diff options
Diffstat (limited to 'media/libopus/src/opus_multistream_decoder.c')
| -rw-r--r-- | media/libopus/src/opus_multistream_decoder.c | 537 |
1 files changed, 537 insertions, 0 deletions
diff --git a/media/libopus/src/opus_multistream_decoder.c b/media/libopus/src/opus_multistream_decoder.c new file mode 100644 index 000000000..b95eaa6ea --- /dev/null +++ b/media/libopus/src/opus_multistream_decoder.c @@ -0,0 +1,537 @@ +/* Copyright (c) 2011 Xiph.Org Foundation + Written by Jean-Marc Valin */ +/* + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + - Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + - Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER + OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include "opus_multistream.h" +#include "opus.h" +#include "opus_private.h" +#include "stack_alloc.h" +#include <stdarg.h> +#include "float_cast.h" +#include "os_support.h" + +struct OpusMSDecoder { + ChannelLayout layout; + /* Decoder states go here */ +}; + + + + +/* DECODER */ + +opus_int32 opus_multistream_decoder_get_size(int nb_streams, int nb_coupled_streams) +{ + int coupled_size; + int mono_size; + + if(nb_streams<1||nb_coupled_streams>nb_streams||nb_coupled_streams<0)return 0; + coupled_size = opus_decoder_get_size(2); + mono_size = opus_decoder_get_size(1); + return align(sizeof(OpusMSDecoder)) + + nb_coupled_streams * align(coupled_size) + + (nb_streams-nb_coupled_streams) * align(mono_size); +} + +int opus_multistream_decoder_init( + OpusMSDecoder *st, + opus_int32 Fs, + int channels, + int streams, + int coupled_streams, + const unsigned char *mapping +) +{ + int coupled_size; + int mono_size; + int i, ret; + char *ptr; + + if ((channels>255) || (channels<1) || (coupled_streams>streams) || + (streams<1) || (coupled_streams<0) || (streams>255-coupled_streams)) + return OPUS_BAD_ARG; + + st->layout.nb_channels = channels; + st->layout.nb_streams = streams; + st->layout.nb_coupled_streams = coupled_streams; + + for (i=0;i<st->layout.nb_channels;i++) + st->layout.mapping[i] = mapping[i]; + if (!validate_layout(&st->layout)) + return OPUS_BAD_ARG; + + ptr = (char*)st + align(sizeof(OpusMSDecoder)); + coupled_size = opus_decoder_get_size(2); + mono_size = opus_decoder_get_size(1); + + for (i=0;i<st->layout.nb_coupled_streams;i++) + { + ret=opus_decoder_init((OpusDecoder*)ptr, Fs, 2); + if(ret!=OPUS_OK)return ret; + ptr += align(coupled_size); + } + for (;i<st->layout.nb_streams;i++) + { + ret=opus_decoder_init((OpusDecoder*)ptr, Fs, 1); + if(ret!=OPUS_OK)return ret; + ptr += align(mono_size); + } + return OPUS_OK; +} + + +OpusMSDecoder *opus_multistream_decoder_create( + opus_int32 Fs, + int channels, + int streams, + int coupled_streams, + const unsigned char *mapping, + int *error +) +{ + int ret; + OpusMSDecoder *st; + if ((channels>255) || (channels<1) || (coupled_streams>streams) || + (streams<1) || (coupled_streams<0) || (streams>255-coupled_streams)) + { + if (error) + *error = OPUS_BAD_ARG; + return NULL; + } + st = (OpusMSDecoder *)opus_alloc(opus_multistream_decoder_get_size(streams, coupled_streams)); + if (st==NULL) + { + if (error) + *error = OPUS_ALLOC_FAIL; + return NULL; + } + ret = opus_multistream_decoder_init(st, Fs, channels, streams, coupled_streams, mapping); + if (error) + *error = ret; + if (ret != OPUS_OK) + { + opus_free(st); + st = NULL; + } + return st; +} + +typedef void (*opus_copy_channel_out_func)( + void *dst, + int dst_stride, + int dst_channel, + const opus_val16 *src, + int src_stride, + int frame_size +); + +static int opus_multistream_packet_validate(const unsigned char *data, + opus_int32 len, int nb_streams, opus_int32 Fs) +{ + int s; + int count; + unsigned char toc; + opus_int16 size[48]; + int samples=0; + opus_int32 packet_offset; + + for (s=0;s<nb_streams;s++) + { + int tmp_samples; + if (len<=0) + return OPUS_INVALID_PACKET; + count = opus_packet_parse_impl(data, len, s!