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FFmpeg/libavformat/rtmpproto.c
Kostya Shishkov 2784ede40a Remove duplicating variable 
Originally committed as revision 20718 to svn://svn.ffmpeg.org/ffmpeg/trunk
2009-12-03 17:11:48 +00:00

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/*
* RTMP network protocol
* Copyright (c) 2009 Kostya Shishkov
*
* 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/rtmpproto.c
* RTMP protocol
*/
#include "libavcodec/bytestream.h"
#include "libavutil/avstring.h"
#include "libavutil/lfg.h"
#include "libavutil/sha.h"
#include "avformat.h"
#include "network.h"
#include "flv.h"
#include "rtmp.h"
#include "rtmppkt.h"
/* we can't use av_log() with URLContext yet... */
#if LIBAVFORMAT_VERSION_MAJOR < 53
#define LOG_CONTEXT NULL
#else
#define LOG_CONTEXT s
#endif
/** RTMP protocol handler state */
typedef enum {
STATE_START, ///< client has not done anything yet
STATE_HANDSHAKED, ///< client has performed handshake
STATE_CONNECTING, ///< client connected to server successfully
STATE_READY, ///< client has sent all needed commands and waits for server reply
STATE_PLAYING, ///< client has started receiving multimedia data from server
} ClientState;
/** protocol handler context */
typedef struct RTMPContext {
URLContext* stream; ///< TCP stream used in interactions with RTMP server
RTMPPacket prev_pkt[2][RTMP_CHANNELS]; ///< packet history used when reading and sending packets
int chunk_size; ///< size of the chunks RTMP packets are divided into
int is_input; ///< input/output flag
char playpath[256]; ///< path to filename to play (with possible "mp4:" prefix)
char app[128]; ///< application
ClientState state; ///< current state
int main_channel_id; ///< an additional channel ID which is used for some invocations
uint8_t* flv_data; ///< buffer with data for demuxer
int flv_size; ///< current buffer size
int flv_off; ///< number of bytes read from current buffer
} RTMPContext;
#define PLAYER_KEY_OPEN_PART_LEN 30 ///< length of partial key used for first client digest signing
/** Client key used for digest signing */
static const uint8_t rtmp_player_key[] = {
'G', 'e', 'n', 'u', 'i', 'n', 'e', ' ', 'A', 'd', 'o', 'b', 'e', ' ',
'F', 'l', 'a', 's', 'h', ' ', 'P', 'l', 'a', 'y', 'e', 'r', ' ', '0', '0', '1',
0xF0, 0xEE, 0xC2, 0x4A, 0x80, 0x68, 0xBE, 0xE8, 0x2E, 0x00, 0xD0, 0xD1, 0x02,
0x9E, 0x7E, 0x57, 0x6E, 0xEC, 0x5D, 0x2D, 0x29, 0x80, 0x6F, 0xAB, 0x93, 0xB8,
0xE6, 0x36, 0xCF, 0xEB, 0x31, 0xAE
};
#define SERVER_KEY_OPEN_PART_LEN 36 ///< length of partial key used for first server digest signing
/** Key used for RTMP server digest signing */
static const uint8_t rtmp_server_key[] = {
'G', 'e', 'n', 'u', 'i', 'n', 'e', ' ', 'A', 'd', 'o', 'b', 'e', ' ',
'F', 'l', 'a', 's', 'h', ' ', 'M', 'e', 'd', 'i', 'a', ' ',
'S', 'e', 'r', 'v', 'e', 'r', ' ', '0', '0', '1',
0xF0, 0xEE, 0xC2, 0x4A, 0x80, 0x68, 0xBE, 0xE8, 0x2E, 0x00, 0xD0, 0xD1, 0x02,
0x9E, 0x7E, 0x57, 0x6E, 0xEC, 0x5D, 0x2D, 0x29, 0x80, 0x6F, 0xAB, 0x93, 0xB8,
0xE6, 0x36, 0xCF, 0xEB, 0x31, 0xAE
};
/**
* Generates 'connect' call and sends it to the server.
