diff options
Diffstat (limited to 'libavformat/icodec.c')
-rw-r--r-- | libavformat/icodec.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/libavformat/icodec.c b/libavformat/icodec.c new file mode 100644 index 0000000000..f33fa1195b --- /dev/null +++ b/libavformat/icodec.c @@ -0,0 +1,222 @@ +/* + * 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(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); + + 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) + break; + + st = avformat_new_stream(s, NULL); + if (!st) + 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); + return AVERROR_INVALIDDATA; + } + ico->images[i].offset = avio_rl32(pb); + + 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->codecpar->codec_id = AV_CODEC_ID_PNG; + st->codecpar->width = 0; + st->codecpar->height = 0; + break; + case 40: + if (ico->images[i].size < 40) + return AVERROR_INVALIDDATA; + 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); + return AVERROR_INVALIDDATA; + } + } + + return 0; +} + +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_EOF; + + 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) { + av_packet_unref(pkt); + 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, +}; |