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#include <string.h>
#include "wuff_config.h"
#include "wuff.h"
#include "wuff_internal.h"
wuff_sint32 wuff_open(struct wuff_handle ** handle_pointer, struct wuff_callback * callback, void * userdata)
{
struct wuff_handle * handle;
wuff_sint32 wuff_status;
if (handle_pointer == NULL || callback == NULL)
return WUFF_INVALID_PARAM;
handle = wuff_alloc(sizeof(struct wuff_handle));
if (handle == NULL)
return WUFF_MEMALLOC_ERROR;
memset(handle, 0, sizeof(struct wuff_handle));
handle->buffer.data = NULL;
handle->callback = callback;
handle->userdata = userdata;
wuff_status = wuff_setup(handle);
if (wuff_status < 0)
{
wuff_cleanup(handle);
return wuff_status;
}
*handle_pointer = handle;
return WUFF_SUCCESS;
}
wuff_sint32 wuff_close(struct wuff_handle * handle)
{
wuff_sint32 wuff_status;
if (handle == NULL)
return WUFF_INVALID_PARAM;
wuff_status = wuff_cleanup(handle);
WUFF_STATUS_BAIL()
return WUFF_SUCCESS;
}
wuff_sint32 wuff_seek(struct wuff_handle * handle, wuff_uint64 offset)
{
wuff_sint32 wuff_status;
wuff_uint64 seek_offset;
if (handle == NULL)
return WUFF_INVALID_PARAM;
/* Clamp offset to stream length. */
offset = offset <= handle->stream.length ? offset : handle->stream.length;
seek_offset = offset * handle->stream.header.block_size;
wuff_status = handle->callback->seek(handle->userdata, handle->stream.data.offset + seek_offset);
WUFF_STATUS_BAIL()
handle->stream.position = offset;
handle->output.block_offset = 0;
/* A new position requires an empty buffer. */
wuff_status = wuff_buffer_clear(handle);
WUFF_STATUS_BAIL()
return WUFF_SUCCESS;
}
wuff_sint32 wuff_tell(struct wuff_handle * handle, wuff_uint64 * offset)
{
if (handle == NULL)
return WUFF_INVALID_PARAM;
*offset = handle->stream.position;
return WUFF_SUCCESS;
}
wuff_sint32 wuff_stream_info(struct wuff_handle * handle, struct wuff_info * info)
{
if (handle == NULL || info == NULL)
return WUFF_INVALID_PARAM;
info->format = handle->stream.format;
info->channels = handle->stream.header.channels;
info->sample_rate = handle->stream.header.sample_rate;
info->bits_per_sample = handle->stream.header.bits_per_sample;
info->length = handle->stream.length;
/* Think about adding channel mapping and perhaps other things. */
return WUFF_SUCCESS;
}
wuff_sint32 wuff_format(struct wuff_handle * handle, wuff_uint16 format)
{
wuff_sint32 wuff_status;
if (handle == NULL)
return WUFF_INVALID_PARAM;
else if (format >= WUFF_FORMAT_MAX)
return WUFF_FORMAT_UNSUPPORTED;
/* A format change resets the position to the start of the block. */
wuff_status = wuff_seek(handle, handle->stream.position);
WUFF_STATUS_BAIL()
wuff_status = wuff_set_output_format(handle, format);
WUFF_STATUS_BAIL()
return WUFF_SUCCESS;
}
wuff_sint32 wuff_read(struct wuff_handle * handle, wuff_uint8 * out_buffer, size_t * out_size)
{
size_t current_offset;
size_t r_samples, num_samples;
wuff_uint8 head_offset, head, tail, sample_size;
wuff_uint8 * in_buffer;
wuff_sint32 wuff_status;
if (handle == NULL || out_buffer == NULL || out_size == NULL)
return WUFF_INVALID_PARAM;
if (*out_size == 0)
return WUFF_SUCCESS;
sample_size = (wuff_uint8)handle->output.bytes_per_sample;
/* Calculating the number of samples that fit into the application buffer. */
/* The first and last sample may be truncated. */
current_offset = handle->output.block_offset;
head_offset = current_offset % sample_size;
head = head_offset == 0 ? 0 : sample_size - head_offset;
num_samples = wuff_calculate_samples(*out_size, sample_size, &head, &tail);
/* Requesting the number of samples from the buffer. */
/* Calculate the new sample count if necessary and write the output. */
r_samples = num_samples;
wuff_status = wuff_buffer_request(handle, &in_buffer, &r_samples);
WUFF_STATUS_BAIL()
else if (r_samples == 0)
{
/* Possible EOF. */
*out_size = 0;
}
else
{
if (r_samples == 1 && head != 0)
{
/* Only the first truncated sample fits. */
/* I really hope nobody will use small buffers like this. */
num_samples = 0;
tail = 0;
}
else
{
/* At this point the first (possibly truncated) sample will be fully written. */
/* Subtract the first and last sample from the count if they're truncated. */
if (r_samples < num_samples)
tail = 0;
num_samples = r_samples - !!head - !!tail;
}
handle->output.function(out_buffer, in_buffer, num_samples, head_offset, head, tail);
/* Report the number of bytes written. */
*out_size = num_samples * sample_size + head + tail;
/* Adjust the block offset and sample position. */
current_offset += *out_size;
if (current_offset >= handle->output.block_size)
{
handle->stream.position += current_offset / handle->output.block_size;
handle->output.block_offset = current_offset % handle->output.block_size;
}
else
{
handle->output.block_offset = current_offset;
}
/* Release the fully processed samples from the buffer. */
wuff_status = wuff_buffer_release(handle, head_offset + head == sample_size ? num_samples + 1 : num_samples);
WUFF_STATUS_BAIL()
}
return WUFF_SUCCESS;
}
void wuff_version(struct wuff_version * version)
{
if (version == NULL)
return;
version->major = WUFF_VERSION_MAJOR;
version->minor = WUFF_VERSION_MINOR;
version->build = WUFF_VERSION_BUILD;
version->revision = WUFF_VERSION_REVISION;
}
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