150 lines
5.9 KiB
C
150 lines
5.9 KiB
C
/*
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* Copyright 2020 sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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* Author: Pau Espin Pedrol <pespin@sysmocom.de>
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*
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* SPDX-License-Identifier: 0BSD
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*
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* Permission to use, copy, modify, and/or distribute this software for any purpose
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* with or without fee is hereby granted.THE SOFTWARE IS PROVIDED "AS IS" AND THE
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* AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR
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* BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
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* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE
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* USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <stdint.h>
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#include <stddef.h>
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#include <osmocom/core/talloc.h>
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#include "shm.h"
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#define ENCDECDEBUG(...) //fprintf(stderr, __VA_ARGS__)
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/* Convert offsets to pointers */
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struct ipc_shm_stream *ipc_shm_decode_stream(void *tall_ctx, struct ipc_shm_raw_region *root_raw,
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struct ipc_shm_raw_stream *stream_raw)
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{
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unsigned int i;
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struct ipc_shm_stream *stream;
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stream = talloc_zero(tall_ctx, struct ipc_shm_stream);
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stream = talloc_zero_size(tall_ctx, sizeof(struct ipc_shm_stream) +
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sizeof(struct ipc_shm_raw_smpl_buf *) * stream_raw->num_buffers);
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if (!stream)
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return NULL;
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stream->num_buffers = stream_raw->num_buffers;
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stream->buffer_size = stream_raw->buffer_size;
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stream->raw = stream_raw;
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for (i = 0; i < stream->num_buffers; i++) {
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ENCDECDEBUG("decode: smpl_buf %d at offset %u\n", i, stream_raw->buffer_offset[i]);
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stream->buffers[i] =
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(struct ipc_shm_raw_smpl_buf *)(((uint8_t *)root_raw) + stream_raw->buffer_offset[i]);
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}
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return stream;
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}
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struct ipc_shm_channel *ipc_shm_decode_channel(void *tall_ctx, struct ipc_shm_raw_region *root_raw,
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struct ipc_shm_raw_channel *chan_raw)
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{
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struct ipc_shm_channel *chan;
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chan = talloc_zero(tall_ctx, struct ipc_shm_channel);
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if (!chan)
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return NULL;
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ENCDECDEBUG("decode: streams at offset %u and %u\n", chan_raw->dl_buf_offset, chan_raw->ul_buf_offset);
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chan->dl_stream = ipc_shm_decode_stream(
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chan, root_raw, (struct ipc_shm_raw_stream *)(((uint8_t *)root_raw) + chan_raw->dl_buf_offset));
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chan->ul_stream = ipc_shm_decode_stream(
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chan, root_raw, (struct ipc_shm_raw_stream *)(((uint8_t *)root_raw) + chan_raw->ul_buf_offset));
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return chan;
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}
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struct ipc_shm_region *ipc_shm_decode_region(void *tall_ctx, struct ipc_shm_raw_region *root_raw)
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{
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unsigned int i;
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struct ipc_shm_region *root;
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root = talloc_zero_size(tall_ctx,
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sizeof(struct ipc_shm_region) + sizeof(struct ipc_shm_channel *) * root_raw->num_chans);
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if (!root)
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return NULL;
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root->num_chans = root_raw->num_chans;
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for (i = 0; i < root->num_chans; i++) {
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ENCDECDEBUG("decode: channel %d at offset %u\n", i, root_raw->chan_offset[i]);
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root->channels[i] = ipc_shm_decode_channel(
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root, root_raw,
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(struct ipc_shm_raw_channel *)(((uint8_t *)root_raw) + root_raw->chan_offset[i]));
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}
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return root;
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}
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unsigned int ipc_shm_encode_smpl_buf(struct ipc_shm_raw_region *root_raw, struct ipc_shm_raw_smpl_buf *smpl_buf_raw,
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uint32_t buffer_size)
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{
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unsigned int offset = sizeof(struct ipc_shm_raw_smpl_buf);
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offset = (((uintptr_t)offset + 7) & ~0x07ULL);
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ENCDECDEBUG("encode: smpl_buf at offset %u\n", offset);
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offset += buffer_size * sizeof(uint16_t) * 2; /* samples */
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return offset;
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}
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unsigned int ipc_shm_encode_stream(struct ipc_shm_raw_region *root_raw, struct ipc_shm_raw_stream *stream_raw,
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uint32_t num_buffers, uint32_t buffer_size)
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{
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unsigned int i;
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ptrdiff_t start = (ptrdiff_t)stream_raw;
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unsigned int offset = sizeof(struct ipc_shm_raw_stream) + sizeof(uint32_t) * num_buffers;
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offset = (((uintptr_t)offset + 7) & ~0x07ULL);
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ENCDECDEBUG("encode: stream at offset %lu\n", (start - (ptrdiff_t)root_raw));
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if (root_raw) {
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stream_raw->num_buffers = num_buffers;
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stream_raw->buffer_size = buffer_size;
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stream_raw->read_next = 0;
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stream_raw->write_next = 0;
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}
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for (i = 0; i < num_buffers; i++) {
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if (root_raw)
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stream_raw->buffer_offset[i] = (start + offset - (ptrdiff_t)root_raw);
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offset +=
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ipc_shm_encode_smpl_buf(root_raw, (struct ipc_shm_raw_smpl_buf *)(start + offset), buffer_size);
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}
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return offset;
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}
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unsigned int ipc_shm_encode_channel(struct ipc_shm_raw_region *root_raw, struct ipc_shm_raw_channel *chan_raw,
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uint32_t num_buffers, uint32_t buffer_size)
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{
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uint8_t *start = (uint8_t *)chan_raw;
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unsigned int offset = sizeof(struct ipc_shm_raw_channel);
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offset = (((uintptr_t)offset + 7) & ~0x07ULL);
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ENCDECDEBUG("encode: channel at offset %lu\n", (start - (uint8_t *)root_raw));
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if (root_raw)
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chan_raw->dl_buf_offset = (start + offset - (uint8_t *)root_raw);
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offset += ipc_shm_encode_stream(root_raw, (struct ipc_shm_raw_stream *)(start + offset), num_buffers,
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buffer_size);
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if (root_raw)
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chan_raw->ul_buf_offset = (start + offset - (uint8_t *)root_raw);
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offset += ipc_shm_encode_stream(root_raw, (struct ipc_shm_raw_stream *)(start + offset), num_buffers,
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buffer_size);
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return offset;
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}
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/* if root_raw is NULL, then do a dry run, aka only calculate final offset */
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unsigned int ipc_shm_encode_region(struct ipc_shm_raw_region *root_raw, uint32_t num_chans, uint32_t num_buffers,
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uint32_t buffer_size)
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{
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unsigned i;
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uintptr_t start = (uintptr_t)root_raw;
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unsigned int offset = sizeof(struct ipc_shm_raw_region) + sizeof(uint32_t) * num_chans;
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offset = (((uintptr_t)offset + 7) & ~0x07ULL);
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if (root_raw)
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root_raw->num_chans = num_chans;
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for (i = 0; i < num_chans; i++) {
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if (root_raw)
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root_raw->chan_offset[i] = (start + offset - (uintptr_t)root_raw);
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ENCDECDEBUG("encode: channel %d chan_offset[i]=%lu\n", i, start + offset - (uintptr_t)root_raw);
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offset += ipc_shm_encode_channel(root_raw, (struct ipc_shm_raw_channel *)(start + offset), num_buffers,
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buffer_size);
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}
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//TODO: pass maximum size and verify we didn't go through
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return offset;
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}
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