[libav.git] / libavformat / rtpdec_xiph.c

/*
 * Xiph RTP Protocols
 * Copyright (c) 2009 Colin McQuillian
 * Copyright (c) 2010 Josh Allmann
 *
 * 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
 */

/**
 * @file libavformat/rtpdec_xiph.c
 * @brief Xiph / RTP Code
 * @author Colin McQuillan <m.niloc@gmail.com>
 * @author Josh Allmann <joshua.allmann@gmail.com>
 */

#include "libavutil/avstring.h"
#include "libavutil/base64.h"
#include "libavcodec/bytestream.h"

#include <assert.h>

#include "rtpdec.h"
#include "rtpdec_xiph.h"

/**
 * RTP/Xiph specific private data.
 */
struct PayloadContext {
    unsigned ident;             ///< 24-bit stream configuration identifier
    uint32_t timestamp;
    ByteIOContext* fragment;    ///< buffer for split payloads
};

static PayloadContext *xiph_new_context(void)
{
    return av_mallocz(sizeof(PayloadContext));
}

static inline void free_fragment_if_needed(PayloadContext * data)
{
    if (data->fragment) {
        uint8_t* p;
        url_close_dyn_buf(data->fragment, &p);
        av_free(p);
        data->fragment = NULL;
    }
}

static void xiph_free_context(PayloadContext * data)
{
    free_fragment_if_needed(data);
    av_free(data);
}

static int xiph_handle_packet(AVFormatContext * ctx,
                              PayloadContext * data,
                              AVStream * st,
                              AVPacket * pkt,
                              uint32_t * timestamp,
                              const uint8_t * buf, int len, int flags)
{

    int ident, fragmented, tdt, num_pkts, pkt_len;

    if (len < 6) {
        av_log(ctx, AV_LOG_ERROR, "Invalid %d byte packet\n", len);
        return AVERROR_INVALIDDATA;
    }

    // read xiph rtp headers
    ident       = AV_RB24(buf);
    fragmented  = buf[3] >> 6;
    tdt         = (buf[3] >> 4) & 3;
    num_pkts    = buf[3] & 7;
    pkt_len     = AV_RB16(buf + 4);

    if (pkt_len > len - 6) {
        av_log(ctx, AV_LOG_ERROR,
               "Invalid packet length %d in %d byte packet\n", pkt_len,
               len);
        return AVERROR_INVALIDDATA;
    }

    if (ident != data->ident) {
        av_log(ctx, AV_LOG_ERROR,
               "Unimplemented Xiph SDP configuration change detected\n");
        return AVERROR_PATCHWELCOME;
    }

    if (tdt) {
        av_log(ctx, AV_LOG_ERROR,
               "Unimplemented RTP Xiph packet settings (%d,%d,%d)\n",
               fragmented, tdt, num_pkts);
        return AVERROR_PATCHWELCOME;
    }

    buf += 6; // move past header bits
    len -= 6;

    if (fragmented == 0) {
        // whole frame(s)
        int i, data_len, write_len;
        buf -= 2;
        len += 2;

        // fast first pass to calculate total length
        for (i = 0, data_len = 0;  (i < num_pkts) && (len >= 2);  i++) {
            int off   = data_len + (i << 1);
            pkt_len   = AV_RB16(buf + off);
            data_len += pkt_len;
            len      -= pkt_len + 2;
        }

        if (len < 0 || i < num_pkts) {
            av_log(ctx, AV_LOG_ERROR,
                   "Bad packet: %d bytes left at frame %d of %d\n",
                   len, i, num_pkts);
            return AVERROR_INVALIDDATA;
        }

        if (av_new_packet(pkt, data_len)) {
            av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
            return AVERROR(ENOMEM);
        }
        pkt->stream_index = st->index;

        // concatenate frames
        for (i = 0, write_len = 0; write_len < data_len; i++) {
            pkt_len = AV_RB16(buf);
            buf += 2;
            memcpy(pkt->data + write_len, buf, pkt_len);
            write_len += pkt_len;
            buf += pkt_len;
        }
        assert(write_len == data_len);

        return 0;

