src/memblockq.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <sys/time.h>
  27 #include <time.h>
  28 #include <stdio.h>
  29 #include <assert.h>
  30 #include <stdlib.h>
  31
  32 #include "memblockq.h"
  33
  34 struct memblock_list {
  35     struct memblock_list *next;
  36     struct pa_memchunk chunk;
  37     struct timeval stamp;
  38 };
  39
  40 struct pa_memblockq {
  41     struct memblock_list *blocks, *blocks_tail;
  42     unsigned n_blocks;
  43     size_t current_length, maxlength, tlength, base, prebuf, minreq;
  44     int measure_delay;
  45     uint32_t delay;
  46     struct pa_mcalign *mcalign;
  47 };
  48
  49 struct pa_memblockq* pa_memblockq_new(size_t maxlength, size_t tlength, size_t base, size_t prebuf, size_t minreq) {
  50     struct pa_memblockq* bq;
  51     assert(maxlength && base && maxlength);
  52
  53     bq = malloc(sizeof(struct pa_memblockq));
  54     assert(bq);
  55     bq->blocks = bq->blocks_tail = 0;
  56     bq->n_blocks = 0;
  57
  58     bq->current_length = 0;
  59
  60     fprintf(stderr, "memblockq requested: maxlength=%u, tlength=%u, base=%u, prebuf=%u, minreq=%u\n", maxlength, tlength, base, prebuf, minreq);
  61
  62     bq->base = base;
  63
  64     bq->maxlength = ((maxlength+base-1)/base)*base;
  65     assert(bq->maxlength >= base);
  66
  67     bq->tlength = ((tlength+base-1)/base)*base;
  68     if (bq->tlength == 0 || bq->tlength >= bq->maxlength)
  69         bq->tlength = bq->maxlength;
  70
  71     bq->prebuf = (prebuf == (size_t) -1) ? bq->maxlength/2 : prebuf;
  72     bq->prebuf = (bq->prebuf/base)*base;
  73     if (bq->prebuf > bq->maxlength)
  74         bq->prebuf = bq->maxlength;
  75
  76     bq->minreq = (minreq/base)*base;
  77     if (bq->minreq == 0)
  78         bq->minreq = 1;
  79
  80     fprintf(stderr, "memblockq sanitized: maxlength=%u, tlength=%u, base=%u, prebuf=%u, minreq=%u\n", bq->maxlength, bq->tlength, bq->base, bq->prebuf, bq->minreq);
  81
  82     bq->measure_delay = 0;
  83     bq->delay = 0;
  84
  85     bq->mcalign = NULL;
  86
  87     return bq;
  88 }
  89
  90 void pa_memblockq_free(struct pa_memblockq* bq) {
  91     struct memblock_list *l;
  92     assert(bq);
  93
  94     if (bq->mcalign)
  95         pa_mcalign_free(bq->mcalign);
  96
  97     while ((l = bq->blocks)) {
  98         bq->blocks = l->next;
  99         pa_memblock_unref(l->chunk.memblock);
 100         free(l);
 101     }
 102
 103     free(bq);
 104 }
 105
 106 void pa_memblockq_push(struct pa_memblockq* bq, const struct pa_memchunk *chunk, size_t delta) {
 107     struct memblock_list *q;
 108     assert(bq && chunk && chunk->memblock && chunk->length && (chunk->length % bq->base) == 0);
 109
 110     if (bq->blocks_tail && bq->blocks_tail->chunk.memblock == chunk->memblock) {
 111         /* Try to merge memory chunks */
 112
 113         if (bq->blocks_tail->chunk.index+bq->blocks_tail->chunk.length == chunk->index) {
 114             bq->blocks_tail->chunk.length += chunk->length;
 115             bq->current_length += chunk->length;
 116
 117     /*        fprintf(stderr, __FILE__": merge succeeded: %u\n", chunk->length);*/
 118             return;
 119         }
 120     }
 121
 122     q = malloc(sizeof(struct memblock_list));
 123     assert(q);
 124
 125     if (bq->measure_delay)
 126         gettimeofday(&q->stamp, NULL);
 127     else
 128         timerclear(&q->stamp);
 129
 130     q->chunk = *chunk;
 131     pa_memblock_ref(q->chunk.memblock);
 132     assert(q->chunk.index+q->chunk.length <= q->chunk.memblock->length);
 133     q->next = NULL;
 134
 135     if (bq->blocks_tail)
 136         bq->blocks_tail->next = q;
 137     else
 138         bq->blocks = q;
 139
 140     bq->blocks_tail = q;
 141
 142     bq->n_blocks++;
 143     bq->current_length += chunk->length;
 144
 145     pa_memblockq_shorten(bq, bq->maxlength);
 146 }
 147
 148 int pa_memblockq_peek(struct pa_memblockq* bq, struct pa_memchunk *chunk) {
 149     assert(bq && chunk);
 150
 151     if (!bq->blocks || bq->current_length < bq->prebuf)
 152         return -1;
 153
 154     bq->prebuf = 0;
 155
 156     *chunk = bq->blocks->chunk;
 157     pa_memblock_ref(chunk->memblock);
 158
 159 /*     if (chunk->memblock->ref != 2) */
 160 /*         fprintf(stderr, "block %p with ref %u peeked.\n", chunk->memblock, chunk->memblock->ref); */
