LCOV - code coverage report
Current view: top level - libavcodec - aac_adtstoasc_bsf.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 32 65 49.2 %
Date: 2018-05-20 11:54:08 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * MPEG-2/4 AAC ADTS to MPEG-4 Audio Specific Configuration bitstream filter
       3             :  * Copyright (c) 2009 Alex Converse <alex.converse@gmail.com>
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include "adts_header.h"
      23             : #include "adts_parser.h"
      24             : #include "avcodec.h"
      25             : #include "bsf.h"
      26             : #include "put_bits.h"
      27             : #include "get_bits.h"
      28             : #include "mpeg4audio.h"
      29             : #include "internal.h"
      30             : 
      31             : typedef struct AACBSFContext {
      32             :     int first_frame_done;
      33             : } AACBSFContext;
      34             : 
      35             : /**
      36             :  * This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4
      37             :  * ADTS header and removes the ADTS header.
      38             :  */
      39         206 : static int aac_adtstoasc_filter(AVBSFContext *bsfc, AVPacket *pkt)
      40             : {
      41         206 :     AACBSFContext *ctx = bsfc->priv_data;
      42             : 
      43             :     GetBitContext gb;
      44             :     PutBitContext pb;
      45             :     AACADTSHeaderInfo hdr;
      46             :     int ret;
      47             : 
      48         206 :     ret = ff_bsf_get_packet_ref(bsfc, pkt);
      49         206 :     if (ret < 0)
      50          86 :         return ret;
      51             : 
      52         120 :     if (bsfc->par_in->extradata && pkt->size >= 2 && (AV_RB16(pkt->data) >> 4) != 0xfff)
      53           0 :         return 0;
      54             : 
      55         120 :     if (pkt->size < AV_AAC_ADTS_HEADER_SIZE)
      56           0 :         goto packet_too_small;
      57             : 
      58         120 :     init_get_bits(&gb, pkt->data, AV_AAC_ADTS_HEADER_SIZE * 8);
      59             : 
      60         120 :     if (ff_adts_header_parse(&gb, &hdr) < 0) {
      61           0 :         av_log(bsfc, AV_LOG_ERROR, "Error parsing ADTS frame header!\n");
      62           0 :         ret = AVERROR_INVALIDDATA;
      63           0 :         goto fail;
      64             :     }
      65             : 
      66         120 :     if (!hdr.crc_absent && hdr.num_aac_frames > 1) {
      67           0 :         avpriv_report_missing_feature(bsfc,
      68             :                                       "Multiple RDBs per frame with CRC");
      69           0 :         ret = AVERROR_PATCHWELCOME;
      70           0 :         goto fail;
      71             :     }
      72             : 
      73         120 :     pkt->size -= AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
      74         120 :     if (pkt->size <= 0)
      75           0 :         goto packet_too_small;
      76         120 :     pkt->data += AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
      77             : 
      78         120 :     if (!ctx->first_frame_done) {
      79           2 :         int            pce_size = 0;
      80             :         uint8_t        pce_data[MAX_PCE_SIZE];
      81             :         uint8_t       *extradata;
      82             : 
      83           2 :         if (!hdr.chan_config) {
      84           0 :             init_get_bits(&gb, pkt->data, pkt->size * 8);
      85           0 :             if (get_bits(&gb, 3) != 5) {
      86           0 :                 avpriv_report_missing_feature(bsfc,
      87             :                                               "PCE-based channel configuration "
      88             :                                               "without PCE as first syntax "
      89             :                                               "element");
      90           0 :                 ret = AVERROR_PATCHWELCOME;
      91           0 :                 goto fail;
      92             :             }
      93           0 :             init_put_bits(&pb, pce_data, MAX_PCE_SIZE);
      94           0 :             pce_size = ff_copy_pce_data(&pb, &gb) / 8;
      95           0 :             flush_put_bits(&pb);
      96           0 :             pkt->size -= get_bits_count(&gb)/8;
      97           0 :             pkt->data += get_bits_count(&gb)/8;
      98             :         }
      99             : 
     100           2 :         extradata = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
     101             :                                             2 + pce_size);
     102           2 :         if (!extradata) {
     103           0 :             ret = AVERROR(ENOMEM);
     104           0 :             goto fail;
     105             :         }
     106             : 
     107           2 :         init_put_bits(&pb, extradata, 2 + pce_size);
     108           2 :         put_bits(&pb, 5, hdr.object_type);
     109           2 :         put_bits(&pb, 4, hdr.sampling_index);
     110           2 :         put_bits(&pb, 4, hdr.chan_config);
     111           2 :         put_bits(&pb, 1, 0); //frame length - 1024 samples
     112           2 :         put_bits(&pb, 1, 0); //does not depend on core coder
     113           2 :         put_bits(&pb, 1, 0); //is not extension
     114           2 :         flush_put_bits(&pb);
     115           2 :         if (pce_size) {
     116           0 :             memcpy(extradata + 2, pce_data, pce_size);
     117             :         }
     118             : 
     119           2 :         ctx->first_frame_done = 1;
     120             :     }
     121             : 
     122         120 :     return 0;
     123             : 
     124           0 : packet_too_small:
     125           0 :     av_log(bsfc, AV_LOG_ERROR, "Input packet too small\n");
     126           0 :     ret = AVERROR_INVALIDDATA;
     127           0 : fail:
     128           0 :     av_packet_unref(pkt);
     129           0 :     return ret;
     130             : }
     131             : 
     132           2 : static int aac_adtstoasc_init(AVBSFContext *ctx)
     133             : {
     134             :     /* Validate the extradata if the stream is already MPEG-4 AudioSpecificConfig */
     135           2 :     if (ctx->par_in->extradata) {
     136             :         MPEG4AudioConfig mp4ac;
     137           0 :         int ret = avpriv_mpeg4audio_get_config(&mp4ac, ctx->par_in->extradata,
     138           0 :                                                ctx->par_in->extradata_size * 8, 1);
     139           0 :         if (ret < 0) {
     140           0 :             av_log(ctx, AV_LOG_ERROR, "Error parsing AudioSpecificConfig extradata!\n");
     141           0 :             return ret;
     142             :         }
     143             :     }
     144             : 
     145           2 :     return 0;
     146             : }
     147             : 
     148             : static const enum AVCodecID codec_ids[] = {
     149             :     AV_CODEC_ID_AAC, AV_CODEC_ID_NONE,
     150             : };
     151             : 
     152             : const AVBitStreamFilter ff_aac_adtstoasc_bsf = {
     153             :     .name           = "aac_adtstoasc",
     154             :     .priv_data_size = sizeof(AACBSFContext),
     155             :     .init           = aac_adtstoasc_init,
     156             :     .filter         = aac_adtstoasc_filter,
     157             :     .codec_ids      = codec_ids,
     158             : };

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