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Diffstat (limited to 'formats/format_h264.c')
| -rw-r--r-- | formats/format_h264.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/formats/format_h264.c b/formats/format_h264.c new file mode 100644 index 000000000..bc70a75c7 --- /dev/null +++ b/formats/format_h264.c @@ -0,0 +1,186 @@ +/* + * Asterisk -- An open source telephony toolkit. + * + * Copyright (C) 1999 - 2005, Digium, Inc. + * + * Mark Spencer <markster@digium.com> + * + * See http://www.asterisk.org for more information about + * the Asterisk project. Please do not directly contact + * any of the maintainers of this project for assistance; + * the project provides a web site, mailing lists and IRC + * channels for your use. + * + * This program is free software, distributed under the terms of + * the GNU General Public License Version 2. See the LICENSE file + * at the top of the source tree. + */ + +/*! \file + * + * \brief Save to raw, headerless h264 data. + * \arg File name extension: h264 + * \ingroup formats + * \arg See \ref AstVideo + */ + +#include "asterisk.h" + +ASTERISK_FILE_VERSION(__FILE__, "$Revision$") + +#include <unistd.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <stdlib.h> +#include <sys/time.h> +#include <stdio.h> +#include <errno.h> +#include <string.h> + +#include "asterisk/lock.h" +#include "asterisk/channel.h" +#include "asterisk/file.h" +#include "asterisk/logger.h" +#include "asterisk/sched.h" +#include "asterisk/module.h" +#include "asterisk/endian.h" + +/* Some Ideas for this code came from makeh264e.c by Jeffrey Chilton */ + +/* Portions of the conversion code are by guido@sienanet.it */ +/*! \todo Check this buf size estimate, it may be totally wrong for large frame video */ + +#define BUF_SIZE 4096 /* Two Real h264 Frames */ +struct h264_desc { + unsigned int lastts; +}; + +static int h264_open(struct ast_filestream *s) +{ + unsigned int ts; + int res; + if ((res = fread(&ts, 1, sizeof(ts), s->f)) < sizeof(ts)) { + ast_log(LOG_WARNING, "Empty file!\n"); + return -1; + } + return 0; +} + +static struct ast_frame *h264_read(struct ast_filestream *s, int *whennext) +{ + int res; + int mark=0; + unsigned short len; + unsigned int ts; + struct h264_desc *fs = (struct h264_desc *)s->_private; + + /* Send a frame from the file to the appropriate channel */ + if ((res = fread(&len, 1, sizeof(len), s->f)) < 1) + return NULL; + len = ntohs(len); + mark = (len & 0x8000) ? 1 : 0; + len &= 0x7fff; + if (len > BUF_SIZE) { + ast_log(LOG_WARNING, "Length %d is too long\n", len); + len = BUF_SIZE; /* XXX truncate */ + } + s->fr.frametype = AST_FRAME_VIDEO; + s->fr.subclass = AST_FORMAT_H264; + s->fr.mallocd = 0; + AST_FRAME_SET_BUFFER(&s->fr, s->buf, AST_FRIENDLY_OFFSET, len); + if ((res = fread(s->fr.data, 1, s->fr.datalen, s->f)) != s->fr.datalen) { + if (res) + ast_log(LOG_WARNING, "Short read (%d of %d) (%s)!\n", res, len, strerror(errno)); + return NULL; + } + s->fr.samples = fs->lastts; + s->fr.datalen = len; + s->fr.subclass |= mark; + s->fr.delivery.tv_sec = 0; + s->fr.delivery.tv_usec = 0; + if ((res = fread(&ts, 1, sizeof(ts), s->f)) == sizeof(ts)) { + fs->lastts = ntohl(ts); + *whennext = fs->lastts * 4/45; + } else + *whennext = 0; + return &s->fr; +} + +static int h264_write(struct ast_filestream *s, struct ast_frame *f) +{ + int res; + unsigned int ts; + unsigned short len; + int mark; + + if (f->frametype != AST_FRAME_VIDEO) { + ast_log(LOG_WARNING, "Asked to write non-video frame!\n"); + return -1; + } + mark = (f->subclass & 0x1) ? 0x8000 : 0; + if ((f->subclass & ~0x1) != AST_FORMAT_H264) { + ast_log(LOG_WARNING, "Asked to write non-h264 frame (%d)!\n", f->subclass); + return -1; + } + ts = htonl(f->samples); + if ((res = fwrite(&ts, 1, sizeof(ts), s->f)) != sizeof(ts)) { + ast_log(LOG_WARNING, "Bad write (%d/4): %s\n", res, strerror(errno)); + return -1; + } + len = htons(f->datalen | mark); + if ((res = fwrite(&len, 1, sizeof(len), s->f)) != sizeof(len)) { + ast_log(LOG_WARNING, "Bad write (%d/2): %s\n", res, strerror(errno)); + return -1; + } + if ((res = fwrite(f->data, 1, f->datalen, s->f)) != f->datalen) { + ast_log(LOG_WARNING, "Bad write (%d/%d): %s\n", res, f->datalen, strerror(errno)); + return -1; + } + return 0; +} + +static int h264_seek(struct ast_filestream *fs, off_t sample_offset, int whence) +{ + /* No way Jose */ + return -1; +} + +static int h264_trunc(struct ast_filestream *fs) +{ + /* Truncate file to current length */ + if (ftruncate(fileno(fs->f), ftell(fs->f)) < 0) + return -1; + return 0; +} + +static off_t h264_tell(struct ast_filestream *fs) +{ + off_t offset = ftell(fs->f); + return offset; /* XXX totally bogus, needs fixing */ +} + +static const struct ast_format h264_f = { + .name = "h264", + .exts = "h264", + .format = AST_FORMAT_H264, + .open = h264_open, + .write = h264_write, + .seek = h264_seek, + .trunc = h264_trunc, + .tell = h264_tell, + .read = h264_read, + .buf_size = BUF_SIZE + AST_FRIENDLY_OFFSET, + .desc_size = sizeof(struct h264_desc), +}; + +static int load_module(void) +{ + return ast_format_register(&h264_f); +} + +static int unload_module(void) +{ + return ast_format_unregister(h264_f.name); +} + +AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Raw H.264 data"); |