diff options
Diffstat (limited to 'src/output/raop_output_plugin.c')
| -rw-r--r-- | src/output/raop_output_plugin.c | 1050 |
1 files changed, 1050 insertions, 0 deletions
diff --git a/src/output/raop_output_plugin.c b/src/output/raop_output_plugin.c new file mode 100644 index 000000000..68d6897cb --- /dev/null +++ b/src/output/raop_output_plugin.c @@ -0,0 +1,1050 @@ +/* + * Copyright (C) 2003-2011 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" +#include "raop_output_plugin.h" +#include "output_api.h" +#include "mixer_list.h" +#include "fd_util.h" +#include "ntp_server.h" +#include "rtsp_client.h" +#include "glib_compat.h" + +#include <glib.h> +#include <unistd.h> +#include <sys/time.h> +#include <openssl/aes.h> +#include <openssl/err.h> +#include <openssl/rand.h> +#include <openssl/rsa.h> +#include <openssl/engine.h> + +#ifndef WIN32 +#include <arpa/inet.h> +#include <sys/socket.h> +#include <netdb.h> +#endif + +#undef G_LOG_DOMAIN +#define G_LOG_DOMAIN "raop" + +struct play_state { + bool playing; + unsigned short seq_num; + unsigned int rtptime; + unsigned int sync_src; + unsigned int start_rtptime; + struct timeval start_time; + struct timeval last_send; +}; + +/*********************************************************************/ + +enum pause_state { + NO_PAUSE = 0, + OP_PAUSE, + NODATA_PAUSE, +}; + +#define MINIMUM_SAMPLE_SIZE 32 + +#define RAOP_FD_READ (1<<0) +#define RAOP_FD_WRITE (1<<1) + +/*********************************************************************/ + +struct encrypt_data { + AES_KEY ctx; + unsigned char iv[16]; // initialization vector for aes-cbc + unsigned char nv[16]; // next vector for aes-cbc + unsigned char key[16]; // key for aes-cbc +}; + +/*********************************************************************/ + +struct raop_data { + struct audio_output base; + + struct rtspcl_data *rtspcl; + const char *addr; // target host address + short rtsp_port; + struct sockaddr_in ctrl_addr; + struct sockaddr_in data_addr; + + bool is_master; + struct raop_data *next; + + unsigned volume; + + GMutex *control_mutex; + + bool started; + bool paused; +}; + +/*********************************************************************/ + +struct control_data { + unsigned short port; + int fd; +}; + +/*********************************************************************/ + +#define NUMSAMPLES 352 +#define RAOP_BUFFER_SIZE NUMSAMPLES * 4 +#define RAOP_HEADER_SIZE 12 +#define ALAC_MAX_HEADER_SIZE 8 +#define RAOP_MAX_PACKET_SIZE RAOP_BUFFER_SIZE + RAOP_HEADER_SIZE + ALAC_MAX_HEADER_SIZE + +// session +struct raop_session_data { + struct raop_data *raop_list; + struct ntp_server ntp; + struct control_data ctrl; + struct encrypt_data encrypt; + struct play_state play_state; + + int data_fd; + + unsigned char buffer[RAOP_BUFFER_SIZE]; + size_t bufferSize; + + unsigned char data[RAOP_MAX_PACKET_SIZE]; + int wblk_wsize; + int wblk_remsize; + + GMutex *data_mutex; + GMutex *list_mutex; +}; + +/*********************************************************************/ + +static struct raop_session_data *raop_session = NULL; + +/** + * The quark used for GError.domain. + */ +static inline GQuark +raop_output_quark(void) +{ + return g_quark_from_static_string("raop_output"); +} + +static void +raop_session_free(struct raop_session_data *session) +{ + assert(session != NULL); + assert(session->raop_list == NULL); + + ntp_server_close(&session->ntp); + + if (session->data_mutex != NULL) + g_mutex_free(session->data_mutex); + + if (session->list_mutex != NULL) + g_mutex_free(session->list_mutex); + + if (raop_session->data_fd >= 0) + close_socket(raop_session->data_fd); + + if (raop_session->ctrl.fd >= 0) + close_socket(raop_session->ctrl.fd); + + g_free(session); +} + +static struct raop_session_data * +raop_session_new(GError **error_r) +{ + struct raop_session_data *session = g_new(struct raop_session_data, 1); + session->raop_list = NULL; + + session->data_mutex = g_mutex_new(); + session->list_mutex = g_mutex_new(); + + ntp_server_init(&session->ntp); + session->ctrl.port = 6001; + session->ctrl.fd = -1; + session->play_state.playing = false; + session->play_state.seq_num = (short) g_random_int(); + session->play_state.rtptime = g_random_int(); + session->play_state.sync_src = g_random_int(); + session->play_state.last_send.tv_sec = 0; + session->play_state.last_send.tv_usec = 0; + session->data_fd = -1; + + if (!RAND_bytes(session->encrypt.iv, sizeof(session->encrypt.iv)) || + !RAND_bytes(session->encrypt.key, sizeof(session->encrypt.key))) { + raop_session_free(session); + g_set_error(error_r, raop_output_quark(), 0, + "RAND_bytes error code=%ld", ERR_get_error()); + return NULL; + } + memcpy(session->encrypt.nv, session->encrypt.iv, sizeof(session->encrypt.nv)); + for (unsigned i = 0; i < 16; i++) { + printf("0x%x ", session->encrypt.key[i]); + } + printf("\n"); + AES_set_encrypt_key(session->encrypt.key, 128, &session->encrypt.ctx); + + memset(session->buffer, 0, RAOP_BUFFER_SIZE); + session->bufferSize = 0; + + return session; +} + +static struct raop_data * +new_raop_data(const struct config_param *param, GError **error_r) +{ + struct raop_data *ret = g_new(struct raop_data, 1); + if (!ao_base_init(&ret->base, &raop_output_plugin, param, error_r)) { + g_free(ret); + return NULL; + } + + ret->control_mutex = g_mutex_new(); + + ret->next = NULL; + ret->is_master = 0; + ret->started = 0; + ret->paused = 0; + + if (raop_session == NULL && + (raop_session = raop_session_new(error_r)) == NULL) { + g_mutex_free(ret->control_mutex); + ao_base_finish(&ret->base); + g_free(ret); + return NULL; + } + + return ret; +} + +/* + * remove one character from a string + * return the number of deleted characters + */ +static int +remove_char_from_string(char *str, char c) +{ + char *src, *dst; + + /* skip all characters that don't need to be copied */ + src = strchr(str, c); + if (!src) + return 0; + + for (dst = src; *src; src++) + if (*src != c) + *(dst++) = *src; + + *dst = '\0'; + + return src - dst; +} + +/* bind an opened socket to specified hostname and port. + * if hostname=NULL, use INADDR_ANY. + * if *port=0, use dynamically assigned port + */ +static int bind_host(int sd, char *hostname, unsigned long ulAddr, + unsigned short *port, GError **error_r) +{ + struct sockaddr_in my_addr; + socklen_t nlen = sizeof(struct sockaddr); + struct hostent *h; + + memset(&my_addr, 0, sizeof(my_addr)); + /* use specified hostname */ + if (hostname) { + /* get server IP address (no check if input is IP address or DNS name) */ + h = gethostbyname(hostname); + if (h == NULL) { + if (strstr(hostname, "255.255.255.255") == hostname) { + my_addr.sin_addr.s_addr=-1; + } else { + if ((my_addr.sin_addr.s_addr = inet_addr(hostname)) == 0xFFFFFFFF) { + g_set_error(error_r, raop_output_quark(), 0, + "failed to resolve host '%s'", + hostname); + return -1; + } + } + my_addr.sin_family = AF_INET; + } else { + my_addr.sin_family = h->h_addrtype; + memcpy((char *) &my_addr.sin_addr.s_addr, + h->h_addr_list[0], h->h_length); + } + } else { + // if hostname=NULL, use INADDR_ANY + if (ulAddr) + my_addr.sin_addr.s_addr = ulAddr; + else + my_addr.sin_addr.s_addr = htonl(INADDR_ANY); + my_addr.sin_family = AF_INET; + } + + /* bind a specified port */ + my_addr.sin_port = htons(*port); + + if (bind(sd, (struct sockaddr *) &my_addr, sizeof(my_addr)) < 0) { + g_set_error(error_r, raop_output_quark(), errno, + "failed to bind socket: %s", + g_strerror(errno)); + return -1; + } + + if (*port == 0) { + getsockname(sd, (struct sockaddr *) &my_addr, &nlen); + *port = ntohs(my_addr.sin_port); + } + + return 0; +} + +/* + * open udp port + */ +static int +open_udp_socket(char *hostname, unsigned short *port, + GError **error_r) +{ + int sd; + const int size = 30000; + + /* socket creation */ + sd = socket(PF_INET, SOCK_DGRAM, 0); + if (sd < 0) { + g_set_error(error_r, raop_output_quark(), errno, + "failed to create UDP socket: %s", + g_strerror(errno)); + return -1; + } + if (setsockopt(sd, SOL_SOCKET, SO_SNDBUF, (const char *) &size, sizeof(size)) < 0) { + g_set_error(error_r, raop_output_quark(), errno, + "failed to set UDP buffer size: %s", + g_strerror(errno)); + return -1; + } + if (bind_host(sd, hostname, 0, port, error_r)) { + close_socket(sd); + return -1; + } + + return sd; +} + +static bool +get_sockaddr_by_host(const char *host, short destport, + struct sockaddr_in *addr, + GError **error_r) +{ + struct hostent *h; + + h = gethostbyname(host); + if (h) { + addr->sin_family = h->h_addrtype; + memcpy((char *) &addr->sin_addr.s_addr, h->h_addr_list[0], h->h_length); + } else { + addr->sin_family = AF_INET; + if ((addr->sin_addr.s_addr=inet_addr(host))==0xFFFFFFFF) { + g_set_error(error_r, rtsp_client_quark(), 0, + "failed to resolve host '%s'", host); + return false; + } + } + addr->sin_port = htons(destport); + return true; +} + +/* + * Calculate the current NTP time, store it in the buffer. + */ +static void +fill_int(unsigned char *buffer, uint32_t value) +{ + uint32_t be = GINT32_TO_BE(value); + memcpy(buffer, &be, sizeof(be)); +} + +/* + * Store time in the NTP format in the buffer + */ +static void +fill_time_buffer_with_time(unsigned char *buffer, struct timeval *tout) +{ + unsigned long secs_to_baseline = 964697997; + double fraction; + unsigned long long_fraction; + unsigned long secs; + + fraction = ((double) tout->tv_usec) / 1000000.0; + long_fraction = (unsigned long) (fraction * 256.0 * 256.0 * 256.0 * 256.0); + secs = secs_to_baseline + tout->tv_sec; + fill_int(buffer, secs); + fill_int(buffer + 4, long_fraction); +} + +static void +get_time_for_rtp(struct play_state *state, struct timeval *tout) +{ + unsigned long rtp_diff = state->rtptime - state->start_rtptime; + unsigned long add_secs = rtp_diff / 44100; + unsigned long add_usecs = (((rtp_diff % 44100) * 10000) / 441) % 1000000; + tout->tv_sec = state->start_time.tv_sec + add_secs; + tout->tv_usec = state->start_time.tv_usec + add_usecs; + if (tout->tv_usec >= 1000000) { + tout->tv_sec++; + tout->tv_usec = tout->tv_usec % 1000000; + } +} + +/* + * Send a control command + */ +static bool +send_control_command(struct control_data *ctrl, struct raop_data *rd, + struct play_state *state, + GError **error_r) +{ + unsigned char buf[20]; + int diff; + int num_bytes; + struct timeval ctrl_time; + + diff = 88200; + if (rd->started) { + buf[0] = 0x80; + diff += NUMSAMPLES; + } else { + buf[0] = 0x90; + state->playing = true; + state->start_rtptime = state->rtptime; + } + buf[1] = 0xd4; + buf[2] = 0x00; + buf[3] = 0x07; + fill_int(buf + 4, state->rtptime - diff); + get_time_for_rtp(state, &ctrl_time); + fill_time_buffer_with_time(buf + 8, &ctrl_time); + fill_int(buf + 16, state->rtptime); + + num_bytes = sendto(ctrl->fd, (const void *)buf, sizeof(buf), 0, + (struct sockaddr *)&rd->ctrl_addr, + sizeof(rd->ctrl_addr)); + if (num_bytes < 0) { + g_set_error(error_r, raop_output_quark(), errno, + "Unable to send control command: %s", + g_strerror(errno)); + return false; + } + + return true; +} + +static int rsa_encrypt(const unsigned char *text, int len, unsigned char *res) +{ + RSA *rsa; + gsize usize; + unsigned char *modulus; + unsigned char *exponent; + int size; + + char n[] = + "59dE8qLieItsH1WgjrcFRKj6eUWqi+bGLOX1HL3U3GhC/j0Qg90u3sG/1CUtwC" + "5vOYvfDmFI6oSFXi5ELabWJmT2dKHzBJKa3k9ok+8t9ucRqMd6DZHJ2YCCLlDR" + "KSKv6kDqnw4UwPdpOMXziC/AMj3Z/lUVX1G7WSHCAWKf1zNS1eLvqr+boEjXuB" + "OitnZ/bDzPHrTOZz0Dew0uowxf/+sG+NCK3eQJVxqcaJ/vEHKIVd2M+5qL71yJ" + "Q+87X6oV3eaYvt3zWZYD6z5vYTcrtij2VZ9Zmni/UAaHqn9JdsBWLUEpVviYnh" + "imNVvYFZeCXg/IdTQ+x4IRdiXNv5hEew=="; + char e[] = "AQAB"; + + rsa = RSA_new(); + + modulus = g_base64_decode(n, &usize); + rsa->n = BN_bin2bn(modulus, usize, NULL); + exponent = g_base64_decode(e, &usize); + rsa->e = BN_bin2bn(exponent, usize, NULL); + g_free(modulus); + g_free(exponent); + size = RSA_public_encrypt(len, text, res, rsa, RSA_PKCS1_OAEP_PADDING); + + RSA_free(rsa); + return size; +} + +static int +raop_encrypt(struct encrypt_data *encryp, unsigned char *data, int size) +{ + // any bytes that fall beyond the last 16 byte page should be sent + // in the clear + int alt_size = size - (size % 16); + + memcpy(encryp->nv, encryp->iv, 16); + + AES_cbc_encrypt(data, data, alt_size, &encryp->ctx, encryp->nv, 1); + + return size; +} + +/* write bits filed data, *bpos=0 for msb, *bpos=7 for lsb + d=data, blen=length of bits field +*/ +static inline void +bits_write(unsigned char **p, unsigned char d, int blen, int *bpos) +{ + int lb, rb, bd; + lb =7 - *bpos; + rb = lb - blen + 1; + if (rb >= 0) { + bd = d << rb; + if (*bpos) + **p |= bd; + else + **p = bd; + *bpos += blen; + } else { + bd = d >> -rb; + **p |= bd; + *p += 1; + **p = d << (8 + rb); + *bpos = -rb; + } +} + +static bool +wrap_pcm(unsigned char *buffer, int bsize, int *size, unsigned char *inData, int inSize) +{ + unsigned char one[4]; + int count = 0; + int bpos = 0; + unsigned char *bp = buffer; + int i, nodata = 0; + bits_write(&bp, 1, 3, &bpos); // channel=1, stereo + bits_write(&bp, 0, 4, &bpos); // unknown + bits_write(&bp, 0, 8, &bpos); // unknown + bits_write(&bp, 0, 4, &bpos); // unknown + if (bsize != 4096 && false) + bits_write(&bp, 