/*!
* \param *dc The current DecodingContext.
* \param mbAddr The current macroblock address.
* \return 0 if macroblock decoding fail, 1 otherwise.
*
* This function extract one macroblock from the bitstream, handle intra/inter
* prediction for its blocks.
*/
int macroblock_layer(DecodingContext_t *dc, const int mbAddr)
{
TRACE_INFO(MB, "<> " BLD_GREEN "macroblock_layer(" CLR_RESET "%i" BLD_GREEN ")\n" CLR_RESET, mbAddr);
int retcode = FAILURE;
// Macroblock allocation
////////////////////////////////////////////////////////////////////////////
dc->mb_array[mbAddr] = (Macroblock_t*)calloc(1, sizeof(Macroblock_t));
if (dc->mb_array[mbAddr] == NULL)
{
TRACE_ERROR(MB, "Unable to alloc new macroblock!\n");
}
else
{
// Set macroblock address
dc->mb_array[mbAddr]->mbAddr = mbAddr;
// Shortcuts
pps_t *pps = dc->pps_array[dc->active_slice->pic_parameter_set_id];
sps_t *sps = dc->sps_array[pps->seq_parameter_set_id];
slice_t *slice = dc->active_slice;
Macroblock_t *mb = dc->mb_array[mbAddr];
// Macroblock decoding
////////////////////////////////////////////////////////////////////////
#if ENABLE_DEBUG
mb->mbFileAddrStart = bitstream_get_absolute_bit_offset(dc->bitstr);
#endif // ENABLE_DEBUG
deriv_macroblockneighbours_availability(dc, mbAddr);
MbPosition(mb, sps);
if (pps->entropy_coding_mode_flag)
mb->mb_type = read_ae(dc, SE_mb_type);
else
mb->mb_type = read_ue(dc->bitstr);
mb->MbPartPredMode[0] = MbPartPredMode(mb, slice->slice_type, 0);
mb->NumMbPart = NumMbPart(slice->slice_type, mb->mb_type);
if (mb->mb_type == I_PCM)
{
#if ENABLE_IPCM
TRACE_3(MB, "---- macroblock_layer - I PCM macroblock\n");
while (bitstream_check_alignment(dc->bitstr) == false)
{
if (read_bit(dc->bitstr) != 0) // pcm_alignment_zero_bit
{
TRACE_ERROR(MB, " Error while reading pcm_alignment_zero_bit: must be 0!\n");
return FAILURE;
}
}
// CABAC initialization process //FIXME needed? See 'ITU-T H.264' recommendation 9.3.1.2
initCabacDecodingEngine(dc);
int i = 0;
for (i = 0; i < 256; i++)
{
mb->pcm_sample_luma[i] = (uint8_t)read_bits(dc->bitstr, sps->BitDepthY);
}
// CABAC initialization process //FIXME needed? See 'ITU-T H.264' recommendation 9.3.1.2
initCabacDecodingEngine(dc);
for (i = 0; i < 2 * sps->MbWidthC * sps->MbHeightC; i++)
{
mb->pcm_sample_chroma[i] = (uint8_t)read_bits(dc->bitstr, sps->BitDepthC);
}
// CABAC initialization process //FIXME needed? See 'ITU-T H.264' recommendation 9.3.1.2
initCabacDecodingEngine(dc);
#else // ENABLE_IPCM
TRACE_ERROR(MB, "I_PCM decoding is currently disabled!\n");
return UNSUPPORTED;
#endif // ENABLE_IPCM
}
else
{
#if ENABLE_INTER_PRED
bool noSubMbPartSizeLessThan8x8Flag = true;
if (mb->mb_type != I_NxN &&
mb->MbPartPredMode[0] != Intra_16x16 &&
mb->NumMbPart == 4)
{
TRACE_3(MB, "---- macroblock_layer - mb partition & related\n");
int mbPartIdx = 0;
for (mbPartIdx = 0; mbPartIdx < 4; mbPartIdx++)
{
if (mb->sub_mb_type[mbPartIdx] != B_Direct_8x8)
{
if (NumSubMbPart(slice->slice_type, mb->sub_mb_type[mbPartIdx]) > 1)
{
noSubMbPartSizeLessThan8x8Flag = false;
}
}
else if (sps->direct_8x8_inference_flag == false)
{
noSubMbPartSizeLessThan8x8Flag = false;
}
}
// Read sub macroblock prediction mode
sub_mb_pred(dc, mb->mb_type, mb->sub_mb_type);
}
else
#endif // ENABLE_INTER_PRED
{
TRACE_3(MB, "---- macroblock_layer - transform_size_8x8_flag & prediction modes\n");
if (pps->transform_8x8_mode_flag == true && mb->mb_type == I_NxN)
{
if (pps->entropy_coding_mode_flag)
