| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2012 Laurent Aimar | ||
| 3 | * | ||
| 4 | * This file is part of FFmpeg. | ||
| 5 | * | ||
| 6 | * FFmpeg is free software; you can redistribute it and/or | ||
| 7 | * modify it under the terms of the GNU Lesser General Public | ||
| 8 | * License as published by the Free Software Foundation; either | ||
| 9 | * version 2.1 of the License, or (at your option) any later version. | ||
| 10 | * | ||
| 11 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 14 | * Lesser General Public License for more details. | ||
| 15 | * | ||
| 16 | * You should have received a copy of the GNU Lesser General Public | ||
| 17 | * License along with FFmpeg; if not, write to the Free Software | ||
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 19 | */ | ||
| 20 | |||
| 21 | #include "libavutil/channel_layout.h" | ||
| 22 | #include "libavutil/intreadwrite.h" | ||
| 23 | #include "avcodec.h" | ||
| 24 | #include "codec_internal.h" | ||
| 25 | #include "decode.h" | ||
| 26 | #include "dvaudio.h" | ||
| 27 | |||
| 28 | typedef struct DVAudioContext { | ||
| 29 | int block_size; | ||
| 30 | int is_12bit; | ||
| 31 | int is_pal; | ||
| 32 | int16_t shuffle[2000]; | ||
| 33 | } DVAudioContext; | ||
| 34 | |||
| 35 | ✗ | static av_cold int decode_init(AVCodecContext *avctx) | |
| 36 | { | ||
| 37 | ✗ | DVAudioContext *s = avctx->priv_data; | |
| 38 | int i; | ||
| 39 | |||
| 40 | ✗ | if (avctx->codec_tag == 0x0215) { | |
| 41 | ✗ | s->block_size = 7200; | |
| 42 | ✗ | } else if (avctx->codec_tag == 0x0216) { | |
| 43 | ✗ | s->block_size = 8640; | |
| 44 | ✗ | } else if (avctx->block_align == 7200 || | |
| 45 | ✗ | avctx->block_align == 8640) { | |
| 46 | ✗ | s->block_size = avctx->block_align; | |
| 47 | } else { | ||
| 48 | ✗ | return AVERROR(EINVAL); | |
| 49 | } | ||
| 50 | |||
| 51 | ✗ | s->is_pal = s->block_size == 8640; | |
| 52 | ✗ | s->is_12bit = avctx->bits_per_coded_sample == 12; | |
| 53 | ✗ | avctx->sample_fmt = AV_SAMPLE_FMT_S16; | |
| 54 | ✗ | av_channel_layout_uninit(&avctx->ch_layout); | |
| 55 | ✗ | avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO; | |
| 56 | |||
| 57 | ✗ | for (i = 0; i < FF_ARRAY_ELEMS(s->shuffle); i++) { | |
| 58 | ✗ | const unsigned a = s->is_pal ? 18 : 15; | |
| 59 | ✗ | const unsigned b = 3 * a; | |
| 60 | |||
| 61 | ✗ | s->shuffle[i] = 80 * ((21 * (i % 3) + 9 * (i / 3) + ((i / a) % 3)) % b) + | |
| 62 | ✗ | (2 + s->is_12bit) * (i / b) + 8; | |
| 63 | } | ||
| 64 | |||
| 65 | ✗ | return 0; | |
| 66 | } | ||
| 67 | |||
| 68 | ✗ | static inline uint16_t dv_audio_12to16(uint16_t sample) | |
| 69 | { | ||
| 70 | uint16_t shift, result; | ||
| 71 | |||
| 72 | ✗ | sample = (sample < 0x800) ? sample : sample | 0xf000; | |
| 73 | ✗ | shift = (sample & 0xf00) >> 8; | |
| 74 | |||
| 75 | ✗ | if (shift < 0x2 || shift > 0xd) { | |
| 76 | ✗ | result = sample; | |
| 77 | ✗ | } else if (shift < 0x8) { | |
| 78 | ✗ | shift--; | |
| 79 | ✗ | result = (sample - (256 * shift)) << shift; | |
| 80 | } else { | ||
| 81 | ✗ | shift = 0xe - shift; | |
| 82 | ✗ | result = ((sample + ((256 * shift) + 1)) << shift) - 1; | |
| 83 | } | ||
| 84 | |||
| 85 | ✗ | return result; | |
| 86 | } | ||
| 87 | |||
| 88 | ✗ | static int decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| 89 | int *got_frame_ptr, AVPacket *pkt) | ||
| 90 | { | ||
| 91 | ✗ | DVAudioContext *s = avctx->priv_data; | |
| 92 | ✗ | const uint8_t *src = pkt->data; | |
| 93 | int16_t *dst; | ||
| 94 | int ret, i; | ||
| 95 | |||
| 96 | ✗ | if (pkt->size < s->block_size) | |
| 97 | ✗ | return AVERROR_INVALIDDATA; | |
| 98 | |||
| 99 | ✗ | frame->nb_samples = dv_get_audio_sample_count(pkt->data + 244, s->is_pal); | |
| 100 | ✗ | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) | |
| 101 | ✗ | return ret; | |
| 102 | ✗ | dst = (int16_t *)frame->data[0]; | |
| 103 | |||
| 104 | ✗ | for (i = 0; i < frame->nb_samples; i++) { | |
| 105 | ✗ | const uint8_t *v = &src[s->shuffle[i]]; | |
| 106 | |||
| 107 | ✗ | if (s->is_12bit) { | |
| 108 | ✗ | *dst++ = dv_audio_12to16((v[0] << 4) | ((v[2] >> 4) & 0x0f)); | |
| 109 | ✗ | *dst++ = dv_audio_12to16((v[1] << 4) | ((v[2] >> 0) & 0x0f)); | |
| 110 | } else { | ||
| 111 | ✗ | *dst++ = AV_RB16(&v[0]); | |
| 112 | ✗ | *dst++ = AV_RB16(&v[s->is_pal ? 4320 : 3600]); | |
| 113 | } | ||
| 114 | } | ||
| 115 | |||
| 116 | ✗ | *got_frame_ptr = 1; | |
| 117 | |||
| 118 | ✗ | return s->block_size; | |
| 119 | } | ||
| 120 | |||
| 121 | const FFCodec ff_dvaudio_decoder = { | ||
| 122 | .p.name = "dvaudio", | ||
| 123 | CODEC_LONG_NAME("Ulead DV Audio"), | ||
| 124 | .p.type = AVMEDIA_TYPE_AUDIO, | ||
| 125 | .p.id = AV_CODEC_ID_DVAUDIO, | ||
| 126 | .init = decode_init, | ||
| 127 | FF_CODEC_DECODE_CB(decode_frame), | ||
| 128 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 129 | .priv_data_size = sizeof(DVAudioContext), | ||
| 130 | }; | ||
| 131 |