    } else if (fragmented == 1) {
        // start of xiph data fragment
        int res;

        // end packet has been lost somewhere, so drop buffered data
        free_fragment_if_needed(data);

        if((res = url_open_dyn_buf(&data->fragment)) < 0)
            return res;

        put_buffer(data->fragment, buf, pkt_len);
        data->timestamp = *timestamp;

    } else {
        assert(fragmented < 4);
        if (data->timestamp != *timestamp) {
            // skip if fragmented timestamp is incorrect;
            // a start packet has been lost somewhere
            free_fragment_if_needed(data);
            av_log(ctx, AV_LOG_ERROR, "RTP timestamps don't match!\n");
            return AVERROR_INVALIDDATA;
        }

        // copy data to fragment buffer
        put_buffer(data->fragment, buf, pkt_len);

        if (fragmented == 3) {
            // end of xiph data packet
            uint8_t* xiph_data;
            int frame_size = url_close_dyn_buf(data->fragment, &xiph_data);

            if (frame_size < 0) {
                av_log(ctx, AV_LOG_ERROR,
                       "Error occurred when getting fragment buffer.");
                return frame_size;
            }

            if (av_new_packet(pkt, frame_size)) {
                av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
                return AVERROR(ENOMEM);
            }

            memcpy(pkt->data, xiph_data, frame_size);
            pkt->stream_index = st->index;

            av_free(xiph_data);
            data->fragment = NULL;

            return 0;
        }
    }

   return AVERROR(EAGAIN);
}

/**
 * Length encoding described in RFC5215 section 3.1.1.
 */
static int get_base128(const uint8_t ** buf, const uint8_t * buf_end)
{
    int n = 0;
    for (; *buf < buf_end; ++*buf) {
        n <<= 7;
        n += **buf & 0x7f;
        if (!(**buf & 0x80)) {
            ++*buf;
            return n;
        }
    }
    return 0;
}

/**
 * Based off parse_packed_headers in Vorbis RTP
 */
static unsigned int
parse_packed_headers(const uint8_t * packed_headers,
                     const uint8_t * packed_headers_end,
                     AVCodecContext * codec, PayloadContext * xiph_data)
{

    unsigned num_packed, num_headers, length, length1, length2, extradata_alloc;
    uint8_t *ptr;

    if (packed_headers_end - packed_headers < 9) {
        av_log(codec, AV_LOG_ERROR,
               "Invalid %d byte packed header.",
               packed_headers_end - packed_headers);
        return AVERROR_INVALIDDATA;
    }

    num_packed         = bytestream_get_be32(&packed_headers);
    xiph_data->ident   = bytestream_get_be24(&packed_headers);
    length             = bytestream_get_be16(&packed_headers);
    num_headers        = get_base128(&packed_headers, packed_headers_end);
    length1            = get_base128(&packed_headers, packed_headers_end);
    length2            = get_base128(&packed_headers, packed_headers_end);

    if (num_packed != 1 || num_headers > 3) {
        av_log(codec, AV_LOG_ERROR,
               "Unimplemented number of headers: %d packed headers, %d headers\n",
               num_packed, num_headers);
        return AVERROR_PATCHWELCOME;
    }

    if (packed_headers_end - packed_headers != length ||
        length1 > length || length2 > length - length1) {
        av_log(codec, AV_LOG_ERROR,
               "Bad packed header lengths (%d,%d,%d,%d)\n", length1,
               length2, packed_headers_end - packed_headers, length);
        return AVERROR_INVALIDDATA;
    }

