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mkvtoolnix/librmff/rmff.c

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/*
rmff.c
Copyright (C) Moritz Bunkus - March 2004
librmff 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, or (at your option)
any later version.
librmff 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 Lesser General Public License
along with this library; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
$Id$
*/
#include "os.h"
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "librmff.h"
#if defined(COMP_MSC)
#define inline __inline
#endif
typedef struct rmff_video_segment_t {
uint32_t size;
uint32_t offset;
unsigned char *data;
} rmff_video_segment_t;
typedef struct rmff_bitrate_t {
uint32_t *timecodes;
uint32_t *frame_sizes;
uint32_t num_entries;
} rmff_bitrate_t;
typedef struct rmff_file_internal_t {
uint32_t max_bit_rate;
uint32_t avg_bit_rate;
uint32_t max_packet_size;
uint32_t avg_packet_size;
uint32_t highest_timecode;
uint32_t num_packets;
uint32_t data_offset;
uint32_t next_data_offset;
uint32_t data_contents_size;
uint32_t index_offset;
int num_index_chunks;
uint32_t total_bytes;
rmff_bitrate_t bitrate;
} rmff_file_internal_t;
typedef struct rmff_track_internal_t {
uint32_t max_bit_rate;
uint32_t avg_bit_rate;
uint32_t max_packet_size;
uint32_t avg_packet_size;
uint32_t highest_timecode;
uint32_t num_packets;
uint32_t num_packed_frames;
int index_this;
uint32_t total_bytes;
rmff_bitrate_t bitrate;
/* Used for video packet assembly. */
uint32_t c_timecode;
int f_merged;
int c_keyframe;
rmff_video_segment_t *segments;
int num_segments;
rmff_frame_t **assembled_frames;
int num_assembled_frames;
} rmff_track_internal_t;
int rmff_last_error = RMFF_ERR_OK;
const char *rmff_last_error_msg = NULL;
static char error_msg_buffer[1000];
static const char *rmff_std_error_messages[] = {
"No error",
"File is not a RealMedia file",
"Inconsistent data found in file",
"End of file reached",
"Input/output error",
"Invalid parameters"
};
const char *
rmff_get_error_str(int code) {
code *= -1;
if ((code >= 0) && (code <= 5))
return rmff_std_error_messages[code];
else
return "Unknown error";
}
static void
set_error(int error_number,
const char *error_msg) {
rmff_last_error = error_number;
if (error_msg == NULL)
rmff_last_error_msg = rmff_get_error_str(error_number);
else
rmff_last_error_msg = error_msg;
}
#define clear_error() set_error(RMFF_ERR_OK, NULL)
uint16_t
rmff_get_uint16_be(const void *buf) {
uint16_t ret;
unsigned char *tmp;
tmp = (unsigned char *) buf;
ret = tmp[0] & 0xff;
ret = (ret << 8) + (tmp[1] & 0xff);
return ret;
}
uint32_t
rmff_get_uint32_be(const void *buf) {
uint32_t ret;
unsigned char *tmp;
tmp = (unsigned char *) buf;
ret = tmp[0] & 0xff;
ret = (ret << 8) + (tmp[1] & 0xff);
ret = (ret << 8) + (tmp[2] & 0xff);
ret = (ret << 8) + (tmp[3] & 0xff);
return ret;
}
uint32_t
rmff_get_uint32_le(const void *buf) {
uint32_t ret;
unsigned char *tmp;
tmp = (unsigned char *) buf;
ret = tmp[3] & 0xff;
ret = (ret << 8) + (tmp[2] & 0xff);
ret = (ret << 8) + (tmp[1] & 0xff);
ret = (ret << 8) + (tmp[0] & 0xff);
return ret;
}
void
rmff_put_uint16_be(void *buf,
uint16_t value) {
unsigned char *tmp;
tmp = (unsigned char *) buf;
tmp[1] = value & 0xff;
tmp[0] = (value >>= 8) & 0xff;
}
void
rmff_put_uint32_be(void *buf,
uint32_t value) {
unsigned char *tmp;
tmp = (unsigned char *) buf;
tmp[3] = value & 0xff;
tmp[2] = (value >>= 8) & 0xff;
tmp[1] = (value >>= 8) & 0xff;
tmp[0] = (value >>= 8) & 0xff;
}
void
rmff_put_uint32_le(void *buf,
uint32_t value) {
unsigned char *tmp;
tmp = (unsigned char *) buf;
tmp[0] = value & 0xff;
tmp[1] = (value >>= 8) & 0xff;
tmp[2] = (value >>= 8) & 0xff;
tmp[3] = (value >>= 8) & 0xff;
}
#define read_uint8() file_read_uint8(io, fh)
#define read_uint16_be() file_read_uint16_be(io, fh)
#define read_uint32_be() file_read_uint32_be(io, fh)
#define read_uint16_be_to(addr) rmff_put_uint16_be(addr, read_uint16_be())
#define read_uint32_be_to(addr) rmff_put_uint32_be(addr, read_uint32_be())
#define write_uint8(v) file_write_uint8(io, fh, v)
#define write_uint16_be(v) file_write_uint16_be(io, fh, v)
#define write_uint32_be(v) file_write_uint32_be(io, fh, v)
#define write_uint16_be_from(addr) write_uint16_be(rmff_get_uint16_be(addr))
#define write_uint32_be_from(addr) write_uint32_be(rmff_get_uint32_be(addr))
#define get_fourcc(b) rmff_get_uint32_be(b)
static uint8_t
file_read_uint8(mb_file_io_t *io,
void *fh) {
unsigned char tmp;
if (io->read(fh, &tmp, 1) != 1) {
set_error(RMFF_ERR_IO, NULL);
return 0;
}
return tmp;
}
static uint16_t
file_read_uint16_be(mb_file_io_t *io,
void *fh) {
unsigned char tmp[2];
if (io->read(fh, tmp, 2) != 2) {
set_error(RMFF_ERR_IO, NULL);
return 0;
}
return rmff_get_uint16_be(tmp);
}
static uint32_t
file_read_uint32_be(mb_file_io_t *io,
void *fh) {
unsigned char tmp[4];
if (io->read(fh, tmp, 4) != 4) {
set_error(RMFF_ERR_IO, NULL);
return 0;
}
return rmff_get_uint32_be(tmp);
}
static int
file_write_uint8(mb_file_io_t *io,
void *fh,
uint8_t value) {
return io->write(fh, &value, 1);
}
static int
file_write_uint16_be(mb_file_io_t *io,
void *fh,
uint16_t value) {
unsigned char tmp[2];
rmff_put_uint16_be(tmp, value);
return io->write(fh, &tmp, 2);
}
static int
file_write_uint32_be(mb_file_io_t *io,
void *fh,
uint32_t value) {
unsigned char tmp[4];
rmff_put_uint32_be(tmp, value);
return io->write(fh, &tmp, 4);
}
void
die(const char *fmt,
...) {
va_list ap;
fprintf(stderr, "'die' called: ");
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
exit(1);
}
#define safestrdup(s) _safestrdup(s, __FILE__, __LINE__)
#define safememdup(s, b) _safememdup(s, b, __FILE__, __LINE__)
#define safemalloc(s) _safemalloc(s, __FILE__, __LINE__)
#define safecalloc(s) _safecalloc(s, __FILE__, __LINE__)
#define saferealloc(s, b) _saferealloc(s, b, __FILE__, __LINE__)
#define safefree(s) { if ((s) != NULL) free(s); }
static char *
_safestrdup(const char *s,
const char *file,
int line) {
char *copy;
