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![Diego Biurrun](/assets/img/avatar_default.png)
Adding _POSIX_C_SOURCE to CPPFLAGS globally produces all sorts of problems since it causes certain system functions to be hidden on some (BSD) systems. The solution is to only add the flag on systems that really require it, i.e. glibc-based ones. This change makes BSD systems compile out-of-the-box without the need for adding specific flags manually. It also allows dropping a number of flags set manually on a file-per-file basis, but were only present to work around breakage introduced by the presence of _POSIX_C_SOURCE. Also add _XOPEN_SOURCE to CPPFLAGS for glibc systems. We use XSI extensions in several places already, so it is preferable to define it globally instead of littering source files with individual #defines only needed for glibc.
306 lines
8.9 KiB
C
306 lines
8.9 KiB
C
/*
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* Apple HTTP Live Streaming Protocol Handler
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* Copyright (c) 2010 Martin Storsjo
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Apple HTTP Live Streaming Protocol Handler
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* http://tools.ietf.org/html/draft-pantos-http-live-streaming
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*/
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#include "libavutil/avstring.h"
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#include "avformat.h"
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#include "internal.h"
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#include "url.h"
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#include <unistd.h>
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/*
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* An apple http stream consists of a playlist with media segment files,
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* played sequentially. There may be several playlists with the same
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* video content, in different bandwidth variants, that are played in
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* parallel (preferrably only one bandwidth variant at a time). In this case,
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* the user supplied the url to a main playlist that only lists the variant
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* playlists.
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*
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* If the main playlist doesn't point at any variants, we still create
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* one anonymous toplevel variant for this, to maintain the structure.
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*/
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struct segment {
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int duration;
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char url[MAX_URL_SIZE];
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};
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struct variant {
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int bandwidth;
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char url[MAX_URL_SIZE];
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};
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typedef struct AppleHTTPContext {
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char playlisturl[MAX_URL_SIZE];
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int target_duration;
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int start_seq_no;
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int finished;
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int n_segments;
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struct segment **segments;
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int n_variants;
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struct variant **variants;
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int cur_seq_no;
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URLContext *seg_hd;
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int64_t last_load_time;
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} AppleHTTPContext;
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static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
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{
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int len = ff_get_line(s, buf, maxlen);
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while (len > 0 && isspace(buf[len - 1]))
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buf[--len] = '\0';
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return len;
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}
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static void free_segment_list(AppleHTTPContext *s)
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{
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int i;
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for (i = 0; i < s->n_segments; i++)
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av_free(s->segments[i]);
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av_freep(&s->segments);
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s->n_segments = 0;
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}
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static void free_variant_list(AppleHTTPContext *s)
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{
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int i;
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for (i = 0; i < s->n_variants; i++)
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av_free(s->variants[i]);
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av_freep(&s->variants);
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s->n_variants = 0;
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}
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struct variant_info {
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char bandwidth[20];
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};
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static void handle_variant_args(struct variant_info *info, const char *key,
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int key_len, char **dest, int *dest_len)
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{
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if (!strncmp(key, "BANDWIDTH=", key_len)) {
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*dest = info->bandwidth;
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*dest_len = sizeof(info->bandwidth);
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}
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}
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static int parse_playlist(URLContext *h, const char *url)
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{
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AppleHTTPContext *s = h->priv_data;
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AVIOContext *in;
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int ret = 0, duration = 0, is_segment = 0, is_variant = 0, bandwidth = 0;
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char line[1024];
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const char *ptr;
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if ((ret = avio_open(&in, url, AVIO_FLAG_READ)) < 0)
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return ret;
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read_chomp_line(in, line, sizeof(line));
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if (strcmp(line, "#EXTM3U"))
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return AVERROR_INVALIDDATA;
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free_segment_list(s);
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s->finished = 0;
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while (!in->eof_reached) {
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read_chomp_line(in, line, sizeof(line));
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if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
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struct variant_info info = {{0}};
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is_variant = 1;
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ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
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&info);
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bandwidth = atoi(info.bandwidth);
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} else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
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s->target_duration = atoi(ptr);
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} else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
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s->start_seq_no = atoi(ptr);
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} else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
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s->finished = 1;
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} else if (av_strstart(line, "#EXTINF:", &ptr)) {
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is_segment = 1;
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duration = atoi(ptr);
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} else if (av_strstart(line, "#", NULL)) {
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continue;
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} else if (line[0]) {
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if (is_segment) {
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struct segment *seg = av_malloc(sizeof(struct segment));
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if (!seg) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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seg->duration = duration;
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ff_make_absolute_url(seg->url, sizeof(seg->url), url, line);
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dynarray_add(&s->segments, &s->n_segments, seg);