    /* allocate extra space:
     * -- length/255 +2 for xiphlacing
     * -- one for the '2' marker
     * -- FF_INPUT_BUFFER_PADDING_SIZE required */
    extradata_alloc = length + length/255 + 3 + FF_INPUT_BUFFER_PADDING_SIZE;

    ptr = codec->extradata = av_malloc(extradata_alloc);
    if (!ptr) {
        av_log(codec, AV_LOG_ERROR, "Out of memory\n");
        return AVERROR(ENOMEM);
    }
    *ptr++ = 2;
    ptr += av_xiphlacing(ptr, length1);
    ptr += av_xiphlacing(ptr, length2);
    memcpy(ptr, packed_headers, length);
    ptr += length;
    codec->extradata_size = ptr - codec->extradata;
    // clear out remaining parts of the buffer
    memset(ptr, 0, extradata_alloc - codec->extradata_size);

    return 0;
}

static int xiph_parse_fmtp_pair(AVCodecContext * codec,
                                PayloadContext *xiph_data,
                                char *attr, char *value)
{
    int result = 0;

    if (!strcmp(attr, "sampling")) {
        return AVERROR_PATCHWELCOME;
    } else if (!strcmp(attr, "width")) {
        /* This is an integer between 1 and 1048561
         * and MUST be in multiples of 16. */
        codec->width = atoi(value);
        return 0;
    } else if (!strcmp(attr, "height")) {
        /* This is an integer between 1 and 1048561
         * and MUST be in multiples of 16. */
        codec->height = atoi(value);
        return 0;
    } else if (!strcmp(attr, "delivery-method")) {
        /* Possible values are: inline, in_band, out_band/specific_name. */
        return AVERROR_PATCHWELCOME;
    } else if (!strcmp(attr, "configuration-uri")) {
        /* NOTE: configuration-uri is supported only under 2 conditions:
         *--after the delivery-method tag
         * --with a delivery-method value of out_band */
        return AVERROR_PATCHWELCOME;
    } else if (!strcmp(attr, "configuration")) {
        /* NOTE: configuration is supported only AFTER the delivery-method tag
         * The configuration value is a base64 encoded packed header */
        uint8_t *decoded_packet = NULL;
        int packet_size;
        size_t decoded_alloc = strlen(value) / 4 * 3 + 4;

        if (decoded_alloc <= INT_MAX) {
            decoded_packet = av_malloc(decoded_alloc);
            if (decoded_packet) {
                packet_size =
                    av_base64_decode(decoded_packet, value, decoded_alloc);

                result = parse_packed_headers
                    (decoded_packet, decoded_packet + packet_size, codec,
                    xiph_data);
            } else {
                av_log(codec, AV_LOG_ERROR,
                       "Out of memory while decoding SDP configuration.\n");
                result = AVERROR(ENOMEM);
            }
        } else {
            av_log(codec, AV_LOG_ERROR, "Packet too large\n");
            result = AVERROR_INVALIDDATA;
        }
        av_free(decoded_packet);
    }
    return result;
}

static int xiph_parse_sdp_line(AVFormatContext *s, int st_index,
                                 PayloadContext *data, const char *line)
{
    const char *p;
    char *value;
    char attr[25];
    int value_size = strlen(line), attr_size = sizeof(attr), res = 0;
    AVCodecContext* codec = s->streams[st_index]->codec;

    assert(data);

    if (!(value = av_malloc(value_size))) {
        av_log(codec, AV_LOG_ERROR, "Out of memory\n");
        return AVERROR(ENOMEM);
    }

    if (av_strstart(line, "fmtp:", &p)) {
        // remove protocol identifier
        while (*p && *p == ' ') p++; // strip spaces
        while (*p && *p != ' ') p++; // eat protocol identifier
        while (*p && *p == ' ') p++; // strip trailing spaces

        while (ff_rtsp_next_attr_and_value(&p,
                                           attr, attr_size,
                                           value, value_size)) {
            res = xiph_parse_fmtp_pair(codec, data, attr, value);
            if (res < 0 && res != AVERROR_PATCHWELCOME)
                return res;
        }
    }

    av_free(value);
    return 0;
}

RTPDynamicProtocolHandler ff_theora_dynamic_handler = {
    .enc_name         = "theora",
    .codec_type       = AVMEDIA_TYPE_VIDEO,
    .codec_id         = CODEC_ID_THEORA,
    .parse_sdp_a_line = xiph_parse_sdp_line,
    .open             = xiph_new_context,
    .close            = xiph_free_context,
    .parse_packet     = xiph_handle_packet
};

