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/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <netinet/in.h>
#include <sbc/sbc.h>
#include <syslog.h>
#include "cras_a2dp_info.h"
#include "cras_sbc_codec.h"
#include "cras_types.h"
#include "rtp.h"
int init_a2dp(struct a2dp_info *a2dp, a2dp_sbc_t *sbc)
{
uint8_t frequency = 0, mode = 0, subbands = 0, allocation, blocks = 0,
bitpool;
if (sbc->frequency & SBC_SAMPLING_FREQ_48000)
frequency = SBC_FREQ_48000;
else if (sbc->frequency & SBC_SAMPLING_FREQ_44100)
frequency = SBC_FREQ_44100;
else if (sbc->frequency & SBC_SAMPLING_FREQ_32000)
frequency = SBC_FREQ_32000;
else if (sbc->frequency & SBC_SAMPLING_FREQ_16000)
frequency = SBC_FREQ_16000;
if (sbc->channel_mode & SBC_CHANNEL_MODE_JOINT_STEREO)
mode = SBC_MODE_JOINT_STEREO;
else if (sbc->channel_mode & SBC_CHANNEL_MODE_STEREO)
mode = SBC_MODE_STEREO;
else if (sbc->channel_mode & SBC_CHANNEL_MODE_DUAL_CHANNEL)
mode = SBC_MODE_DUAL_CHANNEL;
else if (sbc->channel_mode & SBC_CHANNEL_MODE_MONO)
mode = SBC_MODE_MONO;
if (sbc->allocation_method & SBC_ALLOCATION_LOUDNESS)
allocation = SBC_AM_LOUDNESS;
else
allocation = SBC_AM_SNR;
switch (sbc->subbands) {
case SBC_SUBBANDS_4:
subbands = SBC_SB_4;
break;
case SBC_SUBBANDS_8:
subbands = SBC_SB_8;
break;
}
switch (sbc->block_length) {
case SBC_BLOCK_LENGTH_4:
blocks = SBC_BLK_4;
break;
case SBC_BLOCK_LENGTH_8:
blocks = SBC_BLK_8;
break;
case SBC_BLOCK_LENGTH_12:
blocks = SBC_BLK_12;
break;
case SBC_BLOCK_LENGTH_16:
blocks = SBC_BLK_16;
break;
}
bitpool = sbc->max_bitpool;
a2dp->codec = cras_sbc_codec_create(frequency, mode, subbands,
allocation, blocks, bitpool);
if (!a2dp->codec)
return -1;
/* SBC info */
a2dp->codesize = cras_sbc_get_codesize(a2dp->codec);
a2dp->frame_length = cras_sbc_get_frame_length(a2dp->codec);
a2dp->a2dp_buf_used =
sizeof(struct rtp_header) + sizeof(struct rtp_payload);
a2dp->frame_count = 0;
a2dp->seq_num = 0;
a2dp->samples = 0;
return 0;
}
void destroy_a2dp(struct a2dp_info *a2dp)
{
cras_sbc_codec_destroy(a2dp->codec);
}
int a2dp_codesize(struct a2dp_info *a2dp)
{
return a2dp->codesize;
}
int a2dp_block_size(struct a2dp_info *a2dp, int a2dp_bytes)
{
return a2dp_bytes / a2dp->frame_length * a2dp->codesize;
}
int a2dp_queued_frames(const struct a2dp_info *a2dp)
{
return a2dp->samples;
}
void a2dp_reset(struct a2dp_info *a2dp)
{
a2dp->a2dp_buf_used =
sizeof(struct rtp_header) + sizeof(struct rtp_payload);
a2dp->samples = 0;
a2dp->seq_num = 0;
a2dp->frame_count = 0;
}
static int avdtp_write(int stream_fd, struct a2dp_info *a2dp)
{
int err, samples;
struct rtp_header *header;
struct rtp_payload *payload;
header = (struct rtp_header *)a2dp->a2dp_buf;
payload = (struct rtp_payload *)(a2dp->a2dp_buf + sizeof(*header));
memset(a2dp->a2dp_buf, 0, sizeof(*header) + sizeof(*payload));
payload->frame_count = a2dp->frame_count;
header->v = 2;
header->pt = 1;
header->sequence_number = htons(a2dp->seq_num);
header->timestamp = htonl(a2dp->nsamples);
header->ssrc = htonl(1);
err = send(stream_fd, a2dp->a2dp_buf, a2dp->a2dp_buf_used,
MSG_DONTWAIT);
if (err < 0)
return -errno;
/* Returns the number of samples in frame. */
samples = a2dp->samples;
/* Reset some data */
a2dp->a2dp_buf_used = sizeof(*header) + sizeof(*payload);
a2dp->frame_count = 0;
a2dp->samples = 0;
a2dp->seq_num++;
return samples;
}
int a2dp_encode(struct a2dp_info *a2dp, const void *pcm_buf, int pcm_buf_size,
int format_bytes, size_t link_mtu)
{
int processed;
size_t out_encoded;
if (link_mtu > A2DP_BUF_SIZE_BYTES)
link_mtu = A2DP_BUF_SIZE_BYTES;
if (link_mtu == a2dp->a2dp_buf_used)
return 0;
processed = a2dp->codec->encode(a2dp->codec, pcm_buf, pcm_buf_size,
a2dp->a2dp_buf + a2dp->a2dp_buf_used,
link_mtu - a2dp->a2dp_buf_used,
&out_encoded);
if (processed < 0) {
syslog(LOG_ERR, "a2dp encode error %d", processed);
return processed;
}
if (a2dp->codesize > 0)
a2dp->frame_count += processed / a2dp->codesize;
a2dp->a2dp_buf_used += out_encoded;
a2dp->samples += processed / format_bytes;
a2dp->nsamples += processed / format_bytes;
return processed;
}
int a2dp_write(struct a2dp_info *a2dp, int stream_fd, size_t link_mtu)
{
/* Do avdtp write when the max number of SBC frames is reached. */
if (a2dp->a2dp_buf_used + a2dp->frame_length > link_mtu)
return avdtp_write(stream_fd, a2dp);
return 0;
}
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