*/
static void gen_connect(URLContext *s, RTMPContext *rt, const char *proto,
const char *host, int port)
{
RTMPPacket pkt;
uint8_t ver[32], *p;
char tcurl[512];
ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0, 4096);
p = pkt.data;
snprintf(tcurl, sizeof(tcurl), "%s://%s:%d/%s", proto, host, port, rt->app);
ff_amf_write_string(&p, "connect");
ff_amf_write_number(&p, 1.0);
ff_amf_write_object_start(&p);
ff_amf_write_field_name(&p, "app");
ff_amf_write_string(&p, rt->app);
snprintf(ver, sizeof(ver), "%s %d,%d,%d,%d", RTMP_CLIENT_PLATFORM, RTMP_CLIENT_VER1,
RTMP_CLIENT_VER2, RTMP_CLIENT_VER3, RTMP_CLIENT_VER4);
ff_amf_write_field_name(&p, "flashVer");
ff_amf_write_string(&p, ver);
ff_amf_write_field_name(&p, "tcUrl");
ff_amf_write_string(&p, tcurl);
ff_amf_write_field_name(&p, "fpad");
ff_amf_write_bool(&p, 0);
ff_amf_write_field_name(&p, "capabilities");
ff_amf_write_number(&p, 15.0);
ff_amf_write_field_name(&p, "audioCodecs");
ff_amf_write_number(&p, 1639.0);
ff_amf_write_field_name(&p, "videoCodecs");
ff_amf_write_number(&p, 252.0);
ff_amf_write_field_name(&p, "videoFunction");
ff_amf_write_number(&p, 1.0);
ff_amf_write_object_end(&p);
pkt.data_size = p - pkt.data;
ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
}
/**
* Generates 'createStream' call and sends it to the server. It should make
* the server allocate some channel for media streams.
*/
static void gen_create_stream(URLContext *s, RTMPContext *rt)
{
RTMPPacket pkt;
uint8_t *p;
av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Creating stream...\n");
ff_rtmp_packet_create(&pkt, RTMP_SYSTEM_CHANNEL, RTMP_PT_INVOKE, 0, 25);
p = pkt.data;
ff_amf_write_string(&p, "createStream");
ff_amf_write_number(&p, 3.0);
ff_amf_write_null(&p);
ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
ff_rtmp_packet_destroy(&pkt);
}
/**
* Generates 'play' call and sends it to the server, then pings the server
* to start actual playing.
*/
static void gen_play(URLContext *s, RTMPContext *rt)
{
RTMPPacket pkt;
uint8_t *p;
av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Sending play command for '%s'\n", rt->playpath);
ff_rtmp_packet_create(&pkt, RTMP_VIDEO_CHANNEL, RTMP_PT_INVOKE, 0,
20 + strlen(rt->playpath));
pkt.extra = rt->main_channel_id;
p = pkt.data;
ff_amf_write_string(&p, "play");
ff_amf_write_number(&p, 0.0);
ff_amf_write_null(&p);
ff_amf_write_string(&p, rt->playpath);
ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
ff_rtmp_packet_destroy(&pkt);
// set client buffer time disguised in ping packet
ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_PING, 1, 10);
p = pkt.data;
bytestream_put_be16(&p, 3);
bytestream_put_be32(&p, 1);
bytestream_put_be32(&p, 256); //TODO: what is a good value here?
ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
ff_rtmp_packet_destroy(&pkt);
}
/**
* Generates ping reply and sends it to the server.
*/
static void gen_pong(URLContext *s, RTMPContext *rt, RTMPPacket *ppkt)
{
RTMPPacket pkt;
uint8_t *p;
ff_rtmp_packet_create(&pkt, RTMP_NETWORK_CHANNEL, RTMP_PT_PING, ppkt->timestamp + 1, 6);
p = pkt.data;
bytestream_put_be16(&p, 7);
bytestream_put_be32(&p, AV_RB32(ppkt->data+2) + 1);
ff_rtmp_packet_write(rt->stream, &pkt, rt->chunk_size, rt->prev_pkt[1]);
ff_rtmp_packet_destroy(&pkt);
}
//TODO: Move HMAC code somewhere. Eventually.
#define HMAC_IPAD_VAL 0x36
#define HMAC_OPAD_VAL 0x5C
/**
* Calculates HMAC-SHA2 digest for RTMP handshake packets.