1, 1, &bpos); // hassize + else + bits_write(&bp, 0, 1, &bpos); // hassize + bits_write(&bp, 0, 2, &bpos); // unused + bits_write(&bp, 1, 1, &bpos); // is-not-compressed + if (bsize != 4096 && false) { + // size of data, integer, big endian + bits_write(&bp, (bsize >> 24) & 0xff, 8, &bpos); + bits_write(&bp, (bsize >> 16) & 0xff, 8, &bpos); + bits_write(&bp, (bsize >> 8) & 0xff, 8, &bpos); + bits_write(&bp, bsize&0xff, 8, &bpos); + } + while (1) { + if (inSize <= count * 4) nodata = 1; + if (nodata) break; + one[0] = inData[count * 4]; + one[1] = inData[count * 4 + 1]; + one[2] = inData[count * 4 + 2]; + one[3] = inData[count * 4 + 3]; + +#if BYTE_ORDER == BIG_ENDIAN + bits_write(&bp, one[0], 8, &bpos); + bits_write(&bp, one[1], 8, &bpos); + bits_write(&bp, one[2], 8, &bpos); + bits_write(&bp, one[3], 8, &bpos); +#else + bits_write(&bp, one[1], 8, &bpos); + bits_write(&bp, one[0], 8, &bpos); + bits_write(&bp, one[3], 8, &bpos); + bits_write(&bp, one[2], 8, &bpos); +#endif + + if (++count == bsize) break; + } + if (!count) return false; // when no data at all, it should stop playing + /* when readable size is less than bsize, fill 0 at the bottom */ + for(i = 0; i < (bsize - count) * 4; i++) { + bits_write(&bp, 0, 8, &bpos); + } + *size = (int)(bp - buffer); + if (bpos) *size += 1; + return true; +} + +static bool +raopcl_connect(struct raop_data *rd, GError **error_r) +{ + unsigned char buf[4 + 8 + 16]; + char sid[16]; + char sci[24]; + char act_r[17]; + char *sac=NULL, *key = NULL, *iv = NULL; + char sdp[1024]; + int rval = false; + unsigned char rsakey[512]; + struct timeval current_time; + unsigned int sessionNum; + int i; + + + gettimeofday(¤t_time,NULL); + sessionNum = current_time.tv_sec + 2082844804; + + RAND_bytes(buf, sizeof(buf)); + sprintf(act_r, "%u", (unsigned int) g_random_int()); + sprintf(sid, "%u", sessionNum); + sprintf(sci, "%08x%08x", *((int *)(buf + 4)), *((int *)(buf + 8))); + sac = g_base64_encode(buf + 12, 16); + rd->rtspcl = rtspcl_open(); + rtspcl_set_useragent(rd->rtspcl, "iTunes/8.1.1 (Macintosh; U; PPC Mac OS X 10.4)"); + rtspcl_add_exthds(rd->rtspcl, "Client-Instance", sci); + rtspcl_add_exthds(rd->rtspcl, "DACP-ID", sci); + rtspcl_add_exthds(rd->rtspcl, "Active-Remote", act_r); + if (!rtspcl_connect(rd->rtspcl, rd->addr, rd->rtsp_port, sid, error_r)) + goto erexit; + + i = rsa_encrypt(raop_session->encrypt.key, 16, rsakey); + key = g_base64_encode(rsakey, i); + remove_char_from_string(key, '='); + iv = g_base64_encode(raop_session->encrypt.iv, 16); + remove_char_from_string(iv, '='); + sprintf(sdp, + "v=0\r\n" + "o=iTunes %s 0 IN IP4 %s\r\n" + "s=iTunes\r\n" + "c=IN IP4 %s\r\n" + "t=0 0\r\n" + "m=audio 0 RTP/AVP 96\r\n" + "a=rtpmap:96 AppleLossless\r\n" + "a=fmtp:96 %d 0 16 40 10 14 2 255 0 0 44100\r\n" + "a=rsaaeskey:%s\r\n" + "a=aesiv:%s\r\n", + sid, rtspcl_local_ip(rd->rtspcl), rd->addr, NUMSAMPLES, key, iv); + remove_char_from_string(sac, '='); + // rtspcl_add_exthds(rd->rtspcl, "Apple-Challenge", sac); + if (!rtspcl_announce_sdp(rd->rtspcl, sdp, error_r)) + goto erexit; + // if (!rtspcl_mark_del_exthds(rd->rtspcl, "Apple-Challenge")) goto erexit; + if (!rtspcl_setup(rd->rtspcl, NULL, + raop_session->ctrl.port, raop_session->ntp.port, + error_r)) + goto erexit; + + if (!get_sockaddr_by_host(rd->addr, rd->rtspcl->control_port, + &rd->ctrl_addr, error_r)) + goto erexit; + + if (!get_sockaddr_by_host(rd->addr, rd->rtspcl->server_port, + &rd->data_addr, error_r)) + goto erexit; + + if (!rtspcl_record(rd->rtspcl, + raop_session->play_state.seq_num, + raop_session->play_state.rtptime, + error_r)) + goto erexit; + + rval = true; + + erexit: + g_free(sac); + g_free(key); + g_free(iv); + return rval; +} + +static int +difference (struct timeval *t1, struct timeval *t2) +{ + int ret = 150000000; + if (t1->tv_sec - t2->tv_sec < 150) { + ret = (t1->tv_sec - t2->tv_sec) * 1000000; + ret += t1->tv_usec - t2->tv_usec; + } + return ret; +} + +/* + * With airtunes version 2, we don't get responses back when we send audio + * data. The only requests we get from the airtunes device are timing + * requests. + */ +static bool +send_audio_data(int fd, GError **error_r) +{ + int i = 0; + struct timeval current_time, rtp_time; + struct raop_data *rd = raop_session->raop_list; + + get_time_for_rtp(&raop_session->play_state, &rtp_time); + gettimeofday(¤t_time, NULL); + int diff = difference(&rtp_time, ¤t_time); + if (diff > 0) + g_usleep(diff); + + gettimeofday(&raop_session->play_state.last_send, NULL); + while (rd) { + if (rd->started) { + raop_session->data[1] = 0x60; + } else { + rd->started = true; + raop_session->data[1] = 0xe0; + } + i = sendto(fd, (const void *)(raop_session->data + raop_session->wblk_wsize), + raop_session->wblk_remsize, 0, (struct sockaddr *) &rd->data_addr, + sizeof(rd->data_addr)); + if (i < 0) { + g_set_error(error_r, raop_output_quark(), errno, + "write error: %s", + g_strerror(errno)); + return false; + } + if (i == 0) { + g_set_error_literal(error_r, raop_output_quark(), 0, + "disconnected on the other end"); + return false; + } + rd = rd->next; + } + raop_session->wblk_wsize += i; + raop_session->wblk_remsize -= i; + + return true; +} + +static struct audio_output * +raop_output_init(const struct config_param *param, GError **error_r) +{ + const char *host = config_get_block_string(param, "host", NULL); + if (host == NULL) { + g_set_error_literal(error_r, raop_output_quark(), 0, + "missing option 'host'"); + return NULL; + } + + struct raop_data *rd; + + rd = new_raop_data(param, error_r); + if (rd == NULL) + return NULL; + + rd->addr = host; + rd->rtsp_port = config_get_block_unsigned(param, "port", 5000); + rd->volume = config_get_block_unsigned(param, "volume", 75); + return &rd->base; +} + +static bool +raop_set_volume_local(struct raop_data *rd, int volume, GError **error_r) +{ + char vol_str[128]; + sprintf(vol_str, "volume: %d.000000\r\n", volume); + return rtspcl_set_parameter(rd->rtspcl, vol_str, error_r); +} + + +static void +raop_output_finish(struct audio_output *ao) +{ + struct raop_data *rd = (struct raop_data *)ao; + + if (rd->rtspcl) + rtspcl_close(rd->rtspcl); + + g_mutex_free(rd->control_mutex); + ao_base_finish(&rd->base); + g_free(rd); +} + +#define RAOP_VOLUME_MIN -30 +#define RAOP_VOLUME_MAX 0 + +int +raop_get_volume(struct raop_data *rd) +{ + return rd->volume; +} + +bool +raop_set_volume(struct raop_data *rd, unsigned volume, GError **error_r) +{ + int raop_volume; + bool rval; + + //set parameter volume + if (volume == 0) { + raop_volume = -144; + } else { + raop_volume = RAOP_VOLUME_MIN + + (RAOP_VOLUME_MAX - RAOP_VOLUME_MIN) * volume / 100; + } + g_mutex_lock(rd->control_mutex); + rval = raop_set_volume_local(rd, raop_volume, error_r); + if (rval) rd->volume = volume; + g_mutex_unlock(rd->control_mutex); + + return rval; +} + +static void +raop_output_cancel(struct audio_output *ao) +{ + //flush + struct key_data kd; + struct raop_data *rd = (struct raop_data *)ao; + int flush_diff = 1; + + rd->started = 0; + if (rd->is_master) { + raop_session->play_state.playing = false; + } + if (rd->paused) { + return; + } + + g_mutex_lock(rd->control_mutex); + static char rtp_key[] = "RTP-Info"; + kd.key = rtp_key; + char buf[128]; + sprintf(buf, "seq=%d; rtptime=%d", raop_session->play_state.seq_num + flush_diff, raop_session->play_state.rtptime + NUMSAMPLES * flush_diff); + kd.data = buf; + kd.next = NULL; + exec_request(rd->rtspcl, "FLUSH", NULL, NULL, 1, + &kd, NULL, NULL); + g_mutex_unlock(rd->control_mutex); +} + +static bool +raop_output_pause(struct audio_output *ao) +{ + struct raop_data *rd = (struct raop_data *)ao; + + rd->paused = true; + return true; +} + +/** + * Remove the output from the session's list. Caller must not lock + * the list_mutex. + */ +static void +raop_output_remove(struct raop_data *rd) +{ + struct raop_data *iter = raop_session->raop_list; + struct raop_data *prev = NULL; + + g_mutex_lock(raop_session->list_mutex); + while (iter) { + if (iter == rd) { + if (prev != NULL) { + prev->next = rd->next; + } else { + raop_session->raop_list = rd->next; + } + if (rd->is_master && raop_session->raop_list != NULL) { + raop_session->raop_list->is_master = true; + } + rd->next = NULL; + rd->is_master = false; + break; + } + prev = iter; + iter = iter->next; + } + g_mutex_unlock(raop_session->list_mutex); + + if (raop_session->raop_list == NULL) { + raop_session_free(raop_session); + raop_session = NULL; + } +} + +static void +raop_output_close(struct audio_output *ao) +{ + //teardown + struct raop_data *rd = (struct raop_data *)ao; + + raop_output_remove(rd); + + g_mutex_lock(rd->control_mutex); + exec_request(rd->rtspcl, "TEARDOWN", NULL, NULL, 0, + NULL, NULL, NULL); + g_mutex_unlock(rd->control_mutex); + + rd->started = 0; +} + + +static bool +raop_output_open(struct audio_output *ao, struct audio_format *audio_format, GError **error_r) +{ + //setup, etc. + struct raop_data *rd = (struct raop_data *)ao; + + g_mutex_lock(raop_session->list_mutex); + if (raop_session->raop_list == NULL) { + // first raop, need to initialize session data + unsigned short myport = 0; + raop_session->raop_list = rd; + rd->is_master = true; + + raop_session->data_fd = open_udp_socket(NULL, &myport, + error_r); + if (raop_session->data_fd < 0) + return false; + + if (!ntp_server_open(&raop_session->ntp, error_r)) + return false; + + raop_session->ctrl.fd = + open_udp_socket(NULL, &raop_session->ctrl.port, + error_r); + if (raop_session->ctrl.fd < 0) { + ntp_server_close(&raop_session->ntp); + raop_session->ctrl.fd = -1; + g_mutex_unlock(raop_session->list_mutex); + return false; + } + } + g_mutex_unlock(raop_session->list_mutex); + + audio_format->format = SAMPLE_FORMAT_S16; + if (!raopcl_connect(rd, error_r)) { + raop_output_remove(rd); + return false; + } + + if (!raop_set_volume(rd, rd->volume, error_r)) { + raop_output_remove(rd); + return