/* GStreamer RIFF I/O
* Copyright (C) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
*
* riff-read.c: RIFF input file parsing
*
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <gst/gstutils.h>
#include <gst/tag/tag.h>
#include "riff-read.h"
GST_DEBUG_CATEGORY_EXTERN (riff_debug);
#define GST_CAT_DEFAULT riff_debug
/**
* gst_riff_read_chunk:
* @element: caller element (used for debugging).
* @pad: pad to pull data from.
* @offset: offset to pull from, incremented by this function.
* @tag: fourcc of the chunk (returned by this function).
* @chunk_data: buffer (returned by this function).
*
* Reads a single chunk of data. 'JUNK' chunks are skipped
* automatically.
*
* Returns: flow status.
*/
GstFlowReturn
gst_riff_read_chunk (GstElement * element,
GstPad * pad, guint64 * _offset, guint32 * tag, GstBuffer ** _chunk_data)
{
GstBuffer *buf;
GstFlowReturn res;
GstMapInfo info;
guint size;
guint64 offset = *_offset;
g_return_val_if_fail (element != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (pad != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (tag != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (_chunk_data != NULL, GST_FLOW_ERROR);
skip_junk:
size = 8;
buf = NULL;
if ((res = gst_pad_pull_range (pad, offset, size, &buf)) != GST_FLOW_OK)
return res;
else if (gst_buffer_get_size (buf) < size)
goto too_small;
gst_buffer_map (buf, &info, GST_MAP_READ);
*tag = GST_READ_UINT32_LE (info.data);
size = GST_READ_UINT32_LE (info.data + 4);
gst_buffer_unmap (buf, &info);
gst_buffer_unref (buf);
GST_DEBUG_OBJECT (element, "fourcc=%" GST_FOURCC_FORMAT ", size=%u",
GST_FOURCC_ARGS (*tag), size);
/* skip 'JUNK' chunks */
if (*tag == GST_RIFF_TAG_JUNK || *tag == GST_RIFF_TAG_JUNQ) {
size = GST_ROUND_UP_2 (size);
*_offset += 8 + size;
offset += 8 + size;
GST_DEBUG_OBJECT (element, "skipping JUNK chunk");
goto skip_junk;
}
buf = NULL;
if ((res = gst_pad_pull_range (pad, offset + 8, size, &buf)) != GST_FLOW_OK)
return res;
else if (gst_buffer_get_size (buf) < size)
goto too_small;
*_chunk_data = buf;
*_offset += 8 + GST_ROUND_UP_2 (size);
return GST_FLOW_OK;
/* ERRORS */
too_small:
{
/* short read, we return EOS to mark the EOS case */
GST_DEBUG_OBJECT (element, "not enough data (available=%" G_GSIZE_FORMAT
", needed=%u)", gst_buffer_get_size (buf), size);
gst_buffer_unref (buf);
return GST_FLOW_EOS;
}
}
/**
* gst_riff_parse_chunk:
* @element: caller element (used for debugging).
* @buf: input buffer.
* @offset: offset in the buffer in the caller. Is incremented
* by the read size by this function.
* @fourcc: fourcc (returned by this function0 of the chunk.
* @chunk_data: buffer (returned by the function) containing the
* chunk data, which may be NULL if chunksize == 0
*
* Reads a single chunk.
