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aacparse: streamline and improve AudioSpecificConfig parsing
AudioSpecifigConfig is used in a variety of AAC streams but was being parsed differently. Instead, make everyone use the same parsing. * Remove unused 'bits' field (it was always set to 0 if present) * Add proper GAConfig parsing (to know the number of samples per frame if present). Fixes wrong rate/channels configuration in streams coming from qtdemux https://bugzilla.gnome.org/show_bug.cgi?id=780966
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3342d86d9b
commit
9a066e548d
1 changed files with 32 additions and 24 deletions
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@ -100,6 +100,11 @@ static GstFlowReturn gst_aac_parse_pre_push_frame (GstBaseParse * parse,
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static gboolean gst_aac_parse_src_event (GstBaseParse * parse,
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GstEvent * event);
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static gboolean gst_aac_parse_read_audio_specific_config (GstAacParse *
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aacparse, GstBitReader * br, gint * object_type, gint * sample_rate,
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gint * channels, gint * frame_samples);
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#define gst_aac_parse_parent_class parent_class
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G_DEFINE_TYPE (GstAacParse, gst_aac_parse, GST_TYPE_BASE_PARSE);
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@ -308,25 +313,17 @@ gst_aac_parse_sink_setcaps (GstBaseParse * parse, GstCaps * caps)
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if (buf && gst_buffer_get_size (buf) >= 2) {
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GstMapInfo map;
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guint sr_idx;
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GstBitReader br;
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if (!gst_buffer_map (buf, &map, GST_MAP_READ))
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return FALSE;
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gst_bit_reader_init (&br, map.data, map.size);
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gst_aac_parse_read_audio_specific_config (aacparse, &br,
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&aacparse->object_type, &aacparse->sample_rate, &aacparse->channels,
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&aacparse->frame_samples);
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sr_idx = ((map.data[0] & 0x07) << 1) | ((map.data[1] & 0x80) >> 7);
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aacparse->object_type = (map.data[0] & 0xf8) >> 3;
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aacparse->sample_rate =
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gst_codec_utils_aac_get_sample_rate_from_index (sr_idx);
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aacparse->channels = (map.data[1] & 0x78) >> 3;
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if (aacparse->channels == 7)
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aacparse->channels = 8;
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else if (aacparse->channels == 11)
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aacparse->channels = 7;
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else if (aacparse->channels == 12 || aacparse->channels == 14)
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aacparse->channels = 8;
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aacparse->header_type = DSPAAC_HEADER_NONE;
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aacparse->mpegversion = 4;
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aacparse->frame_samples = (map.data[1] & 4) ? 960 : 1024;
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gst_buffer_unmap (buf, &map);
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GST_DEBUG ("codec_data: object_type=%d, sample_rate=%d, channels=%d, "
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@ -540,8 +537,9 @@ gst_aac_parse_get_audio_sample_rate (GstAacParse * aacparse, GstBitReader * br,
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/* See table 1.13 in ISO/IEC 14496-3 */
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static gboolean
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gst_aac_parse_read_loas_audio_specific_config (GstAacParse * aacparse,
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GstBitReader * br, gint * sample_rate, gint * channels, guint32 * bits)
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gst_aac_parse_read_audio_specific_config (GstAacParse * aacparse,
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GstBitReader * br, gint * object_type, gint * sample_rate, gint * channels,
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gint * frame_samples)
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{
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guint8 audio_object_type;
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guint8 G_GNUC_UNUSED extension_audio_object_type;
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@ -550,6 +548,8 @@ gst_aac_parse_read_loas_audio_specific_config (GstAacParse * aacparse,
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if (!gst_aac_parse_get_audio_object_type (aacparse, br, &audio_object_type))
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return FALSE;
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if (object_type)
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*object_type = audio_object_type;
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if (!gst_aac_parse_get_audio_sample_rate (aacparse, br, sample_rate))
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return FALSE;
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@ -573,7 +573,8 @@ gst_aac_parse_read_loas_audio_specific_config (GstAacParse * aacparse,
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}
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GST_LOG_OBJECT (aacparse,
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"Audio object type 5 or 29, so rereading sampling rate...");
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"Audio object type 5 or 29, so rereading sampling rate (was %d)...",
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*sample_rate);
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if (!gst_aac_parse_get_audio_sample_rate (aacparse, br, sample_rate))
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return FALSE;
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@ -595,15 +596,23 @@ gst_aac_parse_read_loas_audio_specific_config (GstAacParse * aacparse,
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extension_audio_object_type = 0;
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}
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GST_INFO_OBJECT (aacparse, "Found LOAS config: %d Hz, %d channels",
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GST_INFO_OBJECT (aacparse, "Parsed AudioSpecificConfig: %d Hz, %d channels",
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*sample_rate, *channels);
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if (frame_samples && audio_object_type == 23) {
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guint8 frame_flag;
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/* Read the Decoder Configuration (GASpecificConfig) if present */
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/* We only care about the first bit to know what the number of samples
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* in a frame is */
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if (!gst_bit_reader_get_bits_uint8 (br, &frame_flag, 1))
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return FALSE;
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*frame_samples = frame_flag ? 960 : 1024;
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}
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/* There's LOTS of stuff next, but we ignore it for now as we have
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what we want (sample rate and number of channels */
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GST_DEBUG_OBJECT (aacparse,
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"Need more code to parse humongous LOAS data, currently ignored");
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if (bits)
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*bits = 0;
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aacparse->last_parsed_channels = *channels;
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return TRUE;
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}
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@ -687,17 +696,16 @@ gst_aac_parse_read_loas_config (GstAacParse * aacparse, const guint8 * data,
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}
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if (!use_same_config) {
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if (v == 0) {
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if (!gst_aac_parse_read_loas_audio_specific_config (aacparse, &br,
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if (!gst_aac_parse_read_audio_specific_config (aacparse, &br, NULL,
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sample_rate, channels, NULL))
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return FALSE;
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} else {
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guint32 bits, asc_len;
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guint32 asc_len;
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if (!gst_aac_parse_latm_get_value (aacparse, &br, &asc_len))
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return FALSE;
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if (!gst_aac_parse_read_loas_audio_specific_config (aacparse, &br,
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sample_rate, channels, &bits))
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if (!gst_aac_parse_read_audio_specific_config (aacparse, &br, NULL,
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sample_rate, channels, NULL))
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return FALSE;
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asc_len -= bits;
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if (!gst_bit_reader_skip (&br, asc_len))
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return FALSE;
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}
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