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record.c
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record.c
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/*! \file record.h
* \author Lorenzo Miniero <lorenzo@meetecho.com>
* \copyright GNU General Public License v3
* \brief Audio/Video recorder
* \details Implementation of a simple recorder utility that plugins
* can make use of to record audio/video frames to a Janus file. This
* file just saves RTP frames in a structured way, so that they can be
* post-processed later on to get a valid container file (e.g., a .opus
* file for Opus audio or a .webm file for VP8 video) and keep things
* simpler on the plugin and core side. Check the \ref recordings
* documentation for more details.
* \note If you want to record both audio and video, you'll have to use
* two different recorders. Any muxing in the same container will have
* to be done in the post-processing phase.
*
* \ingroup core
* \ref core
*/
#include <arpa/inet.h>
#include <sys/stat.h>
#include <errno.h>
#include <libgen.h>
#include <glib.h>
#include <jansson.h>
#include "record.h"
#include "debug.h"
#include "utils.h"
#define htonll(x) ((1==htonl(1)) ? (x) : ((gint64)htonl((x) & 0xFFFFFFFF) << 32) | htonl((x) >> 32))
#define ntohll(x) ((1==ntohl(1)) ? (x) : ((gint64)ntohl((x) & 0xFFFFFFFF) << 32) | ntohl((x) >> 32))
/* Info header in the structured recording */
static const char *header = "MJR00002";
/* Frame header in the structured recording */
static const char *frame_header = "MEET";
/* Whether the filenames should have a temporary extension, while saving, or not (default=false) */
static gboolean rec_tempname = FALSE;
/* Extension to add in case tempnames is true (default="tmp" --> ".tmp") */
static char *rec_tempext = NULL;
void janus_recorder_init(gboolean tempnames, const char *extension) {
JANUS_LOG(LOG_INFO, "Initializing recorder code\n");
if(tempnames) {
rec_tempname = TRUE;
if(extension == NULL) {
rec_tempext = g_strdup("tmp");
JANUS_LOG(LOG_INFO, " -- No extension provided, using default one (tmp)\n");
} else {
rec_tempext = g_strdup(extension);
JANUS_LOG(LOG_INFO, " -- Using temporary extension .%s\n", rec_tempext);
}
}
}
void janus_recorder_deinit(void) {
rec_tempname = FALSE;
g_free(rec_tempext);
}
static void janus_recorder_free(const janus_refcount *recorder_ref) {
janus_recorder *recorder = janus_refcount_containerof(recorder_ref, janus_recorder, ref);
/* This recorder can be destroyed, free all the resources */
janus_recorder_close(recorder);
g_free(recorder->dir);
recorder->dir = NULL;
g_free(recorder->filename);
recorder->filename = NULL;
if(recorder->file != NULL)
fclose(recorder->file);
recorder->file = NULL;
g_free(recorder->codec);
recorder->codec = NULL;
g_free(recorder->fmtp);
recorder->fmtp = NULL;
if(recorder->extensions != NULL)
g_hash_table_destroy(recorder->extensions);
g_free(recorder);
}
janus_recorder *janus_recorder_create(const char *dir, const char *codec, const char *filename) {
/* Same as janus_recorder_create_full, but with no fmtp */
return janus_recorder_create_full(dir, codec, NULL, filename);
}
janus_recorder *janus_recorder_create_full(const char *dir, const char *codec, const char *fmtp, const char *filename) {
janus_recorder_medium type = JANUS_RECORDER_AUDIO;
if(codec == NULL) {
JANUS_LOG(LOG_ERR, "Missing codec information\n");
return NULL;
}