*
* @param src input buffer
* @param len input buffer length (should be 1536)
* @param gap offset in buffer where 32 bytes should not be taken into account
* when calculating digest (since it will be used to store that digest)
* @param key digest key
* @param keylen digest key length
* @param dst buffer where calculated digest will be stored (32 bytes)
*/
static void rtmp_calc_digest(const uint8_t *src, int len, int gap,
const uint8_t *key, int keylen, uint8_t *dst)
{
struct AVSHA *sha;
uint8_t hmac_buf[64+32] = {0};
int i;
sha = av_mallocz(av_sha_size);
if (keylen < 64) {
memcpy(hmac_buf, key, keylen);
} else {
av_sha_init(sha, 256);
av_sha_update(sha,key, keylen);
av_sha_final(sha, hmac_buf);
}
for (i = 0; i < 64; i++)
hmac_buf[i] ^= HMAC_IPAD_VAL;
av_sha_init(sha, 256);
av_sha_update(sha, hmac_buf, 64);
if (gap <= 0) {
av_sha_update(sha, src, len);
} else { //skip 32 bytes used for storing digest
av_sha_update(sha, src, gap);
av_sha_update(sha, src + gap + 32, len - gap - 32);
}
av_sha_final(sha, hmac_buf + 64);
for (i = 0; i < 64; i++)
hmac_buf[i] ^= HMAC_IPAD_VAL ^ HMAC_OPAD_VAL; //reuse XORed key for opad
av_sha_init(sha, 256);
av_sha_update(sha, hmac_buf, 64+32);
av_sha_final(sha, dst);
av_free(sha);
}
/**
* Puts HMAC-SHA2 digest of packet data (except for the bytes where this digest
* will be stored) into that packet.
*
* @param buf handshake data (1536 bytes)
* @return offset to the digest inside input data
*/
static int rtmp_handshake_imprint_with_digest(uint8_t *buf)
{
int i, digest_pos = 0;
for (i = 8; i < 12; i++)
digest_pos += buf[i];
digest_pos = (digest_pos % 728) + 12;
rtmp_calc_digest(buf, RTMP_HANDSHAKE_PACKET_SIZE, digest_pos,
rtmp_player_key, PLAYER_KEY_OPEN_PART_LEN,
buf + digest_pos);
return digest_pos;
}
/**
* Verifies that the received server response has the expected digest value.
*
* @param buf handshake data received from the server (1536 bytes)
* @param off position to search digest offset from
* @return 0 if digest is valid, digest position otherwise
*/
static int rtmp_validate_digest(uint8_t *buf, int off)
{
int i, digest_pos = 0;
uint8_t digest[32];
for (i = 0; i < 4; i++)
digest_pos += buf[i + off];
digest_pos = (digest_pos % 728) + off + 4;
rtmp_calc_digest(buf, RTMP_HANDSHAKE_PACKET_SIZE, digest_pos,
rtmp_server_key, SERVER_KEY_OPEN_PART_LEN,
digest);
if (!memcmp(digest, buf + digest_pos, 32))
return digest_pos;
return 0;
}
/**
* Performs handshake with the server by means of exchanging pseudorandom data
* signed with HMAC-SHA2 digest.
