534 lines
14 KiB
C
534 lines
14 KiB
C
/* Copyright (c) 2011 Xiph.Org Foundation
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Written by Jean-Marc Valin */
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/*
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "opus/opus_config.h"
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#include "opus/opus_multistream.h"
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#include "opus/opus.h"
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#include "opus/opus_private.h"
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#include "opus/celt/stack_alloc.h"
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#include <stdarg.h>
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#include "opus/celt/float_cast.h"
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#include "opus/celt/os_support.h"
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struct OpusMSDecoder {
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ChannelLayout layout;
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/* Decoder states go here */
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};
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/* DECODER */
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opus_int32 opus_multistream_decoder_get_size(int nb_streams, int nb_coupled_streams)
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{
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int coupled_size;
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int mono_size;
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if(nb_streams<1||nb_coupled_streams>nb_streams||nb_coupled_streams<0)return 0;
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coupled_size = opus_decoder_get_size(2);
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mono_size = opus_decoder_get_size(1);
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return align(sizeof(OpusMSDecoder))
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+ nb_coupled_streams * align(coupled_size)
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+ (nb_streams-nb_coupled_streams) * align(mono_size);
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}
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int opus_multistream_decoder_init(
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OpusMSDecoder *st,
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opus_int32 Fs,
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int channels,
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int streams,
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int coupled_streams,
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const unsigned char *mapping
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)
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{
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int coupled_size;
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int mono_size;
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int i, ret;
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char *ptr;
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if ((channels>255) || (channels<1) || (coupled_streams>streams) ||
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(streams<1) || (coupled_streams<0) || (streams>255-coupled_streams))
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return OPUS_BAD_ARG;
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st->layout.nb_channels = channels;
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st->layout.nb_streams = streams;
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st->layout.nb_coupled_streams = coupled_streams;
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for (i=0;i<st->layout.nb_channels;i++)
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st->layout.mapping[i] = mapping[i];
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if (!validate_layout(&st->layout))
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return OPUS_BAD_ARG;
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ptr = (char*)st + align(sizeof(OpusMSDecoder));
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coupled_size = opus_decoder_get_size(2);
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mono_size = opus_decoder_get_size(1);
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for (i=0;i<st->layout.nb_coupled_streams;i++)
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{
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ret=opus_decoder_init((OpusDecoder*)ptr, Fs, 2);
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if(ret!=OPUS_OK)return ret;
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ptr += align(coupled_size);
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}
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for (;i<st->layout.nb_streams;i++)
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{
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ret=opus_decoder_init((OpusDecoder*)ptr, Fs, 1);
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if(ret!=OPUS_OK)return ret;
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ptr += align(mono_size);
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}
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return OPUS_OK;
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}
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OpusMSDecoder *opus_multistream_decoder_create(
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opus_int32 Fs,
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int channels,
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int streams,
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int coupled_streams,
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const unsigned char *mapping,
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int *error
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)
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{
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int ret;
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OpusMSDecoder *st;
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if ((channels>255) || (channels<1) || (coupled_streams>streams) ||
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(streams<1) || (coupled_streams<0) || (streams>255-coupled_streams))
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{
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if (error)
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*error = OPUS_BAD_ARG;
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return NULL;
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}
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st = (OpusMSDecoder *)opus_alloc(opus_multistream_decoder_get_size(streams, coupled_streams));
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if (st==NULL)
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{
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if (error)
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*error = OPUS_ALLOC_FAIL;
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return NULL;
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}
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ret = opus_multistream_decoder_init(st, Fs, channels, streams, coupled_streams, mapping);
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if (error)
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*error = ret;
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if (ret != OPUS_OK)
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{
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opus_free(st);
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st = NULL;
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}
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return st;
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}
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typedef void (*opus_copy_channel_out_func)(
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void *dst,
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int dst_stride,
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int dst_channel,
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const opus_val16 *src,
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int src_stride,
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int frame_size
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);
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static int opus_multistream_packet_validate(const unsigned char *data,
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opus_int32 len, int nb_streams, opus_int32 Fs)
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{
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int s;
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int count;
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unsigned char toc;
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opus_int16 size[48];
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int samples=0;
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opus_int32 packet_offset;
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for (s=0;s<nb_streams;s++)
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{
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int tmp_samples;
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if (len<=0)
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return OPUS_INVALID_PACKET;
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count = opus_packet_parse_impl(data, len, s!=nb_streams-1, &toc, NULL,
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size, NULL, &packet_offset);
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if (count<0)
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return count;
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tmp_samples = opus_packet_get_nb_samples(data, packet_offset, Fs);
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if (s!=0 && samples != tmp_samples)
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return OPUS_INVALID_PACKET;
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samples = tmp_samples;
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data += packet_offset;
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len -= packet_offset;
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}
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return samples;
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}
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static int opus_multistream_decode_native(
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OpusMSDecoder *st,
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const unsigned char *data,
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opus_int32 len,
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void *pcm,
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opus_copy_channel_out_func copy_channel_out,
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int frame_size,
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int decode_fec,
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int soft_clip
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)
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{
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opus_int32 Fs;
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int coupled_size;
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int mono_size;
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int s, c;
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char *ptr;
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int do_plc=0;
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VARDECL(opus_val16, buf);
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ALLOC_STACK;
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/* Limit frame_size to avoid excessive stack allocations. */
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opus_multistream_decoder_ctl(st, OPUS_GET_SAMPLE_RATE(&Fs));
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frame_size = IMIN(frame_size, Fs/25*3);
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ALLOC(buf, 2*frame_size, opus_val16);
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ptr = (char*)st + align(sizeof(OpusMSDecoder));
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coupled_size = opus_decoder_get_size(2);
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mono_size = opus_decoder_get_size(1);
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if (len==0)
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do_plc = 1;
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if (len < 0)
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{
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RESTORE_STACK;
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return OPUS_BAD_ARG;
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}
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if (!do_plc && len < 2*st->layout.nb_streams-1)
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{
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RESTORE_STACK;