*
* Returns: FALSE on error, TRUE otherwise
*/
gboolean
gst_riff_parse_chunk (GstElement * element, GstBuffer * buf,
guint * _offset, guint32 * _fourcc, GstBuffer ** chunk_data)
{
guint size, bufsize;
guint32 fourcc;
guint8 *ptr;
GstMapInfo info;
guint offset = *_offset;
g_return_val_if_fail (element != NULL, FALSE);
g_return_val_if_fail (buf != NULL, FALSE);
g_return_val_if_fail (_offset != NULL, FALSE);
g_return_val_if_fail (_fourcc != NULL, FALSE);
g_return_val_if_fail (chunk_data != NULL, FALSE);
*chunk_data = NULL;
*_fourcc = 0;
bufsize = gst_buffer_get_size (buf);
if (bufsize == offset)
goto end_offset;
if (bufsize < offset + 8)
goto too_small;
/* read header */
gst_buffer_map (buf, &info, GST_MAP_READ);
ptr = info.data + offset;
fourcc = GST_READ_UINT32_LE (ptr);
size = GST_READ_UINT32_LE (ptr + 4);
gst_buffer_unmap (buf, &info);
GST_DEBUG_OBJECT (element, "fourcc=%" GST_FOURCC_FORMAT ", size=%u",
GST_FOURCC_ARGS (fourcc), size);
/* be paranoid: size may be nonsensical value here, such as (guint) -1 */
if (G_UNLIKELY (size > G_MAXINT))
goto bogus_size;
if (bufsize < size + 8 + offset) {
GST_DEBUG_OBJECT (element,
"Needed chunk data (%d) is more than available (%d), shortcutting",
size, bufsize - 8 - offset);
size = bufsize - 8 - offset;
}
if (size)
*chunk_data =
gst_buffer_copy_region (buf, GST_BUFFER_COPY_ALL, offset + 8, size);
else
*chunk_data = NULL;
*_fourcc = fourcc;
*_offset += 8 + GST_ROUND_UP_2 (size);
return TRUE;
/* ERRORS */
end_offset:
{
GST_DEBUG_OBJECT (element, "End of chunk (offset %d)", offset);
return FALSE;
}
too_small:
{
GST_DEBUG_OBJECT (element,
"Failed to parse chunk header (offset %d, %d available, %d needed)",
offset, bufsize, 8);
return FALSE;
}
bogus_size:
{
GST_ERROR_OBJECT (element, "Broken file: bogus chunk size %u", size);
return FALSE;
}
}
/**
* gst_riff_parse_file_header:
* @element: caller element (used for debugging/error).
* @buf: input buffer from which the file header will be parsed,
* should be at least 12 bytes long.
* @doctype: a fourcc (returned by this function) to indicate the
* type of document (according to the header).
*
* Reads the first few bytes from the provided buffer, checks
* if this stream is a RIFF stream, and determines document type.
* This function takes ownership of @buf so it should not be used anymore
* after calling this function.
*
* Returns: FALSE if this is not a RIFF stream (in which case the
* caller should error out; we already throw an error), or TRUE
* if it is.
*/
gboolean
gst_riff_parse_file_header (GstElement * element,
GstBuffer * buf, guint32 * doctype)
{
GstMapInfo info;
guint32 tag;
g_return_val_if_fail (buf != NULL, FALSE);
g_return_val_if_fail (doctype != NULL, FALSE);
gst_buffer_map (buf, &info, GST_MAP_READ);
if (info.size < 12)
goto too_small;
tag = GST_READ_UINT32_LE (info.data);
if (tag != GST_RIFF_TAG_RIFF && tag != GST_RIFF_TAG_AVF0
&& tag != GST_RIFF_TAG_RF64)
goto not_riff;
*doctype = GST_READ_UINT32_LE (info.data + 8);
gst_buffer_unmap (buf, &info);
gst_buffer_unref (buf);
return TRUE;
/* ERRORS */
too_small:
{
GST_ELEMENT_ERROR (element, STREAM, WRONG_TYPE, (NULL),
("Not enough data to parse RIFF header (%" G_GSIZE_FORMAT " available,"
" %d needed)", info.size, 12));
gst_buffer_unmap (buf, &info);
gst_buffer_unref (buf);
return FALSE;
}
not_riff:
{
GST_ELEMENT_ERROR (element, STREAM, WRONG_TYPE, (NULL),
("Stream is no RIFF stream: 0x%" G_GINT32_MODIFIER "x", tag));
gst_buffer_unmap (buf, &info);
gst_buffer_unref (buf);
return FALSE;
}
}
/**
* gst_riff_parse_strh:
* @element: caller element (used for debugging/error).
* @buf: input data to be used for parsing, stripped from header.
* @strh: a pointer (returned by this function) to a filled-in
* strh structure. Caller should free it.
*
* Parses a strh structure from input data. Takes ownership of @buf.
*
* Returns: TRUE if parsing succeeded, otherwise FALSE. The stream
* should be skipped on error, but it is not fatal.