RTPDynamicProtocolHandler ff_vorbis_dynamic_handler = {
    .enc_name         = "vorbis",
    .codec_type       = AVMEDIA_TYPE_AUDIO,
    .codec_id         = CODEC_ID_VORBIS,
    .parse_sdp_a_line = xiph_parse_sdp_line,
    .open             = xiph_new_context,
    .close            = xiph_free_context,
    .parse_packet     = xiph_handle_packet
};
Commit	Line	Data
887af2aa	1	/*
96070b8b	2	* Xiph RTP Protocols
339f5f39	3	* Copyright (c) 2009 Colin McQuillian
887af2aa JA	4	* Copyright (c) 2010 Josh Allmann
	5	*
	6	* This file is part of FFmpeg.
	7	*
	8	* FFmpeg is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
	10	* License as published by the Free Software Foundation; either
	11	* version 2.1 of the License, or (at your option) any later version.
	12	*
	13	* FFmpeg is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public
	19	* License along with FFmpeg; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
	23	/**
96070b8b JA	24	* @file libavformat/rtpdec_xiph.c
96070b8b JA	25	* @brief Xiph / RTP Code
339f5f39	26	* @author Colin McQuillan <m.niloc@gmail.com>
887af2aa JA	27	* @author Josh Allmann <joshua.allmann@gmail.com>
	28	*/
	29
	30	#include "libavutil/avstring.h"
	31	#include "libavutil/base64.h"
	32	#include "libavcodec/bytestream.h"
	33
	34	#include <assert.h>
	35
	36	#include "rtpdec.h"
06a36faf	37	#include "rtpdec_xiph.h"
887af2aa JA	38
887af2aa JA	39	/**
96070b8b	40	* RTP/Xiph specific private data.
887af2aa JA	41	*/
	42	struct PayloadContext {
	43	unsigned ident; ///< 24-bit stream configuration identifier
	44	uint32_t timestamp;
	45	ByteIOContext* fragment; ///< buffer for split payloads
	46	};
	47
96070b8b	48	static PayloadContext *xiph_new_context(void)
887af2aa JA	49	{
	50	return av_mallocz(sizeof(PayloadContext));
	51	}
	52
	53	static inline void free_fragment_if_needed(PayloadContext * data)
	54	{
	55	if (data->fragment) {
	56	uint8_t* p;
	57	url_close_dyn_buf(data->fragment, &p);
	58	av_free(p);
	59	data->fragment = NULL;
	60	}
	61	}
	62
96070b8b	63	static void xiph_free_context(PayloadContext * data)
887af2aa JA	64	{
	65	free_fragment_if_needed(data);
	66	av_free(data);
	67	}
	68
96070b8b	69	static int xiph_handle_packet(AVFormatContext * ctx,
cb92a9c0 JA	70	PayloadContext * data,
	71	AVStream * st,
	72	AVPacket * pkt,
	73	uint32_t * timestamp,
	74	const uint8_t * buf, int len, int flags)
887af2aa JA	75	{
	76
	77	int ident, fragmented, tdt, num_pkts, pkt_len;
	78
	79	if (len < 6) {
	80	av_log(ctx, AV_LOG_ERROR, "Invalid %d byte packet\n", len);
	81	return AVERROR_INVALIDDATA;
	82	}
	83
96070b8b	84	// read xiph rtp headers
887af2aa JA	85	ident = AV_RB24(buf);
	86	fragmented = buf[3] >> 6;
	87	tdt = (buf[3] >> 4) & 3;
	88	num_pkts = buf[3] & 7;
	89	pkt_len = AV_RB16(buf + 4);
	90
	91	if (pkt_len > len - 6) {
	92	av_log(ctx, AV_LOG_ERROR,
	93	"Invalid packet length %d in %d byte packet\n", pkt_len,
	94	len);
	95	return AVERROR_INVALIDDATA;
	96	}
	97
	98	if (ident != data->ident) {
	99	av_log(ctx, AV_LOG_ERROR,
96070b8b	100	"Unimplemented Xiph SDP configuration change detected\n");
887af2aa JA	101	return AVERROR_PATCHWELCOME;
	102	}
	103
