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librempeg/libavformat/4xm.c
Andreas Rheinhardt a1a1d49355 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Signed-off-by: Paul B Mahol <onemda@gmail.com>
2024-04-01 19:51:37 +02:00

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/*
* 4X Technologies .4xm File Demuxer (no muxer)
* Copyright (c) 2003 The FFmpeg project
*
* 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
*/
/**
* @file
* 4X Technologies file demuxer
* by Mike Melanson (melanson@pcisys.net)
* for more information on the .4xm file format, visit:
* http://www.pcisys.net/~melanson/codecs/
*/
#include "libavutil/intreadwrite.h"
#include "libavutil/intfloat.h"
#include "libavutil/mem.h"
#include "libavcodec/internal.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#define RIFF_TAG MKTAG('R', 'I', 'F', 'F')
#define FOURXMV_TAG MKTAG('4', 'X', 'M', 'V')
#define LIST_TAG MKTAG('L', 'I', 'S', 'T')
#define HEAD_TAG MKTAG('H', 'E', 'A', 'D')
#define TRK__TAG MKTAG('T', 'R', 'K', '_')
#define MOVI_TAG MKTAG('M', 'O', 'V', 'I')
#define VTRK_TAG MKTAG('V', 'T', 'R', 'K')
#define STRK_TAG MKTAG('S', 'T', 'R', 'K')
#define std__TAG MKTAG('s', 't', 'd', '_')
#define name_TAG MKTAG('n', 'a', 'm', 'e')
#define vtrk_TAG MKTAG('v', 't', 'r', 'k')
#define strk_TAG MKTAG('s', 't', 'r', 'k')
#define ifrm_TAG MKTAG('i', 'f', 'r', 'm')
#define pfrm_TAG MKTAG('p', 'f', 'r', 'm')
#define cfrm_TAG MKTAG('c', 'f', 'r', 'm')
#define ifr2_TAG MKTAG('i', 'f', 'r', '2')
#define pfr2_TAG MKTAG('p', 'f', 'r', '2')
#define cfr2_TAG MKTAG('c', 'f', 'r', '2')
#define snd__TAG MKTAG('s', 'n', 'd', '_')
#define vtrk_SIZE 0x44
#define strk_SIZE 0x28
#define GET_LIST_HEADER() \
fourcc_tag = avio_rl32(pb); \
size = avio_rl32(pb); \
if (fourcc_tag != LIST_TAG) { \
ret = AVERROR_INVALIDDATA; \
goto fail; \
} \
fourcc_tag = avio_rl32(pb);
typedef struct AudioTrack {
int sample_rate;
int bits;
int channels;
int stream_index;
int adpcm;
int64_t audio_pts;
} AudioTrack;
typedef struct FourxmDemuxContext {
int video_stream_index;
int track_count;
AudioTrack *tracks;
int64_t video_pts;
AVRational fps;
} FourxmDemuxContext;
static int fourxm_probe(const AVProbeData *p)
{
if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
(AV_RL32(&p->buf[8]) != FOURXMV_TAG))
return 0;
return AVPROBE_SCORE_MAX;
}
static int parse_vtrk(AVFormatContext *s,
FourxmDemuxContext *fourxm, uint8_t *buf, int size,
int left)
{
AVStream *st;
/* check that there is enough data */
if (size != vtrk_SIZE || left < size + 8) {
return AVERROR_INVALIDDATA;
}
/* allocate a new AVStream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 60, fourxm->fps.den, fourxm->fps.num);
fourxm->video_stream_index = st->index;
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = AV_CODEC_ID_4XM;
st->codecpar->extradata = av_mallocz(4 + AV_INPUT_BUFFER_PADDING_SIZE);
if (!st->codecpar->extradata)
return AVERROR(ENOMEM);
st->codecpar->extradata_size = 4;
AV_WL32(st->codecpar->extradata, AV_RL32(buf + 16));
st->codecpar->width = AV_RL32(buf + 36);
st->codecpar->height = AV_RL32(buf + 40);
return 0;
}
static int parse_strk(AVFormatContext *s,
FourxmDemuxContext *fourxm, uint8_t *buf, int size,
int left)
{
AVStream *st;
int track;
/* check that there is enough data */
if (size != strk_SIZE || left < size + 8)
return AVERROR_INVALIDDATA;
track = AV_RL32(buf + 8);
if ((unsigned)track >= UINT_MAX / sizeof(AudioTrack) - 1 ||
track >= s->max_streams) {
av_log(s, AV_LOG_ERROR, "current_track too large\n");
return AVERROR_INVALIDDATA;
}
