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FFmpeg/libavformat/mmsh.c
Andreas Rheinhardt 493356cc0b avformat/asf: Move ASF GUIDs to a new file 
They are also needed by the MMSH and MMST protocols and therefore
the file they are in is pulled in when these protocols are enabled
and used. By moving them to a separate file, linking statically to
libavformat while only using AVIO no longer pulls in all the
muxers/demuxers (and also no longer any AVCodecs when linking
statically to libavcodec).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-05-10 07:46:57 +02:00

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/*
* MMS protocol over HTTP
* Copyright (c) 2010 Zhentan Feng <spyfeng at gmail dot com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* Reference
* Windows Media HTTP Streaming Protocol.
* http://msdn.microsoft.com/en-us/library/cc251059(PROT.10).aspx
*/
#include <string.h>
#include "libavutil/intreadwrite.h"
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "internal.h"
#include "mms.h"
#include "http.h"
#include "url.h"
#define CHUNK_HEADER_LENGTH 4 // 2bytes chunk type and 2bytes chunk length.
#define EXT_HEADER_LENGTH 8 // 4bytes sequence, 2bytes useless and 2bytes chunk length.
// see Ref 2.2.1.8
#define USERAGENT "User-Agent: NSPlayer/4.1.0.3856\r\n"
// see Ref 2.2.1.4.33
// the GUID value can be changed to any valid value.
#define CLIENTGUID "Pragma: xClientGUID={c77e7400-738a-11d2-9add-0020af0a3278}\r\n"
// see Ref 2.2.3 for packet type define:
// chunk type contains 2 fields: Frame and PacketID.
// Frame is 0x24 or 0xA4(rarely), different PacketID indicates different packet type.
typedef enum {
CHUNK_TYPE_DATA = 0x4424,
CHUNK_TYPE_ASF_HEADER = 0x4824,
CHUNK_TYPE_END = 0x4524,
CHUNK_TYPE_STREAM_CHANGE = 0x4324,
} ChunkType;
typedef struct MMSHContext {
MMSContext mms;
uint8_t location[1024];
int request_seq; ///< request packet sequence
int chunk_seq; ///< data packet sequence
} MMSHContext;
static int mmsh_close(URLContext *h)
{
MMSHContext *mmsh = (MMSHContext *)h->priv_data;
MMSContext *mms = &mmsh->mms;
ffurl_closep(&mms->mms_hd);
av_freep(&mms->streams);
av_freep(&mms->asf_header);
return 0;
}
static ChunkType get_chunk_header(MMSHContext *mmsh, int *len)
{
MMSContext *mms = &mmsh->mms;
uint8_t chunk_header[CHUNK_HEADER_LENGTH];
uint8_t ext_header[EXT_HEADER_LENGTH];
ChunkType chunk_type;
int chunk_len, res, ext_header_len;
res = ffurl_read_complete(mms->mms_hd, chunk_header, CHUNK_HEADER_LENGTH);
if (res != CHUNK_HEADER_LENGTH) {
av_log(NULL, AV_LOG_ERROR, "Read data packet header failed!\n");
return AVERROR(EIO);
}
chunk_type = AV_RL16(chunk_header);
chunk_len = AV_RL16(chunk_header + 2);
switch (chunk_type) {
case CHUNK_TYPE_END:
case CHUNK_TYPE_STREAM_CHANGE:
ext_header_len = 4;
break;
case CHUNK_TYPE_ASF_HEADER:
case CHUNK_TYPE_DATA:
ext_header_len = 8;
break;
default:
av_log(NULL, AV_LOG_ERROR, "Strange chunk type %d\n", chunk_type);
return AVERROR_INVALIDDATA;
}
res = ffurl_read_complete(mms->mms_hd, ext_header, ext_header_len);
if (res != ext_header_len) {
av_log(NULL, AV_LOG_ERROR, "Read ext header failed!\n");
return AVERROR(EIO);
}
*len = chunk_len - ext_header_len;
if (chunk_type == CHUNK_TYPE_END || chunk_type == CHUNK_TYPE_DATA)
mmsh->chunk_seq = AV_RL32(ext_header);
return chunk_type;
}
static int read_data_packet(MMSHContext *mmsh, const int len)
{
MMSContext *mms = &mmsh->mms;
int res;
if (len > sizeof(mms->in_buffer)) {
av_log(NULL, AV_LOG_ERROR,
"Data packet length %d exceeds the in_buffer size %"SIZE_SPECIFIER"\n",
len, sizeof(mms->in_buffer));
return AVERROR(EIO);
}
res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
av_log(NULL, AV_LOG_TRACE, "Data packet len = %d\n", len);
