mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-11-25 17:38:23 -05:00
286 lines
8.8 KiB
C
Executable File
286 lines
8.8 KiB
C
Executable File
/*
|
|
* 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(const 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
|