if (s == NULL)
return NULL;
copy = strdup(s);
if (copy == NULL)
die("safestrdup() called from file %s, line %d: strdup() "
"returned NULL for '%s'.", file, line, s);
return copy;
}
static void *
_safememdup(const void *s,
size_t size,
const char *file,
int line) {
void *copy;
if (s == NULL)
return NULL;
copy = malloc(size);
if (copy == NULL)
die("safememdup() called from file %s, line %d: malloc() "
"returned NULL for a size of %d bytes.", file, line, size);
memcpy(copy, s, size);
return copy;
}
static void *
_safemalloc(size_t size,
const char *file,
int line) {
void *mem;
mem = malloc(size);
if (mem == NULL)
die("safemalloc() called from file %s, line %d: malloc() "
"returned NULL for a size of %d bytes.", file, line, size);
return mem;
}
static void *_safecalloc(size_t size,
const char *file,
int line) {
void *mem;
mem = calloc(size, 1);
if (mem == NULL)
die("safemalloc() called from file %s, line %d: malloc() "
"returned NULL for a size of %d bytes.", file, line, size);
return mem;
}
static void *
_saferealloc(void *mem,
size_t size,
const char *file,
int line) {
mem = realloc(mem, size);
if (mem == NULL)
die("saferealloc() called from file %s, line %d: realloc() "
"returned NULL for a size of %d bytes.", file, line, size);
return mem;
}
static rmff_file_t *
open_file_for_reading(const char *path,
mb_file_io_t *io) {
rmff_file_t *file;
void *file_h;
char signature[5];
file_h = io->open(path, MB_OPEN_MODE_READING);
if (file_h == NULL)
return NULL;
signature[4] = 0;
if ((io->read(file_h, signature, 4) != 4) ||
strcmp(signature, ".RMF")) {
io->close(file_h);
set_error(RMFF_ERR_NOT_RMFF, NULL);
return NULL;
}
file = (rmff_file_t *)safecalloc(sizeof(rmff_file_t));
file->handle = file_h;
file->name = safestrdup(path);
file->io = io;
io->seek(file_h, 0, SEEK_END);
file->size = io->tell(file_h);
io->seek(file_h, 4, SEEK_SET);
file->open_mode = RMFF_OPEN_MODE_READING;
file->internal = safecalloc(sizeof(rmff_file_internal_t));
clear_error();
return file;
}
static rmff_file_t *
open_file_for_writing(const char *path,
mb_file_io_t *io) {
rmff_file_t *file;
void *file_h;
const char *signature = ".RMF";
file_h = io->open(path, MB_OPEN_MODE_WRITING);
if (file_h == NULL)
return NULL;
if (io->write(file_h, signature, 4) != 4) {
io->close(file_h);
set_error(RMFF_ERR_IO, NULL);
return NULL;
}
file = (rmff_file_t *)safecalloc(sizeof(rmff_file_t));
file->handle = file_h;
file->name = safestrdup(path);
file->io = io;
file->size = -1;
file->open_mode = RMFF_OPEN_MODE_WRITING;
file->internal = safecalloc(sizeof(rmff_file_internal_t));
/* save allowed & perfect play */
rmff_put_uint16_be(&file->prop_header.flags,
RMFF_FILE_FLAG_SAVE_ENABLED |
RMFF_FILE_FLAG_DOWNLOAD_ENABLED);
clear_error();
return file;
}
rmff_file_t *
rmff_open_file(const char *path,
int mode) {
return rmff_open_file_with_io(path, mode, &std_mb_file_io);
}
rmff_file_t *
rmff_open_file_with_io(const char *path,
int mode,
mb_file_io_t *io) {
if ((path == NULL) || (io == NULL) ||
((mode != RMFF_OPEN_MODE_READING) && (mode != RMFF_OPEN_MODE_WRITING))) {
set_error(RMFF_ERR_PARAMETERS, NULL);
return NULL;
}
if (mode == RMFF_OPEN_MODE_READING)
return open_file_for_reading(path, io);
else
return open_file_for_writing(path, io);
}
void
rmff_free_track_data(rmff_track_t *track) {
rmff_track_internal_t *tint;
int i;
if (track == NULL)
return;
safefree(track->index);
safefree(track->mdpr_header.name);
safefree(track->mdpr_header.mime_type);
safefree(track->mdpr_header.type_specific_data);
tint = (rmff_track_internal_t *)track->internal;
for (i = 0; i < tint->num_segments; i++)
safefree(tint->segments[i].data);
safefree(tint->segments);
for (i = 0; i < tint->num_assembled_frames; i++)
rmff_release_frame(tint->assembled_frames[i]);
safefree(tint->assembled_frames);
safefree(track->internal);
}
void
rmff_close_file(rmff_file_t *file) {
int i;
if (file == NULL)
return;
safefree(file->name);
for (i = 0; i < file->num_tracks; i++) {
rmff_free_track_data(file->tracks[i]);
safefree(file->tracks[i]);
}
safefree(file->tracks);
safefree(file->cont_header.title);
safefree(file->cont_header.author);
safefree(file->cont_header.copyright);
safefree(file->cont_header.comment);
safefree(file->internal);
file->io->close(file->handle);
safefree(file);
}
#define skip(num) \
{ \
if (io->seek(fh, num, SEEK_CUR) != 0) {\
set_error(RMFF_ERR_IO, NULL); \
return -1; \
} \
}
static void
add_to_index(rmff_track_t *track,
int64_t pos,
uint32_t timecode,
uint32_t packet_number) {
if ((track->index != NULL) &&
(track->index[track->num_index_entries - 1].timecode == timecode))
return;
track->index = (rmff_index_entry_t *)
saferealloc(track->index, (track->num_index_entries + 1) *
sizeof(rmff_index_entry_t));
track->index[track->num_index_entries].pos = pos;
track->index[track->num_index_entries].timecode = timecode;
track->index[track->num_index_entries].packet_number = packet_number;
track->num_index_entries++;
}
static void
read_index(rmff_file_t *file,
int64_t pos) {
void *fh;
mb_file_io_t *io;
rmff_track_t *track;
uint32_t object_id, object_size, object_version, num_entries;
uint32_t next_header_offset, i, timecode, offset, packet_number;
uint16_t id;
fh = file->handle;
io = file->io;
rmff_last_error = RMFF_ERR_OK;
io->seek(fh, pos, SEEK_SET);
object_id = read_uint32_be();
object_size = read_uint32_be();
object_version = read_uint16_be();
if (rmff_last_error != RMFF_ERR_OK)
return;
if (object_id != rmffFOURCC('I', 'N', 'D', 'X'))
return;
num_entries = read_uint32_be();
id = read_uint16_be();
track = rmff_find_track_with_id(file, id);
if (track == NULL)
return;
next_header_offset = read_uint32_be();
track->num_index_entries = 0;
safefree(track->index);
track->index = NULL;
for (i = 0; i < num_entries; i++) {
if (read_uint16_be() != 0) /* version */
return;
timecode = read_uint32_be();
offset = read_uint32_be();
packet_number = read_uint32_be();
add_to_index(track, timecode, offset, packet_number);
}
if (next_header_offset > 0)
read_index(file, next_header_offset);
