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-rw-r--r--libav/aviobuf.c426
1 files changed, 426 insertions, 0 deletions
diff --git a/libav/aviobuf.c b/libav/aviobuf.c
new file mode 100644
index 0000000000..c50629e067
--- /dev/null
+++ b/libav/aviobuf.c
@@ -0,0 +1,426 @@
+/*
+ * Buffered I/O for ffmpeg system
+ * Copyright (c) 2000,2001 Gerard Lantau
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <netinet/in.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <errno.h>
+#include <sys/time.h>
+#include <getopt.h>
+#include <string.h>
+
+#include "avformat.h"
+
+#define IO_BUFFER_SIZE 32768
+
+int init_put_byte(ByteIOContext *s,
+ unsigned char *buffer,
+ int buffer_size,
+ int write_flag,
+ void *opaque,
+ int (*read_packet)(void *opaque, UINT8 *buf, int buf_size),
+ void (*write_packet)(void *opaque, UINT8 *buf, int buf_size),
+ int (*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;
+ s->opaque = opaque;
+ s->write_packet = write_packet;
+ s->read_packet = read_packet;
+ s->seek = seek;
+ s->pos = 0;
+ s->must_flush = 0;
+ s->eof_reached = 0;
+ s->is_streamed = 0;
+ s->packet_size = 1;
+ return 0;
+}
+
+
+static void flush_buffer(ByteIOContext *s)
+{
+ if (s->buf_ptr > s->buffer) {
+ if (s->write_packet)
+ s->write_packet(s->opaque, s->buffer, s->buf_ptr - s->buffer);
+ s->pos += s->buf_ptr - s->buffer;
+ }
+ s->buf_ptr = s->buffer;
+}
+
+void put_byte(ByteIOContext *s, int b)
+{
+ *(s->buf_ptr)++ = b;
+ if (s->buf_ptr >= s->buf_end)
+ flush_buffer(s);
+}
+
+void put_buffer(ByteIOContext *s, unsigned char *buf, int size)
+{
+ int len;
+
+ while (size > 0) {
+ len = (s->buf_end - s->buf_ptr);
+ if (len > size)
+ len = size;
+ memcpy(s->buf_ptr, buf, len);
+ s->buf_ptr += len;
+
+ if (s->buf_ptr >= s->buf_end)
+ flush_buffer(s);
+
+ buf += len;
+ size -= len;
+ }
+}
+
+void put_flush_packet(ByteIOContext *s)
+{
+ flush_buffer(s);
+ s->must_flush = 0;
+}
+
+offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence)
+{
+ offset_t offset1;
+
+ if (whence != SEEK_CUR && whence != SEEK_SET)
+ return -EINVAL;
+
+ 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;
+ flush_buffer(s);
+ s->must_flush = 1;
+ s->buf_ptr = s->buffer;
+ s->seek(s->opaque, offset, SEEK_SET);
+ s->pos = offset;
+ }
+ } else {
+ 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;
+ s->buf_end = s->buffer;
+ s->eof_reached = 0;
+ s->seek(s->opaque, offset, SEEK_SET);
+ s->pos = offset;
+ }
+ }
+ return offset;
+}
+
+void url_fskip(ByteIOContext *s, offset_t offset)
+{
+ url_fseek(s, offset, SEEK_CUR);
+}
+
+offset_t url_ftell(ByteIOContext *s)
+{
+ return url_fseek(s, 0, SEEK_CUR);
+}
+
+int url_feof(ByteIOContext *s)
+{
+ return s->eof_reached;
+}
+
+void put_le32(ByteIOContext *s, unsigned int val)
+{
+ put_byte(s, val);
+ put_byte(s, val >> 8);
+ put_byte(s, val >> 16);
+ put_byte(s, val >> 24);
+}
+
+void put_be32(ByteIOContext *s, unsigned int val)
+{
+ put_byte(s, val >> 24);
+ put_byte(s, val >> 16);
+ put_byte(s, val >> 8);
+ put_byte(s, val);
+}
+
+void put_le64(ByteIOContext *s, unsigned long long val)
+{
+ put_le32(s, val & 0xffffffff);
+ put_le32(s, val >> 32);
+}
+
+void put_be64(ByteIOContext *s, unsigned long long val)
+{
+ put_be32(s, val >> 32);
+ put_be32(s, val & 0xffffffff);
+}
+
+void put_le16(ByteIOContext *s, unsigned int val)
+{
+ put_byte(s, val);
+ put_byte(s, val >> 8);
+}
+
+void put_be16(ByteIOContext *s, unsigned int val)
+{
+ put_byte(s, val >> 8);
+ put_byte(s, val);
+}
+
+void put_tag(ByteIOContext *s, char *tag)
+{
+ while (*tag) {
+ put_byte(s, *tag++);
+ }
+}
+
+/* Input stream */
+
+static void fill_buffer(ByteIOContext *s)
+{
+ int len;
+
+ len = s->read_packet(s->opaque, s->buffer, s->buffer_size);
