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http: Add support reading ICY metadata

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Export the metadata as a icy_metadata_packet avoption.
Based on the work of wm4 and Alessandro Ghedini.

Bug-Id: https://bugs.debian.org/739936

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Luca Barbato 2014-03-10 21:11:35 +01:00
parent 4ff99ab3d7
commit 8075c3d8bb
2 changed files with 123 additions and 1 deletions
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20
doc/protocols.texi
View File

@ -89,6 +89,26 @@ m3u8 files.
HTTP (Hyper Text Transfer Protocol).
This protocol accepts the following options:
@table @option
@item icy
If set to 1 request ICY (SHOUTcast) metadata from the server. If the server
supports this, the metadata has to be retrieved by the application by reading
the @option{icy_metadata_headers} and @option{icy_metadata_packet} options.
The default is 0.
@item icy_metadata_headers
If the server supports ICY metadata, this contains the ICY-specific HTTP reply
headers, separated by newline characters.
@item icy_metadata_packet
If the server supports ICY metadata, and @option{icy} was set to 1, this
contains the last non-empty metadata packet sent by the server. It should be
polled in regular intervals by applications interested in mid-stream metadata
updates.
@end table
@section mmst
MMS (Microsoft Media Server) protocol over TCP.

104
libavformat/http.c
View File

@ -68,6 +68,13 @@ typedef struct {
int multiple_requests;
uint8_t *post_data;
int post_datalen;
int icy;
/* how much data was read since the last ICY metadata packet */
int icy_data_read;
/* after how many bytes of read data a new metadata packet will be found */
int icy_metaint;
char *icy_metadata_headers;
char *icy_metadata_packet;
#if CONFIG_ZLIB
int compressed;
z_stream inflate_stream;
@ -85,6 +92,9 @@ static const AVOption options[] = {
{"headers", "custom HTTP headers, can override built in default headers", OFFSET(headers), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E },
{"multiple_requests", "use persistent connections", OFFSET(multiple_requests), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
{"post_data", "custom HTTP post data", OFFSET(post_data), AV_OPT_TYPE_BINARY, .flags = D|E },
{"icy", "request ICY metadata", OFFSET(icy), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D },
{"icy_metadata_headers", "return ICY metadata headers", OFFSET(icy_metadata_headers), AV_OPT_TYPE_STRING, {0}, 0, 0, AV_OPT_FLAG_EXPORT },
{"icy_metadata_packet", "return current ICY metadata packet", OFFSET(icy_metadata_packet), AV_OPT_TYPE_STRING, {0}, 0, 0, AV_OPT_FLAG_EXPORT },
{"auth_type", "HTTP authentication type", OFFSET(auth_state.auth_type), AV_OPT_TYPE_INT, {.i64 = HTTP_AUTH_NONE}, HTTP_AUTH_NONE, HTTP_AUTH_BASIC, D|E, "auth_type" },
{"none", "No auth method set, autodetect", 0, AV_OPT_TYPE_CONST, {.i64 = HTTP_AUTH_NONE}, 0, 0, D|E, "auth_type" },
{"basic", "HTTP basic authentication", 0, AV_OPT_TYPE_CONST, {.i64 = HTTP_AUTH_BASIC}, 0, 0, D|E, "auth_type" },
@ -225,6 +235,7 @@ int ff_http_do_new_request(URLContext *h, const char *uri)
int ret;
s->off = 0;
s->icy_data_read = 0;
av_free(s->location);
s->location = av_strdup(uri);
if (!s->location)
@ -380,6 +391,23 @@ static int parse_content_encoding(URLContext *h, char *p)
return 0;
}
// Concat all Icy- header lines