=nb_streams-1, &toc, NULL, + size, NULL, &packet_offset); + if (count<0) + return count; + tmp_samples = opus_packet_get_nb_samples(data, packet_offset, Fs); + if (s!=0 && samples != tmp_samples) + return OPUS_INVALID_PACKET; + samples = tmp_samples; + data += packet_offset; + len -= packet_offset; + } + return samples; +} + +static int opus_multistream_decode_native( + OpusMSDecoder *st, + const unsigned char *data, + opus_int32 len, + void *pcm, + opus_copy_channel_out_func copy_channel_out, + int frame_size, + int decode_fec, + int soft_clip +) +{ + opus_int32 Fs; + int coupled_size; + int mono_size; + int s, c; + char *ptr; + int do_plc=0; + VARDECL(opus_val16, buf); + ALLOC_STACK; + + /* Limit frame_size to avoid excessive stack allocations. */ + opus_multistream_decoder_ctl(st, OPUS_GET_SAMPLE_RATE(&Fs)); + frame_size = IMIN(frame_size, Fs/25*3); + ALLOC(buf, 2*frame_size, opus_val16); + ptr = (char*)st + align(sizeof(OpusMSDecoder)); + coupled_size = opus_decoder_get_size(2); + mono_size = opus_decoder_get_size(1); + + if (len==0) + do_plc = 1; + if (len < 0) + { + RESTORE_STACK; + return OPUS_BAD_ARG; + } + if (!do_plc && len < 2*st->layout.nb_streams-1) + { + RESTORE_STACK; + return OPUS_INVALID_PACKET; + } + if (!do_plc) + { + int ret = opus_multistream_packet_validate(data, len, st->layout.nb_streams, Fs); + if (ret < 0) + { + RESTORE_STACK; + return ret; + } else if (ret > frame_size) + { + RESTORE_STACK; + return OPUS_BUFFER_TOO_SMALL; + } + } + for (s=0;s<st->layout.nb_streams;s++) + { + OpusDecoder *dec; + int packet_offset, ret; + + dec = (OpusDecoder*)ptr; + ptr += (s < st->layout.nb_coupled_streams) ? align(coupled_size) : align(mono_size); + + if (!do_plc && len<=0) + { + RESTORE_STACK; + return OPUS_INTERNAL_ERROR; + } + packet_offset = 0; + ret = opus_decode_native(dec, data, len, buf, frame_size, decode_fec, s!=st->layout.nb_streams-1, &packet_offset, soft_clip); + data += packet_offset; + len -= packet_offset; + if (ret <= 0) + { + RESTORE_STACK; + return ret; + } + frame_size = ret; + if (s < st->layout.nb_coupled_streams) + { + int chan, prev; + prev = -1; + /* Copy "left" audio to the channel(s) where it belongs */ + while ( (chan = get_left_channel(&st->layout, s, prev)) != -1) + { + (*copy_channel_out)(pcm, st->layout.nb_channels, chan, + buf, 2, frame_size); + prev = chan; + } + prev = -1; + /* Copy "right" audio to the channel(s) where it belongs */ + while ( (chan = get_right_channel(&st->layout, s, prev)) != -1) + { + (*copy_channel_out)(pcm, st->layout.nb_channels, chan, + buf+1, 2, frame_size); + prev = chan; + } + } else { + int chan, prev; + prev = -1; + /* Copy audio to the channel(s) where it belongs */ + while ( (chan = get_mono_channel(&st->layout, s, prev)) != -1) + { + (*copy_channel_out)(pcm, st->layout.nb_channels, chan, + buf, 1, frame_size); + prev = chan; + } + } + } + /* Handle muted channels */ + for (c=0;c<st->layout.nb_channels;c++) + { + if (st->layout.mapping[c] == 255) + { + (*copy_channel_out)(pcm, st->layout.nb_channels, c, + NULL, 0, frame_size); + } + } + RESTORE_STACK; + return frame_size; +} + +#if !defined(DISABLE_FLOAT_API) +static void opus_copy_channel_out_float( + void *dst, + int dst_stride, + int dst_channel, + const opus_val16 *src, + int src_stride, + int frame_size +) +{ + float *float_dst; + opus_int32 i; + float_dst = (float*)dst; + if (src != NULL) + { + for (i=0;i<frame_size;i++) +#if defined(FIXED_POINT) + float_dst[i*dst_stride+dst_channel] = (1/32768.f)*src[i*src_stride]; +#else + float_dst[i*dst_stride+dst_channel] = src[i*src_stride]; +#endif + } + else + { + for (i=0;i<frame_size;i++) + float_dst[i*dst_stride+dst_channel] = 0; + } +} +#endif + +static void opus_copy_channel_out_short( + void *dst, + int dst_stride, + int dst_channel, + const opus_val16 *src, + int src_stride, + int frame_size +) +{ + opus_int16 *short_dst; + opus_int32 i; + short_dst = (opus_int16*)dst; + if (src != NULL) + { + for (i=0;i<frame_size;i++) +#if defined(FIXED_POINT) + short_dst[i*dst_stride+dst_channel] = src[i*src_stride]; +#else + short_dst[i*dst_stride+dst_channel] = FLOAT2INT16(src[i*src_stride]); +#endif + } + else + { + for (i=0;i<frame_size;i++) + short_dst[i*dst_stride+dst_channel] = 0; + } +} + + + +#ifdef FIXED_POINT +int opus_multistream_decode( + OpusMSDecoder *st, + const unsigned char *data, + opus_int32 len, + opus_int16 *pcm, + int frame_size, + int decode_fec +) +{ + return opus_multistream_decode_native(st, data, len, + pcm, opus_copy_channel_out_short, frame_size, decode_fec, 0); +} + +#ifndef DISABLE_FLOAT_API +int opus_multistream_decode_float(OpusMSDecoder *st, const unsigned char *data, + opus_int32 len, float *pcm, int frame_size, int decode_fec) +{ + return opus_multistream_decode_native(st, data, len, + pcm, opus_copy_channel_out_float, frame_size, decode_fec, 0); +} +#endif + +#else + +int opus_multistream_decode(OpusMSDecoder *st, const unsigned char *data, + opus_int32 len, opus_int16 *pcm, int frame_size, int decode_fec) +{ + return opus_multistream_decode_native(st, data, len, + pcm, opus_copy_channel_out_short, frame_size, decode_fec, 1); +} + +int opus_multistream_decode_float( + OpusMSDecoder *st, + const unsigned char *data, + opus_int32 len, + float *pcm, + int frame_size, + int decode_fec +) +{ + return opus_multistream_decode_native(st, data, len, + pcm, opus_copy_channel_out_float, frame_size, decode_fec, 0); +} +#endif + +int opus_multistream_decoder_ctl(OpusMSDecoder *st, int request, ...) +{ + va_list ap; + int coupled_size, mono_size; + char *ptr; + int ret = OPUS_OK; + + va_start(ap, request); + + coupled_size = opus_decoder_get_size(2); + mono_size = opus_decoder_get_size(1); + ptr = (char*)st + align(sizeof(OpusMSDecoder)); + switch (request) + { + case OPUS_GET_BANDWIDTH_REQUEST: + case OPUS_GET_SAMPLE_RATE_REQUEST: + case OPUS_GET_GAIN_REQUEST: + case OPUS_GET_LAST_PACKET_DURATION_REQUEST: + { + OpusDecoder *dec; + /* For int32* GET params, just query the first stream */ + opus_int32 *value = va_arg(ap, opus_int32*); + dec = (OpusDecoder*)ptr; + ret = opus_decoder_ctl(dec, request, value); + } + break; + case OPUS_GET_FINAL_RANGE_REQUEST: + { + int s; + opus_uint32 *value = va_arg(ap, opus_uint32*); + opus_uint32 tmp; + if (!value) + { + goto bad_arg; + } + *value = 0; + for (s=0;s<st->layout.nb_streams;s++) + { + OpusDecoder *dec; + dec = (OpusDecoder*)ptr; + if (s < st->layout.nb_coupled_streams) + ptr += align(coupled_size); + else + ptr += align(mono_size); + ret = opus_decoder_ctl(dec, request, &tmp); + if (ret != OPUS_OK) break; + *value ^= tmp; + } + } + break; + case OPUS_RESET_STATE: + { + int s; + for (s=0;s<st->layout.nb_streams;s++) + { + OpusDecoder *dec; + + dec = (OpusDecoder*)ptr; + if (s < st->layout.nb_coupled_streams) + ptr += align(coupled_size); + else + ptr += align(mono_size); + ret = opus_decoder_ctl(dec, OPUS_RESET_STATE); + if (ret != OPUS_OK) + break; + } + } + break; + case OPUS_MULTISTREAM_GET_DECODER_STATE_REQUEST: + { + int s; + opus_int32 stream_id; + OpusDecoder **value; + stream_id = va_arg(ap, opus_int32); + if (stream_id<0 || stream_id >= st->layout.nb_streams) + ret = OPUS_BAD_ARG; + value = va_arg(ap, OpusDecoder**); + if (!value) + { + goto bad_arg; + } + for (s=0;s<stream_id;s++) + { + if (s < st->layout.nb_coupled_streams) + ptr += align(coupled_size); + else + ptr += align(mono_size); + } + *value = (OpusDecoder*)ptr; + } + break; + case OPUS_SET_GAIN_REQUEST: + { + int s; + /* This works for int32 params */ + opus_int32 value = va_arg(ap, opus_int32); + for (s=0;s<st->layout.nb_streams;s++) + { + OpusDecoder *dec; + + dec = (OpusDecoder*)ptr; + if (s < st->layout.nb_coupled_streams) + ptr += align(coupled_size); + else + ptr += align(mono_size); + ret = opus_decoder_ctl(dec, request, value); + if (ret != OPUS_OK) + break; + } + } + break; + default: + ret = OPUS_UNIMPLEMENTED; + break; + } + + va_end(ap); + return ret; +bad_arg: + va_end(ap); + return OPUS_BAD_ARG; +} + + +void opus_multistream_decoder_destroy(OpusMSDecoder *st) +{ + opus_free(st); +} |