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This fixes most audio seeking problems with AVI files, but

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still needs some work. The sync code was never executed, as
if (len < chunkSize) (len = signed, chunkSize = unsigned) 
was compiled into an unsigned compare and thus always false
for len=-1.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21441 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Marcus Overhagen 2007-06-17 19:38:59 +00:00
parent f5390ac494
commit d85ccec96a
1 changed files with 47 additions and 24 deletions
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71
src/add-ons/media/plugins/mp3_decoder/mp3DecoderPlugin.cpp
View File

@ -29,7 +29,7 @@
#include <MediaRoster.h>
#include "mp3DecoderPlugin.h"
//#define TRACE_MP3_DECODER
#define TRACE_MP3_DECODER
#ifdef TRACE_MP3_DECODER
#define TRACE printf
#else
@ -182,11 +182,7 @@ mp3Decoder::Seek(uint32 seekTo,
int64 seekFrame, int64 *frame,
bigtime_t seekTime, bigtime_t *time)
{
ExitMP3(&fMpgLibPrivate);
InitMP3(&fMpgLibPrivate);
fResidualBytes = 0;
fNeedSync = true;
fDecodingError = false;
return B_OK;
}
@ -199,14 +195,25 @@ mp3Decoder::Decode(void *buffer, int64 *frameCount,
uint8 * out_buffer = static_cast<uint8 *>(buffer);
int32 out_bytes_needed = fOutputBufferSize;
int32 out_bytes = 0;
if (fDecodingError)
return B_ERROR;
mediaHeader->start_time = fStartTime;
//TRACE("mp3Decoder: Decoding start time %.6f\n", fStartTime / 1000000.0);
while (out_bytes_needed > 0) {
if (fNeedSync) {
TRACE("mp3Decoder::Decode: syncing...\n");
ExitMP3(&fMpgLibPrivate);
InitMP3(&fMpgLibPrivate);
fDecodingError = false;
fResidualBytes = 0;
mediaHeader->start_time = -1;
// fNeedSync is reset in DecodeNextChunk
}
if (fDecodingError)
return B_ERROR;
if (fResidualBytes) {
int32 bytes = min_c(fResidualBytes, out_bytes_needed);
memcpy(out_buffer, fResidualBuffer, bytes);
@ -227,6 +234,8 @@ mp3Decoder::Decode(void *buffer, int64 *frameCount,
fDecodingError = true;
break;
}
if (mediaHeader->start_time == -1)
mediaHeader->start_time = fStartTime;
}
*frameCount = out_bytes / fFrameSize;
@ -253,43 +262,57 @@ mp3Decoder::DecodeNextChunk()
}
// get another chunk and push it to the decoder
err = GetNextChunk(&chunkBuffer, &chunkSize, &mh);
if (err != B_OK)
return err;
fStartTime = mh.start_time;
// TRACE("mp3Decoder: fStartTime reset to %.6f\n", fStartTime / 1000000.0);
// resync after a seek
if (fNeedSync) {
TRACE("mp3Decoder::DecodeNextChunk: Syncing...\n");
if (chunkSize < 4) {
TRACE("mp3Decoder::Decode: Sync failed, frame too small\n");
TRACE("mp3Decoder::DecodeNextChunk: Sync failed, frame too small\n");
return B_ERROR;
}
int len = GetFrameLength(chunkBuffer);
// len = -1 when not at frame start
TRACE("mp3Decoder::DecodeNextChunk: chunkSize %d, first frame length %d\n", chunkSize, len);
// len == -1 when not at frame start
// len == chunkSize for mp3 reader (delivers single frames)
if (len < chunkSize) {
while (chunkSize > 100) {
if (IsValidStream((uint8 *)chunkBuffer, chunkSize))
if (len < (int)chunkSize) {
// FIXME: join a few chunks to create a larger (2k) buffer, and use:
// while (chunkSize > 100) {
// if (IsValidStream((uint8 *)chunkBuffer, chunkSize))
while (chunkSize >= 4) {
if (GetFrameLength(chunkBuffer) > 0)
break;
chunkBuffer = (uint8 *)chunkBuffer + 1;
chunkSize--;
}
if (chunkSize <= 100) {
TRACE("mp3Decoder::Decode: Sync failed\n");
// if (chunkSize <= 100) {
if (chunkSize == 3) {
TRACE("mp3Decoder::DecodeNextChunk: Sync failed\n");
return B_ERROR;
}
TRACE("mp3Decoder::DecodeNextChunk: new chunkSize %d, first frame length %d\n", chunkSize, GetFrameLength(chunkBuffer));
}
fNeedSync = false;
}
fStartTime = mh.start_time;
//TRACE("mp3Decoder: fStartTime reset to %.6f\n", fStartTime / 1000000.0);
result = decodeMP3(&fMpgLibPrivate, (char *)chunkBuffer, chunkSize, (char *)fDecodeBuffer, DECODE_BUFFER_SIZE, &outsize);
if (result == MP3_ERR) {
TRACE("mp3Decoder::Decode: decodeMP3 returned MP3_ERR\n");
if (result == MP3_NEED_MORE) {
TRACE("mp3Decoder::DecodeNextChunk: decodeMP3 returned MP3_NEED_MORE\n");
fResidualBuffer = NULL;
fResidualBytes = 0;
return B_OK;
} else if (result != MP3_OK) {
TRACE("mp3Decoder::DecodeNextChunk: decodeMP3 returned error %d\n", result);
return B_ERROR;
// fNeedSync = true;
// fResidualBuffer = NULL;
// fResidualBytes = 0;
// return B_OK;
}
//printf("mp3Decoder::Decode: decoded %d bytes into %d bytes\n",chunkSize, outsize);