if(!strcasecmp(codec, "vp8") || !strcasecmp(codec, "vp9") || !strcasecmp(codec, "h264")
|| !strcasecmp(codec, "av1") || !strcasecmp(codec, "h265")) {
type = JANUS_RECORDER_VIDEO;
} else if(!strcasecmp(codec, "opus") || !strcasecmp(codec, "multiopus")
|| !strcasecmp(codec, "g711") || !strcasecmp(codec, "pcmu") || !strcasecmp(codec, "pcma")
|| !strcasecmp(codec, "g722")) {
type = JANUS_RECORDER_AUDIO;
} else if(!strcasecmp(codec, "text") || !strcasecmp(codec, "binary")) {
/* Data channels may be text or binary, so that's what we can save too */
type = JANUS_RECORDER_DATA;
} else {
/* We don't recognize the codec: while we might go on anyway, we'd rather fail instead */
JANUS_LOG(LOG_ERR, "Unsupported codec '%s'\n", codec);
return NULL;
}
/* Create the recorder */
janus_recorder *rc = g_malloc0(sizeof(janus_recorder));
janus_refcount_init(&rc->ref, janus_recorder_free);
janus_rtp_switching_context_reset(&rc->context);
rc->dir = NULL;
rc->filename = NULL;
rc->file = NULL;
rc->codec = g_strdup(codec);
rc->fmtp = fmtp ? g_strdup(fmtp) : NULL;
rc->created = janus_get_real_time();
const char *rec_dir = NULL;
const char *rec_file = NULL;
char *copy_for_parent = NULL;
char *copy_for_base = NULL;
/* Check dir and filename values */
if(filename != NULL) {
/* Helper copies to avoid overwriting */
copy_for_parent = g_strdup(filename);
copy_for_base = g_strdup(filename);
/* Get filename parent folder */
const char *filename_parent = dirname(copy_for_parent);
/* Get filename base file */
const char *filename_base = basename(copy_for_base);
if(!dir) {
/* If dir is NULL we have to create filename_parent and filename_base */
rec_dir = filename_parent;
rec_file = filename_base;
} else {
/* If dir is valid we have to create dir and filename*/
rec_dir = dir;
rec_file = filename;
if(strcasecmp(filename_parent, ".") || strcasecmp(filename_base, filename)) {
JANUS_LOG(LOG_WARN, "Unsupported combination of dir and filename %s %s\n", dir, filename);
}
}
}
if(rec_dir != NULL) {
/* Check if this directory exists, and create it if needed */
struct stat s;
int err = stat(rec_dir, &s);
if(err == -1) {
if(ENOENT == errno) {
/* Directory does not exist, try creating it */
if(janus_mkdir(rec_dir, 0755) < 0) {
JANUS_LOG(LOG_ERR, "mkdir (%s) error: %d (%s)\n", rec_dir, errno, g_strerror(errno));
janus_recorder_destroy(rc);
g_free(copy_for_parent);
g_free(copy_for_base);
return NULL;
}
} else {
JANUS_LOG(LOG_ERR, "stat (%s) error: %d (%s)\n", rec_dir, errno, g_strerror(errno));
janus_recorder_destroy(rc);
g_free(copy_for_parent);
g_free(copy_for_base);
return NULL;
}
} else {
if(S_ISDIR(s.st_mode)) {
/* Directory exists */
JANUS_LOG(LOG_VERB, "Directory exists: %s\n", rec_dir);
} else {
/* File exists but it's not a directory? */
JANUS_LOG(LOG_ERR, "Not a directory? %s\n", rec_dir);
janus_recorder_destroy(rc);
g_free(copy_for_parent);
g_free(copy_for_base);
return NULL;
}
}
}
char newname[1024];
memset(newname, 0, 1024);
if(rec_file == NULL) {
/* Choose a random username */
if(!rec_tempname) {
/* Use .mjr as an extension right away */
g_snprintf(newname, 1024, "janus-recording-%"SCNu32".mjr", janus_random_uint32());
} else {
/* Append the temporary extension to .mjr, we'll rename when closing */
g_snprintf(newname, 1024, "janus-recording-%"SCNu32".mjr.%s", janus_random_uint32(), rec_tempext);
}
} else {
/* Just append the extension */
if(!rec_tempname) {
/* Use .mjr as an extension right away */
g_snprintf(newname, 1024, "%s.mjr", rec_file);