*/
gboolean
gst_riff_parse_strh (GstElement * element,
GstBuffer * buf, gst_riff_strh ** _strh)
{
gst_riff_strh *strh;
GstMapInfo info;
g_return_val_if_fail (buf != NULL, FALSE);
g_return_val_if_fail (_strh != NULL, FALSE);
gst_buffer_map (buf, &info, GST_MAP_READ);
if (info.size < sizeof (gst_riff_strh))
goto too_small;
strh = g_memdup (info.data, info.size);
gst_buffer_unmap (buf, &info);
gst_buffer_unref (buf);
#if (G_BYTE_ORDER == G_BIG_ENDIAN)
strh->type = GUINT32_FROM_LE (strh->type);
strh->fcc_handler = GUINT32_FROM_LE (strh->fcc_handler);
strh->flags = GUINT32_FROM_LE (strh->flags);
strh->priority = GUINT32_FROM_LE (strh->priority);
strh->init_frames = GUINT32_FROM_LE (strh->init_frames);
strh->scale = GUINT32_FROM_LE (strh->scale);
strh->rate = GUINT32_FROM_LE (strh->rate);
strh->start = GUINT32_FROM_LE (strh->start);
strh->length = GUINT32_FROM_LE (strh->length);
strh->bufsize = GUINT32_FROM_LE (strh->bufsize);
strh->quality = GUINT32_FROM_LE (strh->quality);
strh->samplesize = GUINT32_FROM_LE (strh->samplesize);
#endif
/* avoid divisions by zero */
if (!strh->scale)
strh->scale = 1;
if (!strh->rate)
strh->rate = 1;
/* debug */
GST_INFO_OBJECT (element, "strh tag found:");
GST_INFO_OBJECT (element, " type %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (strh->type));
GST_INFO_OBJECT (element, " fcc_handler %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (strh->fcc_handler));
GST_INFO_OBJECT (element, " flags 0x%08x", strh->flags);
GST_INFO_OBJECT (element, " priority %d", strh->priority);
GST_INFO_OBJECT (element, " init_frames %d", strh->init_frames);
GST_INFO_OBJECT (element, " scale %d", strh->scale);
GST_INFO_OBJECT (element, " rate %d", strh->rate);
GST_INFO_OBJECT (element, " start %d", strh->start);
GST_INFO_OBJECT (element, " length %d", strh->length);
GST_INFO_OBJECT (element, " bufsize %d", strh->bufsize);
GST_INFO_OBJECT (element, " quality %d", strh->quality);
GST_INFO_OBJECT (element, " samplesize %d", strh->samplesize);
*_strh = strh;
return TRUE;
/* ERRORS */
too_small:
{
GST_ERROR_OBJECT (element,
"Too small strh (%" G_GSIZE_FORMAT " available, %d needed)",
info.size, (int) sizeof (gst_riff_strh));
gst_buffer_unmap (buf, &info);
gst_buffer_unref (buf);
return FALSE;
}
}
/**
* gst_riff_parse_strf_vids:
* @element: caller element (used for debugging/error).
* @buf: input data to be used for parsing, stripped from header.
* @strf: a pointer (returned by this function) to a filled-in
* strf/vids structure. Caller should free it.
* @data: a pointer (returned by this function) to a buffer
* containing extradata for this particular stream (e.g.
* palette, codec initialization data).
*
* Parses a video stream's strf structure plus optionally some
* extradata from input data. This function takes ownership of @buf.
*
* Returns: TRUE if parsing succeeded, otherwise FALSE. The stream
* should be skipped on error, but it is not fatal.