mb->transform_size_8x8_flag = read_ae(dc, SE_transform_size_8x8_flag);
else
mb->transform_size_8x8_flag = read_bit(dc->bitstr);
// Need to update MbPartPredMode in order to detect I_8x8 prediction mode
mb->MbPartPredMode[0] = MbPartPredMode(mb, slice->slice_type, 0);
}
// Read macroblock prediction mode
mb_pred(dc, mb);
}
if (mb->MbPartPredMode[0] != Intra_16x16)
{
TRACE_3(MB, "---- macroblock_layer - coded block pattern & transform_size_8x8_flag\n");
if (pps->entropy_coding_mode_flag)
mb->coded_block_pattern = read_ae(dc, SE_coded_block_pattern);
else
mb->coded_block_pattern = read_me(dc->bitstr, sps->ChromaArrayType, dc->IdrPicFlag);
mb->CodedBlockPatternLuma = mb->coded_block_pattern % 16;
mb->CodedBlockPatternChroma = mb->coded_block_pattern / 16;
#if ENABLE_INTER_PRED
if (mb->CodedBlockPatternLuma > 0 &&
pps->transform_8x8_mode_flag == true &&
mb->mb_type != I_NxN &&
noSubMbPartSizeLessThan8x8Flag == true &&
(mb->mb_type != B_Direct_16x16 || sps->direct_8x8_inference_flag == true))
{
if (pps->entropy_coding_mode_flag)
mb->transform_size_8x8_flag = read_ae(dc, SE_transform_size_8x8_flag);
else
mb->transform_size_8x8_flag = read_bit(dc->bitstr);
// Need to update MbPartPredMode in order to account for I_8x8 prediction mode
if (transform_size_8x8_flag)
mb->MbPartPredMode[0] = MbPartPredMode(mb, slice->slice_type, 0);
}
#endif // ENABLE_INTER_PRED
}
if (mb->CodedBlockPatternLuma > 0 ||
mb->CodedBlockPatternChroma > 0 ||
mb->MbPartPredMode[0] == Intra_16x16)
{
TRACE_3(MB, "---- macroblock_layer - quantization parameter & residual datas\n");
// Read QP delta
if (pps->entropy_coding_mode_flag)
mb->mb_qp_delta = read_ae(dc, SE_mb_qp_delta);
else
mb->mb_qp_delta = read_se(dc->bitstr);
// Parse the residual coefficients
////////////////////////////////////////////////////////////////
// Luma levels
residual_luma(dc, 0, 15);
// Chroma levels
residual_chroma(dc, 0, 15);
}
else
{
TRACE_3(MB, "---- macroblock_layer - No residual datas to decode in this macroblock\n");
}
// Compute luma Quantization Parameters
if (mb->mb_qp_delta)
mb->QPY = ((slice->QPYprev + mb->mb_qp_delta + 52 + sps->QpBdOffsetY*2) % (52 + sps->QpBdOffsetY)) - sps->QpBdOffsetY;
else
mb->QPY = slice->QPYprev;
mb->QPprimeY = mb->QPY + sps->QpBdOffsetY;
slice->QPYprev = mb->QPY;
// Set Transform Bypass Mode
if (sps->qpprime_y_zero_transform_bypass_flag == true && mb->QPprimeY == 0)
mb->TransformBypassModeFlag = true;
// Prediction process (include quantization and transformation stages)
////////////////////////////////////////////////////////////////
if (dc->IdrPicFlag)
{
retcode = intra_prediction_process(dc, mb);
}
else
{
retcode = inter_prediction_process(dc, mb);
}
// Print macroblock(s) header and block data ?
////////////////////////////////////////////////////////////////
#if ENABLE_DEBUG
mb->mbFileAddrStop = bitstream_get_absolute_bit_offset(dc->bitstr) - 1;
int frame_debug_range[2] = {-1, -1}; // Range of (idr) frame(s) to debug/analyse
int mb_debug_range[2] = {-1, -1}; // Range of macroblock(s) to debug/analyse
if (dc->idrCounter >= frame_debug_range[0] && dc->idrCounter <= frame_debug_range[1])
{
if (mb->mbAddr >= mb_debug_range[0] && mb->mbAddr <= mb_debug_range[1])
{
print_macroblock_layer(dc, mb);
print_macroblock_pixel_residual(mb);
print_macroblock_pixel_predicted(mb);
print_macroblock_pixel_final(mb);
}
}
#endif // ENABLE_DEBUG
}
TRACE_3(MB, "---- macroblock_layer - the end\n\n");
}
return retcode;
}
/*!