*
* @return 0 if handshake succeeds, negative value otherwise
*/
static int rtmp_handshake(URLContext *s, RTMPContext *rt)
{
AVLFG rnd;
uint8_t tosend [RTMP_HANDSHAKE_PACKET_SIZE+1] = {
3, // unencrypted data
0, 0, 0, 0, // client uptime
RTMP_CLIENT_VER1,
RTMP_CLIENT_VER2,
RTMP_CLIENT_VER3,
RTMP_CLIENT_VER4,
};
uint8_t clientdata[RTMP_HANDSHAKE_PACKET_SIZE];
uint8_t serverdata[RTMP_HANDSHAKE_PACKET_SIZE+1];
int i;
int server_pos, client_pos;
uint8_t digest[32];
av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Handshaking...\n");
av_lfg_init(&rnd, 0xDEADC0DE);
// generate handshake packet - 1536 bytes of pseudorandom data
for (i = 9; i <= RTMP_HANDSHAKE_PACKET_SIZE; i++)
tosend[i] = av_lfg_get(&rnd) >> 24;
client_pos = rtmp_handshake_imprint_with_digest(tosend + 1);
url_write(rt->stream, tosend, RTMP_HANDSHAKE_PACKET_SIZE + 1);
i = url_read_complete(rt->stream, serverdata, RTMP_HANDSHAKE_PACKET_SIZE + 1);
if (i != RTMP_HANDSHAKE_PACKET_SIZE + 1) {
av_log(LOG_CONTEXT, AV_LOG_ERROR, "Cannot read RTMP handshake response\n");
return -1;
}
i = url_read_complete(rt->stream, clientdata, RTMP_HANDSHAKE_PACKET_SIZE);
if (i != RTMP_HANDSHAKE_PACKET_SIZE) {
av_log(LOG_CONTEXT, AV_LOG_ERROR, "Cannot read RTMP handshake response\n");
return -1;
}
av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Server version %d.%d.%d.%d\n",
serverdata[5], serverdata[6], serverdata[7], serverdata[8]);
server_pos = rtmp_validate_digest(serverdata + 1, 772);
if (!server_pos) {
server_pos = rtmp_validate_digest(serverdata + 1, 8);
if (!server_pos) {
av_log(LOG_CONTEXT, AV_LOG_ERROR, "Server response validating failed\n");
return -1;
}
}
rtmp_calc_digest(tosend + 1 + client_pos, 32, 0,
rtmp_server_key, sizeof(rtmp_server_key),
digest);
rtmp_calc_digest(clientdata, RTMP_HANDSHAKE_PACKET_SIZE-32, 0,
digest, 32,
digest);
if (memcmp(digest, clientdata + RTMP_HANDSHAKE_PACKET_SIZE - 32, 32)) {
av_log(LOG_CONTEXT, AV_LOG_ERROR, "Signature mismatch\n");
return -1;
}
for (i = 0; i < RTMP_HANDSHAKE_PACKET_SIZE; i++)
tosend[i] = av_lfg_get(&rnd) >> 24;
rtmp_calc_digest(serverdata + 1 + server_pos, 32, 0,
rtmp_player_key, sizeof(rtmp_player_key),
digest);
rtmp_calc_digest(tosend, RTMP_HANDSHAKE_PACKET_SIZE - 32, 0,
digest, 32,
tosend + RTMP_HANDSHAKE_PACKET_SIZE - 32);
// write reply back to the server
url_write(rt->stream, tosend, RTMP_HANDSHAKE_PACKET_SIZE);
return 0;
}
/**
* Parses received packet and may perform some action depending on
* the packet contents.
* @return 0 for no errors, negative values for serious errors which prevent
* further communications, positive values for uncritical errors
*/
static int rtmp_parse_result(URLContext *s, RTMPContext *rt, RTMPPacket *pkt)
{
int i, t;
const uint8_t *data_end = pkt->data + pkt->data_size;
switch (pkt->type) {
case RTMP_PT_CHUNK_SIZE:
if (pkt->data_size != 4) {
av_log(LOG_CONTEXT, AV_LOG_ERROR,
"Chunk size change packet is not 4 bytes long (%d)\n", pkt->data_size);
return -1;
}
rt->chunk_size = AV_RB32(pkt->data);
if (rt->chunk_size <= 0) {
av_log(LOG_CONTEXT, AV_LOG_ERROR, "Incorrect chunk size %d\n", rt->chunk_size);
return -1;
}
av_log(LOG_CONTEXT, AV_LOG_DEBUG, "New chunk size = %d\n", rt->chunk_size);
break;
case RTMP_PT_PING:
t = AV_RB16(pkt->data);
if (t == 6)
gen_pong(s, rt, pkt);
break;
case RTMP_PT_INVOKE:
//TODO: check for the messages sent for wrong state?
