mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
38e5ca9310
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
387 lines
10 KiB
C
387 lines
10 KiB
C
/*
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* MOFLEX demuxer
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* Copyright (c) 2015-2016 Florian Nouwt
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* Copyright (c) 2017 Adib Surani
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* Copyright (c) 2020 Paul B Mahol
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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 "libavcodec/bytestream.h"
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#include "avformat.h"
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#include "internal.h"
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typedef struct BitReader {
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unsigned last;
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unsigned pos;
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} BitReader;
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typedef struct MOFLEXDemuxContext {
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unsigned size;
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int64_t pos;
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int64_t ts;
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int flags;
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int in_block;
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BitReader br;
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} MOFLEXDemuxContext;
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static int pop(BitReader *br, AVIOContext *pb)
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{
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if (avio_feof(pb))
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return AVERROR_EOF;
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if ((br->pos & 7) == 0)
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br->last = (unsigned)avio_r8(pb) << 24U;
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else
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br->last <<= 1;
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br->pos++;
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return !!(br->last & 0x80000000);
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}
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static int pop_int(BitReader *br, AVIOContext *pb, int n)
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{
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int value = 0;
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for (int i = 0; i < n; i++) {
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int ret = pop(br, pb);
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if (ret < 0)
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return ret;
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if (ret > INT_MAX - value - value)
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return AVERROR_INVALIDDATA;
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value = 2 * value + ret;
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}
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return value;
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}
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static int pop_length(BitReader *br, AVIOContext *pb)
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{
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int ret, n = 1;
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while ((ret = pop(br, pb)) == 0)
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n++;
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if (ret < 0)
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return ret;
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return n;
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}
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static int read_var_byte(AVFormatContext *s, unsigned *out)
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{
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AVIOContext *pb = s->pb;
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unsigned value = 0, data;
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data = avio_r8(pb);
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if (!(data & 0x80)) {
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*out = data;
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return 0;
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}
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value = (data & 0x7F) << 7;
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data = avio_r8(pb);
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if (!(data & 0x80)) {
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value |= data;
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*out = value;
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return 0;
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}
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value = ((data & 0x7F) | value) << 7;
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data = avio_r8(pb);
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if (!(data & 0x80)) {
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value |= data;
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*out = value;
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return 0;
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}
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value = (((data & 0x7F) | value) << 7) | avio_r8(pb);
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*out = value;
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return 0;
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}
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static int moflex_probe(const AVProbeData *p)
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{
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GetByteContext gb;
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int score = 0;
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bytestream2_init(&gb, p->buf, p->buf_size);
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if (bytestream2_get_be16(&gb) != 0x4C32)
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return 0;
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score += 10;
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bytestream2_skip(&gb, 10);
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if (bytestream2_get_be16(&gb) == 0)
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return 0;
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score += 5;
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while (bytestream2_get_bytes_left(&gb) > 0) {
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int type = bytestream2_get_byte(&gb);
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int size = bytestream2_get_byte(&gb);
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if (type == 0) {
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score += 5 * (size == 0);
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break;
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}
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if ((type == 1 && size == 12) ||
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(type == 2 && size == 6) ||
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(type == 3 && size == 13) ||
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(type == 4 && size == 2))
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score += 20;
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bytestream2_skip(&gb, size);
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}
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return FFMIN(AVPROBE_SCORE_MAX, score);
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}
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static int moflex_read_sync(AVFormatContext *s)
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{
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MOFLEXDemuxContext *m = s->priv_data;
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AVIOContext *pb = s->pb;
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if (avio_rb16(pb) != 0x4C32) {
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if (avio_feof(pb))
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return AVERROR_EOF;
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avio_seek(pb, -2, SEEK_CUR);
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return 1;
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}
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avio_skip(pb, 2);
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m->ts = avio_rb64(pb);
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m->size = avio_rb16(pb) + 1;
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while (!avio_feof(pb)) {
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unsigned type, ssize, codec_id = 0;
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unsigned codec_type, width = 0, height = 0, sample_rate = 0, channels = 0;
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int stream_index = -1;
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AVRational tb = av_make_q(0, 1);
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read_var_byte(s, &type);
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read_var_byte(s, &ssize);
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switch (type) {
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case 0:
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if (ssize > 0)
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avio_skip(pb, ssize);
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return 0;
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case 2:
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codec_type = AVMEDIA_TYPE_AUDIO;
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stream_index = avio_r8(pb);
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codec_id = avio_r8(pb);
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switch (codec_id) {
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case 0: codec_id = AV_CODEC_ID_FASTAUDIO; break;
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case 1: codec_id = AV_CODEC_ID_ADPCM_IMA_MOFLEX; break;
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case 2: codec_id = AV_CODEC_ID_PCM_S16LE; break;
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default:
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av_log(s, AV_LOG_ERROR, "Unsupported audio codec: %d\n", codec_id);
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return AVERROR_PATCHWELCOME;
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}
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sample_rate = avio_rb24(pb) + 1;
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tb = av_make_q(1, sample_rate);
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channels = avio_r8(pb) + 1;
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break;
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case 1:
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case 3:
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codec_type = AVMEDIA_TYPE_VIDEO;
