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* HTTP protocol for ffmpeg client
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* Copyright (c) 2000, 2001 Fabrice Bellard.
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* This file is part of FFmpeg.
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* FFmpeg 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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* FFmpeg 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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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; 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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/* XXX: POST protocol is not completely implemented because ffmpeg uses
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only a subset of it. */
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/* used for protocol handling */
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#define BUFFER_SIZE 1024
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#define MAX_REDIRECTS 8
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unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
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offset_t off, filesize;
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char location[URL_SIZE];
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static int http_connect(URLContext *h, const char *path, const char *hoststr,
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const char *auth, int *new_location);
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static int http_write(URLContext *h, uint8_t *buf, int size);
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/* return non zero if error */
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static int http_open_cnx(URLContext *h)
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const char *path, *proxy_path;
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char hostname[1024], hoststr[1024];
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int port, use_proxy, err, location_changed = 0, redirects = 0;
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HTTPContext *s = h->priv_data;
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URLContext *hd = NULL;
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proxy_path = getenv("http_proxy");
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use_proxy = (proxy_path != NULL) && !getenv("no_proxy") &&
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av_strstart(proxy_path, "http://", NULL);
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/* fill the dest addr */
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/* needed in any case to build the host string */
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url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
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path1, sizeof(path1), s->location);
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snprintf(hoststr, sizeof(hoststr), "%s:%d", hostname, port);
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av_strlcpy(hoststr, hostname, sizeof(hoststr));
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url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
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snprintf(buf, sizeof(buf), "tcp://%s:%d", hostname, port);
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err = url_open(&hd, buf, URL_RDWR);
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if (http_connect(h, path, hoststr, auth, &location_changed) < 0)
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if ((s->http_code == 302 || s->http_code == 303) && location_changed == 1) {
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/* url moved, get next */
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if (redirects++ >= MAX_REDIRECTS)
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location_changed = 0;
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static int http_open(URLContext *h, const char *uri, int flags)
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s = av_malloc(sizeof(HTTPContext));
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return AVERROR(ENOMEM);
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av_strlcpy(s->location, uri, URL_SIZE);
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ret = http_open_cnx(h);
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static int http_getc(HTTPContext *s)
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if (s->buf_ptr >= s->buf_end) {
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len = url_read(s->hd, s->buffer, BUFFER_SIZE);
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} else if (len == 0) {
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s->buf_ptr = s->buffer;
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s->buf_end = s->buffer + len;
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return *s->buf_ptr++;
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static int process_line(URLContext *h, char *line, int line_count,
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HTTPContext *s = h->priv_data;
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if (line_count == 0) {
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while (!isspace(*p) && *p != '\0')
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s->http_code = strtol(p, NULL, 10);
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printf("http_code=%d\n", s->http_code);
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/* error codes are 4xx and 5xx */
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if (s->http_code >= 400 && s->http_code < 600)
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while (*p != '\0' && *p != ':')
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if (!strcmp(tag, "Location")) {
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strcpy(s->location, p);
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} else if (!strcmp (tag, "Content-Length") && s->filesize == -1) {
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s->filesize = atoll(p);
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} else if (!strcmp (tag, "Content-Range")) {
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/* "bytes $from-$to/$document_size" */
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if (!strncmp (p, "bytes ", 6)) {
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if ((slash = strchr(p, '/')) && strlen(slash) > 0)
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s->filesize = atoll(slash+1);
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h->is_streamed = 0; /* we _can_ in fact seek */
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static int http_connect(URLContext *h, const char *path, const char *hoststr,
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const char *auth, int *new_location)
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HTTPContext *s = h->priv_data;
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int auth_b64_len = strlen(auth)* 4 / 3 + 12;
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offset_t off = s->off;
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/* send http header */
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post = h->flags & URL_WRONLY;
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auth_b64 = av_malloc(auth_b64_len);
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av_base64_encode(auth_b64, auth_b64_len, (uint8_t *)auth, strlen(auth));
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snprintf(s->buffer, sizeof(s->buffer),
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"Range: bytes=%"PRId64"-\r\n"
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"Authorization: Basic %s\r\n"
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"Connection: close\r\n"
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post ? "POST" : "GET",
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if (http_write(h, s->buffer, strlen(s->buffer)) < 0)
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/* init input buffer */
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s->buf_ptr = s->buffer;
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s->buf_end = s->buffer;
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/* wait for header */
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if (q > line && q[-1] == '\r')
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printf("header='%s'\n", line);
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err = process_line(h, line, s->line_count, new_location);
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if ((q - line) < sizeof(line) - 1)
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return (off == s->off) ? 0 : -1;
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static int http_read(URLContext *h, uint8_t *buf, int size)
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HTTPContext *s = h->priv_data;
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/* read bytes from input buffer first */
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len = s->buf_end - s->buf_ptr;
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memcpy(buf, s->buf_ptr, len);
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len = url_read(s->hd, buf, size);
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/* used only when posting data */
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static int http_write(URLContext *h, uint8_t *buf, int size)
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HTTPContext *s = h->priv_data;
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return url_write(s->hd, buf, size);
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static int http_close(URLContext *h)
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HTTPContext *s = h->priv_data;
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static offset_t http_seek(URLContext *h, offset_t off, int whence)
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HTTPContext *s = h->priv_data;
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URLContext *old_hd = s->hd;
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offset_t old_off = s->off;
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if (whence == AVSEEK_SIZE)
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else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
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/* we save the old context in case the seek fails */
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if (whence == SEEK_CUR)
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else if (whence == SEEK_END)
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/* if it fails, continue on old connection */
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if (http_open_cnx(h) < 0) {
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URLProtocol http_protocol = {