	104	if (tdt) {
	105	av_log(ctx, AV_LOG_ERROR,
96070b8b	106	"Unimplemented RTP Xiph packet settings (%d,%d,%d)\n",
887af2aa JA	107	fragmented, tdt, num_pkts);
	108	return AVERROR_PATCHWELCOME;
	109	}
	110
	111	buf += 6; // move past header bits
	112	len -= 6;
	113
	114	if (fragmented == 0) {
	115	// whole frame(s)
	116	int i, data_len, write_len;
	117	buf -= 2;
	118	len += 2;
	119
	120	// fast first pass to calculate total length
	121	for (i = 0, data_len = 0; (i < num_pkts) && (len >= 2); i++) {
	122	int off = data_len + (i << 1);
	123	pkt_len = AV_RB16(buf + off);
	124	data_len += pkt_len;
	125	len -= pkt_len + 2;
	126	}
	127
	128	if (len < 0 \|\| i < num_pkts) {
	129	av_log(ctx, AV_LOG_ERROR,
	130	"Bad packet: %d bytes left at frame %d of %d\n",
	131	len, i, num_pkts);
	132	return AVERROR_INVALIDDATA;
	133	}
	134
	135	if (av_new_packet(pkt, data_len)) {
	136	av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
2874c81c	137	return AVERROR(ENOMEM);
887af2aa JA	138	}
	139	pkt->stream_index = st->index;
	140
	141	// concatenate frames
	142	for (i = 0, write_len = 0; write_len < data_len; i++) {
	143	pkt_len = AV_RB16(buf);
	144	buf += 2;
	145	memcpy(pkt->data + write_len, buf, pkt_len);
	146	write_len += pkt_len;
	147	buf += pkt_len;
	148	}
	149	assert(write_len == data_len);
	150
	151	return 0;
	152
	153	} else if (fragmented == 1) {
96070b8b	154	// start of xiph data fragment
887af2aa JA	155	int res;
	156
	157	// end packet has been lost somewhere, so drop buffered data
	158	free_fragment_if_needed(data);
	159
	160	if((res = url_open_dyn_buf(&data->fragment)) < 0)
	161	return res;
	162
	163	put_buffer(data->fragment, buf, pkt_len);
	164	data->timestamp = *timestamp;
	165
	166	} else {
	167	assert(fragmented < 4);
	168	if (data->timestamp != *timestamp) {
	169	// skip if fragmented timestamp is incorrect;
	170	// a start packet has been lost somewhere
	171	free_fragment_if_needed(data);
	172	av_log(ctx, AV_LOG_ERROR, "RTP timestamps don't match!\n");
	173	return AVERROR_INVALIDDATA;
	174	}
	175
	176	// copy data to fragment buffer
	177	put_buffer(data->fragment, buf, pkt_len);
	178
	179	if (fragmented == 3) {
96070b8b JA	180	// end of xiph data packet
	181	uint8_t* xiph_data;
	182	int frame_size = url_close_dyn_buf(data->fragment, &xiph_data);
887af2aa JA	183
	184	if (frame_size < 0) {
	185	av_log(ctx, AV_LOG_ERROR,
	186	"Error occurred when getting fragment buffer.");
	187	return frame_size;
	188	}
	189
	190	if (av_new_packet(pkt, frame_size)) {
	191	av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
2874c81c	192	return AVERROR(ENOMEM);
887af2aa JA	193	}
887af2aa JA	194
96070b8b	195	memcpy(pkt->data, xiph_data, frame_size);
887af2aa JA	196	pkt->stream_index = st->index;
887af2aa JA	197
96070b8b	198	av_free(xiph_data);
887af2aa JA	199	data->fragment = NULL;
	200
	201	return 0;
	202	}
	203	}
	204
	205	return AVERROR(EAGAIN);
	206	}
	207
	208	/**
	209	* Length encoding described in RFC5215 section 3.1.1.
	210	*/
	211	static int get_base128(const uint8_t ** buf, const uint8_t * buf_end)
	212	{
	213	int n = 0;
	214	for (; buf < buf_end; ++buf) {
	215	n <<= 7;