if (track + 1 > fourxm->track_count) {
if (av_reallocp_array(&fourxm->tracks, track + 1, sizeof(AudioTrack)))
return AVERROR(ENOMEM);
memset(&fourxm->tracks[fourxm->track_count], 0,
sizeof(AudioTrack) * (track + 1 - fourxm->track_count));
fourxm->track_count = track + 1;
} else {
if (fourxm->tracks[track].bits)
return AVERROR_INVALIDDATA;
}
fourxm->tracks[track].adpcm = AV_RL32(buf + 12);
fourxm->tracks[track].channels = AV_RL32(buf + 36);
fourxm->tracks[track].sample_rate = AV_RL32(buf + 40);
fourxm->tracks[track].bits = AV_RL32(buf + 44);
fourxm->tracks[track].audio_pts = 0;
if (fourxm->tracks[track].channels <= 0 ||
fourxm->tracks[track].channels > FF_SANE_NB_CHANNELS ||
fourxm->tracks[track].sample_rate <= 0 ||
fourxm->tracks[track].bits <= 0 ||
fourxm->tracks[track].bits > INT_MAX / FF_SANE_NB_CHANNELS) {
av_log(s, AV_LOG_ERROR, "audio header invalid\n");
return AVERROR_INVALIDDATA;
}
if (!fourxm->tracks[track].adpcm && fourxm->tracks[track].bits<8) {
av_log(s, AV_LOG_ERROR, "bits unspecified for non ADPCM\n");
return AVERROR_INVALIDDATA;
}
if (fourxm->tracks[track].sample_rate > INT64_MAX / fourxm->tracks[track].bits / fourxm->tracks[track].channels) {
av_log(s, AV_LOG_ERROR, "Overflow during bit rate calculation %d * %d * %d\n",
fourxm->tracks[track].sample_rate, fourxm->tracks[track].bits, fourxm->tracks[track].channels);
return AVERROR_INVALIDDATA;
}
/* allocate a new AVStream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->id = track;
avpriv_set_pts_info(st, 60, 1, fourxm->tracks[track].sample_rate);
fourxm->tracks[track].stream_index = st->index;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_tag = 0;
st->codecpar->ch_layout.nb_channels = fourxm->tracks[track].channels;
st->codecpar->sample_rate = fourxm->tracks[track].sample_rate;
st->codecpar->bits_per_coded_sample = fourxm->tracks[track].bits;
st->codecpar->bit_rate = (int64_t)st->codecpar->ch_layout.nb_channels *
st->codecpar->sample_rate *
st->codecpar->bits_per_coded_sample;
st->codecpar->block_align = st->codecpar->ch_layout.nb_channels *
st->codecpar->bits_per_coded_sample;
if (fourxm->tracks[track].adpcm){
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_4XM;
} else if (st->codecpar->bits_per_coded_sample == 8) {
st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
} else
st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
return 0;
}
static int fourxm_read_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
unsigned int fourcc_tag;
unsigned int size;
int header_size;
FourxmDemuxContext *fourxm = s->priv_data;
unsigned char *header = NULL;
int i, ret;
fourxm->track_count = 0;
fourxm->tracks = NULL;
fourxm->fps = (AVRational){1,1};
fourxm->video_stream_index = -1;
/* skip the first 3 32-bit numbers */
avio_skip(pb, 12);
/* check for LIST-HEAD */
GET_LIST_HEADER();
header_size = size - 4;
if (fourcc_tag != HEAD_TAG || header_size < 0)
return AVERROR_INVALIDDATA;
/* allocate space for the header and load the whole thing */
header = av_malloc(header_size);
if (!header)
return AVERROR(ENOMEM);
if (avio_read(pb, header, header_size) != header_size) {
av_free(header);
return AVERROR(EIO);
}
/* take the lazy approach and search for any and all vtrk and strk chunks */
for (i = 0; i < header_size - 8; i++) {
fourcc_tag = AV_RL32(&header[i]);
size = AV_RL32(&header[i + 4]);
if (size > header_size - i - 8 && (fourcc_tag == vtrk_TAG || fourcc_tag == strk_TAG)) {
av_log(s, AV_LOG_ERROR, "chunk larger than array %d>%d\n", size, header_size - i - 8);
ret = AVERROR_INVALIDDATA;
goto fail;
}
