From 9a066e548ddd6da12de29bd8cfe2f084767c2e82 Mon Sep 17 00:00:00 2001 From: Edward Hervey Date: Thu, 6 Apr 2017 12:01:00 +0200 Subject: [PATCH] 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 --- gst/audioparsers/gstaacparse.c | 56 ++++++++++++++++++++++++------------------ 1 file changed, 32 insertions(+), 24 deletions(-) diff --git a/gst/audioparsers/gstaacparse.c b/gst/audioparsers/gstaacparse.c index 21b8c8c..cabd961 100644 --- a/gst/audioparsers/gstaacparse.c +++ b/gst/audioparsers/gstaacparse.c @@ -100,6 +100,11 @@ static GstFlowReturn gst_aac_parse_pre_push_frame (GstBaseParse * parse, static gboolean gst_aac_parse_src_event (GstBaseParse * parse, GstEvent * event); +static gboolean gst_aac_parse_read_audio_specific_config (GstAacParse * + aacparse, GstBitReader * br, gint * object_type, gint * sample_rate, + gint * channels, gint * frame_samples); + + #define gst_aac_parse_parent_class parent_class G_DEFINE_TYPE (GstAacParse, gst_aac_parse, GST_TYPE_BASE_PARSE); @@ -308,25 +313,17 @@ gst_aac_parse_sink_setcaps (GstBaseParse * parse, GstCaps * caps) if (buf && gst_buffer_get_size (buf) >= 2) { GstMapInfo map; - guint sr_idx; + GstBitReader br; if (!gst_buffer_map (buf, &map, GST_MAP_READ)) return FALSE; + gst_bit_reader_init (&br, map.data, map.size); + gst_aac_parse_read_audio_specific_config (aacparse, &br, + &aacparse->object_type, &aacparse->sample_rate, &aacparse->channels, + &aacparse->frame_samples); - sr_idx = ((map.data[0] & 0x07) << 1) | ((map.data[1] & 0x80) >> 7); - aacparse->object_type = (map.data[0] & 0xf8) >> 3; - aacparse->sample_rate = - gst_codec_utils_aac_get_sample_rate_from_index (sr_idx); - aacparse->channels = (map.data[1] & 0x78) >> 3; - if (aacparse->channels == 7) - aacparse->channels = 8; - else if (aacparse->channels == 11) - aacparse->channels = 7; - else if (aacparse->channels == 12 || aacparse->channels == 14) - aacparse->channels = 8; aacparse->header_type = DSPAAC_HEADER_NONE; aacparse->mpegversion = 4; - aacparse->frame_samples = (map.data[1] & 4) ? 960 : 1024; gst_buffer_unmap (buf, &map); GST_DEBUG ("codec_data: object_type=%d, sample_rate=%d, channels=%d, " @@ -540,8 +537,9 @@ gst_aac_parse_get_audio_sample_rate (GstAacParse * aacparse, GstBitReader * br, /* See table 1.13 in ISO/IEC 14496-3 */ static gboolean -gst_aac_parse_read_loas_audio_specific_config (GstAacParse * aacparse, - GstBitReader * br, gint * sample_rate, gint * channels, guint32 * bits) +gst_aac_parse_read_audio_specific_config (GstAacParse * aacparse, + GstBitReader * br, gint * object_type, gint * sample_rate, gint * channels, + gint * frame_samples) { guint8 audio_object_type; guint8 G_GNUC_UNUSED extension_audio_object_type; @@ -550,6 +548,8 @@ gst_aac_parse_read_loas_audio_specific_config (GstAacParse * aacparse, if (!gst_aac_parse_get_audio_object_type (aacparse, br, &audio_object_type)) return FALSE; + if (object_type) + *object_type = audio_object_type; if (!gst_aac_parse_get_audio_sample_rate (aacparse, br, sample_rate)) return FALSE; @@ -573,7 +573,8 @@ gst_aac_parse_read_loas_audio_specific_config (GstAacParse * aacparse, } GST_LOG_OBJECT (aacparse, - "Audio object type 5 or 29, so rereading sampling rate..."); + "Audio object type 5 or 29, so rereading sampling rate (was %d)...", + *sample_rate); if (!gst_aac_parse_get_audio_sample_rate (aacparse, br, sample_rate)) return FALSE; @@ -595,15 +596,23 @@ gst_aac_parse_read_loas_audio_specific_config (GstAacParse * aacparse, extension_audio_object_type = 0; } - GST_INFO_OBJECT (aacparse, "Found LOAS config: %d Hz, %d channels", + GST_INFO_OBJECT (aacparse, "Parsed AudioSpecificConfig: %d Hz, %d channels", *sample_rate, *channels); + if (frame_samples && audio_object_type == 23) { + guint8 frame_flag; + /* Read the Decoder Configuration (GASpecificConfig) if present */ + /* We only care about the first bit to know what the number of samples + * in a frame is */ + if (!gst_bit_reader_get_bits_uint8 (br, &frame_flag, 1)) + return FALSE; + *frame_samples = frame_flag ? 960 : 1024; + } + /* There's LOTS of stuff next, but we ignore it for now as we have what we want (sample rate and number of channels */ GST_DEBUG_OBJECT (aacparse, "Need more code to parse humongous LOAS data, currently ignored"); - if (bits) - *bits = 0; aacparse->last_parsed_channels = *channels; return TRUE; } @@ -687,17 +696,16 @@ gst_aac_parse_read_loas_config (GstAacParse * aacparse, const guint8 * data, } if (!use_same_config) { if (v == 0) { - if (!gst_aac_parse_read_loas_audio_specific_config (aacparse, &br, + if (!gst_aac_parse_read_audio_specific_config (aacparse, &br, NULL, sample_rate, channels, NULL)) return FALSE; } else { - guint32 bits, asc_len; + guint32 asc_len; if (!gst_aac_parse_latm_get_value (aacparse, &br, &asc_len)) return FALSE; - if (!gst_aac_parse_read_loas_audio_specific_config (aacparse, &br, - sample_rate, channels, &bits)) + if (!gst_aac_parse_read_audio_specific_config (aacparse, &br, NULL, + sample_rate, channels, NULL)) return FALSE; - asc_len -= bits; if (!gst_bit_reader_skip (&br, asc_len)) return FALSE; } -- 2.7.4