} else {
/* Append the temporary extension to .mjr, we'll rename when closing */
g_snprintf(newname, 1024, "%s.mjr.%s", rec_file, rec_tempext);
}
}
/* Try opening the file now */
if(rec_dir == NULL) {
/* Make sure folder to save to is not protected */
if(janus_is_folder_protected(newname)) {
JANUS_LOG(LOG_ERR, "Target recording path '%s' is in protected folder...\n", newname);
janus_recorder_destroy(rc);
g_free(copy_for_parent);
g_free(copy_for_base);
return NULL;
}
rc->file = fopen(newname, "wb");
} else {
char path[1024];
memset(path, 0, 1024);
g_snprintf(path, 1024, "%s/%s", rec_dir, newname);
/* Make sure folder to save to is not protected */
if(janus_is_folder_protected(path)) {
JANUS_LOG(LOG_ERR, "Target recording path '%s' is in protected folder...\n", path);
janus_recorder_destroy(rc);
g_free(copy_for_parent);
g_free(copy_for_base);
return NULL;
}
rc->file = fopen(path, "wb");
}
if(rc->file == NULL) {
JANUS_LOG(LOG_ERR, "fopen error: %d\n", errno);
janus_recorder_destroy(rc);
g_free(copy_for_parent);
g_free(copy_for_base);
return NULL;
}
if(rec_dir)
rc->dir = g_strdup(rec_dir);
rc->filename = g_strdup(newname);
rc->type = type;
/* Write the first part of the header */
size_t res = fwrite(header, sizeof(char), strlen(header), rc->file);
if(res != strlen(header)) {
JANUS_LOG(LOG_ERR, "Couldn't write .mjr header (%zu != %zu, %s)\n",
res, strlen(header), g_strerror(errno));
janus_recorder_destroy(rc);
g_free(copy_for_parent);
g_free(copy_for_base);
return NULL;
}
g_atomic_int_set(&rc->writable, 1);
/* We still need to also write the info header first */
g_atomic_int_set(&rc->header, 0);
janus_mutex_init(&rc->mutex);
/* Done */
g_atomic_int_set(&rc->destroyed, 0);
g_free(copy_for_parent);
g_free(copy_for_base);
return rc;
}
int janus_recorder_pause(janus_recorder *recorder) {
if(!recorder)
return -1;
if(g_atomic_int_compare_and_exchange(&recorder->paused, 0, 1))
return 0;
return -2;
}
int janus_recorder_resume(janus_recorder *recorder) {
if(!recorder)
return -1;
janus_mutex_lock_nodebug(&recorder->mutex);
if(g_atomic_int_compare_and_exchange(&recorder->paused, 1, 0)) {
if(recorder->type == JANUS_RECORDER_AUDIO) {
recorder->context.a_ts_reset = TRUE;
recorder->context.a_seq_reset = TRUE;
recorder->context.a_last_time = janus_get_monotonic_time();
} else if(recorder->type == JANUS_RECORDER_VIDEO) {
recorder->context.v_ts_reset = TRUE;
recorder->context.v_seq_reset = TRUE;
recorder->context.v_last_time = janus_get_monotonic_time();
}
janus_mutex_unlock_nodebug(&recorder->mutex);
return 0;
}
janus_mutex_unlock_nodebug(&recorder->mutex);
return -2;
}
int janus_recorder_add_extmap(janus_recorder *recorder, int id, const char *extmap) {
if(!recorder || g_atomic_int_get(&recorder->header) || id < 1 || id > 15 || extmap == NULL)
return -1;
janus_mutex_lock_nodebug(&recorder->mutex);
if(recorder->extensions == NULL)
recorder->extensions = g_hash_table_new_full(NULL, NULL, NULL, (GDestroyNotify)g_free);
g_hash_table_insert(recorder->extensions, GINT_TO_POINTER(id), g_strdup(extmap));
janus_mutex_unlock_nodebug(&recorder->mutex);
return 0;
}
int janus_recorder_encrypted(janus_recorder *recorder) {
if(!recorder)
return -1;
if(!g_atomic_int_get(&recorder->header)) {
recorder->encrypted = TRUE;
return 0;
}
return -1;
}
int janus_recorder_save_frame(janus_recorder *recorder, char *buffer, uint length) {
if(!recorder)
return -1;
janus_mutex_lock_nodebug(&recorder->mutex);
