| /* |
| * 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 "libavcodec/png.h" |
| #include "avformat.h" |
| #include "internal.h" |
| |
| typedef struct { |
| int offset; |
| int size; |
| int nb_pal; |
| } IcoImage; |
| |
| typedef struct { |
| int current_image; |
| int nb_images; |
| IcoImage * images; |
| } IcoDemuxContext; |
| |
| static int probe(const AVProbeData *p) |
| { |
| unsigned i, frames, checked = 0; |
| |
| if (p->buf_size < 22 || AV_RL16(p->buf) || AV_RL16(p->buf + 2) != 1) |
| return 0; |
| frames = AV_RL16(p->buf + 4); |
| if (!frames) |
| return 0; |
| for (i = 0; i < frames && i * 16 + 22 <= p->buf_size; i++) { |
| unsigned offset; |
| if (AV_RL16(p->buf + 10 + i * 16) & ~1) |
| return FFMIN(i, AVPROBE_SCORE_MAX / 4); |
| if (p->buf[13 + i * 16]) |
| return FFMIN(i, AVPROBE_SCORE_MAX / 4); |
| if (AV_RL32(p->buf + 14 + i * 16) < 40) |
| return FFMIN(i, AVPROBE_SCORE_MAX / 4); |
| offset = AV_RL32(p->buf + 18 + i * 16); |
| if (offset < 22) |
| return FFMIN(i, AVPROBE_SCORE_MAX / 4); |
| if (offset > p->buf_size - 8) |
| continue; |
| if (p->buf[offset] != 40 && AV_RB64(p->buf + offset) != PNGSIG) |
| return FFMIN(i, AVPROBE_SCORE_MAX / 4); |
| checked++; |
| } |
| |
| if (checked < frames) |
| return AVPROBE_SCORE_MAX / 4 + FFMIN(checked, 1); |
| return AVPROBE_SCORE_MAX / 2 + 1; |
| } |
| |
| 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); |
| |
| if (!ico->nb_images) |
| return AVERROR_INVALIDDATA; |
| |
| ico->images = av_malloc_array(ico->nb_images, sizeof(IcoImage)); |
| if (!ico->images) |
| return AVERROR(ENOMEM); |
| |
| for (i = 0; i < ico->nb_images; i++) { |
| AVStream *st; |
| int tmp; |
| |
| if (avio_seek(pb, 6 + i * 16, SEEK_SET) < 0) |
| goto fail; |
| |
| st = avformat_new_stream(s, NULL); |
| if (!st) { |
| av_freep(&ico->images); |
| return AVERROR(ENOMEM); |
| } |
| |
| st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
| st->codecpar->width = avio_r8(pb); |
| st->codecpar->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; |
| |
| avio_skip(pb, 5); |
| |
| ico->images[i].size = avio_rl32(pb); |
| if (ico->images[i].size <= 0) { |
| av_log(s, AV_LOG_ERROR, "Invalid image size %d\n", ico->images[i].size); |
| goto fail; |
| } |
| ico->images[i].offset = avio_rl32(pb); |
| |
| if (avio_seek(pb, ico->images[i].offset, SEEK_SET) < 0) |
| goto fail; |
| |
| codec = avio_rl32(pb); |
| switch (codec) { |
| case MKTAG(0x89, 'P', 'N', 'G'): |
| st->codecpar->codec_id = AV_CODEC_ID_PNG; |
| st->codecpar->width = 0; |
| st->codecpar->height = 0; |
| break; |
| case 40: |
| if (ico->images[i].size < 40) { |
| goto fail; |
| } |
| st->codecpar->codec_id = AV_CODEC_ID_BMP; |
| tmp = avio_rl32(pb); |
| if (tmp) |
| st->codecpar->width = tmp; |
| tmp = avio_rl32(pb); |
| if (tmp) |
| st->codecpar->height = tmp / 2; |
| break; |
| default: |
| avpriv_request_sample(s, "codec %d", codec); |
| goto fail; |
| } |
| } |
| |
| return 0; |
| fail: |
| av_freep(&ico->images); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| static int read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| IcoDemuxContext *ico = s->priv_data; |
| IcoImage *image; |
| AVIOContext *pb = s->pb; |
| AVStream *st; |
| int ret; |
| |
| if (ico->current_image >= ico->nb_images) |
| return AVERROR_EOF; |
| |
| st = s->streams[0]; |
| |
| image = &ico->images[ico->current_image]; |
| |
| if ((ret = avio_seek(pb, image->offset, SEEK_SET)) < 0) |
| return ret; |
| |
| if (s->streams[ico->current_image]->codecpar->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); |
| |
| if ((ret = avio_read(pb, buf, image->size)) != image->size) { |
| return ret < 0 ? ret : AVERROR_INVALIDDATA; |
| } |
| |
| st->codecpar->bits_per_coded_sample = AV_RL16(buf + 14); |
| |
| if (AV_RL32(buf + 32)) |
| image->nb_pal = AV_RL32(buf + 32); |
| |
| if (st->codecpar->bits_per_coded_sample <= 8 && !image->nb_pal) { |
| image->nb_pal = 1 << st->codecpar->bits_per_coded_sample; |
| AV_WL32(buf + 32, image->nb_pal); |
| } |
| |
| AV_WL32(buf - 4, 14 + 40 + image->nb_pal * 4); |
| AV_WL32(buf + 8, AV_RL32(buf + 8) / 2); |
| } |
| |
| pkt->stream_index = ico->current_image++; |
| pkt->flags |= AV_PKT_FLAG_KEY; |
| |
| return 0; |
| } |
| |
| static int ico_read_close(AVFormatContext * s) |
| { |
| IcoDemuxContext *ico = s->priv_data; |
| av_freep(&ico->images); |
| return 0; |
| } |
| |
| 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, |
| .read_close = ico_read_close, |
| .flags = AVFMT_NOTIMESTAMPS, |
| }; |