[deb_ffmpeg.git] / ffmpeg / libavformat / sapdec.c

/*
 * Session Announcement Protocol (RFC 2974) demuxer
 * Copyright (c) 2010 Martin Storsjo
 *
 * 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
 */

#include "avformat.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/intreadwrite.h"
#include "network.h"
#include "os_support.h"
#include "internal.h"
#include "avio_internal.h"
#include "url.h"
#include "rtpdec.h"
#if HAVE_POLL_H
#include <poll.h>
#endif

struct SAPState {
    URLContext *ann_fd;
    AVFormatContext *sdp_ctx;
    AVIOContext sdp_pb;
    uint16_t hash;
    char *sdp;
    int eof;
};

static int sap_probe(AVProbeData *p)
{
    if (av_strstart(p->filename, "sap:", NULL))
        return AVPROBE_SCORE_MAX;
    return 0;
}

static int sap_read_close(AVFormatContext *s)
{
    struct SAPState *sap = s->priv_data;
    if (sap->sdp_ctx)
        avformat_close_input(&sap->sdp_ctx);
    if (sap->ann_fd)
        ffurl_close(sap->ann_fd);
    av_freep(&sap->sdp);
    ff_network_close();
    return 0;
}

static int sap_read_header(AVFormatContext *s)
{
    struct SAPState *sap = s->priv_data;
    char host[1024], path[1024], url[1024];
    uint8_t recvbuf[RTP_MAX_PACKET_LENGTH];
    int port;
    int ret, i;
    AVInputFormat* infmt;

    if (!ff_network_init())
        return AVERROR(EIO);

    av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port,
                 path, sizeof(path), s->filename);
    if (port < 0)
        port = 9875;

    if (!host[0]) {
        /* Listen for announcements on sap.mcast.net if no host was specified */
        av_strlcpy(host, "224.2.127.254", sizeof(host));
    }

    ff_url_join(url, sizeof(url), "udp", NULL, host, port, "?localport=%d",
                port);
    ret = ffurl_open(&sap->ann_fd, url, AVIO_FLAG_READ,
                     &s->interrupt_callback, NULL);
    if (ret)
        goto fail;

    while (1) {
        int addr_type, auth_len;
        int pos;

        ret = ffurl_read(sap->ann_fd, recvbuf, sizeof(recvbuf) - 1);
        if (ret == AVERROR(EAGAIN))
            continue;
        if (ret < 0)
            goto fail;
        recvbuf[ret] = '\0'; /* Null terminate for easier parsing */
        if (ret < 8) {
            av_log(s, AV_LOG_WARNING, "Received too short packet\n");
            continue;
        }

        if ((recvbuf[0] & 0xe0) != 0x20) {
            av_log(s, AV_LOG_WARNING, "Unsupported SAP version packet "
                                      "received\n");
            continue;
        }

        if (recvbuf[0] & 0x04) {
            av_log(s, AV_LOG_WARNING, "Received stream deletion "
                                      "announcement\n");
            continue;
        }
        addr_type = recvbuf[0] & 0x10;
        auth_len  = recvbuf[1];
        sap->hash = AV_RB16(&recvbuf[2]);
        pos = 4;
        if (addr_type)
            pos += 16; /* IPv6 */
        else
            pos += 4; /* IPv4 */
        pos += auth_len * 4;
        if (pos + 4 >= ret) {
            av_log(s, AV_LOG_WARNING, "Received too short packet\n");
            continue;
        }
#define MIME "application/sdp"
        if (strcmp(&recvbuf[pos], MIME) == 0) {
            pos += strlen(MIME) + 1;
        } else if (strncmp(&recvbuf[pos], "v=0\r\n", 5) == 0) {
            // Direct SDP without a mime type
        } else {
            av_log(s, AV_LOG_WARNING, "Unsupported mime type %s\n",
                                      &recvbuf[pos]);
            continue;
        }

        sap->sdp = av_strdup(&recvbuf[pos]);
        break;
    }

    av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", sap->sdp);
    ffio_init_context(&sap->sdp_pb, sap->sdp, strlen(sap->sdp), 0, NULL, NULL,
                  NULL, NULL);

