size_field (guint8 * data, guint8 field_type)
{
switch (field_type) {
case ASF_FIELD_TYPE_DWORD:
return GST_READ_UINT32_LE (data);
case ASF_FIELD_TYPE_WORD:
return GST_READ_UINT16_LE (data);
case ASF_FIELD_TYPE_BYTE:
return data[0];
default:
return 0;
}
}
/**
* gst_asf_get_var_size_field_len:
* @field_type: the asf field type
*
* Returns: the size in bytes of a variable of field_type type
*/
guint
gst_asf_get_var_size_field_len (guint8 field_type)
{
switch (field_type) {
case ASF_FIELD_TYPE_DWORD:
return 4;
case ASF_FIELD_TYPE_WORD:
return 2;
case ASF_FIELD_TYPE_BYTE:
return 1;
default:
return 0;
}
}
/**
* gst_asf_file_info_new:
*
* Creates a new #GstAsfFileInfo
*
* Returns: the created struct
*/
GstAsfFileInfo *
gst_asf_file_info_new (void)
{
return g_new0 (GstAsfFileInfo, 1);
}
/**
* gst_asf_file_info_reset:
* @info: the #GstAsfFileInfo to be reset
*
* resets the data of a #GstFileInfo
*/
void
gst_asf_file_info_reset (GstAsfFileInfo * info)
{
info->packet_size = 0;
info->packets_count = 0;
info->broadcast = FALSE;
}
/**
* gst_asf_file_info_free:
* @info: the #GstAsfFileInfo to be freed
*
* Releases memory associated with this #GstAsfFileInfo
*/
void
gst_asf_file_info_free (GstAsfFileInfo * info)
{
g_free (info);
}
/**
* gst_asf_payload_get_size:
* @payload: the payload to get the size from
*
* Returns: the size of an asf payload of the data represented by this
* #AsfPayload
*/
guint32
gst_asf_payload_get_size (AsfPayload * payload)
{
return ASF_MULTIPLE_PAYLOAD_HEADER_SIZE + gst_buffer_get_size (payload->data);
}
/**
* gst_asf_payload_free:
* @payload: the #AsfPayload to be freed
*
* Releases teh memory associated with this payload
*/
void
gst_asf_payload_free (AsfPayload * payload)
{
gst_buffer_unref (payload->data);
g_free (payload);
}
/**
* gst_asf_get_current_time:
*
* Gets system current time in ASF time unit
* (100-nanoseconds since Jan, 1st 1601)
*
* Returns:
*/
guint64
gst_asf_get_current_time (void)
{
GTimeVal timeval;
guint64 secs;
guint64 usecs;
g_get_current_time (&timeval);
secs = (guint64) timeval.tv_sec;
usecs = (guint64) timeval.tv_usec;
return secs * G_GUINT64_CONSTANT (10000000) + usecs * 10
+ G_GUINT64_CONSTANT (116444628000000000);
}
/**
* gst_asf_match_guid:
* @data: pointer to the guid to be tested
* @guid: guid to match against data
*
* Checks if the guid pointed by data is the same
* as the guid parameter
*
* Returns: True if they are the same, false otherwise
*/
gboolean
gst_asf_match_guid (const guint8 * data, const Guid * guid)
{
Guid g;
g.v1 = GST_READ_UINT32_LE (data);
g.v2 = GST_READ_UINT16_LE (data + 4);
g.v3 = GST_READ_UINT16_LE (data + 6);
g.v4 = GST_READ_UINT64_BE (data + 8);
return g.v1 == guid->v1 &&
g.v2 == guid->v2 && g.v3 == guid->v3 && g.v4 == guid->v4;
}
/**
* gst_asf_put_i32:
* @buf: the memory to write data to
* @data: the value to be writen
*
* Writes a 32 bit signed integer to memory
*/
void
gst_asf_put_i32 (guint8 * buf, gint32 data)
{
GST_WRITE_UINT32_LE (buf, (guint32) data);
}
/**
* gst_asf_put_time:
* @buf: pointer to the buffer to write the value to
* @time: value to be writen
*
* Writes an asf time value to the buffer
*/
void
gst_asf_put_time (guint8 * buf, guint64 time)
{
GST_WRITE_UINT64_LE (buf, time);
}
/**
* gst_asf_put_guid:
* @buf: the buffer to write the guid to
* @guid: the guid to be writen
*
* Writes a GUID to the buffer
*/
void
gst_asf_put_guid (guint8 * buf, Guid guid)
{
guint32 *aux32 = (guint32 *) buf;
guint16 *aux16 = (guint16 *) & (buf[4]);
guint64 *aux64 = (guint64 *) & (buf[8]);
*aux32 = GUINT32_TO_LE (guid.v1);
*aux16 = GUINT16_TO_LE (guid.v2);
aux16 = (guint16 *) & (buf[6]);
*aux16 = GUINT16_TO_LE (guid.v3);
*aux64 = GUINT64_TO_BE (guid.v4);
}
/**
* gst_asf_put_payload:
* @buf: memory to write the payload to
* @payload: #AsfPayload to be writen
*
* Writes the asf payload to the buffer. The #AsfPayload
* packet count is incremented.
