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Don't copy the data from the audio buffer - request_buffer() guarantees to always return up to GUARD_BUFSIZE bytes, even at the buffer wraparound point. This removes the need for the 32KB static input buffer.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7691 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dave Chapman 2005-10-30 21:04:32 +00:00
parent c082bc42a2
commit 29c7da9e69
1 changed files with 1 additions and 22 deletions
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23
apps/codecs/alac.c
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@ -27,9 +27,6 @@ extern char iramstart[];
extern char iramend[];
#endif
#define destBufferSize (1024*16)
char inputBuffer[1024*32]; /* Input buffer */
int32_t outputbuffer[ALAC_MAX_CHANNELS][ALAC_BLOCKSIZE] IBSS_ATTR;
struct codec_api* rb;
@ -125,23 +122,7 @@ enum codec_status codec_start(struct codec_api* api)
buffer=ci->request_buffer((long*)&n,sample_byte_size);
if (n!=sample_byte_size) {
/* The decode_frame function requires the whole frame, so if we
can't get it contiguously from the buffer, then we need to
copy it via a read - i.e. we are at the buffer wraparound
point */
/* Check we estimated the maximum buffer size correctly */
if (sample_byte_size > sizeof(inputBuffer)) {
LOGF("ALAC: Input buffer < %d bytes\n",sample_byte_size);
return CODEC_ERROR;
}
n=ci->read_filebuf(inputBuffer,sample_byte_size);
if (n!=sample_byte_size) {
LOGF("ALAC: Error reading data\n");
return CODEC_ERROR;
}
buffer=inputBuffer;
}
/* Decode one block - returned samples will be host-endian */
@ -149,9 +130,7 @@ enum codec_status codec_start(struct codec_api* api)
samplesdecoded=alac_decode_frame(&alac, buffer, outputbuffer, rb->yield);
/* Advance codec buffer - unless we did a read */
if ((char*)buffer!=(char*)inputBuffer) {
ci->advance_buffer(n);
}
ci->advance_buffer(n);
/* Output the audio */
rb->yield();