}
int
rmff_read_headers(rmff_file_t *file) {
mb_file_io_t *io;
void *fh;
uint32_t object_id, object_size, size;
uint16_t object_version;
rmff_rmf_t *rmf;
rmff_prop_t *prop;
rmff_cont_t *cont;
rmff_mdpr_t *mdpr;
rmff_track_t *track;
real_video_props_t *rvp;
real_audio_v4_props_t *ra4p;
rmff_file_internal_t *fint;
int prop_header_found;
int64_t old_pos;
if ((file == NULL) || (file->open_mode != RMFF_OPEN_MODE_READING)) {
set_error(RMFF_ERR_PARAMETERS, NULL);
return RMFF_ERR_PARAMETERS;
}
if (file->headers_read)
return 0;
io = file->io;
fh = file->handle;
fint = (rmff_file_internal_t *)file->internal;
if (io->seek(fh, 0, SEEK_SET)) {
set_error(RMFF_ERR_IO, NULL);
return RMFF_ERR_IO;
}
rmf = &file->rmf_header;
rmff_last_error = RMFF_ERR_OK;
read_uint32_be_to(&rmf->obj.id);
read_uint32_be_to(&rmf->obj.size);
read_uint16_be_to(&rmf->obj.version);
read_uint32_be_to(&rmf->format_version);
read_uint32_be_to(&rmf->num_headers);
if (rmff_last_error != RMFF_ERR_OK)
return rmff_last_error;
prop = &file->prop_header;
prop_header_found = 0;
cont = &file->cont_header;
while (1) {
rmff_last_error = RMFF_ERR_OK;
object_id = read_uint32_be();
object_size = read_uint32_be();
object_version = read_uint16_be();
if (rmff_last_error != RMFF_ERR_OK)
break;
if (object_id == rmffFOURCC('P', 'R', 'O', 'P')) {
rmff_put_uint32_be(&prop->obj.id, object_id);
rmff_put_uint32_be(&prop->obj.size, object_size);
rmff_put_uint16_be(&prop->obj.version, object_version);
read_uint32_be_to(&prop->max_bit_rate);
read_uint32_be_to(&prop->avg_bit_rate);
read_uint32_be_to(&prop->max_packet_size);
read_uint32_be_to(&prop->avg_packet_size);
read_uint32_be_to(&prop->num_packets);
read_uint32_be_to(&prop->duration);
read_uint32_be_to(&prop->preroll);
read_uint32_be_to(&prop->index_offset);
read_uint32_be_to(&prop->data_offset);
read_uint16_be_to(&prop->num_streams);
read_uint16_be_to(&prop->flags);
prop_header_found = 1;
} else if (object_id == rmffFOURCC('C', 'O', 'N', 'T')) {
if (file->cont_header_present) {
safefree(cont->title);
safefree(cont->author);
safefree(cont->copyright);
safefree(cont->comment);
}
memset(cont, 0, sizeof(rmff_cont_t));
rmff_put_uint32_be(&cont->obj.id, object_id);
rmff_put_uint32_be(&cont->obj.size, object_size);
rmff_put_uint16_be(&cont->obj.version, object_version);
size = read_uint16_be(); /* title_len */
if (size > 0) {
cont->title = (char *)safecalloc(size + 1);
io->read(fh, cont->title, size);
}
size = read_uint16_be(); /* author_len */
if (size > 0) {
cont->author = (char *)safecalloc(size + 1);
io->read(fh, cont->author, size);
}
size = read_uint16_be(); /* copyright_len */
if (size > 0) {
cont->copyright = (char *)safecalloc(size + 1);
io->read(fh, cont->copyright, size);
}
size = read_uint16_be(); /* comment_len */
if (size > 0) {
cont->comment = (char *)safecalloc(size + 1);
io->read(fh, cont->comment, size);
}
file->cont_header_present = 1;
} else if (object_id == rmffFOURCC('M', 'D', 'P', 'R')) {
track = (rmff_track_t *)safecalloc(sizeof(rmff_track_t));
track->file = (struct rmff_file_t *)file;
mdpr = &track->mdpr_header;
rmff_put_uint32_be(&mdpr->obj.id, object_id);
rmff_put_uint32_be(&mdpr->obj.size, object_size);
rmff_put_uint16_be(&mdpr->obj.version, object_version);
read_uint16_be_to(&mdpr->id);
track->id = rmff_get_uint16_be(&mdpr->id);
read_uint32_be_to(&mdpr->max_bit_rate);
read_uint32_be_to(&mdpr->avg_bit_rate);
read_uint32_be_to(&mdpr->max_packet_size);
read_uint32_be_to(&mdpr->avg_packet_size);
read_uint32_be_to(&mdpr->start_time);
read_uint32_be_to(&mdpr->preroll);
read_uint32_be_to(&mdpr->duration);
size = read_uint8(); /* stream_name_len */
if (size > 0) {
mdpr->name = (char *)safemalloc(size + 1);
io->read(fh, mdpr->name, size);
mdpr->name[size] = 0;
}
size = read_uint8(); /* mime_type_len */
if (size > 0) {
mdpr->mime_type = (char *)safemalloc(size + 1);
io->read(fh, mdpr->mime_type, size);
mdpr->mime_type[size] = 0;
}
size = read_uint32_be(); /* type_specific_size */
rmff_put_uint32_be(&mdpr->type_specific_size, size);
if (size > 0) {
mdpr->type_specific_data = (unsigned char *)safemalloc(size);
io->read(fh, mdpr->type_specific_data, size);
}
rvp = (real_video_props_t *)mdpr->type_specific_data;
ra4p = (real_audio_v4_props_t *)mdpr->type_specific_data;
if ((size >= sizeof(real_video_props_t)) &&
(get_fourcc(&rvp->fourcc1) == rmffFOURCC('V', 'I', 'D', 'O')))
track->type = RMFF_TRACK_TYPE_VIDEO;
else if ((size >= sizeof(real_audio_v4_props_t)) &&
(get_fourcc(&ra4p->fourcc1) ==
rmffFOURCC('.', 'r', 'a', 0xfd))) {
track->type = RMFF_TRACK_TYPE_AUDIO;
if ((rmff_get_uint16_be(&ra4p->version1) == 5) &&
(size < sizeof(real_audio_v5_props_t))) {
set_error(RMFF_ERR_DATA, "RealAudio v5 data indicated but "
"data too small");
return RMFF_ERR_DATA;
}
}
track->internal = safecalloc(sizeof(rmff_track_internal_t));
file->tracks =
(rmff_track_t **)saferealloc(file->tracks, (file->num_tracks + 1) *
sizeof(rmff_track_t *));
file->tracks[file->num_tracks] = track;
file->num_tracks++;
} else if (object_id == rmffFOURCC('D', 'A', 'T', 'A')) {
fint->data_offset = io->tell(fh) - (4 + 4 + 2);
file->num_packets_in_chunk = read_uint32_be();
fint->next_data_offset = read_uint32_be();
break;
} else {
/* Unknown header type */
set_error(RMFF_ERR_DATA, NULL);
return RMFF_ERR_DATA;
}
}
if (prop_header_found && (fint->data_offset > 0)) {
if (rmff_get_uint32_be(&file->prop_header.index_offset) > 0) {
old_pos = io->tell(fh);
read_index(file, rmff_get_uint32_be(&file->prop_header.index_offset));
io->seek(fh, old_pos, SEEK_SET);
}
file->headers_read = 1;
return 0;
}
set_error(RMFF_ERR_DATA, NULL);
return RMFF_ERR_DATA;
}
int
rmff_get_next_frame_size(rmff_file_t *file) {
uint16_t object_version, length;
uint32_t object_id;
mb_file_io_t *io;
void *fh;
int result;
int64_t old_pos;
if ((file == NULL) || (!file->headers_read) || (file->io == NULL) ||
(file->handle == NULL) || (file->open_mode != RMFF_OPEN_MODE_READING)) {
set_error(RMFF_ERR_PARAMETERS, NULL);
return RMFF_ERR_PARAMETERS;
}
io = file->io;