+ s->pos += len;
+ s->buf_ptr = s->buffer;
+ s->buf_end = s->buffer + len;
+ if (len == 0) {
+ s->eof_reached = 1;
+ }
+}
+
+int get_byte(ByteIOContext *s)
+{
+ if (s->buf_ptr < s->buf_end) {
+ return *s->buf_ptr++;
+ } else {
+ fill_buffer(s);
+ if (s->buf_ptr < s->buf_end)
+ return *s->buf_ptr++;
+ else
+ return 0;
+ }
+}
+
+int get_buffer(ByteIOContext *s, unsigned char *buf, int size)
+{
+ int len, size1;
+
+ size1 = size;
+ while (size > 0) {
+ len = s->buf_end - s->buf_ptr;
+ if (len > size)
+ len = size;
+ if (len == 0) {
+ fill_buffer(s);
+ len = s->buf_end - s->buf_ptr;
+ if (len == 0)
+ break;
+ } else {
+ memcpy(buf, s->buf_ptr, len);
+ buf += len;
+ s->buf_ptr += len;
+ size -= len;
+ }
+ }
+ return size1 - size;
+}
+
+unsigned int get_le16(ByteIOContext *s)
+{
+ unsigned int val;
+ val = get_byte(s);
+ val |= get_byte(s) << 8;
+ return val;
+}
+
+unsigned int get_le32(ByteIOContext *s)
+{
+ unsigned int val;
+ val = get_byte(s);
+ val |= get_byte(s) << 8;
+ val |= get_byte(s) << 16;
+ val |= get_byte(s) << 24;
+ return val;
+}
+
+unsigned long long get_le64(ByteIOContext *s)
+{
+ UINT64 val;
+ val = (UINT64)get_le32(s);
+ val |= (UINT64)get_le32(s) << 32;
+ return val;
+}
+
+unsigned int get_be16(ByteIOContext *s)
+{
+ unsigned int val;
+ val = get_byte(s) << 8;
+ val |= get_byte(s);
+ return val;
+}
+
+unsigned int get_be32(ByteIOContext *s)
+{
+ unsigned int val;
+ val = get_byte(s) << 24;
+ val |= get_byte(s) << 16;
+ val |= get_byte(s) << 8;
+ val |= get_byte(s);
+ return val;
+}
+
+unsigned long long get_be64(ByteIOContext *s)
+{
+ UINT64 val;
+ val = (UINT64)get_be32(s) << 32;
+ val |= (UINT64)get_be32(s);
+ return val;
+}
+
+/* link with avio functions */
+
+void url_write_packet(void *opaque, UINT8 *buf, int buf_size)
+{
+ URLContext *h = opaque;
+ url_write(h, buf, buf_size);
+}
+
+int url_read_packet(void *opaque, UINT8 *buf, int buf_size)
+{
+ URLContext *h = opaque;
+ return url_read(h, buf, buf_size);
+}
+
+int url_seek_packet(void *opaque, long long offset, int whence)
+{
+ URLContext *h = opaque;
+ url_seek(h, offset, whence);
+ return 0;
+}
+
+int url_fdopen(ByteIOContext *s, URLContext *h)
+{
+ UINT8 *buffer;
+ int buffer_size;
+
+ buffer_size = (IO_BUFFER_SIZE / h->packet_size) * h->packet_size;
+ buffer = malloc(buffer_size);
+ if (!buffer)
+ return -ENOMEM;
+
+ if (init_put_byte(s, buffer, buffer_size,
+ (h->flags & URL_WRONLY) != 0, h,
+ url_read_packet, url_write_packet, url_seek_packet) < 0) {
+ free(buffer);
+ return -EIO;
+ }
+ s->is_streamed = h->is_streamed;
+ s->packet_size = h->packet_size;
+ return 0;
+}
+
+/* XXX: must be called before any I/O */
+int url_setbufsize(ByteIOContext *s, int buf_size)
+{
+ UINT8 *buffer;
+ buffer = malloc(buf_size);
+ if (!buffer)
+ return -ENOMEM;
+
+ 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;
+ return 0;
+}
+
+int url_fopen(ByteIOContext *s, const char *filename, int flags)
+{
+ URLContext *h;
+ int err;
+
+ err = url_open(&h, filename, flags);
+ if (err < 0)
+ return err;
+ err = url_fdopen(s, h);
+ if (err < 0) {
+ url_close(h);
+ return err;
+ }
+ return 0;
+}
+
+int url_fclose(ByteIOContext *s)
+{
+ URLContext *h = s->opaque;
+
+ free(s->buffer);
+ memset(s, 0, sizeof(ByteIOContext));
+ return url_close(h);
+}
+
+URLContext *url_fileno(ByteIOContext *s)
+{
+ return s->opaque;
+}
+
+/* buffer handling */
+int url_open_buf(ByteIOContext *s, UINT8 *buf, int buf_size, int flags)
+{
+ return init_put_byte(s, buf, buf_size,
+ (flags & URL_WRONLY) != 0, NULL, NULL, NULL, NULL);
+}
+
+/* return the written or read size */
+int url_close_buf(ByteIOContext *s)
+{
+ return s->buf_ptr - s->buffer;
+}
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