*/
void
gst_asf_put_payload (guint8 * buf, AsfPayload * payload)
{
GST_WRITE_UINT8 (buf, payload->stream_number);
GST_WRITE_UINT8 (buf + 1, payload->media_obj_num);
GST_WRITE_UINT32_LE (buf + 2, payload->offset_in_media_obj);
GST_WRITE_UINT8 (buf + 6, payload->replicated_data_length);
GST_WRITE_UINT32_LE (buf + 7, payload->media_object_size);
GST_WRITE_UINT32_LE (buf + 11, payload->presentation_time);
GST_WRITE_UINT16_LE (buf + 15, (guint16) gst_buffer_get_size (payload->data));
gst_buffer_extract (payload->data, 0, buf + 17,
gst_buffer_get_size (payload->data));
payload->packet_count++;
}
/**
* gst_asf_put_subpayload:
* @buf: buffer to write the payload to
* @payload: the payload to be writen
* @size: maximum size in bytes to write
*
* Serializes part of a payload to a buffer.
* The maximum size is checked against the payload length,
* the minimum of this size and the payload length is writen
* to the buffer and the writen size is returned.
*
* It also updates the values of the payload to match the remaining
* data.
* In case there is not enough space to write the headers, nothing is done.
*
* Returns: The writen size in bytes.
*/
guint16
gst_asf_put_subpayload (guint8 * buf, AsfPayload * payload, guint16 size)
{
guint16 payload_size;
GstBuffer *newbuf;
if (size <= ASF_MULTIPLE_PAYLOAD_HEADER_SIZE) {
return 0; /* do nothing if there is not enough space */
}
GST_WRITE_UINT8 (buf, payload->stream_number);
GST_WRITE_UINT8 (buf + 1, payload->media_obj_num);
GST_WRITE_UINT32_LE (buf + 2, payload->offset_in_media_obj);
GST_WRITE_UINT8 (buf + 6, payload->replicated_data_length);
GST_WRITE_UINT32_LE (buf + 7, payload->media_object_size);
GST_WRITE_UINT32_LE (buf + 11, payload->presentation_time);
size -= ASF_MULTIPLE_PAYLOAD_HEADER_SIZE;
payload_size = size < gst_buffer_get_size (payload->data) ?
size : gst_buffer_get_size (payload->data);
GST_WRITE_UINT16_LE (buf + 15, payload_size);
gst_buffer_extract (payload->data, 0, buf + 17, payload_size);
/* updates the payload to the remaining data */
payload->offset_in_media_obj += payload_size;
newbuf = gst_buffer_copy_region (payload->data, GST_BUFFER_COPY_ALL,
payload_size, gst_buffer_get_size (payload->data) - payload_size);
GST_BUFFER_TIMESTAMP (newbuf) = GST_BUFFER_TIMESTAMP (payload->data);
gst_buffer_unref (payload->data);
payload->data = newbuf;
payload->packet_count++;
return payload_size;
}
/**
* gst_asf_match_and_peek_obj_size:
* @data: data to be peeked at
* @guid: pointer to a guid
*
* Compares the first bytes of data against the guid parameter and
* if they match gets the object size (that are right after the guid in
* asf objects).
