/src/ffmpeg/libavformat/rtpdec_mpeg4.c

Source
/*
 * Common code for the RTP depacketization of MPEG-4 formats.
 * Copyright (c) 2010 Fabrice Bellard
 *                    Romain Degez
 *
 * 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
 * @brief MPEG-4 / RTP Code
 * @author Fabrice Bellard
 * @author Romain Degez
 */

#include "rtpdec_formats.h"
#include "internal.h"
#include "libavutil/attributes.h"
#include "libavutil/avstring.h"
#include "libavutil/mem.h"
#include "libavcodec/get_bits.h"

#define MAX_AAC_HBR_FRAME_SIZE 8191

/** Structure listing useful vars to parse RTP packet payload */
struct PayloadContext {
    int bitrate;
    int sizelength;
    int indexlength;
    int indexdeltalength;
    int profile_level_id;
    int streamtype;
    int objecttype;
    char *mode;

    /** mpeg 4 AU headers */
    struct AUHeaders {
        int size;
        int index;
        int cts_flag;
        int cts;
        int dts_flag;
        int dts;
        int rap_flag;
        int streamstate;
    } *au_headers;
    int au_headers_allocated;
    int nb_au_headers;
    int au_headers_length_bytes;
    int cur_au_index;

    uint8_t buf[FFMAX(RTP_MAX_PACKET_LENGTH, MAX_AAC_HBR_FRAME_SIZE)];
    int buf_pos, buf_size;
    uint32_t timestamp;
};

typedef struct AttrNameMap {
    const char *str;
    uint16_t    type;
    uint32_t    offset;

    /** Range for integer values */
    struct Range {
        int min;
        int max;
    } range;
} AttrNameMap;

/* All known fmtp parameters and the corresponding RTPAttrTypeEnum */
#define ATTR_NAME_TYPE_INT 0
#define ATTR_NAME_TYPE_STR 1
static const AttrNameMap attr_names[] = {
    { "bitrate",       ATTR_NAME_TYPE_INT,
      offsetof(PayloadContext, bitrate),
      {0, INT32_MAX} },
    { "SizeLength",       ATTR_NAME_TYPE_INT,
      offsetof(PayloadContext, sizelength),
      {0, 32} }, // SizeLength number of bits used to encode AU-size integer value
    { "IndexLength",      ATTR_NAME_TYPE_INT,
      offsetof(PayloadContext, indexlength),
      {0, 32} }, // IndexLength number of bits used to encode AU-Index integer value
    { "IndexDeltaLength", ATTR_NAME_TYPE_INT,
      offsetof(PayloadContext, indexdeltalength),
      {0, 32} }, // IndexDeltaLength number of bits to encode AU-Index-delta integer value
    { "profile-level-id", ATTR_NAME_TYPE_INT,
      offsetof(PayloadContext, profile_level_id),
      {INT32_MIN, INT32_MAX} }, // It differs depending on StreamType
    { "StreamType",       ATTR_NAME_TYPE_INT,
      offsetof(PayloadContext, streamtype),
      {0x00, 0x3F} }, // Values from ISO/IEC 14496-1, 'StreamType Values' table
    { "mode",             ATTR_NAME_TYPE_STR,
      offsetof(PayloadContext, mode),
       {0} },
    { NULL, -1, -1, {0} },
};

static void close_context(PayloadContext *data)
{
    av_freep(&data->au_headers);
    av_freep(&data->mode);
}

static int parse_fmtp_config(AVCodecParameters *par, const char *value)
{
    /* decode the hexa encoded parameter */
    int len = ff_hex_to_data(NULL, value), ret;

    if ((ret = ff_alloc_extradata(par, len)) < 0)
        return ret;
    ff_hex_to_data(par->extradata, value);
    return 0;
}

static int rtp_parse_mp4_au(PayloadContext *data, const uint8_t *buf, int len)
{
    int au_headers_length, au_header_size, i;
    GetBitContext getbitcontext;
    int ret;

    if (len < 2)
        return AVERROR_INVALIDDATA;

