| /* |
| * codec2 muxer and demuxers |
| * Copyright (c) 2017 Tomas Härdin |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <memory.h> |
| #include "libavcodec/codec2utils.h" |
| #include "libavutil/intreadwrite.h" |
| #include "avio_internal.h" |
| #include "avformat.h" |
| #include "internal.h" |
| #include "rawdec.h" |
| #include "rawenc.h" |
| #include "pcm.h" |
| |
| #define AVPRIV_CODEC2_HEADER_SIZE 7 |
| #define AVPRIV_CODEC2_MAGIC 0xC0DEC2 |
| |
| //the lowest version we should ever run across is 0.8 |
| //we may run across later versions as the format evolves |
| #define EXPECTED_CODEC2_MAJOR_VERSION 0 |
| #define EXPECTED_CODEC2_MINOR_VERSION 8 |
| |
| typedef struct { |
| const AVClass *class; |
| int mode; |
| int frames_per_packet; |
| } Codec2Context; |
| |
| static int codec2_probe(AVProbeData *p) |
| { |
| //must start wih C0 DE C2 |
| if (AV_RB24(p->buf) != AVPRIV_CODEC2_MAGIC) { |
| return 0; |
| } |
| |
| //no .c2 files prior to 0.8 |
| //be strict about major version while we're at it |
| if (p->buf[3] != EXPECTED_CODEC2_MAJOR_VERSION || |
| p->buf[4] < EXPECTED_CODEC2_MINOR_VERSION) { |
| return 0; |
| } |
| |
| //32 bits of identification -> low score |
| return AVPROBE_SCORE_EXTENSION + 1; |
| } |
| |
| static int codec2_read_header_common(AVFormatContext *s, AVStream *st) |
| { |
| int mode = avpriv_codec2_mode_from_extradata(st->codecpar->extradata); |
| |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codecpar->codec_id = AV_CODEC_ID_CODEC2; |
| st->codecpar->sample_rate = 8000; |
| st->codecpar->channels = 1; |
| st->codecpar->format = AV_SAMPLE_FMT_S16; |
| st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; |
| st->codecpar->bit_rate = avpriv_codec2_mode_bit_rate(s, mode); |
| st->codecpar->frame_size = avpriv_codec2_mode_frame_size(s, mode); |
| st->codecpar->block_align = avpriv_codec2_mode_block_align(s, mode); |
| |
| if (st->codecpar->bit_rate <= 0 || |
| st->codecpar->frame_size <= 0 || |
| st->codecpar->block_align <= 0) { |
| return AVERROR_INVALIDDATA; |
| } |
| |
| avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
| |
| return 0; |
| } |
| |
| static int codec2_read_header(AVFormatContext *s) |
| { |
| AVStream *st = avformat_new_stream(s, NULL); |
| int ret, version; |
| |
| if (!st) { |
| return AVERROR(ENOMEM); |
| } |
| |
| if (avio_rb24(s->pb) != AVPRIV_CODEC2_MAGIC) { |
| av_log(s, AV_LOG_ERROR, "not a .c2 file\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| ret = ff_alloc_extradata(st->codecpar, AVPRIV_CODEC2_EXTRADATA_SIZE); |
| if (ret) { |
| return ret; |
| } |
| |
| ret = ffio_read_size(s->pb, st->codecpar->extradata, AVPRIV_CODEC2_EXTRADATA_SIZE); |
| if (ret < 0) { |
| return ret; |
| } |
| |
| version = avpriv_codec2_version_from_extradata(st->codecpar->extradata); |
| if ((version >> 8) != EXPECTED_CODEC2_MAJOR_VERSION) { |
| avpriv_report_missing_feature(s, "Major version %i", version >> 8); |
| return AVERROR_PATCHWELCOME; |
| } |
| |
| s->internal->data_offset = AVPRIV_CODEC2_HEADER_SIZE; |
| |
| return codec2_read_header_common(s, st); |
| } |
| |
| static int codec2_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| Codec2Context *c2 = s->priv_data; |
| AVStream *st = s->streams[0]; |
| int ret, size, n, block_align, frame_size; |
| |
| block_align = st->codecpar->block_align; |
| frame_size = st->codecpar->frame_size; |
| |
| if (block_align <= 0 || frame_size <= 0 || c2->frames_per_packet <= 0) { |
| return AVERROR(EINVAL); |
| } |
| |
| //try to read desired number of frames, compute n from to actual number of bytes read |
| size = c2->frames_per_packet * block_align; |
| ret = av_get_packet(s->pb, pkt, size); |
| if (ret < 0) { |
| return ret; |
| } |
| |
| //only set duration - compute_pkt_fields() and ff_pcm_read_seek() takes care of everything else |
| //tested by spamming the seek functionality in ffplay |
| n = ret / block_align; |
| pkt->duration = n * frame_size; |
| |
| return ret; |
| } |
| |
| static int codec2_write_header(AVFormatContext *s) |
| { |
| AVStream *st; |
| |
| if (s->nb_streams != 1 || s->streams[0]->codecpar->codec_id != AV_CODEC_ID_CODEC2) { |
