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FFmpeg4/libavformat/smush.c

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/*
* LucasArts Smush demuxer
* Copyright (c) 2006 Cyril Zorin
*
* 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 "libavutil/intreadwrite.h"
#include "avformat.h"
#include "avio.h"
#include "internal.h"
typedef struct SMUSHContext {
int version;
int audio_stream_index;
int video_stream_index;
} SMUSHContext;
static int smush_read_probe(const AVProbeData *p)
{
if (((AV_RL32(p->buf) == MKTAG('S', 'A', 'N', 'M') &&
AV_RL32(p->buf + 8) == MKTAG('S', 'H', 'D', 'R')) ||
(AV_RL32(p->buf) == MKTAG('A', 'N', 'I', 'M') &&
AV_RL32(p->buf + 8) == MKTAG('A', 'H', 'D', 'R')))) {
return AVPROBE_SCORE_MAX;
}
return 0;
}
static int smush_read_header(AVFormatContext *ctx)
{
SMUSHContext *smush = ctx->priv_data;
AVIOContext *pb = ctx->pb;
AVStream *vst, *ast;
uint32_t magic, nframes, size, subversion, i;
uint32_t width = 0, height = 0, got_audio = 0, read = 0;
uint32_t sample_rate, channels, palette[256];
int ret;
magic = avio_rb32(pb);
avio_skip(pb, 4); // skip movie size
if (magic == MKBETAG('A', 'N', 'I', 'M')) {
if (avio_rb32(pb) != MKBETAG('A', 'H', 'D', 'R'))
return AVERROR_INVALIDDATA;
size = avio_rb32(pb);
if (size < 3 * 256 + 6)
return AVERROR_INVALIDDATA;
smush->version = 0;
subversion = avio_rl16(pb);
nframes = avio_rl16(pb);
if (!nframes)
return AVERROR_INVALIDDATA;
avio_skip(pb, 2); // skip pad
for (i = 0; i < 256; i++)
palette[i] = avio_rb24(pb);
avio_skip(pb, size - (3 * 256 + 6));
} else if (magic == MKBETAG('S', 'A', 'N', 'M')) {
if (avio_rb32(pb) != MKBETAG('S', 'H', 'D', 'R'))
return AVERROR_INVALIDDATA;
size = avio_rb32(pb);
if (size < 14)
return AVERROR_INVALIDDATA;
smush->version = 1;
subversion = avio_rl16(pb);
nframes = avio_rl32(pb);
if (!nframes)
return AVERROR_INVALIDDATA;
avio_skip(pb, 2); // skip pad
width = avio_rl16(pb);
height = avio_rl16(pb);
avio_skip(pb, 2); // skip pad
avio_skip(pb, size - 14);
if (avio_rb32(pb) != MKBETAG('F', 'L', 'H', 'D'))
return AVERROR_INVALIDDATA;
size = avio_rb32(pb);
while (!got_audio && ((read + 8) < size)) {
uint32_t sig, chunk_size;
if (avio_feof(pb))
return AVERROR_EOF;
sig = avio_rb32(pb);
chunk_size = avio_rb32(pb);
read += 8;
switch (sig) {
case MKBETAG('W', 'a', 'v', 'e'):
got_audio = 1;
sample_rate = avio_rl32(pb);
if (!sample_rate)
return AVERROR_INVALIDDATA;
channels = avio_rl32(pb);
if (!channels)
return AVERROR_INVALIDDATA;
avio_skip(pb, chunk_size - 8);
read += chunk_size;
break;
case MKBETAG('B', 'l', '1', '6'):
case MKBETAG('A', 'N', 'N', 'O'):
avio_skip(pb, chunk_size);
read += chunk_size;
break;
default:
return AVERROR_INVALIDDATA;
}
}
avio_skip(pb, size - read);
} else {
av_log(ctx, AV_LOG_ERROR, "Wrong magic\n");
return AVERROR_INVALIDDATA;
}
vst = avformat_new_stream(ctx, 0);
if (!vst)
return AVERROR(ENOMEM);
smush->video_stream_index = vst->index;
avpriv_set_pts_info(vst, 64, 1, 15);
vst->start_time = 0;
vst->duration =
vst->nb_frames = nframes;
vst->avg_frame_rate = av_inv_q(vst->time_base);
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codecpar->codec_id = AV_CODEC_ID_SANM;
vst->codecpar->codec_tag = 0;
vst->codecpar->width = width;
vst->codecpar->height = height;
if (!smush->version) {
if ((ret = ff_alloc_extradata(vst->codecpar, 1024 + 2)) < 0)
return ret;
AV_WL16(vst->codecpar->extradata, subversion);
for (i = 0; i < 256; i++)
AV_WL32(vst->codecpar->extradata + 2 + i * 4, palette[i]);
}
if (got_audio) {
ast = avformat_new_stream(ctx, 0);
if (!ast)
return AVERROR(ENOMEM);
smush->audio_stream_index = ast->index;
ast->start_time = 0;
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
ast->codecpar->codec_id = AV_CODEC_ID_ADPCM_VIMA;
ast->codecpar->codec_tag = 0;
ast->codecpar->sample_rate = sample_rate;
ast->codecpar->channels = channels;
avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
}
return 0;
}
static int smush_read_packet(AVFormatContext *ctx, AVPacket *pkt)
{
SMUSHContext *smush = ctx->priv_data;
AVIOContext *pb = ctx->pb;
int done = 0;
int ret;
while (!done) {
uint32_t sig, size;
if (avio_feof(pb))
return AVERROR_EOF;
sig = avio_rb32(pb);
size = avio_rb32(pb);
switch (sig) {
case MKBETAG('F', 'R', 'M', 'E'):
if (smush->version)
break;
if ((ret = av_get_packet(pb, pkt, size)) < 0)
return ret;
pkt->stream_index = smush->video_stream_index;
done = 1;
break;
case MKBETAG('B', 'l', '1', '6'):
if ((ret = av_get_packet(pb, pkt, size)) < 0)
return ret;
pkt->stream_index = smush->video_stream_index;
pkt->duration = 1;
done = 1;
break;
case MKBETAG('W', 'a', 'v', 'e'):
if (size < 13)
return AVERROR_INVALIDDATA;
if (av_get_packet(pb, pkt, size) < 13)
return AVERROR(EIO);
pkt->stream_index = smush->audio_stream_index;
pkt->flags |= AV_PKT_FLAG_KEY;
pkt->duration = AV_RB32(pkt->data);
if (pkt->duration == 0xFFFFFFFFu)
pkt->duration = AV_RB32(pkt->data + 8);
done = 1;
break;
default:
avio_skip(pb, size);
break;
}
}
return 0;
}
AVInputFormat ff_smush_demuxer = {
.name = "smush",
.long_name = NULL_IF_CONFIG_SMALL("LucasArts Smush"),
.priv_data_size = sizeof(SMUSHContext),
.read_probe = smush_read_probe,
.read_header = smush_read_header,
.read_packet = smush_read_packet,
};
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