fh = file->handle;
old_pos = io->tell(fh);
if ((file->size - old_pos) < 12) {
set_error(RMFF_ERR_EOF, NULL);
return RMFF_ERR_EOF;
}
object_version = read_uint16_be();
length = read_uint16_be();
object_id = ((uint32_t)object_version) << 16 | length;
if (object_id == rmffFOURCC('D', 'A', 'T', 'A')) {
skip(4 + 4); /* packets_in_chunk, next_data_header */
result = rmff_get_next_frame_size(file);
io->seek(fh, old_pos, SEEK_SET);
return result;
}
io->seek(fh, old_pos, SEEK_SET);
if (object_id == rmffFOURCC('I', 'N', 'D', 'X')) {
set_error(RMFF_ERR_EOF, NULL);
return RMFF_ERR_EOF;
}
return length - 12;
}
rmff_frame_t *
rmff_read_next_frame(rmff_file_t *file,
void *buffer) {
rmff_frame_t *frame;
rmff_file_internal_t *fint;
uint16_t object_version, length;
uint32_t object_id;
mb_file_io_t *io;
void *fh;
if ((file == NULL) || (!file->headers_read) || (file->io == NULL) ||
(file->handle == NULL) || (file->open_mode != RMFF_OPEN_MODE_READING)) {
set_error(RMFF_ERR_PARAMETERS, NULL);
return NULL;
}
io = file->io;
fh = file->handle;
fint = (rmff_file_internal_t *)file->internal;
if ((file->size - io->tell(fh)) < 12) {
set_error(RMFF_ERR_EOF, NULL);
return NULL;
}
object_version = read_uint16_be();
length = read_uint16_be();
object_id = ((uint32_t)object_version) << 16 | length;
if (object_id == rmffFOURCC('D', 'A', 'T', 'A')) {
file->num_packets_in_chunk = read_uint32_be();
fint->next_data_offset = read_uint32_be();
file->num_packets_read = 0;
return rmff_read_next_frame(file, buffer);
}
if ((file->num_packets_read >= file->num_packets_in_chunk) ||
(object_id == rmffFOURCC('I', 'N', 'D', 'X'))) {
set_error(RMFF_ERR_EOF, NULL);
return NULL;
}
frame = (rmff_frame_t *)safecalloc(sizeof(rmff_frame_t));
if (buffer == NULL) {
buffer = safemalloc(length);
frame->allocated_by_rmff = 1;
}
frame->data = (unsigned char *)buffer;
frame->size = length - 12;
frame->id = read_uint16_be();
frame->timecode = read_uint32_be();
frame->reserved = read_uint8();
frame->flags = read_uint8();
if (io->read(fh, frame->data, frame->size) != frame->size) {
rmff_release_frame(frame);
set_error(RMFF_ERR_EOF, NULL);
return NULL;
}
file->num_packets_read++;
return frame;
}
rmff_frame_t *
rmff_allocate_frame(uint32_t size,
void *buffer) {
rmff_frame_t *frame;
if (size == 0) {
set_error(RMFF_ERR_PARAMETERS, NULL);
return NULL;
}
frame = (rmff_frame_t *)safecalloc(sizeof(rmff_frame_t));
if (buffer == NULL) {
buffer = safemalloc(size);
frame->allocated_by_rmff = 1;
}
frame->size = size;
frame->data = (unsigned char *)buffer;
return frame;
}
void
rmff_release_frame(rmff_frame_t *frame) {
if (frame == NULL)
return;
if (frame->allocated_by_rmff)
safefree(frame->data);
safefree(frame);
}
void
rmff_set_cont_header(rmff_file_t *file,
const char *title,
const char *author,
const char *copyright,
const char *comment) {
if (file == NULL)
return;
safefree(file->cont_header.title);
safefree(file->cont_header.author);
safefree(file->cont_header.copyright);
safefree(file->cont_header.comment);
file->cont_header.title = safestrdup(title);
file->cont_header.author = safestrdup(author);
file->cont_header.copyright = safestrdup(copyright);
file->cont_header.comment = safestrdup(comment);
}
void
rmff_set_track_data(rmff_track_t *track,
const char *name,
const char *mime_type) {
if (track == NULL)
return;
if (name != track->mdpr_header.name) {
safefree(track->mdpr_header.name);
track->mdpr_header.name = safestrdup(name);
}
if (mime_type != track->mdpr_header.mime_type) {
safefree(track->mdpr_header.mime_type);
track->mdpr_header.mime_type = safestrdup(mime_type);
}
}
void
rmff_set_type_specific_data(rmff_track_t *track,
const unsigned char *data,
uint32_t size) {
if (track == NULL)
return;
if (data != track->mdpr_header.type_specific_data) {
safefree(track->mdpr_header.type_specific_data);
track->mdpr_header.type_specific_data =
(unsigned char *)safememdup(data, size);
rmff_put_uint32_be(&track->mdpr_header.type_specific_size, size);
}
}
rmff_track_t *
rmff_add_track(rmff_file_t *file,
int create_index) {
rmff_track_t *track;
rmff_track_internal_t *tint;
int i, id, found;
if ((file == NULL) || (file->open_mode != RMFF_OPEN_MODE_WRITING)) {
set_error(RMFF_ERR_PARAMETERS, NULL);
return NULL;
}
id = 0;
do {
found = 0;
for (i = 0; i < file->num_tracks; i++)
if (file->tracks[i]->id == id) {
found = 1;
id++;
break;
}
} while (found);
track = (rmff_track_t *)safecalloc(sizeof(rmff_track_t));
track->id = id;
track->file = file;
tint = (rmff_track_internal_t *)safecalloc(sizeof(rmff_track_internal_t));
tint->index_this = create_index;
track->internal = tint;
file->tracks =
(rmff_track_t **)saferealloc(file->tracks, (file->num_tracks + 1) *
sizeof(rmff_track_t *));
file->tracks[file->num_tracks] = track;
file->num_tracks++;
return track;
}
void
rmff_set_std_audio_v4_values(real_audio_v4_props_t *props) {
if (props == NULL)
return;
memset(props, 0, sizeof(real_audio_v4_props_t));
rmff_put_uint32_be(&props->fourcc1, rmffFOURCC('.', 'r', 'a', 0xfd));
rmff_put_uint16_be(&props->version1, 4);
rmff_put_uint32_be(&props->fourcc2, rmffFOURCC('.', 'r', 'a', '4'));
rmff_put_uint32_be(&props->stream_length, 0x10000000);
rmff_put_uint16_be(&props->version2, 4);
rmff_put_uint16_be(&props->header_size, 0x4e);
}
void
rmff_set_std_audio_v5_values(real_audio_v5_props_t *props) {
}
void
rmff_set_std_video_values(real_video_props_t *props) {
}
static int
write_prop_header(rmff_file_t *file) {
void *fh;
mb_file_io_t *io;
int bw;
io = file->io;
fh = file->handle;
/* Write the PROP header. */
bw = write_uint32_be(rmffFOURCC('P', 'R', 'O', 'P'));
bw += write_uint32_be(0x32); /* object_size */
bw += write_uint16_be(0); /* object_version */
bw += write_uint32_be_from(&file->prop_header.max_bit_rate);
bw += write_uint32_be_from(&file->prop_header.avg_bit_rate);
bw += write_uint32_be_from(&file->prop_header.max_packet_size);
bw += write_uint32_be_from(&file->prop_header.avg_packet_size);
bw += write_uint32_be_from(&file->prop_header.num_packets);