if (!memcmp(pkt->data, "\002\000\006_error", 9)) {
uint8_t tmpstr[256];
if (!ff_amf_get_field_value(pkt->data + 9, data_end,
"description", tmpstr, sizeof(tmpstr)))
av_log(LOG_CONTEXT, AV_LOG_ERROR, "Server error: %s\n",tmpstr);
return -1;
} else if (!memcmp(pkt->data, "\002\000\007_result", 10)) {
switch (rt->state) {
case STATE_HANDSHAKED:
gen_create_stream(s, rt);
rt->state = STATE_CONNECTING;
break;
case STATE_CONNECTING:
//extract a number from the result
if (pkt->data[10] || pkt->data[19] != 5 || pkt->data[20]) {
av_log(LOG_CONTEXT, AV_LOG_WARNING, "Unexpected reply on connect()\n");
} else {
rt->main_channel_id = (int) av_int2dbl(AV_RB64(pkt->data + 21));
}
gen_play(s, rt);
rt->state = STATE_READY;
break;
}
} else if (!memcmp(pkt->data, "\002\000\010onStatus", 11)) {
const uint8_t* ptr = pkt->data + 11;
uint8_t tmpstr[256];
for (i = 0; i < 2; i++) {
t = ff_amf_tag_size(ptr, data_end);
if (t < 0)
return 1;
ptr += t;
}
t = ff_amf_get_field_value(ptr, data_end,
"level", tmpstr, sizeof(tmpstr));
if (!t && !strcmp(tmpstr, "error")) {
if (!ff_amf_get_field_value(ptr, data_end,
"description", tmpstr, sizeof(tmpstr)))
av_log(LOG_CONTEXT, AV_LOG_ERROR, "Server error: %s\n",tmpstr);
return -1;
}
t = ff_amf_get_field_value(ptr, data_end,
"code", tmpstr, sizeof(tmpstr));
if (!t && !strcmp(tmpstr, "NetStream.Play.Start")) {
rt->state = STATE_PLAYING;
return 0;
}
}
break;
}
return 0;
}
/**
* Interacts with the server by receiving and sending RTMP packets until
* there is some significant data (media data or expected status notification).
*
* @param s reading context
* @param for_header non-zero value tells function to work until it
* gets notification from the server that playing has been started,
* otherwise function will work until some media data is received (or
* an error happens)
* @return 0 for successful operation, negative value in case of error
*/
static int get_packet(URLContext *s, int for_header)
{
RTMPContext *rt = s->priv_data;
int ret;
for(;;) {
RTMPPacket rpkt;
if ((ret = ff_rtmp_packet_read(rt->stream, &rpkt,
rt->chunk_size, rt->prev_pkt[0])) != 0) {
if (ret > 0) {
return AVERROR(EAGAIN);
} else {
return AVERROR(EIO);
}
}
ret = rtmp_parse_result(s, rt, &rpkt);
if (ret < 0) {//serious error in current packet
ff_rtmp_packet_destroy(&rpkt);
return -1;
}
if (for_header && rt->state == STATE_PLAYING) {
ff_rtmp_packet_destroy(&rpkt);
return 0;
}
if (!rpkt.data_size) {
ff_rtmp_packet_destroy(&rpkt);
continue;
}
if (rpkt.type == RTMP_PT_VIDEO || rpkt.type == RTMP_PT_AUDIO ||
(rpkt.type == RTMP_PT_NOTIFY && !memcmp("\002\000\012onMetaData", rpkt.data, 13))) {
uint8_t *p;
uint32_t ts = rpkt.timestamp;
// generate packet header and put data into buffer for FLV demuxer
rt->flv_off = 0;
rt->flv_size = rpkt.data_size + 15;
rt->flv_data = p = av_realloc(rt->flv_data, rt->flv_size);
bytestream_put_byte(&p, rpkt.type);
bytestream_put_be24(&p, rpkt.data_size);
bytestream_put_be24(&p, ts);
bytestream_put_byte(&p, ts >> 24);
bytestream_put_be24(&p, 0);
bytestream_put_buffer(&p, rpkt.data, rpkt.data_size);
bytestream_put_be32(&p, 0);
ff_rtmp_packet_destroy(&rpkt);
return 0;
} else if (rpkt.type == RTMP_PT_METADATA) {
// we got raw FLV data, make it available for FLV demuxer
rt->flv_off = 0;
rt->flv_size = rpkt.data_size;
rt->flv_data = av_realloc(rt->flv_data, rt->flv_size);
memcpy(rt->flv_data, rpkt.data, rpkt.data_size);
ff_rtmp_packet_destroy(&rpkt);
return 0;
}
ff_rtmp_packet_destroy(&rpkt);
}
return 0;
}
static int rtmp_close(URLContext *h)
{
RTMPContext *rt = h->priv_data;
av_freep(&rt->flv_data);
url_close(rt->stream);
av_free(rt);
return 0;
}
/**
* Opens RTMP connection and verifies that the stream can be played.