*
* In case the guids don't match, 0 is returned.
* If the guid is NULL the match is assumed to be true.
*
* Returns: The size of the object in case the guid matches, 0 otherwise
*/
guint64
gst_asf_match_and_peek_obj_size (const guint8 * data, const Guid * guid)
{
g_assert (data);
if (guid && !gst_asf_match_guid (data, guid)) {
/* this is not the expected object */
return 0;
}
/* return the object size */
return GST_READ_UINT64_LE (data + ASF_GUID_SIZE);
}
/**
* gst_asf_match_and_peek_obj_size_buf:
* @buf: buffer to be peeked at
* @guid: pointer to a guid
*
* Compares the first bytes of buf against the guid parameter and
* if they match gets the object size (that are right after the guid in
* asf objects).
*
* In case the guids don't match, 0 is returned.
* If the guid is NULL the match is assumed to be true.
*
* Returns: The size of the object in case the guid matches, 0 otherwise
*/
guint64
gst_asf_match_and_peek_obj_size_buf (GstBuffer * buf, const Guid * guid)
{
GstMapInfo map;
guint64 res;
gst_buffer_map (buf, &map, GST_MAP_READ);
res = gst_asf_match_and_peek_obj_size (map.data, guid);
gst_buffer_unmap (buf, &map);
return res;
}
/**
* gst_asf_parse_mult_payload:
* @reader: a #GstByteReader ready to read the multiple payload data
* @has_keyframe: pointer to return the result
*
* Parses a multiple payload section of an asf data packet
* to see if any of the paylaods has a a keyframe
*
* Notice that the #GstByteReader might not be positioned after
* this section on this function return. Because this section
* is the last one in an asf packet and the remaining data
* is probably uninteresting to the application.
*
* Returns: true on success, false if some error occurrs
*/
static gboolean
gst_asf_parse_mult_payload (GstByteReader * reader, gboolean * has_keyframe)
{
guint payloads;
guint8 payload_len_type;
guint8 rep_data_len = 0;
guint32 payload_len;
guint8 stream_num = 0;
guint8 aux = 0;
guint i;
if (!gst_byte_reader_get_uint8 (reader, &aux))
return FALSE;
payloads = (aux & 0x3F);
payload_len_type = (aux & 0xC0) >> 6;
*has_keyframe = FALSE;
for (i = 0; i < payloads; i++) {
GST_LOG ("Parsing payload %u/%u", i + 1, payloads);
if (!gst_byte_reader_get_uint8 (reader, &stream_num))
goto error;
if ((stream_num & 0x80) != 0) {
GST_LOG ("Keyframe found, stoping parse of payloads");
*has_keyframe = TRUE;
return TRUE;
}
/* skip to replicated data length */
if (!gst_byte_reader_skip (reader, 5))
goto error;
if (!gst_byte_reader_get_uint8 (reader, &rep_data_len))
goto error;
if (!gst_byte_reader_skip (reader, rep_data_len))
goto error;
if (!gst_byte_reader_get_asf_var_size_field (reader, payload_len_type,
&payload_len))
goto error;
if (!gst_byte_reader_skip (reader, payload_len))
goto error;
}
/* we do not skip the rest of the payload bytes as
this is the last data to be parsed on the buffer */
return TRUE;
error:
GST_WARNING ("Error while parsing payloads");
return FALSE;
}
/**
* gst_asf_parse_single_payload:
* @reader: a #GstByteReader ready to read the multiple payload data
* @has_keyframe: pointer to return the result
*
* Parses a single payload section of an asf data packet
* to see if any of the paylaods has a a keyframe
*
* Notice that the #GstByteReader might not be positioned after
* this section on this function return. Because this section
* is the last one in an asf packet and the remaining data
* is probably uninteresting to the application.