bw += write_uint32_be_from(&file->prop_header.duration);
bw += write_uint32_be_from(&file->prop_header.preroll);
bw += write_uint32_be_from(&file->prop_header.index_offset);
bw += write_uint32_be_from(&file->prop_header.data_offset);
bw += write_uint16_be_from(&file->prop_header.num_streams);
bw += write_uint16_be_from(&file->prop_header.flags);
return bw;
}
static int
write_cont_header(rmff_file_t *file) {
void *fh;
mb_file_io_t *io;
int bw, wanted_len, title_len, author_len, copyright_len, comment_len;
io = file->io;
fh = file->handle;
if (file->cont_header.title == NULL)
title_len = 0;
else
title_len = strlen(file->cont_header.title);
if (file->cont_header.author == NULL)
author_len = 0;
else
author_len = strlen(file->cont_header.author);
if (file->cont_header.copyright == NULL)
copyright_len = 0;
else
copyright_len = strlen(file->cont_header.copyright);
if (file->cont_header.comment == NULL)
comment_len = 0;
else
comment_len = strlen(file->cont_header.comment);
wanted_len = 4 + 4 + 2 + 4 * 2 + title_len + author_len + copyright_len +
comment_len;
/* Write the CONT header. */
bw = write_uint32_be(rmffFOURCC('C', 'O', 'N', 'T'));
bw += write_uint32_be(wanted_len); /* object_size */
bw += write_uint16_be(0); /* object_version */
bw += write_uint16_be(title_len);
if (file->cont_header.title != NULL)
bw += io->write(fh, file->cont_header.title, title_len);
bw += write_uint16_be(author_len);
if (file->cont_header.author != NULL)
bw += io->write(fh, file->cont_header.author, author_len);
bw += write_uint16_be(copyright_len);
if (file->cont_header.copyright != NULL)
bw += io->write(fh, file->cont_header.copyright, copyright_len);
bw += write_uint16_be(comment_len);
if (file->cont_header.comment != NULL)
bw += io->write(fh, file->cont_header.comment, comment_len);
if (bw == wanted_len)
return 0;
set_error(RMFF_ERR_IO, "Could not write the CONT header");
return RMFF_ERR_IO;
}
static int
write_mdpr_header(rmff_track_t *track) {
void *fh;
mb_file_io_t *io;
int bw, wanted_len, name_len, mime_type_len;
io = track->file->io;
fh = track->file->handle;
rmff_put_uint16_be(&track->mdpr_header.id, track->id);
if (track->mdpr_header.name == NULL)
name_len = 0;
else
name_len = strlen(track->mdpr_header.name);
if (track->mdpr_header.mime_type == NULL)
mime_type_len = 0;
else
mime_type_len = strlen(track->mdpr_header.mime_type);
wanted_len = 4 + 4 + 2 + 2 + 7 * 4 + 1 + name_len + 1 + mime_type_len +
4 + rmff_get_uint32_be(&track->mdpr_header.type_specific_size);
/* Write the MDPR header. */
bw = write_uint32_be(rmffFOURCC('M', 'D', 'P', 'R'));
bw += write_uint32_be(wanted_len); /* object_size */
bw += write_uint16_be(0); /* object_version */
bw += write_uint16_be_from(&track->mdpr_header.id);
bw += write_uint32_be_from(&track->mdpr_header.max_bit_rate);
bw += write_uint32_be_from(&track->mdpr_header.avg_bit_rate);
bw += write_uint32_be_from(&track->mdpr_header.max_packet_size);
bw += write_uint32_be_from(&track->mdpr_header.avg_packet_size);
bw += write_uint32_be_from(&track->mdpr_header.start_time);
bw += write_uint32_be_from(&track->mdpr_header.preroll);
bw += write_uint32_be_from(&track->mdpr_header.duration);
bw += write_uint8(name_len);
if (track->mdpr_header.name != NULL)
bw += io->write(fh, track->mdpr_header.name, name_len);
bw += write_uint8(mime_type_len);
if (track->mdpr_header.mime_type != NULL)
bw += io->write(fh, track->mdpr_header.mime_type, mime_type_len);
bw += write_uint32_be_from(&track->mdpr_header.type_specific_size);
if (track->mdpr_header.type_specific_data != NULL)
bw +=
io->write(fh, track->mdpr_header.type_specific_data,
rmff_get_uint32_be(&track->mdpr_header.type_specific_size));
if (wanted_len != bw) {
set_error(RMFF_ERR_IO, "Could not write the MDPR header");
return RMFF_ERR_IO;
}
clear_error();
return RMFF_ERR_OK;
}
static int
write_data_header(rmff_file_t *file) {
void *fh;
mb_file_io_t *io;
rmff_file_internal_t *fint;
int bw;
io = file->io;
fh = file->handle;
fint = (rmff_file_internal_t *)file->internal;
bw = write_uint32_be(rmffFOURCC('D', 'A', 'T', 'A'));
bw += write_uint32_be(fint->data_contents_size + 4 + 4 + 2 + 4 + 4);
bw += write_uint16_be(0); /* object_version */
bw += write_uint32_be(fint->num_packets); /* num_packets_in_chunk */
bw += write_uint32_be(0); /* next_data_header_offset */
if (bw != 18) {
set_error(RMFF_ERR_IO, "Could not write the DATA header");
return RMFF_ERR_IO;
}
clear_error();
return RMFF_ERR_OK;
}
int
rmff_write_headers(rmff_file_t *file) {
void *fh;
mb_file_io_t *io;
int i, bw, num_headers;
rmff_file_internal_t *fint;
const char *signature = ".RMF";
if ((file == NULL) || (file->open_mode != RMFF_OPEN_MODE_WRITING)) {
set_error(RMFF_ERR_PARAMETERS, NULL);
return RMFF_ERR_PARAMETERS;
}
io = file->io;
fh = file->handle;
io->seek(fh, 0, SEEK_SET);
fint = (rmff_file_internal_t *)file->internal;
num_headers = 1 + /* PROP */
1 + /* DATA */
file->num_tracks + /* MDPR */
fint->num_index_chunks; /* INDX */
if (file->cont_header_present)
num_headers++;
/* Write the file header. */
bw = io->write(fh, signature, 4);
bw += write_uint32_be(0x12); /* header_size */
bw += write_uint16_be(0); /* object_version */
bw += write_uint32_be(0); /* file_version */
bw += write_uint32_be(num_headers);
if (bw != 18) {
set_error(RMFF_ERR_IO, "Could not write the file header");
return RMFF_ERR_IO;
}
bw = write_prop_header(file);
if (bw != 0x32) {
set_error(RMFF_ERR_IO, "Could not write the PROP header");
return RMFF_ERR_IO;
}
if (file->cont_header_present) {
bw = write_cont_header(file);
if (bw != RMFF_ERR_OK)
return bw;
}
for (i = 0; i < file->num_tracks; i++) {
bw = write_mdpr_header(file->tracks[i]);
if (bw < RMFF_ERR_OK)
return bw;
}
fint->data_offset = io->tell(fh);
bw = write_data_header(file);
if (bw < RMFF_ERR_OK)
return bw;
clear_error();
return RMFF_ERR_OK;
}
int
rmff_fix_headers(rmff_file_t *file) {
rmff_prop_t *prop;
rmff_mdpr_t *mdpr;
rmff_track_t *track;
rmff_file_internal_t *fint;
rmff_track_internal_t *tint;
int i;
if ((file == NULL) || (file->open_mode != RMFF_OPEN_MODE_WRITING)) {
