0,0 → 1,182 |
/* |
* Microsoft Windows ICO demuxer |
* Copyright (c) 2011 Peter Ross (pross@xvid.org) |
* |
* 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 |
* Microsoft Windows ICO demuxer |
*/ |
|
#include "libavutil/intreadwrite.h" |
#include "libavcodec/bytestream.h" |
#include "libavcodec/bmp.h" |
#include "avformat.h" |
#include "internal.h" |
|
typedef struct { |
int offset; |
int size; |
int nb_pal; |
} IcoImage; |
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typedef struct { |
int current_image; |
int nb_images; |
IcoImage * images; |
} IcoDemuxContext; |
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static int probe(AVProbeData *p) |
{ |
if (AV_RL16(p->buf) == 0 && AV_RL16(p->buf + 2) == 1 && AV_RL16(p->buf + 4)) |
return AVPROBE_SCORE_MAX / 3; |
return 0; |
} |
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static int read_header(AVFormatContext *s) |
{ |
IcoDemuxContext *ico = s->priv_data; |
AVIOContext *pb = s->pb; |
int i, codec; |
|
avio_skip(pb, 4); |
ico->nb_images = avio_rl16(pb); |
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ico->images = av_malloc(ico->nb_images * sizeof(IcoImage)); |
if (!ico->images) |
return AVERROR(ENOMEM); |
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for (i = 0; i < ico->nb_images; i++) { |
AVStream *st; |
int tmp; |
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if (avio_seek(pb, 6 + i * 16, SEEK_SET) < 0) |
break; |
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st = avformat_new_stream(s, NULL); |
if (!st) |
return AVERROR(ENOMEM); |
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
st->codec->width = avio_r8(pb); |
st->codec->height = avio_r8(pb); |
ico->images[i].nb_pal = avio_r8(pb); |
if (ico->images[i].nb_pal == 255) |
ico->images[i].nb_pal = 0; |
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avio_skip(pb, 5); |
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ico->images[i].size = avio_rl32(pb); |
ico->images[i].offset = avio_rl32(pb); |
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if (avio_seek(pb, ico->images[i].offset, SEEK_SET) < 0) |
break; |
|
codec = avio_rl32(pb); |
switch (codec) { |
case MKTAG(0x89, 'P', 'N', 'G'): |
st->codec->codec_id = AV_CODEC_ID_PNG; |
st->codec->width = 0; |
st->codec->height = 0; |
break; |
case 40: |
if (ico->images[i].size < 40) |
return AVERROR_INVALIDDATA; |
st->codec->codec_id = AV_CODEC_ID_BMP; |
tmp = avio_rl32(pb); |
if (tmp) |
st->codec->width = tmp; |
tmp = avio_rl32(pb); |
if (tmp) |
st->codec->height = tmp / 2; |
break; |
default: |
avpriv_request_sample(s, "codec %d", codec); |
return AVERROR_INVALIDDATA; |
} |
} |
|
return 0; |
} |
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static int read_packet(AVFormatContext *s, AVPacket *pkt) |
{ |
IcoDemuxContext *ico = s->priv_data; |
IcoImage *image; |
AVIOContext *pb = s->pb; |
AVStream *st = s->streams[0]; |
int ret; |
|
if (ico->current_image >= ico->nb_images) |
return AVERROR(EIO); |
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image = &ico->images[ico->current_image]; |
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if ((ret = avio_seek(pb, image->offset, SEEK_SET)) < 0) |
return ret; |
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if (s->streams[ico->current_image]->codec->codec_id == AV_CODEC_ID_PNG) { |
if ((ret = av_get_packet(pb, pkt, image->size)) < 0) |
return ret; |
} else { |
uint8_t *buf; |
if ((ret = av_new_packet(pkt, 14 + image->size)) < 0) |
return ret; |
buf = pkt->data; |
|
/* add BMP header */ |
bytestream_put_byte(&buf, 'B'); |
bytestream_put_byte(&buf, 'M'); |
bytestream_put_le32(&buf, pkt->size); |
bytestream_put_le16(&buf, 0); |
bytestream_put_le16(&buf, 0); |
bytestream_put_le32(&buf, 0); |
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if ((ret = avio_read(pb, buf, image->size)) < 0) |
return ret; |
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st->codec->bits_per_coded_sample = AV_RL16(buf + 14); |
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if (AV_RL32(buf + 32)) |
image->nb_pal = AV_RL32(buf + 32); |
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if (st->codec->bits_per_coded_sample <= 8 && !image->nb_pal) { |
image->nb_pal = 1 << st->codec->bits_per_coded_sample; |
AV_WL32(buf + 32, image->nb_pal); |
} |
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AV_WL32(buf - 4, 14 + 40 + image->nb_pal * 4); |
AV_WL32(buf + 8, AV_RL32(buf + 8) / 2); |
} |
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pkt->stream_index = ico->current_image++; |
pkt->flags |= AV_PKT_FLAG_KEY; |
|
return 0; |
} |
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AVInputFormat ff_ico_demuxer = { |
.name = "ico", |
.long_name = NULL_IF_CONFIG_SMALL("Microsoft Windows ICO"), |
.priv_data_size = sizeof(IcoDemuxContext), |
.read_probe = probe, |
.read_header = read_header, |
.read_packet = read_packet, |
.flags = AVFMT_NOTIMESTAMPS, |
}; |