    /* decode the first 2 bytes where the AUHeader sections are stored
       length in bits */
    au_headers_length = AV_RB16(buf);

    if (au_headers_length > RTP_MAX_PACKET_LENGTH)
      return -1;

    data->au_headers_length_bytes = (au_headers_length + 7) / 8;

    /* skip AU headers length section (2 bytes) */
    buf += 2;
    len -= 2;

    if (len < data->au_headers_length_bytes)
        return AVERROR_INVALIDDATA;

    ret = init_get_bits(&getbitcontext, buf, data->au_headers_length_bytes * 8);
    if (ret < 0)
        return ret;

    /* XXX: Wrong if optional additional sections are present (cts, dts etc...) */
    au_header_size = data->sizelength + data->indexlength;
    if (au_header_size <= 0 || (au_headers_length % au_header_size != 0))
        return -1;

    data->nb_au_headers = au_headers_length / au_header_size;
    if (!data->au_headers || data->au_headers_allocated < data->nb_au_headers) {
        av_free(data->au_headers);
        data->au_headers = av_malloc(sizeof(struct AUHeaders) * data->nb_au_headers);
        if (!data->au_headers)
            return AVERROR(ENOMEM);
        data->au_headers_allocated = data->nb_au_headers;
    }

    for (i = 0; i < data->nb_au_headers; ++i) {
        data->au_headers[i].size  = get_bits_long(&getbitcontext, data->sizelength);
        data->au_headers[i].index = get_bits_long(&getbitcontext, data->indexlength);
    }

    return 0;
}


/* Follows RFC 3640 */
static int aac_parse_packet(AVFormatContext *ctx, PayloadContext *data,
                            AVStream *st, AVPacket *pkt, uint32_t *timestamp,
                            const uint8_t *buf, int len, uint16_t seq,
                            int flags)
{
    int ret;


    if (!buf) {
        if (data->cur_au_index > data->nb_au_headers) {
            av_log(ctx, AV_LOG_ERROR, "Invalid parser state\n");
            return AVERROR_INVALIDDATA;
        }
        if (data->buf_size - data->buf_pos < data->au_headers[data->cur_au_index].size) {
            av_log(ctx, AV_LOG_ERROR, "Invalid AU size\n");
            return AVERROR_INVALIDDATA;
        }
        if ((ret = av_new_packet(pkt, data->au_headers[data->cur_au_index].size)) < 0) {
            av_log(ctx, AV_LOG_ERROR, "Out of memory\n");
            return ret;
        }
        memcpy(pkt->data, &data->buf[data->buf_pos], data->au_headers[data->cur_au_index].size);
        data->buf_pos += data->au_headers[data->cur_au_index].size;
        pkt->stream_index = st->index;
        data->cur_au_index++;

        if (data->cur_au_index == data->nb_au_headers) {
            data->buf_pos = 0;
            return 0;
        }

        return 1;
    }

    if (rtp_parse_mp4_au(data, buf, len)) {
        av_log(ctx, AV_LOG_ERROR, "Error parsing AU headers\n");
        return -1;
    }

    buf += data->au_headers_length_bytes + 2;
    len -= data->au_headers_length_bytes + 2;
    if (data->nb_au_headers == 1 && len < data->au_headers[0].size) {
        /* Packet is fragmented */

        if (!data->buf_pos) {
            if (data->au_headers[0].size > MAX_AAC_HBR_FRAME_SIZE) {
                av_log(ctx, AV_LOG_ERROR, "Invalid AU size\n");
                return AVERROR_INVALIDDATA;
            }

            data->buf_size = data->au_headers[0].size;
            data->timestamp = *timestamp;
        }

        if (data->timestamp != *timestamp ||
            data->au_headers[0].size != data->buf_size ||
            data->buf_pos + len > MAX_AAC_HBR_FRAME_SIZE) {
            data->buf_pos = 0;
            data->buf_size = 0;
            av_log(ctx, AV_LOG_ERROR, "Invalid packet received\n");
            return AVERROR_INVALIDDATA;
        }