*
* Returns: true on success, false if some error occurrs
*/
static gboolean
gst_asf_parse_single_payload (GstByteReader * reader, gboolean * has_keyframe)
{
guint8 stream_num = 0;
if (!gst_byte_reader_get_uint8 (reader, &stream_num))
return GST_FLOW_ERROR;
*has_keyframe = (stream_num & 0x80) != 0;
/* we do not skip the rest of the payload bytes as
this is the last data to be parsed on the buffer */
return TRUE;
}
gboolean
gst_asf_parse_packet (GstBuffer * buffer, GstAsfPacketInfo * packet,
gboolean trust_delta_flag, guint packet_size)
{
/* Might be useful in future:
guint8 rep_data_len_type;
guint8 mo_number_len_type;
guint8 mo_offset_type;
*/
GstByteReader *reader;
gboolean ret = TRUE;
guint8 first = 0;
guint8 err_length = 0; /* length of the error fields */
guint8 aux = 0;
guint8 packet_len_type;
guint8 padding_len_type;
guint8 seq_len_type;
gboolean mult_payloads;
guint32 packet_len;
guint32 padd_len;
guint32 send_time = 0;
guint16 duration = 0;
gboolean has_keyframe;
GstMapInfo map;
if (packet_size != 0 && gst_buffer_get_size (buffer) != packet_size) {
GST_WARNING ("ASF packets should be aligned with buffers");
return FALSE;
}
gst_buffer_map (buffer, &map, GST_MAP_READ);
reader = gst_byte_reader_new (map.data, map.size);
GST_LOG ("Starting packet parsing, size: %" G_GSIZE_FORMAT,
gst_buffer_get_size (buffer));
if (!gst_byte_reader_get_uint8 (reader, &first))
goto error;
if (first & 0x80) { /* error correction present */
guint8 err_cor_len;
err_length += 1;
GST_DEBUG ("Packet contains error correction");
if (first & 0x60) {
GST_ERROR ("Error correction data length should be "
"set to 0 and is reserved for future use.");
return FALSE;
}
err_cor_len = (first & 0x0F);
err_length += err_cor_len;
GST_DEBUG ("Error correction data length: %d", (gint) err_cor_len);
if (!gst_byte_reader_skip (reader, err_cor_len))
goto error;
/* put payload parsing info first byte in aux var */
if (!gst_byte_reader_get_uint8 (reader, &aux))
goto error;
} else {
aux = first;
}
mult_payloads = (aux & 0x1) != 0;
packet_len_type = (aux >> 5) & 0x3;
padding_len_type = (aux >> 3) & 0x3;
seq_len_type = (aux >> 1) & 0x3;
GST_LOG ("Field sizes: packet length type: %u "
", padding length type: %u, sequence length type: %u",
gst_asf_get_var_size_field_len (packet_len_type),
gst_asf_get_var_size_field_len (padding_len_type),
gst_asf_get_var_size_field_len (seq_len_type));
if (mult_payloads) {
GST_DEBUG ("Packet contains multiple payloads");
}
if (!gst_byte_reader_get_uint8 (reader, &aux))
goto error;
/*
rep_data_len_type = aux & 0x3;
mo_offset_type = (aux >> 2) & 0x3;
mo_number_len_type = (aux >> 4) & 0x3;
*/
/* gets the fields lengths */
GST_LOG ("Getting packet and padding length");
if (!gst_byte_reader_get_asf_var_size_field (reader,
packet_len_type, &packet_len))
goto error;
if (!gst_byte_reader_skip (reader,
gst_asf_get_var_size_field_len (seq_len_type)))
goto error;
if (!gst_byte_reader_get_asf_var_size_field (reader,
padding_len_type, &padd_len))
goto error;
/* some packet size validation */
if (packet_size != 0 && packet_len_type != ASF_FIELD_TYPE_NONE) {
if (padding_len_type != ASF_FIELD_TYPE_NONE &&
packet_len + padd_len != packet_size) {
GST_WARNING ("Packet size (payload=%u + padding=%u) doesn't "
"match expected size %u", packet_len, padd_len, packet_size);
ret = FALSE;
}
/* Be forgiving if packet_len has the full packet size
* as the spec isn't really clear on its meaning.
*
* I had been taking it as the full packet size (fixed)
* until bug #607555, that convinced me that it is more likely
* the actual payloaded data size.
