renamed libav to libavformat

Originally committed as revision 1276 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 687 insertions, 0 deletions

diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
new file mode 100644
index 0000000000..2e931bd849
--- /dev/null
+++ b/libavformat/aviobuf.c
@@ -0,0 +1,687 @@
+/*
+ * Buffered I/O for ffmpeg system
+ * Copyright (c) 2000,2001 Fabrice Bellard
+ *
+ * This library 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.
+ *
+ * This library 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
+ */
+#include "avformat.h"
+#include <stdarg.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->max_packet_size = 0;
+    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, const 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->seek(s->opaque, offset, SEEK_SET);
+            s->pos = offset;
+        }
+        s->eof_reached = 0;
+    }
+    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);
+}
+
+/* IEEE format is assumed */
+void put_be64_double(ByteIOContext *s, double val)
+{
+    union {
+        double d;
+        UINT64 ull;
+    } u;
+    u.d = val;
+    put_be64(s, u.ull);
+}
+
+void put_strz(ByteIOContext *s, const char *str)
+{
+    if (str)
+        put_buffer(s, (const unsigned char *) str, strlen(str) + 1);
+    else
+        put_byte(s, 0);
+}
+
+void put_le64(ByteIOContext *s, UINT64 val)
+{
+    put_le32(s, (UINT32)(val & 0xffffffff));
+    put_le32(s, (UINT32)(val >> 32));
+}
+
+void put_be64(ByteIOContext *s, UINT64 val)
+{
+    put_be32(s, (UINT32)(val >> 32));
+    put_be32(s, (UINT32)(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, const char *tag)
+{
+    while (*tag) {
+        put_byte(s, *tag++);
+    }
+}
+
+/* Input stream */
+
+static void fill_buffer(ByteIOContext *s)
+{
+    int len;
+
+    /* no need to do anything if EOF already reached */
+    if (s->eof_reached)
+        return;
+    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;
+    } else {
+        s->pos += len;
+        s->buf_ptr = s->buffer;
+        s->buf_end = s->buffer + len;
+    }
+}
+
+/* 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)
+{
+    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;
+    }
+}
+
+/* NOTE: return URL_EOF (-1) if EOF */
+int url_fgetc(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 URL_EOF;
+    }
+}
+
+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;
+}
+
+UINT64 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;
+}
+
+double get_be64_double(ByteIOContext *s)
+{
+    union {
+        double d;
+        UINT64 ull;
+    } u;
+
+    u.ull = get_be64(s);
+    return u.d;
+}
+
+char *get_strz(ByteIOContext *s, char *buf, int maxlen)
+{
+    int i = 0;
+    char c;
+
+    while ((c = get_byte(s))) {
+        if (i < maxlen-1)
+            buf[i++] = c;
+    }
+    
+    buf[i] = 0; /* Ensure null terminated, but may be truncated */
+
+    return buf;
+}
+
+UINT64 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, INT64 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, 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 */
+    } else {
+        buffer_size = IO_BUFFER_SIZE;
+    }
+    buffer = av_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) {
+        av_free(buffer);
+        return -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 *buffer;
+    buffer = av_malloc(buf_size);
+    if (!buffer)
+        return -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;
+    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 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;
+    
+    av_free(s->buffer);
+    memset(s, 0, sizeof(ByteIOContext));
+    return url_close(h);
+}
+
+URLContext *url_fileno(ByteIOContext *s)
+{
+    return s->opaque;
+}
+
+/* XXX: currently size is limited */
+int url_fprintf(ByteIOContext *s, const char *fmt, ...)
+{
+    va_list ap;
+    char buf[4096];
+    int ret;
+
+    va_start(ap, fmt);
+    ret = vsnprintf(buf, sizeof(buf), fmt, ap);
+    va_end(ap);
+    put_buffer(s, buf, strlen(buf));
+    return ret;
+}
+
+/* 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;
+    char *q;
+
+    c = url_fgetc(s);
+    if (c == EOF)
+        return NULL;
+    q = buf;
+    for(;;) {
+        if (c == EOF || c == '\n')
+            break;
+        if ((q - buf) < buf_size - 1)
+            *q++ = c;
+        c = url_fgetc(s);
+    }
+    if (buf_size > 0)
+        *q = '\0';
+    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;
+}
+
+/* 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)
+{
+    put_flush_packet(s);
+    return s->buf_ptr - s->buffer;
+}
+
+/* output in a dynamic buffer */
+
+typedef struct DynBuffer {
+    int pos, size, allocated_size;
+    UINT8 *buffer;
+    int io_buffer_size;
+    UINT8 io_buffer[1];
+} DynBuffer;
+
+static void dyn_buf_write(void *opaque, UINT8 *buf, int buf_size)
+{
+    DynBuffer *d = opaque;
+    int new_size, new_allocated_size;
+    UINT8 *new_buffer;
+    
+    /* reallocate buffer if needed */
+    new_size = d->pos + buf_size;
+    new_allocated_size = d->allocated_size;
+    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;    
+    }
+    
+    if (new_allocated_size > d->allocated_size) {
+        new_buffer = av_malloc(new_allocated_size);
+        if (!new_buffer)
+            return;
+        memcpy(new_buffer, d->buffer, d->size);
+        av_free(d->buffer);
+        d->buffer = new_buffer;
+        d->allocated_size = new_allocated_size;
+    }
+    memcpy(d->buffer + d->pos, buf, buf_size);
+    d->pos = new_size;
+    if (d->pos > d->size)
+        d->size = d->pos;
+}
+
+static void dyn_packet_buf_write(void *opaque, UINT8 *buf, int buf_size)
+{
+    unsigned char buf1[4];
+
+    /* packetized write: output the header */
+    buf1[0] = (buf_size >> 24);
+    buf1[1] = (buf_size >> 16);
+    buf1[2] = (buf_size >> 8);
+    buf1[3] = (buf_size);
+    dyn_buf_write(opaque, buf1, 4);
+
+    /* then the data */
+    dyn_buf_write(opaque, buf, buf_size);
+}
+
+static int dyn_buf_seek(void *opaque, offset_t offset, int whence)
+{
+    DynBuffer *d = opaque;
+
+    if (whence == SEEK_CUR)
+        offset += d->pos;
+    else if (whence == SEEK_END)
+        offset += d->size;
+    if (offset < 0 || offset > 0x7fffffffLL)
+        return -1;
+    d->pos = offset;
+    return 0;
+}
+
+static int url_open_dyn_buf_internal(ByteIOContext *s, int max_packet_size)
+{
+    DynBuffer *d;
+    int io_buffer_size, ret;
+    
+    if (max_packet_size) 
+        io_buffer_size = max_packet_size;
+    else
+        io_buffer_size = 1024;
+        
+    d = av_malloc(sizeof(DynBuffer) + io_buffer_size);
+    if (!d)
+        return -1;
+    d->io_buffer_size = io_buffer_size;
+    d->buffer = NULL;
+    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, 
+                        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 -1;
+    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 **pbuffer)
+{
+    DynBuffer *d = s->opaque;
+    int size;
+
+    put_flush_packet(s);
+
+    *pbuffer = d->buffer;
+    size = d->size;
+    av_free(d);
+    return size;
+}