if (fourcc_tag == std__TAG) {
if (header_size - i < 16) {
av_log(s, AV_LOG_ERROR, "std TAG truncated\n");
ret = AVERROR_INVALIDDATA;
goto fail;
}
fourxm->fps = av_d2q(av_int2float(AV_RL32(&header[i + 12])), 10000);
} else if (fourcc_tag == vtrk_TAG) {
if ((ret = parse_vtrk(s, fourxm, header + i, size,
header_size - i)) < 0)
goto fail;
i += 8 + size;
} else if (fourcc_tag == strk_TAG) {
if ((ret = parse_strk(s, fourxm, header + i, size,
header_size - i)) < 0)
goto fail;
i += 8 + size;
}
}
/* skip over the LIST-MOVI chunk (which is where the stream should be */
GET_LIST_HEADER();
if (fourcc_tag != MOVI_TAG) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
av_free(header);
/* initialize context members */
fourxm->video_pts = -1; /* first frame will push to 0 */
return 0;
fail:
av_free(header);
return ret;
}
static int fourxm_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
FourxmDemuxContext *fourxm = s->priv_data;
AVIOContext *pb = s->pb;
unsigned int fourcc_tag;
unsigned int size;
int ret = 0;
unsigned int track_number;
int packet_read = 0;
unsigned char header[8];
int64_t audio_frame_count;
while (!packet_read) {
if ((ret = avio_read(s->pb, header, 8)) < 0)
return ret;
fourcc_tag = AV_RL32(&header[0]);
size = AV_RL32(&header[4]);
if (avio_feof(pb))
return AVERROR(EIO);
switch (fourcc_tag) {
case LIST_TAG:
/* this is a good time to bump the video pts */
fourxm->video_pts++;
/* skip the LIST-* tag and move on to the next fourcc */
avio_rl32(pb);
break;
case ifrm_TAG:
case pfrm_TAG:
case cfrm_TAG:
case ifr2_TAG:
case pfr2_TAG:
case cfr2_TAG:
/* allocate 8 more bytes than 'size' to account for fourcc
* and size */
if (size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE - 8)
return AVERROR_INVALIDDATA;
if (fourxm->video_stream_index < 0)
return AVERROR_INVALIDDATA;
if ((ret = av_new_packet(pkt, size + 8)) < 0)
return ret;
pkt->stream_index = fourxm->video_stream_index;
pkt->pts = fourxm->video_pts;
pkt->pos = avio_tell(s->pb);
memcpy(pkt->data, header, 8);
ret = avio_read(s->pb, &pkt->data[8], size);
if (ret < 0) {
av_packet_unref(pkt);
} else {
packet_read = 1;
av_shrink_packet(pkt, ret + 8);
}
break;
case snd__TAG:
track_number = avio_rl32(pb);
avio_skip(pb, 4);
size -= 8;
if (track_number < fourxm->track_count &&
fourxm->tracks[track_number].channels > 0) {
ret = av_get_packet(s->pb, pkt, size);
if (ret < 0)
return ret;
pkt->stream_index =
fourxm->tracks[track_number].stream_index;
pkt->pts = fourxm->tracks[track_number].audio_pts;
packet_read = 1;
/* pts accounting */
audio_frame_count = size;
if (fourxm->tracks[track_number].adpcm)
audio_frame_count -= 2 * (fourxm->tracks[track_number].channels);
audio_frame_count /= fourxm->tracks[track_number].channels;
if (fourxm->tracks[track_number].adpcm) {
audio_frame_count *= 2;
} else
audio_frame_count /=
(fourxm->tracks[track_number].bits / 8);
fourxm->tracks[track_number].audio_pts += audio_frame_count;
} else {
avio_skip(pb, size);
}
break;
default:
avio_skip(pb, size);
break;
}
}
return ret;
}
static int fourxm_read_close(AVFormatContext *s)
{
FourxmDemuxContext *fourxm = s->priv_data;
av_freep(&fourxm->tracks);
return 0;
}
const FFInputFormat ff_fourxm_demuxer = {
.p.name = "4xm",
.p.long_name = NULL_IF_CONFIG_SMALL("4X Technologies"),
.priv_data_size = sizeof(FourxmDemuxContext),
.flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
.read_probe = fourxm_probe,
.read_header = fourxm_read_header,
.read_packet = fourxm_read_packet,
.read_close = fourxm_read_close,
};
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