 161
 162     return 0;
 163 }
 164
 165 /*
 166 int memblockq_pop(struct memblockq* bq, struct pa_memchunk *chunk) {
 167     struct memblock_list *q;
 168
 169     assert(bq && chunk);
 170
 171     if (!bq->blocks || bq->current_length < bq->prebuf)
 172         return -1;
 173
 174     bq->prebuf = 0;
 175
 176     q = bq->blocks;
 177     bq->blocks = bq->blocks->next;
 178
 179     *chunk = q->chunk;
 180
 181     bq->n_blocks--;
 182     bq->current_length -= chunk->length;
 183
 184     free(q);
 185     return 0;
 186 }
 187 */
 188
 189 static uint32_t age(struct timeval *tv) {
 190     assert(tv);
 191     struct timeval now;
 192     uint32_t r;
 193
 194     if (tv->tv_sec == 0)
 195         return 0;
 196
 197     gettimeofday(&now, NULL);
 198
 199     r = (now.tv_sec-tv->tv_sec) * 1000000;
 200
 201     if (now.tv_usec >= tv->tv_usec)
 202         r += now.tv_usec - tv->tv_usec;
 203     else
 204         r -= tv->tv_usec - now.tv_usec;
 205
 206     return r;
 207 }
 208
 209 void pa_memblockq_drop(struct pa_memblockq *bq, size_t length) {
 210     assert(bq && length && (length % bq->base) == 0);
 211
 212     while (length > 0) {
 213         size_t l = length;
 214         assert(bq->blocks && bq->current_length >= length);
 215
 216         if (l > bq->blocks->chunk.length)
 217             l = bq->blocks->chunk.length;
 218
 219         if (bq->measure_delay)
 220             bq->delay = age(&bq->blocks->stamp);
 221
 222         bq->blocks->chunk.index += l;
 223         bq->blocks->chunk.length -= l;
 224         bq->current_length -= l;
 225
 226         if (bq->blocks->chunk.length == 0) {
 227             struct memblock_list *q;
 228
 229             q = bq->blocks;
 230             bq->blocks = bq->blocks->next;
 231             if (bq->blocks == NULL)
 232                 bq->blocks_tail = NULL;
 233             pa_memblock_unref(q->chunk.memblock);
 234             free(q);
 235
 236             bq->n_blocks--;
 237         }
 238
 239         length -= l;
 240     }
 241 }
 242
 243 void pa_memblockq_shorten(struct pa_memblockq *bq, size_t length) {
 244     size_t l;
 245     assert(bq);
 246
 247     if (bq->current_length <= length)
 248         return;
 249
 250     fprintf(stderr, "Warning! pa_memblockq_shorten()\n");
 251
 252     l = bq->current_length - length;
 253     l /= bq->base;
 254     l *= bq->base;
 255
 256     pa_memblockq_drop(bq, l);
 257 }
 258
 259
 260 void pa_memblockq_empty(struct pa_memblockq *bq) {
 261     assert(bq);
 262     pa_memblockq_shorten(bq, 0);
 263 }
 264
 265 int pa_memblockq_is_readable(struct pa_memblockq *bq) {
 266     assert(bq);
 267
 268     return bq->current_length && (bq->current_length >= bq->prebuf);
 269 }
 270
 271 int pa_memblockq_is_writable(struct pa_memblockq *bq, size_t length) {
 272     assert(bq);
 273
 274     return bq->current_length + length <= bq->tlength;
 275 }
 276
 277 uint32_t pa_memblockq_get_delay(struct pa_memblockq *bq) {
 278     assert(bq);
 279     return bq->delay;
 280 }
 281
 282 uint32_t pa_memblockq_get_length(struct pa_memblockq *bq) {
 283     assert(bq);
 284     return bq->current_length;
 285 }
 286
 287 uint32_t pa_memblockq_missing(struct pa_memblockq *bq) {
 288     size_t l;
 289     assert(bq);
 290
 291     if (bq->current_length >= bq->tlength)
 292         return 0;
 293
 294     l = bq->tlength - bq->current_length;
 295     assert(l);
 296
 297     return (l >= bq->minreq) ? l : 0;
 298 }
 299
 300 void pa_memblockq_push_align(struct pa_memblockq* bq, const struct pa_memchunk *chunk, size_t delta) {
 301     struct pa_memchunk rchunk;
 302     assert(bq && chunk && bq->base);
 303
 304     if (bq->base == 1) {
 305         pa_memblockq_push(bq, chunk, delta);
 306         return;
 307     }
 308
 309     if (!bq->mcalign) {
 310         bq->mcalign = pa_mcalign_new(bq->base);
 311         assert(bq->mcalign);
 312     }
 313
 314     pa_mcalign_push(bq->mcalign, chunk);
 315
 316     while (pa_mcalign_pop(bq->mcalign, &rchunk) >= 0) {
 317         pa_memblockq_push(bq, &rchunk, delta);
 318         pa_memblock_unref(rchunk.memblock);
 319         delta = 0;
 320     }
 321 }
 322
 323 uint32_t pa_memblockq_get_minreq(struct pa_memblockq *bq) {
 324     assert(bq);
 325     return bq->minreq;
 326 }