set_error(RMFF_ERR_PARAMETERS, NULL);
return RMFF_ERR_PARAMETERS;
}
fint = (rmff_file_internal_t *)file->internal;
if (fint->highest_timecode > 0)
fint->avg_bit_rate = (int64_t)fint->total_bytes * 8 * 1000 /
fint->highest_timecode;
prop = &file->prop_header;
rmff_put_uint32_be(&prop->max_bit_rate, fint->max_bit_rate);
rmff_put_uint32_be(&prop->avg_bit_rate, fint->avg_bit_rate);
rmff_put_uint32_be(&prop->max_packet_size, fint->max_packet_size);
rmff_put_uint32_be(&prop->avg_packet_size, fint->avg_packet_size);
rmff_put_uint32_be(&prop->num_packets, fint->num_packets);
rmff_put_uint32_be(&prop->duration, fint->highest_timecode);
rmff_put_uint32_be(&prop->index_offset, fint->index_offset);
rmff_put_uint32_be(&prop->data_offset, fint->data_offset);
rmff_put_uint16_be(&prop->num_streams, file->num_tracks);
for (i = 0; i < file->num_tracks; i++) {
track = file->tracks[i];
mdpr = &track->mdpr_header;
tint = (rmff_track_internal_t *)track->internal;
if (tint->highest_timecode > 0)
tint->avg_bit_rate = (int64_t)tint->total_bytes * 8 * 1000 /
tint->highest_timecode;
rmff_put_uint16_be(&mdpr->id, track->id);
rmff_put_uint32_be(&mdpr->max_bit_rate, tint->max_bit_rate);
rmff_put_uint32_be(&mdpr->avg_bit_rate, tint->avg_bit_rate);
rmff_put_uint32_be(&mdpr->max_packet_size, tint->max_packet_size);
rmff_put_uint32_be(&mdpr->avg_packet_size, tint->avg_packet_size);
rmff_put_uint32_be(&mdpr->duration, tint->highest_timecode);
}
return rmff_write_headers(file);
}
void
rmff_copy_track_headers(rmff_track_t *dst,
rmff_track_t *src) {
if ((dst == NULL) || (src == NULL))
return;
safefree(dst->mdpr_header.name);
safefree(dst->mdpr_header.mime_type);
safefree(dst->mdpr_header.type_specific_data);
memcpy(&dst->mdpr_header, &src->mdpr_header, sizeof(rmff_mdpr_t));
dst->mdpr_header.name = safestrdup(src->mdpr_header.name);
dst->mdpr_header.mime_type = safestrdup(src->mdpr_header.mime_type);
dst->mdpr_header.type_specific_data = (unsigned char *)
safememdup(src->mdpr_header.type_specific_data,
rmff_get_uint32_be(&src->mdpr_header.type_specific_size));
dst->type = src->type;
}
static uint32_t
rmff_update_max_bitrate(rmff_bitrate_t *bitrate,
uint32_t timecode,
uint32_t frame_size) {
uint32_t i, max_bit_rate, total_size;
bitrate->timecodes = (uint32_t *)saferealloc(bitrate->timecodes,
(bitrate->num_entries + 1) *
sizeof(uint32_t));
bitrate->timecodes[bitrate->num_entries] = timecode;
bitrate->frame_sizes = (uint32_t *)saferealloc(bitrate->frame_sizes,
(bitrate->num_entries + 1) *
sizeof(uint32_t));
bitrate->frame_sizes[bitrate->num_entries] = frame_size;
bitrate->num_entries++;
if ((bitrate->timecodes[bitrate->num_entries - 1] -
bitrate->timecodes[0]) < 1000)
return 0;
total_size = 0;
for (i = 0; i < bitrate->num_entries; i++)
total_size += bitrate->frame_sizes[i];
max_bit_rate = (uint32_t)
((int64_t)total_size * 8 * 1000 /
(bitrate->timecodes[bitrate->num_entries - 1] -
bitrate->timecodes[0]));
i = 0;
while ((i < bitrate->num_entries) &&
((bitrate->timecodes[bitrate->num_entries - 1] -
bitrate->timecodes[i]) >= 1000))
i++;
memmove(&bitrate->timecodes[0], &bitrate->timecodes[i],
(bitrate->num_entries - i) * sizeof(uint32_t));
bitrate->timecodes = (uint32_t *)saferealloc(bitrate->timecodes,
(bitrate->num_entries - i) *
sizeof(uint32_t));
memmove(&bitrate->frame_sizes[0], &bitrate->frame_sizes[i],
(bitrate->num_entries - i) * sizeof(uint32_t));
bitrate->frame_sizes = (uint32_t *)saferealloc(bitrate->frame_sizes,
(bitrate->num_entries - i) *
sizeof(uint32_t));
bitrate->num_entries -= i;
return max_bit_rate;
}
int
rmff_write_frame(rmff_track_t *track,
rmff_frame_t *frame) {
void *fh;
mb_file_io_t *io;
rmff_file_internal_t *fint;
rmff_track_internal_t *tint;
int bw, wanted_len;
uint32_t bit_rate;
int64_t pos;
if ((track == NULL) || (frame == NULL) || (frame->data == NULL) ||
(track->file->open_mode != RMFF_OPEN_MODE_WRITING)) {
set_error(RMFF_ERR_PARAMETERS, NULL);
return RMFF_ERR_PARAMETERS;
}
io = track->file->io;
fh = track->file->handle;
fint = (rmff_file_internal_t *)track->file->internal;
tint = (rmff_track_internal_t *)track->internal;
pos = io->tell(fh);
if (tint->index_this && ((frame->flags & 2) == 2))
add_to_index(track, pos, frame->timecode, fint->num_packets);
wanted_len = 2 + 2 + 2 + 4 + 1 + 1 + frame->size;
bw = write_uint16_be(0); /* object_version */
bw += write_uint16_be(wanted_len);
bw += write_uint16_be(track->id);
bw += write_uint32_be(frame->timecode);
bw += write_uint8(0); /* reserved */
bw += write_uint8(frame->flags);
bw += io->write(fh, frame->data, frame->size);
if (bw != wanted_len) {
set_error(RMFF_ERR_IO, "Could not write the frame");
return RMFF_ERR_IO;
}
if (frame->size > fint->max_packet_size)
fint->max_packet_size = frame->size;
fint->avg_packet_size = (fint->avg_packet_size * fint->num_packets +
frame->size) / (fint->num_packets + 1);
fint->num_packets++;
fint->total_bytes += frame->size;
if (frame->timecode > fint->highest_timecode)
fint->highest_timecode = frame->timecode;
fint->data_contents_size += wanted_len;
if (frame->size > tint->max_packet_size)
tint->max_packet_size = frame->size;
tint->avg_packet_size = (tint->avg_packet_size * tint->num_packets +
frame->size) / (tint->num_packets + 1);
tint->num_packets++;
tint->total_bytes += frame->size;
if (frame->timecode > tint->highest_timecode)
tint->highest_timecode = frame->timecode;
bit_rate = rmff_update_max_bitrate(&fint->bitrate, frame->timecode,
frame->size);
if (bit_rate > fint->max_bit_rate)
fint->max_bit_rate = bit_rate;
bit_rate = rmff_update_max_bitrate(&tint->bitrate, frame->timecode,
frame->size);
if (bit_rate > tint->max_bit_rate)
tint->max_bit_rate = bit_rate;
clear_error();
return RMFF_ERR_OK;
}
rmff_track_t *
rmff_find_track_with_id(rmff_file_t *file,
uint16_t id) {
int i;
clear_error();
if (file == 0) {
set_error(RMFF_ERR_PARAMETERS, NULL);
return NULL;
}
for (i = 0; i < file->num_tracks; i++)
if (file->tracks[i]->id == id)
return file->tracks[i];
return NULL;
}
int