if(!buffer || length < 1) {
janus_mutex_unlock_nodebug(&recorder->mutex);
return -2;
}
if(!recorder->file) {
janus_mutex_unlock_nodebug(&recorder->mutex);
return -3;
}
if(!g_atomic_int_get(&recorder->writable)) {
janus_mutex_unlock_nodebug(&recorder->mutex);
return -4;
}
if(g_atomic_int_get(&recorder->paused)) {
janus_mutex_unlock_nodebug(&recorder->mutex);
return -5;
}
gint64 now = janus_get_monotonic_time();
if(!g_atomic_int_get(&recorder->header)) {
/* Write info header as a JSON formatted info */
json_t *info = json_object();
/* FIXME Codecs should be configurable in the future */
const char *type = NULL;
if(recorder->type == JANUS_RECORDER_AUDIO)
type = "a";
else if(recorder->type == JANUS_RECORDER_VIDEO)
type = "v";
else if(recorder->type == JANUS_RECORDER_DATA)
type = "d";
json_object_set_new(info, "t", json_string(type)); /* Audio/Video/Data */
json_object_set_new(info, "c", json_string(recorder->codec)); /* Media codec */
if(recorder->fmtp)
json_object_set_new(info, "f", json_string(recorder->fmtp)); /* Codec-specific info */
if(recorder->extensions) {
/* Add the extmaps to the JSON object */
json_t *extmaps = NULL;
GHashTableIter iter;
gpointer key, value;
g_hash_table_iter_init(&iter, recorder->extensions);
while(g_hash_table_iter_next(&iter, &key, &value)) {
int id = GPOINTER_TO_INT(key);
char *extmap = (char *)value;
if(id > 0 && id < 16 && extmap != NULL) {
if(extmaps == NULL)
extmaps = json_object();
char id_str[3];
g_snprintf(id_str, sizeof(id_str), "%d", id);
json_object_set_new(extmaps, id_str, json_string(extmap));
}
}
if(extmaps != NULL)
json_object_set_new(info, "x", extmaps);
}
json_object_set_new(info, "s", json_integer(recorder->created)); /* Created time */
json_object_set_new(info, "u", json_integer(janus_get_real_time())); /* First frame written time */
/* If media will be end-to-end encrypted, mark it in the recording header */
if(recorder->encrypted)
json_object_set_new(info, "e", json_true());
gchar *info_text = json_dumps(info, JSON_PRESERVE_ORDER);
json_decref(info);
if(info_text == NULL) {
JANUS_LOG(LOG_ERR, "Error converting header to text...\n");
janus_mutex_unlock_nodebug(&recorder->mutex);
return -5;
}
uint16_t info_bytes = htons(strlen(info_text));
size_t res = fwrite(&info_bytes, sizeof(uint16_t), 1, recorder->file);
if(res != 1) {
JANUS_LOG(LOG_WARN, "Couldn't write size of JSON header in .mjr file (%zu != %zu, %s), expect issues post-processing\n",
res, sizeof(uint16_t), g_strerror(errno));
}
res = fwrite(info_text, sizeof(char), strlen(info_text), recorder->file);
if(res != strlen(info_text)) {
JANUS_LOG(LOG_WARN, "Couldn't write JSON header in .mjr file (%zu != %zu, %s), expect issues post-processing\n",
res, strlen(info_text), g_strerror(errno));
}
free(info_text);
/* Done */
recorder->started = now;
g_atomic_int_set(&recorder->header, 1);
}
/* Write frame header (fixed part[4], timestamp[4], length[2]) */
size_t res = fwrite(frame_header, sizeof(char), strlen(frame_header), recorder->file);
if(res != strlen(frame_header)) {
JANUS_LOG(LOG_WARN, "Couldn't write frame header in .mjr file (%zu != %zu, %s), expect issues post-processing\n",
res, strlen(frame_header), g_strerror(errno));
}
uint32_t timestamp = (uint32_t)(now > recorder->started ? ((now - recorder->started)/1000) : 0);
timestamp = htonl(timestamp);
res = fwrite(×tamp, sizeof(uint32_t), 1, recorder->file);
if(res != 1) {
