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add support for HTTP seeking
patch by Ronald S. Bultje % rbultje A ronald P bitfreak P net % Original thread: Date: Jan 4, 2007 5:42 AM Subject: [Ffmpeg-devel] [PATCH/RFC] http seeking Originally committed as revision 7505 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ronald S. Bultje
Guillaume Poirier
parent
597e3232ef
commit
fb2b4fc50a
@ -40,40 +40,34 @@
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/* used for protocol handling */
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#define BUFFER_SIZE 1024
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#define URL_SIZE 4096
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#define MAX_REDIRECTS 8
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typedef struct {
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URLContext *hd;
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unsigned char buffer[BUFFER_SIZE], *buf_ptr, *buf_end;
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int line_count;
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int http_code;
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offset_t off, filesize;
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char location[URL_SIZE];
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} HTTPContext;
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static int http_connect(URLContext *h, const char *path, const char *hoststr,
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const char *auth);
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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(URLContext *h, const char *uri, int flags)
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static int http_open_cnx(URLContext *h)
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{
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const char *path, *proxy_path;
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char hostname[1024], hoststr[1024];
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char auth[1024];
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char path1[1024];
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char buf[1024];
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int port, use_proxy, err;
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HTTPContext *s;
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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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h->is_streamed = 1;
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s = av_malloc(sizeof(HTTPContext));
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if (!s) {
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return -ENOMEM;
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}
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h->priv_data = s;
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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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strstart(proxy_path, "http://", NULL);
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@ -82,7 +76,7 @@ static int http_open(URLContext *h, const char *uri, int flags)
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redo:
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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), uri);
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path1, sizeof(path1), s->location);
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if (port > 0) {
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snprintf(hoststr, sizeof(hoststr), "%s:%d", hostname, port);
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} else {
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@ -92,7 +86,7 @@ static int http_open(URLContext *h, const char *uri, int flags)
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if (use_proxy) {
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url_split(NULL, 0, auth, sizeof(auth), hostname, sizeof(hostname), &port,
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NULL, 0, proxy_path);
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path = uri;
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path = s->location;
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} else {
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if (path1[0] == '\0')
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path = "/";
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@ -108,22 +102,44 @@ static int http_open(URLContext *h, const char *uri, int flags)
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goto fail;
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s->hd = hd;
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if (http_connect(h, path, hoststr, auth) < 0)
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if (http_connect(h, path, hoststr, auth, &location_changed) < 0)
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goto fail;
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if (s->http_code == 303 && s->location[0] != '\0') {
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if (s->http_code == 303 && location_changed == 1) {
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/* url moved, get next */
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uri = s->location;
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url_close(hd);
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if (redirects++ >= MAX_REDIRECTS)
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return AVERROR_IO;
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location_changed = 0;
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goto redo;
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}
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return 0;
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fail:
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if (hd)
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url_close(hd);
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av_free(s);
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return AVERROR_IO;
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}
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static int http_open(URLContext *h, const char *uri, int flags)
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{
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HTTPContext *s;
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int ret;
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h->is_streamed = 1;
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s = av_malloc(sizeof(HTTPContext));
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if (!s) {
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return -ENOMEM;
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}
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h->priv_data = s;
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s->filesize = -1;
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s->off = 0;
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pstrcpy (s->location, URL_SIZE, uri);
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ret = http_open_cnx(h);
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if (ret != 0)
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av_free (s);
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return ret;
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}
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static int http_getc(HTTPContext *s)
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{
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int len;
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@ -141,8 +157,10 @@ static int http_getc(HTTPContext *s)
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return *s->buf_ptr++;
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}
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static int process_line(HTTPContext *s, char *line, int line_count)
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static int process_line(URLContext *h, char *line, int line_count,
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int *new_location)
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{
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HTTPContext *s = h->priv_data;
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char *tag, *p;
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/* end of header */
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@ -172,18 +190,32 @@ static int process_line(HTTPContext *s, char *line, int line_count)
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p++;
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if (!strcmp(tag, "Location")) {
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strcpy(s->location, p);
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*new_location = 1;
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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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const char *slash;
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if (!strncmp (p, "bytes ", 6)) {
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p += 6;
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s->off = atoll(p);
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if ((slash = strchr(p, '/')) && strlen(slash) > 0)
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s->filesize = atoll(slash+1);
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}
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h->is_streamed = 0; /* we _can_ in fact seek */
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}
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}
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return 1;
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}
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static int http_connect(URLContext *h, const char *path, const char *hoststr,
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const char *auth)
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const char *auth, int *new_location)
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{
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HTTPContext *s = h->priv_data;
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int post, err, ch;
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char line[1024], *q;
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char *auth_b64;
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offset_t off = s->off;
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/* send http header */
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@ -191,15 +223,17 @@ static int http_connect(URLContext *h, const char *path, const char *hoststr,
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auth_b64 = av_base64_encode((uint8_t *)auth, strlen(auth));
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snprintf(s->buffer, sizeof(s->buffer),
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"%s %s HTTP/1.0\r\n"
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"%s %s HTTP/1.1\r\n"
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"User-Agent: %s\r\n"
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"Accept: */*\r\n"
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"Range: bytes=%llu-\r\n"
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"Host: %s\r\n"
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"Authorization: Basic %s\r\n"
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"\r\n",
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post ? "POST" : "GET",
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path,
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LIBAVFORMAT_IDENT,
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s->off,
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hoststr,
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auth_b64);
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@ -211,7 +245,7 @@ static int http_connect(URLContext *h, const char *path, const char *hoststr,
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s->buf_ptr = s->buffer;
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s->buf_end = s->buffer;
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s->line_count = 0;
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s->location[0] = '\0';
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s->off = 0;
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if (post) {
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sleep(1);
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return 0;
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@ -231,11 +265,11 @@ static int http_connect(URLContext *h, const char *path, const char *hoststr,
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#ifdef DEBUG
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printf("header='%s'\n", line);
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#endif
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err = process_line(s, line, s->line_count);
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err = process_line(h, line, s->line_count, new_location);
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if (err < 0)
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return err;
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if (err == 0)
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return 0;
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break;
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s->line_count++;
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q = line;
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} else {
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@ -243,6 +277,8 @@ static int http_connect(URLContext *h, const char *path, const char *hoststr,
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*q++ = ch;
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}
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}
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return (off == s->off) ? 0 : -1;
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}
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@ -261,6 +297,8 @@ static int http_read(URLContext *h, uint8_t *buf, int size)
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} else {
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len = url_read(s->hd, buf, size);
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}
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if (len > 0)
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s->off += len;
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return len;
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}
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@ -279,11 +317,40 @@ static int http_close(URLContext *h)
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return 0;
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}
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static offset_t http_seek(URLContext *h, offset_t off, int whence)
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{
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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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return s->filesize;
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else if ((s->filesize == -1 && whence == SEEK_END) || h->is_streamed)
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return -1;
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/* we save the old context in case the seek fails */
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s->hd = NULL;
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if (whence == SEEK_CUR)
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off += s->off;
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else if (whence == SEEK_END)
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off += s->filesize;
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s->off = off;
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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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s->hd = old_hd;
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s->off = old_off;
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return -1;
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}
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url_close(old_hd);
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return off;
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}
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URLProtocol http_protocol = {
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"http",
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http_open,
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http_read,
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http_write,
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NULL, /* seek */
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http_seek,
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http_close,
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};
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