| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2021 Aidan Richmond | ||
| 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 | /** | ||
| 22 | * @file | ||
| 23 | * Westwood Studios AUD file muxer | ||
| 24 | * by Aidan Richmond (aidan.is@hotmail.co.uk) | ||
| 25 | * | ||
| 26 | * This muxer supports IMA ADPCM packed in westwoods format. | ||
| 27 | * | ||
| 28 | * @see http://xhp.xwis.net/documents/aud3.txt | ||
| 29 | */ | ||
| 30 | |||
| 31 | #include "avformat.h" | ||
| 32 | #include "avio_internal.h" | ||
| 33 | #include "internal.h" | ||
| 34 | #include "mux.h" | ||
| 35 | #include <stdint.h> | ||
| 36 | |||
| 37 | #define AUD_CHUNK_SIGNATURE 0x0000DEAF | ||
| 38 | |||
| 39 | typedef struct AUDMuxContext { | ||
| 40 | int uncomp_size; | ||
| 41 | int size; | ||
| 42 | } AUDMuxContext; | ||
| 43 | |||
| 44 | 1 | static int wsaud_write_init(AVFormatContext *ctx) | |
| 45 | { | ||
| 46 | 1 | AVIOContext *pb = ctx->pb; | |
| 47 | |||
| 48 | /* Stream must be seekable to correctly write the file. */ | ||
| 49 |
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1 | if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) { |
| 50 | ✗ | av_log(ctx, AV_LOG_ERROR, "Cannot write Westwood AUD to" | |
| 51 | " non-seekable stream.\n"); | ||
| 52 | ✗ | return AVERROR(EINVAL); | |
| 53 | } | ||
| 54 | |||
| 55 | 1 | return 0; | |
| 56 | } | ||
| 57 | |||
| 58 | 1 | static int wsaud_write_header(AVFormatContext *ctx) | |
| 59 | { | ||
| 60 | 1 | AVStream *st = ctx->streams[0]; | |
| 61 | 1 | AVIOContext *pb = ctx->pb; | |
| 62 | 1 | AUDMuxContext *a = ctx->priv_data; | |
| 63 | 1 | unsigned char flags = 0; | |
| 64 | |||
| 65 | 1 | a->uncomp_size = 0; | |
| 66 | 1 | a->size = 0; | |
| 67 | |||
| 68 | /* Flag if we have stereo data. */ | ||
| 69 |
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1 | if (st->codecpar->ch_layout.nb_channels == 2) |
| 70 | 1 | flags |= 1; | |
| 71 | |||
| 72 | /* This flags that the file contains 16 bit samples rather than 8 bit | ||
| 73 | since the encoder only encodes 16 bit samples this should be set. */ | ||
| 74 |
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1 | if (av_get_bits_per_sample(st->codecpar->codec_id) == 4) |
| 75 | 1 | flags |= 2; | |
| 76 | |||
| 77 | 1 | avio_wl16(pb, st->codecpar->sample_rate); | |
| 78 | /* We don't know the file size yet, so just zero 8 bytes */ | ||
| 79 | 1 | ffio_fill(pb, 0, 8); | |
| 80 | 1 | avio_w8(pb, flags); | |
| 81 | /* 99 indicates the ADPCM format. Other formats not supported. */ | ||
| 82 | 1 | avio_w8(pb, 99); | |
| 83 | |||
| 84 | 1 | return 0; | |
| 85 | } | ||
| 86 | |||
| 87 | 259 | static int wsaud_write_packet(AVFormatContext *ctx, AVPacket *pkt) | |
| 88 | { | ||
| 89 | 259 | AVIOContext *pb = ctx->pb; | |
| 90 | 259 | AUDMuxContext *a = ctx->priv_data; | |
| 91 | |||
| 92 |
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259 | if (pkt->size > UINT16_MAX / 4) |
| 93 | ✗ | return AVERROR_INVALIDDATA; | |
| 94 | /* Assumes ADPCM since this muxer doesn't support SND1 or PCM format. */ | ||
| 95 | 259 | avio_wl16(pb, pkt->size); | |
| 96 | 259 | avio_wl16(pb, pkt->size * 4); | |
| 97 | 259 | avio_wl32(pb, AUD_CHUNK_SIGNATURE); | |
| 98 | 259 | avio_write(pb, pkt->data, pkt->size); | |
| 99 | 259 | a->size += pkt->size + 8; | |
| 100 | 259 | a->uncomp_size += pkt->size * 4; | |
| 101 | |||
| 102 | 259 | return 0; | |
| 103 | } | ||
| 104 | |||
| 105 | 1 | static int wsaud_write_trailer(AVFormatContext *ctx) | |
| 106 | { | ||
| 107 | 1 | AVIOContext *pb = ctx->pb; | |
| 108 | 1 | AUDMuxContext *a = ctx->priv_data; | |
| 109 | |||
| 110 | 1 | avio_seek(pb, 2, SEEK_SET); | |
| 111 | 1 | avio_wl32(pb, a->size); | |
| 112 | 1 | avio_wl32(pb, a->uncomp_size); | |
| 113 | |||
| 114 | 1 | return 0; | |
| 115 | } | ||
| 116 | |||
| 117 | const FFOutputFormat ff_wsaud_muxer = { | ||
| 118 | .p.name = "wsaud", | ||
| 119 | .p.long_name = NULL_IF_CONFIG_SMALL("Westwood Studios audio"), | ||
| 120 | .p.extensions = "aud", | ||
| 121 | .priv_data_size = sizeof(AUDMuxContext), | ||
| 122 | .p.audio_codec = AV_CODEC_ID_ADPCM_IMA_WS, | ||
| 123 | .p.video_codec = AV_CODEC_ID_NONE, | ||
| 124 | .p.subtitle_codec = AV_CODEC_ID_NONE, | ||
| 125 | .init = wsaud_write_init, | ||
| 126 | .write_header = wsaud_write_header, | ||
| 127 | .write_packet = wsaud_write_packet, | ||
| 128 | .write_trailer = wsaud_write_trailer, | ||
| 129 | .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH | | ||
| 130 | FF_OFMT_FLAG_ONLY_DEFAULT_CODECS, | ||
| 131 | }; | ||
| 132 |