* Buffered I/O for ffmpeg system
* Copyright (c) 2000,2001 Fabrice Bellard
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "avio.h"
+#include "crc.h"
#include <stdarg.h>
#define IO_BUFFER_SIZE 32768
+static void fill_buffer(ByteIOContext *s);
+
int init_put_byte(ByteIOContext *s,
unsigned char *buffer,
int buffer_size,
void *opaque,
int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
- int (*seek)(void *opaque, offset_t offset, int whence))
+ offset_t (*seek)(void *opaque, offset_t offset, int whence))
{
s->buffer = buffer;
s->buffer_size = buffer_size;
s->buf_ptr = buffer;
- s->write_flag = write_flag;
- if (!s->write_flag)
- s->buf_end = buffer;
- else
- s->buf_end = buffer + buffer_size;
+ url_resetbuf(s, write_flag ? URL_WRONLY : URL_RDONLY);
s->opaque = opaque;
s->write_packet = write_packet;
s->read_packet = read_packet;
s->is_streamed = 0;
s->max_packet_size = 0;
s->update_checksum= NULL;
+ if(!read_packet && !write_flag){
+ s->pos = buffer_size;
+ s->buf_end = s->buffer + buffer_size;
+ }
return 0;
}
-
-#ifdef CONFIG_ENCODERS
static void flush_buffer(ByteIOContext *s)
{
if (s->buf_ptr > s->buffer) {
void put_byte(ByteIOContext *s, int b)
{
*(s->buf_ptr)++ = b;
- if (s->buf_ptr >= s->buf_end)
+ if (s->buf_ptr >= s->buf_end)
flush_buffer(s);
}
memcpy(s->buf_ptr, buf, len);
s->buf_ptr += len;
- if (s->buf_ptr >= s->buf_end)
+ if (s->buf_ptr >= s->buf_end)
flush_buffer(s);
buf += len;
flush_buffer(s);
s->must_flush = 0;
}
-#endif //CONFIG_ENCODERS
offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
{
offset_t offset1;
+ offset_t pos= s->pos - (s->write_flag ? 0 : (s->buf_end - s->buffer));
if (whence != SEEK_CUR && whence != SEEK_SET)
- return -EINVAL;
-
-#ifdef CONFIG_ENCODERS
- if (s->write_flag) {
- if (whence == SEEK_CUR) {
- offset1 = s->pos + (s->buf_ptr - s->buffer);
- if (offset == 0)
- return offset1;
- offset += offset1;
- }
- offset1 = offset - s->pos;
- if (!s->must_flush &&
- offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
- /* can do the seek inside the buffer */
- s->buf_ptr = s->buffer + offset1;
- } else {
- if (!s->seek)
- return -EPIPE;
+ return AVERROR(EINVAL);
+
+ if (whence == SEEK_CUR) {
+ offset1 = pos + (s->buf_ptr - s->buffer);
+ if (offset == 0)
+ return offset1;
+ offset += offset1;
+ }
+ offset1 = offset - pos;
+ if (!s->must_flush &&
+ offset1 >= 0 && offset1 < (s->buf_end - s->buffer)) {
+ /* can do the seek inside the buffer */
+ s->buf_ptr = s->buffer + offset1;
+ } else if(s->is_streamed && !s->write_flag &&
+ offset1 >= 0 && offset1 < (s->buf_end - s->buffer) + (1<<16)){
+ while(s->pos < offset && !s->eof_reached)
+ fill_buffer(s);
+ s->buf_ptr = s->buf_end + offset - s->pos;
+ } else {
+ offset_t res = AVERROR(EPIPE);
+
+#if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
+ if (s->write_flag) {
flush_buffer(s);
s->must_flush = 1;
- s->buf_ptr = s->buffer;
- s->seek(s->opaque, offset, SEEK_SET);
- s->pos = offset;
- }
- } else
-#endif //CONFIG_ENCODERS
- {
- if (whence == SEEK_CUR) {
- offset1 = s->pos - (s->buf_end - s->buffer) + (s->buf_ptr - s->buffer);
- if (offset == 0)
- return offset1;
- offset += offset1;
- }
- offset1 = offset - (s->pos - (s->buf_end - s->buffer));
- if (offset1 >= 0 && offset1 <= (s->buf_end - s->buffer)) {
- /* can do the seek inside the buffer */
- s->buf_ptr = s->buffer + offset1;
- } else {
- if (!s->seek)
- return -EPIPE;
- s->buf_ptr = s->buffer;
+ } else
+#endif /* defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK) */
+ {
s->buf_end = s->buffer;
- if (s->seek(s->opaque, offset, SEEK_SET) == (offset_t)-EPIPE)
- return -EPIPE;
- s->pos = offset;
}
- s->eof_reached = 0;
