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nuttx-apps/graphics/ft80x/ft80x_audio.c

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/****************************************************************************
* apps/graphics/ft80x/ft80x_audio.c
*
* Copyright (C) 2018 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdint.h>
#include <fcntl.h>
#include <assert.h>
#include <errno.h>
#include <nuttx/lcd/ft80x.h>
#include "graphics/ft80x.h"
#include "ft80x.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* We will use graphics memory starting at offset zero and through the
* following offset.
*
* REVISIT: Should these not be input parameters?
*/
#define RAMG_MAXOFFSET (64 * 1024)
#define RAMG_MAXMASK (RAMG_MAXOFFSET - 1)
#if FT80X_DL_BUFSIZE > RAMG_MAXOFFSET
# define MAX_DLBUFFER RAMG_MAXOFFSET
#else
# define MAX_DLBUFFER FT80X_DL_BUFSIZE
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: ft80x_audio_playfile
*
* Description:
* Play an audio file
*
* Input Parameters:
* fd - The file descriptor of the FT80x device. Opened by the
* caller with write access.
* buffer - An instance of struct ft80x_dlbuffer_s allocated by the
* caller.
* filepath - Absolute path to the audio file
* format - Audio format. One of:
*
* AUDIO_FORMAT_LINEAR Linear Sample format
* AUDIO_FORMAT_ULAW uLaw Sample format
* AUDIO_FORMAT_ADPCM 4-bit IMA ADPCM Sample format
*
* frequency - Audio sample frequency (<65,536)
* volume - Playback volume (0=mute; 255=max)
*
* Returned Value:
* Zero (OK) on success. A negated errno value on failure.
*
****************************************************************************/
#if CONFIG_NFILE_DESCRIPTORS > 3
int ft80x_audio_playfile(int fd, FAR struct ft80x_dlbuffer_s *buffer,
FAR const char *filepath, uint8_t format,
uint16_t frequency, uint8_t volume)
{
struct ft80x_cmd_memset_s memset;
struct stat buf;
size_t freespace;
size_t remaining;
size_t readlen;
ssize_t nread;
uint32_t offset;
uint32_t readptr;
bool started;
int audiofd;
int ret;
DEBUGASSERT(filepath != NULL);
/* Open the audio file */
audiofd = open(filepath, O_RDONLY);
if (audiofd < 0)
{
int errcode = errno;
ft80x_err("ERROR: open of %s failed: %d\n", filepath, errcode);
return -errcode;
}
/* Get the size of the file */
ret = fstat(audiofd, &buf);
if (ret < 0)
{
ft80x_err("ERROR: fstat of %s failed: %d\n", filepath, ret);
goto errout_with_fd;
}
ft80x_info("File: %s\n", filepath);
ft80x_info("Size: %lu\n", (unsigned long)buf.st_size);
/* Loop until the whole audio file has been sent */
remaining = buf.st_size;
offset = 0;
started = false;
while (remaining > 0)
{
/* How much can we read on this pass? */
readlen = remaining;
/* Clip to the amount that will fit into the display buffer (which we
* are re-purposing for audio data buffer for now)
*/
if (readlen > MAX_DLBUFFER)
{
readlen = MAX_DLBUFFER;
}
/* Check size of the buffer we can fit into RAM G */
do
{
/* Get the current playback position */
readptr = 0;
ret = ft80x_getreg32(fd, FT80X_REG_PLAYBACK_READPTR, &readptr);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg32 failed: %d\n", ret);
goto errout_with_fd;
}
/* Check if the readptr is before the current offset. In this
* case, we can use all of the RAM G from the current offset to
* the end of the buffer.
*
* Case 1: readptr <= offset
*
* +--------+-------+-----+
* | | |xxxxx|
* +--------+-------+-----+
* | | | ^ end buffer
* | | ^ offset
* | ^ readptr
* ^ start buffer
*
* NOTE: There is a race condition here: The readptr could
* overtake the offset before we can perform the write.
*/
if (readptr <= offset)
{
freespace = RAMG_MAXOFFSET - offset;
break;
}
/* No, the readptr is after the offset. In this case we can use
* all of the RAM G from the current offset to the readptr.
*
* Case 2: readptr > offset
*
* +--------+-------+-----+
* | |xxxxxxx| |
* +--------+-------+-----+
* | | | ^ end buffer
* | | ^ readptr
* | ^ offset
* ^ start buffer
*/
else
{
freespace = readptr - offset;
}
/* Terminate the poll when all the memory to end of the RAM G
* buffer is available (see the 'break' above), when an optimally
* sized space is available (MAX_DLBUFFER), there is space to
* write all of the 'remaining' file data, or all of the memory is
* free up to the end of the RAM G buffer (actually already
* handled by the above 'break')
*/
}
while (freespace < MAX_DLBUFFER &&
freespace < remaining &&
freespace < (RAMG_MAXOFFSET - offset));
/* Clip to the amount that will fit at the tail of the RAM G buffer */
if (readlen > freespace)
{
readlen = freespace;
}
/* Read the data into the available display list buffer */
nread = read(audiofd, buffer->dlbuffer, readlen);
if (nread < 0)
{
ret = -errno;
ft80x_err("ERROR: read from %s failed: %d\n", filepath, ret);
goto errout_with_fd;
}
/* Since we know the size of the file, we don't expect EOF */
DEBUGASSERT(nread > 0);
/* Copy the data read into the graphics memory */
ret = ft80x_ramg_write(fd, offset, buffer->dlbuffer, nread);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_ramg_write failed: %d\n", ret);
goto errout_with_fd;
}
/* Update pointers and counts */
offset += nread;
remaining -= nread;
/* Wrap the offset back to the beginning of the buffer if necessary */
if (offset >= RAMG_MAXOFFSET)
{
offset = 0;
}
/* If we have started playing the audio file in RAGM_G. NOTE that
* there is a race condition here. If the chunk size is small or if
* the data transfer rate is low, then there may be data under-run
* which will disrupt the continuity of the audio.
