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4349 | Serge | 1 | /* |
2 | * Common AAC and AC-3 parser |
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3 | * Copyright (c) 2003 Fabrice Bellard |
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4 | * Copyright (c) 2003 Michael Niedermayer |
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5 | * |
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6 | * This file is part of FFmpeg. |
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7 | * |
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8 | * FFmpeg is free software; you can redistribute it and/or |
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9 | * modify it under the terms of the GNU Lesser General Public |
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10 | * License as published by the Free Software Foundation; either |
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11 | * version 2.1 of the License, or (at your option) any later version. |
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12 | * |
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13 | * FFmpeg is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 | * Lesser General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU Lesser General Public |
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19 | * License along with FFmpeg; if not, write to the Free Software |
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20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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21 | */ |
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22 | |||
23 | #include "libavutil/common.h" |
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24 | #include "parser.h" |
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25 | #include "aac_ac3_parser.h" |
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26 | |||
27 | int ff_aac_ac3_parse(AVCodecParserContext *s1, |
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28 | AVCodecContext *avctx, |
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29 | const uint8_t **poutbuf, int *poutbuf_size, |
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30 | const uint8_t *buf, int buf_size) |
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31 | { |
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32 | AACAC3ParseContext *s = s1->priv_data; |
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33 | ParseContext *pc = &s->pc; |
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34 | int len, i; |
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35 | int new_frame_start; |
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36 | |||
37 | get_next: |
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38 | i=END_NOT_FOUND; |
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39 | if(s->remaining_size <= buf_size){ |
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40 | if(s->remaining_size && !s->need_next_header){ |
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41 | i= s->remaining_size; |
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42 | s->remaining_size = 0; |
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43 | }else{ //we need a header first |
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44 | len=0; |
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45 | for(i=s->remaining_size; i |
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46 | s->state = (s->state<<8) + buf[i]; |
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47 | if((len=s->sync(s->state, s, &s->need_next_header, &new_frame_start))) |
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48 | break; |
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49 | } |
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50 | if(len<=0){ |
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51 | i=END_NOT_FOUND; |
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52 | }else{ |
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53 | s->state=0; |
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54 | i-= s->header_size -1; |
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55 | s->remaining_size = len; |
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56 | if(!new_frame_start || pc->index+i<=0){ |
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57 | s->remaining_size += i; |
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58 | goto get_next; |
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59 | } |
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60 | } |
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61 | } |
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62 | } |
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63 | |||
64 | if(ff_combine_frame(pc, i, &buf, &buf_size)<0){ |
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65 | s->remaining_size -= FFMIN(s->remaining_size, buf_size); |
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66 | *poutbuf = NULL; |
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67 | *poutbuf_size = 0; |
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68 | return buf_size; |
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69 | } |
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70 | |||
71 | *poutbuf = buf; |
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72 | *poutbuf_size = buf_size; |
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73 | |||
74 | /* update codec info */ |
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75 | if(s->codec_id) |
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76 | avctx->codec_id = s->codec_id; |
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77 | |||
78 | /* Due to backwards compatible HE-AAC the sample rate, channel count, |
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79 | and total number of samples found in an AAC ADTS header are not |
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80 | reliable. Bit rate is still accurate because the total frame duration in |
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81 | seconds is still correct (as is the number of bits in the frame). */ |
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82 | if (avctx->codec_id != AV_CODEC_ID_AAC) { |
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83 | avctx->sample_rate = s->sample_rate; |
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84 | |||
85 | /* allow downmixing to stereo (or mono for AC-3) */ |
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86 | if(avctx->request_channels > 0 && |
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87 | avctx->request_channels < s->channels && |
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88 | (avctx->request_channels <= 2 || |
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89 | (avctx->request_channels == 1 && |
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90 | (avctx->codec_id == AV_CODEC_ID_AC3 || |
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91 | avctx->codec_id == AV_CODEC_ID_EAC3)))) { |
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92 | avctx->channels = avctx->request_channels; |
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93 | } else { |
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94 | avctx->channels = s->channels; |
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95 | avctx->channel_layout = s->channel_layout; |
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96 | } |
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97 | s1->duration = s->samples; |
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98 | avctx->audio_service_type = s->service_type; |
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99 | } |
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100 | |||
101 | avctx->bit_rate = s->bit_rate; |
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102 | |||
103 | return i; |
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104 | }=>>0){ |