        memcpy(&data->buf[data->buf_pos], buf, len);
        data->buf_pos += len;

        if (!(flags & RTP_FLAG_MARKER))
            return AVERROR(EAGAIN);

        if (data->buf_pos != data->buf_size) {
            data->buf_pos = 0;
            av_log(ctx, AV_LOG_ERROR, "Missed some packets, discarding frame\n");
            return AVERROR_INVALIDDATA;
        }

        data->buf_pos = 0;
        ret = av_new_packet(pkt, data->buf_size);
        if (ret < 0) {
            av_log(ctx, AV_LOG_ERROR, "Out of memory\n");
            return ret;
        }
        pkt->stream_index = st->index;

        memcpy(pkt->data, data->buf, data->buf_size);

        return 0;
    }

    if (len < data->au_headers[0].size) {
        av_log(ctx, AV_LOG_ERROR, "First AU larger than packet size\n");
        return AVERROR_INVALIDDATA;
    }
    if ((ret = av_new_packet(pkt, data->au_headers[0].size)) < 0) {
        av_log(ctx, AV_LOG_ERROR, "Out of memory\n");
        return ret;
    }
    memcpy(pkt->data, buf, data->au_headers[0].size);
    len -= data->au_headers[0].size;
    buf += data->au_headers[0].size;
    pkt->stream_index = st->index;

    if (len > 0 && data->nb_au_headers > 1) {
        data->buf_size = FFMIN(len, sizeof(data->buf));
        memcpy(data->buf, buf, data->buf_size);
        data->cur_au_index = 1;
        data->buf_pos = 0;
        return 1;
    }

    return 0;
}

static int parse_fmtp(AVFormatContext *s,
                      AVStream *stream, PayloadContext *data,
                      const char *attr, const char *value)
{
    AVCodecParameters *par = stream->codecpar;
    int res, i;

    if (!strcmp(attr, "config")) {
        res = parse_fmtp_config(par, value);

        if (res < 0)
            return res;
    }

    if (par->codec_id == AV_CODEC_ID_AAC) {
        /* Looking for a known attribute */
        for (i = 0; attr_names[i].str; ++i) {
            if (!av_strcasecmp(attr, attr_names[i].str)) {
                if (attr_names[i].type == ATTR_NAME_TYPE_INT) {
                    char *end_ptr = NULL;
                    long long int val = strtoll(value, &end_ptr, 10);
                    if (end_ptr == value || end_ptr[0] != '\0') {
                        av_log(s, AV_LOG_ERROR,
                               "The %s field value is not a valid number: %s\n",
                               attr, value);
                        return AVERROR_INVALIDDATA;
                    }
                    if (val < attr_names[i].range.min ||
                        val > attr_names[i].range.max) {
                        av_log(s, AV_LOG_ERROR,
                            "fmtp field %s should be in range [%d,%d] (provided value: %lld)",
                            attr, attr_names[i].range.min, attr_names[i].range.max, val);
                        return  AVERROR_INVALIDDATA;
                    }

                    *(int *)((char *)data+
                        attr_names[i].offset) = (int) val;
                } else if (attr_names[i].type == ATTR_NAME_TYPE_STR) {
                    char *val = av_strdup(value);
                    if (!val)
                        return AVERROR(ENOMEM);
                    *(char **)((char *)data+
                        attr_names[i].offset) = val;
                }
            }
        }
        if (!strcmp(attr, "bitrate")) {
            par->bit_rate = data->bitrate;
        }
    }
    return 0;
}

static int parse_sdp_line(AVFormatContext *s, int st_index,
                          PayloadContext *data, const char *line)
{
    const char *p;

    if (st_index < 0)
        return 0;

    if (av_strstart(line, "fmtp:", &p))
        return ff_parse_fmtp(s, s->streams[st_index], data, p, parse_fmtp);