*/
gboolean
gst_riff_parse_strf_vids (GstElement * element,
GstBuffer * buf, gst_riff_strf_vids ** _strf, GstBuffer ** data)
{
gst_riff_strf_vids *strf;
GstMapInfo info;
g_return_val_if_fail (buf != NULL, FALSE);
g_return_val_if_fail (_strf != NULL, FALSE);
g_return_val_if_fail (data != NULL, FALSE);
gst_buffer_map (buf, &info, GST_MAP_READ);
if (info.size < sizeof (gst_riff_strf_vids))
goto too_small;
strf = g_memdup (info.data, info.size);
gst_buffer_unmap (buf, &info);
#if (G_BYTE_ORDER == G_BIG_ENDIAN)
strf->size = GUINT32_FROM_LE (strf->size);
strf->width = GUINT32_FROM_LE (strf->width);
strf->height = GUINT32_FROM_LE (strf->height);
strf->planes = GUINT16_FROM_LE (strf->planes);
strf->bit_cnt = GUINT16_FROM_LE (strf->bit_cnt);
strf->compression = GUINT32_FROM_LE (strf->compression);
strf->image_size = GUINT32_FROM_LE (strf->image_size);
strf->xpels_meter = GUINT32_FROM_LE (strf->xpels_meter);
strf->ypels_meter = GUINT32_FROM_LE (strf->ypels_meter);
strf->num_colors = GUINT32_FROM_LE (strf->num_colors);
strf->imp_colors = GUINT32_FROM_LE (strf->imp_colors);
#endif
/* size checking */
*data = NULL;
if (strf->size > info.size) {
GST_WARNING_OBJECT (element,
"strf_vids header gave %d bytes data, only %" G_GSIZE_FORMAT
" available", strf->size, info.size);
strf->size = info.size;
}
if (sizeof (gst_riff_strf_vids) < info.size) {
*data =
gst_buffer_copy_region (buf, GST_BUFFER_COPY_ALL,
sizeof (gst_riff_strf_vids), info.size - sizeof (gst_riff_strf_vids));
}
gst_buffer_unref (buf);
/* debug */
GST_INFO_OBJECT (element, "strf tag found in context vids:");
GST_INFO_OBJECT (element, " size %d", strf->size);
GST_INFO_OBJECT (element, " width %d", strf->width);
GST_INFO_OBJECT (element, " height %d", strf->height);
GST_INFO_OBJECT (element, " planes %d", strf->planes);
GST_INFO_OBJECT (element, " bit_cnt %d", strf->bit_cnt);
GST_INFO_OBJECT (element, " compression %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (strf->compression));
GST_INFO_OBJECT (element, " image_size %d", strf->image_size);
GST_INFO_OBJECT (element, " xpels_meter %d", strf->xpels_meter);
GST_INFO_OBJECT (element, " ypels_meter %d", strf->ypels_meter);
GST_INFO_OBJECT (element, " num_colors %d", strf->num_colors);
GST_INFO_OBJECT (element, " imp_colors %d", strf->imp_colors);
if (*data)
GST_INFO_OBJECT (element, " %" G_GSIZE_FORMAT " bytes extradata",
gst_buffer_get_size (*data));
*_strf = strf;
return TRUE;
/* ERRORS */
too_small:
{
GST_ERROR_OBJECT (element,
"Too small strf_vids (%" G_GSIZE_FORMAT " available, %d needed)",
info.size, (int) sizeof (gst_riff_strf_vids));
gst_buffer_unmap (buf, &info);
gst_buffer_unref (buf);
return FALSE;
}
}
/**
* gst_riff_parse_strf_auds:
* @element: caller element (used for debugging/error).
* @buf: input data to be used for parsing, stripped from header.
* @strf: a pointer (returned by this function) to a filled-in
* strf/auds structure. Caller should free it.
* @data: a pointer (returned by this function) to a buffer
* containing extradata for this particular stream (e.g.
* codec initialization data).
*
* Parses an audio stream's strf structure plus optionally some
* extradata from input data. This function takes ownership of @buf.
* use.
*
* Returns: TRUE if parsing succeeded, otherwise FALSE. The stream
* should be skipped on error, but it is not fatal.