+ s->buf_ptr = s->buffer;
+ if (!s->seek || (res = s->seek(s->opaque, offset, SEEK_SET)) < 0)
+ return res;
+ s->pos = offset;
}
+ s->eof_reached = 0;
return offset;
}
return url_fseek(s, 0, SEEK_CUR);
}
+offset_t url_fsize(ByteIOContext *s)
+{
+ offset_t size;
+
+ if (!s->seek)
+ return AVERROR(EPIPE);
+ size = s->seek(s->opaque, 0, AVSEEK_SIZE);
+ if(size<0){
+ if ((size = s->seek(s->opaque, -1, SEEK_END)) < 0)
+ return size;
+ size++;
+ s->seek(s->opaque, s->pos, SEEK_SET);
+ }
+ return size;
+}
+
int url_feof(ByteIOContext *s)
{
return s->eof_reached;
return s->error;
}
-#ifdef CONFIG_ENCODERS
void put_le32(ByteIOContext *s, unsigned int val)
{
put_byte(s, val);
put_byte(s, val);
}
-/* IEEE format is assumed */
-void put_be64_double(ByteIOContext *s, double val)
-{
- union {
- double d;
- uint64_t ull;
- } u;
- u.d = val;
- put_be64(s, u.ull);
-}
-
void put_strz(ByteIOContext *s, const char *str)
{
if (str)
put_byte(s, val);
}
+void put_le24(ByteIOContext *s, unsigned int val)
+{
+ put_le16(s, val & 0xffff);
+ put_byte(s, val >> 16);
+}
+
+void put_be24(ByteIOContext *s, unsigned int val)
+{
+ put_be16(s, val >> 8);
+ put_byte(s, val);
+}
+
void put_tag(ByteIOContext *s, const char *tag)
{
while (*tag) {
put_byte(s, *tag++);
}
}
-#endif //CONFIG_ENCODERS
/* Input stream */
static void fill_buffer(ByteIOContext *s)
{
- int len;
+ int len=0;
/* no need to do anything if EOF already reached */
if (s->eof_reached)
return;
if(s->update_checksum){
- s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
+ if(s->buf_end > s->checksum_ptr)
+ s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_end - s->checksum_ptr);
s->checksum_ptr= s->buffer;
}
- len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
+ if(s->read_packet)
+ len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
if (len <= 0) {
/* do not modify buffer if EOF reached so that a seek back can
be done without rereading data */
s->eof_reached = 1;
- if(len<0)
- s->error= len;
+ if(len<0)
+ s->error= len;
} else {
s->pos += len;
s->buf_ptr = s->buffer;
}
}
+unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
+ return av_crc(av_crc04C11DB7, checksum, buf, len);
+}
+
unsigned long get_checksum(ByteIOContext *s){
s->checksum= s->update_checksum(s->checksum, s->checksum_ptr, s->buf_ptr - s->checksum_ptr);
s->update_checksum= NULL;
void init_checksum(ByteIOContext *s, unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), unsigned long checksum){
s->update_checksum= update_checksum;
if(s->update_checksum){
- s->checksum= s->update_checksum(checksum, NULL, 0);
+ s->checksum= checksum;
s->checksum_ptr= s->buf_ptr;
}
}
-/* NOTE: return 0 if EOF, so you cannot use it if EOF handling is
- necessary */
/* XXX: put an inline version */
int get_byte(ByteIOContext *s)
{
}
}
-/* NOTE: return URL_EOF (-1) if EOF */
int url_fgetc(ByteIOContext *s)
{
if (s->buf_ptr < s->buf_end) {
if (len > size)
len = size;
if (len == 0) {
- fill_buffer(s);
- len = s->buf_end - s->buf_ptr;
- if (len == 0)
- break;
+ if(size > s->buffer_size && !s->update_checksum){
+ if(s->read_packet)
+ len = s->read_packet(s->opaque, buf, size);
+ if (len <= 0) {
+ /* do not modify buffer if EOF reached so that a seek back can
+ be done without rereading data */
+ s->eof_reached = 1;
+ if(len<0)
+ s->error= len;
+ break;
+ } else {
+ s->pos += len;
+ size -= len;
+ buf += len;
+ s->buf_ptr = s->buffer;
+ s->buf_end = s->buffer/* + len*/;
+ }
+ }else{
+ fill_buffer(s);
+ len = s->buf_end - s->buf_ptr;
+ if (len == 0)
+ break;
+ }
} else {
memcpy(buf, s->buf_ptr, len);
buf += len;
{
int len;
+ if(size<0)
+ return -1;
+
len = s->buf_end - s->buf_ptr;