	216	n += **buf & 0x7f;
	217	if (!(**buf & 0x80)) {
	218	++*buf;
	219	return n;
	220	}
	221	}
	222	return 0;
	223	}
	224
	225	/**
	226	* Based off parse_packed_headers in Vorbis RTP
	227	*/
	228	static unsigned int
	229	parse_packed_headers(const uint8_t * packed_headers,
	230	const uint8_t * packed_headers_end,
96070b8b	231	AVCodecContext * codec, PayloadContext * xiph_data)
887af2aa JA	232	{
	233
	234	unsigned num_packed, num_headers, length, length1, length2, extradata_alloc;
	235	uint8_t *ptr;
	236
	237	if (packed_headers_end - packed_headers < 9) {
	238	av_log(codec, AV_LOG_ERROR,
	239	"Invalid %d byte packed header.",
	240	packed_headers_end - packed_headers);
	241	return AVERROR_INVALIDDATA;
	242	}
	243
	244	num_packed = bytestream_get_be32(&packed_headers);
96070b8b	245	xiph_data->ident = bytestream_get_be24(&packed_headers);
887af2aa JA	246	length = bytestream_get_be16(&packed_headers);
	247	num_headers = get_base128(&packed_headers, packed_headers_end);
	248	length1 = get_base128(&packed_headers, packed_headers_end);
	249	length2 = get_base128(&packed_headers, packed_headers_end);
	250
	251	if (num_packed != 1 \|\| num_headers > 3) {
	252	av_log(codec, AV_LOG_ERROR,
	253	"Unimplemented number of headers: %d packed headers, %d headers\n",
	254	num_packed, num_headers);
	255	return AVERROR_PATCHWELCOME;
	256	}
	257
	258	if (packed_headers_end - packed_headers != length \|\|
	259	length1 > length \|\| length2 > length - length1) {
	260	av_log(codec, AV_LOG_ERROR,
	261	"Bad packed header lengths (%d,%d,%d,%d)\n", length1,
	262	length2, packed_headers_end - packed_headers, length);
	263	return AVERROR_INVALIDDATA;
	264	}
	265
	266	/* allocate extra space:
	267	* -- length/255 +2 for xiphlacing
	268	* -- one for the '2' marker
	269	* -- FF_INPUT_BUFFER_PADDING_SIZE required */
	270	extradata_alloc = length + length/255 + 3 + FF_INPUT_BUFFER_PADDING_SIZE;
	271
	272	ptr = codec->extradata = av_malloc(extradata_alloc);
	273	if (!ptr) {
	274	av_log(codec, AV_LOG_ERROR, "Out of memory\n");
2874c81c	275	return AVERROR(ENOMEM);
887af2aa JA	276	}
	277	*ptr++ = 2;
	278	ptr += av_xiphlacing(ptr, length1);
	279	ptr += av_xiphlacing(ptr, length2);
	280	memcpy(ptr, packed_headers, length);
	281	ptr += length;
	282	codec->extradata_size = ptr - codec->extradata;
	283	// clear out remaining parts of the buffer
	284	memset(ptr, 0, extradata_alloc - codec->extradata_size);
	285
	286	return 0;
	287	}
	288
96070b8b JA	289	static int xiph_parse_fmtp_pair(AVCodecContext * codec,
96070b8b JA	290	PayloadContext *xiph_data,
cb92a9c0	291	char attr, char value)
887af2aa JA	292	{
	293	int result = 0;
	294
	295	if (!strcmp(attr, "sampling")) {
	296	return AVERROR_PATCHWELCOME;
	297	} else if (!strcmp(attr, "width")) {
	298	/* This is an integer between 1 and 1048561
	299	* and MUST be in multiples of 16. */
	300	codec->width = atoi(value);
	301	return 0;
	302	} else if (!strcmp(attr, "height")) {
	303	/* This is an integer between 1 and 1048561
	304	* and MUST be in multiples of 16. */
	305	codec->height = atoi(value);
	306	return 0;
	307	} else if (!strcmp(attr, "delivery-method")) {
