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/*
* 4X Technologies .4xm File Demuxer (no muxer) |
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* Copyright (c) 2003 The FFmpeg project |
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* |
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* This file is part of FFmpeg.
*
* 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
* 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
* 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 |
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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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* @file |
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* 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/
*/
|
6a5d31ac |
#include "libavutil/intreadwrite.h" |
3383a53e |
#include "libavutil/intfloat.h" |
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#include "libavcodec/internal.h" |
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#include "avformat.h" |
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#include "internal.h" |
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|
470bce2b |
#define RIFF_TAG MKTAG('R', 'I', 'F', 'F') |
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#define FOURXMV_TAG MKTAG('4', 'X', 'M', 'V') |
470bce2b |
#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', '_') |
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#define vtrk_SIZE 0x44
#define strk_SIZE 0x28
#define GET_LIST_HEADER() \ |
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fourcc_tag = avio_rl32(pb); \ |
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size = avio_rl32(pb); \ |
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if (fourcc_tag != LIST_TAG) \
return AVERROR_INVALIDDATA; \ |
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fourcc_tag = avio_rl32(pb); |
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typedef struct AudioTrack {
int sample_rate;
int bits;
int channels; |
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int stream_index; |
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int adpcm; |
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int64_t audio_pts; |
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} AudioTrack;
typedef struct FourxmDemuxContext { |
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int video_stream_index; |
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int track_count;
AudioTrack *tracks; |
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|
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int64_t video_pts; |
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AVRational fps; |
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} FourxmDemuxContext;
static int fourxm_probe(AVProbeData *p)
{ |
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if ((AV_RL32(&p->buf[0]) != RIFF_TAG) || |
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(AV_RL32(&p->buf[8]) != FOURXMV_TAG)) |
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return 0;
return AVPROBE_SCORE_MAX;
}
|
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static int parse_vtrk(AVFormatContext *s, |
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FourxmDemuxContext *fourxm, uint8_t *buf, int size,
int left) |
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{
AVStream *st;
/* check that there is enough data */ |
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if (size != vtrk_SIZE || left < size + 8) { |
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return AVERROR_INVALIDDATA;
}
/* allocate a new AVStream */
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
|
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avpriv_set_pts_info(st, 60, fourxm->fps.den, fourxm->fps.num); |
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fourxm->video_stream_index = st->index;
|
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = AV_CODEC_ID_4XM; |
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|
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st->codecpar->extradata = av_mallocz(4 + AV_INPUT_BUFFER_PADDING_SIZE);
if (!st->codecpar->extradata) |
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return AVERROR(ENOMEM); |
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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); |
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return 0;
}
static int parse_strk(AVFormatContext *s, |
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FourxmDemuxContext *fourxm, uint8_t *buf, int size,
int left) |
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{
AVStream *st;
int track;
/* check that there is enough data */ |
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if (size != strk_SIZE || left < size + 8) |
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return AVERROR_INVALIDDATA;
track = AV_RL32(buf + 8); |
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if ((unsigned)track >= UINT_MAX / sizeof(AudioTrack) - 1) {