    return 0;
}

const RTPDynamicProtocolHandler ff_mp4v_es_dynamic_handler = {
    .enc_name           = "MP4V-ES",
    .codec_type         = AVMEDIA_TYPE_VIDEO,
    .codec_id           = AV_CODEC_ID_MPEG4,
    .need_parsing       = AVSTREAM_PARSE_FULL,
    .priv_data_size     = sizeof(PayloadContext),
    .parse_sdp_a_line   = parse_sdp_line,
};

const RTPDynamicProtocolHandler ff_mpeg4_generic_dynamic_handler = {
    .enc_name           = "mpeg4-generic",
    .codec_type         = AVMEDIA_TYPE_AUDIO,
    .codec_id           = AV_CODEC_ID_AAC,
    .need_parsing       = AVSTREAM_PARSE_HEADERS,
    .priv_data_size     = sizeof(PayloadContext),
    .parse_sdp_a_line   = parse_sdp_line,
    .close              = close_context,
    .parse_packet       = aac_parse_packet,
};

Coverage Report

Created: 2026-01-16 07:48

Line	Count	Source
1		/*
2		* Common code for the RTP depacketization of MPEG-4 formats.
3		* Copyright (c) 2010 Fabrice Bellard
4		* Romain Degez
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		/**
24		* @file
25		* @brief MPEG-4 / RTP Code
26		* @author Fabrice Bellard
27		* @author Romain Degez
28		*/
29
30		#include "rtpdec_formats.h"
31		#include "internal.h"
32		#include "libavutil/attributes.h"
33		#include "libavutil/avstring.h"
34		#include "libavutil/mem.h"
35		#include "libavcodec/get_bits.h"
36
37	0	#define MAX_AAC_HBR_FRAME_SIZE 8191
38
39		/** Structure listing useful vars to parse RTP packet payload */
40		struct PayloadContext {
41		int bitrate;
42		int sizelength;
43		int indexlength;
44		int indexdeltalength;
45		int profile_level_id;
46		int streamtype;
47		int objecttype;
48		char *mode;
49
50		/** mpeg 4 AU headers */
51		struct AUHeaders {
52		int size;
53		int index;
54		int cts_flag;
55		int cts;
56		int dts_flag;
57		int dts;
58		int rap_flag;
59		int streamstate;
60		} *au_headers;
61		int au_headers_allocated;
62		int nb_au_headers;
63		int au_headers_length_bytes;
64		int cur_au_index;
65
66		uint8_t buf[FFMAX(RTP_MAX_PACKET_LENGTH, MAX_AAC_HBR_FRAME_SIZE)];
67		int buf_pos, buf_size;
68		uint32_t timestamp;
69		};
70
71		typedef struct AttrNameMap {
72		const char *str;
73		uint16_t type;
74		uint32_t offset;
75
76		/** Range for integer values */
77		struct Range {
78		int min;
79		int max;
80		} range;
81		} AttrNameMap;
82
83		/* All known fmtp parameters and the corresponding RTPAttrTypeEnum */
84	0	#define ATTR_NAME_TYPE_INT 0
85	0	#define ATTR_NAME_TYPE_STR 1
86		static const AttrNameMap attr_names[] = {
87		{ "bitrate", ATTR_NAME_TYPE_INT,
88		offsetof(PayloadContext, bitrate),
89		{0, INT32_MAX} },
90		{ "SizeLength", ATTR_NAME_TYPE_INT,
91		offsetof(PayloadContext, sizelength),
92		{0, 32} }, // SizeLength number of bits used to encode AU-size integer value
93		{ "IndexLength", ATTR_NAME_TYPE_INT,
94		offsetof(PayloadContext, indexlength),
95		{0, 32} }, // IndexLength number of bits used to encode AU-Index integer value
96		{ "IndexDeltaLength", ATTR_NAME_TYPE_INT,