    infmt = av_find_input_format("sdp");
    if (!infmt)
        goto fail;
    sap->sdp_ctx = avformat_alloc_context();
    if (!sap->sdp_ctx) {
        ret = AVERROR(ENOMEM);
        goto fail;
    }
    sap->sdp_ctx->max_delay = s->max_delay;
    sap->sdp_ctx->pb        = &sap->sdp_pb;
    sap->sdp_ctx->interrupt_callback = s->interrupt_callback;

    if ((ret = ff_copy_whitelists(sap->sdp_ctx, s)) < 0)
        goto fail;

    ret = avformat_open_input(&sap->sdp_ctx, "temp.sdp", infmt, NULL);
    if (ret < 0)
        goto fail;
    if (sap->sdp_ctx->ctx_flags & AVFMTCTX_NOHEADER)
        s->ctx_flags |= AVFMTCTX_NOHEADER;
    for (i = 0; i < sap->sdp_ctx->nb_streams; i++) {
        AVStream *st = avformat_new_stream(s, NULL);
        if (!st) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
        st->id = i;
        avcodec_copy_context(st->codec, sap->sdp_ctx->streams[i]->codec);
        st->time_base = sap->sdp_ctx->streams[i]->time_base;
    }

    return 0;

fail:
    sap_read_close(s);
    return ret;
}

static int sap_fetch_packet(AVFormatContext *s, AVPacket *pkt)
{
    struct SAPState *sap = s->priv_data;
    int fd = ffurl_get_file_handle(sap->ann_fd);
    int n, ret;
    struct pollfd p = {fd, POLLIN, 0};
    uint8_t recvbuf[RTP_MAX_PACKET_LENGTH];

    if (sap->eof)
        return AVERROR_EOF;

    while (1) {
        n = poll(&p, 1, 0);
        if (n <= 0 || !(p.revents & POLLIN))
            break;
        ret = ffurl_read(sap->ann_fd, recvbuf, sizeof(recvbuf));
        if (ret >= 8) {
            uint16_t hash = AV_RB16(&recvbuf[2]);
            /* Should ideally check the source IP address, too */
            if (recvbuf[0] & 0x04 && hash == sap->hash) {
                /* Stream deletion */
                sap->eof = 1;
                return AVERROR_EOF;
            }
        }
    }
    ret = av_read_frame(sap->sdp_ctx, pkt);
    if (ret < 0)
        return ret;
    if (s->ctx_flags & AVFMTCTX_NOHEADER) {
        while (sap->sdp_ctx->nb_streams > s->nb_streams) {
            int i = s->nb_streams;
            AVStream *st = avformat_new_stream(s, NULL);
            if (!st) {
                av_free_packet(pkt);
                return AVERROR(ENOMEM);
            }
            st->id = i;
            avcodec_copy_context(st->codec, sap->sdp_ctx->streams[i]->codec);
            st->time_base = sap->sdp_ctx->streams[i]->time_base;
        }
    }
    return ret;
}

