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/*****************************************************************
* gmerlin-avdecoder - a general purpose multimedia decoding library
*
* Copyright (c) 2001 - 2012 Members of the Gmerlin project
* gmerlin-general@lists.sourceforge.net
* http://gmerlin.sourceforge.net
*
* 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, see <http://www.gnu.org/licenses/>.
* *****************************************************************/
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <avdec_private.h>
typedef struct
{
uint8_t * data;
uint8_t * data_ptr;
bgav_input_context_t* input;
} mem_priv_t;
static int read_mem(bgav_input_context_t* ctx,
uint8_t * buffer, int len)
{
int bytes_to_read;
int bytes_left;
mem_priv_t * priv = ctx->priv;
bytes_left = ctx->total_bytes - (uint32_t)(priv->data_ptr - priv->data);
bytes_to_read = (len < bytes_left) ? len : bytes_left;
memcpy(buffer, priv->data_ptr, bytes_to_read);
priv->data_ptr += bytes_to_read;
return bytes_to_read;
}
static int64_t seek_byte_mem(bgav_input_context_t * ctx,
int64_t pos, int whence)
{
mem_priv_t * priv = ctx->priv;
priv->data_ptr = priv->data + ctx->position;
return ctx->position;
}
static void close_mem(bgav_input_context_t * ctx)
{
mem_priv_t * priv = ctx->priv;
free(priv);
}
static const bgav_input_t input_mem =
{
.open = NULL, /* Not needed */
.read = read_mem,
.seek_byte = seek_byte_mem,
.close = close_mem
};
bgav_input_context_t * bgav_input_open_memory(uint8_t * data,
uint32_t data_size,
const bgav_options_t * opt)
{
bgav_input_context_t * ret;
mem_priv_t * priv;
ret = bgav_input_create(NULL, opt);
priv = calloc(1, sizeof(*priv));
ret->priv = priv;
ret->input = &input_mem;
priv->data = data;
priv->data_ptr = data;
ret->total_bytes = data_size;
return ret;
}
void bgav_input_reopen_memory(bgav_input_context_t * ctx,
uint8_t * data,
uint32_t data_size)
{
mem_priv_t * priv;
priv = ctx->priv;
priv->data = data;
priv->data_ptr = data;
ctx->total_bytes = data_size;
ctx->position = 0;
gavl_buffer_reset(&ctx->buf);
}
/* Buffer for another input */
static int read_buffer(bgav_input_context_t* ctx,
uint8_t * buffer, int len)
{
int result;
int old_size;
mem_priv_t * priv = ctx->priv;
old_size = priv->data_ptr - priv->data;
bgav_input_ensure_buffer_size(priv->input, old_size + len);
priv->data = priv->input->buf.buf;
priv->data_ptr = priv->input->buf.buf + old_size;
ctx->total_bytes = priv->input->buf.len;
result = read_mem(ctx, buffer, len);
ctx->total_bytes = 0;
return result;
}
static const bgav_input_t input_buffer =
{
.open = NULL, /* Not needed */
.read = read_buffer,
// .seek_byte = seek_byte_mem,
.close = close_mem,
};
bgav_input_context_t * bgav_input_open_as_buffer(bgav_input_context_t * input)
{
bgav_input_context_t * ret;
mem_priv_t * priv;
ret = bgav_input_create(NULL, input->opt);
priv = calloc(1, sizeof(*priv));
ret->priv = priv;
ret->input = &input_buffer;
priv->input = input;
priv->data = input->buf.buf;
priv->data_ptr = input->buf.buf;
// ret->total_bytes = priv->input->buffer_size;
return ret;
}
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