if (len == 0) {
fill_buffer(s);
return val;
}
-unsigned int get_le32(ByteIOContext *s)
+unsigned int get_le24(ByteIOContext *s)
{
unsigned int val;
- val = get_byte(s);
- val |= get_byte(s) << 8;
+ val = get_le16(s);
val |= get_byte(s) << 16;
- val |= get_byte(s) << 24;
+ return val;
+}
+
+unsigned int get_le32(ByteIOContext *s)
+{
+ unsigned int val;
+ val = get_le16(s);
+ val |= get_le16(s) << 16;
return val;
}
return val;
}
-unsigned int get_be32(ByteIOContext *s)
+unsigned int get_be24(ByteIOContext *s)
{
unsigned int val;
- val = get_byte(s) << 24;
- val |= get_byte(s) << 16;
- val |= get_byte(s) << 8;
+ val = get_be16(s) << 8;
val |= get_byte(s);
return val;
}
-
-double get_be64_double(ByteIOContext *s)
+unsigned int get_be32(ByteIOContext *s)
{
- union {
- double d;
- uint64_t ull;
- } u;
-
- u.ull = get_be64(s);
- return u.d;
+ unsigned int val;
+ val = get_be16(s) << 16;
+ val |= get_be16(s);
+ return val;
}
char *get_strz(ByteIOContext *s, char *buf, int maxlen)
if (i < maxlen-1)
buf[i++] = c;
}
-
+
buf[i] = 0; /* Ensure null terminated, but may be truncated */
return buf;
/* link with avio functions */
-#ifdef CONFIG_ENCODERS
+#ifdef CONFIG_MUXERS
static int url_write_packet(void *opaque, uint8_t *buf, int buf_size)
{
URLContext *h = opaque;
return url_write(h, buf, buf_size);
}
#else
-#define url_write_packet NULL
-#endif //CONFIG_ENCODERS
+#define url_write_packet NULL
+#endif //CONFIG_MUXERS
static int url_read_packet(void *opaque, uint8_t *buf, int buf_size)
{
return url_read(h, buf, buf_size);
}
-static int url_seek_packet(void *opaque, int64_t offset, int whence)
+static offset_t url_seek_packet(void *opaque, offset_t offset, int whence)
{
URLContext *h = opaque;
return url_seek(h, offset, whence);
uint8_t *buffer;
int buffer_size, max_packet_size;
-
+
max_packet_size = url_get_max_packet_size(h);
if (max_packet_size) {
buffer_size = max_packet_size; /* no need to bufferize more than one packet */
}
buffer = av_malloc(buffer_size);
if (!buffer)
- return -ENOMEM;
+ return AVERROR(ENOMEM);
- if (init_put_byte(s, buffer, buffer_size,
+ if (init_put_byte(s, buffer, buffer_size,
(h->flags & URL_WRONLY || h->flags & URL_RDWR), h,
url_read_packet, url_write_packet, url_seek_packet) < 0) {
av_free(buffer);
- return AVERROR_IO;
+ return AVERROR(EIO);
}
s->is_streamed = h->is_streamed;
s->max_packet_size = max_packet_size;
return 0;
}
-/* XXX: must be called before any I/O */
int url_setbufsize(ByteIOContext *s, int buf_size)
{
uint8_t *buffer;
buffer = av_malloc(buf_size);
if (!buffer)
- return -ENOMEM;
+ return AVERROR(ENOMEM);
av_free(s->buffer);
s->buffer = buffer;
s->buffer_size = buf_size;
s->buf_ptr = buffer;
- if (!s->write_flag)
- s->buf_end = buffer;
- else
- s->buf_end = buffer + buf_size;
+ url_resetbuf(s, s->write_flag ? URL_WRONLY : URL_RDONLY);
+ return 0;
+}
+
+int url_resetbuf(ByteIOContext *s, int flags)
+{
+ URLContext *h = s->opaque;
+ if ((flags & URL_RDWR) || (h && h->flags != flags && !h->flags & URL_RDWR))
+ return AVERROR(EINVAL);
+
+ if (flags & URL_WRONLY) {
+ s->buf_end = s->buffer + s->buffer_size;
+ s->write_flag = 1;
+ } else {
+ s->buf_end = s->buffer;
+ s->write_flag = 0;
+ }
return 0;
}
-/* NOTE: when opened as read/write, the buffers are only used for
- reading */
int url_fopen(ByteIOContext *s, const char *filename, int flags)
{
URLContext *h;
int url_fclose(ByteIOContext *s)
{
URLContext *h = s->opaque;
-
+
av_free(s->buffer);
memset(s, 0, sizeof(ByteIOContext));
return url_close(h);
return s->opaque;
}
-#ifdef CONFIG_ENCODERS
-/* XXX: currently size is limited */
+#ifdef CONFIG_MUXERS
int url_fprintf(ByteIOContext *s, const char *fmt, ...)
