afh_recv.c

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