rmff_write_index(rmff_file_t *file) {
void *fh;
mb_file_io_t *io;
rmff_file_internal_t *fint;
rmff_track_internal_t *tint;
rmff_track_t *track;
int i, j, bw, wanted_len;
int64_t pos;
if ((file == NULL) || (file->open_mode != RMFF_OPEN_MODE_WRITING)) {
set_error(RMFF_ERR_PARAMETERS, NULL);
return RMFF_ERR_PARAMETERS;
}
fh = file->handle;
io = file->io;
fint = (rmff_file_internal_t *)file->internal;
fint->num_index_chunks = 0;
for (i = 0; i < file->num_tracks; i++)
if (file->tracks[i]->num_index_entries > 0)
fint->num_index_chunks++;
if (fint->num_index_chunks == 0) {
clear_error();
return RMFF_ERR_OK;
}
io->seek(fh, 0, SEEK_END);
for (i = 0; i < file->num_tracks; i++) {
track = file->tracks[i];
tint = (rmff_track_internal_t *)track->internal;
if (track->num_index_entries > 0) {
pos = io->tell(fh);
if (fint->index_offset == 0)
fint->index_offset = pos;
wanted_len = 4 + 4 + 2 + /* normal chunk header */
4 + /* num_entries */
2 + /* track_id */
4 + /* next_header_pos */
(2 + /* version */
4 + /* timecode */
4 + /* offset */
4) * /* packet_number */
track->num_index_entries;
bw = write_uint32_be(rmffFOURCC('I', 'N', 'D', 'X'));
bw += write_uint32_be(wanted_len);
bw += write_uint16_be(0); /* object_version */
bw += write_uint32_be(track->num_index_entries);
bw += write_uint16_be(track->id);
if ((i + 1) < fint->num_index_chunks)
bw += write_uint32_be(pos + wanted_len); /* next_indx_offset */
else
bw += write_uint32_be(0); /* no next_indx_chunk */
for (j = 0; j < track->num_index_entries; j++) {
bw += write_uint16_be(0); /* version */
bw += write_uint32_be(track->index[j].timecode);
bw += write_uint32_be(track->index[j].pos);
bw += write_uint32_be(track->index[j].packet_number);
}
if (bw != wanted_len) {
set_error(RMFF_ERR_IO, "Could not write the INDX chunk");
return RMFF_ERR_IO;
}
}
}
clear_error();
return RMFF_ERR_OK;
}
int
rmff_write_packed_video_frame(rmff_track_t *track,
rmff_frame_t *frame) {
unsigned char *src_ptr, *ptr, *dst;
int num_subpackets, i, offset, total_len;
uint32_t *offsets, *lengths;
rmff_frame_t *spframe;
rmff_track_internal_t *tint;
if ((track == NULL) || (frame == NULL) ||
(track->file == NULL) ||
(track->file->open_mode != RMFF_OPEN_MODE_WRITING)) {
set_error(RMFF_ERR_PARAMETERS, NULL);
return RMFF_ERR_PARAMETERS;
}
tint = (rmff_track_internal_t *)track->internal;
src_ptr = frame->data;
num_subpackets = *src_ptr + 1;
src_ptr++;
if (frame->size < (num_subpackets * 8 + 1)) {
set_error(RMFF_ERR_DATA, "RealVideo unpacking failed: frame size "
"too small. Could not extract sub packet offsets.");
return RMFF_ERR_DATA;
}
offsets = (uint32_t *)safemalloc(num_subpackets * sizeof(uint32_t));
for (i = 0; i < num_subpackets; i++) {
src_ptr += 4;
offsets[i] = rmff_get_uint32_le(src_ptr);
src_ptr += 4;
}
if ((offsets[num_subpackets - 1] + (src_ptr - frame->data)) >= frame->size) {
safefree(offsets);
set_error(RMFF_ERR_DATA, "RealVideo unpacking failed: frame size "
"too small. The sub packet offsets indicate a size "
"larger than the actual size.");
return RMFF_ERR_DATA;
}
total_len = frame->size - (src_ptr - frame->data);
lengths = (uint32_t *)safemalloc(num_subpackets * sizeof(uint32_t));
for (i = 0; i < (num_subpackets - 1); i++)
lengths[i] = offsets[i + 1] - offsets[i];
lengths[num_subpackets - 1] = total_len - offsets[num_subpackets - 1];
dst = (unsigned char *)safemalloc(frame->size * 2);
for (i = 0; i < num_subpackets; i++) {
ptr = dst;
if (num_subpackets == 1) {
/* BROKEN! */
*ptr = 0xc0; /* complete frame */
ptr++;
} else {
*ptr = (num_subpackets >> 1) & 0x7f; /* number of subpackets */
if (i == (num_subpackets - 1)) /* last fragment? */
*ptr |= 0x80;
ptr++;
*ptr = i + 1; /* fragment number */
*ptr |= ((num_subpackets & 0x01) << 7); /* number of subpackets */
ptr++;
}
/* total packet length: */
if (total_len > 0x3fff) {
rmff_put_uint16_be(ptr, ((total_len & 0x3fff0000) >> 16));
ptr += 2;
rmff_put_uint16_be(ptr, total_len & 0x0000ffff);
} else
rmff_put_uint16_be(ptr, 0x4000 | total_len);
ptr += 2;
/* fragment offset from beginning/end: */
if (num_subpackets == 1)
offset = frame->timecode;
else if (i < (num_subpackets - 1))
offset = offsets[i];
else
/* If it's the last packet then the 'offset' is the fragment's length. */
offset = lengths[i];
if (offset > 0x3fff) {
rmff_put_uint16_be(ptr, ((offset & 0x3fff0000) >> 16));
ptr += 2;
rmff_put_uint16_be(ptr, offset & 0x0000ffff);
} else
rmff_put_uint16_be(ptr, 0x4000 | offset);
ptr += 2;
/* sequence number = frame number & 0xff */
*ptr = tint->num_packed_frames & 0xff;
ptr++;
memcpy(ptr, src_ptr, lengths[i]);
src_ptr += lengths[i];
ptr += lengths[i];
spframe = rmff_allocate_frame(ptr - dst, dst);
if (spframe == NULL) {
safefree(offsets);
safefree(lengths);
safefree(dst);
set_error(RMFF_ERR_IO, "Memory allocation error: Could not get a "
"rmff_frame_t");
return RMFF_ERR_IO;
}
spframe->timecode = frame->timecode;
spframe->flags = frame->flags;
if (rmff_write_frame(track, spframe) != RMFF_ERR_OK) {
safefree(offsets);
safefree(lengths);
safefree(dst);
return rmff_last_error;
}
rmff_release_frame(spframe);
}
safefree(offsets);
safefree(lengths);
safefree(dst);
tint->num_packed_frames++;
clear_error();
return RMFF_ERR_OK;
}
inline uint16_t
data_get_uint16_be(unsigned char **data,
int *len) {
(*data) += 2;
(*len) -= 2;
return rmff_get_uint16_be((*data) - 2);
}
inline unsigned char
data_get_uint8(unsigned char **data,
int *len) {
(*data)++;
(*len)--;
return *((*data) - 1);
}
static int
deliver_segments(rmff_track_t *track,
uint32_t timecode) {
uint32_t len, total;
int i;
unsigned char *buffer, *ptr;
rmff_video_segment_t *segment;
rmff_track_internal_t *tint;
rmff_frame_t *frame;
tint = (rmff_track_internal_t *)track->internal;
if (tint->num_segments == 0)
return tint->num_assembled_frames;
len = 0;
total = 0;
for (i = 0; i < tint->num_segments; i++) {
segment = &tint->segments[i];
if (len < (segment->offset + segment->size))
len = segment->offset + segment->size;
total += segment->size;
}
if (len != total) {
