mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-11 01:25:25 +00:00
38e5ca9310
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
387 lines
10 KiB
C
387 lines
10 KiB
C
/*
|
|
* MOFLEX demuxer
|
|
* Copyright (c) 2015-2016 Florian Nouwt
|
|
* Copyright (c) 2017 Adib Surani
|
|
* Copyright (c) 2020 Paul B Mahol
|
|
*
|
|
* 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 "libavcodec/bytestream.h"
|
|
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
|
|
typedef struct BitReader {
|
|
unsigned last;
|
|
unsigned pos;
|
|
} BitReader;
|
|
|
|
typedef struct MOFLEXDemuxContext {
|
|
unsigned size;
|
|
int64_t pos;
|
|
int64_t ts;
|
|
int flags;
|
|
int in_block;
|
|
|
|
BitReader br;
|
|
} MOFLEXDemuxContext;
|
|
|
|
static int pop(BitReader *br, AVIOContext *pb)
|
|
{
|
|
if (avio_feof(pb))
|
|
return AVERROR_EOF;
|
|
|
|
if ((br->pos & 7) == 0)
|
|
br->last = (unsigned)avio_r8(pb) << 24U;
|
|
else
|
|
br->last <<= 1;
|
|
|
|
br->pos++;
|
|
return !!(br->last & 0x80000000);
|
|
}
|
|
|
|
static int pop_int(BitReader *br, AVIOContext *pb, int n)
|
|
{
|
|
int value = 0;
|
|
|
|
for (int i = 0; i < n; i++) {
|
|
int ret = pop(br, pb);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret > INT_MAX - value - value)
|
|
return AVERROR_INVALIDDATA;
|
|
value = 2 * value + ret;
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
static int pop_length(BitReader *br, AVIOContext *pb)
|
|
{
|
|
int ret, n = 1;
|
|
|
|
while ((ret = pop(br, pb)) == 0)
|
|
n++;
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
return n;
|
|
}
|
|
|
|
static int read_var_byte(AVFormatContext *s, unsigned *out)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
unsigned value = 0, data;
|
|
|
|
data = avio_r8(pb);
|
|
if (!(data & 0x80)) {
|
|
*out = data;
|
|
return 0;
|
|
}
|
|
|
|
value = (data & 0x7F) << 7;
|
|
data = avio_r8(pb);
|
|
if (!(data & 0x80)) {
|
|
value |= data;
|
|
*out = value;
|
|
return 0;
|
|
}
|
|
|
|
value = ((data & 0x7F) | value) << 7;
|
|
data = avio_r8(pb);
|
|
if (!(data & 0x80)) {
|
|
value |= data;
|
|
*out = value;
|
|
return 0;
|
|
}
|
|
|
|
value = (((data & 0x7F) | value) << 7) | avio_r8(pb);
|
|
*out = value;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int moflex_probe(const AVProbeData *p)
|
|
{
|
|
GetByteContext gb;
|
|
int score = 0;
|
|
|
|
bytestream2_init(&gb, p->buf, p->buf_size);
|
|
|
|
if (bytestream2_get_be16(&gb) != 0x4C32)
|
|
return 0;
|
|
score += 10;
|
|
|
|
bytestream2_skip(&gb, 10);
|
|
if (bytestream2_get_be16(&gb) == 0)
|
|
return 0;
|
|
score += 5;
|
|
|
|
while (bytestream2_get_bytes_left(&gb) > 0) {
|
|
int type = bytestream2_get_byte(&gb);
|
|
int size = bytestream2_get_byte(&gb);
|
|
|
|
if (type == 0) {
|
|
score += 5 * (size == 0);
|
|
break;
|
|
}
|
|
if ((type == 1 && size == 12) ||
|
|
(type == 2 && size == 6) ||
|
|
(type == 3 && size == 13) ||
|
|
(type == 4 && size == 2))
|
|
score += 20;
|
|
bytestream2_skip(&gb, size);
|
|
}
|
|
|
|
