From 3b35f4ab51b8b720491ff5c9b4e86e2de8ebce07 Mon Sep 17 00:00:00 2001 From: Baptiste Coudurier Date: Tue, 20 May 2008 23:31:10 +0000 Subject: split swf de/muxer Originally committed as revision 13203 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavformat/swfdec.c | 206 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 206 insertions(+) create mode 100644 libavformat/swfdec.c (limited to 'libavformat/swfdec.c') diff --git a/libavformat/swfdec.c b/libavformat/swfdec.c new file mode 100644 index 0000000000..7f5a38f8b6 --- /dev/null +++ b/libavformat/swfdec.c @@ -0,0 +1,206 @@ +/* + * Flash Compatible Streaming Format + * Copyright (c) 2000 Fabrice Bellard. + * Copyright (c) 2003 Tinic Uro. + * + * 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 "swf.h" + +/*********************************************/ +/* Extract FLV encoded frame and MP3 from swf + Note that the detection of the real frame + is inaccurate at this point as it can be + quite tricky to determine, you almost certainly + will get a bad audio/video sync */ + +static int get_swf_tag(ByteIOContext *pb, int *len_ptr) +{ + int tag, len; + + if (url_feof(pb)) + return -1; + + tag = get_le16(pb); + len = tag & 0x3f; + tag = tag >> 6; + if (len == 0x3f) { + len = get_le32(pb); + } +// av_log(NULL, AV_LOG_DEBUG, "Tag: %d - Len: %d\n", tag, len); + *len_ptr = len; + return tag; +} + + +static int swf_probe(AVProbeData *p) +{ + /* check file header */ + if ((p->buf[0] == 'F' || p->buf[0] == 'C') && p->buf[1] == 'W' && + p->buf[2] == 'S') + return AVPROBE_SCORE_MAX; + else + return 0; +} + +static int swf_read_header(AVFormatContext *s, AVFormatParameters *ap) +{ + SWFContext *swf = s->priv_data; + ByteIOContext *pb = s->pb; + int nbits, len, tag; + + tag = get_be32(pb) & 0xffffff00; + + if (tag == MKBETAG('C', 'W', 'S', 0)) { + av_log(s, AV_LOG_ERROR, "Compressed SWF format not supported\n"); + return AVERROR(EIO); + } + if (tag != MKBETAG('F', 'W', 'S', 0)) + return AVERROR(EIO); + get_le32(pb); + /* skip rectangle size */ + nbits = get_byte(pb) >> 3; + len = (4 * nbits - 3 + 7) / 8; + url_fskip(pb, len); + swf->frame_rate = get_le16(pb); /* 8.8 fixed */ + get_le16(pb); /* frame count */ + + swf->samples_per_frame = 0; + s->ctx_flags |= AVFMTCTX_NOHEADER; + return 0; +} + +static int swf_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + SWFContext *swf = s->priv_data; + ByteIOContext *pb = s->pb; + AVStream *vst = NULL, *ast = NULL, *st = 0; + int tag, len, i, frame, v; + + for(;;) { + tag = get_swf_tag(pb, &len); + if (tag < 0) + return AVERROR(EIO); + if (tag == TAG_VIDEOSTREAM && !vst) { + int ch_id = get_le16(pb); + get_le16(pb); + get_le16(pb); + get_le16(pb); + get_byte(pb); + /* Check for FLV1 */ + vst = av_new_stream(s, ch_id); + if (!vst) + return -1; + vst->codec->codec_type = CODEC_TYPE_VIDEO; + vst->codec->codec_id = codec_get_id(swf_codec_tags, get_byte(pb)); + av_set_pts_info(vst, 64, 256, swf->frame_rate); + vst->codec->time_base = (AVRational){ 256, swf->frame_rate }; + len -= 10; + } else if ((tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) && !ast) { + /* streaming found */ + int sample_rate_code; + get_byte(pb); + v = get_byte(pb); + swf->samples_per_frame = get_le16(pb); + ast = av_new_stream(s, -1); /* -1 to avoid clash with video stream ch_id */ + if (!ast) + return -1; + swf->audio_stream_index = ast->index; + ast->codec->channels = 1 + (v&1); + ast->codec->codec_type = CODEC_TYPE_AUDIO; + ast->codec->codec_id = codec_get_id(swf_audio_codec_tags, (v>>4) & 15); + ast->need_parsing = AVSTREAM_PARSE_FULL; + sample_rate_code= (v>>2) & 3; + if (!sample_rate_code) + return AVERROR(EIO); + ast->codec->sample_rate = 11025 << (sample_rate_code-1); + av_set_pts_info(ast, 64, 1, ast->codec->sample_rate); + len -= 4; + } else if (tag == TAG_VIDEOFRAME) { + int ch_id = get_le16(pb); + len -= 2; + for(i=0; inb_streams; i++) { + st = s->streams[i]; + if (st->codec->codec_type == CODEC_TYPE_VIDEO && st->id == ch_id) { + frame = get_le16(pb); + av_get_packet(pb, pkt, len-2); + pkt->pts = frame; + pkt->stream_index = st->index; + return pkt->size; + } + } + } else if (tag == TAG_STREAMBLOCK) { + st = s->streams[swf->audio_stream_index]; + if (st->codec->codec_id == CODEC_ID_MP3) { + url_fskip(pb, 4); + av_get_packet(pb, pkt, len-4); + } else { // ADPCM, PCM + av_get_packet(pb, pkt, len); + } + pkt->stream_index = st->index; + return pkt->size; + } else if (tag == TAG_JPEG2) { + for (i=0; inb_streams; i++) { + st = s->streams[i]; + if (st->id == -2) + break; + } + if (i == s->nb_streams) { + vst = av_new_stream(s, -2); /* -2 to avoid clash with video stream and audio stream */ + if (!vst) + return -1; + vst->codec->codec_type = CODEC_TYPE_VIDEO; + vst->codec->codec_id = CODEC_ID_MJPEG; + av_set_pts_info(vst, 64, 256, swf->frame_rate); + vst->codec->time_base = (AVRational){ 256, swf->frame_rate }; + st = vst; + } + get_le16(pb); /* BITMAP_ID */ + av_new_packet(pkt, len-2); + get_buffer(pb, pkt->data, 4); + if (AV_RB32(pkt->data) == 0xffd8ffd9 || + AV_RB32(pkt->data) == 0xffd9ffd8) { + /* old SWF files containing SOI/EOI as data start */ + /* files created by swink have reversed tag */ + pkt->size -= 4; + get_buffer(pb, pkt->data, pkt->size); + } else { + get_buffer(pb, pkt->data + 4, pkt->size - 4); + } + pkt->stream_index = st->index; + return pkt->size; + } + url_fskip(pb, len); + } + return 0; +} + +static int swf_read_close(AVFormatContext *s) +{ + return 0; +} + +AVInputFormat swf_demuxer = { + "swf", + "Flash format", + sizeof(SWFContext), + swf_probe, + swf_read_header, + swf_read_packet, + swf_read_close, +}; -- cgit v1.2.3