97		offsetof(PayloadContext, indexdeltalength),
98		{0, 32} }, // IndexDeltaLength number of bits to encode AU-Index-delta integer value
99		{ "profile-level-id", ATTR_NAME_TYPE_INT,
100		offsetof(PayloadContext, profile_level_id),
101		{INT32_MIN, INT32_MAX} }, // It differs depending on StreamType
102		{ "StreamType", ATTR_NAME_TYPE_INT,
103		offsetof(PayloadContext, streamtype),
104		{0x00, 0x3F} }, // Values from ISO/IEC 14496-1, 'StreamType Values' table
105		{ "mode", ATTR_NAME_TYPE_STR,
106		offsetof(PayloadContext, mode),
107		{0} },
108		{ NULL, -1, -1, {0} },
109		};
110
111		static void close_context(PayloadContext *data)
112	0	{
113	0	av_freep(&data->au_headers);
114	0	av_freep(&data->mode);
115	0	}
116
117		static int parse_fmtp_config(AVCodecParameters par, const char value)
118	0	{
119		/* decode the hexa encoded parameter */
120	0	int len = ff_hex_to_data(NULL, value), ret;
121
122	0	if ((ret = ff_alloc_extradata(par, len)) < 0)
123	0	return ret;
124	0	ff_hex_to_data(par->extradata, value);
125	0	return 0;
126	0	}
127
128		static int rtp_parse_mp4_au(PayloadContext data, const uint8_t buf, int len)
129	0	{
130	0	int au_headers_length, au_header_size, i;
131	0	GetBitContext getbitcontext;
132	0	int ret;
133
134	0	if (len < 2)
135	0	return AVERROR_INVALIDDATA;
136
137		/* decode the first 2 bytes where the AUHeader sections are stored
138		length in bits */
139	0	au_headers_length = AV_RB16(buf);
140
141	0	if (au_headers_length > RTP_MAX_PACKET_LENGTH)
142	0	return -1;
143
144	0	data->au_headers_length_bytes = (au_headers_length + 7) / 8;
145
146		/* skip AU headers length section (2 bytes) */
147	0	buf += 2;
148	0	len -= 2;
149
150	0	if (len < data->au_headers_length_bytes)
151	0	return AVERROR_INVALIDDATA;
152
153	0	ret = init_get_bits(&getbitcontext, buf, data->au_headers_length_bytes * 8);
154	0	if (ret < 0)
155	0	return ret;
156
157		/* XXX: Wrong if optional additional sections are present (cts, dts etc...) */
158	0	au_header_size = data->sizelength + data->indexlength;
159	0	if (au_header_size <= 0 \|\| (au_headers_length % au_header_size != 0))
160	0	return -1;
161
162	0	data->nb_au_headers = au_headers_length / au_header_size;
163	0	if (!data->au_headers \|\| data->au_headers_allocated < data->nb_au_headers) {
164	0	av_free(data->au_headers);
165	0	data->au_headers = av_malloc(sizeof(struct AUHeaders) * data->nb_au_headers);
166	0	if (!data->au_headers)
167	0	return AVERROR(ENOMEM);
168	0	data->au_headers_allocated = data->nb_au_headers;
169	0	}
170
171	0	for (i = 0; i < data->nb_au_headers; ++i) {
172	0	data->au_headers[i].size = get_bits_long(&getbitcontext, data->sizelength);
173	0	data->au_headers[i].index = get_bits_long(&getbitcontext, data->indexlength);
174	0	}
175
176	0	return 0;
177	0	}
178
179
180		/* Follows RFC 3640 */
181		static int aac_parse_packet(AVFormatContext ctx, PayloadContext data,
182		AVStream st, AVPacket pkt, uint32_t *timestamp,
