opusdec_filter.c

   1 /*
   2  * Copyright (c) 2002-2007 Jean-Marc Valin
   3  * Copyright (c) 2008 CSIRO
   4  * Copyright (c) 2007-2012 Xiph.Org Foundation
   5  * Copyright (C) 2012-2013 Andre Noll <maan@systemlinux.org>
   6  *
   7  * Licensed under the GPL v2. For licencing details see COPYING.
   8  */
   9
  10 /** \file opusdec_filter.c The ogg/opus decoder. */
  11
  12 /* This file is based on opusdec.c, by Jean-Marc Valin, see below. */
  13
  14 /*
  15  * Redistribution and use in source and binary forms, with or without
  16  * modification, are permitted provided that the following conditions are met:
  17  *
  18  * - Redistributions of source code must retain the above copyright notice,
  19  * this list of conditions and the following disclaimer.
  20  *
  21  * - Redistributions in binary form must reproduce the above copyright notice,
  22  * this list of conditions and the following disclaimer in the documentation
  23  * and/or other materials provided with the distribution.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
  26  * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  27  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE
  29  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38
  39 /* Silence gcc warning caused by including opus.h */
  40 #if !defined(__STDC_VERSION__)
  41 #define __STDC_VERSION__ 0
  42 #endif
  43
  44 #include <regex.h>
  45 #include <opus/opus.h>
  46 #include <opus/opus_multistream.h>
  47 #include <ogg/ogg.h>
  48 #include <math.h>
  49
  50 #include "para.h"
  51 #include "list.h"
  52 #include "sched.h"
  53 #include "ggo.h"
  54 #include "buffer_tree.h"
  55 #include "filter.h"
  56 #include "error.h"
  57 #include "string.h"
  58 #include "opus_common.h"
  59
  60 /** 120ms at 48000 */
  61 #define MAX_FRAME_SIZE (960*6)
  62
  63 struct opusdec_context {
  64         OpusMSDecoder *st;
  65         opus_int64 packet_count;
  66         int total_links;
  67         bool stream_init;
  68         ogg_sync_state oy;
  69         ogg_stream_state os;
  70         ogg_page ogg_page;
  71         bool eos;
  72         int channels;
  73         int preskip;
  74         bool have_opus_stream;
  75         ogg_int32_t opus_serialno;
  76 };
  77
  78 static int opusdec_execute(struct btr_node *btrn, const char *cmd,
  79                 char **result)
  80 {
  81         struct filter_node *fn = btr_context(btrn);
  82         struct opusdec_context *ctx = fn->private_data;
  83
  84         return decoder_execute(cmd, 48000, ctx->channels, result);
  85 }
  86
  87 static void opusdec_open(struct filter_node *fn)
  88 {
  89         struct opusdec_context *ctx = para_calloc(sizeof(*ctx));
  90
  91         ogg_sync_init(&ctx->oy);
  92         fn->private_data = ctx;
  93 }
  94
  95 static void opusdec_close(struct filter_node *fn)
  96 {
  97         struct opusdec_context *ctx = fn->private_data;
  98
  99         if (ctx->st) {
 100                 opus_multistream_decoder_destroy(ctx->st);
 101                 if (ctx->stream_init)
 102                         ogg_stream_clear(&ctx->os);
 103                 ogg_sync_clear(&ctx->oy);
 104         }
 105         free(ctx);
 106         fn->private_data = NULL;
 107 }
 108
 109 /* Process an Opus header and setup the opus decoder based on it. */
 110 static int opusdec_init(ogg_packet *op, struct opusdec_context *ctx)
 111 {
 112         int ret;
 113         struct opus_header header;
 114
 115         ctx->st = NULL;
 116         ret = opus_parse_header((char *)op->packet, op->bytes, &header);
 117         if (ret < 0)
 118                 return ret;
 119         PARA_INFO_LOG("detected header v%d\n", header.version);
 120         ctx->channels = header.channels;
 121         ctx->preskip = header.preskip;
 122         ctx->st = opus_multistream_decoder_create(48000, header.channels,
 123                 header.nb_streams, header.nb_coupled, header.stream_map, &ret);
 124         if (ret != OPUS_OK || !ctx->st) {
 125                 PARA_ERROR_LOG("%s\n", opus_strerror(ret));
 126                 return -E_CREATE_OPUS_DECODER;
 127         }
 128         if (header.gain != 0) {
 129                 ret = opus_multistream_decoder_ctl(ctx->st,
 130                         OPUS_SET_GAIN(header.gain));
 131                 if (ret != OPUS_OK) {
 132                         PARA_ERROR_LOG("%s\n", opus_strerror(ret));
 133                         return -E_OPUS_SET_GAIN;
 134                 }
 135                 PARA_INFO_LOG("playback gain: %fdB\n", header.gain / 256.);
 136         }
 137         PARA_INFO_LOG("%d channel(s), 48KHz\n", ctx->channels);
 138         return 1;
 139 }
 140
 141 static void opusdec_add_output(short *pcm, int frames_available,
 142                 struct btr_node *btrn, struct opusdec_context *ctx)
 143 {
 144         int tmp_skip, num_frames, bytes;
 145
 146         tmp_skip = PARA_MIN(ctx->preskip, frames_available);
 147         ctx->preskip -= tmp_skip;
 148         num_frames = frames_available - tmp_skip;
 149         if (num_frames <= 0)
 150                 return;
 151         bytes = sizeof(short) * num_frames * ctx->channels;
 152
 153         if (tmp_skip > 0) {
 154                 short *in = pcm + ctx->channels * tmp_skip;
 155                 short *out = para_malloc(bytes);
 156                 memcpy(out, in, bytes);
 157                 free(pcm);
 158                 pcm = out;
 159         }
 160         btr_add_output((char *)pcm, bytes, btrn);
 161 }
 162
 163 /* returns > 1 if packet was decoded, 0 if it was ignored, negative on errors. */
 164 static int decode_packet(struct opusdec_context *ctx, ogg_packet *op,
 165                 struct btr_node *btrn)
 166 {
 167         int ret;
 168         short *output;
 169
 170         /*
 171          * OggOpus streams are identified by a magic string in the initial
 172          * stream header.
