1 /* /////////////////////////////////////////////////////////////////////// 2 // 3 // INTEL CORPORATION PROPRIETARY INFORMATION 4 // This software is supplied under the terms of a license agreement or 5 // nondisclosure agreement with Intel Corporation and may not be copied 6 // or disclosed except in accordance with the terms of that agreement. 7 // Copyright (c) 2008 Intel Corporation. All Rights Reserved. 8 // 9 // Description: Parses VC-1 picture layer for simple and main profiles. 10 // 11 */ 12 13 #include "vc1parse.h" 14 15 /*------------------------------------------------------------------------------ 16 * Parse picture layer. This function parses the picture header for simple or 17 * main profile down to macroblock layer. 18 * Table 16 of SMPTE 421M after processing up to PTYPE for I picture. 19 * Table 17 of SMPTE 421M after processing up to PTYPE for BI picture. 20 * Table 19 of SMPTE 421M after processing up to PTYPE for P picture. 21 * Table 21 of SMPTE 421M after processing up to PTYPE for B picture. 22 *------------------------------------------------------------------------------ 23 */ 24 25 vc1_Status vc1_ParsePictureHeader(void* ctxt, vc1_Info *pInfo) 26 { 27 uint32_t tempValue; 28 vc1_Status status = VC1_STATUS_OK; 29 vc1_metadata_t *md = &pInfo->metadata; 30 vc1_PictureLayerHeader *picLayerHeader = &pInfo->picLayerHeader; 31 int32_t result; 32 33 if (md->PROFILE != VC1_PROFILE_ADVANCED) 34 { 35 // As per spec, for main/simple profile, if the size of the coded picture is <= 1B, 36 // it shall be treated as a skipped frame. 37 // In content with skipped frames, the data is "00". 38 // rcv to vc1 conversion process adds an additional byte (0x80) to the picture, hence 39 // the data looks like "00 80" 40 // Hence if data is <= 2B, we will consider it skipped (check for 16+1b, if it fails, the frame is skipped). 41 result = viddec_pm_peek_bits(ctxt, &tempValue, 17); 42 if(result == -1) 43 { 44 picLayerHeader->PTYPE = VC1_SKIPPED_FRAME; 45 return status; 46 } 47 } 48 49 if (md->FINTERPFLAG == 1) 50 { 51 VC1_GET_BITS9(1, tempValue); /* INTERPFRM. */ 52 } 53 54 VC1_GET_BITS9(2, tempValue); /* FRMCNT. */ 55 56 if (md->RANGERED == 1) 57 { 58 VC1_GET_BITS9(1, picLayerHeader->RANGEREDFRM); 59 } 60 61 if (md->MAXBFRAMES == 0) 62 { 63 VC1_GET_BITS9(1, picLayerHeader->PTYPE); 64 if (picLayerHeader->PTYPE == 0) 65 picLayerHeader->PTYPE = VC1_I_FRAME; 66 else 67 picLayerHeader->PTYPE = VC1_P_FRAME; 68 } 69 else 70 { 71 VC1_GET_BITS9(1, picLayerHeader->PTYPE); 72 if (picLayerHeader->PTYPE == 0) 73 { 74 VC1_GET_BITS9(1, picLayerHeader->PTYPE); 75 if (picLayerHeader->PTYPE == 0) { 76 picLayerHeader->PTYPE = VC1_B_FRAME; /* Or VC1_BI_FRAME. */ 77 /* if peek(7) = 0b1111111 then ptype = bi */ 78 VC1_PEEK_BITS( 7, tempValue ); 79 if ( tempValue == 0x7f ) 80 picLayerHeader->PTYPE = VC1_BI_FRAME; 81 } else 82 picLayerHeader->PTYPE = VC1_I_FRAME; 83 } 84 else 85 picLayerHeader->PTYPE = VC1_P_FRAME; 86 } 87 88 if (picLayerHeader->PTYPE == VC1_I_FRAME || 89 picLayerHeader->PTYPE == VC1_BI_FRAME) 90 { 91 status = vc1_ParsePictureHeader_ProgressiveIpicture(ctxt, pInfo); 92 } 93 else if (picLayerHeader->PTYPE == VC1_P_FRAME) 94 status = vc1_ParsePictureHeader_ProgressivePpicture(ctxt, pInfo); 95 else if (picLayerHeader->PTYPE == VC1_B_FRAME) 96 status = vc1_ParsePictureHeader_ProgressiveBpicture(ctxt, pInfo); 97 else 98 status = VC1_STATUS_PARSE_ERROR; 99 100 return status; 101 } 102