*
* URL syntax: rtmp://server[:port][/app][/playpath]
* where 'app' is first one or two directories in the path
* (e.g. /ondemand/, /flash/live/, etc.)
* and 'playpath' is a file name (the rest of the path,
* may be prefixed with "mp4:")
*/
static int rtmp_open(URLContext *s, const char *uri, int flags)
{
RTMPContext *rt;
char proto[8], hostname[256], path[1024], *fname;
uint8_t buf[2048];
int port;
int ret;
rt = av_mallocz(sizeof(RTMPContext));
if (!rt)
return AVERROR(ENOMEM);
s->priv_data = rt;
rt->is_input = !(flags & URL_WRONLY);
url_split(proto, sizeof(proto), NULL, 0, hostname, sizeof(hostname), &port,
path, sizeof(path), s->filename);
if (port < 0)
port = RTMP_DEFAULT_PORT;
snprintf(buf, sizeof(buf), "tcp://%s:%d", hostname, port);
if (url_open(&rt->stream, buf, URL_RDWR) < 0) {
av_log(LOG_CONTEXT, AV_LOG_ERROR, "Cannot open connection %s\n", buf);
goto fail;
}
if (!rt->is_input) {
av_log(LOG_CONTEXT, AV_LOG_ERROR, "RTMP output is not supported yet.\n");
goto fail;
} else {
rt->state = STATE_START;
if (rtmp_handshake(s, rt))
return -1;
rt->chunk_size = 128;
rt->state = STATE_HANDSHAKED;
//extract "app" part from path
if (!strncmp(path, "/ondemand/", 10)) {
fname = path + 10;
memcpy(rt->app, "ondemand", 9);
} else {
char *p = strchr(path + 1, '/');
if (!p) {
fname = path + 1;
rt->app[0] = '\0';
} else {
char *c = strchr(p + 1, ':');
fname = strchr(p + 1, '/');
if (!fname || c < fname) {
fname = p + 1;
av_strlcpy(rt->app, path + 1, p - path);
} else {
fname++;
av_strlcpy(rt->app, path + 1, fname - path - 1);
}
}
}
if (!strchr(fname, ':') &&
(!strcmp(fname + strlen(fname) - 4, ".f4v") ||
!strcmp(fname + strlen(fname) - 4, ".mp4"))) {
memcpy(rt->playpath, "mp4:", 5);
} else {
rt->playpath[0] = 0;
}
strncat(rt->playpath, fname, sizeof(rt->playpath) - 5);
av_log(LOG_CONTEXT, AV_LOG_DEBUG, "Proto = %s, path = %s, app = %s, fname = %s\n",
proto, path, rt->app, rt->playpath);
gen_connect(s, rt, proto, hostname, port);
do {
ret = get_packet(s, 1);
} while (ret == EAGAIN);
if (ret < 0)
goto fail;
// generate FLV header for demuxer
rt->flv_size = 13;
rt->flv_data = av_realloc(rt->flv_data, rt->flv_size);
rt->flv_off = 0;
memcpy(rt->flv_data, "FLV\1\5\0\0\0\011\0\0\0\0", rt->flv_size);
}
s->max_packet_size = url_get_max_packet_size(rt->stream);
s->is_streamed = 1;
return 0;
fail:
rtmp_close(s);
return AVERROR(EIO);
}
static int rtmp_read(URLContext *s, uint8_t *buf, int size)
{
RTMPContext *rt = s->priv_data;
int orig_size = size;
int ret;
while (size > 0) {
int data_left = rt->flv_size - rt->flv_off;
if (data_left >= size) {
memcpy(buf, rt->flv_data + rt->flv_off, size);
rt->flv_off += size;
return orig_size;
}
if (data_left > 0) {
memcpy(buf, rt->flv_data + rt->flv_off, data_left);
buf += data_left;
size -= data_left;
rt->flv_off = rt->flv_size;
}
if ((ret = get_packet(s, 0)) < 0)
return ret;
}
return orig_size;
}
static int rtmp_write(URLContext *h, uint8_t *buf, int size)
{
return 0;
}
URLProtocol rtmp_protocol = {
"rtmp",
rtmp_open,
rtmp_read,
rtmp_write,
NULL, /* seek */
rtmp_close,
};
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