static int parse_icy(HTTPContext *s, const char *tag, const char *p)
{
int len = 4 + strlen(p) + strlen(tag);
int ret;
if (s->icy_metadata_headers)
len += strlen(s->icy_metadata_headers);
if ((ret = av_reallocp(&s->icy_metadata_headers, len)) < 0)
return ret;
av_strlcatf(s->icy_metadata_headers, len, "%s: %s\n", tag, p);
return 0;
}
static int process_line(URLContext *h, char *line, int line_count,
int *new_location)
{
@ -440,6 +468,11 @@ static int process_line(URLContext *h, char *line, int line_count,
} else if (!av_strcasecmp(tag, "Connection")) {
if (!strcmp(p, "close"))
s->willclose = 1;
} else if (!av_strcasecmp (tag, "Icy-MetaInt")) {
s->icy_metaint = strtoll(p, NULL, 10);
} else if (!av_strncasecmp(tag, "Icy-", 4)) {
if ((ret = parse_icy(s, tag, p)) < 0)
return ret;
} else if (!av_strcasecmp(tag, "Content-Encoding")) {
if ((ret = parse_content_encoding(h, p)) < 0)
return ret;
@ -552,6 +585,10 @@ static int http_connect(URLContext *h, const char *path, const char *local_path,
if (!has_header(s->headers, "\r\nContent-Length: ") && s->post_data)
len += av_strlcatf(headers + len, sizeof(headers) - len,
"Content-Length: %d\r\n", s->post_datalen);
if (!has_header(s->headers, "\r\nIcy-MetaData: ") && s->icy) {
len += av_strlcatf(headers + len, sizeof(headers) - len,
"Icy-MetaData: %d\r\n", 1);
}
/* now add in custom headers */
if (s->headers)
@ -585,6 +622,7 @@ static int http_connect(URLContext *h, const char *path, const char *local_path,
s->buf_end = s->buffer;
s->line_count = 0;
s->off = 0;
s->icy_data_read = 0;
s->filesize = -1;
s->willclose = 0;
s->end_chunked_post = 0;
@ -662,7 +700,7 @@ static int http_buf_read_compressed(URLContext *h, uint8_t *buf, int size)
}
#endif
static int http_read(URLContext *h, uint8_t *buf, int size)
static int http_read_stream(URLContext *h, uint8_t *buf, int size)
{
HTTPContext *s = h->priv_data;
int err, new_location;
@ -704,6 +742,70 @@ static int http_read(URLContext *h, uint8_t *buf, int size)
return http_buf_read(h, buf, size);
}
static int http_read_stream_all(URLContext *h, uint8_t *buf, int size)
{
int pos = 0;
while (pos < size) {
int len = http_read_stream(h, buf + pos, size - pos);
if (len < 0)
return len;
pos += len;
}
return pos;
}
static int store_icy(URLContext *h, int size)
{
HTTPContext *s = h->priv_data;
/* until next metadata packet */
int remaining = s->icy_metaint - s->icy_data_read;
if (remaining < 0)
return AVERROR_INVALIDDATA;
if (!remaining) {
// The metadata packet is variable sized. It has a 1 byte header
// which sets the length of the packet (divided by 16). If it's 0,
// the metadata doesn't change. After the packet, icy_metaint bytes
// of normal data follow.
uint8_t ch;
int len = http_read_stream_all(h, &ch, 1);
if (len < 0)
return len;
if (ch > 0) {
char data[255 * 16 + 1];
int ret;
len = ch * 16;
ret = http_read_stream_all(h, data, len);
if (ret < 0)
return ret;
data[len + 1] = 0;
if ((ret = av_opt_set(s, "icy_metadata_packet", data, 0)) < 0)
return ret;
}
s->icy_data_read = 0;
remaining = s->icy_metaint;
}
return FFMIN(size, remaining);
}
static int http_read(URLContext *h, uint8_t *buf, int size)
{
HTTPContext *s = h->priv_data;
if (s->icy_metaint > 0) {
size = store_icy(h, size);
if (size < 0)
return size;
}
size = http_read_stream(h, buf, size);
if (size > 0)
s->icy_data_read += size;
return size;
}
/* used only when posting data */
static int http_write(URLContext *h, const uint8_t *buf, int size)
{