*/
if (!started)
{
/* Start playing at the beginning of graphics memory */
/* Set the audio playback start address */
ret = ft80x_putreg32(fd, FT80X_REG_PLAYBACK_START, FT80X_RAM_G);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_putreg32 failed: %d\n", ret);
goto errout_with_fd;
}
/* Set the length of the audio buffer */
ret = ft80x_putreg32(fd, FT80X_REG_PLAYBACK_LENGTH,
RAMG_MAXOFFSET);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_putreg32 failed: %d\n", ret);
goto errout_with_fd;
}
/* Set the sample frequency */
ret = ft80x_putreg16(fd, FT80X_REG_PLAYBACK_FREQ, frequency);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_putreg16 failed: %d\n", ret);
goto errout_with_fd;
}
/* Set the audio format */
ret = ft80x_putreg8(fd, FT80X_REG_PLAYBACK_FORMAT, format);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_putreg8 failed: %d\n", ret);
goto errout_with_fd;
}
/* Loop when we get to the end of the file */
ret = ft80x_putreg8(fd, FT80X_REG_PLAYBACK_LOOP, 1);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_putreg8 failed: %d\n", ret);
goto errout_with_fd;
}
/* Set the volume */
ret = ft80x_putreg8(fd, FT80X_REG_VOL_PB, volume);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_putreg8 failed: %d\n", ret);
goto errout_with_fd;
}
/* And start the playback */
ret = ft80x_putreg8(fd, FT80X_REG_PLAYBACK_PLAY, 1);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_putreg8 failed: %d\n", ret);
goto errout_with_fd;
}
started = true;
}
}
/* Transfer is complete. 'offset' points to the end of the file in RAM G.
* Clear all of the RAM G at the end of the file so that audio is muted
* when the end of file is encountered.
*
* Case 1: readptr <= offset
*
* +--------+-------+-----+
* |00000000| |00000|
* +--------+-------+-----+
* | | | ^ end buffer
* | | ^ offset
* | ^ readptr
* ^ start buffer
*
* Case 2: readptr > offset
*
* +--------+-------+-----+
* | |0000000| |
* +--------+-------+-----+
* | | | ^ end buffer
* | | ^ readptr
* | ^ offset
* ^ start buffer
*/
memset.cmd = FT80X_CMD_MEMSET;
memset.value = 0;
readptr = 0;
ret = ft80x_getreg32(fd, FT80X_REG_PLAYBACK_READPTR, &readptr);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg32 failed: %d\n", ret);
goto errout_with_fd;
}
if (readptr <= offset)
{
if (offset < RAMG_MAXOFFSET)
{
memset.ptr = FT80X_RAM_G + offset;
memset.num = RAMG_MAXOFFSET - offset;
ret = ft80x_coproc_send(fd, (FAR const uint32_t *)&memset, 4);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_coproc_send failed: %d\n", ret);
goto errout_with_fd;
}
}
if (readptr > 0)
{
memset.ptr = FT80X_RAM_G;
memset.num = readptr;
ret = ft80x_coproc_send(fd, (FAR const uint32_t *)&memset, 4);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_coproc_send failed: %d\n", ret);
goto errout_with_fd;
}
}
}
else /* if (readptr > offset) */
{
memset.ptr = FT80X_RAM_G + offset;
memset.num = readptr - offset;
ret = ft80x_coproc_send(fd, (FAR const uint32_t *)&memset, 4);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_coproc_send failed: %d\n", ret);
goto errout_with_fd;
}
}
/* Wait until the read pointer wraps back to the beginning of the buffer */
do
{
readptr = 0;
ret = ft80x_getreg32(fd, FT80X_REG_PLAYBACK_READPTR, &readptr);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg32 failed: %d\n", ret);
goto errout_with_fd;
}
}
while (readptr > offset);
/* Wait until the read pointer pass through write pointer into the zeroed
* area.
*
* REVISIT: What if the offset is at the very end of the buffer?
*/
do
{
readptr = 0;
ret = ft80x_getreg32(fd, FT80X_REG_PLAYBACK_READPTR, &readptr);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_getreg32 failed: %d\n", ret);
goto errout_with_fd;
}
}
while (readptr < offset);
/* The file is done... */
/* Stop looping */
ret = ft80x_putreg8(fd, FT80X_REG_PLAYBACK_LOOP, 1);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_putreg8 failed: %d\n", ret);
goto errout_with_fd;
}
/* Set the playback length to zero */
ret = ft80x_putreg32(fd, FT80X_REG_PLAYBACK_LENGTH, 0);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_putreg32 failed: %d\n", ret);
goto errout_with_fd;
}
/* Set the volume to zero */
ret = ft80x_putreg8(fd, FT80X_REG_VOL_PB, volume);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_putreg8 failed: %d\n", ret);
goto errout_with_fd;
}
/* And stop the playback */
ret = ft80x_putreg8(fd, FT80X_REG_PLAYBACK_PLAY, 1);
if (ret < 0)
{
ft80x_err("ERROR: ft80x_putreg8 failed: %d\n", ret);
}
errout_with_fd:
close(audiofd);
return ret;
}
#endif /* CONFIG_NFILE_DESCRIPTORS > 3 */
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