return FFMIN(AVPROBE_SCORE_MAX, score);
|
|
}
|
|
|
|
static int moflex_read_sync(AVFormatContext *s)
|
|
{
|
|
MOFLEXDemuxContext *m = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
|
|
if (avio_rb16(pb) != 0x4C32) {
|
|
if (avio_feof(pb))
|
|
return AVERROR_EOF;
|
|
avio_seek(pb, -2, SEEK_CUR);
|
|
return 1;
|
|
}
|
|
|
|
avio_skip(pb, 2);
|
|
m->ts = avio_rb64(pb);
|
|
m->size = avio_rb16(pb) + 1;
|
|
|
|
while (!avio_feof(pb)) {
|
|
unsigned type, ssize, codec_id = 0;
|
|
unsigned codec_type, width = 0, height = 0, sample_rate = 0, channels = 0;
|
|
int stream_index = -1;
|
|
AVRational tb = av_make_q(0, 1);
|
|
|
|
read_var_byte(s, &type);
|
|
read_var_byte(s, &ssize);
|
|
|
|
switch (type) {
|
|
case 0:
|
|
if (ssize > 0)
|
|
avio_skip(pb, ssize);
|
|
return 0;
|
|
case 2:
|
|
codec_type = AVMEDIA_TYPE_AUDIO;
|
|
stream_index = avio_r8(pb);
|
|
codec_id = avio_r8(pb);
|
|
switch (codec_id) {
|
|
case 0: codec_id = AV_CODEC_ID_FASTAUDIO; break;
|
|
case 1: codec_id = AV_CODEC_ID_ADPCM_IMA_MOFLEX; break;
|
|
case 2: codec_id = AV_CODEC_ID_PCM_S16LE; break;
|
|
default:
|
|
av_log(s, AV_LOG_ERROR, "Unsupported audio codec: %d\n", codec_id);
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
sample_rate = avio_rb24(pb) + 1;
|
|
tb = av_make_q(1, sample_rate);
|
|
channels = avio_r8(pb) + 1;
|
|
break;
|
|
case 1:
|
|
case 3:
|
|
codec_type = AVMEDIA_TYPE_VIDEO;
|
|
stream_index = avio_r8(pb);
|
|
codec_id = avio_r8(pb);
|
|
switch (codec_id) {
|
|
case 0: codec_id = AV_CODEC_ID_MOBICLIP; break;
|
|
default:
|
|
av_log(s, AV_LOG_ERROR, "Unsupported video codec: %d\n", codec_id);
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
tb.den = avio_rb16(pb);
|
|
tb.num = avio_rb16(pb);
|
|
width = avio_rb16(pb);
|
|
height = avio_rb16(pb);
|
|
avio_skip(pb, type == 3 ? 3 : 2);
|
|
break;
|
|
case 4:
|
|
codec_type = AVMEDIA_TYPE_DATA;
|
|
stream_index = avio_r8(pb);
|
|
avio_skip(pb, 1);
|
|
break;
|
|
}
|
|
|
|
if (stream_index == s->nb_streams) {
|
|
AVStream *st = avformat_new_stream(s, NULL);
|
|
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
st->codecpar->codec_type = codec_type;
|
|
st->codecpar->codec_id = codec_id;
|
|
st->codecpar->width = width;
|
|
st->codecpar->height = height;
|
|
st->codecpar->sample_rate= sample_rate;
|
|
st->codecpar->channels = channels;
|
|
st->priv_data = av_packet_alloc();
|
|
if (!st->priv_data)
|
|
return AVERROR(ENOMEM);
|
|
|
|
if (tb.num)
|
|
avpriv_set_pts_info(st, 63, tb.num, tb.den);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int moflex_read_header(AVFormatContext *s)
|
|
{
|
|
int ret;
|
|
|
|
ret = moflex_read_sync(s);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
s->ctx_flags |= AVFMTCTX_NOHEADER;
|
|
avio_seek(s->pb, 0, SEEK_SET);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int moflex_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
MOFLEXDemuxContext *m = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
BitReader *br = &m->br;