av_log(s, AV_LOG_ERROR, "current_track too large\n");
return AVERROR_INVALIDDATA;
} |
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|
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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;
}
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 || |
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fourxm->tracks[track].channels > FF_SANE_NB_CHANNELS || |
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fourxm->tracks[track].sample_rate <= 0 || |
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fourxm->tracks[track].bits <= 0 ||
fourxm->tracks[track].bits > INT_MAX / FF_SANE_NB_CHANNELS) { |
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av_log(s, AV_LOG_ERROR, "audio header invalid\n");
return AVERROR_INVALIDDATA;
} |
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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;
}
|
e558a634 |
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;
}
|
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/* 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;
|
9200514a |
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_tag = 0;
st->codecpar->channels = fourxm->tracks[track].channels;
st->codecpar->sample_rate = fourxm->tracks[track].sample_rate;
st->codecpar->bits_per_coded_sample = fourxm->tracks[track].bits; |
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st->codecpar->bit_rate = (int64_t)st->codecpar->channels * |
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st->codecpar->sample_rate *
st->codecpar->bits_per_coded_sample;
st->codecpar->block_align = st->codecpar->channels *
st->codecpar->bits_per_coded_sample; |
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if (fourxm->tracks[track].adpcm){ |
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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; |
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} else |
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st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; |
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return 0;
}
|
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static int fourxm_read_header(AVFormatContext *s) |
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{ |
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AVIOContext *pb = s->pb; |
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unsigned int fourcc_tag;
unsigned int size;
int header_size; |
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FourxmDemuxContext *fourxm = s->priv_data; |
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unsigned char *header; |
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int i, ret; |
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fourxm->track_count = 0; |
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fourxm->tracks = NULL; |
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fourxm->fps = (AVRational){1,1}; |
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/* skip the first 3 32-bit numbers */ |
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avio_skip(pb, 12); |
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/* check for LIST-HEAD */
GET_LIST_HEADER();
header_size = size - 4; |
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if (fourcc_tag != HEAD_TAG || header_size < 0) |
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return AVERROR_INVALIDDATA;
/* allocate space for the header and load the whole thing */
header = av_malloc(header_size);
if (!header) |
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return AVERROR(ENOMEM); |
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if (avio_read(pb, header, header_size) != header_size) { |
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av_free(header); |
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return AVERROR(EIO); |
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} |
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/* take the lazy approach and search for any and all vtrk and strk chunks */
for (i = 0; i < header_size - 8; i++) { |
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fourcc_tag = AV_RL32(&header[i]); |
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size = AV_RL32(&header[i + 4]); |
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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);
return AVERROR_INVALIDDATA;
} |
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|
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if (fourcc_tag == std__TAG) { |
42d73f7f |
if (header_size - i < 16) { |
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av_log(s, AV_LOG_ERROR, "std TAG truncated\n"); |
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ret = AVERROR_INVALIDDATA;
goto fail; |
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} |
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fourxm->fps = av_d2q(av_int2float(AV_RL32(&header[i + 12])), 10000); |
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} else if (fourcc_tag == vtrk_TAG) { |