false; + } + + g_mutex_lock(raop_session->list_mutex); + if (!rd->is_master) { + rd->next = raop_session->raop_list; + raop_session->raop_list = rd; + } + g_mutex_unlock(raop_session->list_mutex); + return true; +} + +static size_t +raop_output_play(struct audio_output *ao, const void *chunk, size_t size, + GError **error_r) +{ + //raopcl_send_sample + struct raop_data *rd = (struct raop_data *)ao; + size_t rval = 0, orig_size = size; + + rd->paused = false; + if (!rd->is_master) { + // only process data for the master raop + return size; + } + + g_mutex_lock(raop_session->data_mutex); + + if (raop_session->play_state.rtptime <= NUMSAMPLES) { + // looped over, need new reference point to calculate correct times + raop_session->play_state.playing = false; + } + + while (raop_session->bufferSize + size >= RAOP_BUFFER_SIZE) { + // ntp header + unsigned char header[] = { + 0x80, 0x60, 0x00, 0x00, + // rtptime + 0x00, 0x00, 0x00, 0x00, + // device + 0x7e, 0xad, 0xd2, 0xd3, + }; + + + int count = 0; + int copyBytes = RAOP_BUFFER_SIZE - raop_session->bufferSize; + + if (!raop_session->play_state.playing || + raop_session->play_state.seq_num % (44100 / NUMSAMPLES + 1) == 0) { + struct raop_data *iter; + g_mutex_lock(raop_session->list_mutex); + if (!raop_session->play_state.playing) { + gettimeofday(&raop_session->play_state.start_time,NULL); + } + iter = raop_session->raop_list; + while (iter) { + if (!send_control_command(&raop_session->ctrl, iter, + &raop_session->play_state, + error_r)) + goto erexit; + + iter = iter->next; + } + g_mutex_unlock(raop_session->list_mutex); + } + + fill_int(header + 8, raop_session->play_state.sync_src); + + memcpy(raop_session->buffer + raop_session->bufferSize, chunk, copyBytes); + raop_session->bufferSize += copyBytes; + chunk = ((const char *)chunk) + copyBytes; + size -= copyBytes; + + if (!wrap_pcm(raop_session->data + RAOP_HEADER_SIZE, NUMSAMPLES, &count, raop_session->buffer, RAOP_BUFFER_SIZE)) { + g_warning("unable to encode %d bytes properly\n", RAOP_BUFFER_SIZE); + } + + memcpy(raop_session->data, header, RAOP_HEADER_SIZE); + raop_session->data[2] = raop_session->play_state.seq_num >> 8; + raop_session->data[3] = raop_session->play_state.seq_num & 0xff; + raop_session->play_state.seq_num ++; + + fill_int(raop_session->data + 4, raop_session->play_state.rtptime); + raop_session->play_state.rtptime += NUMSAMPLES; + + raop_encrypt(&raop_session->encrypt, raop_session->data + RAOP_HEADER_SIZE, count); + raop_session->wblk_remsize = count + RAOP_HEADER_SIZE; + raop_session->wblk_wsize = 0; + + if (!send_audio_data(raop_session->data_fd, error_r)) + goto erexit; + + raop_session->bufferSize = 0; + } + if (size > 0) { + memcpy(raop_session->buffer + raop_session->bufferSize, chunk, size); + raop_session->bufferSize += size; + } + rval = orig_size; + erexit: + g_mutex_unlock(raop_session->data_mutex); + return rval; +} + +const struct audio_output_plugin raop_output_plugin = { + .name = "raop", + .init = raop_output_init, + .finish = raop_output_finish, + .open = raop_output_open, + .play = raop_output_play, + .cancel = raop_output_cancel, + .pause = raop_output_pause, + .close = raop_output_close, + .mixer_plugin = &raop_mixer_plugin, +}; 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