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qtdemux: Invent AAC codec_data if none is present

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Without, raw AAC can't be handled and we have some information available in
the decoder that most likely allows us to decode the stream in one way or
another. This is the same code already used by matroskademux for the same
reasons, and ffmpeg/vlc play such files just fine too by guesswork.
This commit is contained in:
Sebastian Dröge 2016-07-04 16:55:32 +02:00
parent 5b24841f66
commit df454fa28f
1 changed files with 49 additions and 0 deletions
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49
gst/isomp4/qtdemux.c
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@ -12669,6 +12669,55 @@ gst_qtdemux_handle_esds (GstQTDemux * qtdemux, QtDemuxStream * stream,
if (data_ptr != NULL && data_len >= 2) {
gst_codec_utils_aac_caps_set_level_and_profile (stream->caps,
data_ptr, data_len);
} else {
const gchar *profile_str = NULL;
GstBuffer *buffer;
GstMapInfo map;
guint8 *codec_data;
gint rate_idx, profile;
/* No codec_data, let's invent something.
* FIXME: This is wrong for SBR! */
GST_WARNING_OBJECT (qtdemux, "No codec_data for AAC available");
buffer = gst_buffer_new_and_alloc (2);
gst_buffer_map (buffer, &map, GST_MAP_WRITE);
codec_data = map.data;
rate_idx =
gst_codec_utils_aac_get_index_from_sample_rate (stream->rate);
switch (object_type_id) {
case 0x66:
profile_str = "main";
profile = 0;
break;
case 67:
profile_str = "lc";
profile = 1;
break;
case 68:
profile_str = "ssr";
profile = 2;
break;
default:
profile = 3;
break;
}
codec_data[0] = ((profile + 1) << 3) | ((rate_idx & 0xE) >> 1);
codec_data[1] = ((rate_idx & 0x1) << 7) | (stream->n_channels << 3);
gst_buffer_unmap (buffer, &map);
gst_caps_set_simple (stream->caps, "codec_data", GST_TYPE_BUFFER,
buffer, NULL);
gst_buffer_unref (buffer);
if (profile_str) {
gst_caps_set_simple (stream->caps, "profile", G_TYPE_STRING,
profile_str, NULL);
}
}
break;
case 0x60: /* MPEG-2, various profiles */