{
va_list ap;
put_buffer(s, buf, strlen(buf));
return ret;
}
-#endif //CONFIG_ENCODERS
+#endif //CONFIG_MUXERS
-/* note: unlike fgets, the EOL character is not returned and a whole
- line is parsed. return NULL if first char read was EOF */
char *url_fgets(ByteIOContext *s, char *buf, int buf_size)
{
int c;
return buf;
}
-/*
- * Return the maximum packet size associated to packetized buffered file
- * handle. If the file is not packetized (stream like http or file on
- * disk), then 0 is returned.
- *
- * @param h buffered file handle
- * @return maximum packet size in bytes
- */
int url_fget_max_packet_size(ByteIOContext *s)
{
return s->max_packet_size;
}
-#ifdef CONFIG_ENCODERS
+/* url_open_dyn_buf and url_close_dyn_buf are used in rtp.c to send a response
+ * back to the server even if CONFIG_MUXERS is not set. */
+#if defined(CONFIG_MUXERS) || defined(CONFIG_NETWORK)
/* buffer handling */
int url_open_buf(ByteIOContext *s, uint8_t *buf, int buf_size, int flags)
{
- return init_put_byte(s, buf, buf_size,
+ return init_put_byte(s, buf, buf_size,
(flags & URL_WRONLY || flags & URL_RDWR),
NULL, NULL, NULL, NULL);
}
-/* return the written or read size */
int url_close_buf(ByteIOContext *s)
{
put_flush_packet(s);
{
DynBuffer *d = opaque;
int new_size, new_allocated_size;
-
+
/* reallocate buffer if needed */
new_size = d->pos + buf_size;
new_allocated_size = d->allocated_size;
+ if(new_size < d->pos || new_size > INT_MAX/2)
+ return -1;
while (new_size > new_allocated_size) {
if (!new_allocated_size)
new_allocated_size = new_size;
else
- new_allocated_size = (new_allocated_size * 3) / 2 + 1;
+ new_allocated_size += new_allocated_size / 2 + 1;
}
-
+
if (new_allocated_size > d->allocated_size) {
d->buffer = av_realloc(d->buffer, new_allocated_size);
if(d->buffer == NULL)
return dyn_buf_write(opaque, buf, buf_size);
}
-static int dyn_buf_seek(void *opaque, offset_t offset, int whence)
+static offset_t dyn_buf_seek(void *opaque, offset_t offset, int whence)
{
DynBuffer *d = opaque;
{
DynBuffer *d;
int io_buffer_size, ret;
-
- if (max_packet_size)
+
+ if (max_packet_size)
io_buffer_size = max_packet_size;
else
io_buffer_size = 1024;
-
+
+ if(sizeof(DynBuffer) + io_buffer_size < io_buffer_size)
+ return -1;
d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
if (!d)
return -1;
d->pos = 0;
d->size = 0;
d->allocated_size = 0;
- ret = init_put_byte(s, d->io_buffer, io_buffer_size,
- 1, d, NULL,
- max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
+ ret = init_put_byte(s, d->io_buffer, io_buffer_size,
+ 1, d, NULL,
+ max_packet_size ? dyn_packet_buf_write : dyn_buf_write,
max_packet_size ? NULL : dyn_buf_seek);
if (ret == 0) {
s->max_packet_size = max_packet_size;
return ret;
}
-/*
- * Open a write only memory stream.
- *
- * @param s new IO context
- * @return zero if no error.
- */
int url_open_dyn_buf(ByteIOContext *s)
{
return url_open_dyn_buf_internal(s, 0);
}
-/*
- * Open a write only packetized memory stream with a maximum packet
- * size of 'max_packet_size'. The stream is stored in a memory buffer
- * with a big endian 4 byte header giving the packet size in bytes.
- *
- * @param s new IO context
- * @param max_packet_size maximum packet size (must be > 0)
- * @return zero if no error.
- */
int url_open_dyn_packet_buf(ByteIOContext *s, int max_packet_size)
{
if (max_packet_size <= 0)
return url_open_dyn_buf_internal(s, max_packet_size);
}
-/*
- * Return the written size and a pointer to the buffer. The buffer
- * must be freed with av_free().
- * @param s IO context
- * @param pointer to a byte buffer
- * @return the length of the byte buffer
- */
int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer)
{
DynBuffer *d = s->opaque;
av_free(d);
return size;
}
-#endif //CONFIG_ENCODERS
+#endif /* CONFIG_MUXERS || CONFIG_NETWORK */
projects / ffmpeg / blobdiff