*/
gboolean
gst_riff_parse_strf_auds (GstElement * element,
GstBuffer * buf, gst_riff_strf_auds ** _strf, GstBuffer ** data)
{
gst_riff_strf_auds *strf;
GstMapInfo info;
g_return_val_if_fail (buf != NULL, FALSE);
g_return_val_if_fail (_strf != NULL, FALSE);
g_return_val_if_fail (data != NULL, FALSE);
gst_buffer_map (buf, &info, GST_MAP_READ);
if (info.size < sizeof (gst_riff_strf_auds))
goto too_small;
strf = g_memdup (info.data, info.size);
#if (G_BYTE_ORDER == G_BIG_ENDIAN)
strf->format = GUINT16_FROM_LE (strf->format);
strf->channels = GUINT16_FROM_LE (strf->channels);
strf->rate = GUINT32_FROM_LE (strf->rate);
strf->av_bps = GUINT32_FROM_LE (strf->av_bps);
strf->blockalign = GUINT16_FROM_LE (strf->blockalign);
strf->bits_per_sample = GUINT16_FROM_LE (strf->bits_per_sample);
#endif
/* size checking */
*data = NULL;
if (info.size > sizeof (gst_riff_strf_auds) + 2) {
gint len;
len = GST_READ_UINT16_LE (&info.data[16]);
if (len + 2 + sizeof (gst_riff_strf_auds) > info.size) {
GST_WARNING_OBJECT (element,
"Extradata indicated %d bytes, but only %" G_GSIZE_FORMAT
" available", len, info.size - 2 - sizeof (gst_riff_strf_auds));
len = info.size - 2 - sizeof (gst_riff_strf_auds);
}
if (len)
*data = gst_buffer_copy_region (buf, GST_BUFFER_COPY_ALL,
sizeof (gst_riff_strf_auds) + 2, len);
}
/* debug */
GST_INFO_OBJECT (element, "strf tag found in context auds:");
GST_INFO_OBJECT (element, " format %d", strf->format);
GST_INFO_OBJECT (element, " channels %d", strf->channels);
GST_INFO_OBJECT (element, " rate %d", strf->rate);
GST_INFO_OBJECT (element, " av_bps %d", strf->av_bps);
GST_INFO_OBJECT (element, " blockalign %d", strf->blockalign);
GST_INFO_OBJECT (element, " bits/sample %d", strf->bits_per_sample);
if (*data)
GST_INFO_OBJECT (element, " %" G_GSIZE_FORMAT " bytes extradata",
gst_buffer_get_size (*data));
gst_buffer_unmap (buf, &info);
gst_buffer_unref (buf);
*_strf = strf;
return TRUE;
/* ERROR */
too_small:
{
GST_ERROR_OBJECT (element,
"Too small strf_auds (%" G_GSIZE_FORMAT " available"
", %" G_GSIZE_FORMAT " needed)", info.size,
sizeof (gst_riff_strf_auds));
gst_buffer_unmap (buf, &info);
gst_buffer_unref (buf);
return FALSE;
}
}
/**
* gst_riff_parse_strf_iavs:
* @element: caller element (used for debugging/error).
* @buf: input data to be used for parsing, stripped from header.
* @strf: a pointer (returned by this function) to a filled-in
* strf/iavs structure. Caller should free it.
* @data: a pointer (returned by this function) to a buffer
* containing extradata for this particular stream (e.g.
* codec initialization data).
*
* Parses a interleaved (also known as "complex") stream´s strf
* structure plus optionally some extradata from input data. This
* function takes ownership of @buf.
*
* Returns: TRUE if parsing succeeded, otherwise FALSE.