*/
if (packet_len == packet_size) {
GST_DEBUG ("This packet's length field represents the full "
"packet and not the payloaded data length");
ret = TRUE;
}
if (!ret)
goto end;
}
GST_LOG ("Getting send time and duration");
if (!gst_byte_reader_get_uint32_le (reader, &send_time))
goto error;
if (!gst_byte_reader_get_uint16_le (reader, &duration))
goto error;
has_keyframe = FALSE;
GST_LOG ("Checking for keyframes");
if (trust_delta_flag) {
has_keyframe = GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
} else {
if (mult_payloads) {
ret = gst_asf_parse_mult_payload (reader, &has_keyframe);
} else {
ret = gst_asf_parse_single_payload (reader, &has_keyframe);
}
}
if (!ret) {
GST_WARNING ("Failed to parse payloads");
goto end;
}
GST_DEBUG ("Received packet of length %" G_GUINT32_FORMAT
", padding %" G_GUINT32_FORMAT ", send time %" G_GUINT32_FORMAT
", duration %" G_GUINT16_FORMAT " and %s keyframe(s)",
packet_len, padd_len, send_time, duration,
(has_keyframe) ? "with" : "without");
packet->packet_size = packet_len;
packet->padding = padd_len;
packet->send_time = send_time;
packet->duration = duration;
packet->has_keyframe = has_keyframe;
packet->multiple_payloads = mult_payloads ? TRUE : FALSE;
packet->padd_field_type = padding_len_type;
packet->packet_field_type = packet_len_type;
packet->seq_field_type = seq_len_type;
packet->err_cor_len = err_length;
gst_buffer_unmap (buffer, &map);
gst_byte_reader_free (reader);
return ret;
error:
ret = FALSE;
GST_WARNING ("Error while parsing data packet");
end:
gst_buffer_unmap (buffer, &map);
gst_byte_reader_free (reader);
return ret;
}
static gboolean
gst_asf_parse_file_properties_obj (GstByteReader * reader,
GstAsfFileInfo * asfinfo)
{
guint32 min_ps = 0;
guint32 max_ps = 0;
guint64 packets = 0;
guint32 flags = 0;
GST_DEBUG ("ASF: Parsing file properties object");
/* skip until data packets count */
if (!gst_byte_reader_skip (reader, 32))
return FALSE;
if (!gst_byte_reader_get_uint64_le (reader, &packets))
return FALSE;
asfinfo->packets_count = packets;
GST_DEBUG ("ASF: packets count %" G_GUINT64_FORMAT, packets);
/* skip until flags */
if (!gst_byte_reader_skip (reader, 24))
return FALSE;
if (!gst_byte_reader_get_uint32_le (reader, &flags))
return GST_FLOW_ERROR;
asfinfo->broadcast = (flags & 0x1) == 1;
GST_DEBUG ("ASF: broadcast flag: %s", asfinfo->broadcast ? "true" : "false");
if (!gst_byte_reader_get_uint32_le (reader, &min_ps))
return GST_FLOW_ERROR;
if (!gst_byte_reader_get_uint32_le (reader, &max_ps))
return GST_FLOW_ERROR;
if (min_ps != max_ps) {
GST_WARNING ("Mininum and maximum packet size differ "
"%" G_GUINT32_FORMAT " and %" G_GUINT32_FORMAT ", "
"ASF spec states they should be the same", min_ps, max_ps);
return FALSE;
}
GST_DEBUG ("ASF: Packet size: %" G_GUINT32_FORMAT, min_ps);
asfinfo->packet_size = min_ps;
if (!gst_byte_reader_skip (reader, 4))
return FALSE;
return TRUE;
}
gboolean
gst_asf_parse_headers (GstBuffer * buffer, GstAsfFileInfo * file_info)
{
gboolean ret = TRUE;
guint32 header_objects = 0;
guint32 i;
GstByteReader *reader;
guint64 object_size;
