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qtdemux: Ensure that raw audio and video have properly aligned buffers

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That is, aligned to the basic type for audio and to 32 bytes for video.
Fixes crashes if the raw buffers are passed to SIMD processing functions.

https://bugzilla.gnome.org/show_bug.cgi?id=774428
This commit is contained in:
Sebastian Dröge 2016-11-20 13:08:27 +02:00
parent 7fb278d7d2
commit bb35f15d44
1 changed files with 69 additions and 0 deletions
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69
gst/isomp4/qtdemux.c
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@ -298,6 +298,8 @@ struct _QtDemuxStream
GstAllocator *allocator;
GstAllocationParams params;
gsize alignment;
/* when a discontinuity is pending */
gboolean discont;
@ -1848,6 +1850,7 @@ _create_stream (void)
stream->n_samples_moof = 0;
stream->duration_moof = 0;
stream->duration_last_moof = 0;
stream->alignment = 1;
g_queue_init (&stream->protection_scheme_event_queue);
return stream;
}
@ -5127,6 +5130,44 @@ clipped:
}
}
static GstBuffer *
gst_qtdemux_align_buffer (GstQTDemux * demux,
GstBuffer * buffer, gsize alignment)
{
GstMapInfo map;
gst_buffer_map (buffer, &map, GST_MAP_READ);
if (map.size < sizeof (guintptr)) {
gst_buffer_unmap (buffer, &map);
return buffer;
}
if (((guintptr) map.data) & (alignment - 1)) {
GstBuffer *new_buffer;
GstAllocationParams params = { 0, alignment - 1, 0, 0, };
new_buffer = gst_buffer_new_allocate (NULL,
gst_buffer_get_size (buffer), &params);
/* Copy data "by hand", so ensure alignment is kept: */
gst_buffer_fill (new_buffer, 0, map.data, map.size);
gst_buffer_copy_into (new_buffer, buffer, GST_BUFFER_COPY_METADATA, 0, -1);
GST_DEBUG_OBJECT (demux,
"We want output aligned on %" G_GSIZE_FORMAT ", reallocated",
alignment);
gst_buffer_unmap (buffer, &map);
gst_buffer_unref (buffer);
return new_buffer;
}
gst_buffer_unmap (buffer, &map);
return buffer;
}
/* the input buffer metadata must be writable,
* but time/duration etc not yet set and need not be preserved */
static GstBuffer *
@ -5248,6 +5289,8 @@ gst_qtdemux_decorate_and_push_buffer (GstQTDemux * qtdemux,
GST_BUFFER_FLAG_UNSET (buf, GST_BUFFER_FLAG_DISCONT);
}
if (stream->alignment > 1)
buffer = gst_qtdemux_align_buffer (qtdemux, buffer, stream->alignment);
gst_pad_push (stream->pad, buffer);
stream->buffers = g_slist_delete_link (stream->buffers, stream->buffers);
@ -5351,6 +5394,9 @@ gst_qtdemux_decorate_and_push_buffer (GstQTDemux * qtdemux,
}
}
if (stream->alignment > 1)
buf = gst_qtdemux_align_buffer (qtdemux, buf, stream->alignment);
ret = gst_pad_push (stream->pad, buf);
if (GST_CLOCK_TIME_IS_VALID (pts) && GST_CLOCK_TIME_IS_VALID (duration)) {
@ -13137,6 +13183,7 @@ qtdemux_video_caps (GstQTDemux * qtdemux, QtDemuxStream * stream,
caps = gst_caps_new_empty_simple ("video/x-raw");
gst_caps_set_simple (caps, "format", G_TYPE_STRING, "RGB8P", NULL);
_codec ("Windows Raw RGB");
stream->alignment = 32;
break;
case FOURCC_raw_:
{
@ -13500,11 +13547,24 @@ qtdemux_video_caps (GstQTDemux * qtdemux, QtDemuxStream * stream,
/* enable clipping for raw video streams */
stream->need_clip = TRUE;
stream->alignment = 32;
}
return caps;
}
static guint
round_up_pow2 (guint n)
{
n = n - 1;
n = n | (n >> 1);
n = n | (n >> 2);
n = n | (n >> 4);
n = n | (n >> 8);
n = n | (n >> 16);
return n + 1;
}
static GstCaps *
qtdemux_audio_caps (GstQTDemux * qtdemux, QtDemuxStream * stream,
guint32 fourcc, const guint8 * data, int len, gchar ** codec_name)
@ -13547,6 +13607,8 @@ qtdemux_audio_caps (GstQTDemux * qtdemux, QtDemuxStream * stream,
caps = gst_caps_new_simple ("audio/x-raw",
"format", G_TYPE_STRING, gst_audio_format_to_string (format),
"layout", G_TYPE_STRING, "interleaved", NULL);
stream->alignment = GST_ROUND_UP_8 (depth);
stream->alignment = round_up_pow2 (stream->alignment);
break;
}
case GST_MAKE_FOURCC ('f', 'l', '6', '4'):
@ -13554,12 +13616,14 @@ qtdemux_audio_caps (GstQTDemux * qtdemux, QtDemuxStream * stream,
caps = gst_caps_new_simple ("audio/x-raw",
"format", G_TYPE_STRING, "F64BE",
"layout", G_TYPE_STRING, "interleaved", NULL);
stream->alignment = 8;
break;
case GST_MAKE_FOURCC ('f', 'l', '3', '2'):
_codec ("Raw 32-bit floating-point audio");
caps = gst_caps_new_simple ("audio/x-raw",
"format", G_TYPE_STRING, "F32BE",
"layout", G_TYPE_STRING, "interleaved", NULL);
stream->alignment = 4;
break;
case FOURCC_in24:
_codec ("Raw 24-bit PCM audio");
@ -13568,12 +13632,14 @@ qtdemux_audio_caps (GstQTDemux * qtdemux, QtDemuxStream * stream,
caps = gst_caps_new_simple ("audio/x-raw",
"format", G_TYPE_STRING, "S24BE",
"layout", G_TYPE_STRING, "interleaved", NULL);
stream->alignment = 4;
break;
case GST_MAKE_FOURCC ('i', 'n', '3', '2'):
_codec ("Raw 32-bit PCM audio");
caps = gst_caps_new_simple ("audio/x-raw",
"format", G_TYPE_STRING, "S32BE",
"layout", G_TYPE_STRING, "interleaved", NULL);
stream->alignment = 4;
break;
case FOURCC_ulaw:
_codec ("Mu-law audio");
@ -13753,6 +13819,8 @@ qtdemux_audio_caps (GstQTDemux * qtdemux, QtDemuxStream * stream,
"format", G_TYPE_STRING, gst_audio_format_to_string (format),
"layout", G_TYPE_STRING, (flags & FLAG_IS_NON_INTERLEAVED) ?
"non-interleaved" : "interleaved", NULL);
stream->alignment = GST_ROUND_UP_8 (depth);
stream->alignment = round_up_pow2 (stream->alignment);
} else {
if (width == 0)
width = 32;
@ -13771,6 +13839,7 @@ qtdemux_audio_caps (GstQTDemux * qtdemux, QtDemuxStream * stream,
"format", G_TYPE_STRING, gst_audio_format_to_string (format),
"layout", G_TYPE_STRING, (flags & FLAG_IS_NON_INTERLEAVED) ?
"non-interleaved" : "interleaved", NULL);
stream->alignment = width / 8;
}
break;
}