|
|
int ret;
|
|
|
|
while (!avio_feof(pb)) {
|
|
if (!m->in_block) {
|
|
m->pos = avio_tell(pb);
|
|
|
|
ret = moflex_read_sync(s);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
m->flags = avio_r8(pb);
|
|
if (m->flags & 2)
|
|
avio_skip(pb, 2);
|
|
}
|
|
|
|
while ((avio_tell(pb) < m->pos + m->size) && !avio_feof(pb) && avio_r8(pb)) {
|
|
int stream_index, bits, pkt_size, endframe;
|
|
AVPacket *packet;
|
|
|
|
m->in_block = 1;
|
|
|
|
avio_seek(pb, -1, SEEK_CUR);
|
|
br->pos = br->last = 0;
|
|
|
|
bits = pop_length(br, pb);
|
|
if (bits < 0)
|
|
return bits;
|
|
stream_index = pop_int(br, pb, bits);
|
|
if (stream_index < 0)
|
|
return stream_index;
|
|
if (stream_index >= s->nb_streams)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
endframe = pop(br, pb);
|
|
if (endframe < 0)
|
|
return endframe;
|
|
if (endframe) {
|
|
bits = pop_length(br, pb);
|
|
if (bits < 0)
|
|
return bits;
|
|
pop_int(br, pb, bits);
|
|
pop(br, pb);
|
|
bits = pop_length(br, pb);
|
|
if (bits < 0)
|
|
return bits;
|
|
pop_int(br, pb, bits * 2 + 26);
|
|
}
|
|
|
|
pkt_size = pop_int(br, pb, 13) + 1;
|
|
if (pkt_size > m->size)
|
|
return AVERROR_INVALIDDATA;
|
|
packet = s->streams[stream_index]->priv_data;
|
|
if (!packet) {
|
|
avio_skip(pb, pkt_size);
|
|
continue;
|
|
}
|
|
|
|
ret = av_append_packet(pb, packet, pkt_size);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (endframe && packet->size > 0) {
|
|
av_packet_move_ref(pkt, packet);
|
|
pkt->pos = m->pos;
|
|
pkt->stream_index = stream_index;
|
|
if (s->streams[stream_index]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
|
|
pkt->duration = 1;
|
|
if (pkt->data[0] & 0x80)
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
} else {
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
}
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
m->in_block = 0;
|
|
|
|
if (m->flags % 2 == 0) {
|
|
if (m->size <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
avio_seek(pb, m->pos + m->size, SEEK_SET);
|
|
}
|
|
}
|
|
|
|
return AVERROR_EOF;
|
|
}
|
|
|
|
static int moflex_read_seek(AVFormatContext *s, int stream_index,
|
|
int64_t pts, int flags)
|
|
{
|
|
MOFLEXDemuxContext *m = s->priv_data;
|
|
|
|
m->in_block = 0;
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int moflex_read_close(AVFormatContext *s)
|
|
{
|
|
for (int i = 0; i < s->nb_streams; i++) {
|
|
av_packet_free((AVPacket **)&s->streams[i]->priv_data);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
const AVInputFormat ff_moflex_demuxer = {
|
|
.name = "moflex",
|
|
.long_name = NULL_IF_CONFIG_SMALL("MobiClip MOFLEX"),
|
|
.priv_data_size = sizeof(MOFLEXDemuxContext),
|
|
.read_probe = moflex_probe,
|
|
.read_header = moflex_read_header,
|
|
.read_packet = moflex_read_packet,
|
|
.read_seek = moflex_read_seek,
|
|
.read_close = moflex_read_close,
|
|
.extensions = "moflex",
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
.flags_internal = FF_FMT_INIT_CLEANUP,
|
|
};
|