 173          */
 174         if (op->b_o_s && op->bytes >= 8 && !memcmp(op->packet, "OpusHead", 8)) {
 175                 if (!ctx->have_opus_stream) {
 176                         ctx->opus_serialno = ctx->os.serialno;
 177                         ctx->have_opus_stream = true;
 178                         ctx->packet_count = 0;
 179                         ctx->eos = false;
 180                         ctx->total_links++;
 181                 } else
 182                         PARA_NOTICE_LOG("ignoring opus stream %llu\n",
 183                                 (long long unsigned)ctx->os.serialno);
 184         }
 185         if (!ctx->have_opus_stream || ctx->os.serialno != ctx->opus_serialno)
 186                 return 0;
 187         /* If first packet in a logical stream, process the Opus header. */
 188         if (ctx->packet_count == 0)
 189                 return opusdec_init(op, ctx);
 190         if (ctx->packet_count == 1)
 191                 return 1;
 192         /* don't care for anything except opus eos */
 193         if (op->e_o_s && ctx->os.serialno == ctx->opus_serialno)
 194                 ctx->eos = true;
 195         output = para_malloc(sizeof(short) * MAX_FRAME_SIZE * ctx->channels);
 196         ret = opus_multistream_decode(ctx->st, (unsigned char *)op->packet,
 197                 op->bytes, output, MAX_FRAME_SIZE, 0);
 198         if (ret < 0) {
 199                 PARA_ERROR_LOG("%s\n", opus_strerror(ret));
 200                 free(output);
 201                 return -E_OPUS_DECODE;
 202         }
 203         opusdec_add_output(output, ret, btrn, ctx);
 204         return 1;
 205 }
 206
 207 static void opusdec_pre_select(struct sched *s, struct task *t)
 208 {
 209         struct filter_node *fn = container_of(t, struct filter_node, task);
 210         struct btr_node *btrn = fn->btrn;
 211         int ns;
 212
 213         ns = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
 214         if (ns != 0)
 215                 return sched_min_delay(s);
 216         sched_request_timeout_ms(100, s);
 217 }
 218
 219 static int opusdec_post_select(__a_unused struct sched *s, struct task *t)
 220 {
 221         struct filter_node *fn = container_of(t, struct filter_node, task);
 222         struct opusdec_context *ctx = fn->private_data;
 223         struct btr_node *btrn = fn->btrn;
 224         int ret;
 225         char *btr_buf, *data;
 226         size_t nbytes;
 227         ogg_packet op;
 228
 229         ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
 230         if (ret <= 0)
 231                 goto out;
 232         btr_merge(btrn, fn->min_iqs);
 233         nbytes = btr_next_buffer(btrn, &btr_buf);
 234         nbytes = PARA_MIN(nbytes, (size_t)32768);
 235         ret = 0;
 236         if (nbytes == 0)
 237                 goto out;
 238         data = ogg_sync_buffer(&ctx->oy, nbytes);
 239         memcpy(data, btr_buf, nbytes);
 240         btr_consume(btrn, nbytes);
 241         ogg_sync_wrote(&ctx->oy, nbytes);
 242         for (;;) { /* loop over all ogg pages we got */
 243                 ret = 0;
 244                 if (ogg_sync_pageout(&ctx->oy, &ctx->ogg_page) != 1)
 245                         goto out;
 246                 if (!ctx->stream_init) {
 247                         ogg_stream_init(&ctx->os, ogg_page_serialno(&ctx->ogg_page));
 248                         ctx->stream_init = true;
 249                 }
 250                 if (ogg_page_serialno(&ctx->ogg_page) != ctx->os.serialno)
 251                         ogg_stream_reset_serialno(&ctx->os,
 252                                 ogg_page_serialno(&ctx->ogg_page));
 253                 /* Add page to the bitstream */
 254                 ogg_stream_pagein(&ctx->os, &ctx->ogg_page);
 255                 for (;;) { /* loop over all opus packets */
 256                         ret = ogg_stream_packetout(&ctx->os, &op);
 257                         if (ret != 1)
 258                                 break;
 259                         ret = decode_packet(ctx, &op, btrn);
 260                         if (ret < 0)
 261                                 goto out;
 262                         ctx->packet_count++;
 263                         if (ctx->eos)
 264                                 ctx->have_opus_stream = false;
 265                 }
 266         }
 267 out:
 268         if (ret < 0)
 269                 btr_remove_node(&fn->btrn);
 270         return ret;
 271 }
 272
 273 /**
 274  * The init function of the opusdec filter.
 275  *
 276  * \param f Pointer to the filter struct to initialize.
 277  *
 278  * \sa filter::init.
 279  */
 280 void opusdec_filter_init(struct filter *f)
 281 {
 282         f->open = opusdec_open;
 283         f->close = opusdec_close;
 284         f->pre_select = generic_filter_pre_select;
 285         f->pre_select = opusdec_pre_select;
 286         f->post_select = opusdec_post_select;
 287         f->execute = opusdec_execute;
 288 }