afh_recv.c

   1 /*
   2  * Copyright (C) 2011-2014 Andre Noll <maan@tuebingen.mpg.de>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file afh_recv.c Receiver for streaming local files. */
   8
   9 #include <regex.h>
  10 #include <sys/types.h>
  11 #include <stdbool.h>
  12
  13 #include "para.h"
  14 #include "error.h"
  15 #include "list.h"
  16 #include "sched.h"
  17 #include "ggo.h"
  18 #include "buffer_tree.h"
  19 #include "recv.h"
  20 #include "afh_recv.cmdline.h"
  21 #include "string.h"
  22 #include "fd.h"
  23 #include "afh.h"
  24
  25 struct private_afh_recv_data {
  26         int fd;
  27         void *map;
  28         size_t map_size;
  29         struct afh_info afhi;
  30         int audio_format_num;
  31         long unsigned first_chunk;
  32         long unsigned last_chunk;
  33         struct timeval stream_start;
  34         uint32_t current_chunk;
  35 };
  36
  37 static int afh_execute(struct btr_node *btrn, const char *cmd, char **result)
  38 {
  39         struct receiver_node *rn = btr_context(btrn);
  40         struct private_afh_recv_data *pard = rn->private_data;
  41
  42         *result = NULL;
  43         if (!strcmp(cmd, "seconds_total")) {
  44                 *result = make_message("%lu", pard->afhi.seconds_total);
  45                 return 1;
  46         }
  47         if (!strcmp(cmd, "chunks_total")) {
  48                 *result = make_message("%lu", pard->afhi.chunks_total);
  49                 return 1;
  50         }
  51         if (!strcmp(cmd, "afhi")) {
  52                 afh_get_afhi_txt(pard->audio_format_num, &pard->afhi, result);
  53                 return 1;
  54         }
  55         if (!strncmp(cmd, "repos", 5)) {
  56                 int32_t x;
  57                 int ret = para_atoi32(cmd + 5, &x);
  58                 if (ret < 0)
  59                         return ret;
  60                 if (x >= pard->afhi.chunks_total)
  61                         return -ERRNO_TO_PARA_ERROR(EINVAL);
  62                 pard->first_chunk = afh_get_start_chunk(x, &pard->afhi);
  63                 pard->current_chunk = pard->first_chunk;
  64                 return 1;
  65         }
  66         return -E_BTR_NAVAIL;
  67 }
  68
  69 static void *afh_recv_parse_config(int argc, char **argv)
  70 {
  71         struct afh_recv_args_info *tmp = para_calloc(sizeof(*tmp));
  72
  73         afh_recv_cmdline_parser(argc, argv, tmp);
  74         return tmp;
  75 }
  76
  77 static void afh_recv_free_config(void *conf)
  78 {
  79         if (!conf)
  80                 return;
  81         afh_recv_cmdline_parser_free(conf);
  82         free(conf);
  83 }
  84
  85 static int afh_recv_open(struct receiver_node *rn)
  86 {
  87         struct afh_recv_args_info *conf = rn->conf;
  88         struct private_afh_recv_data *pard;
  89         struct afh_info *afhi;
  90         char *filename = conf->filename_arg;
  91
  92         int ret;
  93
  94         if (!filename || *filename == '\0')
  95                 return -E_AFH_RECV_BAD_FILENAME;
  96         rn->private_data = pard = para_calloc(sizeof(*pard));
  97         afhi = &pard->afhi;
  98         ret = mmap_full_file(filename, O_RDONLY, &pard->map,
  99                 &pard->map_size, &pard->fd);
 100         if (ret < 0)
 101                 goto out;
 102         ret = compute_afhi(filename, pard->map, pard->map_size,
 103                 pard->fd, afhi);
 104         if (ret < 0)
 105                 goto out_unmap;
 106         pard->audio_format_num = ret;
 107         ret = -ERRNO_TO_PARA_ERROR(EINVAL);
 108         if (afhi->chunks_total == 0)
 109                 goto out_clear_afhi;
 110         if (PARA_ABS(conf->begin_chunk_arg) >= afhi->chunks_total)
 111                 goto out_clear_afhi;
 112         if (conf->begin_chunk_arg >= 0)
 113                 pard->first_chunk = afh_get_start_chunk(
 114                         conf->begin_chunk_arg, &pard->afhi);
 115         else
 116                 pard->first_chunk = afh_get_start_chunk(
 117                         afhi->chunks_total + conf->begin_chunk_arg,
 118                         &pard->afhi);
 119         if (conf->end_chunk_given) {
 120                 ret = -ERRNO_TO_PARA_ERROR(EINVAL);
 121                 if (PARA_ABS(conf->end_chunk_arg) > afhi->chunks_total)
 122                         goto out_clear_afhi;
 123                 if (conf->end_chunk_arg >= 0)
 124                         pard->last_chunk = conf->end_chunk_arg;
 125                 else
 126                         pard->last_chunk = afhi->chunks_total + conf->end_chunk_arg;
 127         } else
 128                 pard->last_chunk = afhi->chunks_total - 1;
 129         ret = -ERRNO_TO_PARA_ERROR(EINVAL);
 130         if (pard->first_chunk >= pard->last_chunk)
 131                 goto out_clear_afhi;
 132         pard->current_chunk = pard->first_chunk;
 133         return pard->audio_format_num;
 134 out_clear_afhi:
 135         clear_afhi(afhi);
 136 out_unmap:
