/* * copyright (c) 2007 Luca Abeni * * 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 "libavutil/avstring.h"#include "libavutil/base64.h"#include "avformat.h"#include "avc.h"#include "rtp.h"#ifdef CONFIG_RTP_MUXER#define MAX_EXTRADATA_SIZE ((INT_MAX - 10) / 2)struct sdp_session_level {    int sdp_version;      /**< protocol version (currently 0) */    int id;               /**< session id */    int version;          /**< session version */    int start_time;       /**< session start time (NTP time, in seconds),                             or 0 in case of permanent session */    int end_time;         /**< session end time (NTP time, in seconds),                               or 0 if the session is not bounded */    int ttl;              /**< TTL, in case of multicast stream */    const char *user;     /**< username of the session's creator */    const char *src_addr; /**< IP address of the machine from which the session was created */    const char *dst_addr; /**< destination IP address (can be multicast) */    const char *name;     /**< session name (can be an empty string) */};static void dest_write(char *buff, int size, const char *dest_addr, int ttl){    if (dest_addr) {        if (ttl > 0) {            av_strlcatf(buff, size, "c=IN IP4 %s/%d\r\n", dest_addr, ttl);        } else {            av_strlcatf(buff, size, "c=IN IP4 %s\r\n", dest_addr);        }    }}static void sdp_write_header(char *buff, int size, struct sdp_session_level *s){    av_strlcatf(buff, size, "v=%d\r\n"                            "o=- %d %d IN IPV4 %s\r\n"                            "t=%d %d\r\n"                            "s=%s\r\n"                            "a=tool:libavformat " AV_STRINGIFY(LIBAVFORMAT_VERSION) "\r\n",                            s->sdp_version,                            s->id, s->version, s->src_addr,                            s->start_time, s->end_time,                            s->name[0] ? s->name : "No Name");    dest_write(buff, size, s->dst_addr, s->ttl);}static int get_address(char *dest_addr, int size, int *ttl, const char *url){    int port;    const char *p;    url_split(NULL, 0, NULL, 0, dest_addr, size, &port, NULL, 0, url);    *ttl = 0;    p = strchr(url, '?');    if (p) {        char buff[64];        int is_multicast = find_info_tag(buff, sizeof(buff), "multicast", p);        if (is_multicast) {            if (find_info_tag(buff, sizeof(buff), "ttl", p)) {                *ttl = strtol(buff, NULL, 10);            } else {                *ttl = 5;            }        }    }    return port;}#define MAX_PSET_SIZE 1024static char *extradata2psets(AVCodecContext *c){    char *psets, *p;    const uint8_t *r;    const char *pset_string = "; sprop-parameter-sets=";    if (c->extradata_size > MAX_EXTRADATA_SIZE) {        av_log(c, AV_LOG_ERROR, "Too many extra data!\n");        return NULL;    }    psets = av_mallocz(MAX_PSET_SIZE);    if (psets == NULL) {        av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the parameter sets\n");        return NULL;    }    memcpy(psets, pset_string, strlen(pset_string));    p = psets + strlen(pset_string);    r = ff_avc_find_startcode(c->extradata, c->extradata + c->extradata_size);    while (r < c->extradata + c->extradata_size) {        const uint8_t *r1;        while (!*(r++));        r1 = ff_avc_find_startcode(r, c->extradata + c->extradata_size);        if (p != (psets + strlen(pset_string))) {            *p = ',';            p++;        }        if (av_base64_encode(p, MAX_PSET_SIZE - (p - psets), r, r1 - r) == NULL) {            av_log(c, AV_LOG_ERROR, "Cannot BASE64 encode %td %td!\n", MAX_PSET_SIZE - (p - psets), r1 - r);            av_free(psets);            return NULL;        }        p += strlen(p);        r = r1;    }    return psets;}static void digit_to_char(char *dst, uint8_t src){    if (src < 10) {        *dst = '0' + src;    } else {        *dst = 'A' + src - 10;    }}static char *data_to_hex(char *buff, const uint8_t *src, int s){    int i;    for(i = 0; i < s; i++) {        digit_to_char(buff + 2 * i, src[i] >> 4);        digit_to_char(buff + 2 * i + 1, src[i] & 0xF);    }    return buff;}static char *extradata2config(AVCodecContext *c){    char *config;    if (c->extradata_size > MAX_EXTRADATA_SIZE) {        av_log(c, AV_LOG_ERROR, "Too many extra data!