if (res != len) {
av_log(NULL, AV_LOG_ERROR, "Read data packet failed!\n");
return AVERROR(EIO);
}
if (len > mms->asf_packet_len) {
av_log(NULL, AV_LOG_ERROR,
"Chunk length %d exceed packet length %d\n",len, mms->asf_packet_len);
return AVERROR_INVALIDDATA;
} else {
memset(mms->in_buffer + len, 0, mms->asf_packet_len - len); // padding
}
mms->read_in_ptr = mms->in_buffer;
mms->remaining_in_len = mms->asf_packet_len;
return 0;
}
static int get_http_header_data(MMSHContext *mmsh)
{
MMSContext *mms = &mmsh->mms;
int res, len;
ChunkType chunk_type;
for (;;) {
len = 0;
res = chunk_type = get_chunk_header(mmsh, &len);
if (res < 0) {
return res;
} else if (chunk_type == CHUNK_TYPE_ASF_HEADER){
// get asf header and stored it
if (!mms->header_parsed) {
if (mms->asf_header) {
if (len != mms->asf_header_size) {
mms->asf_header_size = len;
av_log(NULL, AV_LOG_TRACE, "Header len changed from %d to %d\n",
mms->asf_header_size, len);
av_freep(&mms->asf_header);
}
}
mms->asf_header = av_mallocz(len);
if (!mms->asf_header) {
return AVERROR(ENOMEM);
}
mms->asf_header_size = len;
}
if (len > mms->asf_header_size) {
av_log(NULL, AV_LOG_ERROR,
"Asf header packet len = %d exceed the asf header buf size %d\n",
len, mms->asf_header_size);
return AVERROR(EIO);
}
res = ffurl_read_complete(mms->mms_hd, mms->asf_header, len);
if (res != len) {
av_log(NULL, AV_LOG_ERROR,
"Recv asf header data len %d != expected len %d\n", res, len);
return AVERROR(EIO);
}
mms->asf_header_size = len;
if (!mms->header_parsed) {
res = ff_mms_asf_header_parser(mms);
mms->header_parsed = 1;
return res;
}
} else if (chunk_type == CHUNK_TYPE_DATA) {
// read data packet and do padding
return read_data_packet(mmsh, len);
} else {
if (len) {
if (len > sizeof(mms->in_buffer)) {
av_log(NULL, AV_LOG_ERROR,
"Other packet len = %d exceed the in_buffer size %"SIZE_SPECIFIER"\n",
len, sizeof(mms->in_buffer));
return AVERROR(EIO);
}
res = ffurl_read_complete(mms->mms_hd, mms->in_buffer, len);
if (res != len) {
av_log(NULL, AV_LOG_ERROR, "Read other chunk type data failed!\n");
return AVERROR(EIO);
} else {
av_log(NULL, AV_LOG_TRACE, "Skip chunk type %d \n", chunk_type);
continue;
}
}
}
}
}
static int mmsh_open_internal(URLContext *h, const char *uri, int flags, int timestamp, int64_t pos)
{
int i, port, err;
char httpname[256], path[256], host[128];
char *stream_selection = NULL;
char headers[1024];
MMSHContext *mmsh = h->priv_data;
MMSContext *mms;
mmsh->request_seq = h->is_streamed = 1;
mms = &mmsh->mms;
av_strlcpy(mmsh->location, uri, sizeof(mmsh->location));
av_url_split(NULL, 0, NULL, 0,
host, sizeof(host), &port, path, sizeof(path), mmsh->location);
if (port<0)
port = 80; // default mmsh protocol port
ff_url_join(httpname, sizeof(httpname), "http", NULL, host, port, "%s", path);
if (ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
&h->interrupt_callback) < 0) {
return AVERROR(EIO);
}
snprintf(headers, sizeof(headers),
"Accept: */*\r\n"
USERAGENT
"Host: %s:%d\r\n"
"Pragma: no-cache,rate=1.000000,stream-time=0,"
"stream-offset=0:0,request-context=%u,max-duration=0\r\n"
CLIENTGUID
"Connection: Close\r\n",
host, port, mmsh->request_seq++);
av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
if (!mms->mms_hd->protocol_whitelist && h->protocol_whitelist) {
mms->mms_hd->protocol_whitelist = av_strdup(h->protocol_whitelist);
if (!mms->mms_hd->protocol_whitelist) {
err = AVERROR(ENOMEM);
goto fail;
}
}
err = ffurl_connect(mms->mms_hd, NULL);
if (err) {
goto fail;
}
err = get_http_header_data(mmsh);
if (err) {
av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
goto fail;
}
// close the socket and then reopen it for sending the second play request.