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if ((ret = parse_vtrk(s, fourxm, header + i, size,
header_size - i)) < 0) |
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goto fail; |
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|
a985a940 |
i += 8 + size; |
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} else if (fourcc_tag == strk_TAG) { |
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if ((ret = parse_strk(s, fourxm, header + i, size,
header_size - i)) < 0) |
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goto fail; |
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|
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i += 8 + size; |
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}
}
/* skip over the LIST-MOVI chunk (which is where the stream should be */
GET_LIST_HEADER(); |
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if (fourcc_tag != MOVI_TAG) {
ret = AVERROR_INVALIDDATA; |
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goto fail;
} |
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|
68e1794e |
av_free(header); |
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/* initialize context members */ |
caf5fb95 |
fourxm->video_pts = -1; /* first frame will push to 0 */ |
8e7284ba |
|
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return 0; |
68e1794e |
fail:
av_freep(&fourxm->tracks);
av_free(header);
return ret; |
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}
static int fourxm_read_packet(AVFormatContext *s, |
8e7284ba |
AVPacket *pkt) |
cef4ba9e |
{
FourxmDemuxContext *fourxm = s->priv_data; |
e6496ea7 |
AVIOContext *pb = s->pb; |
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unsigned int fourcc_tag; |
e65ab9d9 |
unsigned int size; |
cef4ba9e |
int ret = 0; |
9913860b |
unsigned int track_number; |
cef4ba9e |
int packet_read = 0; |
8e7284ba |
unsigned char header[8]; |
d66dae57 |
int audio_frame_count; |
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while (!packet_read) { |
e63a3628 |
if ((ret = avio_read(s->pb, header, 8)) < 0) |
8e7284ba |
return ret; |
fead30d4 |
fourcc_tag = AV_RL32(&header[0]); |
e6496ea7 |
size = AV_RL32(&header[4]); |
d34ec64a |
if (avio_feof(pb)) |
6f3e0b21 |
return AVERROR(EIO); |
cef4ba9e |
switch (fourcc_tag) { |
73a19b2d |
case LIST_TAG: |
d66dae57 |
/* this is a good time to bump the video pts */ |
e6496ea7 |
fourxm->video_pts++; |
d66dae57 |
|
73a19b2d |
/* skip the LIST-* tag and move on to the next fourcc */ |
e63a3628 |
avio_rl32(pb); |
73a19b2d |
break;
|
cef4ba9e |
case ifrm_TAG:
case pfrm_TAG: |
07870f85 |
case cfrm_TAG:
case ifr2_TAG:
case pfr2_TAG:
case cfr2_TAG: |
8e7284ba |
/* allocate 8 more bytes than 'size' to account for fourcc
* and size */ |
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if (size + 8 < size || av_new_packet(pkt, size + 8)) |
6f3e0b21 |
return AVERROR(EIO); |
8e7284ba |
pkt->stream_index = fourxm->video_stream_index; |
e6496ea7 |
pkt->pts = fourxm->video_pts;
pkt->pos = avio_tell(s->pb); |
8e7284ba |
memcpy(pkt->data, header, 8); |
e63a3628 |
ret = avio_read(s->pb, &pkt->data[8], size); |
8e7284ba |
|
e6496ea7 |
if (ret < 0) { |
ce70f28a |
av_packet_unref(pkt); |
9b195dd5 |
} else { |
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packet_read = 1; |
9b195dd5 |
av_shrink_packet(pkt, ret + 8);
} |
4a106616 |
break; |
8e7284ba |
|
cef4ba9e |
case snd__TAG: |
e63a3628 |
track_number = avio_rl32(pb); |
e65ab9d9 |
avio_skip(pb, 4); |
e6496ea7 |
size -= 8; |
4b465299 |
|
e6496ea7 |
if (track_number < fourxm->track_count &&
fourxm->tracks[track_number].channels > 0) {
ret = av_get_packet(s->pb, pkt, size);
if (ret < 0) |
6f3e0b21 |
return AVERROR(EIO); |
115329f1 |
pkt->stream_index = |
9913860b |
fourxm->tracks[track_number].stream_index; |
e6496ea7 |
pkt->pts = fourxm->tracks[track_number].audio_pts; |
2692067a |
packet_read = 1; |
8e7284ba |
|
d66dae57 |
/* pts accounting */
audio_frame_count = size; |
9913860b |
if (fourxm->tracks[track_number].adpcm) |
e6496ea7 |
audio_frame_count -= 2 * (fourxm->tracks[track_number].channels);
audio_frame_count /= fourxm->tracks[track_number].channels;
if (fourxm->tracks[track_number].adpcm) { |
d66dae57 |
audio_frame_count *= 2; |
e6496ea7 |
} else |
d66dae57 |
audio_frame_count /= |
e6496ea7 |
(fourxm->tracks[track_number].bits / 8); |
9913860b |
fourxm->tracks[track_number].audio_pts += audio_frame_count; |
cef4ba9e |
} else { |
45a8a02a |
avio_skip(pb, size); |
cef4ba9e |
}
break;
default: |
45a8a02a |
avio_skip(pb, size); |
cef4ba9e |
break;
}
}
return ret;
}
static int fourxm_read_close(AVFormatContext *s)
{ |
e4141433 |
FourxmDemuxContext *fourxm = s->priv_data; |
cef4ba9e |
|
be195ed1 |
av_freep(&fourxm->tracks); |
cef4ba9e |
return 0;
}
|
66355be3 |
AVInputFormat ff_fourxm_demuxer = { |
dfc2c4d9 |
.name = "4xm", |
6774247a |
.long_name = NULL_IF_CONFIG_SMALL("4X Technologies"), |
dfc2c4d9 |
.priv_data_size = sizeof(FourxmDemuxContext),
.read_probe = fourxm_probe,
.read_header = fourxm_read_header,
.read_packet = fourxm_read_packet,
.read_close = fourxm_read_close, |
cef4ba9e |
}; |