[libav.git] / libavformat / rtpdec_xiph.c

/*
 * RTP Theora Protocol
 * 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_theora.c
 * @brief Theora / RTP Code
 * @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/Theora specific private data.
 */
struct PayloadContext {
    unsigned ident;             ///< 24-bit stream configuration identifier
    uint32_t timestamp;
    ByteIOContext* fragment;    ///< buffer for split payloads
};

static PayloadContext *theora_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 theora_free_context(PayloadContext * data)
{
    free_fragment_if_needed(data);
    av_free(data);
}

static int theora_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 theora 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 Theora SDP configuration change detected\n");
        return AVERROR_PATCHWELCOME;
    }

    if (tdt) {
        av_log(ctx, AV_LOG_ERROR,
               "Unimplemented RTP Theora 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_NOMEM;
        }
        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 theora 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 theora data packet
            uint8_t* theora_data;
            int frame_size = url_close_dyn_buf(data->fragment, &theora_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_NOMEM;
            }

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

            av_free(theora_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 * theora_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);
    theora_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_NOMEM;
    }
    *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 theora_parse_fmtp_pair(AVCodecContext * codec,
                                  PayloadContext *theora_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,
                    theora_data);
            } else {
                av_log(codec, AV_LOG_ERROR,
                       "Out of memory while decoding SDP configuration.\n");
                result = AVERROR_NOMEM;
            }
        } else {
            av_log(codec, AV_LOG_ERROR, "Packet too large\n");
            result = AVERROR_INVALIDDATA;
        }
        av_free(decoded_packet);
    }
    return result;
}

static int theora_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(codec->id == CODEC_ID_THEORA);
    assert(data);

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

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