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stream_index = avio_r8(pb);
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codec_id = avio_r8(pb);
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switch (codec_id) {
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case 0: codec_id = AV_CODEC_ID_MOBICLIP; break;
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default:
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av_log(s, AV_LOG_ERROR, "Unsupported video codec: %d\n", codec_id);
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return AVERROR_PATCHWELCOME;
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}
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tb.den = avio_rb16(pb);
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tb.num = avio_rb16(pb);
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width = avio_rb16(pb);
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height = avio_rb16(pb);
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avio_skip(pb, type == 3 ? 3 : 2);
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break;
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case 4:
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codec_type = AVMEDIA_TYPE_DATA;
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stream_index = avio_r8(pb);
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avio_skip(pb, 1);
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break;
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}
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if (stream_index == s->nb_streams) {
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = codec_type;
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st->codecpar->codec_id = codec_id;
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st->codecpar->width = width;
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st->codecpar->height = height;
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st->codecpar->sample_rate= sample_rate;
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st->codecpar->channels = channels;
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st->priv_data = av_packet_alloc();
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if (!st->priv_data)
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return AVERROR(ENOMEM);
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if (tb.num)
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avpriv_set_pts_info(st, 63, tb.num, tb.den);
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}
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}
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return 0;
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}
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static int moflex_read_header(AVFormatContext *s)
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{
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int ret;
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ret = moflex_read_sync(s);
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if (ret < 0)
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return ret;
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s->ctx_flags |= AVFMTCTX_NOHEADER;
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avio_seek(s->pb, 0, SEEK_SET);
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return 0;
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}
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static int moflex_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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MOFLEXDemuxContext *m = s->priv_data;
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AVIOContext *pb = s->pb;
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BitReader *br = &m->br;
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int ret;
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while (!avio_feof(pb)) {
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if (!m->in_block) {
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m->pos = avio_tell(pb);
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ret = moflex_read_sync(s);
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if (ret < 0)
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return ret;
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m->flags = avio_r8(pb);
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if (m->flags & 2)
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avio_skip(pb, 2);
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}
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while ((avio_tell(pb) < m->pos + m->size) && !avio_feof(pb) && avio_r8(pb)) {
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int stream_index, bits, pkt_size, endframe;
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AVPacket *packet;
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m->in_block = 1;
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avio_seek(pb, -1, SEEK_CUR);
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br->pos = br->last = 0;
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bits = pop_length(br, pb);
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if (bits < 0)
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return bits;
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stream_index = pop_int(br, pb, bits);
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if (stream_index < 0)
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return stream_index;
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if (stream_index >= s->nb_streams)
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return AVERROR_INVALIDDATA;
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endframe = pop(br, pb);
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if (endframe < 0)
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return endframe;
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if (endframe) {
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bits = pop_length(br, pb);
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if (bits < 0)
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return bits;
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pop_int(br, pb, bits);
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pop(br, pb);
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bits = pop_length(br, pb);
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if (bits < 0)
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return bits;
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pop_int(br, pb, bits * 2 + 26);
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}
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pkt_size = pop_int(br, pb, 13) + 1;
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if (pkt_size > m->size)
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return AVERROR_INVALIDDATA;
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packet = s->streams[stream_index]->priv_data;
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if (!packet) {
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avio_skip(pb, pkt_size);
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continue;
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}
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ret = av_append_packet(pb, packet, pkt_size);
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if (ret < 0)
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return ret;
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if (endframe && packet->size > 0) {
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av_packet_move_ref(pkt, packet);
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pkt->pos = m->pos;
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pkt->stream_index = stream_index;
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if (s->streams[stream_index]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
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pkt->duration = 1;
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if (pkt->data[0] & 0x80)
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pkt->flags |= AV_PKT_FLAG_KEY;
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} else {
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pkt->flags |= AV_PKT_FLAG_KEY;
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}
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return ret;
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}
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}
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m->in_block = 0;
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if (m->flags % 2 == 0) {
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if (m->size <= 0)
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return AVERROR_INVALIDDATA;
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avio_seek(pb, m->pos + m->size, SEEK_SET);
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}
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}
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return AVERROR_EOF;
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}
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static int moflex_read_seek(AVFormatContext *s, int stream_index,
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int64_t pts, int flags)
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{
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MOFLEXDemuxContext *m = s->priv_data;
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m->in_block = 0;
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return -1;
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}
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static int moflex_read_close(AVFormatContext *s)
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{
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for (int i = 0; i < s->nb_streams; i++) {
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av_packet_free((AVPacket **)&s->streams[i]->priv_data);
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}
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return 0;
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}
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const AVInputFormat ff_moflex_demuxer = {
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.name = "moflex",
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.long_name = NULL_IF_CONFIG_SMALL("MobiClip MOFLEX"),
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.priv_data_size = sizeof(MOFLEXDemuxContext),
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.read_probe = moflex_probe,
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.read_header = moflex_read_header,
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.read_packet = moflex_read_packet,
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.read_seek = moflex_read_seek,
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.read_close = moflex_read_close,
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.extensions = "moflex",
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.flags = AVFMT_GENERIC_INDEX,
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.flags_internal = FF_FMT_INIT_CLEANUP,
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};
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