[FFmpeg-devel] [patch]add mmsh protocol and extract common code for mmst.c
Stefano Sabatini
stefano.sabatini-lala
Thu Aug 19 18:16:49 CEST 2010
On date Thursday 2010-08-19 23:55:40 +0800, zhentan feng encoded:
[...]
> Index: libavformat/mmsh.c
> ===================================================================
> --- libavformat/mmsh.c (revision 0)
> +++ libavformat/mmsh.c (revision 0)
[...]
> +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 %d\n",
> + len, sizeof(mms->in_buffer));
weird indent "foo" is usually vertically aligned to the first char
after (, like in
av_log(NULL, AV_LOG_ERROR,
"Data packet length %d exceeds the in_buffer size %d\n",
len, sizeof(mms->in_buffer));
> + return AVERROR(EIO);
> + }
> + res = url_read_complete(mms->mms_hd, mms->in_buffer, len);
> + dprintf(NULL, "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);
ditto
> + 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;
> + chunk_type = get_chunk_header(mmsh, &len);
> + if (chunk_type < 0) {
> + return chunk_type;
> + } 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;
> + dprintf(NULL, "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);
weird indent
> + return AVERROR(EIO);
> + }
> + res = url_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);
ditto
> + 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 %d\n",
> + len, sizeof(mms->in_buffer));
ditto
> + return AVERROR(EIO);
> + }
> + res = url_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 {
> + dprintf(NULL, "Skip chunk type %d \n", chunk_type);
> + continue;
> + }
> + }
> + }
> + }
> + return 0;
> +}
> +
> +static int mmsh_open(URLContext *h, const char *uri, int flags)
> +{
> + int i, port, err;
> + char httpname[256], path[256], host[128], location[1024];
> + char *stream_selection;
> + char headers[1024];
> + MMSHContext *mmsh;
> + MMSContext *mms;
> +
> + mmsh = h->priv_data = av_mallocz(sizeof(MMSHContext));
> + if (!h->priv_data)
> + return AVERROR(ENOMEM);
> + mmsh->request_seq = h->is_streamed = 1;
> + mms = &mmsh->mms;
> + av_strlcpy(location, uri, sizeof(location));
> +
> + av_url_split(NULL, 0, NULL, 0,
> + host, sizeof(host), &port, path, sizeof(path), location);
> + if (port<0)
> + port = 80; // default mmsh protocol port
> + ff_url_join(httpname, sizeof(httpname), "http", NULL, host, port, path);
> +
> + if (url_alloc(&mms->mms_hd, httpname, URL_RDONLY) < 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\r\n",
> + host, port, mmsh->request_seq++);
ditto
> + ff_http_set_headers(mms->mms_hd, headers);
> +
> + err = url_connect(mms->mms_hd);
> + 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.
> + url_close(mms->mms_hd);
> + memset(headers, 0, sizeof(headers));
> + if (url_alloc(&mms->mms_hd, httpname, URL_RDONLY) < 0) {
> + return AVERROR(EIO);
> + }
> + 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"
> + "Connection: Close\r\n\r\n",
> + host, port, mmsh->request_seq++, mms->stream_num, stream_selection);
ditto
[...]
> +URLProtocol mmsh_protocol = {
> + .name = "mmsh",
> + .url_open = mmsh_open,
> + .url_read = mmsh_read,
> + .url_write = NULL, // write
> + .url_seek = NULL, // seek
redundant comments
> + .url_close = mmsh_close,
> +};
> Index: doc/protocols.texi
> ===================================================================
> --- doc/protocols.texi (revision 24834)
> +++ doc/protocols.texi (working copy)
> @@ -73,6 +73,15 @@
>
> MMS (Microsoft Media Server) protocol over TCP.
>
> + at section mmsh
> +
> +MMS (Microsoft Media Server) protocol over HTTP.
> +
> +The required syntax is:
> + at example
> +mmsh://@var{server}[:@var{port}][/@var{app}][/@var{playpath}]
> + at end example
> +
> @section md5
I assume this is the right syntax.
No other objections from me.
Regards.
--
FFmpeg = Fast Faithful Mournful Perennial Excellent Gymnast
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