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return OPUS_INVALID_PACKET;
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}
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if (!do_plc)
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{
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int ret = opus_multistream_packet_validate(data, len, st->layout.nb_streams, Fs);
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if (ret < 0)
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{
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RESTORE_STACK;
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return ret;
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} else if (ret > frame_size)
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{
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RESTORE_STACK;
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return OPUS_BUFFER_TOO_SMALL;
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}
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}
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for (s=0;s<st->layout.nb_streams;s++)
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{
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OpusDecoder *dec;
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int packet_offset, ret;
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dec = (OpusDecoder*)ptr;
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ptr += (s < st->layout.nb_coupled_streams) ? align(coupled_size) : align(mono_size);
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if (!do_plc && len<=0)
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{
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RESTORE_STACK;
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return OPUS_INTERNAL_ERROR;
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}
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packet_offset = 0;
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ret = opus_decode_native(dec, data, len, buf, frame_size, decode_fec, s!=st->layout.nb_streams-1, &packet_offset, soft_clip);
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data += packet_offset;
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len -= packet_offset;
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if (ret <= 0)
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{
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RESTORE_STACK;
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return ret;
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}
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frame_size = ret;
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if (s < st->layout.nb_coupled_streams)
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{
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int chan, prev;
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prev = -1;
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/* Copy "left" audio to the channel(s) where it belongs */
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while ( (chan = get_left_channel(&st->layout, s, prev)) != -1)
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{
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(*copy_channel_out)(pcm, st->layout.nb_channels, chan,
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buf, 2, frame_size);
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prev = chan;
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}
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prev = -1;
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/* Copy "right" audio to the channel(s) where it belongs */
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while ( (chan = get_right_channel(&st->layout, s, prev)) != -1)
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{
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(*copy_channel_out)(pcm, st->layout.nb_channels, chan,
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buf+1, 2, frame_size);
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prev = chan;
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}
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} else {
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int chan, prev;
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prev = -1;
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/* Copy audio to the channel(s) where it belongs */
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while ( (chan = get_mono_channel(&st->layout, s, prev)) != -1)
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{
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(*copy_channel_out)(pcm, st->layout.nb_channels, chan,
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buf, 1, frame_size);
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prev = chan;
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}
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}
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}
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/* Handle muted channels */
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for (c=0;c<st->layout.nb_channels;c++)
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{
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if (st->layout.mapping[c] == 255)
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{
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(*copy_channel_out)(pcm, st->layout.nb_channels, c,
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NULL, 0, frame_size);
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}
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}
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RESTORE_STACK;
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return frame_size;
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}
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#if !defined(DISABLE_FLOAT_API)
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static void opus_copy_channel_out_float(
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void *dst,
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int dst_stride,
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int dst_channel,
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const opus_val16 *src,
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int src_stride,
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int frame_size
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)
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{
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float *float_dst;
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opus_int32 i;
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float_dst = (float*)dst;
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if (src != NULL)
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{
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for (i=0;i<frame_size;i++)
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#if defined(FIXED_POINT)
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float_dst[i*dst_stride+dst_channel] = (1/32768.f)*src[i*src_stride];
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#else
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float_dst[i*dst_stride+dst_channel] = src[i*src_stride];
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#endif
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}
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else
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{
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for (i=0;i<frame_size;i++)
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float_dst[i*dst_stride+dst_channel] = 0;
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}
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}
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#endif
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static void opus_copy_channel_out_short(
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void *dst,
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int dst_stride,
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int dst_channel,
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const opus_val16 *src,
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int src_stride,
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int frame_size
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)
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{
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opus_int16 *short_dst;
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opus_int32 i;
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short_dst = (opus_int16*)dst;
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if (src != NULL)
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{
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for (i=0;i<frame_size;i++)
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#if defined(FIXED_POINT)
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short_dst[i*dst_stride+dst_channel] = src[i*src_stride];
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#else
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short_dst[i*dst_stride+dst_channel] = FLOAT2INT16(src[i*src_stride]);
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#endif
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}
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else
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{
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for (i=0;i<frame_size;i++)
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short_dst[i*dst_stride+dst_channel] = 0;
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}
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}
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#ifdef OPUS_FIXED_POINT
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int opus_multistream_decode(
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OpusMSDecoder *st,
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const unsigned char *data,
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opus_int32 len,
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opus_int16 *pcm,
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int frame_size,
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int decode_fec
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)
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{
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return opus_multistream_decode_native(st, data, len,
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pcm, opus_copy_channel_out_short, frame_size, decode_fec, 0);
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}
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#ifndef DISABLE_FLOAT_API
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int opus_multistream_decode_float(OpusMSDecoder *st, const unsigned char *data,
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opus_int32 len, float *pcm, int frame_size, int decode_fec)
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{
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return opus_multistream_decode_native(st, data, len,
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pcm, opus_copy_channel_out_float, frame_size, decode_fec, 0);
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}
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#endif
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#else
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int opus_multistream_decode(OpusMSDecoder *st, const unsigned char *data,
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opus_int32 len, opus_int16 *pcm, int frame_size, int decode_fec)
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{
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return opus_multistream_decode_native(st, data, len,
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pcm, opus_copy_channel_out_short, frame_size, decode_fec, 1);
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}
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int opus_multistream_decode_float(
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OpusMSDecoder *st,
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const unsigned char *data,
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opus_int32 len,
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float *pcm,
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int frame_size,
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int decode_fec
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)
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{
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return opus_multistream_decode_native(st, data, len,
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pcm, opus_copy_channel_out_float, frame_size, decode_fec, 0);
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}
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#endif
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int opus_multistream_decoder_ctl(OpusMSDecoder *st, int request, ...)