*/
gboolean
gst_riff_parse_strf_iavs (GstElement * element,
GstBuffer * buf, gst_riff_strf_iavs ** _strf, GstBuffer ** data)
{
gst_riff_strf_iavs *strf;
GstMapInfo info;
g_return_val_if_fail (buf != NULL, FALSE);
g_return_val_if_fail (_strf != NULL, FALSE);
g_return_val_if_fail (data != NULL, FALSE);
gst_buffer_map (buf, &info, GST_MAP_READ);
if (info.size < sizeof (gst_riff_strf_iavs))
goto too_small;
strf = g_memdup (info.data, info.size);
gst_buffer_unmap (buf, &info);
gst_buffer_unref (buf);
#if (G_BYTE_ORDER == G_BIG_ENDIAN)
strf->DVAAuxSrc = GUINT32_FROM_LE (strf->DVAAuxSrc);
strf->DVAAuxCtl = GUINT32_FROM_LE (strf->DVAAuxCtl);
strf->DVAAuxSrc1 = GUINT32_FROM_LE (strf->DVAAuxSrc1);
strf->DVAAuxCtl1 = GUINT32_FROM_LE (strf->DVAAuxCtl1);
strf->DVVAuxSrc = GUINT32_FROM_LE (strf->DVVAuxSrc);
strf->DVVAuxCtl = GUINT32_FROM_LE (strf->DVVAuxCtl);
strf->DVReserved1 = GUINT32_FROM_LE (strf->DVReserved1);
strf->DVReserved2 = GUINT32_FROM_LE (strf->DVReserved2);
#endif
/* debug */
GST_INFO_OBJECT (element, "strf tag found in context iavs:");
GST_INFO_OBJECT (element, " DVAAuxSrc %08x", strf->DVAAuxSrc);
GST_INFO_OBJECT (element, " DVAAuxCtl %08x", strf->DVAAuxCtl);
GST_INFO_OBJECT (element, " DVAAuxSrc1 %08x", strf->DVAAuxSrc1);
GST_INFO_OBJECT (element, " DVAAuxCtl1 %08x", strf->DVAAuxCtl1);
GST_INFO_OBJECT (element, " DVVAuxSrc %08x", strf->DVVAuxSrc);
GST_INFO_OBJECT (element, " DVVAuxCtl %08x", strf->DVVAuxCtl);
GST_INFO_OBJECT (element, " DVReserved1 %08x", strf->DVReserved1);
GST_INFO_OBJECT (element, " DVReserved2 %08x", strf->DVReserved2);
*_strf = strf;
*data = NULL;
return TRUE;
/* ERRORS */
too_small:
{
GST_ERROR_OBJECT (element,
"Too small strf_iavs (%" G_GSIZE_FORMAT "available"
", %" G_GSIZE_FORMAT " needed)", info.size,
sizeof (gst_riff_strf_iavs));
gst_buffer_unmap (buf, &info);
gst_buffer_unref (buf);
return FALSE;
}
}
static void
parse_tag_value (GstElement * element, GstTagList * taglist, const gchar * type,
guint8 * ptr, guint tsize)
{
static const gchar *env_vars[] = { "GST_AVI_TAG_ENCODING",
"GST_RIFF_TAG_ENCODING", "GST_TAG_ENCODING", NULL
};
GType tag_type;
gchar *val;
tag_type = gst_tag_get_type (type);
val = gst_tag_freeform_string_to_utf8 ((gchar *) ptr, tsize, env_vars);
if (val != NULL) {
if (tag_type == G_TYPE_STRING) {
gst_tag_list_add (taglist, GST_TAG_MERGE_APPEND, type, val, NULL);
} else {
GValue tag_val = { 0, };
g_value_init (&tag_val, tag_type);
if (gst_value_deserialize (&tag_val, val)) {
gst_tag_list_add_value (taglist, GST_TAG_MERGE_APPEND, type, &tag_val);
} else {
GST_WARNING_OBJECT (element, "could not deserialize '%s' into a "
"tag %s of type %s", val, type, g_type_name (tag_type));
}
g_value_unset (&tag_val);
}
g_free (val);
} else {
GST_WARNING_OBJECT (element, "could not extract %s tag", type);
}
}
/**
* gst_riff_parse_info:
* @element: caller element (used for debugging/error).
* @buf: input data to be used for parsing, stripped from header.
* @taglist: a pointer to a taglist (returned by this function)
* containing information about this stream. May be
* NULL if no supported tags were found.
*
* Parses stream metadata from input data.