* \param *dc The current DecodingContext.
* \param *slice The current Slice.
* \return 0 if an error occurred while decoding slice datas, 1 otherwise.
*/
static int decodeSliceData(DecodingContext_t *dc, slice_t *slice)
{
TRACE_INFO(SLICE, "> " BLD_GREEN "decodeSliceData()\n" CLR_RESET);
// Initialization
int retcode = SUCCESS;
dc->CurrMbAddr = 0;
slice->moreDataFlag = true;
slice->prevMbSkipped = false;
// Shortcut
pps_t *pps = dc->pps_array[slice->pic_parameter_set_id];
// Slice data decoding
////////////////////////////////////////////////////////////////////////////
if (pps->entropy_coding_mode_flag)
{
// CABAC alignment
while (bitstream_check_alignment(dc->bitstr) == false)
{
if (read_bit(dc->bitstr) == 0) // cabac_alignment_one_bit
{
TRACE_ERROR(SLICE, "cabac_alignment_one_bit must be 1\n");
return FAILURE;
}
}
// CABAC initialization process
initCabacContextVariables(dc);
initCabacDecodingEngine(dc);
}
while ((retcode == SUCCESS) &&
(slice->moreDataFlag == true) &&
(dc->CurrMbAddr < dc->PicSizeInMbs))
{
#if ENABLE_INTER_PRED
// Only I frames are supported anyway
if (slice->slice_type != 2 && slice->slice_type != 7 &&
slice->slice_type != 4 && slice->slice_type != 9) // Not I or SI slice
{
if (pps->entropy_coding_mode_flag)
{
slice->mb_skip_flag = read_ae(dc, SE_mb_skip_flag);
slice->moreDataFlag = !slice->mb_skip_flag;
}
else
{
int i = 0;
slice->mb_skip_run = read_ue(dc->bitstr);
slice->prevMbSkipped = (slice->mb_skip_run > 0);
for (i = 0; i < slice->mb_skip_run; i++)
{
dc->CurrMbAddr = NextMbAddress(dc, dc->CurrMbAddr);
}
if (slice->mb_skip_run > 0)
{
slice->moreDataFlag = h264_more_rbsp_data(dc->bitstr);
}
}
}
// If there is still some data in the slice
if (slice->moreDataFlag)
{
#if ENABLE_MBAFF
if (slice->MbaffFrameFlag == true &&
(dc->CurrMbAddr % 2 == 0 || (dc->CurrMbAddr % 2 == 1 && slice->prevMbSkipped == true)))
{
if (pps->entropy_coding_mode_flag)
slice->mb_field_decoding_flag = read_ae(dc, SE_mb_field_decoding_flag);
else
slice->mb_field_decoding_flag = read_bit(dc->bitstr);
TRACE_ERROR(DSLICE, ">>> UNSUPPORTED (interlaced mode)\n");
return UNSUPPORTED;
}
#endif /* ENABLE_MBAFF */
// Macroblock decoding
retcode = macroblock_layer(dc, dc->CurrMbAddr);
}
#endif /* ENABLE_INTER_PRED */
// Macroblock decoding
retcode = macroblock_layer(dc, dc->CurrMbAddr);
// Check for end of slice
if (pps->entropy_coding_mode_flag)
{
#if ENABLE_INTER_PRED
// Only I frames are supported anyway
if (slice->slice_type != 2 && slice->slice_type != 7 &&
slice->slice_type != 4 && slice->slice_type != 9) // Not I or SI slice
{
slice->prevMbSkipped = slice->mb_skip_flag;
}
#if ENABLE_MBAFF
// MbaffFrameFlag is unsupported, so always "false"
if (slice->MbaffFrameFlag == true && dc->CurrMbAddr % 2 == 0)
{
slice->moreDataFlag = true;
}
else
#endif /* ENABLE_MBAFF */
#endif /* ENABLE_INTER_PRED */
{
slice->end_of_slice_flag = read_ae(dc, SE_end_of_slice_flag);
if (slice->end_of_slice_flag)
{
TRACE_INFO(SLICE, "end_of_slice_flag detected!\n");
slice->moreDataFlag = false;
}
}
}
else
{
slice->moreDataFlag = h264_more_rbsp_data(dc->bitstr);
}
// Get next macroblock address
dc->CurrMbAddr = NextMbAddress(dc, dc->CurrMbAddr);
}
return retcode;
}