\n");        return NULL;    }    config = av_malloc(10 + c->extradata_size * 2);    if (config == NULL) {        av_log(c, AV_LOG_ERROR, "Cannot allocate memory for the config info\n");        return NULL;    }    memcpy(config, "; config=", 9);    data_to_hex(config + 9, c->extradata, c->extradata_size);    config[9 + c->extradata_size * 2] = 0;    return config;}static char *sdp_media_attributes(char *buff, int size, AVCodecContext *c, int payload_type){    char *config = NULL;    switch (c->codec_id) {        case CODEC_ID_H264:            if (c->extradata_size) {                config = extradata2psets(c);            }            av_strlcatf(buff, size, "a=rtpmap:%d H264/90000\r\n"                                    "a=fmtp:%d packetization-mode=1%s\r\n",                                     payload_type,                                     payload_type, config ? config : "");            break;        case CODEC_ID_MPEG4:            if (c->extradata_size) {                config = extradata2config(c);            }            av_strlcatf(buff, size, "a=rtpmap:%d MP4V-ES/90000\r\n"                                    "a=fmtp:%d profile-level-id=1%s\r\n",                                     payload_type,                                     payload_type, config ? config : "");            break;        case CODEC_ID_AAC:            if (c->extradata_size) {                config = extradata2config(c);            } else {                /* FIXME: maybe we can forge config information based on the                 *        codec parameters...                 */                av_log(c, AV_LOG_ERROR, "AAC with no global headers is currently not supported\n");                return NULL;            }            if (config == NULL) {                return NULL;            }            av_strlcatf(buff, size, "a=rtpmap:%d MPEG4-GENERIC/%d/%d\r\n"                                    "a=fmtp:%d profile-level-id=1;"                                    "mode=AAC-hbr;sizelength=13;indexlength=3;"                                    "indexdeltalength=3%s\r\n",                                     payload_type, c->sample_rate, c->channels,                                     payload_type, config);            break;        case CODEC_ID_PCM_S16BE:            if (payload_type >= 96)                av_strlcatf(buff, size, "a=rtpmap:%d L16/%d/%d\r\n",                                         payload_type,                                         c->sample_rate, c->channels);            break;        case CODEC_ID_PCM_MULAW:            if (payload_type >= 96)                av_strlcatf(buff, size, "a=rtpmap:%d PCMU/%d/%d\r\n",                                         payload_type,                                         c->sample_rate, c->channels);            break;        case CODEC_ID_PCM_ALAW:            if (payload_type >= 96)                av_strlcatf(buff, size, "a=rtpmap:%d PCMA/%d/%d\r\n",                                         payload_type,                                         c->sample_rate, c->channels);            break;        default:            /* Nothing special to do, here... */            break;    }    av_free(config);    return buff;}static void sdp_write_media(char *buff, int size, AVCodecContext *c, const char *dest_addr, int port, int ttl){    const char *type;    int payload_type;    payload_type = rtp_get_payload_type(c);    if (payload_type < 0) {        payload_type = 96;  /* FIXME: how to assign a private pt? rtp.c is broken too */    }    switch (c->codec_type) {        case CODEC_TYPE_VIDEO   : type = "video"      ; break;        case CODEC_TYPE_AUDIO   : type = "audio"      ; break;        case CODEC_TYPE_SUBTITLE: type = "text"       ; break;        default                 : type = "application"; break;    }    av_strlcatf(buff, size, "m=%s %d RTP/AVP %d\r\n", type, port, payload_type);    dest_write(buff, size, dest_addr, ttl);    if (c->bit_rate) {        av_strlcatf(buff, size, "b=AS:%d\r\n", c->bit_rate / 1000);    }    sdp_media_attributes(buff, size, c, payload_type);}int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size){    struct sdp_session_level s;    int i, j, port, ttl;    char dst[32];    memset(buff, 0, size);    memset(&s, 0, sizeof(struct sdp_session_level));    s.user = "-";    s.src_addr = "127.0.0.1";    /* FIXME: Properly set this */    s.name = ac[0]->title;    port = 0;    ttl = 0;    if (n_files == 1) {        port = get_address(dst, sizeof(dst), &ttl, ac[0]->filename);        if (port > 0) {            s.dst_addr = dst;            s.ttl = ttl;        }    }    sdp_write_header(buff, size, &s);    dst[0] = 0;    for (i = 0; i < n_files; i++) {        if (n_files != 1) {            port = get_address(dst, sizeof(dst), &ttl, ac[i]->filename);        }        for (j = 0; j < ac[i]->nb_streams; j++) {            sdp_write_media(buff, size,                                  ac[i]->streams[j]->codec, dst[0] ? dst : NULL,                                  (port > 0) ? port + j * 2 : 0, ttl);            if (port <= 0) {                av_strlcatf(buff, size,                                   "a=control:streamid=%d\r\n", i + j);            }        }    }    return 0;}#elseint avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size){    return AVERROR(ENOSYS);}#endif