AVInputFormat ff_sap_demuxer = {
    .name           = "sap",
    .long_name      = NULL_IF_CONFIG_SMALL("SAP input"),
    .priv_data_size = sizeof(struct SAPState),
    .read_probe     = sap_probe,
    .read_header    = sap_read_header,
    .read_packet    = sap_fetch_packet,
    .read_close     = sap_read_close,
    .flags          = AVFMT_NOFILE,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Session Announcement Protocol (RFC 2974) demuxer
	3	* Copyright (c) 2010 Martin Storsjo
	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	#include "avformat.h"
f6fa7814	23	#include "libavutil/avassert.h"
2ba45a60 DM	24	#include "libavutil/avstring.h"
	25	#include "libavutil/intreadwrite.h"
	26	#include "network.h"
	27	#include "os_support.h"
	28	#include "internal.h"
	29	#include "avio_internal.h"
	30	#include "url.h"
	31	#include "rtpdec.h"
	32	#if HAVE_POLL_H
	33	#include <poll.h>
	34	#endif
	35
	36	struct SAPState {
	37	URLContext *ann_fd;
	38	AVFormatContext *sdp_ctx;
	39	AVIOContext sdp_pb;
	40	uint16_t hash;
	41	char *sdp;
	42	int eof;
	43	};
	44
	45	static int sap_probe(AVProbeData *p)
	46	{
	47	if (av_strstart(p->filename, "sap:", NULL))
	48	return AVPROBE_SCORE_MAX;
	49	return 0;
	50	}
	51
	52	static int sap_read_close(AVFormatContext *s)
	53	{
	54	struct SAPState *sap = s->priv_data;
	55	if (sap->sdp_ctx)
	56	avformat_close_input(&sap->sdp_ctx);
	57	if (sap->ann_fd)
	58	ffurl_close(sap->ann_fd);
	59	av_freep(&sap->sdp);
	60	ff_network_close();
	61	return 0;
	62	}
	63
	64	static int sap_read_header(AVFormatContext *s)
	65	{
	66	struct SAPState *sap = s->priv_data;
	67	char host[1024], path[1024], url[1024];
	68	uint8_t recvbuf[RTP_MAX_PACKET_LENGTH];
	69	int port;
	70	int ret, i;
	71	AVInputFormat* infmt;
	72
	73	if (!ff_network_init())
	74	return AVERROR(EIO);
	75
	76	av_url_split(NULL, 0, NULL, 0, host, sizeof(host), &port,
	77	path, sizeof(path), s->filename);
	78	if (port < 0)
	79	port = 9875;
	80
	81	if (!host[0]) {
	82	/* Listen for announcements on sap.mcast.net if no host was specified */
	83	av_strlcpy(host, "224.2.127.254", sizeof(host));
	84	}
	85
	86	ff_url_join(url, sizeof(url), "udp", NULL, host, port, "?localport=%d",
	87	port);
88	ret = ffurl_open(&sap->ann_fd, url, AVIO_FLAG_READ,
89	&s->interrupt_callback, NULL);
90	if (ret)
91	goto fail;
92
93	while (1) {
94	int addr_type, auth_len;
95	int pos;
96
97	ret = ffurl_read(sap->ann_fd, recvbuf, sizeof(recvbuf) - 1);
98	if (ret == AVERROR(EAGAIN))
99	continue;
100	if (ret < 0)
101	goto fail;
102	recvbuf[ret] = '\0'; /* Null terminate for easier parsing */
103	if (ret < 8) {
104	av_log(s, AV_LOG_WARNING, "Received too short packet\n");
105	continue;
106	}
107
108	if ((recvbuf[0] & 0xe0) != 0x20) {
109	av_log(s, AV_LOG_WARNING, "Unsupported SAP version packet "
110	"received\n");
111	continue;
112	}
113
114	if (recvbuf[0] & 0x04) {
115	av_log(s, AV_LOG_WARNING, "Received stream deletion "
116	"announcement\n");
117	continue;
118	}
119	addr_type = recvbuf[0] & 0x10;
120	auth_len = recvbuf[1];
121	sap->hash = AV_RB16(&recvbuf[2]);
122	pos = 4;
123	if (addr_type)
124	pos += 16; /* IPv6 */
125	else
126	pos += 4; /* IPv4 */
127	pos += auth_len * 4;
128	if (pos + 4 >= ret) {
129	av_log(s, AV_LOG_WARNING, "Received too short packet\n");
