Return-Path: From: Andrzej Kaczmarek To: linux-bluetooth@vger.kernel.org Cc: Andrzej Kaczmarek Subject: [PATCH v2 20/22] monitor/a2dp: Decode AAC capabilities Date: Fri, 20 Nov 2015 15:13:38 +0100 Message-Id: <1448028820-25330-21-git-send-email-andrzej.kaczmarek@codecoup.pl> In-Reply-To: <1448028820-25330-1-git-send-email-andrzej.kaczmarek@codecoup.pl> References: <1448028820-25330-1-git-send-email-andrzej.kaczmarek@codecoup.pl> Sender: linux-bluetooth-owner@vger.kernel.org List-ID: > ACL Data RX: Handle 12 flags 0x02 dlen 22 4.565591 Channel: 67 len 18 [PSM 25 mode 0] {chan 1} AVDTP: Get Capabilities (0x02) Response Accept (0x02) type 0x00 label 4 nosp 0 Service Category: Media Transport (0x01) Service Category: Media Codec (0x07) Media Type: Audio (0x00) Media Codec: MPEG-2,4 AAC (0x02) Object Type: 0xc0 MPEG-2 AAC LC MPEG-4 AAC LC Frequency: 0x180 44100 48000 Channels: 0x0c 1 2 Bitrate: 320000bps VBR: Yes Service Category: Content Protection (0x04) Content Protection Type: SCMS-T (0x0002) --- monitor/a2dp.c | 124 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 124 insertions(+) diff --git a/monitor/a2dp.c b/monitor/a2dp.c index effdfe7..51fffd4 100644 --- a/monitor/a2dp.c +++ b/monitor/a2dp.c @@ -132,6 +132,40 @@ static const struct bit_desc mpeg12_bitrate_table[] = { { } }; +static const struct bit_desc aac_object_type_table[] = { + { 7, "MPEG-2 AAC LC" }, + { 6, "MPEG-4 AAC LC" }, + { 5, "MPEG-4 AAC LTP" }, + { 4, "MPEG-4 AAC scalable" }, + { 3, "RFA (b3)" }, + { 2, "RFA (b2)" }, + { 1, "RFA (b1)" }, + { 0, "RFA (b0)" }, + { } +}; + +static const struct bit_desc aac_frequency_table[] = { + { 15, "8000" }, + { 14, "11025" }, + { 13, "12000" }, + { 12, "16000" }, + { 11, "22050" }, + { 10, "24000" }, + { 9, "32000" }, + { 8, "44100" }, + { 7, "48000" }, + { 6, "64000" }, + { 5, "88200" }, + { 4, "96000" }, + { } +}; + +static const struct bit_desc aac_channels_table[] = { + { 3, "1" }, + { 2, "2" }, + { } +}; + static void print_value_bits(uint8_t indent, uint32_t value, const struct bit_desc *table) { @@ -338,6 +372,92 @@ static bool codec_mpeg12_cfg(uint8_t losc, struct l2cap_frame *frame) return true; } +static bool codec_aac_cap(uint8_t losc, struct l2cap_frame *frame) +{ + uint16_t cap = 0; + uint8_t type; + uint16_t freq; + uint8_t chan; + uint32_t bitrate; + bool vbr; + + if (losc != 6) + return false; + + l2cap_frame_get_be16(frame, &cap); + + type = cap >> 8; + freq = cap << 8; + + l2cap_frame_get_be16(frame, &cap); + + freq |= (cap >> 8) & 0xf0; + chan = (cap >> 8) & 0x0c; + bitrate = (cap << 16) & 0x7f0000; + vbr = cap & 0x0080; + + l2cap_frame_get_be16(frame, &cap); + + bitrate |= cap; + + print_field("%*cObject Type: 0x%02x", BASE_INDENT, ' ', type); + print_value_bits(BASE_INDENT, type, aac_object_type_table); + + print_field("%*cFrequency: 0x%02x", BASE_INDENT, ' ', freq); + print_value_bits(BASE_INDENT, freq, aac_frequency_table); + + print_field("%*cChannels: 0x%02x", BASE_INDENT, ' ', chan); + print_value_bits(BASE_INDENT, chan, aac_channels_table); + + print_field("%*cBitrate: %ubps", BASE_INDENT, ' ', bitrate); + print_field("%*cVBR: %s", BASE_INDENT, ' ', vbr ? "Yes" : "No"); + + return true; +} + +static bool codec_aac_cfg(uint8_t losc, struct l2cap_frame *frame) +{ + uint16_t cap = 0; + uint8_t type; + uint16_t freq; + uint8_t chan; + uint32_t bitrate; + bool vbr; + + if (losc != 6) + return false; + + l2cap_frame_get_be16(frame, &cap); + + type = cap >> 8; + freq = cap << 8; + + l2cap_frame_get_be16(frame, &cap); + + freq |= (cap >> 8) & 0xf0; + chan = (cap >> 8) & 0x0c; + bitrate = (cap << 16) & 0x7f0000; + vbr = cap & 0x0080; + + l2cap_frame_get_be16(frame, &cap); + + bitrate |= cap; + + print_field("%*cObject Type: %s (0x%02x)", BASE_INDENT, ' ', + find_value_bit(type, aac_object_type_table), type); + + print_field("%*cFrequency: %s (0x%02x)", BASE_INDENT, ' ', + find_value_bit(freq, aac_frequency_table), freq); + + print_field("%*cChannels: %s (0x%02x)", BASE_INDENT, ' ', + find_value_bit(chan, aac_channels_table), chan); + + print_field("%*cBitrate: %ubps", BASE_INDENT, ' ', bitrate); + print_field("%*cVBR: %s", BASE_INDENT, ' ', vbr ? "Yes" : "No"); + + return true; +} + bool a2dp_codec_cap(uint8_t codec, uint8_t losc, struct l2cap_frame *frame) { switch (codec) { @@ -345,6 +465,8 @@ bool a2dp_codec_cap(uint8_t codec, uint8_t losc, struct l2cap_frame *frame) return codec_sbc_cap(losc, frame); case A2DP_CODEC_MPEG12: return codec_mpeg12_cap(losc, frame); + case A2DP_CODEC_MPEG24: + return codec_aac_cap(losc, frame); default: packet_hexdump(frame->data, losc); l2cap_frame_pull(frame, frame, losc); @@ -359,6 +481,8 @@ bool a2dp_codec_cfg(uint8_t codec, uint8_t losc, struct l2cap_frame *frame) return codec_sbc_cfg(losc, frame); case A2DP_CODEC_MPEG12: return codec_mpeg12_cfg(losc, frame); + case A2DP_CODEC_MPEG24: + return codec_aac_cfg(losc, frame); default: packet_hexdump(frame->data, losc); l2cap_frame_pull(frame, frame, losc); -- 2.6.2