183		const uint8_t *buf, int len, uint16_t seq,
184		int flags)
185	0	{
186	0	int ret;
187
188
189	0	if (!buf) {
190	0	if (data->cur_au_index > data->nb_au_headers) {
191	0	av_log(ctx, AV_LOG_ERROR, "Invalid parser state\n");
192	0	return AVERROR_INVALIDDATA;
193	0	}
194	0	if (data->buf_size - data->buf_pos < data->au_headers[data->cur_au_index].size) {
195	0	av_log(ctx, AV_LOG_ERROR, "Invalid AU size\n");
196	0	return AVERROR_INVALIDDATA;
197	0	}
198	0	if ((ret = av_new_packet(pkt, data->au_headers[data->cur_au_index].size)) < 0) {
199	0	av_log(ctx, AV_LOG_ERROR, "Out of memory\n");
200	0	return ret;
201	0	}
202	0	memcpy(pkt->data, &data->buf[data->buf_pos], data->au_headers[data->cur_au_index].size);
203	0	data->buf_pos += data->au_headers[data->cur_au_index].size;
204	0	pkt->stream_index = st->index;
205	0	data->cur_au_index++;
206
207	0	if (data->cur_au_index == data->nb_au_headers) {
208	0	data->buf_pos = 0;
209	0	return 0;
210	0	}
211
212	0	return 1;
213	0	}
214
215	0	if (rtp_parse_mp4_au(data, buf, len)) {
216	0	av_log(ctx, AV_LOG_ERROR, "Error parsing AU headers\n");
217	0	return -1;
218	0	}
219
220	0	buf += data->au_headers_length_bytes + 2;
221	0	len -= data->au_headers_length_bytes + 2;
222	0	if (data->nb_au_headers == 1 && len < data->au_headers[0].size) {
223		/* Packet is fragmented */
224
225	0	if (!data->buf_pos) {
226	0	if (data->au_headers[0].size > MAX_AAC_HBR_FRAME_SIZE) {
227	0	av_log(ctx, AV_LOG_ERROR, "Invalid AU size\n");
228	0	return AVERROR_INVALIDDATA;
229	0	}
230
231	0	data->buf_size = data->au_headers[0].size;
232	0	data->timestamp = *timestamp;
233	0	}
234
235	0	if (data->timestamp != *timestamp \|\|
236	0	data->au_headers[0].size != data->buf_size \|\|
237	0	data->buf_pos + len > MAX_AAC_HBR_FRAME_SIZE) {
238	0	data->buf_pos = 0;
239	0	data->buf_size = 0;
240	0	av_log(ctx, AV_LOG_ERROR, "Invalid packet received\n");
241	0	return AVERROR_INVALIDDATA;
242	0	}
243
244	0	memcpy(&data->buf[data->buf_pos], buf, len);
245	0	data->buf_pos += len;
246
247	0	if (!(flags & RTP_FLAG_MARKER))
248	0	return AVERROR(EAGAIN);
249
250	0	if (data->buf_pos != data->buf_size) {
251	0	data->buf_pos = 0;
252	0	av_log(ctx, AV_LOG_ERROR, "Missed some packets, discarding frame\n");
253	0	return AVERROR_INVALIDDATA;
254	0	}
255
256	0	data->buf_pos = 0;
257	0	ret = av_new_packet(pkt, data->buf_size);
258	0	if (ret < 0) {
259	0	av_log(ctx, AV_LOG_ERROR, "Out of memory\n");
260	0	return ret;
261	0	}
262	0	pkt->stream_index = st->index;
263
264	0	memcpy(pkt->data, data->buf, data->buf_size);
265
266	0	return 0;
267	0	}
268
269	0	if (len < data->au_headers[0].size) {
270	0	av_log(ctx, AV_LOG_ERROR, "First AU larger than packet size\n");
271	0	return AVERROR_INVALIDDATA;
272	0	}
273	0	if ((ret = av_new_packet(pkt, data->au_headers[0].size)) < 0) {
274	0	av_log(ctx, AV_LOG_ERROR, "Out of memory\n");
275	0	return ret;
276	0	}
277	0	memcpy(pkt->data, buf, data->au_headers[0].size);
278	0	len -= data->au_headers[0].size;