JANUS_LOG(LOG_WARN, "Couldn't write frame timestamp in .mjr file (%zu != %zu, %s), expect issues post-processing\n",
res, sizeof(uint32_t), g_strerror(errno));
}
uint16_t header_bytes = htons(recorder->type == JANUS_RECORDER_DATA ? (length+sizeof(gint64)) : length);
res = fwrite(&header_bytes, sizeof(uint16_t), 1, recorder->file);
if(res != 1) {
JANUS_LOG(LOG_WARN, "Couldn't write size of frame in .mjr file (%zu != %zu, %s), expect issues post-processing\n",
res, sizeof(uint16_t), g_strerror(errno));
}
if(recorder->type == JANUS_RECORDER_DATA) {
/* If it's data, then we need to prepend timing related info, as it's not there by itself */
gint64 now = htonll(janus_get_real_time());
res = fwrite(&now, sizeof(gint64), 1, recorder->file);
if(res != 1) {
JANUS_LOG(LOG_WARN, "Couldn't write data timestamp in .mjr file (%zu != %zu, %s), expect issues post-processing\n",
res, sizeof(gint64), g_strerror(errno));
}
}
/* Edit packet header if needed */
janus_rtp_header *header = (janus_rtp_header *)buffer;
uint32_t ssrc = 0;
uint16_t seq = 0;
if(recorder->type != JANUS_RECORDER_DATA) {
ssrc = ntohl(header->ssrc);
seq = ntohs(header->seq_number);
timestamp = ntohl(header->timestamp);
janus_rtp_header_update(header, &recorder->context, recorder->type == JANUS_RECORDER_VIDEO, 0);
}
/* Save packet on file */
int temp = 0, tot = length;
while(tot > 0) {
temp = fwrite(buffer+length-tot, sizeof(char), tot, recorder->file);
if(temp <= 0) {
JANUS_LOG(LOG_ERR, "Error saving frame...\n");
if(recorder->type != JANUS_RECORDER_DATA) {
/* Restore packet header data */
header->ssrc = htonl(ssrc);
header->seq_number = htons(seq);
header->timestamp = htonl(timestamp);
}
janus_mutex_unlock_nodebug(&recorder->mutex);
return -6;
}
tot -= temp;
}
if(recorder->type != JANUS_RECORDER_DATA) {
/* Restore packet header data */
header->ssrc = htonl(ssrc);
header->seq_number = htons(seq);
header->timestamp = htonl(timestamp);
}
/* Done */
janus_mutex_unlock_nodebug(&recorder->mutex);
return 0;
}
int janus_recorder_close(janus_recorder *recorder) {
if(!recorder || !g_atomic_int_compare_and_exchange(&recorder->writable, 1, 0))
return -1;
janus_mutex_lock_nodebug(&recorder->mutex);
if(recorder->file) {
fseek(recorder->file, 0L, SEEK_END);
size_t fsize = ftell(recorder->file);
fseek(recorder->file, 0L, SEEK_SET);
JANUS_LOG(LOG_INFO, "File is %zu bytes: %s\n", fsize, recorder->filename);
}
if(rec_tempname) {
/* We need to rename the file, to remove the temporary extension */
char newname[1024];
memset(newname, 0, 1024);
g_snprintf(newname, strlen(recorder->filename)-strlen(rec_tempext), "%s", recorder->filename);
char oldpath[1024];
memset(oldpath, 0, 1024);
char newpath[1024];
memset(newpath, 0, 1024);
if(recorder->dir) {
g_snprintf(newpath, 1024, "%s/%s", recorder->dir, newname);
g_snprintf(oldpath, 1024, "%s/%s", recorder->dir, recorder->filename);
} else {
g_snprintf(newpath, 1024, "%s", newname);
g_snprintf(oldpath, 1024, "%s", recorder->filename);
}
if(rename(oldpath, newpath) != 0) {
JANUS_LOG(LOG_ERR, "Error renaming %s to %s...\n", recorder->filename, newname);
} else {
JANUS_LOG(LOG_INFO, "Recording renamed: %s\n", newname);
g_free(recorder->filename);
recorder->filename = g_strdup(newname);
}
}
janus_mutex_unlock_nodebug(&recorder->mutex);
return 0;
}
void janus_recorder_destroy(janus_recorder *recorder) {
if(!recorder || !g_atomic_int_compare_and_exchange(&recorder->destroyed, 0, 1))
return;
janus_refcount_decrease(&recorder->ref);
}