	308	/* Possible values are: inline, in_band, out_band/specific_name. */
	309	return AVERROR_PATCHWELCOME;
	310	} else if (!strcmp(attr, "configuration-uri")) {
	311	/* NOTE: configuration-uri is supported only under 2 conditions:
	312	*--after the delivery-method tag
	313	* --with a delivery-method value of out_band */
	314	return AVERROR_PATCHWELCOME;
	315	} else if (!strcmp(attr, "configuration")) {
	316	/* NOTE: configuration is supported only AFTER the delivery-method tag
	317	* The configuration value is a base64 encoded packed header */
	318	uint8_t *decoded_packet = NULL;
	319	int packet_size;
	320	size_t decoded_alloc = strlen(value) / 4 * 3 + 4;
	321
	322	if (decoded_alloc <= INT_MAX) {
	323	decoded_packet = av_malloc(decoded_alloc);
	324	if (decoded_packet) {
	325	packet_size =
	326	av_base64_decode(decoded_packet, value, decoded_alloc);
	327
	328	result = parse_packed_headers
	329	(decoded_packet, decoded_packet + packet_size, codec,
96070b8b	330	xiph_data);
887af2aa JA	331	} else {
	332	av_log(codec, AV_LOG_ERROR,
	333	"Out of memory while decoding SDP configuration.\n");
2874c81c	334	result = AVERROR(ENOMEM);
887af2aa JA	335	}
	336	} else {
	337	av_log(codec, AV_LOG_ERROR, "Packet too large\n");
	338	result = AVERROR_INVALIDDATA;
	339	}
	340	av_free(decoded_packet);
	341	}
	342	return result;
	343	}
	344
96070b8b	345	static int xiph_parse_sdp_line(AVFormatContext *s, int st_index,
887af2aa JA	346	PayloadContext data, const char line)
	347	{
	348	const char *p;
	349	char *value;
	350	char attr[25];
	351	int value_size = strlen(line), attr_size = sizeof(attr), res = 0;
	352	AVCodecContext* codec = s->streams[st_index]->codec;
	353
887af2aa JA	354	assert(data);
	355
	356	if (!(value = av_malloc(value_size))) {
	357	av_log(codec, AV_LOG_ERROR, "Out of memory\n");
2874c81c	358	return AVERROR(ENOMEM);
887af2aa JA	359	}
	360
	361	if (av_strstart(line, "fmtp:", &p)) {
	362	// remove protocol identifier
	363	while (p && p == ' ') p++; // strip spaces
	364	while (p && p != ' ') p++; // eat protocol identifier
	365	while (p && p == ' ') p++; // strip trailing spaces
	366
	367	while (ff_rtsp_next_attr_and_value(&p,
	368	attr, attr_size,
	369	value, value_size)) {
96070b8b	370	res = xiph_parse_fmtp_pair(codec, data, attr, value);
887af2aa JA	371	if (res < 0 && res != AVERROR_PATCHWELCOME)
	372	return res;
	373	}
	374	}
	375
	376	av_free(value);
	377	return 0;
	378	}
	379
	380	RTPDynamicProtocolHandler ff_theora_dynamic_handler = {
	381	.enc_name = "theora",
72415b2a	382	.codec_type = AVMEDIA_TYPE_VIDEO,
887af2aa	383	.codec_id = CODEC_ID_THEORA,
96070b8b JA	384	.parse_sdp_a_line = xiph_parse_sdp_line,
	385	.open = xiph_new_context,
	386	.close = xiph_free_context,
	387	.parse_packet = xiph_handle_packet
887af2aa	388	};
339f5f39 JA	389
	390	RTPDynamicProtocolHandler ff_vorbis_dynamic_handler = {
	391	.enc_name = "vorbis",
4bebf2cf	392	.codec_type = AVMEDIA_TYPE_AUDIO,
339f5f39 JA	393	.codec_id = CODEC_ID_VORBIS,
	394	.parse_sdp_a_line = xiph_parse_sdp_line,
	395	.open = xiph_new_context,
	396	.close = xiph_free_context,
	397	.parse_packet = xiph_handle_packet
	398	};