| av_log(s, AV_LOG_ERROR, ".c2 files must have exactly one codec2 stream\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| st = s->streams[0]; |
| |
| if (st->codecpar->extradata_size != AVPRIV_CODEC2_EXTRADATA_SIZE) { |
| av_log(s, AV_LOG_ERROR, ".c2 files require exactly %i bytes of extradata (got %i)\n", |
| AVPRIV_CODEC2_EXTRADATA_SIZE, st->codecpar->extradata_size); |
| return AVERROR(EINVAL); |
| } |
| |
| avio_wb24(s->pb, AVPRIV_CODEC2_MAGIC); |
| avio_write(s->pb, st->codecpar->extradata, AVPRIV_CODEC2_EXTRADATA_SIZE); |
| |
| return 0; |
| } |
| |
| static int codec2raw_read_header(AVFormatContext *s) |
| { |
| Codec2Context *c2 = s->priv_data; |
| AVStream *st; |
| int ret; |
| |
| if (c2->mode < 0) { |
| //FIXME: using a default value of -1 for mandatory options is an incredibly ugly hack |
| av_log(s, AV_LOG_ERROR, "-mode must be set in order to make sense of raw codec2 files\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) { |
| return AVERROR(ENOMEM); |
| } |
| |
| ret = ff_alloc_extradata(st->codecpar, AVPRIV_CODEC2_EXTRADATA_SIZE); |
| if (ret) { |
| return ret; |
| } |
| |
| s->internal->data_offset = 0; |
| avpriv_codec2_make_extradata(st->codecpar->extradata, c2->mode); |
| |
| return codec2_read_header_common(s, st); |
| } |
| |
| //transcoding report2074.c2 to wav went from 7.391s to 5.322s with -frames_per_packet 1000 compared to default, same sha1sum |
| #define FRAMES_PER_PACKET \ |
| { "frames_per_packet", "Number of frames to read at a time. Higher = faster decoding, lower granularity", \ |
| offsetof(Codec2Context, frames_per_packet), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, AV_OPT_FLAG_DECODING_PARAM} |
| |
| static const AVOption codec2_options[] = { |
| FRAMES_PER_PACKET, |
| { NULL }, |
| }; |
| |
| static const AVOption codec2raw_options[] = { |
| AVPRIV_CODEC2_AVOPTIONS("codec2 mode [mandatory]", Codec2Context, -1, -1, AV_OPT_FLAG_DECODING_PARAM), |
| FRAMES_PER_PACKET, |
| { NULL }, |
| }; |
| |
| static const AVClass codec2_mux_class = { |
| .class_name = "codec2 muxer", |
| .item_name = av_default_item_name, |
| .version = LIBAVUTIL_VERSION_INT, |
| .category = AV_CLASS_CATEGORY_DEMUXER, |
| }; |
| |
| static const AVClass codec2_demux_class = { |
| .class_name = "codec2 demuxer", |
| .item_name = av_default_item_name, |
| .option = codec2_options, |
| .version = LIBAVUTIL_VERSION_INT, |
| .category = AV_CLASS_CATEGORY_DEMUXER, |
| }; |
| |
| static const AVClass codec2raw_demux_class = { |
| .class_name = "codec2raw demuxer", |
| .item_name = av_default_item_name, |
| .option = codec2raw_options, |
| .version = LIBAVUTIL_VERSION_INT, |
| .category = AV_CLASS_CATEGORY_DEMUXER, |
| }; |
| |
| #if CONFIG_CODEC2_DEMUXER |
| AVInputFormat ff_codec2_demuxer = { |
| .name = "codec2", |
| .long_name = NULL_IF_CONFIG_SMALL("codec2 .c2 demuxer"), |
| .priv_data_size = sizeof(Codec2Context), |
| .extensions = "c2", |
| .read_probe = codec2_probe, |
| .read_header = codec2_read_header, |
| .read_packet = codec2_read_packet, |
| .read_seek = ff_pcm_read_seek, |
| .flags = AVFMT_GENERIC_INDEX, |
| .raw_codec_id = AV_CODEC_ID_CODEC2, |
| .priv_class = &codec2_demux_class, |
| }; |
| #endif |
| |
| #if CONFIG_CODEC2_MUXER |
| AVOutputFormat ff_codec2_muxer = { |
| .name = "codec2", |
| .long_name = NULL_IF_CONFIG_SMALL("codec2 .c2 muxer"), |
| .priv_data_size = sizeof(Codec2Context), |
| .extensions = "c2", |
| .audio_codec = AV_CODEC_ID_CODEC2, |
| .video_codec = AV_CODEC_ID_NONE, |
| .write_header = codec2_write_header, |
| .write_packet = ff_raw_write_packet, |
| .flags = AVFMT_NOTIMESTAMPS, |
| .priv_class = &codec2_mux_class, |
| }; |
| #endif |
| |
| #if CONFIG_CODEC2RAW_DEMUXER |
| AVInputFormat ff_codec2raw_demuxer = { |
| .name = "codec2raw", |
| .long_name = NULL_IF_CONFIG_SMALL("raw codec2 demuxer"), |
| .priv_data_size = sizeof(Codec2Context), |
| .read_header = codec2raw_read_header, |
| .read_packet = codec2_read_packet, |
| .read_seek = ff_pcm_read_seek, |
| .flags = AVFMT_GENERIC_INDEX, |
| .raw_codec_id = AV_CODEC_ID_CODEC2, |
| .priv_class = &codec2raw_demux_class, |
| }; |
| #endif |