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00028 #include "libavutil/avstring.h"
00029 #include "avformat.h"
00030 #include "internal.h"
00031 #include "url.h"
00032 #include <unistd.h>
00033
00034
00035
00036
00037
00038
00039
00040
00041
00042
00043
00044
00045
00046 struct segment {
00047 int duration;
00048 char url[MAX_URL_SIZE];
00049 };
00050
00051 struct variant {
00052 int bandwidth;
00053 char url[MAX_URL_SIZE];
00054 };
00055
00056 typedef struct AppleHTTPContext {
00057 char playlisturl[MAX_URL_SIZE];
00058 int target_duration;
00059 int start_seq_no;
00060 int finished;
00061 int n_segments;
00062 struct segment **segments;
00063 int n_variants;
00064 struct variant **variants;
00065 int cur_seq_no;
00066 URLContext *seg_hd;
00067 int64_t last_load_time;
00068 } AppleHTTPContext;
00069
00070 static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
00071 {
00072 int len = ff_get_line(s, buf, maxlen);
00073 while (len > 0 && isspace(buf[len - 1]))
00074 buf[--len] = '\0';
00075 return len;
00076 }
00077
00078 static void free_segment_list(AppleHTTPContext *s)
00079 {
00080 int i;
00081 for (i = 0; i < s->n_segments; i++)
00082 av_free(s->segments[i]);
00083 av_freep(&s->segments);
00084 s->n_segments = 0;
00085 }
00086
00087 static void free_variant_list(AppleHTTPContext *s)
00088 {
00089 int i;
00090 for (i = 0; i < s->n_variants; i++)
00091 av_free(s->variants[i]);
00092 av_freep(&s->variants);
00093 s->n_variants = 0;
00094 }
00095
00096 struct variant_info {
00097 char bandwidth[20];
00098 };
00099
00100 static void handle_variant_args(struct variant_info *info, const char *key,
00101 int key_len, char **dest, int *dest_len)
00102 {
00103 if (!strncmp(key, "BANDWIDTH=", key_len)) {
00104 *dest = info->bandwidth;
00105 *dest_len = sizeof(info->bandwidth);
00106 }
00107 }
00108
00109 static int parse_playlist(URLContext *h, const char *url)
00110 {
00111 AppleHTTPContext *s = h->priv_data;
00112 AVIOContext *in;
00113 int ret = 0, duration = 0, is_segment = 0, is_variant = 0, bandwidth = 0;
00114 char line[1024];
00115 const char *ptr;
00116
00117 if ((ret = avio_open2(&in, url, AVIO_FLAG_READ,
00118 &h->interrupt_callback, NULL)) < 0)
00119 return ret;
00120
00121 read_chomp_line(in, line, sizeof(line));
00122 if (strcmp(line, "#EXTM3U"))
00123 return AVERROR_INVALIDDATA;
00124
00125 free_segment_list(s);
00126 s->finished = 0;
00127 while (!url_feof(in)) {
00128 read_chomp_line(in, line, sizeof(line));
00129 if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
00130 struct variant_info info = {{0}};
00131 is_variant = 1;
00132 ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
00133 &info);
00134 bandwidth = atoi(info.bandwidth);
00135 } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
00136 s->target_duration = atoi(ptr);
00137 } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
00138 s->start_seq_no = atoi(ptr);
00139 } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
00140 s->finished = 1;
00141 } else if (av_strstart(line, "#EXTINF:", &ptr)) {
00142 is_segment = 1;
00143 duration = atoi(ptr);
00144 } else if (av_strstart(line, "#", NULL)) {
00145 continue;
00146 } else if (line[0]) {
00147 if (is_segment) {
00148 struct segment *seg = av_malloc(sizeof(struct segment));
00149 if (!seg) {
00150 ret = AVERROR(ENOMEM);
00151 goto fail;
00152 }
00153 seg->duration = duration;
00154 ff_make_absolute_url(seg->url, sizeof(seg->url), url, line);
00155 dynarray_add(&s->segments, &s->n_segments, seg);
00156 is_segment = 0;
00157 } else if (is_variant) {
00158 struct variant *var = av_malloc(sizeof(struct variant));
00159 if (!var) {
00160 ret = AVERROR(ENOMEM);
00161 goto fail;
00162 }
00163 var->bandwidth = bandwidth;
00164 ff_make_absolute_url(var->url, sizeof(var->url), url, line);
00165 dynarray_add(&s->variants, &s->n_variants, var);
00166 is_variant = 0;
00167 }
00168 }
00169 }