130	continue;
131	}
132	#define MIME "application/sdp"
133	if (strcmp(&recvbuf[pos], MIME) == 0) {
134	pos += strlen(MIME) + 1;
135	} else if (strncmp(&recvbuf[pos], "v=0\r\n", 5) == 0) {
136	// Direct SDP without a mime type
137	} else {
138	av_log(s, AV_LOG_WARNING, "Unsupported mime type %s\n",
139	&recvbuf[pos]);
140	continue;
141	}
142
143	sap->sdp = av_strdup(&recvbuf[pos]);
144	break;
145	}
146
147	av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", sap->sdp);
148	ffio_init_context(&sap->sdp_pb, sap->sdp, strlen(sap->sdp), 0, NULL, NULL,
149	NULL, NULL);
150
151	infmt = av_find_input_format("sdp");
152	if (!infmt)
153	goto fail;
154	sap->sdp_ctx = avformat_alloc_context();
155	if (!sap->sdp_ctx) {
156	ret = AVERROR(ENOMEM);
157	goto fail;
158	}
159	sap->sdp_ctx->max_delay = s->max_delay;
160	sap->sdp_ctx->pb = &sap->sdp_pb;
161	sap->sdp_ctx->interrupt_callback = s->interrupt_callback;
f6fa7814 DM	162
	163	if ((ret = ff_copy_whitelists(sap->sdp_ctx, s)) < 0)
	164	goto fail;
	165
2ba45a60 DM	166	ret = avformat_open_input(&sap->sdp_ctx, "temp.sdp", infmt, NULL);
	167	if (ret < 0)
	168	goto fail;
	169	if (sap->sdp_ctx->ctx_flags & AVFMTCTX_NOHEADER)
	170	s->ctx_flags \|= AVFMTCTX_NOHEADER;
	171	for (i = 0; i < sap->sdp_ctx->nb_streams; i++) {
	172	AVStream *st = avformat_new_stream(s, NULL);
	173	if (!st) {
	174	ret = AVERROR(ENOMEM);
	175	goto fail;
	176	}
	177	st->id = i;
	178	avcodec_copy_context(st->codec, sap->sdp_ctx->streams[i]->codec);
	179	st->time_base = sap->sdp_ctx->streams[i]->time_base;
	180	}
	181
	182	return 0;
	183
	184	fail:
	185	sap_read_close(s);
	186	return ret;
	187	}
	188
	189	static int sap_fetch_packet(AVFormatContext s, AVPacket pkt)
	190	{
	191	struct SAPState *sap = s->priv_data;
	192	int fd = ffurl_get_file_handle(sap->ann_fd);
	193	int n, ret;
	194	struct pollfd p = {fd, POLLIN, 0};
	195	uint8_t recvbuf[RTP_MAX_PACKET_LENGTH];
	196
	197	if (sap->eof)
	198	return AVERROR_EOF;
	199
	200	while (1) {
	201	n = poll(&p, 1, 0);
	202	if (n <= 0 \|\| !(p.revents & POLLIN))
	203	break;
	204	ret = ffurl_read(sap->ann_fd, recvbuf, sizeof(recvbuf));
	205	if (ret >= 8) {
	206	uint16_t hash = AV_RB16(&recvbuf[2]);
	207	/* Should ideally check the source IP address, too */
	208	if (recvbuf[0] & 0x04 && hash == sap->hash) {
	209	/* Stream deletion */
	210	sap->eof = 1;
	211	return AVERROR_EOF;
	212	}
	213	}
	214	}
	215	ret = av_read_frame(sap->sdp_ctx, pkt);
	216	if (ret < 0)
	217	return ret;
	218	if (s->ctx_flags & AVFMTCTX_NOHEADER) {
	219	while (sap->sdp_ctx->nb_streams > s->nb_streams) {
	220	int i = s->nb_streams;
	221	AVStream *st = avformat_new_stream(s, NULL);
	222	if (!st) {
	223	av_free_packet(pkt);
	224	return AVERROR(ENOMEM);
	225	}
	226	st->id = i;
	227	avcodec_copy_context(st->codec, sap->sdp_ctx->streams[i]->codec);
	228	st->time_base = sap->sdp_ctx->streams[i]->time_base;
	229	}
230	}
231	return ret;
232	}
233
234	AVInputFormat ff_sap_demuxer = {
235	.name = "sap",
236	.long_name = NULL_IF_CONFIG_SMALL("SAP input"),
237	.priv_data_size = sizeof(struct SAPState),
238	.read_probe = sap_probe,
239	.read_header = sap_read_header,
240	.read_packet = sap_fetch_packet,
241	.read_close = sap_read_close,
242	.flags = AVFMT_NOFILE,
243	};