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{
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va_list ap;
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int coupled_size, mono_size;
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char *ptr;
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int ret = OPUS_OK;
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va_start(ap, request);
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coupled_size = opus_decoder_get_size(2);
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mono_size = opus_decoder_get_size(1);
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ptr = (char*)st + align(sizeof(OpusMSDecoder));
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switch (request)
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{
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case OPUS_GET_BANDWIDTH_REQUEST:
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case OPUS_GET_SAMPLE_RATE_REQUEST:
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case OPUS_GET_GAIN_REQUEST:
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case OPUS_GET_LAST_PACKET_DURATION_REQUEST:
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{
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OpusDecoder *dec;
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/* For int32* GET params, just query the first stream */
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opus_int32 *value = va_arg(ap, opus_int32*);
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dec = (OpusDecoder*)ptr;
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ret = opus_decoder_ctl(dec, request, value);
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}
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break;
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case OPUS_GET_FINAL_RANGE_REQUEST:
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{
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int s;
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opus_uint32 *value = va_arg(ap, opus_uint32*);
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opus_uint32 tmp;
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if (!value)
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{
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goto bad_arg;
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}
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*value = 0;
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for (s=0;s<st->layout.nb_streams;s++)
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{
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OpusDecoder *dec;
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dec = (OpusDecoder*)ptr;
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if (s < st->layout.nb_coupled_streams)
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ptr += align(coupled_size);
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else
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ptr += align(mono_size);
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ret = opus_decoder_ctl(dec, request, &tmp);
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if (ret != OPUS_OK) break;
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*value ^= tmp;
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}
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}
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break;
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case OPUS_RESET_STATE:
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{
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int s;
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for (s=0;s<st->layout.nb_streams;s++)
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{
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OpusDecoder *dec;
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dec = (OpusDecoder*)ptr;
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if (s < st->layout.nb_coupled_streams)
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ptr += align(coupled_size);
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else
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ptr += align(mono_size);
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ret = opus_decoder_ctl(dec, OPUS_RESET_STATE);
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if (ret != OPUS_OK)
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break;
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}
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}
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break;
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case OPUS_MULTISTREAM_GET_DECODER_STATE_REQUEST:
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{
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int s;
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opus_int32 stream_id;
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OpusDecoder **value;
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stream_id = va_arg(ap, opus_int32);
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if (stream_id<0 || stream_id >= st->layout.nb_streams)
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ret = OPUS_BAD_ARG;
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value = va_arg(ap, OpusDecoder**);
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if (!value)
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{
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goto bad_arg;
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}
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for (s=0;s<stream_id;s++)
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{
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if (s < st->layout.nb_coupled_streams)
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ptr += align(coupled_size);
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else
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ptr += align(mono_size);
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}
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*value = (OpusDecoder*)ptr;
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}
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break;
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case OPUS_SET_GAIN_REQUEST:
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{
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int s;
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/* This works for int32 params */
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opus_int32 value = va_arg(ap, opus_int32);
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for (s=0;s<st->layout.nb_streams;s++)
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{
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OpusDecoder *dec;
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dec = (OpusDecoder*)ptr;
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if (s < st->layout.nb_coupled_streams)
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ptr += align(coupled_size);
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else
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ptr += align(mono_size);
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ret = opus_decoder_ctl(dec, request, value);
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if (ret != OPUS_OK)
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break;
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}
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}
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break;
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default:
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ret = OPUS_UNIMPLEMENTED;
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break;
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}
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va_end(ap);
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return ret;
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bad_arg:
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va_end(ap);
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return OPUS_BAD_ARG;
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}
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void opus_multistream_decoder_destroy(OpusMSDecoder *st)
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{
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opus_free(st);
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}
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