*/
void
gst_riff_parse_info (GstElement * element,
GstBuffer * buf, GstTagList ** _taglist)
{
GstMapInfo info;
guint8 *ptr;
gsize left;
guint tsize;
guint32 tag;
const gchar *type;
GstTagList *taglist;
g_return_if_fail (_taglist != NULL);
if (!buf) {
*_taglist = NULL;
return;
}
gst_buffer_map (buf, &info, GST_MAP_READ);
taglist = gst_tag_list_new_empty ();
ptr = info.data;
left = info.size;
while (left > 8) {
tag = GST_READ_UINT32_LE (ptr);
tsize = GST_READ_UINT32_LE (ptr + 4);
GST_MEMDUMP_OBJECT (element, "tag chunk", ptr, MIN (tsize + 8, left));
left -= 8;
ptr += 8;
GST_DEBUG ("tag %" GST_FOURCC_FORMAT ", size %u",
GST_FOURCC_ARGS (tag), tsize);
if (tsize > left) {
GST_WARNING_OBJECT (element,
"Tagsize %d is larger than available data %" G_GSIZE_FORMAT,
tsize, left);
tsize = left;
}
/* make uppercase */
tag = tag & 0xDFDFDFDF;
/* find out the type of metadata */
switch (tag) {
case GST_RIFF_INFO_IARL:
type = GST_TAG_LOCATION;
break;
case GST_RIFF_INFO_IAAR:
type = GST_TAG_ALBUM_ARTIST;
break;
case GST_RIFF_INFO_IART:
type = GST_TAG_ARTIST;
break;
case GST_RIFF_INFO_ICMS:
type = NULL; /*"Commissioner"; */
break;
case GST_RIFF_INFO_ICMT:
type = GST_TAG_COMMENT;
break;
case GST_RIFF_INFO_ICOP:
type = GST_TAG_COPYRIGHT;
break;
case GST_RIFF_INFO_ICRD:
type = GST_TAG_DATE_TIME;
break;
case GST_RIFF_INFO_ICRP:
type = NULL; /*"Cropped"; */
break;
case GST_RIFF_INFO_IDIM:
type = NULL; /*"Dimensions"; */
break;
case GST_RIFF_INFO_IDPI:
type = NULL; /*"Dots per Inch"; */
break;
case GST_RIFF_INFO_IENG:
type = NULL; /*"Engineer"; */
break;
case GST_RIFF_INFO_IGNR:
type = GST_TAG_GENRE;
break;
case GST_RIFF_INFO_IKEY:
type = GST_TAG_KEYWORDS;
break;
case GST_RIFF_INFO_ILGT:
type = NULL; /*"Lightness"; */
break;
case GST_RIFF_INFO_IMED:
type = NULL; /*"Medium"; */
break;
case GST_RIFF_INFO_INAM:
type = GST_TAG_TITLE;
break;
case GST_RIFF_INFO_IPLT:
type = NULL; /*"Palette"; */
break;
case GST_RIFF_INFO_IPRD:
type = GST_TAG_ALBUM;
break;
case GST_RIFF_INFO_ISBJ:
type = GST_TAG_ALBUM_ARTIST;
break;
case GST_RIFF_INFO_ISFT:
type = GST_TAG_ENCODER;
break;
case GST_RIFF_INFO_ISHP:
type = NULL; /*"Sharpness"; */
break;
case GST_RIFF_INFO_ISRC:
type = GST_TAG_ISRC;
break;
case GST_RIFF_INFO_ISRF:
type = NULL; /*"Source Form"; */
break;
case GST_RIFF_INFO_ITCH:
type = NULL; /*"Technician"; */
break;
case GST_RIFF_INFO_ITRK:
type = GST_TAG_TRACK_NUMBER;
break;
default:
type = NULL;
GST_WARNING_OBJECT (element,
"Unknown INFO (metadata) tag entry %" GST_FOURCC_FORMAT,
GST_FOURCC_ARGS (tag));
break;
}
if (type != NULL && ptr[0] != '\0') {
GST_DEBUG_OBJECT (element, "mapped tag %" GST_FOURCC_FORMAT " to tag %s",
GST_FOURCC_ARGS (tag), type);
parse_tag_value (element, taglist, type, ptr, tsize);
}
if (tsize & 1) {
tsize++;
if (tsize > left)
tsize = left;
}
ptr += tsize;
left -= tsize;
}
if (!gst_tag_list_is_empty (taglist)) {
GST_INFO_OBJECT (element, "extracted tags: %" GST_PTR_FORMAT, taglist);
*_taglist = taglist;
} else {
*_taglist = NULL;
gst_tag_list_unref (taglist);
}
gst_buffer_unmap (buf, &info);
return;
}