00170 s->last_load_time = av_gettime();
00171
00172 fail:
00173 avio_close(in);
00174 return ret;
00175 }
00176
00177 static int applehttp_close(URLContext *h)
00178 {
00179 AppleHTTPContext *s = h->priv_data;
00180
00181 free_segment_list(s);
00182 free_variant_list(s);
00183 ffurl_close(s->seg_hd);
00184 return 0;
00185 }
00186
00187 static int applehttp_open(URLContext *h, const char *uri, int flags)
00188 {
00189 AppleHTTPContext *s = h->priv_data;
00190 int ret, i;
00191 const char *nested_url;
00192
00193 if (flags & AVIO_FLAG_WRITE)
00194 return AVERROR(ENOSYS);
00195
00196 h->is_streamed = 1;
00197
00198 if (av_strstart(uri, "applehttp+", &nested_url)) {
00199 av_strlcpy(s->playlisturl, nested_url, sizeof(s->playlisturl));
00200 } else if (av_strstart(uri, "applehttp://", &nested_url)) {
00201 av_strlcpy(s->playlisturl, "http://", sizeof(s->playlisturl));
00202 av_strlcat(s->playlisturl, nested_url, sizeof(s->playlisturl));
00203 } else {
00204 av_log(h, AV_LOG_ERROR, "Unsupported url %s\n", uri);
00205 ret = AVERROR(EINVAL);
00206 goto fail;
00207 }
00208
00209 if ((ret = parse_playlist(h, s->playlisturl)) < 0)
00210 goto fail;
00211
00212 if (s->n_segments == 0 && s->n_variants > 0) {
00213 int max_bandwidth = 0, maxvar = -1;
00214 for (i = 0; i < s->n_variants; i++) {
00215 if (s->variants[i]->bandwidth > max_bandwidth || i == 0) {
00216 max_bandwidth = s->variants[i]->bandwidth;
00217 maxvar = i;
00218 }
00219 }
00220 av_strlcpy(s->playlisturl, s->variants[maxvar]->url,
00221 sizeof(s->playlisturl));
00222 if ((ret = parse_playlist(h, s->playlisturl)) < 0)
00223 goto fail;
00224 }
00225
00226 if (s->n_segments == 0) {
00227 av_log(h, AV_LOG_WARNING, "Empty playlist\n");
00228 ret = AVERROR(EIO);
00229 goto fail;
00230 }
00231 s->cur_seq_no = s->start_seq_no;
00232 if (!s->finished && s->n_segments >= 3)
00233 s->cur_seq_no = s->start_seq_no + s->n_segments - 3;
00234
00235 return 0;
00236
00237 fail:
00238 applehttp_close(h);
00239 return ret;
00240 }
00241
00242 static int applehttp_read(URLContext *h, uint8_t *buf, int size)
00243 {
00244 AppleHTTPContext *s = h->priv_data;
00245 const char *url;
00246 int ret;
00247
00248 start:
00249 if (s->seg_hd) {
00250 ret = ffurl_read(s->seg_hd, buf, size);
00251 if (ret > 0)
00252 return ret;
00253 }
00254 if (s->seg_hd) {
00255 ffurl_close(s->seg_hd);
00256 s->seg_hd = NULL;
00257 s->cur_seq_no++;
00258 }
00259 retry:
00260 if (!s->finished) {
00261 int64_t now = av_gettime();
00262 if (now - s->last_load_time >= s->target_duration*1000000)
00263 if ((ret = parse_playlist(h, s->playlisturl)) < 0)
00264 return ret;
00265 }
00266 if (s->cur_seq_no < s->start_seq_no) {
00267 av_log(h, AV_LOG_WARNING,
00268 "skipping %d segments ahead, expired from playlist\n",
00269 s->start_seq_no - s->cur_seq_no);
00270 s->cur_seq_no = s->start_seq_no;
00271 }
00272 if (s->cur_seq_no - s->start_seq_no >= s->n_segments) {
00273 if (s->finished)
00274 return AVERROR_EOF;
00275 while (av_gettime() - s->last_load_time < s->target_duration*1000000) {
00276 if (ff_check_interrupt(&h->interrupt_callback))
00277 return AVERROR_EXIT;
00278 usleep(100*1000);
00279 }
00280 goto retry;
00281 }
00282 url = s->segments[s->cur_seq_no - s->start_seq_no]->url,
00283 av_log(h, AV_LOG_DEBUG, "opening %s\n", url);
00284 ret = ffurl_open(&s->seg_hd, url, AVIO_FLAG_READ,
00285 &h->interrupt_callback, NULL);
00286 if (ret < 0) {
00287 if (ff_check_interrupt(&h->interrupt_callback))
00288 return AVERROR_EXIT;
00289 av_log(h, AV_LOG_WARNING, "Unable to open %s\n", url);
00290 s->cur_seq_no++;
00291 goto retry;
00292 }
00293 goto start;
00294 }
00295
00296 URLProtocol ff_applehttp_protocol = {
00297 .name = "applehttp",
00298 .url_open = applehttp_open,
00299 .url_read = applehttp_read,
00300 .url_close = applehttp_close,
00301 .flags = URL_PROTOCOL_FLAG_NESTED_SCHEME,
00302 .priv_data_size = sizeof(AppleHTTPContext),
00303 };