sprintf(error_msg_buffer, "Packet assembly failed. "
"Expected packet length was %d but found only %d sub packets "
"containing %d bytes.", len, tint->num_segments, total);
set_error(RMFF_ERR_DATA, error_msg_buffer);
return RMFF_ERR_DATA;
}
len += 1 + 2 * 4 * (tint->f_merged ? 1: tint->num_segments);
buffer = (unsigned char *)safemalloc(len);
ptr = buffer;
*ptr = tint->f_merged ? 0 : tint->num_segments - 1;
ptr++;
if (tint->f_merged) {
rmff_put_uint32_le(ptr, 1);
ptr += 4;
rmff_put_uint32_le(ptr, 0);
ptr += 4;
} else {
for (i = 0; i < tint->num_segments; i++) {
rmff_put_uint32_le(ptr, 1);
ptr += 4;
rmff_put_uint32_le(ptr, tint->segments[i].offset);
ptr += 4;
}
}
for (i = 0; i < tint->num_segments; i++) {
segment = &tint->segments[i];
memcpy(ptr, segment->data, segment->size);
ptr += segment->size;
}
frame = rmff_allocate_frame(len, buffer);
frame->timecode = timecode;
frame->flags = tint->c_keyframe ? RMFF_FRAME_FLAG_KEYFRAME : 0;
tint->assembled_frames = (rmff_frame_t **)
saferealloc(tint->assembled_frames, (tint->num_assembled_frames + 1) *
sizeof(rmff_frame_t *));
tint->assembled_frames[tint->num_assembled_frames] = frame;
tint->num_assembled_frames++;
for (i = 0; i < tint->num_segments; i++)
safefree(tint->segments[i].data);
safefree(tint->segments);
tint->segments = NULL;
tint->num_segments = 0;
return tint->num_assembled_frames;
}
int
rmff_assemble_packed_video_frame(rmff_track_t *track,
rmff_frame_t *frame) {
uint32_t vpkg_header, vpkg_length, vpkg_offset, vpkg_subseq, vpkg_seqnum;
uint32_t len, this_timecode;
int data_len, result;
unsigned char *data;
rmff_track_internal_t *tint;
rmff_video_segment_t *segment;
if ((track == NULL) || (frame == NULL) || (frame->data == NULL) ||
(frame->size == 0)) {
set_error(RMFF_ERR_PARAMETERS, NULL);
return RMFF_ERR_PARAMETERS;
}
tint = (rmff_track_internal_t *)track->internal;
if (tint->num_segments == 0) {
tint->c_keyframe = (frame->flags & RMFF_FRAME_FLAG_KEYFRAME) ==
RMFF_FRAME_FLAG_KEYFRAME ? 1 : 0;
tint->f_merged = 0;
}
if (frame->timecode != tint->c_timecode)
deliver_segments(track, tint->c_timecode);
data = frame->data;
data_len = frame->size;
while (data_len > 2) {
vpkg_subseq = 0;
vpkg_seqnum = 0;
vpkg_length = 0;
vpkg_offset = 0;
this_timecode = frame->timecode;
// bit 7: 1=last block in block chain
// bit 6: 1=short header (only one block?)
vpkg_header = data_get_uint8(&data, &data_len);
if ((vpkg_header & 0xc0) == 0x40) {
// seems to be a very short header
// 2 bytes, purpose of the second byte yet unknown
data_get_uint8(&data, &data_len);
vpkg_length = data_len;
} else {
if ((vpkg_header & 0x40) == 0) {
if (data_len < 1) {
set_error(RMFF_ERR_DATA, "Assembly failed: not enough frame "
"data available");
return RMFF_ERR_DATA;
}
// sub-seqnum (bits 0-6: number of fragment. bit 7: ???)
vpkg_subseq = data_get_uint8(&data, &data_len) & 0x7f;
}
// size of the complete packet
// bit 14 is always one (same applies to the offset)
if (data_len < 2) {
set_error(RMFF_ERR_DATA, "Assembly failed: not enough frame "
"data available");
return RMFF_ERR_DATA;
}
vpkg_length = data_get_uint16_be(&data, &data_len);
if ((vpkg_length & 0x8000) == 0x8000)
tint->f_merged = 1;
if ((vpkg_length & 0x4000) == 0) {
if (data_len < 2) {
set_error(RMFF_ERR_DATA, "Assembly failed: not enough frame "
"data available");
return RMFF_ERR_DATA;
}
vpkg_length <<= 16;
vpkg_length |= data_get_uint16_be(&data, &data_len);
vpkg_length &= 0x3fffffff;
} else
vpkg_length &= 0x3fff;
// offset of the following data inside the complete packet
// Note: if (hdr&0xC0)==0x80 then offset is relative to the
// _end_ of the packet, so it's equal to fragment size!!!
if (data_len < 2) {
set_error(RMFF_ERR_DATA, "Assembly failed: not enough frame "
"data available");
return RMFF_ERR_DATA;
}
vpkg_offset = data_get_uint16_be(&data, &data_len);
if ((vpkg_offset & 0x4000) == 0) {
if (data_len < 2) {
set_error(RMFF_ERR_DATA, "Assembly failed: not enough frame "
"data available");
return RMFF_ERR_DATA;
}
vpkg_offset <<= 16;
vpkg_offset |= data_get_uint16_be(&data, &data_len);
vpkg_offset &= 0x3fffffff;
} else
vpkg_offset &= 0x3fff;
if (data_len < 1) {
set_error(RMFF_ERR_DATA, "Assembly failed: not enough frame "
"data available");
return RMFF_ERR_DATA;
}
vpkg_seqnum = data_get_uint8(&data, &data_len);
if ((vpkg_header & 0xc0) == 0xc0) {
this_timecode = vpkg_offset;
vpkg_offset = 0;
} else if ((vpkg_header & 0xc0) == 0x80)
vpkg_offset = vpkg_length - vpkg_offset;
}
if (data_len < (int)(vpkg_length - vpkg_offset))
len = data_len;
else
len = (int)(vpkg_length - vpkg_offset);
tint->segments = (rmff_video_segment_t *)
saferealloc(tint->segments, (tint->num_segments + 1) *
sizeof(rmff_video_segment_t));
segment = &tint->segments[tint->num_segments];
tint->num_segments++;
segment->offset = vpkg_offset;
segment->data = (unsigned char *)safemalloc(len);
segment->size = len;
memcpy(segment->data, data, len);
data += len;
data_len -= len;
tint->c_timecode = this_timecode;
if (((vpkg_header & 0x80) == 0x80) ||
((vpkg_offset + len) >= vpkg_length)) {
result = deliver_segments(track, this_timecode);
tint->c_keyframe = 0;
if (result < 0)
return result;
}
}
return tint->num_assembled_frames;
}
rmff_frame_t *
rmff_get_packed_video_frame(rmff_track_t *track) {
rmff_track_internal_t *tint;
rmff_frame_t *frame;
if (track == NULL) {
set_error(RMFF_ERR_PARAMETERS, NULL);
return NULL;
}
tint = (rmff_track_internal_t *)track->internal;
if (tint->num_assembled_frames == 0) {
clear_error();
return NULL;
}
frame = tint->assembled_frames[0];
tint->num_assembled_frames--;
if (tint->num_assembled_frames == 0) {
safefree(tint->assembled_frames);
tint->assembled_frames = NULL;
} else {
memmove(&tint->assembled_frames[0], &tint->assembled_frames[1],
tint->num_assembled_frames * sizeof(rmff_frame_t *));
tint->assembled_frames = (rmff_frame_t **)
saferealloc(tint->assembled_frames, tint->num_assembled_frames *
sizeof(rmff_frame_t *));
}
clear_error();
return frame;
}
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