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