GstMapInfo map;
gst_buffer_map (buffer, &map, GST_MAP_READ);
object_size = gst_asf_match_and_peek_obj_size (map.data,
&(guids[ASF_HEADER_OBJECT_INDEX]));
if (object_size == 0) {
GST_WARNING ("ASF: Cannot parse, header guid not found at the beginning "
" of data");
gst_buffer_unmap (buffer, &map);
return FALSE;
}
reader = gst_byte_reader_new (map.data, map.size);
if (!gst_byte_reader_skip (reader, ASF_GUID_OBJSIZE_SIZE))
goto error;
if (!gst_byte_reader_get_uint32_le (reader, &header_objects))
goto error;
GST_DEBUG ("ASF: Header has %" G_GUINT32_FORMAT " child"
" objects", header_objects);
/* skip reserved bytes */
if (!gst_byte_reader_skip (reader, 2))
goto error;
/* iterate through childs of header object */
for (i = 0; i < header_objects; i++) {
const guint8 *guid = NULL;
guint64 obj_size = 0;
if (!gst_byte_reader_get_data (reader, ASF_GUID_SIZE, &guid))
goto error;
if (!gst_byte_reader_get_uint64_le (reader, &obj_size))
goto error;
if (gst_asf_match_guid (guid, &guids[ASF_FILE_PROPERTIES_OBJECT_INDEX])) {
ret = gst_asf_parse_file_properties_obj (reader, file_info);
} else {
/* we don't know/care about this object */
if (!gst_byte_reader_skip (reader, obj_size - ASF_GUID_OBJSIZE_SIZE))
goto error;
}
if (!ret)
goto end;
}
goto end;
error:
ret = FALSE;
GST_WARNING ("ASF: Error while parsing headers");
end:
gst_buffer_unmap (buffer, &map);
gst_byte_reader_free (reader);
return ret;
}
#define MAP_GST_TO_ASF_TAG(tag, gst, asf) \
if (strcmp (tag, gst) == 0) \
return asf
/**
* gst_asf_get_asf_tag:
* @gsttag: a gstreamer tag
*
* Maps gstreamer tags to asf tags
*
* Returns: The tag corresponding name in asf files or NULL if it is not mapped
*/
const gchar *
gst_asf_get_asf_tag (const gchar * gsttag)
{
g_return_val_if_fail (gsttag != NULL, NULL);
MAP_GST_TO_ASF_TAG (gsttag, GST_TAG_TITLE, ASF_TAG_TITLE);
MAP_GST_TO_ASF_TAG (gsttag, GST_TAG_TITLE_SORTNAME, ASF_TAG_TITLE_SORTNAME);
MAP_GST_TO_ASF_TAG (gsttag, GST_TAG_ARTIST, ASF_TAG_ARTIST);
MAP_GST_TO_ASF_TAG (gsttag, GST_TAG_ARTIST_SORTNAME, ASF_TAG_ARTIST_SORTNAME);
MAP_GST_TO_ASF_TAG (gsttag, GST_TAG_ALBUM, ASF_TAG_ALBUM_TITLE);
MAP_GST_TO_ASF_TAG (gsttag, GST_TAG_ALBUM_SORTNAME,
ASF_TAG_ALBUM_TITLE_SORTNAME);
MAP_GST_TO_ASF_TAG (gsttag, GST_TAG_GENRE, ASF_TAG_GENRE);
MAP_GST_TO_ASF_TAG (gsttag, GST_TAG_COPYRIGHT, ASF_TAG_COPYRIGHT);
MAP_GST_TO_ASF_TAG (gsttag, GST_TAG_COMPOSER, ASF_TAG_COMPOSER);
MAP_GST_TO_ASF_TAG (gsttag, GST_TAG_COMMENT, ASF_TAG_COMMENT);
MAP_GST_TO_ASF_TAG (gsttag, GST_TAG_TRACK_NUMBER, ASF_TAG_TRACK_NUMBER);
return NULL;
}
guint
gst_asf_get_tag_field_type (GValue * value)
{
if (G_VALUE_HOLDS_STRING (value))
return ASF_TAG_TYPE_UNICODE_STR;
if (G_VALUE_HOLDS_UINT (value))
return ASF_TAG_TYPE_DWORD;
return -1;
}
gboolean
gst_asf_tag_present_in_content_description (const gchar * tag)
{
return strcmp (tag, GST_TAG_TITLE) == 0 ||
strcmp (tag, GST_TAG_ARTIST) == 0 ||
strcmp (tag, GST_TAG_COPYRIGHT) == 0 ||
strcmp (tag, GST_TAG_DESCRIPTION) == 0;
/* FIXME we have no tag for rating */
}
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