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is_segment = 0;
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} else if (is_variant) {
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struct variant *var = av_malloc(sizeof(struct variant));
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if (!var) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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var->bandwidth = bandwidth;
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ff_make_absolute_url(var->url, sizeof(var->url), url, line);
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dynarray_add(&s->variants, &s->n_variants, var);
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is_variant = 0;
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}
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}
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}
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s->last_load_time = av_gettime();
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fail:
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avio_close(in);
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return ret;
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}
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static int applehttp_open(URLContext *h, const char *uri, int flags)
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{
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AppleHTTPContext *s;
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int ret, i;
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const char *nested_url;
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if (flags & AVIO_FLAG_WRITE)
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return AVERROR(ENOSYS);
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s = av_mallocz(sizeof(AppleHTTPContext));
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if (!s)
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return AVERROR(ENOMEM);
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h->priv_data = s;
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h->is_streamed = 1;
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if (av_strstart(uri, "applehttp+", &nested_url)) {
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av_strlcpy(s->playlisturl, nested_url, sizeof(s->playlisturl));
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} else if (av_strstart(uri, "applehttp://", &nested_url)) {
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av_strlcpy(s->playlisturl, "http://", sizeof(s->playlisturl));
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av_strlcat(s->playlisturl, nested_url, sizeof(s->playlisturl));
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} else {
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av_log(h, AV_LOG_ERROR, "Unsupported url %s\n", uri);
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ret = AVERROR(EINVAL);
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goto fail;
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}
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if ((ret = parse_playlist(h, s->playlisturl)) < 0)
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goto fail;
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if (s->n_segments == 0 && s->n_variants > 0) {
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int max_bandwidth = 0, maxvar = -1;
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for (i = 0; i < s->n_variants; i++) {
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if (s->variants[i]->bandwidth > max_bandwidth || i == 0) {
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max_bandwidth = s->variants[i]->bandwidth;
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maxvar = i;
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}
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}
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av_strlcpy(s->playlisturl, s->variants[maxvar]->url,
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sizeof(s->playlisturl));
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if ((ret = parse_playlist(h, s->playlisturl)) < 0)
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goto fail;
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}
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if (s->n_segments == 0) {
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av_log(h, AV_LOG_WARNING, "Empty playlist\n");
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ret = AVERROR(EIO);
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goto fail;
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}
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s->cur_seq_no = s->start_seq_no;
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if (!s->finished && s->n_segments >= 3)
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s->cur_seq_no = s->start_seq_no + s->n_segments - 3;
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return 0;
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fail:
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av_free(s);
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return ret;
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}
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static int applehttp_read(URLContext *h, uint8_t *buf, int size)
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{
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AppleHTTPContext *s = h->priv_data;
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const char *url;
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int ret;
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start:
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if (s->seg_hd) {
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ret = ffurl_read(s->seg_hd, buf, size);
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if (ret > 0)
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return ret;
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}
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if (s->seg_hd) {
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ffurl_close(s->seg_hd);
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s->seg_hd = NULL;
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s->cur_seq_no++;
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}
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retry:
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if (!s->finished) {
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int64_t now = av_gettime();
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if (now - s->last_load_time >= s->target_duration*1000000)
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if ((ret = parse_playlist(h, s->playlisturl)) < 0)
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return ret;
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}
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if (s->cur_seq_no < s->start_seq_no) {
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av_log(h, AV_LOG_WARNING,
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"skipping %d segments ahead, expired from playlist\n",
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s->start_seq_no - s->cur_seq_no);
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s->cur_seq_no = s->start_seq_no;
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}
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if (s->cur_seq_no - s->start_seq_no >= s->n_segments) {
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if (s->finished)
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return AVERROR_EOF;
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while (av_gettime() - s->last_load_time < s->target_duration*1000000) {
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if (url_interrupt_cb())
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return AVERROR_EXIT;
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usleep(100*1000);
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}
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goto retry;
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}
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url = s->segments[s->cur_seq_no - s->start_seq_no]->url,
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av_log(h, AV_LOG_DEBUG, "opening %s\n", url);
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ret = ffurl_open(&s->seg_hd, url, AVIO_FLAG_READ);
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if (ret < 0) {
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if (url_interrupt_cb())
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return AVERROR_EXIT;
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av_log(h, AV_LOG_WARNING, "Unable to open %s\n", url);
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s->cur_seq_no++;
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goto retry;
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}
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goto start;
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}
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static int applehttp_close(URLContext *h)
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{
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AppleHTTPContext *s = h->priv_data;
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free_segment_list(s);
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free_variant_list(s);
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ffurl_close(s->seg_hd);
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av_free(s);
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return 0;
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}
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URLProtocol ff_applehttp_protocol = {
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.name = "applehttp",
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.url_open = applehttp_open,
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.url_read = applehttp_read,
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.url_close = applehttp_close,
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.flags = URL_PROTOCOL_FLAG_NESTED_SCHEME,
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};
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