232 lines
6.5 KiB
C
Executable file
232 lines
6.5 KiB
C
Executable file
/*
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* Microsoft Windows ICO demuxer
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* Copyright (c) 2011 Peter Ross (pross@xvid.org)
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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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/**
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* @file
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* Microsoft Windows ICO demuxer
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*/
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#include "libavutil/intreadwrite.h"
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#include "libavcodec/bytestream.h"
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#include "libavcodec/bmp.h"
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#include "libavcodec/png.h"
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#include "avformat.h"
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#include "internal.h"
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typedef struct {
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int offset;
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int size;
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int nb_pal;
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} IcoImage;
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typedef struct {
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int current_image;
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int nb_images;
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IcoImage * images;
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} IcoDemuxContext;
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static int probe(const AVProbeData *p)
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{
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unsigned i, frames, checked = 0;
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if (p->buf_size < 22 || AV_RL16(p->buf) || AV_RL16(p->buf + 2) != 1)
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return 0;
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frames = AV_RL16(p->buf + 4);
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if (!frames)
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return 0;
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for (i = 0; i < frames && i * 16 + 22 <= p->buf_size; i++) {
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unsigned offset;
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if (AV_RL16(p->buf + 10 + i * 16) & ~1)
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return FFMIN(i, AVPROBE_SCORE_MAX / 4);
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if (p->buf[13 + i * 16])
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return FFMIN(i, AVPROBE_SCORE_MAX / 4);
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if (AV_RL32(p->buf + 14 + i * 16) < 40)
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return FFMIN(i, AVPROBE_SCORE_MAX / 4);
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offset = AV_RL32(p->buf + 18 + i * 16);
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if (offset < 22)
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return FFMIN(i, AVPROBE_SCORE_MAX / 4);
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if (offset > p->buf_size - 8)
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continue;
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if (p->buf[offset] != 40 && AV_RB64(p->buf + offset) != PNGSIG)
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return FFMIN(i, AVPROBE_SCORE_MAX / 4);
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checked++;
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}
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if (checked < frames)
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return AVPROBE_SCORE_MAX / 4 + FFMIN(checked, 1);
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return AVPROBE_SCORE_MAX / 2 + 1;
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}
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static int read_header(AVFormatContext *s)
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{
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IcoDemuxContext *ico = s->priv_data;
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AVIOContext *pb = s->pb;
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int i, codec;
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avio_skip(pb, 4);
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ico->nb_images = avio_rl16(pb);
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if (!ico->nb_images)
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return AVERROR_INVALIDDATA;
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ico->images = av_malloc_array(ico->nb_images, sizeof(IcoImage));
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if (!ico->images)
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return AVERROR(ENOMEM);
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for (i = 0; i < ico->nb_images; i++) {
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AVStream *st;
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int tmp;
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if (avio_seek(pb, 6 + i * 16, SEEK_SET) < 0)
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goto fail;
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st = avformat_new_stream(s, NULL);
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if (!st) {
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av_freep(&ico->images);
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return AVERROR(ENOMEM);
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}
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st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codecpar->width = avio_r8(pb);
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st->codecpar->height = avio_r8(pb);
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ico->images[i].nb_pal = avio_r8(pb);
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if (ico->images[i].nb_pal == 255)
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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);
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if (ico->images[i].size <= 0) {
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av_log(s, AV_LOG_ERROR, "Invalid image size %d\n", ico->images[i].size);
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goto fail;
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}
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ico->images[i].offset = avio_rl32(pb);
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if (avio_seek(pb, ico->images[i].offset, SEEK_SET) < 0)
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goto fail;
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codec = avio_rl32(pb);
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switch (codec) {
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case MKTAG(0x89, 'P', 'N', 'G'):
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st->codecpar->codec_id = AV_CODEC_ID_PNG;
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st->codecpar->width = 0;
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st->codecpar->height = 0;
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break;
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case 40:
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if (ico->images[i].size < 40) {
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goto fail;
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}
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st->codecpar->codec_id = AV_CODEC_ID_BMP;
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tmp = avio_rl32(pb);
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if (tmp)
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st->codecpar->width = tmp;
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tmp = avio_rl32(pb);
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if (tmp)
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st->codecpar->height = tmp / 2;
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break;
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default:
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avpriv_request_sample(s, "codec %d", codec);
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goto fail;
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}
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}
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return 0;
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fail:
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av_freep(&ico->images);
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return AVERROR_INVALIDDATA;
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}
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static int read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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IcoDemuxContext *ico = s->priv_data;
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IcoImage *image;
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AVIOContext *pb = s->pb;
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AVStream *st;
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int ret;
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if (ico->current_image >= ico->nb_images)
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return AVERROR_EOF;
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st = s->streams[0];
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image = &ico->images[ico->current_image];
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if ((ret = avio_seek(pb, image->offset, SEEK_SET)) < 0)
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return ret;
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if (s->streams[ico->current_image]->codecpar->codec_id == AV_CODEC_ID_PNG) {
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if ((ret = av_get_packet(pb, pkt, image->size)) < 0)
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return ret;
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} else {
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uint8_t *buf;
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if ((ret = av_new_packet(pkt, 14 + image->size)) < 0)
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return ret;
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buf = pkt->data;
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/* add BMP header */
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bytestream_put_byte(&buf, 'B');
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bytestream_put_byte(&buf, 'M');
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bytestream_put_le32(&buf, pkt->size);
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bytestream_put_le16(&buf, 0);
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bytestream_put_le16(&buf, 0);
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bytestream_put_le32(&buf, 0);
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if ((ret = avio_read(pb, buf, image->size)) != image->size) {
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return ret < 0 ? ret : AVERROR_INVALIDDATA;
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}
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st->codecpar->bits_per_coded_sample = AV_RL16(buf + 14);
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if (AV_RL32(buf + 32))
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image->nb_pal = AV_RL32(buf + 32);
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if (st->codecpar->bits_per_coded_sample <= 8 && !image->nb_pal) {
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image->nb_pal = 1 << st->codecpar->bits_per_coded_sample;
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AV_WL32(buf + 32, image->nb_pal);
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}
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AV_WL32(buf - 4, 14 + 40 + image->nb_pal * 4);
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AV_WL32(buf + 8, AV_RL32(buf + 8) / 2);
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}
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pkt->stream_index = ico->current_image++;
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pkt->flags |= AV_PKT_FLAG_KEY;
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return 0;
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}
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static int ico_read_close(AVFormatContext * s)
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{
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IcoDemuxContext *ico = s->priv_data;
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av_freep(&ico->images);
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return 0;
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}
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AVInputFormat ff_ico_demuxer = {
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.name = "ico",
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.long_name = NULL_IF_CONFIG_SMALL("Microsoft Windows ICO"),
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.priv_data_size = sizeof(IcoDemuxContext),
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.read_probe = probe,
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.read_header = read_header,
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.read_packet = read_packet,
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.read_close = ico_read_close,
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.flags = AVFMT_NOTIMESTAMPS,
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};
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