ffurl_closep(&mms->mms_hd);
memset(headers, 0, sizeof(headers));
if ((err = ffurl_alloc(&mms->mms_hd, httpname, AVIO_FLAG_READ,
&h->interrupt_callback)) < 0) {
goto fail;
}
stream_selection = av_mallocz(mms->stream_num * 19 + 1);
if (!stream_selection)
return AVERROR(ENOMEM);
for (i = 0; i < mms->stream_num; i++) {
char tmp[20];
err = snprintf(tmp, sizeof(tmp), "ffff:%d:0 ", mms->streams[i].id);
if (err < 0)
goto fail;
av_strlcat(stream_selection, tmp, mms->stream_num * 19 + 1);
}
// send play request
err = snprintf(headers, sizeof(headers),
"Accept: */*\r\n"
USERAGENT
"Host: %s:%d\r\n"
"Pragma: no-cache,rate=1.000000,request-context=%u\r\n"
"Pragma: xPlayStrm=1\r\n"
CLIENTGUID
"Pragma: stream-switch-count=%d\r\n"
"Pragma: stream-switch-entry=%s\r\n"
"Pragma: no-cache,rate=1.000000,stream-time=%u"
"Connection: Close\r\n",
host, port, mmsh->request_seq++, mms->stream_num, stream_selection, timestamp);
av_freep(&stream_selection);
if (err < 0) {
av_log(NULL, AV_LOG_ERROR, "Build play request failed!\n");
goto fail;
}
av_log(NULL, AV_LOG_TRACE, "out_buffer is %s", headers);
av_opt_set(mms->mms_hd->priv_data, "headers", headers, 0);
err = ffurl_connect(mms->mms_hd, NULL);
if (err) {
goto fail;
}
err = get_http_header_data(mmsh);
if (err) {
av_log(NULL, AV_LOG_ERROR, "Get http header data failed!\n");
goto fail;
}
av_log(NULL, AV_LOG_TRACE, "Connection successfully open\n");
return 0;
fail:
av_freep(&stream_selection);
mmsh_close(h);
av_log(NULL, AV_LOG_TRACE, "Connection failed with error %d\n", err);
return err;
}
static int mmsh_open(URLContext *h, const char *uri, int flags)
{
return mmsh_open_internal(h, uri, flags, 0, 0);
}
static int handle_chunk_type(MMSHContext *mmsh)
{
MMSContext *mms = &mmsh->mms;
int res, len = 0;
ChunkType chunk_type;
chunk_type = get_chunk_header(mmsh, &len);
switch (chunk_type) {
case CHUNK_TYPE_END:
mmsh->chunk_seq = 0;
av_log(NULL, AV_LOG_ERROR, "Stream ended!\n");
return AVERROR(EIO);
case CHUNK_TYPE_STREAM_CHANGE:
mms->header_parsed = 0;
if (res = get_http_header_data(mmsh)) {
av_log(NULL, AV_LOG_ERROR,"Stream changed! Failed to get new header!\n");
return res;
}
break;
case CHUNK_TYPE_DATA:
return read_data_packet(mmsh, len);
default:
av_log(NULL, AV_LOG_ERROR, "Recv other type packet %d\n", chunk_type);
return AVERROR_INVALIDDATA;
}
return 0;
}
static int mmsh_read(URLContext *h, uint8_t *buf, int size)
{
int res = 0;
MMSHContext *mmsh = h->priv_data;
MMSContext *mms = &mmsh->mms;
do {
if (mms->asf_header_read_size < mms->asf_header_size) {
// copy asf header into buffer
res = ff_mms_read_header(mms, buf, size);
} else {
if (!mms->remaining_in_len && (res = handle_chunk_type(mmsh)))
return res;
res = ff_mms_read_data(mms, buf, size);
}
} while (!res);
return res;
}
static int64_t mmsh_read_seek(URLContext *h, int stream_index,
int64_t timestamp, int flags)
{
MMSHContext *mmsh_old = h->priv_data;
MMSHContext *mmsh = av_mallocz(sizeof(*mmsh));
int ret;
if (!mmsh)
return AVERROR(ENOMEM);
h->priv_data = mmsh;
ret= mmsh_open_internal(h, mmsh_old->location, 0, FFMAX(timestamp, 0), 0);
if(ret>=0){
h->priv_data = mmsh_old;
mmsh_close(h);
h->priv_data = mmsh;
av_free(mmsh_old);
mmsh->mms.asf_header_read_size = mmsh->mms.asf_header_size;
}else {
h->priv_data = mmsh_old;
av_free(mmsh);
}
return ret;
}
static int64_t mmsh_seek(URLContext *h, int64_t pos, int whence)
{
MMSHContext *mmsh = h->priv_data;
MMSContext *mms = &mmsh->mms;
if(pos == 0 && whence == SEEK_CUR)
return mms->asf_header_read_size + mms->remaining_in_len + mmsh->chunk_seq * (int64_t)mms->asf_packet_len;
return AVERROR(ENOSYS);
}
const URLProtocol ff_mmsh_protocol = {
.name = "mmsh",
.url_open = mmsh_open,
.url_read = mmsh_read,
.url_seek = mmsh_seek,
.url_close = mmsh_close,
.url_read_seek = mmsh_read_seek,
.priv_data_size = sizeof(MMSHContext),
.flags = URL_PROTOCOL_FLAG_NETWORK,
.default_whitelist = "http,tcp",
};
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