in graphics/ft80x/ft80x_audio.c [173:571]
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 = AUDIO_BUFSIZE - 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 < (AUDIO_BUFSIZE - 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 >= AUDIO_BUFSIZE)
{
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,
RAMG_STARTADDR);
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,
AUDIO_BUFSIZE);
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 < AUDIO_BUFSIZE)
{
memset.ptr = RAMG_STARTADDR + offset;
memset.num = AUDIO_BUFSIZE - 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 = RAMG_STARTADDR;
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 = RAMG_STARTADDR + 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;
}