| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Raw AC-4 muxer | ||
| 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 "libavcodec/codec_id.h" | ||
| 22 | #include "libavcodec/packet.h" | ||
| 23 | #include "libavutil/crc.h" | ||
| 24 | #include "libavutil/opt.h" | ||
| 25 | #include "avformat.h" | ||
| 26 | #include "mux.h" | ||
| 27 | |||
| 28 | typedef struct AC4Context { | ||
| 29 | AVClass *class; | ||
| 30 | int write_crc; | ||
| 31 | } AC4Context; | ||
| 32 | |||
| 33 | ✗ | static int ac4_write_packet(AVFormatContext *s, AVPacket *pkt) | |
| 34 | { | ||
| 35 | ✗ | AC4Context *ac4 = s->priv_data; | |
| 36 | ✗ | AVIOContext *pb = s->pb; | |
| 37 | |||
| 38 | ✗ | if (!pkt->size) | |
| 39 | ✗ | return 0; | |
| 40 | |||
| 41 | ✗ | if (ac4->write_crc) | |
| 42 | ✗ | avio_wb16(pb, 0xAC41); | |
| 43 | else | ||
| 44 | ✗ | avio_wb16(pb, 0xAC40); | |
| 45 | |||
| 46 | ✗ | if (pkt->size >= 0xffff) { | |
| 47 | ✗ | avio_wb16(pb, 0xffff); | |
| 48 | ✗ | avio_wb24(pb, pkt->size); | |
| 49 | } else { | ||
| 50 | ✗ | avio_wb16(pb, pkt->size); | |
| 51 | } | ||
| 52 | |||
| 53 | ✗ | avio_write(pb, pkt->data, pkt->size); | |
| 54 | |||
| 55 | ✗ | if (ac4->write_crc) { | |
| 56 | ✗ | uint16_t crc = av_crc(av_crc_get_table(AV_CRC_16_ANSI), 0, pkt->data, pkt->size); | |
| 57 | ✗ | avio_wl16(pb, crc); | |
| 58 | } | ||
| 59 | |||
| 60 | ✗ | return 0; | |
| 61 | } | ||
| 62 | |||
| 63 | #define ENC AV_OPT_FLAG_ENCODING_PARAM | ||
| 64 | #define OFFSET(obj) offsetof(AC4Context, obj) | ||
| 65 | static const AVOption ac4_options[] = { | ||
| 66 | { "write_crc", "enable checksum", OFFSET(write_crc), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC}, | ||
| 67 | { NULL }, | ||
| 68 | }; | ||
| 69 | |||
| 70 | static const AVClass ac4_muxer_class = { | ||
| 71 | .class_name = "AC4 muxer", | ||
| 72 | .item_name = av_default_item_name, | ||
| 73 | .option = ac4_options, | ||
| 74 | .version = LIBAVUTIL_VERSION_INT, | ||
| 75 | }; | ||
| 76 | |||
| 77 | const FFOutputFormat ff_ac4_muxer = { | ||
| 78 | .p.name = "ac4", | ||
| 79 | .p.long_name = NULL_IF_CONFIG_SMALL("raw AC-4"), | ||
| 80 | .p.mime_type = "audio/ac4", | ||
| 81 | .p.extensions = "ac4", | ||
| 82 | .priv_data_size = sizeof(AC4Context), | ||
| 83 | .p.audio_codec = AV_CODEC_ID_AC4, | ||
| 84 | .p.video_codec = AV_CODEC_ID_NONE, | ||
| 85 | .p.subtitle_codec = AV_CODEC_ID_NONE, | ||
| 86 | .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH | | ||
| 87 | FF_OFMT_FLAG_ONLY_DEFAULT_CODECS, | ||
| 88 | .write_packet = ac4_write_packet, | ||
| 89 | .p.priv_class = &ac4_muxer_class, | ||
| 90 | .p.flags = AVFMT_NOTIMESTAMPS, | ||
| 91 | }; | ||
| 92 |