279	0	buf += data->au_headers[0].size;
280	0	pkt->stream_index = st->index;
281
282	0	if (len > 0 && data->nb_au_headers > 1) {
283	0	data->buf_size = FFMIN(len, sizeof(data->buf));
284	0	memcpy(data->buf, buf, data->buf_size);
285	0	data->cur_au_index = 1;
286	0	data->buf_pos = 0;
287	0	return 1;
288	0	}
289
290	0	return 0;
291	0	}
292
293		static int parse_fmtp(AVFormatContext *s,
294		AVStream stream, PayloadContext data,
295		const char attr, const char value)
296	0	{
297	0	AVCodecParameters *par = stream->codecpar;
298	0	int res, i;
299
300	0	if (!strcmp(attr, "config")) {
301	0	res = parse_fmtp_config(par, value);
302
303	0	if (res < 0)
304	0	return res;
305	0	}
306
307	0	if (par->codec_id == AV_CODEC_ID_AAC) {
308		/* Looking for a known attribute */
309	0	for (i = 0; attr_names[i].str; ++i) {
310	0	if (!av_strcasecmp(attr, attr_names[i].str)) {
311	0	if (attr_names[i].type == ATTR_NAME_TYPE_INT) {
312	0	char *end_ptr = NULL;
313	0	long long int val = strtoll(value, &end_ptr, 10);
314	0	if (end_ptr == value \|\| end_ptr[0] != '\0') {
315	0	av_log(s, AV_LOG_ERROR,
316	0	"The %s field value is not a valid number: %s\n",
317	0	attr, value);
318	0	return AVERROR_INVALIDDATA;
319	0	}
320	0	if (val < attr_names[i].range.min \|\|
321	0	val > attr_names[i].range.max) {
322	0	av_log(s, AV_LOG_ERROR,
323	0	"fmtp field %s should be in range [%d,%d] (provided value: %lld)",
324	0	attr, attr_names[i].range.min, attr_names[i].range.max, val);
325	0	return AVERROR_INVALIDDATA;
326	0	}
327
328	0	(int )((char *)data+
329	0	attr_names[i].offset) = (int) val;
330	0	} else if (attr_names[i].type == ATTR_NAME_TYPE_STR) {
331	0	char *val = av_strdup(value);
332	0	if (!val)
333	0	return AVERROR(ENOMEM);
334	0	(char )((char )data+
335	0	attr_names[i].offset) = val;
336	0	}
337	0	}
338	0	}
339	0	if (!strcmp(attr, "bitrate")) {
340	0	par->bit_rate = data->bitrate;
341	0	}
342	0	}
343	0	return 0;
344	0	}
345
346		static int parse_sdp_line(AVFormatContext *s, int st_index,
347		PayloadContext data, const char line)
348	0	{
349	0	const char *p;
350
351	0	if (st_index < 0)
352	0	return 0;
353
354	0	if (av_strstart(line, "fmtp:", &p))
355	0	return ff_parse_fmtp(s, s->streams[st_index], data, p, parse_fmtp);
356
357	0	return 0;
358	0	}
359
360		const RTPDynamicProtocolHandler ff_mp4v_es_dynamic_handler = {
361		.enc_name = "MP4V-ES",
362		.codec_type = AVMEDIA_TYPE_VIDEO,
363		.codec_id = AV_CODEC_ID_MPEG4,
364		.need_parsing = AVSTREAM_PARSE_FULL,
365		.priv_data_size = sizeof(PayloadContext),
366		.parse_sdp_a_line = parse_sdp_line,
367		};
368
369		const RTPDynamicProtocolHandler ff_mpeg4_generic_dynamic_handler = {
370		.enc_name = "mpeg4-generic",
371		.codec_type = AVMEDIA_TYPE_AUDIO,
372		.codec_id = AV_CODEC_ID_AAC,
373		.need_parsing = AVSTREAM_PARSE_HEADERS,
374		.priv_data_size = sizeof(PayloadContext),
375		.parse_sdp_a_line = parse_sdp_line,
376		.close = close_context,
377		.parse_packet = aac_parse_packet,
378		};