 137         para_munmap(pard->map, pard->map_size);
 138         close(pard->fd);
 139 out:
 140         freep(&rn->private_data);
 141         return ret;
 142 }
 143
 144 static void afh_recv_close(struct receiver_node *rn)
 145 {
 146         struct private_afh_recv_data *pard;
 147
 148         if (!rn || !rn->private_data)
 149                 return;
 150         pard = rn->private_data;
 151         clear_afhi(&pard->afhi);
 152         para_munmap(pard->map, pard->map_size);
 153         close(pard->fd);
 154         freep(&rn->private_data);
 155 }
 156
 157 static void afh_recv_pre_select(struct sched *s, void *context)
 158 {
 159         struct receiver_node *rn = context;
 160         struct private_afh_recv_data *pard = rn->private_data;
 161         struct afh_info *afhi = &pard->afhi;
 162         struct afh_recv_args_info *conf = rn->conf;
 163         struct timeval chunk_time;
 164         int state = generic_recv_pre_select(s, rn);
 165
 166         if (state <= 0)
 167                 return;
 168         if (!conf->just_in_time_given) {
 169                 sched_min_delay(s);
 170                 return;
 171         }
 172         compute_chunk_time(pard->current_chunk - pard->first_chunk,
 173                 &afhi->chunk_tv, &pard->stream_start, &chunk_time);
 174         sched_request_barrier_or_min_delay(&chunk_time, s);
 175 }
 176
 177 static int afh_recv_post_select(__a_unused struct sched *s, void *context)
 178 {
 179         struct receiver_node *rn = context;
 180         struct afh_recv_args_info *conf = rn->conf;
 181         struct private_afh_recv_data *pard = rn->private_data;
 182         struct btr_node *btrn = rn->btrn;
 183         struct afh_info *afhi = &pard->afhi;
 184         int ret;
 185         char *buf;
 186         const char *start, *end;
 187         size_t size;
 188         struct timeval chunk_time;
 189
 190         ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
 191         if (ret <= 0)
 192                 goto out;
 193         if (pard->first_chunk > 0 && !conf->no_header_given) {
 194                 char *header;
 195                 afh_get_header(afhi, pard->audio_format_num, pard->map,
 196                         pard->map_size, &header, &size);
 197                 if (size > 0) {
 198                         PARA_INFO_LOG("writing header (%zu bytes)\n", size);
 199                         buf = para_malloc(size);
 200                         memcpy(buf, header, size);
 201                         btr_add_output(buf, size, btrn);
 202                         afh_free_header(header, pard->audio_format_num);
 203                 }
 204         }
 205         if (!conf->just_in_time_given) {
 206                 afh_get_chunk(pard->first_chunk, afhi, pard->map, &start, &size);
 207                 afh_get_chunk(pard->last_chunk, afhi, pard->map, &end, &size);
 208                 end += size;
 209                 PARA_INFO_LOG("adding %zu bytes\n", end - start);
 210                 btr_add_output_dont_free(start, end - start, btrn);
 211                 ret = -E_RECV_EOF;
 212                 goto out;
 213         }
 214         if (pard->current_chunk == pard->first_chunk)
 215                 pard->stream_start = *now;
 216         else {
 217                 compute_chunk_time(pard->current_chunk - pard->first_chunk,
 218                         &afhi->chunk_tv, &pard->stream_start, &chunk_time);
 219                 ret = tv_diff(&chunk_time, now, NULL);
 220                 if (ret > 0)
 221                         goto out;
 222         }
 223         afh_get_chunk(pard->current_chunk, afhi, pard->map, &start, &size);
 224         PARA_DEBUG_LOG("adding chunk %u\n", pard->current_chunk);
 225         btr_add_output_dont_free(start, size, btrn);
 226         if (pard->current_chunk >= pard->last_chunk) {
 227                 ret = -E_RECV_EOF;
 228                 goto out;
 229         }
 230         pard->current_chunk++;
 231         ret = 1;
 232 out:
 233         if (ret < 0) {
 234                 btr_remove_node(&rn->btrn);
 235                 pard->current_chunk = pard->first_chunk;
 236         }
 237         return ret;
 238 }
 239
 240 /**
 241  * The init function of the afh receiver.
 242  *
 243  * \param r Pointer to the receiver struct to initialize.
 244  *
 245  * This initializes all function pointers of \a r.
 246  */
 247 void afh_recv_init(struct receiver *r)
 248 {
 249         struct afh_recv_args_info dummy;
 250
 251         afh_init();
 252         afh_recv_cmdline_parser_init(&dummy);
 253         r->open = afh_recv_open;
 254         r->close = afh_recv_close;
 255         r->pre_select = afh_recv_pre_select;
 256         r->post_select = afh_recv_post_select;
 257         r->parse_config = afh_recv_parse_config;
 258         r->free_config = afh_recv_free_config;
 259         r->execute = afh_execute;
 260         r->help = (struct ggo_help)DEFINE_GGO_HELP(afh_recv);
 261         afh_recv_cmdline_parser_free(&dummy);
 262 }